CN110587789A - Segmental beam bottom die system - Google Patents
Segmental beam bottom die system Download PDFInfo
- Publication number
- CN110587789A CN110587789A CN201910709100.4A CN201910709100A CN110587789A CN 110587789 A CN110587789 A CN 110587789A CN 201910709100 A CN201910709100 A CN 201910709100A CN 110587789 A CN110587789 A CN 110587789A
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- China
- Prior art keywords
- support
- bottom die
- column
- elevating
- hinged
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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
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
-
- 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
- B28B7/22—Moulds for making units for prefabricated buildings, i.e. units each comprising an important section of at least two limiting planes of a room or space, e.g. cells; Moulds for making prefabricated stair units
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention relates to the field of section beams, in particular to a section beam bottom die system which comprises a fine adjustment seat, a basic support, an elevating support, an adjusting device and a bottom die, wherein the lower end of the basic support is provided with the fine adjustment seat which can adjust the position relative to the basic support; at least one elevating support is installed to basic support's upper end, and the die block is installed through adjusting device in the elevating support upper end of the top, and adjusting device is including being used for carrying out the hydraulic telescoping cylinder of angle fine setting and being used for carrying out the scalable regulation bracing piece of auxiliary stay to the die block. The invention has reasonable structural design, convenient application and control, stable regulation and control, high utilization rate of the bottom die and reduced cost, is not only suitable for prefabricating the large-span segmental beam with fixed height at the bottom of the beam body, but also suitable for constructing various segmental beams with special shapes.
Description
Technical Field
The invention relates to the field of section beams, in particular to a section beam bottom mould system.
Background
At present, in the construction and construction of a cross-river or cross-sea bridge, a large-span variable cross-section continuous beam is often adopted due to the advantages of good mechanical property, attractive appearance and the like. The height of the section of the large-span variable-section continuous beam changes along the longitudinal direction of the bridge, and the vertical height of the bottom of the beam body is in a parabola shape or an arc line shape along the longitudinal direction. The construction mode of prefabricating the short-line matching section beam has the advantages of short construction period on site, small influence on environment and existing traffic, small safety risk, reliable construction quality and the like, and is increasingly applied to the construction of the large-span variable-section continuous beam. In the construction of the short-line matched section beam, different sections of the same bridge are poured in the same template, and after the large-span variable-section continuous beam is divided into a plurality of sections, the height and the gradient of the bottom of the sections of the large-span variable-section continuous beam change section by section along the longitudinal direction of the bridge, so that the construction difficulty is high.
In the prior art, when a segmental beam bottom die of the large-span variable cross-section continuous beam is designed, the bottom die is usually designed independently according to the difference of the heights or the inclinations of the segments, so that the utilization rate of the bottom die is low, and the cost of the template is high. Therefore, in view of the above current situation, there is an urgent need to develop a segment beam bottom mold system which has a reasonable structural design, is convenient to apply and control, and can be stably regulated and controlled, so as to overcome the defects in the current practical application.
Disclosure of Invention
An object of an embodiment of the present invention is to provide a segmental beam bottom mold system to solve the problems in the background art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a segmental beam bottom die system comprises a fine adjustment seat, a foundation support, an elevating support, an adjusting device, a bottom die, a fixing bolt and a hinged support, wherein the fine adjustment seat capable of adjusting the position relative to the foundation support is arranged at the lower end of the foundation support; at least one elevating support is installed to foundation support's upper end, the top the die block is installed through adjusting device to elevating support upper end, adjusting device is including being used for carrying out the hydraulic telescoping cylinder of angle fine setting and being used for carrying out the scalable regulation bracing piece of auxiliary stay to the die block.
As a further scheme of the invention: the foundation support comprises two upright columns, a first connecting flange, a cross beam and an X beam, the fine adjustment seats are arranged at the lower ends of the two upright columns, and the upper ends of the two upright columns are fixedly provided with the first connecting flange which is used for being fixedly connected with the overhead support; and a cross beam and an X beam are also fixedly arranged between the two upright columns.
As a further scheme of the invention: the upper side and the lower side of the X beam are respectively provided with a cross beam, and the end parts of the cross beam and the X beam are welded and fixed with the upright post.
As a further scheme of the invention: the elevating bracket comprises a second connecting flange, two bracket beams, a third connecting flange and two pull beams, wherein the two ends of each pull beam are respectively fixedly provided with one bracket beam, the two bracket beams can vertically correspond to the two upright posts, the upper end and the lower end of each bracket beam are respectively fixedly provided with the second connecting flange and the third connecting flange, the second connecting flange and the third connecting flange are respectively provided with a plurality of screw holes, and the second connecting flange and the third connecting flange between the third connecting flange and the first connecting flange and between the two adjacent elevating brackets are fixedly connected through a fixing bolt.
As a further scheme of the invention: the adjusting device further comprises a supporting column, a fixing plate, inclined supporting plates and fastening bolts, wherein the supporting column and the hydraulic telescopic cylinder are respectively arranged at two ends of the bottom die, the upper end of the supporting column is fixedly connected with the bottom die through the disc-shaped fixing plate, and a plurality of inclined supporting plates are circumferentially distributed at the joint of the fixing plate and the supporting column; the upper end of the hydraulic telescopic cylinder is hinged with the bottom die; the lower ends of the support column and the hydraulic telescopic cylinder are respectively hinged with the hinged supports, and the lower ends of the two hinged supports are correspondingly fixed on the uppermost elevated support.
As a further scheme of the invention: scalable regulation bracing piece sets up in the one side that is close to the hydraulic telescoping cylinder, and the upper end and the die block of scalable regulation bracing piece are articulated to be connected, and the lower extreme of scalable regulation bracing piece is articulated with the straining beam of the overhead support of the top to be connected, and fastening bolt installs on scalable regulation bracing piece and is used for carrying out the locking after length adjustment to scalable regulation bracing piece fixed.
As a further scheme of the invention: the hinged support comprises a supporting seat, a supporting shaft, a mounting plate, an inserting column and a spring, the inserting column is fixedly mounted on the lower side of the mounting plate and is a prism, an inserting hole matched with the inserting column is formed in the elevating support, and the mounting plate is fixedly connected with a second connecting flange of the uppermost elevating support through a fixing bolt; the side-mounting of mounting panel is fixed with two supporting seats, strides between two supporting seats to establish and is fixed with the back shaft, and the lower extreme of support column and hydraulic telescoping cylinder corresponds to rotate and installs on the back shaft, the both sides of support column and hydraulic telescoping cylinder still are provided with the spring on the back shaft.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the section beam bottom mould system is arranged through the structure of the foundation support, and the foundation support is stable and reliable; through the structural arrangement of the elevating bracket, the cascade elevating is convenient to carry out, and the requirements of different working conditions are met; the bottom die can be subjected to fine adjustment of the inclination angle through the structural arrangement of the adjusting device, the reliability of connection between the support column and the bottom die can be improved through the fixed plate and the inclined support plate, the hydraulic telescopic cylinder is subjected to telescopic control, and then the telescopic adjusting support rod is locked through the fastening bolt, so that the reliable adjustment of the inclination angle of the bottom die can be realized, and the bottom die can be stably supported through the matched arrangement of the telescopic adjusting support rod and the hydraulic telescopic cylinder; through the structural setting of hinged-support, the plug post cartridge is on the jack of the overhead support of the top, further promotes the connection reliability, can be to support column and hydraulic telescoping cylinder elastic support through the spring, the front and back of adaptation die block slightly squints.
In conclusion, the section beam bottom die system is reasonable in structural design, convenient to apply and control, capable of being stably regulated and controlled, high in bottom die utilization rate and low in cost; the method is not only suitable for prefabricating the large-span section beam with the fixed height at the bottom of the beam body, but also suitable for constructing various special-shaped section beams (for example, the bottom surface of the section beam is a twisted surface, so that the special-shaped section beams with different front and back height differences at two sides of the beam body are constructed).
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural view illustrating bottom die angle adjustment according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of an elevated support in an embodiment of the present invention.
Fig. 4 is a schematic structural view of a hinge support in an embodiment of the present invention.
Fig. 5 is a schematic top view of a hinge support in an embodiment of the present invention.
In the figure: 1-fine adjustment seat, 2-base support, 21-upright post, 22-first connecting flange, 23-cross beam, 24-X beam, 3-elevated support, 31-second connecting flange, 32-support beam, 33-third connecting flange, 34-tension beam, 35-screw hole, 36-jack, 4-adjusting device, 41-support column, 42-fixing plate, 43-inclined support plate, 44-hydraulic telescopic cylinder, 45-telescopic adjusting support rod, 46-fastening bolt, 5-bottom die, 6-fixing bolt, 7-hinged support, 71-support seat, 72-support shaft, 73-mounting plate, 74-plug post and 75-spring.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
The embodiment is used for prefabricating the sections of the large-span variable-section continuous beam, the section height of the large-span variable-section continuous beam is changed along the longitudinal direction of the bridge, and the vertical height of the bottom of the beam body is in a parabola shape or an arc line shape along the longitudinal direction. The advantages of adopting segmental prefabrication compared with the traditional box girder mainly comprise:
1) the beam section is small in size and convenient to transport, and the transportation requirements of the section beam can be met on a common road;
2) the concrete shrinkage of the segmental beam is reduced, and the linear change of the beam body is small after completion;
3) the prefabricated production of the segment beam in factory is convenient for the control of production organization and integral construction quality; the segmental beam centralized prefabrication production is beneficial to protecting the surrounding ecological environment, so that the adverse effect caused by engineering reaches the minimum degree, and the construction difficulty is reduced, and meanwhile, the high safety of construction can be guaranteed.
It can be seen from fig. 1-2 that there is a slope between the longitudinal front and rear ends of the bottom mold 5 in this embodiment.
Referring to fig. 1-2, in the embodiment of the present invention, a segmental beam bottom die system includes a fine adjustment seat 1, a base support 2, an elevated support 3, an adjusting device 4, a bottom die 5, a fixing bolt 6 and a hinged support 7, where the fine adjustment seat 1 capable of performing position adjustment with respect to the base support 2 is installed at the lower end of the base support 2, and the fine adjustment seat 1 is finely adjusted to achieve overall levelness adjustment of the device; the upper end of the basic support 2 is provided with at least one elevated support 3, and the number of the elevated supports 3 can be increased or decreased according to the requirement so as to adapt to different working condition requirements; the die block 5 is installed through adjusting device 4 to the top of elevating support 3, adjusting device 4 is including being used for carrying out the hydraulic telescoping cylinder 44 of angle fine setting and being used for carrying out the scalable regulation bracing piece 45 of auxiliary stay to die block 5.
Example 2
Referring to fig. 3-5, the present embodiment is different from embodiment 1 in that:
in this embodiment, as shown in fig. 2, the base bracket 2 includes two columns 21, two first connecting flanges 22, two cross beams 23 and two X-beams 24, the fine adjustment seat 1 is installed at the lower ends of the two columns 21, and the first connecting flanges 22 for connecting and fixing with the elevated bracket 3 are installed and fixed at the upper ends of the two columns 21; a cross beam 23 and an X beam 24 are further installed and fixed between the two upright posts 21, specifically, the upper side and the lower side of the X beam 24 are respectively provided with one cross beam 23, and the end parts of the cross beam 23 and the X beam 24 are welded and fixed with the upright posts 21.
In this embodiment, as shown in fig. 2 and 3, the elevating bracket 3 includes a second connecting flange 31, a bracket beam 32, a third connecting flange 33 and a straining beam 34, two ends of the straining beam 34 are respectively and fixedly provided with one bracket beam 32, the two bracket beams 32 can vertically correspond to the two upright posts 21, upper and lower ends of the two bracket beams 32 are respectively and fixedly provided with the second connecting flange 31 and the third connecting flange 33, the second connecting flange 31 is used for being fixedly connected with the hinged support 7, the second connecting flange 31 and the third connecting flange 33 are both provided with a plurality of screw holes 35, the third connecting flange 33 and the first connecting flange 22 are fixedly connected through a fixing bolt 6, and the second connecting flange 31 and the third connecting flange 33 between two adjacent elevating brackets 3 are also fixedly connected through a fixing bolt 6.
In this embodiment, as shown in fig. 2, 4 and 5, the adjusting device 4 further includes a supporting column 41, a fixing plate 42, an inclined supporting plate 43 and a fastening bolt 46, the supporting column 41 and the hydraulic telescopic cylinder 44 are respectively disposed at two ends of the bottom die 5, the upper end of the supporting column 41 is connected and fixed with the bottom die 5 through the disc-shaped fixing plate 42, a plurality of inclined supporting plates 43 are circumferentially distributed at the joint of the fixing plate 42 and the supporting column 41, and the inclined supporting plates 43 play a role in assisting fixing; the upper end of the hydraulic telescopic cylinder 44 is hinged with the bottom die 5; the lower ends of the support column 41 and the hydraulic telescopic cylinder 44 are respectively hinged with the hinged supports 7, and the lower ends of the two hinged supports 7 are correspondingly fixed on the uppermost elevated support 3; scalable regulation bracing piece 45 sets up in the one side that is close to hydraulic telescoping cylinder 44, and scalable regulation bracing piece 45's upper end is connected with die block 5 is articulated, and scalable regulation bracing piece 45's lower extreme is connected with the straining beam 34 of the overhead support 3 of the top is articulated, fastening bolt 46 installs on scalable regulation bracing piece 45 and is used for carrying out the locking after length adjustment to scalable regulation bracing piece 45 fixed.
Further, the hinged support 7 includes a support base 71, a support shaft 72, a mounting plate 73, a plug column 74 and a spring 75, the plug column 74 is fixedly installed on the lower side of the mounting plate 73, the plug column 74 is a prism, a jack 36 matched with the plug column 74 is formed on the elevating support 3, as shown in fig. 3, the jack 36 is formed on each of the second connecting flange 31, the support beam 32 and the third connecting flange 33, and the mounting plate 73 is further fixedly connected with the second connecting flange 31 of the uppermost elevating support 3 through the fixing bolt 6; the upside installation of mounting panel 73 is fixed with two supporting seats 71, strides between two supporting seats 71 to establish and is fixed with the back shaft 72, and the lower extreme of support column 41 and hydraulic telescoping cylinder 44 corresponds to rotate and installs on back shaft 72, the both sides of support column 41 and hydraulic telescoping cylinder 44 still are provided with spring 75 on back shaft 72, can be to support column 41 and hydraulic telescoping cylinder 44 elastic support through spring 75, and the front and back of adaptation die block 5 slightly squints.
When the segmental beam bottom mould system is actually applied, the foundation support is stable and reliable through the structural arrangement of the foundation support 2; through the structural arrangement of the elevating bracket 3, the cascade elevating (only by using hoisting equipment) is convenient to carry out, and the requirements of different working conditions are met; through the structural arrangement of the adjusting device 4, the inclination angle of the bottom die 5 can be finely adjusted, the reliability of connection between the supporting column 41 and the bottom die 5 can be improved through the fixing plate 42 and the inclined supporting plate 43, the hydraulic telescopic cylinder 44 is subjected to telescopic control, and then the telescopic adjusting supporting rod 45 is locked through the fastening bolt 46, so that the reliable adjustment of the inclination angle of the bottom die 5 can be realized, and the bottom die 5 can be stably supported through the matched arrangement of the telescopic adjusting supporting rod 45 and the hydraulic telescopic cylinder 44; through the structural arrangement of the hinged support 7, the plug-in post 74 is inserted into the plug hole 36 of the uppermost elevated support 3, so that the connection reliability is further improved, and the support post 41 and the hydraulic telescopic cylinder 44 can be elastically supported through the spring 75 to adapt to slight front and back deviation of the bottom die 5.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several variations and modifications without departing from the concept of the present invention, and these should be considered as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (7)
1. A segmental beam bottom die system comprises a fine adjustment seat (1), a base support (2), an elevating support (3), an adjusting device (4), a bottom die (5), a fixing bolt (6) and a hinged support (7), and is characterized in that the fine adjustment seat (1) capable of adjusting the position relative to the base support (2) is installed at the lower end of the base support (2); at least one elevating support (3) is installed to the upper end of basic support (2), the top die (5) are installed through adjusting device (4) in elevating support (3) upper end, adjusting device (4) are including being used for carrying out hydraulic telescoping cylinder (44) of angle fine setting and being used for carrying out the scalable regulation bracing piece (45) of auxiliary stay to die block (5).
2. The segmental beam bottom formwork system according to claim 1, wherein the foundation support (2) comprises two upright columns (21), first connecting flanges (22), cross beams (23) and X-shaped beams (24), the fine adjustment seats (1) are arranged at the lower ends of the two upright columns (21), and the first connecting flanges (22) for connecting and fixing with the elevated support (3) are fixedly arranged at the upper ends of the two upright columns (21); and a cross beam (23) and an X beam (24) are also fixedly arranged between the two upright columns (21).
3. The segmental beam bottom mould system according to claim 2, characterized in that the upper and lower sides of the X-beam (24) are respectively provided with a cross beam (23), and the ends of the cross beam (23) and the X-beam (24) are welded and fixed with the upright column (21).
4. A segmental beam bottom mould system according to claim 2, characterised in that the elevated support (3) comprises second connection flanges (31), support beams (32), third connection flanges (33) and tie beams (34), two ends of the tension beam (34) are respectively and fixedly provided with a bracket beam (32), the two bracket beams (32) can vertically correspond to the two upright posts (21), the upper end and the lower end of the two bracket beams (32) are respectively and fixedly provided with a second connecting flange (31) and a third connecting flange (33), a plurality of screw holes (35) have all been seted up to second flange (31) and third flange (33), all connect fixedly through fixing bolt (6) between second flange (31) and the third flange (33) between third flange (33) and first flange (22), between two adjacent elevating brackets (3).
5. The segmental beam bottom die system according to claim 4, wherein the adjusting device (4) further comprises a support column (41), a fixing plate (42), a diagonal support plate (43) and a fastening bolt (46), the support column (41) and the hydraulic telescopic cylinder (44) are respectively arranged at two ends of the bottom die (5), the upper end of the support column (41) is fixedly connected with the bottom die (5) through the disc-shaped fixing plate (42), and a plurality of diagonal support plates (43) are circumferentially distributed at the joint of the fixing plate (42) and the support column (41); the upper end of the hydraulic telescopic cylinder (44) is hinged with the bottom die (5); the lower ends of the supporting columns (41) and the hydraulic telescopic cylinders (44) are respectively hinged with the hinged supports (7), and the lower ends of the two hinged supports (7) are correspondingly fixed on the uppermost elevating support (3).
6. The segmental beam bottom die system according to claim 5, wherein the telescopic adjusting support rod (45) is arranged on one side close to the hydraulic telescopic cylinder (44), the upper end of the telescopic adjusting support rod (45) is hinged to the bottom die (5), the lower end of the telescopic adjusting support rod (45) is hinged to the tie beam (34) of the uppermost elevated support (3), and the fastening bolt (46) is installed on the telescopic adjusting support rod (45) and used for locking and fixing the telescopic adjusting support rod (45) after length adjustment.
7. The segmental beam bottom die system according to claim 6, wherein the hinged support (7) comprises a support seat (71), a support shaft (72), a mounting plate (73), a plug-in column (74) and a spring (75), the plug-in column (74) is fixedly mounted on the lower side of the mounting plate (73), the plug-in column (74) is a prism, a jack (36) matched with the plug-in column (74) is formed in the elevating bracket (3), and the mounting plate (73) is further fixedly connected with the second connecting flange (31) of the uppermost elevating bracket (3) through a fixing bolt (6); the utility model discloses a hydraulic telescopic cylinder, including mounting panel (73), the upside installation of mounting panel (73) is fixed with two supporting seats (71), strides between two supporting seats (71) to establish and is fixed with back shaft (72), and the lower extreme of support column (41) and hydraulic telescopic cylinder (44) corresponds to rotate and installs on back shaft (72), the both sides of support column (41) and hydraulic telescopic cylinder (44) still are provided with spring (75) on back shaft (72).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910709100.4A CN110587789A (en) | 2019-08-01 | 2019-08-01 | Segmental beam bottom die system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910709100.4A CN110587789A (en) | 2019-08-01 | 2019-08-01 | Segmental beam bottom die system |
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| CN110587789A true CN110587789A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910709100.4A Pending CN110587789A (en) | 2019-08-01 | 2019-08-01 | Segmental beam bottom die system |
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| CN (1) | CN110587789A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112936519A (en) * | 2021-01-27 | 2021-06-11 | 中铁十六局集团有限公司 | Short line matching prefabricated U-shaped section beam template |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106079039A (en) * | 2016-06-13 | 2016-11-09 | 中交第二航务工程局有限公司 | A kind of large span, the superelevation distortion beam prefabricated steel template system of body matching box |
| CN207711012U (en) * | 2017-12-26 | 2018-08-10 | 湖南五新模板有限公司 | A kind of segment beam bottom board system |
-
2019
- 2019-08-01 CN CN201910709100.4A patent/CN110587789A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106079039A (en) * | 2016-06-13 | 2016-11-09 | 中交第二航务工程局有限公司 | A kind of large span, the superelevation distortion beam prefabricated steel template system of body matching box |
| CN207711012U (en) * | 2017-12-26 | 2018-08-10 | 湖南五新模板有限公司 | A kind of segment beam bottom board system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112936519A (en) * | 2021-01-27 | 2021-06-11 | 中铁十六局集团有限公司 | Short line matching prefabricated U-shaped section beam template |
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Application publication date: 20191220 |