CN111716490A - Stair die device with high control precision and capable of vibrating - Google Patents
Stair die device with high control precision and capable of vibrating Download PDFInfo
- Publication number
- CN111716490A CN111716490A CN202010533165.0A CN202010533165A CN111716490A CN 111716490 A CN111716490 A CN 111716490A CN 202010533165 A CN202010533165 A CN 202010533165A CN 111716490 A CN111716490 A CN 111716490A
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- plate
- bottom plate
- die
- stair
- back plate
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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
- B28B7/22—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
- B28B7/225—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 for making stairs or stair units comprising more than one step
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
- B28B1/087—Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention provides a stair mold device with high control precision and capable of vibrating, which comprises a horizontal bottom plate, a plurality of telescopic rods, a mold bottom plate and a mold main body, wherein the horizontal bottom plate is provided with a plurality of telescopic rods; the die bottom plate is parallel to the horizontal bottom plate, the die bottom plate is fixedly connected with the horizontal bottom plate through a telescopic rod, and a plurality of cylinder jacking devices are arranged between the die bottom plate and the horizontal bottom plate; the die main body comprises a back plate, a stepped plate and two side baffles, the back plate and the stepped plate are arranged side by side and are longitudinally vertical to the die bottom plate, the two side baffles are respectively positioned at the outer sides of the two ends of the back plate and the stepped plate and are detachably connected with the outer sides of the two ends of the back plate and the stepped plate, the bottom ends of the two side baffles are respectively detachably connected with the die bottom plate, and the back plate, the stepped plate, the two side baffles and the die bottom plate form a cavity with an upward opening; the mould main body also comprises a pressure sensor and a displacement sensor. The stair mold device provided by the invention enables the manufactured stair to have higher precision and higher quality, and is simple in structure and very wide in application prospect.
Description
Technical Field
The invention belongs to the field of design of assembled building molds, and particularly relates to a stair mold device which is high in control precision and capable of vibrating.
Background
Prefabricated staircase is as the important component part of prefabricated building, along with the country vigorously develops the prefabricated building trade, the use of prefabricated staircase mould will also be more and more frequent, and current staircase mould exists, and staircase mould control accuracy is lower, and product surface roughness is higher, the not high problem of product quality, how strengthen the control accuracy of staircase mould, the quality that improves the product becomes the key factor of staircase mould, consequently need a control accuracy height and can vibrate stair mould device urgent.
Disclosure of Invention
In order to solve the problems, the invention provides a stair die device which is high in control precision and capable of vibrating, and the technical scheme is as follows:
a stair mold device with high control precision and capable of vibrating comprises a horizontal bottom plate 1, a plurality of telescopic rods 2, a mold bottom plate 3 and a mold main body; the die bottom plate 3 is parallel to the horizontal bottom plate 1, the die bottom plate 3 is fixedly connected with the horizontal bottom plate 1 through the telescopic rod 2, and a plurality of cylinder jacking devices 4 are arranged between the die bottom plate 3 and the horizontal bottom plate 1; the die main body comprises a back plate 5, a stepped plate 6 and two side baffles 7, the back plate 5 and the stepped plate 6 are arranged side by side and are longitudinally vertical to the die bottom plate 3, the two side baffles 7 are respectively positioned at the outer sides of the two ends of the back plate 5 and the stepped plate 6 and are detachably connected with the outer sides of the two ends of the back plate and the stepped plate, the bottom ends of the two side baffles 7 are respectively detachably connected with the die bottom plate 3, and the back plate 5, the stepped plate 6, the two side baffles 7 and the die bottom plate 3 form a cavity 14 with an upward opening; the inboard both ends of backplate 5 are equipped with a plurality of pressure sensor 12, backplate 5 all is equipped with a plurality of displacement sensor 13 with the inboard both ends of notch cuttype plate 6, backplate 5 is equipped with a plurality of relative welding piece 8 to the parallel with the top of notch cuttype plate 6 in relative position, and each pair welding piece 8 is connected through I-shaped connecting rod 9, I-shaped connecting rod 9 is equipped with the screw thread regulation pole 10 that the phase-match used, I-shaped connecting rod 9 both ends can be dismantled with welding piece 8 through screw thread regulation pole 10 respectively and be connected.
Threaded holes matched with the threaded adjusting rods 10 are formed in the two ends of the I-shaped connecting rod 9, and the threaded adjusting rods 10 abut against the welding block 8 through the threaded holes. The step plate 6 and the back plate 5 can be prevented from being largely deformed when concrete is poured.
The two side baffles 7 are detachably connected with the outer sides of the two ends of the back plate 5 and the step plate 6 through a plurality of bolts and nuts 11 respectively. Namely, the two side baffles 7 and the outer sides of the two ends of the back plate 5, and the two side baffles 7 and the outer sides of the two ends of the stepped plate 6 are respectively connected through a plurality of bolts and nuts 11.
Preferably, the bolts and nuts 11 required by the baffle 7 on one side are 4 groups, and are respectively positioned on the upper part and the lower part of the connecting part of the baffle 7 with the back plate 5 and the step plate 6. Namely, the upper and lower portions of the connecting portion between baffle 7 and back plate 5, and the upper and lower portions of the connecting portion between baffle 7 and step plate 6.
The bottom end of the baffle 7 is detachably connected with the die bottom plate 3 through a plurality of bolts and nuts 11. Preferably, two sets of bolts and nuts 11 are needed for connecting the side baffle plate 7 with the mold bottom plate 3, and are respectively positioned at two ends of the bottom edge of the side baffle plate 7.
Preferably, the number of the pressure sensors 12 is 4, and the pressure sensors are respectively positioned at the upper part and the lower part of the two ends of the inner side of the back plate 5.
Preferably, the number of the displacement sensors 13 is 4, wherein 2 of the displacement sensors 13 are respectively located at two ends of the inner side of the back plate, and the other 2 of the displacement sensors 13 are respectively located at two ends of the inner side of the step plate.
And the welding block 8 is fixedly connected with the top ends of the back plate 5 and the step plate 6. Preferably, the welding block 8 is welded with the back plate 5 and the top end of the step plate 6.
Preferably, the welding blocks 8 have 3 pairs.
The cylinder jacking device 4 comprises 2 cylinders and cylinder jacking discs. Is a common cylinder jacking device.
The number of the telescopic rods 2 is 4.
When in use, the horizontal bottom plate 1 is fixed on the ground, and the invention is assembled according to the connection mode. When concrete is poured into the cavity 14 of the mold device, the pressure sensor 12 at the lower part in the cavity 14 detects pressure, and the cylinder jacking device 4 starts to operate quickly, so that the mold is vibrated integrally, and the problems that when the concrete is poured into the mold device, the concrete is not uniformly distributed in the mold of the stair, and the quality of the stair is poor due to bubbles can be solved; when the poured concrete reaches a certain height, the pressure sensor 12 at the upper part in the cavity 14 senses pressure information, and the cylinder jacking device 4 stops moving at the moment, so that the vibration of the mold device is automatically controlled; the I-shaped connecting rod 9 and the thread adjusting rod 10 can prevent the die device from generating large deformation when concrete is poured, and when small deformation is generated, the deformation is detected through the displacement sensor 13, and then the deformation is eliminated through adjusting the thread adjusting rod 10, so that the stair manufacturing is guaranteed to have high precision, and meanwhile, the stair manufactured is guaranteed to have high quality conveniently and quickly. And (5) after the concrete pouring is finished, maintaining for a period of time, and dismantling the die.
Compared with the prior art, the invention has the following beneficial effects:
compared with other stair molds, the mold device provided by the invention constantly detects the displacement change of the mold through the displacement sensor in the mold device, and the I-shaped connecting rod and the thread adjusting rod at the top end of the mold device not only ensure that the mold does not generate larger deformation, but also ensure that smaller deformation can be eliminated through the displacement sensor and the thread adjusting rod when smaller deformation is generated; through the inside pressure sensor of mould, the cylinder jacking device of bottom, when making concrete just pour, the mould produces the vibration in order to eliminate the inhomogeneous condition of concrete distribution in the stair mould, and when reacing the take the altitude, the automatic shutdown vibration can guarantee that the stair of making out have higher precision. Therefore, the stair has higher precision and higher quality. The invention has simple structure and wide application prospect.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a perspective view of the present invention;
FIG. 3 is a partial view of the present invention;
reference numerals: the method comprises the following steps of 1-horizontal bottom plate, 2-telescopic rod, 3-die bottom plate, 4-cylinder jacking device, 5-back plate, 6-step plate, 7-baffle plate, 8-welding block, 9-I-shaped connecting rod, 10-thread adjusting rod, 11-bolt nut, 12-pressure sensor, 13-displacement sensor and 14-chamber.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1-2, a stair mold device with high control precision and capable of vibrating comprises a horizontal bottom plate 1, a plurality of telescopic rods 2, a mold bottom plate 3 and a mold main body; the die bottom plate 3 is parallel to the horizontal bottom plate 1, the die bottom plate 3 is fixedly connected with the horizontal bottom plate 1 through the telescopic rod 2, and a plurality of cylinder jacking devices 4 are arranged between the die bottom plate 3 and the horizontal bottom plate 1; the die main body comprises a back plate 5, a stepped plate 6 and two side baffles 7, the back plate 5 and the stepped plate 6 are arranged side by side and are longitudinally vertical to the die bottom plate 3, the two side baffles 7 are respectively positioned at the outer sides of the two ends of the back plate 5 and the stepped plate 6 and are detachably connected with the outer sides of the two ends of the back plate and the stepped plate, the bottom ends of the two side baffles 7 are respectively detachably connected with the die bottom plate 3, and the back plate 5, the stepped plate 6, the two side baffles 7 and the die bottom plate 3 form a cavity 14 with an upward opening; the inboard both ends of backplate 5 are equipped with a plurality of pressure sensor 12, backplate 5 all is equipped with a plurality of displacement sensor 13 with the inboard both ends of notch cuttype plate 6, backplate 5 is equipped with a plurality of relative welding piece 8 to the parallel with the top of notch cuttype plate 6 in relative position, and each pair welding piece 8 is connected through I-shaped connecting rod 9, I-shaped connecting rod 9 is equipped with the screw thread regulation pole 10 that the phase-match used, I-shaped connecting rod 9 both ends can be dismantled with welding piece 8 through screw thread regulation pole 10 respectively and be connected.
I-shaped connecting rod 9 and screw thread adjusting rod 10 cooperate and use, 9 both ends of I-shaped connecting rod be equipped with screw thread adjusting rod 10 assorted screw hole, screw thread adjusting rod 10 supports on welding block 8 through the screw hole, can prevent when concreting, and notch cuttle 6 and backplate 5 produce great deformation.
The two side baffles 7 are detachably connected with the outer sides of the two ends of the back plate 5 and the outer sides of the two ends of the two side baffles 7 and the outer sides of the two ends of the stepped plate 6 through a plurality of bolt nuts 11 respectively. Preferably, the bolts and nuts 11 required by the baffle 7 on one side are 4 groups, and are respectively positioned on the upper part and the lower part of the connecting part of the baffle 7 and the back plate 5 and on the upper part and the lower part of the connecting part of the baffle 7 and the step plate 6.
The bottom end of the baffle 7 is detachably connected with the die bottom plate 3 through a plurality of bolts and nuts 11. Preferably, two sets of bolts and nuts 11 are required for connecting the side baffle plate 7 with the mold bottom plate 3, and are respectively positioned at two ends of the bottom edge of the side baffle plate 7.
As shown in fig. 3, which is a partial schematic view of the device of the present invention after removing one side baffle 7, preferably, there are 4 pressure sensors 12 respectively located at the upper and lower portions of the inner ends of the back plate 5.
Preferably, the number of the displacement sensors 13 is 4, wherein 2 of the displacement sensors 13 are respectively located at two ends of the inner side of the back plate, and the other 2 of the displacement sensors 13 are respectively located at two ends of the inner side of the step plate.
And the welding block 8 is fixedly connected with the top ends of the back plate 5 and the step plate 6. Preferably, the welding block 8 is welded with the back plate 5 and the top end of the step plate 6.
Preferably, the welding blocks 8 have 3 pairs.
The cylinder jacking device 4 comprises 2 cylinders and cylinder jacking discs. Is a common cylinder jacking device.
The number of the telescopic rods 2 is 4.
In the invention, the horizontal bottom plate 1 is fixed on the ground and is a foundation for positioning the whole die device, and the telescopic rod 2 can move along the vertical direction and has the functions of positioning and supporting; the I-shaped connecting rods 9 and the thread adjusting rods 10 at the top ends of the stepped plate 6 and the back plate 5 can prevent the die device from generating large deformation when concrete is poured, and when small deformation is generated, the deformation is detected by the displacement sensor 13, and then the deformation is eliminated by adjusting the thread adjusting rods 10, so that the high precision of manufacturing the stairs is ensured; be provided with cylinder jacking device 4 between mould bottom plate 3 and horizontal bottom plate 1, be provided with pressure sensor 12 in mould device inside, when just beginning to pour the concrete, make the stair mould take place to vibrate through cylinder jacking device 4 to eliminate the inhomogeneous condition that leads to the stair quality to descend that distributes in mould device of concreting, when concreting reaches certain height, mould device stops vibrating, can realize automated control, and is convenient laborsaving.
When in use, the horizontal bottom plate 1 is fixed on the ground, and the invention is assembled according to the connection mode. When concrete is poured into the cavity 14 of the mold device, the pressure sensor 12 at the lower part in the cavity 14 detects pressure, and the cylinder jacking device 4 starts to operate quickly, so that the mold is vibrated integrally, and the problems that when the concrete is poured into the mold device, the concrete is not uniformly distributed in the mold of the stair, and the quality of the stair is poor due to bubbles can be solved; when the poured concrete reaches a certain height, the pressure sensor 12 at the upper part in the cavity 14 senses pressure information, and the cylinder jacking device 4 stops moving at the moment, so that the vibration of the mold device is automatically controlled; the I-shaped connecting rod 9 and the thread adjusting rod 10 can prevent the die device from generating large deformation when concrete is poured, and when small deformation is generated, the deformation is detected through the displacement sensor 13, and then the deformation is eliminated through adjusting the thread adjusting rod 10, so that the stair is guaranteed to be manufactured with high precision, and the manufactured stair is guaranteed to have high quality conveniently and quickly. And (5) after the concrete pouring is finished, maintaining for a period of time, and dismantling the die.
The stair has the advantages that the manufacturing cost is controlled, the convenience in disassembly and assembly is guaranteed, the manufacturing precision is high, the displacement sensor 13, the pressure sensor 12, the cylinder jacking device 4, the telescopic rod 2, the I-shaped connecting rod 9 and the threaded adjusting rod 10 are improved, the yield of stair manufacturing is greatly improved, and the stair quality is improved. The bolt and the nut are used for detachable connection, so that the price is low, and the cost is reduced.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The utility model provides a stair mould device that control accuracy is high and can vibrate which characterized in that: comprises a horizontal bottom plate (1), a plurality of telescopic rods (2), a mould bottom plate (3) and a mould main body; the die bottom plate (3) is parallel to the horizontal bottom plate (1), the die bottom plate (3) is fixedly connected with the horizontal bottom plate (1) through a telescopic rod (2), and a plurality of cylinder jacking devices (4) are arranged between the die bottom plate (3) and the horizontal bottom plate (1); the die main body comprises a back plate (5), a step plate (6) and two side baffles (7), the back plate (5) and the step plate (6) are arranged side by side and are vertically perpendicular to the die bottom plate (3), the two side baffles (7) are respectively positioned at the outer sides of the two ends of the back plate (5) and the step plate (6) and are detachably connected with the outer sides of the two ends of the back plate and the step plate, the bottom ends of the two side baffles (7) are respectively detachably connected with the die bottom plate (3), and the back plate (5), the step plate (6), the two side baffles (7) and the die bottom plate (3) form a cavity (14) with an upward opening; the inboard both ends of backplate (5) are equipped with a plurality of pressure sensor (12), backplate (5) all are equipped with a plurality of displacement sensor (13) with the inboard both ends of ladder board (6), backplate (5) are equipped with a plurality of relative welding piece (8) to the parallel with the top of ladder board (6) in relative position, and each is connected through I-shaped connecting rod (9) to welding piece (8), I-shaped connecting rod (9) are equipped with screw thread adjusting rod (10) that the phase-match used, I-shaped connecting rod (9) both ends can be dismantled with welding piece (8) through screw thread adjusting rod (10) respectively and be connected.
2. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: the double-threaded-rod-type welding machine is characterized in that threaded holes matched with the threaded adjusting rods (10) are formed in the two ends of the I-shaped connecting rod (9), and the threaded adjusting rods (10) are abutted to the welding blocks (8) through the threaded holes.
3. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: the baffle plates (7) at the two sides are detachably connected with the back plate (5) and the outer sides of the two ends of the step plate (6) through a plurality of bolts and nuts (11).
4. A high control accuracy and vibratable stair die apparatus as claimed in claim 3, wherein: and 4 groups of bolts and nuts (11) required by the baffle (7) are arranged on one side and are respectively positioned on the upper part and the lower part of the connecting part of the baffle (7) with the back plate (5) and the step plate (6).
5. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: the bottom end of the baffle (7) is detachably connected with the die bottom plate (3) through a plurality of bolts and nuts (11).
6. A stair mold device with high control precision and capable of vibrating according to claim 5, wherein: the two groups of bolts and nuts (11) are respectively positioned at two ends of the bottom edge of the baffle plate (7).
7. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: the number of the pressure sensors (12) is 4, and the pressure sensors are respectively positioned at the upper part and the lower part of the two ends of the inner side of the back plate (5).
8. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: the displacement sensors (13) are 4, wherein 2 displacement sensors (13) are respectively positioned at two ends of the inner side of the back plate, and the other 2 displacement sensors (13) are respectively positioned at two ends of the inner side of the step plate.
9. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: welding piece (8) and backplate (5) and step plate (6) top fixed connection, welding piece (8) have 3 pairs.
10. The stair mold device with high control precision and capable of vibrating according to claim 1, wherein: the number of the telescopic rods (2) is 4, and the number of the cylinder jacking devices (4) is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010533165.0A CN111716490A (en) | 2020-06-12 | 2020-06-12 | Stair die device with high control precision and capable of vibrating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010533165.0A CN111716490A (en) | 2020-06-12 | 2020-06-12 | Stair die device with high control precision and capable of vibrating |
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| Publication Number | Publication Date |
|---|---|
| CN111716490A true CN111716490A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010533165.0A Pending CN111716490A (en) | 2020-06-12 | 2020-06-12 | Stair die device with high control precision and capable of vibrating |
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| CN (1) | CN111716490A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193922A (en) * | 1986-08-15 | 1988-02-24 | Bison Limited | Moulding concrete staircases |
| CN204844465U (en) * | 2015-07-22 | 2015-12-09 | 湖南中铁五新钢模有限责任公司 | Automatic control system of adjustment curve radius's flexible prestressed concrete beam template |
| CN106092036A (en) * | 2016-06-03 | 2016-11-09 | 北京工业职业技术学院 | A kind of formwork-support deformation remote real time monitoring system and method |
| CN106378861A (en) * | 2016-11-08 | 2017-02-08 | 安徽宇辉建筑产业现代化设计研究院有限公司 | Prefabricated type concrete stair mould and stair manufacturing method |
| CN207616848U (en) * | 2017-08-29 | 2018-07-17 | 北京四汇建筑工程有限责任公司 | Precast stair mold |
| CN207711015U (en) * | 2017-11-09 | 2018-08-10 | 广州市世博建筑工程有限公司 | A kind of steel construction precast stair production mould |
| CN207863469U (en) * | 2017-08-30 | 2018-09-14 | 中民筑友科技投资有限公司 | A kind of stringer type stairway mold |
| CN207959929U (en) * | 2018-03-05 | 2018-10-12 | 沭阳县亚威木业有限公司 | A kind of gang form with pressure compensation |
| CN108818894A (en) * | 2018-08-03 | 2018-11-16 | 上海住信住宅工业有限公司 | A kind of precast stair mold |
| CN108999398A (en) * | 2018-06-29 | 2018-12-14 | 浙江展诚建设集团股份有限公司 | The Formwork Installation Method of steel and concrete composite structure beam |
| CN110757629A (en) * | 2019-11-22 | 2020-02-07 | 江苏开放大学（江苏城市职业学院） | Quality-controllable assembled stair mold and stair manufacturing method |
-
2020
- 2020-06-12 CN CN202010533165.0A patent/CN111716490A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2193922A (en) * | 1986-08-15 | 1988-02-24 | Bison Limited | Moulding concrete staircases |
| CN204844465U (en) * | 2015-07-22 | 2015-12-09 | 湖南中铁五新钢模有限责任公司 | Automatic control system of adjustment curve radius's flexible prestressed concrete beam template |
| CN106092036A (en) * | 2016-06-03 | 2016-11-09 | 北京工业职业技术学院 | A kind of formwork-support deformation remote real time monitoring system and method |
| CN106378861A (en) * | 2016-11-08 | 2017-02-08 | 安徽宇辉建筑产业现代化设计研究院有限公司 | Prefabricated type concrete stair mould and stair manufacturing method |
| CN207616848U (en) * | 2017-08-29 | 2018-07-17 | 北京四汇建筑工程有限责任公司 | Precast stair mold |
| CN207863469U (en) * | 2017-08-30 | 2018-09-14 | 中民筑友科技投资有限公司 | A kind of stringer type stairway mold |
| CN207711015U (en) * | 2017-11-09 | 2018-08-10 | 广州市世博建筑工程有限公司 | A kind of steel construction precast stair production mould |
| CN207959929U (en) * | 2018-03-05 | 2018-10-12 | 沭阳县亚威木业有限公司 | A kind of gang form with pressure compensation |
| CN108999398A (en) * | 2018-06-29 | 2018-12-14 | 浙江展诚建设集团股份有限公司 | The Formwork Installation Method of steel and concrete composite structure beam |
| CN108818894A (en) * | 2018-08-03 | 2018-11-16 | 上海住信住宅工业有限公司 | A kind of precast stair mold |
| CN110757629A (en) * | 2019-11-22 | 2020-02-07 | 江苏开放大学（江苏城市职业学院） | Quality-controllable assembled stair mold and stair manufacturing method |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20200929 |