CN211114418U - Main material damage-free detachable steel-concrete combined beam - Google Patents
Main material damage-free detachable steel-concrete combined beam Download PDFInfo
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- CN211114418U CN211114418U CN201921608263.5U CN201921608263U CN211114418U CN 211114418 U CN211114418 U CN 211114418U CN 201921608263 U CN201921608263 U CN 201921608263U CN 211114418 U CN211114418 U CN 211114418U
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Abstract
The utility model discloses a main material damage-free detachable steel-concrete composite beam, which mainly comprises an I-shaped steel beam, a prefabricated reinforced concrete plate, a shearing-resistant bolt sleeve set, an insert block and a steel cover plate. Holes are preset at the symmetrical positions of the left side and the right side of the upper flange of the I-shaped steel beam; the prefabricated reinforced concrete slab is internally distributed with reinforcing steel bars, an insert block placing preformed hole is reserved at the corresponding position of the bolt, the preformed hole consists of semicircular platforms at two sides and a quadrangular prism at the middle, the shape of the insert block is the same as that of the preformed hole, the insert block is completely attached to the wall of the preformed hole after being placed, and the concrete slab is connected with the steel beam through the bolt; the shear bolt sleeve set consists of a stud, a nut and a gasket. The utility model discloses the component adopts can dismantle bolted connection and replace the stud welding, and through weakening the screw cross-section, can improve the failure mode of combination beam, avoids the damage of two kinds of main materials of girder steel and concrete slab, guarantees construction quality, improves the availability factor, and the main material of being convenient for is retrieved and used repeatedly.
Description
Technical Field
The utility model relates to a removable steel-concrete composite beam especially relates to a removable steel-concrete composite beam that main material exempted from damage, belongs to the building engineering field.
Background
The steel-concrete composite beam is a member which connects a steel beam and a concrete slab into a whole through a shear connector, wherein the shear connector is one of key stress members in the steel-concrete composite beam, so that the composite structure can fully exert the advantages of good tensile property of steel and high compressive strength of concrete. The shear connection of the steel-concrete composite beam structure adopts the welding stud connection, the construction quality is poor, the cost is high, the disassembly is difficult, and the fatigue problem of the welding part at the root part is more prominent.
At present, China is in a large-scale urbanization construction stage, and construction waste generated by engineering demolition is an important problem of environmental protection and sustainable development, so that the structure has full-life-cycle detachability, and has a wide application prospect. In recent years, bolted shear connectors have replaced welded studs as shear connectors in some composite beam members. The bolt shear connector consists of a nut, a screw rod, threads, nuts and a gasket, wherein the screw rod penetrates through a hole preset in the flange of the steel beam and is fastened on the flange of the steel beam through an upper nut and a lower nut, and the gasket is arranged between the lower surface of the flange of the steel beam and the nuts. Compare in welding stud shear force connecting piece, use nut connection pin pole and girder steel, construction convenient operation, connection quality is stable. Compared with a welding mode, the installation of the bolt connection can save more manpower, material resources and construction time, and reduce the cost related to welding. Meanwhile, the combination beam has the characteristic of being detachable due to the fact that the bolts are connected and matched with the precast concrete plates, and later-stage maintenance and recycling are facilitated.
Chinese patent CN103590322A discloses a shear connector, a composite beam containing the same and a construction method, which has the structural principle that a steel plate is arranged between a concrete slab and a steel beam, and the concrete slab, the steel plate and the steel beam are connected by a bolt shear connector, although the structure can enhance the pretensioning effect of the bolt shear connector, the structure can damage the steel beam and the concrete slab, which is not beneficial to disassembly and recycling of main material components, the flange holes of the bolt and the steel beam are provided with pores, and the relative positions of the bolt and the steel beam are dislocated, thereby causing the rigidity reduction of the bolt shear connector, and having the defects of inaccurate prediction of rigidity and ultimate shear bearing capacity, poor ductility and the like.
Chinese patent CN108193588A discloses a fabricated steel-concrete combination beam shear key, which is constructed by adding steel filler plates on the upper and lower sides of the upper flange of a steel beam, fastening the upper and lower steel filler plates with the upper flange of the steel beam by high-strength bolts and nuts, reserving a secondary pouring reserved hole on a precast concrete plate, placing the precast concrete plate on the upper side of the steel beam in place, and using UHPC to pour the reserved hole to connect the precast concrete plate and the steel beam into a whole through a bolt shear connector, wherein the structure can improve the integrity of the combination beam and the shear performance and the pre-tension effect of the shear connector, but the precast concrete plate, the steel beam and the bolt shear connector are connected into a whole through a wet connection method and can be used only after the UHPC of the secondary pouring reaches the bearing strength, the bolt shear connector can damage the steel beam and the concrete plate, and is not beneficial to the disassembly and the recycling of main material components, and has the defects of incapability of accurately predicting rigidity and ultimate shear bearing capacity, poor ductility and the like.
In summary, when the bolted shear connector is used as a shear connector of a detachable assembled composite beam, the following problems often exist: (1) the bolt is usually made of high-strength steel, the strength of the bolt is greater than that of a steel beam, in practical application, the steel beam and a concrete slab are easily damaged, later-stage disassembly is not facilitated, recycling of the steel beam and the concrete slab is also not facilitated, the bolt is brittle in material, low in ductility and small in elongation, and the bolt is small in deformation capacity when being used as a shear connecting piece; (2) at present, a precast concrete slab with a preformed hole is adopted to connect a steel beam and a bolt shear connector into a whole by a wet connection method, the composite beam can be used only after the filler of the preformed hole reaches the strength, and the requirement of an assembled structure for quick assembly and quick use cannot be met; (3) when the bolt shear connecting piece is in a failure mode of screw shearing, the shearing section of the screw is usually positioned at the joint surface of the bottom surface of a concrete slab and the top surface of the flange of the steel beam, the ring surface of the screw is provided with threads, the section of the screw deforms too much or deforms too much due to local bearing failure on the flange screw hole of the steel beam, the construction difficulty of later-stage disassembly work can be increased, and the recycling of components is not facilitated; (4) when the joint surface of a concrete slab and a steel beam is damaged, the stress of bolts, preformed hole pouring materials and the steel beam around the damaged position is complex before the damage, a theoretical formula for accurately solving the ultimate shear-resistant bearing capacity and the shear-resistant rigidity is difficult to derive, the accurate bearing design of the structure at the early stage is not facilitated, and the material waste is caused; (5) traditional bolt is as shear force connecting piece, and the trompil that the girder steel flange was predetermine often leaves the hole with the bolt, and girder steel and bolt can produce relative dislocation, reduce bolt shear force connecting piece's rigidity.
Disclosure of Invention
The utility model aims to overcome the shortcoming of prior art, provide a can dismantle, main material not damaged, shear rigidity adjustable and the better main material of ductility exempts from removable steel-concrete composite beam of damage.
The technical scheme of the utility model as follows:
the utility model discloses a main material damage-free detachable steel-concrete composite beam, which comprises an I-shaped steel beam arranged along the horizontal direction, a precast concrete plate is supported and arranged on the upper flange of the I-shaped steel beam, a plurality of preformed holes are arranged on the precast concrete plate at intervals from front to back, an insert block matched with the shape of the preformed hole is arranged in each preformed hole, the top surface of the insert block is lower than the top surface of the preformed hole, the bottom surface of the insert block is higher than the bottom surface of the preformed hole, two screw connecting holes are arranged on each insert block at intervals from left to right, a steel beam connecting hole is arranged on the I-shaped steel beam corresponding to each screw connecting hole, the upper part of each steel beam connecting hole is a conical hole, the lower part of each steel beam connecting hole is a circular hole with the same diameter as the bottom end of the conical hole, the top of the conical hole is a diameter big end, a conical nut is arranged in the conical hole on the upper part of each steel beam connecting hole, the lower part of the conical nut is matched with the shape of the conical hole, and the top wall of the conical nut is exposed out of the top wall of the upper flange of the I-shaped steel beam;
each screw connecting hole is inserted with a double-end stud, and the double-end stud comprises an upper threaded rod section, a smooth rod section and a lower threaded rod section which are sequentially connected from top to bottom; the lower threaded rod section of the stud sequentially penetrates through a cone nut, a steel beam connecting hole, a lower gasket and a lower nut which are correspondingly arranged on the I-shaped steel beam, the cone nut is in threaded connection with the stud, and the lower gasket is fixed on the bottom wall of the lower flange of the I-shaped steel beam by screwing the lower nut; and the conical nut is tightly fixed on the wall of the conical hole of the I-shaped steel beam in a fitting manner by screwing the lower nut; the upper part of the stud is sleeved with an upper gasket and is in threaded connection with an upper nut, and the upper gasket is fixed on the top wall of the insert block by screwing the upper nut; the upper threaded rod section and the smooth rod section of the stud are arranged in the screw connecting hole of the insert block; and a steel cover plate supported on the stud is arranged in each preformed hole, the steel cover plate is fixed with the precast concrete plate, and the upper surface of the steel cover plate is flush with the upper surface of the precast concrete plate.
The utility model discloses have following advantage and outstanding effect for prior art:
1. the girder steel passes through bolted connection with precast concrete board, has overcome stud welded welding quality and welding technical problem, and the equipment of being convenient for is dismantled, can improve the availability factor to be favorable to the recovery and the used repeatedly of main material, accord with green development theory.
2. The cross section of the screw is weakened, and the damage position is intentionally induced to be transferred to the upper weakening position, so that the screw is firstly subjected to plastic yielding at the weakened part, the main material is protected from being damaged, and the unfavorable damage mode of shearing damage of the contact surface of a concrete slab and a steel beam flange or local bearing damage of the steel beam flange can be effectively avoided. By adjusting the weakening degree of the cross section of the screw, the design shear bearing capacity and shear rigidity of the bolt shear connecting piece can be quantitatively designed, and the ductility and the deformability of the bolt shear connecting piece are improved.
3. The shearing rigidity and the shearing bearing capacity of the shear connector are adjusted by changing the distance between the lower surface of the high-strength mortar insert block and the upper surface of the flange of the steel beam, so that design and calculation are facilitated, and different construction requirements can be met.
4. The trompil of predetermineeing than traditional bolt shear connector girder steel has the hole for straight bolt hole and with the bolt, causes the decline of bolt shear connector rigidity, the utility model discloses use cone nut, in the toper screw that the cone nut embedding girder steel was reserved, make bolt shear connector and girder steel relative position not take place the dislocation, avoided because the bolt shear connector rigidity loss that the relative dislocation of bolt caused.
5. Compare the wet connection method of traditional precast concrete board and girder steel and bolt shear force connecting piece that leave the preformed hole through cast-in-place preformed hole, have need wait to possess the shortcoming that just can drop into use after the cast-in-place preformed hole material possesses bearing strength, the utility model discloses each component is the finished product of mill's preparation, uses dry connection method, realizes assembling the completion and can drop into use, is applicable to road and architectural facilities etc. under emergency situation such as emergency rescue and disaster relief.
Drawings
FIG. 1 is a schematic structural view of a shear bolt sleeve set in a main material damage-free detachable steel-concrete composite beam of the present invention;
FIG. 2 is a schematic view of the structure of the insert block in the main material damage-free detachable steel-concrete composite beam of the present invention;
FIG. 3 is a structural diagram of a bolt shear connector in the main material damage-free detachable steel-concrete composite beam of the present invention;
FIG. 4 is a schematic diagram of feature sizes in the structure shown in FIG. 3;
FIG. 5 is a schematic structural view of the main material damage-free detachable steel-concrete composite beam of the present invention;
fig. 6 is a schematic diagram of the structure of the preformed hole in the main material damage-free detachable steel-concrete composite beam of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific mounting methods.
As shown in the attached drawings, the utility model discloses a main material damage-free detachable steel-concrete composite beam, including the I-shaped steel beam 10 that sets up along the horizontal direction, support on the upper wing edge 7 of I-shaped steel beam 10 and be provided with precast concrete board 8, on precast concrete board 8 around at intervals open have a plurality of preformed holes, install an inserted block 6 that matches with the preformed hole shape in every preformed hole, the top surface of inserted block 6 be less than the top surface of preformed hole, the bottom surface of inserted block 6 be higher than the bottom surface of preformed hole, the interval has two screw connecting holes 6-4, 6-5 about on every inserted block 6, all open a girder steel connecting hole on the I-shaped steel beam 10 of the position corresponding with every screw connecting hole, the upper portion of every girder steel connecting hole be the bell mouth and the lower part be the circular port that is the same with bell mouth bottom diameter, the top of the conical hole is a large-diameter end, a conical nut 4-2 is installed in the conical hole at the upper part of each steel beam connecting hole, the lower part of the conical nut 4-2 is matched with the shape of the conical hole, and the top wall of the conical nut 4-2 is exposed out of the top wall of the upper flange 7 of the I-shaped steel beam 10.
Each screw connecting hole is inserted with a stud, the lower part of the stud sequentially passes through a conical nut 4-2, a steel beam connecting hole, a lower gasket 5-2 and a lower nut 4-3 which are correspondingly arranged on an I-shaped steel beam 10, and the stud comprises an upper threaded rod section 1, a smooth rod section 2 and a lower threaded rod section 3 which are sequentially connected from top to bottom.
The cone nut 4-2 is in threaded connection with the stud, and the lower gasket 5-2 is fixed on the bottom wall of the lower flange of the I-shaped steel beam 10 by screwing the lower nut 4-3. And the lower nut 4-3 is screwed so that the conical nut 4-2 is tightly fixed on the wall of the smooth conical hole of the upper flange 7 of the I-shaped steel beam 10. The upper part of the stud is sleeved with an upper gasket 5-1 and is in threaded connection with an upper nut 4-1, and the upper gasket 5-1 is fixed on the top wall of the insert block 6 by screwing the upper nut 4-1. As shown in fig. 5, the upper threaded rod section 1 and the smooth rod section 2 of the stud are adapted to be disposed in the screw connecting hole of the insert 6. And a steel cover plate 11 supported on the stud is arranged in each preformed hole, the steel cover plate 11 is fixed with the precast concrete plate, and the upper surface of the steel cover plate 11 is flush with the upper surface of the precast concrete plate 8.
The generating line of preferred bell mouth becomes 60 with the horizontal plane, and 60 as angle commonly used convenient to girder steel flange processing drilling, the aperture D of the lower part circular port of further preferred girder steel connecting hole is (D +2) mm, and D is 3 external diameters of stud lower screw rod section.
Preferably, a section of the lower threaded rod section 3 which is higher than the top wall of the conical nut 4-2 and is positioned between the bottom surfaces of the inserting blocks 6 is used as a necking rod section, the cross-sectional area of the necking rod section is smaller than that of the rest positions of the stud, the necking rod section is a section for reducing the cross-sectional area of the threaded rod, the damage position of the bolt can be induced to be transferred to the position with the smallest cross-sectional area, and the height of the optimized necking rod section is 5 mm. And tightening the lower nut 4-3 by means of a torque wrench applies a pretension to the lower threaded shank segment 3 between the conical nut 4-2 and the lower nut 4-3.
As shown in fig. 6, preferably, the preformed hole 9 consists of semicircular platforms at two sides and a quadrangular prism at the middle, so that the occupation ratio of the preformed hole to the concrete slab can be reduced, and the integrity of the reinforcing bar and the concrete slab is not affected; the side plane ABCD of the semicircular frustum body is an isosceles trapezoid and is completely the same as and coincident with the side surface of the quadrangular prism body. The bottom surface semi-circle radius r of the preformed hole 9225mm, in order to reduce the sliding and stress concentration of the insertion block, the included angle between the generatrix of the semicircular frustum body of the reserved hole and the top wall of the upper flange of the steel beam is α2＝80°。
Preferably, the inserting block 6 is made of high-strength mortar with the compressive strength not lower than 100 MPa; the distance h between the bottom surface of the insert block 6 and the top wall of the conical nut 4-21The radius r of the bottom surfaces of the semicircular table bodies 6-1 and 6-2 at the two sides of the inserting block 6 can be changed1To adjust, i.e. h1＝tan80°×(r1-25)-h2,h2Is the distance h between the top wall of the cone nut and the top flange of the steel beam1Smaller bolt shear connector stiffness and bearingThe larger the load capacity; the thickness of the precast concrete slab 8 is preferably 150mm, that is, the height of the prepared hole 9 is 150mm, and the height H of the insert block 6 is preferably 100 mm.
The taper nut 4-2 in the shear bolt sleeve set needs to be processed into α shown in figure 4 by a common nut 4-1 in a factory1Inclination angle, for facilitating the processing of flange holes of the steel beam and the connection of the combined beam, the preferred included angle α between the taper generatrix of the conical nut 4-2 and the top wall of the upper flange of the steel beam160 °; in the assembling process, a section of lower thread rod section 3 higher than the upper surface of the conical nut 4-2 is reserved to be used as a necking rod section, and the height of the optimized necking rod section is 5 mm.
The installation process of this structure is as follows: after the precast concrete plate 8 is hung on the upper flange 7 of the I-shaped steel beam 10 as shown in fig. 5, screw connection holes 6-4 and 6-5 in the insert block 6 are respectively aligned to the upper parts of two studs in the tapered hole of the upper flange 7 of the I-shaped steel beam 10, as shown in fig. 3, the insert block 6 passes through the upper threaded stud rod section 1 and the smooth rod section 2 to be tightly attached to the wall of the preformed hole 9 of the precast concrete plate 8 and cannot swing, the upper gasket 5-1 is fixed on the top wall of the insert block 6 by screwing the upper nut 4-1, and then the upper nut 4-1 is screwed by using a torque wrench to apply pretension to the stud rod section between the conical nut 4-2 and the upper nut 4-1. Finally, as shown in fig. 5, the steel cover plate 11 is placed on the upper surface of the precast concrete plate preformed hole 9, and the upper surface of the steel cover plate 9 is flush with the upper surface of the precast concrete plate 8.
When the precast concrete plate 8 needs to be replaced, the precast concrete plate 8 can be integrally detached and replaced only by unscrewing the upper nut 4-1 of the shear bolt sleeve and taking out the upper gasket 5-1 and the insert block.
The foregoing description of the embodiments of the invention is provided to facilitate understanding and application of the invention by those skilled in the art. It should be apparent that those skilled in the art can easily make various modifications to the present invention and apply it to other embodiments without having to go through the inventive step. Therefore, the present invention is not limited to the specific embodiments, and those skilled in the art should understand that the modifications and alterations made without departing from the scope of the present invention according to the disclosure of the present invention.
Claims (7)
1. The utility model provides a removable steel-concrete composite beam that main material exempted from damage, includes the I-shaped steel beam that sets up along the horizontal direction the last flange of I-shaped steel beam on support and be provided with precast concrete board on around spaced apart and have a plurality of preformed holes, its characterized in that: an inserting block matched with the shape of the preformed hole is installed in each preformed hole, the top surface of the inserting block is lower than the top surface of the preformed hole, the bottom surface of the inserting block is higher than the bottom surface of the preformed hole, two screw connecting holes are formed in each inserting block at intervals in the left and right direction, a steel beam connecting hole is formed in each I-shaped steel beam at the position corresponding to each screw connecting hole, the upper portion of each steel beam connecting hole is a conical hole, the lower portion of each steel beam connecting hole is a circular hole with the same diameter as the bottom end of the conical hole, the top of each conical hole is a large-diameter end, a conical nut is installed in each conical hole in the upper portion of each steel beam connecting hole, the lower portion of each conical nut is matched with the shape of the conical hole, and the top wall of each conical nut is exposed out of the top wall of the upper flange;
each screw connecting hole is inserted with a double-end stud, and the double-end stud comprises an upper threaded rod section, a smooth rod section and a lower threaded rod section which are sequentially connected from top to bottom; the lower threaded rod section of the stud sequentially penetrates through a cone nut, a steel beam connecting hole, a lower gasket and a lower nut which are correspondingly arranged on the I-shaped steel beam, the cone nut is in threaded connection with the stud, and the lower gasket is fixed on the bottom wall of the lower flange of the I-shaped steel beam by screwing the lower nut; and the conical nut is tightly fixed on the wall of the conical hole of the I-shaped steel beam in a fitting manner by screwing the lower nut; the upper part of the stud is sleeved with an upper gasket and is in threaded connection with an upper nut, and the upper gasket is fixed on the top wall of the insert block by screwing the upper nut; the upper threaded rod section and the smooth rod section of the stud are arranged in the screw connecting hole of the insert block; and a steel cover plate supported on the stud is arranged in each preformed hole, the steel cover plate is fixed with the precast concrete plate, and the upper surface of the steel cover plate is flush with the upper surface of the precast concrete plate.
2. The main material damage-free detachable steel-concrete composite beam according to claim 1, characterized in that: the generatrix of the conical hole is 60 degrees with the horizontal plane.
3. The main material damage-free detachable steel-concrete composite beam according to claim 1 or 2, characterized in that: and a section of lower threaded rod section which is higher than the top wall of the conical nut and positioned between the bottom surfaces of the inserting blocks is used as a necking rod section, and the cross sectional area of the necking rod section is smaller than that of the rest parts of the double-end stud.
4. The main material damage-free detachable steel-concrete composite beam according to claim 3, wherein: the height of the necking rod section is 5 mm.
5. The main material damage-free detachable steel-concrete composite beam according to claim 3, wherein: the preformed hole consists of semicircular platforms at two sides and a quadrangular prism at the middle part; the side plane of the semicircular table body is an isosceles trapezoid and is completely identical with and coincident with the side surface of the quadrangular prism, and the semicircular radius r of the bottom surface of the preformed hole225mm, the included angle between the generatrix of the semicircular frustum of the preformed hole and the top wall of the upper flange of the steel beam is α2＝80°。
6. The main material damage-free detachable steel-concrete composite beam according to claim 5, wherein: the distance h between the bottom surface of the insert block and the top wall of the conical nut1＝tan80°×(r1-25)-h2，h2Is the distance between the top wall of the cone nut and the top flange of the steel beam, r1The radius of the bottom surface of the semicircular table bodies on the two sides is shown.
7. Main material damage-free detachable according to claim 6The steel-concrete unloading combined beam is characterized in that the included angle between the taper nut taper bus and the top wall of the upper flange of the steel beam is α1＝60°。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921608263.5U CN211114418U (en) | 2019-09-25 | 2019-09-25 | Main material damage-free detachable steel-concrete combined beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201921608263.5U CN211114418U (en) | 2019-09-25 | 2019-09-25 | Main material damage-free detachable steel-concrete combined beam |
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| CN211114418U true CN211114418U (en) | 2020-07-28 |
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| CN201921608263.5U Expired - Fee Related CN211114418U (en) | 2019-09-25 | 2019-09-25 | Main material damage-free detachable steel-concrete combined beam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593485A (en) * | 2019-09-25 | 2019-12-20 | 天津大学 | Main material damage-free detachable steel-concrete combined beam |
| CN112031230A (en) * | 2020-09-04 | 2020-12-04 | 建研科技股份有限公司 | Shear key connection structure for interface of prefabricated reinforced concrete floor slab and prefabricated concrete beam |
| CN113481815A (en) * | 2021-06-23 | 2021-10-08 | 浙江交通职业技术学院 | Multiple-protection concrete composite bridge and manufacturing method thereof |
| CN114941398A (en) * | 2022-06-06 | 2022-08-26 | 重庆三峡学院 | Detachable steel concrete composite beam with self-resetting device |
-
2019
- 2019-09-25 CN CN201921608263.5U patent/CN211114418U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593485A (en) * | 2019-09-25 | 2019-12-20 | 天津大学 | Main material damage-free detachable steel-concrete combined beam |
| CN112031230A (en) * | 2020-09-04 | 2020-12-04 | 建研科技股份有限公司 | Shear key connection structure for interface of prefabricated reinforced concrete floor slab and prefabricated concrete beam |
| CN112031230B (en) * | 2020-09-04 | 2023-03-07 | 中建研科技股份有限公司 | Shear key connection structure for interface of prefabricated reinforced concrete floor slab and prefabricated concrete beam |
| CN113481815A (en) * | 2021-06-23 | 2021-10-08 | 浙江交通职业技术学院 | Multiple-protection concrete composite bridge and manufacturing method thereof |
| CN114941398A (en) * | 2022-06-06 | 2022-08-26 | 重庆三峡学院 | Detachable steel concrete composite beam with self-resetting device |
| CN114941398B (en) * | 2022-06-06 | 2023-08-04 | 重庆三峡学院 | Detachable steel concrete composite beam with self-resetting device |
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Granted publication date: 20200728 Termination date: 20210925 |