CN111734033A - Floor system structure with prefabricated double-curved arch shell and construction method thereof - Google Patents
Floor system structure with prefabricated double-curved arch shell and construction method thereof Download PDFInfo
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- CN111734033A CN111734033A CN202010581277.3A CN202010581277A CN111734033A CN 111734033 A CN111734033 A CN 111734033A CN 202010581277 A CN202010581277 A CN 202010581277A CN 111734033 A CN111734033 A CN 111734033A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/43—Floor structures of extraordinary design; Features relating to the elastic stability; Floor structures specially designed for resting on columns only, e.g. mushroom floors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/32—Arched structures; Vaulted structures; Folded structures
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Abstract
The invention discloses a floor system structure with a prefabricated double-curved arch shell, which is characterized by comprising upright columns, beams (2), a filling layer and the prefabricated double-curved arch shell, wherein the upright columns and the beams form a frame, the beams are distributed along the transverse direction and the longitudinal direction, four beams connected end to end form a beam lattice, a prefabricated double-curved arch shell is arranged in each beam lattice, the upper surface and the lower surface of the prefabricated double-curved arch shell are both in a double-curved arch shape, and the edges of the prefabricated double-curved arch shell are respectively fixedly connected with the side surfaces of the four beams; the filling layer covers the prefabricated hyperbolic arch shell, and the top surface of the filling layer is flat. The invention fully utilizes the superior compression performance of the concrete, avoids the poor tensile property of the concrete and can save a large amount of steel bars and concrete; the prefabricated double-curved arch shell evenly distributes and transmits load to the frame, so that the stress of the frame structure is balanced, the edge of the prefabricated double-curved arch shell is fixed by utilizing the side of the frame beam, and the bearing capacity of the prefabricated double-curved arch shell is improved.
Description
Technical Field
The invention relates to a floor system structure with prefabricated double-curved arch shells and a construction method thereof, belonging to the technical field of building structures.
Background
Bidirectional frame concrete floors in building constructions are widely used, such as underground parking garages. In order to bear larger gravity and meet the waterproof requirement, the floor form often adopted is as follows: a layer of reinforced concrete floor slab is placed on the frame beam to bear load, and when the frame span is 6-15 m, the gravity is borne through bending of the slab, bending of the secondary beam and bending of the main beam, so that more concrete and steel bars are consumed, and the economy of the floor system is poor.
The tensile strength of the concrete is only 1/10-1/20 of the compressive strength, so that the concrete member is always expected to exert the compressive performance to the maximum extent and avoid the tensile stress when the concrete member is designed. Arch bridges are the most common way in the structural design of bridges, whereas arch-type structures are rarely seen in the design of residential buildings.
Brick arch shells have been used in brick-lined buildings decades ago by building an arch coupon from bricks on the top of the next floor, and filling the upper part of the arch coupon into a floor slab as the previous floor, which has been eliminated with the economic improvement of reinforced concrete and the requirement of earthquake resistance.
At present, the reinforced concrete floor structure widely adopted at the span of 6-12 meters is a beam plate structure, wherein the comprehensive economy of the haunched large-plate floor structure is better. But the vertical load is born to the ability of bending of beam slab structure backup plate and secondary beam, and the compressive capacity of concrete is not fully exerted to this kind of structure, and concrete and reinforcing bar quantity are great.
Patent document 1 (publication number CN 103046769A) discloses a building with prefabricated hyperbolic arch shells and energy-saving walls, wherein the floor slab is a concrete integral floor slab with four sides thick, a thin middle, an upper flat surface and a lower hyperbolic arch, and conforms to the stress mechanism of a flat slab; when the floor slab is uniformly loaded vertically, the upper reinforcing steel bars of the slab at the thickened part of the periphery of the column of the floor slab are pulled, the lower concrete is pressed, and the pulling force is balanced with the pressure, so that the floor slab has no side thrust to the peripheral members; when the floor slab is in the span, the concrete on the upper part of the slab is compressed, and the steel bars on the lower part are pulled; and the floor slab is an integral plate, and the reinforcing steel bars on the upper part of the plate are in deformation coordination with the concrete on the lower part under compression. The building disclosed in patent document 1 has the disadvantages that the building is essentially a slab-column structure, similar to an armpit large slab floor structure, the bending capability of the backup slab bears the vertical load, the compression capability of the concrete is not fully exerted, and the consumption of the concrete and the steel bars is large.
Disclosure of Invention
Aiming at the problem that the haunched large plate does not give full play to the characteristic of high compressive strength of concrete in the prior art, the invention provides a floor structure with a prefabricated double-curved arch shell and a construction method thereof in order to improve the stress condition of the floor structure, reduce the using amount of reinforcing steel bars and concrete and improve the bearing capacity. The specific technical scheme is as follows.
A floor structure with prefabricated double-curved arch shells is characterized by comprising upright columns, beams, a filling layer and the prefabricated double-curved arch shells, wherein the upright columns and the beams form a frame, the beams are distributed along the transverse direction and the longitudinal direction, four beams connected end to end form a beam lattice, the prefabricated double-curved arch shells are arranged in each beam lattice, the upper surfaces and the lower surfaces of the prefabricated double-curved arch shells are both in a double-curved arch shape, and the edges of the prefabricated double-curved arch shells are fixedly connected with the side surfaces of the four beams respectively; the filling layer covers the prefabricated hyperbolic arch shell, and the top surface of the filling layer is flat.
By adopting the technical scheme, the top of the prefabricated double-curved arch shell is positioned in the center of the beam lattice, the prefabricated double-curved arch shell can convert vertical load into pressure on the section of the arch shell and transmit the pressure to the beam, and the double-curved arch shell only bears compressive stress and does not have tensile stress on the whole; the peripheral edges of the prefabricated double-curved arch shell are firmly connected with the beams, the concrete frame beams can limit the displacement of the edges of the prefabricated double-curved arch shell, and the frame beams in the mathematical model are equivalent to supports for fixing the edges of the prefabricated double-curved arch shell, so that the vertical bearing capacity of the prefabricated double-curved arch shell can be greatly improved, and the using amount of concrete and steel bars can be further saved. The upper portion of prefabricated hyperbolic arch shell is the filling layer, and the filling layer plays vertical load evenly distributed to the effect on prefabricated hyperbolic arch shell, prevents the stress concentration condition. The prefabricated double-curved arch shell is prefabricated in a factory and is transported to a construction site for installation, and special equipment and processes are not needed for construction of the connection part of the prefabricated double-curved arch shell and the beam, so that the construction cost is low and the construction speed is high. The prefabricated hyperbolic arched shell is arched in both the transverse direction and the longitudinal direction, is not required to have the same curvature on any transverse or longitudinal section, and can be a hyperbolic paraboloid torsional shell, a spherical shell and the like.
Furthermore, the filling layer is also provided with a panel, and the panel plays a role in meeting use requirements, for example, when a vehicle is loaded, the panel uniformly transmits the vertical pressure to the filling layer.
Furthermore, a boss is arranged on the side surface of the beam, and the edge of the prefabricated double-curved arch shell is placed on the boss; the edge of prefabricated hyperbolic arched shell has the reinforcing bar of stretching out, the side of roof beam is higher than the position of boss also has the reinforcing bar of stretching out, prefabricated hyperbolic arched shell with the reinforcing bar reciprocal fixed connection that stretches out of roof beam, prefabricated hyperbolic arched shell with clearance between the roof beam is filled concrete or slip casting material, can set up horizontal and vertically crisscross reinforcing bar in the prefabricated hyperbolic arched shell, and the reinforcing bar also is the arch.
Preferably, the prefabricated double-curved arch shell comprises more than two prefabricated modules, the joints of the adjacent prefabricated modules are provided with extending steel bars, the extending steel bars of the adjacent prefabricated modules are fixedly connected with each other, gaps between the adjacent prefabricated modules are filled with concrete or grouting materials, and the more than two prefabricated modules are spliced with each other on a construction site to form the prefabricated double-curved arch shell, so that the manufacturing difficulty and the transportation cost of the prefabricated double-curved arch shell are reduced.
Furthermore, the thickness of the middle of the prefabricated double-arch shell is smaller than that of the edge, so that the stress condition of the prefabricated double-arch shell is met, and the use amount of concrete is reduced.
Furthermore, convex stiffening ribs are fixedly arranged on the lower surface of the prefabricated double-curved arch shell, extend along the transverse direction and the longitudinal direction and are in a grid shape; the arrangement of the stiffening ribs is beneficial to further improving the bearing capacity of the prefabricated double-curved arch shell; preferably, the bottom surface of the stiffening rib is horizontal, and a prestressed steel bar is arranged in the stiffening rib.
Furthermore, a connecting piece is arranged between two adjacent parallel beams, the connecting piece is a steel bar or a steel strand, and the connecting piece can restrict the deformation of the prefabricated double-curved arch shell to a certain extent.
Further, the filling layer is made of at least one of slag, expanded perlite, aerated concrete, ceramsite concrete, sand, building waste residues and plain concrete.
Further, the prefabricated hyperbolic arch shell is made of reinforced concrete, fiber concrete or plain concrete.
Further, the panel is made of reinforced concrete, fiber concrete, plain concrete or sprayed concrete.
Based on the same inventive concept, the invention also relates to a construction method of the floor structure with the prefabricated double-arch shell, which mainly comprises the following steps:
1) pouring the upright posts and the beams for the upright post and beam formwork, wherein the side surfaces of the beams are provided with extending steel bars;
2) hoisting the prefabricated double-curved arch shell, fixedly connecting the extended reinforcing steel bars at the edge of the prefabricated double-curved arch shell with the extended reinforcing steel bars of the beam, and filling concrete or grouting material in the gap between the prefabricated double-curved arch shell and the beam;
3) laying a filling layer;
4) and binding the steel bars of the panel and pouring the panel.
Further, the step 2) is also provided with a step of splicing adjacent prefabricated modules, wherein the extending steel bars of the adjacent prefabricated modules are fixedly connected with each other, and gaps between the adjacent prefabricated modules are filled with concrete or grouting materials.
Compared with the existing floor structure, the floor structure has the following beneficial effects.
The invention gives play to the characteristic that the bidirectional (transverse and longitudinal) section is pressed when the concrete prefabricated double-curved arch shell bears vertical load, and the load is uniformly distributed and transmitted to the frame, so that the stress of the frame structure is balanced, thereby ensuring the economy of the frame design.
The invention gives full play to the vertical load transmitted by the prefabricated hyperbolic arch shell in a pressure mode, fully utilizes the superior compression performance of the concrete and avoids the poor tensile property of the concrete, thereby saving a large amount of steel bars and concrete.
The invention utilizes the lateral bending rigidity and the bearing capacity of the bidirectional (transverse and longitudinal) concrete frame beam, and utilizes the frame beam side to fix the edge of the prefabricated double-curved arch shell, thereby improving the bearing capacity of the prefabricated double-curved arch shell.
The invention utilizes the gap between the prefabricated double-arch shell and the floor plane to fill light materials and arranges the panel to disperse the concentrated load on the floor, thereby playing the role of protecting the prefabricated double-arch shell and reducing the local bending moment, and reducing the thickness of the prefabricated double-arch shell.
The concrete prefabricated double-curved arch shell is prefabricated in a factory, so that a complex template is prevented from being built on a construction site, the production and construction efficiency is greatly improved, and particularly, the prefabricated double-curved arch shell is produced by splicing a plurality of prefabricated modules, so that the production efficiency can be further improved.
Drawings
FIG. 1 is a partial top plan view of a floor structure of the present invention;
FIG. 2 is a partial top plan view of the floor structure of the present invention (with the fill layer and face sheets not shown);
FIG. 3 is a cross-sectional view A-A of FIG. 1 (one embodiment);
FIG. 4 is an enlarged view of area A of FIG. 3;
FIG. 5 is an enlarged view of area B of FIG. 3;
FIG. 6 is a cross-sectional view A-A of FIG. 1 (in another embodiment);
fig. 7 is an enlarged view of the area a in fig. 6.
In the figure: the prefabricated double-curved arch shell structure comprises columns 1, beams 2, bosses 2.1, a filling layer 3, a prefabricated double-curved arch shell 4, prefabricated modules 4.1, a panel 5, reinforcing steel bars 6, extending reinforcing steel bars 6.1, a transverse X direction and a longitudinal Y direction.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
Referring to fig. 1-5, the floor structure with the prefabricated double-curved arch shell comprises an upright post 1, a beam 2, a filling layer 3 and a prefabricated double-curved arch shell 4, wherein the upright post 1 and the beam 2 form a frame, the beam 2 is distributed along two directions of a transverse direction X and a longitudinal direction Y, four beams 2 connected end to end form a beam lattice, the prefabricated double-curved arch shell 4 is arranged in each beam lattice, the upper surface and the lower surface of the prefabricated double-curved arch shell 4 are both in a double-curved arch shape, and the edge of the prefabricated double-curved arch shell 4 is fixedly connected with the side surfaces of the four beams 2 respectively; the filling layer 3 covers the prefabricated hyperbolic arch shell 4, and the top surface of the filling layer 3 is flat. Preferably, a face plate 5 is also provided on the filling layer 3. Wherein the beam 2 is a concrete rectangular section beam.
As shown in fig. 2-4, the prefabricated double-curved arch shell 4 comprises two prefabricated modules 4.1, the two prefabricated modules 4.1 are approximately symmetrically distributed, the reinforcing steel bars 6 in the two prefabricated modules 4.1 are transversely and longitudinally staggered, and the reinforcing steel bars 6 are in an arch shape. The joints of the adjacent prefabricated modules 4.1 are provided with extending steel bars 6.1, the extending steel bars 6.1 of the adjacent prefabricated modules 4.1 are fixedly connected with each other, and the connecting mode of the extending steel bars 6.1 can be lap joint, welding or sleeve; the gaps between adjacent prefabricated modules 4.1 are filled with concrete or grout. It should be noted that one prefabricated double-curved arch shell 4 may also be composed of more than two prefabricated modules 4.1, and certainly, the prefabricated double-curved arch shell 4 may also be an integrally formed whole. More than two prefabricated modules are spliced to form the prefabricated double-arch shell on a construction site, so that the manufacturing difficulty and the transportation cost of the prefabricated double-arch shell are reduced.
In one embodiment, as shown in fig. 5, the side of the beam 2 is provided with a boss 2.1, and the edge of the prefabricated double-curved arch shell 4 rests on the boss 2.1; the edge of the prefabricated double-curved arch shell 4 is provided with an extended reinforcing steel bar 6.1, the side surface of the beam 2 is higher than the position of the boss 2.1 and is also provided with the extended reinforcing steel bar 6.1, the prefabricated double-curved arch shell 4 and the extended reinforcing steel bar 6.1 of the beam 2 are fixedly connected with each other, and a gap between the prefabricated double-curved arch shell 4 and the beam 2 is filled with concrete or grout. The bosses 2.1 are arranged on the side faces of the beams 2, so that the rapid positioning and installation of the prefabricated double-curved arch shell 4 are facilitated.
In another embodiment, as shown in fig. 6-7, a boss 2.1 is provided on a side surface of the beam 2, a boss 2.1 is correspondingly provided on an edge of a lower surface of the prefabricated double-curved arch shell 4, the boss 2.1 of the beam 2 and the boss 2.1 of the prefabricated double-curved arch shell 4 are arranged oppositely, an extended steel bar 6.1 is provided on the edge of the prefabricated double-curved arch shell 4, an extended steel bar 6.1 is also provided at a position on the side surface of the beam 2 higher than the boss 2.1, the prefabricated double-curved arch shell 4 and the extended steel bar 6.1 of the beam 2 are fixedly connected with each other, and a gap between the prefabricated double-curved arch shell 4 and the beam 2 is filled with concrete or grout. Materials such as rubber can be placed between the boss 2.1 and the boss 2.1, a template does not need to be erected after the extending reinforcing steel bars 6.1 are fixedly connected, concrete or grouting is directly poured between the prefabricated double-curved arch shell 4 and the beam 2, and the construction efficiency is favorably improved.
Preferably, the thickness of the middle of the prefabricated double-curved arch shell 4 is smaller than that of the edge, which accords with the stress condition of the prefabricated double-curved arch shell and is beneficial to reducing the consumption of concrete.
Preferably, the lower surface of the prefabricated double-curved arch shell 4 is fixedly provided with convex stiffening ribs (not shown), and the stiffening ribs extend along the transverse direction and the longitudinal direction and are in a grid shape. Preferably, the bottom surface of the stiffening rib is horizontal, and the stiffening rib is internally provided with prestressed reinforcement.
The material adopted by the filling layer 3 comprises at least one of slag, expanded perlite, aerated concrete, ceramsite concrete, sand, building waste residue and plain concrete, and the requirement of local pressure checking calculation is met.
The prefabricated hyperbolic arch shell 4 is made of reinforced concrete, fiber concrete or plain concrete.
The panel 5 is made of reinforced concrete, fiber concrete, plain concrete or sprayed concrete, and the strength of the panel 5 meets the requirement of local pressure checking calculation and has a certain waterproof function.
The construction method of the floor system structure with the prefabricated double-curved arch shell mainly comprises the following steps of:
1) pouring the upright posts 1 and the beams 2 for the upright post and beam formwork; the upright posts 1 are arranged at intervals along the transverse X direction and the longitudinal Y direction;
2) hoisting the prefabricated double-curved arch shell 4, fixedly connecting the extended reinforcing steel bars 6.1 at the edge of the prefabricated double-curved arch shell 4 with the extended reinforcing steel bars 6.1 of the beam 2, and filling concrete or grouting material in a gap between the prefabricated double-curved arch shell 4 and the beam 2; the prefabricated double-curved arch shell 4 can be formed by mutually splicing a plurality of prefabricated modules 4.1, the extending steel bars of the adjacent prefabricated modules 4.1 are mutually and fixedly connected, and the gaps between the adjacent prefabricated modules are filled with concrete or grouting materials;
3) laying a filling layer 3; a pipeline used for construction is laid in the filling layer 3;
4) and binding the steel bars of the panel 5 and pouring concrete of the panel.
The floor structure utilizes the stress characteristic of the concrete prefabricated double-curved arch shell 4 for resisting the vertical pressure of the floor, the prefabricated double-curved arch shell 4 bears the vertical pressure of the floor, and the strict restriction of the beam lattices on the periphery of the prefabricated double-curved arch shell 4 ensures the good working performance of the prefabricated double-curved arch shell 4. The force transmission process is as follows: the vertical external load borne by the floor system acts on the panel 5, the panel 5 transmits the load to the light material of the filling layer 3, the filling layer 3 transmits pressure to the prefabricated double-curved arch shell 4 in a dispersing way, and the prefabricated double-curved arch shell 4 transmits the vertical load to the peripheral beam 2 through integral compression. Because the beam 2 has enough bearing capacity for the pressure transmitted from the prefabricated double-curved arch shell 4 and the horizontal pressure directions of the prefabricated double-curved arch shells 4 on the two sides of the beam 2 are opposite, the beam 2 cannot generate horizontal displacement, and the edge of the prefabricated double-curved arch shell 4 can be kept approximately fixed. The whole prefabricated double-curved arch shell 4 acts in a manner of bearing compressive stress.
The embodiments of the present invention are described above with reference to the drawings, and the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The floor system structure with the prefabricated double-curved arch shell is characterized by comprising upright columns (1), beams (2), a filling layer (3) and the prefabricated double-curved arch shell (4), wherein the upright columns (1) and the beams (2) form a frame, the beams (2) are distributed along the transverse direction and the longitudinal direction, four beams (2) which are connected end to end form a beam lattice, the prefabricated double-curved arch shell (4) is arranged in each beam lattice, the upper surface and the lower surface of the prefabricated double-curved arch shell (4) are in a double-curved arch shape, and the edges of the prefabricated double-curved arch shell (4) are fixedly connected with the side surfaces of the four beams (2) respectively; the filling layer (3) covers the prefabricated double-curved arch shell (4), and the top surface of the filling layer (3) is flat.
2. Floor construction with prefabricated hyperbolic arch shell as claimed in claim 1, characterized in that said filling layer (3) is further provided with a panel (5).
3. Floor construction with prefabricated double curved arch shell according to claim 1, characterized in that the side of the beam (2) is provided with bosses (2.1), the edge of the prefabricated double curved arch shell (4) resting on the bosses (2.1); the edge of prefabricated hyperbolic arch shell (4) has and stretches out reinforcing bar (6.1), the side of roof beam (2) is higher than the position of boss (2.1) also has and stretches out reinforcing bar (6.1), prefabricated hyperbolic arch shell (4) with the reinforcing bar (6.1) reciprocal fixed connection that stretches out of roof beam (2), prefabricated hyperbolic arch shell (4) with clearance between roof beam (2) is filled concrete or is annotated the thick liquids.
4. Floor construction with prefabricated hyperbolic arch shell as claimed in any one of claims 1-3, characterized in that said prefabricated hyperbolic arch shell (4) comprises more than two prefabricated modules (4.1), where the joints of adjacent prefabricated modules (4.1) have protruding steel bars, where the protruding steel bars of adjacent prefabricated modules (4.1) are fixedly connected to each other, and where the gaps between adjacent prefabricated modules (4.1) are filled with concrete or grout.
5. The floor system structure with the prefabricated double-curved arch shell as claimed in claim 1, wherein a connecting member is arranged between two adjacent parallel beams, and the connecting member is a steel bar or a steel strand.
6. Floor construction with prefabricated double curved arch shells according to claim 1, characterized in that the thickness of the prefabricated double curved arch shells (4) in the middle is smaller than the thickness of the edges.
7. Floor structure with prefabricated double arch shell according to claim 1, characterized in that the lower surface of the prefabricated double arch shell (4) is fixedly provided with protruding stiffening ribs extending in transverse and longitudinal directions in a grid shape.
8. The floor system structure with prefabricated double-curved arch shell as claimed in claim 7, wherein the bottom surface of said stiffening ribs is horizontal, and said stiffening ribs are internally provided with prestressed reinforcement.
9. The floor system structure with the prefabricated hyperbolic arch shell as claimed in claim 2, wherein the material adopted by the filling layer (3) comprises at least one of slag, expanded perlite, aerated concrete, ceramsite concrete, sand, building waste residue and plain concrete; the prefabricated hyperbolic arch shell (4) is made of reinforced concrete, fiber concrete or plain concrete; the panel (5) is made of reinforced concrete, fiber concrete, plain concrete or asphalt concrete.
10. A construction method of a floor system structure with prefabricated double-arch shells as claimed in any one of claims 1 to 9, mainly comprising the following steps:
1) pouring the upright posts (1) and the beams (2) for upright post and beam formwork, wherein the side surfaces of the beams (2) are provided with extending steel bars (6.1);
2) hoisting the prefabricated double-curved arch shell (4), fixedly connecting an extended reinforcing steel bar (6.1) at the edge of the prefabricated double-curved arch shell (4) with an extended reinforcing steel bar of the beam (2), and filling concrete or grouting material in a gap between the prefabricated double-curved arch shell (4) and the beam (2);
3) laying a filling layer (3);
4) and binding the steel bars of the panel (5) and pouring the panel (5).
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| CN113442245A (en) * | 2021-01-26 | 2021-09-28 | 湖南城市学院 | Full-bamboo recombined bamboo and preparation method and application thereof |
| CN114704015A (en) * | 2022-05-07 | 2022-07-05 | 中国矿业大学 | Arched cavity fluid flow floor, manufacturing method and flow pipe |
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| 沈阳建筑工程学院: "《二级注册建筑师考试必读》", 31 January 1989, 中国建筑工业出版社 * |
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| CN113442245A (en) * | 2021-01-26 | 2021-09-28 | 湖南城市学院 | Full-bamboo recombined bamboo and preparation method and application thereof |
| CN113442245B (en) * | 2021-01-26 | 2023-04-28 | 湖南城市学院 | Whole bamboo recombined bamboo and preparation method and application thereof |
| CN114704015A (en) * | 2022-05-07 | 2022-07-05 | 中国矿业大学 | Arched cavity fluid flow floor, manufacturing method and flow pipe |
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