CN114318996A - Airport assembled prestressed pavement structure with composite connection mode and installation method - Google Patents
Airport assembled prestressed pavement structure with composite connection mode and installation method Download PDFInfo
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- CN114318996A CN114318996A CN202210094307.7A CN202210094307A CN114318996A CN 114318996 A CN114318996 A CN 114318996A CN 202210094307 A CN202210094307 A CN 202210094307A CN 114318996 A CN114318996 A CN 114318996A
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Abstract
The invention relates to an airport assembled prestressed pavement structure with a composite connection mode, which comprises prestressed reinforcements (A1), a mortise and tenon sliding connection structure (B) and a three-in-one connection structure (C) which are arranged in a prefabricated cement concrete pavement slab (A); assembled prestressed cement concrete pavement structure adopts trinity connection structure (C) to carry out longitudinal connection, adopts horizontal tenon fourth of twelve earthly branches sliding connection structure (B) to carry out transverse connection. The invention can realize rapid production, prefabrication and rapid installation, and prolongs the service life of the pavement slab.
Description
Technical Field
The invention belongs to the technical field of assembled cement concrete pavements, and particularly relates to an airport assembled prestressed pavement structure adopting a composite connection mode and the technical field of an installation method.
Background
Although the traditional cast-in-place concrete has a mature design method and construction process, the traditional cast-in-place concrete is limited by conditions of long construction period, large influence of climate, difficult supply due to lack of materials and the like, and is difficult to meet the objective requirements of non-stop construction of military airport rush-construction and civil airport reconstruction and extension and rapid repair of pavement damage.
In order to overcome the defects of the traditional cast-in-place cement concrete and simultaneously utilize the excellent bearing performance of the concrete pavement, the fabricated cement concrete pavement for the airport is produced by factory standardization, and the airport pavement is paved on a base layer or a soil base with good flatness and compactness by adopting a mechanical assembly method. The fabricated cement concrete pavement has the advantages of stable quality, good durability, fast open traffic, energy conservation, environmental protection and the like, and is the best choice for fast paving and repairing the airport pavement and reducing the non-stop time. However, in the application process, the load transfer performance of the pavement slab is poor due to the easy problem of the connection structure between the slabs, so that the assembly difficulty of the fabricated cement concrete pavement is increased, and the service performance is poor. Therefore, there is a need for optimizing the structure of the pavement slab and improving the connection structure thereof.
Disclosure of Invention
The invention aims to solve the defects of the problems and provides an airport assembled prestressed pavement structure with a composite connection mode and an installation method.
The invention is realized by adopting the following technical scheme.
The invention relates to an airport assembly type prestressed pavement structure with a composite connection mode, which comprises a prestressed reinforcement A1, a mortise and tenon sliding connection structure B and a three-in-one connection structure C, wherein the prestressed reinforcement A1, the mortise and tenon sliding connection structure B and the three-in-one connection structure C are arranged in a prefabricated cement concrete pavement slab A; the assembled prestressed cement concrete pavement structure adopts a three-in-one connecting structure C for longitudinal connection and adopts a transverse tenon-and-mortise sliding connecting structure B for transverse connection;
the prestressed reinforcement A1 arranged in the precast concrete pavement slab A adopts the arrangement of longitudinal double-layer transverse single-layer.
The mortise and tenon sliding connection structure B comprises a sliding tenon structure 1, a mortise structure, a fixing screw rod 4 and a connecting steel bar 6;
the sliding tenon structure 1 is arranged inside the mortise structure; the sliding tenon structure 1 is fixedly connected with the mortise structure through a fixing screw rod 4;
the connecting steel bars 6 are arranged on the outer side of the mortise structure and fixedly connected with the mortise structure;
the structure of the sliding tenon structure 1 is that the sliding tenon structure is designed into a dumbbell shape; comprises a locking connection part 1.1, a sliding connection part 1.2, and a connection fixing part 1.3 arranged between the locking connection part 1.1 and the sliding connection part 1.2; a screw hole A1.4 is arranged on the locking connection part 1.1 in a penetrating way; a screw hole B1.5 is arranged on the sliding connection part 1.2 in a penetrating way;
the structure of the mortise structure comprises a closed mortise structure 2 and an open mortise structure 3, and the first mortise part 2.1 and the second mortise part 2.2 have the same structure;
the structure of the closed mortise structure 2 comprises a cavity part A2.1 and a surrounding edge A2.2 for accommodating the locking connection part 1.1 in the sliding tenon structure 1, a mortise side wall 2.3, a clamping groove 2.4 arranged on the mortise side wall 2.3 from top to bottom, and a stabilizing part A2.5 arranged at the lower part of the cavity part A2.1; the clamping groove 2.4 is limited, locked and connected with the part 1.1 and cannot horizontally depart; the stable part A2.5 is provided with a screw hole C2.6 in a penetrating way from top to bottom; the depth of the clamping groove 2.5 is matched with the height of the sliding tenon structure 1;
the structure of the open mortise structure 3 comprises a cavity part B3.1 for accommodating the sliding connection part 1.2 in the sliding tenon structure 1, a surrounding edge B3.4 and a stable part B3.2 arranged at the lower part of the cavity part B3.1; the sliding connection part 1.2 is horizontally and movably connected in the cavity part B3.1; the stable part B3.2 is provided with a screw hole D3.3 in a penetrating way from top to bottom;
the screw hole A1.4 and the screw hole C2.6 are arranged up and down correspondingly;
the screw hole B1.5 and the screw hole D3.3 are arranged up and down correspondingly;
the connecting steel bars 6 are smooth steel bars.
The sliding tenon structure 1 further comprises a gasket 5, and the gasket 5 is sleeved on the fixing screw rod 4.
Gaps are arranged between the sliding tenon structure 1 and the mortise structure; the screw hole A1.4 or the screw hole B1.5 is arranged to be a strip hole; the length of screw hole B1.5 is greater than the length of screw hole a 1.4.
The depth of the clamping groove 2.4 is half of the height of the mortise structure.
The sliding tenon structure 1, the mortise structure, the fixing screw rod 4 and the connecting steel bar 6 are made of steel.
The connecting steel bar 6 is fixedly connected with the mortise structure in a welding mode.
The three-in-one connecting structure C consists of a pull rod hole 9 and a three-in-one screw cap vertical hole 7, wherein the three-in-one pull rod 8 is arranged in the three-in-one screw cap vertical hole; wherein, trinity pull rod 8 includes: a three-in-one screw cap 8a, a threaded sleeve 8b and a pull rod 8 c; one end of the pull rod 8c is provided with a screw clamping groove 8d, and the outer wall of the other end of the pull rod is provided with a thread 8 e; the threaded sleeve 8a is pre-embedded in the fabricated prestressed cement concrete pavement slab A.
The method for using the airport assembled prestressed pavement structure with the composite connection mode is characterized by comprising the following steps: and B, mounting the mortise and tenon sliding connection structure: in the plate prefabricating process, after welding connection, the closed mortise structure 2 and the connecting steel bars 6, the open mortise structure 3 and the connecting steel bars 6 are embedded in the road panel, when the plate is installed, the road panel is hoisted to a specified position, the sliding tenon structure 1 is inserted into the closed mortise structure 2 and the open mortise structure 3, the fixing screw rods 4 are sequentially inserted into the gasket 5 and the screw holes of the sliding tenon structure 1 and then screwed into the screw holes of the closed mortise structure 2 and the open mortise structure 3, at the moment, the sliding tenon structure 1 is fixed on the closed mortise structure 2, and the open mortise structure 3 can slide in the screw holes of the sliding tenon structure 1 through the fixing screw rods 4, so that the sliding connection of the two prefabricated road panels is realized;
the installation step of the prestressed cement concrete pavement structure comprises the following steps: when the pavement slab is assembled, the longitudinal connection is adopted to hoist the slab to a specified position, and the pull rod is screwed into the pavement slab; aligning the pull rod with a pull rod hole of an adjacent plate, enabling the longitudinal pull rod to slowly enter a preset pull rod hole, fixing the pull rod by using a screw cap, and finally grouting and filling a gap; hoisting and carrying the two precast slabs to an appointed position for leveling through transverse connection, and inserting the tenon structure into the mortise structure; and inserting the threaded screw rod into a preset screw hole and fixing the threaded screw rod so that the tenon-and-mortise structures are connected into a same whole.
The invention has the beneficial effects that the prefabricated prestressed cement concrete pavement slab is used for prefabricating and producing the assembled prestressed cement concrete pavement slab of the airport and is provided with a transverse and longitudinal connecting structure. When the pavement slab is assembled, the longitudinal connection only needs to hoist the slab to a designated position, the pull rod is screwed into the pavement slab and aims at the pull rod hole of the adjacent slab, so that the longitudinal pull rod slowly enters the preset pull rod hole, the longitudinal pull rod is fixed by the nut, and finally grouting and air filling are performed. Transverse connection only needs to carry two prefabricated plates to the assigned position leveling after, inserts the mortise structure with the tenon structure in, inserts threaded screw in predetermineeing the screw and fixes at last for mortise structure connects for same whole, and the mortise structure of this moment can effectual transmission is the effort between the adjacent road panel, strengthens the biography lotus ability between the road panel. In addition, the sliding mortise structure of the transverse sliding connection structure is not provided with a fixed stop block, so that the transverse sliding connection structure has certain sliding capacity and effectively considered temperature shrinkage stress. In conclusion, the airport assembly type prestressed cement concrete pavement structure adopting the composite connection mode can realize rapid production prefabrication and rapid installation, and prolongs the service life of the pavement slab.
The invention is further explained below with reference to the drawings and the detailed description.
Drawings
Fig. 1 is a schematic view of a top view structure of the arrangement of the prestressed reinforcement of the pavement slab of the present invention.
Fig. 2 is a schematic view of the arrangement cross-sectional structure of the prestressed reinforcement of the pavement slab according to the present invention.
Fig. 3 is an axial side view of the inventive installation.
Fig. 4 is a schematic view of the overall structure of the present invention.
Fig. 5 is a schematic mounting overhead view of the mortise and tenon sliding connection structure B according to the present invention.
Fig. 6 is a schematic longitudinal sectional view of the mortise and tenon sliding connection structure B according to the present invention.
Fig. 7 is a schematic view of a sliding tenon structure of the mortise and tenon sliding connection structure B according to the present invention.
Fig. 8 is a schematic view of a closed mortise structure of the mortise-tenon sliding connection structure B according to the present invention.
Fig. 9 is a schematic view of an open mortise structure of a mortise-tenon sliding connection structure B of the invention.
Fig. 10 is an exploded view of the three-in-one drawbar according to the present invention.
Fig. 11 is a view of a three-in-one connection structure road panel of the present invention.
Detailed Description
See fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, fig. 11.
The invention relates to an airport assembly type prestressed pavement structure with a composite connection mode, which comprises a prestressed reinforcement A1, a mortise and tenon sliding connection structure B and a three-in-one connection structure C, wherein the prestressed reinforcement A1, the mortise and tenon sliding connection structure B and the three-in-one connection structure C are arranged in a prefabricated cement concrete pavement slab A; the assembled prestressed cement concrete pavement structure adopts a three-in-one connecting structure C for longitudinal connection and adopts a transverse tenon-and-mortise sliding connecting structure B for transverse connection;
the prestressed reinforcement A1 arranged in the precast concrete pavement slab A adopts the arrangement of longitudinal double-layer transverse single-layer.
The mortise and tenon sliding connection structure B comprises a sliding tenon structure 1, a mortise structure, a fixing screw rod 4 and a connecting steel bar 6;
the sliding tenon structure 1 is arranged inside the mortise structure; the sliding tenon structure 1 is fixedly connected with the mortise structure through a fixing screw rod 4;
the connecting steel bars 6 are arranged on the outer side of the mortise structure and fixedly connected with the mortise structure;
the structure of the sliding tenon structure 1 is that the sliding tenon structure is designed into a dumbbell shape; comprises a locking connection part 1.1, a sliding connection part 1.2, and a connection fixing part 1.3 arranged between the locking connection part 1.1 and the sliding connection part 1.2; a screw hole A1.4 is arranged on the locking connection part 1.1 in a penetrating way; a screw hole B1.5 is arranged on the sliding connection part 1.2 in a penetrating way;
the structure of the mortise structure comprises a closed mortise structure 2 and an open mortise structure 3, and the first mortise part 2.1 and the second mortise part 2.2 have the same structure;
the structure of the closed mortise structure 2 comprises a cavity part A2.1 and a surrounding edge A2.2 for accommodating the locking connection part 1.1 in the sliding tenon structure 1, a mortise side wall 2.3, a clamping groove 2.4 arranged on the mortise side wall 2.3 from top to bottom, and a stabilizing part A2.5 arranged at the lower part of the cavity part A2.1; the clamping groove 2.4 is limited, locked and connected with the part 1.1 and cannot horizontally depart; the stable part A2.5 is provided with a screw hole C2.6 in a penetrating way from top to bottom; the depth of the clamping groove 2.5 is matched with the height of the sliding tenon structure 1;
the structure of the open mortise structure 3 comprises a cavity part B3.1 for accommodating the sliding connection part 1.2 in the sliding tenon structure 1, a surrounding edge B3.4 and a stable part B3.2 arranged at the lower part of the cavity part B3.1; the sliding connection part 1.2 is horizontally and movably connected in the cavity part B3.1; the stable part B3.2 is provided with a screw hole D3.3 in a penetrating way from top to bottom;
the screw hole A1.4 and the screw hole C2.6 are arranged up and down correspondingly;
the screw hole B1.5 and the screw hole D3.3 are arranged up and down correspondingly;
the connecting steel bars 6 are smooth steel bars.
The sliding tenon structure 1 further comprises a gasket 5, and the gasket 5 is sleeved on the fixing screw rod 4.
Gaps are arranged between the sliding tenon structure 1 and the mortise structure; the screw hole A1.4 or the screw hole B1.5 is arranged to be a strip hole; the length of screw hole B1.5 is greater than the length of screw hole a 1.4.
The depth of the clamping groove 2.4 is half of the height of the mortise structure.
The sliding tenon structure 1, the mortise structure, the fixing screw rod 4 and the connecting steel bar 6 are made of steel.
The connecting steel bar 6 is fixedly connected with the mortise structure in a welding mode.
The three-in-one connecting structure C consists of a pull rod hole 9 and a three-in-one screw cap vertical hole 7, wherein the three-in-one pull rod 8 is arranged in the three-in-one screw cap vertical hole; wherein, trinity pull rod 8 includes: a three-in-one screw cap 8a, a threaded sleeve 8b and a pull rod 8 c; one end of the pull rod 8c is provided with a screw clamping groove 8d, and the outer wall of the other end of the pull rod is provided with a thread 8 e; the threaded sleeve 8a is pre-embedded in the fabricated prestressed cement concrete pavement slab A.
The method for using the airport assembled prestressed pavement structure with the composite connection mode is characterized by comprising the following steps: and B, mounting the mortise and tenon sliding connection structure: in the plate prefabricating process, after welding connection, the closed mortise structure 2 and the connecting steel bars 6, the open mortise structure 3 and the connecting steel bars 6 are embedded in the road panel, when the plate is installed, the road panel is hoisted to a specified position, the sliding tenon structure 1 is inserted into the closed mortise structure 2 and the open mortise structure 3, the fixing screw rods 4 are sequentially inserted into the gasket 5 and the screw holes of the sliding tenon structure 1 and then screwed into the screw holes of the closed mortise structure 2 and the open mortise structure 3, at the moment, the sliding tenon structure 1 is fixed on the closed mortise structure 2, and the open mortise structure 3 can slide in the screw holes of the sliding tenon structure 1 through the fixing screw rods 4, so that the sliding connection of the two prefabricated road panels is realized;
the foregoing is only a part of the specific embodiments of the present invention and specific details or common general knowledge in the schemes have not been described herein in more detail. It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by means of equivalent substitution or equivalent transformation for those skilled in the art are within the protection scope of the present invention. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The airport assembled prestressed pavement structure with the composite connection mode is characterized by comprising prestressed reinforcements (A1), mortise and tenon sliding connection structures (B) and three-in-one connection structures (C) which are arranged in a prefabricated cement concrete pavement slab (A); assembled prestressed cement concrete pavement structure adopts trinity connection structure (C) to carry out longitudinal connection, adopts horizontal tenon fourth of twelve earthly branches sliding connection structure (B) to carry out transverse connection.
2. The airport assembled prestressed pavement structure of composite connection type as claimed in claim 1, wherein said prestressed reinforcement (a1) installed in said precast concrete pavement slab (a) is arranged in longitudinal double-layer and transverse single-layer.
3. The airport assembled prestressed pavement structure with composite connection mode according to claim 1, wherein the mortise and tenon sliding connection structure (B) comprises a sliding tenon structure (1), a mortise structure, a fixing screw (4) and a connecting steel bar (6);
the sliding tenon structure (1) is arranged inside the mortise structure; the sliding tenon structure (1) is fixedly connected with the mortise structure through a fixing screw (4);
the connecting steel bars (6) are arranged on the outer side of the mortise structure and are fixedly connected with the mortise structure;
the sliding tenon structure (1) is structurally characterized in that the sliding tenon structure is arranged to be dumbbell-shaped; comprises a locking connection part (1.1), a sliding connection part (1.2), and a connection fixing part (1.3) arranged between the locking connection part (1.1) and the sliding connection part (1.2); a screw hole A (1.4) is arranged on the locking connection part (1.1) in a penetrating way; a screw hole B (1.5) is arranged on the sliding connection part (1.2) in a penetrating way;
the mortise structure comprises a closed mortise structure (2) and an open mortise structure (3), and the first mortise piece (2.1) and the second mortise piece (2.2) have the same structure;
the structure of the closed mortise structure (2) comprises a cavity part A (2.1) and a surrounding edge A (2.2) which are accommodated by a locking connection part (1.1) in the sliding tenon structure (1), a mortise side wall (2.3), a clamping groove (2.4) which is formed in the mortise side wall (2.3) from top to bottom, and a stabilizing part A (2.5) which is arranged at the lower part of the cavity part A (2.1); the clamping groove (2.4) is limited, locked and connected with the connecting part (1.1) and cannot be horizontally separated; the stable part A (2.5) is provided with a screw hole C (2.6) in a penetrating way from top to bottom; the depth of the clamping groove (2.5) is matched with the height of the sliding tenon structure (1);
the structure of the open mortise structure (3) comprises a cavity part B (3.1) and a surrounding edge B (3.4) which are used for accommodating the sliding connection part (1.2) in the sliding tenon structure (1), and a stable part B (3.2) which is arranged at the lower part of the cavity part B (3.1); the sliding connection part (1.2) is in horizontal sliding connection in the cavity part B (3.1); the stable part B (3.2) is provided with a screw hole D (3.3) in a penetrating way from top to bottom;
the screw hole A (1.4) and the screw hole C (2.6) are arranged up and down correspondingly;
the screw hole B (1.5) and the screw hole D (3.3) are arranged up and down correspondingly;
the connecting steel bars (6) are smooth steel bars.
4. The airport assembled prestressed pavement structure with composite connection mode according to claim 1, characterized in that said sliding tenon structure (1) further comprises a washer (5), said washer (5) is sleeved on the fixing screw (4).
5. The airport assembled prestressed pavement structure with composite connection mode according to claim 1, characterized in that a gap is arranged between the sliding tenon structure (1) and the mortise structure; the screw hole A (1.4) or the screw hole B (1.5) is arranged to be a strip hole; the length of the screw hole B (1.5) is greater than that of the screw hole A (1.4).
6. The airport assembled prestressed pavement structure of composite connection mode according to claim 1, characterized in that the depth of said slot (2.4) is half of the height of said mortise structure.
7. The airport assembled prestressed pavement structure with composite connection mode according to claim 1, characterized in that the sliding tenon structure (1), the mortise structure, the fixing screw (4) and the connecting steel bars (6) are made of steel.
8. The airport assembled prestressed pavement structure of composite connection mode according to claim 1, characterized in that the connecting steel bars (6) are fixedly connected with the mortise structure by welding.
9. The airport assembled prestressed pavement structure of composite connection mode of claim 1, wherein said three-in-one connection structure (C) is composed of tie rod hole (9), three-in-one nut vertical hole (7) and three-in-one tie rod (8); wherein, trinity pull rod (8) include: a three-in-one screw cap (8a), a threaded sleeve (8b) and a pull rod (8 c); one end of the pull rod (8c) is provided with a screw clamping groove (8d), and the outer wall of the other end of the pull rod is provided with a thread (8 e); the threaded sleeve (8a) is pre-embedded in the assembled prestressed cement concrete pavement slab (A).
10. A method of using the composite type connecting airport assembled prestressed pavement structure of claim 1, characterized in that said method comprises the following steps: and (B) installing the mortise and tenon sliding connection structure: in the plate prefabricating process, after welded connection, a closed mortise structure (2), connecting steel bars (6), an open mortise structure (3) and the connecting steel bars (6) are buried in a road panel, when the plate is installed, the road panel is hoisted to a specified position, a sliding tenon structure (1) is inserted into the closed mortise structure (2) and the open mortise structure (3), a fixing screw (4) is sequentially inserted into screw holes of a gasket (5) and the sliding tenon structure (1), then the sliding tenon structure (1) is screwed into threaded holes of the closed mortise structure (2) and the open mortise structure (3), at the moment, the sliding tenon structure (1) is fixed on the closed mortise structure (2), and the open mortise structure (3) slides in the screw hole on the sliding tenon structure (1) through the fixing screw (4), so that the two prefabricated road panels are connected in a sliding manner;
the installation step of the prestressed cement concrete pavement structure comprises the following steps: when the pavement slab is assembled, the longitudinal connection is adopted to hoist the slab to a specified position, and the pull rod is screwed into the pavement slab;
aligning the pull rod with a pull rod hole of an adjacent plate, enabling the longitudinal pull rod to slowly enter a preset pull rod hole, fixing the pull rod by using a screw cap, and finally grouting and filling a gap;
hoisting and carrying the two precast slabs to an appointed position for leveling through transverse connection, and inserting the tenon structure into the mortise structure;
and inserting the threaded screw rod into a preset screw hole and fixing the threaded screw rod so that the tenon-and-mortise structures are connected into a same whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210094307.7A CN114318996A (en) | 2022-01-26 | 2022-01-26 | Airport assembled prestressed pavement structure with composite connection mode and installation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210094307.7A CN114318996A (en) | 2022-01-26 | 2022-01-26 | Airport assembled prestressed pavement structure with composite connection mode and installation method |
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| CN114318996A true CN114318996A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210094307.7A Pending CN114318996A (en) | 2022-01-26 | 2022-01-26 | Airport assembled prestressed pavement structure with composite connection mode and installation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115058933A (en) * | 2022-05-20 | 2022-09-16 | 安徽久传建筑工程有限公司 | Town road laying structure |
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| CN2802164Y (en) * | 2005-06-15 | 2006-08-02 | 钟俊飞 | Cold-forging die strong beam formed connecting screw |
| JP2007262881A (en) * | 2007-05-11 | 2007-10-11 | Tadaaki Tanabe | High strength reinforced concrete precast slab |
| CN201334311Y (en) * | 2008-12-23 | 2009-10-28 | 贵阳铝镁设计研究院 | Rail joint for preventing overhead traveling crane from trapping and derailing |
| CN216973015U (en) * | 2022-01-26 | 2022-07-15 | 中国电建集团昆明勘测设计研究院有限公司 | Airport assembled prestressed pavement structure with composite connection mode |
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2022
- 2022-01-26 CN CN202210094307.7A patent/CN114318996A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2802164Y (en) * | 2005-06-15 | 2006-08-02 | 钟俊飞 | Cold-forging die strong beam formed connecting screw |
| JP2007262881A (en) * | 2007-05-11 | 2007-10-11 | Tadaaki Tanabe | High strength reinforced concrete precast slab |
| CN201334311Y (en) * | 2008-12-23 | 2009-10-28 | 贵阳铝镁设计研究院 | Rail joint for preventing overhead traveling crane from trapping and derailing |
| CN216973015U (en) * | 2022-01-26 | 2022-07-15 | 中国电建集团昆明勘测设计研究院有限公司 | Airport assembled prestressed pavement structure with composite connection mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115058933A (en) * | 2022-05-20 | 2022-09-16 | 安徽久传建筑工程有限公司 | Town road laying structure |
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