Post-cast ultra-high performance concrete structure between prefabricated top plate and prefabricated wall

Abstract

The utility model discloses a post-cast ultra-high performance concrete structure between a prefabricated top plate and prefabricated walls, which is characterized in that wall joint surfaces of the two prefabricated walls are arranged on two sides of a top plate joint surface of the prefabricated top plate to form a groove structure with a concave cross section; a plurality of top plate overhanging steel bars in one-to-one correspondence are arranged on the two top plate combination surfaces and are arranged in an inner row and an outer row in the thickness direction of the prefabricated top plate; each pair of coaxially-arranged top plate overhanging steel bars in the two rows of top plate overhanging steel bars close to the outside of the two prefabricated top plates are provided with additional steel bars; a plurality of transverse steel bars are arranged on the additional steel bars in the width direction of the groove structure; and ultra-high performance concrete is poured in the groove structure. During construction, the prefabricated wall and the prefabricated top plate are manufactured firstly; then temporarily fixing in place through a temporary support; additional steel bars and transverse steel bars are arranged, and finally ultra-high performance concrete is poured. The device is convenient to install, the project construction period can be shortened, the construction risk is reduced, and good social and economic benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled concrete structure construction, in particular to a post-cast ultra-high performance concrete structure between a prefabricated top plate and a prefabricated wall. Background Art

[0002] Prefabricated concrete structures are assembled from prefabricated components through safe and reliable connection nodes. They include prefabricated monolithic concrete structures and fully prefabricated concrete structures. Among them, prefabricated monolithic concrete frame structures are an important component and typical representative of my country's building industrialization structural system. Studies have shown that the performance of prefabricated concrete structure connection nodes has an important impact on the performance of the entire prefabricated concrete structure.

[0003] The current status of related technologies in this field is as follows:

[0004] At present, the main construction methods for roof and wall nodes are: the slab adopts composite slab and the node area adopts post-cast concrete. The specific steps are as follows:

[0005] 1. Install the prefabricated wall in place and fix it;

[0006] 2. Install the prefabricated part of the composite slab in place and temporarily fix it;

[0007] 3. Install the steel bars on the composite slab surface and tie them up;

[0008] 4. Cast the node area and the post-casting layer of the composite slab together with ordinary concrete;

[0009] 5. Post-pour concrete maintenance.

[0010] In practical applications, the requirements of GB 50010-2010 "Code for Design of Concrete Structures" must be met. The length of the steel bars extending into the node area of ​​the composite slab is relatively long, exceeding half of the node width. The steel bars in the node area are prone to collision, and special precautions must be taken during design. The steel bars in the node area are crowded, resulting in low construction efficiency and difficulty in ensuring quality. In addition, the amount of post-poured concrete is large and the construction period is long.

[0011] Therefore, how to simplify the connection structure and process between the prefabricated top plate and the prefabricated wall and reduce the design and construction costs has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0012] In view of the above-mentioned defects of the prior art, the utility model provides a post-cast ultra-high performance concrete structure between a prefabricated top plate and a prefabricated wall, the purpose of which is to simplify the connection structure and process between the prefabricated top plate and the prefabricated wall and reduce the design and construction costs.

[0013] To achieve the above-mentioned purpose, the utility model discloses a post-cast ultra-high performance concrete structure between a prefabricated top plate and a prefabricated wall, comprising a prefabricated top plate and a prefabricated wall.

[0014] Wherein, one side of the prefabricated wall connected to the prefabricated top plate is connected to two prefabricated top plates located on both sides of the prefabricated wall;

[0015] The wall joint surface between the prefabricated wall and the two prefabricated top plates, and the top plate joint surface between each prefabricated top plate and the prefabricated wall are roughened;

[0016] The two top plate joint surfaces are located on both sides of the wall joint surface, forming a groove structure with a concave cross section;

[0017] The wall joint surface is provided with a wall extension steel bar perpendicular to the wall joint surface at a position close to each of the prefabricated top plates;

[0018] The two top plate joint surfaces of the two prefabricated top plates are provided with a plurality of top plate protruding steel bars corresponding to each other one by one;

[0019] Each of the top plate protruding steel bars is coaxially arranged with another corresponding top plate protruding steel bar on another prefabricated top plate, and the length of each of the top plate protruding steel bars does not exceed half of the width of the wall joint surface;

[0020] The plurality of top plate outwardly extending steel bars on each top plate joint surface are respectively arranged in two inner and outer rows along the thickness direction of the top plate;

[0021] Each pair of the coaxially arranged top plate extending steel bars in the two outer rows of the two prefabricated top plates is provided with additional steel bars;

[0022] A plurality of transverse steel bars are arranged on the plurality of additional steel bars along the width direction of the trough structure;

[0023] Ultra-high performance concrete is poured into the trough structure to consolidate the precast wall, the two precast top plates, all the top plate protruding steel bars, all the wall protruding steel bars, all the additional steel bars and all the transverse steel bars into a whole.

[0024] Preferably, each of the additional steel bars is overlapped with the corresponding two top plate protruding steel bars.

[0025] Preferably, the lap length l between each of the additional steel bars and each of the corresponding top plate protruding steel bars is l The calculation formula is as follows:

[0026]

[0027] in, is the correction coefficient of the overlap length of the overhanging steel bars of the top plate;

[0028] ξ a is the anchorage length correction factor of the additional reinforcement;

[0029] α is the shape coefficient of the additional reinforcement;

[0030] f y is the design value of the steel bar yield strength of the top plate protruding steel bars;

[0031] f t is the design value of axial tensile strength of ultra-high performance concrete;

[0032] d is the nominal diameter of the protruding steel bars of the top plate.

[0033] Beneficial effects of the utility model:

[0034] The utility model uses post-cast ultra-high performance concrete to effectively reduce the length of the protruding steel bars of the slab and the wall extending into the node, can reduce the amount of ultra-high performance concrete used, does not need to consider the problem of steel bar avoidance during design, is easy to install, can shorten the project construction period, reduce construction risks, and has good social and economic benefits.

[0035] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic structural cross-sectional diagram of a prefabricated top plate in one embodiment of the utility model is shown.

[0037] Figure 2 A schematic structural cross-sectional diagram of a prefabricated wall in one embodiment of the utility model is shown.

[0038] Figure 3 A schematic cross-sectional view of the connection structure of the top plate protruding steel bars, the wall protruding steel bars, the additional steel bars and the transverse steel bars at the cross-sectional position of the trough structure in one embodiment of the utility model.

[0039] Figure 4 A schematic plan view of the connecting structure of the wall protruding steel bars, additional steel bars and transverse steel bars in the top view of the groove structure in one embodiment of the utility model is shown.

[0040] Figure 5 A schematic diagram showing a state in which a prefabricated top plate and a prefabricated wall are fixed by temporary supports in one embodiment of the utility model.

[0041] Figure 6 A schematic diagram showing a state in which additional reinforcement and transverse reinforcement are arranged in one embodiment of the utility model.

[0042] Figure 7 A schematic diagram showing a state in which ultra-high performance concrete is poured in one embodiment of the utility model.

[0043] Figure 8 A schematic diagram showing a state in which high performance concrete curing is completed and temporary supports are removed in one embodiment of the utility model. DETAILED DESCRIPTION

[0044] Example

[0045] like Figures 1 to 8 As shown, the post-cast ultra-high performance concrete structure between the precast top plate and the precast wall includes a precast top plate 1 and a precast wall 2.

[0046] Wherein, one side of the prefabricated wall 2 connected to the prefabricated top plate 1 is connected to two prefabricated top plates 1 located on both sides of the prefabricated wall 2;

[0047] The wall joint surface 22 where the prefabricated wall 2 is connected to the two prefabricated top plates 1, and the top plate joint surface 12 where each prefabricated top plate 1 is connected to the prefabricated wall 2 are roughened;

[0048] The two top plate joint surfaces 12 are located on both sides of the wall joint surface 22, forming a groove structure with a "concave" cross section;

[0049] A wall extension steel bar 21 perpendicular to the wall joint surface 22 is provided at a position near each prefabricated top plate 1;

[0050] The two top plate joint surfaces 12 of the two prefabricated top plates 1 are provided with a plurality of top plate outwardly extending steel bars 11 corresponding to each other;

[0051] Each top plate protruding steel bar 11 is coaxially arranged with another top plate protruding steel bar 11 corresponding to another prefabricated top plate 1, and the length of each of them does not exceed half of the width of the wall joint surface 22;

[0052] The plurality of top plate outwardly extending steel bars 11 of each top plate joint surface 12 are arranged in two inner and outer rows along the thickness direction of the prefabricated top plate 1;

[0053] Each pair of coaxially arranged top plate outriggers 11 in the two outer rows of top plate outriggers 11 of the two prefabricated top plates 1 is provided with additional reinforcements 3;

[0054] The two outer rows of top plate protruding steel bars 11 of the above-mentioned two prefabricated top plates 1 refer to the far prefabricated wall 2, one row each for the two prefabricated top plates 1 located on both sides of the prefabricated wall 2, that is, the row of top plate protruding steel bars 11 of one prefabricated top plate 1 farthest from the prefabricated wall 2 and the other row of top plate protruding steel bars 11 corresponding to the other prefabricated top plate 1.

[0055] A plurality of transverse steel bars 4 are arranged on the plurality of additional steel bars 3 along the width direction of the trough structure;

[0056] Ultra-high performance concrete 6 is poured in the trough structure to consolidate the precast wall 2, two precast top slabs 1, all top slab protruding steel bars 11, all wall protruding steel bars 21, all additional steel bars 3 and all transverse steel bars 4 into a whole.

[0057] The utility model uses post-cast ultra-high performance concrete 6 to consolidate the prefabricated wall 2, two prefabricated top plates 1, all top plate protruding steel bars 11, all wall protruding steel bars 21, all additional steel bars 3 and all transverse steel bars 4 into a whole, which can effectively reduce the length of the top plate protruding steel bars 11 and the wall protruding steel bars 21 extending into the node;

[0058] The use of the prefabricated top plate 1 can also reduce the amount of ultra-high performance concrete 6 used;

[0059] The length of the protruding steel bars 11 of the prefabricated top plate is less than half of the width of the node, that is, the length does not exceed half of the width of the wall joint surface 22, and there is no need to consider the problem of steel bar avoidance;

[0060] The additional steel bars 3 are overlapped and connected with the top plate protruding steel bars 11 serving as the longitudinal reinforcement of the prefabricated top plate surface, which is easy to install, can shorten the project construction period, reduce construction risks, and has good social and economic benefits.

[0061] In some embodiments, each additional steel bar 3 is overlapped with two corresponding top plate extending steel bars 11 .

[0062] In some embodiments, the lap length l between each additional steel bar 3 and each corresponding top plate protruding steel bar 11 is l The calculation formula is as follows:

[0063]

[0064] in, is the correction factor for the overlap length of the top plate protruding steel bars 11;

[0065] ξ a is the correction factor of the anchorage length of the additional reinforcement 3;

[0066] α is the shape coefficient of the additional reinforcement 3;

[0067] f y is the design value of the steel yield strength of the top plate protruding steel bars 11;

[0068] f t is the design value of the 6-axis tensile strength of ultra-high performance concrete;

[0069] d is the nominal diameter of the protruding steel bars 11 of the top plate.

[0070] The utility model also provides a method for post-casting ultra-high performance concrete structure between a prefabricated top plate and a prefabricated wall, comprising the following steps:

[0071] Step 1, manufacturing a prefabricated top plate 1 and a prefabricated wall 2, setting all the wall protruding steel bars 21 and all the top plate protruding steel bars 11 during the manufacturing process, and roughening the wall joint surface 22 and the top plate joint surface 12;

[0072] Step 2: put the prefabricated top plate 1 and prefabricated wall 2 in place, and install temporary supports 5 for temporary fixation;

[0073] Step 3, additional steel bars 3 are arranged between each pair of coaxially arranged top plate protruding steel bars 11, and all transverse steel bars 4 are arranged on the several additional steel bars 3 that have been arranged; ensure that all additional steel bars 3 and all transverse steel bars 4 are tied firmly;

[0074] Step 4, pouring ultra-high performance concrete 6 in the groove structure formed by the wall joint surface 22 and the top plate joint surface 12;

[0075] Step 5: After the curing of the ultra-high performance concrete 6 is completed, the temporary support 5 is removed.

[0076] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A post-cast ultra-high performance concrete structure between a prefabricated top plate and a prefabricated wall, comprising a prefabricated top plate (1) and a prefabricated wall (2); characterized in that: One side of the prefabricated wall (2) connected to the prefabricated top plate (1) is connected to two prefabricated top plates (1) located on both sides of the prefabricated wall (2); The wall joint surface (22) where the prefabricated wall (2) is connected to the two prefabricated top plates (1), and the top plate joint surface (12) where each prefabricated top plate (1) is connected to the prefabricated wall (2) are both roughened; The two top plate joint surfaces (12) are located on both sides of the wall joint surface (22), forming a groove structure with a concave cross-section; The wall joint surface (22) is provided with a wall extension steel bar (21) perpendicular to the wall joint surface (22) at a position close to each of the prefabricated top plates (1); The two top plate joint surfaces (12) of the two prefabricated top plates (1) are provided with a plurality of top plate extending steel bars (11) corresponding to each other; Each of the top plate protruding steel bars (11) is coaxially arranged with another corresponding top plate protruding steel bar (11) on another prefabricated top plate (1), and the length of each of the top plate protruding steel bars (11) does not exceed half the width of the wall joint surface (22); The plurality of top plate protruding steel bars (11) of each top plate joint surface (12) are arranged in two inner and outer rows along the thickness direction of the prefabricated top plate (1); Each pair of coaxially arranged top plate extending steel bars (11) in the two outer rows of the two prefabricated top plates (1) is provided with additional steel bars (3); A plurality of transverse steel bars (4) are arranged on the plurality of additional steel bars (3) along the width direction of the trough structure; Ultra-high performance concrete (6) is poured in the trough structure to consolidate the prefabricated wall (2), the two prefabricated top plates (1), all the top plate protruding steel bars (11), all the wall protruding steel bars (21), all the additional steel bars (3) and all the transverse steel bars (4) into a whole.

2. The post-cast ultra-high performance concrete structure between the prefabricated top plate and the prefabricated wall according to claim 1, characterized in that: Each of the additional steel bars (3) is overlapped and connected to the corresponding two top plate protruding steel bars (11).

3. The post-cast ultra-high performance concrete structure between the prefabricated top plate and the prefabricated wall according to claim 1, characterized in that: The lap length l between each of the additional steel bars (3) and each of the corresponding top plate protruding steel bars (11) is l The calculation formula is as follows: in, is the correction coefficient of the overlap length of the top plate protruding steel bars (11); ξ a is the anchorage length correction coefficient of the additional steel bar (3); α is the shape coefficient of the additional steel bar (3); f y is the design value of the steel bar yield strength of the top plate protruding steel bars (11); f t is the design value of axial tensile strength of ultra-high performance concrete (6); d is the nominal diameter of the top plate protruding steel bars (11).

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