Prefabricated plate type stair lower sliding support connecting node

Abstract

The utility model provides a prefabricated plate type stair lower sliding support connecting node which is characterized in that the plate end of a reinforced concrete floor is lapped at the left end of an upper flange of an H-shaped steel beam through haunching, a plurality of left-side shear-resistant studs are arranged at the lapped position of the upper flange of the H-shaped steel beam, and the tail end of a stressed steel bar in the floor is bent at the lapped position and is welded with the left-side shear-resistant studs; the prefabricated plate type staircase is in lap joint with the right end of the upper flange of the H-shaped steel beam, the lap joint of the upper flange of the H-shaped steel beam is leveled, a polyfluortetraethylene plate is laid, a plurality of right side anti-shear studs are further arranged at the lap joint, stud holes are reserved in the prefabricated plate type staircase, the right side anti-shear studs can be placed in the stud holes, and mortar is plugged in the stud holes; a plurality of spring assemblies are distributed in the cavity at equal intervals in the length direction of the beam, the cavity is filled with polyphenyl foam, and a structural sealant layer and a grouting layer are sequentially arranged at the upper end of the polyphenyl foam layer. On the basis that the use function of the stair is not affected, the stair can be separated from the main body structure, and the evacuation function of the assembly type building stair structure is prevented from being affected.

Description

Technical Field

[0001] The utility model relates to the field of construction, in particular to a sliding support connection node under a prefabricated plate-type staircase. Background Art

[0002] In the process of seismic design of prefabricated building structures, stair slabs are often considered as supports and cast together with the main structure. This can make up for the problem of insufficient lateral stiffness of the main structure to a certain extent, and is also part of the "second line of defense" for structural seismic resistance. However, when an earthquake comes, since the stairs absorb a large amount of seismic energy as a support, the damage to the stairs will block the escape route. As the evacuation part of the building, the function of the staircase as a life channel is undoubtedly more important. Therefore, it is necessary to separate the stairs from the main structure through node design, while not affecting its use function. Utility Model Content

[0003] In order to solve the above technical problems, the utility model proposes a sliding support connection node under a prefabricated plate staircase, which can disconnect the staircase from the main structure without affecting the use function of the staircase, thereby avoiding affecting the evacuation function of the prefabricated building staircase structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A prefabricated plate type staircase lower sliding support connection node, the structural features of which are:

[0006] The connection node between the reinforced concrete floor slab and the prefabricated slab staircase is supported by an H-shaped steel beam, with a gap between them to form a cavity; the end of the reinforced concrete floor slab is overlapped at the left end of the upper flange of the H-shaped steel beam by adding a 45-degree haunch, and the upper flange of the H-shaped steel beam is provided with multiple left-side shear studs distributed along the length of the beam at the overlap. The end of the stress-bearing steel bar in the floor slab forms an inverted right-angle trapezoidal bending structure without a bottom at the overlap, and the side facing the cavity is at a right angle and welded to the left-side shear stud;

[0007] The prefabricated slab staircase is overlapped at the right end of the upper flange of the H-shaped steel beam. The upper flange of the H-shaped steel beam is leveled at the overlap by cement mortar, and a polytetrafluoroethylene plate is laid on the formed leveling layer. The overlap is also provided with a plurality of right-side shear studs distributed at intervals along the length of the beam. The prefabricated slab staircase is provided with stud holes reserved according to the position distribution and outer dimensions of each right-side shear stud for the insertion of each right-side shear stud, and the stud holes are sealed with mortar;

[0008] Multiple groups of spring assemblies are distributed in the cavity at equal intervals along the length of the beam. Each group of spring assemblies consists of two low-damping springs that are distributed one above the other and horizontally supported in the cavity along the left and right directions. The cavity is filled with polystyrene foam from the bottom to the area above the spring assembly, and a structural sealant layer and a grouting layer are sequentially arranged on the upper end of the formed polystyrene foam layer.

[0009] The structural features of the utility model also lie in:

[0010] The thickness of the polytetrafluoroethylene plate is 5mm, and the upper flange of the H-shaped steel beam is leveled with cement mortar with a 1:1 ratio of cement and sand at the overlap with the prefabricated slab staircase.

[0011] The shear studs on the left are cast integrally with the reinforced concrete slab.

[0012] A 60mm wide gap is left between the reinforced concrete floor and the precast slab staircase.

[0013] The bolt holes are filled and sealed with C40 grouting material.

[0014] Compared with the prior art, the beneficial effects of the utility model are embodied in:

[0015] The utility model structurally separates the reinforced concrete floor slab from the prefabricated slab type staircase to form a cavity between the two, fills the cavity with elastic material, and arranges a low-damping spring to form a sliding support, while strengthening the connection between the reinforced concrete floor slab and the prefabricated slab type staircase and the H-shaped steel beam, and through the construction measures of the bolt holes and the shear bolts on the right side, it plays the effect of controlling the impact process between the structures when an earthquake occurs, thereby improving the safety of the structure, effectively ensuring the evacuation function of the prefabricated building staircase structure, reducing casualties, and solving the problem that the staircase parts of the prefabricated building are easily damaged under the action of an earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view structural schematic diagram of the utility model;

[0017] Figure 2 It is a top structural schematic diagram of the utility model.

[0018] In the figure, 1 is a reinforced concrete floor slab; 11 is a haunch; 12 is a stress-bearing steel bar; 2 is a prefabricated slab staircase; 21 is a leveling layer; 22 is a polytetrafluoroethylene plate; 23 is a bolt hole; 3 is an H-shaped steel beam; 31 is a left-side shear bolt; 32 is a right-side shear bolt; 4 is a cavity; 5 is a low-damping spring; 6 is a polystyrene foam layer; 7 is a structural sealant layer; and 8 is a grouting layer. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Please refer to Figure 1 to Figure 2 The structural setting of the connection node of the sliding support under the prefabricated plate-type staircase of this embodiment includes:

[0021] The connection node between the reinforced concrete floor 1 and the prefabricated slab staircase 2 is supported by an H-shaped steel beam 3, with a spacing between them to form a cavity 4; the plate end of the reinforced concrete floor 1 is overlapped at the left end of the upper flange of the H-shaped steel beam 3 through a 45-degree haunch 11, and the upper flange of the H-shaped steel beam 3 is provided with a plurality of left-side shear studs 31 distributed along the length of the beam at the overlap, and the end of the stress-bearing steel bar 12 in the floor forms an inverted right-angle trapezoidal bending structure without a bottom at the overlap, and the side facing the cavity 4 is at a right angle and is welded to the left-side shear stud 31;

[0022] The prefabricated plate type staircase 2 is overlapped at the right end of the upper flange of the H-shaped steel beam 3. The upper flange of the H-shaped steel beam 3 is leveled at the overlap by cement mortar. A polytetrafluoroethylene plate 22 is laid on the formed leveling layer 21. A plurality of right-side shear studs 32 are also arranged at the overlap at intervals along the length of the beam. The prefabricated plate type staircase 2 is provided with stud holes 23 reserved according to the position distribution and the outer dimensions of each right-side shear stud 32 for each right-side shear stud 32 to be inserted. The stud holes 23 are sealed with mortar.

[0023] Multiple groups of spring assemblies are distributed in the cavity 4 at equal intervals along the length of the beam. Each group of spring assemblies consists of two low-damping springs 5 ​​that are distributed one above the other and horizontally supported in the cavity 4 along the left and right directions. The cavity 4 is filled with polystyrene foam from the bottom to the area above the spring assembly, and a structural sealant layer 7 and a grouting layer 8 are sequentially arranged on the upper end of the formed polystyrene foam layer 6.

[0024] In the specific implementation, the corresponding structural settings also include:

[0025] The polytetrafluoroethylene plate 22 is 5 mm thick, and the upper flange of the H-shaped steel beam 3 is leveled at the overlap with the prefabricated plate type staircase 2 by cement mortar with a ratio of 1:1 between cement and sand.

[0026] The left side shear stud 31 is cast integrally with the reinforced concrete floor slab 1.

[0027] A 60 mm wide gap is left between the reinforced concrete floor 1 and the prefabricated slab type staircase 2 .

[0028] The bolt hole 23 is filled and sealed with C40 grouting material.

[0029] The overall upper end surface of the node is flat.

[0030] The construction can be carried out in the following manner:

[0031] a. A left shear bolt 31 is arranged at the left end of the upper flange of the H-shaped steel beam 3, and is cast together with the reinforced concrete floor 1 during formwork casting to increase the connection strength with the floor; the stress-bearing steel bars 12 in the reinforced concrete floor 1 are bent and welded at the overlap with the H-shaped steel beam 3, and the reinforced concrete floor 1 is subjected to a 45-degree haunch 11 treatment at the overlap;

[0032] b. A hole is opened in advance at the platform plate of the prefabricated plate-type staircase 2 as a bolt hole 23. The right side shear bolt 32 is welded to the right end of the upper flange of the H-shaped steel beam 3, and the upper surface of the upper flange is leveled with 1:1M15 cement mortar. A 5mm thick polytetrafluoroethylene plate 22 is laid on the upper part. The sliding coefficient of the plate is extremely small and can play the role of a sliding support. The prefabricated plate-type staircase 2 is placed in position to align with the bolt hole 23, and the hole is sealed with mortar, and the surface should be flat and smooth. Under the action of horizontal earthquakes, the lateral displacement of the staircase plate will be limited by the bolt and hole size, and the impact process between the structures is controlled by the structural measures of the right side shear bolt 32 and the bolt hole 23;

[0033] c. A 60mm wide space is set between the reinforced concrete floor 1 and the prefabricated slab staircase 2 by size control, and the interior is filled with polystyrene foam. Multiple groups of spring assemblies are set up using low-damping springs 5. Finally, structural sealant is applied and the top is filled with grout.

[0034] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A prefabricated plate-type staircase lower sliding support connection node, characterized by: The connection node between the reinforced concrete floor slab and the prefabricated slab staircase is supported by an H-shaped steel beam, with a gap between them to form a cavity; the end of the reinforced concrete floor slab is overlapped at the left end of the upper flange of the H-shaped steel beam by adding a 45-degree haunch, and the upper flange of the H-shaped steel beam is provided with multiple left-side shear studs distributed along the length of the beam at the overlap. The end of the stress-bearing steel bar in the floor slab forms an inverted right-angle trapezoidal bending structure without a bottom at the overlap, and the side facing the cavity is at a right angle and welded to the left-side shear stud; The prefabricated slab staircase is overlapped at the right end of the upper flange of the H-shaped steel beam. The upper flange of the H-shaped steel beam is leveled at the overlap by cement mortar, and a polytetrafluoroethylene plate is laid on the formed leveling layer. The overlap is also provided with a plurality of right-side shear studs distributed at intervals along the length of the beam. The prefabricated slab staircase is provided with stud holes reserved according to the position distribution and outer dimensions of each right-side shear stud for the insertion of each right-side shear stud, and the stud holes are sealed with mortar; Multiple groups of spring assemblies are distributed in the cavity at equal intervals along the length of the beam. Each group of spring assemblies consists of two low-damping springs that are distributed one above the other and horizontally supported in the cavity along the left and right directions. The cavity is filled with polystyrene foam from the bottom to the area above the spring assembly, and a structural sealant layer and a grouting layer are sequentially arranged on the upper end of the formed polystyrene foam layer.

2. The prefabricated plate type staircase lower sliding support connection node according to claim 1 is characterized in that: The shear studs on the left are cast integrally with the reinforced concrete slab.

3. The prefabricated plate type staircase lower sliding bearing connection node according to claim 1 is characterized in that: A 60mm wide gap is left between the reinforced concrete floor and the precast slab staircase.

4. The prefabricated plate type staircase lower sliding bearing connection node according to claim 1 is characterized in that: The bolt holes are filled and sealed with C40 grouting material.

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