Connecting structure of steel corbel and concrete modular building stair

Abstract

The utility model discloses a connecting structure of a steel corbel and a concrete modularized building stair, which comprises a concrete building module, the steel corbel, a bent anchor steel bar and a prefabricated stair, an embedded part is embedded in the concrete building module, the embedded part comprises an embedded steel plate and an anchor bar, the embedded steel plate is fixed at the outer side end of the anchor bar, and the embedded steel plate is fixed at the outer side end of the anchor bar. The anchor bars are embedded in concrete of the concrete building module, and the outer side face of the embedded steel plate is exposed out of the inner side face of the wall of the concrete building module. The steel corbel comprises a connecting plate and a top plate, the bottom end of the bent anchor steel bar is provided with a bent section, and the bent section is welded to the top plate. Pin holes are reserved in the prefabricated stairs, the bent anchor steel bars are inserted into the pin holes, and high-strength grouting materials are filled between the bent anchor steel bars and the inner walls of the pin holes. The connecting structure can realize quick and convenient connection of the stairs, and improves the construction efficiency; and the integrality and the safety of the stair structure can be effectively improved.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated buildings, and in particular relates to a connection structure between a steel bracket and a modular concrete building staircase. Background Technology

[0002] With the development of industrialized construction, modular concrete buildings have been increasingly widely used in the construction field due to their advantages such as fast construction speed, easy quality control, and environmental friendliness. In modular concrete buildings, staircases, as important vertical transportation components, require structural safety and ease of construction.

[0003] Traditional concrete staircase construction methods typically involve on-site casting, which suffers from long construction periods, high labor intensity, and difficulty in guaranteeing quality. To address these issues, modular concrete staircases have emerged. Modular concrete staircases are constructed by dividing the staircase into several modules, prefabricating them in a factory, and then transporting them to the site for assembly. This method significantly improves construction efficiency, reduces on-site work, and enhances the safety and quality of the staircase.

[0004] However, achieving reliable connections between modules is a crucial issue during the assembly of modular concrete staircases. Currently, common connection methods include bolted connections and welded connections. While these methods can meet connection requirements to some extent, they also have drawbacks. For example, bolted connections require pre-drilled bolt holes in the modules, which weakens their structural strength; welded connections require on-site welding operations, which are more difficult to perform and whose welding quality is harder to guarantee. Utility Model Content

[0005] The purpose of this utility model is to provide a connection structure between steel brackets and modular concrete building stairs, which can realize the quick and convenient connection of stairs, improve construction efficiency, and effectively improve the integrity and safety of the stair structure.

[0006] This utility model is implemented as follows: a connection structure between a steel bracket and a modular concrete building staircase includes a concrete building module, a steel bracket, bent anchor bars, and a prefabricated staircase. The concrete building module has embedded parts, which include embedded steel plates and anchor bars. The embedded steel plates are fixed to the outer end of the anchor bars, and the anchor bars are embedded in the concrete of the concrete building module. The outer side of the embedded steel plates protrudes from the inner side of the wall of the concrete building module.

[0007] The steel bracket includes a connecting plate and a top plate, the top plate being fixed to the top surface of the connecting plate, and the connecting plate being welded to the embedded steel plate;

[0008] The bottom end of the bent anchor bar has a bent section, which is welded to the top surface of the top slab; the end of the precast staircase has a pre-drilled pin hole, the bent anchor bar is inserted into the pin hole, and high-strength grout is filled between the bent anchor bar and the inner wall of the pin hole.

[0009] Furthermore, the top of the pin hole is provided with an annular step, the periphery of the bent anchor bar has external threads, a locking block is placed on the annular step, and the bent anchor bar passes upward through the locking block and is connected to the fixing bolt.

[0010] Furthermore, the space above the card block is filled with micro-expansion waterproof mortar.

[0011] Furthermore, the steel bracket also includes a stiffening plate, the top surface of which is welded to the bottom surface of the top plate, and the inner side of which is welded to the outer side of the connecting plate.

[0012] Furthermore, a rubber gasket is sandwiched between the bottom surface of the precast stair end and the top plate, and the gap between the bottom surface of the stair end and the top plate is filled with mortar.

[0013] Furthermore, a certain cavity is reserved between the end face of the precast staircase and the inner side of the concrete building formwork wall. The cavity is filled with high-strength grout, and a PE rod and sealant are sandwiched at the top of the cavity.

[0014] Furthermore, the top surface of the prefabricated staircase is covered with a leveling layer.

[0015] Compared with the prior art, this utility model has the following advantages:

[0016] 1. Improved construction efficiency: On the construction site, after the precast stairs are hoisted into place, the pre-reserved pin holes on the precast stairs are aligned with the bent anchor bars on the steel brackets, and high-strength grout is poured into the gap between the pin holes and the bent anchor bars. This allows for the assembly and connection of the precast stairs and concrete building modules, reducing on-site construction procedures and shortening the construction cycle.

[0017] 2. Enhanced structural stability: The steel brackets are welded to the embedded parts of the concrete building modules, and the precast stairs are connected to the bent anchor bars welded to the steel brackets. The connection between the components is firm, which effectively improves the overall stability and safety of the stair structure and the main structure.

[0018] 3. Reduced construction difficulty: Steel brackets can be welded and fixed to the embedded parts of the concrete building modules in the factory. Bent anchor bars can also be welded and fixed to the steel brackets in the factory. The pin holes for prefabricated stairs can be formed during factory molding. All major components can be produced in the factory, reducing the complexity of on-site construction. Furthermore, the standardized design of the steel brackets also facilitates rapid installation and adjustment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a connection structure between a steel bracket and a modular concrete building staircase provided in an embodiment of this utility model;

[0020] Figure 2 yes Figure 1 A longitudinal sectional view of the connection structure shown.

[0021] Figure 3 This is a three-dimensional structural diagram of the steel bracket provided in this embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the steel bracket and the embedded parts of the concrete building module after welding, as provided in this embodiment of the utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "installation," "connection," and "joining" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0025] Currently, common connection methods used in the assembly of modular concrete staircases include bolted connections and welded connections. While these methods can meet the connection requirements to a certain extent, they also have some drawbacks. For example, bolted connections require pre-drilled bolt holes in the modules, which weakens the structural strength of the modules; welded connections require on-site welding operations, which are more difficult to construct and the welding quality is hard to guarantee.

[0026] To address the above technical problems, this embodiment provides a connection structure between a steel bracket and a modular concrete building staircase, referring to... Figure 1 and Figure 2 The connecting structure includes a concrete building module 1, a steel bracket 2, bent anchor bars 3, and a prefabricated staircase 4. The concrete building module 1 has embedded parts, including an embedded steel plate 51 and an anchor bar 52. The embedded steel plate 51 is welded and fixed to the outer end of the anchor bar 52, which is embedded in the concrete of the concrete building module 1. The outer surface of the embedded steel plate 51 protrudes from the inner surface of the wall of the concrete building module 1.

[0027] Reference Figure 3 The steel bracket 2 includes a connecting plate 21, a top plate 22, and a stiffening plate 23. The top plate 22 is fixed on the top surface of the connecting plate 21. The connecting plate 21 is welded to the pre-embedded steel plate 51. The top surface of the stiffening plate 23 is welded to the bottom surface of the top plate 22. The inner side of the stiffening plate 23 is welded to the outer side of the connecting plate 21.

[0028] The bottom end of the bent anchor bar 3 has a bent section, which is parallel to the top surface of the top plate 22 and is welded and fixed to the top surface of the top plate 22.

[0029] The end of the precast staircase 4 has a pre-drilled hole 41, the bent anchor steel bar 3 is inserted into the hole 41, and the space between the bent anchor steel bar 3 and the inner wall of the hole 41 is filled with high-strength grout 6.

[0030] Furthermore, the top of the dowel hole 41 is enlarged to form an annular step, and the periphery of the bent anchor bar 3 has external threads. In this embodiment, the bent anchor bar 3 uses an M16 bolt. A retaining block 7 is placed on the annular step, and the bent anchor bar 3 passes upward through the retaining block 7 and is connected to the fixing nut 8.

[0031] The space above the locking block 7 in the pin hole 41 is filled with micro-expansion waterproof mortar 9.

[0032] A rubber gasket a is sandwiched between the bottom surface of the end of the precast staircase 4 and the top plate 22, and a high-strength mortar b is filled in the gap between the bottom surface of the end of the precast staircase 4 and the top plate 22.

[0033] A cavity is reserved between the end face of the precast staircase 4 and the inner side of the wall of the concrete building module 1. The cavity is filled with high-strength grout, and a PE rod c and sealant d are sandwiched at the top of the cavity.

[0034] Furthermore, the top surface of the prefabricated staircase 4 is covered with a leveling layer e.

[0035] To make the technical solution of this embodiment clearer, this embodiment also provides a construction method for the above-mentioned connection structure, including the following steps:

[0036] When fabricating the concrete building module 1 structure in the factory, the anchor bars 52 of the pre-embedded steel plate 51 are fixed in the structure according to the positions shown in the design drawings. After the surface layer of the pre-embedded steel plate 51 is poured with the concrete, it is ensured to be flush with the concrete. A surface layer for welding with the steel bracket 2 is reserved before concrete pouring, ensuring that the dimensions and quality of the module meet the design requirements. A pin hole 41 for connection with the steel bracket 2 is reserved at the predetermined position of the module.

[0037] The anchorage depth of anchor bar 52 shall not be less than 35 times the diameter of the anchor bar.

[0038] Once the concrete building module 1 reaches the required strength, the steel bracket 2 can be welded to the embedded steel plate 51.

[0039] First, cut the connecting plate 21, top plate 22, and stiffening plate 23 of the steel bracket 2 according to the design dimensions.

[0040] The top plate 22 and connecting plate 21 of the steel bracket 2 are welded together by fillet weld, and then the stiffening plate 23 is welded together.

[0041] After the steel bracket 2 is processed, it is welded to the embedded steel plate 51 of the concrete building module 1 by fillet weld, with a weld gap of 8mm. After welding, as shown... Figure 4 As shown.

[0042] The precast staircase 4 is placed in the hoisting position using a special transport vehicle. After the precast staircase 4 is hoisted into position using a crane with the appropriate technical tonnage, the operator stabilizes the precast staircase 4 and slowly lowers it according to the horizontal control line. The precast staircase 4 is aligned with the reserved bent anchor steel bar 3 and installed in the design position. The gap between the bent anchor steel bar 3 and the pin hole 41 is filled with high-strength grout 6 into the enlarged groove of the pin hole 41. The pin hole 41 of the precast staircase 4 is fixed with a clip 7 and a fixing nut 8. The gap in the pin hole 41 is filled with high-strength grout 6 for dense filling.

[0043] Before the precast staircase 4 is unhooked during hoisting, rubber pads a are used to locally adjust the flatness between the precast staircase 4 and the steel bracket 2. After leveling, high-strength mortar b is used for mortar fixation.

[0044] Construction joint treatment is carried out at the connection between steel bracket 2 and concrete building module 1 to ensure the strength and stability of the connection. The exposed part of steel bracket 2 is coated with anti-corrosion paint and anti-rust paint.

[0045] When installing the precast staircase 4, a gap of 20-30mm is reserved between it and the concrete building module 1. The gap has a cavity, which is filled with PE rod c and sealant d. The building surface is leveled with cement mortar.

[0046] In summary, the connection structure of this embodiment has the following beneficial effects:

[0047] 1. Improve construction efficiency: On the construction site, after the precast staircase 4 is hoisted into place, the pre-reserved pin holes 41 on the precast staircase 4 are aligned and fixed to the bent anchor steel bars 3 on the steel bracket 2, and the gap between the pin holes 41 and the bent anchor steel bars 3 is filled with high-strength grout 6, which can realize the assembly and connection of the precast staircase 4 and the concrete building module 1. The on-site construction procedures are reduced and the construction cycle is shortened.

[0048] 2. Enhanced structural stability: The steel bracket 2 is welded to the embedded parts of the concrete building module 1, and the precast staircase 4 is inserted into the bent anchor steel bar 3 welded to the steel bracket 2. The connection between the components is firm, which effectively improves the overall stability and safety of the staircase structure and the main structure.

[0049] 3. Reduced construction difficulty: The steel bracket 2 can be welded and fixed to the embedded parts of the concrete building module 1 in the factory, and the bent anchor steel bar 3 can also be welded and fixed to the steel bracket 2 in the factory. The pin hole 41 of the precast staircase 4 can be formed in the factory. The main components can all be produced in the factory, reducing the complexity of on-site construction. In addition, the standardized design of the steel bracket can also facilitate rapid installation and adjustment.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A connection structure between a steel bracket and a modular concrete building staircase, characterized in that, The system includes concrete building modules, steel brackets, bent anchor bars, and prefabricated stairs. The concrete building modules have embedded parts, which include embedded steel plates and anchor bars. The embedded steel plates are fixed to the outer ends of the anchor bars, and the anchor bars are embedded in the concrete of the concrete building modules. The outer side of the embedded steel plates protrudes from the inner side of the wall of the concrete building modules. The steel bracket includes a connecting plate and a top plate, the top plate being fixed to the top surface of the connecting plate, and the connecting plate being welded to the embedded steel plate; The bottom end of the bent anchor bar has a bent section, which is welded to the top surface of the top slab; the end of the precast staircase has a pre-drilled pin hole, the bent anchor bar is inserted into the pin hole, and high-strength grout is filled between the bent anchor bar and the inner wall of the pin hole.

2. The connection structure according to claim 1, characterized in that, The top of the pin hole is provided with an annular step, the periphery of the bent anchor bar has external threads, a locking block is placed on the annular step, and the bent anchor bar passes upward through the locking block and is connected to the fixing bolt.

3. The connection structure according to claim 2, characterized in that, The pin hole is filled with micro-expansion waterproof mortar in the space above the card block.

4. The connection structure according to claim 1, characterized in that, The steel bracket also includes a stiffening plate, the top surface of which is welded to the bottom surface of the top plate, and the inner side of which is welded to the outer side of the connecting plate.

5. The connection structure according to claim 1, characterized in that, A rubber gasket is sandwiched between the bottom surface of the precast stair end and the top slab, and the gap between the bottom surface of the stair end and the top slab is filled with mortar.

6. The connection structure according to claim 1, characterized in that, A cavity is reserved between the end face of the precast staircase and the inner side of the concrete building formwork wall. The cavity is filled with high-strength grout, and a PE rod and sealant are sandwiched at the top of the cavity.

7. The connection structure according to claim 1, characterized in that, The top surface of the prefabricated staircase is covered with a leveling layer.

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