A precast slab and cast-in-situ beam connecting joint

Abstract

The utility model discloses a prefabricated slab and concrete cast-in-situ beam connecting joint, including reinforced concrete prefabricated slab and reinforced concrete cast-in-situ beam, its characterized in that, the both ends of reinforced concrete prefabricated slab are installed and are embedded steel plate, the reinforced concrete cast-in-situ beam is embedded in the embedded steel plate one and the embedded steel plate two of reinforced concrete cast-in-situ beam in the reinforced concrete prefabricated slab rest position, the embedded steel plate is welded with the embedded steel plate one and the embedded steel plate two of reinforced concrete cast-in-situ beam, compared with traditional practice, the difficult problem of slope roof formwork complex, concrete pouring quality is difficult to guarantee is solved, improves the field construction efficiency, reduces the labor input, shortens the construction period, energy -concerving and environment -protective, saves installation cost, reaches the purpose of improving quality, economy and social etc. Comprehensive benefit.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, and in particular to a connection node between a precast slab and a cast-in-place concrete beam. Background Technology

[0002] In recent years, as the construction industry has continuously raised its standards for the aesthetics of roof design and waterproofing and insulation performance, pitched roofs have become increasingly widely used in residential buildings.

[0003] Traditional methods for constructing reinforced concrete pitched roofs typically involve using wooden formwork and steel pipe supports, which takes a long time to erect. During pouring, workers usually stand on the reinforcing steel bars of the sloping roof slab, posing a significant risk of working at height. Due to the steep slope, the pouring sequence and slump of the concrete must be strictly controlled; otherwise, cold joints and insufficient compaction can easily occur, making it difficult to guarantee the quality. Utility Model Content

[0004] The purpose of this utility model is to provide a connection node between a precast slab and a cast-in-place concrete beam, which solves the problem that the traditional method of constructing reinforced concrete sloping roofs generally uses wooden formwork and steel pipe support frames, which has a long formwork erection period and poses a great risk of high-altitude operation for workers who usually stand on the steel reinforcement of the sloping roof slab during pouring.

[0005] To achieve the above objectives, a connection node between a precast slab and a cast-in-place concrete beam is provided, comprising a precast reinforced concrete slab and a cast-in-place reinforced concrete beam. Embedded steel plates are installed at both ends of the precast reinforced concrete slab. Two embedded steel plates are pre-embedded in the cast-in-place reinforced concrete beam at the support positions of the precast reinforced concrete slab. The embedded steel plates are welded to the two embedded steel plates. Fine aggregate concrete sealant is applied to the gaps in the precast reinforced concrete slab, and the sealant is applied layer by layer.

[0006] According to the aforementioned connection node between a precast slab and a cast-in-place concrete beam, both the reinforced concrete precast slab and the embedded steel plate are factory-prefabricated components.

[0007] According to the aforementioned connection node between a precast slab and a cast-in-place concrete beam, after the reinforcement is tied, a first embedded steel plate and a second embedded steel plate are installed on the cast-in-place concrete beam according to the placement position of the precast concrete slab. The precast concrete slab can only be hoisted after the concrete has been poured and reached its strength.

[0008] According to the aforementioned connection node between a precast slab and a cast-in-place concrete beam, the precast reinforced concrete slab and the precast steel plate embedded in the cast-in-place reinforced concrete beam are also welded together.

[0009] According to the aforementioned connection node between a precast slab and a cast-in-place concrete beam, the fine aggregate concrete sealant is premixed concrete.

[0010] The above-mentioned solution has the following beneficial effects:

[0011] 1. By using a connection method of pre-embedded steel plate welding, the precast reinforced concrete slab and the cast-in-place concrete beam roof truss are integrated into one unit, realizing the prefabricated construction of pitched roof panels on site. Compared with the traditional method, this solves the problems of complex formwork for pitched roofs, high-altitude operation hazards, and difficulty in guaranteeing concrete quality. It improves on-site construction efficiency, reduces high-altitude operation hazards, shortens the construction period, saves energy and protects the environment, and saves installation costs, thereby achieving the goal of improving comprehensive benefits in terms of quality, economy, and society.

[0012] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a cross-sectional view of a precast reinforced concrete slab connecting a precast slab to a cast-in-place concrete beam according to the present invention.

[0015] Figure 2 This is a cross-sectional view of a connection node between a precast slab and a cast-in-place concrete beam according to the present invention.

[0016] Legend:

[0017] 1. Precast reinforced concrete slab; 11. Embedded steel plate; 2. Cast-in-place reinforced concrete beam; 21. Embedded steel plate one on cast-in-place reinforced concrete beam; 22. Embedded steel plate two on cast-in-place reinforced concrete beam; 3. Fine aggregate concrete sealant. Detailed Implementation

[0018] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0019] Reference Figure 1-2This utility model embodiment provides a connection node between a precast slab and a cast-in-place concrete beam, including a precast reinforced concrete slab 1 and a cast-in-place reinforced concrete beam 2. Pre-embedded steel plates 11 are installed at both ends of the precast reinforced concrete slab 1. A first pre-embedded steel plate 21 and a second pre-embedded steel plate 22 are pre-embedded in the cast-in-place reinforced concrete beam at the support position of the precast reinforced concrete slab 1. The pre-embedded steel plates 11 are welded to the first and second pre-embedded steel plates 21 and 22. Fine aggregate concrete sealant 3 is applied to the gaps in the precast reinforced concrete slab 1, and the fine aggregate concrete sealant 3 is applied layer by layer to complete the prefabricated pitched roof.

[0020] Both the precast reinforced concrete slab 1 and the embedded steel plate 11 are prefabricated components in the factory. The embedded steel plate 11 and the embedded steel plate 22 on the cast-in-place reinforced concrete beam serve as the support surface for the precast steel plate 11. The size of the embedded steel plates 11 at both ends is not less than 150×200×8, and the anchor bars are not less than 2φ14. The embedded steel plate in the middle part is not less than 200×200×8, and the anchor bars are not less than 4φ14. The welds connecting the steel plates should be flat and full, and there should be no quality defects such as cracks, weld beads, arc craters, undercut, or electrical scratches. Ultrasonic testing should be performed on the first and second grade welds on site.

[0021] Based on the placement position of the precast reinforced concrete slab 1, after the reinforcement is tied, pre-embedded steel plates 21 and 22 are installed on the cast-in-place reinforced concrete beam 2. The precast reinforced concrete slab 1 can only be hoisted after the concrete has been poured and reached its strength. The precast reinforced concrete slab 1 is welded to the pre-embedded steel plates 21 and 22 on the cast-in-place reinforced concrete beam 2. Fine aggregate concrete joint filler is then applied. 3. For pre-mixed concrete, before sealing the slab joints, the bottom of the joints should be filled with extruded polystyrene board with a width of not less than 30mm to prevent grout leakage. During sealing, the fine aggregate concrete should be thoroughly mixed and filled into the joints in layers, with each layer compacted using reinforcing bars or wooden strips to ensure a firm bond between the sealing material and the joint walls. The placement location mentioned in this patent refers to the support point where the precast slab is placed on the cast-in-place beam. Furthermore, the fine aggregate concrete sealant 3 uses C20 fine aggregate concrete, mixed with DH-A concrete expansion agent at a dosage of 31kg / m³. 3 .

[0022] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A connection node between a precast slab and a cast-in-place concrete beam, comprising a precast reinforced concrete slab (1) and a cast-in-place reinforced concrete beam (2), characterized in that, The precast reinforced concrete slab (1) has embedded steel plates (11) installed at both ends. The cast-in-place reinforced concrete beam (2) has embedded steel plate one (21) and steel plate two (22) in the position where the precast reinforced concrete slab (1) is placed. The embedded steel plates (11) are welded to the steel plate one (21) and steel plate two (22) in the cast-in-place reinforced concrete beam. Fine stone concrete sealant (3) is placed in the gaps of the precast reinforced concrete slab (1) and is filled in layers.

2. The connection node between a precast slab and a cast-in-place concrete beam according to claim 1, characterized in that, Both the reinforced concrete precast slab (1) and the embedded steel plate (11) are prefabricated components produced in the factory.

3. The connection node between a precast slab and a cast-in-place concrete beam according to claim 1, characterized in that, According to the placement position of the precast reinforced concrete slab (1), after the reinforcement is tied, the first precast steel plate (21) and the second precast steel plate (22) are installed on the precast reinforced concrete beam (2). The precast reinforced concrete slab (1) can be hoisted after the concrete is poured and reaches the required strength.

4. The connection node between a precast slab and a cast-in-place concrete beam according to claim 1, characterized in that, The precast reinforced concrete slab (1) and the precast steel plate 1 (21) and the precast steel plate 2 (22) on the cast-in-place reinforced concrete beam (2) are welded in the same way.

5. The connection node between a precast slab and a cast-in-place concrete beam according to claim 1, characterized in that, The fine stone concrete sealant (3) is a pre-mixed concrete.

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