Fabricated air-void sandwich plate structure and construction method thereof

Abstract

This invention provides a prefabricated hollow sandwich panel structure and its construction method, belonging to the field of building construction. The technical solution includes a scaffolding support system, supporting joists installed on the scaffolding support system, and a combined hollow sandwich panel structure installed on the supporting joists. The combined hollow sandwich panel structure includes combined lower rib beams installed on the supporting joists, precast cross-shaped shear keys installed on the combined lower rib beams, precast upper rib beams installed on adjacent precast cross-shaped shear keys, and precast composite slabs installed between adjacent precast upper rib beams. The beneficial effects of this invention are: This invention prefabricates various components, allows for small-scale vibration compaction, ensuring concrete quality; further utilizes the temporary support capacity of U-shaped steel to support the upper structure; and creatively proposes a support system for the upper structure, simplifying the support system, enabling rapid material turnover, increasing working space, and shortening the construction cycle.

Description

Technical Field

[0001] This invention relates to the field of construction, and more particularly to a prefabricated hollow sandwich panel structure and its construction method. Background Technology

[0002] Composite hollow sandwich panel structures are a type of large-span structure that has emerged in recent years. Traditional multi-layer large-span composite hollow sandwich panels are widely used, but many construction challenges arise during actual construction. 1. Cast-in-place U-shaped steel-concrete composite hollow sandwich slab structures have problems such as numerous support systems and slow mold turnover. Among them, the cross-shaped shear key, upper rib beam and slab support system are complex and pose safety hazards. There are many hollow scaffolds and the working space is small, making it impossible for workers to stand and work, which affects construction efficiency. 2. Cast-in-place U-shaped steel-concrete composite hollow sandwich slab structures have the disadvantage of requiring a large amount of on-site welding work. 3. During the secondary pouring of concrete in the floor slab structure, the dense shear key reinforcement makes vibration difficult, resulting in concrete damage verification and difficulty in ensuring quality. 4. The existing construction method is generally on-site casting. The shear key reinforcement is placed on the top of the U-shaped steel and then cast as a whole. After the concrete strength reaches 100%, the formwork is removed (which takes about 20 days), and then the upper rib beam and floor slab are cast. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated hollow sandwich panel structure and its construction method that prefabricates the components, performs small-scale vibration to ensure concrete quality, further utilizes the temporary support capacity of U-shaped steel to support the superstructure, and creatively proposes a support system for the superstructure to simplify the support system, quickly turn over materials and tools, increase the working space, and shorten the construction cycle.

[0004] This invention is achieved through the following measures: A prefabricated hollow sandwich panel structure, characterized in that it includes a scaffolding support system and a support keel set on the scaffolding support system, wherein a combined hollow sandwich panel structure is set on the support keel; The combined hollow sandwich panel structure includes a combined lower rib beam disposed on the supporting keel, a cross-shaped precast shear key disposed on the combined lower rib beam, a precast upper rib beam disposed on the adjacent cross-shaped precast shear key, and a precast composite slab disposed between the adjacent precast upper rib beams.

[0005] The invention also has the following specific features: The combined lower rib beam is composed of several U-shaped steels spliced ​​together. Four adjacent U-shaped steels are fixedly connected by cross connectors to form a cross steel frame. The four cross steel frames form a closed steel frame. Adjacent cross steel frames are fixedly connected by connecting plates.

[0006] The inner walls on both sides of the U-shaped steel end are provided with a number of limiting cylinders, and the corresponding limiting cylinders are provided with tie bars; Preferably, a new type of wedge-type tie bar is used, which reduces the amount of rebar tied.

[0007] An L-shaped stiffening rib is provided at the outer corner of the cross steel frame. Several through mounting holes are provided on one side wall of the L-shaped stiffening rib and the U-shaped steel. Several threaded cylinders are provided on the inner side of the other side wall of the U-shaped steel corresponding to the mounting holes. Pull-through reinforcing bolts are provided in the corresponding threaded cylinders and mounting holes.

[0008] Several internal supports are provided between the precast cross shear key and the combined lower rib beam. The precast cross-shaped shear key has several threaded connecting cylinders embedded in its side. The U-shaped steel sidewall has mounting threaded holes corresponding to the positions of the threaded connecting cylinders. Both ends of the internal support are bolted to the threaded connecting cylinders and the sidewall of the U-shaped steel.

[0009] The four sides of the precast cross-shaped shear key are temporarily supported by several precast shear keys through bolts. The precast upper rib beam is provided between the temporary supports of the precast shear keys adjacent to the cross-shaped precast shear keys.

[0010] The precast upper rib beam is provided with temporary supports on both sides, and a precast composite slab is provided between adjacent temporary supports of the precast upper rib beam.

[0011] The supporting keel includes several main keels and several secondary keels installed on the scaffolding support system; Preferably, a primary and secondary keel support system is adopted, with primary and secondary keels erected orthogonally on the upper side of the scaffolding support system, and a working platform erected on the upper side of the primary keel.

[0012] The construction method includes the following steps: S1. First, install the scaffolding support system. Place the main keel at the support point of the scaffolding support system, place the secondary keel orthogonally above the main keel, and place the steel plate above the secondary keel as a working platform during installation. S2. Place several cross steel frames connected by cross connectors on the secondary keel. The adjacent U-shaped steels are fixedly connected by connecting plates. Reinforcing bars are laid inside the adjacent cross steel frames. Then, the cross prefabricated shear key is hoisted onto the cross steel frame, ensuring that the reinforcing bar anchoring end of the cross prefabricated shear key enters the interior of the cross steel frame. Then, the reinforcing bars laid inside the cross steel frame are tied and fixed. At the same time, the tie bolts are installed in the corresponding installation threaded cylinder and the installation hole. The internal support is installed on the cross prefabricated shear key and the combined lower rib beam. Then, the combined lower rib beam concrete is poured. S3. After the concrete of the combined lower rib beam is cured and formed, the precast upper rib beam is placed on the temporary support of the precast shear key adjacent to the cross precast shear key. The precast composite slab is placed on the temporary support of the upper rib beam on the adjacent precast upper rib beam. Then, a formwork is erected at the intersection of the anchorage end of the precast upper rib beam reinforcement and the anchorage end of the top reinforcement of the cross precast shear key, and the top concrete is poured. During the pouring, the edge of the combined lower rib beam is closed. S4. After the top concrete is formed, the internal supports are removed, and the precast shear keys and upper rib beams are used for temporary support.

[0013] The beneficial effects of this invention are as follows: This invention prefabricates the components and performs vibration on a small scale, which ensures the quality of concrete. Furthermore, it utilizes the temporary support capacity of U-shaped steel to support the superstructure and creatively proposes a support system for the superstructure, which simplifies the support system, allows for rapid turnover of materials and tools, increases the working space, and shortens the construction cycle. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the scaffolding support system in an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the cross-shaped steel frame in an embodiment of the present invention.

[0017] Figure 4 This is a schematic diagram of the prefabricated upper rib beam in an embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of the combined hollow sandwich panel structure in an embodiment of the present invention.

[0019] The attached diagram is labeled as follows: 1. Scaffolding support system; 2. Main keel; 3. Secondary keel; 4. Combined lower rib beam; 5. U-shaped steel; 502. Limiting insert; 503. Tie bar; 504. Limiting column; 6. Installation threaded cylinder; 601. Tie bar reinforcing bolt; 7. L-shaped stiffening rib; 8. Cross connecting plate; 9. Precast shear key; 10. Internal support; 11. Precast shear key temporary support; 12. Precast upper rib beam; 13. Precast upper rib beam temporary support; 14. Precast composite slab. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0021] See Figure 1-5 A prefabricated hollow sandwich panel structure includes a scaffolding support system 1 and a support keel set on the scaffolding support system 1, with a combined hollow sandwich panel structure set on the support keel. The composite hollow sandwich panel structure includes a composite lower rib beam 4 set on the supporting keel, a cross precast shear key 9 set on the composite lower rib beam 4, a precast upper rib beam 12 set on adjacent cross precast shear key 9, and a precast composite slab 14 set between adjacent precast upper rib beams 12.

[0022] The combined lower rib beam 4 is composed of several U-shaped steels 5 spliced ​​together. Four adjacent U-shaped steels 5 are fixedly connected by cross connectors to form a cross steel frame. The four cross steel frames form a closed steel frame. Adjacent cross steel frames are fixedly connected by connecting plates.

[0023] Several limiting inserts 502 are provided on the inner walls of both sides of the U-shaped steel 5, and tie bars 503 are provided in the corresponding limiting inserts 502. Preferably, a new type of wedge-type tie bar 503 is used, which reduces the amount of rebar binding.

[0024] An L-shaped stiffening rib 7 is provided at the outer corner of the cross steel frame. Several through mounting holes are provided on one side wall of the L-shaped stiffening rib 7 and the U-shaped steel 5. Several threaded cylinders 6 are provided on the inner side of the other side wall of the U-shaped steel 5 at the positions of several mounting holes. A tie bolt 601 is provided in the corresponding threaded cylinder 6 and mounting hole.

[0025] Several internal supports 10 are provided between the cross-shaped precast shear key 9 and the combined lower rib beam 4; Several connecting threaded cylinders are pre-embedded on the side of the cross-shaped precast shear key 9. The side wall of the U-shaped steel 5 is provided with mounting threaded holes corresponding to the positions of the connecting threaded cylinders. Both ends of the internal support 10 are installed on the connecting threaded cylinders and the side of the U-shaped steel 5 by bolts.

[0026] The four sides of the cross-shaped precast shear key 9 are equipped with several precast shear key temporary supports 11 by bolts; A precast upper rib beam 12 is provided between the precast shear key temporary support 11 of the adjacent cross precast shear key 9.

[0027] Precast upper rib beam 12 is provided with precast upper rib beam temporary supports 13 on both sides, and precast composite slabs 14 are provided between adjacent precast upper rib beam temporary supports 13.

[0028] The supporting keel includes several main keels 2 and several secondary keels 3 installed on the scaffolding support system 1; Preferably, a main and secondary keel 3 support system is adopted, with the main and secondary keels 3 erected orthogonally on the upper side of the scaffolding support system, and a working platform erected on the upper side of the main keel 2.

[0029] The construction method includes the following steps: S1. First, install the scaffolding support system 1. Place the main keel 2 at the support point of the scaffolding support system 1. Place the secondary keel 3 orthogonally above the main keel 2. Place the steel plate above the secondary keel 3 as a working platform during installation. S2. Place several cross steel frames connected by cross connectors on the secondary keel 3. Connect adjacent U-shaped steels 5 with connecting plates. Lay steel bars inside adjacent cross steel frames. Then hoist the cross precast shear key 9 onto the cross steel frame, ensuring that the steel bar anchoring end of the cross precast shear key 9 enters the cross steel frame. Then tie and fix the steel bars laid inside the cross steel frame. At the same time, install the tie bolts 601 in the corresponding installation threaded cylinder 6 and installation hole. Install the internal support 10 on the cross precast shear key 9 and the combined lower rib beam 4. Then pour the concrete of the combined lower rib beam 4. S3. After the concrete of the combined lower rib beam 4 is cured and formed, the precast upper rib beam 12 is placed on the temporary support 11 of the precast shear key adjacent to the cross precast shear key 9. The precast composite slab 14 is placed on the temporary support of the upper rib beam on the adjacent precast upper rib beam 12. Then, a formwork is erected at the intersection of the anchorage end of the precast upper rib beam 12 and the anchorage end of the top reinforcing bar of the cross precast shear key 9, and the top concrete is poured. During the pouring, the edge of the combined lower rib beam 4 is closed. S4. After the top concrete is formed, remove the internal support 10, the precast shear key temporary support 11 and the upper rib temporary support.

[0030] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A prefabricated hollow sandwich panel structure, characterized in that, Includes a scaffolding support system and a support keel installed on the scaffolding support system, wherein the support keel is provided with a combined hollow sandwich panel structure; The combined hollow sandwich panel structure includes a combined lower rib beam disposed on the supporting keel, a cross-shaped prefabricated shear key disposed on the combined lower rib beam, a prefabricated upper rib beam disposed on the adjacent cross-shaped prefabricated shear key, and a prefabricated composite slab disposed between the adjacent prefabricated upper rib beams. The combined lower rib beam is composed of several U-shaped steels spliced ​​together. Four adjacent U-shaped steels are fixedly connected by cross connectors to form a cross steel frame. The four cross steel frames form a closed steel frame. Adjacent cross steel frames are fixedly connected by connecting plates. The inner walls on both sides of the U-shaped steel end are provided with a number of limiting cylinders, and the corresponding limiting cylinders are provided with tie bars; An L-shaped stiffening rib is provided at the outer corner of the cross steel frame. Several through mounting holes are provided on one side wall of the L-shaped stiffening rib and the U-shaped steel. Several threaded cylinders are provided on the inner side of the other side wall of the U-shaped steel corresponding to the mounting holes. Pull-through reinforcing bolts are provided in the corresponding threaded cylinders and mounting holes. Several internal supports are provided between the precast cross shear key and the combined lower rib beam. The precast cross shear key has several threaded connecting cylinders embedded in its side. The U-shaped steel sidewall has mounting threaded holes corresponding to the positions of the threaded connecting cylinders. Both ends of the internal support are bolted to the threaded connecting cylinders and the sidewall of the U-shaped steel. The precast cross shear key has several temporary supports for the precast shear key on its four sides by bolts; a precast upper rib beam is provided between the temporary supports of the precast shear key adjacent to the precast cross shear key. The precast upper rib beam is provided with temporary supports on both sides, and a precast composite slab is provided between adjacent temporary supports of the precast upper rib beam.

2. The prefabricated hollow sandwich panel structure according to claim 1, characterized in that, The supporting keel includes several main keels and several secondary keels installed on the scaffolding support system.

3. A construction method for the prefabricated hollow sandwich panel structure as described in claim 1 or 2, characterized in that, Includes the following steps: S1. First, install the scaffolding support system. Place the main keel at the support point of the scaffolding support system, place the secondary keel orthogonally above the main keel, and place the steel plate above the secondary keel as a working platform during installation. S2. Place several cross steel frames connected by cross connectors on the secondary keel. The adjacent U-shaped steels are fixedly connected by connecting plates. Reinforcing bars are laid inside the adjacent cross steel frames. Then, the cross prefabricated shear key is hoisted onto the cross steel frame, ensuring that the reinforcing bar anchoring end of the cross prefabricated shear key enters the interior of the cross steel frame. Then, the reinforcing bars laid inside the cross steel frame are tied and fixed. At the same time, the tie bolts are installed in the corresponding installation threaded cylinder and the installation hole. The internal support is installed on the cross prefabricated shear key and the combined lower rib beam. Then, the combined lower rib beam concrete is poured. S3. After the concrete of the combined lower rib beam is cured and formed, the precast upper rib beam is placed on the temporary support of the precast shear key of the adjacent cross precast shear key. The precast composite slab is placed on the temporary support of the precast upper rib beam on the adjacent precast upper rib beam. Then, a formwork is erected at the intersection of the anchorage end of the precast upper rib beam and the anchorage end of the top reinforcement of the cross precast shear key, and the top concrete is poured. S4. After the top concrete is formed, dismantle the internal supports, precast shear key temporary supports, and precast upper rib temporary supports.

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