An assembled thermal insulation sandwich floor structure

Abstract

The utility model provides an assembly type heat preservation sandwich floor structure relates to prefabricated heat preservation floor technical field, including first plastering layer, second plastering layer, heat preservation layer, steel bar truss and cast-in-place floor layer, the steel bar truss includes two parallelly arranged lower chord, upper chord and four oblique web members, a plurality of arc ribs are welded between two lower chord, a plurality of arc ribs upper side is welded with the connecting beam board, a plurality of support nuts on the welded connecting beam board, the threaded connection of support nut and anchor bolt on, the anchor bolt is in the downside of heat preservation layer, the oblique web member is passed through heat preservation layer, and two ends are welded on lower chord and upper chord respectively, the second plastering layer completely covers lower chord. In the utility model, the height of heat preservation layer can be supported by anchor bolt, so that the lower end inserted in heat preservation layer can contact the welding point of lower chord, and the upper end is close to upper chord, so as to weld steel bar truss, reduce prefabrication difficulty and improve structural strength.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated insulated floor slab technology, specifically to a prefabricated insulated sandwich floor slab structure. Background Technology

[0002] Prefabricated insulated sandwich slabs form a "sandwich" by placing insulation boards between a prefabricated base slab and a cast-in-place top slab of a composite floor slab. The layers are connected by truss reinforcement. The prefabricated base slab and the sandwich insulation layer are both manufactured in the factory, transported to the construction site, installed in place, and the cast-in-place top slab is poured. Then, the building surface layer can be applied. No secondary insulation construction is required, which ensures the quality of the floor slab construction and the insulation effect. The construction speed is fast and the construction cost is saved.

[0003] During the assembly of the precast base plate and the sandwich insulation layer, the specified slots need to be pre-cut according to the design specifications. Then, the four diagonal web members are manually inserted into the slots of the sandwich insulation layer. The welding of all the weld points of the upper and lower chords and all the diagonal web members is completed instantly by applying pressure and current simultaneously. In order to ensure that it is completely embedded in the composite plate, the sandwich insulation layer needs to be kept at a certain height above the lower chord. However, in the actual welding process, if the suspension height of the sandwich insulation layer is not appropriate, it will cause the weld point position of the diagonal web members to shift, increase the welding difficulty, and affect the welding strength of the steel truss. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a prefabricated insulated sandwich floor slab structure, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A prefabricated insulated sandwich floor slab structure includes a first plaster layer, on which several steel trusses are arranged in parallel. Each steel truss includes two parallel lower chord bars, an upper chord bar positioned above the lower chord bars, and four diagonal web members welded between the lower and upper chord bars. Several anchor bolts are welded to the lower chord bars. An insulation layer is placed on the upper side of the anchor bolts. Several inclined through holes are provided on the insulation layer. The diagonal web members slide through the inclined through holes and extend to the upper and lower sides of the insulation layer. A second plaster layer is precast between the insulation layer and the first plaster layer, completely covering the lower chord bars and flush with the anchor bolts. A cast-in-place floor slab is cast on the upper side of the insulation layer, completely covering the upper chord bars.

[0006] Preferably, a plurality of upwardly protruding arched ribs are welded between the two lower chords, and a connecting beam plate is welded to the upper side of the plurality of arched ribs. A plurality of supporting nuts are provided on the welded connecting beam plate, and an adjustment gap is provided between the supporting nuts and the first plaster layer. The anchor bolt is threadedly connected to the supporting nuts and extends upward.

[0007] Preferably, the lower end of the anchor bolt is welded with several inclined embedded bars.

[0008] Preferably, a bottom steel mesh is embedded in the first plaster layer, and a fixed-spacing groove is provided on the first plaster layer. The bottom steel mesh exposes the bottom wall protruding from the fixed-spacing groove, and the lower chord bar is placed in the fixed-spacing groove and rests against the bottom steel mesh.

[0009] Preferably, a top steel mesh is placed on the top chord bar, and the top steel mesh is embedded in the cast-in-place floor slab.

[0010] Preferably, the upper side of the first plaster layer is provided with several roughened pits, and the second plaster layer is cast onto the first plaster layer with the concave and convex shapes fitting together.

[0011] This utility model provides a prefabricated insulated sandwich floor slab structure. It has the following beneficial effects: 1. In this utility model, the preset height of the insulation layer can be adjusted by anchor bolts, and the lower span of the diagonal web members after being inserted into the preset diagonal holes on the insulation layer can be controlled, so that the upper and lower ends of the diagonal web members can contact the lower chord and upper chord placed in the spacer slot, which facilitates the welding of the steel truss.

[0012] 2. In this utility model, controlling the height of the insulation layer allows the lower chord reinforcement to be fully embedded in the second plaster layer, improving the firmness between the steel truss and the second plaster layer, and facilitating the construction and hoisting of the prefabricated insulated sandwich floor slab. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of a prefabricated insulated sandwich floor slab according to the present invention; Figure 2 This is a schematic diagram of the steel truss structure in this utility model.

[0014] In the diagram: 1. First plaster layer; 2. Second plaster layer; 3. Insulation layer; 4. Cast-in-place floor slab; 5. Steel truss; 51. Bottom chord; 52. Top chord; 53. Diagonal web member; 6. Bottom steel mesh; 7. Top steel mesh; 8. Arched rib; 9. Connecting beam and slab; 10. Support nut; 11. Anchor bolt. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0016] This utility model embodiment provides a prefabricated insulated sandwich floor slab structure, such as... Figure 1-2 As shown, from bottom to top, the structure includes a first plaster layer 1, a second plaster layer 2, an insulation layer 3, and a cast-in-place floor slab layer 4. Several parallel steel trusses 5 are pre-embedded between the second plaster layer 2 and the cast-in-place floor slab layer 4. Each steel truss 5 includes two parallel lower chord bars 51, an upper chord bar 52 positioned above the lower chord bar 51, and four diagonal web members 53 welded between the lower chord bar 51 and the upper chord bar 52. The lower chord bar 51 is pre-embedded in the second plaster layer 2, and the upper chord bar 52 is pre-embedded in the cast-in-place floor slab layer 4. Several roughened recesses are provided on the upper side of the first plaster layer 1. The second plaster layer 2 is cast onto the first plaster layer 1 with a convex-concave fit. Several inclined through holes are provided on the insulation layer 3, and the four diagonal web members 53 are inclinedly inserted into these through holes, with their upper and lower ends welded to the upper chord bar 52 and the lower chord bar 51, respectively.

[0017] A bottom steel mesh 6 is pre-embedded in the first plaster layer 1. A fixed-spacing groove is provided on the first plaster layer 1. The bottom steel mesh 6 exposes the bottom wall protruding from the fixed-spacing groove. The lower chord bar 51 is placed in the fixed-spacing groove, abutting and welded to the bottom steel mesh 6. A top steel mesh 7 is abutted and tied to the upper chord bar 52. The top steel mesh 7 is pre-embedded in the cast-in-place floor slab 4. The first plaster layer 1, the second plaster layer 2, the insulation layer 3 and the cast-in-place floor slab 4 are formed as a whole by the bottom steel mesh 6, the steel truss 5 and the top steel mesh 7, thereby improving the structural strength of the prefabricated insulated sandwich floor slab.

[0018] Between the two lower chord reinforcements 51, several upwardly protruding arched ribs 8 are welded along the axial direction. The two ends of each arched rib 8 are welded to the lower chord reinforcement 51, and the middle of each arched rib 8 protrudes upwards. A connecting beam plate 9 is welded to the upper side of each arched rib 8. Several supporting nuts 10 are attached to the welded connecting beam plate 9. An adjustment gap is provided between the supporting nuts 10 and the first plaster layer 1. An anchor bolt 11 is threaded to the supporting nuts 10 and extends upwards. Several inclined embedded ribs are welded to the lower end of the anchor bolt 11. Rotating the anchor bolt allows the anchor bolt 11 to slide up and down within the adjustment gap on the supporting nuts 10, thus supporting the insulation layer 3 and ensuring the insulation layer... 3. Maintain a certain height above the first plaster layer 1 so that the upper and lower ends of the inclined web members 53 inserted into the through holes can contact the upper chord reinforcement 52 and the lower chord reinforcement 51 to complete the welding of the steel truss 5. After welding, the second plaster layer 2 can be poured in the gap between the insulation layer 3 and the first plaster layer 1. Through the support height of the anchor bolts 11, the second plaster layer 2 can completely cover the lower chord reinforcement 51, thereby improving the structural strength of the steel truss 5, the first plaster layer 1, and the second plaster layer 2. This facilitates the hoisting of parts prefabricated in the factory. At the same time, the bow ribs 8, the connecting beams 9, and the anchor bolts 11 together form the structural skeleton embedded in the second plaster layer 2, thereby improving the structural strength of the second plaster layer 2.

[0019] Working principle: In the prefabricated insulated sandwich slab structure of this utility model, during the casting process, two lower chord reinforcement bars 51, arched ribs 8, connecting beams 9, and support nuts 10 are pre-welded into a whole in the factory. Then, the first plaster layer 1 is poured, and the bottom steel mesh 6 is pre-embedded at the same time. After the first plaster layer 1 is completely solidified, several parallel spaced grooves are milled on the upper side of the first plaster layer 1. The two welded lower chord reinforcement bars 51 are placed in the spaced grooves. The height of the anchor bolts 11 is adjusted by turning the knobs to keep several anchor bolts 11 at a uniform height to form a support frame. The insulation layer 3 is placed on the anchor bolts 11, so that the insulation layer 3 with oblique through holes is held at a certain height above the first plaster layer 1. Four oblique web members 53 are inserted into the oblique through holes as a group. By controlling the height of the insulation layer 3, the lower ends of the diagonal web members 53 are all in contact with the welding points on the side walls of the lower chord reinforcement 51 for welding and fixing. At the same time, the upper ends of the four diagonal web members 53 are close together and easy to weld with the upper chord reinforcement 52. This allows them to be welded together to form a steel truss 5. Then, the second plaster layer 2 is poured, making the first plaster layer 1, the second plaster layer 2, and the insulation layer 3 a whole. After the second plaster layer 2 is completely solidified, the prefabrication process of the prefabricated insulated sandwich floor slab structure can be completed in the factory. The upper chord reinforcement 52 of the steel truss 5 is higher than the insulation layer 3 to facilitate construction hoisting. After hoisting, the top steel mesh 7 is laid and tied to the upper chord reinforcement 52. The cast-in-place floor slab layer 4 is then poured on site to form a complete prefabricated insulated sandwich floor slab structure.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated insulated sandwich floor slab structure, comprising a first plaster layer, characterized in that: A number of steel trusses are arranged in parallel on the first plaster layer. The steel trusses include two parallel lower chord bars, an upper chord bar above the lower chord bars, and four diagonal web bars welded between the lower and upper chord bars. A number of anchor bolts are welded on the lower chord bars. An insulation layer is placed on the upper side of the anchor bolts. A number of inclined through holes are opened on the insulation layer. The diagonal web bars slide through the inclined through holes and extend to the upper and lower sides of the insulation layer. A second plaster layer is precast between the insulation layer and the first plaster layer. The second plaster layer completely covers the lower chord bars and is flush with the anchor bolts. A cast-in-place floor slab is cast on the upper side of the insulation layer. The cast-in-place floor slab completely covers the upper chord bars.

2. The prefabricated insulated sandwich floor slab structure according to claim 1, characterized in that: Between the two lower chords, a plurality of upwardly protruding arched ribs are welded along the axial direction. A connecting beam plate is welded to the upper side of the plurality of arched ribs. A plurality of supporting nuts are on the welded connecting beam plate. An adjustment gap is provided between the supporting nuts and the first plaster layer. An anchor bolt is threadedly connected to the supporting nuts and extends upward.

3. The prefabricated insulated sandwich floor slab structure according to claim 2, characterized in that: The lower end of the anchor bolt is welded with several inclined embedded bars.

4. The prefabricated insulated sandwich floor slab structure according to claim 3, characterized in that: A bottom steel mesh is embedded in the first plaster layer, and a fixed-spacing groove is provided on the first plaster layer. The bottom steel mesh is exposed and protrudes from the bottom wall of the fixed-spacing groove. The lower chord bar is placed in the fixed-spacing groove and rests against the bottom steel mesh.

5. The prefabricated insulated sandwich floor slab structure according to claim 4, characterized in that: A top steel mesh is placed on the top chord bar, and the top steel mesh is embedded in the cast-in-place floor slab.

6. The prefabricated insulated sandwich floor slab structure according to claim 5, characterized in that: The upper side of the first plaster layer is provided with several roughened pits, and the second plaster layer is cast on the first plaster layer with the concave and convex shapes.

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