Form-removal-free top plate in narrow air duct

Abstract

The utility model relates to a formwork-removal-free top plate in a narrow air duct. The top plate is erected on a side wall and comprises a floor bearing plate and a concrete layer which are arranged from bottom to top. Embedded steel bars are horizontally inserted into the concrete layer; the edge of the floor support plate does not exceed the top boundary of the side wall; and one end of the embedded steel bar is embedded into the side wall. The floor plate is used for bearing the top plate formed by the non-solidified concrete, bottom formwork erecting is not needed, the task that workers enter the air duct for formwork dismantling is omitted, and the air duct formwork is suitable for construction of narrow air ducts; the concrete layer is bonded with the top of the side wall, and the embedded steel bars are connected with the side wall, so that the overall strength of the air duct can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of air duct construction, in particular to a top plate free of mold removal in a narrow air duct. Background Art

[0002] An air duct is a passage made of concrete for air circulation. A general air duct includes a top plate, side walls and a bottom plate; the top plate is provided with vents. In the prior art, the construction of an air duct is to support the formwork inside the air duct, then pour concrete, wait for the concrete to solidify, and then have workers enter the air duct through the vents to remove the formwork. However, for narrow air ducts, workers cannot enter the air duct through the vents to remove the formwork. The air duct requires an unobstructed interior without obstructing air circulation; therefore, existing construction technology cannot be used to construct narrow air ducts; simple side walls and bottom plates can be constructed in the form of conventional formwork and pouring, see Figure 2 ; However, the construction of the top plate is the difficulty of the narrow air duct construction. Utility Model Content

[0003] The utility model aims to solve the above problems and provide a top plate in a narrow air duct that does not require mold removal.

[0004] The technical solution of the utility model is: a formwork-free top plate in a narrow air duct, which is erected on the side wall and comprises a floor decking plate and a concrete layer arranged from bottom to top; the concrete layer is horizontally inserted with embedded steel bars; the edge of the floor decking plate does not exceed the boundary of the top surface of the side wall; the floor decking plate can prevent unsolidified concrete from leaking from the middle, and the top plate cannot be formed; the concrete layer wraps the edge of the floor slab and the edge of the side wall to form the top plate; the embedded steel bars are L-shaped, and one end is embedded in the inside of the side wall; the embedded steel bars connect the top plate and the side wall into one, forming a closed air duct.

[0005] Preferably, the floor deck is a steel truss floor deck; the steel truss is arranged on the top surface of the floor slab to increase the structural strength of the top plate; the ends of the embedded steel bars are tied and connected to the steel truss to increase the connection strength between the top plate and the side wall;.

[0006] Preferably, the formwork-free top plate in the narrow air duct also includes a formwork concrete layer arranged at the vent; cutting in the center of the floor decking is very difficult, and the formwork concrete layer is a concrete layer formed by formwork; because the formwork concrete layer is close to the vent, the formwork can be removed without the need for workers to enter; therefore, providing a formwork concrete layer at the vent can reduce the cutting amount of the floor decking plate, and can also connect with the concrete layer after it is formed.

[0007] Preferably, the formwork-free top plate in the narrow air duct also includes an expansion water stop strip; adjacent floor decking plates are connected by the expansion water stop strip to achieve splicing of the floor decking plates to adapt to the direction of the air duct.

[0008] Furthermore, the expansion water stop strip is arranged on the top surface of the floor decking plate, which can ensure the connection strength of adjacent floor decking plates.

[0009] Preferably, steel cages are arranged in the concrete layer to improve the structural strength of the concrete layer.

[0010] Furthermore, the embedded steel bars are connected to the steel cage to increase the connection strength between the top plate and the side walls.

[0011] The beneficial effects of the utility model are as follows: the mold-free top plate in the narrow air duct of the utility model has the following advantages:

[0012] (1) The utility model uses the floor slab to support the top slab formed by the unsolidified concrete, which eliminates the need for bottom formwork and the task of workers entering the air duct to remove the formwork. It is suitable for the construction of narrow air ducts. The bonding of the concrete layer to the top of the side wall and the connection with the side wall through the embedded steel bars can ensure the overall strength of the air duct.

[0013] (2) The embedded steel bars of the utility model are connected to the steel cage, thereby increasing the connection strength between the top plate and the side wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the installation of a mold-free top plate in a narrow air duct of the utility model;

[0015] Figure 2 It is a three-dimensional diagram after the side wall and the bottom plate are formed in the prior art;

[0016] Figure 3 yes Figure 1 A three-dimensional view after the reinforced concrete layer is removed;

[0017] Figure 4 yes Figure 1 A top view of

[0018] Figure 5 yes Figure 4 AA section view;

[0019] Figure 6 yes Figure 4 BB cross-sectional view;

[0020] Figure 7 It is the on-site construction drawing of the utility model;

[0021] In the figure: 0. Side wall, 1. Floor decking, 2. Concrete layer, 3. Embedded steel bars, 4. Formwork concrete layer, 5. Expansion waterstop. DETAILED DESCRIPTION

[0022] Example 1: See Figure 1-6A formwork-free top plate in a narrow air duct is erected on a side wall 0, comprising a floor deck 1 and a concrete layer 2 arranged from bottom to top; the concrete layer 2 is horizontally inserted with embedded steel bars 3; the edge of the floor deck 1 does not exceed the top surface boundary of the side wall 0; the floor deck 1 can prevent unsolidified concrete from leaking from the middle, and the top plate cannot be formed; the concrete layer 2 wraps the edge of the floor slab and the edge of the side wall 0 to form a top plate; the embedded steel bars 3 are L-shaped, and one end is embedded in the inside of the side wall 0; the embedded steel bars 3 connect the top plate and the side wall 0 into one, forming a closed air duct.

[0023] Compared with the prior art, the utility model uses the floor slab to support the top slab formed by unsolidified concrete, and there is no need for bottom formwork, and also eliminates the task of workers entering the air duct to remove the formwork, which is suitable for the construction of narrow air ducts; the bonding of the concrete layer 2 to the top of the side wall 0 and the connection with the side wall 0 through the embedded steel bars 3 can ensure the overall strength of the air duct.

[0024] In this embodiment, adjacent floor decking plates 1 are connected by overlapping.

[0025] The embedded steel bars 3 pass through the edge of the floor decking slab 1 to fully limit the position of the floor decking slab 1 .

[0026] The floor deck 1 is a steel truss floor deck 1; the steel truss is arranged on the top surface of the floor slab, which can increase the structural strength of the top plate; the end of the embedded steel bar 3 is tied and connected with the steel truss, which can increase the connection strength between the top plate and the side wall 0;.

[0027] The formwork-free top plate in the narrow air duct also includes a formwork concrete layer 4 arranged at the vent; cutting in the center of the floor decking 1 is very difficult, and the formwork concrete layer 4 is a concrete layer 2 formed by formwork; because the formwork concrete layer 4 is close to the vent, the formwork can be removed without the need for workers to enter; therefore, setting the formwork concrete layer 4 at the vent can reduce the cutting amount of the floor decking 1 and can also connect with the concrete layer 2 after it is formed.

[0028] Steel cages are arranged inside the concrete layer 2 to improve the structural strength of the concrete layer 2 .

[0029] The embedded steel bars 3 are connected to the steel cage to increase the connection strength between the top plate and the side wall 0.

[0030] The casting process of this embodiment is as follows: the side wall 0 and the bottom plate of the air duct are cast using a conventional formwork casting method; after the side wall 0 and the bottom plate of the air duct are solidified and formed, the side wall 0 and the bottom plate are demolded; at this time, the side wall 0 and the bottom plate are open, and workers will not be restricted by space to demold; the top of the side wall 0 is evenly distributed with embedded steel bars 3 that exceed the top of the side wall 0; the side wall 0 and the bottom plate that are connected as one after demolding are formed; an area is demarcated within a certain range around the vent as the formwork range of the formwork concrete layer 4; this range is the range that workers can reach by extending their arms from the vent into the interior of the air duct; the floor decking 1 is used to cover the remaining range of the air duct; the edge of the floor decking 1 is placed on the side wall 0; the edge of the floor decking 1 exceeds the inner edge of the side wall 0, but does not exceed the outer edge of the side wall 0; according to the direction of the air duct, the floor decking 1 can be appropriately Field cutting; if a steel truss is provided on the floor decking 1, the length direction of the steel truss is in the same direction as the direction of the air duct; a through hole corresponding to the embedded steel bar 3 is provided on the edge of the floor decking 1; the embedded steel bar 3 passes through the through hole; adjacent floor decking slabs 1 are connected by overlapping or using expansion water stop strips 5; a steel cage is provided on the floor decking slab 1 to increase the structural strength of the concrete layer 2; the embedded steel bar 3 is bent into the air duct and tied together with the steel truss or steel cage; formwork is supported on both sides of the air duct and in the vent area; one edge of the top formwork of the vent area formwork extends to the bottom of the floor decking slab 1, and three edges are attached to the side wall 0; the top of the formwork on both sides of the air duct exceeds the steel truss or steel cage; concrete is poured so that the concrete submerges the steel truss or steel cage, but does not exceed the top of the formwork at the vent;

[0031] After the concrete solidifies, the top plate of the duct is formed; for the formwork in other areas, workers only need to remove the formwork from the outside; for the formwork in the vent area, workers only need to extend their arms at the formed vents to remove the formwork in the vent area without entering the inside of the duct.

[0032] Embodiment 2: Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The difference is that the formwork-free top plate in the narrow air duct also includes an expansion water stop strip 5; adjacent floor decking plates 1 are connected by the expansion water stop strip 5 to achieve the splicing of the floor decking plates 1 to adapt to the direction of the air duct.

[0033] The expansion water stop strip 5 is arranged on the top surface of the floor decking slab 1 to ensure the connection strength of adjacent floor decking slabs 1 .

Claims

1. A mold-free top plate in a narrow air duct, mounted on a side wall, characterized in that: It includes a floor decking plate and a concrete layer arranged from bottom to top; the concrete layer is horizontally inserted with embedded steel bars; the edge of the floor decking plate does not exceed the boundary of the top surface of the side wall; the embedded steel bars are L-shaped, and one end is embedded in the inside of the side wall.

2. The mold-free top plate in a narrow air duct according to claim 1, characterized in that: The floor deck is a steel bar truss floor deck; the steel bar truss is arranged on the top surface of the floor slab; the end of the embedded steel bar is tied and connected to the steel bar truss.

3. The mold-free top plate in a narrow air duct according to claim 1, characterized in that: The invention also comprises a formwork concrete layer arranged at the vent.

4. The mold-free top plate in a narrow air duct according to claim 1, characterized in that: It also includes expansion water stop strips; adjacent floor decking plates are connected by expansion water stop strips.

5. The mold-free top plate in a narrow air duct according to claim 4, characterized in that: The expansion water stop strip is arranged on the top surface of the floor decking.

6. The mold-free top plate in a narrow air duct according to claim 1, characterized in that: Steel cages are arranged within the concrete layers.

7. The mold-free top plate in a narrow air duct according to claim 6, characterized in that: The embedded steel bars are connected to the steel cage.

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