A construction method for a large-span prestressed concrete double T-plate installation structure

Abstract

The present invention discloses a construction method for a large-span prestressed concrete double-T plate installation structure, wherein the installation structure includes a frame beam, a parapet provided on one side of the top of the frame beam, a double-T plate connected to the inner side of the parapet and connected to the top of the frame beam, a plate top embedded plate and a plate bottom embedded component assembly provided on the top and bottom surfaces of the double-T plate ends, respectively, a beam top embedded plate provided at the top of the frame beam corresponding to the plate bottom embedded component assembly at the bottom, and embedded steel bars provided inside the parapet and corresponding to the connecting plate top embedded plate. The present invention connects the plate through the tube to the inside of the rib plate rather than the surface, thereby strengthening the connection strength of the bottom plate connecting plate; the provision of embedded steel bars facilitates the fixing of the top of the double-T plate; the provision of the inter-plate connecting plate in combination with the provision of the adjacent end plate top embedded plates facilitates the effective connection of the double-T plate at the splicing point, and the inter-plate filling layer seals and strengthens the connection between adjacent areas.

Description

Technical Field

[0001] The invention belongs to the technical field of double T-plate installation, and in particular relates to a construction method of a large-span prestressed concrete double T-plate installation structure. Background Art

[0002] Unlike ordinary linear floor slabs, double-T slabs are increasingly used as floor slabs in construction due to their superior performance. Existing installation methods for double-T slabs simply connect the slabs to pre-embedded beam components. This connection only meets the requirements of small-span installations. As the span of the double-T slab increases, the connection becomes insufficient. Ensuring effective connection of double-T slabs in large spans and the assembly and connection of these large-span double-T slabs require specific design. Summary of the Invention

[0003] The present invention provides a construction method for a large-span prestressed concrete double-T plate installation structure, which is used to solve technical problems such as the reinforced connection between the top of the double T plate and the parapet, the reinforced connection between the bottom and the beam body, and the longitudinal splicing connection of the double T plate.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The large-span prestressed concrete double-T slab installation structure includes a frame beam, a parapet wall provided on one side of the top of the frame beam, a double-T slab connected to the inner side of the parapet wall and connected to the top of the frame beam, slab top embedded plates and slab bottom embedded parts assemblies provided on the top and bottom surfaces of the double-T slab ends, a beam top embedded plate provided at the top of the frame beam corresponding to the bottom embedded parts assembly at the bottom, and embedded steel bars provided inside the parapet wall and corresponding to the connection slab top embedded plates.

[0006] Among them, the inner vertical part of the parapet and the top surface of the frame beam are set with an L-shaped gap, and double T-plates are installed at the corresponding L-shaped gap;

[0007] The specific steps for the construction method of the large-span prestressed concrete double T-plate installation structure are as follows:

[0008] Step 1: Prefabricate a double T-plate of prestressed concrete and mark the positions of the bottom embedded components and top embedded plates to be installed on the double T-plate;

[0009] Step 2: pre-embed a plate base plate with a plate through-tube at the marked position at the bottom of the double T-plate, and then weld a plate connecting plate on the plate base plate, wherein the plate connecting plate is smaller than the plate base plate; pre-install a plate top embedded plate on the top of the double T-plate, and fix the plate top embedded plate to the steel bars in the plate;

[0010] Step 3: Splice the long-span double T-plates together. Adjacent double T-plate ends are provided with top embedded plates, and the adjacent top embedded plates are connected by inter-plate connecting plates. The double T-plates at the ends are fixed to the frame beams and parapets respectively through the bottom embedded parts and the top embedded plates.

[0011] Step 4: When installing the double T-plate at the end, determine the position of the embedded steel bars according to the height of the double T-plate; determine the position of the embedded plate on the top of the beam according to the position of the ribs in the double T-plate;

[0012] Step 5: The embedded steel bars are in the shape of a polygonal bar. The opening is set inside the parapet. The closed arc-shaped bent end is welded to the top embedded plate of the double T-plate. The beam top embedded plate is welded to the bottom embedded component of the double T-plate.

[0013] Step 6. There is a gap between the end of the double T-plate and the inner side of the parapet; the gap is filled with an inter-plate filling layer between the parapet and the top plate flange of the double T-plate, thereby completing the installation of the large-span prestressed concrete double T-plate.

[0014] Furthermore, the double T-plate includes a top plate and two rib plates arranged below the top plate, and the two rib plates form a T shape with the top plate respectively; a plate bottom embedded part assembly is provided under each rib plate, wherein the plate through tube penetrates into the rib plate and its height is not less than half of the rib plate height; a plate top embedded plate is provided at the center line position of the top plate or at the position on the top plate corresponding to the center line of the two rib plates.

[0015] Furthermore, the inner side of the parapet is not less than 250mm away from the inner side of the frame beam, and the plate end filling layer between the parapet and the top plate is filled with fine stone concrete and the filling height is from the top surface height of the top plate to the top surface height of the frame beam.

[0016] Furthermore, the plate-base plate and the plate-through-tube are fixedly connected by welding the plate-hole-tube weld, and the plate-hole-tube weld is arranged circumferentially along the plate-through-tube, and the weld thickness is not less than 2 mm; the plate-base plate and the plate-connecting plate are fixedly connected by the inter-plate weld, and the weld is arranged at the connecting corner between the plate-connecting plate and the plate-base plate.

[0017] Furthermore, the beam top embedded plate is a steel plate, which is pre-set on the top of the frame beam and the top surface elevation of the beam top embedded plate is flush with the top surface elevation of the frame beam;

[0018] The beam top embedded plate is fully distributed over the width of the L-shaped notch, and the beam top embedded plate is welded to the plate connecting plates on both sides and the outside of the length direction.

[0019] Furthermore, the embedded steel bars are welded to the embedded plate on the top of the slab and both sides of the embedded steel bars are fully welded.

[0020] Furthermore, the connecting plate between the plates is a thick steel plate, is in an inverted V shape, and is provided with horizontal flanges on both sides of the opening, and the horizontal flanges are respectively connected to the embedded plates on the top of the plates.

[0021] Furthermore, inter-plate gaps are provided between adjacent double T-plates, and inter-plate filling layers are provided in the inter-plate gaps; the inter-plate filling layers are provided in an inverted trapezoidal shape and are filled with fine stone concrete grouting.

[0022] Furthermore, after the installation is completed, the exposed surface of the embedded steel bars and the exposed surface of the corresponding top embedded plate are derusted on both sides, and then coated with asphalt not less than 5mm thick. The roof is equipped with a 50mm thick C20 concrete pouring layer, equipped with 8@200 bidirectional steel bars, and the steel bars are anchored in the parapet.

[0023] The beneficial effects of the present invention are embodied in:

[0024] 1) The present invention further utilizes the structural characteristics of the double T-plate by setting up the bottom plate embedded component, connecting the plate through the tube to the inside of the rib plate instead of the surface, thereby strengthening the connection strength of the bottom plate and the plate;

[0025] 2) The present invention facilitates the fixation of the top of the double T-plate by providing pre-buried steel bars, thereby simultaneously fixing the top and bottom of the double T-plate, thereby strengthening the fixation of the double-body plate; in addition, a plate end filler is provided to further seal and reinforce the end connection;

[0026] 3) The present invention facilitates effective connection of double T-plates at the joints by providing connecting plates between plates in combination with embedded plates on the tops of adjacent end plates, and seals and strengthens the connection between adjacent plates by filling the inter-plate layers.

[0027] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention; the main purpose and other advantages of the present invention can be realized and obtained through the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the end installation structure of a large-span prestressed concrete double T-plate;

[0029] Figure 2 This is a schematic diagram of the local structure of the end installation of a large-span prestressed concrete double T-slab;

[0030] Figure 3 It is a schematic diagram of the double T-plate structure;

[0031] Figure 4 It is a schematic diagram of the connection between the embedded plate on the top of the slab and the embedded parts on the bottom of the slab;

[0032] Figure 5 This is a schematic diagram of the connection between the beam top embedded plate and the embedded steel bars;

[0033] Figure 6 It is the front view of the embedded components at the bottom of the plate;

[0034] Figure 7 It is the side view of the embedded parts at the bottom of the plate;

[0035] Figure 8 This is a schematic diagram of the plate-through-tube connection structure;

[0036] Figure 9 This is a side view diagram of the installation of the inter-board connecting plate;

[0037] Figure 10 This is a top view of the installation of the connecting plate between the boards;

[0038] Figure 11 This is a schematic diagram of the board end filling layer setting.

[0039] Figure markings: 1-double T plate, 101-top plate, 102-rib plate, 2-frame beam, 3-parapet, 4-plate bottom embedded component, 41-plate base plate, 42-plate through-tube, 43-weld between plates, 44-plate connecting plate, 45-plate hole tube weld, 5-plate top embedded plate, 6-beam top embedded plate, 7-embedded steel bar, 8-plate end gap, 9-plate connecting plate, 10-plate gap, 11-filling layer between plates, 12-plate end filling layer. DETAILED DESCRIPTION

[0040] Taking an industrial park project as an example, the total height of a single building is 19.65m; its structural form is a concrete frame structure, the seismic fortification intensity is 7 degrees, the seismic level is level 2, and the design service life is 50 years. The double T-plate construction area is the top plate in the middle area of ​​the top floor, with a total plane area of ​​621㎡. To ensure the effective installation of the double T-plate, such as Figures 1 to 11 As shown, through the construction method of the large-span prestressed concrete double T-plate installation structure, the large-span prestressed concrete double T-plate installation structure includes a frame beam 2, a parapet 3 arranged on one side of the top of the frame beam 2, a double T-plate 1 connected to the inner side of the parapet 3 and connected to the top of the frame beam 2, a plate top embedded plate 5 and a plate bottom embedded component assembly 4 respectively arranged on the top and bottom surfaces of the end of the double T-plate 1, a beam top embedded plate 6 located at the top of the frame beam 2 and arranged corresponding to the plate bottom embedded component assembly 4 at the bottom, and an embedded steel bar 7 arranged inside the parapet 3 and corresponding to the connection plate top embedded plate 5;

[0041] In this embodiment, the double-T slab 1 comprises a top plate 101 and two ribs 102 disposed below it, forming a T-shape with the top plate 101. The double-T slab 1 is 19.58 meters long, with a double rib height of 540-750 mm. Eight suspension points are located within the slab. Eight pre-tensioned steel wire ropes are used, two of which are 15.2 mm in diameter and six of which are 12.7 mm in diameter.

[0042] In this embodiment, a plate bottom embedded part assembly 4 is provided under each rib plate 102, wherein the plate through tube 42 penetrates into the rib plate 102 and its height is not less than half the height of the rib plate 102; a plate top embedded plate 5 is provided at the center line position of the top plate 101 or at the position on the top plate 101 corresponding to the center line of two rib plates 102.

[0043] Among them, the inner vertical part of the parapet 3 and the top surface of the frame beam 2 are set in an L-shaped gap, and the double T-plate 1 is installed correspondingly at the L-shaped gap; in this embodiment, the inner side of the parapet 3 is not less than 250 mm away from the inner side of the frame beam 2, and the plate end filling layer 12 between the parapet 3 and the top plate 101 is filled with C20 fine stone concrete and the filling height is from the top surface height of the top plate 101 to the top surface height of the frame beam 2.

[0044] Combine Figures 1 to 11 , further explain the construction method for the large-span prestressed concrete double T-plate installation structure, the specific steps are as follows:

[0045] Step 1: prefabricate a double T-plate 1 of prestressed concrete, and mark the positions of the bottom embedded component 4 and the top embedded plate 5 to be installed on the double T-plate 1.

[0046] Step 2: Pre-embed a base plate 41 with a plate through-tube 42 at the marked position on the bottom of the double-T plate 1. Then, weld a connecting plate 44 onto the base plate 41. The connecting plate 44 is smaller than the base plate 41. Pre-install a top embedded plate 5 on the top of the double-T plate 1 and securely connect it to the steel bars within the plate. Both the base plate 41 and the connecting plate 44 are rectangular steel plates.

[0047] The plate-base plate 41 and the plate through-tube 42 are fixedly connected by welding through a plate-hole-tube weld 45, and the plate-hole-tube weld 45 is circumferentially arranged along the plate through-tube 42, and the weld thickness is not less than 2 mm; the plate-base plate 41 and the plate-connecting plate 44 are fixedly connected by an inter-plate weld 43, and the weld is arranged at the connecting concave corner between the plate-connecting plate 44 and the plate-base plate 41.

[0048] Step 3: The double T-boards 1 with large spans are spliced ​​and connected in the length direction. The ends of adjacent double T-boards 1 are provided with plate top embedded plates 5 and the adjacent plate top embedded plates 5 are connected by inter-plate connecting plates 9; the double T-boards 1 arranged at the ends are fixedly installed on the frame beam 2 and the parapet 3 respectively through the plate bottom embedded parts assembly 4 and the plate top embedded plates 5.

[0049] The inter-panel connecting plates 9 are 8mm thick steel plates with a width of 90mm. They are inverted V-shaped with horizontal flanges on either side of the opening, which are connected to the embedded top plates 5. An inter-panel gap 10 is defined between adjacent double-T panels 1. Inter-panel filling layers 11 are provided within these gaps. These gaps are shaped like an inverted trapezoid and filled with C20 fine aggregate concrete.

[0050] Step 4: When installing the double T-plate 1 at the end, determine the position of the embedded steel bars 7 according to the height of the double T-plate 1; determine the position of the beam top embedded plate 6 according to the position of the ribs 102 in the double T-plate 1.

[0051] The beam top embedded plate 6 is a steel plate. The beam top embedded plate 6 is pre-set on the top of the frame beam 2 and the top surface elevation of the beam top embedded plate 6 is flush with the top surface elevation of the frame beam 2; the beam top embedded plate 6 is fully distributed over the width of the L-shaped notch, and the beam top embedded plate 6 is welded to the plate connecting plate 44 on both sides and the outside of the length.

[0052] Step 5. The embedded steel bars 7 are polygonal bars with the opening set inside the parapet 3. The closed arc bent ends are welded to the top embedded plate 5 on the top of the double T plate 1; the beam top embedded plate 6 is welded to the bottom embedded component 4 on the bottom of the double T plate 1.

[0053] The embedded steel bars 7 are welded to the embedded plate 5 on the top of the plate, and both sides of the embedded steel bars 7 are fully welded.

[0054] Step 6. A plate end gap 8 is set between the end of the double T-board 1 and the inner side of the parapet 3; the plate end gap 8 is filled with an inter-plate filling layer 11 between the parapet 3 and the flange of the top plate 101 of the double T-board 1, thereby completing the installation of the large-span prestressed concrete double T-board 1.

[0055] After the installation is completed, the exposed surface of the embedded steel bars 7 and the exposed surface of the corresponding top embedded plate are derusted on both sides, and then coated with asphalt not less than 5mm thick. The roof is provided with a 50mm thick C20 concrete pouring layer, with 8@200 bidirectional steel bars inside, and the steel bars are anchored into the parapet 3.

[0056] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that a person skilled in the art can conceive within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a large-span prestressed concrete double T-plate installation structure, characterized in that: The large-span prestressed concrete double T-plate installation structure comprises a frame beam (2), a parapet wall (3) arranged on one side of the top of the frame beam (2), a double T-plate (1) connected to the inner side of the parapet wall (3) and connected to the top of the frame beam (2), a plate top embedded plate (5) and a plate bottom embedded component assembly (4) respectively arranged on the top and bottom surfaces of the end of the double T-plate (1), a beam top embedded plate (6) located at the top of the frame beam (2) and arranged corresponding to the plate bottom embedded component assembly (4) at the bottom, and embedded steel bars (7) arranged inside the parapet wall (3) and corresponding to the connecting plate top embedded plate (5); The inner vertical portion of the parapet (3) and the top surface of the frame beam (2) are provided with an L-shaped notch, and a double T-plate (1) is installed corresponding to the L-shaped notch; The double T-plate (1) comprises a top plate (101) and two rib plates (102) arranged below the top plate (101), wherein the two rib plates (102) respectively form a T-shape with the top plate (101); a plate bottom embedded component assembly (4) is arranged below each rib plate (102), wherein a plate through-tube (42) penetrates into the rib plate (102) and its height is not less than half the height of the rib plate (102); a plate top embedded plate (5) is arranged at a centerline position of the top plate (101) or at a position on the top plate (101) corresponding to the centerline of the two rib plates (102); The specific steps for the construction method of the large-span prestressed concrete double T-plate installation structure are as follows: Step 1: prefabricate a double T-plate (1) of prestressed concrete, and mark the positions of the bottom embedded component (4) and the top embedded plate (5) to be installed on the double T-plate (1); Step 2: pre-embed a plate base plate (41) with a plate through-tube (42) at a marked position on the bottom of the double T-plate (1), and then weld a plate connecting plate (44) on the plate base plate (41), wherein the plate connecting plate (44) is smaller than the plate base plate (41); pre-install a plate top pre-embedded plate (5) on the top of the double T-plate (1), and the plate top pre-embedded plate (5) is fixedly connected to the steel bars in the plate; Step 3: The double T-plates (1) with a large span are spliced ​​and connected in the longitudinal direction. The ends of the adjacent double T-plates (1) are provided with plate top embedded plates (5), and the adjacent plate top embedded plates (5) are connected by plate connecting plates (9); the double T-plates (1) arranged at the ends are fixedly installed on the frame beam (2) and the parapet (3) by the plate bottom embedded component assembly (4) and the plate top embedded plate (5); Step 4: When installing the double T-plate (1) at the end, determine the position of the embedded steel bars (7) according to the height of the double T-plate (1); determine the position of the beam top embedded plate (6) according to the position of the rib plate (102) in the double T-plate (1); Step 5: The embedded steel bar (7) is a polygonal bar, the opening of which is set inside the parapet (3), and the closed arc-shaped bent end is welded to the top embedded plate (5) on the top of the double T plate (1); the beam top embedded plate (6) is welded to the bottom embedded component (4) on the bottom of the double T plate (1); Step 6: A plate end gap (8) is provided between the plate end of the double T plate (1) and the inner side of the parapet (3); the plate end gap (8) is filled with an inter-plate filling layer (11) between the parapet (3) and the flange of the top plate (101) of the double T plate (1), thereby completing the installation of the large-span prestressed concrete double T plate (1).

2. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 1, characterized in that: The inner side of the parapet wall (3) is not less than 250 mm from the inner side of the frame beam (2). The plate end filling layer (12) between the parapet wall (3) and the top plate (101) is filled with fine stone concrete and the filling height is from the top surface height of the top plate (101) to the top surface height of the frame beam (2).

3. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 1, characterized in that: The plate-base plate (41) and the plate-through-tube (42) are fixedly connected by welding via a plate-hole-tube weld (45), and the plate-hole-tube weld (45) is circumferentially arranged along the plate-through-tube (42), with a weld thickness of not less than 2 mm; the plate-base plate (41) and the plate-connecting plate (44) are fixedly connected via an inter-plate weld (43), and the weld is arranged at a connecting inner corner between the plate-connecting plate (44) and the plate-base plate (41).

4. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 1, characterized in that: The beam top embedded plate (6) is a steel plate, and the beam top embedded plate (6) is pre-arranged on the top of the frame beam (2), and the top surface elevation of the beam top embedded plate (6) is flush with the top surface elevation of the frame beam (2); The beam top embedded plate (6) is fully distributed over the width of the L-shaped notch, and the beam top embedded plate (6) is welded to the plate connecting plate (44) on both sides and the outside of the length direction.

5. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 1, characterized in that: The embedded steel bars (7) are welded to the embedded plate (5) on the top of the plate, and both sides of the embedded steel bars (7) are fully welded.

6. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 1, characterized in that: The inter-plate connecting plate (9) is a thick steel plate, is in an inverted V shape, and has horizontal flanges on both sides of the opening, and the horizontal flanges are respectively connected to the plate top embedded plate (5).

7. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 6, characterized in that: An inter-plate gap (10) is provided between adjacent double T-plates (1), and an inter-plate filling layer (11) is provided in the inter-plate gap (10); the inter-plate filling layer (11) is provided in an inverted trapezoidal shape and is filled with fine stone concrete grouting.

8. The construction method of a large-span prestressed concrete double T-plate installation structure according to claim 1, characterized in that: After the installation is completed, the exposed surface of the embedded steel bar (7) and the exposed surface of the corresponding top embedded plate are derusted on both sides, and then coated with asphalt with a thickness of not less than 5mm. The roof is provided with a 50mm thick C20 concrete pouring layer, with 8@200 bidirectional steel bars inside, and the steel bars are anchored in the parapet (3).

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