Construction method of precast reinforced concrete wall with embedded steel plate welding connection form

Abstract

A construction method for a precast reinforced concrete wall with an embedded steel plate welded connection form, characterized by including the following steps: a. Fabricate the upper embedded welded connection steel plate of the precast reinforced concrete wall; b. Fabricate the lower embedded welded connection steel plate of the precast reinforced concrete wall; c. Fabricate the precast reinforced concrete wall with an embedded steel plate welded connection form; d. Install the upper and lower finished precast reinforced concrete walls with an embedded steel plate welded connection form. The construction method for the precast reinforced concrete wall with an embedded steel plate welded connection form of the present invention has a welded connection form, ensuring the connection reliability of the nodes between the upper shear wall and the lower shear wall. The precast wall combines the design methods of reinforced concrete and steel plate concrete, ensuring the connection quality between the upper and lower precast walls, accelerating the installation speed, enabling the rapid connection between the upper precast reinforced concrete wall and the lower precast reinforced concrete wall, making the connection of the structural connection nodes of the precast wall more visible, and having the advantages that the concealed acceptance work is simpler and more reliable.

Description

Technical Field

[0001] The present invention relates to a construction method for a reinforced concrete wall, and specifically, to a construction method for a precast reinforced concrete wall with an embedded steel plate welded connection form. Background Art

[0002] Currently, precast reinforced concrete walls mainly consist of shear walls for above-ground structures. The node connection forms of shear wall structures for basement exterior walls mainly include the following three types: the grouting connection form of steel bar sleeves, the lap joint connection form of steel bar slurry anchors, and the double-sided composite shear wall connection form. The first two are the shear wall connection forms in the Technical Standard for Assembled Concrete Structures GBT51231 - 2016, and the third is a newly developed precast shear wall connection form by various precast concrete processing plants in the past two years. The connection methods between these three types of shear walls are all carried out through steel bar forms. Among them, the first two are processed by grouting after sleeves and slurry anchors; the third is connected by inserting steel bars into the middle of the upper and lower laminated shear walls, and then connected by pouring fine stone concrete. The steel bar connection processing methods of these three precast shear wall structures all have certain difficulties in node connection and concealed acceptance, and quality control is prone to defects. For example, the grouting of the first two is not dense, and the fine stone concrete poured in the third is not dense, etc., resulting in defects in the connection between the upper and lower shear walls.

[0003] Therefore, the known connection methods for two shear walls have the above-mentioned various inconveniences and problems. Summary of the Invention

[0004] The purpose of the present invention is to provide a safe and reliable construction method for a precast reinforced concrete wall with an embedded steel plate welded connection form.

[0005] To achieve the above purpose, the technical solution of the present invention is:

[0006] A construction method for a precast reinforced concrete wall with an embedded steel plate welded connection form, characterized by including the following steps:

[0007] a. Fabricate the upper embedded welded connection steel plate of the precast reinforced concrete wall, including the following steps:

[0008] (1) Take two rectangular first steel plates with the same thickness and size of 2200mm×1050mm, and divide them into two parts along the short direction of the steel plate: the upper steel plate of the connection part is 2200mm×50mm, and the lower part buried in the precast wall is 2200mm×1000mm; on the upper steel plate of the connection part, a number of first square holes are opened at intervals of 50mm and 100mm along the long direction for passing through wall steel bars; in the lower part buried in the precast wall, a number of second square holes are opened at intervals of 200mm at a distance of 30mm from the edges of the long direction and the short direction for passing through floor steel bars and wall steel bars;

[0009] (2) Use several steel bars with a spacing of 400 mm × 400 mm. Arrange the two fabricated rectangular first steel plates vertically with their surfaces facing each other and weld them to form an upper steel plate frame. Weld several steel bars in parallel at equal distances between the steel plate frames, so that the center-to-center distance between the two steel plates is 300 mm;

[0010] b. Fabricate a lower embedded welded connecting steel plate for a precast reinforced concrete wall, including the following steps:

[0011] (1) Take two rectangular second steel plates with the same thickness and size of 2200 mm × 850 mm. Divide them into two parts along the short direction of the steel plate: the upper part of the lower embedded welded connecting steel plate buried in the precast wall is 2200 mm × 800 mm, and the lower part of the lower embedded welded connecting steel plate buried in the precast wall is 2200 mm × 50 mm; At the upper part of the embedded welded connecting steel plate, several second square holes are opened at intervals of 200 mm, 30 mm away from the edges in the long and short directions, for passing through the wall steel bars; At the lower part of the embedded welded connecting steel plate, several first square holes are opened at intervals of 50 mm and 100 mm in sequence along the long direction, for passing through the tie steel bars;

[0012] (2) Use several steel bars with a spacing of 400 mm × 400 mm. Arrange the two fabricated second steel plates vertically with their surfaces facing each other and weld them to form a lower steel plate frame. Weld several steel bars in parallel at equal distances between the steel plate frames, so that the center-to-center distance between the two steel plates is 300 mm;

[0013] c. Fabricate a precast reinforced concrete wall with an embedded steel plate welded connection form, including the following steps:

[0014] (1) Fabricate the first layer of steel bar mesh. In the non-reinforcement encryption area of the first layer of steel bar mesh, grade III steel Φ12@200 is used, single-layer and two-way. In the reinforcement encryption area, grade III steel Φ12@100 is used, single-layer and two-way;

[0015] (2) Install the upper steel plate frame and the lower steel plate frame on the upper and lower parts of the first layer of steel bar mesh respectively;

[0016] (3) Fabricate the second layer of steel bar mesh on the steel plate frame. In the non-reinforcement encryption area of the second layer of steel bar mesh, grade III steel Φ12@200 is used, single-layer and two-way. In the reinforcement encryption area, grade III steel Φ12@100 is used, single-layer and two-way; Make the first layer of steel bar mesh and the second layer of steel bar mesh clamp on both sides of the upper steel plate frame and the lower steel plate frame;

[0017] (4) Install steel bars in the upper steel plate frame and the lower steel plate frame respectively. The steel bar specification is grade III steel Φ12@100×100;

[0018] (5) Place the fabricated precast concrete wall steel bar mesh and steel plate frame with embedded steel plates welded together in a finished mold with dimensions of 3000 mm in height × 2230 mm in width × 400 mm in thickness of the precast wall. After controlling the steel bar cover, pour C30 concrete, and perform watering curing or steam curing. After reaching the strength, remove the formwork and hoist it to the finished product storage area;

[0019] d. Installation of the precast reinforced concrete wall with the upper and lower finished embedded steel plates welded together, including the following steps:

[0020] (1) Place the precast floor slab at both ends of the lower precast reinforced concrete wall, lay the upper steel bars of the precast floor slab, then pour the concrete for the cast-in-place part of the composite slab, and perform curing;

[0021] (2) After the concrete for the cast-in-place part of the composite slab reaches the strength, align the lower part of the upper precast reinforced concrete wall with the embedded steel plates welded together and the upper part of the lower precast reinforced concrete wall with the embedded steel plates welded together, and perform welding. The weld height of the weld is 12 mm. At the same time, install the structural steel bars for the post-cast part of the precast wall. The structural steel bars are grade III steel Φ10, and the stirrups are grade III steel Φ10@100;

[0022] (3) After closing the post-cast part of the precast wall with formwork, use fine aggregate concrete or grout with a strength grade one higher than that of the precast wall. After reaching the strength, remove the formwork and perform curing.

[0023] The construction method of the precast reinforced concrete wall with the embedded steel plates welded together of the present invention can also be further realized by adopting the following technical measures.

[0024] In the foregoing method, the steel plate material is Q235 steel plate.

[0025] In the foregoing method, the steel plate thickness is ≥12 mm.

[0026] In the foregoing method, the size of the first square hole is ≥33 mm × 46 mm.

[0027] In the foregoing method, the size of the second square hole is ≥140 mm × 140 mm.

[0028] In the foregoing method, the steel bar specification is grade III steel Φ12 mm steel bars with a length of 300 mm.

[0029] In the foregoing method, the precast reinforced concrete wall.

[0030] After adopting the above technical solutions, the construction method of the precast reinforced concrete wall with the embedded steel plates welded together of the present invention has the following advantages:

[0031] 1. The welded connection form can ensure the reliability of the connection between the upper and lower shear walls at the joint very well;

[0032] 2. The precast wall combines the design methods of reinforced concrete and steel plate concrete, which can well ensure the connection quality of the upper and lower precast walls and speed up the installation speed of workers;

[0033] 3. It can enable the upper precast reinforced concrete wall and the lower precast reinforced concrete wall to be quickly connected at the same time, and has good structural connection force-bearing performance, making the connection of the precast wall structure more visible, and the concealed acceptance work simpler and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is the plan view of the upper connecting steel plate structure of the precast reinforced concrete wall according to the embodiment of the present invention;

[0035] Figure 2 is Figure 1 the side view of;

[0036] Figure 3 It is the plan view of the lower connecting steel plate structure of the precast reinforced concrete wall according to the embodiment of the present invention;

[0037] Figure 4 is Figure 3 the side view of;

[0038] Figure 5 It is the internal structure diagram of the precast reinforced concrete wall with an embedded steel plate welded connection form according to the embodiment of the present invention;

[0039] Figure 6 is Figure 5 the sectional view taken along A-A in;

[0040] Figure 7 It is the connection schematic diagram of the precast reinforced concrete wall with an embedded steel plate welded connection form according to the embodiment of the present invention;

[0041] Figure 8 is Figure 7 the right view of;

[0042] Figure 9 is Figure 7 the left view of;

[0043] Figure 10 It is the precast reinforced concrete wall with an embedded steel plate welded connection form according to the embodiment of the present invention.

[0044] In the figure:

[0045] 1 - Upper precast reinforced concrete wall with an embedded steel plate welded connection form;

[0046] 2 - Prefabricated reinforced concrete wall with welded connection form of embedded steel plate in the lower slab;

[0047] 3 - Prefabricated floor slab;

[0048] 4 - Cast - in - place part of the composite slab concrete;

[0049] 5 - Post - cast part of the precast wall bottom concrete, fine aggregate concrete or C60 grouting material with a strength grade one higher than that of the precast wall;

[0050] 6 - Embedded welded connection steel plate at the lower part of the prefabricated reinforced concrete wall, 12 mm thick, Q235 steel plate;

[0051] 7 - Steel bars, grade III steel Φ12 mm @ 400 mm X 400 mm, length 300 mm;

[0052] 8 - Weld seam, weld height = 12 mm;

[0053] 9 - Structural steel bars in the post - cast part of the precast wall, grade III steel Φ12, tie steel bars grade III steel Φ12 @ 200;

[0054] 10 - Embedded welded connection steel plate at the upper part of the prefabricated reinforced concrete wall, 12 mm thick, Q235 steel plate;

[0055] 11 - Edge - sealing steel bars of the prefabricated reinforced concrete wall, grade III steel 2Φ12;

[0056] 12 - Steel bar encryption area, grade III steel Φ12 @ 100 double - layer and double - direction, tie steel bars grade III steel Φ12 @ 100×100;

[0057] 13 - Height of the prefabricated reinforced concrete wall (H = 3000 mm);

[0058] 14 - Width of the prefabricated reinforced concrete wall (L = 2230 mm); 15 - 140 mm×140 mm square holes for passing through slab steel bars and tie steel bars;

[0059] 16 - 40 mm×66 mm square holes for passing through tie steel bars;

[0060] 17 - The first layer of steel bar mesh;

[0061] 18 - The second layer of steel bar mesh;

[0062] 19 - Width of the connection steel plate L1 = 2200 mm;

[0063] 20 - Wall width B = 400 mm;

[0064] 21 - Prefabricated reinforced concrete wall. Detailed implementation mode

[0065] The present invention will be further described below in conjunction with the embodiments and their accompanying drawings. Embodiment

[0066] The construction method of the precast reinforced concrete wall with the embedded steel plate welding connection form of the present invention includes the following steps:

[0067] a. Fabricate the upper embedded welded connection steel plate of the precast reinforced concrete wall, including the following steps:

[0068] (1) Take 1 piece of Q235 grade 1 steel plate with dimensions of 2200mm×1050mm×12mm, and divide it into two parts along the short direction of the steel plate: the upper part is 2200mm×50mm, and the lower part is 2200mm×1000mm (the part buried in the precast wall). In the upper part of the embedded welded connection steel plate, square holes with dimensions of 33mm×46mm 16 are opened at intervals of 50mm, 100mm, 100mm,..., 100mm, 57mm along the long direction in sequence for passing through the wall reinforcement; in the lower part buried in the precast wall, square holes with dimensions of 140mm×140mm 15 are opened at intervals of 200mm, 30mm away from the edges of the long and short directions, for passing through the floor slab reinforcement and the wall reinforcement.

[0069] Fabricate another 10 pieces of Q235 grade 1 steel plates with dimensions of 2200mm×1050mm×12mm in the same way.

[0070] (2) Use 300mm long grade 3 steel bars with a diameter of Φ12mm, spaced at 400mm×400mm, to weld the two fabricated 2200mm×1050mm×12mm Q235 steel plates to form a steel plate frame, with a center-to-center distance of 300mm between the two steel plates.

[0071] Please refer to Figure 1-2 , Figure 1 which is the plan view of the upper connection steel plate structure of the precast reinforced concrete wall in the embodiment of the present invention, Figure 2 and Figure 1 is the side view of

[0072] b. Fabricate the lower embedded welded connection steel plate of the precast reinforced concrete wall, including the following steps:

[0073] (1) Take a Q235 steel plate 6 with dimensions of 2200mm×850mm×12mm and divide it into two parts along the short direction of the steel plate: the upper part is 2200mm×800mm, and the lower part is 2200mm×50mm. In the upper part, embed the precast wall part. At a distance of 30mm from the edges in both the long and short directions, square holes with a size of 140mm×140mm (15) are opened at intervals of 200mm for passing through the wall reinforcement bars. In the lower part, square holes with sizes of 33mm×46mm (16), 33mm×66mm16, ……, 33mm×66mm16, 33mm×66mm16 are opened at intervals of 50mm, 100mm, 100mm, 100mm, ……, 100mm, 50mm along the long direction for passing through the wall reinforcement bars.

[0074] Perform the same operation to fabricate another Q235 steel plate 6 with dimensions of 2200mm×1100mm×12mm.

[0075] (2) Use 300mm long grade - 3 steel Φ12mm reinforcement bars 7 with a spacing of 400mm×400mm to weld the two fabricated Q235 steel plates with dimensions of 2200mm×9100mm×12mm to form a steel plate frame, with a parallel spacing of 300mm between the two steel plates.

[0076] Please refer to Figure 3-4 , Figure 3 which is the plan view of the lower - connecting steel plate structure of the precast reinforced concrete wall in the embodiment of the present invention, Figure 4 and Figure 3 is the side view of

[0077] c. Fabricate a precast reinforced concrete wall with an embedded steel plate welded connection form, including the following steps:

[0078] (1) Fabricate the first layer of steel mesh 17. In the non - steel - reinforcement - encrypted area of the first - layer steel mesh sheet, grade - 3 steel Φ12@200 is used, arranged in a single - layer and two - way manner. In the steel - reinforcement - encrypted area, grade - 3 steel Φ12@100 is used, arranged in a single - layer and two - way manner;

[0079] (2) Install the upper steel plate frame and the lower steel plate frame on the upper and lower parts of the first layer of steel mesh respectively;

[0080] (3) Fabricate the second layer of steel mesh 18 on the steel plate frame. In the non - steel - reinforcement - encrypted area of the second - layer steel mesh, grade - 3 steel Φ12@200 is used, arranged in a single - layer and two - way manner. In the steel - reinforcement - encrypted area, grade - 3 steel Φ12@100 is used, arranged in a single - layer and two - way manner; clamp the first layer of steel mesh 17 and the second layer of steel mesh 18 on both sides of the upper steel plate frame and the lower steel plate frame;

[0081] (4) Install wall reinforcement bars 7 in the upper steel plate frame and the lower steel plate frame respectively. The specification of the reinforcement bars is grade - 3 steel Φ12@100×100;

[0082] (5) Place the fabricated precast concrete wall steel bar mesh and steel plate frame with embedded steel plates welded together in a finished mold with a height of 3000 mm of the precast wall, a width of 2230 mm of the precast wall, and a thickness of 400 mm of the precast wall. After controlling the steel bar protective layer, pour C30 concrete, and carry out watering curing or steam curing. After reaching the strength, remove the formwork and hoist it to the finished product storage area;

[0083] Please refer to Figure 5-6 and Figure 10 , Figure 5 which is the internal structure diagram of the precast reinforced concrete wall with embedded steel plates welded together according to the embodiment of the present invention, Figure 6 is Figure 5 the sectional view taken along A-A in Figure 10 and is the precast reinforced concrete wall with embedded steel plates welded together according to the embodiment of the present invention.

[0084] d. Installation of the upper and lower finished precast reinforced concrete walls with embedded steel plates welded together, including the following steps:

[0085] (1) After laying the precast floor slab 3 at both ends of the lower precast reinforced concrete wall 2 with embedded steel plates welded together, lay the upper steel bars of the precast floor slab (grade III steel Φ10@150), and then pour the cast-in-place part of the composite slab concrete 4 (C30), and carry out curing.

[0086] (2) After the cast-in-place part of the composite slab concrete 4 reaches the strength, align the lower part of the upper precast reinforced concrete wall 1 with embedded steel plates welded together with the upper part of the lower precast reinforced concrete wall 2 with embedded steel plates welded together, and carry out welding. The weld 8, the weld height is 12 mm. At the same time, install the structural steel bars of the post-cast part of the precast wall, grade III steel Φ10, and the stirrups, grade III steel Φ10@100, structural steel bars 9. Figure 7 which is the connection schematic diagram of the precast reinforced concrete wall with embedded steel plates welded together according to the embodiment of the present invention, Figure 8 is Figure 7 the right view of Figure 9 and is Figure 7 the left view of

[0087] (3) After closing the post-cast part of the precast wall with formwork, use fine aggregate concrete (C35) or C60 grouting material 5 with a strength grade one higher than that of the precast wall. After reaching the strength, remove the formwork and carry out curing. Figure 10 and is the precast reinforced concrete wall with embedded steel plates welded together according to the embodiment of the present invention.

[0088] The present invention has substantial features and remarkable technological progress. The construction method of the precast reinforced concrete wall with an embedded steel plate welded connection form of the present invention is different from the steel bar connection methods of the standard steel bar sleeve grouting connection form, the steel bar slurry anchor lap joint connection form, and the double-sided composite shear wall connection form. Instead, it adopts a high-strength welding connection form, which can very well ensure the connection reliability of the nodes between the upper shear wall and the lower shear wall, can well ensure the connection quality of the upper and lower precast walls, and speed up the installation speed of workers. Its precast wall combines the design methods of reinforced concrete and steel plate concrete. The construction method of the precast reinforced concrete wall with an embedded steel plate welded connection form of the present invention can enable the upper precast reinforced concrete wall with an embedded steel plate welded connection form and the lower precast reinforced concrete wall with an embedded steel plate welded connection form to be quickly and reliably connected at the same time, and has good structural connection stress performance, making the structural nodes of the precast concrete wall have larger and better structural stress performance. At the same time, the connection of the precast wall structural nodes is more visible, and the concealed acceptance work is simpler and more reliable.

[0089] The above embodiments are only for illustrating the present invention and not for limiting the present invention. Those skilled in the relevant technical fields can also make various transformations or changes without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by each claim.

Claims

1. A construction method for a precast reinforced concrete wall with an embedded steel plate welded connection form, characterized in that It includes the following steps: a. Fabricate the upper embedded welded connection steel plate for the precast reinforced concrete wall, including the following steps: (1) Take two rectangular first steel plates (10) with the same thickness and size of 2200mm×1050mm. Divide them along the short direction of the steel plate into two parts: the upper steel plate of the connection part with a size of 2200mm×50mm and the lower steel plate of the part buried in the precast wall with a size of 2200mm×1000mm. On the upper steel plate of the connection part, a number of first square holes (16) are arranged at intervals of 50mm and 100mm in sequence along the long direction for passing the tie bars. In the lower part buried in the precast wall, a number of second square holes (15) are opened at intervals of 200mm at a distance of 30mm from the edges of the long direction and the short direction for passing the floor slab steel bars and tie bars; (2) Use a number of steel bars (7) with a spacing of 400mm×400mm to arrange and weld the two fabricated rectangular first steel plates (10) upright with their surfaces facing each other to form an upper steel plate frame. A number of steel bars (7) are welded in parallel at equal distances between the steel plate frames so that the distance between the two steel plates is 300mm; b. Fabricate the lower embedded welded connection steel plate for the precast reinforced concrete wall, including the following steps: (1) Take two rectangular second steel plates (6) with the same thickness and size of 2200mm×850mm. Divide them along the short direction of the steel plate into two parts: the upper steel plate of the part buried in the precast wall with a size of 2200mm×800mm and the lower steel plate of the connection part with a size of 2200mm×50mm. In the upper steel plate of the part buried in the precast wall, a number of second square holes (15) are opened at intervals of 200mm at a distance of 30mm from the edges of the long direction and the short direction for passing the tie bars. In the lower steel plate of the connection part, a number of first square holes (16) are arranged at intervals of 50mm and 100mm in sequence along the long direction for passing the tie bars; (2) Use a number of steel bars (7) with a spacing of 400mm×400mm to arrange and weld the two fabricated second steel plates (6) upright with their surfaces facing each other to form a lower steel plate frame. A number of steel bars (7) are welded in parallel at equal distances between the steel plate frames so that the distance between the two steel plates is 300mm; c. Fabricate the precast reinforced concrete wall with an embedded steel plate welded connection form, including the following steps: (1) Fabricate the first steel mesh sheet (17). In the non-reinforcement encryption area of the first steel mesh sheet, grade III steel Φ12@200 is used, single-layer and two-way. In the reinforcement encryption area, grade III steel Φ12@100 is used, single-layer and two-way; (2) Install the upper steel plate frame and the lower steel plate frame on the upper and lower parts of the first steel mesh respectively; (3) Fabricate the second steel mesh sheet (18) on the steel plate frame. In the non-reinforcement encryption area of the second steel mesh sheet, grade III steel Φ12@200 is used, single-layer and two-way. In the reinforcement encryption area, grade III steel Φ12@100 is used, single-layer and two-way. Make the first steel mesh sheet (17) and the second steel mesh sheet (18) clamp on both sides of the upper steel plate frame and the lower steel plate frame; (4) Install steel bars (7) with a specification of grade III steel Φ12@100×100 in the upper steel plate frame and the lower steel plate frame respectively; (5) Place the prefabricated concrete wall steel bar mesh and steel plate frame with the embedded steel plate welded connection form that has been processed and manufactured into a finished product mold with a height of 3000 mm (13) × width of 2230 mm (14) × thickness of 400 mm (20) of the prefabricated wall. After controlling the steel bar protection layer, pour C30 concrete, and carry out sprinkler curing or steam curing. After reaching the strength, remove the formwork and hoist it to the finished product storage area; d. Installation of the precast reinforced concrete wall with the welded connection form of the upper and lower finished embedded steel plates, including the following steps: (1) After placing the precast floor slab (3) at both ends of the lower precast reinforced concrete wall (2) with the welded connection form of the embedded steel plate, lay the upper layer of steel bars of the precast floor slab, then pour the concrete of the cast-in-place part (4) of the composite slab, and carry out curing; (2) After the concrete of the cast-in-place part (4) of the composite slab reaches the strength, align the lower part of the upper precast reinforced concrete wall (1) with the welded connection form of the embedded steel plate and the upper part of the lower precast reinforced concrete wall with the welded connection form of the embedded steel plate, and carry out welding. The weld height of the weld (8) is 12 mm. At the same time, install the structural steel bars (9) of the post-cast part of the precast wall. The structural steel bars are grade III steel Φ10, and the stirrups are grade III steel Φ10@100; (3) After closing the post-cast part of the precast wall with formwork, use grouting material (5) with a strength grade one higher than that of the precast wall. After reaching the strength, remove the formwork and carry out curing.

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