A grouting corrugated steel pipe truss prestressed concrete composite slab and a construction method thereof

Abstract

This invention discloses a grouting corrugated steel pipe truss prestressed concrete composite slab. Firstly, the thickness of the precast base slab is rationally set to prevent excessive thickness, which would increase self-weight, waste materials, and increase compressive strength, making it difficult to detect cracks during stress and leading to direct breakage, including the reinforcing bars, thus altering the stress distribution and potentially causing collapse. Secondly, high-strength grouting steel pipe trusses and prestressed steel bars are used as the bottom reinforcement of the slab, significantly improving the load-bearing capacity of the precast slab. Furthermore, the special structure of the web members greatly enhances the connection performance of the composite slab. Finally, the area where the prestressed steel bars completely penetrate the precast base slab is rationally designed to prevent the end reinforcement from affecting the binding effect of the end beam reinforcement.

Description

Technical Field

[0001] This invention relates to the field of concrete composite slab technology, and more specifically, to a grouting corrugated steel pipe truss prestressed concrete composite slab and its construction method. Background Technology

[0002] With the continuous development of the construction industry, the country has increasingly higher requirements for construction companies in terms of green construction, energy efficiency, environmental protection, and high-quality construction. Various new building materials and structural forms are constantly emerging. Among them, PC panels, as a new type of floor structure, have been widely used in the modern construction industry.

[0003] However, the current PC slabs have problems such as being thick, requiring a large amount of material, being heavy, needing to be cast in place for splicing two-way slabs, and having long reinforcing bars left at the slab ends, which affects the binding of the end beam reinforcement. This invention provides a grouting corrugated steel pipe truss prestressed concrete composite slab and a construction method. Summary of the Invention

[0004] The purpose of this invention is to provide a grouting corrugated steel pipe truss prestressed concrete composite slab to solve the problems of excessive thickness, low bearing capacity, and interference of end reinforcement with end beam reinforcement binding in existing composite slabs.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a grouting corrugated steel pipe truss prestressed concrete composite slab and a construction method, including a truss, the outer edge of which is completely covered by cement mortar grouting material to form a precast base plate, the thickness of which is 35-40mm.

[0006] Several web members are provided on the precast base plate. Each web member has a corrugated hollow steel pipe at the end away from the precast base plate. High-strength cement mortar is densely filled inside the corrugated hollow steel pipe.

[0007] The truss includes several horizontally arranged transverse steel reinforcement components, which are connected by a precast base plate. Each transverse steel reinforcement component includes two spaced-apart auxiliary transverse steel reinforcements, which are connected by web members.

[0008] The web member includes several single web members. Each single web member includes a support part arranged in pairs at intervals. The support part is inclined upward on the auxiliary transverse reinforcement. The end of the support part away from the auxiliary transverse reinforcement completely penetrates the precast base plate. The end of the support part away from the auxiliary transverse reinforcement is provided with a fixing part. The two ends of the fixing part are respectively connected to the support parts arranged in pairs at intervals. The end of the fixing part away from the support part is fixed with a corrugated hollow steel pipe.

[0009] The truss also includes several horizontally arranged prestressed steel bars, which are fixedly installed in the precast base slab. The prestressed steel bars are located at the lower end of the auxiliary transverse steel bars, and the axis of the prestressed steel bars is in the same direction as the extension direction of the auxiliary transverse steel bars. The area where the prestressed steel bars completely penetrate the precast base slab is 8mm-15mm.

[0010] The precast base plate includes a base, with inclined sections on both sides of the base. The inclined sections are connected by a top, and the base, inclined sections, and top are connected by an end.

[0011] By adopting the above technical solutions, firstly, the thickness of the precast base slab is reasonably set to prevent it from being too thick, which would increase its self-weight, waste materials, increase compressive strength, and make it difficult to detect cracks in the floor slab during the stress process. Instead, it would be damaged directly, including the reinforcing bars, changing the stress problem and leading to collapse accidents. Secondly, high-strength grouted steel pipe trusses and prestressed steel bars are used as bottom reinforcement of the slab, which can greatly improve the bearing capacity of the precast slab. Furthermore, the special structure of the web members greatly improves the connection performance of the composite slab. Finally, the area where the prestressed steel bars completely penetrate the precast base slab is reasonably set to prevent the end reinforcement of the slab from affecting the binding effect of the end beam reinforcement.

[0012] The invention is further configured such that: the outer edge of the fixing part extends upward to fit and cover the corrugated hollow steel pipe, the fixing part is disposed in the corrugated groove on the outer surface of the corrugated hollow steel pipe, and a number of welding points are provided at the connection between the fixing part and the corrugated hollow steel pipe.

[0013] By adopting the above technical solutions, the strength of the floor slab can be enhanced, preventing the floor slab from cracking and sinking if it is not reinforced during use due to the large weight and external forces it may bear.

[0014] The present invention is further configured such that: the fixing part is in the shape of a ring, the inner wall of the fixing part is provided with a plurality of connecting parts, the fixing part is connected to the corrugated hollow steel pipe through the connecting parts, and the connection between the fixing part and the corrugated hollow steel pipe is located in the corrugated groove on the outer surface of the corrugated hollow steel pipe.

[0015] By adopting the above technical solution, the connection effect between the precast base plate and the corrugated hollow steel pipe can be further improved, and the connection between the web member and the corrugated hollow steel pipe can be prevented from cracking directly due to excessive stress.

[0016] The present invention is further configured such that: a snap-fit ​​part is provided at one end of the support part near the transverse reinforcing bar of the attachment, and the support part and the transverse reinforcing bar of the attachment are connected by the snap-fit ​​part.

[0017] By adopting the above technical solution, the connection effect between the precast base plate and the corrugated hollow steel pipe can be further improved.

[0018] The present invention is further configured such that: the prestressed steel bar includes a prestressed part, the prestressed part is fixedly disposed in the precast base plate, the prestressed part is located at the lower end of the accessory transverse steel bar, and the axis of the prestressed part is in the same direction as the extension direction of the accessory transverse steel bar, and the two ends of the prestressed part are respectively provided with a shank rib, the shank rib completely penetrates the precast base plate, and the length of the shank rib penetrating the precast base plate is 10mm.

[0019] By adopting the above technical solution, the effect of the slab end reinforcement on the end beam reinforcement binding can be improved.

[0020] The present invention is further configured such that: a rough layer is provided at the end, the inclined portion, and the top, and the included angle between the inclined portion and the base is 70°-80°.

[0021] By adopting the above technical solution, the four sides of the slab are made of rough concrete and the inverted V-shaped joint structure can better bond with the later-poured concrete surface, improve the construction quality, and avoid quality problems such as leakage at the slab joints.

[0022] The invention is further configured such that the end of the web member away from the precast base plate is connected to the corrugated hollow steel pipe via a galvanized steel pipe sleeve.

[0023] By adopting the above technical solution, the welding difficulty of corrugated hollow steel pipes and web members can be reduced.

[0024] The present invention is further configured to include the following steps:

[0025] S1. Height of the first layer of cement mortar grout;

[0026] S2. Prestressed steel bars are evenly distributed;

[0027] S3. Height of the second layer of cement mortar grout;

[0028] S4. Arrange transverse steel reinforcement components evenly, and assemble single web reinforcement to complete the truss assembly;

[0029] S5. Height of the third layer of cement mortar grout;

[0030] S6. Assemble corrugated hollow steel pipes;

[0031] Compact the cement mortar grout after pouring it.

[0032] When all the poured cement mortar grouting material is ground, the outer surface of the precast base plate is polished.

[0033] By adopting the above technical solutions, the quality of laminated boards can be improved, and manufacturing process problems can be prevented from reducing the quality of laminated boards.

[0034] The present invention is further configured such that the pouring height in steps S1, S3, and S5 is one-third of the precast base plate.

[0035] By adopting the above technical solutions, the quality of composite slabs can be further improved.

[0036] In summary, the present invention has the following beneficial effects: First, the thickness of the precast base slab is reasonably set to prevent the precast base slab from being too thick, which would increase its self-weight, waste materials, increase compressive strength, and make it easy for the floor slab to be difficult to detect cracks during the stress process, resulting in direct breakage of the reinforcing bars, changing the stress problem and leading to collapse accidents. Second, the use of high-strength grouted steel pipe trusses and prestressed steel bars as bottom reinforcement of the slab can greatly improve the bearing capacity of the precast slab, and the special structure of the web members greatly improves the connection performance of the composite slab. Finally, the area where the prestressed steel bars completely penetrate the precast base slab is reasonably set to prevent the end reinforcement of the slab from affecting the binding effect of the end beam reinforcement. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the web member in an embodiment of the present invention;

[0038] Figure 2 This is a cross-sectional view of a greenhouse gas monitoring device for a prestressed concrete composite slab with grouting corrugated steel pipe truss according to an embodiment of the present invention.

[0039] Figure 3 This is a longitudinal view of a greenhouse gas monitoring device for a prestressed concrete composite slab with grouting corrugated steel pipe truss according to an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the structure of a greenhouse gas monitoring device for a grouting corrugated steel pipe truss prestressed concrete composite slab in an embodiment of the present invention.

[0041] In the diagram: 1. Truss; 11. Web member; 111. Single web member reinforcement; 111a. Support; 111b. Fixing; 111c. Connection; 111d. Clip-on; 12. Transverse reinforcement; 13. Prestressed reinforcement; 131. Prestressed section; 132. Beard reinforcement; 2. Precast base slab; 21. Base; 22. Inclined section; 23. Top; 24. End; 3. Corrugated hollow steel pipe. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1 —4. The present invention will be described in further detail.

[0043] Example

[0044] like Figure 1 - Figure 4As shown, a prestressed concrete composite slab with a grouted corrugated steel pipe truss 1 and a construction method thereof includes a truss 1, the outer edge of which is completely covered by cement mortar grout to form a precast base slab 2, the thickness of which is 35-40mm.

[0045] Several web members 11 are provided on the precast base plate 2. Each web member 11 is provided with a corrugated hollow steel pipe 3 at the end away from the precast base plate 2. High-strength cement mortar is densely filled inside the corrugated hollow steel pipe 3.

[0046] The truss 1 includes several horizontally arranged transverse steel reinforcement components 12, which are connected by a precast base plate 2. Each transverse steel reinforcement component 12 includes two spaced-apart auxiliary transverse steel reinforcements, which are connected by a web member 11.

[0047] The web member component 11 includes a plurality of single web members 111. Each single web member 111 includes a support portion 111a arranged in pairs at intervals. The support portion 111a is inclined upward on the auxiliary transverse reinforcement. The end of the support portion 111a away from the auxiliary transverse reinforcement completely penetrates the precast base plate 2. The end of the support portion 111a away from the auxiliary transverse reinforcement is provided with a fixing portion 111b. The two ends of the fixing portion 111b are respectively connected to the support portions 111a arranged in pairs at intervals. The end of the fixing portion 111b away from the support portion 111a is fixedly provided with a corrugated hollow steel pipe 3.

[0048] The fixing part 111b is annular, and a plurality of connecting parts 111c are provided on the inner wall of the fixing part 111b. The fixing part 111b is connected to the corrugated hollow steel pipe 3 through the connecting parts 111c, and the connection between the fixing part 111b and the corrugated hollow steel pipe 3 is located in the corrugated groove on the outer surface of the corrugated hollow steel pipe 3.

[0049] The truss 1 also includes several horizontally arranged prestressed steel bars 13. The prestressed steel bars 13 are fixedly installed in the precast base plate 2. The prestressed steel bars 13 are located at the lower end of the auxiliary transverse steel bars, and the axis of the prestressed steel bars 13 is in the same direction as the extension direction of the auxiliary transverse steel bars. The area in which the prestressed steel bars 13 completely penetrate the precast base plate 2 is 8mm-15mm.

[0050] The outer edge of the fixing part 111b extends upward to fit and cover the corrugated hollow steel pipe 3. The fixing part 111b is located in the corrugated groove on the outer surface of the corrugated hollow steel pipe 3, and several welding points are provided at the connection between the fixing part 111b and the corrugated hollow steel pipe 3.

[0051] The support part 111a is provided with a snap-fit ​​part 111d at one end near the transverse reinforcement of the accessory, and the support part 111a and the transverse reinforcement of the accessory are connected by the snap-fit ​​part 111d.

[0052] The prestressed steel bar 13 includes a prestressed part 131, which is fixedly installed in the precast base plate 2. The prestressed part 131 is located at the lower end of the accessory transverse steel bar, and the axis of the prestressed part 131 is in the same direction as the extension direction of the accessory transverse steel bar. The prestressed part 131 is provided with a reinforcing bar 132 at both ends, and the reinforcing bar 132 completely penetrates the precast base plate 2.

[0053] As a preferred option, to prevent the smooth concrete surface of the precast base slab 2 from easily causing leakage at the slab joints, the precast base slab 2 includes a base 21, with inclined portions 22 respectively provided on both sides of the base 21. The inclined portions 22 are connected to each other through a top 23, and the base 21, the inclined portions 22, and the top 23 are connected through an end 24.

[0054] The end 24, the inclined portion 22, and the top 23 are provided with a rough layer, and the included angle between the inclined portion 22 and the base 21 is 70°-80°.

[0055] As a preferred option: to solve the problem of the end reinforcement affecting the binding of the end 24 beam reinforcement, the length of the reinforcing bar 132 penetrating through the precast bottom slab 2 section is 10mm.

[0056] As a preferred option, to reduce the welding difficulty of the corrugated hollow steel pipe 3 and the web member 11, the end of the web member 11 away from the precast base plate 2 is connected to the corrugated hollow steel pipe 3 by a galvanized steel pipe sleeve.

[0057] As a preferred option, the prestressed steel bar 13 is a 1570 grade stress-relieving steel wire.

[0058] First, the thickness of the precast base slab 2 should be set reasonably to prevent it from being too thick, which would increase its self-weight, waste materials, increase its compressive strength, and make it difficult to detect cracks in the floor slab during the stress process. Instead, it would be damaged directly, including the steel bars, which would change the stress problem and lead to a collapse accident. Second, high-strength grouted steel pipe truss 1 and prestressed steel bars 13 are used as bottom reinforcement of the slab, which can greatly improve the bearing capacity of the precast slab. Furthermore, the special structure of the web member 11 greatly improves the connection performance of the composite slab. Finally, the area where the prestressed steel bars 13 completely penetrate the precast base slab 2 should be set reasonably to prevent the end reinforcement of the slab from affecting the binding effect of the end beam reinforcement of the 24 beam.

[0059] The single-web steel bar 111 includes two spaced-apart support portions 111a, which are inclined upwards on the attached transverse steel bar. A fixing portion 111b is provided at the end of the support portion 111a away from the attached transverse steel bar. Several connecting portions 111c are provided on the inner wall of the fixing portion 111b. The fixing portion 111b is connected to the corrugated hollow steel pipe 3 through the connecting portions 111c. The connection between the fixing portion 111b and the corrugated hollow steel pipe 3 is located in the corrugated groove on the outer surface of the corrugated hollow steel pipe 3. A snap-fit ​​portion 111d is provided at the end of the support portion 111a near the attached transverse steel bar. The support portion 111a is connected to the attached transverse steel bar through the snap-fit ​​portion 111d. The connection effect is improved by the interaction between the various components on the single-web steel bar 111 and the corrugated hollow steel pipe 3 and the precast base plate 2 itself, preventing the various components from falling off each other.

[0060] This invention also provides a construction process for a grouting corrugated steel pipe truss 1 prestressed concrete composite slab, applicable to any of the grouting corrugated steel pipe truss 1 prestressed concrete composite slabs described above, including the following steps:

[0061] S1. Height of the first layer of cement mortar grout;

[0062] S2. Evenly distribute prestressed steel bars 13;

[0063] S3. Height of the second layer of cement mortar grout;

[0064] S4. Arrange the transverse steel reinforcement components 12 evenly, and assemble the single web reinforcement 111 at the same time to complete the truss 1 assembly;

[0065] S5. Height of the third layer of cement mortar grout;

[0066] S6. Assemble corrugated hollow steel pipe 3;

[0067] Compact the cement mortar grout after pouring it.

[0068] When all the poured cement mortar grouting material is ground, the outer surface of the precast base plate 2 is polished.

[0069] As a preferred option, the pouring height in steps S1, S3, and S5 is one-third of the height of the precast base plate 2.

[0070] Working principle: High-strength cement mortar is injected into the corrugated hollow steel pipe 3, and the web member component 11 and the snap-fit ​​part 111d are welded to the transverse steel reinforcement component 12 to form a high-strength steel pipe steel truss 1. This connects the upper and lower layers of steel reinforcement in the concrete floor slab, forming a small spatial truss 1 capable of bearing spatial loads. The corrugated hollow steel pipe 3 can better bond with the post-cast concrete layer. It can achieve unidirectional reinforcement and a minimum bottom slab thickness of 35mm. By unidirectional reinforcement at the slab end, leaving only a 10mm long spur bar 132 on one side, the thickness of the precast slab is reduced and the load-bearing capacity of the floor slab is increased, while solving the problem of the slab end reinforcement affecting the binding of the end beam 24 reinforcement. The improvement is that the four sides of the slab are rough concrete surfaces and the inverted V-shaped joint structure can better bond with the post-cast concrete surface and improve the construction quality.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A grouting corrugated steel pipe truss prestressed concrete composite slab, characterized in that: The truss (1) is included. The outer edge of the truss (1) is completely covered by cement mortar grout to form a precast base plate (2). The thickness of the precast base plate (2) is 35-40mm. Several web members (11) are provided on the precast base plate (2). Each web member (11) is provided with a corrugated hollow steel pipe (3) at one end away from the precast base plate (2). The corrugated hollow steel pipe (3) is filled with high-strength cement mortar. The truss (1) includes several horizontally arranged transverse steel reinforcement components (12), which are connected by a precast base plate (2). Each transverse steel reinforcement component (12) includes two adjacent transverse steel reinforcements spaced apart, which are connected by a web member component (11). The web member (11) includes several single web members (111), each web member (111) includes a support part (111a) arranged in pairs at intervals. The support part (111a) is inclined upward on the auxiliary transverse reinforcement, and the end of the support part (111a) away from the auxiliary transverse reinforcement completely penetrates the precast base plate (2). The end of the support part (111a) away from the auxiliary transverse reinforcement is provided with a fixing part (111b), and the two ends of the fixing part (111b) are respectively connected to the support parts (111a) arranged in pairs at intervals. The end of the fixing part (111b) away from the support part (111a) is fixedly provided with a corrugated hollow steel pipe (3). The outer edge of the fixing part (111b) extends upward to fit and cover the corrugated hollow steel pipe (3). The fixing part (111b) is located in the corrugated groove on the outer surface of the corrugated hollow steel pipe (3), and several welding points are provided at the connection between the fixing part (111b) and the corrugated hollow steel pipe (3). The support part (111a) is provided with a snap-fit ​​part (111d) at one end near the transverse reinforcement of the accessory, and the support part (111a) and the transverse reinforcement of the accessory are connected by the snap-fit ​​part (111d); The truss (1) also includes several horizontally arranged prestressed steel bars (13). The prestressed steel bars (13) are fixedly installed in the precast base plate (2). The prestressed steel bars (13) are located at the lower end of the auxiliary transverse steel bars, and the axis of the prestressed steel bars (13) is in the same direction as the extension direction of the auxiliary transverse steel bars. The area where the prestressed steel bars (13) completely penetrate the precast base plate (2) is 8mm-15mm. The precast base plate (2) includes a base (21), and inclined portions (22) are respectively provided on both sides of the base (21) at an upward angle. The inclined portions (22) are connected to each other through a top (23), and the base (21), inclined portions (22), and top (23) are connected through an end (24).

2. The grouting corrugated steel pipe truss prestressed concrete composite slab according to claim 1, characterized in that: The fixing part (111b) is annular, and the inner wall of the fixing part (111b) is provided with several connecting parts (111c). The fixing part (111b) is connected to the corrugated hollow steel pipe (3) through the connecting parts (111c), and the connection between the fixing part (111b) and the corrugated hollow steel pipe (3) is located in the corrugated groove on the outer surface of the corrugated hollow steel pipe (3).

3. The grouting corrugated steel pipe truss prestressed concrete composite slab according to claim 1, characterized in that: The prestressed steel bar (13) includes a prestressed part (131), which is fixedly installed in the precast base plate (2). The prestressed part (131) is located at the lower end of the accessory transverse steel bar, and the axis of the prestressed part (131) is in the same direction as the extension direction of the accessory transverse steel bar. The two ends of the prestressed part (131) are respectively provided with a shank bar (132), which completely penetrates the precast base plate (2), and the length of the shank bar (132) penetrating the precast base plate (2) is 10mm.

4. The grouting corrugated steel pipe truss prestressed concrete composite slab according to claim 1, characterized in that: The end (24), the inclined portion (22), and the top (23) are provided with a rough layer, and the angle between the inclined portion (22) and the base (21) is 70°-80°.

5. A construction process for a grouting corrugated steel pipe truss prestressed concrete composite slab, characterized in that: The method, applied to any one of the grouting corrugated steel pipe truss prestressed concrete composite slabs as described in claims 1-4, includes the following steps: S1. Height of the first layer of cement mortar grout; S2. Evenly distribute prestressed steel bars (13); S3. Height of the second layer of cement mortar grout; S4. Arrange the transverse steel reinforcement components (12) evenly, and assemble the single web reinforcement (111) at the same time to complete the truss (1) assembly; S5. Height of the third layer of cement mortar grout; S6. Assemble corrugated hollow steel pipes (3); Compact the cement mortar after pouring the grout. When all the poured cement mortar grouting material is ground, the outer surface of the precast base plate (2) is polished.

6. The construction process of a grouting corrugated steel pipe truss prestressed concrete composite slab according to claim 5, characterized in that: The pouring height of steps S1, S3, and S5 is one-third of the precast base plate (2).

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