Pre-tensioning method prestress variable-strength concrete prefabricated part

Abstract

The utility model provides a pretensioning method prestressing force variable strength concrete prefabricated component, which comprises a component concrete body, a prestressing force steel strand and a reinforcing steel bar, the component concrete body comprises a high-strength concrete body and a low-strength concrete body, the high-strength concrete body adopts high-strength concrete with a compressive strength standard value of 60-200MPa, the low-strength concrete body adopts high-strength concrete with a compressive strength standard value of 60-200MPa, and the high-strength concrete body adopts high-strength concrete with a compressive strength standard value of 60-200MPa. The high-strength concrete body wraps the prestressed steel strand in the high-strength concrete body, the low-strength concrete body is made of low-strength concrete with the compressive strength standard value of 30-50 MPa, and the low-strength concrete body is arranged above the high-strength concrete body or surrounds the high-strength concrete body in a half mode from the upper portion and the two end faces of the high-strength concrete body. The concrete of the low-strength concrete body and the concrete of the high-strength concrete body are combined into a whole in a layered pouring mode. According to the design, under the condition that the bearing capacity requirement of the component is met, the performance of concrete with different strengths is fully exerted, the cross section height and the self weight of the component can be properly reduced, the cost performance of the prestressed component is improved, and the problems that in the prior art, materials of a prefabricated component cannot be fully utilized, and the performance and the cost of the prefabricated component are difficult to balance are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of building construction, and particularly relates to a pre-tensioning method prestressed variable strength concrete prefabricated component. BACKGROUND

[0002] The pre-tensioning method prefabricated concrete component such as the pre-tensioning method prestressed composite beam, the pre-tensioning method prestressed double beam plate, the pre-tensioning method prestressed channel plate has the characteristics such as larger span, stronger bearing capacity and better crack resistance, and is widely applied in building engineering.However, the prefabricated component of the prior art usually adopts single concrete with the strength grade in the range of C30-C50, the internal stress of the prestressed component is uneven in actual application, the concrete compressive strength of the whole prefabricated component is the same in the prior art, and the strength performance of the concrete cannot be optimally configured.The concrete in the pre-compression area of the component during the tensioning stage will bear a large compressive stress, the compressive strength of C30-C50 concrete is not high, the pre-compressive stress that can be applied is not large, which can cause the performance of the steel wire to not be fully utilized, and the bearing capacity and crack resistance of the prefabricated component are reduced.In the prior art, when the compressive strength of the concrete in the pre-compression area of the component during the tensioning stage is insufficient, the cross-sectional size of the component is usually increased to reduce the pre-compressive stress of the concrete, so that the volume of the component is increased, the self weight is increased, and the amount of concrete is increased, which can cause the problems of increased material and hoisting costs, reduced floor net height, and the like.Using high-strength concrete in the whole component can cause the problems of increased material cost and wasted materials due to the fact that part of the concrete cannot be fully utilized.Due to the problems of high cost and technical process of high-strength concrete, the pre-tensioning method prestressed variable strength concrete prefabricated component has not been applied yet.As described above, the material performance of the prefabricated component in the prior art cannot be fully utilized, and the performance and cost are difficult to balance, and a pre-tensioning method prestressed variable strength concrete prefabricated component with large bearing capacity, small cross section and self weight, high performance-price ratio and fully utilized materials has not been reported yet. SUMMARY

[0003] The utility model wants to solve the technical problem that the material performance of the prestressed concrete prefabricated component in the prior art cannot be fully utilized, and the performance and cost are difficult to balance.

[0004] The utility model provides a bear big, cross section and self -weight small, cost -effective, material full use's pre -stressing method prestressed variable strength concrete prefabricated component, including component concrete, prestressed steel strand and reinforcing steel bar, the component concrete includes high strength concrete and low strength concrete, the high strength concrete adopts high strength concrete of 60-200MPa of compressive strength standard value, the high strength concrete is wrapped its inside the prestressed steel strand, the low strength concrete adopts low strength concrete of 30-50MPa of compressive strength standard value, the low strength concrete is in the high strength concrete top or from top and two end surfaces half surrounds the high strength concrete, the high strength concrete and the low strength concrete concrete layered pouring combination is integrated.

[0005] According to the prefabricated component of pre-tensioning method prestressed variable strength concrete provided by the utility model still has the following subsidiary technical features:

[0006] The cross section of the component concrete is a vertical rectangle with height greater than width.

[0007] The cross section of the component concrete is an isosceles inverted trapezoid with width greater than height. The cross section of the component concrete is a "T" shape formed by the combination of the upper wide and flat isosceles inverted trapezoid and the lower narrow and high isosceles inverted trapezoid with a chamfer transition.

[0008] The cross section of the component concrete is a "T" shape formed by the combination of the upper vertical rectangle with height greater than width and the lower horizontal rectangle with width greater than height with a right angle transition. The lower horizontal rectangle region of the "T" shape is entirely poured with the high strength concrete.

[0009] The cross section of the component concrete is a "I" shape formed by the combination of the upper horizontal rectangle with width greater than height, the middle vertical rectangle with height greater than width and the lower horizontal rectangle with width greater than height with a chamfer transition. The lower horizontal rectangle region of the "I" shape is entirely poured with the high strength concrete.

[0010] The cross section of the component concrete is a "π" shape formed by the combination of the upper horizontal rectangle with width greater than height and the lower two isosceles inverted trapezoids with width greater than height with a circular arc transition.

[0011] The cross section of the component concrete is a groove shape formed by the combination of the upper horizontal rectangle with width greater than height at both ends and the lower two "L" shapes.

[0012] The prestressed steel strand is arranged in the length direction inside the high strength concrete and prestressed by pre-tensioning method. A certain number of prestressed steel strands are also embedded in the upper low strength concrete.

[0013] Compared with the prior art, the prefabricated component of pre-tensioning method prestressed variable strength concrete provided by the utility model has the following advantages:

[0014] 1. The high-strength concrete is used to wrap the prestressed steel strand, the compressive strength of the concrete in the pre-tensioning stage of the prestressed component is improved, so that the prestress of the prefabricated component can be improved, the cross-sectional size and self-weight of the component can be reduced under the same bending moment, and the load-carrying capacity of the component can be improved under the condition of the same cross-sectional size of the component.

[0015] 2. The high-strength concrete is used in the area of the prefabricated component that bears large compressive stress, and the low-strength concrete is used in the area that bears small compressive stress, so that the compressive strength of different strength concretes and the tensile strength of the prestressed steel strand are fully utilized, the material utilization efficiency is improved, and material waste is avoided.

[0016] 3. By adjusting the strength, proportion and distribution of the high-strength concrete and the low-strength concrete, and the shape of the concrete body of the component, the requirements of different application scenarios and load conditions can be met, and the adaptability and flexibility of the component are improved.

[0017] 4. The high-strength concrete has high compressive strength and strong impermeability, and wrapping the prestressed steel strand can improve the crack resistance and durability of the component. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a perspective view of a first tensioning method prestressed variable-strength concrete prefabricated component with a rectangular cross section.

[0019] Figure 2 It is a side view of the first tensioning method prestressed variable-strength concrete prefabricated component in Figure 1

[0020] It is a cross-sectional view of the first tensioning method prestressed variable-strength concrete prefabricated component in Figure 3 Figure 1 It is a perspective view of another first tensioning method prestressed variable-strength concrete prefabricated component with a rectangular cross section.

[0021] Figure 4 It is a side view of the first tensioning method prestressed variable-strength concrete prefabricated component in

[0022] Figure 5 Figure 4 It is a cross-sectional view of the first tensioning method prestressed variable-strength concrete prefabricated component in

[0023] Figure 6 It is a cross-sectional view of a first tensioning method prestressed variable-strength concrete prefabricated component with an inverted trapezoidal cross section. Figure 4

[0024] Figure 7

[0025] Figure 8 ​​​​This is a cross-sectional view of a prestressed variable strength concrete precast component using a T-shaped cross-section.

[0026] Figure 9 This is a cross-sectional view of a prestressed variable strength concrete precast component using the prestressing method with an inverted "T" shaped cross section.

[0027] Figure 10 This is a cross-sectional view of a prestressed variable strength concrete precast component using a type "I" shaped cross section.

[0028] Figure 11 This is a three-dimensional view of a prestressed variable strength concrete precast component using a "π" shaped cross-section.

[0029] Figure 12 for Figure 11 A side view of a prestressed variable strength concrete precast component using the pre-tensioning method.

[0030] Figure 13 for Figure 11 A cross-sectional view of a prestressed variable strength concrete precast component using the pre-tensioning method.

[0031] Figure 14 This is a three-dimensional view of a prestressed variable strength concrete precast component with outward-flaring cross-section on both sides.

[0032] Figure 15 for Figure 14 A side view of a prestressed variable strength concrete precast component using the pre-tensioning method.

[0033] Figure 16 for Figure 14 A cross-sectional view of a prestressed variable strength concrete precast component using the pre-tensioning method.

[0034] in, Figures 1-16 In the middle: 1. Concrete components; 11. High-strength concrete; 12. Low-strength concrete; 2. Steel strands; 3. Reinforcing bars; 31. Stirrups; 32. Web reinforcement; 33. Tie bars; 34. Truss reinforcement; 35. Steel mesh; 36. Other reinforcing bars. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0036] See Figures 1-16The utility model provides a kind of pre-tensioning method prestressed variable strength concrete prefabricated component's embodiment, including component concrete body 1, prestressed steel strand 2 and reinforcing bar 3, the component concrete body 1 includes high-strength concrete body 11 and low-strength concrete body 12, the high-strength concrete body 11 uses the high-strength concrete with 60-200MPa of compressive strength standard value, the high-strength concrete body 11 is wrapped inside the prestressed steel strand 2, the low-strength concrete body 12 uses the low-strength concrete with 30-50MPa of compressive strength standard value, the low-strength concrete body 12 is in the above of the high-strength concrete body 11 or from above and two end surfaces half-enclose the high-strength concrete body 11, reinforcing bar 3 includes stirrup 31, waist muscle 32, tension bar 33, truss muscle 34, reinforcing mesh 35 and other reinforcing steel bars 36, reinforcing bar 3 is arranged in the preset position of component concrete body 1 according to design rule, the concrete of the high-strength concrete body 11 and the low-strength concrete body 12 is combined into an organic whole by layered pouring.The high-strength concrete body 11 of concrete is poured in the cavity of mould first when producing, when the external morphology of the high-strength concrete body 11 is hardened and loses fluidity, the concrete of the low-strength concrete body 12 is poured again, the concrete of the high-strength concrete body 11 and the low-strength concrete body 12 gradually solidifies and combines into an organic whole, can avoid the cold joint between different strength concretes.The component concrete body 1 in the utility model is designed into the combined structure of high-strength concrete body 11 and low-strength concrete body 12, uses two different strength concretes, makes prestressed steel strand 2 and concrete performance fully play, the stress of component in different parts is more reasonable, realizes the optimized configuration of component material strength, avoids material waste, meets the strength requirement, improves the overall performance and performance-price ratio of component.

[0037] Referring to Figures 1-6 The utility model provides the embodiment of pre-tensioning method prestressed variable strength concrete prefabricated component of rectangular cross section, referring to Figure 3 、 Figure 6 The cross section of the component concrete body 1 is vertical rectangle of high greater than wide, referring to Figure 2 、 Figure 5 The low-strength concrete body 12 is in the above of the high-strength concrete body 11, or the low-strength concrete body 12 half-encloses the high-strength concrete body 11 from above and two end surfaces, and the tensile stress of prestressed steel strand 2 in the range of transfer length from prefabricated component end surface after tensioning is gradually increased from zero to effective prestress, and the compressive stress of precompression zone concrete in the range of transfer length is also gradually increased, when the compressive stress of precompression zone concrete in certain distance of end surface is lower than the concrete strength grade of low-strength concrete body 12, half-enclose structure can further optimize the configuration of different strength concretes, improve material utilization, reduce cost.

[0038] Referring to Figure 7The utility model provides an embodiment of the prestressed variable strength concrete prefabricated component of the pre-tensioning method with inverted trapezoidal cross section, the cross section of the component concrete body 1 is inverted trapezoid of upper wide lower narrow, and the slope of both sides of the cross section facilitates the demoulding of the prefabricated component from the integral mould.

[0039] Refer to Figure 8 The utility model provides an embodiment of the prestressed variable strength concrete prefabricated component of the pre-tensioning method with inverted trapezoidal cross section, the cross section of the component concrete body 1 is inverted trapezoid of upper wide lower narrow, and the slope of both sides of the cross section facilitates the demoulding of the prefabricated component from the integral mould.

[0040] Refer to Figure 9 The utility model provides an embodiment of the prestressed variable strength concrete prefabricated component of the pre-tensioning method with inverted trapezoidal cross section, the cross section of the component concrete body 1 is inverted trapezoid of upper wide lower narrow, and the slope of both sides of the cross section facilitates the demoulding of the prefabricated component from the integral mould.

[0041] Refer to Figure 10 The utility model provides an embodiment of the prestressed variable strength concrete prefabricated component of the pre-tensioning method with inverted trapezoidal cross section, the cross section of the component concrete body 1 is inverted trapezoid of upper wide lower narrow, and the slope of both sides of the cross section facilitates the demoulding of the prefabricated component from the integral mould.

[0042] Refer to Figures 11-13The utility model discloses adopt " pi " shape cross section's prestressed variable strength concrete prefabricated component's embodiment of pre-tensioning method, the cross section of the component concrete body 1 is by the horizontal rectangle of upper wide greater than height and two lower isosceles inverted trapezoid of upper wide lower narrow combination with the arc transition of " pi " shape, the beam of the abdomen of wide panel and two inverted trapezoidal cross sections, it is a prestressed concrete bearing component of large span, large coverage area and relatively economic plate beam combination, has good structural mechanics performance.

[0043] Referring to Figures 14-16 The utility model discloses adopt two sides to outward flanging groove shape cross section's prestressed variable strength concrete prefabricated component's embodiment of pre-tensioning method, the cross section of the component concrete body 1 is by the horizontal rectangle of upper wide greater than height and two lower " L " shape combination and become two sides to outward flanging groove shape, the beam of two ends of wide panel and two L shape cross sections, it is a prestressed concrete bearing component of large span, large coverage area and relatively economic plate beam combination, and the beam of L shape cross section has expanded cross section flange on the basis of traditional rectangular beam, increases the area of compression zone when tensioning, can distribute prestressed steel strand 2, improves the bearing capacity under the condition of same beam height.

[0044] Referring to Figures 1-16 In the utility model discloses give above-mentioned pre-tensioning method prestressed variable strength concrete prefabricated component embodiment, the prestressed steel strand 2 is arranged along the length direction in the high-strength concrete body 11 and adopts pre-tensioning method to add prestress, also embeds a certain number of prestressed steel strand 2 in the low-strength concrete body 12 in upper portion, for balancing the excessive arch of prefabricated component when tensioning the lower prestressed steel strand 2, avoid the crack of prefabricated component upper surface.

[0045] In the utility model discloses give above-mentioned pre-tensioning method prestressed variable strength concrete prefabricated component embodiment, and prestressed concrete component can be flexibly selected according to application scene and load demand Different shape prefabricated component, adjust the proportion of high-strength concrete and low-strength concrete, to satisfy different application demand, and this flexibility makes the prestressed concrete component provided by the utility model have more extensive adaptability in practical application.

Claims

1. A pre-tensioned prestressed variable-strength concrete precast member comprising a member concrete body (1), a prestressed steel strand (2) and a steel bar (3), characterized in that The component concrete body (1) comprises a high-strength concrete body (11) and a low-strength concrete body (12), the high-strength concrete body (11) is made of high-strength concrete with a standard compressive strength of 60-200 MPa, the high-strength concrete body (11) wraps the prestressed steel strand (2) inside, the low-strength concrete body (12) is made of low-strength concrete with a standard compressive strength of 30-50 MPa, the low-strength concrete body (12) semi-surrounds the high-strength concrete body (11) from above or from above and both end faces, and the concrete of the high-strength concrete body (11) and the low-strength concrete body (12) is integrally combined by layer pouring.

2. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is a vertical rectangle with height greater than width.

3. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is an isosceles inverted trapezoid with width greater than height from top to bottom.

4. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is a "T" shape combined by an isosceles inverted trapezoid with wide and flat top and an isosceles inverted trapezoid with narrow and high bottom with chamfered transition.

5. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is an inverted "T" shape combined by a vertical rectangle with height greater than width and a horizontal rectangle with width greater than height with right-angled transition, and the high-strength concrete is poured in the horizontal rectangle area of the inverted "T" shape.

6. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is a "I" shape combined by a horizontal rectangle with width greater than height, a vertical rectangle with height greater than width, and a horizontal rectangle with width greater than height with chamfered transition, and the high-strength concrete is poured in the horizontal rectangle area of the "I" shape.

7. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is a "π" shape combined by a horizontal rectangle with width greater than height and two isosceles inverted trapezoids with wide top and narrow bottom with circular arc transition.

8. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The cross section of the component concrete body (1) is a groove shape combined by a horizontal rectangle with width greater than height and two "L" shapes at both ends.

9. A precast pre-tensioned prestressed variable strength concrete member as claimed in claim 1, wherein The prestressed steel strand (2) is arranged in the length direction inside the high-strength concrete body (11) and prestressed by pretensioning method, and a certain number of prestressed steel strands (2) are also embedded in the low-strength concrete body (12) at the top.

Images