Prestressed structure and prestressed building

Abstract

The invention discloses a prestressed structure and a prestressed building, and relates to the technical field of constructional engineering. The invention aims to solve the problems that when a traditional prestressed structure is applied between a core tube and an outer frame beam, differential deformation occurs, additional internal force superposition generated by tensioning force of a prestressed rib can increase the tensile stress of the bottom of a floor slab connected with the outer frame beam and the torque of the outer frame beam, and the bearing capacity of the prestressed structure is reduced. The prestressed structure comprises a prestressed structure main body and prestressed tendons. The prestressed structure body is provided with a first end and a second end which are oppositely arranged. The prestressed tendon is arranged in the prestressed structure body and comprises a first straight line section, a first curve section, a second curve section and a second straight line section which are sequentially connected. At least the first linear segment is fixedly connected with the prestressed structure body close to the first end, and at least the second linear segment is fixedly connected with the prestressed structure body close to the second end. The prestressed structure provided by the invention is used for prestressed buildings.

Description

Technical Field

[0001] The present invention relates to the technical field of building engineering, and in particular to a prestressed structure and a prestressed building. Background Art

[0002] Prestressed structures are one of the commonly used structures in construction projects, such as beams and floor slabs. Through the pre-applied pressure, the prestressed stress of the building structure during use can fully or partially offset the tensile stress caused by the load, thereby preventing the building structure from cracking and damage under its own gravity and / or load.

[0003] Between the core tube and the outer frame beam arranged around the core tube, the core tube and the outer frame beam can be connected by a connecting structure such as a floor slab or a connecting beam. Taking the floor slab between the core tube and the outer frame beam as an example, under the action of the tensioning force of the prestressed tendons, the traditional prestressed structure makes the bottom of the floor slab at both ends of the floor slab pre-tensioned, and the bottom of the middle part of the floor slab pre-compressed.

[0004] When the outer frame beam has a large span, the vertical deformation of the mid-span part of the outer frame beam in the up and down direction is large, and the vertical deformation of the corresponding core tube side is small. That is, under gravity load, the floor slab connected to the mid-span part of the outer frame beam is pulled at the bottom of the slab in the vertical beam span direction.

[0005] Under the combined effect of gravity load and prestressed tendon tension, the floor slab of the traditional prestressed structure has a large tensile stress at the bottom near the outer frame beam, which causes the outer frame beam to have a large torque, thereby reducing the torsional resistance of the outer frame beam and the tensile bearing capacity of the bottom of the floor slab. Summary of the invention

[0006] The purpose of the present invention is to provide a prestressed structure and a prestressed building, aiming to solve the problem that when a traditional prestressed structure is applied between a core tube and an outer frame beam, the superposition of additional internal forces generated by differential deformation and prestressed reinforcement tension will increase the tensile stress at the bottom of the floor slab connected to the outer frame beam and the torque on the outer frame beam, thereby reducing the bearing capacity of the prestressed structure.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme:

[0008] On the one hand, the present invention provides a prestressed structure, including a prestressed structure body and prestressed tendons. The prestressed structure body extends along a first direction and has a first end and a second end arranged opposite to each other. The prestressed tendons are arranged in the prestressed structure body from the first end to the second end. From the first end to the second end, the prestressed tendons include a first straight segment, a first curved segment, a second curved segment and a second straight segment connected in sequence. At least the first straight segment is fixedly connected to the prestressed structure body near the first end, and at least the second straight segment is fixedly connected to the prestressed structure body near the second end. The prestressed tendons are in a tensioned state so that the prestressed structure body generates prestress at the first end and the second end.

[0009] By setting prestressed tendons in a tensioned state, a pre-compressive force can be applied to the second end of the prestressed structural body to offset or reduce the tensile stress at the bottom of the slab caused by the external load, so that the prestressed structural body can stably bear the external load of the prestressed building under normal use, so as to avoid the prestressed structural body from being cracked or damaged due to tension, thereby improving the bearing capacity of the prestressed structure.

[0010] In some embodiments, the length of the first straight segment and the corresponding length of the prestressed structural body from the first end to the second end are adjustable.

[0011] In some embodiments, the length of the second straight segment and the corresponding length of the prestressed structural body from the first end to the second end are adjustable.

[0012] In some embodiments, the center of the inscribed circle of the second curved segment and the center of the inscribed circle of the first curved segment are located at the upper and lower sides of the prestressed tendon; and there is a height difference between the first straight line segment and the second straight line segment.

[0013] In some embodiments, the first straight line segment is smoothly connected to the first curved line segment.

[0014] In some embodiments, the first curved segment is smoothly connected to the second curved segment.

[0015] In some embodiments, the second curved segment is smoothly connected to the second straight segment.

[0016] In some embodiments, the first straight line segment is disposed parallel to the second straight line segment.

[0017] In some embodiments, the prestressed structure is a pre-tensioned prestressed structure.

[0018] In some embodiments, the prestressed structure is a post-tensioned structure.

[0019] In some embodiments, the prestressed structure includes a prestressed tendon hole. The prestressed structure body is provided with a prestressed tendon hole from the first end to the second end, the prestressed tendon hole is a through-hole structure, and the prestressed tendon is located in the prestressed tendon hole and tensioned between the first end and the second end.

[0020] On the other hand, the present invention also provides a prestressed building, comprising a supporting body and the prestressed structure of the previous aspect, wherein the first end and the second end of the prestressed structure body are fixedly connected to the supporting body so that the prestressed structure body generates prestress at the first end and the second end.

[0021] Since the prestressed building includes the prestressed structure in the above aspect, the prestressed building has all the beneficial effects of the above prestressed structure, which will not be described in detail here.

[0022] In some embodiments, the supporting body includes at least one of a core tube, an internal beam, a supporting column, and a shear wall.

[0023] In some embodiments, at least one of the floor slab and the interior beams is a prestressed structure.

[0024] In some embodiments, the supporting body includes a main body, an outer frame beam and a floor slab. The main body includes at least one of a core tube, an internal beam, a column and a shear wall. The outer frame beam is arranged around at least part of the main body, and the outer frame beam is connected to the main body at least through the floor slab. Wherein, at least part of the floor slab is a prestressed structure, and the first end of the prestressed structure body is connected to the main body, and the second end of the prestressed structure body is connected to the outer frame beam. The upper side of the first end of the prestressed structure body is prestressed, and the lower side of the second end of the prestressed structure body is prestressed.

[0025] In some embodiments, the prestressed building further comprises a plurality of peripheral support structures, which are spaced and connected to the outer frame beam along the extension direction of the outer frame beam, and are used to support the outer frame beam. Wherein, along the extension direction of the outer frame beam, the span of the outer frame beam is the extension length of the outer frame beam between two adjacent peripheral support structures. The connection area between the outer frame beam and the main body of the prestressed structure occupies 1 / 4 to 1 / 3 of the span of the outer frame beam, and the connection area between the outer frame beam and the main body of the prestressed structure is arranged close to the mid-span of the outer frame beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1A plan view of a prestressed building provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the bending moment distribution of a prestressed structure of a related technology;

[0029] Figure 3 A schematic diagram of a prestressed application structure between a core tube and an outer frame beam in a related technical solution;

[0030] Figure 4 A bending moment distribution diagram of a prestressed structure between the core tube and the outer frame beam in an embodiment of the present application;

[0031] Figure 5 A side view of a prestressed structure provided in an embodiment of the present application;

[0032] Figure 6 for Figure 5 A schematic diagram of a connection structure when the prestressed structure shown is a floor slab;

[0033] Figure 7 for Figure 3 The prestressed structure shown in FIG. 1 includes a structural schematic diagram of a tensioning channel.

[0034] Reference numerals:

[0035] 100-prestressed buildings;

[0036] 10-supporting body; 11-core tube; 12-internal beam;

[0037] 20-external frame beam;

[0038] 30- Floor;

[0039] 40- peripheral support structure;

[0040] 50-prestressed structure; 51-prestressed structure body; 511-first end; 512-second end; 52-prestressed tendon; 521-first straight segment; 522-first curved segment; 523-second curved segment; 524-second straight segment; 53-prestressed tendon channel. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or relative positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition of satisfying the relative positional relationship shown in the drawings.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" should be understood in a broad sense, such as fixed connection, detachable connection, and integral connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the electrical connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0046] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0047] The present application provides a prestressed building, such as Figure 1As shown, the prestressed building 100 can support a main body, and the supporting main body can include a main body 10, an outer frame beam 20 and a floor 30. The outer frame beam 20 is arranged around at least a part of the main body 10, and the outer frame beam 20 is connected to the main body 10 at least through the floor 30.

[0048] Through the support of the main part 10 and the outer frame beam 20, multiple floor slabs 30 can be arranged at intervals in the vertical direction, that is, the interval space between two adjacent floor slabs 30 in the vertical direction is the internal building space of the prestressed building 100, which is beneficial to improving the volume ratio of the prestressed building 100.

[0049] It should be noted that the prestressed building 100 provided in the embodiment of the present application may be a reinforced concrete building with a core tube structure as the main body and a shear wall structure and / or a frame structure connected to the periphery. Alternatively, the prestressed building 100 may also be a reinforced concrete building including at least one of a shear wall structure and a frame structure. In addition, the prestressed building 100 may also be a steel structure, a steel-concrete structure, or a brick-concrete structure, etc., which is not limited thereto.

[0050] Taking prestressed building 100 as Figure 1 Taking the core tube structure shown as an example, the main body 10 may include a core tube 11. The supporting body may also include an internal beam 12. The number of core tubes 11 may be one, that is, the core tube 11 located inside the outer frame beam 20 may be connected to the outer frame beam 20 through a floor slab 30. Alternatively, the number of core tubes 11 may also be multiple, and multiple core tubes 11 may be spaced and connected through an internal beam 12 to form an integral structure, and the outer frame beam 20 may also be connected to one or more inner core tubes 11 through multiple floor slabs 30.

[0051] In some other embodiments, the supporting body may further include a shear wall, and the core tube 11 and the outer frame beam 20 are connected by the shear wall structure. Alternatively, when there is a large span between the core tube 11 and the outer frame beam 20, one or more supporting columns are arranged below the inner beam 12, and a shear wall structure may also be arranged at least partially below the inner beam 12 to improve the supporting effect of the inner beam 12 on the outer frame beam 20.

[0052] In some embodiments, continue to refer to Figure 1 The prestressed building 100 may further include a plurality of peripheral support structures 40, which may be spaced apart around the core tube 11. For example, along the extension direction of the outer frame beam 20, the plurality of peripheral support structures 40 are spaced apart and connected to the outer frame beam 20 to support the outer frame beam 20 to bear the vertical load at the outer frame beam 20.

[0053] At this time, along the extension direction of the outer frame beam 20 , the span of the outer frame beam 20 can be defined as the extension length of the outer frame beam 20 between two adjacent peripheral supporting structures 40 .

[0054] Exemplarily, the peripheral support structure 40 may be columns distributed around the core tube 11. Alternatively, the peripheral support structure 40 may be a shear wall, which only needs to be able to stably support the outer frame beam 20.

[0055] In some other embodiments, the outer frame beam 20 may be set as a suspended structure. In this case, the vertical load at the outer frame beam 20 can be reduced, and the supporting strength of the main body 10 to the outer frame beam 20 can be further enhanced, so that the prestressed building 100 meets the design load requirements.

[0056] At this time, take the example of the outer frame beam 20 connecting the core tube 11 through the inner beam 12 and / or the shear wall. Along the extension direction of the outer frame beam 20, the extension length of the outer frame beam 20 between adjacent inner beams 12 and / or shear walls can also be regarded as the span of the outer frame beam 20.

[0057] It should be noted that, in the case where the prestressed building 100 includes a peripheral support structure 40, the core tube 11 and the outer frame beam 20 are connected by the internal beam 12, and the peripheral support structure 40 is a column. In a single-story prestressed building 100, multiple columns can be arranged in a one-to-one correspondence with multiple internal beams 12, such as a column can be connected to the same position of the outer frame beam 20 at an end of an internal beam 12 away from the core tube 11. That is, the span of the outer frame beam 20 at this time is also equivalent to the extension length of the outer frame beam 20 between two adjacent peripheral support structures 40.

[0058] For example, the outer frame beam 20 is connected to the core tube 11 through the floor 30 and the internal beam 12 and other connecting structures. Figure 2 As shown, Figure 2 Schematic diagram of the bending moment distribution of a prestressed structure of a related technology. Figure 2 The x-axis in the figure represents the extension length of the connection structure from the core tube 11 to the outer frame beam 20, and the y-axis represents the different bending moment distributions of the connection structure at different length positions. If the bending moment is above the x-axis, it means that the bottom of the connection structure at this position is under compression, and if the bending moment is below the x-axis, it means that the bottom of the connection structure at this position is under tension.

[0059] Combination Figure 2 , if a conventional prestressed tensioning bar A is provided in the connecting structure (such as a floor slab or an inner beam) connecting the core tube 11 and the outer frame beam 20. Figure 3As shown, prestressed tensioning bars A can be arranged in the floor slab 30 between the core tube 11 and the outer frame beam 20 so that the prestressed tensioning bars A exert a preset force on the floor slab 30 such that the bottom of the slab in the middle area is compressed and the bottom of the slab in the two end areas is tensile.

[0060] It should be noted that for building structures, reinforced concrete is usually used as the main structure. Since reinforced concrete has a large compressive strength but poor tensile strength, the provision of prestressed tensioning bars is conducive to improving the stress conditions of reinforced concrete structures. For example, before the structure bears the load, prestressed tensioning bars are used to apply pressure to the structure in advance, so that the internal force of the concrete in the tensile zone under the action of external loads produces compressive stress, which is used to offset or reduce the tensile stress generated by the external load, so that the structure does not produce cracks or reduces the width of the cracks under normal use.

[0061] The prestressed structure provided by the present application is not only applicable to building structures such as reinforced concrete, but also applicable to steel structures or other building structures, without limitation.

[0062] Since the load gravity of the floor slab 30 acts on the floor slab 30 in a tensile manner at the bottom of the middle area and in a compressive manner at the bottom of the two end areas, that is, under the combined effect of the preset force of the prestressed tensioning bars A on the floor slab 30 and the load gravity of the floor slab 30, the overall bending moment of the floor slab 30 can be made smaller, and it is not easy to crack, deform or damage.

[0063] However, when the outer frame beam 20 has a large span, the vertical deformation of the mid-span portion of the outer frame beam 20 in the up-down direction is large, while the vertical deformation on the side of the core tube 11 is small or even negligible. Based on this, the vertical deformation of the mid-span portion of the outer frame beam 20 will generate additional bending moment on the connected floor slab 30, causing the bottom of the slab connected to the outer frame beam to be tensile, and the top of the slab connected to the core tube to be tensile.

[0064] In this way, under the combined effect of gravity load and the tensioning force of prestressed tensioning bars A, the tensile stress at the bottom of the floor slab 30 of the traditional prestressed structure is further increased near the outer frame beam 20, and causes the outer frame beam 20 to have a larger torque, thereby reducing the torsional resistance of the outer frame beam 20 and the tensile bearing capacity of the bottom of the floor slab 30.

[0065] That is to say, combined Figure 1 In the mid-span area of ​​the outer frame beam 20, especially in the 1 / 4 to 1 / 3 area near the mid-span of the outer frame beam 20, the floor slab 30 has a large compressive stress at its bottom near the main part 10. Figure 4 The bottom of this part of the floor slab 30 from the main part 10 to the outer frame beam 20 is first compressed and then tensile.

[0066] Based on this, Figure 5As shown, the prestressed building 100 may include a prestressed structure 50, which may include a prestressed structure body 51 and prestressed tendons 52. The prestressed structure body 51 is extended along a first direction and has a first end 511 and a second end 512 that are oppositely arranged. The first end and the second end of the prestressed structure body 51 are fixedly connected to the supporting body, so that the prestressed structure body 51 generates prestress at the first end and the second end.

[0067] The prestressed tendons 52 can be arranged in the prestressed structural body 51 from the first end 511 to the second end 512. From the first end 511 to the second end 512, the prestressed tendons 52 include a first straight segment 521, a first curved segment 522, a second curved segment 523 and a second straight segment 524 arranged in sequence. At least the first straight segment 521 is fixedly connected to the prestressed structural body 51 near the first end 511, and at least the second straight segment 524 is fixedly connected to the prestressed structural body 51 near the second end 512. At this time, the prestressed tendons 52 in the prestressed structural body 51 are in a tensioned state, so that the prestressed structural body 51 generates prestress at the first end 511 and the second end 512. Among them, the prestressed structural body 51 can generate different types of forces at the first end 511 and the second end 512. Exemplarily, the lower side of the prestressed structural body 51 at the first end 511 is pre-tensioned, and the lower side of the prestressed structural body 51 at the second end 512 is pre-compressed.

[0068] By setting the prestressed tendons 52 in a tensioned state, a pre-compressive force can be applied to the second end 512 of the prestressed structural body 51 to offset or reduce the tensile stress at the bottom of the slab caused by the external load, so that the prestressed structural body 51 can stably bear the external load of the prestressed building 100 under normal use, so as to avoid the prestressed structural body 51 from being cracked or damaged due to tension, thereby improving the bearing capacity of the prestressed structure 50.

[0069] In some embodiments, Figure 5 and Figure 6 As shown, at least part of the floor slab 30 connected between the core tube 11 and the outer frame beam 20 can be set as the above-mentioned prestressed structure 50. At this time, the first end 511 of the prestressed structure body 51 can be fixedly connected to the core tube 11, and the second end 512 of the prestressed structure body 51 can be fixedly connected to the outer frame beam 20. That is, the end of the prestressed structure body 51 close to the outer frame beam 20 is prestressed at the bottom of the prestressed structure body 51 (such as the floor slab 30) under the action of the prestressed tendons 52.

[0070] In this way, by setting the floor slab 30 with the above-mentioned prestressed structure as the main body, at the second end 512 of the floor slab 30 close to the connecting beam 20, the prestressed tendons 52 make the floor slab 30 pre-stressed at the bottom of one end close to the outer frame beam 20. In this way, even if the mid-span portion of the outer frame beam 20 is deformed due to vertical settlement, the floor slab 30 is subjected to tension at the bottom of the slab near this position. However, since the floor slab 30 is pre-stressed at this location by the prestressed tendons 52, the tension at the bottom of the slab caused by the external load (such as the connecting beam 20) can be offset or reduced, so that the floor slab 30 can stably bear the tension of the connecting beam 20, especially the mid-span portion, under normal use, so as to avoid the floor slab 30 from being cracked or damaged due to tension.

[0071] For example, Figure 1 and Figure 6 Taking the prestressed building 100 shown in the figure as an example, through the application of the above scheme, around the core tube 11, the axial force of the floor slab 30 of the prestressed structure is expressed as pressure, and the maximum axial pressure per unit width is 900-1200 kN / m, and the maximum compressive stress is 3-4 MPa, which is much smaller than the compressive design strength of concrete C35. Based on this, through the arrangement of the floor slab 30 of the prestressed structure, a better supporting effect can be achieved for the outer frame beam 20 outside the core tube 11, which is conducive to reducing the vertical displacement deformation of the outer frame beam 20 (especially the mid-span part).

[0072] Through the action of the prestressed tendons 52, the floor slab 30 (i.e., the prestressed structural body 51) generates an anti-arch, the mid-span slab surface is pulled, and the bottom of the slab at the support of the core tube 11 is pulled, thereby reducing the bending moment of the floor slab 30 under gravity load.

[0073] Through statistical measurements, we know that Figure 1 In the prestressed building 100 shown, by setting at least part of the floor slab 30 as a prestressed structure 50, the vertical displacement deformation at the outer frame beam 20 can be reduced by 5% to 20%, and the bending moment of the floor slab 30 can be reduced by 30% to 45%. The effect is significant and the structure is simple.

[0074] In actual application, part of the floor slab 30 of the prestressed building 100 can be set as the prestressed structure 50. One or more of the internal beams 12 and the shear wall structure can also be set as the prestressed structure 50, which is beneficial to improve the overall stability of the prestressed building 100.

[0075] It should be noted that in the prestressed building 100, the first end 511 of the prestressed structure main body 51 of the prestressed structure 50 can be fixedly connected to the main parts 10 such as the core tube 11, the internal beam 12, the column and the shear wall. The upper side of the first end of the prestressed structure main body 51 can be pre-stressed. The second end 512 of the prestressed structure main body 51 can be suspended, that is, a cantilever structure. Alternatively, other building structures (such as an outer frame beam 20) can be fixedly connected to the second end of the prestressed structure main body 51, so that the prestressed structure 50 such as the floor slab 30 or the internal beam 12 can share the load gravity of the building structure. The lower side of the second end 512 of the prestressed structure main body 51 can be pre-stressed.

[0076] For the outer frame beam 20, due to the effect of load gravity, along the span direction, the closer the outer frame beam 20 is to the mid-span, the greater the vertical deformation amplitude (or displacement) will be.

[0077] Based on this, for the prestressed tendon 52 structure in the floor slab 30, along the extension direction of the outer frame beam 20, one or more prestressed tendons 52 can be arranged in the floor slab 30 corresponding to the mid-span area of ​​the outer frame beam 20, that is, this part of the floor slab 30 can be set as a prestressed structure 50 to share the load gravity of the outer frame beam 20, thereby reducing the degree of vertical deformation of the mid-span part of the outer frame beam 20.

[0078] In some embodiments, the connection area between the outer frame beam 20 and the prestressed structure body 51 occupies 1 / 4 to 1 / 3 of the span of the outer frame beam 20. Along the extension direction of the outer frame beam 20, the connection area between the outer frame beam 20 and the prestressed structure body 51 can be arranged close to the mid-span of the outer frame beam 20.

[0079] In this way, while effectively preventing the vertical settlement and deformation of the outer frame beam 20 , by setting a part of the floor slab 30 as a prestressed structure 50 , it is helpful to simplify the structure of the floor slab 30 .

[0080] For example, along the extension direction of the corresponding outer frame beam 20, the part of the floor slab 30 near the middle area is provided with prestressed tendons 52, that is, a prestressed structure 50. Both sides of the prestressed structure 50 are conventional floor slabs 30, that is, the simplified floor slab 30 structure can improve the construction speed of the prestressed building 100, simplify the construction difficulty, reduce the construction cost, and improve the overall stability of the prestressed building 100.

[0081] In some embodiments, Figure 5 and Figure 6 As shown, from the first end 511 to the second end 512, the length of the first straight segment 521 and the corresponding length of the prestressed structural body 51 are adjustable. And / or, from the first end 511 to the second end 512, the length of the second straight segment 524 and the corresponding length of the prestressed structural body 51 are adjustable.

[0082] In this way, the length of the prestressed structure body 51 can be flexibly adjusted from the first end 511 to the second end 512, so that the prestressed structure 50 can adapt to different spans and different structural ranges.

[0083] Exemplarily, when the prestressed tendons 52 are arranged in the prestressed structural body 51, the first curved segment 522 and the second curved segment 523 can be arranged close to the first end 511 or close to the second end 512 by adjusting the length of the first straight segment 521 and the second straight segment 524 and the corresponding prestressed structural body 51.

[0084] For example, the first end 511 of the prestressed structure body 51 is fixedly connected to the core tube 11, and the second end 512 of the prestressed structure body 51 is fixedly connected to the outer frame beam 20. The tensile stress acting on the prestressed structure body 51 through the vertical deformation of the outer frame beam 20 will cause the prestressed structure body 51 (floor 30) to crack and damage at a position close to the core tube 11. In this way, when arranging the prestressed tendons 52, by reducing the length of the first straight segment 521 and increasing the length of the second straight segment 524, the first curved segment 522 and the second curved segment 523 are arranged close to the first end 521. At this time, the center of the inscribed circle of the first curved segment 522 can be located below the first straight segment 521, and the inscribed circle of the second curved segment 523 can be located above the second straight segment 524, so that there is a height difference between the first straight segment 521 and the second straight segment 524, which can solve the problem of cracking and damage in this part of the prestressed structure body 51 when it is tensile.

[0085] Exemplarily, the first straight segment 521 is smoothly connected to the first curved segment 522. The first curved segment 522 is smoothly connected to the second curved segment 523. The second curved segment 523 is smoothly connected to the second straight segment 524, so that the preset force between the prestressed tendons 52 and the prestressed structural body 51 is smoothly transitioned.

[0086] In some embodiments, the first straight line segment 521 and the second straight line segment 524 are arranged in parallel or approximately in parallel, so as to facilitate the fixed installation of the prestressed tendon 52 at the second end 512 .

[0087] Taking the prestressed structural body 51 as a reinforced concrete member as an example, the methods of arranging the prestressed tendons 52 in the prestressed structural body 51 include pre-tensioning and post-tensioning. By applying pre-compression stress to the tension zone of the reinforced concrete member, the elastic contraction force of the prestressed steel bar is transferred to the reinforced concrete member through the bonding force or anchor between the prestressed tendons 52 and the reinforced concrete member, and pre-compression stress is generated.

[0088] The pre-tensioning method is to tension the prestressed tendons 52 before pouring the reinforced concrete component, and temporarily fix the tensioned prestressed tendons 52 on a pedestal or steel formwork, and then pour the concrete. When the concrete reaches a certain strength (generally not less than 75% of the design strength grade) to ensure that the prestressed tendons and concrete have sufficient bonding strength, the prestressed tendons are relaxed, and the reinforced concrete component is generated with pre-compression stress by virtue of the bonding between the concrete and the prestressed tendons.

[0089] The post-tensioning method is a method of first casting reinforced concrete components and then tensioning the prestressed tendons 52. When manufacturing components or blocks, a channel is reserved in advance at the location where the prestressed tendons 52 are placed. After the concrete reaches the strength specified in the design, the prestressed tendons 52 are inserted into the reserved channel. After the prestressed tendons 52 are tensioned to the control stress specified in the design by a tensioning machine, the prestressed tendons 52 are anchored at the end of the component with the help of anchors, and finally the channel is grouted.

[0090] In some embodiments, the prestressed tendons 52 in a tensioned state to apply a preset compressive stress to the prestressed structural body 51 include an unbonded prestressed structure and a bonded prestressed structure.

[0091] Exemplarily, the unbonded prestressed structure is suitable for post-tensioning. A hole is preset in the prestressed structure body 51 so that the prestressed tendons 52 pass through the hole and are anchored at the first end 511 and the second end 512 of the prestressed structure body 51. That is, the prestressed tendons 52 in the hole are directly in contact with the prestressed structure body 51, but not bonded. It is only necessary to anchor the two ends of the prestressed tendons 52 to the prestressed structure body 51, which has the characteristic of convenient construction.

[0092] In the bonded prestressed structure, the prestressed tendons 52 located in the prestressed structure main body 51 are completely bonded and fixed to the prestressed structure main body 51, and have good mechanical properties. During construction, the prestressed tendons 52 can be pre-tensioned and formed by direct casting. Alternatively, a hole can be reserved when making the component, and after the tensioned prestressed tendons 52 are inserted, cement-based materials or epoxy-based materials are poured into the hole to bond the prestressed tendons 52 to the component. Subsequently, the tensioning anchoring structures at both ends of the prestressed tendons 52 can be removed so that the prestressed tendons 52 can apply a preset compressive stress to the prestressed structure main body 51.

[0093] That is, the prestressed structure 50 provided in the embodiment of the present application can be a prestressed structure. Alternatively, the prestressed tendons 52 can also be a post-stressed prestressed structure. Among them, the prestressed tendons 52 can also be set as a post-stressed slow-bonding prestressed structure. The prestressed tendons 52 can also be set as a post-stressed non-bonded prestressed structure. There is no limitation on this.

[0094] In some embodiments, Figure 7As shown, the prestressed structure 50 also includes a prestressed tendon channel 53 and an adhesive layer (not shown in the figure). The prestressed structure main body 51 is provided with a prestressed tendon channel 53 from the first end 511 to the second end 512. The prestressed tendon channel 53 is a through-hole structure, and the prestressed tendon 52 is located in the prestressed tendon channel 53 and is arranged between the first end 511 and the second end 512. After the prestressed tendon channel 53 is positioned so that the prestressed tendon 52 is tensioned and arranged between the first end 511 and the second end 512, the prestressed tendon channel 53 can be filled with an adhesive layer material such as a cement-based material or an epoxy-based material. After the adhesive layer is cured, the cured adhesive layer can fix the prestressed tendon 52 and the prestressed structure main body 51, so that the prestressed tendon 52 is combined with the concrete structure as a whole, improve its integrity and cooperative working ability, avoid the prestress loss caused by the relative slip of the prestressed tendon 52 and the concrete structure due to the loosening of the end anchor, and reduce the bearing capacity of the prestressed structure.

[0095] The installation process of the prestressed tendons 52 is a bonding process, that is, the prestressed tendons 52 and the prestressed structure body 51 are fixedly connected in the prestressed tendon channel 53 by setting an adhesive layer.

[0096] Alternatively, the two ends of the prestressed tendon 52 may be anchored to the first end 511 and the second end 512 of the prestressed structure body 51 through supports, and there is no need to inject bonding material into the prestressed tendon channel 53. That is, the prestressed tendon 52 is installed by a non-bonding process.

[0097] In some other embodiments, the prestressed tendons 52 can also be set as a post-tensioned slow-bonding prestressed structure. That is, the prestressed tendons 52 have the characteristics of both bonded and unbonded prestressed tendons, and a slow-bonding material is wrapped around the steel strands of the prestressed tendons 52. There is no bonding force between the prestressed tendons 52 and the slow-bonding material in the early stage, which is the same as the unbonded system. The slow-bonding material is solidified in the later stage to achieve the characteristics of high concrete strength utilization and greater corrosion resistance as the bonded system. The slow-bonding material can be a slow-setting mortar or epoxy resin, the former is a cement-based material, and the latter is an epoxy-based material. The force performance of the epoxy resin material is similar to that of the bonded structure, and the consolidation time of the epoxy resin material is adjustable or relatively long, which is convenient for factory production and wide use in actual engineering.

[0098] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0099] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A prestressed structure, characterized in that: include; A prestressed structural body, the prestressed structural body extending along a first direction and having a first end and a second end arranged oppositely; and a prestressed tendon, wherein the prestressed tendon is arranged in the prestressed structural body from the first end to the second end; from the first end to the second end, the prestressed tendon comprises a first straight segment, a first curved segment, a second curved segment and a second straight segment connected in sequence; At least the first straight line segment is fixedly connected to the prestressed structure body near the first end, and at least the second straight line segment is fixedly connected to the prestressed structure body near the second end; The prestressed tendons are in a tensioned state so that the prestressed structural body generates prestress at the first end and the second end.

2. The prestressed structure according to claim 1, characterized in that: From the first end to the second end, the length of the first straight line segment and the corresponding length of the prestressed structural body are adjustable; and / or, From the first end to the second end, the length of the second straight line segment and the corresponding length of the prestressed structural body are adjustable.

3. The prestressed structure according to claim 1, characterized in that: The center of the inscribed circle of the second curved segment and the center of the inscribed circle of the first curved segment are located at the upper and lower sides of the prestressed tendon; there is a height difference between the first straight segment and the second straight segment; The first straight line segment is smoothly connected to the first curved line segment; and / or, The first curve segment is smoothly connected to the second curve segment; and / or, The second curved segment is smoothly connected to the second straight line segment.

4. The prestressed structure according to claim 1, characterized in that: The first straight line segment is arranged in parallel with the second straight line segment.

5. The prestressed structure according to any one of claims 1 to 4, characterized in that: The prestressed structure is a post-tensioned prestressed structure; or, The prestressed structure is a pre-tensioned prestressed structure.

6. The prestressed structure according to any one of claims 1 to 4, characterized in that: The prestressed structure comprises: Prestressed tendon channel, the prestressed structural body is provided with the prestressed tendon channel from the first end to the second end, the prestressed tendon channel is a through-hole structure, and the prestressed tendon is located in the prestressed tendon channel and is tensioned between the first end and the second end.

7. A prestressed building, characterized in that: include: Supporting body; And the prestressed structure according to any one of claims 1 to 6, wherein the first end and the second end of the prestressed structure body are fixedly connected to the supporting body so that the prestressed structure body generates prestress at the first end and the second end.

8. The prestressed building according to claim 7, characterized in that: The supporting body includes at least one of a core tube, an internal beam, a column and a shear wall; and / or, At least one of the floor slab and the beam is the prestressed structure.

9. The prestressed building according to claim 7, characterized in that: The supporting body comprises: A main body portion, the main body portion comprising at least one of a core tube, internal beams, columns and shear walls; an outer frame beam, the outer frame beam being disposed around at least a portion of the main body portion; and a floor slab, wherein the outer frame beam is connected to the main body at least through the floor slab; Among them, at least part of the floor slab is the prestressed structure, and the first end of the prestressed structure body is connected to the main part, the second end of the prestressed structure body is connected to the outer frame beam, the upper side of the first end of the prestressed structure body is pre-pressed, and the lower side of the second end of the prestressed structure body is pre-pressed.

10. The prestressed building according to claim 9, characterized in that: The prestressed building also includes: A plurality of peripheral support structures are spaced apart and connected to the outer frame beam along the extension direction of the outer frame beam, and are used to support the outer frame beam; Among them, along the extension direction of the outer frame beam, the span of the outer frame beam is the extension length of the outer frame beam between two adjacent peripheral supporting structures; the connection area between the outer frame beam and the prestressed structure body occupies 1 / 4 to 1 / 3 of the span of the outer frame beam, and the connection area between the outer frame beam and the prestressed structure body is arranged close to the mid-span of the outer frame beam.

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