Prestressed structure and prestressed building

Abstract

The utility model discloses a prestressed structure and a prestressed building, and relates to the technical field of constructional engineering. The utility model 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 extends in the first direction and is provided with a first end and a second end which are oppositely arranged. The prestressed tendon is arranged in the prestressed structure body from the first end to the second end 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 is used for the prestressed building.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building engineering, and particularly relates to a prestressed structure and a prestressed building. BACKGROUND

[0002] The prestressed structure is one of common structures in building engineering, such as beam and floor slab and other building structures. Through the pre-applied pressure, the pre-stress of the building structure during use can be fully or partially offset by the tensile stress caused by the load, so as to avoid the cracking and damage of the building structure under the action of 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 through 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, the traditional prestressed structure is arranged to be pre-tensioned at the bottom of the floor slab at both ends under the action of the prestressed tendon tension, and the middle part of the floor slab is pre-compressed at the bottom.

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

[0005] Under the superimposed action of the gravity load and the prestressed tendon tension, the bottom of the floor slab of the traditional prestressed structure has a large tensile stress near the outer frame beam, and the outer frame beam has a large torsional moment, thereby reducing the torsional resistance of the outer frame beam and the tensile bearing capacity of the bottom of the floor slab. CONTENT OF THE UTILITY MODEL

[0006] The present application aims to provide a prestressed structure and a prestressed building, and aims to solve the problem that when the traditional prestressed structure is applied between the core tube and the outer frame beam, the additional internal force generated by the differential deformation and the prestressed tendon tension will increase the tensile stress of the bottom of the floor slab connected with the outer frame beam and the torsional moment of the outer frame beam, thereby reducing the bearing capacity of the prestressed structure.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] On one hand, this application provides a prestressed structure, including a prestressed structure body and prestressing tendons. The prestressed structure body extends along a first direction and has a first end and a second end disposed opposite to each other. The prestressing tendons are disposed within the prestressed structure body from the first end to the second end. From the first end to the second end, the prestressing 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 prestressing 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-compression force can be applied to the second end of the prestressed structure to offset or reduce the tensile stress at the bottom of the slab caused by external loads. This allows the prestressed structure to stably bear the external loads of the prestressed building under normal use, thus preventing the prestressed structure from cracking or being damaged by tension, thereby improving the bearing capacity of the prestressed structure.

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

[0011] In some implementations, the length of the second straight segment from the first end to the second end and the length of the corresponding prestressed structural body 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 on the upper and lower sides of the prestressing tendon; there is a height difference between the first straight segment and the second straight segment.

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

[0014] In some implementations, the first curve segment and the second curve segment are smoothly connected.

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

[0016] In some implementations, the first straight segment and the second straight segment are arranged parallel to each other.

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

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

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

[0020] In another aspect, the application further provides a prestressed building, comprising a supporting body and the prestressed structure in the previous aspect. The first end and the second end of the prestressed structure body are fixedly connected with the supporting body, so that the prestressed structure body generates a pre-pressure at the first end and the second end.

[0021] Since the prestressed building comprises the prestressed structure in the previous aspect, the prestressed building has all the beneficial effects of the prestressed structure, which will not be repeated here.

[0022] In some embodiments, the supporting body comprises 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 and the internal beam is a prestressed structure.

[0024] In some embodiments, the supporting body comprises a body part, an outer frame beam and a floor. The body part comprises 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 body part, and the outer frame beam is connected with the body part at least through the floor. At least part of the floor is a prestressed structure, and the first end of the prestressed structure body is arranged in connection with the body part, and the second end of the prestressed structure body is arranged in connection with the outer frame beam. The upper side of the first end of the prestressed structure body is pre-compressed, and the lower side of the second end of the prestressed structure body is pre-compressed.

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

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

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

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

[0029] Figure 3 An application structure diagram of prestress between a core tube and an outer frame beam in a related art;

[0030] Figure 4 A bending moment distribution diagram of a prestressed structure between a core tube and an 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 A connection structure diagram of a prestressed structure shown in Figure 5

[0033] A connection structure diagram of a prestressed structure shown in Figure 7 Figure 3 A structure diagram of a prestressed structure including a tensioning hole shown in

[0034] Reference signs:

[0035] 100 - prestressed building;

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

[0037] 20 - outer frame beam;

[0038] 30 - floor slab;

[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 hole; DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0042] ​In the description of the application, it needs to be understood that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation. Therefore, it cannot be understood as a limitation on the application. Unless otherwise specified, the above orientation description can be flexibly arranged in the actual application process under the condition of meeting the relative positional relationship shown in the drawings.

[0043] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated, so that the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise specified, the meaning of "multiple" is two or more.

[0044] In the description of the application, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "communicating" should be understood broadly, such as fixed connection, detachable connection, integral connection. It can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the electrical connection between two elements, and those skilled in the art can understand the specific meaning of the above terms in the application according to the specific circumstances.

[0045] In the embodiments of the application, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of another identical element in the process, article or device including the element.

[0046] In the embodiments of the application, the words "exemplary" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the words "exemplary" or "for example" are intended to present the relevant concept in a specific manner.

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

[0048] By bearing of the main body part 10 and the outer frame beam 20, a plurality of floors 30 can be arranged at intervals in the up-down direction, that is, the interval space of two adjacent floors 30 in the up-down direction is the internal building space of the prestressed building 100, which is beneficial to improve the volume rate of the prestressed building 100.

[0049] It should be noted that the prestressed building 100 provided by the embodiments of the present application can 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 outside. Alternatively, the prestressed building 100 can 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 can also be a steel structure, a steel reinforced concrete structure, or a brick-concrete structure, etc., which is not limited.

[0050] The prestressed building 100 is taken as an example Figure 1 As shown, the core tube structure is taken as an example, the main body part 10 can include a core tube 11. The supporting main body can also include an internal beam 12. The number of core tubes 11 can be one, that is, the core tube 11 located in the outer frame beam 20 can be arranged by connecting the outer frame beam 20 through the floor 30. Alternatively, the number of core tubes 11 can also be multiple, multiple core tubes 11 are distributed at intervals and can be connected to form an integral structure through the internal beam 12, and the outer frame beam 20 can also be arranged by connecting with one or more core tubes 11 on the inside through multiple floors 30.

[0051] In other embodiments, the supporting main body can also include a shear wall, which connects the core tube 11 and the outer frame beam 20 through the shear wall structure. Alternatively, in the case that the core tube 11 and the outer frame beam 20 have a large span, one or more supporting columns are arranged below the internal beam 12, or the shear wall structure is arranged at least part of the position below the internal beam 12, which is used to improve the supporting effect of the internal beam 12 on the outer frame beam 20.

[0052] In some embodiments, continuing to refer to Figure 1 The prestressed building 100 can also include a plurality of peripheral support structures 40, which can be distributed at intervals around the core tube 11. As along the extension direction of the outer frame beam 20, the plurality of peripheral support structures 40 are distributed at intervals and connected with the outer frame beam 20, which is used to support the outer frame beam 20 to bear the vertical load at the outer frame beam 20.

[0053] At this point, 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 support structures 40.

[0054] For example, the peripheral support structure 40 can be columns distributed around the core tube 11. Alternatively, the peripheral support structure 40 can be a shear wall, as long as it can stably support the outer frame beam 20.

[0055] In some other embodiments, the outer frame beam 20 can also be configured as a suspended structure. This can reduce the vertical load at the outer frame beam 20 and further enhance the support strength of the main body 10 for the outer frame beam 20, so that the prestressed building 100 meets the design load requirements.

[0056] At this point, taking the outer frame beam 20 connected to the core tube 11 via the inner beam 12 and / or shear wall as an example, the extension length of the outer frame beam 20 between adjacent inner beams 12 and / or shear walls along the extension direction of the outer frame beam 20 can also be regarded as the span of the outer frame beam 20.

[0057] It should be noted that, in the case of a prestressed building 100 including peripheral support structures 40, taking the core tube 11 and outer frame beam 20 connected by internal beams 12, and the peripheral support structure 40 being columns as an example, in a single-story prestressed building 100, multiple columns can be correspondingly arranged with multiple internal beams 12. For example, one column can be connected to the end of an internal beam 12 away from the core tube 11 at the same position on the outer frame beam 20. 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] Taking the connection between the outer frame beam 20 and the core tube 11 via the connecting structure of the floor slab 30 and the internal beam 12 as an example. Figure 2 As shown, Figure 2 This is a schematic diagram of the bending moment distribution in a prestressed structure based on a related technology. Figure 2 In the diagram, the x-axis represents the extension length of the connecting structure from the core tube 11 to the outer frame beam 20, and the y-axis represents the different bending moment distributions of the connecting structure at different length locations. If the bending moment is above the x-axis, it indicates that the bottom of the plate of the connecting structure at that location is under compression; if the bending moment is below the x-axis, it indicates that the bottom of the plate of the connecting structure at that location is under tension.

[0059] Combination Figure 2 If traditional prestressed tension bars A are installed in the connection structure (such as floor slabs or internal beams) connecting the core tube 11 and the outer frame beam 20, such as... 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, which makes the middle region of the floor slab 30 bottom compressed and the two ends of the floor slab 30 bottom 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 and poor tensile strength, the arrangement of prestressed tensioning bars is beneficial to improve the stress condition of the reinforced concrete structure. For example, before the structure bears the load, prestressed tensioning bars are used to apply pressure to the structure in advance, so that the compressive stress in the tensile region of the concrete under the action of the external load can offset or reduce the tensile stress generated by the external load, so that the structure does not produce cracks or reduces the crack width under normal use.

[0061] 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 and poor tensile strength, the arrangement of prestressed tensioning bars is beneficial to improve the stress condition of the reinforced concrete structure. For example, before the structure bears the load, prestressed tensioning bars are used to apply pressure to the structure in advance, so that the compressive stress in the tensile region of the concrete under the action of the external load can offset or reduce the tensile stress generated by the external load, so that the structure does not produce cracks or reduces the crack width under normal use.

[0062] Since the load gravity of the floor slab 30 acts on the floor slab 30, the middle region of the floor slab 30 is tensile and the two ends of the floor slab 30 are compressed. That is, under the combined action 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 is small, and the floor slab 30 is not easy to crack and deform and damage.

[0063] However, when the outer frame beam 20 has a large span, the vertical deformation of the middle part of the outer frame beam 20 in the up-down direction is large, while the vertical deformation of the side of the core tube 11 is small or even negligible. Based on this, the vertical deformation of the middle part of the outer frame beam 20 will generate additional bending moment on the connected floor slab 30, so that the side connected with the outer frame beam is tensile and the side connected with the core tube is compressive.

[0064] Therefore, under the superimposed action of the gravity load and the prestressed tensioning force of the prestressed tensioning bars A, the tensile stress of the floor slab 30 of the traditional prestressed structure near the outer frame beam 20 is further increased, and the outer frame beam 20 has a large torsion moment, thereby reducing the torsion resistance of the outer frame beam 20 and the tensile bearing capacity of the floor slab 30.

[0065] That is, in combination with the prestressed tensioning bars A, the floor slab 30 of the traditional prestressed structure has a large compressive stress at the bottom of the floor slab 30 near the outer frame beam 20. Figure 1 In particular, the middle part of the outer frame beam 20 has a large compressive stress at the bottom of the floor slab 30 near the main part 10. Figure 4 That is, the floor slab 30 from the main part 10 to the outer frame beam 20 has a large compressive stress at the bottom of the floor slab 30 and then a tensile stress.

[0066] Therefore, as shown in FIG. 6, the prestressed structure provided by the present application can be used in the floor slab 30 of the traditional prestressed structure. Figure 5As shown, the prestressed structure 100 may include a prestressed structure 50, which may include a prestressed structure body 51 and prestressing tendons 52. The prestressed structure body 51 extends along a first direction and has a first end 511 and a second end 512 disposed opposite to each other. The first end and the second end of the prestressed structure body 51 are fixedly connected to a supporting body so that the prestressed structure body 51 generates prestress at the first end and the second end.

[0067] Prestressing tendons 52 can be disposed within the prestressed structure body 51 from the first end 511 to the second end 512. From the first end 511 to the second end 512, the prestressing tendon 52 includes a first straight segment 521, a first curved segment 522, a second curved segment 523, and a second straight segment 524 arranged sequentially. At least the first straight segment 521 is fixedly connected to the prestressed structure body 51 near the first end 511, and at least the second straight segment 524 is fixedly connected to the prestressed structure body 51 near the second end 512. At this time, the prestressing tendons 52 within the prestressed structure body 51 are in a tensioned state, so that the prestressed structure body 51 generates pre-compression at the first end 511 and the second end 512. Different types of forces can be generated at the first end 511 and the second end 512 of the prestressed structure body 51. For example, the lower side of the prestressed structure body 51 at the first end 511 is pre-tensioned, and the lower side of the prestressed structure body 51 at the second end 512 is pre-compressed.

[0068] By setting the prestressed tendons 52 in a tensioned state, a pre-compression force can be applied to the second end 512 of the prestressed structure body 51 to offset or reduce the tensile stress at the bottom of the slab caused by external loads. This allows the prestressed structure body 51 to stably bear the external load of the prestressed building 100 under normal use, thereby preventing the prestressed structure body 51 from cracking or being damaged by tension, and thus improving the bearing capacity of the prestressed structure 50.

[0069] In some embodiments, such as Figure 5 and Figure 6 As shown, at least a portion of the floor slab 30 connecting the core tube 11 and the outer frame beam 20 can be configured as the aforementioned prestressed structure 50. In this case, 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 closest to the outer frame beam 20 is pre-compressed at the bottom under the action of the prestressing tendons 52.

[0070] Thus, by setting the prestressed structure as the main body of the floor 30, the prestressed tendon 52 makes the floor 30 pre-compressed at the bottom of the end close to the outer frame beam 20 at the second end 512 of the floor 30 close to the outer frame beam 20. Thus, even if the mid-span portion of the outer frame beam 20 deforms due to vertical settlement, the bottom of the floor 30 close to the position is in tension. However, because the floor 30 is pre-compressed by the prestressed tendon 52 at this position, the tension of the bottom of the floor 30 caused by the external load (such as the connecting beam 20) can be offset or reduced, so that the floor 30 can stably bear the tension of the connecting beam 20, especially the mid-span portion, under normal use, to avoid cracking or damage of the floor 30 under tension.

[0071] For example, the prestressed building 100 shown in Figure 1 and Figure 6 By applying the above scheme, the axial force of the floor 30 of the prestressed structure around the core tube 11 is in compression, and the maximum axial compression per unit width is 900-1200 kN / m, and the maximum compression stress is 3-4 MPa, which is much smaller than the compressive design strength of C35 concrete. Therefore, by setting the floor 30 of the prestressed structure, the outer frame beam 20 outside the core tube 11 can be well supported, which is beneficial to reduce the vertical displacement and deformation of the outer frame beam 20 (especially the mid-span portion).

[0072] Through the action of the prestressed tendon 52, the floor 30 (i.e. the main body 51 of the prestressed structure) generates a reverse arch, the mid-span floor surface is in tension, and the bottom of the core tube 11 support is in tension, thereby reducing the bending moment of the floor 30 under the gravity load.

[0073] Through statistical measurement, in the prestressed building 100 shown in Figure 1 By setting at least part of the floor 30 as the prestressed structure 50, the vertical displacement and deformation of the outer frame beam 20 can be reduced by 5%-20%, and the bending moment of the floor 30 can be reduced by 30%-45%. The effect is remarkable, and the structure is simple.

[0074] In actual application, part of the floor 30 of the prestressed building 100 can be set as the prestressed structure 50. One or more of the internal beam 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 50 can be fixedly connected with the main body part 10 such as the core wall 11, the internal beam 12, the column and the shear wall. The upper side of the first end of the prestressed structure 50 can be pre-compressed. The second end 512 of the prestressed structure 50 can be suspended, that is, a cantilever structure. Alternatively, other building structures (such as the outer frame beam 20) can be fixedly connected at the second end of the prestressed structure 50, so that the prestressed structure 50 such as the floor 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 50 can be pre-compressed.

[0076] For the outer frame beam 20, due to the action of the load gravity, the vertical deformation amplitude (or displacement) of the outer frame beam 20 will be larger as it is closer to the midspan along the span direction.

[0077] Based on this, for the prestressed tendon 52 structure in the floor 30, one or more prestressed tendons 52 can be arranged in the floor 30 corresponding to the region near the midspan of the outer frame beam 20 along the extension direction of the outer frame beam 20, that is, the part of the floor 30 can be arranged as a prestressed structure 50 for sharing the load gravity of the outer frame beam 20, thereby reducing the vertical deformation degree of the midspan part of the outer frame beam 20.

[0078] In some embodiments, the connection region of the outer frame beam 20 and the prestressed structure main 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 region of the outer frame beam 20 and the prestressed structure main body 51 can be arranged near the midspan of the outer frame beam 20.

[0079] In this way, in the case of effectively preventing the vertical settlement deformation of the outer frame beam 20, by arranging part of the floor 30 as a prestressed structure 50, the structure of the floor 30 can be simplified.

[0080] For example, along the extension direction of the corresponding outer frame beam 20, the part of the floor 30 near the middle region has a prestressed tendon 52 arranged inside, that is, a prestressed structure 50. And the two sides of the prestressed structure 50 are conventional floor 30, that is, the simplified floor 30 structure can improve the construction speed of the prestressed building 100, simplify the construction difficulty, and reduce the construction cost, and also can improve the overall stability of the prestressed building 100.

[0081] In some embodiments, as shown in Figure 5 and Figure 6 the length of the first straight line segment 521 and the length of the corresponding prestressed structure main body 51 from the first end 511 to the second end 512 can be adjusted. And / or, the length of the second straight line segment 524 and the length of the corresponding prestressed structure main body 51 from the first end 511 to the second end 512 can be adjusted.

[0082] Thus, 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 structures.

[0083] For example, when the prestressed tendon 52 is arranged in the prestressed structure body 51, by adjusting the lengths of the first straight section 521 and the second straight section 524 and the length of the corresponding prestressed structure body 51, the first curved section 522 and the second curved section 523 can be arranged close to the first end 511 or close to the second end 512.

[0084] As the first end 511 of the prestressed structure body 51 is fixedly connected with the core tube 11, and the second end 512 of the prestressed structure body 51 is fixedly connected with the outer frame beam 20. The tensile stress of the prestressed structure body 51 caused by the vertical deformation of the outer frame beam 20 will cause the prestressed structure body 51 (the floor slab 30) to crack and damage near the core tube 11. Therefore, when arranging the prestressed tendon 52, the length of the first straight section 521 is reduced and the length of the second straight section 524 is increased, so that the first curved section 522 and the second curved section 523 are arranged close to the first end 521. At this time, the center of the inscribed circle of the first curved section 522 can be located below the first straight section 521, and the inscribed circle of the second curved section 523 can be located above the second straight section 524, so that there is a height difference between the first straight section 521 and the second straight section 524, which can solve the cracking and damage problem of the prestressed structure body 51 in this area when it is under tension.

[0085] For example, the first straight section 521 is smoothly connected with the first curved section 522. The first curved section 522 is smoothly connected with the second curved section 523. The second curved section 523 is smoothly connected with the second straight section 524. So that the preset force between the prestressed tendon 52 and the prestressed structure body 51 is smoothly transitioned.

[0086] In some embodiments, the first straight section 521 and the second straight section 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 structure body 51 as a reinforced concrete member, the arrangement of the prestressed tendon 52 in the prestressed structure body 51 includes the pretension method and the post-tension method. By applying a pre-compressive stress to the tension area of the reinforced concrete member, the elastic shrinkage force of the prestressed tendon 52 is transmitted to the reinforced concrete member through the bonding force or anchor between the prestressed tendon 52 and the reinforced concrete member, and a pre-compressive stress is generated.

[0088] The pre-tensioning method is to tension the pre-stressed tendon 52 before pouring the reinforced concrete member, and temporarily fix the tensioned pre-stressed tendon 52 on the pedestal or steel mold, and then pour the concrete. When the concrete reaches a certain strength (generally not less than 75% of the design strength level), the pre-stressed tendon is released, and the pre-compression stress of the reinforced concrete member is generated by the adhesion between the concrete and the pre-stressed tendon.

[0089] The post-tensioning method is to first pour the reinforced concrete member, and then tension the pre-stressed tendon 52. When the member or block is made, a hole is reserved in the place where the pre-stressed tendon 52 is placed. After the concrete reaches the design strength, the pre-stressed tendon 52 is inserted into the reserved hole, and the pre-stressed tendon 52 is tensioned to the design control stress by the tensioning device. Then the pre-stressed tendon 52 is anchored at the end of the member by the anchor, and finally the hole is grouted.

[0090] In some embodiments, the pre-stressed tendon 52 in the tensioning state to apply the preset compression stress to the pre-stressed structure body 51 includes a non-bonded pre-stressed structure and a bonded pre-stressed structure.

[0091] For example, the non-bonded pre-stressed structure is suitable for the post-tensioning method. A pre-set hole is provided in the pre-stressed structure body 51, so that the pre-stressed tendon 52 passes through the hole and is arranged by anchoring at the first end 511 and the second end 512 of the pre-stressed structure body 51. That is, the pre-stressed tendon 52 in the hole is only in contact with the pre-stressed structure body 51, and is not bonded. Only the two ends of the pre-stressed tendon 52 are anchored with the pre-stressed structure body 51, which has the characteristics of convenient construction.

[0092] In the bonded pre-stressed structure, the pre-stressed tendon 52 in the pre-stressed structure body 51 is completely bonded and fixed with the pre-stressed structure body 51, and has good mechanical properties. The pre-stressed tendon 52 can be pre-tensioned during construction, and can be directly formed by pouring. Alternatively, a hole can be reserved when the member is made, and after the pre-stressed tendon 52 is inserted and tensioned, a cement-based material or an epoxy-based material is grouted in the hole to bond and form the pre-stressed tendon 52 with the member. Subsequently, the tensioning anchoring structure at the two ends of the pre-stressed tendon 52 can be removed, so that the pre-stressed tendon 52 can apply the preset compression stress to the pre-stressed structure body 51.

[0093] That is, the pre-stressed structure 50 provided by the embodiments of the present application can be a pre-tensioning pre-stressed structure. Alternatively, the pre-stressed tendon 52 can also be a post-tensioning pre-stressed structure. The pre-stressed tendon 52 can also be provided as a post-tensioning and slow-bonding pre-stressed structure. The pre-stressed tendon 52 can also be provided as a post-tensioning and non-bonding pre-stressed structure. This is not limited.

[0094] In some embodiments, as Figure 7As shown, the prestressed structure 50 further comprises a prestressed tendon duct 53 and an adhesive layer (not shown). The prestressed structure body 51 is provided with the prestressed tendon duct 53 from the first end 511 to the second end 512, the prestressed tendon duct 53 is a through-hole structure, and the prestressed tendon 52 is located in the prestressed tendon duct 53 and arranged between the first end 511 and the second end 512. After positioning through the prestressed tendon duct 53 to tension the prestressed tendon 52 arranged between the first end 511 and the second end 512, an adhesive layer material such as a cement-based material or an epoxy-based material can be filled in the prestressed tendon duct 53. After the adhesive layer is cured, the cured adhesive layer can fixedly connect the prestressed tendon 52 and the prestressed structure body 51, so that the prestressed tendon 52 is integrated with the concrete structure to improve the integrity and cooperative working capacity, avoid the relative sliding between the prestressed tendon 52 and the concrete structure due to the relaxation of the end anchorage to cause the prestress loss, and reduce the bearing capacity of the prestressed structure.

[0095] The installation process of the prestressed tendon 52 described above is a bonded process, that is, in the prestressed tendon duct 53, the prestressed tendon 52 and the prestressed structure body 51 are fixedly connected through the setting of the adhesive layer.

[0096] Alternatively, the two ends of the prestressed tendon 52 can be anchored to the first end 511 and the second end 512 of the prestressed structure body 51 through a support without pouring adhesive material in the prestressed tendon duct 53. That is, the prestressed tendon 52 is installed by a non-bonded process.

[0097] In other embodiments, the prestressed tendon 52 can also be provided as a post-tensioned slow-bonding prestressed structure. That is, the prestressed tendon 52 has the characteristics of both bonded and non-bonded prestressed tendons, and a slow-bonding material is wrapped around the steel strand of the prestressed tendon 52. There is no bonding force between the prestressed tendon 52 and the slow-bonding material in the early stage, which is the same as the non-bonded system. The slow-bonding material is cured in the later stage, achieving the characteristics of high concrete strength utilization rate and more corrosion resistance of the bonded system. The slow-bonding material can be slow-setting mortar or epoxy resin, the former is a cement-based material, and the latter is an epoxy-based material. The stress performance of the epoxy resin material is similar to that of the bonded structure, and the curing 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 the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0099] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A pre-stressed structure, characterized in that, Comprising; a prestressed structure body, the structure body being a reinforced concrete structure; the prestressed structure body extends along a first direction and has oppositely arranged first and second ends; and a prestressed tendon, the prestressed tendon being arranged in the prestressed structure 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 segment is fixedly connected with the prestressed structure body near the first end, and at least the second straight segment is fixedly connected with the prestressed structure body near the second end; the prestressed tendon is in a tensioned state to generate a pre-pressure on the prestressed structure body at the first end and the second end.

2. The prestressed structure of claim 1, wherein, from the first end to the second end, the length of the first straight segment and the length of the corresponding prestressed structure body are adjustable; and / or, from the first end to the second end, the length of the second straight segment and the length of the corresponding prestressed structure body are adjustable.

3. The prestressed structure of claim 1, wherein, the centers of the inscribed circles of the first and second curved segments are located on the upper and lower sides of the prestressed tendon; the first straight segment and the second straight segment have a height difference therebetween; the first straight segment and the first curved segment are smoothly connected; and / or, the first curved segment and the second curved segment are smoothly connected; and / or, the second curved segment and the second straight segment are smoothly connected.

4. The pre-stressed structure of claim 1, wherein, the first straight segment and the second straight segment are arranged in parallel.

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: a prestressed tendon duct, the prestressed structure body is provided with the prestressed tendon duct from the first end to the second end, the prestressed tendon duct is a through-hole structure, and the prestressed tendon is located in the prestressed tendon duct and is arranged in tension between the first end and the second end.

7. A prestressed building, characterized in that, Comprising: a supporting body; and the prestressed structure as claimed in any one of claims 1-6, the first end and the second end of the prestressed structure body are fixedly connected with the supporting body to generate a pre-pressure on the prestressed structure body at the first end and the second end.

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

9. The prestressed building according to claim 7, characterized in that, the supporting body comprises: a main body part, the main body part comprising at least one of a core tube, an internal beam, a column and a shear wall; an outer frame beam, the outer frame beam being arranged around at least part of the main body part; and a floor, and the outer frame beam is connected with the main body part at least through the floor; wherein at least part of the floor is the prestressed structure, the first end of the prestressed structure body is arranged in connection with the main body part, the second end of the prestressed structure body is arranged in connection with the outer frame beam, the first end of the prestressed structure body is pre-stressed on the upper side, and the second end of the prestressed structure body is pre-stressed on the lower side.

10. The prestressed building according to claim 9, characterized in that, the prestressed building further comprises: A plurality of peripheral support structures are arranged along the extension direction of the outer frame beam, and are connected with the outer frame beam to support the outer frame beam; In 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 region of the outer frame beam and the prestressed structure body accounts for 1 / 4 to 1 / 3 of the span of the outer frame beam, and the connection region of the outer frame beam and the prestressed structure body is arranged close to the midspan of the outer frame beam.

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