Prefabricated concrete I-shaped beam with uniformly distributed prestress and bridge

Abstract

The utility model relates to the technical field of prestressed concrete beam structures, in particular to a precast concrete I-beam with evenly distributed prestress and a bridge, the I-beam comprises a first-section beam, a second-section beam and a third-section beam which are connected in sequence, prestressed tendons are arranged in the I-beam in a penetrating mode, and the two ends of the prestressed tendons are connected with anchorage devices. The prestressed ribs comprise a first-section rib in the first-section beam, a second-section rib in the second-section beam and a third-section rib in the third-section beam, and the first-section rib and the third-section rib are integrally connected to the two ends of the second-section rib; the first-section rib and the third-section rib respectively extend towards the middle along the two ends of the I-shaped beam, the distance between the first-section rib and the bottom of the I-shaped beam is gradually reduced, and the first-section rib and the third-section rib form an arc shape with an upward opening; and the second section rib is horizontally arranged. The prestressed tendon structure with the two ends bent upwards effectively improves stress distribution in the I-shaped beam structure, deformation caused by sinking of the midspan part of the I-shaped beam can be avoided to a great extent, and distribution of prestress in the beam body is more uniform.

Description

TECHNICAL FIELD

[0001] The utility model relates to prestressed concrete beam structure technical field, especially a prefabricated concrete I beam and bridge of prestress uniform distribution. BACKGROUND

[0002] With the development of building engineering industrialization, prefabricated assembly type concrete structure is widely used in infrastructure construction due to its obvious advantages. Among them, the equal cross-section I beam as a standardized prefabricated component becomes an important choice in bridge construction due to its excellent mechanical properties and adaptability. Traditional cast-in-place structure needs to consume a lot of manpower and time, while prefabricated assembly type I beam can be mass-produced in factory environment, greatly improving production efficiency, shortening construction period, and effectively reducing the disturbance to the environment of construction site. In addition, industrialized production helps the uniformity of product quality, reduces the quality hidden danger in construction, and further guarantees the safety and durability of the structure. Through the adoption of standardized design and factory manufacturing, prefabricated assembly type I beam can also reduce material waste and promote efficient use of resources, which makes it become an engineering technical solution in line with the concept of sustainable development. Under the impetus of market demand, the application scale of prefabricated assembly type equal cross-section I beam is continuously expanding.

[0003] Although prefabricated assembly type concrete equal cross-section I beam has obvious advantages in industrialized manufacturing, the arrangement mode of prestressed steel strand in traditional prefabricated concrete I beam gradually shows the problem of not matching modern industrialized production. On the one hand, the traditional steel strand arrangement is usually dominated by small diameter and multiple prestressed steel strands, which will lead to complex steel strand arrangement in factory production, increased construction period, and higher difficulty in adapting automatic equipment. On the other hand, the traditional arrangement mode of prestressed reinforcement is usually overall horizontal arrangement, which is less optimized for the actual stress characteristics of equal cross-section I beam, and is prone to uneven prestress distribution, affecting the structural performance of the beam body. SUMMARY

[0004] The utility model aims at overcoming the technical problem that prestressed reinforcement in the prefabricated concrete beam structure of prior art is prone to uneven prestress distribution when arranged horizontally as a whole, and provides a prefabricated concrete I beam and bridge of prestress uniform distribution.

[0005] In a first aspect, the utility model provides a prefabricated concrete H beam of prestress even distribution, including first section beam, second section beam and third section beam who are connected in turn along the length direction of H beam, a plurality of prestressed tendon is arranged in the H beam, both ends of the prestressed tendon are connected with the anchor device, the prestressed tendon includes first section tendon in the first section beam, second section tendon in the second section beam and third section tendon in the third section beam, the first section tendon and the third section tendon are integrally connected at both ends of the second section tendon respectively, the first section tendon and the third section tendon extend along the direction of the two ends of the H beam to the middle part and the spacing of the bottom of the H beam decreases gradually, the first section tendon and the third section tendon are formed into arc shape and the opening of the arc shape faces upwards, the second section tendon is arranged horizontally along the length direction of the H beam.

[0006] The prefabricated concrete H beam is a H beam structure prefabricated by the pretensioning method, the trend of the prestressed tendon in the interior is horizontal straight line, however, the H beam is used as the beam body structure of the bridge and can be regarded as the simply supported beam structure, after being erected in the beam body of the bridge, the supporting force is only applied to the two ends of the H beam, for the H beam with large span, the middle part is easy to sink and make the two ends warp upwards, and the prestress in the beam body is not evenly distributed when the phenomenon occurs, thereby leading to the cracking or damage of the beam body structure, the part of the prestressed tendon close to the two ends of the H beam is designed as the structure of bending upwards in the application, the shear bearing capacity can be provided for the part of the H beam receiving the supporting force, the middle inverted arch is reduced, the tensile stress on the upper edge of the beam plate at the supporting point is reduced, that is to say, the prestressed tendon structure of bending upwards at the two ends effectively improves the stress distribution in the H beam structure, the distribution of the prestress in the beam body is more uniform, and the deformation of the H beam due to the sinking of the middle part can be avoided to a great extent.

[0007] Preferably, the H beam comprises a top plate, a bottom plate and a web plate connected between the top plate and the bottom plate, the anchor device comprises a first anchor device and a second anchor device, the first anchor device is arranged at the junction of the top plate and the web plate, and the second anchor device is arranged on the web plate.

[0008] Preferably, the first anchor device comprises a first spiral tendon spacedly wrapped around the prestressed tendon, the first spiral tendon comprises a first section spiral tendon and a second section spiral tendon connected with each other, the second section spiral tendon is located between the first section spiral tendon and the second section tendon, and the radial cross-sectional area wrapped by the second section spiral tendon is smaller than the radial cross-sectional area wrapped by the first section spiral tendon.

[0009] Preferably, the first anchor further includes a first sleeve and a second sleeve that are connected together. The first sleeve is correspondingly disposed in the first section of spiral reinforcement, and the second sleeve is correspondingly disposed in the second section of spiral reinforcement. Both the first sleeve and the second sleeve are sleeved on the prestressing tendon.

[0010] Preferably, the first sleeve is a cone, and the second sleeve is connected to the end of the first sleeve with a smaller diameter; a first pad is formed at the end of the first sleeve with a larger diameter, and the end face of the first pad is flush with the end face of the I-beam.

[0011] Preferably, the second anchorage includes a second spiral reinforcement, a third sleeve, and a second pad. The second spiral reinforcement is wrapped around the prestressing tendon at intervals. The projection of the area wrapped by the second spiral reinforcement on the end face of the web is rectangular, and the width of the rectangle is smaller than the width of the web. The third sleeve is sleeved on the prestressing tendon and located in the second spiral reinforcement. The second pad is connected to the third sleeve.

[0012] Preferably, an end plate assembly is provided on the end face of the web, the end plate assembly includes a first end plate and a second end plate, the first end plate is flush with the end face of the web, the second end plate is disposed on the first end plate and perpendicular to the first end plate, and the second end plate is embedded in the web.

[0013] Preferably, the end plate assembly further includes a plurality of shear studs, which are embedded in the web and arranged on the first end plate and respectively located on both sides of the second end plate.

[0014] Preferably, the second end plate has several through holes.

[0015] In a second aspect, the present invention provides a bridge, including a bridge body and piers connected below the bridge body, wherein the bridge body includes precast concrete I-beams with uniformly distributed prestress as described above.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention provides a precast concrete I-beam and bridge with uniformly distributed prestress. By designing the prestressing tendons near both ends of the I-beam to be curved upwards, it can provide shear bearing capacity to the parts of the I-beam subjected to supporting forces at both ends, reduce mid-span camber, and reduce tensile stress at the upper edge of the beam slab at the support points. The upward-curving prestressing tendon structure at both ends effectively improves the stress distribution in the I-beam structure, making the prestress distribution in the beam more uniform, which can largely prevent the mid-span of the I-beam from settling and deforming. In addition, using prestressing tendons with larger diameters and reducing the number of prestressing tendons distributed in the beam can better adapt to the precast production equipment of the I-beam, improve the precast production efficiency, and also optimize the structural stress. Attached Figure Description

[0018] Figure 1 This is a schematic diagram showing the arrangement of prestressing tendons in the precast concrete I-beam of this utility model.

[0019] Figure 2 This is a schematic diagram showing the arrangement of the end face anchorages of the precast concrete I-beam of this utility model.

[0020] Figure 3 This is a schematic diagram of the first anchor.

[0021] Figure 4 for Figure 3 The left view.

[0022] Figure 5 This is a schematic diagram of the second anchor.

[0023] Figure 6 for Figure 5 The left view.

[0024] Figure 7 This is the front view of the endplate assembly.

[0025] Figure 8 This is a side view of the endplate assembly.

[0026] Marked in the image:

[0027] 1. First beam section, 2. Second beam section, 3. Third beam section, 4. Prestressed tendon, 41. First tendon section, 42. Second tendon section, 43. Third tendon section, 5. Top slab, 6. Bottom slab, 7. Web plate, 8. First anchorage, 81. First spiral reinforcement, 811. First spiral reinforcement section, 812. Second spiral reinforcement section, 82. First sleeve, 83. Second sleeve, 84. First pad plate, 841. First grouting hole, 85. First anchor plate, 86. First clamping plate, 9. Second anchorage, 91. Second spiral reinforcement, 92. Third sleeve, 93. Second pad plate, 931. Second grouting hole, 94. Second anchor plate, 95. Second clamping plate, 10. End plate assembly, 101. First end plate, 102. Second end plate, 1021. Through hole, 103. Shear stud. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0029] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0031] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0032] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0033] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0034] Example 1

[0035] This embodiment provides a precast concrete I-beam with uniformly distributed prestress.

[0036] Figure 1 This is a schematic diagram showing the arrangement of prestressing tendons in the precast concrete I-beam of this utility model. Figure 2 This is a schematic diagram showing the arrangement of the end face anchorages of the precast concrete I-beam of this utility model. Figure 3 This is a schematic diagram of the structure of the first anchorage; Figure 4 for Figure 3 The left view; Figure 5 This is a schematic diagram of the second anchorage. Figure 6 for Figure 5 The left view; Figure 7 This is the front view of the endplate assembly; Figure 8 This is a side view of the endplate assembly.

[0037] like Figures 1 to 6As shown in the figure, the precast concrete I-beam with uniformly distributed prestress described in this embodiment may include a first beam 1, a second beam 2, and a third beam 3 connected sequentially along the length of the I-beam. The first beam 1, the second beam 2, and the third beam 3 can be integrally connected to form an overall I-beam structure. Multiple prestressing tendons 4 are threaded through the I-beam, and anchorages are connected to both ends of each prestressing tendon 4. The prestressing tendon 4 includes a first tendon 41 located in the first beam 1, a second tendon 42 located in the second beam 2, and a third tendon 43 located in the third beam 3. The first tendon 41 and the third tendon 43 are integrally connected. The first section 41, the second section 42, and the third section 43 are connected to the two ends of the second section 42, that is, the first section 41, the second section 42, and the third section 43 can be connected in sequence to form the overall structure of the prestressed tendon 4; the first section 41 and the third section 43 extend from both ends of the I-beam toward the middle and the spacing between them decreases from the bottom of the I-beam; the first section 41 and the third section 43 are both formed in an arc shape with the opening of the arc facing upward; that is, the two ends of the second section 42, namely the first section 41 and the third section 43, can be in an upwardly curved arc structure; the second section 42 can be horizontally arranged in the second beam 2 along the length of the I-beam.

[0038] The precast concrete I-beam is an I-beam structure precast using the pre-tensioning method. The prestressing tendons 4 inside it run horizontally. However, when the precast concrete I-beam is used as the beam structure of a bridge, it can be considered a simply supported beam structure. After being erected in the bridge beam, the supporting force it experiences only acts on the two ends of the I-beam. For I-beams with large spans, the mid-span portion is prone to sinking, causing the two ends to warp upwards. When this phenomenon occurs, the horizontally oriented prestressing tendons can easily lead to uneven distribution of prestress in the beam, resulting in cracking or damage to the beam structure. This application addresses this issue by designing the prestressing tendons 4 closer to the two ends of the I-beam... The upward-curving structure provides shear capacity to the supporting portions of the I-beam, reduces mid-span camber, and lowers tensile stress at the upper edge of the beam slab at the supports. In other words, the upward-curving prestressing tendons 4 effectively improve the stress distribution in the I-beam structure, making the prestressing more evenly distributed in the beam and greatly preventing mid-span subsidence and deformation. In addition, using prestressing tendons 4 with a larger diameter and reducing the number of prestressing tendons 4 distributed in the beam can better adapt to the prefabrication equipment of the I-beam, improve prefabrication efficiency, and optimize the structural stress.

[0039] In this embodiment, the I-beam includes a top plate 5, a bottom plate 6, and a web 7 connected between the top plate 5 and the bottom plate 6. The anchorage includes a first anchorage 8 and a second anchorage 9. The first anchorage 8 is located at the junction of the top plate 5 and the web 7, and the second anchorage 9 is located on the web 7. Different anchorages (first anchorage 8 and second anchorage 9) and prestressing tendons 4 can be set in different areas on the end face of the I-beam, so that the prestressing tendons 4 can be used to apply compressive stress to the concrete at different locations to counteract the tensile stress that may cause the concrete to crack, especially in areas where the stress is relatively concentrated on the I-beam, such as the junction of the top plate 5 and the web 7 and on the web 7. In addition, multiple first anchorages 8 can also be set on the bottom plate 6 to enhance the tensile performance of the bottom plate 6.

[0040] In this embodiment, the first anchorage 8 includes first spiral bars 81 spaced around the prestressing tendons 4. The first spiral bars 81 include a first spiral bar segment 811 and a second spiral bar segment 812 connected to each other. The second spiral bar segment 812 is located between the first spiral bar segment 811 and the second spiral bar segment 42. The radial cross-sectional area of ​​the second spiral bar segment 812 is smaller than that of the first spiral bar segment 811. Since the web plate 7 is relatively thin, that is, its width is small, the area of ​​the end face at the junction between the top plate 5 and the web plate 7 is also small. To adapt to the size limitation at the junction between the top plate 5 and the web plate 7, the diameter of the first spiral bar 81 in the first anchorage 8 can be varied. Specifically, the first spiral bar 81 can be divided into a first spiral bar segment 811 and a second spiral bar segment 812, and the wrapping range of the second spiral bar segment 812 is different from that of the first spiral bar segment 811. Specifically, the longitudinal cross-sectional area of ​​the wrapping region of the second spiral reinforcement 812 can be smaller than that of the wrapping region of the first spiral reinforcement 811. Since the second spiral reinforcement 812 is buried deeper in the I-beam, the smaller wrapping range allows the first half of the first spiral reinforcement 81 to adapt to the smaller interface area between the top plate 5 and the web plate 7. The first spiral reinforcement 811 is close to the end face of the I-beam, which allows the first spiral reinforcement 811 to maintain its original wrapping range, and thus can wrap around a relatively large volume of concrete. This allows the first spiral reinforcement 811 to apply greater pressure to the concrete inside, and allows the prestressed tendons 4 to maintain greater tension so that the I-beam can maintain sufficient tensile strength. Therefore, setting the first spiral reinforcement 81 in segments with varying diameters allows the first anchorage 8 to adapt to the thin web to prevent stress concentration while maintaining sufficient compressive strength to maintain the tensile strength of the I-beam.

[0041] In this embodiment, the first anchor 8 further includes a first sleeve 82 and a second sleeve 83, which can be connected to each other. The first sleeve 82 is correspondingly disposed in the first section of spiral reinforcement 811, and the second sleeve 83 is correspondingly disposed in the second section of spiral reinforcement 812. The first sleeve 82 and the second sleeve 83 are respectively sleeved on the prestressing tendon 4. The first spiral reinforcement 81 can be sleeved on the first sleeve 82 and the second sleeve 83 simultaneously, and an annular space gap can be formed between the first spiral reinforcement 81, the first sleeve 82, and the second sleeve 83. The first spiral reinforcement 81 can be tightly bound to the concrete in the annular space gap, applying compressive stress to the concrete in the annular space gap, thereby fixing the first anchor 8 and maintaining the tension of the prestressing tendon 4 after tensioning.

[0042] Alternatively, the first sleeve 82 can be formed into a cone shape, with a first pad 84 formed at the end of the first sleeve 82 with a larger diameter. The end face of the first pad 84 is flush with the end face of the I-beam. The second sleeve 83 is connected to the end of the first sleeve 82 with a smaller diameter. The diameter of the second sleeve 83 can be slightly smaller than the diameter of the end of the first sleeve 82 with a smaller diameter, so that the second sleeve 83 can be inserted and connected from the end of the first sleeve 82 with a smaller diameter. The first sleeve 82 and the second sleeve 83 can together tighten the prestressing tendon 4. Here, the second sleeve 83 can be a corrugated pipe made of metal, but the present invention is not limited to this. The first sleeve 82 can also be other structures, such as a straight pipe, and the second sleeve 83 can also be other shapes. The present invention does not specifically limit these.

[0043] Optionally, the first pad 84 is provided with a first grouting hole 841 that communicates with the inner cavity of the first sleeve 82. Specifically, the shape of the first pad 84 can be a circular plate, and the first grouting hole 841 can be opened at the corner of the first pad 84, such as the upper left corner or the upper right corner. Of course, the present invention is not limited to this. The shape of the first pad 84 can also be other shapes, such as square, etc. The first grouting hole 841 can also be opened at other positions on the first pad 84, for example, directly above the hole through which the prestressing tendon 4 passes on the first pad 84. The present invention does not specifically limit this.

[0044] In addition, the first pad 84 is provided with a first anchor plate 85 and a first clamping plate 86 on its end face. The first clamping plate 86 is clamped on the prestressing tendon 4 and passes through the first anchor plate 85. The first sleeve 82 and the first pad 84 can be integrally formed and connected. The first spiral reinforcement 81 can abut against the first pad 84 to achieve axial positioning. The cooperation of the first anchor plate 85 and the first clamping plate 86 can tighten the prestressing tendon 4. Here, the first anchor plate 85 has a tapered hole. The inner diameter of the tapered hole gradually decreases from the first anchor plate 85 toward the second sleeve 83. The outer wall of the first clamping plate 86 has a tapered surface. The tapered surface cooperates with the tapered hole. When the prestressing tendon 4 is tensioned and subjected to tension, the first clamping plate 86 can abut against the tapered hole of the first anchor plate 85 to achieve axial positioning and maintain the tension of the prestressing tendon 4.

[0045] In this embodiment, the second anchor 9 includes a second spiral bar 91, which wraps around the prestressing tendon 4 and forms an annular space gap between the second spiral bar 91 and the prestressing tendon 4. The projection of the area surrounded by the second spiral bar 91 on the end face of the web 7 can be formed as a rectangle, and the width of the rectangle is smaller than the width of the web 7. In order to adapt to the small width of the web 7 of the precast I-beam, the width of the second anchor 9 set on the web 7 needs to be controlled within the width range of the web 7. This allows the second anchor 9 to apply tension to the prestressing tendon 4 while avoiding stress concentration in the web 7 that could cause cracking of the web 7, and at the same time improving the tensile performance of the web 7.

[0046] In this embodiment, the second anchor 9 further includes a third sleeve 92 and a second pad 93. The third sleeve 92 is located in the second spiral reinforcement 91 and is sleeved on the prestressing tendon 4. The third sleeve 92 and the second pad 93 can be connected to each other. The end face of the second pad 93 is flush with the end face of the web 7. Here, the second pad 93 can also be a rectangular plate, the same as the rectangle formed by the second spiral reinforcement 91. Here, the third sleeve 92 can be a corrugated pipe made of metal. The second spiral reinforcement 91 can be axially positioned against the second pad 93 and sleeved on the third sleeve 92. An annular space gap can be formed between the third sleeve 92 and the second spiral reinforcement 91. The second spiral reinforcement 91 can tighten the concrete in the annular space gap and apply compressive stress to the concrete in the second spiral reinforcement 91, thereby fixing the second anchor 9 and maintaining the tension of the prestressing tendon 4.

[0047] Optionally, the second pad 93 is provided with a second grouting hole 931 that communicates with the inner cavity of the third sleeve 92. Specifically, the second pad 93 can be a square plate, and the second grouting hole 931 can be opened directly above the hole through which the prestressing tendon 4 passes in the second pad 93. Of course, the present invention is not limited to this. The shape of the second pad 93 can also be other shapes, such as a circle with a diameter smaller than the width of the web 7. The second grouting hole 931 can also be opened in other positions on the second pad 93, such as the upper left corner or the upper right corner of the second pad 93. The present invention does not specifically limit this.

[0048] In addition, a second anchor plate 94 and a second clamping plate 95 are provided on the end face of the second pad 93. The second clamping plate 95 is clamped on the prestressing tendon 4 and passes through the second anchor plate 94. The cooperation of the second anchor plate 94 and the second clamping plate 95 can tightly clamp the prestressing tendon 4. Specifically, the second anchor plate 94 has a tapered hole, and the inner diameter of the tapered hole gradually decreases from the second anchor plate 94 toward the third sleeve 92. The outer wall of the second clamping plate 95 is formed with a tapered surface, which can cooperate with the tapered hole. After the prestressing tendon 4 is tensioned, the second clamping plate 95 can be pressed against the tapered hole of the second anchor plate 94 to limit its position and maintain the tension of the prestressing tendon 4.

[0049] In this embodiment, an end plate assembly 10 is provided on the end face of the web 7. The end plate assembly 10 includes a first end plate 101 and a second end plate 102. The first end plate 101 is flush with the end face of the web 7, and the second end plate 102 is disposed on the first end plate 101 and perpendicular to the first end plate 101. The second end plate 102 is embedded in the web 7. By providing the end plate assembly 10 on the end face of the web 7 of the I-beam, especially by embedding the second end plate 102 in the web 7, the strength of the stress concentration area on the web 7 can be enhanced.

[0050] Optionally, the end plate assembly 10 may also include a plurality of shear studs 103, which may be embedded in the web 7. The plurality of shear studs 103 are arranged on the first end plate 101 and located on both sides of the second end plate 102 respectively. The shear studs 103 are perpendicular to the first end plate 101 and parallel to the second end plate 102. Setting the shear studs 103 on the first end plate 101 and embedding them in the web 7 can also strengthen the strength of the stress concentration area on the web 7 and prevent cracking on the web 7. Of course, the number and arrangement of the shear studs 103 on the first end plate 101 are not limited.

[0051] Alternatively, the second end plate 102 may have multiple through holes 1021. The through holes 1021 may be arranged along the width direction of the web 7, that is, along the length direction of the second end plate 102. The reinforcing bars in the I-beam may pass through the through holes 1021 and be clamped onto the second end plate 102, thereby strengthening the fastening connection of the reinforcing bars at the end of the web 7 through the second end plate 102.

[0052] Example 2

[0053] This embodiment provides a bridge.

[0054] The bridge described in this embodiment includes a bridge body (not shown in the figure) and piers (not shown in the figure) connected below the bridge body. The bridge body includes precast concrete I-beams with uniformly distributed prestress as described in Embodiment 1. The precast concrete I-beams can form the bridge structure. In addition, the bridge structure described in this embodiment may also include a bridge deck, etc., which is laid on top of the bridge body structure.

[0055] It should be noted that the precast concrete I-beam with uniformly distributed prestress described in this embodiment is the same as the precast concrete I-beam with uniformly distributed prestress described in Embodiment 1, and will not be described in detail in this embodiment.

[0056] In summary, this utility model provides a precast concrete I-beam and bridge with uniformly distributed prestress. By designing the prestressing tendons near both ends of the I-beam to be curved upwards, it can provide shear bearing capacity for the parts of the I-beam subjected to supporting forces at both ends, reduce mid-span camber, and reduce tensile stress at the upper edge of the beam slab at the support points. The upward-curving prestressing tendon structure at both ends effectively improves the stress distribution in the I-beam structure, making the prestress distribution in the beam more uniform, which can largely prevent the mid-span of the I-beam from settling and deforming. In addition, using prestressing tendons with larger diameters and reducing the number of prestressing tendons distributed in the beam can better adapt to the precast production equipment of the I-beam, improve the precast production efficiency, and also optimize the structural stress.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A precast concrete I-beam with uniformly distributed prestress, characterized in that, The beam includes a first section beam (1), a second section beam (2), and a third section beam (3) connected sequentially along the length of the I-beam. Several prestressing tendons (4) are threaded through the I-beam. Anchorages are connected to both ends of each prestressing tendon (4). Each prestressing tendon (4) includes a first section tendon (41) located in the first section beam (1), a second section tendon (42) located in the second section beam (2), and a third section tendon (43) located in the third section beam (3). The first section tendon (41) and the third section tendon (43) are integrally connected to both ends of the second section tendon (42). The first section (41) and the third section (43) extend from both ends of the I-beam toward the middle and decrease in distance from the bottom of the I-beam. The first section (41) and the third section (43) are both formed in an arc shape with the opening of the arc facing upward. The second section (42) is horizontally arranged along the length of the I-beam.

2. The precast concrete I-beam with uniformly distributed prestress according to claim 1, characterized in that, The I-beam includes a top plate (5), a bottom plate (6) arranged opposite to each other, and a web plate (7) connecting the top plate (5) and the bottom plate (6). The anchor includes a first anchor (8) and a second anchor (9). The first anchor (8) is located at the junction of the top plate (5) and the web plate (7), and the second anchor (9) is located on the web plate (7).

3. The precast concrete I-beam with uniformly distributed prestress according to claim 2, characterized in that, The first anchor (8) includes a first spiral bar (81) that is spaced around the prestressed tendon (4). The first spiral bar (81) includes a first spiral bar segment (811) and a second spiral bar segment (812) connected to each other. The second spiral bar segment (812) is located between the first spiral bar segment (811) and the second bar segment (42). The radial cross-sectional area of ​​the second spiral bar segment (812) is smaller than the radial cross-sectional area of ​​the first spiral bar segment (811).

4. The precast concrete I-beam with uniformly distributed prestress according to claim 3, characterized in that, The first anchor (8) also includes a first sleeve (82) and a second sleeve (83) that are connected. The first sleeve (82) is correspondingly disposed in the first section of spiral reinforcement (811), and the second sleeve (83) is correspondingly disposed in the second section of spiral reinforcement (812). Both the first sleeve (82) and the second sleeve (83) are sleeved on the prestressed tendon (4).

5. The precast concrete I-beam with uniformly distributed prestress according to claim 4, characterized in that, The first sleeve (82) is a cone, and the second sleeve (83) is connected to the smaller diameter end of the first sleeve (82); a first pad (84) is formed at the larger diameter end of the first sleeve (82), and the end face of the first pad (84) is flush with the end face of the I-beam.

6. The precast concrete I-beam with uniformly distributed prestress according to claim 2, characterized in that, The second anchor (9) includes a second spiral bar (91), a third sleeve (92), and a second pad (93). The second spiral bar (91) is wrapped around the prestressing tendon (4) at intervals. The projection of the area wrapped by the second spiral bar (91) on the end face of the web (7) is rectangular. The width of the rectangle is smaller than the width of the web (7). The third sleeve (92) is sleeved on the prestressing tendon (4) and located in the second spiral bar (91). The second pad (93) is connected to the third sleeve (92).

7. The precast concrete I-beam with uniformly distributed prestress according to any one of claims 2 to 6, characterized in that, An end plate assembly (10) is provided on the end face of the web (7). The end plate assembly (10) includes a first end plate (101) and a second end plate (102). The first end plate (101) is flush with the end face of the web (7). The second end plate (102) is disposed on the first end plate (101) and perpendicular to the first end plate (101). The second end plate (102) is embedded in the web (7).

8. The precast concrete I-beam with uniformly distributed prestress according to claim 7, characterized in that, The end plate assembly (10) also includes a plurality of shear studs (103), which are embedded in the web (7) and are arranged on the first end plate (101) and located on both sides of the second end plate (102).

9. The precast concrete I-beam with uniformly distributed prestress according to claim 7, characterized in that, The second end plate (102) has several through holes (1021).

10. A bridge, characterized in that, The bridge includes a bridge body and piers connected below the bridge body, wherein the bridge body comprises a precast concrete I-beam with uniformly distributed prestress as described in any one of claims 1 to 9.

Images