Precast concrete I-shaped beam for bridge structure and bridge structure

Abstract

The utility model relates to the technical field of bridge structures, in particular to a prefabricated concrete I-beam for a bridge structure and the bridge structure, the I-beam comprises a top plate, a web plate, a bottom plate and a first anchorage device, the first anchorage device is embedded in the I-beam, and the first anchorage device is located at the junction of the top plate and the web plate; first prestressed tendons are tensioned between the oppositely arranged first anchorage devices; the first anchorage device comprises a first spiral rib, the first spiral rib wraps the first prestressed rib at intervals, the first spiral rib comprises a first rib section and a second rib section which are connected, and the first rib section and the second rib section are sequentially arranged in the direction from the end face of the I-shaped beam where the first anchorage device is located to the end face of the other side of the I-shaped beam; and the radial sectional area wrapped by the second section of rib is smaller than the radial sectional area wrapped by the first section of rib. The first spiral rib is arranged in a segmented reducing mode, so that the first anchorage device can maintain enough pressure stress strength to guarantee the tensile property of the I-shaped beam while adapting to the size of the thin web plate and avoiding stress concentration or cracking.

Description

Technical Field

[0001] This utility model relates to the field of bridge structure technology, and in particular to a precast concrete I-beam for bridge structures and a bridge structure. Background Technology

[0002] With the continuous advancement of technology in the construction industry, prefabricated assembly structures have gradually become the mainstream structural form in bridge and building engineering. Prefabrication allows for the large-scale production of I-beams in factories, avoiding the limitations of on-site construction conditions and significantly improving construction efficiency. However, in practical engineering applications, prefabricated I-beams still face many technical challenges. The most prominent challenge lies in the fact that traditional anchorages and their sub-anchoring structures cannot fully meet the design requirements of new prefabricated beams. I-beams with uniform cross-sections are typically designed as thin-web structures to optimize material usage and load-bearing performance. However, existing anchorage structures are often too bulky in both the transverse width and depth directions, making it difficult to adapt to the shape of thin webs. This can lead to localized stress concentration or cracking in the web, thereby weakening the overall structural performance. Furthermore, traditional anchorages and sub-anchoring structures primarily serve thick-web designs, lacking targeted optimization for the characteristics of thin webs. In web areas with complex stress paths and limited space, traditional structural measures struggle to guarantee the efficiency and uniformity of stress transfer, thus affecting the load-bearing performance and service life of the I-beam. Utility Model Content

[0003] The purpose of this invention is to overcome the technical problem that existing anchorages, due to their structural characteristics, are prone to local stress concentration or cracking when applied to thin-web precast I-beams, thereby weakening the overall structural performance. This invention provides a precast concrete I-beam and bridge structure for use in bridge structures.

[0004] In a first aspect, this utility model provides a precast concrete I-beam for bridge structures, comprising a top plate, a web, a bottom plate, and a first anchorage. The top plate and the bottom plate are opposite to each other and spaced apart. The web is disposed between the top plate and the bottom plate, and intersects with both the top plate and the bottom plate. The first anchorage is disposed opposite to each other on both ends of the I-beam, and is embedded in the I-beam. The first anchorage is located at the junction of the top plate and the web. A first prestressing tendon is tensioned between the oppositely disposed first anchorages. The first anchorage includes a first spiral bar, which is spaced around the first prestressing tendon. The first spiral bar includes a first section bar and a second section bar connected together. The first section bar and the second section bar are sequentially arranged along the direction from the end face of the I-beam where the first anchorage is located to the end face of the other side of the I-beam. The radial cross-sectional area of ​​the second section bar is smaller than the radial cross-sectional area of ​​the first section bar.

[0005] The I-beam of this application has a first anchorage at the junction of the top plate and the web. Since the web of the precast concrete I-beam is relatively thin and the junction between the top plate and the web at the end face is also small, in order to adapt to the size constraints at this location, the first spiral reinforcement in the first anchorage can be configured with a variable diameter, that is, the first spiral reinforcement is divided into a first section and a second section, wherein the wrapping range of the second section is smaller than that of the first section. Since the second section is embedded deeper in the I-beam, the smaller wrapping range allows the first half of the first spiral reinforcement to adapt to the junction area between the top plate and the web with a smaller cross-sectional area, while the first section is closer to the end face of the I-beam, which allows it to maintain a larger wrapping range to wrap a larger volume of concrete, and to apply greater compressive stress to the concrete within its wrapping range. This, in turn, allows the prestressed tendons to maintain greater tension to improve the tensile performance of the I-beam. Therefore, configuring the first spiral reinforcement with a segmented variable diameter allows the first anchorage to adapt to the thin web size to avoid stress concentration or cracking while maintaining sufficient compressive stress strength to ensure the tensile performance of the I-beam.

[0006] Preferably, the first anchorage further includes a first sleeve and a second sleeve that are joined together. The first sleeve passes through the first section of reinforcing bar, and the second sleeve passes through the second section of reinforcing bar. Both the first sleeve and the second sleeve are sleeved on the first prestressed tendon. The end face of the first sleeve away from the second sleeve is flush with the end face of the I-beam where the first anchorage is located.

[0007] Preferably, the diameter of the first sleeve decreases along the direction from the end face of the I-beam where the first anchor is located toward the second sleeve.

[0008] Preferably, a first anchor plate is formed on the outer wall of the first sleeve, the first anchor plate is located at the end of the first sleeve with a larger diameter, and a first grouting hole is opened on the first anchor plate; a first working anchor plate and a first working clamp are also provided on the end face of the first sleeve away from the second sleeve, the first working clamp is clamped on the first prestressing tendon and passes through the first working anchor plate.

[0009] Preferably, second anchors are provided opposite to each other on the end faces of the web, the second anchors are embedded in the web, and second prestressing tendons are tensioned between the oppositely provided second anchors. The width of the projection of the second anchor on the end face of the web is smaller than the width of the web.

[0010] Preferably, the second anchorage includes a second helical reinforcement, which is wrapped around the second prestressing tendon at intervals, and the projection of the area wrapped by the second helical reinforcement on the end face of the web is rectangular.

[0011] Preferably, the second anchor further includes a third sleeve and a second anchor plate. The third sleeve is sleeved on the second prestressed tendon and located in the second spiral tendon. The second anchor plate is connected to the third sleeve, and the end face of the second anchor plate away from the third sleeve is flush with the end face of the web where the second anchor is located.

[0012] Preferably, the second anchor plate is provided with a second working anchor plate and a second working clamp on the end face away from the third sleeve, and the second working clamp is clamped on the second prestressing tendon and passes through the second working anchor plate.

[0013] Preferably, a second grouting hole is provided on the second anchor plate.

[0014] In a second aspect, the present invention provides a bridge structure, characterized in that it includes a precast concrete I-beam for a bridge structure as described above.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model provides a precast concrete I-beam and bridge structure for bridge construction. By varying the diameter of the first spiral reinforcement in the first anchorage located at the junction of the thin web and the top slab, the first spiral reinforcement is divided into a first section and a second section. The wrapping range of the second section is smaller than that of the first section. Since the second section is embedded deeper in the I-beam, the smaller wrapping range allows the first half of the first spiral reinforcement to adapt to the junction area between the top slab and the web, which has a smaller cross-sectional area. The first section is closer to the end face of the I-beam, allowing it to maintain a larger wrapping range to enclose a larger volume of concrete. This allows for greater compressive stress to be applied to the concrete within its wrapping range, thereby maintaining greater tension in the prestressing tendons to improve the tensile performance of the I-beam. Therefore, segmenting the first spiral reinforcement with varying diameter allows the first anchorage to adapt to the size of the thin web to avoid stress concentration or cracking while maintaining sufficient compressive stress strength to ensure the tensile performance of the I-beam. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the end face of the precast concrete I-beam used in bridge structures according to the present invention.

[0018] Figure 2 This is a front view schematic diagram of the precast concrete I-beam used in bridge structures according to this utility model.

[0019] Figure 3 This is a schematic diagram of the first anchor.

[0020] Figure 4 for Figure 3 The left view.

[0021] Figure 5 This is a schematic diagram of the second anchor.

[0022] Figure 6 for Figure 5 The left view.

[0023] Marked in the image:

[0024] 1. Top plate, 2. Web plate, 3. Bottom plate, 4. First anchorage, 41. First spiral reinforcement, 411. First section reinforcement, 412. Second section reinforcement, 42. First sleeve, 43. Second sleeve, 44. First anchor plate, 441. First grouting hole, 45. First working anchor plate, 46. First working wedge, 5. Second anchorage, 51. Second spiral reinforcement, 52. Third sleeve, 53. Second anchor plate, 531. Second grouting hole, 54. Second working anchor plate, 55. Second working wedge, 6. First prestressing tendon, 7. Second prestressing tendon. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Example 1

[0032] This embodiment provides a precast concrete I-beam for bridge structures.

[0033] Figure 1 This is a schematic diagram of the end face of the precast concrete I-beam used in bridge structures according to the present invention. Figure 2 This is a front view schematic diagram of the precast concrete I-beam used in bridge structures according to 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.

[0034] like Figures 1 to 6 As shown in the figure, the precast concrete I-beam for bridge structure described in this embodiment may include a top plate 1, a web plate 2, a bottom plate 3, and a first anchorage 4. The top plate 1 and the bottom plate 3 are arranged opposite each other and spaced apart. The web plate 2 is arranged between the top plate 1 and the bottom plate 3, and intersects with both the top plate 1 and the bottom plate 3. That is, the top plate 1, the web plate 2, and the bottom plate 3 can be connected to form an I-beam structure. The top plate 1, the web plate 2, and the bottom plate 3 can be cast integrally. The first anchorage 4 is arranged opposite each other on the end faces of both sides of the I-beam. The first anchorage 4 is embedded in the I-beam and is located at the junction of the top plate 1 and the web plate 2. A first prestressing tendon 6 is tensioned between the oppositely arranged first anchorages 4. The first anchorage 4 includes a first spiral tendon 41, which is spaced around the first prestressing tendon 6. The first spiral reinforcement 41 includes a first section 411 and a second section 412 connected together. The first section 411 and the second section 412 are arranged sequentially along the direction from the end face of the I-beam where the first anchor 4 is located to the end face of the other side of the I-beam. The radial cross-sectional area wrapped by the second section 412 is smaller than the radial cross-sectional area wrapped by the first section 411. The first anchor 4 can be tightly clamped at both ends of the first prestressing tendon 6 to tension the first prestressing tendon 6. The tensioned first prestressing tendon 6 can be embedded in the concrete I-beam. The tensioned first prestressing tendon 6 can apply compressive stress to the concrete through the first anchor 4 at both ends. When the concrete beam is under tension, this compressive stress can offset the compressive stress on the concrete beam, thus improving the tensile strength of the concrete beam.

[0035] The I-beam of this application has a first anchorage 4 at the junction of the top plate 1 and the web 2. Since the web 2 of the precast concrete I-beam is relatively thin, and the junction between the top plate 1 and the web 2 at the end face is also small, to accommodate the dimensional constraints at this location, the first spiral reinforcement 41 in the first anchorage 4 can be configured with a variable diameter. That is, the first spiral reinforcement 41 is divided into a first section 411 and a second section 412, where the wrapping range of the second section 412 is smaller than that of the first section 411. Because the second section 412 is embedded deeper in the I-beam, the smaller wrapping range can... The first spiral reinforcement 41 is designed to adapt to the junction area between the top plate 1 and the web 2, which has a smaller cross-sectional area. The first section 411 is closer to the end face of the I-beam, which allows it to maintain a larger wrapping range to wrap a larger volume of concrete. This allows for the application of greater compressive stress to the concrete within its wrapping range, thereby enabling the prestressed tendons to maintain greater tension and improve the tensile performance of the I-beam. Therefore, segmenting the first spiral reinforcement 41 with varying diameters allows the first anchorage 4 to maintain sufficient compressive stress strength to ensure the tensile performance of the I-beam while adapting to the thin web size to avoid stress concentration or cracking.

[0036] The first anchorage 4 can also be set on the base plate 3. Relatively speaking, the cross-sectional area of ​​the base plate 3 is larger than that of the top plate 1 and the web plate 2. Therefore, multiple first anchorages 4 can be set on the base plate 3. By tensioning multiple corresponding prestressing tendons through multiple first anchorages 4, compressive stress can be applied to the concrete at multiple locations on the base plate 3, which can improve the tensile performance of the base plate 3. Here, the number, position and arrangement of the first anchorages 4 set on the base plate 3 and the arrangement of multiple first anchorages 4 can be arbitrarily selected as needed. This utility model does not make specific limitations in this regard.

[0037] In this embodiment, the first anchor 4 further includes a first sleeve 42 and a second sleeve 43 that are connected. The first sleeve 42 passes through the first section of reinforcement 411, and the second sleeve 43 passes through the second section of reinforcement 412. Both the first sleeve 42 and the second sleeve 43 are sleeved on the first prestressed tendon 6. The end face of the first sleeve 42 away from the second sleeve 43 is flush with the end face of the I-beam where the first anchor 4 is located. The first spiral reinforcement 41 can be simultaneously sleeved on the first sleeve 42 and the second sleeve 43 for fixation. An annular space can be formed between the first spiral reinforcement 41, the first sleeve 42, and the second sleeve 43. After concrete is poured into the annular space, the first spiral reinforcement 41 can be tightly bound to the concrete in the annular space and apply compressive stress to the concrete in the annular space to fix the first anchor 4 and maintain the tension of the first prestressed tendon 6 after tensioning.

[0038] Optionally, the diameter of the first sleeve 42 decreases along the direction from the end face of the I-beam where the first anchor 4 is located toward the second sleeve 43; that is, the first sleeve 42 can be conical in shape, and the end with the smaller diameter can be connected to the second sleeve 43, while the end face of the end with the larger diameter can be flush with the end face of the I-beam. The diameter of the second sleeve 43 can be slightly smaller than the diameter of the end with the smaller diameter of the first sleeve 42, so that the second sleeve 43 can be inserted from the end with the smaller diameter of the first sleeve 42 for connection; the conical first sleeve 42 can cooperate with the straight pipe structure of the second sleeve 43 to tighten the first prestressing tendon 6; here, the second sleeve 43 can be a metal corrugated pipe, but the present invention is not limited to this, the shape of the first sleeve 42 can also be other shapes, such as a straight pipe structure, and the second sleeve 43 can also be other types of tubular structures, the present invention does not specifically limit this.

[0039] In this embodiment, a first anchor plate 44 is formed on the outer wall of the first sleeve 42. The first anchor plate 44 is located at the end of the first sleeve 42 with a larger diameter. A first grouting hole 441 is provided on the first anchor plate 44. Specifically, the shape of the first anchor plate 44 can be a circular plate structure, and the first grouting hole 441 can be opened at the upper left or upper right corner of the first anchor plate 44. A first working anchor plate 45 and a first working clamp 46 are also provided on the end face of the first sleeve 42 away from the second sleeve 43. The first working clamp 46 is clamped on the first prestressing tendon 6 and passes through the first working anchor plate 45. The first sleeve 42 and the first anchor plate 44 can be connected by integral forming. The spiral reinforcement 41 can be axially positioned by abutting against the first anchor plate 44. The outer side of the first anchor plate 44 is provided with a first working anchor plate 45 and a first working clamp 46. The first prestressed tendon 6 is tightened by the cooperation of the first working anchor plate 45 and the first working clamp 46. Specifically, the first working anchor plate 45 has a tapered hole, and the inner diameter of the tapered hole decreases along the direction from the first working anchor plate 45 to the first sleeve 42. The outer wall of the first working clamp 46 has a tapered surface that cooperates with the tapered hole. When the first prestressed tendon 6 is tensioned and subjected to tension, the first working clamp 46 can be pressed against the tapered hole on the first working anchor plate 45 for axial positioning, so that the first prestressed tendon 6 maintains tension.

[0040] In this embodiment, second anchors 5 are provided opposite to each other on the end faces of the web 2. The second anchors 5 are embedded in the web 2, and second prestressing tendons 7 are tensioned between the oppositely provided second anchors 5. The width of the projection of the second anchors 5 on the end face of the web 2 is smaller than the width of the web 2. In order to adapt to the thin web size of the precast I-beam, the width of the second anchors 5 provided on the web 2 needs to be controlled within the width range of the web 2. This allows the second anchors 5 to apply tension to the second prestressing tendons 7 while avoiding stress concentration in the thin web that could cause the web 2 to crack, and at the same time, it can improve the tensile performance of the web 2.

[0041] Optionally, the second anchorage 5 includes a second spiral reinforcement 51, which is spaced around the second prestressing tendon 7. The projection of the area wrapped by the second spiral reinforcement 51 on the end face of the web 2 is rectangular. Setting the second spiral reinforcement 51 as a rectangular structure can better adapt to the thin web size of the precast I-beam. At the same time, the width of the rectangle can be smaller than the width of the web 2. The rectangular structure can also adapt to the stress distribution characteristics of the concrete wrapped by the second prestressing tendon 7 and the second spiral reinforcement 51 in the thin web, thus avoiding stress concentration and cracking in the thin web to a greater extent.

[0042] In this embodiment, the second anchor 5 further includes a third sleeve 52 and a second anchor plate 53. The third sleeve 52 is sleeved on the second prestressed tendon 7 and located in the second spiral tendon 51. The second anchor plate 53 is connected to the third sleeve 52, and the end face of the second anchor plate 53 away from the third sleeve 52 is flush with the end face of the web 2 where the second anchor 5 is located. Here, the second anchor plate 53 can be a rectangular structure with the same rectangle formed by the second spiral tendon 51. Here, the third sleeve 52 can be a corrugated metal pipe. The second spiral tendon 51 can be sleeved on the third sleeve 52 for fixation. The second spiral tendon 51 can abut against the second anchor plate 53 for axial positioning. An annular space can be formed between the second spiral tendon 51 and the third sleeve 52. After concrete is poured into the annular space, the second spiral tendon 51 can be tightly bound to the concrete in the annular space and apply compressive stress to the concrete in the annular space to fix the second anchor 5 and maintain the tension of the second prestressed tendon 7 after tensioning.

[0043] In this embodiment, a second working anchor plate 54 and a second working clamp 55 are provided on the end face of the second anchor plate 53 away from the third sleeve 52. The second working clamp 55 is clamped onto the second prestressing tendon 7 and passes through the second working anchor plate 54. The second working anchor plate 54 and the second working clamp 55 are provided on the outer side of the second anchor plate 53. The second prestressing tendon 7 is tightly clamped by the cooperation of the second working anchor plate 54 and the second working clamp 55. Specifically, a tapered hole is opened on the second working anchor plate 54, and the inner diameter of the tapered hole decreases along the direction of the second working anchor plate 54 towards the third sleeve 52. The outer wall of the second working clamp 55 forms a tapered surface that cooperates with the tapered hole. When the second prestressing tendon 7 is tensioned and subjected to tension, the second working clamp 55 can be pressed against the tapered hole on the second working anchor plate 54 for axial limitation, so that the second prestressing tendon 7 maintains tension.

[0044] Alternatively, a second grouting hole 531 may be provided on the second anchor plate 53. Since the second anchor plate 53 is rectangular and the space on the thin web is limited, the second grouting hole 531 may be provided directly above the second prestressing tendon 7.

[0045] Example 2

[0046] This embodiment provides a bridge structure.

[0047] The bridge structure described in this embodiment includes precast concrete I-beams for bridge structures as described in Embodiment 1; the precast concrete I-beams can form the bridge body structure; in addition, the bridge structure described in this embodiment may also include piers, bridge decks, etc., with the bridge deck laid on top of the bridge body structure and the piers supported below the bridge body structure.

[0048] It should be noted that the precast concrete I-beams used for bridge structures described in this embodiment are the same as those used for bridge structures described in Embodiment 1, and will not be described in detail here.

[0049] In summary, the precast concrete I-beam and bridge structure of this utility model for bridge structures can be modified by changing the diameter of the first spiral reinforcement in the first anchorage located at the junction of the thin web and the top plate. This involves dividing the first spiral reinforcement into a first segment and a second segment, with the second segment having a smaller wrapping range than the first segment. Since the second segment is embedded deeper in the I-beam, the smaller wrapping range allows the first half of the first spiral reinforcement to adapt to the smaller cross-sectional area of ​​the junction between the top plate and the web. The first segment, being closer to the end face of the I-beam, maintains a larger wrapping range to enclose a larger volume of concrete, applying greater compressive stress to the concrete within its wrapping range. This, in turn, allows the prestressing tendons to maintain greater tension, improving the tensile performance of the I-beam. Therefore, segmenting the first spiral reinforcement allows the first anchorage to adapt to the thin web size, avoiding stress concentration or cracking, while maintaining sufficient compressive stress strength to ensure the tensile performance of the I-beam.

[0050] 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 for bridge structures, characterized in that, It includes a top plate (1), a web plate (2), a bottom plate (3) and a first anchor (4). The top plate (1) and the bottom plate (3) are opposite to each other and spaced apart. The web plate (2) is disposed between the top plate (1) and the bottom plate (3). The web plate (2) intersects with the top plate (1) and the bottom plate (3) respectively. The first anchorage (4) is provided opposite to each other on the end faces of the two sides of the I-beam. The first anchorage (4) is embedded in the I-beam and is located at the junction of the top plate (1) and the web plate (2). The first prestressed tendon (6) is tensioned between the oppositely provided first anchorages (4). The first anchor (4) includes a first spiral bar (41), which is wrapped around the first prestressed tendon (6) at intervals. The first spiral bar (41) includes a first section bar (411) and a second section bar (412) connected to each other. The first section bar (411) and the second section bar (412) are arranged sequentially along the direction from the end face of the I-beam where the first anchor (4) is located to the end face of the other side of the I-beam. The radial cross-sectional area wrapped by the second section bar (412) is smaller than the radial cross-sectional area wrapped by the first section bar (411).

2. The precast concrete I-beam for bridge structures according to claim 1, characterized in that, The first anchor (4) also includes a first sleeve (42) and a second sleeve (43) that are connected. The first sleeve (42) is inserted into the first section of reinforcement (411), and the second sleeve (43) is inserted into the second section of reinforcement (412). The first sleeve (42) and the second sleeve (43) are both sleeved on the first prestressed tendon (6). The end face of the first sleeve (42) away from the second sleeve (43) is flush with the end face of the I-beam where the first anchor (4) is located.

3. The precast concrete I-beam for bridge structures according to claim 2, characterized in that, The diameter of the first sleeve (42) decreases along the direction from the end face of the I-beam where the first anchor (4) is located toward the second sleeve (43).

4. The precast concrete I-beam for bridge structures according to claim 3, characterized in that, A first anchor plate (44) is formed on the outer wall of the first sleeve (42). The first anchor plate (44) is located at the end of the first sleeve (42) with a larger diameter. A first grouting hole (441) is opened on the first anchor plate (44). A first working anchor plate (45) and a first working clamp (46) are also provided on the end face of the first sleeve (42) away from the second sleeve (43). The first working clamp (46) is clamped on the first prestressed tendon (6) and passes through the first working anchor plate (45).

5. The precast concrete I-beam for bridge structures according to claim 1, characterized in that, The web plate (2) has two second anchors (5) on opposite ends. The second anchors (5) are embedded in the web plate (2). The second anchors (5) are tensioned between the opposite second anchors (5). The width of the projection of the second anchor (5) on the end face of the web plate (2) is smaller than the width of the web plate (2).

6. The precast concrete I-beam for bridge structures according to claim 5, characterized in that, The second anchor (5) includes a second spiral bar (51), which is wrapped around the second prestressed tendon (7) at intervals. The projection of the area wrapped by the second spiral bar (51) on the end face of the web (2) is rectangular.

7. The precast concrete I-beam for bridge structures according to claim 6, characterized in that, The second anchor (5) also includes a third sleeve (52) and a second anchor plate (53). The third sleeve (52) is sleeved on the second prestressed tendon (7) and located in the second spiral tendon (51). The second anchor plate (53) is connected to the third sleeve (52). The end face of the second anchor plate (53) away from the third sleeve (52) is flush with the end face of the web (2) where the second anchor (5) is located.

8. The precast concrete I-beam for bridge structures according to claim 7, characterized in that, The second anchor plate (53) is provided with a second working anchor plate (54) and a second working clamp (55) on the end face away from the third sleeve (52). The second working clamp (55) is clamped on the second prestressed tendon (7) and passes through the second working anchor plate (54).

9. The precast concrete I-beam for bridge structures according to claim 8, characterized in that, The second anchor plate (53) has a second grouting hole (531).

10. A bridge structure, characterized in that, Including the precast concrete I-beams for bridge structures as described in any one of claims 1 to 9.

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