Prestressed concrete beam structure with prestress reinforcing function

Abstract

The utility model discloses a prestressed concrete beam structure with a prestressed reinforcement function, which comprises a concrete beam main body, end head anchor protecting plates are respectively arranged at two ends of the concrete beam main body, end head cavities are arranged on the inner sides of the end head anchor protecting plates, flat plates are arranged on the outer sides of the end head anchor protecting plates, and the end parts of the concrete beam main body are inserted into the end head cavities to be fixed. A main prestressed steel strand is embedded in the concrete beam body, the two ends of the main prestressed steel strand penetrate out of the concrete beam body, a main penetrating hole penetrating through the interior and the exterior is formed in the end anchor protection plate, the end of the main prestressed steel strand penetrates through the main penetrating hole, and the main prestressed anchorage device is arranged on the outer side of the end anchor protection plate. The main prestressed anchorage device clamps and pulls the two ends of the main prestressed steel strand oppositely. According to the utility model, the local pressure intensity of the concrete beam is greatly reduced, so that the end head of the concrete beam is not easy to break, and the prestressed concrete beam is well protected. According to the utility model, the auxiliary prestressed steel strands are arranged, so that the prestress of the concrete beam can be improved, and the prestress reinforcement of the concrete beam is further realized.

Description

Technical Field

[0001] The utility model belongs to the field of civil engineering construction, and in particular relates to a prestressed concrete beam structure with a prestressed reinforcement function. Background Art

[0002] Prestressed concrete beam is a structural form that prestresses a certain amount of concrete in advance to improve the bearing capacity and bending resistance of concrete beams. Prestressing technology is an advanced structural design method that introduces prestressing in concrete beams to enable them to resist the effects of external loads when subjected to force, thereby improving their overall performance.

[0003] The advantages of prestressed concrete beams mainly include the following aspects:

[0004] 1. Prestressed concrete beams have a higher load-bearing capacity. Through prestressing technology, a sufficiently large prestress can be applied to the concrete beam so that it can withstand a larger load when subjected to force, thereby increasing the beam's load-bearing capacity and extending its service life.

[0005] 2. Prestressed concrete beams have good seismic performance. Prestressing technology can effectively improve the seismic performance of concrete beams, enabling them to better maintain structural integrity and stability when natural disasters such as earthquakes occur, reducing the risk of damage and collapse.

[0006] 3. Prestressed concrete beams have a longer service life. Since prestressing technology can effectively reduce cracks and deformations in concrete beams and improve their durability and anti-aging capabilities, the service life of prestressed concrete beams is usually longer than that of traditional concrete beams.

[0007] 4. The construction period of prestressed concrete beams is relatively short. Although the construction process of prestressed concrete beams is relatively complicated and requires precise calculations and construction techniques, due to its high bearing capacity and earthquake resistance, it can reduce the volume and weight of the structure, thereby reducing construction costs and time.

[0008] In general, prestressed concrete beams are an advanced structural form with excellent structural performance, long service life and short construction period. They are widely used in bridges, buildings, tunnels and other projects, providing safer and more reliable structural guarantees for the projects.

[0009] The existing prestressed concrete beams have the following problems:

[0010] 1. The prestressed anchor is directly connected to the end of the prestressed concrete beam. The retraction force generated by the prestressed steel strand will directly act on the end of the prestressed concrete beam through the prestressed anchor. As the force is applied, the concrete at the end of the concrete beam is easy to fall off, affecting the strength and appearance of the prestressed concrete beam;

[0011] 2. After the prestressed concrete beam is used, as time goes by, the steel strands in the prestressed concrete beam will gradually stretch and lose elasticity, and the prestress in the concrete beam will also decrease, which will cause the compressive performance of the prestressed concrete beam to decrease. Therefore, it is necessary to design a concrete beam structure that can conveniently and timely reinforce the prestressed concrete beam to solve the problem of the compressive performance of the prestressed concrete beam decreasing over time. Utility Model Content

[0012] In order to overcome the problems mentioned in the background technology, the utility model provides a prestressed concrete beam structure with prestressed reinforcement function. To achieve the above technical purpose, the technical solution adopted by the utility model is:

[0013] A prestressed concrete beam structure with prestressed reinforcement function comprises a concrete beam body, end guard anchor plates are respectively arranged at both ends of the concrete beam body, an end cavity is opened on the inner side of the end guard anchor plate, and the outer side of the end guard anchor plate is a flat plate, the end of the concrete beam body is inserted into the end cavity for fixation, a main prestressed steel strand is buried in the concrete beam body, both ends of the main prestressed steel strand pass through the concrete beam body, a main through hole is arranged on the end guard anchor plate, the end of the main prestressed steel strand passes through the main through hole, a main prestressed anchor is arranged on the outer side of the end guard anchor plate, and the main prestressed anchor clamps and pulls both ends of the main prestressed steel strand.

[0014] To optimize the above technical solutions, the specific measures taken also include:

[0015] The width of the above-mentioned end anchor plate is greater than the width of the concrete beam body. A number of symmetrical secondary perforations are provided on the end anchor plate. The secondary perforations penetrate the end anchor plate inside and outside. The ends of the secondary prestressed steel strands pass through the secondary perforations. The secondary prestressed anchor is arranged on the outside of the end anchor plate. The secondary prestressed anchor clamps and pulls the two ends of the secondary prestressed steel strand. The secondary prestressed steel strand is located outside the concrete beam body.

[0016] The auxiliary prestressed steel strands are located below the main body of the concrete beam or on the left and right sides of the main body of the concrete beam.

[0017] The above-mentioned main prestressed anchor and secondary prestressed anchor both include a clip and an anchor sleeve. The main prestressed steel strand or the secondary prestressed steel strand passes through the clip. The clip can clamp and fix the main prestressed steel strand or the secondary prestressed steel strand. The anchor sleeve is sleeved on the outer surface of the clip and fixedly connected to the clip. The anchor sleeve rests on the outer side of the end anchor guard plate.

[0018] The above-mentioned main perforation and secondary perforation are composed of a narrow hole section and a wide hole section. One end of the narrow hole section is connected to the end cavity, and the other end is connected to one end of the wide hole section. The other end of the wide hole section is connected to the outer side surface of the end anchor plate. The diameter of the wide hole section is larger than the diameter of the anchor sleeve, the diameter of the narrow hole section is smaller than the diameter of the anchor sleeve, the depth of the wide hole section is smaller than the length of the anchor sleeve, the clip and the anchor sleeve are partially inserted into the wide hole section, and the anchor sleeve rests on the transition surface between the narrow hole section and the wide hole section.

[0019] The number of the above-mentioned main prestressed steel strands is multiple, and correspondingly, the number of the main perforations is also multiple.

[0020] The number of the main prestressed steel strands is three, and the number of the secondary prestressed steel strands is two.

[0021] After one end of the auxiliary prestressed steel strand passes through the corresponding clip, a 150 mm long steel strand is left uncut, and the 150 mm long steel strand is used to connect the end of the auxiliary prestressed steel strand with the jack.

[0022] The above-mentioned end anchor plate is a steel plate.

[0023] The beneficial effects of the utility model are:

[0024] The utility model installs end anchor plates at both ends of a concrete beam body, wraps the end of the concrete beam body with the end cavity of the end anchor plates, and then arranges the main prestressed anchor on the outside of the end anchor plates. The main prestressed anchor clamps and pulls the two ends of the main prestressed steel strand. The main prestressed anchor generates pressure on the end anchor plates, and the end anchor plates evenly disperse the pressure to the two ends of the concrete beam body, which greatly reduces the local pressure of the concrete beam, makes the end of the concrete beam not easy to break, and thus plays a better protective role on the prestressed concrete beam.

[0025] The end anchor plate of the utility model is provided with secondary perforations and corresponding secondary prestressed anchors and secondary prestressed steel strands. The secondary prestressed steel strands do not pass through the interior of the concrete beam body, but are located on both sides or the lower part of the concrete beam body, and do not affect the load-bearing capacity of the top of the concrete beam body. When the concrete beam body needs to be prestressed, the secondary prestressed steel strands are first connected by a jack, and then the secondary prestressed anchor is released, and the secondary prestressed steel strands are tensioned by the jack, so that the secondary prestressed steel strands obtain better prestress again, and the prestress is transmitted to the end of the concrete beam through the end anchor plate, so that the prestress of the concrete beam is increased, thereby realizing the prestressed reinforcement of the concrete beam.

[0026] The main through-hole and the auxiliary through-hole of the end anchor plate of the utility model are composed of a narrow hole section and a wide hole section. Through the cooperation of the wide and narrow hole sections, the clip and the anchor sleeve are partially inserted into the wide hole section, which can provide better protection for the clip and the anchor sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the utility model;

[0028] Figure 2 yes Figure 1 Left view of;

[0029] Figure 3 yes Figure 1 A top view of

[0030] Figure 4 It is a schematic diagram of the internal structure of the prestressed concrete beam structure;

[0031] Figure 5 yes Figure 4 A magnified view of the structure of part A;

[0032] Figure 6 This is a schematic diagram of the concrete beam when the main body is poured but the prestressed steel strands are not installed;

[0033] Figure 7 It is a schematic diagram of the internal structure of the end anchor plate.

[0034] The accompanying drawings are marked as: concrete beam body 1, end anchor plate 2, end cavity 21, main perforation 22, narrow hole section 22a, wide hole section 22b, secondary perforation 23, main prestressed steel strand 3, main prestressed anchor 4, clip 41, anchor sleeve 42, secondary prestressed steel strand 5, secondary prestressed anchor 6, prestressed channel casing 7. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0036] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0037] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0038] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation and may indicate the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or units (units) is not limited to the listed steps or units, but may also include unlisted steps or units, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" / "several" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0039] The utility model discloses a prestressed concrete beam structure with a prestressed reinforcement function, the main structure comprising a concrete beam body 1, an end anchor plate 2, a main prestressed steel strand 3, a main prestressed anchor 4, a secondary prestressed steel strand 5 and a secondary prestressed anchor 6, wherein the main prestressed steel strand 3 and the secondary prestressed steel strand 5, the main prestressed anchor 4 and the secondary prestressed anchor 6 have the same structure, and the only difference is that the positions are different.

[0040] The structure of the end anchor plate 2 is as follows Figure 7As shown, the end anchor plate 2 is installed at both ends of the concrete beam body 1. The end anchor plate 2 has two sides, the end facing the concrete beam body 1 is the inner side, and the end away from the concrete beam body 1 is the outer side. The inner side of the end anchor plate 2 has an end cavity 21, and the end of the concrete beam body 1 is inserted into the end cavity 21 for fixing. The end anchor plate 2 is also provided with a main through hole 22 and a secondary through hole 23. The main through hole 22 and the secondary through hole 23 have the same structure, only the position is different. The main through hole 22 and the secondary through hole 23 both include a narrow The hole section 22a and the wide hole section 22b, the inner end of the narrow hole section 22a is connected to the end cavity 21, and the outer end is connected to the inner end of the wide hole section 22b, and the outer end of the wide hole section 22b is connected to the outer side of the end anchor plate 2, the diameter of the wide hole section 22b is larger than the diameter of the anchor sleeve 42, the diameter of the narrow hole section 22a is smaller than the diameter of the anchor sleeve 42, the depth of the wide hole section 22b is smaller than the length of the anchor sleeve 42, the clip 41 and the anchor sleeve 42 are partially inserted into the wide hole section 22b, and the anchor sleeve 42 is against the transition surface between the narrow hole section 22a and the wide hole section 22b. For specific connection details, see Figure 5 .

[0041] The main prestressed anchor 4 and the auxiliary prestressed anchor 6 both include a detachable clip 41 and an anchor sleeve 42. The clip 41 is made of metal and has a certain clamping force, which can fix the steel strand inside the clip. Then, the anchor sleeve 42 is installed on the outside of the clip. The anchor sleeve is made of metal and has a certain fixing force, which can fix the clip and the steel strand. The clip 41 and the anchor sleeve 42 are commonly used components in prestressed anchors, and usually need to be used in combination with an anchor pad. However, since the utility model has an end anchor plate 2, the anchor pad can be omitted during tensioning, and the end anchor plate 2 can be directly used as the anchor pad for tensioning.

[0042] The auxiliary prestressed anchor 6 of the utility model is arranged outside the end anchor plate 2, and the auxiliary prestressed anchor 6 clamps and pulls the two ends of the auxiliary prestressed steel strand 5, and the auxiliary prestressed steel strand 5 is located outside the concrete beam body 1.

[0043] The utility model provides multiple main prestressed steel strands 3 according to actual needs. Figure 1-7 In the figure, the number of main prestressed steel strands 3 is three, but in fact, the number of main prestressed steel strands 3 can reach more than ten or dozens. Correspondingly, the number of auxiliary prestressed steel strands 5 should also be increased. Generally, the number of auxiliary prestressed steel strands 5 is one half to two thirds of the main prestressed steel strands 3.

[0044] The following is an introduction to the preparation method of the prestressed concrete beam structure of the present invention: tying the concrete beam steel bars, burying the prestressed channel sleeve 7 in the concrete beam steel cage, installing end anchor plates 2 at both ends of the concrete beam steel cage, aligning the main through-hole 22 with the prestressed channel sleeve 7, building a concrete beam template outside the concrete beam steel cage, and then pouring concrete in the concrete beam template. After the concrete beam solidifies, remove the prestressed channel sleeve 7, use the main prestressed steel strand 3 to penetrate the prestressed channel, and both ends of the main prestressed steel strand 3 pass through the main through-hole 22. Both ends of the main prestressed steel strand 3 are clamped with the main prestressed anchor 4, one end of which is fixed and the other end is not fixed first, and the main prestressed steel strand 3 at the unfixed end is tensioned with a jack. After the tensioning is completed, the main prestressed steel strand 3 at the tensioned end is fixed with the main prestressed anchor 4, and then the jack is removed to cut off the excess main prestressed steel strand 3. Then, both ends of the auxiliary prestressed steel strand 5 are passed through the auxiliary through-hole 23, and both ends of the auxiliary prestressed steel strand 5 are clamped by the auxiliary prestressed anchor 6, one end of which is fixed, and the other end is not fixed first, and the auxiliary prestressed steel strand 5 at the unfixed end is tensioned by a jack. After the tensioning is completed, the tensioned end of the auxiliary prestressed steel strand 5 is fixed by the auxiliary prestressed anchor 6, and then the jack is removed, and the tensioned end length of the auxiliary prestressed steel strand 5 is retained at 150 mm, so that the auxiliary prestressed steel strand 5 can be tensioned again in the future, and the prestressed duct is grouted for maintenance to form a prestressed concrete beam structure with prestressed reinforcement function.

[0045] When it is necessary to tension the secondary prestressed steel strand 5 again, the tensioning end of the secondary prestressed steel strand 5 is connected with a jack, and then the secondary prestressed anchor 6 at the tensioning end of the secondary prestressed steel strand 5 is loosened. The jack tensions the secondary prestressed steel strand 5. After completion, the tensioning end of the secondary prestressed steel strand 5 is fixed with the secondary prestressed anchor 6 again.

[0046] The above are preferred embodiments of the present application, but those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A prestressed concrete beam structure with prestressed reinforcement function, comprising a concrete beam body (1), characterized in that: The two ends of the concrete beam body (1) are respectively provided with end anchor plates (2), the inner side of the end anchor plate (2) is provided with an end cavity (21), the outer side of the end anchor plate (2) is a flat plate, the end of the concrete beam body (1) is inserted into the end cavity (21) for fixing, the main prestressed steel strand (3) is buried in the concrete beam body (1), the two ends of the main prestressed steel strand (3) pass through the concrete beam body (1), the end anchor plate (2) is provided with a main through hole (22) that passes through inside and outside, the end of the main prestressed steel strand (3) passes through the main through hole (22), the main prestressed anchor (4) is arranged on the outer side of the end anchor plate (2), and the main prestressed anchor (4) clamps and pulls the two ends of the main prestressed steel strand (3).

2. The prestressed concrete beam structure with prestressed reinforcement function according to claim 1 is characterized in that: The width of the end anchor plate (2) is greater than the width of the concrete beam body (1). The end anchor plate (2) is provided with a plurality of secondary through holes (23) which are symmetrical on the left and right. The secondary through holes (23) penetrate the end anchor plate (2) inside and outside. The ends of the secondary prestressed steel strands (5) pass through the secondary through holes (23). The secondary prestressed anchor (6) is arranged on the outside of the end anchor plate (2). The secondary prestressed anchor (6) clamps and pulls the two ends of the secondary prestressed steel strands (5). The secondary prestressed steel strands (5) are located outside the concrete beam body (1).

3. The prestressed concrete beam structure with prestressed reinforcement function according to claim 2 is characterized in that: The secondary prestressed steel strands (5) are located below the concrete beam body (1) or on the left and right sides of the concrete beam body (1).

4. The prestressed concrete beam structure with prestressed reinforcement function according to claim 3 is characterized in that: The main prestressed anchor (4) and the auxiliary prestressed anchor (6) both include a clip (41) and an anchor sleeve (42); the main prestressed steel strand (3) or the auxiliary prestressed steel strand (5) passes through the clip (41); the clip (41) can clamp and fix the main prestressed steel strand (3) or the auxiliary prestressed steel strand (5); the anchor sleeve (42) is sleeved on the outer surface of the clip (41) and is fixedly connected to the clip (41); the anchor sleeve (42) is against the outer surface of the end anchor plate (2).

5. The prestressed concrete beam structure with prestressed reinforcement function according to claim 4 is characterized in that: The main through hole (22) and the secondary through hole (23) are both composed of a narrow hole section (22a) and a wide hole section (22b); one end of the narrow hole section (22a) is connected to the end cavity (21), and the other end is connected to one end of the wide hole section (22b); the other end of the wide hole section (22b) is connected to the outer side surface of the end anchor plate (2); the diameter of the wide hole section (22b) is greater than the diameter of the anchor sleeve (42); the diameter of the narrow hole section (22a) is smaller than the diameter of the anchor sleeve (42); the depth of the wide hole section (22b) is smaller than the length of the anchor sleeve (42); the clip (41) and the anchor sleeve (42) are partially inserted into the wide hole section (22b); the anchor sleeve (42) is against the transition surface between the narrow hole section (22a) and the wide hole section (22b).

6. The prestressed concrete beam structure with prestressed reinforcement function according to claim 1 is characterized in that: The number of the main prestressed steel strands (3) is multiple, and correspondingly, the number of the main through holes (22) is also multiple.

7. The prestressed concrete beam structure with prestressed reinforcement function according to claim 6 is characterized in that: The number of the main prestressed steel strands (3) is three, and the number of the secondary prestressed steel strands (5) is two.

8. The prestressed concrete beam structure with prestressed reinforcement function according to claim 5 is characterized in that: After one end of the auxiliary prestressed steel strand (5) passes through the corresponding clamp (41), a 150 mm long steel strand is left uncut, and the 150 mm long steel strand is used for connecting the end of the auxiliary prestressed steel strand (5) with the jack.

9. The prestressed concrete beam structure with prestressed reinforcement function according to claim 1 is characterized in that: The end anchor plate (2) is a steel plate.

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