Prestressed reinforced concrete beam and construction method thereof

Abstract

The present invention belongs to the technical field of prestressed reinforced concrete beams, and specifically relates to a prestressed reinforced concrete beam and a construction method thereof, comprising a concrete body and a reinforced concrete steel frame erected in the concrete body; corrugated pipes are erected on both sides of the reinforced concrete steel frame, and at least two groups of tensioning structures are installed at the bottom of the reinforced concrete steel frame; the tensioning structure comprises a horizontally arranged tensile steel bar and an elastic curved steel bar arranged in an arch shape, and a locking member is sleeved on the outer sides of the two tensile steel bars and the two ends of the elastic curved steel bar; multiple groups of the tensioning structures are assembled and welded through multiple connecting rod steel bars, and installed at the bottom of the reinforced concrete steel frame, and the two ends of the elastic curved steel bar are contracted to fit the two ends of the tensile steel bar, and the locking member is installed. The present invention can realize the observation of the actual effect of prestressing tensioning, and can improve the strength of the beam.

Description

Technical Field

[0001] The invention belongs to the technical field of prestressed reinforced concrete beams, and in particular relates to a prestressed reinforced concrete beam and a construction method thereof. Background Art

[0002] Prestressed reinforced concrete beams are an engineering structure that is pre-tensioned on steel bars and applied with high-strength concrete to improve the tensile strength and overall performance of the structure. In modern construction projects and bridge construction, prestressed reinforced concrete beams are widely used due to their excellent structural performance and economic benefits. This beam structure applies tension to the steel bars in advance and then pours concrete, using the resilience of the steel bars to exert pressure on the concrete, thereby significantly improving the bending resistance, crack resistance and stiffness of the beam, which not only extends the service life of the structure but also reduces maintenance costs.

[0003] Problems with existing technologies:

[0004] However, for existing prestressed reinforced concrete beams, there is a discrepancy between the tensioning parameters and the actual tensioning effect, and there is no intuitive reference. Especially for hollow beams, the strength of the beam will be seriously affected due to the poor tensioning effect. Summary of the invention

[0005] The object of the present invention is to provide a prestressed reinforced concrete beam and a construction method thereof, which can realize the observation of the actual effect of prestressing tensioning and can improve the strength of the beam.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A prestressed reinforced concrete beam comprises a concrete body and a reinforced concrete steel frame erected in the concrete body;

[0008] The reinforced concrete steel frame has corrugated pipes on both sides thereof, and at least two sets of tensioning structures installed at the bottom of the reinforced concrete steel frame;

[0009] The tension structure includes a horizontally arranged tensile steel bar and an arched elastic curved steel bar, and locking components are sleeved on the outer sides of the two ends of the tensile steel bar and the elastic curved steel bar;

[0010] A plurality of groups of the tensioning structures are assembled and welded through a plurality of connecting rod steel bars, and are installed at the bottom of the reinforced concrete steel frame, and the two ends of the elastic curved steel bars are contracted to fit with the two ends of the tensile steel bars, and locking components are installed.

[0011] The reinforced concrete steel frame includes a plurality of sets of skeleton steel bars and a plurality of ring steel bars arranged alternately. An annular inner ring steel bar is also arranged inside the reinforced concrete steel frame. The inner ring steel bar is connected to the skeleton steel bar through connecting steel bars.

[0012] A plurality of corrugated pipes are erected on the top of a plurality of connecting steel bars.

[0013] The two ends of the tensile steel bar and the elastic curved steel bar are buckled to form a column.

[0014] At least one locking member is provided at each end of the tensioning structure, and the locking member includes a sleeve ring and an extrusion ring. The extrusion ring is interference-fitted on the inner side of one end of the sleeve ring, and the inner side of the extrusion ring clamps the outer side of the tensile steel bar and the elastic curved steel bar, so that the tensile steel bar and the elastic curved steel bar fit tightly.

[0015] A protrusion is arranged on the inner side of the extrusion ring.

[0016] The first sub-beam steel bar frames are provided on both sides of the top of the reinforced concrete steel frame, the first sub-beam steel bar frames include a plurality of first sub-beam steel bars tied with the skeleton steel bars, a connecting ring steel bar is sleeved in the middle of the first sub-beam steel bar, the first sub-beam steel bar is provided with a first bending portion sleeved on the top of the skeleton steel bar, and a first sleeve portion sleeved on another skeleton steel bar, the end of the top of the first sub-beam steel bar is inserted into the bottom side of another skeleton steel bar.

[0017] Second sub-beam steel bar frames are provided on both sides of the bottom of the reinforced concrete steel frame, and the second sub-beam steel bar frames include multiple second sub-beam steel bars tied with the skeleton steel bars, a connecting ring steel bar is sleeved in the middle of the second sub-beam steel bar, the second sub-beam steel bar is provided with a second bent portion sleeved on the top of the skeleton steel bar, and a second sleeve portion sleeved on another skeleton steel bar, and the end of the bottom of the second sub-beam steel bar is inserted into one side of the bottom of another skeleton steel bar.

[0018] A construction method for a prestressed reinforced concrete beam comprises the following steps:

[0019] S1: Set up brackets and formwork for supporting and pouring reinforced concrete steel frames, install through-hole formwork inside reinforced concrete steel frames, and provide support;

[0020] S2: Tie the skeleton steel bars and the ring steel bars, prefabricate the tension structure, and wrap the diaphragm around the two ends of the tension structure and the middle of the tension steel bars. Tie the tension structure to the bottom of the reinforced concrete steel frame inside the tied skeleton steel bars and the ring steel bars, tie the skeleton steel bars and the inner ring steel bars so that the positions of the inner ring steel bars correspond to the ring steel bars, and set the tie connection steel bars between the inner ring steel bars and the ring steel bars.

[0021] S3: According to the design drawings, determine the installation height, position and number of corrugated pipes, and adapt the installation and adjust the height of the connecting steel bars;

[0022] S4: Install the corrugated pipe and insert the prestressed steel bars, set an overflow pipe on one side of the top of the corrugated pipe, and install spiral bars and anchor pads at both ends of the connecting steel bars. Then, sleeve multiple locking components at the ends of the tensioning structure, adjust the arch of the elastic curved steel bars to increase the tensile strength of the tensile steel bars, and then tighten the locking components and mark the fitting position between the tensile steel bars and the elastic curved steel bars;

[0023] S5: Check the sealing formwork and support stability, then pour concrete and maintain;

[0024] S6: Install working anchor plates and clips at both ends of the corrugated pipe, and use limit plates and jacks to achieve prestressing;

[0025] S7: Loosen the locking member, observe the fitting position between the tensile steel bars and the elastic curved steel bars at both ends of the tension structure to determine the prestressing effect, and squeeze the two ends of the elastic curved steel bars toward the middle, then install the locking member close to the two ends of the reinforced concrete steel frame, so that the extrusion ring is tightly squeezed inside the tightening ring, so that the clamped tensile steel bars and the elastic curved steel bars fit closely together;

[0026] S8: After the tensioning is completed, the tensioning equipment is dismantled and the excess steel bars are cut off;

[0027] S9: Grouting and anchor sealing.

[0028] The technical effects achieved by the present invention are:

[0029] The present invention is used to improve the installation stability between the tensile steel bars and the elastic curved steel bars by setting a locking member, and further improve the installation position stability between the tensile steel bars and the elastic curved steel bars by increasing the number of installed locking members, thereby improving the overall supporting effect of the tensioning structure on the reinforced concrete steel frame, thereby improving the overall strength of the reinforced concrete steel frame.

[0030] The present invention can observe the actual effect of prestressing by observing the relative displacement distance of the marks between the tensile steel bars and the elastic curved steel bars, and can make the top of the elastic curved steel bars fit more closely with the top of the reinforced concrete steel frame by applying inward extrusion pressure at both ends of the elastic curved steel bars, and can support the bottom of the reinforced concrete steel frame through the extrusion adaptation between the tensile steel bars and the elastic curved steel bars, thereby improving the supporting strength of the reinforced concrete steel frame. In addition, the tensile steel bars and the elastic curved steel bars have a certain elasticity, and can achieve a certain degree of elastic support capacity for the reinforced concrete steel frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0032] Figure 2is an end view of the first embodiment of the present invention;

[0033] Figure 3 It is a structural schematic diagram of Embodiment 2 of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the first secondary beam reinforcement in the present invention;

[0035] Figure 5 is an end view of the second embodiment of the present invention;

[0036] Figure 6 It is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0037] Figure 7 The present invention Figure 3 A magnified view of the structure at center A;

[0038] Figure 8 The present invention Figure 6 A magnified view of the structure at B in the middle;

[0039] Fig. 9 It is a schematic diagram of the structure of the second secondary beam reinforcement in the present invention;

[0040] Fig.10 is an end view of the third embodiment of the present invention;

[0041] Fig.11 It is a structural schematic diagram of the tension structure in the present invention;

[0042] Fig.12 The present invention Fig.11 A magnified view of the structure at C in the middle;

[0043] Fig.13 It is a structural schematic diagram of the sleeve ring and the extrusion ring in the present invention;

[0044] Fig.14 It is a structural schematic diagram of Embodiment 6 of the present invention;

[0045] Fig.15 It is a structural diagram of Embodiment 7 of the present invention.

[0046] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0047] 1. Reinforced concrete steel frame; 11. Skeleton steel bars; 12. Ring steel bars; 13. Connecting steel bars; 14. Inner ring steel bars;

[0048] 2. Bellows;

[0049] 3. Tension structure; 31. Tensile steel bar; 32. Elastic curved steel bar; 33. Connecting rod steel bar; 34. Ring; 35. Extrusion ring; 351. Annular protrusion; 352. Threaded protrusion;

[0050] 4. Locking member;

[0051] 5. First secondary beam reinforcement frame; 51. First secondary beam reinforcement; 52. Connecting ring reinforcement; 53. First sleeve connection portion; 54. First bending portion;

[0052] 6. Second sub-beam reinforcement frame; 61. Second sub-beam reinforcement; 62. Second bending portion; 63. Second sleeve connection portion. DETAILED DESCRIPTION

[0053] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0054] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of the above terms are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0055] Embodiment 1:

[0056] like Figure 1 and Figure 2 As shown, a prestressed reinforced concrete beam comprises a concrete body and a reinforced concrete steel frame 1 erected in the concrete body, corrugated pipes 2 are erected on both sides of the reinforced concrete steel frame 1, and at least two sets of tensioning structures 3 are installed at the bottom of the reinforced concrete steel frame 1.

[0057] Furthermore, the reinforced concrete steel frame 1 includes a plurality of sets of skeleton steel bars 11 and a plurality of ring steel bars 12 arranged alternately, and an annular inner ring steel bar 14 is also arranged inside the reinforced concrete steel frame 1 , and the inner ring steel bar 14 is connected to the skeleton steel bar 11 through the connecting steel bar 13 .

[0058] Among them, the connection method and installation method between the skeleton steel bars 11, the ring steel bars 12 and the connecting steel bars 13 inside the reinforced concrete steel frame 1 include but are not limited to connection by wire tying or welding. In addition, when installing the corrugated pipe 2, multiple corrugated pipes 2 are erected on the top of multiple connecting steel bars 13, and the support of the corrugated pipe 2 is achieved by increasing or adjusting the installation position of the connecting steel bars 13.

[0059] According to the above structure, inside the reinforced concrete steel frame 1 set by the tensioning structure 3, when the reinforced concrete steel frame 1 is not poured with concrete, the tensioning structure 3 can further support the flatness of the reinforced concrete steel frame 1 to avoid the middle part of the reinforced concrete steel frame 1 being subjected to gravity and bending caused by pouring concrete. In addition, after the pouring of concrete is completed, the tensioning structure 3 can support the bottom of the reinforced concrete steel frame 1 to avoid tearing at the bottom of the concrete beam during the prestressed stretching and downward bending of the reinforced concrete steel frame 1 and the concrete beam, thereby improving the strength of the concrete beam. By setting up multiple sets of tensioning structures 3, the toughness of the concrete beam can also be improved.

[0060] Embodiment 2:

[0061] Please refer to Figure 3-Figure 7 A first sub-beam steel bar frame 5 is provided on both sides of the top of the reinforced concrete steel frame 1. The first sub-beam steel bar frame 5 includes a plurality of first sub-beam steel bars 51 tied with the skeleton steel bars 11. A connecting ring steel bar 52 is sleeved in the middle of the first sub-beam steel bar 51. The first sub-beam steel bar 51 is provided with a first bending portion 54 sleeved on the top of the skeleton steel bar 11, and a first sleeve portion 53 sleeved on another skeleton steel bar 11. The end of the top of the first sub-beam steel bar 51 is inserted into the bottom side of the other skeleton steel bar 11.

[0062] According to the above structure, the installation principle of the first auxiliary beam reinforcement frame 5 is:

[0063] By sleeve-joining the first sleeve portion 53 at one end of a plurality of first sub-beam steel bars 51 onto the skeleton steel bar 11, and buckling the first bent portion 54 at the other end onto another skeleton steel bar 11, the first sub-beam steel bars 51 are positioned, and the ends of the first sub-beam steel bars 51 are inserted into the bottom of another skeleton steel bar 11 to position the first sub-beam steel bars 51, and fixed installation of a plurality of groups of first sub-beam steel bars 51 is achieved through a plurality of skeleton steel bars 11.

[0064] Furthermore, by setting up the first sub-beam steel bar frame 5, the strength of the reinforced concrete steel frame 1 can be improved, and since the first sub-beam steel bar frame 5 is arranged on both sides of the top of the reinforced concrete steel frame 1, the top support surface of the reinforced concrete steel frame 1 can be increased, and the corrugated tube 2 and the tensioning steel bars inside it are located on both sides of the reinforced concrete steel frame 1. During the tensioning process, auxiliary tensioning of the first sub-beam steel bar frames 5 on both sides can be achieved.

[0065] Furthermore, when the tops of the first sub-beam steel bars 5 on both sides are subjected to stress, an outward pulling force will be applied to the reinforced concrete steel frame 1 between the first sub-beam steel bars 5 on both sides, and applied to the middle part of the reinforced concrete steel frame 1 through the bottom side of the first sub-beam steel bars 5, thereby preventing the first sub-beam steel bars 5 from collapsing under stress.

[0066] Embodiment three:

[0067] Please refer to Figure 6 and Figure 8-Figure 10 A second sub-beam steel bar frame 6 is provided on both sides of the bottom of the reinforced concrete steel frame 1. The second sub-beam steel bar frame 6 includes a plurality of second sub-beam steel bars 61 tied with the skeleton steel bars 11. A connecting ring steel bar 52 is sleeved in the middle of the second sub-beam steel bar 61. The second sub-beam steel bar 61 is provided with a second bent portion 62 sleeved on the top of the skeleton steel bar 11, and a second sleeve portion 63 sleeved on another skeleton steel bar 11. The end of the bottom of the second sub-beam steel bar 61 is inserted into one side of the bottom of the other skeleton steel bar 11.

[0068] The principles of this embodiment are basically the same as those of the second embodiment, except that this embodiment is suitable for installation on a building with a larger supporting surface, or on the top of a concrete support column with supporting buildings on both sides, such as in frozen soil areas for bridges, which have special requirements for support columns.

[0069] Furthermore, the second sub-beam steel bar 61 is sleeved on the top of the skeleton steel bar 11 through the second bending portion 62, and is sleeved on the other skeleton steel bar 11 through the second sleeve portion 63, and one end of the second sub-beam steel bar 61 is inserted into the bottom of the other skeleton steel bar 11, thereby realizing installation. When the second sub-beam steel bar frames 6 on both sides are subjected to downward pressure from the reinforced concrete steel frame 1, the force transfer can be realized by stretching the bottom of the reinforced concrete steel frame 1 by the second sub-beam steel bar frames 6 on both sides, and by squeezing the middle parts of both sides of the reinforced concrete steel frame 1. The tensioning structure 3 is set up, through the connecting rod steel bars 33 between multiple groups of tensioning structures 3, in cooperation with the ring steel bars 12, to further support the lateral force at the bottom of the reinforced concrete steel frame 1, and when the bottoms of the reinforced concrete steel frame 1 and the second sub-beam steel bar frames 6 are supported, the overall supporting capacity of the reinforced concrete steel frame 1 can be improved.

[0070] Embodiment 4:

[0071] Please refer to Fig.11 and Fig.12 The tension structure 3 includes a horizontally arranged tensile steel bar 31 and an arched elastic curved steel bar 32. Locking components 4 are sleeved on the outer sides of the two ends of the tensile steel bars 31 and the elastic curved steel bars 32.

[0072] Furthermore, the installation method is to assemble and weld multiple groups of tension structures 3 through multiple connecting rod steel bars 33, and install them at the bottom of the reinforced concrete steel frame 1, shrink the two ends of the elastic curved steel bars 32 and the two ends of the tensile steel bars 31 to fit together, and install the locking member 4.

[0073] In addition, at the ends of the tension structure 3 for installing the locking member 4, the ends of the tension steel bar 31 and the elastic curved steel bar 32 are buckled together to form a column, which includes a cylinder or a prism with side edges.

[0074] Furthermore, at least one locking member 4 is respectively provided at both ends of the tensioning structure 3, and the locking member 4 includes a ring 34 and an extrusion ring 35. The extrusion ring 35 is interference-fitted on the inner side of one end of the ring 34, and the inner side of the extrusion ring 35 clamps the outer side of the tensile steel bar 31 and the elastic curved steel bar 32, so that the tensile steel bar 31 and the elastic curved steel bar 32 fit tightly.

[0075] When there are at least one locking member 4 at both ends of the tension structure 3, the installation condition is that after one locking member 4 is positioned, the number of installed locking members 4 is increased to improve the installation stability between the tensile steel bars 31 and the elastic curved steel bars 32, and the number of installed locking members 4 is increased to further improve the installation position stability between the tensile steel bars 31 and the elastic curved steel bars 32, thereby improving the overall supporting effect of the tension structure 3 on the reinforced concrete steel frame 1, thereby improving the overall strength of the reinforced concrete steel frame 1.

[0076] When observing the tensioning effect of the reinforced concrete steel frame 1 through the corrugated tube 2 and the tensioning steel bars inside it, after tensioning, the locking member 4 is removed, and the relative displacement distance of the marks between the tensile steel bar 31 and the elastic curved steel bar 32 can be observed, so that the actual effect of prestressing tensioning can be observed, and by applying inward extrusion pressure at both ends of the elastic curved steel bar 32, the top of the elastic curved steel bar 32 is made to fit more closely with the top of the reinforced concrete steel frame 1, and through the extrusion adaptation between the tensile steel bar 31 and the elastic curved steel bar 32, the support for the bottom of the reinforced concrete steel frame 1 is achieved, thereby improving the support strength of the reinforced concrete steel frame 1. In addition, the tensile steel bar 31 and the elastic curved steel bar 32 have a certain elasticity, which can achieve a certain degree of elastic support capacity for the reinforced concrete steel frame 1.

[0077] Embodiment five:

[0078] Please refer to Fig.12 and Fig.13 Through the friction between the tensile steel bar 31 and the elastic curved steel bar 32 on the inner side of the extrusion ring 35, the extrusion ring 35 is retracted into the trumpet-shaped interior of the sleeve ring 34, thereby realizing the extrusion installation of the tensile steel bar 31 and the elastic curved steel bar 32 by the extrusion ring 35.

[0079] Furthermore, a protrusion is provided on the inner side of the extrusion ring 35 .

[0080] Embodiment six:

[0081] Please refer to Figure 12-14 An annular protrusion 351 is provided inside the extrusion ring 35 , and the annular protrusion 351 increases the friction force on the outer sides of the tensile steel bars 31 and the elastic curved steel bars 32 , thereby improving the stability of the tensile steel bars 31 and the elastic curved steel bars 32 .

[0082] Embodiment seven:

[0083] Please refer to Fig.12 , Fig.13 and Fig.15 A circular array of threaded protrusions 352 are provided inside the extrusion ring 35. The threaded protrusions 352 increase the friction between the outer sides of the tensile steel bar 31 and the elastic curved steel bar 32. The threaded protrusions 352 can also prevent the tensile steel bar 31 and the elastic curved steel bar 32 from generating torsional force.

[0084] Embodiment eight:

[0085] Similar to the sixth and seventh embodiments, by adding strip protrusions in a ring array or point protrusions parallel to the extension direction of the tensile steel bars 31 and the elastic curved steel bars 32, the friction between the extrusion ring 35 and the outer sides of the tensile steel bars 31 and the elastic curved steel bars 32 can be achieved.

[0086] A construction method for a prestressed reinforced concrete beam comprises the following steps:

[0087] S1: Setting up a support and formwork for supporting and pouring the reinforced concrete steel frame 1, installing a through-hole formwork inside the reinforced concrete steel frame 1, and providing support;

[0088] S2: Tie the skeleton steel bars 11 and the ring steel bars 12, prefabricate the tension structure 3, and wrap the diaphragm around the two ends of the tension structure 3 and the middle of the tensile steel bars 31, tie the tension structure 3 to the bottom of the reinforced concrete steel frame 1 inside the tied skeleton steel bars 11 and the ring steel bars 12, tie the skeleton steel bars 11 and the inner ring steel bars 14 so that the positions of the inner ring steel bars 14 and the ring steel bars 12 correspond, and set the tied connecting steel bars 13 between the inner ring steel bars 14 and the ring steel bars 12;

[0089] S3: According to the design drawings, determine the installation height, position and number of the corrugated pipe 2, and adapt the installation and adjust the height of the connecting steel bars 13;

[0090] S4: Install the corrugated pipe 2 and insert the prestressed steel bars, set an overflow pipe on one side of the top of the corrugated pipe 2, and install spiral bars and anchor pads at both ends of the connecting steel bars 13. Then, sleeve multiple locking components 4 at the end of the tensioning structure 3, and adjust the arch curvature of the elastic curved steel bar 32 to increase the tensile strength of the tensile steel bar 31. Then, tighten the locking components 4 and mark the fitting position between the tensile steel bar 31 and the elastic curved steel bar 32.

[0091] S5: Check the sealing formwork and support stability, then pour concrete and maintain;

[0092] S6: Install working anchor plates and clips at both ends of the corrugated pipe 2, and use limit plates and jacks to achieve prestressing;

[0093] S7: Loosen the locking member 4, observe the fitting position between the tensile steel bars 31 and the elastic curved steel bars 32 at both ends of the tension structure 3, to determine the prestressing effect, and squeeze the two ends of the elastic curved steel bars 32 toward the middle, then install the locking member 4 to the position close to the two ends of the reinforced concrete steel frame 1, so that the squeezing ring 35 is tightly squeezed inside the tightening ring 34, so that the clamped tensile steel bars 31 and the elastic curved steel bars 32 fit closely together;

[0094] S8: After the tensioning is completed, the tensioning equipment is dismantled and the excess steel bars are cut off;

[0095] S9: Grouting and anchor sealing.

[0096] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A prestressed reinforced concrete beam, characterized in that: include: Concrete structures and reinforced concrete steel frames erected in the concrete structures (1); The reinforced concrete steel frame (1) has corrugated pipes (2) arranged on both sides thereof, and at least two sets of tensioning structures (3) installed at the bottom of the reinforced concrete steel frame (1); The tension structure (3) comprises a horizontally arranged tensile steel bar (31) and an elastic curved steel bar (32) arranged in an arch shape, and locking components (4) are sleeved on the outer sides of both ends of the two tensile steel bars (31) and the elastic curved steel bars (32); Assembling and welding a plurality of groups of the tension structures (3) through a plurality of connecting rod steel bars (33), and installing them at the bottom of the reinforced concrete steel frame (1), shrinking the two ends of the elastic curved steel bars (32) and the two ends of the tensile steel bars (31) to fit together, and installing the locking components (4); The reinforced concrete steel frame (1) is provided with first sub-beam steel bar frames (5) on both sides of the top, the first sub-beam steel bar frames (5) comprising a plurality of first sub-beam steel bars (51) tied to the skeleton steel bars (11), a connecting ring steel bar (52) sleeved on the middle of the first sub-beam steel bar (51), the first sub-beam steel bar (51) being provided with a first bent portion (54) sleeved on the top of the skeleton steel bar (11), and a first sleeve portion (53) sleeved on another skeleton steel bar (11), the end portion of the top of the first sub-beam steel bar (51) being inserted into the bottom side of another skeleton steel bar (11).

2. A prestressed reinforced concrete beam according to claim 1, characterized in that: The reinforced concrete steel frame (1) comprises a plurality of groups of skeleton steel bars (11) and a plurality of ring steel bars (12) arranged in an alternating manner. An annular inner ring steel bar (14) is also provided inside the reinforced concrete steel frame (1). The inner ring steel bar (14) is connected to the skeleton steel bar (11) via a connecting steel bar (13).

3. The prestressed reinforced concrete beam according to claim 1, characterized in that: The plurality of corrugated pipes (2) are mounted on top of the plurality of connecting steel bars (13).

4. The prestressed reinforced concrete beam according to claim 1, characterized in that: The tension steel bar (31) and the elastic curved steel bar (32) are buckled at both ends to form a column.

5. The prestressed reinforced concrete beam according to claim 1, characterized in that: At least one locking member (4) is provided at each end of the tension structure (3), the locking member (4) comprising a sleeve ring (34) and an extrusion ring (35), the extrusion ring (35) being inserted into the inner side of one end of the sleeve ring (34) by interference fit, the inner side of the extrusion ring (35) clamping the outer sides of the tensile steel bar (31) and the elastic curved steel bar (32), so that the tensile steel bar (31) and the elastic curved steel bar (32) are tightly fitted.

6. A prestressed reinforced concrete beam according to claim 5, characterized in that: A protrusion is provided on the inner side of the extrusion ring (35).

7. A construction method for a prestressed reinforced concrete beam, using the prestressed reinforced concrete beam according to any one of claims 1 to 6, characterized in that: The steps include: S1: Setting up a support and formwork for supporting and pouring the reinforced concrete steel frame (1), installing a through-hole formwork inside the reinforced concrete steel frame (1), and providing support; S2: tying the skeleton steel bars (11) and the ring steel bars (12), prefabricating the tension structure (3), and winding the diaphragm around the two ends of the tension structure (3) and the middle of the tensile steel bars (31), tying the tension structure (3) to the bottom of the reinforced concrete steel frame (1) inside the tied skeleton steel bars (11) and the ring steel bars (12), tying the skeleton steel bars (11) and the inner ring steel bars (14) so ​​that the positions of the inner ring steel bars (14) and the ring steel bars (12) correspond, and arranging the tying connection steel bars (13) between the inner ring steel bars (14) and the ring steel bars (12); S3: According to the design drawings, determine the installation height, position and number of the corrugated pipe (2), and install and adjust the height of the connecting steel bars (13); S4: installing the corrugated pipe (2) and inserting the prestressed steel bars, and setting an overflow pipe on one side of the top of the corrugated pipe (2), and installing spiral bars and anchor pads at both ends of the connecting steel bars (13), and then sleeve a plurality of locking components (4) on the end of the tension structure (3), and by adjusting the arch curvature of the elastic curved steel bars (32) to increase the tensile strength of the tensile steel bars (31), and then tightening the locking components (4), and marking the fitting position between the tensile steel bars (31) and the elastic curved steel bars (32); S5: Check the sealing formwork and support stability, then pour concrete and maintain; S6: Install working anchor plates and clips at both ends of the corrugated pipe (2), and use limit plates and jacks to achieve prestressing; S7: Loosen the locking member (4), observe the fitting position between the tension steel bars (31) and the elastic curved steel bars (32) at both ends of the tension structure (3), so as to determine the prestressing effect, and squeeze the two ends of the elastic curved steel bars (32) toward the middle, and then install the locking member (4) to a position close to the two ends of the reinforced concrete steel frame (1), so that the squeezing ring (35) is tightly squeezed inside the tightening ring (34), so that the fitting surface of the clamped tension steel bars (31) and the elastic curved steel bars (32) are tightly fitted; S8: After the tensioning is completed, the tensioning equipment is dismantled and the excess steel bars are cut off; S9: Grouting and anchor sealing.

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