A prestressed reinforced concrete prefabricated beam

Abstract

The present invention discloses a prestressed reinforced concrete precast beam using a pre-tensioning method, which belongs to the technical field of precast beams, and comprises a beam body, and also comprises lower prestressed tendons, upper prestressed tendons, a corrugated sleeve, a suspension positioning rod, a fastening mechanism, supporting steel bars, U-shaped steel bars, a supporting positioning mechanism and a pressing positioning mechanism. The present invention places the precast beam in a casting area by suspending a supporting rod through the mutual cooperation of two corrugated sleeves, a supporting positioning mechanism, a pressing positioning mechanism and a fastening mechanism, so that the penetration holes of the prestressed tendons are coaxially distributed with the supporting grooves and the pressing grooves, respectively, to form a preliminary production of a steel skeleton, simplifying the difficulty of binding operations of the supporting steel bars and the lower prestressed tendons, and of the U-shaped steel bars and the upper prestressed tendons, effectively improving the production rate of the steel skeleton, thereby improving the processing rate of the reinforced concrete precast beam, and forming sufficient support and limit processing for the penetration of the prestressed tendons, effectively avoiding the bending of the prestressed tendons when the holes are penetrated.

Description

Technical Field

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

[0002] Reinforced concrete precast beams, that is, reinforced concrete precast beams, refer to beams that are pre-manufactured in a factory or a specific site using reinforced concrete materials; and the reinforced concrete precast beams constructed using the prestressing method are intended to improve the crack resistance of reinforced concrete components and avoid premature cracks in reinforced concrete components, and to pre-apply stress to them during the prefabrication process of concrete components to improve component performance.

[0003] The operation steps of precast reinforced concrete beams using the pre-tensioning method mainly include preparation of the tensioning pedestal, tensioning of prestressed tendons, production of steel skeletons, erection of molds, pouring of concrete, concrete curing, demoulding and relaxation of prestressed tendons, and storage and transportation of finished products. At present, when tensioning prestressed tendons, it is necessary to first lay out multiple prestressed tendons in sequence, insert the prestressed tendons from the movable pedestal, and pass them out from the beam hole on the other side. Then, a clamp is put on the prestressed tendons and locked for fatigue treatment. Subsequently, the prestressed tendons are tensioned by hydraulic jacks. The construction of prestressed tendons adopts the construction process of whole-pulling and whole-releasing. After a period of time, the steel skeleton production process was completed by tying non-prestressed tendons. However, in the actual operation process, it was found that when the prestressed tendons were inserted into the movable pedestal and passed through the beam holes for installation, they lacked corresponding support during the installation process. Since the prestressed tendons were inserted for a long length, they were prone to bending during the installation process, resulting in inaccurate positioning when passing through the beam holes, increasing the time consumption of installation. After the prestressed tendons were tensioned, the non-prestressed tendons located below the prestressed tendons were tied, and the operation difficulty was significantly increased, which greatly reduced the production rate of the steel skeleton.

[0004] Therefore, a prestressed reinforced concrete precast beam using a pre-tensioning method is needed to solve the problem that when the prestressed concrete precast beam is constructed using the pre-tensioning method in the prior art, the prestressed tendons are inconvenient to install and thread during the tensioning process, and the binding operation of non-prestressed tendons is difficult, thereby reducing the processing rate of the reinforced concrete precast beam. Summary of the invention

[0005] The object of the present invention is to provide a prestressed reinforced concrete precast beam to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a prestressed reinforced concrete prefabricated beam, comprising a beam body, and further comprising:

[0007] The lower prestressed tendons are provided with four lower prestressed tendons and are buried at the bottom of the beam body at equal intervals, and the upper prestressed tendons buried at the top of the beam body are provided at the centers above the two lower prestressed tendons close to each other;

[0008] A corrugated sleeve, wherein two corrugated sleeves are provided and each of them is respectively sleeved on the outer surface of four lower prestressed tendons and three upper prestressed tendons, and three equally spaced suspension positioning rods are fixed to the top of the corrugated sleeve, and the suspension positioning rods are fixedly passed through the top surface of the beam body and extend to the outside of the top surface of the beam body, and a fastening mechanism is fixed between the two corrugated sleeves;

[0009] Support steel bars, multiple support steel bars are arranged and evenly distributed between the two corrugated sleeves, a U-shaped steel bar is arranged above each support steel bar, a support positioning mechanism matched with the upper prestressed bar is arranged between the two U-shaped steel bars on both sides, and a pressing positioning mechanism matched with the lower prestressed bar is arranged between the other U-shaped steel bars.

[0010] It should be noted that the fastening mechanism includes:

[0011] A fixed sleeve rod, two of which are symmetrically sleeved on the outer surface of the same end of the two corrugated sleeves, both ends of the corrugated sleeves are provided with threaded sections, and the top surface of the fixed sleeve rod is provided with a fastening nut matched with the threaded section;

[0012] Connecting bars, multiple connecting bars are arranged and evenly distributed and embedded in the top inner walls of the two fixed sleeves. The tops of both ends of each supporting steel bar penetrate the fixed sleeve and are clamped in the inside of the connecting bar. The bottom end of each U-shaped steel bar penetrates the top surface of the beam body and is clamped in the inside of the connecting bar.

[0013] It is further worth noting that the support and positioning mechanism comprises:

[0014] A support plate, wherein three support plates are provided and are respectively located at the bottom of the three upper prestressed tendons, the top surface of the support plate is provided with a support groove matched with the upper prestressed tendons, the bottom surfaces of both ends of the support plate are detachably connected with T-shaped support rods, the bottom ends of the three T-shaped support rods located on the same side slide through the top surfaces of the adjacent connecting bars, and the outer surface of the T-shaped support rod is provided with a support spring fixed to the opposite surface of the T-shaped support rod and the connecting bar;

[0015] Elastic buckles, which correspond to multiple T-shaped support rods one by one and are respectively fixed to the bottom ends of adjacent T-shaped support rods. The three elastic buckles located on the same side are all buckled and arranged on the outer surfaces of adjacent supporting steel bars.

[0016] It should be further explained that the pressing and positioning mechanism includes:

[0017] A pressing plate, the pressing plate is provided with multiple pressing plates and is arranged one-to-one with multiple connecting bars not on both sides, the bottom surface of the pressing plate is provided with a pressing groove matched with the lower prestressed tendon, the top surface of each pressing plate is fixed with two symmetrically distributed pressing rods, the top end of the pressing rod slides through the adjacent connecting bars, and the outer surface of the pressing rod is provided with a pressing spring fixed to the opposite surface of the connecting bars and the pressing plate;

[0018] Docking rods, there are multiple docking rods and they are arranged one-to-one with multiple connecting bars not on both sides, the bottom end of the docking rod is fixed to the top end of two adjacent pressing rods, and the top surface of the docking rod is detachably connected to the top and bottom surfaces of the support plate.

[0019] As a preferred embodiment, guide grooves are provided on the outer surfaces of the end portions of the pressing plate, and the two ends of the supporting steel bars are respectively fitted in the two guide grooves located on the same pressing plate.

[0020] As a preferred embodiment, a plurality of evenly distributed docking sleeves are fixed to the top and bottom surfaces of the support plate, and docking columns matching with the docking sleeves are provided on the top surface of the docking rod and the top end of the T-shaped support rod.

[0021] As a preferred embodiment, support blocks are fixed to the outer surfaces of both sides of the support plate, and the top surface of the support block is provided with spiral stirrups which are sleeved on the periphery of the top surface of the upper prestressed tendons, and the spiral stirrups are buried inside the beam body.

[0022] As a preferred embodiment, an I-beam is provided between the support block located in the middle and the bottom top surface of the support plate, and the ends of the I-beam are fixedly passed through the outer surfaces of both sides of the beam body.

[0023] Compared with the prior art, the prestressed reinforced concrete prefabricated beam provided by the present invention has at least the following beneficial effects:

[0024] (1) Through the mutual cooperation of two corrugated sleeves, a support positioning mechanism, a pressing positioning mechanism and a fastening mechanism, and by placing it in the casting area through a suspended support rod, the holes for inserting the prestressed tendons are coaxially distributed with the support groove and the pressing groove, respectively, thereby forming the preliminary production of the steel skeleton, simplifying the difficulty of binding the support steel bars with the lower prestressed tendons, and the U-shaped steel bars with the upper prestressed tendons, effectively improving the production rate of the steel skeleton, and thus improving the processing rate of the reinforced concrete precast beam.

[0025] (2) Through the mutual cooperation of the corrugated sleeve, the support positioning mechanism and the pressing positioning mechanism, the corrugated sleeve and the supporting steel bars can support the bottom of the lower prestressed tendon and the pressing groove of the pressing plate can limit the top of the lower prestressed tendon. At the same time, the upper prestressed tendon is supported by the support groove on the support plate and the corrugated sleeve limits the top of the lower prestressed tendon, thereby forming sufficient support and limiting treatment for the prestressed tendon during penetration, effectively avoiding the bending of the prestressed tendon during penetration, and ensuring the stability and balance of the pulling of the upper and lower prestressed tendons during the subsequent whole pulling process.

[0026] (3) The setting of the support block can not only improve the convenience of placing the spiral stirrups, thereby facilitating the upper prestressed reinforcement to pass through the center, but also improve the convenience of installing the I-beam in the middle. The setting of the spiral stirrups can work together with the supporting steel bars and U-shaped steel bars to form an effective shear resistance system, prevent shear failure of the precast beam body, and constrain the concrete. At the same time, the continuity and tightness of the spiral stirrups can better constrain the concrete and prevent it from being dispersed and damaged, which not only improves the bearing capacity of the precast beam body, but also improves its stress performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the fastening mechanism of the present invention;

[0029] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of the middle A area;

[0030] Figure 4 It is a schematic diagram of the local structure inside the beam body of the present invention;

[0031] Figure 5 For the present invention Figure 4 Schematic diagram of the enlarged structure of the middle B area;

[0032] Figure 6 It is a partial enlarged structural schematic diagram of the support plate and the pressing plate of the present invention;

[0033] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure of the middle C area;

[0034] Figure 8 It is a schematic diagram of the partial structure of the pressing and positioning mechanism of the present invention;

[0035] Fig. 9 For the present invention Figure 8 Schematic diagram of the enlarged structure of the middle D area;

[0036] Fig.10 It is a schematic diagram of the split structure of the docking sleeve and the docking column of the present invention.

[0037] In the figure: 1. beam body; 2. lower prestressed tendons; 3. upper prestressed tendons; 4. corrugated sleeve; 5. suspension positioning rod; 6. fastening mechanism; 61. fixing sleeve rod; 62. fastening nut; 63. connecting bar; 7. supporting steel bar; 8. U-shaped steel bar; 9. supporting positioning mechanism; 91. supporting plate; 92. supporting groove; 93. T-shaped supporting rod; 94. supporting spring; 95. elastic buckle; 10. pressing positioning mechanism; 101. pressing plate; 102. pressing groove; 103. pressing rod; 104. pressing spring; 105. docking rod; 11. guide groove; 12. docking sleeve; 13. docking column; 14. support block; 15. spiral stirrup; 16. I-beam. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the embodiments.

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0040] Unless otherwise defined, the technical or scientific terms used in the present disclosure shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "including" or "comprising" and the like used in the present disclosure mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0041] Embodiment 1:

[0042] See also Figure 1-10 The present invention provides a prestressed reinforced concrete prefabricated beam, comprising a beam body 1, and lower prestressed tendons 2, wherein four lower prestressed tendons 2 are provided and are equidistantly buried at the bottom of the beam body 1, and upper prestressed tendons 3 buried at the top of the beam body 1 are provided at the upper centers of two lower prestressed tendons 2 close to each other;

[0043] It should be noted that the interior of the beam body 1 is filled with concrete during the subsequent pouring process, which is not shown in the figure. The upper prestressed tendons 3 and the lower prestressed tendons 2 can be made of steel bars or steel strands. The upper prestressed tendons 3 and the lower prestressed tendons 2 are in the state after being cut by a grinding wheel cutter at the position shown in the figure. When the upper prestressed tendons 3 and the lower prestressed tendons 2 are not cut, a clamp is provided on their outer surface, and the movable pedestal is tensioned by a hydraulic jack, thereby driving the four lower prestressed tendons 2 and the three upper prestressed tendons 3 to be tensioned and released in a whole construction process;

[0044] The corrugated sleeve 4 is provided with two corrugated sleeves 4, each of which is respectively sleeved on the outer surface of the four lower prestressed tendons 2 and the three upper prestressed tendons 3. The top of the corrugated sleeve 4 is fixed with three equally distributed suspension positioning rods 5. The suspension positioning rods 5 are all fixedly passed through the top surface of the beam body 1 and extend to the outside of the top surface of the beam body 1. A fastening mechanism 6 is fixed between the two corrugated sleeves 4;

[0045] It should be noted that the arrangement of the corrugated sleeve 4 can be suspended on the pedestal through the top end of the suspension positioning rod 5, and the fastening mechanism 6 is arranged so that the two corrugated sleeves 4 form a whole, thereby forming a support for the four lower prestressed tendons 2 to be penetrated and installed, and can also effectively reduce the excessive local prestress at the end of the beam body 1 after the subsequent pouring of concrete, thereby avoiding cracks at the end, thereby preventing cracks from occurring;

[0046] Support steel bars 7, multiple support steel bars 7 are provided and are evenly distributed between the two corrugated sleeves 4, a U-shaped steel bar 8 is provided above each support steel bar 7, a support positioning mechanism 9 matched with the upper prestressed tendon 3 is provided between the two U-shaped steel bars 8 on both sides, and a pressing positioning mechanism 10 matched with the lower prestressed tendon 2 is provided between the other U-shaped steel bars 8;

[0047] It should be noted that the support steel bar 7 and the U-shaped steel bar 8 are respectively arranged below the lower prestressed tendon 2 and above the upper prestressed tendon 3, and the support steel bar 7 and the U-shaped steel bar 8 are pre-engaged and installed on the fastening mechanism 6, thereby forming a protective treatment of the support steel bar 7 and the U-shaped steel bar 8 for the lower prestressed tendon 2 and the upper prestressed tendon 3, respectively, so as to facilitate the subsequent binding thereof into a steel bar skeleton;

[0048] The support positioning mechanism 9 and the pressing positioning mechanism 10 are pre-installed on the components of the fastening mechanism 6. First, the two corrugated sleeves 4 are fastened and installed to form a whole by the fastening mechanism 6. Then, the fastened and installed corrugated sleeves 4 are inverted, and the corrugated sleeves 4 are supported by the suspension support rods at both ends. Then, multiple support steel bars 7 are evenly snap-fitted and installed on the fastening mechanism 6 to form a preliminary positioning installation. Then, the corrugated sleeve 4 is restored to the front side, and the components in the support positioning mechanism 9 on both sides are pressed, so that the support positioning mechanism 9 and the support steel bars 7 on both sides are buckled and installed. At this time, the top surface of the component in the support positioning mechanism 9 and the corrugated sleeve 4 form a support positioning and adjustment process for the upper prestressed tendon 3;

[0049] Subsequently, the pressing and positioning mechanism 10 moves synchronously with the supporting and positioning mechanism 9, so that the components in the pressing and positioning mechanism 10 and the corrugated sleeve 4 form a pressing, positioning and adjusting process for the lower prestressed tendon 2, and then the U-shaped steel bar 8 is clamped and installed on the fastening mechanism 6, and multiple supporting steel bars 7 and multiple U-shaped steel bars 8 components form a preliminary steel bar skeleton, and then the initially installed non-prestressed steel bar skeleton is suspended and placed in the casting area through multiple suspension support rods, and aligned with the penetration holes between the upper prestressed tendon 3 and the lower prestressed tendon 2, thereby completing the installation of the supporting and positioning mechanism 9 of the upper prestressed tendon 3 and the lower prestressed tendon 2 and the preparation of the preliminary steel bar skeleton, providing effective support for the subsequent penetration of the upper prestressed tendon 3 and the lower prestressed tendon 2 to prevent them from bending during penetration, and reducing the subsequent difficulty of tying the non-prestressed steel bar skeleton below and above the upper prestressed tendon 3, effectively improving the prefabrication processing rate of reinforced concrete prefabricated beams.

[0050] Further as Figure 2 , Figure 3 , Figure 5 and Figure 7 As shown, it is worth to explain in detail that the fastening mechanism 6 includes a fixed sleeve rod 61, two fixed sleeve rods 61 are provided and symmetrically sleeved on the same end outer surface of the two corrugated sleeves 4, both ends of the corrugated sleeves 4 are provided with threaded sections, and the top surface of the fixed sleeve rod 61 is provided with a fastening nut 62 matched with the threaded section;

[0051] Connecting bars 63, which are provided with a plurality of equidistantly distributed connecting bars 63 and embedded in the top inner walls of the two fixed sleeves 61, the tops of both ends of each supporting steel bar 7 penetrate the fixed sleeve 61 and are clamped in the interior of the connecting bars 63, and the bottom ends of each U-shaped steel bar 8 penetrate the top surface of the beam body 1 and are clamped in the interior of the connecting bars 63;

[0052] It should be noted that the corrugated sleeve 4 is prepared by bending a bar, and vertical sections are provided at both ends thereof and an obtuse angle is formed at the end. When the fixed sleeve 61 is sleeved on the threaded section of the corrugated sleeve 4, the bottom limit treatment of the fixed sleeve 61 is formed by the obtuse angle.

[0053] It should be noted that, by squeezing the threads of the fastening nut 62 on the threaded section, the fixed sleeve 61 is threadedly locked to the end of the threaded sleeve, forming an integral support frame structure between the two corrugated sleeves 4 and the two fixed sleeves 61, and then a plurality of connecting rods 63 are snap-fitted into the slots of the fixed sleeves 61 to form a snap-fit ​​placement of the connecting rods 63, further enhancing the support stability of the threaded sleeve and providing convenience for the insertion and positioning of the support steel bars 7 and the U-shaped steel bars 8, thereby improving the convenience of tying the upper prestressed tendons 3 and the lower prestressed tendons 2 with the U-shaped steel bars 8 and the support steel bars 7 after tensioning.

[0054] Further as Figure 3 , Figure 4 , Figure 5 , Figure 7 and Fig. 9 As shown, it is worth specifically explaining that the support and positioning mechanism 9 includes a support plate 91, three support plates 91 are provided and are respectively located at the bottom of the three upper prestressed tendons 3, and the top surface of the support plate 91 is provided with a support groove 92 matched with the upper prestressed tendons 3, and the bottom surfaces of both ends of the support plate 91 are detachably connected with T-shaped support rods 93, and the bottom ends of the three T-shaped support rods 93 located on the same side slide through the top surfaces of the adjacent connecting bars 63, and the outer surface of the T-shaped support rod 93 is provided with a support spring 94 fixed to the opposite surface of the T-shaped support rod 93 and the connecting bar 63;

[0055] Elastic buckle rings 95, the elastic buckle rings 95 correspond to the multiple T-shaped support rods 93 one by one and are respectively fixed to the bottom ends of adjacent T-shaped support rods 93, and the three elastic buckle rings 95 located on the same side are all buckled and set on the outer surfaces of adjacent support steel bars 7;

[0056] It should be noted that the T-shaped support rod 93, the support spring 94 and the elastic buckle 95 are integrally located above the outer connecting bar 63. Due to the initial elastic force of the support spring 94, the top of the T-shaped support rod 93 is arranged away from the top surface of the connecting bar 63. In the figure, the support spring 94 is in a compressed state.

[0057] It should be noted that after the two corrugated sleeves 4 and the two fixed sleeve rods 61 are threadedly fastened and installed by the fastening nuts 62, the two connecting bars 63 with T-shaped support rods 93, support springs 94 and elastic buckles 95 are respectively snap-fitted and placed on the two side ends of the fixed sleeve rods 61 to form a snap-fit ​​placement, and the three support plates 91 are respectively assembled and installed with the T-shaped support rods 93 on both sides. By applying a downward force to the support plate 91, the combined stability between the support plate 91 and the T-shaped support rod 93 can be improved, and the support spring 94 can be compressed and the T-shaped support rod 93 and the elastic buckle strip can be synchronously moved downward until the elastic buckle strip is squeezed and buckled with the outer surface of the support steel bar 7, thereby forming a press-locking process for the support plate 91.

[0058] After the support plate 91 is pressed and locked, the support groove 92 on the support plate 91 is coaxially distributed with the insertion hole of the upper prestressed tendon 3. When the upper prestressed tendon 3 is inserted and positioned for insertion, the upper prestressed tendon 3 is inserted from the insertion hole and slides on the surface of the support groove 92 of the support plate 91, thereby forming an effective support for the upper prestressed tendon 3, and the corrugated sleeves 4 on both sides limit the top surface of the upper prestressed tendon 3, effectively avoiding bending of the upper prestressed tendon 3 during insertion.

[0059] Further as Figure 2 , Figure 6 , Figure 8 and Fig.10 As shown, it is worth specifically explaining that the pressing and positioning mechanism 10 includes a pressing plate 101, and the pressing plate 101 is provided with a plurality of connecting bars 63 which are arranged one by one with the connecting bars 63 which are not on both sides. The bottom surface of the pressing plate 101 is provided with a pressing groove 102 which matches with the lower prestressed tendon 2, and the top surface of each pressing plate 101 is fixed with two symmetrically distributed pressing bars 103, and the top end of the pressing bar 103 slides through the adjacent connecting bars 63, and the outer surface of the pressing rod 103 is provided with a pressing spring 104 which is fixed to the opposite surfaces of the connecting bars 63 and the pressing plate 101;

[0060] Docking rods 105, which are provided in plurality and correspond to the plurality of connecting bars 63 on the non-sides. The bottom end of the docking rod 105 is fixed to the top ends of the two adjacent pressing rods 103, and the top surface of the docking rod 105 is detachably connected to the top and bottom surfaces of the support plate 91;

[0061] It should be noted that the pressing plate 101, the pressing spring 104, the pressing rod 103 and the docking rod 105 are integrally arranged with the connecting bar 63. Due to the initial elastic force of the pressing spring 104, the top of the docking rod 105 is arranged away from the top surface of the connecting bar 63. In the figure, the pressing spring 104 is in a stretched state.

[0062] It should be noted that when the connecting bar 63 with the pressing plate 101, the pressing spring 104, the pressing rod 103 and the docking rod 105 is mounted on the fixed sleeve rod 61, the support plate 91 is not assembled and installed on the top of the T-shaped support rod 93. Then, the support plate 91 is placed above the T-shaped support rod 93 and the plurality of docking rods 105. By pressing the support plate 91, the support plate 91, the T-shaped support rod 93 and the plurality of docking rods 105 are all plug-in installed. When the elastic buckle 95 is buckled on the outer surface of the supporting steel bar 7, the pressing spring 104 is in a stretched state, and the pressing rod 103 drives the pressing plate 101 to be distributed downward. At this time, the pressing groove 102 is coaxially arranged with the through hole of the lower prestressed tendon 2.

[0063] After the pressing groove 102 of the pressing plate 101 is coaxially distributed with the penetration hole of the lower prestressed tendon 2, when the lower prestressed tendon 2 is penetrated through the penetration hole, its end is supported by the corrugated sleeve 4 and the supporting steel bar 7 in sequence, and is penetrated by sliding on the surface of the pressing groove 102, so as to form a bottom support for the lower prestressed tendon 2 and a top pressing positioning, further improving the accuracy of the penetration and installation of the lower prestressed tendon 2, and effectively avoiding the bending phenomenon during penetration;

[0064] It is still necessary to note that the cross-sections of the pressing plate 101 and the supporting plate 91 are both arranged in a multi-section isosceles trapezoidal combination. In addition, a vertical distribution in space is formed between the pressing plate 101 and the supporting plate 91, thereby effectively increasing the contact area and contact region of the precast beam with the pressing plate 101 and the supporting plate 91 during concrete pouring, thereby significantly improving the service strength of the precast beam.

[0065] Further as Figure 2 and Fig.10 As shown, it is worth to explain in detail that the outer surface of the end of the pressing plate 101 is provided with a guide groove 11, and the two ends of the supporting steel bar 7 are respectively fitted in the two guide grooves 11 located on the same pressing plate 101;

[0066] It should be noted that the guide groove 11 is provided to limit the support steel bars 7 on the non-sides, thereby improving the stability of the support steel bars 7 when they are plugged and installed on the connecting bar 63 to a certain extent, and facilitating the subsequent binding process with the lower prestressed tendons 2;

[0067] It should be noted that there is a certain height difference between the connecting bar 63 and the guide groove 11. At this time, when the connecting bar 63 with the pressing plate 101, the pressing spring 104, the pressing rod 103 and the docking rod 105 is engaged with the top surface of the fixed sleeve rod 61, the connecting bar 63 needs to be tilted and sent obliquely from between the two fixed sleeve rods 61 until both ends of the pressing plate 101 are located below the fixed sleeve rod 61. At this time, the connecting bar 63 is restored to be parallel to the fixed sleeve rod 61, and then pressed downward so that the connecting bar 63 is engaged and installed on the fixed sleeve rod 61.

[0068] Further as Figure 8 and Fig.10 As shown, it is worth to explain in detail that a plurality of evenly distributed docking sleeves 12 are fixed to the top and bottom surfaces of the support plate 91, and the top surface of the docking rod 105 and the top end of the T-shaped support rod 93 are both provided with docking columns 13 matched with the docking sleeves 12;

[0069] It should be noted that the arrangement of the docking column 13 and the docking sleeve 12 allows the support plate 91 to be conveniently plugged into and positioned with the T-shaped support rod 93 and the docking rod 105, and by pressing the support plate 91, the installation stability of the T-shaped support rod 93, the docking rod 105 and the support plate 91 is further improved.

[0070] The present embodiment has the following working process: when preparing for the tensioning operation of the reinforced concrete precast beam, firstly, through the action of the fastening mechanism 6, the two corrugated sleeves 4 and the two fixed sleeves 61 are threadedly locked by four fastening nuts 62, the corrugated sleeves 4 are turned over, and a plurality of supporting steel bars 7 are sequentially passed through the fixed sleeves 61, and the corrugated sleeves 4 are turned over and reset again, and the connecting bar 63 with a T-shaped supporting rod 93, a supporting spring 94 and an elastic buckle 95 is straightly lowered, and is clamped and placed on the top surface of the fixed sleeve 61 and the supporting steel bars 7 are inserted into the inside of the connecting bar 63, and then the pressing bars 93 with the pressing bars 94 and the elastic buckle 95 are sequentially inserted into the fixing sleeves 61. The connecting bar 63 of the pressing plate 101, the pressing spring 104, the pressing rod 103 and the docking rod 105 are first sent obliquely and then placed straight down, and are placed on the top surface of the fixed sleeve rod 61 and the corresponding supporting steel bar 7 is inserted into the inside of the connecting bar 63. Then, the three supporting plates 91 are aligned with the docking column 13 through the docking sleeve 12, and are assembled and installed in alignment while continuously applying downward force. At this time, the elastic buckle 95 is squeezed and buckled with the corresponding supporting steel bar 7, that is, the preliminary structure of the steel frame of the supporting positioning mechanism 9, the pressing positioning mechanism 10, the fastening mechanism 6 and the two corrugated sleeves 4 is completed;

[0071] The steel skeleton is suspended and supported by the suspension support rod and placed in the area to be poured, so that the support groove 92 on the support plate 91 is coaxially distributed with the penetration hole of the upper prestressed tendon 3 and the pressing groove 102 of the pressing plate 101 is coaxially distributed with the penetration hole of the lower prestressed tendon 2. Then, when the upper prestressed tendon 3 and the lower prestressed tendon 2 pass through the threading holes of the movable pedestal in sequence, the bottom of the lower prestressed tendon 2 is supported by the corrugated sleeve 4 and the support steel bar 7, and the top of the lower prestressed tendon 2 is limited by the pressing groove 102 of the pressing plate 101, so as to avoid the lower prestressed tendon 2 from bending during the punching. At the same time, the upper prestressed tendon 3 is supported by the support groove 92 on the support plate 91 and the corrugated sleeve 4 limits the top of the upper prestressed tendon 3, so as to avoid the upper prestressed tendon 3 from bending during the punching.

[0072] After the upper prestressed tendons 3 and the lower prestressed tendons 2 are installed and the corresponding clamps are put on, the four lower prestressed tendons 2 and the three upper prestressed tendons 3 are tensioned as a whole by an external hydraulic jack. After tensioning for a period of time, the support steel bars 7 and the lower prestressed tendons 2, and the U-shaped steel bars 8 and the prestressed tendons are tied in turn, thereby completing the steel skeleton between the prestressed tendons and the non-prestressed tendons;

[0073] After the steel frame is completed, the upper formwork is assembled on the periphery of the steel frame, and then the concrete is poured and compacted. After a period of curing, the formwork is removed, and then the tensioning effect on the upper prestressed tendons 3 and the lower prestressed tendons 2 is released by the hydraulic jack. After the tensioning is relaxed, the upper prestressed tendons 3 and the lower prestressed tendons 2 extending to the outside of the beam body 1 are symmetrically cut by a grinding wheel cutting machine, and the processing of the reinforced concrete precast beam is completed.

[0074] Embodiment 2:

[0075] Based on the first embodiment, Figure 2 , Figure 4 , Figure 6 , Fig. 9 and Fig.10 As shown, it is worth to explain in detail that support blocks 14 are fixed to the outer surfaces of both sides of the support plate 91, and the top surface of the support block 14 is provided with a spiral stirrup 15 which is sleeved on the periphery of the top surface of the upper prestressed tendon 3, and the spiral stirrup 15 is buried inside the beam body 1, and an I-shaped steel 16 is provided between the support block 14 located in the middle and the bottom top surface of the support plate 91, and the ends of the I-shaped steel 16 are fixed and penetrate the outer surfaces of both sides of the beam body 1;

[0076] It should be noted that the provision of the support block 14 can not only improve the convenience of placing the spiral stirrups 15, thereby facilitating the upper prestressed tendon 3 to pass through its center, but also improve the convenience of installing the I-beam 16 in the middle. The provision of the spiral stirrups 15 can work together with the supporting steel bars 7 and the U-shaped steel bars 8 to form an effective shear resistance system to prevent shear failure of the precast beam body 1 and constrain the concrete. At the same time, the continuity and tightness of the spiral stirrups 15 can better constrain the concrete and prevent it from being discrete and damaged, which not only improves the bearing capacity of the precast beam body 1, but also improves its force performance and service life.

[0077] In summary, in combination with the two embodiments, it can be known that: through the mutual cooperation of the two corrugated sleeves 4, the support positioning mechanism 9, the pressing positioning mechanism 10 and the fastening mechanism 6, and by placing it in the casting area through the suspension support rod, the holes for the prestressed tendons are coaxially distributed with the support groove 92 and the pressing groove 102, respectively, thereby forming the preliminary production of the steel skeleton. Compared with the subsequent binding of non-prestressed tendons, there is no need to position the non-prestressed tendons, which simplifies the difficulty of binding the support steel bars 7 and the lower prestressed tendons 2, and the U-shaped steel bars 8 and the upper prestressed tendons 3, effectively improving the production rate of the steel skeleton, thereby improving the processing rate of the reinforced concrete precast beam;

[0078] Through the mutual cooperation of the corrugated sleeve 4, the supporting positioning mechanism 9 and the pressing positioning mechanism 10, the corrugated sleeve 4 and the supporting steel bar 7 can support the bottom of the lower prestressed tendon 2 and the pressing groove 102 of the pressing plate 101 can limit its top. At the same time, the support of the upper prestressed tendon 3 by the supporting groove 92 on the support plate 91 and the limiting effect of the corrugated sleeve 4 on its top are formed, which forms sufficient support and limiting treatment for the prestressed tendons during penetration, effectively avoiding bending of the prestressed tendons during punching, and ensuring the stability and balance of the pulling of the upper prestressed tendons 3 and the lower prestressed tendons 2 during the subsequent whole pulling process.

[0079] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A prestressed reinforced concrete prefabricated beam, comprising a beam body (1), characterized in that: Also includes: Lower prestressed tendons (2), four of which are arranged and are equidistantly buried at the bottom of the beam body (1), and upper prestressed tendons (3) buried at the top of the beam body (1) are arranged at the center of the upper parts of two lower prestressed tendons (2) close to each other; A corrugated sleeve (4), wherein two corrugated sleeves (4) are provided and each of the two corrugated sleeves (4) is respectively sleeved on the outer surface of the four lower prestressed tendons (2) and the three upper prestressed tendons (3); three equally spaced suspension positioning rods (5) are fixed to the top of the corrugated sleeve (4); the suspension positioning rods (5) are all fixedly passed through the top surface of the beam body (1) and extend to the outside of the top surface of the beam body (1); and a fastening mechanism (6) is fixed between the two corrugated sleeves (4); Support steel bars (7), a plurality of support steel bars (7) are provided and are evenly distributed between the two corrugated sleeves (4), a U-shaped steel bar (8) is provided above each support steel bar (7), a support positioning mechanism (9) cooperating with the upper prestressed bar (3) is provided between the two U-shaped steel bars (8) located on both sides, and a pressing positioning mechanism (10) cooperating with the lower prestressed bar (2) is provided between the other U-shaped steel bars (8); The fastening mechanism (6) comprises: A fixed sleeve rod (61), two fixed sleeve rods (61) are provided and are symmetrically sleeved on the outer surface of the same end of the two corrugated sleeves (4), both ends of the corrugated sleeves (4) are provided with threaded sections, and the top surface of the fixed sleeve rod (61) is provided with a fastening nut (62) that matches the threaded section; A connecting bar (63), the connecting bar (63) being provided with a plurality of equidistantly distributed embedded and installed on the top inner walls of the two fixed sleeves (61), the top ends of both ends of each of the supporting steel bars (7) passing through the fixed sleeves (61) and being snap-fitted into the interior of the connecting bar (63), and the bottom end of each of the U-shaped steel bars (8) passing through the top surface of the beam body (1) and being snap-fitted into the interior of the connecting bar (63); The supporting and positioning mechanism (9) comprises: A support plate (91), wherein three support plates (91) are provided and are respectively located at the bottom of three upper prestressed tendons (3); a support groove (92) matching the upper prestressed tendons (3) is provided on the top surface of the support plate (91); the bottom surfaces of both ends of the support plate (91) are detachably connected with T-shaped support rods (93); the bottom ends of the three T-shaped support rods (93) located on the same side slide through the top surfaces of adjacent connecting bars (63); and the outer surface of the T-shaped support rod (93) is provided with a support spring (94) fixed to the opposite surface of the T-shaped support rod (93) and the connecting bar (63); The elastic buckle ring (95) corresponds to the plurality of T-shaped support rods (93) one by one and is respectively fixed to the bottom ends of adjacent T-shaped support rods (93), and the three elastic buckle rings (95) located on the same side are all buckled and arranged on the outer surfaces of adjacent support steel bars (7).

2. The prestressed reinforced concrete precast beam according to claim 1 is characterized in that: The pressing and positioning mechanism (10) comprises: A pressing plate (101), the pressing plate (101) being provided with a plurality of connecting bars (63) which are arranged one-to-one with the connecting bars (63) on the non-sides, the bottom surface of the pressing plate (101) being provided with a pressing groove (102) which matches with the lower prestressed tendon (2), the top surface of each pressing plate (101) being fixed with two symmetrically distributed pressing bars (103), the top end of the pressing bar (103) slidingly passing through the adjacent connecting bars (63), and the outer surface of the pressing bar (103) being provided with a pressing spring (104) which is fixed to the opposite surfaces of the connecting bars (63) and the pressing plate (101); A docking rod (105), wherein the docking rod (105) is provided in plurality and is arranged in one-to-one correspondence with the plurality of connecting bars (63) not on both sides, the bottom end of the docking rod (105) is fixed to the top ends of two adjacent pressing rods (103), and the top surface of the docking rod (105) is detachably connected to the top and bottom surfaces of the support plate (91).

3. The prestressed reinforced concrete precast beam according to claim 2 is characterized in that: The outer surfaces of the ends of the pressing plates (101) are provided with guide grooves (11), and the two ends of the supporting steel bars (7) are respectively fitted inside the two guide grooves (11) located on the same pressing plate (101).

4. The prestressed reinforced concrete precast beam according to claim 3 is characterized in that: A plurality of evenly distributed docking sleeves (12) are fixed to the top and bottom surfaces of the support plate (91), and docking columns (13) matching with the docking sleeves (12) are provided on the top surface of the docking rod (105) and the top end of the T-shaped support rod (93).

5. The prestressed reinforced concrete precast beam according to claim 4 is characterized in that: Support blocks (14) are fixed to the outer surfaces of both sides of the support plate (91), and the top surface of the support block (14) is provided with spiral stirrups (15) sleeved on the periphery of the top surface of the upper prestressed tendon (3), and the spiral stirrups (15) are buried inside the beam body (1).

6. The prestressed reinforced concrete precast beam according to claim 5, characterized in that: An I-shaped steel (16) is arranged between the support block (14) located in the middle and the bottom top surface of the support plate (91), and the ends of the I-shaped steel (16) are fixedly passed through the outer surfaces of both sides of the beam body (1).

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