Vertical prestressed member, construction system and construction method

Abstract

An embodiment of the present application provides a vertical prestressed member, a construction system and a construction method. This vertical prestressed member includes a prestressed tendon, an anchor backing plate and a tensioning member. The anchor backing plate includes a top beam anchor backing plate and a bottom beam anchor backing plate. Both ends of the prestressed tendon are respectively fixed to the top beam anchor backing plate and the bottom beam anchor backing plate through fixing members, and the prestressed tendon is arranged vertically; one end of the tensioning member is connected to the anchor backing plate, and the other end is connected to a bridge construction device. The bridge construction device applies a tensile force to the prestressed tendon by pulling the tensioning member and the anchor backing plate. Compared with the prior art, the technical solution of the present application has the advantages of safety, reliability, low cost, high prestress efficiency, etc.

Description

Technical Field

[0001] This application relates to the technical field of bridge engineering, and particularly relates to a vertical prestressed member, a construction system, and a construction method applied to the construction of concrete continuous beams. Background Art

[0002] Concrete continuous beams have the advantages of strong spanning ability, reasonable structural stress, low investment, short construction period, and mature technology. They are the preferred type of bridges when crossing various obstacles and are widely used in bridge engineering in various fields such as railways, highways, municipal engineering, and rail transit.

[0003] Web diagonal cracks are the most common and serious safety hazards faced by concrete continuous beams. To improve the shear resistance of the web's inclined section, vertical prestressed steel bundles are usually arranged at the web position in the design. Currently, prestressed high-strength deformed bars are mostly used for the vertical prestress of concrete continuous beams, and the post-tensioning method is adopted for construction. In actual construction, there are factors such as difficult-to-guarantee post-tensioning grouting quality, poor ductility of deformed bars, and difficulty in controlling the installation verticality. There have been many accidents of vertical prestressed tendons in China. For example, the vertical prestressed deformed bars on the Beijing-Harbin High-Speed Railway broke and protruded from the box girder partition, affecting train operation safety; a vertical prestressed tendon fracture accident occurred during the construction of the Suzhou-Jiaxing-Hangzhou Expressway. At the same time, considering that it is difficult to guarantee the effectiveness of vertical prestressed steel bars, the specifications reduce the effect of vertical prestressed steel bars, further reducing the economy of vertical prestressed steel bars.

[0004] It can be seen from the above examples that there are problems such as easy brittle fracture and non-dense pressure drop in the current vertical prestress system of concrete continuous beams. The existence of these problems is directly related to the high-strength deformed bar material used for vertical prestress and the post-tensioning prestress construction technology in the prior art.

[0005] On the one hand, poor ductility and difficulty in controlling the installation verticality are the material characteristics of high-strength deformed bars, and it is difficult to solve the problems by optimizing or improving the material itself. On the other hand, when the post-tensioning prestress construction technology is adopted, due to the uneven construction level, there will inevitably be non-dense pressure drop phenomena to varying degrees. When the material characteristics of high-strength deformed bars are combined with the post-tensioning prestress construction technology, the failure probability of vertical prestress is further increased, resulting in a higher safety risk for the structure. Summary of the Invention

[0006] To solve one of the above technical defects, a vertical prestressed member, a construction system, and a construction method applied to the construction of concrete continuous beams are provided in the embodiments of this application.

[0007] According to the first aspect of the embodiments of the present application, a vertical prestressed member applied to the construction of a continuous concrete beam is provided, including: a prestressed tendon, an anchor plate, and a tensioning member. The anchor plate includes a top beam anchor plate and a bottom beam anchor plate. Both ends of the prestressed tendon are respectively fixed to the top beam anchor plate and the bottom beam anchor plate through fixing members, and the prestressed tendon is vertically arranged; one end of the tensioning member is connected to the anchor plate, and the other end is connected to a bridge construction device. The bridge construction device applies a tensile force to the prestressed tendon by pulling the tensioning member and the anchor plate.

[0008] According to the second aspect of the embodiments of the present application, a vertical prestressed construction system is provided, which includes the vertical prestressed member as described above, the upper cross beam of a bridge construction machine, the lower cross beam of a bridge construction machine, the vertical support member of a bridge construction machine, a bottom formwork, and an end formwork. The vertical prestressed member is vertically arranged. The upper cross beam of the bridge construction machine is located above the top beam anchor plate, and the lower cross beam of the bridge construction machine is located below the bottom beam anchor plate. The upper cross beam of the bridge construction machine and the lower cross beam of the bridge construction machine are respectively connected to the top beam anchor plate and the bottom beam anchor plate through tensioning members; the vertical support member of the bridge construction machine is vertically arranged and its two ends are respectively connected to the upper cross beam of the bridge construction machine and the lower cross beam of the bridge construction machine; the upper cross beam of the bridge construction machine, the lower cross beam of the bridge construction machine, and the vertical support member of the bridge construction machine together form the reaction seat of the vertical prestressed construction system; the bottom formwork is located between the bottom beam anchor plate and the lower cross beam of the bridge construction machine, and the end formwork is vertically arranged at the end of the pouring area.

[0009] According to the third aspect of the embodiments of the present application, a vertical prestressed construction method using the vertical prestressed construction system as described above is provided, which includes the following steps:

[0010] Determine the working length of the prestressed tendon according to the height of the beam segment, cut the material, and mark in advance in combination with the size of the fixing member;

[0011] At the construction site, use a small extrusion anchor to anchor one end of the prestressed tendon to the bottom beam anchor plate through a fixing member;

[0012] Position the bridge construction machine, and move the upper and lower cross beams of the bridge construction machine to the predetermined positions;

[0013] Position the bottom formwork and the end formwork;

[0014] Install the bottom beam anchor plate with the prestressed tendon fixed to a predetermined position above the lower cross beam of the bridge construction machine, and insert spiral steel bars;

[0015] Install the top beam anchor plate, and anchor the other end of the prestressed tendon to the top beam anchor plate through a fixing member;

[0016] Install tensioning members between the upper cross beam of the bridge construction machine and the top beam anchor plate, and between the lower cross beam of the bridge construction machine and the bottom beam anchor plate respectively;

[0017] The step of applying tension to the tension member on the top of the upper cross beam of the bridge erector until a predetermined tonnage is reached and then fastening it;

[0018] The step of pouring the concrete of the beam segment into the pouring area;

[0019] The step of removing the tension member.

[0020] Adopting a pre-tensioning vertical prestressed member, a construction system and a construction method provided in the embodiments of the present application for the construction of a concrete continuous beam, compared with the existing post-tensioning high-strength deformed bar vertical prestressed system and construction method, the technical solution of the present application has the advantages of safety, reliability, low cost, high prestress efficiency, etc., which are mainly reflected as follows:

[0021] (1) Adopting the pre-tensioning prestressed construction process, the vertical prestress is firmly combined with the concrete beam, and the safety risk is greatly reduced compared with the existing technology.

[0022] (2) The vertical prestress uses high-strength prestressed tendons to replace high-strength deformed bars, which has significant advantages in terms of strength, ductility, etc. compared with the existing technology, and can effectively reduce costs.

[0023] (3) The vertical prestress adopts a scheme of being fixed and anchored at both ends on the anchor plate, avoiding the prestress loss caused by the deformation of the anchor, and further improving the utilization efficiency of the prestressed tendon. Brief Description of the Drawings

[0024] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0025] Figure 1 It is a schematic structural diagram of the vertical prestressed member and the construction system provided by the embodiments of the present application;

[0026] Figure 2 It is a top view of the anchor plate provided by one of the embodiments of the present application;

[0027] Figure 3 It is a top view of the anchor plate provided by another embodiment of the present application;

[0028] Figure 4 It is a schematic flow chart of the pre-tensioning vertical prestressed construction method provided by the embodiments of the present application;

[0029] Figure 5 It is a partial enlarged view after the installation of the prestressed tendon and the spiral steel bar is completed.

[0030] Reference Signs:

[0031] 1 - Prestressed tendon; 2 - Anchor backing plate; 21 - Anchor backing plate on beam top; 22 - Anchor backing plate on beam bottom; 23 - Internal threaded hole; 24 - Prestressed tendon hole; 3 - Extrusion sleeve; 4 - Screw rod; 5 - Nut; 6 - Spiral steel bar; 7 - Upper cross beam of bridge erector; 8 - Lower cross beam of bridge erector; 9 - Vertical support member of bridge erector; 10 - Bottom formwork; 11 - End formwork; 12 - Pouring area. Detailed implementation manners

[0032] In order to make the technical solutions and advantages in the embodiments of the present application clearer and more understandable, the following further elaborates on the exemplary embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0033] In the process of implementing the present application, the inventors found that in the prior art, vertical prestress for continuous concrete beams mostly uses prestressed high-strength deformed bars with post-tensioning construction. However, in actual construction, there are factors such as difficult guarantee of post-tensioning grouting quality, poor ductility of deformed bars, and difficulty in controlling the installation verticality. There have been multiple accidents of vertical prestressing tendons in China. The existing problems of easy brittle fracture and non-dense grouting in the vertical prestress system of continuous concrete beams are directly related to the high-strength deformed bar material used for vertical prestress and the post-tensioning prestress construction process. Therefore, in order to solve the safety, effectiveness, and economy of the existing vertical prestress of continuous concrete beams, improvements or innovations should be made in terms of both materials and construction processes.

[0034] In view of the above problems, the embodiments of the present application provide a vertical prestress member applied to the construction of continuous concrete beams, as well as a vertical prestress construction system and construction method using such a member.

[0035] In the embodiments of the present application, the longitudinal direction of the bridge to be built is the longitudinal bridge direction, the width direction of the bridge is the transverse bridge direction, and the direction perpendicular to the bridge deck is the vertical direction. It should be noted that since the technical solutions of the present application are implemented during the construction process of pouring continuous concrete beams, all embodiments of the present application are specifically described in terms of their structures in the construction state.

[0036] Figure 1 Structural schematic diagrams of the vertical prestress member and construction system provided for the embodiments of the present application, as shown in Figure 1As shown in the figure, a vertical prestressed member applied to the construction of a continuous concrete beam, a prestressed tendon 1, an anchor plate 2, and a tension member. The anchor plate 2 includes a top beam anchor plate 21 and a bottom beam anchor plate 22. The top beam anchor plate 21 is located above the bottom beam anchor plate 22 in the vertical direction. Both ends of the prestressed tendon 1 are respectively fixed to the top beam anchor plate 21 and the bottom beam anchor plate 22 through fixing members, and the prestressed tendon 1 is vertically arranged. One end of the tension member is connected to the anchor plate 2, and the other end is connected to the bridge construction equipment. The bridge construction equipment applies a tensile force to the prestressed tendon 1 by pulling the tension member and the anchor plate 2 to generate prestress. The prestressed tendon 1 is made of high-strength materials. At present, for cost-saving considerations, a prestressed tendon 1 can be woven from multiple high-strength steel strand bundles or high-strength steel wire bundles. The prestressed tendon 1 is subjected to stress relief treatment (stabilization treatment). Since the continuous concrete beam mainly bears compressive stress during service, a tensile stress is applied to the prestressed tendon during construction. The cast continuous beam member already contains tensile stress. When the continuous beam bears compressive stress during service, the compressive stress and the tensile stress can cancel each other out, increasing the reliability of the continuous beam member, improving the rigidity of the continuous beam member itself, and reducing vibration and elastic deformation. This can significantly improve the elastic strength of the tensile continuous beam member and make its original resistance stronger.

[0037] Using high-strength steel strand bundles or high-strength steel wire bundles to replace the high-strength deformed steel bars, the high-strength steel strand bundles or high-strength steel wire bundles have significant advantages over high-strength deformed steel bars in terms of strength, ductility, etc., and can effectively reduce costs. In addition, the vertical prestress adopts a scheme of fixed anchoring at both ends on the anchor plate, avoiding the prestress loss caused by the deformation of the anchor, and further improving the utilization efficiency of the prestressed tendon.

[0038] Furthermore, when the prestressed tendon 1 is a high-strength steel strand bundle, its two ends are connected to the anchor plate 2 through extrusion sleeves 3 during the construction state; when the prestressed tendon 1 is a high-strength steel wire bundle, its two ends are connected to the anchor plate 2 through upset heads during the construction state.

[0039] The embodiment of the present application provides a specific implementation manner of the anchor plate 2. The difference between the top beam anchor plate 21 and the bottom beam anchor plate 22 lies in their installation positions during construction, and their structures are the same. Figure 2 and Figure 3 respectively represent two different structural ways of the anchor plate 2. As Figure 2 shown, an internal threaded hole 23 for connecting with the tension member is provided in the middle of the anchor plate 2. Further, on the anchor plate 2, two prestressed tendon holes 24 for the prestressed tendon 1 to pass through are symmetrically provided on both sides of the internal threaded hole 23.

[0040] As Figure 3On the shown anchor plate 2, there are four prestressed tendon holes 24 for the prestressed tendons 1 to pass through. The four prestressed tendon holes 24 are arranged in a rectangle, and the internal thread hole 23 is located in the middle of the rectangle formed by the four prestressed tendon holes 24.

[0041] In practical applications, using Figure 2 the shown anchor plate can connect two prestressed tendons and is suitable for application scenarios with low strength requirements, which can minimize costs; using Figure 3 the shown anchor plate can connect four prestressed tendons and is suitable for application scenarios with higher strength requirements. Of course, if there are application scenarios with even higher prestress strength requirements, the number of prestressed tendon holes can be increased. It should be noted that no matter how many prestressed tendon holes are increased, the prestressed tendon holes need to be symmetrically arranged with the internal thread hole as the center to maintain force balance.

[0042] In some embodiments of the present application, the tensioning member applied to the above-mentioned anchor plate 2 is a screw rod 4. During construction, one end of the screw rod 4 is connected to the internal thread hole 23 on the anchor plate 2, and the other end passes through the upper crossbeam of the bridge-building machine, a nut 5 is screwed on, and then it is tensioned to a predetermined tonnage through a tensioning device such as a jack and the nut is tightened for fixation.

[0043] Furthermore, the prestressed tendon 1 is provided with spiral steel bars 6 in the vertical direction, and both ends of the spiral steel bars 6 are respectively connected to the anchor plate 2. Arranging spiral steel bars along the direction of the prestressed tendon is to prevent damage caused by the concrete vibrator touching the prestressed tendon during operation. Figure 5 is a partial enlarged view after the installation of the prestressed tendon and the spiral steel bar. As Figure 5 shown, the spiral steel bar 6 is a spiral structure similar to a spiral spring, and the prestressed tendon 1 is coaxial with the longitudinal central axis of the spiral steel bar 6 and longitudinally passes through the spiral steel bar 6.

[0044] The embodiments of the present application also provide a specific implementation manner of a vertical prestress construction system. As Figure 1 shown, the construction system includes the above-mentioned vertical prestress component, the upper crossbeam 7 of the bridge-building machine, the lower crossbeam 8 of the bridge-building machine, the vertical support component 9 of the bridge-building machine, the bottom formwork 10 and the end formwork 11. Among them, the vertical prestress component is vertically arranged, the upper crossbeam 7 of the bridge-building machine is located above the beam top anchor plate 21, the lower crossbeam 8 of the bridge-building machine is located below the beam bottom anchor plate 22, and the upper crossbeam 7 and the lower crossbeam 8 of the bridge-building machine are respectively connected to the beam top anchor plate 21 and the beam bottom anchor plate 22 through tensioning members.

[0045] In certain specific embodiments, the tensioning member adopts a screw rod 4, and there are at least two groups of screw rods 4. One end of one group of screw rods 4 is connected to the beam top anchor plate 21 through an internal thread hole, and the other end is connected to the upper crossbeam 7 of the bridge-building machine; one end of the other group of screw rods 4 is connected to the beam bottom anchor plate 22 through an internal thread hole, and the other end is connected to the lower crossbeam 8 of the bridge-building machine.

[0046] The vertical support member 9 of the bridge erector is vertically arranged and its two ends are respectively connected to the upper cross beam 7 and the lower cross beam 8 of the bridge erector; the upper cross beam 7, the lower cross beam 8 and the vertical support member 9 of the bridge erector jointly form the reaction seat of the pre-tensioning vertical prestress construction system; the bottom formwork 10 is located between the beam bottom anchor plate 22 and the lower cross beam 8 of the bridge erector, and the end formwork 11 is vertically arranged at the end of the pouring area.

[0047] This construction system is gradually erected during the construction process. Figure 4 It is a schematic flow chart of the pre-tensioning vertical prestress construction method provided by the embodiment of the present application. As Figure 4 shown, the specific steps are as follows:

[0048] The steps of determining the working length of the prestressing tendon according to the beam segment height, cutting the material, and making marks in advance in combination with the dimensions of the fixing parts;

[0049] The step of anchoring one end of the prestressing tendon on the beam bottom anchor plate through a fixing part by means of a small extrusion anchor at the construction site, for example, fixing one end of the prestressing steel strand on the beam bottom anchor plate through an extrusion sleeve;

[0050] The step of positioning the bridge erector and moving the upper and lower cross beams of the bridge erector to the predetermined positions;

[0051] The step of positioning the bottom formwork and the end formwork, setting the bottom formwork between the beam bottom anchor plate and the lower cross beam of the bridge erector, and vertically arranging the end formwork at the end of the pouring area;

[0052] The step of installing the beam bottom anchor plate with the prestressing tendon fixed thereon to a predetermined position above the lower cross beam of the bridge erector and inserting the spiral steel bar;

[0053] The step of installing the beam top anchor plate and anchoring the other end of the prestressing tendon on the beam top anchor plate through a fixing part, for example, fixing the other end of the prestressing steel strand on the beam bottom anchor plate through an extrusion sleeve;

[0054] The step of installing tensioning members between the upper cross beam of the bridge erector and the beam top anchor plate, and between the lower cross beam of the bridge erector and the beam bottom anchor plate respectively;

[0055] For example, passing the screw rod 4 through the reserved through hole on the upper cross beam 7 of the bridge erector, connecting it to the beam top anchor plate 21 through the internal thread hole 23 on the beam top anchor plate 21, and then screwing a nut 5 on the screw rod part extending above the upper cross beam 7 of the bridge erector, and passing the screw rod 4 through the reserved through hole on the lower cross beam 8 of the bridge erector, connecting it to the beam bottom anchor plate 22 through the internal thread hole 23 on the beam top anchor plate 21, and then screwing a nut 5 on the screw rod part extending below the lower cross beam 8 of the bridge erector for fixing;

[0056] The step of applying tension to the tension member on the top of the upper crossbeam of the bridge erector until a predetermined tonnage is reached and then fastening it. For example, on the top of the upper crossbeam 7 of the bridge erector, the screw rod 4 is tensioned by a jack, so that the prestressed tendon 1 is tensioned through the beam top anchor backing plate 21 to the predetermined tonnage, and then the nut 5 is tightened for fixation;

[0057] The step of pouring the beam section concrete into the pouring area 12;

[0058] The step of loosening the nut 5 and removing the screw rod 4 after the concrete solidifies to the desired state;

[0059] The bridge erector moves forward and repeats the above steps.

[0060] The pretensioning method is to tension the prestressed tendons before pouring the concrete, and temporarily anchor the tensioned prestressed tendons on the pedestal or steel formwork, and then pour the concrete. After the concrete is cured to reach not less than 95% of the designed strength value of the concrete, ensuring that there is sufficient bond between the prestressed tendons and the concrete, the prestressed tendons are relaxed, and the prestress is applied to the concrete by means of the bond between the concrete and the prestressed tendons. Compared with the post-tensioning construction process, the vertical prestress and the concrete beam are firmly combined, and the safety risk is greatly reduced.

[0061] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0062] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "plural" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] Although the preferred embodiments of this application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments as well as all changes and modifications that fall within the scope of this application.

[0065] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

1. A vertical prestress construction system, characterized in that: The construction system includes vertical prestressed components, the upper crossbeam (7) of the bridge building machine, the lower crossbeam (8) of the bridge building machine, the vertical support components (9) of the bridge building machine, the bottom formwork (10), and the end formwork (11). The vertical prestressed components include: prestressed tendons (1), anchor backing plates (2), and tensioning members. Among them, the anchor backing plate (2) includes a top beam anchor backing plate (21) and a bottom beam anchor backing plate (22). The two ends of the prestressed tendon (1) are respectively fixed on the top beam anchor backing plate (21) and the bottom beam anchor backing plate (22) through fixing members, and the prestressed tendon (1) is vertically arranged; one end of the tensioning member is connected to the anchor backing plate (2), and the other end is connected to the bridge building equipment. The bridge building equipment applies tension to the prestressed tendon by pulling the tensioning member and the anchor backing plate (2). The vertical prestressed components are vertically arranged. The upper crossbeam (7) of the bridge building machine is located above the top beam anchor backing plate (21), and the lower crossbeam (8) of the bridge building machine is located below the bottom beam anchor backing plate (22). The upper crossbeam (7) and the lower crossbeam (8) of the bridge building machine are respectively connected to the top beam anchor backing plate (21) and the bottom beam anchor backing plate (22) through tensioning members; the vertical support components (9) of the bridge building machine are vertically arranged and its two ends are respectively connected to the upper crossbeam (7) and the lower crossbeam (8) of the bridge building machine; the upper crossbeam (7), the lower crossbeam (8), and the vertical support components (9) of the bridge building machine jointly form the reaction seat of the vertical prestressed construction system; the bottom formwork (10) is located between the bottom beam anchor backing plate (22) and the lower crossbeam (8) of the bridge building machine, and the end formwork (11) is vertically arranged at the end of the pouring area. The prestressed tendon (1) is provided with spiral steel bars (6) along the vertical direction, and the two ends of the spiral steel bars (6) are respectively connected to the anchor backing plate (2).

2. The vertical prestress construction system according to claim 1, characterized in that The prestressed tendon (1) adopts a steel strand bundle.

3. The vertical prestress construction system according to claim 1, characterized in that The prestressed tendon (1) adopts a steel wire bundle.

4. The vertical prestress construction system according to claim 2, characterized in that: The two ends of the steel strand bundle are respectively connected to the anchor backing plate (2) through extrusion sleeves (3).

5. The vertical prestress construction system according to claim 3, characterized in that: The two ends of the steel wire bundle are respectively connected to the anchor backing plate (2) through upset heads.

6. The vertical prestress construction system according to claim 1, characterized in that: An internal threaded hole (23) for connecting with the tensioning member is opened in the middle of the anchor backing plate (2).

7. The vertical prestress construction system according to claim 6, characterized in that: The tensioning member is a screw rod (4).

8. The vertical prestress construction system according to claim 7, characterized in that: On the anchor backing plate (2), two prestressed tendon holes (24) for the prestressed tendon (1) to pass through are symmetrically opened on both sides of the internal threaded hole (23).

9. The vertical prestress construction system according to claim 7, characterized in that: On the anchor backing plate (2), four prestressed tendon holes (24) for the prestressed tendon (1) to pass through are opened, and the four prestressed tendon holes (24) are arranged in a rectangle, and the internal threaded hole (23) is located in the middle of the rectangle formed by the four prestressed tendon holes (24).

10. A vertical prestress construction method, characterized in that: The construction method uses the vertical prestressed construction system according to any one of claims 1-9, and it includes the following steps: Determining the working length of the prestressed tendon according to the height of the beam segment, cutting the material, and making marks in advance in combination with the size of the fixing member. Anchoring one end of the prestressed tendon on the bottom beam anchor backing plate through a fixing member by using a small extrusion anchor at the construction site. Positioning the bridge building machine, and moving the upper and lower crossbeams of the bridge building machine to the predetermined positions. Positioning the bottom formwork and the end formwork. The step of installing the beam bottom anchor plate with the prestressed tendon fixed thereto above the lower cross beam of the bridge building machine and inserting the spiral steel bar; The step of installing the beam top anchor plate and anchoring the other end of the prestressed tendon to the beam top anchor plate through the fixing member; The step of installing the tension members respectively between the upper cross beam of the bridge building machine and the beam top anchor plate, and between the lower cross beam of the bridge building machine and the beam bottom anchor plate; The step of applying tension to the tension members on the top of the upper cross beam of the bridge building machine until the predetermined tonnage and then tightening; The step of pouring the beam segment concrete into the pouring area; The step of removing the tension members.

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