Prestressed reinforcement structure of the connection between vertical support body and base and construction method thereof

Abstract

The present invention discloses a prestressed reinforcement structure of a connection part between a vertical support body and a base and a construction method thereof. The prestressed reinforcement structure comprises herringbone prestressed tendons uniformly arranged at the bottom of the vertical support body, the herringbone prestressed tendons comprising straight segments and arc segments, the straight segments are arranged inside the vertical support body, and the arc segments extend from two opposite surfaces of the vertical support body and extend to the base respectively; the herringbone prestressed tendons are exposed in the part of the cast-in-place concrete between the vertical support body and the base to form a chamfered corner concrete structure; the construction method ensures the penetration of the herringbone prestressed tendons by reserving a channel, and adopts a template to cast the corner concrete structure with chamfers. The present invention can improve the force transmission mode of the connection part between the vertical support body and the base, effectively disperse the load of the connection part, and relieve stress concentration at the node; increase the tensile strength, bending strength and anti-tilting moment of the vertical support body; at the same time, the construction difficulty is low and the construction period is short.

Description

Technical Field

[0001] The invention relates to a prestressed reinforcement structure for a connection part between a vertical support body and a base and a construction method thereof, belonging to the technical field of reinforced concrete structures. Background Art

[0002] Liquefied natural gas (LNG) is a clean energy source with methane as the main component, which is obtained by cooling conventional natural gas to below -160°C under normal pressure and separating a large amount of polluting elements such as sulfur and phosphorus through a cryogenic liquefaction process. The low temperature causes a huge change in its storage state, compressing its volume to about 1 / 600, becoming a gas with a density of about 480kg / m 3 A colorless, odorless and non-corrosive liquid. In the LNG industry chain, safe storage is one of the key links. As the main container for storing LNG, the design and construction of large LNG storage tanks occupy an important position in the entire industry chain. Large LNG storage tanks are usually built in coastal cities, where there are more extreme weather. They are easily affected by strong winds during construction and work. The outer tank wall of the storage tank is subjected to wind loads, which produces large tensile stress and bending stress. At the same time, the internal liquefied natural gas produces an outward thrust on the inner tank wall. The internal and external forces of the wall cause the bottom to be subjected to greater forces and are prone to buckling failure. The pedestal of the LNG storage tank plays a connecting role in the structure. It is an important structural component to ensure that the load of the upper structure can be effectively transferred to the lower structure, especially at the connection with the wall. The force pattern is complex and stress concentration is prone to occur. In addition, the criticality of this part in transferring loads makes the study of its force performance and structural design more important.

[0003] At present, the reinforcement method for the connection between the outer tank wall and the pedestal of the LNG storage tank is mainly to set annular prestressed embedded parts around the pedestal and set vertical prestressed embedded parts in the wall to increase its strength. However, this method wastes materials, is costly, and does not change the force transmission method. The load of the upper structure is still transmitted to the node where the wall and the pedestal are connected through the wall, and then transmitted from the node to the pedestal plane, and finally to the lower structure. This method will cause stress concentration at the connection. Summary of the invention

[0004] The purpose of the present invention is to provide a prestressed reinforcement structure of the connection between a vertical support body and a base and a construction method thereof, so as to solve the technical problem in the related art that the connection between the vertical support body and the base is subjected to large forces under various loads and is prone to stress concentration.

[0005] The prestressed reinforcement structure of the connection part between the vertical support body and the base provided by the present invention comprises:

[0006] The herringbone prestressed tendons are evenly arranged at the bottom of the vertical support body; they include two strands of prestressed tendons, each of which includes an upper straight segment and a lower arc segment, and the arc segments of the two strands of prestressed tendons are symmetrically arranged to form a "herringbone" shaped structure; the straight segment is arranged inside the vertical support body, and the straight segments of the two strands of the prestressed tendons are connected together; the arc segments of the two strands of the prestressed tendons extend from two opposite surfaces of the vertical support body and extend to the inside of the base;

[0007] The corner concrete structure is a chamfer formed by casting concrete on the exposed part of the herringbone prestressed reinforcement between the vertical support body and the base.

[0008] Furthermore, the arc segment length of each prestressed tendon of the herringbone prestressed tendon accounts for 1 / 10 to 1 / 3 of its total length.

[0009] Furthermore, the top of the straight line segment of the herringbone prestressed tendon is tied and fixed to the internal steel bars of the vertical support body, and the bottom of the arc segment is tied and fixed to the internal steel bars of the base.

[0010] Furthermore, when the vertical support body is a wall, a plurality of groups of herringbone prestressed tendons are arranged at equal intervals in the wall.

[0011] Furthermore, when the vertical support body is a column, a plurality of groups of herringbone prestressed tendons are arranged at equal angles in the column with the arc segments.

[0012] Furthermore, the chamfer of the corner concrete structure is 30 to 45 degrees.

[0013] Furthermore, the corner concrete structures are continuously arranged at the bottom of the vertical support body.

[0014] The present invention provides a construction method for the above-mentioned prestressed reinforcement structure, comprising the following steps:

[0015] After the main reinforcements of the vertical support body and the base are tied together, reserved channels for the herringbone prestressed tendons are evenly arranged inside the main reinforcements of the vertical support body;

[0016] Reserving binding steel bars are respectively arranged in the vertical support body and the base;

[0017] Casting concrete on the vertical support body and the base respectively;

[0018] Pass the herringbone prestressed tendons through the reserved channel inside the vertical support body, tie the tops of the straight segments of the two prestressed tendons of the herringbone prestressed tendons together, and extend the arc segments of the two prestressed tendons from two opposite surfaces of the vertical support body to the base;

[0019] The top of the straight line segment of the herringbone prestressed tendons is tied to the reserved binding steel bars of the vertical support body, and the bottom of the arc segment is tied to the reserved binding steel bars of the base;

[0020] Applying prestress to the herringbone prestressed tendons by post-tensioning method to achieve a preset prestress value;

[0021] Arranging an arc-shaped template at the connection part between the vertical support body and the base, and pouring concrete on the exposed part of the herringbone prestressed tendons between the vertical support body and the base to form a chamfered corner concrete structure;

[0022] After the concrete of the vertical support body and the base is initially set, the reserved channel, the reserved binding steel bars of the vertical support body, and the gaps at the positions of the reserved binding steel bars of the base are cast for a second time;

[0023] After the concrete is cured, the formwork is removed.

[0024] The present invention has the following beneficial effects:

[0025] The prestressed reinforcement structure of the connection part between the vertical support body and the base of the present invention applies prestress in two directions through the herringbone prestressed tendons, improves the force transmission mode of the connection part between the vertical support body and the base, and directly transmits part of the upper load from the vertical support body to the base through the herringbone prestressed tendons, effectively disperses the load at the connection part, relieves stress concentration at the node, increases the tensile and bending strength of the vertical support body, strengthens the anti-tilting moment at the bottom of the vertical support body, and prevents local damage.

[0026] In addition, in the part where the herringbone prestressed bars are exposed between the vertical support body and the base, a chamfered corner concrete structure is formed by cast-in-place concrete, which not only increases the force-bearing area of ​​the connection part and disperses the upper load, but also serves as a protective layer for the herringbone prestressed bars to prevent corrosion of the steel bars, extend the service life, and enhance the stability of the bottom of the entire vertical support body.

[0027] The construction method of the prestressed reinforcement structure provided by the present invention has low construction difficulty, improves construction efficiency, saves construction period, makes the prestressed reinforcement structure simple and easy to implement, and is suitable for promotion. By reinforcing the connection between the vertical support body and the base, the performance and safety of the overall structure are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a structural schematic diagram of a prestressed reinforcement structure according to Example 1 of the present invention;

[0029] Figure 2 yes Figure 1 AA cross-section diagram.

[0030] The marks in the figure are as follows:

[0031] 1. Wall; 2. Capping platform; 3. Herringbone prestressed tendons; 4. Corner concrete structure; 5. Corrugated pipe. DETAILED DESCRIPTION

[0032] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0033] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0034] like Figure 1 and Figure 2 As shown, it is a structural schematic diagram of the prestressed reinforcement structure of the connection between the vertical support body and the base provided by the present invention, which is applied to the connection between the wall 1 and the pedestal 2 of the outer tank of the LNG storage tank. It can make the connection between the wall 1 and the pedestal 2 better disperse the load transmitted from top to bottom, improve the force transmission mode, alleviate the stress concentration phenomenon, and avoid causing local structural damage, thereby making the structure more evenly stressed, ensuring the safety and earthquake resistance of the outer tank of the LNG storage tank.

[0035] The prestressed reinforcement structure of the connection part between a vertical support body and a base in this embodiment mainly includes a herringbone prestressed tendon 3 and a corner concrete structure 4.

[0036] The herringbone prestressed tendons 3 include two identical prestressed tendons, each of which includes an upper straight segment and a lower arc segment, and the arc segments of the two prestressed tendons extend symmetrically in two opposite directions, thereby forming a herringbone structure. The length of the arc segment of each prestressed tendon usually accounts for 1 / 10 to 1 / 3 of the overall length range, which is specifically determined according to the height of the wall 1 and the stress conditions of the connection part, to ensure the effective overlap between the straight segment of the prestressed tendon and the internal steel bars of the wall 1, and the quality of the binding of the arc segment and the internal steel bars of the pedestal 2, thereby ensuring that the force transmission effect of the prestressed tendons matches the stress conditions of the connection part, and to give full play to the force transmission advantage of the herringbone prestressed tendons.

[0037] The herringbone prestressed tendons 3 are evenly arranged at the bottom of the vertical support body. In this embodiment, the vertical support body is specifically the wall 1 of the outer tank of the LNG storage tank, and the wall 1 is a cylindrical structure. Therefore, multiple groups of herringbone prestressed tendons 3 of the prestressed reinforcement structure are evenly arranged in a ring shape at equal intervals inside the wall 1.

[0038] The straight segments of each group of herringbone prestressed tendons 3 are arranged inside the wall 1 , the tops of the straight segments of the two prestressed tendons are tied together, and the arc segments of the two prestressed tendons extend from the inner and outer sides of the wall 1 respectively and extend into the pedestal 2 .

[0039] The top of the straight section of the herringbone prestressed tendon 3 is tied to the internal steel bars of the wall 1, and the bottom of the arc section is tied to the internal steel bars of the cap 2. The arrangement and overlap of the tied steel bars will affect the force transmission effect of the herringbone prestressed tendon 3. The quality of the tying is based on not affecting the working effect of the internal steel bars of the wall 1 and the cap 2, and maximizing the force transmission effect of the herringbone prestressed tendon 3.

[0040] The exposed part of the arc segment of the herringbone prestressed tendon 3 between the wall 1 and the pedestal 2 is formed into a chamfered corner concrete structure 4 by cast-in-place concrete, and the corner concrete structure 4 is arranged in a whole circle around the inner and outer sides of the bottom of the wall 1. The chamfer of the corner concrete structure 4 is generally within the range of 30 to 45 degrees, which can make the herringbone prestressed tendon 3 and the corner concrete structure 4 have a better force transmission effect and avoid stress concentration.

[0041] Through the above-mentioned prestressed reinforcement structure, the two opposite surfaces of the wall 1 apply prestress in both directions, which can effectively improve the force transmission mode at the connection between the wall 1 and the pedestal 2, directly transmit part of the upper load to the pedestal 2, disperse the load of the connection, and effectively alleviate the stress concentration at the connection node. At the same time, the herringbone prestressed reinforcement structure 3 arranged evenly in an annular manner also improves the overall stability of the wall 1, increases the tensile and bending strength of the wall 1, and strengthens the anti-tilting moment at the bottom of the wall 1 to prevent local tensile stress damage. On the basis of the herringbone prestressed tendons 3, the corner concrete structure 4 can, on the one hand, increase the force-bearing area at the corners of the connection between the wall 1 and the pedestal 2, disperse the load transmitted from top to bottom, and achieve a better force transmission effect; on the other hand, it can protect the exposed part of the herringbone prestressed tendons 3 from rust.

[0042] For large liquefied natural gas storage tanks, they are generally concrete structures with a height greater than 40 meters and a diameter greater than 20 meters. For such structures, the tank wall is required to have a relatively high strength. The configuration of the prestressed reinforcement structure of the present invention can effectively enhance the bearing capacity of the structure, better alleviate the unfavorable situation that the wall 1 is subjected to the outward thrust of the liquid natural gas inside and the environmental loads such as wind load outside, which is beneficial to the storage safety of liquefied natural gas, and ultimately prolongs the operating life of the building, ensuring that the building structure has a sufficiently stable bearing capacity during its life.

[0043] It should be noted that the application scenario of this embodiment is the outer tank of the LNG storage tank, which is used to reinforce the connection between the wall 1 and the pedestal 2. The wall 1 belongs to the vertical support body, and the pedestal 2 belongs to the base; obviously, the prestressed reinforcement structure of this embodiment can be set between the vertical support body and the base, which can improve the problem that the connection between the vertical support body and the base is subjected to large forces and prone to stress concentration under various loads. Among them, the vertical support body can include a cylindrical wall, a flat wall or a wall of other special shapes, and can also be a column of various shapes; the base can be a pedestal or other basic structure. Different specific forms of vertical support bodies and base connection parts can all have the herringbone prestressed tendons 3 of the prestressed reinforcement structure evenly arranged inside the vertical support body according to specific circumstances. The arc segments of the two prestressed tendons of the herringbone prestressed tendons 3 extend from the opposite surfaces of the vertical support body and into the base, and cast-in-place concrete is also used to form a chamfered corner concrete structure 4. The corner concrete structure 4 is generally arranged continuously along the bottom of the vertical support body, which can enhance the overall stability of the vertical support body.

[0044] The following two implementation modes are used as examples to further illustrate:

[0045] In the first embodiment, the vertical support body is a plane wall, the base is a foundation, and multiple groups of herringbone prestressed reinforcement structures are evenly arranged at equal intervals at the bottom of the plane wall. The straight segments of each group of herringbone prestressed tendons 3 are set inside the plane wall, and the tops of the straight segments of the two prestressed tendons are tied together, and the arc segments of the two prestressed tendons extend from the opposite sides of the plane wall and extend into the foundation. The top of the straight segment of the herringbone prestressed tendons 3 is tied to the steel bars inside the plane wall, and the bottom of the arc segment is tied to the steel bars inside the foundation. The arc segment of the herringbone prestressed tendons 3 exposed between the plane wall and the foundation forms a chamfered corner concrete structure 4 through cast-in-place concrete, and the corner concrete structure 4 is arranged along a straight line on both sides of the bottom of the plane wall.

[0046] In the second embodiment, the vertical support body is a square column, the base is a cap, and two groups of herringbone prestressed tendons 3 of the prestressed reinforcement structure are evenly arranged inside the square column. The straight segments of the two groups of herringbone prestressed tendons 3 are set at the center of the square column, and the tops of the straight segments of the four prestressed tendons are tied together; the two arc segments of each group of herringbone prestressed tendons 3 extend to the two opposite faces of the square column respectively, and the arc segments of the four prestressed tendons are at 90 degrees to each other, and extend from the four sides of the square column and extend into the cap. The top of the straight segment of the herringbone prestressed tendons 3 is tied to the steel bars inside the square column, and the bottom of the arc segment is tied to the steel bars inside the cap. The arc segment of the herringbone prestressed tendons 3 exposed between the square column and the cap is formed into a corner concrete structure 4 with chamfered corners by cast-in-place concrete, and the corner concrete structure 4 is arranged along the entire circle of the bottom of the square column.

[0047] According to another aspect of the present embodiment, a construction method of a prestressed reinforcement structure of a connection between a vertical support body and a base is provided, wherein a reserved channel is used to ensure that a herringbone prestressed tendon 3 passes through, and a template is used to cast a chamfered corner concrete structure 4, so that the connection between the vertical support body and the base is stronger and the construction is more convenient and rapid; the method comprises the following operations:

[0048] During the construction of the outer tank of the LNG storage tank, after the main reinforcement of the wall 1 and the pedestal 2 is tied, the prestressed reinforcement structure is constructed. Each prestressed steel bar of the herringbone prestressed steel bar 3 is a steel strand, each steel strand consists of 8 steel wires, and the size of the prestressed steel bar is consistent with the main steel bar of the wall 1.

[0049] The wall 1 of the outer tank of the LNG storage tank is generally divided into two sections along the height. The second section of the wall 1 at the bottom is thicker. Inside the steel cage of the second section of the wall 1, a plurality of three-way corrugated pipes 5 are arranged in an annular manner at equal intervals. The three-way corrugated pipes 5 are used to form a reserved channel for the herringbone prestressed tendons 3, which matches the shape and size of the herringbone prestressed tendons 3.

[0050] Set reserved binding steel bars at the top channel opening of the three-way corrugated pipe in the wall 1, and determine the length of the binding wire.

[0051] Set reserved binding steel bars at the corresponding positions of the foundation 2 and determine the length of the binding wires.

[0052] Before the formwork is supported and poured for the wall 1 and the pedestal 2, the debris in the formwork must be cleaned up. When pouring concrete, it should be carried out in sections and layers according to the drawings and construction requirements. The pouring process should be carried out continuously, and the interval time should be shortened as much as possible. The formwork, internal steel bars, reserved steel bars and three-way corrugated pipe 5 should be observed in time for movement, deformation or blockage. The internal steel bars and three-way corrugated pipe 5 must not be touched during vibration. After the concrete is poured, the concrete should be cured and covered and watered within 12 hours. The number of waterings should keep the concrete sufficiently moist.

[0053] The herringbone prestressed tendons 3 are passed through the three-way corrugated pipe reserved in the wall 1, and the straight sections of the two prestressed tendons of the herringbone prestressed tendons 3 are tied together at the top, and the arc sections of the two prestressed tendons extend from the inner and outer sides of the wall 1 respectively and extend into the pedestal 2.

[0054] The top of the straight section of the herringbone prestressed tendon 3 is tied to the reserved binding steel bars of the wall 1, and the bottom of the arc section is tied to the reserved binding steel bars of the pedestal 2; the specific binding method can be direct wire binding, embedded parts binding or anchor binding.

[0055] The herringbone prestressed tendons 3 are prestressed by post-tensioning method to ensure that the preset prestress value is reached without prestress loss, while facilitating construction.

[0056] Arc-shaped templates are arranged around the inner and outer sides of the connection between the wall 1 and the pedestal 2, and the chamfer angle of the arc-shaped template is 30-45 degrees.

[0057] Concrete is poured at the part where the herringbone prestressed tendons 3 are exposed from the wall 1 and the pedestal 2, so as to form a stable chamfered corner concrete structure 4, which is arranged in a complete ring around the wall 1.

[0058] After the initial setting of the concrete of the wall 1 and the pedestal 2, the surface is artificially roughened and deburred to remove the floating slurry or loose parts on the surface to expose the coarse aggregate of stones. Then, the concrete is cleaned and rinsed, moistened in advance, and then the gaps at the reserved positions for binding steel bars in the three-way corrugated pipe 5, the wall 1 and the pedestal 1 are poured for the second time to fill them up to enhance the bite force.

[0059] After the concrete is cured, the formwork is removed.

[0060] Through the above-mentioned construction method, the construction difficulty of the prestressed reinforcement structure can be reduced, the construction period can be saved, and the performance and safety of the connection between the vertical support body and the base can be improved as a whole.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0064] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0065] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A prestressed reinforcement structure of a connection portion between a vertical support body and a base, comprising: Herringbone prestressed tendons are evenly arranged at the bottom of the vertical support body; It comprises two strands of prestressed tendons, each strand of the prestressed tendons comprises an upper straight line segment and a lower arc segment, and the arc segments of the two strands of the prestressed tendons are symmetrically arranged to form a "human" shaped structure; the straight line segment is arranged inside the vertical support body, and the straight line segments of the two strands of the prestressed tendons are connected together; the arc segments of the two strands of the prestressed tendons extend from two opposite surfaces of the vertical support body and extend to the inside of the base; The corner concrete structure is a chamfer formed by casting concrete on the exposed part of the arc segment of the herringbone prestressed reinforcement between the vertical support body and the base.

2. The prestressed reinforcement structure of the connection between the vertical support body and the base according to claim 1 is characterized in that: The arc segment length of each prestressed tendon of the herringbone prestressed tendons accounts for 1 / 10 to 1 / 3 of the total length range.

3. The prestressed reinforcement structure of the connection between the vertical support body and the base according to claim 1 or 2, characterized in that: The top of the straight line segment of the herringbone prestressed tendon is tied and fixed to the internal steel bars of the vertical support body, and the bottom of the arc segment is tied and fixed to the internal steel bars of the base.

4. The prestressed reinforcement structure of the connection between the vertical support body and the base according to claim 1 or 2, characterized in that: When the vertical support body is a wall, a plurality of groups of the herringbone prestressed tendons are arranged at equal intervals in the wall.

5. The prestressed reinforcement structure of the connection between the vertical support body and the base according to claim 1 or 2, characterized in that: When the vertical support body is a column, a plurality of groups of the herringbone prestressed tendons are arranged at equal angles within the column with the arc segments.

6. The prestressed reinforcement structure of the connection between the vertical support body and the base according to claim 1 or 2, characterized in that: The chamfer angle of the corner concrete structure is 30-45°.

7. The prestressed reinforcement structure of the connection between the vertical support body and the base according to claim 1 or 2, characterized in that: The corner concrete structures are continuously arranged at the bottom of the vertical support body.

8. The construction method of the prestressed reinforcement structure according to any one of claims 1 to 7, comprising the following steps: After the main reinforcements of the vertical support body and the base are tied together, reserved channels for the herringbone prestressed tendons are evenly arranged inside the main reinforcements of the vertical support body; Reserving binding steel bars are respectively arranged in the vertical support body and the base; Casting concrete on the vertical support body and the base respectively; Pass the herringbone prestressed tendons through the reserved channel inside the vertical support body, tie the tops of the straight segments of the two prestressed tendons of the herringbone prestressed tendons together, and extend the arc segments of the two prestressed tendons from two opposite surfaces of the vertical support body to the inside of the base; The top of the straight line segment of the herringbone prestressed tendons is tied to the reserved binding steel bars of the vertical support body, and the bottom of the arc segment is tied to the reserved binding steel bars of the base; Applying prestress to the herringbone prestressed tendons by post-tensioning method to achieve a preset prestress value; Arranging an arc-shaped template at the connection part between the vertical support body and the base, and pouring concrete on the exposed part of the herringbone prestressed tendons between the vertical support body and the base to form a chamfered corner concrete structure; After the concrete of the vertical support body and the base is initially set, the reserved channel, the reserved binding steel bars of the vertical support body, and the gaps at the positions of the reserved binding steel bars of the base are cast for a second time; After the concrete is cured, the formwork is removed.

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