Combined bridge tower structure and construction method thereof

Abstract

The invention relates to a combined bridge tower structure and a construction method thereof, and the combined bridge tower structure comprises outer wall steel plates which define a mounting cavity; the UHPC permanent formwork is located in the installation cavity, a bridge tower cavity is defined by the UHPC permanent formwork, a pouring cavity is defined by the outer wall steel plate and the UHPC permanent formwork in a matched mode, a supporting net is installed in the UHPC permanent formwork, a plurality of first reinforcing pieces are fixed to the UHPC permanent formwork at intervals, one end of each first reinforcing piece is fixed to the supporting net, and the other end of each first reinforcing piece extends into the pouring cavity. Each first reinforcing piece extends in the direction perpendicular to the plate face of the UHPC permanent formwork. And the steel reinforcement framework is located in the pouring cavity, and the first reinforcing piece extends into the steel reinforcement framework. The UHPC permanent formwork serves as an inner plate of the bridge tower structure, and the supporting net is installed in the UHPC permanent formwork, so that the UHPC permanent formwork low in manufacturing cost can have enough supporting performance.

Description

Technical Field

[0001] The present application relates to the technical field of bridge engineering, and in particular to a combined bridge tower structure and a construction method thereof. Background Art

[0002] Bridge towers are key structures for transferring loads and providing stiffness in cable-supported bridges. With the development of social economy and the increasing demand for interconnection, people have put forward higher and higher requirements for the construction of transportation infrastructure. As the span of bridges continues to increase, the reinforcement ratio and cross-sectional size of traditional concrete structure bridge towers and steel structure bridge towers have increased exponentially, resulting in excessively high overall costs. They are no longer suitable for large-span cable-supported bridges.

[0003] In the related technology, hollow inner and outer wall steel plates-concrete composite bridge towers are used to solve the size limitation problem of traditional concrete structure bridge towers and steel structure bridge towers. However, in the actual construction process, after exploration, it is found that the inner wall steel plate in the hollow inner and outer wall steel plates-concrete composite bridge tower mainly plays the role of a template, and the efficiency of improving the structural force is lower than that of the outer wall steel plate. Therefore, in order to simplify the structure of the hollow inner and outer wall steel plates-concrete composite bridge tower and reduce the construction cost, it is usually chosen not to set the inner wall steel plate, and only set up temporary templates inside, which are removed after the concrete reaches the design strength. However, the temporary steel template inside the outer wall steel plate-concrete composite bridge tower is difficult to remove on site, which is time-consuming and labor-intensive, with a low turnover rate, and some irregular steel templates can only be used once, resulting in a waste of resources. Summary of the invention

[0004] The present application provides a combined bridge tower structure and construction method, which can solve the technical problems in the related art that the temporary steel formwork inside the outer wall steel plate-concrete combined bridge tower is difficult to remove on site, time-consuming and labor-intensive, has a low turnover rate, and some irregular steel formworks can only be used once, resulting in a waste of resources.

[0005] In a first aspect, an embodiment of the present application provides a combined bridge tower structure, comprising: an outer wall steel plate, the outer wall steel plate enclosing an installation cavity; a UHPC permanent formwork, the UHPC permanent formwork being located in the installation cavity and the UHPC permanent formwork enclosing a bridge tower cavity, the outer wall steel plate and the UHPC permanent formwork cooperating to enclose a casting cavity, a support mesh being installed in the UHPC permanent formwork, a plurality of first reinforcement members being fixed at intervals on the UHPC permanent formwork, one end of each of the first reinforcement members being fixed to the support mesh, and the other end of each of the first reinforcement members extending into the casting cavity, and each of the first reinforcement members extending in a direction perpendicular to the plate surface of the UHPC permanent formwork; a steel bar skeleton, the steel bar skeleton being located in the casting cavity, and the first reinforcement members extending into the steel bar skeleton.

[0006] In combination with the first aspect, in one embodiment, a plurality of longitudinal stiffening ribs are fixed at intervals on the outer side of the outer wall steel plate, and a plurality of transverse stiffening ribs are fixed at intervals between two adjacent longitudinal stiffening ribs; a plurality of second stiffeners are also fixed on the inner side of the outer wall steel plate, each of the second stiffeners extends in a direction perpendicular to the plate surface of the outer wall steel plate, and each of the second stiffeners extends into the steel skeleton.

[0007] In combination with the first aspect, in one embodiment, the peripheral sides of the UHPC permanent formwork are provided with snap-fit ​​sections, and two adjacent UHPC permanent formworks are connected via the snap-fit ​​sections.

[0008] In combination with the first aspect, in one embodiment, the locking section includes a concave section and a convex section connected to the concave section, the concave section is connected to the UHPC permanent formwork, and the convex section is fixed to a side of the concave section away from the UHPC permanent formwork, wherein the concave section of one of the UHPC permanent formworks is locked in the convex section of the other UHPC permanent formwork.

[0009] In combination with the first aspect, in one embodiment, a roughened surface is provided on one side of two adjacent engaging sections that are in contact with each other.

[0010] In combination with the first aspect, in one embodiment, the steel bar skeleton includes a plurality of vertical steel bars arranged at intervals, a plurality of stirrups are provided around the plurality of vertical steel bars, the plurality of stirrups are arranged at intervals along the extension direction of the vertical steel bars, and an inverted U-shaped steel bar is fixed to the top surface of at least some of the stirrups.

[0011] In the second aspect, an embodiment of the present application provides a construction method for the above-mentioned combined bridge tower structure, which includes the following steps: surrounding the outer wall steel plate around the outer periphery of the steel frame, so that the outer wall steel plate forms an installation cavity; installing the UHPC permanent formwork to the side of the steel frame away from the outer wall steel plate, so that the UHPC permanent formwork forms a bridge tower cavity, and extending the first reinforcement into the steel frame; pouring concrete into the casting cavity to form a segment of the bridge tower; completing the construction of the next segment according to the above steps until the bridge tower is topped off.

[0012] In combination with the second aspect, in one embodiment, the steel skeleton includes a plurality of vertical steel bars and stirrups arranged around the periphery of the plurality of vertical steel bars, and the top surfaces of some of the stirrups are fixed with inverted U-shaped steel bars, and the pouring of concrete into the casting cavity includes: pouring concrete to the middle of the inverted U-shaped steel bars, and making the top surface of the concrete lower than the top surface of the UHPC permanent formwork, and the top surface of the concrete lower than the top surface of the outer wall steel plate.

[0013] In combination with the second aspect, in one embodiment, the UHPC permanent formwork is fixed with a snap-fit ​​section on the surrounding side, and two adjacent UHPC permanent formworks are connected by the snap-fit ​​section. After pouring concrete to the middle of the inverted U-shaped steel bar and making the top surface of the concrete lower than the top surface of the UHPC permanent formwork, the method includes: hoisting and fixing the steel bar skeleton of the next section to the top of the steel bar skeleton of the previous section, and continuing to splice the outer wall steel plate of the next section on the top surface of the outer wall steel plate of the previous section; splicing the next section of the UHPC permanent formwork on the top surface of the UHPC permanent formwork of the previous section, and bonding the snap-fit ​​sections of the two adjacent UHPC permanent formworks with epoxy adhesive; and pouring concrete into the casting cavity of the next section.

[0014] In combination with the second aspect, in one embodiment, before the UHPC permanent formwork is installed to the side of the splicing frame away from the outer wall steel plate, it includes: pre-embedding a support mesh in the UHPC permanent formwork, and fixing a plurality of first reinforcement members on the support mesh.

[0015] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0016] By using the UHPC permanent formwork as the inner plate of the bridge tower structure and installing a supporting net inside the UHPC permanent formwork, the low-cost UHPC permanent formwork can have sufficient supporting performance, and the first reinforcement fixed to the UHPC permanent formwork extends into the steel skeleton. When the concrete is poured, the first reinforcement is also embedded in the internal structure of the concrete and is more conveniently fixed to the concrete, which solves the technical problems in the related art that the temporary steel formwork inside the outer wall steel plate-concrete composite bridge tower is difficult to dismantle on site, time-consuming and labor-intensive, has a low turnover rate, and causes waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the main structure of the bridge tower;

[0019] Figure 2 A schematic diagram of a top view of a combined bridge tower structure provided in an embodiment of the present application;

[0020] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0021] Figure 4A schematic diagram of the three-dimensional structure of the combined bridge tower structure provided in an embodiment of the present application;

[0022] Figure 5 A cross-sectional view of a UHPC permanent formwork provided in an embodiment of the present application;

[0023] Figure 6 A flowchart of the construction method provided in an embodiment of the present application.

[0024] In the figure:

[0025] 1. Outer wall steel plate; 11. Longitudinal stiffening ribs; 12. Transverse stiffening ribs; 13. Second reinforcement member;

[0026] 2. UHPC permanent formwork; 21. support mesh; 22. first reinforcement member; 23. snap-fit ​​section; 231. concave section; 232. convex section;

[0027] 3. Steel bar skeleton; 31. Vertical steel bars; 32. Stirrups; 33. Inverted U-shaped steel bars; 34. Transverse short bars;

[0028] 4. Concrete;

[0029] 5. Bridge tower. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The embodiment of the present application provides a combined bridge tower structure, which can solve the technical problems in the related art that the temporary steel formwork inside the outer wall steel plate-concrete combined bridge tower is difficult to dismantle on site, is time-consuming and labor-intensive, has a low turnover rate, and some irregular steel formworks can only be used once, resulting in a waste of resources.

[0032] See also Figure 1 and Figure 4As shown, a combined bridge tower structure provided by an embodiment of the present application may include: an outer wall steel plate 1, the outer wall steel plate 1 enclosing an installation cavity; a UHPC (Ultra-High Performance Concrete) permanent formwork, the UHPC permanent formwork 2 is located in the installation cavity, and the UHPC permanent formwork 2 encloses a bridge tower cavity, the outer wall steel plate 1 and the UHPC permanent formwork 2 cooperate to enclose a casting cavity, a support mesh 21 is installed in the UHPC permanent formwork 2, and a plurality of first reinforcement members 22 are fixed to the UHPC permanent formwork 2 at intervals, one end of the first reinforcement members 22 is fixed to the support mesh 21, and the other end extends into the casting cavity, and each of the first reinforcement members 22 extends in a direction perpendicular to the plate surface of the UHPC permanent formwork 2; a steel skeleton 3, the steel skeleton 3 is located in the casting cavity, and the first reinforcement members 22 extend into the steel skeleton 3. The first reinforcement member 22 can be configured as a stud, or other connecting members that can connect the poured concrete 4 to the UHPC permanent formwork 2, such as bolts and shear nails. The bridge tower cavity surrounded by the UHPC permanent formwork 2 also forms the internal hollow structure of the outer wall steel plate-concrete composite bridge tower.

[0033] In the embodiment of the present application, the UHPC permanent formwork 2 is used as the inner plate of the bridge tower 5 structure, and the support mesh 21 is installed in the UHPC permanent formwork 2, so that the UHPC permanent formwork 2 with a low cost can have sufficient support performance. Preferably, the strength grade of UHPC is not lower than UHPC100, and it has excellent working performance and durability. The first reinforcement 22 fixed to the UHPC permanent formwork 2 is extended into the steel skeleton 3. After the concrete 4 is poured, the first reinforcement 22 is also embedded in the internal structure of the concrete 4, and is more convenient to fix with the concrete 4. Compared with the related art that directly uses steel plates as the outer wall steel plate-concrete combination The inner wall steel plate of the bridge tower, the UHPC permanent formwork 2 has a low cost, and a support mesh 21 is installed in the UHPC permanent formwork 2, and the first reinforcement 22 is directly fixed to the support mesh 21, so that when the UHPC permanent formwork 2 is poured with concrete 4, the first reinforcement 22 extending into the steel skeleton 3 can be used to quickly fix the UHPC permanent formwork 2 and the concrete 4 layer; and compared with the use of temporary steel formwork, the UHPC permanent formwork 2 can reduce the steps of dismantling and save manpower, and solves the technical problems in the related art that the on-site dismantling of the temporary steel formwork inside the outer wall steel plate-concrete composite bridge tower is difficult, time-consuming and labor-intensive, and has a low turnover rate, resulting in a waste of resources.

[0034] In some optional embodiments, a plurality of longitudinal stiffening ribs 11 are fixed at intervals on the outer side of the outer wall steel plate 1, and a plurality of transverse stiffening ribs 12 are fixed at intervals between two adjacent longitudinal stiffening ribs 11; a plurality of second stiffening members 13 are also fixed on the inner side of the outer wall steel plate 1, each of the second stiffening members 13 extends in a direction perpendicular to the plate surface of the outer wall steel plate 1, and each of the second stiffening members 13 extends into the steel skeleton 3. In the embodiment of the present application, a plurality of longitudinal stiffening ribs 11 and transverse stiffening ribs 12 are fixed on the outer wall steel plate 1 respectively, which can enhance the torsion resistance and stability of the outer steel plate, and the longitudinal stiffening ribs 11 and transverse stiffening ribs 12 are installed on the outer side, that is, installed on the side of the outer wall steel plate 1 away from the casting cavity, which can reduce the structure extending into the casting cavity, that is, simplify the structure inside the casting cavity, reduce the difficulty of on-site construction, and when pouring concrete 4, due to the simplification of the internal structure of the casting cavity, it can also reduce the generation of holes in the concrete 4, enhance the compactness of the pouring and filling of the concrete 4, and enhance the quality of the bridge tower 5. Preferably, the second reinforcement member 13 can be configured as a shear nail, or other connecting members that can connect the poured concrete 4 with the outer wall steel plate 1, such as bolts and studs.

[0035] In some optional embodiments, the peripheral sides of the UHPC permanent formwork 2 are provided with a snap-fit ​​section 23, and two adjacent UHPC permanent formworks 2 are connected by the snap-fit ​​section 23. That is, two adjacent UHPC permanent formworks 2 can be connected by a mortise and tenon structure, and the peripheral sides of the UHPC permanent formwork 2 can be provided with a snap-fit ​​section 23, so that two adjacent UHPC permanent formworks 2 in the transverse direction or two adjacent UHPC permanent formworks 2 in the longitudinal direction can be connected by the snap-fit ​​section. By providing the snap-fit ​​section, two adjacent UHPC permanent formworks 2 can be quickly connected, and the connection is also relatively firm, saving construction time.

[0036] See also Figure 2As shown, in some optional embodiments, the engaging section 23 includes a concave section 231 and a convex section 232 connected to the concave section 231, the concave section 231 is connected to the UHPC permanent formwork 2, and the convex section 232 is fixed to the side of the concave section 231 away from the UHPC permanent formwork 2, and the concave section 231 of one of the UHPC permanent formworks 2 is clamped on the convex section 232 of another UHPC permanent formwork 2. In other words, the convex section 232 and the concave section 231 can be set to have the same width, so that the concave section 231 of one of the UHPC permanent formworks 2 can be clamped on the convex section 232 of another UHPC permanent formwork 2, and the convex section 232 and the concave section 231 can be filled with epoxy adhesive for bonding and sealing. The inner concave section 231 of one UHPC permanent formwork 2 cooperates with the convex section 232 of another UHPC permanent formwork 2, which can increase the connection reliability between the two adjacent UHPC permanent formworks 2, and the construction workers do not need to perform complicated welding or bolting at this time, which not only helps to shorten the construction period, but also reduces the construction cost. Furthermore, since the bridge towers 5 of large-span bridges are mostly built in coastal areas, the UHPC permanent formwork 2 has good corrosion resistance and abrasion resistance, which can protect the concrete 4 to a certain extent, reducing the cost of anti-corrosion coating and maintenance. .

[0037] In some optional embodiments, the sides of the two adjacent engaging sections 23 that are bonded to each other are provided with a roughened surface. Specifically, the UHPC permanent formwork 2 is prefabricated in a factory, and a support mesh 21 is tied in the initial formwork. The support mesh 21 may include a plurality of crisscrossed steel bars. The first reinforcement may be welded at the overlap position of the longitudinal and transverse steel bars. A grass-patterned roughened belt is prefabricated on the side of the two adjacent engaging sections 23 that are bonded to each other, and UHPC is poured and cured. After the curing is completed, the inner surface of the UHPC permanent formwork 2 is hydraulically roughened and transported to the construction site. The contact area of ​​the two adjacent engaging sections 23 can be increased by providing a roughened surface, and the roughened surfaces can have stronger adhesion to the epoxy adhesive, thereby enhancing the connection strength.

[0038] See also Figure 3As shown, in some optional embodiments, the steel bar skeleton 3 includes a plurality of vertical steel bars 31 arranged at intervals, and a plurality of stirrups 32 are arranged around the outer periphery of the plurality of vertical steel bars 31, and the plurality of stirrups 32 are arranged at intervals along the extension direction of the vertical steel bars 31, and at least part of the top surface of the stirrups 32 is fixed with an inverted U-shaped steel bar 33. In the embodiment of the present application, the inverted U-shaped steel bar 33 can be fixed at the stirrups at the top of each segment of the steel bar skeleton 3, so that when pouring concrete, part of the inverted U-shaped steel bar 33 can be poured into the segment, and the other part is fixed with the concrete of the next segment when pouring the next segment. Further, the vertical steel bars 31 of the steel bar skeleton 3 can include two layers of vertical bars, each of which is surrounded by a ring, wherein one layer of the vertical bars is located on the side of the vertical steel bar 31 close to the outer wall steel plate 1, and the other layer is located on the side of the vertical steel bar 31 close to the UHPC permanent formwork 2. Each vertical reinforcement layer is surrounded by a plurality of stirrups 32, and the two vertical reinforcement layers can be fixed by a plurality of transverse short bars 34. In addition, by fixing the inverted U-shaped steel bars 33 on the top surface of some stirrups 32, the geometric shape and dimensional stability of the steel skeleton 3 can be maintained, effectively reducing the possibility of displacement or deformation of the steel bars during the pouring of concrete 4.

[0039] See also Figure 6 As shown, the embodiment of the present application also provides a construction method of the above-mentioned combined bridge tower structure, which may include the following steps:

[0040] S1: The outer wall steel plate 1 is arranged around the outer periphery of the steel frame 3, so that the outer wall steel plate 1 forms an installation cavity; in the embodiment of the present application, before the outer wall steel plate 1 is installed, the steel frame 3 can be pre-assembled, and the pre-assembled steel frame 3 can be hoisted to a preset position, and then the outer wall steel plate 1 is arranged around the outer periphery of the steel frame 3 to form an installation cavity. Preferably, a certain distance can be maintained between the outer wall steel plate 1 and the steel frame 3 during installation. In some other embodiments, the outer wall steel plate 1 can be welded and assembled in sections in the factory, and then the outer wall steel plate 1 that forms the installation cavity can be hoisted to a preset position, and then the steel frame 3 can be gradually assembled in the installation cavity.

[0041] S2: Install the UHPC permanent formwork 2 to the side of the steel skeleton 3 away from the outer wall steel plate 1, so that the UHPC permanent formwork 2 encloses the bridge tower cavity, and the first reinforcement 22 extends into the steel skeleton 3; preferably, the UHPC permanent formwork 2 also maintains a certain distance from the steel skeleton 3 during installation, but the distance needs to allow the first reinforcement 22 to still be able to extend into the steel skeleton 3.

[0042] S3: pouring concrete 4 into the casting cavity to form a segment of the bridge tower 5; that is, in the embodiment of the present application, the bridge tower 5 is manufactured in segments, and after the outer wall steel plate 1, UHPC permanent formwork 2 and steel skeleton 3 of one segment are assembled, pouring concrete 4 into the casting cavity completes the construction of the segment bridge tower 5. Preferably, the height of each tower column segment can be controlled between 4m and 6m.

[0043] S4: Complete the construction of the next section according to the above steps until the bridge tower 5 is capped. After the construction of the bridge tower 5 of the previous section is completed, the poured concrete 4 solidifies to a certain state and the curing is completed, and then the assembly process of the outer wall steel plate 1, the UHPC permanent formwork 2 and the steel skeleton 3 is repeated. After the assembly is completed, the concrete 4 is poured into the casting cavity of the assembled section until the bridge tower 5 is capped. Preferably, the poured concrete 4 solidifies to a certain state and the curing is completed, and after the concrete 4 is dried to a preset state, the joint surface of the new and old concrete 4 on the top surface of the previous section is hydraulically or mechanically roughened to ensure the quality of the joint between the new and old concrete 4.

[0044] In some optional embodiments, the steel skeleton 3 includes a plurality of vertical steel bars 31 and stirrups 32 arranged around the plurality of vertical steel bars 31, and inverted U-shaped steel bars 33 are fixed to the top surfaces of some of the stirrups 32. The pouring of concrete 4 into the casting cavity includes: pouring the concrete 4 to the middle of the inverted U-shaped steel bars 33, and making the top surface of the concrete 4 lower than the top surface of the UHPC permanent formwork 2, and the top surface of the concrete 4 lower than the top surface of the outer wall steel plate 1. In the embodiment of the present application, the inverted U-shaped steel bar 33 can be welded before the corresponding stirrup 32 is arranged on the periphery of the vertical steel bar 31, or the stirrup 32 can be arranged on the periphery of the vertical steel bar 31, and then the inverted U-shaped steel bar 33 is welded on the corresponding stirrup 32. When pouring the concrete 4, it can be poured to the middle of the inverted U-shaped steel bar 33, and the middle can refer to the middle position or any middle position other than the initial two ends. At this time, the top surface of the poured concrete 4 has a certain height difference with the outer wall steel plate 1 and the UHPC permanent formwork 2. During the construction of the bridge tower 5, the splicing positions of the structures are usually weak. Forming a certain height difference between the top surface of the concrete 4 and the outer wall steel plate 1 and the UHPC permanent formwork 2 can make the splicing positions between the structures not on the same horizontal plane, that is, the weak points of the structures are not on the same horizontal plane, which can enhance the overall strength of the bridge tower 5. Preferably, the height difference between the top surface of the concrete 4 in the corresponding segment and the top surface of the UHPC permanent formwork 2 can be set to 30 cm to 50 cm. During pouring, the self-compacting concrete 4 can be poured and vibrated sufficiently, and the strength grade of the self-compacting concrete 4 is C50 to C60.

[0045] In some optional embodiments, the UHPC permanent formwork 2 is fixed with a snap-fit ​​section 23 on the circumference, and two adjacent UHPC permanent formworks 2 are connected by the snap-fit ​​section 23. After pouring the concrete 4 to the middle of the inverted U-shaped steel bar 33 and making the top surface of the concrete 4 lower than the top surface of the UHPC permanent formwork 2, the following steps are included: hoisting and fixing the steel skeleton 3 of the next section to the top of the steel skeleton 3 of the previous section, and continuing to splice the next section outer wall steel plate 1 on the top surface of the outer wall steel plate 1 of the previous section; splicing the next section UHPC permanent formwork 2 on the top surface of the UHPC permanent formwork 2 of the previous section, and using epoxy adhesive to bond the snap-fit ​​sections of the two adjacent UHPC permanent formworks 2; pouring concrete 4 into the pouring cavity of the next section. Preferably, the thickness of each UHPC permanent formwork 2 is set to 50mm to 100mm, the width is 2m to 3m, and the length is 4m to 6m for easy transportation.

[0046] In some optional embodiments, before the UHPC permanent formwork 2 is installed to the side of the splicing frame away from the outer wall steel plate 1, it includes: pre-embedding a support mesh 21 in the UHPC permanent formwork 2, and fixing a plurality of first reinforcement members 22 on the support mesh 21. In the embodiment of the present application, the first reinforcement member 22 may be a stud, and the support mesh 21 may include a plurality of transverse steel bars and a plurality of longitudinal steel bars fixed to each other, and the stud may be fixed at the connection between the transverse steel bars and the longitudinal steel bars.

[0047] Furthermore, the second reinforcement 13 fixed on the outer wall steel plate 1 can be a shear nail, and the transverse stiffening ribs 12 and the longitudinal stiffening ribs 11 fixed to the outer wall steel plate 1 can be welded to the inner and outer sides of the outer wall steel plate 1 respectively with the shear nails. After welding, the shear nails are treated with anti-rust spray paint and divided into reasonable sections according to the lifting capacity and transportation conditions.

[0048] Preferably, the cross-sectional profile of the tower column can be polygonal, circular or other special shapes. The corners of the cross-sectional profile can be chamfered according to the wind resistance requirements. In the embodiment of the present application, the transverse stiffening ribs 12 and the longitudinal stiffening ribs 11 fixed to the outer wall steel plate 1 are transferred from the inner side of the outer wall steel plate 1 to the outer side, which simplifies the internal structure, facilitates the construction of steel bars and prestressed bars, greatly improves the construction efficiency, solves the problem that the concrete 4 is not easy to be poured densely, and improves the overall construction quality. In addition, the inner wall steel plate that does not contribute much to the bearing capacity is removed, and the UHPC permanent formwork 2 is used to replace the temporary steel formwork. The UHPC material itself has excellent working performance and durability and has good interface bonding with the concrete 4, and reliable force transmission. The UHPC permanent formwork 2 does not need to be removed after the concrete 4 is cured, and the outer surface does not need to be painted, and no maintenance is required in the later stage. During the use stage of the bridge tower 5, it can still share the load with the steel plate and concrete 4, which not only ensures the high ductility and high bearing capacity of the combined bridge tower, but also simplifies the construction process, reduces the overall cost, and improves the durability of the combined bridge tower. Furthermore, the segment joint surface of the outer wall steel plate 1 and the UHPC permanent formwork 2 at the tower segment joint position is not on the same level as the interface between the new and old concrete 4, and structural steel bars are pre-embedded, which improves the crack resistance of the interface and makes the joint form simple and reliable.

[0049] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0050] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0051] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A combined bridge tower structure, characterized in that: It includes: An outer wall steel plate (1), wherein the outer wall steel plate (1) encloses a mounting cavity; A UHPC permanent formwork (2), the UHPC permanent formwork (2) is located in the installation cavity, and the UHPC permanent formwork (2) encloses a bridge tower cavity, the outer wall steel plate (1) and the UHPC permanent formwork (2) cooperate to enclose a casting cavity, a support net (21) is installed in the UHPC permanent formwork (2), and the UHPC permanent formwork (2) is fixed with a plurality of first reinforcement members (22) at intervals, one end of each of the first reinforcement members (22) is fixed to the support net (21), and the other end of each of the first reinforcement members (22) extends in a direction perpendicular to the plate surface of the UHPC permanent formwork (2); A steel reinforcement skeleton (3), the steel reinforcement skeleton (3) is located in the casting cavity, and the first reinforcement member (22) extends into the steel reinforcement skeleton (3).

2. The combined bridge tower structure according to claim 1, characterized in that: A plurality of longitudinal stiffening ribs (11) are fixed at intervals on the outer side of the outer wall steel plate (1), and a plurality of transverse stiffening ribs (12) are fixed at intervals between two adjacent longitudinal stiffening ribs (11); A plurality of second reinforcement members (13) are also fixed to the inner side of the outer wall steel plate (1), each of the second reinforcement members (13) extending in a direction perpendicular to the plate surface of the outer wall steel plate (1), and each of the second reinforcement members (13) extends into the steel frame (3).

3. The combined bridge tower structure according to claim 1, characterized in that: The peripheral sides of the UHPC permanent formwork (2) are each provided with a snap-fit ​​section (23), and two adjacent pieces of the UHPC permanent formwork (2) are connected via the snap-fit ​​section (23).

4. The combined bridge tower structure according to claim 3, characterized in that: The engaging section (23) comprises a concave section (231) and a convex section (232) connected to the concave section (231), the concave section (231) being connected to the UHPC permanent formwork (2), and the convex section (232) being fixed to a side of the concave section (231) away from the UHPC permanent formwork (2), wherein the concave section (231) of one of the UHPC permanent formworks (2) is engaged with the convex section (232) of another of the UHPC permanent formworks (2).

5. The combined bridge tower structure according to claim 3, characterized in that: The sides of two adjacent engaging sections (23) that are in contact with each other are both provided with a roughened surface.

6. The combined bridge tower structure according to claim 1, characterized in that: The steel bar skeleton (3) comprises a plurality of vertical steel bars (31) arranged at intervals, a plurality of stirrups (32) being arranged around the plurality of vertical steel bars (31), the plurality of stirrups (32) being arranged at intervals along the extension direction of the vertical steel bars (31), and an inverted U-shaped steel bar (33) being fixed to the top surface of at least some of the stirrups (32).

7. A construction method for a combined bridge tower structure as claimed in claims 1 to 6, characterized in that: It includes the following steps: The outer wall steel plate (1) is arranged around the outer periphery of the steel frame (3) so that the outer wall steel plate (1) forms an installation cavity; Installing the UHPC permanent formwork (2) to the side of the steel frame (3) away from the outer wall steel plate (1), so that the UHPC permanent formwork (2) encloses the bridge tower cavity, and the first reinforcement member (22) extends into the steel frame (3); pouring concrete (4) into the casting cavity to form a segment of the bridge tower (5); The construction of the next section is completed according to the above steps until the bridge tower (5) is capped.

8. The construction method according to claim 7, characterized in that: The steel bar skeleton (3) comprises a plurality of vertical steel bars (31) and stirrups (32) arranged around the outer periphery of the plurality of vertical steel bars (31), and inverted U-shaped steel bars (33) are fixed to the top surfaces of some of the stirrups (32). The pouring of concrete (4) into the casting cavity comprises: Concrete (4) is poured to the middle of the inverted U-shaped steel bar (33), and the top surface of the concrete (4) is lower than the top surface of the UHPC permanent formwork (2), and the top surface of the concrete (4) is lower than the top surface of the outer wall steel plate (1).

9. The construction method according to claim 8, characterized in that: The UHPC permanent formwork (2) is fixed with a snap-fit ​​section (23) on the circumferential side thereof, and two adjacent pieces of the UHPC permanent formwork (2) are connected via the snap-fit ​​section (23). After the concrete (4) is poured to the middle of the inverted U-shaped steel bar (33) and the top surface of the concrete (4) is made lower than the top surface of the UHPC permanent formwork (2), the method comprises: The steel frame (3) of the next section is hoisted and fixed to the top of the steel frame (3) of the previous section, and the outer wall steel plate (1) of the next section is continuously spliced ​​on the top surface of the outer wall steel plate (1) of the previous section; splicing the next segment of UHPC permanent formwork (2) on the top surface of the previous segment of UHPC permanent formwork (2), and bonding the clamping sections of two adjacent UHPC permanent formworks (2) with epoxy adhesive; Concrete is poured into the pouring cavity of the next section (4).

10. The construction method according to claim 7, characterized in that: Before the UHPC permanent formwork (2) is installed on the side of the splicing frame away from the outer wall steel plate (1), the method includes: A support mesh (21) is pre-embedded in the UHPC permanent formwork (2), and a plurality of first reinforcement members (22) are fixed to the support mesh (21).

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