Bottom formwork of stiff framework, stiff framework and construction method of stiff framework

Abstract

The invention relates to the field of bridge construction, in particular to a bottom formwork of a stiff framework, the stiff framework and a construction method of the stiff framework, the bottom formwork is formed by mutually connecting a plurality of prefabricated sections, connecting assemblies are arranged in the prefabricated sections, the bottom formwork of the stiff framework is connected through the connecting assemblies, the bottom formwork and the stiff framework form a whole, and the stiff framework is arranged on the stiff framework. Operators are prevented from mounting and dismounting a pouring template at the bottom of the stiff framework, so that the construction risk is avoided, and the construction efficiency is improved; the stiff framework is formed by connecting the bottom formwork and a frame body of the stiff framework, the bottom formwork and the frame body are connected to form a stiff framework body, installation of the bottom formwork on a construction site is avoided, and therefore construction efficiency is improved, and construction safety of operators is guaranteed. According to the construction method of the stiff frameworks, the arch bridge framework is formed by splicing the stiff frameworks, the building speed of the arch bridge framework can be increased, and the building efficiency of an arch bridge is improved.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, and in particular to a bottom template of a rigid frame, a rigid frame and a construction method thereof. Background Art

[0002] The construction method of the rigid frame concrete arch bridge is: first hoist and close the steel structure frame, then pour concrete into the pipe, and then use it as a construction platform to pour the outer concrete; the rigid frame concrete arch bridge has the advantages of large overall rigidity, full material application and good economy.

[0003] However, when pouring the outer concrete of the rigid frame concrete arch bridge, workers are required to set up formwork on the rigid frame. Especially when setting the bottom formwork, the working space interferes with the frame of the rigid frame, which makes it difficult for workers to work. When constructing the formwork, there are problems such as complicated construction steps, narrow construction working surface and long construction period. Moreover, the pouring of the bottom plate also involves high-altitude operations, which has great construction risks and makes it difficult to ensure the safety of workers. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that when setting the bottom template of a rigid frame, there are construction difficulties and the safety of the operation cannot be guaranteed, and to provide a bottom template of a rigid frame, a rigid frame and a construction method thereof.

[0005] In a first aspect, the present invention provides a bottom template of a rigid frame, comprising If the prefabricated segments are involved, the prefabricated segments are U-shaped through-slots, and a plurality of the prefabricated segments are connected end to end in sequence; The prefabricated segment comprises a U-shaped prefabricated part and a plurality of connecting components, wherein the plurality of connecting components are arranged in a longitudinal direction in a groove on a top side of the U-shaped prefabricated part; The connection assembly is provided with a plurality of shear nails and a plurality of steel bar holes. The shear nails are embedded in the U-shaped prefabricated parts. The steel bar holes are used for passing cast steel bars. The connection assembly is used for connecting the frame of the rigid skeleton.

[0006] The bottom template of a rigid skeleton of the present invention is connected by a plurality of prefabricated segments in a head-to-tail manner, the prefabricated segments are in the shape of a U-shaped through groove, and after the plurality of prefabricated segments are connected, the bottom template is in the shape of a U-shaped through groove, so that the poured concrete can be retained in the groove of the bottom template, reducing the difficulty of pouring the rigid skeleton; after pouring, the bottom template is formed as a whole with the bottom template and the poured concrete, thereby avoiding the installation and disassembly of the bottom template during construction, improving the working efficiency, optimizing the working process, reducing the construction difficulty, and ensuring the safety of the workers; the prefabricated segments are composed of a U-shaped prefabricated part and a plurality of connecting components, the connecting components are fixed in the groove on the top side of the U-shaped prefabricated part by shear nails, ensuring that the connecting components are firmly fixed on the U-shaped prefabricated part; steel bar holes are provided for passing steel bars for pouring, ensuring the connection strength between the poured concrete and the bottom template; by arranging a plurality of connecting components on the U-shaped prefabricated part, more connection positions are provided for the frame of the rigid skeleton, so that the frame of the rigid skeleton is firmly connected to the bottom template, thereby ensuring the structural strength of the rigid skeleton.

[0007] Preferably, the bottom formwork of the rigid frame further comprises factory joints, and adjacent U-shaped prefabricated parts are connected via the factory joints.

[0008] Adjacent U-shaped prefabricated parts are connected by factory joints. The factory joints are concrete components cast in the factory. The factory joints fill the connection gaps between the adjacent U-shaped prefabricated parts. The factory joints ensure that the adjacent U-shaped prefabricated segments are firmly connected.

[0009] Preferably, both ends of the U-shaped prefabricated component are respectively provided with connecting grooves, and the two opposite sides of the factory joint component are respectively provided with connecting protrusions, and the connecting grooves can be adapted to be connected with the connecting protrusions.

[0010] When the connection gap is filled by pouring concrete, the concrete solidifies and fills the connection groove to form a factory joint. After the concrete solidifies, a connection protrusion that fits the connection groove is formed, thereby ensuring that adjacent U-shaped prefabricated parts are firmly connected.

[0011] Preferably, the U-shaped prefabricated component is a UHPC structural component.

[0012] UHPC refers to ultra-high performance concrete, which is a cement-based concrete material with super mechanical properties, high toughness, ultra-high durability and excellent casting and molding properties. The U-shaped prefabricated parts cast by UHPC have the material properties of ultra-high performance concrete.

[0013] Preferably, the connecting assembly includes a steel strip and a stiffening rib, the stiffening rib is connected to the steel strip, the steel strip is arranged in a transverse direction, a plurality of shear nails are arranged in the steel strip, the stiffening rib is provided with a plurality of steel bar holes, and the stiffening rib can connect the frame of the rigid skeleton.

[0014] The connection assembly is composed of steel strips and stiffening ribs. The steel bar holes are set on the stiffening ribs. To ensure the uniformity of the structure after casting, the spacing between adjacent steel bar holes is equal; the steel strips are attached to the U-shaped prefabricated parts, and a number of shear nails are embedded in the U-shaped prefabricated parts to firmly fix the steel strips and the U-shaped prefabricated parts. To ensure that the U-shaped prefabricated parts are subjected to uniform force, the shear nails are arranged at intervals on the steel strips; in some embodiments, two rows of shear nails are arranged on the steel strips.

[0015] Preferably, the steel strips and the stiffening ribs are both U-shaped structural members, the steel strips are adaptively connected to the U-shaped prefabricated members, and the stiffening ribs are adaptively connected to the steel strips.

[0016] The steel strips and the stiffening ribs are adapted to the shape of the U-shaped structural member, so that the steel strips and the stiffening ribs are both U-shaped structural members, thereby ensuring that the U-shaped prefabricated member is subjected to uniform force.

[0017] Preferably, the stiffening rib is provided with a welding portion, and the welding portion is used for welding and connecting with the frame of the stiff skeleton.

[0018] The frame of the rigid skeleton is welded and fixed on the stiffening ribs by welding, so that the bottom formwork is firmly connected to the frame.

[0019] In a second aspect, the present invention provides a rigid frame, comprising a frame body and a bottom template of the rigid frame described above, wherein the frame body is disposed in a groove on the top side of the U-shaped prefabricated component, and the frame body is connected to the connecting assembly.

[0020] A rigid frame of the present invention adopts a bottom template of the rigid frame to connect the bottom template with a frame to form a rigid frame. When the rigid frame is cast, the bottom template and the cast concrete form a whole, which can avoid the installation and disassembly of the bottom template; saves construction time, reduces construction difficulty, and ensures the safety of operators; by arranging the frame in a groove on the top side of a U-shaped prefabricated part, the frame is easier to connect with the connecting assembly.

[0021] Preferably, the frame includes a first lower chord tube, a second lower chord tube, a straight link and an upper structure, one end of the straight link is connected to the first lower chord tube, and the other end is connected to the second lower chord tube, the first lower chord tube and the second lower chord tube are parallel, the upper structure is connected to the first lower chord tube, the upper structure is connected to the second lower chord tube, and the first lower chord tube, the second lower chord tube and the straight link are respectively connected to the connecting assembly.

[0022] The frame is fixed on the bottom template by the first lower chord tube, the second lower chord tube and the straight joint, respectively. The upper structure includes an upper chord tube, a straight web and an oblique web. One end of the straight web is connected to the upper chord tube, and the other end is connected to the connecting assembly. The oblique web includes a first rod body and a second rod body. The two ends of the first rod body are respectively connected to the upper chord tube and the straight web, and the two ends of the second rod body are respectively connected to the straight web and the connecting assembly. The straight web plays a supporting role, fixing the upper chord tube at a specified height. A triangular structure is formed by the oblique web, thereby avoiding deformation at the connection between the straight web and the upper chord tube, and at the connection between the straight web and the connecting assembly, thereby ensuring the structural stability of the rigid skeleton.

[0023] In a third aspect, the present invention provides a method for constructing a rigid frame, the method for constructing the rigid frame described above, characterized in that it comprises the following steps: S1: Determine the prefabricated segment specifications: determine the size of the U-shaped prefabricated parts and the size of the connecting components; S2: Adjust the size of the prefabricated segment: construct a finite element model of the prefabricated segment with the size of the U-shaped prefabricated component and the size of the connecting component determined in S1, analyze the structural strength of the prefabricated segment with the finite element method, and adjust the U-shaped prefabricated component and the connecting component until the strength and stiffness of the prefabricated segment meet the requirements; S3: Design shear studs: design the number and size of shear studs based on the U-shaped prefabricated parts and connection component data adjusted in S2; obtain the design parameters of the prefabricated segment; S4: constructing the bottom formwork: manufacturing prefabricated segments according to the design parameters of S3, and splicing multiple prefabricated segments to form the bottom formwork; S5: Assembling the rigid frame: connecting the connection components on the bottom template with the frame of the rigid frame; S6: Splicing the arch bridge frame: The skeleton of the arch bridge is formed by hoisting and connecting several rigid frames.

[0024] The present invention provides a construction method for a rigid frame, wherein a bottom template of the rigid frame is connected to a frame body to form a whole, and the bottom template is made by fully utilizing the rigidity and strength advantages of the material, thereby replacing a traditional wooden template and a steel template; during the hoisting process of the rigid frame, the bottom template is hoisted together with the frame body of the rigid frame, so that the bottom template serves as a working platform, and the disassembly of the bottom template after pouring is avoided, thereby optimizing the operation process, reducing the risk of high-altitude operations for operators, and improving construction efficiency.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. A bottom template of a rigid skeleton of the present invention is connected by a plurality of prefabricated segments in a head-to-tail connection manner, the prefabricated segments are in a U-shaped through-groove shape, and after the plurality of prefabricated segments are connected, the bottom template is in a U-shaped through-groove shape, so that the poured concrete can be retained in the groove of the bottom template, thereby reducing the difficulty of pouring the rigid skeleton; after pouring, the bottom template is formed as a whole with the bottom template and the poured concrete, thereby avoiding the installation and disassembly of the bottom template during construction, improving the working efficiency, optimizing the working process, reducing the construction difficulty, and ensuring the safety of the workers; the prefabricated segments are composed of a U-shaped prefabricated part and a plurality of connecting components, the connecting components are fixed in the groove on the top side of the U-shaped prefabricated part by shear nails, and ensure that the connecting components are firmly fixed on the U-shaped prefabricated part; a steel bar hole is provided for passing the steel bar for pouring, and the connection strength between the poured concrete and the bottom template is ensured; by arranging a plurality of connecting components on the U-shaped prefabricated part, more connection positions are provided for the frame of the rigid skeleton, so that the frame of the rigid skeleton is firmly connected to the bottom template, thereby ensuring the structural strength of the rigid skeleton; 2. A rigid frame of the present invention adopts a bottom template of the rigid frame to connect the bottom template with the frame to form a rigid frame. When the rigid frame is poured, the bottom template and the poured concrete form a whole, which can avoid the installation and removal of the bottom template; save construction time, reduce construction difficulty, and ensure the safety of workers; by arranging the frame in the groove on the top side of the U-shaped prefabricated part, the frame is easier to connect with the connecting assembly; 3. A construction method for a rigid frame of the present invention, wherein a bottom template of the rigid frame is connected to a frame body to form a whole, and the bottom template is made by fully utilizing the rigidity and strength advantages of the material, thereby replacing a traditional wooden template and a steel template; during the hoisting process of the rigid frame, the bottom template is hoisted together with the frame body of the rigid frame, so that the bottom template serves as a working platform, avoiding the disassembly of the bottom template after pouring is completed, thereby optimizing the operation process, reducing the risk of high-altitude operations for operators, and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the top view of the bottom template of a rigid skeleton of the present invention; Figure 2 It is a structural schematic diagram of the aa section of a bottom template of a rigid skeleton of the present invention; Figure 3 It is a partially enlarged structural schematic diagram of the aa section of a bottom template of a rigid skeleton of the present invention; Figure 4 It is a schematic diagram of the layout structure of the shear studs of the bottom formwork of a rigid frame of the present invention; Figure 5 It is a structural schematic diagram of a factory joint piece of a bottom template of a rigid frame of the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of a rigid skeleton of the present invention; Figure 7 A schematic diagram of a connection structure of a rigid skeleton of the present invention; Figure 8 It is a structural schematic diagram of a rigid skeleton of the present invention; Fig. 9 The present invention is a schematic diagram of a process flow of a rigid frame construction method.

[0026] Markings in the figure: 1-precast segment, 11-U-shaped precast part, 12-connection assembly, 121-stiffening rib, 122-steel plate, 13-shear nail, 14-rebar hole, 15-welding part, 16-connection groove, 2-factory joint, 21-connection protrusion, 3-frame, 31-first lower chord tube, 32-second lower chord tube, 33-straight connection, 34-superstructure. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0028] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0030] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0031] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0032] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0033] Example 1 like Figure 1-Figure 5 The bottom template of a rigid skeleton shown in FIG. If the prefabricated segment 1 is used, the prefabricated segment 1 is in the shape of a U-shaped through groove, and a plurality of the prefabricated segments 1 are connected end to end in sequence; The prefabricated segment 1 comprises a U-shaped prefabricated component 11 and a plurality of connecting components 12, wherein the plurality of connecting components 12 are arranged in a longitudinal direction in a groove on the top side of the U-shaped prefabricated component 11; The connection assembly 12 is provided with a plurality of shear nails 13 and a plurality of steel bar holes 14 . The shear nails 13 are embedded in the U-shaped prefabricated part 11 . The steel bar holes 14 are used for passing cast steel bars. The connection assembly 12 is used for connecting the frame 3 of the rigid skeleton.

[0034] The prefabricated segments 1 are connected in a head-to-tail manner. The prefabricated segments 1 are U-shaped through grooves. After the prefabricated segments 1 are connected, the bottom template is U-shaped through grooves, so that the poured concrete can be retained in the grooves of the bottom template, reducing the difficulty of pouring the rigid skeleton; after pouring, it forms a whole with the bottom template and poured concrete, thereby avoiding the installation and disassembly of the bottom template during construction, improving the work efficiency, optimizing the work process, reducing the construction difficulty, and ensuring the safety of the workers; the prefabricated segment 1 is composed of U-shaped prefabricated parts 11 It is composed of a plurality of connection components 12, which are fixed in the groove on the top side of the U-shaped prefabricated part 11 by shear nails 13 to ensure that the connection component 12 is firmly fixed on the U-shaped prefabricated part 11; steel bar holes 14 are provided for passing steel bars for pouring to ensure the connection strength between the poured concrete and the bottom template; by arranging a plurality of connection components 12 on the U-shaped prefabricated part 11, more connection positions are provided for the frame 3 of the rigid skeleton, so that the frame 3 of the rigid skeleton is firmly connected to the bottom template, thereby ensuring the structural strength of the rigid skeleton.

[0035] In one or several embodiments, the bottom formwork of the rigid frame further includes a factory seam 2, and adjacent U-shaped prefabricated members 11 are connected by the factory seam 2; the factory seam 2 connects adjacent U-shaped prefabricated members 11, so that a plurality of U-shaped prefabricated members 11 are interconnected to form the bottom formwork of the rigid frame.

[0036] In an optional embodiment, connecting grooves 16 are respectively provided at both ends of the U-shaped prefabricated part 11, and connecting protrusions 21 are respectively provided on the opposite sides of the factory joint part 2, and the connecting grooves 16 can be adapted to be connected with the connecting protrusions 21; the connecting protrusions 21 are adapted to be clamped in the connecting grooves 16, so that adjacent U-shaped prefabricated parts 11 can support each other, thereby ensuring the load-bearing capacity of the U-shaped prefabricated part 11, and when concrete is poured in the groove on the top side of the U-shaped prefabricated part 11, it is ensured that the U-shaped prefabricated part 11 has sufficient strength to bear the concrete.

[0037] In one or more embodiments, the U-shaped prefabricated member 11 is a UHPC structural member; UHPC is considered to be the most durable engineering material, and the mechanical properties of UHPC structural members with appropriate reinforcement are close to those of steel structures. At the same time, UHPC has excellent wear resistance and explosion resistance, thereby ensuring the structural strength of the U-shaped prefabricated member 11.

[0038] In one or more embodiments, the connection assembly 12 includes a steel strip 122 and a stiffening rib 121, the stiffening rib 121 is welded to the steel strip 122, the shape of the stiffening rib 121 and the steel strip 122 is adapted to make the stiffening rib 121 firmly welded to the steel plate, the steel strip 122 is arranged in the transverse direction, the stiffening rib 121 is also arranged in the transverse direction, a plurality of steel strips 122 are arranged in the longitudinal direction, a plurality of shear nails 13 are arranged in the steel strip 122, and the shear nails 13 are arranged in the steel strip 122. The nails 13 and the stiffening ribs 121 are respectively located on the opposite sides of the steel plate strips 122, so that the shear nails 13 are embedded in the U-shaped prefabricated component 11 and then the stiffening ribs 121 are located on the top side of the U-shaped prefabricated component 11. A plurality of steel bar holes 14 are provided on the stiffening ribs 121, and the steel bar holes 14 are arranged in an interval arrangement to ensure uniform steel bar arrangement. The stiffening ribs 121 can be connected to the frame 3 of the rigid frame, so that the frame 3 of the rigid frame and the bottom template of the rigid frame are connected to form a rigid frame.

[0039] In an optional embodiment, the steel strips 122 and the stiffening ribs 121 are both U-shaped structural members, the steel strips 122 are adaptably connected to the U-shaped preform 11, and the stiffening ribs 121 are adaptably connected to the steel strips 122; the steel strips 122 and the stiffening ribs 121 are adapted to the grooves at the top of the U-shaped preform 11 to ensure the structural strength of the U-shaped preform 11.

[0040] In an optional embodiment, the stiffening rib 121 is provided with a welding portion 15, and the welding portion 15 is welded to the frame 3 of the rigid frame; the welding portion 15 firmly connects the stiffening rib 121 to the frame 3 of the rigid frame, and a plurality of welding portions 15 are provided on a stiffening rib 121, and the frame 3 of the rigid frame is welded and connected through the plurality of welding portions 15 to ensure the firmness of the connection.

[0041] Specifically, the prefabricated segment 1 is composed of a U-shaped prefabricated part 11 cast by a steel strip 122, a shear nail 13, a stiffening rib 121 and a U-shaped prefabricated part 11, wherein the steel strip 122 is connected and fixed to the U-shaped prefabricated part 11 by the shear nail 13, and the stiffening rib 121 is connected to the steel strip 122 to avoid deformation of the steel strip 122, thereby ensuring the structural strength of the U-shaped prefabricated part 11; a steel bar hole 14 is opened on the steel strip 122 for passing steel bars during casting, thereby reinforcing the connection strength between the bottom formwork and the cast concrete; the shear nail 13 is welded and fixed on the steel strip 122, so that the shear nail 13 and the stiffening rib 121 are respectively located on the opposite sides of the steel strip 122; and a reinforcement hole 14 is reserved on the stiffening rib 121 for connecting the stiffening ribs The welding part 15 of the frame body 3 of the frame is connected and fixed to the stiffening rib 121 by welding; the U-shaped prefabricated part 11 cast by UHPC material is relatively thick, and the U-shaped prefabricated part 11 has a bottom plate and a side plate, and the bottom plate and the side plate can be used as a template when pouring concrete; the number and form of the shear nails 13 must meet the shear requirements of the steel plate strips 122 and the U-shaped prefabricated part 11 to ensure that the strength and stiffness of the U-shaped prefabricated part 11 meet the requirements; the number of steel plate strips 122 in each U-shaped prefabricated part 11 and the thickness of the U-shaped prefabricated part 11 must meet the force requirements and deformation requirements of the U-shaped prefabricated part 11 during casting, and possible construction equipment and other loads during construction need to be considered.

[0042] Example 2 like Figure 6-Figure 8 As shown, a rigid frame includes a frame body 3 and a bottom template of a rigid frame of Example 1, wherein the frame body 3 is arranged in a groove on the top side of the U-shaped prefabricated part 11, and the frame body 3 is connected to the connecting component 12.

[0043] In one or more embodiments, the frame 3 includes a first lower chord tube 31, a second lower chord tube 32, a straight link 33 and an upper structure 34, one end of the straight link 33 is connected to the first lower chord tube 31, and the other end is connected to the second lower chord tube 32, the first lower chord tube 31 and the second lower chord tube 32 are parallel, the upper structure 34 is connected to the first lower chord tube 31, the upper structure 34 is connected to the second lower chord tube 32, the first lower chord tube 31, the second lower chord tube 32 and the straight link 33 are respectively connected to the connecting assembly 12; the first lower chord tube 31, the second lower chord tube 32 and the straight link 33 are respectively fixed to the stiffening rib 1 21, so that the frame 3 is fixed on the bottom template, the upper structure 34 includes an upper chord tube, a straight web and an oblique web, one end of the straight web is connected to the upper chord tube, and the other end is connected to the connecting component 12; the oblique web includes a first rod body and a second rod body, the two ends of the first rod body are respectively connected to the upper chord tube and the straight web, and the two ends of the second rod body are respectively connected to the straight web and the connecting component 12, the straight web plays a supporting role, so that the upper chord tube is fixed at a specified height, and a triangular structure is formed by the oblique web, thereby avoiding deformation at the connection between the straight web and the upper chord tube, and the straight web and the connecting component 12, thereby ensuring the structural stability of the rigid skeleton.

[0044] By adopting a bottom formwork of a rigid frame, the bottom formwork is connected to the frame 3 to form a rigid frame. When the rigid frame is poured, the bottom formwork and the poured concrete form a whole, which can avoid the installation and disassembly of the bottom formwork; save construction time, reduce construction difficulty, and ensure the safety of workers; by setting the frame 3 in the groove on the top side of the U-shaped prefabricated part 11, the frame 3 is easier to connect with the connecting component 12.

[0045] Specifically, the arch bridge skeleton formed by splicing multiple bottom formworks is composed of multiple bottom formworks spliced ​​together through on-site joints; the bottom formwork is composed of multiple prefabricated segments 1 connected in sequence, and adjacent prefabricated segments 1 are connected through factory joints 2; a frame 3 of a rigid frame is arranged on the top side of the bottom formwork, so that the frame 3 is connected to the bottom formwork to form an integral structure; the factory joints 2 are similar in structure to the on-site joints, and the prefabricated segments 1 are designed to be locally raised at the end and are provided with a toothed structure to enhance the bonding performance of the joints; both the factory joints 2 and the on-site joints are UHPC cast structural members, and the UHPC concrete used in the factory joints 2 and the on-site joints should be of a special ratio, and an expansion agent should be appropriately added to reduce the steaming time or not steam-curing; the frame 3 needs to reserve welding space with the stiffening ribs 121, and when welding, space needs to be reserved for the steel bars to penetrate into the steel bar holes 14 along the longitudinal direction.

[0046] Example 3 like Fig. 9 As shown, a construction method of a rigid frame, the construction method is used to construct a rigid frame as described in any one of claims 8-9, characterized in that it comprises the following steps: S1: Determine the prefabricated segment specifications: determine the size of the U-shaped prefabricated parts and the size of the connecting components; S2: Adjust the size of the prefabricated segment: construct a finite element model of the prefabricated segment with the size of the U-shaped prefabricated component and the size of the connecting component determined in S1, analyze the structural strength of the prefabricated segment with the finite element method, and adjust the U-shaped prefabricated component and the connecting component until the strength and stiffness of the prefabricated segment meet the requirements; S3: Design shear studs: design the number and size of shear studs based on the U-shaped prefabricated parts and connection component data adjusted in S2; obtain the design parameters of the prefabricated segment; S4: constructing the bottom formwork: manufacturing prefabricated segments according to the design parameters of S3, and splicing multiple prefabricated segments to form the bottom formwork; S5: Assembling the rigid frame: connecting the connection components on the bottom template with the frame of the rigid frame to form the rigid frame; S6: Splicing the arch bridge frame: The skeleton of the arch bridge is formed by hoisting and connecting several rigid frames.

[0047] The bottom formwork of the rigid frame is connected to the frame to form a whole, and the bottom formwork is made by fully utilizing the advantages of material stiffness and strength, replacing the traditional wooden formwork and steel formwork. During the hoisting process of the rigid frame, the bottom formwork is hoisted together with the frame of the rigid frame, so that the bottom formwork acts as a working platform, avoiding the disassembly of the bottom formwork after pouring is completed, thereby optimizing the operation process, reducing the risk of high-altitude operations for operators, and improving construction efficiency.

[0048] The specific implementation steps are: 1) According to the rigid skeleton layout and the size of the outer concrete, determine the size and structure of the steel strips; in order to make the force reasonable and save steel, the thickness of the designed steel strips can be 8mm; 2) Determine the thickness of the U-shaped prefabricated part according to the lifting weight of the segment; 3) Design the size of the stiffening ribs. The thickness of the stiffening ribs can be 10 mm. 4) Design the number of steel strips in the prefabricated segment; 5) Establish a finite element model to determine whether the strength and stiffness of the U-shaped prefabricated parts meet the requirements when casting the bottom plate. If not, adjust the design parameters of step 1) to step 4), such as increasing the number of steel strips, appropriately increasing the thickness of the bottom mold, etc.; 6) Determine the welding position and welding length of the stiffening rib and the frame of the rigid skeleton, and verify whether the force is sufficient. If not, adjust the welding length or weld size; 7) Determine the number and size of shear nails according to the structure of the rigid frame; 8) Manufacturing and processing steel laths and steel lath stiffeners in factories; 9) Weld shear nails and stiffening ribs on the steel strips; 10) Set up the formwork for the U-shaped prefabricated parts, arrange the steel slats, and pour the UHPC concrete; 11) Steam curing of U-shaped prefabricated parts; 12) After the frame assembly and welding of the rigid frame is completed, the frame of the rigid frame is hoisted to the designed position, the stiffening ribs and the direct web members are welded, and the stiffening ribs and the diagonal web members are welded to fix the frame of the rigid frame and the U-shaped prefabricated parts; 13) Casting factory joints between adjacent U-shaped prefabricated parts, the factory joints connect the adjacent U-shaped prefabricated parts to form a bottom formwork, and the bottom formwork is connected to the frame of the rigid frame to form a rigid frame; 14) Hoist the rigid frame into place and close the multiple sections of the rigid frame; 15) Casting on-site joints between rigid frames, the on-site joints connect adjacent rigid frames, and the on-site joints connect adjacent bottom formworks; 16) Insert steel bars into the steel bar holes and pour concrete into the groove on the top of the U-shaped prefabricated component to form a whole with the concrete and the U-shaped prefabricated component.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bottom template of a rigid skeleton, characterized in that: include If the prefabricated segment (1) is present, the prefabricated segment (1) is in the shape of a U-shaped through groove, and a plurality of the prefabricated segments (1) are connected end to end in sequence; The prefabricated segment (1) comprises a U-shaped prefabricated component (11) and a plurality of connection components (12), wherein the plurality of connection components (12) are arranged in a longitudinal direction in a groove on the top side of the U-shaped prefabricated component (11); The connection assembly (12) is provided with a plurality of shear nails (13) and a plurality of steel bar holes (14); the shear nails (13) are embedded in the U-shaped prefabricated component (11); the steel bar holes (14) are used for passing cast steel bars; and the connection assembly (12) is used for connecting a frame (3) of a rigid skeleton.

2. A bottom template of a rigid frame according to claim 1, characterized in that: The bottom formwork of the rigid frame further comprises a factory joint piece (2), and adjacent U-shaped prefabricated parts (11) are connected via the factory joint piece (2).

3. A bottom template of a rigid frame according to claim 2, characterized in that: Both ends of the U-shaped prefabricated component (11) are respectively provided with connection grooves (16), and the two opposite sides of the factory joint component (2) are respectively provided with connection protrusions (21), and the connection grooves (16) can be adapted to be connected with the connection protrusions (21).

4. The bottom template of a rigid frame according to claim 1, characterized in that: The U-shaped prefabricated component (11) is a UHPC structural component.

5. The bottom template of a rigid frame according to claim 1, characterized in that: The connection assembly (12) comprises a steel strip (122) and a stiffening rib (121), wherein the stiffening rib (121) is connected to the steel strip (122), the steel strip (122) is arranged in a transverse direction, a plurality of shear nails (13) are arranged in an array on the steel strip (122), the stiffening rib (121) is provided with a plurality of steel bar holes (14), and the stiffening rib (121) can be connected to a frame (3) of a rigid skeleton.

6. A bottom template of a rigid frame according to claim 5, characterized in that: The steel strip (122) and the stiffening rib (121) are both U-shaped structural members; the steel strip (122) is adaptively connected to the U-shaped prefabricated member (11); and the stiffening rib (121) is adaptively connected to the steel strip (122).

7. The bottom template of a rigid frame according to claim 5, characterized in that: The stiffening rib (121) is provided with a welding portion (15), and the welding portion (15) is used for welding and connecting with the frame body (3) of the stiff skeleton.

8. A rigid skeleton, characterized in that: It comprises a frame (3) and a bottom template of a rigid frame according to any one of claims 1 to 7, wherein the frame (3) is arranged in a groove on the top side of the U-shaped prefabricated component (11), and the frame (3) is connected to the connecting component (12).

9. A rigid skeleton according to claim 8, characterized in that: The frame (3) comprises a first lower chord tube (31), a second lower chord tube (32), a straight link (33) and an upper structure (34); one end of the straight link (33) is connected to the first lower chord tube (31), and the other end is connected to the second lower chord tube (32); the first lower chord tube (31) and the second lower chord tube (32) are parallel; the upper structure (34) is connected to the first lower chord tube (31); the upper structure (34) is connected to the second lower chord tube (32); the first lower chord tube (31), the second lower chord tube (32) and the straight link (33) are respectively connected to the connection assembly (12).

10. A method for constructing a rigid frame, the method being used to construct a rigid frame according to any one of claims 8 to 9, characterized in that: The following steps are involved: S1: Determine the prefabricated segment specifications: determine the size of the U-shaped prefabricated parts and the size of the connecting components; S2: Adjust the size of the prefabricated segment: construct a finite element model of the prefabricated segment with the size of the U-shaped prefabricated component and the size of the connecting component determined in S1, analyze the structural strength of the prefabricated segment with the finite element method, and adjust the U-shaped prefabricated component and the connecting component until the strength and stiffness of the prefabricated segment meet the requirements; S3: Design shear studs: design the number and size of shear studs based on the U-shaped prefabricated parts and connection component data adjusted in S2; obtain the design parameters of the prefabricated segment; S4: constructing the bottom formwork: manufacturing prefabricated segments according to the design parameters of S3, and splicing multiple prefabricated segments to form the bottom formwork; S5: Assembling the rigid frame: connecting the connection components on the bottom template with the frame of the rigid frame; S6: Splicing the arch bridge frame: The skeleton of the arch bridge is formed by hoisting and connecting several rigid frames.

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