Variable cross-section pier body reinforcing prefabricated jig frame

Abstract

The application relates to the technical field of bridge construction, and provides a variable cross-section pier body steel bar prefabrication jig. The variable cross-section pier body steel bar prefabrication jig comprises a plurality of vertical jigs arranged on the ground and at least one longitudinal fixed steel; the vertical jig at least comprises a lower tooth plate, a left tooth plate, a right tooth plate and an upper tooth plate; the lower tooth plate is vertically arranged on the ground; the left tooth plate and the right tooth plate are detachably arranged at the two end portions of the lower tooth plate; the two end portions of the upper tooth plate are detachably arranged at the upper end portions of the left tooth plate and the right tooth plate respectively; the lower tooth plate and the upper tooth plate each comprise a straight section and a circular arc section arranged at the two ends of the straight section; each circular arc section of the upper tooth plate is respectively connected with the upper end portion of the left tooth plate or the right tooth plate on the same side; and each circular arc section of the lower tooth plate is respectively connected with the lower end portion of the left tooth plate or the right tooth plate on the same side. The technical scheme provided by the application can gradually adjust the size of the prefabrication jig according to the change of the corresponding pier body height position.

Description

Technical Field

[0001] This application relates to the technical field of bridge construction, and more specifically, to a precast steel reinforcement frame for variable cross-section piers. Background Technology

[0002] The reinforcing cage portion of large columnar reinforced concrete components (such as pier segments) is typically prefabricated using a reinforcing steel binding jig. A conventional prefabricated reinforcing steel jig consists of multiple vertical toothed plate assemblies. Each toothed plate assembly forms the cross-sectional profile of a reinforcing cage. Each toothed plate assembly may include 2 to 4 different shaped toothed plates, depending on the cross-sectional profile. These shaped toothed plates are usually simply assembled based on the characteristics of the cross-sectional profile. For example, for a circular cross-section reinforcing cage, each toothed plate assembly consists of a left semi-circular shaped toothed plate and a right semi-circular shaped toothed plate; for a rectangular cross-section reinforcing cage, each toothed plate assembly consists of four straight toothed plates (top, bottom, left, and right); for an irregular cross-section reinforcing cage, several straight and curved toothed plates are assembled to form a pre-defined cross-sectional profile. The advantage of this segmented assembly is the high reusability of each toothed plate and the high possibility of repeated processing and reuse. However, the shaping effect at the joints of straight and curved toothed plates sometimes cannot meet higher engineering requirements. Summary of the Invention

[0003] To address the issue of poor applicability of existing precast jigs, this application provides a precast jig for variable cross-section pier reinforcement.

[0004] On the one hand, the precast steel frame for variable cross-section pier body provided in this application includes at least: a plurality of vertically arranged vertical frames on the ground and at least one longitudinal fixing steel; all the vertical frames are arranged in parallel along a straight line, and the longitudinal fixing steel is fixed to at least one side of the queue formed by all the vertical frames.

[0005] The vertical jig frame includes at least: a lower toothed plate, a left toothed plate, a right toothed plate, and an upper toothed plate;

[0006] The lower toothed plate is vertically set on the ground. The left toothed plate and the right toothed plate are detachably installed at both ends of the lower toothed plate. The two ends of the upper toothed plate are detachably installed at the upper ends of the left toothed plate and the right toothed plate, respectively. The lower toothed plate, the left toothed plate, the right toothed plate and the upper toothed plate form an adjustable closed toothed plate mold frame.

[0007] The left and right toothed plates are arc-shaped and curved inward. The lower and upper toothed plates each include a straight line segment and arc segments at both ends of the straight line segment. Each arc segment of the upper toothed plate is connected to the upper end of the left or right toothed plate on the same side. Each arc segment of the lower toothed plate is connected to the lower end of the left or right toothed plate on the same side.

[0008] In an optional embodiment, the outer edge of the upper toothed plate is aligned with the tangent direction at the joint of the upper ends of the left and right toothed plates, respectively.

[0009] The outer edge of the lower toothed plate is aligned with the tangent direction at the joint of the lower ends of the left and right toothed plates, respectively.

[0010] The outer edge of the upper toothed plate is formed by multiple continuous tooth-like structures of the arc segment of the upper toothed plate, and the outer edge of the lower toothed plate is formed by multiple continuous tooth-like structures of the arc segment of the lower toothed plate.

[0011] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement further includes: a toothed plate support member;

[0012] Two toothed plate supports are disposed at both ends of the lower toothed plate, and the left toothed plate and the right toothed plate are installed on the inner side of the two toothed plate supports. The distance between the left toothed plate and the right toothed plate is adjusted by the two toothed plate supports.

[0013] In an optional embodiment, the toothed plate support includes: a left support, a right support, and several pairs of support crossbars;

[0014] The support crossbars are symmetrically installed on the left and right support members, and the left and right toothed plates are installed on the inner side of the left or right support member respectively via the support crossbars on the same side.

[0015] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement further includes: a transverse load-bearing bar;

[0016] The transverse load-bearing rod is installed below the lower toothed plate and is parallel to the lower toothed plate;

[0017] The left and right support members are located at the two ends of the transverse load-bearing rod.

[0018] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement further includes: a top hanger, which is suspended above the upper toothed plate;

[0019] The two ends of the top suspension rod are respectively installed and connected to the upper ends of the left support and the right support.

[0020] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement further includes: a pair of movable flanges;

[0021] The movable flange is installed at the upper ends of the left and right support members, and the two ends of the top hanger are respectively installed and connected to the upper ends of the left and right support members through the movable flange.

[0022] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement further includes: top slings;

[0023] The top sling suspends the upper toothed plate below the top sling.

[0024] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement further includes: at least one pair of lifting lugs;

[0025] The lugs are symmetrically fixed to the top suspension rod.

[0026] In an optional embodiment, the precast frame for the variable cross-section pier reinforcement has a left toothed plate and a right toothed plate that are symmetrically arranged in an arc shape.

[0027] The precast steel reinforcement frame for variable cross-section piers provided in this application has the following advantages:

[0028] (1) The precast frame for the variable cross-section pier steel reinforcement of this application includes a straight section and an arc section at both ends of the upper and lower toothed plates, respectively, so that a complete steel bar can be bent to form a preset outline shape, avoiding the structural weakness of forming a steel mesh by welding at the bend. Although the manufacturing cost of the toothed plate is increased, it can meet the engineering requirements.

[0029] (2) The precast frame for the variable cross-section pier reinforcement of this application uses the arc-shaped left toothed plate and right toothed plate to connect the two ends of the upper toothed plate and the lower toothed plate respectively. The smooth transition of the arc-shaped connection is easier and less prone to errors.

[0030] (3) The precast frame for the variable cross-section pier reinforcement in this application transfers the connection point of the reinforcement to the middle of the straight section or the middle of the arc section, which reduces the accuracy requirements of welding, can effectively speed up the work, and also avoids the structural weakness of the reinforcement mesh.

[0031] (4) The precast frame for variable cross-section pier reinforcement of this application can be applied to the construction of variable cross-section pier columns. If the preset angles defined by the upper and lower toothed plates remain unchanged, the precast frame can be gradually adjusted by adjusting the length of the straight section and the curvature of the left and right toothed plates to form a steel cage with different cross-sectional profiles.

[0032] Additional aspects and advantages of this application will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice. Attached Figure Description

[0033] The above and / or additional aspects and advantages will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1A schematic diagram of the structure of a vertical precast frame for variable cross-section pier reinforcement provided in one embodiment of this application;

[0035] Figure 2 An exploded structural diagram of a vertical frame for a precast steel reinforcement frame for a variable cross-section pier body, provided as an embodiment of this application. Detailed Implementation

[0036] The present application will now be further described with reference to the accompanying drawings and exemplary embodiments, wherein all like reference numerals in the drawings refer to the same parts. Furthermore, detailed descriptions of known technologies that are unnecessary to illustrate the features of the present application are omitted.

[0037] To address the problem of accurately controlling the connection and installation angle between the toothed plates of existing variable cross-section pier steel precast jigs, this application provides a variable cross-section pier steel precast jig.

[0038] The precast steel reinforcement frame for the variable cross-section pier body includes at least: a vertical frame 100 and at least one longitudinal fixing steel (not shown in the figure).

[0039] The vertical frame 100 is perpendicular to the ground. Any two vertical frames 100 are parallel to each other. The line connecting the center points of each vertical frame 100 is a straight line. All vertical frames 100 are arranged along this straight line to form a queue of vertical frames 100.

[0040] The longitudinal fixing steel is fixed to at least one side of the queue, ensuring that each vertical jig 100 in the queue can be arranged in a straight line.

[0041] refer to Figure 1-2 , Figure 1 A schematic diagram of the structure of a vertical precast frame for variable cross-section pier reinforcement provided in one embodiment of this application; Figure 2 An exploded structural diagram of a vertical frame for a precast steel reinforcement frame for a variable cross-section pier body, provided as an embodiment of this application.

[0042] Each vertical jig 100 includes at least: a lower toothed plate 101, a left toothed plate 102, a right toothed plate 103, and an upper toothed plate 104.

[0043] The lower toothed plate 101 is vertically mounted on the ground. It can be placed directly on the ground by means of a base portion that has been widened in length, or it can be perpendicular to the ground by means of other connecting parts. In this embodiment, for example... Figure 1As shown, a horizontal load-bearing rod 120 parallel to each lower toothed plate 101 is installed below it. This rod serves to ensure that the lower toothed plate 101 is perpendicular to the ground and also to support the weight and fix the position of the entire connected vertical frame 100. The horizontal load-bearing rod 120 is installed and connected to the lower toothed plate 101 through several connectors, so that the lower toothed plate 101 and the connected vertical frame 100 are perpendicular to the current position.

[0044] In this embodiment, a left toothed plate 102 and a right toothed plate 103 are respectively installed at both ends of the lower toothed plate 101. The left toothed plate 102 and the right toothed plate 103 are detachable, and their installation positions on the lower toothed plate 101 can be adjusted. Specifically, the installation distance between the left toothed plate 102 and the right toothed plate 103 on the lower toothed plate 101 is adjusted according to the cross-sectional dimensions of the corresponding height position of the pier body. For example, if the height position corresponding to the pier body is the top, the distance between the left toothed plate 102 and the right toothed plate 103 of the corresponding vertical jig 100 is smaller than that of the vertical jig 100 located at the bottom of the pier body. Therefore, in this embodiment, the installation distance between the left toothed plate 102 and the right toothed plate 103 on the lower toothed plate 101 can be adjusted according to the cross-sectional dimensions of the pier body at the height position corresponding to the vertical jig 100, resulting in a precast steel reinforcement jig suitable for pier bodies of different sizes.

[0045] An upper toothed plate 104 is provided above the left toothed plate 102 and the right toothed plate 103. The upper ends of the left toothed plate 102 and the right toothed plate 103 are respectively installed and connected to the two ends of the upper toothed plate 104. The specific installation position of the upper toothed plate 104 and the left toothed plate 102 and the right toothed plate 103 is determined according to the pier body size at the corresponding height position of the vertical jig 100.

[0046] For a vertical support frame 100, the left toothed plate 102 and right toothed plate 103 are arc-shaped and curved inward, that is, curved inward according to the contour of the pier. The lower toothed plate 101 and upper toothed plate 104 each include a straight line segment and arc segments at both ends, which are also curved inward according to the contour of the pier. The aforementioned arc segment refers to multiple continuous tooth-like structures on a toothed plate arranged to form an arc shape.

[0047] For the lower toothed plate 101 or the upper toothed plate 104, the corresponding straight segment and the arc segments at both ends form an angle, creating an embracing shape around the pier body. This arc segment extends according to the pier's contour to the upper or lower end of the left toothed plate 102 or the right toothed plate 103 on the same side, and connects there. For example... Figure 2As shown, the left end A1 of the lower toothed plate 101 is connected to the lower end A2 of the left toothed plate 102; the left end B1 of the lower toothed plate 101 is connected to the lower end B2 of the right toothed plate 103; the left end C1 of the upper toothed plate 102 is connected to the upper end C2 of the left toothed plate 102; and the right end D1 of the upper toothed plate 102 is connected to the upper end D2 of the right toothed plate 103. Based on the above connection relationships, the lower toothed plate 101, left toothed plate 102, right toothed plate 103, and upper toothed plate 104 form a toothed ring structure corresponding to the cross-section of the reinforcing cage at the pier height position, as shown. Figure 1 As shown.

[0048] Based on the above embodiments of this application, since both the lower toothed plate and the upper toothed plate include a straight line segment and arc segments at both ends, a complete steel bar can be bent to form a preset contour shape, avoiding the structural weakness of forming a steel mesh by welding at the bend. Although this increases the manufacturing cost of the toothed plate, it can meet the engineering requirements.

[0049] Furthermore, the precast steel frame for the variable cross-section pier body uses arc-shaped left and right toothed plates to connect the two ends of the upper and lower toothed plates respectively. The smooth transition of the arc-shaped connection is easier and less prone to errors.

[0050] Furthermore, the prefabricated steel reinforcement frame for the variable cross-section pier body shifts the connection point of the steel reinforcement to the middle of the straight section or the middle of the arc section, reducing the precision requirements of welding, effectively speeding up the work, and avoiding structural weaknesses in the steel mesh.

[0051] Furthermore, when this precast steel reinforcement frame for variable cross-section piers is applied to the construction of variable cross-section piers, if the preset angles defined by the upper and lower toothed plates remain unchanged, steel cages with different cross-sectional profiles can be formed by adjusting the length of the straight segments and the curvature of the left and right toothed plates, thus achieving a gradual adjustment of the precast frame.

[0052] In this application, the toothed structures of the lower toothed plate 101, left toothed plate 102, right toothed plate 103, and upper toothed plate 104 are all disposed on the inner side. For any of the toothed plate structures described above, the line connecting the outer edges formed by multiple consecutive toothed structures constitutes the outer edge of the toothed plate structure. In this embodiment, the outer edge of the upper toothed plate 104 is aligned with the tangent direction at the joint of the upper ends of the left toothed plate 102 and the right toothed plate 103, and the outer edge of the lower toothed plate 101 is aligned with the tangent direction at the joint of the lower ends of the left toothed plate 102 and the right toothed plate 103. Specifically, the outer edges of the two arc segments of the upper toothed plate 104 are aligned with the tangent directions at the joints of the upper ends of the left toothed plate 102 and the right toothed plate 103, respectively. The outer edges of the two arc segments of the lower toothed plate 101 are aligned with the tangent directions at the joints of the lower ends of the left toothed plate 102 and the right toothed plate 103, respectively. That is, the tangent directions of the lower toothed plate 101 at points A1 and B1 are aligned with the tangent directions of the lower ends of the left toothed plate 102 (A2) and the right toothed plate 103 (B2), respectively. The tangent directions of the upper toothed plate 104 at points C1 and D1 are aligned with the tangent directions of the upper ends of the left toothed plate 102 (C2) and the right toothed plate 103 (D2), respectively. This ensures that the lower toothed plate 101 and the upper toothed plate 104 can be precisely joined with the upper and lower ends of the left toothed plate 102 and the right toothed plate 103, respectively, which is beneficial for the positioning of the reinforcing bars and the binding of the reinforcing cage in the later stages.

[0053] For the lower toothed plate 101 and the upper toothed plate 104, the dimensions and bending angles and amplitudes of their respective straight segments and the arc segments at their ends, as well as the corresponding lengths, bending angles, and amplitudes of the left toothed plate 102 and the right toothed plate 103, are all set according to the cross-sectional dimensions of the reinforcing cage at the corresponding pier height position. The connection points between the left toothed plate 102 and the right toothed plate 103 and the lower toothed plate 101 and the upper toothed plate 104, respectively, can be adjusted by changing the distance between the left toothed plate 102 and the right toothed plate 103, or by replacing at least one toothed plate structure of the lower toothed plate 101, the left toothed plate 102, the right toothed plate 103, and the upper toothed plate 104 of different sizes to adapt to the gradual adjustment of the precast jig dimensions.

[0054] In the closed toothed plate mold frame of this embodiment, the tooth-like structures of the lower toothed plate 101, left toothed plate 102, right toothed plate 103 and upper toothed plate 104 all extend into the inner side of the closed toothed plate mold frame. When the vertical mold frame 100 is subsequently dismantled, each toothed plate is moved one by one in the direction of dismantling, which helps to reduce the difficulty of dismantling.

[0055] A reinforcing bar groove is formed between two adjacent tooth-like structures. This reinforcing bar groove is used to place the reinforcing bar to be tied, and the reinforcing bar is fixed to the reinforcing bar groove of each vertical jig 100 by means such as welding, so as to standardize the position of the reinforcing bar and the distance between the reinforcing bars, and further reduce the difficulty of the subsequent removal of the reinforcing bar cage from the vertical jig 100.

[0056] refer to Figure 1 In this embodiment, a toothed plate support member 110 is connected to each of the two ends of the lower toothed plate 101, and to the outer sides of the left toothed plate 102 and the right toothed plate 103. The toothed plate support member 110 is a structure that connects the corresponding left toothed plate 102 or right toothed plate 103, and is used to reinforce the vertical structure formed by the left toothed plate 102 and right toothed plate 103 and the lower toothed plate 101, so as to enhance the structural stability of the entire vertical frame 100.

[0057] In addition, the toothed plate support 110 plays a role in adjusting the position of the left toothed plate 102 and the right toothed plate 103 connected to each other. Specifically, by adjusting the positional relationship between the toothed plate support 110 and the lower toothed plate 101, the precast steel reinforcement vertical frame 100 located at different pier heights can be obtained.

[0058] Furthermore, the toothed plate support 110 includes a left support 111, a right support 112, and several pairs of support crossbars 113. Each pair of support crossbars 113 is installed at the same height on the left support 111 and the right support 112, with one end of the support crossbar 113 clamped on the left support 111 or the right support 112, and the other end connected to the left toothed plate 102 or the right toothed plate 103 located inside the toothed plate support 110, so that the left toothed plate 102 and the right toothed plate 103 can be pushed towards the center of the vertical frame 100 or moved to both sides of the vertical frame 100 as the corresponding left support 111 or right support 112 moves.

[0059] In this embodiment, the left toothed plate 102 and the right toothed plate 103 are both mounted on the left support member 111 or the right support member 112 on the same side by a number of support crossbars 113. The number of support crossbars 113 acting on the connected left toothed plate 102 or right toothed plate 103 by the left support member 111 or the right support member 112 is the same and the height position of the support member is the same, so that the left toothed plate 102 and the right toothed plate 103 are subjected to the same force by the support crossbars 113, and are symmetrical to each other in the left and right directions.

[0060] like Figure 1 , 2 As shown, four L-shaped clamping plates are fixed to both the upper and lower sides of the support crossbar 113 mounted on the left support member 111 or the right support member 112, forming a "well"-shaped clamping structure. Within this clamping structure, the support crossbar 113 can extend and retract perpendicular to the extending direction of the left support member 111 or the right support member 112. Therefore, based on the clamping structure connecting the support crossbar 113 to the left support member 111 or the right support member 112 in this embodiment, the left toothed plate 102 and the right toothed plate 103 can move relative to the left support member 111 or the right support member 112 as the connected support crossbar 113 moves, thus advancing or shifting with the lower toothed plate 101.

[0061] In another embodiment, the left toothed plate 102 and right toothed plate 103 can be advanced or moved relative to the lower toothed plate 101 by means of mutual displacement between the left support member 111 or the right support member 112 and the transverse load-bearing rod 120. In this embodiment, the left support member 111 and right support member 112 are respectively installed and connected to the two ends of the transverse load-bearing rod 120. Slide grooves (not shown) can be provided at both ends of the transverse load-bearing rod 120. These slide grooves provide the left support member 111 and right support member 112 with moving guides to advance or move the connected left toothed plate 102 and right toothed plate 103 relative to the lower toothed plate 101, thereby reducing the difficulty of adjusting the distance between the left toothed plate 102 and right toothed plate 103. This ensures that the adjustment operation of the closed toothed plate formwork of each vertical jig 100 can still maintain adjustment accuracy while reducing the operational requirements for construction personnel.

[0062] Based on the toothed plate support 110, which includes a left support 111, a right support 112, and several pairs of support crossbars 113, the prefabricated jig also includes a top suspension rod 130. The top suspension rod 130 is suspended above the upper toothed plate 104. In this embodiment, in a closed toothed plate mold frame, the upper toothed plate 104 is parallel to the lower toothed plate 101.

[0063] Furthermore, a top sling 131 is provided between the upper toothed plate 104 and the top suspension rod 130. The upper toothed plate 104 is suspended below the top suspension rod 130 by the top sling 131. Figure 1 , 2 As shown, the top sling 131 includes at least one pair of top slings 131, which are symmetrically and vertically suspended between the upper toothed plate 104 and the top suspension rod 130 to better balance and adjust the position of the upper toothed plate 104, facilitating the smooth assembly and disassembly of the vertical jig 100. In this embodiment, a connecting rod 132 is fixed on the upper toothed plate 104, which is used to directly connect to the top slings 131.

[0064] The top hanger 130 is located above the left and right toothed plates 102, the left support 111, and the right support 112. In this embodiment, for a complete closed toothed plate mold frame, the two ends of the upper toothed plate 104 are detachably mounted on the upper ends of the two left and right toothed plates 102, respectively. During the installation of the vertical jig 100, the top hanger 130 is used to assist the upper toothed plate 104 in aligning with the two left and right toothed plates 102 at the installation position.

[0065] At the outer position of the closed toothed plate mold frame formed after the upper toothed plate 104 is joined with the two left toothed plates and the right toothed plate 102, the two ends of the top hanger 130 are respectively installed and connected to the upper ends of the left support member 111 and the right support member 112. Figure 2As shown, in this embodiment, both ends of the top hanger 130 are L-shaped structures, which are respectively connected to the upper ends of the left support member 111 and the right support member 112. Further, the connection structure is a pair of movable flanges 134. These movable flanges 134 temporarily lock the two ends of the top hanger 130 to the upper ends of the left support member 111 and the right support member 112, thereby enhancing the stability of the entire vertical support frame 100.

[0066] At least one pair of lifting lugs 133 may be further provided on the top lifting rod 130. The lifting lugs 133 can be used to install or separate the upper toothed plate 104 from the two left toothed plates and the right toothed plate 102 by directly lifting the top lifting rod 130, thereby completing the assembly and disassembly process of the vertical jig 100.

[0067] The longitudinal fixing steel can be vertically connected to the upper toothed plate 104 of all vertical jigs 100. Furthermore, the longitudinal fixing steel is fixed at the midpoint of each upper toothed plate 104.

[0068] In the embodiment where the upper toothed plate 104 is fixed below the top hanger 130, the longitudinal fixing steel is fixed at the midpoint of each top hanger 130.

[0069] If the number of longitudinal fixing steel bars is even, they are vertically connected to the left toothed plate 102 and right toothed plate 103 of all vertical brackets 100. Furthermore, the at least two longitudinal fixing steel bars are fixed at the same height on the left toothed plate 102 and right toothed plate 103. Specifically, the even number of longitudinal fixing steel bars are vertically connected to the left support member 111 and right support member 112 of all vertical brackets 100. Moreover, the at least two longitudinal fixing steel bars are fixed at the same height on the left support member 111 and right support member 112.

[0070] The multiple vertical support frames 100 of this application are precast steel reinforcement support frames formed by the connection of longitudinally fixed steel bars. They can be flexibly applied to precast steel reinforcement support frames for different piers, which helps to improve the construction efficiency of steel reinforcement binding technology.

[0071] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A precast steel reinforcement frame for a variable cross-section pier, characterized in that, At least including: A plurality of vertically arranged upright jigs on the ground and at least one longitudinal fixing steel; all the upright jigs are arranged in parallel along a straight line, and the longitudinal fixing steel is fixed to at least one side of the queue formed by all the upright jigs; The vertical jig frame includes at least: a lower toothed plate, a left toothed plate, a right toothed plate, and an upper toothed plate; The lower toothed plate is vertically set on the ground. The left toothed plate and the right toothed plate are detachably installed at both ends of the lower toothed plate. The two ends of the upper toothed plate are detachably installed at the upper ends of the left toothed plate and the right toothed plate, respectively. The lower toothed plate, the left toothed plate, the right toothed plate and the upper toothed plate form an adjustable closed toothed plate mold frame. The left and right toothed plates are arc-shaped and curved inward. The lower and upper toothed plates each include a straight line segment and arc segments at both ends of the straight line segment. Each arc segment of the upper toothed plate is connected to the upper end of the left or right toothed plate on the same side. Each arc segment of the lower toothed plate is connected to the lower end of the left or right toothed plate on the same side. The outer edge of the upper toothed plate is aligned with the tangent direction at the joint of the upper ends of the left and right toothed plates, respectively; the outer edge of the lower toothed plate is aligned with the tangent direction at the joint of the lower ends of the left and right toothed plates, respectively. It also includes toothed plate supports; two toothed plate supports are disposed at both ends of the lower toothed plate, the left toothed plate and the right toothed plate are installed on the inner side of the two toothed plate supports, and the distance between the left toothed plate and the right toothed plate is adjusted by the two toothed plate supports; A top suspension rod is suspended above the upper toothed plate, and the two ends of the top suspension rod are respectively connected to the upper ends of the left support and the right support. A pair of movable flanges are installed at the upper ends of the left and right support members, and the two ends of the top hanger are respectively connected to the upper ends of the left and right support members through the movable flanges; Based on the cross-sectional dimensions of the pier body at the height position corresponding to the vertical jig, the distance between the installation positions of the left toothed plate and the right toothed plate on the lower toothed plate is adjusted to obtain a precast steel jig suitable for pier bodies of different sizes.

2. The precast steel reinforcement frame for variable cross-section pier body according to claim 1, characterized in that, The outer edge of the upper toothed plate is formed by multiple continuous tooth-like structures of the arc segment of the upper toothed plate, and the outer edge of the lower toothed plate is formed by multiple continuous tooth-like structures of the arc segment of the lower toothed plate.

3. The precast steel reinforcement frame for variable cross-section pier body according to claim 1, characterized in that, The toothed plate support includes: a left support, a right support, and several pairs of support crossbars; The support crossbars are symmetrically installed on the left and right support members, and the left and right toothed plates are installed on the inner side of the left or right support member respectively via the support crossbars on the same side.

4. The precast steel reinforcement frame for variable cross-section pier body according to claim 3, characterized in that, Also includes: Horizontal load-bearing bar; The transverse load-bearing rod is installed below the lower toothed plate and is parallel to the lower toothed plate; The left and right support members are located at the two ends of the transverse load-bearing rod.

5. The precast steel reinforcement frame for variable cross-section pier body according to claim 1, characterized in that, Also includes: Top slings; The top sling suspends the upper toothed plate below the top sling.

6. The precast steel reinforcement frame for variable cross-section pier body according to claim 1, characterized in that, Also includes: At least one pair of lugs; The lugs are symmetrically fixed to the top suspension rod.

7. The precast steel reinforcement frame for variable cross-section pier body according to claim 1, wherein the left toothed plate and the right toothed plate are mutually symmetrical arc-shaped toothed plates.

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