A vertical prestressed steel bar tensioning notch reserved box and its installation method

Abstract

The present application discloses a vertical prestressed steel bar tensioning notch reserved box and an installation method thereof, relating to the technical field of vertical prestressed steel bar tensioning. A vertical prestressed steel bar tensioning notch reserved box includes a steel box body and a steel hanging ear; the steel box body includes a bottom plate and a circle of side plates arranged on the bottom plate, and prestressed steel bar positioning holes are arranged on the bottom plate; the steel hanging ear includes a support rod and a hanging rod arranged above the support rod, both ends of the support rod are respectively connected with both ends of the hanging rod, and a hanging hole is formed between the support rod and the hanging rod; the support rod straddles the inner cavity of the steel box body, and both ends thereof are fixedly connected with the side plates. By setting the steel box body and the steel hanging ear, the present application improves the overall stiffness of the reserved box, not only solves the problems of poor stiffness and easy deformation of the existing wooden formwork, but also can be reused.

Description

Technical Field

[0001] This application relates to the technical field of vertical prestressed steel bar tensioning, and particularly relates to a reserved box for vertical prestressed steel bar tensioning notch and an installation method thereof. Background Art

[0002] The application of vertical prestressed steel bars in large concrete bridges is relatively common. At present, vertical prestressed steel bars are all post-tensioned, and tensioning notches need to be reserved before pouring concrete.

[0003] During the construction of existing large concrete bridges, most of them use the method of assembling wooden formworks to pour the tensioning notches. However, this method has the following deficiencies: 1. The stiffness of the wooden formwork is poor and it is easy to deform. During the concrete vibration process, the wooden formwork is prone to deviation or damage, resulting in the inability to guarantee the size of the reserved tensioning notch, which in turn affects the subsequent tensioning quality of the prestressed steel bars; 2. Most wooden formworks are disposable and cannot be reused. Summary of the Invention

[0004] The purpose of this application is to provide a reserved box for vertical prestressed steel bar tensioning notch and an installation method thereof, so as to solve the problems of poor stiffness and easy deformation of the existing wooden formwork.

[0005] The technical solution adopted by this application to solve its technical problems is:

[0006] A reserved box for vertical prestressed steel bar tensioning notch includes a steel box body and a steel hanging ear; the steel box body includes a bottom plate and a circle of side plates arranged on the bottom plate, and prestressed steel bar positioning holes are arranged on the bottom plate; the steel hanging ear includes a support rod and a hanging rod arranged above the support rod, both ends of the support rod are respectively connected to both ends of the hanging rod, and a hanging hole is formed between the support rod and the hanging rod; the support rod straddles the inner cavity of the steel box body, and both ends of it are fixedly connected to the side plates.

[0007] Further, a part of the hanging rod is arranged inside the steel box body, and the part of the hanging rod located inside the steel box body is attached to and fixedly connected to the inner surface of the side plate.

[0008] Further, the hanging rod includes a top hanging section and hanging reinforcement sections connected to both ends of the top hanging section and extending downward into the steel box body; the lower ends of the two hanging reinforcement sections are respectively connected to both ends of the support rod, and the hanging reinforcement sections are attached to and fixedly connected to the inner surface of the side plate.

[0009] Further, the top hanging section is an upwardly convex arc or an inverted U shape.

[0010] Further, the side plate includes four side vertical plates connected in sequence end to end, and the lower ends of the side vertical plates are connected to the bottom plate.

[0011] Further, both the side vertical plate and the bottom plate are of planar structure, and the included angle between the inner surface of the side vertical plate and the upper surface of the bottom plate is β, where 90° ≤ β ≤ 100°.

[0012] Further, where β = 95°.

[0013] Further, the thickness of the side vertical plate is 10 mm, and the thickness of the bottom plate is 10 mm.

[0014] Further, three prestressed steel bar positioning holes are arranged at intervals on the bottom plate along the first direction.

[0015] Further, the number of the steel hanging ears is two, and the two steel hanging ears are arranged at intervals along the first direction.

[0016] An installation method of a vertical prestressed steel bar tensioning notch reserved box includes the following steps: providing a vertical prestressed steel bar tensioning notch reserved box, placing the bottom plate of the steel box body on a positioning support plate on the vertical prestressed steel bar, and enabling the upper end of the vertical prestressed steel bar to pass through the prestressed steel bar positioning hole of the bottom plate, and screwing a nut onto the vertical prestressed steel bar and tightening it.

[0017] Advantages of the present application:

[0018] A vertical prestressed steel bar tensioning notch reserved box and an installation method thereof provided by an embodiment of the present application improve the overall stiffness of the reserved box by arranging a steel box body and steel hanging ears, not only solve the problems of poor stiffness and easy deformation of the existing wooden formwork, but also can be reused. By arranging the support rod of the steel hanging ear across the inner cavity of the steel box body and fixedly connecting it with the side plate, the support rod of the steel hanging ear can be used to strengthen the steel box body, further improving the strength and stiffness of the steel box body. When meeting the design requirements of strength and stiffness, the thickness of the steel box body can be reduced, achieving the purpose of saving manufacturing costs. Description of the drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1Schematic diagram of the vertical prestressed steel bar tensioning notch reserved box provided by the embodiment of the present application;

[0021] Figure 2 is Figure 1 Cross-sectional view along line A-A in

[0022] Figure 3 is Figure 1 Top view of

[0023] Figure 4 Schematic diagram of the structure of the steel hanging ear;

[0024] Figure 5 Schematic diagram of the structure of the side vertical plate;

[0025] Figure 6 Schematic diagram of the structure in which the vertical prestressed steel bar tensioning notch reserved box provided by the embodiment of the present application is connected to the prestressed steel bar.

[0026] Reference numerals:

[0027] 1 - Steel box body; 11 - Bottom plate; 12 - Side plate; 121 - Side vertical plate; 13 - Prestressed steel bar positioning hole;

[0028] 2 - Steel hanging ear; 21 - Support rod; 22 - Hanging rod; 221 - Top hanging section; 222 - Hanging strengthening section; 23 - Hanging hole;

[0029] 3 - Vertical prestressed steel bar. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

[0031] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. And without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0032] In the description of the embodiments of the present application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this application is in its usual placement, or the orientation or positional relationship commonly understood by those skilled in the art. The terms "set", "provided with", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection and an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components.

[0033] See Figure 1 、 Figure 2 、 Figure 3 In an embodiment of the present application, a vertical prestressed steel bar tensioning notch reserved box is provided, which includes a steel box body 1 and a steel hanging ear 2; the steel box body 1 includes a bottom plate 11 and a circle of side plates 12 arranged on the bottom plate 11, and prestressed steel bar positioning holes 13 are arranged on the bottom plate 11; the steel hanging ear 2 includes a support rod 21 and a hanging rod 22 arranged above the support rod 21. The two ends of the support rod 21 are respectively connected to the two ends of the hanging rod 22, and a hanging hole 23 is formed between the support rod 21 and the hanging rod 22; the support rod 21 straddles the inner cavity of the steel box body 1, and its two ends are fixedly connected to the side plates 12.

[0034] Both the steel box body 1 and the steel hanging ear 2 are made of steel materials, which greatly improves the strength and stiffness compared with the wooden formwork. For example, the steel box body 1 can be spliced by steel plates, and the steel hanging ear 2 can be processed by steel plates or bent by steel bars.

[0035] The steel box body 1 is a top-opening structure, including a horizontally arranged bottom plate 11 and a circle of side plates 12 fixed on the bottom plate 11. Prestressed steel bar positioning holes 13 for the vertical prestressed steel bars 3 to pass through are arranged on the bottom plate 11. The number of prestressed steel bar positioning holes 13 on the bottom plate 11 can be one, two or more than two, and no specific limitation is made here. For example, see Figure 3 As shown in the figure, three prestressed steel bar positioning holes 13 are arranged at intervals along the first direction on the bottom plate 11, where the first direction can be any direction parallel to the plate surface of the bottom plate 11.

[0036] The steel hanging ear 2 includes a support rod 21 and a hanging rod 22. The hanging rod 22 is arranged above the support rod 21, and the two ends of the hanging rod 22 are respectively connected to the two ends of the support rod 21, so that a hanging hole 23 is formed between the hanging rod 22 and the support rod 21. Among them, the support rod 21 straddles the inner cavity of the steel box body 1, and the two ends of the support rod 21 are respectively fixedly connected to the side plates 12 of the steel box body 1, so that the side plates 12 of the steel box body 1 are supported and strengthened by the support rod 21, further improving the strength and stiffness of the steel box body 1. The number of steel hanging ears 2 can be one or two. For example, see Figure 1 、 Figure 3 As shown in the figure, the number of steel hanging ears 2 is two, and the two steel hanging ears 2 are arranged at intervals along the first direction; the projection of each steel hanging ear 2 on the bottom plate 11 is located between two adjacent prestressed steel bar positioning holes 13.

[0037] A vertical prestressed steel bar tensioning notch reserved box provided by an embodiment of the present application improves the overall stiffness of the reserved box by setting a steel box body 1 and a steel hanging ear 2. It not only solves the problems of poor stiffness and easy deformation of the existing wooden formwork, but also can be reused. By arranging the support rod 21 of the steel hanging ear 2 across the inner cavity of the steel box body 1 and fixedly connecting it to the side plate 12, the steel box body can be strengthened by using the support rod 21 of the steel hanging ear 2, further improving the strength and stiffness of the steel box body 1. Under the condition of meeting the design requirements of strength and stiffness, the thickness of the steel box body 1 can be reduced to achieve the purpose of saving manufacturing costs.

[0038] To further improve the strength and stiffness of the steel box body 1, refer to Figure 2 , a part of the hanging rod 22 is arranged inside the steel box body 1, and the part of the hanging rod 22 located inside the steel box body 1 is attached to and fixedly connected to the inner surface of the side plate 12. By attaching and fixedly connecting a part of the hanging rod 22 to the inner surface of the side plate 12, not only can the strength and stiffness of the side plate 12 be increased by using the hanging rod 22, but also the connection length between the steel hanging ear 2 and the steel box body 1 can be increased, improving the firmness of the connection between the steel hanging ear 2 and the steel box body 1.

[0039] Exemplarily, refer to Figure 4 , the hanging rod 22 includes a top hanging section 221 and hanging strengthening sections 222 connected to both ends of the top hanging section 221 and extending downward into the steel box body 1; the lower ends of the two hanging strengthening sections 222 are respectively connected to both ends of the support rod 21, and the hanging strengthening section 222 is attached to and fixedly connected to the inner surface of the side plate 12. Among them, the top hanging section 221 is an upward convex arc or an inverted U shape. Of course, the top hanging section 221 can also be of other shapes, which are not specifically limited here. The steel hanging ear 2 can be formed by bending a φ25mm steel bar, and the steel hanging ear 2 and the steel box body 1 are fixedly connected by welding.

[0040] The outer shape of a circle of side plates 12 can be cylindrical, prismatic, frustum-shaped with a larger upper part and a smaller lower part, or frustum-shaped with a larger upper part and a smaller lower part, etc. Exemplarily, the side plate 12 includes four side vertical plates 121 connected end to end in sequence, and the lower end of the side vertical plate 121 is connected to the bottom plate 11. For example, both the side vertical plate 121 and the bottom plate 11 are planar structures, and the bottom plate 11 is rectangular; the side vertical plate 121 and the bottom plate 11 can be made of 10-mm thick steel plates, and the side vertical plate 121 and the side vertical plate 121, as well as the side vertical plate 121 and the bottom plate 11, are fixedly connected by welding. Two of the four side vertical plates 121 are arranged opposite to each other, and the two side vertical plates 121 of the first group arranged opposite to each other are respectively fixedly connected to the two long sides of the bottom plate 11, and the two side vertical plates 121 of the second group arranged opposite to each other are respectively fixedly connected to the two short sides of the bottom plate 11. Among them, the first direction is parallel to the length direction of the bottom plate 11, and both ends of the support rod 21 are fixedly connected to the two side vertical plates 121 of the first group arranged opposite to each other, and the two hanging reinforcement sections 222 are respectively attached to and fixedly connected to the inner surfaces of the two side vertical plates 121 of the first group arranged opposite to each other.

[0041] In order to easily remove the reserved box after pouring concrete, refer to Figure 2 , the included angle between the inner surface of the side vertical plate 121 and the upper surface of the bottom plate 11 is β, where 90° ≤ β ≤ 100°. In this way, the overall outer shape of the steel box body 1 is a structure with a larger upper part and a smaller lower part, which is convenient for easily removing the reserved box after pouring concrete. In this embodiment, β = 95°. Refer to Figure 5 , the side vertical plate 121 is an isosceles trapezoid structure with a longer upper base side and a shorter lower base side, where the included angle between BC and CD is β.

[0042] Refer to Figure 6 , the embodiment of the present application provides an installation method for a vertical prestressed steel bar tensioning notch reserved box, including the following steps: providing the vertical prestressed steel bar tensioning notch reserved box in the above embodiment, placing the bottom plate 11 of the steel box body 1 on the positioning support plate 31 on the vertical prestressed steel bar 3, and passing the upper end of the vertical prestressed steel bar 3 through the prestressed steel bar positioning hole 13 of the bottom plate 11, and threadedly connecting the nut 4 to the vertical prestressed steel bar 3 and tightening it.

[0043] After the reserved box is installed, the reserved box is fixed on the vertical prestressed steel bar 3 through the positioning support plate 31 and the nut 4, and it is not easy to cause the deviation of the reserved box during the concrete vibration process, ensuring the forming quality of the tensioning notch; when the concrete begins to set after pouring, first remove the nut 4 on the prestressed steel bar 3, and then manually or use tools to pull up the steel hanging ear 2 to take out the steel box body 1 from the tensioning notch.

[0044] The above are only the preferred embodiments of the present application, and do not impose any formal restrictions on the present application. Based on the technical essence of the present application, any simple modifications, equivalent replacements, and improvements made to the above embodiments within the spirit and principles of the present application still fall within the protection scope of the technical solution of the present application.

Claims

1. A vertical prestressed steel bar tensioning notch reserved box, characterized in that, It includes a steel box body (1) and steel lifting lugs (2); the steel box body (1) includes a bottom plate (11) and a circle of side plates (12) arranged on the bottom plate (11), and prestressed steel bar positioning holes (13) are arranged on the bottom plate (11). The steel lifting lugs (2) include support rods (21) and hanging rods (22) arranged above the support rods (21). The two ends of the support rods (21) are respectively connected to the two ends of the hanging rods (22), and a hanging hole (23) is formed between the support rods (21) and the hanging rods (22). The support rods (21) span across the inner cavity of the steel box body (1), and its two ends are fixedly connected to the side plates (12). Part of the hanging rods (22) is arranged inside the steel box body (1), and the part of the hanging rods (22) located inside the steel box body (1) is attached to and fixedly connected to the inner surface of the side plates (12). The hanging rods (22) include top hanging sections (221) and hanging reinforcement sections (222) connected to both ends of the top hanging sections (221) and extending downward into the steel box body (1); the lower ends of the two hanging reinforcement sections (222) are respectively connected to the two ends of the support rods (21), and the hanging reinforcement sections (222) are attached to and fixedly connected to the inner surface of the side plates (12). The top hanging sections (221) are upwardly convex arcs or inverted U - shapes. The side plates (12) include four side vertical plates (121) connected end - to - end in sequence, and the lower ends of the side vertical plates (121) are connected to the bottom plate (11). Both the side vertical plates (121) and the bottom plate (11) are planar structures, and the included angle between the inner surface of the side vertical plates (121) and the upper surface of the bottom plate (11) is β, where 90° ≤ β ≤ 100°. Three prestressed steel bar positioning holes (13) are arranged on the bottom plate (11) at intervals along the first direction. The number of the steel lifting lugs (2) is two, and the two steel lifting lugs (2) are arranged at intervals along the first direction.

2. The vertical prestressed steel bar tension notch reserved box according to claim 1, characterized in that, Among them, β＝95°。 3. An installation method for a vertical prestressed steel bar tensioning notch reserved box, characterized in that, It includes the following steps: Provide the vertical prestressed steel bar tensioning notch reservation box described in any one of claims 1 to 2. Place the bottom plate (11) of the steel box body (1) on the positioning support plate (31) on the vertical prestressed steel bar (3), and make the upper end of the vertical prestressed steel bar (3) pass through the prestressed steel bar positioning holes (13) of the bottom plate (11). Thread the nut (4) onto the vertical prestressed steel bar (3) and tighten it.

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