A vertical prestressed steel bar tensioning auxiliary fastening device and its usage method

Abstract

The present application discloses a vertical prestressed steel bar tensioning auxiliary fastening device and its usage method, which relates to the technical field of prestressed steel bar tensioning. The vertical prestressed steel bar tensioning auxiliary fastening device includes a fixed seat, a driving sprocket arranged on the fixed seat and rotating around its own axis, and a driving structure for driving the driving sprocket to rotate; a driven sprocket is arranged on one side of the driving sprocket, a chain is sleeved on the driving sprocket and the driven sprocket, a sleeve is coaxially fixed in the inner hole of the driven sprocket, and at least one end of the inner cavity of the sleeve has a fastening section with a regular polygon cross-section. By setting a chain drive structure composed of a driving sprocket, a driven sprocket and a chain, the present application can not only enable the driving structure to drive the sleeve to rotate through the chain drive structure to fasten the nut on the prestressed steel bar, but also transfer the working position of the driving structure to the outside of the tensioning bracket, preventing the operating space of the driving structure from being restricted by the tensioning bracket and improving the fastening efficiency of the nut.

Description

Technical Field

[0001] The present application relates to the technical field of prestressed steel bar tensioning, and particularly relates to a vertical prestressed steel bar tensioning auxiliary fastening device and a using method thereof. Background Art

[0002] Vertical prestressed steel bars are increasingly widely used in the vertical prestress of large bridges. After the vertical prestressed steel bars are tensioned, nuts need to be tightened on the vertical prestressed steel bars by manually rotating a wrench.

[0003] Currently, vertical prestressed steel bars are tensioned by using a tensioning jack in combination with a tensioning bracket and a tensioning rod. After tensioning, a socket wrench is used to tighten the nut through the space between two adjacent legs of the tensioning bracket. However, since the space between two adjacent legs of the tensioning bracket is relatively small, the rotation angle of the socket wrench is small, and the socket wrench needs to be repeatedly reversed during the entire tightening process, resulting in low tightening efficiency of the nut. Summary of the Invention

[0004] The purpose of the present application is to provide a vertical prestressed steel bar tensioning auxiliary fastening device and a using method thereof, so as to solve the problem of low nut tightening efficiency after the vertical prestressed steel bars are tensioned.

[0005] The technical solution adopted by the present application to solve its technical problems is as follows:

[0006] A vertical prestressed steel bar tensioning auxiliary fastening device includes a fixed seat, a driving sprocket disposed on the fixed seat and rotatable about its own axis, and a driving structure for driving the driving sprocket to rotate; a driven sprocket is disposed on one side of the driving sprocket, a chain is sleeved on the driving sprocket and the driven sprocket, a sleeve is coaxially fixed in the inner hole of the driven sprocket, the sleeve has an open structure at both ends, and at least one end of its inner cavity has a fastening section with a regular polygon cross-section.

[0007] Further, both ends of the inner cavity of the sleeve respectively have fastening sections.

[0008] Further, the outer diameter of the driving sprocket is larger than the outer diameter of the driven sprocket.

[0009] Further, the fixed seat includes an installation part and a foot pedal part connected to the installation part, and the driving sprocket is disposed on the installation part.

[0010] Further, the installation part includes a horizontally arranged installation plate, and the foot pedal part includes two foot pedal plates which are respectively disposed on both sides of the installation plate.

[0011] Further, a rotating shaft is coaxially and fixedly arranged in the inner hole of the driving sprocket. The first end of the rotating shaft is rotatably connected to the fixed seat, and the second end of the rotating shaft is connected to the driving structure.

[0012] Further, a positioning hole extending along the axial direction thereof is arranged at the first end of the rotating shaft, and a positioning post for being inserted into the positioning hole and rotatably matched with the positioning hole is arranged on the fixed seat.

[0013] Further, a positioning post extending along the axial direction thereof is arranged at the first end of the rotating shaft, and a positioning hole for accommodating the positioning post and rotatably matched with the positioning post is arranged on the fixed seat.

[0014] Further, the driving structure includes a handle, a manual wrench or an electric wrench for driving the rotating shaft to rotate around its own axis.

[0015] A using method of a vertical prestressed steel bar tensioning auxiliary fastening device includes the following steps: providing the vertical prestressed steel bar tensioning auxiliary fastening device; before the prestressed steel bar is tensioned, pre-installing a nut on the prestressed steel bar, sleeving the sleeve on the prestressed steel bar, and making the nut be accommodated in the fastening section; after the prestressed steel bar is tensioned, fixing the fixed seat on the basis of one side of the tensioning bracket, making the chain be tensioned, and controlling the driving structure to drive the driving sprocket to rotate.

[0016] Advantages of the present application:

[0017] The vertical prestressed steel bar tensioning auxiliary fastening device and its using method provided by the embodiment of the present application, by arranging a chain drive structure composed of a driving sprocket, a driven sprocket and a chain, not only can the driving structure drive the sleeve to rotate through the chain drive structure, so as to fasten the nut on the prestressed steel bar, but also can transfer the working position of the driving structure to the outside of the tensioning bracket, preventing the operating space of the driving structure from being restricted by the tensioning bracket, solving the problem in the prior art that the fastening efficiency of the nut is low due to the restriction of the operating space of the socket wrench by the tensioning bracket, and improving the fastening efficiency of the nut. Brief description of the drawings

[0018] 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 also be obtained according to these drawings without creative efforts.

[0019] Figure 1 is a schematic structural diagram when a socket wrench is used to fasten a nut in the prior art;

[0020] Figure 2 is Figure 1 a sectional view taken along line A-A in

[0021] Figure 3 a schematic structural view of the vertical prestressed steel bar tensioning auxiliary fastening device provided by an embodiment of the present application;

[0022] Figure 4 is Figure 3 a sectional view taken along line B-B in

[0023] Figure 5 is Figure 3 a sectional view taken along line C-C in

[0024] Figure 6 a schematic structural view of the connection between the rotating shaft and the fixed seat;

[0025] Figure 7 a schematic structural view when the nut is fastened by using the vertical prestressed steel bar tensioning auxiliary fastening device provided by an embodiment of the present application;

[0026] Figure 8 is Figure 7 a sectional view taken along line D-D in

[0027] Reference numerals:

[0028] 1 - Prestressed steel bar;

[0029] 2 - Nut;

[0030] 3 - Tensioning bracket; 31 - Leg;

[0031] 4 - Tensioning jack;

[0032] 5 - Tensioning rod;

[0033] 6 - Socket wrench; 61 - Socket; 62 - Handle;

[0034] 10 - Fixed seat; 101 - Installation part; 102 - Foot step part; 103 - Positioning column;

[0035] 11 - Driving sprocket;

[0036] 12 - Driving structure;

[0037] 13 - Driven sprocket;

[0038] 14 - Chain;

[0039] 15 - Sleeve; 151 - Fastening section;

[0040] 16 - Rotating shaft; 161 - Positioning hole. Detailed implementation manners

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application.

[0042] 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 this application and the features in the embodiments can be combined with each other.

[0043] In the description of the embodiments of this 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 "arranged", "provided with", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements.

[0044] Figure 1 is a schematic structural diagram of using a socket wrench to tighten a nut in the prior art; Figure 2 is Figure 1 a cross-sectional view along line A-A in

[0045] See Figure 1 , Figure 2 , after the prestressed steel bar 1 is tensioned by the cooperation of the tensioning bracket 3, the tensioning jack 4, and the tensioning rod 5, the nut 2 is then tightened on the prestressed steel bar 1 by using the socket wrench 6. Among them, the socket wrench 6 includes a socket 61 and a handle 62 fixed on the socket 61. During operation, the socket 61 is sleeved on the nut 2, and the handle 62 passes through between any two legs 31 of the tensioning bracket 3, so that the operating end of the handle 62 is located outside the tensioning bracket 3. The worker holds the operating end of the handle 62 and drives the socket 61 to rotate, and the nut 2 is tightened on the prestressed steel bar 1 through the socket 61. Since the space between any two legs 31 of the tensioning bracket 3 is relatively small, the handle 62 can only rotate between these two legs 31 and cannot rotate 360°. Therefore, during the process of tightening the nut 2, the worker needs to repeatedly rotate the socket 61 and the handle 62, which results in a low tightening efficiency of the nut 2.

[0046] To solve the above problems and improve the tightening efficiency of the nut 2, see Figures 3 to 6, an embodiment of the present application provides a vertical prestressed steel bar tensioning auxiliary fastening device, which includes a fixed seat 10, a driving sprocket 11 arranged on the fixed seat 10 and rotating around its own axis, and a driving structure 12 for driving the driving sprocket 11 to rotate; a driven sprocket 13 is arranged on one side of the driving sprocket 11, a chain 14 is sleeved on the driving sprocket 11 and the driven sprocket 13, and a sleeve 15 is coaxially fixed in the inner hole of the driven sprocket 13. The sleeve 15 has an open structure at both ends, and at least one end of its inner cavity has a fastening section 151 with a regular polygon cross-section.

[0047] See Figure 3 , Figure 4 , the fixed seat 10 is used to support and install the driving sprocket 11. Exemplarily, the axis of the driving sprocket 11 is vertically arranged, the driving sprocket 11 is arranged on the fixed seat 10 and can rotate around its own axis. The driving structure 12 is connected to the driving sprocket 11 and is used to drive the driving sprocket 11 to rotate. Exemplarily, the driving structure 12 can be a handle, a manual wrench or an electric wrench, etc. The driven sprocket 13 is arranged on one side of the driving sprocket 11, wherein the axis of the driven sprocket 13 is parallel to the axis of the driving sprocket 11. The chain 14 is an annular structure and is sleeved on the driving sprocket 11 and the driven sprocket 13, so that the driving sprocket 11 drives the driven sprocket 13 to rotate through the chain 14. The sleeve 15 is coaxially fixed in the inner hole of the driven sprocket 13, and both ends of the sleeve 15 are located on the upper and lower sides of the driven sprocket 13 respectively. The sleeve 15 has an inner cavity extending along its axis, and its inner cavity has an open structure at both the upper and lower ends. See Figure 3 , Figure 5 , the lower end of the inner cavity of the sleeve 15 has a fastening section 151 with a regular polygon cross-section; by setting the fastening section 151, the nut 2 is used to be accommodated in the fastening section 151, and then the nut 2 is driven to rotate synchronously through the sleeve 15. Exemplarily, the cross-sectional shape of the fastening section 151 is adapted to the outer shape of the nut 2; for example, when the outer shape of the nut 2 is a regular hexagon, the cross-sectional shape of the fastening section 151 can be a regular hexagon or a regular dodecagon. Of course, the cross-sectional shape of the fastening section 151 can also be other regular polygons such as a regular quadrilateral or a regular octagon, which is not specifically limited here.

[0048] An embodiment of the present application provides a method for using a vertical prestressed steel bar tensioning auxiliary fastening device, which includes the following steps: providing the vertical prestressed steel bar tensioning auxiliary fastening device of the above embodiment; before the prestressed steel bar 1 is tensioned, pre-install the nut 2 on the prestressed steel bar 1, sleeve the sleeve 15 on the prestressed steel bar 1, and make the nut 2 be accommodated in the fastening section 151; after the prestressed steel bar 1 is tensioned, fix the fixed seat 10 on the foundation on one side of the tensioning bracket 3, and make the chain 14 be tensioned, and control the driving structure 12 to drive the driving sprocket 11 to rotate.

[0049] Figure 7 It is a schematic structural diagram when the nut is fastened by using the vertical prestressed steel bar tensioning auxiliary fastening device provided by the embodiment of the present application; Figure 8 It is Figure 7 A sectional view along line D-D in

[0050] Refer to Figure 7 、 Figure 8 , the prestressed steel bar 1 is first tensioned by the cooperation of the tensioning bracket 3, the tensioning jack 4 and the tensioning rod 5, and then the nut 2 is fastened on the prestressed steel bar 1 by using the vertical prestressed steel bar tensioning auxiliary fastening device provided by the embodiment of the present application. The tensioning process of the prestressed steel bar 1 will not be described in detail here. The following only combines Figure 7 、 Figure 8 To illustrate the fastening process of the nut 2: Among them, before the prestressed steel bar 1 is tensioned, the nut 2 should be pre-installed on the prestressed steel bar 1 first. After the upper end of the prestressed steel bar 1 is threadedly connected to the lower end of the tensioning rod 5, the sleeve 15 is sleeved on the tensioning rod 5 and the prestressed steel bar 1, and the nut 2 is accommodated in the fastening section 151 of the sleeve 15; when the prestressed steel bar 1 is tensioned, the fixed seat 10 is placed on the foundation on one side of the tensioning bracket 3, the chain 14 is sleeved on the driving sprocket 11 and the driven sprocket 13, and the position of the fixed seat 10 is adjusted so that the chain 14 is in a tensioned state; then the fixed seat 10 is fixed on the foundation or stepped on with feet to prevent the position of the fixed seat 10 from changing during the operation process; then the driving structure 12 is used to drive the driving sprocket 11 to rotate, the driving sprocket 11 drives the driven sprocket 13 to rotate through the chain 14, the driven sprocket 13 drives the sleeve 15 to rotate, and the sleeve 15 drives the nut 2 to rotate, so as to fasten the nut 2 on the prestressed steel bar 1.

[0051] The vertical prestressed steel bar tensioning auxiliary fastening device and its use method provided by the embodiment of the present application, by setting a chain drive structure composed of a driving sprocket 11, a driven sprocket 13 and a chain 14, can not only make the driving structure 12 drive the sleeve 15 to rotate through the chain drive structure, so as to fasten the nut 2 on the prestressed steel bar 1, but also transfer the working position of the driving structure 12 to the outside of the tensioning bracket 3, preventing the operation space of the driving structure 12 from being restricted by the tensioning bracket 3, so that the driving structure 12 and the tensioning bracket 3 do not interfere with each other, solving the problem of low fastening efficiency of the nut due to the restriction of the operation space of the socket wrench by the tensioning bracket in the prior art, and improving the fastening efficiency of the nut.

[0052] Refer to Figure 3, the vertical prestressed steel bar tensioning auxiliary fastening device provided by the embodiments of the present application has fastening sections 151 at both ends of the inner cavity of the sleeve 15. In this way, the nut 2 can be fastened through either end of the sleeve 15, improving the convenience of operation. The cross-sectional shape of the inner cavity of the sleeve 15 except for the fastening section 151 can be circular, polygonal or other shapes, as long as it can ensure that the sleeve 15 can rotate relative to the tensioning rod 5 when fastening the nut 2. Exemplarily, the cross-sectional shape of the inner cavity of the sleeve 15 except for the fastening section 151 is consistent with the cross-sectional shape of the fastening section 151.

[0053] To further improve the fastening efficiency, refer to Figure 4 , the outer diameter of the driving sprocket 11 is larger than the outer diameter of the driven sprocket 13. By setting the outer diameter of the driving sprocket 11 to be larger than the outer diameter of the driven sprocket 13, the transmission ratio of this chain drive structure can be made less than 1, thereby increasing the output speed of the driven sprocket 13 and achieving the purpose of acceleration. In this way, the fastening efficiency when fastening the nut 2 can be further improved.

[0054] Refer to Figure 4 , the fixed seat 10 includes a mounting portion 101 and a foot pedal portion 102 connected to the mounting portion 101, and the driving sprocket 11 is arranged on the mounting portion 101. When fastening the nut 2, there is no need to fix the fixed seat 10 to the foundation through other structures. The operator only needs to step on the foot pedal portion 102 with his feet to temporarily fix the fixed seat 10.

[0055] Exemplarily, the mounting portion 101 includes a horizontally arranged mounting plate, and the foot pedal portion 102 includes two foot pedal plates, which are respectively arranged on both sides of the mounting plate. By providing two foot pedal plates and arranging them on both sides of the mounting plate, the operator can step on the two foot pedal plates with both feet to temporarily fix the fixed seat 10 to the foundation by using the entire weight of the operator.

[0056] As an implementation manner, the driving sprocket 11 can be installed on the fixed seat 10 through a bearing structure. As another implementation manner, refer to Figure 3 、 Figure 4 , a rotating shaft 16 is coaxially fixed in the inner hole of the driving sprocket 11. The first end of the rotating shaft 16 is rotatably connected to the fixed seat 10, and the second end of the rotating shaft 16 is connected to the driving structure 12. The first end of the rotating shaft 16 can be rotatably installed on the fixed seat 10 through a bearing structure, but this structure is not convenient for disassembly and assembly.

[0057] To facilitate the disassembly and installation of the rotating shaft 16 and the fixed seat 10, refer to Figure 6, a positioning hole 161 extending along its axial direction is provided at the first end of the rotating shaft 16, and a positioning post 103 is provided on the fixing base 10 for inserting into the positioning hole 161 and rotatably cooperating with the positioning hole 161. During operation, only need to insert the positioning post 103 on the fixing base 10 into the positioning hole 161 of the rotating shaft 16. Through the cooperation of the positioning hole 161 and the positioning post 103, not only can the radial direction of the rotating shaft 16 be limited, but also the rotating shaft 16 can rotate around its own axis.

[0058] As another implementation manner, the positioning hole 161 can be provided on the fixing base 10, and the positioning post 103 can be provided on the rotating shaft 16. For example, a positioning post 103 extending along its axial direction is provided at the first end of the rotating shaft 16, and a positioning hole 161 for accommodating the positioning post 103 and rotatably cooperating with the positioning post 103 is provided on the fixing base 10.

[0059] The rotating shaft 16 can be a solid structure or a hollow tubular structure, and no specific limitation is made here. When the rotating shaft 16 is a hollow tubular structure, the inner hole of the rotating shaft 16 can be used as the positioning hole 161.

[0060] The driving structure 12 includes a handle, a manual wrench or an electric wrench for driving the rotating shaft 16 to rotate around its own axis. For example, when the driving structure 12 is a handle, the handle is arranged perpendicular to the rotating shaft 16 and fixedly connected to the upper end of the rotating shaft 16. During operation, only need to rotate the handle to drive the rotating shaft 16 to rotate. When the driving structure 12 is a manual wrench, the upper end of the rotating shaft 16 has a screwing part cooperating with the manual wrench. During operation, only need to use the manual wrench to rotate the screwing part to drive the rotating shaft 16 to rotate through the screwing part. When the driving structure 12 is an electric wrench, the end face of the upper end of the rotating shaft 16 has a positioning groove matching with the bit of the electric wrench. During operation, only need to insert the bit of the electric wrench into the positioning groove and start the electric wrench to drive the rotating shaft 16 to rotate. Moreover, the electric wrench can also reduce the labor intensity of the operator and improve the fastening efficiency of the nut.

[0061] The above is only the preferred embodiment of the present application, and does not impose any form of limitation on the present application. According to the technical essence of the present application, within the spirit and principle of the present application, any simple modification, equivalent replacement and improvement made to the above embodiments still belong to the protection scope of the technical solution of the present application.

Claims

1. A vertical prestressed steel bar tensioning auxiliary fastening device, characterized in that, It includes a fixed seat (10), a driving sprocket (11) arranged on the fixed seat (10) and rotating about its own axis, and a driving structure (12) for driving the driving sprocket (11) to rotate; On one side of the driving sprocket (11), a driven sprocket (13) is arranged. A chain (14) is sleeved on the driving sprocket (11) and the driven sprocket (13). A sleeve (15) is coaxially fixed in the inner hole of the driven sprocket (13). The sleeve (15) has an open structure at both ends, and at least one end of its inner cavity has a fastening section (151) with a regular polygon cross-section; Both ends of the inner cavity of the sleeve (15) have fastening sections (151); The outer diameter of the driving sprocket (11) is larger than the outer diameter of the driven sprocket (13); The fixed seat (10) includes a mounting part (101) and a foot pedal part (102) connected to the mounting part (101). The driving sprocket (11) is arranged on the mounting part (101); The mounting part (101) includes a horizontally arranged mounting plate, and the foot pedal part (102) includes two foot pedal plates which are respectively arranged on both sides of the mounting plate; A rotating shaft (16) is coaxially fixed in the inner hole of the driving sprocket (11). The first end of the rotating shaft (16) is rotatably connected to the fixed seat (10), and the second end of the rotating shaft (16) is connected to the driving structure (12); A positioning hole (161) extending along its axial direction is arranged at the first end of the rotating shaft (16). A positioning post (103) is arranged on the fixed seat (10) for being inserted into the positioning hole (161) and rotatably cooperating with the positioning hole (161); A positioning post (103) extending along its axial direction is arranged at the first end of the rotating shaft (16). A positioning hole (161) is arranged on the fixed seat (10) for accommodating the positioning post (103) and rotatably cooperating with the positioning post (103); The driving structure (12) includes a handle, a manual wrench or an electric wrench for driving the rotating shaft (16) to rotate about its own axis.

2. A method for using a vertical prestressed steel bar tensioning auxiliary fastening device, characterized in that, It includes the following steps: Provide the vertical prestressed steel bar tensioning auxiliary fastening device as claimed in claim 1; Before the prestressed steel bar (1) is tensioned, pre-install the nut (2) on the prestressed steel bar (1), sleeve the sleeve (15) on the prestressed steel bar (1), and make the nut (2) be accommodated in the fastening section (151); After the prestressed steel bar (1) is tensioned, fix the fixed seat (10) on the foundation on one side of the tensioning bracket (3), make the chain (14) be tensioned, and control the driving structure (12) to drive the driving sprocket (11) to rotate.

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