Initial tensioning counter-force device for pre-tensioning method finish rolling deformed steel bar
By designing a preliminary tension reaction device for fixing the cross beam in the pre-tension method, the connection between the positioning nut and the fine-rolled rebar is solved, and the problem of insufficient tension space caused by the small spacing of the steel beam is achieved, and a stable tensioning operation is achieved .
Patent Information
- Application Number
- CN202420174902.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-24
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-01-24
AI Technical Summary
In the previous tensile method, the steel beam layout spacing of the 13mπ beam is small, resulting in a small space for single top or multiple tensioning and fine-rolled rebar, and the single top or multiple tensioning cannot be operated.
Design a preliminary tension reaction device for the first tensile method of fine-rolled rebar, including pre-embedding of the first fine-rolled rebar on the fixed cross beam, providing the first positioning nut and the second positioning nut, and passing the second precision rolling Rebar is connected with a jack for tensioning, making full use of the compressive resistance of finely rolled rebar.
It effectively solves the problem of small clearance single top or multiple tensioning and fine-rolling rebar, which facilitates the installation of tensioning steel plates and jacks, and improves operability.
Smart Images
Figure CN222332479U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of building construction, in particular to an initial tensioning reaction force device for pre-tensioning fine-rolled threaded steel. Background Art
[0002] With the development of bridge engineering and the actual situation of scarce soil resources in plain areas such as Anhui and Jiangsu, soilless roadbed pile-slab bridges are being used more and more widely, which has promoted the large-scale promotion and use of 13m pre-stressed π beams. The quality control of the key process of pre-stressing is particularly critical. Considering that the steel bundle arrangement spacing of the 13m π beam web is small, the space for single-top or multiple-top tensioning of fine-rolled rebar is small, and single-top or multiple-top tensioning cannot be performed. Utility Model Content
[0003] The utility model provides an initial tensioning reaction force device for pre-tensioning fine-rolled threaded steel bars, which is used to solve the defects in the prior art that the steel bundle arrangement spacing of the fixed crossbeam is small, the space for single-top or multiple-top tensioning fine-rolled threaded steel bars is small, and the single-top or multiple-top tensioning cannot be operated.
[0004] To achieve the above purpose, the technical solution of the utility model is: a pre-tensioning reaction force device for fine-rolled threaded steel bars, applied to a fixed beam, on which a first fine-rolled threaded steel bar is pre-embedded, comprising:
[0005] A first positioning nut, fixed on the fixed crossbeam;
[0006] A tensioned steel plate is provided with a second positioning nut corresponding to the first positioning nut, and a second finely rolled threaded steel bar is connected between the first positioning nut and the second positioning nut;
[0007] A third finished rolled threaded steel bar, one end of which is connected to the first finished rolled threaded steel bar, and the other end of which passes through the tensioned steel plate;
[0008] A jack is arranged on the tensioning steel plate, and the jack is used to tension the third fine-rolled threaded steel bar.
[0009] Preferably, a plurality of the first positioning nuts are provided, and a plurality of the second positioning nuts are provided corresponding to the first positioning nuts one by one.
[0010] Preferably, four first positioning nuts are provided on the fixed crossbeam, the tensioned steel plate is rectangular, and four second positioning nuts are provided on the tensioned steel plate and distributed at the four corners of the tensioned steel plate.
[0011] Preferably, the third finish-rolled threaded steel bar is connected to the first finish-rolled threaded steel bar via a connecting nut.
[0012] Preferably, the first fine-rolled threaded steel bars are provided with a plurality of bundles, the tensioning steel plate is provided with a plurality of mounting holes, and the first fine-rolled threaded steel bars pass through the mounting holes.
[0013] Preferably, the fixed crossbeam is provided with a mounting nut and a gasket, and the first precision-rolled threaded steel bar passes through the gasket and the mounting nut in sequence.
[0014] Preferably, the mounting nut box and the gasket are located between two adjacent first positioning nuts.
[0015] Preferably, the first positioning nut is welded and fixed on the fixed cross beam.
[0016] Compared with the prior art, the beneficial effect of the utility model is: by setting a first positioning nut on the fixed beam, setting a second positioning nut on the tensioning steel plate and setting a second fine-rolled threaded steel for connection, thus facilitating the installation of the tensioning steel plate and the jack on the fixed beam, making full use of the strong axial compressive resistance of the fine-rolled threaded steel, and effectively solving the problem of single-top or multiple tensioning fine-rolled threaded steel with small clear distance by the pre-tensioning method. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 It is a structural schematic diagram of the initial tensioning reaction force device provided by the utility model;
[0019] Figure 2 It is a structural schematic diagram of the tensioned steel plate provided by the utility model.
[0020] Reference numerals:
[0021] 10. Fixed crossbeam; 20. First fine-rolled threaded steel bar; 30. First positioning nut; 40. Tensioning steel plate; 41. Mounting hole; 50. Second positioning nut; 60. Second fine-rolled threaded steel bar; 70. Third fine-rolled threaded steel bar; 80. Jack; 90. Connecting nut; 100. Gasket; 110. Mounting nut. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides an initial tensioning reaction force device for pre-tensioning fine-rolled threaded steel, which is applied to a fixed beam 10, on which a first fine-rolled threaded steel 20 is pre-embedded, and the initial tensioning reaction force device includes a first positioning nut 30, a tensioning steel plate 40, a second positioning nut 50, a second fine-rolled threaded steel 60, a third fine-rolled threaded steel 70 and a jack 80.
[0024] Specifically, the first positioning nut 30 is welded and fixed on the fixed beam 10, and a second positioning nut 50 corresponding to the first positioning nut 30 is arranged on the tensioning steel plate 40. A second fine-rolled threaded steel 60 is connected between the first positioning nut 30 and the second positioning nut 50, so as to ensure that the tensioning steel plate 40 and the fixed beam 10 are stably connected. A third fine-rolled threaded steel 70 is passed through the tensioning steel plate 40, and the third fine-rolled threaded steel 70 is connected to the first fine-rolled threaded steel 20 by a connecting nut 90. A jack 80 is arranged on the tensioning steel plate 40, and the jack 80 is used to tension the third fine-rolled threaded steel 70. By setting a first positioning nut 30 on the fixed beam 10, setting a second positioning nut 50 on the tensioning steel plate 40 and setting a second fine-rolled threaded steel 60 for connection, it is convenient to install the tensioning steel plate 40 and the jack 80 on the fixed beam 10, and the strong axial compressive resistance of the fine-rolled threaded steel is fully utilized, which effectively solves the problem of small-clearance tensioning single-top tensioning fine-rolled threaded steel by the pre-tensioning method.
[0025] In the present application, in order to ensure stable installation between the tensioning steel plate 40 and the fixed beam 10 , a plurality of first positioning nuts 30 are provided, and a plurality of second positioning nuts 50 are provided to correspond one by one to the first positioning nuts 30 .
[0026] Specifically, four first positioning nuts 30 are provided on the fixed crossbeam 10 , the tensioning steel plate 40 is rectangular, and four second positioning nuts 50 are provided on the tensioning steel plate 40 and distributed at four corners of the tensioning steel plate 40 .
[0027] It should be understood that the number of first fine-rolled threaded steel bars 20 can be one bundle or multiple bundles. Multiple mounting holes 41 are provided on the tensioning steel plate 40. When multiple bundles of first fine-rolled threaded steel bars 20 are provided, multiple bundles of first fine-rolled threaded steel bars 20 can still pass through the mounting holes 41.
[0028] Furthermore, the plurality of first positioning nuts 30 enclose the first fine-rolled threaded steel bar 20 in the middle, and the first fine-rolled threaded steel bar 20 passes through the gasket 100 and the mounting nut 110 in sequence.
[0029] The tension reaction device of the present application is installed by the following steps:
[0030] A first positioning nut 30 is welded on the fixed beam 10, and a tensioning steel plate 40 is made according to the position of the first fine-rolled threaded steel 20 on the fixed beam 10; a second positioning nut 50 is set on the tensioning steel plate 40, and its position corresponds to the position of the first positioning nut 30 on the fixed beam 10; the second fine-rolled threaded steel 60 and the connecting nut 90 are installed to connect the first fine-rolled threaded steel 20 and the third fine-rolled threaded steel 70; the tensioning steel plate 40 is installed, and the first fine-rolled threaded steel 20 is inserted into the installation hole 41 of the tensioning steel plate 40; the pre-tensioning method initial tensioning through-type jack 80 is installed for initial tensioning, and after tensioning, the installation nut 110 and the gasket 100 at the fixed beam 10 are tightened in time;
[0031] After the tensioning is completed, the anchor is withdrawn and the next first fine-rolled rebar 20 is tensioned.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A pre-tensioning reaction force device for pre-tensioning fine-rolled threaded steel, applied to a fixed beam, wherein a first fine-rolled threaded steel is pre-embedded on the fixed beam, characterized in that: include: A first positioning nut, fixed on the fixed crossbeam; A tensioned steel plate is provided with a second positioning nut corresponding to the first positioning nut, and a second finely rolled threaded steel bar is connected between the first positioning nut and the second positioning nut; A third finished rolled threaded steel bar, one end of which is connected to the first finished rolled threaded steel bar, and the other end of which passes through the tensioned steel plate; A jack is arranged on the tensioning steel plate, and the jack is used to tension the third fine-rolled threaded steel bar.
2. The initial tensioning reaction force device for pre-tensioned finish-rolled threaded steel according to claim 1, characterized in that: A plurality of the first positioning nuts are provided, and a plurality of the second positioning nuts are provided corresponding to the first positioning nuts one by one.
3. The initial tensioning reaction force device for pre-tensioned finished rolled threaded steel according to claim 2, characterized in that: Four first positioning nuts are arranged on the fixed crossbeam, the tensioned steel plate is rectangular, and four second positioning nuts are arranged on the tensioned steel plate and distributed at the four corners of the tensioned steel plate.
4. The initial tensioning reaction force device for pre-tensioned finished rolled threaded steel according to any one of claims 1 to 3, characterized in that: The third finished rolled threaded steel bar is connected to the first finished rolled threaded steel bar via a connecting nut.
5. The initial tensioning reaction force device for pre-tensioned finish-rolled threaded steel according to claim 4, characterized in that: The first fine-rolled threaded steel bars are provided with a plurality of bundles, the tensioning steel plate is provided with a plurality of mounting holes, and the first fine-rolled threaded steel bars pass through the mounting holes.
6. The initial tensioning reaction force device for pre-tensioned finish-rolled threaded steel according to claim 5, characterized in that: The fixed crossbeam is provided with a mounting nut and a gasket, and the first finish-rolled threaded steel bar passes through the gasket and the mounting nut in sequence.
7. The initial tensioning reaction force device for pre-tensioned finish-rolled threaded steel according to claim 6, characterized in that: The mounting nut box and the gasket are located between two adjacent first positioning nuts.
8. The initial tensioning reaction force device for pre-tensioned finish-rolled threaded steel according to claim 1, characterized in that: The first positioning nut is welded and fixed on the fixed cross beam.