CN107542272B - Novel portable prestressed pull rod tensioning device - Google Patents
Novel portable prestressed pull rod tensioning device Download PDFInfo
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- CN107542272B CN107542272B CN201710912827.3A CN201710912827A CN107542272B CN 107542272 B CN107542272 B CN 107542272B CN 201710912827 A CN201710912827 A CN 201710912827A CN 107542272 B CN107542272 B CN 107542272B
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Abstract
Novel portable prestressing force pull rod stretch-draw device, its characterized in that: the device comprises two tensioning jacks (1), two threaded screws (2), two rod end screws (3), two clamps (4), an extension tensioning pull rod (7), two digital pressure gauges (8), an adjusting sleeve (6) and two pull rod end nut heads (5); the invention is convenient for construction, well solves the problems that the steel structure prestress pull rod is difficult to control in the installation process, the eccentricity is likely to occur, the construction machinery is complex and the like, and has the advantages of small volume, easy installation and easy disassembly, high-precision control of the tension force and capability of detecting the eccentricity.
Description
Technical Field
The invention relates to a tensioning device of a steel structure prestress pull rod, and belongs to the field of civil engineering.
Background
With the arrival of new economic construction development trend, the demand of China for large-span prestressed steel structure buildings such as large international convention centers, airport terminal buildings, high-speed rails, light rail stations and the like is increasingly larger, and a wide development space is provided for the prestressed pull rod tensioning technology. But simultaneously, the method has higher standards and specifications for ensuring the high quality and high efficiency of the prestressed steel structure and safely carrying out engineering construction.
The application of the prestress has important significance for reducing the consumption of steel, adjusting the stress and structural deformation of the rod piece, improving the structural safety and realizing the light large-span crossing, and the prestress steel structure saves the steel by about 25 percent, so that the prestress steel structure has obvious economic benefit. Different from the application of concrete prestress, the construction of the steel structure prestress needs to integrate the design and construction technology of the complex steel structure. Therefore, the construction difficulty is increased, and the requirement on the tensioning device is higher.
In the existing prestress pull rod tensioning device, most of equipment is heavy and is not easy to recycle completely, tension force control cannot be accurate, eccentric tensioning is easy, and adverse effects on later-stage bearing exist.
Disclosure of Invention
The invention aims to:
a novel portable prestress pull rod tensioning device aims to solve the problems that the prestress pull rod of a steel structure is difficult to control, eccentricity can occur, construction machinery is complex and the like in the installation process,
the technical proposal is that;
the invention provides a novel portable prestress pull rod tensioning device which comprises two tensioning jacks, two screws, two rod end screw rods, two clamps, an extension tensioning pull rod, two digital pressure gauges, an adjusting sleeve, two pull rod end nut heads and four hand pull rings. The extension stretching pull rod and the pull rod to be stretched can be mechanically connected and fixed; each clamp is divided into two pieces, the extension stretching pull rod is fixed through a sleeve and a screw, the left clamp is temporarily fixed, a certain distance is reserved between the left clamp and the reducing part of the pull rod, and the extension stretching pull rod can move leftwards. The tensioning process is divided into two parts, wherein the first part is to directly tension the pull rod through the jack, the left end of the pull rod is fixed after most tensioning is completed, and the next precise tensioning is performed through the adjusting sleeve. The invention has the advantages of high precision control of the stretching force to 1%, timely finding of eccentricity, avoiding eccentric stretching, simple structure, small volume and detachable and reusable.
The whole device can be reused. The fixture is provided with three through holes, the screw rod (2) penetrates through the upper through hole and the lower through hole, the right end of the screw rod (2) is a plug slightly larger than the diameter of the screw rod, and the diameter of the screw rod is preferably about 5 cm. The reducing pull rod passes through the middle through hole of the fixture. The nut head of the pull rod end is hollow and is connected with an adjusting sleeve with threads, which is also hollow, and the two tensioning jacks penetrate through the left clamp of the device.
Furthermore, the fixture is made of Q235 steel, the whole thickness is preferably about 25cm, and the hollow part is preferably about 10 cm. Two pieces are spliced, and the middle is fixed by a screw (4-1) and a sleeve (4-2). Through the double fixation of the screw and the sleeve, two pieces of the clamp can be well connected into a whole.
Further, four hand pull rings (9) are respectively arranged on the upper side and the lower side of the left clamp and the right clamp.
The steel grade adopted by the pull ring is A3, and the steel has stable property, high rigidity and high hardness, can be used as a temporary fixing point of the left clamp (4) and also can be used as a temporary movable handheld end.
Furthermore, a pressure gauge (8) is arranged at the middle point of the distance between the screw and the upper edge and the lower edge of the clamp respectively and is connected with the reserved position on the clamp.
The tension force can be controlled with high precision by the arrangement of the pressure gauge (8), namely, the tension force is judged by the displayed indication number, whether the tension process is eccentric or not can be judged by judging whether the indication numbers of the two pressure gauges are consistent, and the eccentricity can be corrected in time.
Further, four small-sized force application rods are symmetrically arranged on the adjusting sleeve, and the force application rods can pass through a gap between the screw (2) and the sleeve (4-2). The force arm can be increased by the force application rod through the outer sleeve steel pipe, so that the applied force is minimized.
The specific method is as follows: the device comprises two tensioning jacks (1), two threaded screws (2), two rod end screws (3), two clamps (4), an extension tensioning pull rod (7), two digital pressure gauges (8), an adjusting sleeve (6) and two pull rod end nut heads (5); two threaded screws (2) are connected between the two clamps (4), two extension stretching pull rods (7) are connected, each of the two extension stretching pull rods (7) is connected with one pull rod end nut head (5), each of the two pull rod end nut heads (5) is connected to the adjusting sleeve (6) through one rod end screw rod (3), and the rod end screw rods (3) are in threaded fit with the pull rod end nut heads (5) and the adjusting sleeve (6); the two pressure gauges (8) are arranged between the two clamps (4) and the two pressure gauges (8) are symmetrically arranged relative to the axis of the extension stretching pull rod (7); two tensioning jacks (1) are connected to one of the clamps (4).
The left end fixture (4) is temporarily fixed, and the right end of the screw rod (2) is provided with a section of reducing part with a diameter slightly larger than that of the screw rod, so as to clamp the fixture (4) at the other side and transfer the tensile force to the fixture. Meanwhile, the reducing can well reduce stress concentration and prevent the crushing caused by overlarge pulling force. The diameter is reduced because the mutation is likely to cause stress concentration and fracture. The variable diameter part is a head with a diameter larger than that of the screw (2) and is connected with the screw (2) after passing through the other side clamp (4) on the outer side so as to complete the action of clamping the other side clamp (4) +!
The two clamps (4) are spliced, the bottom surface of the upper clamp and the top surface of the lower clamp are respectively provided with a half hole, and when the two clamps (4) are combined, a through hole for the extension stretching pull rod (7) to pass through is formed in the center.
An extension half pipe (4-3) is formed by outwards extending one side of each half hole along the circular arc, a fixing hole (4-4) for fixing a screw rod (2) is formed in each clamp (4), and two holes (4-5) for combining are formed in the butt joint surface of two clamps so as to be connected by screw rods and screws; and a groove (4-6) for placing the pressure gauge is reserved
Four small cylindrical force applying rods (6-1) are uniformly arranged on the circumference of the adjusting sleeve (6), and can penetrate through the space between the sleeve and the screw. The meaning of the present invention is that the force applying rod is not particularly long, and can rotate 360 degrees structurally, but the force arm (which is mentioned later) is increased by sleeving the force applying rod with a steel pipe, the force applying rod is blocked by the screw rod due to overlong force applying rod, and only can rotate a small angle
The extension stretching pull rod adopts variable diameter and is connected with the hollow threaded sleeve through two rod end screws with opposite threads. The end nut head (5) of the pull rod adopts variable diameter and has the same function as the previous-!
Four hand pull rings (9) are arranged on each clamp (4), and the four hand pull rings (9) are respectively arranged at the upper end and the lower end of each clamp.
The advantages and effects are that:
the invention is convenient for construction, well solves the problems that the steel structure prestress pull rod is difficult to control in the installation process, the eccentricity is likely to occur, the construction machinery is complex and the like, and has the advantages of small volume, easy installation and easy disassembly, high-precision control of the tension force and capability of detecting the eccentricity.
Drawings
FIG. 1 is a general schematic diagram of a tensioning device
FIG. 2 is a side view of a tensioning device
FIG. 3 is a schematic view of a fixture structure
FIG. 4 is a schematic view of an adjusting sleeve
Fig. 5 is a schematic view of a draw rod and draw rod end nut head construction.
Detailed description of the preferred embodiments
Novel portable prestressing force pull rod stretch-draw device, its characterized in that: the device comprises two tensioning jacks (1), two threaded screws (2), two rod end screws (3), two clamps (4), an extension tensioning pull rod (7), two digital pressure gauges (8), an adjusting sleeve (6) and two pull rod end nut heads (5); two threaded screws (2) are connected between the two clamps (4), two extension stretching pull rods (7) are connected, each of the two extension stretching pull rods (7) is connected with one pull rod end nut head (5), each of the two pull rod end nut heads (5) is connected to the adjusting sleeve (6) through one rod end screw rod (3), and the rod end screw rods (3) are in threaded fit with the pull rod end nut heads (5) and the adjusting sleeve (6); the two pressure gauges (8) are arranged between the two clamps (4) and the two pressure gauges (8) are symmetrically arranged relative to the axis of the extension stretching pull rod (7); two tensioning jacks (1) are connected to one of the clamps (4).
The left end fixture (4) is temporarily fixed, and the right end of the screw rod (2) is provided with a section of reducing part with a diameter slightly larger than that of the screw rod, so as to clamp the fixture (4) at the other side and transfer the tensile force to the fixture. Meanwhile, the reducing can well reduce stress concentration and prevent the crushing caused by overlarge pulling force. The diameter is reduced because the mutation is likely to cause stress concentration and fracture. The variable diameter part is a head with a diameter larger than that of the screw (2) and is connected with the screw (2) after passing through the other side clamp (4) on the outer side so as to complete the action of clamping the other side clamp (4) +!
The two clamps (4) are spliced, the bottom surface of the upper clamp and the top surface of the lower clamp are respectively provided with a half hole, and when the two clamps (4) are combined, a through hole for the extension stretching pull rod (7) to pass through is formed in the center.
An extension half pipe (4-3) is formed by outwards extending one side of each half hole along the circular arc, a fixing hole (4-4) for fixing a screw rod (2) is formed in each clamp (4), and two holes (4-5) for combining are formed in the butt joint surface of two clamps so as to be connected by screw rods and screws; and a groove (4-6) for placing the pressure gauge is reserved
Four small cylindrical force applying rods (6-1) are uniformly arranged on the circumference of the adjusting sleeve (6), and can penetrate through the space between the sleeve and the screw. The meaning of the present invention is that the force applying rod is not particularly long, and can rotate 360 degrees structurally, but the force arm (which is mentioned later) is increased by sleeving the force applying rod with a steel pipe, the force applying rod is blocked by the screw rod due to overlong force applying rod, and only can rotate a small angle
The extension stretching pull rod adopts variable diameter and is connected with the hollow threaded sleeve through two rod end screws with opposite threads. The end nut head (5) of the pull rod adopts variable diameter and has the same function as the previous-!
Four hand pull rings (9) are arranged on each clamp (4), and the four hand pull rings (9) are respectively arranged at the upper end and the lower end of each clamp.
Specific embodiments of the invention will be described in detail with reference to the accompanying drawings and the summary: the extension stretching pull rod (7) can move left and right to adapt to the extension of the pull rod to be stretched connected with the extension stretching pull rod. Because the left clamp (4) and the right clamp (4) are respectively two, the two clamp pieces are firstly required to be butted, the extension tension pull rod (7) is sleeved, the screw nut is penetrated through the reserved hole (4-5), the screw nut is screwed and fixed, and then the sleeve (4-2) with a slightly larger caliber is sleeved for further fixation, so that loosening is prevented.
After the fixture (4) is installed, the two screws (2) respectively penetrate through the through holes at the upper end and the lower end from right to left, and then the two tensioning jacks (1) at the left side are installed, so that the fixture at the right side is abutted against the diameter-changing part of the extension pull rod.
Then temporarily fixing the upper and lower ends of the left clamp (4) at other parts of the structure, and enabling the left clamp to have a certain distance from the reducing part; next, two pressure gauges (8) are installed, screwed into the threaded grooves (4-6) reserved on the clamps, and zeroed to fix the left clamp.
After the device is installed, tensioning the components, simultaneously supplying oil in an equivalent amount through an oil pipe of a tensioning jack (1) so as to enable a screw (2) to push the same distance leftwards, and simultaneously transmitting tension to a pull rod through a right clamp (4) to realize large prestress tensioning of the pull rod.
In the tensioning process, whether the readings of the two pressure gauges (8) are consistent or not is considered at all times, and the tensioning eccentricity is found out when the deviation is found, so that the adjustment should be timely carried out to avoid unnecessary economic loss caused by continuous eccentric tensioning.
The whole tensioning process is divided into three stages, the first stage is tensioned to 10% of a design value, if all normal second stages continue to be tensioned to 80% of the design value, the rest small tensioning force is precisely controlled by adopting an adjusting sleeve, the tensioning speed is preferably about 20% of the previous speed until the tensioning speed reaches 105% of the design value, so that the loss of prestress is reduced, the jack transmits axial force to the end nut head of the pull rod through the clamp (4), at the moment, the two clamp (4) can be closed towards the middle, at the moment, the end nut head (5) of the pull rod and the end screw rod (3) have a small gap, at the moment, a small force application rod which is uniformly arranged on the adjusting sleeve by using a hollow steel sleeve is pulled downwards, the end screw rods (3) at the two ends are screwed into the adjusting sleeve (6), and the action is repeated, so that the purpose of tensioning the pull rod is achieved.
After all stretching is completed, the pull rod to be stretched is fixed. And then unloading the tensioning jack (1), unloading the left clamp (4), taking off the sleeve (4-2), screwing out the fixed screw nuts, separating two clamp pieces, unloading the pressure gauge (8), unloading the right clamp, and pulling out the screw, thereby completing the disassembly.
In addition, the tension force is further judged according to the depth of penetration and the indication of the pressure gauge, effective precise control is realized, and the problems of inaccurate tension value and the like can be solved.
If a moving device is needed before or during stretching, the device can be adjusted and moved through four hand pull rings (9) welded on the fixture.
Claims (2)
1. A portable prestressing force pull rod stretching device, its characterized in that: the device comprises two tensioning jacks (1), two threaded screws (2), two rod end screws (3), two clamps (4), an extension tensioning pull rod (7), two digital pressure gauges (8), an adjusting sleeve (6) and two pull rod end nut heads (5); two threaded screws (2) are connected between the two clamps (4), two extension stretching pull rods (7) are connected, each of the two extension stretching pull rods (7) is connected with one pull rod end nut head (5), each of the two pull rod end nut heads (5) is connected to the adjusting sleeve (6) through one rod end screw rod (3), and the rod end screw rods (3) are in threaded fit with the pull rod end nut heads (5) and the adjusting sleeve (6); the two pressure gauges (8) are arranged between the two clamps (4) and the two pressure gauges (8) are symmetrically arranged relative to the axis of the extension stretching pull rod (7); the two tensioning jacks (1) are connected to one fixture (4);
the left end clamp (4) is temporarily fixed, the right end of the screw rod (2) is provided with a section of diameter-changing part with a diameter slightly larger than that of the screw rod, and the diameter-changing part is used for clamping the clamp (4) at the other side and transmitting tension to the clamp;
the two clamps (4) are spliced, the bottom surface of the upper clamp and the top surface of the lower clamp are respectively provided with a half hole, and when the two clamps (4) are combined, a through hole for the extension stretching pull rod (7) to pass through is formed in the center;
an extension half pipe (4-3) is formed by outwards extending one side of each half hole along the circular arc, a fixing hole (4-4) for fixing a screw rod (2) is formed in each clamp (4), and two holes (4-5) for combining are formed in the butt joint surface of two clamps so as to be connected by screw rods and screws; and a groove (4-6) for placing the pressure gauge is reserved;
four small cylindrical force applying rods (6-1) are uniformly arranged on the circumference of the adjusting sleeve (6) and can penetrate through the space between the sleeve and the screw rod;
the extension stretching pull rod adopts variable diameter and is connected with the hollow threaded sleeve through two rod end screws with opposite threads.
2. The portable pre-stressed tension bar tensioning device of claim 1, wherein: four hand pull rings (9) are arranged on each clamp (4), and the four hand pull rings (9) are respectively arranged at the upper end and the lower end of each clamp.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873534 | 2017-09-25 | ||
| CN2017108735349 | 2017-09-25 |
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| Publication Number | Publication Date |
|---|---|
| CN107542272A CN107542272A (en) | 2018-01-05 |
| CN107542272B true CN107542272B (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721272535.XU Active CN207686320U (en) | 2017-09-25 | 2017-09-30 | Novel portable prestressed draw-bar tensioning equipment |
| CN201710912827.3A Active CN107542272B (en) | 2017-09-25 | 2017-09-30 | Novel portable prestressed pull rod tensioning device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721272535.XU Active CN207686320U (en) | 2017-09-25 | 2017-09-30 | Novel portable prestressed draw-bar tensioning equipment |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207686320U (en) * | 2017-09-25 | 2018-08-03 | 沈阳工业大学 | Novel portable prestressed draw-bar tensioning equipment |
| CN111912639B (en) * | 2020-06-29 | 2022-02-01 | 济南恒瑞金试验机有限公司 | Mechanical property testing machine for outdoor cabinet |
| CN113047523B (en) * | 2021-05-12 | 2021-11-16 | 中建八局第二建设有限公司 | Prestressed steel pull rod for truss steel beam node support |
| CN117489044A (en) * | 2023-11-21 | 2024-02-02 | 长沙理工大学 | Variable-ripple clamping piece anchorage device for prestressed carbon fiber plate |
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| CN104847122A (en) * | 2015-05-08 | 2015-08-19 | 柳州欧维姆工程有限公司 | Device assembly for tensioning fork ear type stay rope or steel pull rod and tensioning construction method of device assembly |
| CN204691274U (en) * | 2015-04-10 | 2015-10-07 | 中亿丰建设集团股份有限公司 | A kind of tensioning system of reinforcing pull rod |
| CN105507596A (en) * | 2015-12-04 | 2016-04-20 | 上海同程建设科技工程有限公司 | Bidirectional rotatable tractive tool device for prestressed steel structure construction |
| CN106758824A (en) * | 2016-11-21 | 2017-05-31 | 武汉理工大学 | Long span Curved Beam Bridge tension of prestressed tendon method |
| CN207686320U (en) * | 2017-09-25 | 2018-08-03 | 沈阳工业大学 | Novel portable prestressed draw-bar tensioning equipment |
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2017
- 2017-09-30 CN CN201721272535.XU patent/CN207686320U/en active Active
- 2017-09-30 CN CN201710912827.3A patent/CN107542272B/en active Active
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|---|---|---|---|---|
| CN101532918A (en) * | 2009-04-27 | 2009-09-16 | 天津市建筑科学研究院 | Calibration system of core-through type prestressed tensioning hoisting jack |
| CN101845894A (en) * | 2010-06-23 | 2010-09-29 | 北京市建筑工程研究院 | U-shaped tool device for prestressed steel structure tensioning construction and construction method |
| CN102785290A (en) * | 2011-05-19 | 2012-11-21 | 中铁二十三局集团轨道交通工程有限公司 | Core-penetrating pull-type pedestal for pre-tensioned pre-stressing U-shaped beam and construction method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN207686320U (en) | 2018-08-03 |
| CN107542272A (en) | 2018-01-05 |
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