CN111236079B - A dual-mode self-calibrating tensioning device - Google Patents
A dual-mode self-calibrating tensioning device Download PDFInfo
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- CN111236079B CN111236079B CN202010133135.0A CN202010133135A CN111236079B CN 111236079 B CN111236079 B CN 111236079B CN 202010133135 A CN202010133135 A CN 202010133135A CN 111236079 B CN111236079 B CN 111236079B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
本发明涉及一种双模自校准张拉设备，包括张拉千斤顶，还包括用于检测对应张拉千斤顶内部液体压力的压力传感器，双模自校准张拉设备还包括与张拉千斤顶对应设置的标准力传感器，标准力传感器置于对应张拉千斤顶的轴向一侧，标准力传感器具有用于被对应张拉千斤顶的缸体或活塞杆顶推传力的顶推传力部。压力传感器检测张拉千斤顶内部的液体压强从而换算出张拉千斤顶对钢绞线的拉力，张拉千斤顶工作的同时，其缸体或活塞杆通过顶推传力部向标准力传感器施加作用力，标准力传感器测得该力，通过该力值与压力传感器的换算力值比较来对判断张拉千斤顶对钢绞线的张拉力是否准确，从而避免了人们也无法判定张拉设备是否处于完好状态的技术问题。
The invention relates to a dual-mode self-calibration tensioning device, which includes tensioning jacks and a pressure sensor for detecting the internal liquid pressure of the corresponding tensioning jacks. The dual-mode self-calibrating tensioning device further comprises a tensioning jack corresponding to the tensioning jack. Standard force sensor, the standard force sensor is placed on the axial side of the corresponding tensioning jack, and the standard force sensor has a pushing force transmission part for pushing force transmission by the cylinder or piston rod of the corresponding tensioning jack. The pressure sensor detects the liquid pressure inside the tension jack to convert the pulling force of the tension jack to the steel strand. At the same time as the tension jack works, its cylinder or piston rod exerts a force on the standard force sensor through the pushing force transmission part. The standard force sensor measures the force, and compares the force value with the converted force value of the pressure sensor to judge whether the tension force of the tension jack on the steel strand is accurate, so as to avoid people being unable to determine whether the tension equipment is in good condition. technical issues.
Description
Technical Field
The invention relates to a dual-mode self-calibration tensioning device in the field of steel strand prestress tensioning.
Background
In the construction of the prestressed bridge, the prestressed tensioning effect is a key factor for ensuring the bearing capacity of the bridge, and in the current tensioning system, the oil pressure of a tensioning hydraulic cylinder is converted into the tension of a steel strand by using a pressure sensor or a pressure gauge. According to the requirements of 'highway bridge construction technical specifications', the combined calibration is carried out on the tensioning jack and the oil meter once every 6 months or when the tensioning times exceed 300 times. In actual production, however, due to the fact that an oil cylinder is blocked due to the failure of the hydraulic cylinder or the friction force is increased due to the damage of a sealing element, the pressure in the cylinder is increased, and the tension of the prestressed tendon is insufficient; the other situation is that the tensioning equipment works outdoors frequently and the working position is changed frequently, so that the accuracy of the equipment is influenced, and even if a force sensor is installed, people cannot judge whether the tensioning equipment is in a good state due to the fact that the calibration period is not reached.
In addition, in the prior art, the tensioning jack completes simultaneous tensioning of a plurality of steel strands at one time, and converts the sum of the total tension of each steel strand according to the oil pressure, for example, for n steel strands, if the pretension force of each steel strand is required to be f, the tensioning jack needs to provide a tension value of n x f, when the tensioning jack provides the tension value of n x f, each steel strand is considered to equally divide the tension force, and the pretension force of each steel strand is f. However, the above is an ideal state assumed above, in a practical situation, because actual working conditions of each steel strand are different (for example, when a bending position is encountered, a bending radius of some steel strands is larger, and a bending radius of some steel strands is smaller), tension of each steel strand cannot be completely averaged, and in a tensioning manner in the prior art, after tensioning is finished, a pre-stress tension of some steel strands is lower than a design value, and a pre-stress tension of some steel strands is higher than the design value, so that a potential safety hazard exists. In addition, the tonnage requirement of the tensioning jack in the prior art is also large, so that the cost of the tensioning jack is particularly high, for example, the maximum tensioning force of the tensioning jack a is f, and the maximum tensioning force of the tensioning jack B is 9 f.
Disclosure of Invention
The invention aims to provide a dual-mode self-calibration tensioning device, which solves the technical problem that people cannot judge whether the tensioning force of the tensioning device is accurate or not when a calibration period is not reached in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the double-mode self-calibration tensioning equipment comprises at least one tensioning jack with a hollow structure and a pressure sensor used for detecting the pressure of liquid inside the corresponding tensioning jack, and further comprises a standard force sensor arranged corresponding to the tensioning jack, the standard force sensor is arranged on one axial side of the corresponding tensioning jack, and the standard force sensor is provided with a pushing force transmission part used for being pushed by a cylinder body or a piston rod of the corresponding tensioning jack to transmit force.
Standard force sensors have a central bore through which the respective steel strand passes.
The standard force sensor is a resistance strain gauge type force sensor.
The standard force sensor is a spoke type force sensor.
The dual-mode self-calibration tensioning equipment further comprises a jack support, and a plurality of tensioning jacks for respectively tensioning one steel strand during use are arranged on the jack support.
The jack support is provided with a cross slideway corresponding to each tensioning jack, the cross slideway comprises a vertical guide rail and a transverse guide rail, and the tensioning jacks are connected through the cross slideway of a spherical hinge structure.
The cross slide includes the lateral shifting support of guided movement assembly on lateral guideway, and vertical guide rail sets up on the lateral shifting support, and vertical guide rail includes vertical guide rail in left side and the vertical guide rail in right side, and the guided movement is equipped with the left side bracing piece on the vertical guide rail in left side, and the guided movement is equipped with the right side bracing piece on the vertical guide rail in right side, the ball pivot structure including connect in the tensioning jack with first ball pivot structure between the left side bracing piece with connect in the tensioning jack with second ball pivot structure between the right side bracing piece.
The invention has the beneficial effects that: when the double-mode self-calibration tensioning equipment stretches the steel strand, the pressure sensor detects the liquid pressure inside the tensioning jack so as to convert the tension of the tensioning jack on the steel strand, when the tensioning jack works, the cylinder body or the piston rod of the tensioning jack exerts acting force on the standard force sensor through the pushing force transmission part, the standard force sensor measures the force, and whether the tension of the tensioning jack on the steel strand is accurate or not is judged by comparing the force value with the conversion force value of the pressure sensor, so that the technical problem that people cannot judge whether the tensioning equipment is in a good state or not is solved.
Drawings
FIG. 1 is a state diagram of the use of one embodiment of the dual mode self calibrating tensioning device of the present invention;
FIG. 2 is a schematic view of the present invention showing the engagement of a jack-down jack with a jack stand;
fig. 3 is a schematic diagram of the state of the tension jack in fig. 2 after tensioning the steel strands.
Detailed Description
An embodiment of a dual-mode self-calibrating tensioning device is described in FIGS. 1-3: the dual-mode self-calibration tensioning device comprises a jack support 10 and nine tensioning jacks 5 with hollow structures, wherein each tensioning jack 5 can tension one steel strand 4, namely the dual-mode self-calibration tensioning device can simultaneously tension nine steel strands. The jack support is a frame structure formed by welding angle steel, cross slideways corresponding to the number of the tensioning jacks are arranged on the jack support, each cross slideway comprises a vertical guide rail and a transverse guide rail 14, the guide direction of the transverse guide rail is the left-right direction, the guide direction of the vertical guide rail is the up-down direction, the cross slideways also comprise a transverse moving support 15 assembled on the transverse guide rail in a guiding and moving way, the vertical guide rail comprises a left vertical guide rail 16 and a right vertical guide rail 17 arranged on the transverse moving support, the cross slideways also comprise a left support rod 11 assembled on the left vertical guide rail 16 in a vertical guiding and moving way and a right support rod 20 assembled on the right vertical guide rail 17 in a vertical guiding and moving way, the lengths of the left support rod 11 and the right support rod 20 are arranged in a left-right extending way, and the tensioning jacks are connected through the cross slideways in a ball hinge structure, the ball pivot structure including connect in the jack-draw with first ball pivot structure between the left side bracing piece with connect in the jack-draw with second ball pivot structure between the right side bracing piece, specific first ball pivot structure, second ball pivot structure are including being fixed in the jack-draw on bulb 12 with be fixed in the bulb seat on corresponding the bracing piece, the bulb seat has bulb chamber 13, the bulb rotates to assemble in the bulb chamber, through the connection of ball pivot structure, make the jack-draw can horizontal hunting and luffing motion, thereby the adjustment is to the stretch-draw angle of steel strand wires, can adjust the control and the upper and lower position that correspond the jack-draw through the cross slide.
The dual-mode self-calibration tensioning equipment further comprises a pressure sensor 7 used for detecting the pressure of liquid inside the corresponding tensioning jack 7, the dual-mode self-calibration tensioning equipment further comprises a standard force sensor 8 arranged corresponding to the tensioning jack, the standard force sensor 8 is arranged on one axial side of the corresponding tensioning jack, and the standard force sensor is provided with a pushing force transmission part 22 used for being pushed and transmitted by a cylinder body or a piston rod of the corresponding tensioning jack. In the present invention, the standard force sensor has a central hole through which the corresponding steel strand passes, and the standard force sensor is a spoke type force sensor.
When in use, as shown in figure 1: after the steel strands 4 penetrate out of the corresponding through holes 1 of the bridge box body 2, the steel strands firstly penetrate through the fixed anchor plate 3, then the steel strands 4 are separated into a certain angle, the left and right positions and the up and down positions of each tensioning jack are adjusted, each steel strand respectively passes through the corresponding tensioning jack, the spherical hinge structure at each tensioning jack enables the tensioning jack to swing left and right and up and down, thereby adapting to the bent steel strand, one end of the standard force sensor far away from the stretching jacks is provided with a stretching anchor plate 9, the stretching anchor plate 9 is connected with the steel strand through a conical anchor, each stretching jack stretches one steel strand, and stopping tensioning when the corresponding steel strand reaches the designed prestress tension, connecting the fixed anchor plate with the corresponding steel strand through the conical anchor, loosening the connection between the tensioning jack and the steel strand, and cutting off the longer end of the steel strand. That is to say, the tensioning equipment in the invention can realize a tensioning mode for the steel strand and also can realize a self-calibration mode, and is the tensioning equipment which can realize a tensioning mode and a self-calibration mode, and is called dual-mode self-calibration tensioning equipment for short.
According to the invention, when a plurality of steel strands 4 are tensioned, each steel strand 4 is tensioned by a corresponding tensioning jack 5, so that each steel strand can reach the designed tensioning force, the left and right positions and the up and down positions of each tensioning jack can be movably adjusted, the swing angle in the left and right directions and the pitch angle in the up and down directions of each tensioning jack can be adaptively adjusted according to the bending angle of the steel strand, the steel strand can conveniently pass through the center of each tensioning jack, the acting force of the elasticity of the steel strand on the tensioning jack in the non-axial direction can be reduced, if the non-axial force exists, the sealing ring of the tensioning jack is very easily damaged, and the service life of the tensioning jack is influenced. Each steel strand corresponds to one tensioning jack, so that the requirement on the maximum tensioning force of each tensioning jack is reduced, the manufacturing cost of the tensioning jack is very low, and the manufacturing cost of the whole double-mode self-calibration tensioning equipment is greatly reduced; the spoke type force sensor can visually read the tension force of the tensioning jack, calibrate the tensioning jack in time and ensure that the steel strand can obtain accurate tensioning prestress.
In other embodiments of the invention: the position of the tensioning jack on the jack bracket can be fixed and unchanged, and the left-right swing angle and the pitching swing angle of the tensioning jack can not be adjusted; the spoke type force sensors can be provided with a plurality of spoke type force sensors without a central hole, and the steel strand penetrates through the spoke type force sensors; the standard force sensor can also be other resistance strain gauge type force sensors; the standard force sensor may also be a force standard as disclosed in chinese patent CN 11039315A; the number of the tensioning jacks can be set according to requirements, such as one, two, three or other numbers.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133135.0A CN111236079B (en) | 2020-03-01 | 2020-03-01 | A dual-mode self-calibrating tensioning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133135.0A CN111236079B (en) | 2020-03-01 | 2020-03-01 | A dual-mode self-calibrating tensioning device |
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| Publication Number | Publication Date |
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| CN111236079A CN111236079A (en) | 2020-06-05 |
| CN111236079B true CN111236079B (en) | 2021-07-23 |
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| CN202010133135.0A Active CN111236079B (en) | 2020-03-01 | 2020-03-01 | A dual-mode self-calibrating tensioning device |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2906574Y (en) * | 2006-05-25 | 2007-05-30 | 长安大学 | Steel Strand Tension Measuring Sensor |
| CN205062666U (en) * | 2015-09-14 | 2016-03-02 | 龙力群 | Push -pull system is opened to bridge prestressing force |
| CN106276684A (en) * | 2016-10-18 | 2017-01-04 | 柳州黔桥工程材料有限公司 | The single pre-tightening apparatus of multipoint mode steel strand wires |
| CN206188303U (en) * | 2016-10-18 | 2017-05-24 | 柳州黔桥工程材料有限公司 | Single preloading device of multipoint mode steel strand wires |
| CN207647512U (en) * | 2017-12-26 | 2018-07-24 | 广州市市政集团有限公司 | A kind of push pipe export ＆ import antipriming |
| CN109141377B (en) * | 2018-09-05 | 2023-09-29 | 国家电网有限公司 | Integrated real-time monitoring device for river water level and flow rate |
| CN211733714U (en) * | 2020-03-01 | 2020-10-23 | 河南交院工程技术有限公司 | Dual-mode self-calibration tensioning equipment |
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2020
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Address after: 450000 No. 165 Nautical Middle Road, Erqi District, Zhengzhou City, Henan Province Applicant after: Henan Jiaoyuan Engineering Technology Group Co.,Ltd. Address before: 450000 No. 165 Nautical Middle Road, Erqi District, Zhengzhou City, Henan Province Applicant before: HENAN JIAOYUAN ENGINEERING TECHNOLOGY Co.,Ltd. |
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