CN105258929A - PE cable and cable clamp ball connecting performance test method - Google Patents
PE cable and cable clamp ball connecting performance test method Download PDFInfo
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- CN105258929A CN105258929A CN201510698423.XA CN201510698423A CN105258929A CN 105258929 A CN105258929 A CN 105258929A CN 201510698423 A CN201510698423 A CN 201510698423A CN 105258929 A CN105258929 A CN 105258929A
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Abstract
The invention relates to a PE cable and cable clamp ball connecting performance test method. The two ends of a PE cable anchorage device are each equipped with a tension tester. Test cable clamp balls and a brake cable clamp ball are installed in the central area of a PE cable. Parallel hydraulic jacks are arranged between the cable clamp balls. Pushing tool end plates are arranged between the hydraulic jacks and the cable clamp balls to transfer pushing force. The end of each test cable clamp ball is equipped with a displacement meter and a dial indicator which are connected with a dynamic data acquisition system to measure the displacement of the cable clamp balls relative to the PE cable. According to the invention, the most unfavorable slip plane during slipping of a cable clamp ball can be judged visually, the anti-slip friction resistance of a cable clamp ball under different cable forces and different surface contact conditions can be analyzed quickly, and the anti-slip friction coefficient can be calculated to guide cable clamp ball node design.
Description
Technical field
The present invention relates to the experimental study of the resistant slide performance of stretching type rope bar prestressed spatial structure PE rope connected node in a kind of building structure, inquire into antiskid bearing capacity and the sliding friction coefficient of rope ball in the surface treatment situation of different Cable power, different cord clip balls and drag-line, and least favorable glide plane during slippage, for the design of semi-parallel steel wire stay cable with plastic sheath cord clip ball node provides reference frame.
Background technology
In the girder pre-stressed space structure of large-span cable bar, PE drag-line often adopts the form of the elongated layout of one direction, top rigid structure is connected with adopting the form of cord clip ball between drag-line, owing to there is certain angle between rigid bracing and drag-line, rigid bracing axle power can produce larger out-of-balance force internal force in position, cord clip bulb, these uneven internal force need the friction force of cord clip ball and cable body to resist, cord clip ball will be caused to occur to slide along rope length direction thus affect the position shape of rope system when the resistant slide power deficiency of cord clip ball, the stress of cable-strut system and Suo Li will undergo mutation, the PE sheath on the drag-line surface causing the cord clip ball chuck place of holding is torn by more serious situation, affect the holistic resistant behavior of the anticorrosion of cable body and structure, therefore determine that skid resistance frictional coefficient between cord clip ball and cable body and then cord clip ball node form reasonable in design are the keys of total system.
In view of this, the invention provides the change of the test method determination stretching force of a kind of PE rope and cord clip ball switching performance to the influence degree of cord clip ball resistant slide power, this case produces thus.
Summary of the invention
The object of the present invention is to provide the test method of a kind of PE rope and cord clip ball switching performance, the present invention can judge the least favorable glide plane during slippage of cord clip ball intuitively, gone out the resistant slide friction resistance of cord clip ball in different Suo Li and different surfaces contact situation by power, displacement curve analysis, and then extrapolate skid resistance frictional coefficient design.
For achieving the above object, the technical scheme that the present invention specifically provides is: this test comprises PE rope, braking cord clip ball, pushing tow instrument end plate, parallel hydraulic lifting jack, test cord clip ball, pulling test machine and displacement meter.PE cable anchorage two ends arrange pulling test machine; PE rope central region installation test cord clip ball and braking cord clip ball; In the middle of cord clip ball, parallel hydraulic lifting jack is set; Hydraulic jack and cord clip ball centre arrange pushing tow instrument end plate and transmit jacking force; Test cord clip ball end arranges displacement meter and dial gauge, and displacement meter and dial gauge are connected with dynamic data collection system measures cord clip ball and the relative displacement of PE rope.
Concrete process of the test is as follows: step one: carry out test unit connection by above-mentioned; Step 2: at distance braking cord clip ball and test each 0.2m place, cord clip ball both sides the PE sheath of cable body cut off and make it discontinuous; A ring shape mark line is made for judging least favorable glide plane at cord clip ball and PE sheath boundary line and PE sheath and twining package tape boundary line place; Step 3: cable body stretch-draw, the complete rear employing vernier caliper of stretch-draw records cable body diameter under different Suo Li respectively; Step 4: adopt parallel hydraulic lifting jack to carry out hierarchical loading, until cord clip slides; Step 5: record every grade of load phase cord clip displacement of ball value, loads force-displacement curve determination resistant slide power by cord clip ball; Step 6: the outer PE sheath of PE rope and twining package tape are peeled off, and exposed inner galvanized steel tow, changes with the pltine plate of uniform thickness or aluminium sheet, repeat step 3 to five.
Wherein, described step 4 Protonation constant is: the first step: prestrain, make the PE rope between braking cord clip ball and test cord clip ball be in tensioned state, fine setting pushing tow instrument end plate makes it stressed at same axis, reads dial gauge initial reading set by cord clip ball end simultaneously; Second step: hierarchical loading, every grade is 20kN, holds lotus 10min for every grade, continues to load until cord clip occurs obviously to slide.
Described step 3 stretching force is respectively 0,0.1T, 0.2T, 0.3T, 0.4T, 0.5T(wherein T be the Breaking load of PE rope).
Advantage of the present invention:
Described pulling test machine is connected with cable tensios control room, according to testing requirements for drag-line provides different stretching forces, and the placement parallel with pulling test workbench of PE rope.
Described test cord clip ball all adopts the pretightning force of high-strength bolt to be connected with cable body with braking cord clip ball, simultaneously as loading counter-force point during test, need ensure that the resistant slide power of braking cord clip ball is greater than test cord clip ball, on the one hand by arranging two braking cord clip balls, and compacting holds out against between cord clip ball, braking cord clip ball adopts the high-strength bolt of a specification larger than test cord clip ball to provide larger pretightning force on the other hand.
Described need fixed at the enterprising rower of laboratory profession equipment (in parallel initiatively demarcate) with the supporting precision pressure gauge be connected of parallel hydraulic lifting jack; Parallel hydraulic lifting jack need be evenly arranged in around cable body, and make power transmission even, lifting jack quantity configures as required.
Described pushing tow instrument end plate is made up of upper and lower two halves, and adopt plain bolt to connect, end plate arranges one piece of arc stiffener every 90 degree, and stiffener curved end and cord clip ball are fitted and transmitted jacking force.
When described displacement meter and dial gauge are installed, ensure that its finger slips direction is parallel with drag-line, and use punching limiting plate its pointer contact point spacing.
Described step 6 pltine plate is cast in proportion by zinc and copper and is formed, and possesses certain deformability, ensures to press close to be engaged with galvanized steel tow under the pretightning force effect of high-strength bolt, and available aluminium sheet is replaced.
In a word, test unit of the present invention is simple, and test findings is directly perceived, and test figure is reliable.
Accompanying drawing explanation
Fig. 1 is the cord clip ball connected node of rigid bracing and PE rope in beam-string structure;
Fig. 2 is cord clip ball slip resistance experiment general assembly drawing;
Fig. 3 is cord clip ball and PE rope connected node sectional drawing;
Fig. 4 substitutes cord clip ball connected node after PE sheath for adopting uniform thickness pltine plate or aluminium sheet;
Fig. 5 is pushing tow instrument end plate schematic diagram.
In figure: 1-rigid rod, 2-rigid bracing, 3-cord clip ball, 4-PE rope, 5-braking cord clip ball, 6-test cord clip ball, 7-pushing tow instrument end plate, 8-parallel hydraulic lifting jack, 9-pulling test machine, 10-cord clip ball episphere, 11-cord clip ball lower semisphere, 12-high-strength bolt, 13-galvanized steel tow, 14-high-density polyethylene plastics sheath (PE sheath), 15-pltine plate or aluminium sheet, 16-fan-shaped pushing tow end plate, 17-pushing tow stiffener one, 18-pushing tow stiffener two.
Embodiment
1-5 by reference to the accompanying drawings, is described in further details the embodiment of the present invention.
PE rope 4 specification adopted in the present embodiment is Φ 7X397, and cable body diameter is 183mm, and wherein steel tendon diameter is 153mm, PE jacket thickness is 15mm, and Breaking load is 25515KN; The stretching force during test of PE rope is respectively 0KN, 2551KN, 5102KN, 7653KN, 10204KN, 12755KN; Pulling test machine 9 specification is 2000T.
Cord clip ball 3 material is G20Mn5QT, the cord clip ball 3 cast is shaped through machine work, and roughness requirements reaches Ra≤50 μm, and cord clip ball 3 contacts medial surface with PE rope and adopts electric welding wharf's pavement quality, high-strength bolt hole machined adopts joins driller's skill, the normal perforation of bolt when guaranteeing to construct; Test cord clip ball 6 overall diameter is 360mm, and interior diameter is 183mm, and high-strength bolt 12 specification is 4M24,10.9 grades; Braking cord clip ball 5 high-strength bolt 12 specification is 4M27,10.9 grades;
Pushing tow instrument end plate 7 is made up of two pieces of fan-shaped pushing tow end plates, 16, two pieces of pushing tow stiffeners, one 17, two pieces of pushing tow stiffeners 2 18, wherein pushing tow stiffener arranges curved end and cord clip ball 3 outside surface is fitted, upper and lower two pieces of fan-shaped pushing tow end plates 16 adopt the plain bolt be arranged on pushing tow stiffener 2 18 to connect, and need ensure that four pieces of stiffeners and the compacting of cord clip outer surface of ball hold out against and evenly transmit jacking force when pushing tow instrument end plate 7 is installed.
High-strength bolt 12, is used for connecting cord clip ball upper and lower two hemisphere, clamps PE rustling sound body 4 by the pretightning force of high-strength bolt 12, should symmetrical, classification execute stubborn during high-strength bolt 12 pretension, guarantees the overall stressed homogeneity of bolt after pretension;
Pltine plate 15 is cast in proportion by zinc and copper and is formed, and by certain deformability, ensures to press close to be engaged with steel tendon 13 under the pretightning force effect of high-strength bolt 12, and available aluminium sheet is replaced.
Fig. 2 general assembly drawing connects: be fixed on pulling test machine 9 by PE rope 4 two ends of band ground tackle, and PE cable body 4 is with worktable keeping parallelism and in vacant state; Installation test cord clip ball 6 and braking cord clip ball 5, need to hold out against between braking cord clip ball 6 two cord clip balls; Install pushing tow instrument end plate 7, pushing tow instrument end plate 7 is vertical with cable body length direction, and four pieces of arc stiffeners and the compacting of cord clip outer surface of ball hold out against; Parallel hydraulic lifting jack 8 is installed, lifting jack is horizontally disposed in PE rope 4 both sides, lifting jack is consistent to the distance of worktable and PE rope, front and back end holds out against with pushing tow instrument end plate 7 respectively, connect the precision pressure gauge supporting with hydraulic jack oil pump, this tensimeter is fixed accurately corresponding with the jacking force of the reading with hydraulic jack that ensure pressure fuel pump table at the enterprising rower of laboratory profession equipment; Connect displacement meter and dial gauge, ensure that its finger slips direction is parallel with drag-line, and using punching limiting plate its pointer contact point spacing, displacement meter is connected with dynamic data collection system with dial gauge, and the displacement data gathered inputs in computing machine by dynamic data collection system.
PE rustling sound folder ball glide plane is determined: at distance braking cord clip ball 5 and test each 0.2m place, cord clip ball 6 both sides, the PE sheath 14 of cable body is cut off making it discontinuous; A ring shape mark line is made for judging glide plane with PE sheath 14 boundary line and PE sheath 14 with twining package tape boundary line place at test cord clip ball 6.
Test one: test under different Suo Li.Carry out the loading under 0KN Suo Li state, first prestrain is carried out, the PE rope 4 between braking cord clip ball 5 and test cord clip ball 6 is made to be in tensioned state, fine setting pushing tow instrument end plate 7 makes it stressed at same axis, read dial gauge initial reading set by cord clip ball end simultaneously, then by every grade of 20KN hierarchical loading, hold lotus 10min for every grade, record every one-level load bottom offset meter and feed back to displacement readings on computing machine, continue to load until obvious slip occurs test cord clip ball 6; Process of the test under all the other Suo Li is the same.
Test two: folder pltine plate.The outer PE sheath 14 of PE rope 4 and twining package tape are peeled off, exposed inner galvanized steel tow 13, change with the pltine plate of uniform thickness or aluminium sheet 15, pltine plate 15 is made up of upper and lower two semicircles, cord clip ball 3 clamps pltine plate 15 makes it press close to be engaged with steel tendon 13, makes a ring shape mark line for judging glide plane at test cord clip ball 6 with pltine plate 15 boundary line and pltine plate 15 with steel tendon 13 boundary line place; The slip resistance experiment under various different Suo Li is carried out by above identical load mode.
Test cord clip ball 3 least favorable glide plane is determined: judge least favorable glide plane according to annulet linear location.
The change of cable body diameter and cord clip ball resistant slide power under different Suo Li state: PE rope 4 diameter under the different Suo Li state of vernier caliper record; Jacking force-the displacement curve analysis drawn under various Suo Li determines the maximum resistant slide power under this Suo Li; The maximum resistant slide power-cable stretching force curve determination cable stretching power under different Suo Li of drawing is on the impact of maximum resistant slide power.
Cord clip ball resistant slide power in different surfaces contact situation: test cord clip ball 6 under contrasting identical Suo Li situation and press from both sides PE sheath 14 and maximum resistant slide power when folder pltine plate or aluminium sheet 15.
Cord clip ball skid resistance frictional coefficient μ=F/(k × P); The wherein maximum resistant slide power of cord clip ball determined of F-test, k-fastening and pressure distribution nonuniformity coefficient get the total pretightning force of 2.8, P-high-strength bolt.
Claims (3)
1. a test method for PE rope and cord clip ball switching performance, is characterized in that, described test procedure is as follows:
Step one: test unit is connected;
Step 2: at distance braking cord clip ball and test each 0.2m place, cord clip ball both sides the PE sheath of cable body cut off and make it discontinuous; A ring shape mark line is made for judging least favorable glide plane at cord clip ball and PE sheath boundary line and PE sheath and twining package tape boundary line place;
Step 3: cable body stretch-draw, the complete rear employing vernier caliper of stretch-draw records cable body diameter under different Suo Li respectively;
Step 4: adopt parallel hydraulic lifting jack to carry out hierarchical loading, until cord clip slides;
Step 5: record every grade of load phase cord clip displacement of ball value, by cord clip ball loading force displacement curve determination resistant slide power;
Step 6: the outer PE sheath of PE rope and twining package tape are peeled off, and exposed inner galvanized steel tow, changes with the pltine plate of uniform thickness or aluminium sheet, repeat step 3 to five.
2. the test method of a kind of PE rope according to claim 1 and cord clip ball switching performance, it is characterized in that: described step 4 loads and can be divided into: a prestrain, the PE rope between braking cord clip ball and test cord clip ball is made to be in tensioned state, fine setting pushing tow instrument end plate makes it stressed at same axis, reads dial gauge initial reading set by cord clip ball end simultaneously; B hierarchical loading, every grade is 20kN, holds lotus 10min for every grade, continues to load until cord clip occurs obviously to slide.
3. the test method of a kind of PE rope according to claim 1 and cord clip ball switching performance, is characterized in that: described test unit comprises PE rope, braking cord clip ball, pushing tow instrument end plate, parallel hydraulic lifting jack, test cord clip ball, pulling test machine and displacement meter; Wherein, PE cable anchorage two ends arrange pulling test machine; PE rope central region installation test cord clip ball and braking cord clip ball; In the middle of cord clip ball, parallel hydraulic lifting jack is set; Hydraulic jack and cord clip ball centre arrange pushing tow instrument end plate and transmit jacking force; Test cord clip ball end arranges displacement meter and dial gauge, and displacement meter and dial gauge are connected with dynamic data collection system measures cord clip ball and the relative displacement of PE rope.
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| CN201510698423.XA CN105258929B (en) | 2015-10-23 | 2015-10-23 | A kind of test method of PE rope and cord clip ball switching performance |
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| CN201510698423.XA CN105258929B (en) | 2015-10-23 | 2015-10-23 | A kind of test method of PE rope and cord clip ball switching performance |
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| CN105258929B CN105258929B (en) | 2019-04-16 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105865906A (en) * | 2016-05-31 | 2016-08-17 | 沈阳盛远检测技术有限公司 | Centering positioning clamping device for compressing sample |
| CN107655755A (en) * | 2017-07-25 | 2018-02-02 | 东南大学 | A kind of test method of drag-line cord clip assembly resistant slide bearing capacity |
| CN108561505A (en) * | 2018-06-22 | 2018-09-21 | 杨维国 | A kind of three valve type cord clip apparatus and its application method considering cable body durability |
| CN110907152A (en) * | 2019-11-15 | 2020-03-24 | 中铁大桥局第七工程有限公司 | Rotary cable clamp test device and test method |
| CN111487120A (en) * | 2020-05-04 | 2020-08-04 | 东南大学 | Anti-slip bearing capacity test system and method for bent inhaul cable and cable clamp assembly part |
| CN114486528A (en) * | 2022-02-09 | 2022-05-13 | 中建八局第三建设有限公司 | Test method for anti-sliding bearing capacity of bent inhaul cable and cable clamp assembly |
| CN117433831A (en) * | 2023-12-20 | 2024-01-23 | 南京建凯建设项目管理有限公司 | Sampling and cutting device for building engineering detection |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105865906A (en) * | 2016-05-31 | 2016-08-17 | 沈阳盛远检测技术有限公司 | Centering positioning clamping device for compressing sample |
| CN105865906B (en) * | 2016-05-31 | 2018-07-13 | 沈阳盛远检测技术有限公司 | Compress sample centering positioning clamping device |
| CN107655755A (en) * | 2017-07-25 | 2018-02-02 | 东南大学 | A kind of test method of drag-line cord clip assembly resistant slide bearing capacity |
| CN107655755B (en) * | 2017-07-25 | 2020-02-18 | 东南大学 | Testing method for anti-sliding bearing capacity of stay cable-cable clamp assembly part |
| CN108561505A (en) * | 2018-06-22 | 2018-09-21 | 杨维国 | A kind of three valve type cord clip apparatus and its application method considering cable body durability |
| CN110907152A (en) * | 2019-11-15 | 2020-03-24 | 中铁大桥局第七工程有限公司 | Rotary cable clamp test device and test method |
| CN111487120A (en) * | 2020-05-04 | 2020-08-04 | 东南大学 | Anti-slip bearing capacity test system and method for bent inhaul cable and cable clamp assembly part |
| CN111487120B (en) * | 2020-05-04 | 2022-03-18 | 东南大学 | Anti-slip bearing capacity test system and method for bent inhaul cable and cable clamp assembly part |
| CN114486528A (en) * | 2022-02-09 | 2022-05-13 | 中建八局第三建设有限公司 | Test method for anti-sliding bearing capacity of bent inhaul cable and cable clamp assembly |
| CN117433831A (en) * | 2023-12-20 | 2024-01-23 | 南京建凯建设项目管理有限公司 | Sampling and cutting device for building engineering detection |
| CN117433831B (en) * | 2023-12-20 | 2024-03-15 | 南京建凯建设项目管理有限公司 | Sampling and cutting device for building engineering detection |
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