CN114518225B - Rope clamp anti-sliding bearing capacity test device and method based on boom tensioning - Google Patents
Rope clamp anti-sliding bearing capacity test device and method based on boom tensioning Download PDFInfo
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- CN114518225B CN114518225B CN202210154381.3A CN202210154381A CN114518225B CN 114518225 B CN114518225 B CN 114518225B CN 202210154381 A CN202210154381 A CN 202210154381A CN 114518225 B CN114518225 B CN 114518225B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a rope clamp anti-skid bearing capacity test device and a test method based on suspender tensioning, wherein the device comprises a cable tensioning and anchoring system, a test cable and a rope clamp, a suspender tensioning and measuring system and a rope clamp pre-tightening force and displacement measuring system; the device can replay the real stress state and the slippage failure behavior of the cable clamp in an engineering structure, can match and install two main types of cable clamps, namely a pin joint type cable clamp and a straddle type cable clamp, saves the test cost, and can carry out two working condition tests, namely 'short-term loading' and 'long-term load holding'. The test method needs to be implemented based on the device, and the jump or creep of the displacement indicating value of a certain level of suspender under the tension load bearing state is taken as the characteristic of the critical slip state; in the test of short-term loading or long-term load holding, the suspender tension value in a stable state after a critical slip state is used as the test result of the anti-slip bearing capacity or the residual anti-slip bearing capacity of the test cable clamp.
Description
Technical Field
The invention relates to the technical field of bridges and space structure buildings, in particular to a cable clamp anti-sliding bearing capacity test device and a test method based on suspender tensioning.
Background
The main cable of the suspension bridge and the main stay cable of the building cable arch truss structure are important tension bearing members in a large-span structure, and are collectively called as 'cable'. The cable is generally composed of a steel wire bundle consisting of high-strength steel wires, steel strands and steel wire ropes, and has the advantages of light weight, high strength, good flexibility and the like. The cable is provided with cable clamps distributed at certain intervals for hooping the cable, and is connected with tension force transmission components such as a sling (a suspension bridge), a secondary cable or a pull rod (a cable arch truss) and the like to jointly form a cable bearing system. Due to the inclination angle and the unbalance force, the cable clamp is subjected to a pulling force component along the axial direction, and the component causes the cable clamp to generate a sliding tendency, and the sliding tendency is called as a sliding force. The cable clamp is usually composed of two half-piece involutory cable clamp bodies, and is fastened on a cable by a prestressed high-strength bolt pair, so that the cable clamp has certain anti-sliding bearing capacity. The design requires that the anti-sliding bearing capacity of the cable clamp is enough to resist the sliding force generated by a sling, a secondary cable or a pull rod so as to ensure the stable connection of the node of the cable clamp. When the anti-sliding bearing capacity is insufficient, the cable clamp slides along the axial direction of the cable to scratch the surface of the cable, the dislocation of the cable clamp causes the redistribution of the internal force of the structure, the structural rigidity is reduced, and the structural function or safety is influenced. Therefore, the anti-skid bearing capacity of the cable clamp is an important performance index of a suspension bridge and a building cable arch truss structure system.
Although the general empirical calculation formula of the anti-sliding bearing capacity of the cable clamp is given by the industry specification, due to the diversity of the structural form of the cable clamp and the complexity of the stress mode of the cable clamp, the uncertainty of the friction coefficient, the fastening weakening caused by the loosening action of the bolt and other reasons, the sliding failure mode, the actual anti-sliding bearing capacity and the degradation rule of the cable clamp of different types have no uniform knowledge and clear solution. Therefore, the cable clamp anti-sliding bearing capacity test is still a necessary means for researching the cable clamp anti-sliding bearing capacity and engineering inspection.
The anti-sliding bearing capacity test of the cable clamp developed in the current industry is a loading test for pushing the cable clamp along the axial direction of the cable by using a jack, the difference between the loading mode and the stress mode of the cable clamp in the actual structure is obvious, and the actual sliding failure behavior of the cable clamp cannot be replayed, so that the actual anti-sliding bearing capacity of the cable clamp cannot be obtained, and only the nominal friction coefficient of the cable clamp and the friction pair of the cable can be obtained. The inventor's paper, the scientific and numerical students, of the mail slide resistance of the mail cam composed of the upper and lower of the [ J ]. Advances in Structural Engineering,2021,24 (4): 691-705, is hereby incorporated by reference.
Disclosure of Invention
The invention aims to provide a cable clamp anti-sliding bearing capacity test device and a test method based on suspender tensioning, which are used for solving the problems in the prior art and can replay the actual sliding failure behavior of a cable clamp in an engineering structure so as to obtain the actual cable clamp anti-sliding bearing capacity.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a test device for the anti-sliding bearing capacity of a cable clamp based on boom tensioning, which comprises a cable tensioning and anchoring system, a boom tensioning and measuring system, a test cable clamp, a cable clamp bolt pre-tightening force measuring sensor, a cable clamp slippage measuring displacement meter and a displacement meter probe limiting plate, wherein the cable tensioning and anchoring system is connected with the boom tensioning and measuring system through a cable clamp; the cable tensioning and anchoring system is used for tensioning and anchoring the test cable; the test cable clamp is pre-tightened on the tensioned test cable through a cable clamp bolt; after the suspender tensioning measurement system is connected with the test cable clamp, a tensioning suspender is used for applying tension to the test cable clamp; a cable clamp bolt pre-tightening force measuring sensor is mounted on the cable clamp bolt and connected with data acquisition equipment; and a plurality of groups of cable clamp slippage measurement displacement meters and displacement meter probe limiting plates are arranged between the test cable clamp and the test cable.
Preferably, the test cable clamp adopts a pin joint type cable clamp or a straddle type cable clamp, and both the pin joint type cable clamp and the straddle type cable clamp can be matched and connected with the suspender tension measuring system; the pin joint type cable clamp is provided with an ear plate with a pin hole, and the ear plate with the pin hole is in pin joint with a fork ear of the suspender tensioning and measuring system through a pin joint bolt; the straddle type cable clamp is provided with a steel wire rope with a rope ring joint, the steel wire rope straddles in a cable groove of the straddle type cable clamp, and the rope ring joint is sleeved on a rod of a pin joint bolt outside a fork lug to realize connection with a suspender tension measuring system.
Preferably, the suspender tension measuring system comprises fork ears, a connecting bearing plate, foot supports, a suspender tension sensor, a jack, a support pull rod and a counter force support; the pin joint bolt and the fork lug are used for connecting the test cable clamp; the two end areas of the tensioning suspension rod are lathed with threads, one end of the tensioning suspension rod is anchored on the fork lug through a fork lug anchoring nut, and the other end of the tensioning suspension rod is anchored on the head part of the jack through a suspension rod tensioning nut; the counter force generated by the jack ejection is firstly borne by the connecting bearing plate, and the counter force is transmitted to the counter force support through the support pull rod by the connecting bearing plate; the suspender tension sensor and the foot support are padded between the tail part of the jack and the connecting bearing plate; the tensioning suspension rod penetrates through a rod length area at the connecting bearing plate and is turned with a thread, a suspension rod anchoring nut is installed at the thread, the jack can be unloaded after the suspension rod anchoring nut is screwed on the surface of the connecting bearing plate, and at the moment, the tension force of the tensioning suspension rod is transferred to the connecting bearing plate through the suspension rod anchoring nut; when the suspender anchoring nut is in a screwing state, the jack and the suspender tension sensor can be disassembled; the bearing plate anchoring nut and the support anchoring nut are respectively used for bolting two ends of the support pull rod with the top plate of the connecting bearing plate and the counter-force support.
Preferably, the boom tension sensor is a straight-through pressure sensor, the pressure reaction force generated at the tail of the jack and measured by the boom tension sensor is equal to the tension force of the boom, and the boom tension sensor is connected with the data acquisition equipment.
Preferably, the axes of the tensioned test cable and test cable clamp and the tension axis of the tensioning suspension rod form an inclined included angle, and the angle value is determined in advance according to an actual structure or according to test requirements.
The invention also provides a method for testing the anti-skid bearing capacity of the cable clamp based on the suspender tensioning, which is applied to the device for testing the anti-skid bearing capacity of the cable clamp based on the suspender tensioning and comprises the tests of two working conditions of short-term loading and long-term load holding,
the test method of the short-term loading comprises the following steps: after a test cable clamp is fastened according to the pre-tightening force of a specified cable clamp bolt, a tensioning suspension rod is loaded step by step, the pre-tightening force of the cable clamp bolt in the loading process, the tension force of the tensioning suspension rod and the indication value of a cable clamp slippage measurement displacement meter are recorded at the same time until a critical slippage state occurs, a hydraulic pump of the jack is stopped and is loaded until the indication value of the cable clamp slippage measurement displacement meter is stable, and the pre-tightening force of the cable clamp bolt, the tension force of the tensioning suspension rod and the indication value of the cable clamp slippage measurement displacement meter in the stable state are recorded;
the long-term load-bearing test method is that after a test cable clamp is fastened according to the pre-tightening force of a specified cable clamp bolt, the tensioning suspension rod is tensioned according to the tension of a specified tensioning suspension rod; and screwing the anchor nut of the suspender to enable the tensioning suspender to be in a long-term load-holding state, recording real-time data of the cable clamp bolt pretightening force measuring sensor and the cable clamp slippage measuring displacement meter in a test period according to specified frequency, and measuring the residual anti-slip bearing capacity of the test cable clamp according to a short-term loading test method again when the test period is ended.
Compared with the prior art, the invention has the following beneficial technical effects:
the test device disclosed by the invention can simulate the actual stress mode of the cable clamp in an engineering structure by applying a tensile load to the test cable clamp through the suspender, and can carry out tests under 2 working conditions of short-term loading and long-term load holding, so that the actual slippage failure behavior of the cable clamp in the engineering structure can be replayed, and the actual slippage bearing capacity of the cable clamp can be obtained.
Secondly, the testing device disclosed by the invention can be matched with two main types of cable clamps, namely a pin joint type cable clamp and a straddle type cable clamp, one set of device can support anti-sliding tests of various types of cable clamps, and the testing cost is reduced.
The test method disclosed by the invention is based on a suspender tensioning test device and comprises 2 working condition tests of short-term loading and long-term load holding, wherein the short-term loading test can test the anti-sliding bearing capacity of the cable clamp within one day under the set cable clamp pre-tightening force condition; the long-term load holding test can truly recapitulate the actual residual anti-slip bearing capacity of the cable clamp at the end of the preset test period by the inevitable bolt loosening and anti-slip bearing capacity deterioration and later the occurrence of slip failure behaviors during the long-term use of the cable clamp.
Fourthly, defining the anti-sliding bearing capacity or the residual anti-sliding bearing capacity of the cable clamp as a suspender tension value in a stable state 'behind a critical sliding state' by the test method disclosed by the invention; rather than the general standards in the current industry: and the load corresponding to the moment of obvious and rapid increase of the slippage is taken as the judgment basis of the anti-slippage bearing capacity of the cable clamp.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a side view of a boom tension based cable clamp skid resistance test apparatus (installation pinned test cable clamp);
FIG. 2 is an elevation view of a boom tensioning based cable clamp skid resistance test apparatus (installation pinned test cable clamp);
FIG. 3 is a side view of a boom tension based cable clamp skid resistance test apparatus (mounted straddle test cable clamp);
FIG. 4 is an elevational view of a boom tension based cable clamp skid resistance test apparatus (mounted straddle test cable clamp);
FIG. 5 is a schematic view of the arrangement of a cable clamp slippage measurement displacement gauge;
FIG. 6 is a force-displacement graph of a short loading skid resistance test for a pinned cable clamp;
in the figure: 1-cable tensioning and anchoring system, 2-cable tensioning and anchoring system, 3-test cable, 4-cable clamp bolt, 5-pin joint type cable clamp, 6-lug plate, 7-pin joint bolt, 8-fork lug, 9-tensioning suspension rod, 10-connecting bearing plate, 11-foot support, 12-cable clamp bolt pretightening force measuring sensor, 13-fork lug anchoring nut, 14-bearing plate anchoring nut, 15-suspension rod anchoring nut, 16-suspension rod tension sensor, 17-jack, 18-suspension rod tensioning nut, 19-support anchoring nut, 20-counterforce support, 21-support pull rod, 22-straddle type cable clamp, 23-steel wire rope, 24-rope loop joint, 25-cable clamp slippage measuring displacement meter and 26-displacement meter probe limiting plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a cable clamp anti-sliding bearing capacity test device and a test method based on suspender tensioning, which are used for solving the problems in the prior art and can replay the actual sliding failure behavior of a cable clamp in an engineering structure so as to obtain the actual cable clamp anti-sliding bearing capacity.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As shown in fig. 1-6, the present embodiment provides a testing apparatus for anti-sliding bearing capacity of a cable clamp based on boom tensioning, which includes a cable tensioning and anchoring system, a boom tensioning and measuring system, a test cable 3, a test pin-jointed cable clamp 5, a cable clamp bolt pre-tightening force measuring sensor 12, a cable clamp slippage measurement displacement meter 25 and a displacement meter probe limiting plate 26.
The cable tensioning and anchoring system 1 and the cable tensioning and anchoring system 2 are used for tensioning and anchoring two ends of a test cable 3, and a test pin joint type cable clamp 5 is pre-tightened on the tensioned test cable 3 through a cable clamp bolt 4; after the suspender tensioning measurement system is connected with the test cable clamp, tension is applied to the test cable clamp through a tensioning suspender 9, and the tension load of a sling (a inhaul cable or a pull rod) borne by the cable clamp in an actual structure is simulated.
Each cable clamp bolt 4 of the test pin joint type cable clamp 5 is provided with a cable clamp bolt pretightening force measuring sensor 12, and the cable clamp bolt pretightening force measuring sensor 12 is connected with data acquisition equipment and can measure the variation of the pretightening force of the cable clamp bolt 4 in real time; a plurality of sets of cable clamp slippage measurement displacement meters 25 and displacement meter probe limiting plates 26 are arranged between the test pin joint type cable clamp 5 and the test cable 3 to form a plurality of displacement measuring points for measuring the displacement of each part of the cable clamp relative to the cable.
The boom tensioning and measuring system comprises a pin joint bolt 7, a fork ear 8, a tensioning boom 9, a connecting bearing plate 10, a foot support 11, a boom tension sensor 16, a jack 17, a support pull rod 21, a counter-force support 20, a fork ear anchoring nut 13, a boom tensioning nut 18, a boom anchoring nut 15, a bearing plate anchoring nut 14 and a support anchoring nut 19; the pin joint bolt 7 and the fork lug 8 are used for connecting the test cable clamp; the tensioning suspension rod 9 is threaded at two end regions, one end is anchored on the fork ear 8 by a fork ear anchoring nut 13, and the other end is tensioned by the suspension rodThe nut 18 is anchored at the head of the jack 17; the counter force generated by the ejection of the jack 17 is firstly born by the connecting bearing plate 10, and the connecting bearing plate 10 transmits the counter force to the counter force support 20 through the support pull rod 21; a suspender tension sensor 16 and a foot brace 11 are arranged between the tail part of the jack 17 and the connecting support plate 10, the suspender tension sensor 16 is a through type pressure sensor, the measured pressure counter force generated at the tail part of the jack 17 is equal to the tension force of the tension suspender 9, the suspender tension sensor 16 is connected with data acquisition equipment, and the tension change of the tension suspender 9 can be measured in real time; the long rod area where the tension suspender 9 passes through the connecting bearing plate 10 is threaded ， After the boom anchoring nut 15 is installed on the surface of the connecting bearing plate 10 (on one side of the foot support 11) and the boom anchoring nut 15 is screwed on the surface of the connecting bearing plate 10, the jack 17 can be unloaded, at the moment, the boom tension is transmitted to the connecting bearing plate 10 through the boom anchoring nut 15, and the jack 17 and the boom tension sensor 16 can be temporarily detached when the boom anchoring nut 15 is screwed, so that a long-term load holding test can be conveniently carried out; the carrier plate anchor nut 14 and the seat anchor nut 19 are used for bolting both ends of the seat pull rod 21 to the top plate of the connecting carrier plate 10 and the counter force seat 20, respectively.
The axes of the tensioned test cable 3 and the test cable clamp and the tension axis of the tension suspender 9 form a certain inclined included angle (non-vertical relation), the angle value is determined in advance according to the actual structure or the test requirement, and the angle value is measured by angle measuring equipment such as an inclinometer and the like to be used as the known parameter of the test.
Referring to fig. 3 and 4, which are side and elevation views, respectively, of a test apparatus embodying the present invention with a test riding cable clamp 22, the same test apparatus as shown in fig. 1 and 2, it can be seen that two main types of cable clamps can be mated with the same boom tension measurement system: the pin joint type cable clamp 5 is provided with an ear plate 6 with a pin hole, and is in pin joint with a pin joint bolt 7 and a fork ear 8 of a suspender tension measuring system (shown in figures 1 and 2); the straddle type cable clamp 22 is provided with a steel wire rope 23 with a rope ring joint 24, the steel wire rope 23 rides in a cable groove of the straddle type cable clamp 22, and the rope ring joint 24 is sleeved on a rod of the pin joint bolt 7 outside the fork ear 8 plate to realize connection with a suspension rod tension measuring system (as shown in fig. 3 and 4).
The invention discloses a test method of the anti-skid bearing capacity of a cable clamp based on a test device, which comprises the following basic implementation steps: tensioning a test cable 3 by adopting a cable tensioning and anchoring system → pre-tensioning a test cable clamp and installing a cable clamp bolt pre-tensioning force measuring sensor 12 → installing a suspender tensioning and measuring system → formally fastening the test cable clamp → installing a cable clamp slippage measuring displacement meter 25, a displacement meter probe limiting plate 26 → tensioning and loading a tension suspender 9 → processing test data.
Fig. 5 is a schematic layout diagram of the cable clamp slippage measurement displacement meters 25 and the displacement meter probe limiting plates 26 of the test cable clamp, wherein a plurality of displacement meter points are arranged and symmetrically distributed at different positions of the cable clamp, and the arrangement number of the displacement meters is preferably 8.
The test method disclosed by the invention comprises the test of 2 working conditions of short-term loading and long-term load holding; the method for testing the short-term loading comprises the steps of fastening a cable clamp according to the pre-tightening force of a specified cable clamp bolt 4, then loading a tensioning and stretching suspender 9 step by step, simultaneously recording the pre-tightening force of the cable clamp bolt 4 and the indicating value of a tensioning and stretching suspender 9 and a cable clamp slippage measurement displacement meter 25 in the loading process until a critical slippage state appears, stopping a hydraulic pump of a jack 17 at the moment, holding the load until the indicating value of the cable clamp slippage measurement displacement meter 25 is stable (the duration is generally within 20 hours), and recording the pre-tightening force of the cable clamp bolt 4, the tensioning and stretching suspender 9 and the indicating value of the cable clamp slippage measurement displacement meter 25 in the stable state; the long-term load-holding test method comprises the steps of fastening a cable clamp according to the pre-tightening force of a specified cable clamp bolt 4, tensioning a tensioning suspender 9 according to the tension of the specified tensioning suspender 9, wherein the load can not cause the cable clamp to immediately slide and lose efficacy, screwing a suspender anchoring nut 15 to enable the tensioning suspender 9 to be in a long-term load-holding state, recording the real-time data of a cable clamp bolt pre-tightening force measuring sensor 12 and a cable clamp slippage measuring displacement meter 25 in a test period according to specified frequency, and measuring the residual anti-sliding bearing capacity of the cable clamp according to a short-term loading test method when the test period is finished.
The critical slippage state is characterized in that the indication value of the cable clamp slippage measurement displacement meter 25 appears 'jump' or 'creep' under the state that a certain level of suspender tension load is loaded, namely, the constant indication value cannot be maintained in a short time.
In the test, whether the test is the "short-term loading" or the "long-term load holding", the judgment basis of the anti-slip bearing capacity or the remaining anti-slip bearing capacity of the test cable clamp is the tension value of the tension suspender 9 in the "stable state" after the "critical slip state".
Fig. 6 shows a force-displacement curve (a suspension point vertical tension-cable clamp slippage curve) of a short-term loading anti-slip bearing capacity test of the pin joint type cable clamp, wherein the "cable clamp slippage" is an average value of 8 displacement indication values, and as a plurality of displacement meters are arranged in a spatial symmetry manner, a measurement result of the "false slippage" caused by cable bending deformation can be counteracted to the maximum extent after averaging, which is helpful for improving the measurement accuracy of the cable clamp slippage at an initial stage of micro slippage. In the figure, 4 curves are respectively the test results under the conditions that the pretightening force of the bolt of the cable clamp is 83, 103, 121 and 139kN, and the vertical tension value of the lifting point corresponding to the last data point of each curve is the test result of the actual anti-skid bearing capacity of the cable clamp. Because the cable clamp can stably hold load under the condition of the force value, the force value is most consistent with the concept and meaning of the anti-sliding bearing capacity.
In fact, when the slippage of the cable clamp is obviously and rapidly increased, the cable clamp is in an unstable equilibrium (transient equilibrium) state, the force value and the displacement value of the test system are in the process of moment change, the state occurs in a period of time, but not at an accurate moment, and the force value finally selected as the anti-skidding bearing capacity inevitably has certain randomness; furthermore, the recognition of "significant and rapid increase in slippage" comes from the characterization of the force-displacement curve ， The shape of the curve is related to test parameters such as a test loading system, the obtained force-displacement curve has obvious difference due to different loading grades, load holding time and bolt pretightening force, and the corresponding anti-skid bearing capacity is inevitably more discrete, so that the difficulty of test data processing and conclusion analysis is increased. However, based on the technical scheme disclosed by the invention, the suspender tension in the stable state after the ' critical slippage state ' is the tension load held by the cable clamp in the stable balance state, and the suspender tension is the tension which best meets the concept and meaning of ' bearing capacityThe load can be directly determined by the stable indicating value of the suspender tension measuring sensor, a force-displacement curve does not need to be drawn, and artificial judgment does not need to be added.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. The utility model provides a test device of cable clip cling compound bearing capacity based on jib stretch-draw which characterized in that: the device comprises a cable tensioning and anchoring system, a suspender tensioning and measuring system, a test cable clamp, a cable clamp bolt pre-tightening force measuring sensor, a cable clamp slippage measuring displacement meter and a displacement meter probe limiting plate; the cable tensioning and anchoring system is used for tensioning and anchoring the test cable; the test cable clamp is pre-tightened on the tensioned test cable through a cable clamp bolt; after the suspender tensioning measurement system is connected with the test cable clamp, a tensioning suspender is used for applying tension to the test cable clamp; a cable clamp bolt pre-tightening force measuring sensor is mounted on the cable clamp bolt and connected with data acquisition equipment; a plurality of groups of cable clamp slippage measurement displacement meters and displacement meter probe limiting plates are arranged between the test cable clamp and the test cable; the suspender tension measuring system comprises fork lugs, a connecting bearing plate, foot supports, a suspender tension sensor, a jack, a support pull rod and a counter-force support; the pin joint bolt and the fork lug are used for connecting the test cable clamp; threads are turned on the two end areas of the tensioning suspension rod, one end of the tensioning suspension rod is anchored on the fork lug through a fork lug anchoring nut, and the other end of the tensioning suspension rod is anchored on the head of the jack through a suspension rod tensioning nut; the counter force generated by the jack ejection is firstly borne by the connecting bearing plate, and the counter force is transmitted to the counter force support through the support pull rod by the connecting bearing plate; the suspender tension sensor and the foot support are padded between the tail part of the jack and the connecting bearing plate; the tensioning suspension rod penetrates through a rod length area at the connecting bearing plate and is turned with a thread, a suspension rod anchoring nut is installed at the thread, a jack can be unloaded after the suspension rod anchoring nut is screwed on the surface of the connecting bearing plate, and at the moment, the tension force of the tensioning suspension rod is transferred to the connecting bearing plate through the suspension rod anchoring nut; when the suspender anchoring nut is in a screwing state, the jack and the suspender tension sensor can be disassembled; the bearing plate anchoring nut and the support anchoring nut are respectively used for bolting two ends of the support pull rod with the top plate of the connecting bearing plate and the counter-force support.
2. The test device for the anti-sliding bearing capacity of the rope clamp based on the boom tensioning as claimed in claim 1, wherein: the test cable clamp adopts a pin joint type cable clamp or a straddle type cable clamp, and both the pin joint type cable clamp or the straddle type cable clamp can be connected with the suspender tension measuring system in a matching way; the pin joint type cable clamp is provided with an ear plate with a pin hole, and the ear plate with the pin hole is in pin joint with a fork ear of the suspender tension measuring system through a pin joint bolt; the straddle type cable clamp is provided with a steel wire rope with a rope ring joint, the steel wire rope straddles in a cable groove of the straddle type cable clamp, and the rope ring joint is sleeved on a rod of a pin joint bolt outside a fork lug to realize connection with a suspender tension measuring system.
3. The test device for the anti-sliding bearing capacity of the rope clamp based on the boom tensioning as claimed in claim 1, wherein: the boom tension sensor is a straight-through pressure sensor, the pressure counter force generated by the tail of the jack and measured by the boom tension sensor is equal to the tension force of the boom, and the boom tension sensor is connected with the data acquisition equipment.
4. The test device for the anti-sliding bearing capacity of the rope clamp based on the boom tensioning as claimed in claim 1, wherein: and inclined included angles are formed between the axes of the tensioned test cable and the test cable clamp and the tensile force axis of the tensioned suspender, and the angle value of the inclined included angle is determined in advance according to an actual structure or according to test requirements.
5. A method for testing the anti-sliding bearing capacity of a cable clamp based on boom tensioning is applied to the device for testing the anti-sliding bearing capacity of the cable clamp based on boom tensioning as claimed in any one of claims 1-4, and is characterized in that:
comprises the tests of two working conditions of short-term loading and long-term load holding,
the test method of the short-term loading comprises the following steps: after a test cable clamp is fastened according to the pre-tightening force of a specified cable clamp bolt, a tensioning suspension rod is loaded step by step, the pre-tightening force of the cable clamp bolt in the loading process, the tension force of the tensioning suspension rod and the indication value of a cable clamp slippage measurement displacement meter are recorded at the same time until a critical slippage state occurs, a hydraulic pump of the jack is stopped and is loaded until the indication value of the cable clamp slippage measurement displacement meter is stable, and the pre-tightening force of the cable clamp bolt, the tension force of the tensioning suspension rod and the indication value of the cable clamp slippage measurement displacement meter in the stable state are recorded;
the long-term load-bearing test method is that after a test cable clamp is fastened according to the pre-tightening force of a specified cable clamp bolt, the tensioning suspension rod is tensioned according to the tension of a specified tensioning suspension rod; and screwing the suspender anchoring nut to enable the tensioning suspender to be in a long-term load-holding state, recording real-time data of the cable clamp bolt pretightening force measuring sensor and the cable clamp slippage measuring displacement meter in the test period according to specified frequency, and measuring the residual skid resistance bearing capacity of the test cable clamp according to a short-term loading test method when the test period is ended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210154381.3A CN114518225B (en) | 2022-02-21 | 2022-02-21 | Rope clamp anti-sliding bearing capacity test device and method based on boom tensioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210154381.3A CN114518225B (en) | 2022-02-21 | 2022-02-21 | Rope clamp anti-sliding bearing capacity test device and method based on boom tensioning |
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| CN103643636B (en) * | 2013-11-27 | 2015-12-09 | 南京润华市政建设有限公司 | A kind of rigid hanger thrusting slip device and gliding method thereof |
| CN104790301B (en) * | 2015-04-23 | 2018-01-19 | 中铁建设集团有限公司 | A kind of cable-styled bridge system transform hoist cable tensioning one-time-reach-place construction method |
| PL235194B1 (en) * | 2015-08-10 | 2020-06-01 | Escort Spolka Z Ograniczona Odpowiedzialnoscia | A set for mounting a measuring device, preferably the sonar, for monitoring the bottom relief features around the bridge piers, method for mounting of the measuring device by means of such a set and the suspension gear for mounting of the measuring device |
| CN106770481B (en) * | 2016-12-14 | 2023-04-14 | 吉林省公路管理局 | Bridge sling monitoring sensor |
| 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 |
| CN107941402B (en) * | 2017-11-07 | 2023-09-08 | 交通运输部公路科学研究所 | Device and method for measuring inhaul cable force |
| CN209741643U (en) * | 2018-12-12 | 2019-12-06 | 佛山科学技术学院 | real-time monitoring and alarming device and system for displacement of cable clamp of large-span suspension bridge |
| CN210134348U (en) * | 2019-03-18 | 2020-03-10 | 江苏法尔胜缆索有限公司 | Multi-lifting-point temporary sling tensioning system |
| 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 |
| CN111855560A (en) * | 2020-06-08 | 2020-10-30 | 中交二公局第二工程有限公司 | Top tension and compression type cable saddle anti-slip test assembly |
| CN113322834B (en) * | 2021-04-15 | 2022-11-25 | 江苏法尔胜缆索有限公司 | Method for replacing sling of suspension bridge through single-lifting-point tensioning |
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