CN217006730U - Anti bearing capacity test system that slides of cable and cable clamp built-up member buckle - Google Patents
Anti bearing capacity test system that slides of cable and cable clamp built-up member buckle Download PDFInfo
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- CN217006730U CN217006730U CN202220262902.2U CN202220262902U CN217006730U CN 217006730 U CN217006730 U CN 217006730U CN 202220262902 U CN202220262902 U CN 202220262902U CN 217006730 U CN217006730 U CN 217006730U
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- cable clamp
- inhaul
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Abstract
The utility model provides a bending inhaul cable and cable clamp assembly part anti-sliding bearing capacity test system, which comprises: a reaction frame; the inhaul cable is arranged on the reaction frame; two ends of the inhaul cable respectively penetrate through two sides of the reaction frame and are fastened through a cable head nut, and an inclined base plate is arranged between the cable head nut and the reaction frame; the cable clamp is arranged in the reaction frame and clamped on the inhaul cable through a plurality of high-strength bolts; a displacement sensor is arranged on the inhaul cable; the tensioning jack is arranged at one end of the inhaul cable; a tensioning support is arranged between the tensioning jack and the reaction frame, and the tensioning jack is fastened through a tensioning nut; and the pushing jack is arranged at the inner end of one side of the reaction frame close to the tensioning jack. The comprehensive friction coefficient between the cable body and the cable clamp is calculated by determining the anti-sliding bearing capacity of the cable clamp through a jacking force-slippage curve and combining the effective fastening force of the high-strength bolt, the cable force of the inhaul cable and the bending angle.
Description
Technical Field
The utility model relates to the technical field of anti-sliding bearing capacity of a stay cable and cable clamp assembly part, in particular to a bending stay cable and cable clamp assembly part anti-sliding bearing capacity test system.
Background
The cable structure is a prestressed structure system formed by using a guy cable as a main stress member, and is widely applied to large-span bridges and house buildings. The inhaul cable is generally a steel strand, a steel wire rope or a steel wire bundle which is made of high-strength steel wires, and has the advantages of high strength, light weight, high fatigue resistance, good flexibility and the like.
The cable clamp in the cable structure is used as a connecting node for clamping a cable body and generally comprises a main body, a pressing plate and a high-strength bolt. The main body and the pressure plate are provided with cable hole channels; the high-strength bolt is connected with the main body and the pressing plate, and the main body and the pressing plate clamp the cable body by applying pretightening force to the high-strength bolt, so that enough friction force is generated to resist unbalanced cable force on two sides of the cable clamp. The technical specification of the cable structure (JCJ25712) requires: the cable body should not slide in the cable clamp, and the friction force between the cable clamp and the cable body should be greater than the difference of the cable forces of the cable bodies on the two sides of the cable clamp. In the European Specification, "Eurocode 3" (EN 1993-1-11: 2006), section6.4.1, it is clear that the load in the direction perpendicular to the channel of the cable clamp should be taken into account when calculating the slip resistance of the cable clamp.
In cable structure engineering, the problem of cable clamp slippage resistance is well received by technicians in various stages of structure design, construction and normal use. If the cable clamp cannot provide enough anti-sliding bearing capacity, not only the spatial configuration of the connected components is changed, but also the structural performance is changed, and even safety accidents can be caused.
The anti-sliding bearing capacity of the cable clamp depends on the friction coefficient between the cable body and the cable clamp, the effective fastening force of the high-strength bolt and the transverse pressure of the bent inhaul cable on the cable clamp hole.
The main factors influencing the effective fastening force of the high-strength bolt are as follows: the pre-tightening force value of the high-strength bolt and the diameter of the self stress relaxation cable body are changed. The pretightening force of the high-strength bolt is the initial tension generated in the screw rod during construction and tightening of the high-strength bolt and is a direct factor influencing the fastening force. The larger the pretightening force is, the larger the effective fastening force of the residual high-strength bolt is after self stress relaxation and cable diameter change is, and the smaller the effective fastening force is otherwise; the tension of the high-strength bolt can be relaxed with time, resulting in the loss of the fastening force of the high-strength bolt. Due to the poisson effect, the diameter of the cable body is reduced due to the axial stretching of the inhaul cable, and the creep effect of the transverse compression of the cable body is caused, so that the effective fastening force of the high-strength bolt is reduced, and the anti-sliding bearing capacity of the cable clamp is reduced.
The transverse pressure of the bent inhaul cable on the cable clamp hole channel depends on the cable force and the bending angle and is in direct proportion to the cable force and the bending angle. The greater the transverse pressure, the more advantageous the cable clamp is for skid resistance.
In order to reduce the cost of the cable head, cable clamp nodes are often adopted in engineering, and a communicated cable body penetrates through a plurality of cable clamp nodes to be connected with adjacent components. Due to the mechanical property that the guy cable is only pulled, the guy cable passing through the cable clamp is generally bent, such as a lower chord cable in a beam string, a ring cable of a string dome and the like. However, in the conventional cable clamp anti-sliding test, the bent inhaul cable-cable clamp is often simplified into the straight inhaul cable-cable clamp, and the influence of the transverse pressure of the bent inhaul cable on the anti-sliding performance of the cable clamp in the actual engineering is ignored, so that the simplified straight inhaul cable-cable clamp anti-sliding test is inconsistent with the bent inhaul cable-cable clamp anti-sliding performance of the actual engineering.
Disclosure of Invention
Aiming at the prior art, the utility model provides a system for testing the anti-sliding bearing capacity of a bent inhaul cable and cable clamp assembly.
The utility model provides a bending inhaul cable and cable clamp assembly part anti-sliding bearing capacity test system, which comprises:
the reaction frame is of a frame structure;
the inhaul cable is arranged on the reaction frame; two ends of the inhaul cable respectively penetrate through two sides of the reaction frame and are fastened through a cable head nut, an inclined base plate is arranged between the cable head nut and the reaction frame, and a cable force sensor is arranged between the cable head nut and the inclined base plate;
the cable clamp is arranged in the reaction frame and clamped on the inhaul cable through a plurality of high-strength bolts; a fastening force sensor is arranged on the high-strength bolt; a displacement sensor is arranged on the inhaul cable;
the tensioning jack is arranged at one end of the inhaul cable; a tensioning support is arranged between the tensioning jack and the reaction frame, and the tensioning jack is fastened through a tensioning nut;
the pushing jack is arranged at the inner end of one side of the reaction frame, which is close to the tensioning jack, and a jacking force sensor is arranged between the pushing jack and the cable clamp.
Preferably, a cable head support is further arranged between the cable head nut and the inclined base plate.
Preferably, the inner end of the reaction frame is provided with a sliding support, and the sliding support is connected with the cable clamp in a sliding manner through a jacking rolling shaft.
Preferably, a sliding gasket is arranged between the cable clamp and the jacking roller.
Preferably, the sliding support is made of steel material.
Preferably, the reaction frame is formed by splicing a plurality of steel plates and fixing bolts.
Compared with the prior art, the utility model has the beneficial effects that: the stay bending angle, the stay clamp pore passage and the test process in the test system are highly consistent with the actual stress and the construction process of bending the stay and the stay clamp, the influence of the stay bending and the tension, the high-strength bolt stress relaxation, the cable body creep and the time effect on the anti-sliding bearing capacity of the stay clamp is fully considered, the anti-sliding bearing capacity of the stay clamp is determined through a jacking force-slippage curve, and the comprehensive friction coefficient between the cable body and the stay clamp is calculated by combining the effective fastening force of the high-strength bolt, the cable force of the stay and the bending angle. In addition, when the inclined gasket is replaced by the vertical gasket, the test system can also be used for a linear inhaul cable.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
The tension device comprises a reaction frame 1, a reaction frame 2, a stay cable 3, a cable head nut 4, an inclined backing plate 5, a cable head support 6, a cable clamp 7, a high-strength bolt 8, a tensioning jack 9, a tensioning support 10, a tensioning nut 11, a pushing jack 12, a sliding support 13, a jacking roller 14 and a sliding gasket.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further explained below by combining the specific drawings.
Examples
A bending inhaul cable and cable clamp assembly anti-sliding bearing capacity test system is shown in figure 1 and comprises: the reaction frame 1 is characterized in that the reaction frame 1 is of a frame structure formed by splicing a plurality of steel plates and fixing bolts, so that the size of the reaction frame can be conveniently adjusted; the reaction frame 1 is provided with a guy cable 2, two ends of the guy cable 2 respectively penetrate through two sides of the reaction frame 1 and are fastened through a cable head nut 3, an inclined base plate 4 is arranged between the cable head nut 3 and the reaction frame 1, and a cable force sensor and a cable head support 5 are arranged between the cable head nut 3 and the inclined base plate 4; the inside of the reaction frame 1 is provided with a cable clamp 6, the cable clamp 6 is clamped on a cable body of the inhaul cable 2 through a plurality of high-strength bolts 7, the high-strength bolts 7 are provided with fastening force sensors, and the inhaul cable 2 is also provided with a displacement sensor.
Furthermore, one end of the inhaul cable 2 is provided with a tensioning jack 8, a tensioning support 9 is arranged between the tensioning jack 8 and the reaction frame 1, and the tensioning jack 8 is fastened through a tensioning nut 10; two pushing jacks 11 are arranged at the inner end of one side of the reaction frame 1 close to the tensioning jack 8, a jacking force sensor is arranged between the pushing jacks 11 and the cable clamp 6, a sliding support 12 is arranged at the inner end of the reaction frame 1, the sliding support 12 is made of steel materials, the sliding support 12 is in sliding connection with the cable clamp 6 through a jacking roller 13, and a sliding gasket 14 is arranged between the cable clamp 6 and the jacking roller 13.
The test method of this example is as follows:
s1, installing a pull rope: install cable 2 on the reaction frame 1 of frame type, make the cable head screw rod at 2 both ends of cable pass the both sides of frame type reaction frame 1 respectively, all install cable head nut 3 on the cable head screw rod at 2 both ends of cable and fasten, install oblique backing plate 4 between cable head nut 3 at both ends and reaction frame 1, install cable force sensor between cable head nut 3 at both ends and oblique backing plate 4, cable force sensor inserts data acquisition system and gathers in real time for real-time supervision cable force changes, and installs cable head support 5 between cable head nut 3 of one end and oblique backing plate 4, and oblique backing plate 4 can support 5 circular arcs along cable head and slide, and adapts to different cable bending angle.
S2, mounting a locking clamp: the middle part of the cable body of the inhaul cable 2 is provided with a locking clamp 6, a fastening force sensor is arranged on a high-strength bolt 7 on the locking clamp 6, the fastening force sensor is connected into a data acquisition system to carry out real-time acquisition and is used for monitoring the fastening force change of the high-strength bolt 7 in real time and pre-fastening the high-strength bolt 7 until the fastening force reaches the design pre-fastening force, and a bent inhaul cable-cable clamp assembly part is formed.
S3, applying an initial cable force: the bending inhaul cable-cable clamp assembly part is stood, the attenuation condition of the fastening force of the high-strength bolt is monitored and data acquisition is carried out at the same time until the attenuation of the fastening force of the high-strength bolt 7 is stable, a sliding support 12 is transversely installed at the inner end of the reaction frame 1, a jacking roller 13 and a sliding gasket 14 are installed between the sliding support 12 and the cable clamp 6 and used for transversely fixing the cable clamp 6, meanwhile, the influence on the anti-sliding bearing capacity of the cable clamp can be reduced, and the initial cable force is applied to the inhaul cable 2 through an external transverse jack.
S4, installing a tensioning jack: and a tensioning jack 8 is arranged at one end of the inhaul cable 2 far away from the cable head support 5, a tensioning support 9 is arranged between the tensioning jack 8 and the reaction frame 1, and a tensioning nut 10 is arranged at the outer end of the tensioning jack 8 for fastening.
S5, adjusting cable force: the initial cable force of the inhaul cable 2 is adjusted through the tensioning jack 8, formal cable force is applied through an external transverse jack, the formal cable force reaches design cable force, the bending angle of the inhaul cable 2 reaches design angle, the formal cable force of the inhaul cable 2 is maintained to stand under the design cable force, and the fastening force of the high-strength bolt 7 is attenuated and stabilized again to consider the influence of time effect on the anti-sliding bearing capacity of the cable clamp.
S6, installing a jacking jack: the inner end of one side close to the tensioning jack 11 on the reaction frame 1 is provided with a jacking jack 11, a jacking force sensor is arranged between the jacking jack 11 and the cable clamp 6, the jacking force sensor is connected into a data acquisition system for real-time acquisition, and is used for monitoring a jacking force value in real time, two displacement sensors are arranged on the cable 2, the displacement sensors are connected into the data acquisition system for real-time acquisition, and are used for respectively measuring the slippage of the main body of the cable clamp 6 and the pressure plate relative to the cable body of the cable 2, the two displacement sensors are fixed on the cable body of the cable 2, the thimble supports the main body and the pressure plate of the cable clamp 6 respectively, and the stretching direction is parallel to the cable body.
S7, pushing the cable clamp: the cable clamp 6 is pushed in a grading manner by a pushing jack 11, cable tensioning is carried out before the cable clamp 6 is pushed in the grading manner, so that the influence of the cable tension on the anti-sliding bearing capacity of the cable clamp is considered, a loading system with large grading and small grading is adopted for grading pushing loading, when the cable clamp 6 starts to generate small displacement, small-load grading loading is changed, a proper grading loading value is selected according to the estimation of the anti-sliding bearing capacity of the cable clamp, the fastening force of a high-strength bolt 7, the pushing force of the pushing jack 11 and the sliding quantity of the cable clamp 6 are synchronously monitored until the sliding quantity of the cable clamp 6 is rapidly increased and the pushing force is difficult to continue to increase, and pushing is stopped;
s8, processing test data: determining the anti-sliding bearing capacity of the cable clamp according to a top thrust-slippage curve, and calculating the comprehensive friction coefficient between the cable 2 and the cable clamp 6 by combining the fastening force of the high-strength bolt 7, the cable force and the bending angle of the cable 2;
the fastening force is the residual fastening force after the high-strength bolt 7 is pre-tightened and subjected to stress relaxation through a series of test processes, and the fastening force is the force for effectively clamping the cable body during final pushing and sliding.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are also within the scope of the present invention.
Claims (6)
1. The utility model provides a buckle cable and cable clamp assembly spare anti bearing capacity test system that slides which characterized in that includes:
the reaction frame is of a frame structure;
the inhaul cable is arranged on the reaction frame; two ends of the inhaul cable respectively penetrate through two sides of the reaction frame and are fastened through cable head nuts, an inclined base plate is arranged between the cable head nuts and the reaction frame, and a cable force sensor is arranged between the cable head nuts and the inclined base plate;
the cable clamp is arranged in the reaction frame and clamped on the inhaul cable through a plurality of high-strength bolts; a fastening force sensor is arranged on the high-strength bolt; a displacement sensor is arranged on the inhaul cable;
the tensioning jack is arranged at one end of the inhaul cable; a tensioning support is arranged between the tensioning jack and the reaction frame, and the tensioning jack is fastened through a tensioning nut;
the pushing jack is arranged at the inner end of one side of the reaction frame, which is close to the tensioning jack, and a jacking force sensor is arranged between the pushing jack and the cable clamp.
2. The bending cable and cable clamp assembly anti-slip bearing capacity test system according to claim 1, wherein a cable head support is further arranged between the cable head nut and the inclined backing plate.
3. The bending cable and cable clamp assembly anti-slip bearing capacity test system according to claim 1, wherein the inner end of the reaction frame is provided with a slip support, and the slip support is connected with the cable clamp in a sliding mode through a jacking roller.
4. The bending cable and cable clamp assembly anti-slip bearing capacity test system according to claim 3, wherein a sliding gasket is arranged between the cable clamp and the jacking roller.
5. The bend cable and cable clamp assembly slippage resistance test system of claim 3, wherein the slippage support is made of steel.
6. The bending cable and cable clamp assembly anti-slip bearing capacity test system according to claim 1, wherein the reaction frame is formed by splicing a plurality of steel plates and fixing bolts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220262902.2U CN217006730U (en) | 2022-02-09 | 2022-02-09 | Anti bearing capacity test system that slides of cable and cable clamp built-up member buckle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220262902.2U CN217006730U (en) | 2022-02-09 | 2022-02-09 | Anti bearing capacity test system that slides of cable and cable clamp built-up member buckle |
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| CN217006730U true CN217006730U (en) | 2022-07-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220262902.2U Active CN217006730U (en) | 2022-02-09 | 2022-02-09 | Anti bearing capacity test system that slides of cable and cable clamp built-up member buckle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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- 2022-02-09 CN CN202220262902.2U patent/CN217006730U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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