Pre-stress damper and pre-stress determination method and system

Abstract

The invention provides a pre-stress damper and a pre-stress determining method and system. The pre-stress damper comprises a gap type steel strand, an assembled integral hammer head and an anchoring clamp. The gap type steel strand comprises a central layer round wire, a middle layer type wire and an outer layer round wire from inside to outside; a gap is formed between the central layer round line and the middle layer molded line, and the gap is filled with lubricating grease, so that the frictional resistance between the central layer round line and the middle layer molded line is reduced, and the central layer round line is conveniently pre-stressed; the molded line of the middle layer is of an arch body structure, the inertia moment to the circle center is increased through the arch body structure, and the flexural rigidity of the steel strand is enhanced; the two ends of the center layer round wire are connected with the assembled integral hammer head, the anchoring clamp is assembled on the hollow portion of the end, away from the center layer round wire, of the assembled integral hammer head and used for clamping the center layer round wire where target stress is pre-applied, and the tensile stress generated by impact load can firstly offset the tensile stress formed between the outer layer round wire and the middle layer folded wire after the stress is pre-applied; and the bending rigidity of the steel strand can be increased.

Description

Technical Field

[0001] The invention relates to the field of vibration reduction devices for power transmission lines, and in particular to a prestressed vibration-proof hammer and a method and system for determining the prestress. Background Art

[0002] In areas with strong winds, the conductors of power transmission projects will be subjected to significant impacts due to wind swaying. Under such significant impacts, the conductors will undergo dynamic responses such as vibration, swing or deformation, causing conductor material fatigue. In severe cases, strand breakage accidents may even occur. Therefore, anti-vibration hammers are usually installed on transmission lines to absorb or weaken vibration energy, change the line swing frequency, prevent line vibration or swaying, and keep the conductors in a relatively stable state.

[0003] The current bending stiffness design of the anti-vibration hammer steel strand is designed to meet the anti-vibration performance of the anti-vibration hammer under breeze vibration conditions, and is suitable for the dynamic response of the conductor under breeze vibration conditions; however, under the action of large impact loads in strong wind areas, the steel strand of the anti-vibration hammer on the conductor is prone to obvious plastic deformation due to insufficient bending stiffness, thereby affecting its anti-vibration effect; and the existing dynamic characteristic test of the anti-vibration hammer is also a test method under breeze vibration conditions, and the value range of the bending stiffness and damping coefficient of the anti-vibration hammer steel strand is not suitable for the calculation of the dynamic characteristics of the anti-vibration hammer under strong wind and large impact loads. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a prestressed anti-vibration hammer, comprising:

[0005] Gap-type steel strand 1, assembled integral hammer head 3 and anchoring fixture;

[0006] The gap-shaped steel strand 1 includes, from the inside to the outside, a center layer round wire 13, a middle layer shaped wire 12 and an outer layer round wire 11; a gap 14 is provided between the center layer round wire 13 and the middle layer shaped wire 12, and the gap 14 is filled with grease; and the lengths of the middle layer shaped wire 12 and the outer layer round wire 11 are shorter than the center layer round wire 13; the middle layer shaped wire 12 is an arch structure;

[0007] The two ends of the central layer round wire 13 are respectively connected to an assembled integral hammer head 3, and the middle position of each assembled integral hammer head 3 away from one end of the central layer round wire 13 is a hollow part, and the anchoring fixture is assembled in the hollow part;

[0008] The anchoring fixture is used to clamp the center layer round wire 13 after the target stress is pre-applied by an external tensioning tool; the gap-type steel strand 1 and the assembled integral hammer head 3 are coupled and connected through the center layer round wire 13 after the target stress is pre-applied.

[0009] Optionally, a center hole is provided at one end of the assembled integral hammer head 3 close to the center layer circular line 13;

[0010] The two ends of the center layer round wire 13 pass through the center holes of the assembled integral hammer head 3 at one end, respectively, and the anchoring fixture is clamped on the center layer round wire 13 that passes through the center hole and is pre-stressed with the target stress;

[0011] The gap-type steel strand 1 is coupled to the assembled integral hammer head 3 with the anchoring clamp provided therein, through the center layer round wire 13 passing through the center hole clamped by the anchoring clamp.

[0012] Optionally, the anti-vibration hammer further includes a wire clamp 2 , one end of which is clamped in the middle of the outer round wire 11 , and the other end is sleeved on the external conductor; the assembled integral hammer head 3 is symmetrically distributed on both sides of the wire clamp 2 .

[0013] Optionally, the assembled integral hammer head 3 includes a concave hammer head 23 and a convex hammer head 31, wherein the concave hammer head 23 is concave inwardly at one end away from the line clamp 2 and is closely attached to the convex hammer head 31 protruding outwardly; the convex hammer head 31 is open and hollow at one end away from the concave hammer head 23, and the opening direction is away from the concave hammer head 23, and the anchoring fixture is assembled in the hollow part of the convex hammer head 31;

[0014] The center holes include a first center hole 22 opened in the concave hammer head and a second center hole 33 opened in the convex hammer head 31 ; the center layer circular wire 13 passes through the first center hole 22 and the second center hole 33 in sequence.

[0015] Optionally, the diameters of the first center hole 22 and the second center hole 33 are smaller than the diameter of the gap-shaped steel strand 1 , and larger than the diameter of the center layer round wire 13 .

[0016] Optionally, the concave hammer head 23 has a U-shaped structure at one end close to the wire clamp 2 , the opening of the U-shaped structure faces the wire clamp 2 , and a steel sleeve 21 is fixedly installed in the concave part of the opening of the U-shaped structure, and the steel sleeve 21 is sleeved on the outside of the outer round wire 11 .

[0017] Optionally, an anchoring clamp embedding groove 32 is respectively provided on the upper and lower edges of the hollow part of the convex hammer head 31 , the anchoring clamp embedding groove 32 is close to the second center hole 33 , and the anchoring clamp is assembled in the anchoring clamp embedding groove 32 .

[0018] Optionally, the anchor clamp includes an upper clamp 41 and a lower clamp 42, and the upper clamp 41 and the lower clamp 42 are both wedge-shaped structures. The upper clamp 41 is clamped with the anchor clamp embedded groove 32 set at the upper edge, and the lower clamp 42 is clamped with the anchor clamp embedded groove 32 set at the lower edge. After clamping, the wedge-shaped structures of the upper clamp 41 and the lower clamp 42 are opposite to each other at the side, and the center layer circular wire 13 is clamped between the upper clamp 41 and the lower clamp 42.

[0019] Optionally, the intermediate layer profile 12 includes:

[0020] A plurality of profile wires, the cross section of which is a quadrilateral that is wide at the top and narrow at the bottom, are twisted and extruded in the same direction around a central layer round wire 13 to form an arch structure.

[0021] The present invention also provides a method for determining the prestress of a vibration-proof hammer steel strand, comprising:

[0022] Performing a dynamic test on a vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load;

[0023] Performing a dynamic test on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load;

[0024] Based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, the value of the prestress is adjusted to obtain the target stress of the anti-vibration hammer steel strand;

[0025] Wherein, the anti-vibration hammer steel strand is the aforementioned gap-type steel strand of the anti-vibration hammer.

[0026] Optionally, adjusting the value of the prestress to obtain the target stress of the anti-vibration hammer steel strand based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load comprises:

[0027] If the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the same impact load is within the preset stiffness ratio range, the value of the prestress is taken as the target stress of the anti-vibration hammer steel strand;

[0028] If under the same impact load, the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand is not within the preset stiffness ratio range, the prestress is adjusted and the second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand is recalculated until the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness is within the stiffness ratio range, and the prestress value at this time is used as the target stress of the anti-vibration hammer steel strand.

[0029] Optionally, the performing of a dynamic test on the vibration-proof hammer steel strand without prestress to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load comprises:

[0030] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand.

[0031] The damping ratio of the anti-vibration hammer steel strand is obtained by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration;

[0032] The vibration signal of the anti-vibration hammer steel strand after the impact load is applied is processed by a data acquisition analyzer to obtain the natural frequency of the anti-vibration hammer steel strand;

[0033] The static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0034] Optionally, the method of obtaining the static bending stiffness of the anti-vibration hammer steel strand by using the weight of a weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand comprises:

[0035] The weight of the weight and the deflection of the anti-vibration hammer steel strand at the critical point of yield of the anti-vibration hammer steel strand are obtained by using the strain gauge, which is recorded as the maximum deflection;

[0036] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight and the maximum deflection combined with the calculation formula of the static bending stiffness.

[0037] Optionally, the calculation formula of the static bending stiffness is:

[0038]

[0039] Among them, k represents the static bending stiffness of the anti-vibration hammer steel strand; F represents the load on the free end of the anti-vibration hammer steel strand, that is, the weight of the weight connected to the anti-vibration hammer steel strand; l represents the distance from the midpoint of the anti-vibration hammer steel strand to the connection between the anti-vibration hammer steel strand and the hammer head; h max Indicates the maximum deflection.

[0040] Optionally, the damping ratio of the anti-vibration hammer steel strand is obtained by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration, including:

[0041] Apply an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to obtain a vibration attenuation curve of the anti-vibration hammer steel strand generated by attenuated vibration;

[0042] According to the amplitude values ​​of two different vibration periods in the vibration attenuation curve and the calculation formula of the damping ratio, the damping ratio of the anti-vibration hammer steel strand is obtained.

[0043] Optionally, the damping ratio is calculated as follows:

[0044]

[0045] Where, ζ represents the damping ratio of the anti-vibration hammer steel strand; b represents the interval period value between two vibration cycles; a represents the ath vibration cycle; u a It represents the amplitude value of the ath vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand; u a+b It represents the amplitude value of the a+bth vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand.

[0046] Optionally, the static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with a calculation formula for the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, including:

[0047] The damping of the anti-vibration hammer steel strand is calculated by using the mass, damping ratio and natural frequency of the anti-vibration hammer steel strand and combining the damping calculation formula.

[0048] The static bending stiffness, damping and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the dynamic bending stiffness calculation formula to calculate the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0049] Optionally, the dynamic bending stiffness calculation formula is:

[0050]

[0051] Among them, k d represents the dynamic bending stiffness of the anti-vibration hammer steel strand, k represents the static bending stiffness of the anti-vibration hammer steel strand; m represents the mass of the anti-vibration hammer steel strand; ω represents the excitation frequency of the anti-vibration hammer steel strand; c represents the damping of the anti-vibration hammer steel strand.

[0052] Based on the same inventive concept, the present invention also provides a system for determining the prestress of a vibration-proof hammer steel strand, comprising:

[0053] The first dynamic bending stiffness determination module is used to perform a dynamic test on the vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load;

[0054] The second dynamic bending stiffness determination module is used to perform a dynamic test on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load;

[0055] A target stress determination module is used to adjust the value of the prestress to obtain the target stress of the anti-vibration hammer steel strand based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load;

[0056] Wherein, the anti-vibration hammer steel strand is the aforementioned gap-type steel strand of the anti-vibration hammer.

[0057] Optionally, the target stress determination module is specifically used for:

[0058] If the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the same impact load is within the preset stiffness ratio range, the value of the prestress is taken as the target stress of the anti-vibration hammer steel strand;

[0059] If under the same impact load, the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand is not within the preset stiffness ratio range, the prestress is adjusted and the second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand is recalculated until the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness is within the stiffness ratio range, and the prestress value at this time is used as the target stress of the anti-vibration hammer steel strand.

[0060] Optionally, the first dynamic bending stiffness determination module is specifically used to:

[0061] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand.

[0062] The damping ratio of the anti-vibration hammer steel strand is obtained by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration;

[0063] The vibration signal of the anti-vibration hammer steel strand after the impact load is applied is processed by a data acquisition analyzer to obtain the natural frequency of the anti-vibration hammer steel strand;

[0064] The static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0065] Optionally, the first dynamic bending stiffness determination module obtains the static bending stiffness of the anti-vibration hammer steel strand by using the weight of a weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand, including:

[0066] The weight of the weight and the deflection of the anti-vibration hammer steel strand at the critical point of yield of the anti-vibration hammer steel strand are obtained by using the strain gauge, which is recorded as the maximum deflection;

[0067] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight and the maximum deflection combined with the calculation formula of the static bending stiffness.

[0068] Optionally, the calculation formula of the static bending stiffness in the first dynamic bending stiffness determination module is:

[0069]

[0070] Among them, k represents the static bending stiffness of the anti-vibration hammer steel strand; F represents the load on the free end of the anti-vibration hammer steel strand, that is, the weight of the weight connected to the anti-vibration hammer steel strand; l represents the distance from the midpoint of the anti-vibration hammer steel strand to the connection between the anti-vibration hammer steel strand and the hammer head; h max Indicates the maximum deflection.

[0071] Optionally, the first dynamic bending stiffness determination module obtains the damping ratio of the anti-vibration hammer steel strand by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration, including:

[0072] Apply an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to obtain a vibration attenuation curve of the anti-vibration hammer steel strand generated by attenuated vibration;

[0073] According to the amplitude values ​​of two different vibration periods in the vibration attenuation curve and the calculation formula of the damping ratio, the damping ratio of the anti-vibration hammer steel strand is obtained.

[0074] Optionally, the calculation formula of the damping ratio in the first dynamic bending stiffness determination module is:

[0075]

[0076] Where, ζ represents the damping ratio of the anti-vibration hammer steel strand; b represents the interval period value between two vibration cycles; a represents the ath vibration cycle; u a It represents the amplitude value of the ath vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand; u a+b It represents the amplitude value of the a+bth vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand.

[0077] Optionally, the first dynamic bending stiffness determination module uses the static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand when subjected to an impact load, combined with a calculation formula for the dynamic bending stiffness of the anti-vibration hammer steel strand, to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, including:

[0078] The damping of the anti-vibration hammer steel strand is calculated by using the mass, damping ratio and natural frequency of the anti-vibration hammer steel strand and combining the damping calculation formula.

[0079] The static bending stiffness, damping and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the dynamic bending stiffness calculation formula to calculate the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0080] Optionally, the dynamic bending stiffness calculation formula in the first dynamic bending stiffness determination module is:

[0081]

[0082] Among them, k d represents the dynamic bending stiffness of the anti-vibration hammer steel strand, k represents the static bending stiffness of the anti-vibration hammer steel strand; m represents the mass of the anti-vibration hammer steel strand; ω represents the excitation frequency of the anti-vibration hammer steel strand; c represents the damping of the anti-vibration hammer steel strand.

[0083] Based on the same inventive concept, the present invention also provides a computer device, including: one or more processors;

[0084] A memory for storing one or more programs;

[0085] When the one or more programs are executed by the one or more processors, the method for determining the prestressing of the anti-vibration hammer steel strand as described above is implemented.

[0086] Based on the same inventive concept, the present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, a method for determining the prestressing of a vibration-proof hammer steel strand as described above is implemented.

[0087] Compared with the closest prior art, the present invention has the following beneficial effects:

[0088] The present invention provides a prestressed anti-vibration hammer, comprising: a gap-shaped steel strand, an assembled integral hammer head and an anchoring fixture; the gap-shaped steel strand comprises a center layer round wire, a middle layer profile wire and an outer layer round wire from the inside to the outside in sequence; a gap is arranged between the center layer round wire and the middle layer profile wire, the gap is filled with grease, and the lengths of the middle layer profile wire and the outer layer round wire are shorter than the center layer round wire; the middle layer profile wire is an arch structure; two ends of the center layer round wire are respectively connected to an assembled integral hammer head, and the middle position of each assembled integral hammer head away from one end of the center layer round wire is a hollow part, and the anchoring fixture is assembled in the hollow part; the anchoring fixture is used for tensioning the steel strand using an external tensioning process The center layer round wire is clamped after pre-applying target stress; after the center layer round wire is pre-applied target stress, the outer layer round wire and the middle layer profile wire are compressed, and the tensile stress generated under the vertical impact load must first offset the compressive stress of the outer layer and the middle layer profile wire, thereby reducing the tensile stress of the outer layer and the middle layer profile wire of the steel strand, increasing the bending stiffness of the gap-type steel strand, and achieving better vibration prevention effect; wherein, the middle layer profile wire forms an arch structure, which increases the moment of inertia about the center of circle, and changes the contact between the strands from line to surface contact, so that the force between the strands is more uniform, and there will be no stress concentration like when the round wire strands are in contact, thereby enhancing the bending stiffness.

[0089] In addition, a prestressed anti-vibration hammer of the present invention is provided with a gap between the center layer round wire and the middle layer profile wire, and grease is filled in the gap. This structural measure is used to reduce the friction resistance between the center layer round wire and the middle layer profile wire, facilitates the application of prestress to the center layer round wire, reduces the wear between the center layer round wire and the middle layer profile wire, reduces the probability of strand breakage, and prolongs the life of the gap-type steel strand.

[0090] Different from the traditional anti-vibration hammer steel strand and hammer crimping connection method, the prestressed anti-vibration hammer is connected through the coupling between the gap-type steel strand and the assembled integral hammer (that is, the center layer round wire of the prestressed gap-type steel strand is clamped by the anchor clamp in the assembled integral hammer). The prestressed center layer round wire is clamped by the built-in anchor clamp of the assembled integral hammer, so as to increase the stiffness of the steel strand; at the same time, the prestressed center layer round wire is clamped by the anchor clamp, so that the assembled integral hammer of the built-in anchor clamp is fixed at both ends of the gap-type steel strand.

[0091] A method and system for determining the prestress of an anti-vibration hammer steel strand, comprising: performing a dynamic test on an anti-vibration hammer steel strand that is not prestressed to obtain a first dynamic bending stiffness of the anti-vibration hammer steel strand under an impact load; performing a dynamic test on a prestressed anti-vibration hammer steel strand to obtain a second dynamic bending stiffness of the anti-vibration hammer steel strand under an impact load; adjusting the value of the prestress based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load to obtain a target stress of the anti-vibration hammer steel strand, thereby achieving a dynamic characteristic test of the anti-vibration hammer steel strand under a large impact load and a selection of the prestress of the steel strand. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] Figure 1 A partial structural cross-sectional view of a prestressed anti-vibration hammer provided by the present invention;

[0093] Figure 2 A top view of the structure of a prestressed anti-vibration hammer provided by the present invention;

[0094] Figure 3 It is a schematic diagram of the cross section of the gap-type steel strand;

[0095] Figure 4 This is a schematic diagram of the force on the pre-tensioned gap-type steel strand;

[0096] Figure 5 It is a structural schematic diagram of a concave hammer head;

[0097] Figure 6 It is a structural schematic diagram of a convex hammer head;

[0098] Figure 7is a structural schematic diagram of the anchoring clamp;

[0099] Figure 8 It is a structural schematic diagram of the gap-type steel strand near one end of the assembled integral hammer head;

[0100] Fig. 9 A schematic flow chart of a method for determining prestressing of a vibration-proof hammer steel strand provided by the present invention;

[0101] Fig.10 This is a schematic diagram of the power test model;

[0102] Fig.11 is the vibration attenuation curve of the steel strand;

[0103] Fig.12 A schematic diagram of the process for adjusting the prestress;

[0104] Fig.13 A structural schematic diagram of a system for determining prestressing of a steel strand with an anti-vibration hammer provided by the present invention;

[0105] Among them, 1-gap-type steel strand, 2-wire clamp, 3-assembled integral hammer, 11-outer layer round wire, 12-middle layer shaped wire, 13-center layer round wire, 14-gap, 21-steel casing, 22-first center hole, 23-concave hammer, 31-convex hammer, 32-anchor clamp embedding groove, 33-second center hole, 41-upper clamp, 42-lower clamp, 43-third center hole. DETAILED DESCRIPTION

[0106] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0107] Embodiment 1:

[0108] The present invention provides a prestressed anti-vibration hammer, such as Figure 1 and Figure 2 As shown, it comprises: a gap-shaped steel strand 1, an assembled integral hammer head 3 and an anchoring fixture; the gap-shaped steel strand 1 comprises a center layer round wire 13, a middle layer profile wire 12 and an outer layer round wire 11 from the inside to the outside, a gap 14 is arranged between the center layer round wire 13 and the middle layer profile wire 12, and the gap 14 is filled with grease; and the length of the middle layer profile wire 12 and the outer layer round wire 11 is shorter than that of the center layer round wire 13; as shown Figure 3The intermediate layer profile 12 shown is an arch structure; the two ends of the center layer round wire 13 are respectively connected to an assembled integral hammer head 3, and the middle position of each assembled integral hammer head 3 away from one end of the center layer round wire 13 is a hollow part, and the anchoring clamp is assembled in the hollow part; the anchoring clamp is used to clamp the center layer round wire 13 after the target stress is pre-applied by an external tensioning tool; the gap-type steel strand 1 and the assembled integral hammer head 3 are coupled and connected through the center layer round wire 13 after the target stress is pre-applied.

[0109] like Figure 4 As shown, by applying pre-tension to the center layer round wire 13, the stress of the steel strand will be redistributed. Since the outer layer wire strands and the middle layer profile wire 12 of the steel strand are twisted structures, the stress and deformation of these two strands are consistent. Therefore, while the center layer round wire 13 is pulled, the outer layer round wire 11 and the middle layer profile wire 12 are compressed. The tensile stress generated under the vertical impact load must first offset the compressive stress of the outer layer and the middle layer profile wire 12, thereby reducing the tensile stress of the outer layer and the middle layer profile wire 12 of the steel strand, increasing the bending stiffness of the gap-type steel strand 1, and achieving better vibration prevention effect. Among them, the pre-stress of the center layer round wire 13 is generally 2%T-5%T, where T is the tensile strength of the wire strands of the steel strand.

[0110] Among them, the width of the gap 14 is set to (0.5mm-1mm), and the gap 14 is set between the center layer round wire 13 and the middle layer molded wire 12; the gap 14 is filled with grease to reduce the friction resistance between the center layer round wire 13 and the middle layer molded wire 12, so as to facilitate the application of prestress to the center layer round wire, reduce the wear between the center layer round wire 13 and the middle layer molded wire 12, and thus reduce the probability of strand breakage and extend the life of the strand.

[0111] The middle layer profile wire 12 includes: a plurality of profile wires, the cross section of the profile wire is a quadrilateral that is wide at the top and narrow at the bottom, and the plurality of profile wires are twisted and extruded in the same direction around the center layer round wire 13 to form an arch structure.

[0112] The cross section of the profile can be approximately a quadrilateral with a wide top and a narrow bottom. The wide top means that the profile is wide on one side of the intermittent steel strand 1 close to the outer round wire 11, and the narrow bottom means that the profile is narrow on one side of the intermittent steel strand 1 close to the center round wire 13. Figure 3 shown.

[0113] The arch structure formed by multiple profile wires in the middle layer increases the moment of inertia about the center of the circle and changes the contact between the strands from line to surface. Therefore, after the middle layer profile wire 12 is changed from a round wire to a profile wire, the contact surface area between the strands is increased, so that the force between the strands is more uniform, and there will be no stress concentration like when the strands are in contact with round wires, thereby enhancing the bending stiffness; and the moment of inertia of the middle layer profile wire 12 is larger than that of the round wire, thereby increasing the bending stiffness of the middle layer profile wire 12; the center layer round wire 13 and the outer layer round wire 11 of the gap-shaped steel strand 1 are round wires.

[0114] The assembled integral hammer head 3 has a center hole at one end close to the center layer round wire 13; the two ends of the center layer round wire 13 pass through the center holes of the assembled integral hammer head 3 at their respective ends, and the anchoring clamp is clamped on the center layer round wire 13 that has passed through the center hole and has been pre-stressed with the target stress; the gap-type steel strand 1 is coupled and connected to the assembled integral hammer head 3 with the built-in anchoring clamp through the center layer round wire 13 that passes through the center hole.

[0115] Among them, the center layer round wire 13 passing through the center hole part is the center layer round wire 13 after the outer layer round wire 11 and the middle layer profile wire 12 are stripped from the gap-shaped steel strand 1. The length of the middle layer profile wire 12 and the outer layer round wire 11 is shorter than the center layer round wire 13 because it is necessary to use an external tensioning tool to pre-stress the center layer round wire 13.

[0116] The anti-vibration hammer further comprises a wire clamp 2, one end of which is clamped in the middle of the outer round wire 11, and the other end of which is sleeved on the external conductor.

[0117] The wire clamp 2 is sleeved with the external wire at one end and clamps the outer round wire 11, i.e. the gap-type steel stranded wire 1, at the other end to connect the anti-vibration hammer to the external wire; the assembled integral hammer head 3 is symmetrically distributed on both sides of the wire clamp 2.

[0118] like Figure 5-Figure 6 As shown, the assembled integral hammer head 3 includes a concave hammer head 23 and a convex hammer head 31, and the concave hammer head 23 is concave inward at one end away from the line clamp 2 and protrudes outward closely against the convex hammer head 31; the convex hammer head 31 is open and hollow at one end away from the concave hammer head 23, and the opening direction is away from the concave hammer head 23, and the anchoring clamp is assembled in the hollow part of the convex hammer head 31; the center hole includes a first center hole 22 opened in the concave hammer head 23 and a second center hole 33 opened in the convex hammer head 31; the center layer round wire 13 passes through the first center hole 22 and the second center hole 33 in sequence.

[0119] Among them, the center layer round wire 13 passes through the first center hole 22 and the second center hole 33 in sequence, and then enters the interior of the anchoring clamp. The center layer round wire 13 is prestressed by a tensioning tool, and the prestressed center layer round wire 13 is clamped by the anchoring clamp. The length of the center layer round wire 13 after the outer layer round wire 11 and the middle layer shaped wire 12 of the gap-shaped steel strand 1 is stripped is equal to the axial length of the convex hammer head.

[0120] The diameters of the first center hole 22 and the second center hole 33 are smaller than the diameter of the gap-shaped steel strand 1 , and larger than the diameter of the center layer round wire 13 .

[0121] After the center layer round wire 13 of the gap-type steel strand 1 is stripped of the outer layer round wire 11 and the middle layer profile wire 12 and passes through the first center hole 22, the outer layer round wire 11 and the middle layer profile wire 12 are abutted against the first center hole 22, ensuring that the center layer round wire 13 does not move significantly when the tensioning tool pre-stresses the center layer round wire 13, and enabling the convex hammer head 31 and the concave hammer head 23 to be more tightly combined into a whole with a smooth surface.

[0122] The concave hammer head 23 has a U-shaped structure at one end close to the wire clamp 2 , with the opening of the U-shaped structure facing the wire clamp 2 . A steel sleeve 21 is fixedly installed in the concave part of the opening of the U-shaped structure, and the steel sleeve 21 is sleeved on the outside of the outer round wire 11 .

[0123] An anchoring fixture embedding groove 32 is respectively provided at the upper and lower edges of the hollow part of the convex hammer head 31 . The anchoring fixture embedding groove 32 is closely attached to the second center hole 33 , and the anchoring fixture is assembled in the anchoring fixture embedding groove 32 .

[0124] like Figure 7 As shown, the anchoring clamp includes an upper clamp 41 and a lower clamp 42, and the upper clamp 41 and the lower clamp 42 are both wedge-shaped structures. The upper clamp 41 is clamped with the anchoring clamp embedded groove 32 set at the upper edge, and the lower clamp 42 is clamped with the anchoring clamp embedded groove 32 set at the lower edge. After clamping, the wedge-shaped structures of the upper clamp 41 and the lower clamp 42 are opposite to each other at the side to form a space for the center layer circular wire 13 to pass through, which can be called a third center hole. The center layer circular wire 13 is clamped between the upper clamp 41 and the lower clamp 42.

[0125] When the anchoring fixture assembled in the integrated hammer head 3 is used to clamp the center layer round wire 13 of the gap-type steel strand 1, as shown in FIG. Figure 8As shown, the gap-shaped steel strand 1 is stripped to obtain a center layer round wire 13, the gap-shaped steel strand 1 is inserted into the steel pipe sleeve of the concave hammer head 23, the outer layer round wire 11 and the middle layer shaped wire 12 are against the first center hole 22 of the concave hammer head 23, the center layer round wire 13 passes through the first and second center holes in sequence and enters the second center hole 33, and then the upper clamp 41 and the lower clamp 42 of the anchor clamp are used to clamp the prestressed center layer round wire 13.

[0126] After the center layer round wire 13 is prestressed and clamped, the tensile stress generated under the vertical impact load must first offset the compressive stress of the outer and middle layer profile wires 12, thereby reducing the tensile stress of the outer and middle layer profile wires 12 of the steel strand, increasing the bending stiffness of the gap-type steel strand 1 and achieving a better anti-vibration effect.

[0127] Different from the traditional anti-vibration hammer steel strand and hammer crimping connection method, the prestressed anti-vibration hammer is connected through the coupling between the gap-type steel strand 1 and the assembled integral hammer 3 (i.e., the center layer round wire 13 of the prestressed gap-type steel strand 1 is clamped by the anchoring clamp in the assembled integral hammer 3). The prestressed center layer round wire 13 is clamped by the built-in anchoring clamp in the assembled integral hammer 3, thereby achieving the purpose of increasing the rigidity of the steel strand; at the same time, the prestressed center layer round wire 13 is clamped by the anchoring clamp, so that the assembled integral hammer 3 with the built-in anchoring clamp is fixed at both ends of the gap-type steel strand 1.

[0128] Example 2

[0129] The present invention provides a method for determining the prestress of a vibration-proof hammer steel strand, which is used to provide a method for determining the value of the prestress of a prestressed vibration-proof hammer in Example 1, such as Fig. 9 As shown, including:

[0130] S1. Performing a dynamic test on a vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load;

[0131] S2. Performing a dynamic test on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load;

[0132] S3. Based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, the value of the prestress is adjusted to obtain the target stress of the anti-vibration hammer steel strand.

[0133] The anti-vibration hammer steel strand is the gap-type steel strand of the anti-vibration hammer in Example 1.

[0134] Among them, the dynamic test of the anti-vibration hammer steel strand before and after prestressing can be carried out by separately carrying out the dynamic test on the same anti-vibration hammer steel strand before and after prestressing, or by selecting two anti-vibration hammer steel strands of the same specification to carry out the dynamic test before and after prestressing.

[0135] In step S1, a dynamic test is performed on the vibration-proof hammer steel strand without prestress to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load, which specifically includes:

[0136] S11. The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand.

[0137] Specifically, the weight of the weight at the critical yield point of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand at this time are obtained by using the strain gauge, which is recorded as the maximum deflection.

[0138] Optionally, use Fig.10 The dynamic test model shown obtains the maximum deflection of the anti-vibration hammer steel strand at the critical yield point. The test model includes: a strain gauge, an acceleration sensor and a weight. The anti-vibration hammer steel strand clamp 2 is held in the test model, and the strain gauge is pasted at the position of the anti-vibration hammer steel strand connecting wire clamp 2. The acceleration sensor is connected to one end of the anti-vibration hammer steel strand connected to the hammer head, and the weight is connected to one end of the anti-vibration hammer steel strand connected to the hammer head. The weight of the weight is added according to the test requirements. In this embodiment, the weight of the weight is gradually increased at one end of the anti-vibration hammer steel strand connected to the hammer head, and the strain gauge is used to obtain the critical yield point of the anti-vibration hammer steel strand, and then the maximum deflection is obtained.

[0139] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight and the maximum deflection combined with the calculation formula of the static bending stiffness.

[0140] The calculation formula of the static bending stiffness of the anti-vibration hammer steel strand is obtained through the deflection curve equation, and the deflection curve equation of the anti-vibration hammer steel strand is:

[0141]

[0142] Among them, h(x) represents the deflection of the anti-vibration hammer steel strand at position x, x represents the position on the anti-vibration hammer steel strand, is 0 at the midpoint of the anti-vibration hammer steel strand (i.e., the connection between the anti-vibration hammer steel strand and the wire clamp), and is l at the connection between the anti-vibration hammer steel strand and the hammer head; k represents the static bending stiffness of the anti-vibration hammer steel strand; F represents the load on the free end of the anti-vibration hammer steel strand; l represents the distance from the midpoint of the anti-vibration hammer steel strand to the connection between the anti-vibration hammer steel strand and the hammer head. According to this formula, the deflection at the connection between the anti-vibration hammer steel strand and the hammer head is the largest, and the maximum deflection is:

[0143]

[0144] The calculation formula of the static bending stiffness of the anti-vibration hammer steel strand is obtained by conversion. The calculation formula of the static bending stiffness is:

[0145]

[0146] Among them, k represents the static bending stiffness of the anti-vibration hammer steel strand; F represents the load on the free end of the anti-vibration hammer steel strand, that is, the weight of the weight connected to the anti-vibration hammer steel strand; l represents the distance from the midpoint of the anti-vibration hammer steel strand to the connection between the anti-vibration hammer steel strand and the hammer head; h max Indicates the maximum deflection.

[0147] S12. Obtain the damping ratio of the anti-vibration hammer steel strand by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration.

[0148] Specifically, an impact load is applied to one end of the anti-vibration hammer steel strand connected to the hammer head to obtain a vibration attenuation curve of the anti-vibration hammer steel strand. A load is applied to one end of the anti-vibration hammer steel strand connected to the hammer head to generate a certain initial displacement, and then unloaded to make the anti-vibration hammer steel strand generate free attenuation vibration. The vibration attenuation curve of the attenuation vibration generated by the anti-vibration hammer steel strand after unloading is recorded, such as Fig.11 As shown, TD represents a vibration cycle, u1 represents the first vibration cycle, and u i represents the ith vibration period, u i+1 Indicates the i+1th vibration period, according to the amplitude values ​​of two different vibration periods in the vibration attenuation curve, combined with the calculation formula of the damping ratio, the damping ratio of the anti-vibration hammer steel strand is obtained. The calculation formula of the damping ratio is:

[0149]

[0150] Where, ζ represents the damping ratio of the anti-vibration hammer steel strand; b represents the interval period value between two vibration cycles; a represents the ath vibration cycle; u a It represents the amplitude value of the ath vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand; u a+b It represents the amplitude value of the a+bth vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand.

[0151] S13. A data acquisition analyzer is used to process the vibration signal of the anti-vibration hammer steel strand after the impact load is applied to obtain the natural frequency of the anti-vibration hammer steel strand.

[0152] Specifically, the natural frequency of the anti-vibration hammer steel strand can be measured using the autospectral analysis method. The test steps are as follows: install the acceleration sensor at one end of the anti-vibration hammer steel strand, connect the output signal to the vibration test channel, turn on the power of the test instrument, enter the DAS2003 data acquisition and analysis software, set various operating parameters, select the single frequency response analysis function, and obtain the natural frequency of the anti-vibration hammer steel strand.

[0153] S14. Utilize the static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand when subjected to impact load, in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand, to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0154] Specifically, S141, using the mass, damping ratio and natural frequency of the anti-vibration hammer steel strand, combined with the damping calculation formula, calculate the damping of the anti-vibration hammer steel strand; the damping calculation formula of the anti-vibration hammer steel strand is:

[0155] C = 2mw n ζ

[0156] Where, c represents the damping of the anti-vibration hammer steel strand; ζ represents the damping ratio of the anti-vibration hammer steel strand; w n represents the natural frequency of the anti-vibration hammer steel strand; m represents the mass of the anti-vibration hammer steel strand.

[0157] S142. Utilizing the static bending stiffness, damping and excitation frequency of the anti-vibration hammer steel strand when subjected to an impact load, in combination with a dynamic bending stiffness calculation formula, calculate the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0158] Specifically, the calculation formula for dynamic bending stiffness is:

[0159]

[0160] Among them, k d It represents the dynamic bending stiffness of the anti-vibration hammer steel strand, k represents the static bending stiffness of the anti-vibration hammer steel strand; m represents the mass of the anti-vibration hammer steel strand; ω represents the excitation frequency of the anti-vibration hammer steel strand, and the excitation frequency under different impact loads is collected by vibration equipment; c represents the damping of the anti-vibration hammer steel strand, f is the impact force, that is, the impact load on the anti-vibration hammer steel strand; y represents the displacement response of the anti-vibration hammer steel strand when it is subjected to impact load, that is, the displacement of the anti-vibration hammer steel strand close to the hammer head; j refers to the expression of the imaginary part of the dynamic bending stiffness of the anti-vibration hammer steel strand.

[0161] From the calculation formula of dynamic bending stiffness, it can be obtained that dynamic bending stiffness is related to the excitation frequency. Dynamic bending stiffness will change with the excitation frequency, rather than being a fixed value. The calculation formula of dynamic bending stiffness after transformation is:

[0162]

[0163] Among them, k d represents the dynamic bending stiffness of the anti-vibration hammer steel strand, k represents the static bending stiffness of the anti-vibration hammer steel strand, m represents the mass of the anti-vibration hammer steel strand, ω represents the excitation frequency of the anti-vibration hammer steel strand, and c represents the damping of the anti-vibration hammer steel strand. When the excitation frequency is 0, the dynamic bending stiffness is equal to the static bending stiffness, so the static stiffness is a special case of dynamic stiffness.

[0164] It can be obtained from the calculation formula that the value of dynamic bending stiffness is related to the static bending stiffness and excitation frequency of the anti-vibration hammer steel strand, as well as the mass and damping of the anti-vibration hammer steel strand. Therefore, when the dynamic bending stiffness of the anti-vibration hammer is insufficient within a certain frequency band and needs to be optimized, targeted optimization can be carried out by increasing the static bending stiffness, adjusting the mass, increasing the damping, changing the excitation frequency, etc., thereby improving the dynamic bending stiffness.

[0165] In step S2, a dynamic test is performed on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load.

[0166] The second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand under the impact load is obtained by using the method of obtaining the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load in step S1.

[0167] That is, the static bending stiffness of the prestressed anti-vibration hammer steel strand is obtained by using the weight of the weight applied to one end of the prestressed anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand;

[0168] The damping ratio of the prestressed anti-vibration hammer steel strand is obtained by applying an impact load to one end of the prestressed anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration.

[0169] The vibration signal of the anti-vibration hammer steel strand after the impact load is applied is processed by a digital acquisition analyzer to obtain the natural frequency of the anti-vibration hammer steel strand after prestressing.

[0170] The static bending stiffness, damping ratio, natural frequency and excitation frequency of the prestressed anti-vibration hammer steel strand when subjected to impact load are used in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand under the impact load.

[0171] In step S3, based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, the value of the prestress is adjusted to obtain the target stress of the anti-vibration hammer steel strand.

[0172] Specifically, Fig.12As shown, if the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the same impact load is within a preset stiffness ratio range, the value of the prestress is used as the target stress of the anti-vibration hammer steel strand;

[0173] If under the same impact load, the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand is not within the preset stiffness ratio range, the prestress is adjusted and the second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand is recalculated until the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness is within the stiffness ratio range, and the prestress value at this time is used as the target stress of the anti-vibration hammer steel strand.

[0174] The stiffness ratio range in this embodiment is 10%≤λ≤30%, where λ represents the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand. Fig.12 The applied tension is the prestress mentioned in this embodiment, and the prestress value is the target stress.

[0175] After the anti-vibration hammer steel strand is pre-stressed, the anti-vibration hammer steel strand will lose part of the pre-stress due to shrinkage. Therefore, when the anti-vibration hammer steel strand is pre-stressed using a tensioning tool, the target stress can be increased by 2%-5%, thereby reducing the impact of the shrinkage loss of the anti-vibration hammer steel strand.

[0176] The method provided by the present invention can be used to test the dynamic bending stiffness and damping coefficient of the anti-vibration hammer steel strand under impact load, thereby realizing the dynamic characteristic test of the anti-vibration hammer steel strand under large impact load and the selection of prestress for the anti-vibration hammer steel strand.

[0177] Example 3

[0178] Based on the same inventive concept, the present invention also provides a system for determining the prestress of a vibration-damping steel strand, which is used to provide a system for determining the value of the prestress of a prestressed vibration-damping hammer in Example 1, such as Fig.13 As shown, including:

[0179] The first dynamic bending stiffness determination module is used to perform a dynamic test on the vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load;

[0180] The second dynamic bending stiffness determination module is used to perform a dynamic test on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load;

[0181] A target stress determination module is used to adjust the value of the prestress to obtain the target stress of the anti-vibration hammer steel strand based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load;

[0182] Among them, the anti-vibration hammer steel strand is the gap-type steel strand of the anti-vibration hammer in Example 1.

[0183] The target stress determination module is specifically used for:

[0184] If the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the same impact load is within the preset stiffness ratio range, the value of the prestress is taken as the target stress of the anti-vibration hammer steel strand;

[0185] If under the same impact load, the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand is not within the preset stiffness ratio range, the prestress is adjusted and the second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand is recalculated until the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness is within the stiffness ratio range, and the prestress value at this time is used as the target stress of the anti-vibration hammer steel strand.

[0186] The first dynamic bending stiffness determination module is specifically used for:

[0187] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand.

[0188] The damping ratio of the anti-vibration hammer steel strand is obtained by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration;

[0189] The vibration signal of the anti-vibration hammer steel strand after the impact load is applied is processed by a data acquisition analyzer to obtain the natural frequency of the anti-vibration hammer steel strand;

[0190] The static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0191] The first dynamic bending stiffness determination module obtains the static bending stiffness of the anti-vibration hammer steel strand by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand, including:

[0192] The weight of the weight and the deflection of the anti-vibration hammer steel strand at the critical point of yield of the anti-vibration hammer steel strand are obtained by using the strain gauge, which is recorded as the maximum deflection;

[0193] The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight and the maximum deflection combined with the calculation formula of the static bending stiffness.

[0194] The calculation formula of static bending stiffness in the first dynamic bending stiffness determination module is:

[0195]

[0196] Among them, k represents the static bending stiffness of the anti-vibration hammer steel strand; F represents the load on the free end of the anti-vibration hammer steel strand, that is, the weight of the weight connected to the anti-vibration hammer steel strand; l represents the distance from the midpoint of the anti-vibration hammer steel strand to the connection between the anti-vibration hammer steel strand and the hammer head; h max Indicates the maximum deflection.

[0197] The first dynamic bending stiffness determination module obtains the damping ratio of the anti-vibration hammer steel strand by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration, including:

[0198] Apply an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to obtain a vibration attenuation curve of the anti-vibration hammer steel strand generated by attenuated vibration;

[0199] According to the amplitude values ​​of two different vibration periods in the vibration attenuation curve and the calculation formula of the damping ratio, the damping ratio of the anti-vibration hammer steel strand is obtained.

[0200] The calculation formula of the damping ratio in the first dynamic bending stiffness determination module is:

[0201]

[0202] Where, ζ represents the damping ratio of the anti-vibration hammer steel strand; b represents the interval period value between two vibration cycles; a represents the ath vibration cycle; u a It represents the amplitude value of the ath vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand; u a+b It represents the amplitude value of the a+bth vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand.

[0203] The first dynamic bending stiffness determination module uses the static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand when subjected to impact load, combined with the dynamic bending stiffness calculation formula of the anti-vibration hammer steel strand, to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, including:

[0204] The damping of the anti-vibration hammer steel strand is calculated by using the mass, damping ratio and natural frequency of the anti-vibration hammer steel strand and combining the damping calculation formula.

[0205] The static bending stiffness, damping and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the dynamic bending stiffness calculation formula to calculate the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

[0206] The calculation formula of the dynamic bending stiffness in the first dynamic bending stiffness determination module is:

[0207]

[0208] Among them, k drepresents the dynamic bending stiffness of the anti-vibration hammer steel strand, k represents the static bending stiffness of the anti-vibration hammer steel strand; m represents the mass of the anti-vibration hammer steel strand; ω represents the excitation frequency of the anti-vibration hammer steel strand; c represents the damping of the anti-vibration hammer steel strand.

[0209] Embodiment 4:

[0210] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a method for determining the prestressing of a vibration-proof hammer steel strand in the above embodiment.

[0211] Embodiment 5:

[0212] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a method for determining the prestressing of an anti-vibration hammer steel strand in the above embodiment.

[0213] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0214] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0215] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0216] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0217] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A prestressed anti-vibration hammer, characterized in that: include: Gap-type steel strand (1), an assembled integral hammer head (3) and an anchoring fixture; The gap-shaped steel strand (1) comprises, from the inside to the outside, a center layer round wire (13), a middle layer shaped wire (12) and an outer layer round wire (11); a gap (14) is arranged between the center layer round wire (13) and the middle layer shaped wire (12), and the gap (14) is filled with grease; and the lengths of the middle layer shaped wire (12) and the outer layer round wire (11) are shorter than those of the center layer round wire (13); and the middle layer shaped wire (12) is an arch structure; The two ends of the central layer round wire (13) are respectively connected to an assembled integral hammer head (3), and the middle position of each assembled integral hammer head (3) away from one end of the central layer round wire (13) is a hollow part, and the anchoring clamp is assembled in the hollow part; The anchoring clamp is used to clamp the center layer round wire (13) after the target stress is pre-applied by an external tensioning tool; the gap-shaped steel strand (1) and the assembled integral hammer head (3) are coupled and connected through the center layer round wire (13) after the target stress is pre-applied.

2. A prestressed anti-vibration hammer according to claim 1, characterized in that: The end of the assembled integral hammer head (3) close to the center layer circular line (13) is provided with a center hole; The two ends of the center layer round wire (13) respectively pass through the center holes of the assembled integral hammer heads (3) at one end thereof, and the anchoring fixture is clamped on the center layer round wire (13) that has passed through the center hole and has been pre-stressed with a target stress; The gap-shaped steel strand (1) is coupled and connected with an assembled integral hammer head (3) with an anchoring clamp provided therein, through a center layer round wire (13) passing through a center hole and clamped by an anchoring clamp.

3. A prestressed anti-vibration hammer as claimed in claim 2, characterized in that: The anti-vibration hammer also includes a wire clamp (2), one end of which is clamped in the middle of the outer round wire (11) and the other end is sleeved on the external conductor; the assembled integral hammer head (3) is symmetrically distributed on both sides of the wire clamp (2).

4. A prestressed anti-vibration hammer as claimed in claim 3, characterized in that: The assembled integral hammer head (3) comprises a concave hammer head (23) and a convex hammer head (31), wherein the concave hammer head (23) is concave inwardly at one end facing away from the line clamp (2) and is closely attached to the convex hammer head (31) and protrudes outwardly; the convex hammer head (31) is open and hollow at one end facing away from the concave hammer head (23), and the opening direction faces away from the concave hammer head (23), and the anchoring fixture is assembled in the hollow part of the convex hammer head (31); The center hole comprises a first center hole (22) opened in the concave hammer head and a second center hole (33) opened in the convex hammer head (31); the center layer circular wire (13) passes through the first center hole (22) and the second center hole (33) in sequence.

5. A prestressed anti-vibration hammer as claimed in claim 4, characterized in that: The diameters of the first center hole (22) and the second center hole (33) are smaller than the diameter of the gap-shaped steel strand (1) and larger than the diameter of the center layer round wire (13).

6. A prestressed anti-vibration hammer as claimed in claim 4, characterized in that: The concave hammer head (23) has a U-shaped structure at one end close to the wire clamp (2), the opening of the U-shaped structure faces the wire clamp, a steel sleeve (21) is fixedly installed in the concave part of the opening of the U-shaped structure, and the steel sleeve (21) is sleeved on the outside of the outer round wire (11).

7. A prestressed anti-vibration hammer according to claim 4, characterized in that: An anchoring clamp embedding groove (32) is respectively arranged at the upper and lower edges of the hollow part of the convex hammer head (31), the anchoring clamp embedding groove (32) is closely attached to the second center hole (33), and the anchoring clamp is assembled in the anchoring clamp embedding groove (32).

8. A prestressed anti-vibration hammer according to claim 7, characterized in that: The anchoring clamp comprises an upper clamp (41) and a lower clamp (42), both of which are wedge-shaped structures. The upper clamp (41) is clamped with an anchoring clamp embedding groove (32) arranged at the upper edge, and the lower clamp (42) is clamped with an anchoring clamp embedding groove (32) arranged at the lower edge. After clamping, the wedge-shaped structures of the upper clamp (41) and the lower clamp (42) are opposite to each other at the side, and the center layer circular wire (13) is clamped between the upper clamp (41) and the lower clamp (42).

9. A prestressed anti-vibration hammer according to claim 1, characterized in that: The intermediate layer profile (12) comprises: A plurality of profiled wires, the cross section of which is a quadrilateral that is wide at the top and narrow at the bottom, are twisted and extruded in the same direction around a central layer round wire (13) to form an arch structure.

10. A method for determining the prestress of a vibration-proof hammer steel strand, characterized in that: include: Performing a dynamic test on a vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load; Performing a dynamic test on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load; Based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load, the value of the prestress is adjusted to obtain the target stress of the anti-vibration hammer steel strand; Wherein, the anti-vibration hammer steel strand is the gap-type steel strand of the anti-vibration hammer as described in claim 1.

11. A method for determining prestress of a vibration-proof hammer steel strand as claimed in claim 10, characterized in that: The method of adjusting the value of the prestress based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load to obtain the target stress of the anti-vibration hammer steel strand comprises: If the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the same impact load is within the preset stiffness ratio range, the value of the prestress is taken as the target stress of the anti-vibration hammer steel strand; If under the same impact load, the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand is not within the preset stiffness ratio range, the prestress is adjusted and the second dynamic bending stiffness of the prestressed anti-vibration hammer steel strand is recalculated until the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness is within the stiffness ratio range, and the prestress value at this time is used as the target stress of the anti-vibration hammer steel strand.

12. A method for determining prestress of a vibration-proof hammer steel strand as claimed in claim 10, characterized in that: The method of performing a dynamic test on the vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load includes: The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand. The damping ratio of the anti-vibration hammer steel strand is obtained by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration; The vibration signal of the anti-vibration hammer steel strand after the impact load is applied is processed by a data acquisition analyzer to obtain the natural frequency of the anti-vibration hammer steel strand; The static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

13. A method for determining the prestress of a vibration-proof hammer steel strand according to claim 12, characterized in that: The method of obtaining the static bending stiffness of the anti-vibration hammer steel strand by using the weight of the weight applied to one end of the anti-vibration hammer steel strand and the deflection of the anti-vibration hammer steel strand comprises: The weight of the weight and the deflection of the anti-vibration hammer steel strand at the critical point of yield of the anti-vibration hammer steel strand are obtained by using the strain gauge, which is recorded as the maximum deflection; The static bending stiffness of the anti-vibration hammer steel strand is obtained by using the weight of the weight and the maximum deflection combined with the calculation formula of the static bending stiffness.

14. A method for determining the prestress of a vibration-proof hammer steel strand according to claim 13, characterized in that: The calculation formula of the static bending stiffness is: Among them, k represents the static bending stiffness of the anti-vibration hammer steel strand; F represents the load on the free end of the anti-vibration hammer steel strand, that is, the weight of the weight connected to the anti-vibration hammer steel strand; l represents the distance from the midpoint of the anti-vibration hammer steel strand to the connection between the anti-vibration hammer steel strand and the hammer head; h max Indicates the maximum deflection.

15. A method for determining the prestress of a vibration-proof hammer steel strand as claimed in claim 12, characterized in that: The damping ratio of the anti-vibration hammer steel strand is obtained by applying an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to generate attenuated vibration, including: Apply an impact load to one end of the anti-vibration hammer steel strand connected to the hammer head to obtain a vibration attenuation curve of the anti-vibration hammer steel strand generated by attenuated vibration; According to the amplitude values ​​of two different vibration periods in the vibration attenuation curve and the calculation formula of the damping ratio, the damping ratio of the anti-vibration hammer steel strand is obtained.

16. A method for determining prestress of a vibration-proof hammer steel strand as claimed in claim 15, characterized in that: The damping ratio is calculated as: Where, ζ represents the damping ratio of the anti-vibration hammer steel strand; b represents the interval period value between two vibration cycles; a represents the ath vibration cycle; u a It represents the amplitude value of the ath vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand; u a+b It represents the amplitude value of the a+bth vibration cycle in the vibration attenuation curve of the anti-vibration hammer steel strand.

17. A method for determining prestress of a vibration-proof hammer steel strand as claimed in claim 12, characterized in that: The static bending stiffness, damping ratio, natural frequency and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the calculation formula of the dynamic bending stiffness of the anti-vibration hammer steel strand to obtain the first dynamic bending stiffness of the anti-vibration hammer steel strand under impact load, including: The damping of the anti-vibration hammer steel strand is calculated by using the mass, damping ratio and natural frequency of the anti-vibration hammer steel strand and combining the damping calculation formula. The static bending stiffness, damping and excitation frequency of the anti-vibration hammer steel strand under impact load are used in combination with the dynamic bending stiffness calculation formula to calculate the first dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load.

18. A method for determining prestressing of a vibration-proof hammer steel strand according to claim 17, characterized in that: The dynamic bending stiffness calculation formula is: Among them, k d represents the dynamic bending stiffness of the anti-vibration hammer steel strand, k represents the static bending stiffness of the anti-vibration hammer steel strand; m represents the mass of the anti-vibration hammer steel strand; ω represents the excitation frequency of the anti-vibration hammer steel strand; c represents the damping of the anti-vibration hammer steel strand.

19. A system for determining prestress of a vibration-proof hammer steel strand, characterized in that: include: The first dynamic bending stiffness determination module is used to perform a dynamic test on the vibration-proof hammer steel strand without prestressing to obtain the first dynamic bending stiffness of the vibration-proof hammer steel strand under impact load; The second dynamic bending stiffness determination module is used to perform a dynamic test on the prestressed anti-vibration hammer steel strand to obtain the second dynamic bending stiffness of the anti-vibration hammer steel strand under impact load; A target stress determination module is used to adjust the value of the prestress to obtain the target stress of the anti-vibration hammer steel strand based on the ratio of the first dynamic bending stiffness to the second dynamic bending stiffness of the anti-vibration hammer steel strand under the impact load; Wherein, the anti-vibration hammer steel strand is the gap-type steel strand of the anti-vibration hammer as described in claim 1.

20. A computer device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, a method for determining the prestressing of a vibration-damping steel strand as claimed in any one of claims 10 to 18 is implemented.

21. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, a method for determining the prestressing of a vibration-proof hammer steel strand as described in any one of claims 10 to 18 is implemented.

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