CN-122000819-A - Cable protection device and method for wave velocity instrument

CN122000819ACN 122000819 ACN122000819 ACN 122000819ACN-122000819-A

Abstract

The invention discloses a wave speed instrument cable protection device and method, which belong to the technical field of engineering investigation and detection and comprise a protection triangular cone which is of a circumferential split buckling structure, wherein the protection triangular cone comprises at least two clacks, the clacks are buckled to form a conical protection main body, an abutting surface between the adjacent clacks is provided with an mutually embedded alignment limiting structure, the inner side of each clack is provided with an arc groove, when the clacks are in a buckled state, each arc groove surrounds to form a composite arc groove penetrating along the axial direction of the conical protection main body, a steel wire rope is in parallel fit with a wave speed instrument cable to be protected, the steel wire rope and the wave speed instrument cable to be protected are jointly embedded in the composite arc groove, the corresponding positions of the adjacent clacks are respectively provided with a half screw rod section, when the clacks are in the buckled state, the same side half screw rod sections of the adjacent clacks are abutted to form a locking screw rod, the locking assembly comprises a locking nut which is in threaded fit with the locking screw rod, and an elastic buffer ring is arranged at the bottom edge of the protection triangular cone.

Inventors

Zhou Bixiao
SHAN BO
LI DANGMIN
FAN JIE
LIN JIANCHAO
WANG LIHUI
LI ZHENYANG

Assignees

中国电力工程顾问集团西北电力设计院有限公司

Dates

Publication Date: 20260508
Application Date: 20260326

Claims (10)

1. The cable protection device for the wave velocity instrument is characterized by comprising a protection triangular cone, a steel wire rope, a locking assembly and an elastic buffer ring; The protection triangular cone is of a circumferential split buckling structure and comprises at least two clacks, wherein each clack is buckled to form a conical protection main body; the inner side of each petal body is provided with an arc-shaped groove, and when the petal bodies are in a buckling state, the arc-shaped grooves are surrounded to form a composite arc-shaped groove which penetrates along the axial direction of the conical protection main body; The steel wire rope and the wave speed instrument cable to be protected are arranged in parallel in a fitting mode, and are embedded in the composite arc-shaped groove together; the corresponding positions of the adjacent clacks are respectively provided with a half screw section, and when each clack is in a buckling state, the half screw sections on the same side of the adjacent clacks are butted to form a locking screw; The locking assembly comprises locknuts which are in threaded fit with the locking screw rods to lock the valve bodies; The elastic buffer ring is arranged at the bottom edge of the protection triangular cone.
2. The wave speed instrument cable protection device according to claim 1, wherein two valve bodies are arranged, and the two valve bodies are of half cone structures with the same structure.
3. The wave speed instrument cable protector according to claim 1, wherein three or more valve bodies are provided, and each valve body is equally arranged along the circumferential direction of the cone-shaped protector body.
4. The wave speed instrument cable protection device according to claim 1, wherein the protection triangular cone is of a single cone structure.
5. The wave speed instrument cable protector of claim 1, wherein the alignment limiting structure comprises at least one pair of alignment bosses extending axially and alignment grooves corresponding to the alignment bosses one by one and having a shape adapted to that of the alignment bosses; the alignment boss is integrally formed on the joint surface of one of the two adjacent valve bodies, the alignment groove is formed on the joint surface of the other valve body of the two adjacent valve bodies, and the alignment boss is embedded in the alignment groove to form a radial torsion-resistant limiting structure.
6. The wave speed instrument cable protection device according to claim 1, wherein the composite arc-shaped groove is a double arc-shaped clamping groove, and a frosted anti-slip surface is arranged on the inner wall of the composite arc-shaped groove.
7. The wave speed instrument cable protection device according to claim 1, wherein the top and the bottom of each petal are respectively provided with the half screw rod sections, and when the petals are buckled, the half screw rod sections on the same side of the adjacent petals are butted to form two groups of locking screw rods which are coaxially arranged at the top and the bottom; and an arc transition structure is arranged at the joint of the locking screw and the petal body.
8. The wave speed instrument cable protection device according to claim 1, wherein the locking screw is a glass fiber reinforced plastic screw, and the locknut is a nylon insert locknut; The valve body is made of glass fiber reinforced plastic; the elastic buffer ring is an annular ring body made of polyurethane, the inner diameter of the elastic buffer ring is the same as the outer diameter of the bottom edge of the protection triangular cone, and the elastic buffer ring is bonded with the bottom edge of the protection triangular cone.
9. The wave speed instrument cable protection device according to claim 1, wherein the steel wire rope is a hot dip galvanized steel core steel wire rope; one end of the steel wire rope extends to the top end surface of the protection triangular cone and is locked by the locknut synchronously with the locking screw; The other end of the steel wire rope extends to the joint of the wave speed instrument cable to be protected and the test probe and is fixed by crimping through a crimping pipe, and the length of the steel wire rope is greater than that of the wave speed instrument cable to be protected.
10. A wave speed instrument cable protection method, characterized in that a wave speed instrument cable protection device according to any one of claims 1-9 is used, comprising the steps of: Presetting an elastic buffer ring at the corresponding position of the bottom edge of each petal body of the protection triangular cone; attaching the steel wire rope and the wave speed instrument cable to be protected in parallel along the axial direction to form a cable assembly; Each petal body is circumferentially enclosed on the outer side of the cable assembly body, alignment embedding is completed through an alignment limiting structure of the adjacent petal body, so that each petal body is buckled to form a conical protection main body, butt joint of the locking screw rod and surrounding of the composite arc-shaped groove are synchronously completed, and the cable assembly body is embedded in the composite arc-shaped groove; The locknut is in threaded fit with the locking screw rod which is in butt joint, and each petal body is locked and fixed, so that the conical protection main body is fastened on the periphery of the cable assembly body in a clasping manner, and the protection device is assembled; And (3) lowering the assembled protective device to a target drilling hole along with the wave speed instrument cable, and lifting and recovering after the wave speed test operation is completed.

Description

Cable protection device and method for wave velocity instrument Technical Field The invention belongs to the technical field of engineering investigation and detection, and particularly relates to a cable protection device and method for a wave velocity instrument. Background The wave velocity test is a key technology for acquiring stratum elastic wave propagation velocity in the field of engineering geological investigation, and a vibration source and a test probe are lowered to a designated depth in a drill hole, test signals are transmitted by using a wave velocity instrument cable connecting the probe and a ground host, so that stratum mechanical properties and distribution characteristics are analyzed, and core geological parameters are provided for engineering design and construction. In actual wave speed test operation, drilling environment is complicated changeable, and the general loose stratum such as clay, sand, gravel, and the borehole inner wall easily produces the soil block and drops, stone phenomenon that drops, and the probe easily rubs with the pore wall in the vertical pulling in-process with the excitation source simultaneously, leads to wave speed instrument cable to face multiple damage risk, and specific problem is as follows: 1. The cable is blocked and pulled, namely soil blocks and stones falling in the drilling holes are easily accumulated above the probe to form a blocking area, the cable is required to bear additional pulling resistance when the probe is pulled, if the resistance is overlarge, the cable is easily stretched and deformed, a core wire is broken, or the joint of the cable and the probe is fallen off, the test operation is directly interrupted, and equipment damage and test data loss are caused. 2. The cable is worn and scratched, the inner wall of the drill hole is provided with sharp gravel and rock scraps, the cable is continuously rubbed and scratched with the hole wall and the falling stone in the process of being lowered and lifted along with the probe, the cable sheath is easy to damage, the internal core wire is exposed, the stability of signal transmission is affected, instrument faults can be caused by core wire short circuit, meanwhile, the damaged cable cannot resist corrosion of underground water in the drill hole, and the service life is further shortened. 3. The existing protection measures are insufficient, the protection of the wave speed instrument cable in the current engineering is mainly achieved by adopting temporary measures such as simple binding of a protective sleeve, winding of an insulating adhesive tape and the like, the protection strength of the mode is low, stone impact and continuous friction cannot be effectively resisted, the fixing reliability of the protective sleeve and the cable is poor, the protective sleeve is easy to loosen and shift in a drilled hole, continuous effective protection cannot be formed, the problem that the installation and the disassembly are inconvenient and flexible adaptation cannot be achieved according to the specification of the cable exists due to the fact that the integral protection structure is partially adopted, the protection structure is easy to clamp in a soil block and stone block dropping area, and the risk of pulling damage of the cable is increased. 4. The testing efficiency and the cost are high, the cable is required to be stopped for replacing or maintaining equipment after being damaged, the testing progress is seriously influenced, the construction period is prolonged, meanwhile, the cable of the wave speed instrument is a special testing cable, the purchasing and maintaining cost is high, and the engineering investigation cost is greatly increased due to frequent damage. In summary, to the technical defects of poor protection effect, unreliable fixation, inconvenient installation, easy aggravation of blocking risks and the like of the cable protection measures in the existing wave speed test, a wave speed instrument cable reinforcement device which can effectively resist stone impact and friction in a borehole, realize stable fixation of the cable, is convenient to install and detach and adapt to different borehole working conditions is developed, and the wave speed instrument cable reinforcement device becomes a technical problem to be solved urgently in the field of current wave speed test engineering. Disclosure of Invention The invention aims to solve the problems of poor protection effect, unreliable fixation, easy rotation and dislocation around a cable and inconvenient installation of the cable protection measures of the wave speed instrument in the existing wave speed test, and provides a wave speed instrument cable protection device and a wave speed instrument cable protection method. In order to achieve the above purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a cable protection device for a wave velocity instrument, whic