CN113266007A - Prestressed anchor cable with fracture early warning function - Google Patents
Prestressed anchor cable with fracture early warning function Download PDFInfo
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- CN113266007A CN113266007A CN202110578339.XA CN202110578339A CN113266007A CN 113266007 A CN113266007 A CN 113266007A CN 202110578339 A CN202110578339 A CN 202110578339A CN 113266007 A CN113266007 A CN 113266007A
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- early warning
- steel strand
- anchor cable
- steel
- anchoring
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/02—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection having means for indicating tension
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The invention discloses a pre-stressed anchor cable with a fracture early warning function, which consists of a steel strand for anchoring, a steel strand for early warning and an early warning device. The early warning device consists of a pre-stretching spring which is arranged in the anchor cable hole and is clamped and fixed with the early warning steel stranded wire and a sliding rod which penetrates through the anchorage device. The tensile strength of the steel strand for early warning is lower than that of the steel strand for anchoring according to a certain proportion, or the applied pre-stretching stress is higher than that of the steel strand for anchoring according to a certain proportion. The synchronous stretching deformation of various steel strands is generated in the working process of the anchor cable. Because the steel strand for early warning will reach tensile strength and fracture earlier than the steel strand for anchoring, trigger early warning device's spring shrink, lead to the slide bar to pop out to the hole to realize the early warning to the anchor rope whole approaching extreme condition. The anchor cable is suitable for reinforcing various rock masses and can provide timely early warning for anchor cable fracture under the condition of large deformation of the rock masses.
Description
Technical Field
The invention relates to a prestressed anchor cable, in particular to a prestressed anchor cable with a fracture early warning function, which is applied to the prestressed anchor cable support reinforcement engineering of rock engineering, such as anchor cable support construction of large rock slopes and tunnel chamber rock walls.
Background
The prestressed anchor cable is a support structure widely applied to rock slopes and tunnel engineering. The rock mass can be kept stable by drilling holes in the rock mass, installing anchor cables and applying pre-stretching stress. The anchor cable is usually composed of a plurality of steel strands, and a certain amount of pre-stretching stress is applied after installation; along with the deformation of the rock mass, the tensile stress in the anchor cable is gradually increased until the anchoring force is lost or the anchor cable is broken. The anchor cable is suddenly broken, so that the rock mass supporting force is rapidly reduced and even completely lost; the sudden fracture of the rock-soil anchor cable is easy to induce chain reaction, and becomes a serious accident such as rock mass collapse and instability.
Therefore, great geotechnical engineering often needs to monitor the stress and deformation (strain) of the anchor cable to judge the safety state of the anchor cable and perform prevention and control or alarm on the possible fracture risk of the anchor cable. However, this kind of monitoring method needs a special sensor and a secondary instrument, and the monitoring system is complex and high in cost, and is difficult to be developed on a large scale for all the anchor cables.
The invention patent document of China "a mine anchor cable assembly breakage early warning device (application number 201820576035.3)", on one hand, is based on special instruments such as a sensor and a secondary instrument, and triggers an alarm by utilizing the characteristic that the pressure value exceeds the set value of a pressure gauge of an electrical node when an anchor cable is broken; on the other hand, the alarm can be given only after the anchor cable is broken, but not early warning is given, and the emergency rescue time cannot be reserved for engineering technicians. Generally, the technology is complex, the cost is high, and early warning cannot be implemented.
In view of the above, the invention provides a prestressed anchor cable with a fracture early warning function and a use method thereof, and the early warning is carried out on the condition that the prestressed anchor cable is stressed, deformed and approaches to the fracture state by using a simpler and more practical method.
Technical content
The invention aims to overcome the defects in the prior art, provides a prestressed anchor cable with a fracture early warning function, and is suitable for the prestressed anchor cable support reinforcement engineering of rock engineering. The steel strand for early warning meeting certain technical conditions is creatively added into the common anchor cable, and the characteristics that the steel strand for anchoring achieves tensile strength and is broken first are utilized to induce the early warning device to give an alarm, so that the early warning of the impending breakage of the anchor cable is realized, and time is gained for carrying out engineering rescue or reinforcement.
The invention provides a technical scheme for realizing the purpose that a prestressed anchor cable with a fracture early warning function comprises a plurality of steel stranded wires (2) for anchoring and an anchorage device (3), and is characterized in that: the early warning device is provided with one or more steel stranded wires (1) for early warning and early warning devices (4) with the number equal to that of the steel stranded wires for early warning. The assembly relation of the using states of the components is as follows:
one end of the steel strand for early warning and one end of the steel strand for anchoring in the drill hole are anchored in the rock, and the other ends of the drill hole are fixed by an anchorage device and apply pre-stretching stress; the early warning steel strand and the anchoring steel strand are arranged parallel to each other in the borehole, the former having a lower tensile strength or being subjected to a higher pre-tensile stress than the latter. That is, in the case where the same pre-stretching stress is applied, the tensile strength of the early warning steel strand is lower than that of the anchoring steel strand; and when the tensile strength of the steel strand for early warning is the same as that of the steel strand for anchoring, the pre-stretching stress applied to the steel strand for early warning is greater than that applied to the steel strand for anchoring.
The steel strand for early warning and the steel strand for anchoring are uniformly arranged in the drill hole.
The early warning device (4) consists of a sliding rod (5), a spring (6), an early warning lever (7) and a guide pipe (8). The guide pipe (8) penetrates through the anchorage device (3) and is fixed with the anchorage device; the middle fulcrum of the early warning lever (7) is fixed on the inner wall of the drilled hole; the springs (6) are sleeved on the sliding rod (5) and penetrate through the guide pipes (8); the tail ends of the sliding rod (5) and the spring (6) in the drilled hole are fixed at one end of the early warning lever (7), and the other end of the early warning lever (7) is fixed on the early warning steel strand (1); after the spring (6) is installed, the spring is initially stretched, and the exposed end of the spring is fixed at the exposed end (the end exposed out of the anchor) of the guide pipe (8); the exposed end of the sliding rod (5) is in a free state.
The one end of early warning device (4) that exposes outside the ground tackle, the accessible installs the safety cover or adopts other modes, prevents that exposed element from receiving external force striking damage to prevent foreign matters such as earth from invading the space in stand pipe (8), avoid influencing popping out of slide bar (5).
In the early warning device (4), the length of the inner hole of the guide pipe (8) is preferably 10-20 cm; the length of the spring (6) in a non-stretching state is not less than the total length of the guide tube (8); after the sliding rod (5) is installed, the length of the exposed section is more than or equal to 5 cm.
The sliding rod (5) is preferably made of light corrosion-resistant materials, such as an aluminum rod and a nylon rod; the spring (6) can be made of steel; the guide tube (8) is preferably made of corrosion-resistant non-metallic or metallic materials, such as glass fiber tubes, aluminum tubes, stainless steel tubes, and the like. The protective cover at the exposed end of the guide tube (8) is preferably a transparent organic glass cover.
When the anchor cable based on the structural characteristics is arranged in a rock mass borehole to play a role in reinforcement, the two types of steel strands generate equal tensile deformation; along with the gradual increase of the tensile deformation of the anchor cable, the steel strand (1) for early warning reaches tensile strength and breaks before the steel strand (2) for anchoring, triggers the spring (6) fixed together with the steel strand to contract, causes the sliding rod (5) to pop out of the hole, and realizes the early warning that the anchor cable is about to break.
According to the anchor cable, the steel wire materials and specifications of the steel stranded wires (1) for early warning can be the same or different; and the material and the specification of the steel wire can be the same as or different from those of the steel wire of the steel strand (2) for anchoring. When the anchor cable contains a plurality of steel strands (1) for early warning, the steel strands for early warning can be broken synchronously and also can be broken in sequence once the anchored rock mass is deformed excessively, so that more reliable early warning or multiple early warning is realized for the breakage of the anchor cable.
The steel strand (1) for early warning must meet one of the following technical conditions to ensure that the steel strand always breaks before the steel strand for anchoring reaches the tensile strength: firstly, the pretension stress of each steel strand (1) for early warning can be the same or different, but the pretension stress is higher than that of the steel strand (2) for anchoring according to a certain proportion; secondly, the tensile strength of each early warning steel strand (1) can be the same or different, but the tensile strength is lower than that of the anchoring steel strand (2) according to a certain proportion. The certain proportion can be determined according to the pre-stretching stress design value and the tensile strength limit value of the steel strand for anchoring and the advance degree of fracture early warning; the former is generally not less than 1.5-2.0, and the latter is preferably 0.80-0.95.
The number of steel wires contained in the steel strand (1) for early warning is as small as possible, and the ultimate tensile capacity of the steel strand (1) for early warning is not more than 5% -10% of the total ultimate tensile capacity of all the steel strands (2) for anchoring, so that the influence of the steel strand (1) for early warning on the overall tensile capacity of the anchor cable is reduced; the tensile capacity of the early warning steel strand (1) can be counted or not counted into the overall tensile capacity of the anchor cable.
The method for installing the steel strand and applying the prestress of the anchor cable is basically the same as that of the conventional prestress anchor cable, and the deep section and the shallow section along the axial direction of the drill hole are respectively an anchoring section and a free section.
The installation and prestress application of the anchor cable are different from the conventional prestress anchor cable in that:
firstly, before the orifice anchor (3) is installed, the parts in the hole of the early warning device (4), namely the sliding rod (5) and the spring (6), are fixed on the early warning steel strand (1) by utilizing the early warning lever (7), the guide pipe (8) is installed and fixed on the anchor (3), and then the sliding rod (5) and the spring (6) penetrate out of the guide pipe (8), so that the orifice anchor is installed.
Secondly, when pre-stretching stress is applied to the anchor cable, firstly, pre-stretching stress with equal numerical value is applied to the steel stranded wires (2) for anchoring together or in batches; and then respectively applying the designed pre-stretching stress to each pre-warning steel strand (1).
Thirdly, after the prestress of each steel strand (1) for early warning is applied, the exposed ends of the springs (5) are pulled one by one and fixed on the guide pipe (8) by using the pins (9), so that the springs are all in an initial stretching state.
Fourthly, after the anchor cable is installed, the exposed part of the early warning device (4) can be protected by adopting a protective cover or other measures.
After the anchor cable is adopted to reinforce a rock body, the early warning steel stranded wires and the anchoring steel stranded wires in the anchor cable are subjected to synchronous and equivalent tensile deformation, so that the tensile stress is increased. The characteristic that the steel strand for early warning is broken before the steel strand for anchoring is utilized, the whole stress of the anchor cable approaches the limit state, the anchor cable is about to be broken, and a breakage early warning signal is sent out, so that a key basis is provided for timely judging the safety condition of rock mass anchoring and organizing emergency repair reinforcement.
Drawings
FIG. 1 is an axial vertical cross-section of a pre-stressed anchor cable (including a single pre-warning steel strand) with a fracture pre-warning function according to one embodiment.
FIG. 2 is a left side view (i.e., an anchor end elevation view) of embodiment 1.
Fig. 3 is a cross-sectional view i-i of the anchor cable of example 1.
Fig. 4 is a partially enlarged view (a) of the anchor cable according to example 1.
Fig. 5 is a cross-sectional view ii-ii of anchor cable section a of example 1.
Fig. 6 is a partially enlarged view (B) of the anchor cable according to example 1.
Fig. 7 is a iii-iii cross-sectional view of anchor cable section B of example 1.
Fig. 8 is an axial vertical sectional view of a prestressed anchorage cable (including a plurality of strands for early warning, 2 strands) having a fracture early warning function according to example 2.
FIG. 9 is a left side view (i.e., anchor end elevation) of example 2.
Fig. 10 is a cross-sectional view of the anchor cable of example 2, taken from iv to iv.
Detailed Description
Embodiments of the invention are described in detail below with reference to the accompanying drawings of various embodiments:
example 1: the pre-stressed anchor cable (comprising a single steel strand for early warning) with the fracture early warning function.
As shown in fig. 1, 2 and 3, the anchor cable is composed of a bundle of early warning steel strands 1, three bundles of anchoring steel strands 2, an anchorage device 3 and an early warning device 4. The early warning device 4 consists of a sliding rod 5, a spring 6, an early warning lever 7, a guide pipe 8 and a pin 9.
The anchor cable assembly structure of the invention:
the early warning steel strand 1 and the three anchoring steel strands 2 are characterized in that one end in a drill hole is anchored in a rock, and the other end outside the drill hole is fixed by an anchorage device and applies pre-stretching stress; the early warning steel strand 1 and the anchoring steel strand 2 are arranged parallel to each other in the borehole, the former having a lower tensile strength or being subjected to a higher pre-tension than the latter. That is, in the case where the same pre-stretching stress is applied, the tensile strength of the early warning steel strand is lower than that of the anchoring steel strand; and when the tensile strength of the steel strand for early warning is the same as that of the steel strand for anchoring, the pre-stretching stress applied to the steel strand for early warning is greater than that applied to the steel strand for anchoring.
The steel strand for early warning 1 and the steel strand for anchoring 2 are uniformly arranged in the borehole. The three steel strands 2 for anchoring are distributed on the section of the drilled hole in an equilateral triangle shape, and the steel strand 1 for early warning is positioned in the center of the equilateral triangle.
The early warning device 4 consists of a sliding rod 5, a spring 6, an early warning lever 7 and a guide pipe 8. The guide pipe 8 penetrates through the anchorage device 3 and is fixed with the anchorage device, and the length of the inside of the hole of the guide pipe 8 is preferably 10-20 cm; the middle fulcrum of the early warning lever 7 is fixed on the inner wall of the drill hole; the length of the spring 6 in a non-stretching state is not less than the total length of the guide tube 8, and the spring 6 is sleeved on the sliding rod 5 and penetrates through the guide tube 8; the tail ends of the sliding rod 5 and the spring 6 in the drill hole are fixed at one end of the early warning lever 7, and the other end of the early warning lever 7 is fixed on the early warning steel strand 1; after the spring 6 is installed, the spring is initially stretched, and the exposed end of the spring is fixed at the exposed end (the end exposed out of the anchor device) of the guide pipe 8; the exposed end of the slide bar 5 is in a free state. The exposed length of the sliding rod 5 after installation is more than or equal to 5 cm.
The one end of early warning device that exposes outside the ground tackle covers with the safety cover, prevents that exposed component from receiving external force striking to damage to prevent foreign matters such as earth from invading the space in the stand pipe 8, avoid influencing popping out of slide bar 5, the safety cover adopts transparent organic glass cover. The sliding rod 5 is made of light corrosion-resistant materials, such as an aluminum rod and a nylon rod; the spring 6 is made of steel; the guide tube 8 is made of corrosion-resistant non-metal or metal materials, such as glass fiber tubes, aluminum tubes, stainless steel tubes and the like.
The installation and construction method comprises the following steps:
(1) firstly, constructing an anchor cable hole in a rock mass, cleaning the hole wall and removing rock slag;
(2) according to the depth of an anchor cable hole, prefabricating an early warning steel strand 1 and an anchoring steel strand 2 with proper lengths, and bundling the steel strands into a bundle at certain intervals to form an anchor cable consisting of two or more steel strands;
(3) at the position where the steel strand for early warning 1 is close to the orifice for a certain distance, the core components of the early warning device 4, namely a sliding rod 5 and a spring 6, are fixed on the steel strand for early warning 1 by utilizing an early warning lever 7, so that firm connection is ensured;
(4) installing the anchor cable into the drilled hole by using a drilling tool for forming the hole according to the construction process of the conventional anchor cable, and anchoring the deep section; a non-anchoring section (free section) of the anchor cable can be provided with a sleeve pipe according to the requirement for subsequent annular grouting;
(5) an anchorage device 3 with a plurality of through holes is arranged at the hole opening; respectively penetrating the steel strand 1 for early warning and the steel strand 2 for anchoring out of through holes on the anchorage device, and penetrating the sliding rod 5 and the spring 6 out of a guide pipe 8 pre-arranged on the anchorage device 3 (the guide pipe 8 is arranged in a through hole at a proper position on the anchorage device 3 and is bonded by strong glue, and a proper length is reserved in the hole);
(6) the outer end of the spring 6 is pulled to be in a stretching state with a certain length; then cutting off the redundant part, and fixing the outer end of the cut-off spring on a guide pipe 8 by using a pin 9;
(7) pre-stretching stress is applied to the multiple steel strands 2 for anchoring according to the same batch or different batches; ensuring that the same tensile stress state is achieved;
(8) and (3) applying pre-stretching stress to the steel strand 1 for early warning to a design value.
(9) And arranging a protective cover or adopting other methods to protect the exposed ends of the steel strand 1 for early warning and the early warning device 4.
Example 2: the pre-stressed anchor cable (2 steel strands for early warning) with the fracture early warning function.
The structure of this type of anchor cable is basically the same as embodiment 1, and the difference mainly lies in:
in the embodiment 2, two steel strands for early warning 1 and 5 steel strands for anchoring 2 are included, and each steel strand for early warning is provided with a corresponding early warning device 4; the 5 bundles of anchoring steel strands 2 are arranged in a regular pentagon shape on the section of the drilled hole. Each pre-warning steel strand 1 can apply pre-stretching stress with equal or unequal values which are larger than those of the anchoring steel strand 2, or has equal or unequal values which are smaller than those of the anchoring steel strand 2.
The installation and construction method of the anchor cable is basically the same as that of the embodiment 1, and the difference is that:
(1) at the position of each pre-warning steel strand 1, which is close to the orifice for a certain distance, the pre-warning lever 7 is used for fixing core components, namely a sliding rod 5 and a spring 6, of the pre-warning device 4 on the pre-warning steel strand 1; the fixed positions of the corresponding early warning devices 4 of different early warning steel strands 1 can be the same or different.
(2) Each beam of the steel strand for early warning 1 respectively penetrates out of different through holes on the anchorage device; the sliding rod 5 and the spring 6 (which are sleeved together) of each early warning device 4 are respectively pre-installed on the anchorage device 3 and penetrate out of different guide pipes 8.
(3) Respectively drawing the outer end of each spring 6 to enable the spring to be in a stretching state; after cutting off the excess part, the outer end of the spring is fixed to the end of the corresponding guide tube 8 by means of a pin 9.
(4) Respectively applying pre-stretching stress to the multiple steel strands 1 for early warning; according to the design requirements of the early warning function, the pre-stretching stress can be equal or unequal.
(5) And arranging a protective cover or adopting other methods to protect each bundle of early warning steel stranded wires 1 and the exposed end of the corresponding early warning device 4.
The rest of the installation and construction steps are the same as those of the embodiment 1.
Claims (9)
1. The utility model provides a prestressed anchorage cable with fracture early warning function, includes many anchor steel strand wires (2) and ground tackle (3), characterized by: one or more steel stranded wires (1) for early warning and early warning devices (4) with the same number as the steel stranded wires for early warning are arranged; the assembly relationship of the components is as follows:
one end of the steel strand for early warning and one end of the steel strand for anchoring in the drill hole are anchored in the rock, and the other ends of the drill hole are fixed by an anchorage device and apply pre-stretching stress; the steel strand for early warning and the steel strand for anchoring are arranged in parallel with each other in the borehole, the former has a tensile strength lower than the latter or is applied with a pre-stretching stress higher than the latter;
the early warning device (4) consists of a sliding rod (5), a spring (6), an early warning lever (7) and a guide pipe (8); the guide pipe (8) penetrates through the anchorage device (3) and is fixed with the anchorage device; the middle fulcrum of the early warning lever (7) is fixed on the inner wall of the drilled hole; the springs (6) are sleeved on the sliding rod (5) and penetrate through the guide pipes (8); the tail ends of the sliding rod (5) and the spring (6) in the drilled hole are fixed at one end of the early warning lever (7), and the other end of the early warning lever (7) is fixed on the early warning steel strand (1); after the spring (6) is installed, the spring is initially stretched, and the exposed end of the spring is fixed at the exposed end (the end exposed out of the anchor) of the guide pipe (8); the exposed end of the sliding rod (5) is in a free state.
2. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: and a protective cover is arranged at one end of the early warning device (4) exposed out of the anchorage device.
3. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: the protective cover adopts a transparent organic glass cover.
4. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: in the early warning device (4), the length of a drill hole of the guide pipe (8) is 10-20 cm; the length of the spring (6) in a non-stretching state is more than or equal to the total length of the guide pipe (8); the length of the exposed section of the sliding rod (5) is more than or equal to 5cm after installation.
5. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: the sliding rod (5) is an aluminum rod or a nylon rod; the spring (6) is made of steel; the guide pipe (8) is a glass fiber pipe, an aluminum pipe or a stainless steel pipe.
6. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: the steel wire material specifications of the early warning steel strands (1) are the same or different; and the steel wire material specifications of the early warning steel strand (1) and the anchoring steel strand (2) are the same or different.
7. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: the ratio of the pre-stretching stress value of the steel strand (1) for early warning to the pre-stretching stress value of the steel strand for anchoring is 1.5-2.0.
8. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: the ratio of the tensile strength limit value of the steel strand (1) for early warning to the tensile strength limit value of the steel strand for anchoring is 0.80-0.95.
9. The pre-stressed anchor cable with a fracture warning function as claimed in claim 1, wherein: the ultimate tensile capacity of the steel strand (1) for early warning is 5% -10% of the total ultimate tensile capacity of all the steel strands (2) for anchoring.
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| GB950552A (en) * | 1961-08-22 | 1964-02-26 | William George Burton Mcclean | Improvements in or relating to visual warning devices for indicating loss of tensionin bolts |
| CN104420692A (en) * | 2013-08-31 | 2015-03-18 | 青岛德盛利立体停车设备有限公司 | Wire rope breakage protector for stereo parking system |
| CN205277467U (en) * | 2015-12-31 | 2016-06-01 | 西安科技大学 | Elasticity lets presses early warning stock |
| CN206189402U (en) * | 2016-11-09 | 2017-05-24 | 西南交通大学 | Early warning device that stock was used |
| CN106677066A (en) * | 2017-03-05 | 2017-05-17 | 郑州大学 | Method for pre-warning breakage of parallel strand stayed cable |
| CN206570699U (en) * | 2017-03-05 | 2017-10-20 | 郑州大学 | A kind of suspension cable structure with warning function |
| CN208168913U (en) * | 2018-04-23 | 2018-11-30 | 华北科技学院 | A kind of mine anchor rope component fracture prior-warning device |
| CN110821541A (en) * | 2019-12-20 | 2020-02-21 | 河南理工大学 | Coal mine underground graded early warning protective anchor rod device and protective method thereof |
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| CN113266007B (en) | 2022-05-20 |
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