CN116557022A - A recovery method based on hot-melt anchor cables for tunnels - Google Patents

Abstract

The invention relates to a recycling method of a hot-melt anchor cable for a tunnel, which comprises the following steps: filling and packaging a hot melt reagent in the shell; mounting a heating assembly to the housing and bringing it into physical contact with the hot melt agent; the shell is clamped to the anchor cable bundle, and the heating assembly is controlled to work through the controller; controlling the heating component to perform physical heating on the hot-melt reagent so as to enable the hot-melt reagent to release chemical reaction heat; the hot melt agent is contacted with the tendon to fuse and recover the tendon by the heat of chemical reaction. Further comprises: installing a monitoring part and a grouting part to the anchor cable bundle; the stress change of the anchor cable bundle is monitored in real time through a strain sensor of the monitoring part; and when the anchoring force of the anchor cable bundle is lower than a set threshold value, performing secondary grouting on the anchor cable through the grouting part. The recycling method can realize recycling of the anchor cable and the anchor rod, and can reduce material consumption and engineering cost.

Description

A recovery method based on hot-melt anchor cables for tunnels

Case Description

The original basis of this divisional application is the Chinese patent application with the application number CN 202210362034X, the application date is April 7, 2022, and the invention title is "An anchor cable recovery device and method based on a hot-melt structure".

technical field

The invention relates to the technical field of geotechnical engineering, relates to the drilling technology of soil layers or rocks, in particular to a hot-melt anchor cable for tunnels and a recovery method for the hot-melt anchor cables for tunnels.

Background technique

At present, anchoring engineering is widely used in many adjacent areas such as foundation pits, tunnels, and disaster management. After reaching the expected goal, some components in the anchoring engineering, such as anchor cables and anchor rods in the free section, lose their function, and these The parts can be recycled, so taking them out can not only reduce the consumption of materials, but also reduce the construction cost and save resources.

For this reason, people have developed the recyclable anchor cable technology. After the anchor cable completes the task, the anchor cable can be recycled, which can not only avoid the problem that the anchor cable exceeds the building red line, but also reduce the construction cost. Currently, a variety of recoverable anchor cable technologies have been developed. Recyclable anchor cables are safe, fast, and easy to recycle. The recycled steel strands can be reused, which makes up for the shortcomings of early anchor cable technology.

The hot-melt recovery anchor cable is a common anchor cable form in the recoverable anchor cable technology. Its principle is mainly to remove the core by electrifying the hot-melt anchor. The cord is pulled out and recycled.

For example, a low-melting-point alloy anchor bolt intelligent construction system and its use and recycling method provided by the invention patent with the publication number CN114754053A, the scheme provides a low-melt-point alloy anchor bolt intelligent construction system, including the anchor bolt assembly, said The anchor bolt assembly includes an anchor bolt. The bottom end of the anchor bolt is connected with a solid low-melting point alloy, and a heating wire is buried inside the low-melting point alloy. The two ends of the heating wire are respectively connected with a first electrical contact and a second electrical contact. . The outer side of the anchor bolt group is connected with a spacer assembly through a threaded structure, the spacer assembly is electrically connected to the mobile power supply, and the spacer assembly and the mobile power supply are respectively electrically connected to the control device. And provide a kind of recovery method of anchor bolt and low melting point alloy, comprise the following steps:

Step 1, installing the spacer assembly on the threaded structure of the anchor bolt;

Step 2, rotating the spacer assembly so that the first electrical contact is connected to the first electrical contact plate, and the second electrical contact is connected to the second electrical contact plate;

Step 3, using the control device to start the mobile power supply to supply power to the heating wire to heat the low melting point alloy;

Step 4, using a temperature sensor to measure the temperature of the molten low-melting point alloy, and when the temperature rises to the set heating temperature upper limit T, stop power supply and heating;

Step 5, pulling out the anchor bolt with the spacer assembly from the anchor hole on the concrete body for recycling.

It can be seen that the invention is to energize the spacer assembly to heat the low-melting-point alloy that wraps the anchor bolt, and use the temperature sensor to detect the temperature of the low-melting-point alloy in real time, so as to pull out the anchor bolt in time when the low-melting-point alloy melts, so as to achieve recovery. Purpose. However, this invention ignores that during the recovery process, with the movement of the anchor bolt, the anchoring force of the anchor bolt also changes in real time. However, this invention does not have a real-time force measurement function, so that when the anchoring force of the anchor bolt changes, the anchoring force level cannot be adjusted in a timely and effective manner.

In addition, on the one hand, due to differences in the understanding of those skilled in the art; The present invention does not possess the characteristics of these prior art, on the contrary, the present invention already possesses all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a hot-melt anchor cable for tunnels and a recycling method for the hot-melt anchor cables for tunnels, aiming to solve at least one or more technical problems existing in the prior art .

To achieve the above object, the present invention provides a hot-melt anchor cable for tunnels, comprising:

A hot-melt part, which has a housing clamped on the anchor cable bundle, the housing is packaged with a hot-melt reagent, and the hot-melt reagent includes an activation component and a fusing component;

a heating element coupled to the housing and in physical contact with the active component;

a controller for controlling the heating assembly to physically heat the active component;

in,

In the state where the heating component is controlled by the controller to physically heat the activation component, the activation component can release the first chemical reaction heat based on the physical heating and ignite the fusing component through the first chemical reaction heat, and the fusing component is thus The first chemical reaction heat burns and releases the second chemical reaction heat, and when the fusing component contacts the anchor cable bundle, the fusing component can thermally fuse the anchor cable bundle through the second chemical reaction.

In the present invention, the fusing of the anchor cable bundle is mainly accomplished by the high amount of chemical reaction heat generated by the hot-melt reagent. A large amount of heat can be released instantly through the oxidation-reduction reaction, so the anchor cable bundle can be fused in a very short period of time to recover it, without the need to continuously heat the anchor cable bundle as in the prior art It takes a lot of time to fuse the anchor cable bundle, which makes the recovery efficiency of the anchor cable extremely low, and because the running state of the live wire in the deep underground space is also relatively complicated, it is impossible to effectively guarantee the continuous stability of the live wire to the anchor cable bundle. In the present invention, the energized wire only needs to provide an initial heat energy enough to ignite the hot-melt reagent, and the subsequent fusing of the anchor cable can be done by means of the hot-melt reagent in the molten state, and the hot-melt reagent can instantly provide a high Therefore, there is no need to consume too much energy of the energized wire, the entire fusing process takes a very short time, and the efficiency and stability of anchor cable recovery are significantly improved.

Preferably, the heating assembly includes a signal wire and a heating wire, the signal wire is electrically connected to the heating wire and the controller, wherein at least part of the heating wire is in physical contact with the active component, so as to be able to ignite the active component driven by the controller, It has the thermal energy to ignite the fusing component.

Preferably, the hot-melt reagent encapsulated in the shell includes magnesium strips, igniters and thermite, and the magnesium strips are in direct contact with the heating wire, wherein, when the heating wire is controlled by the controller to work, the heating wire transfers heat to the magnesium strip To ignite it, the magnesium rod burns to ignite the igniter and thermite so that the thermite is transformed into a molten state by thermite reaction.

Preferably, one side of the shell clamped on the anchor cable bundle is provided with a sealing plate for encapsulating the hot-melt agent, and when the thermite contacts with the igniter and turns into a molten state, the thermite melts the sealing plate through the shell Fluid flows out to come into contact with the anchor strand bundle and fuse it.

Preferably, the hot-melt reagent is filled into the casing through the medicament passage of the casing, and the medicament passage is blocked by a matching plug, wherein the heating wire is inserted into the casing through the plug and physically contacts the magnesium strip .

Preferably, the anchor cable bundle is equipped with a monitoring part, the monitoring part at least includes a strain sensor, and the strain sensor is communicatively connected to the controller in a manner of monitoring and transmitting stress change data of the anchor cable bundle.

Preferably, the anchor cable bundle is equipped with a grouting part, and the grouting part is composed of a grouting device and a grouting channel, wherein the grouting channel includes a number of grouting pipes arranged in the anchor cable bundle, and the grouting pipe is connected to the borehole Connected to the injector outside the mouth.

Preferably, when the controller determines that the anchoring force of the anchor cable bundle is lower than a set threshold based on the stress monitoring data of the strain sensor, the grouting part implements secondary grouting to the anchoring section of the anchor cable bundle.

Preferably, the present invention relates to a recovery method for hot-melt anchor cables for tunnels, the recovery method comprising:

Filling and packaging hot melt reagents in the housing;

Install the heating element to the housing and make it in physical contact with the hot melt reagent;

Snap the shell to the anchor cable bundle, and control the heating component to work through the controller;

Control the heating component to implement physical heating to the hot-melt reagent, so that the hot-melt reagent releases the heat of chemical reaction;

A hot-melt reagent is brought into contact with the anchor strands to melt and recover the anchor strands by means of the heat of chemical reaction.

Preferably, the recovery method also includes:

Install the monitoring part and the grouting part to the anchor cable bundle;

Monitor the stress change of the anchor cable bundle in real time through the strain sensor in the monitoring department;

When the anchoring force of the anchor cable bundle is lower than the set threshold, secondary grouting is performed on the anchor cables through the grouting part.

The beneficial technical effects of the present invention include: realizing the recyclability of the anchor cable and the anchor rod through the controllable thermal fusion device, which can reduce the consumption of materials and reduce the engineering cost, especially the structure of the controllable thermal fusion device of the present invention is simple and does not require High-precision processing, low production cost, convenient use and maintenance, and high recovery efficiency; the monitoring part monitors the stress-strain change of the anchor cable in the free section, which can reflect the anchoring force and predict the anchoring effect of the anchor cable. evaluation; if the anchoring project fails to achieve the expected effect, the grouting part can also be used to achieve secondary grouting to enhance the anchoring force of the anchor cable; the main components of the anchor cable are designed with modularization and mechanization, which is convenient for processing and manufacturing, reducing The production cost is low, and the modular design is easy to disassemble and assemble, and the maintenance and replacement are faster.

Description of drawings

Fig. 1 is a schematic structural view of a hot-melt anchor cable for a tunnel in a preferred embodiment provided by the present invention;

Fig. 2 is a schematic structural view of a hot-melt part of a preferred embodiment provided by the present invention;

Fig. 3 is a schematic structural view of another preferred embodiment of the hot-melt part provided by the present invention;

Fig. 4 is a schematic structural view of a housing of a hot-melt part according to a preferred embodiment of the present invention.

List of reference signs

1: Anchor bundle; 2: Hot-melt part; 3: Anchoring section; 4: Grouting channel; 5: Controller; 6: Grouting device; 7: Drilling hole; 8: Strain sensor; 9: Signal line ;10: signal transmission channel; 11: heating wire; 12: magnesium strip; 13: igniter; 14: thermite; 15: sealing plate; 16: shell; 17: agent channel; 18: sealing block; 19 : glycerin bottle; 20: potassium permanganate.

Detailed ways

A detailed description will be given below in conjunction with the accompanying drawings.

The invention provides a hot-melt anchor cable for a tunnel, which consists of a hot-melt part 2 for recovering the anchor cable, a monitoring part for monitoring the anchoring force of the anchor cable, and a grouting part for secondary grouting of the anchor cable Ministry composition. In particular, the hot-melt part 2 , the monitoring part and the grouting part are mechanically and/or electrically connected to the anchor cable bundle 1 so as to cooperate with the anchor cable.

According to a preferred embodiment shown in Figure 1, the monitoring section can include a controller 5 and a strain sensor 8 (such as a strain gauge), and the strain sensor 8 is signal-connected to the controller through a signal transmission channel 10 (such as a signal transmission cable) 5. Particularly, in the process of using or recovering the anchor cable, the strain sensor 8 can monitor the stress change data of the anchor cable bundle 1 in real time, and transmit the stress change data to the controller 5 through the signal transmission channel 10, and the controller 5 The stress change data of the anchor cable bundle 1 can be analyzed and calculated, so as to provide data support for the anchoring quality of the anchor cable. In particular, the signal transmission mode of the strain sensor 8 can not only adopt a wired mode, but also can adopt a wireless transmission mode depending on the use scene of the anchor cable.

According to a preferred embodiment shown in FIG. 1 , the grouting part can be composed of a grouting device 6 and a grouting channel 4 . Further, the grouting channel 4 includes a plurality of grouting pipes installed in the anchor cable bundle 1 , and the grouting channel 4 is connected with the grouting device 6 outside the bore hole 7 . In particular, during the process of recovering the anchor cable bundle 1, if the monitoring unit monitors and determines that the current anchoring force of the anchor cable bundle 1 is less than the set threshold value, the grouting force composed of the grouting device 6 and the grouting channel 4 can be used to Secondary grouting is performed on the anchor section 3 of the anchor cable bundle 1 to enhance the anchoring force of the anchor cable bundle 1 , especially the anchor section 3 .

According to a preferred embodiment, in the prior art, when the strain sensor 8 is used to monitor the stress change of the anchor cable bundle 1, the monitoring and transmission frequency of the strain sensor 8 are generally known and fixed, and when the anchor cable bundle 1 When the anchoring force attenuates abnormally, the anchoring effect of the anchor cable bundle 1 will be greatly reduced or even cause the anchoring effect to disappear, and the strain sensor 8 usually only sends the corresponding monitoring data at the preset sampling node, and the controller 5 also The anchoring force of the anchor cable bundle 1 can only be judged when the corresponding monitoring data is received. Therefore, when the anchoring force of the anchor cable bundle 1 changes abnormally, there is a certain hysteresis in the conventional monitoring and judgment methods. Hysteresis is extremely unfavorable for the strengthening of formations by anchor cables, especially in the case of continuous accumulation of this delayed sending and receiving effect, the error between the actual change of the anchoring force of the anchor cable bundle and the expected change may be as high as several times, and The change of the anchoring force of the anchor cable bundle, especially when the anchor cable bundle 1 is recovered, the attenuation of the anchoring force of the anchor cable bundle also affects the timing of the second grouting of the anchor cable through the grouting part, thus affecting the anchorage. quality, especially when the anchoring force of anchor cable bundle 1 is significantly lower than the set threshold within a certain range, if the secondary grouting is not performed in time, even if the subsequent grouting is performed, the best grouting may be missed. The anchoring force of the anchor cable bundle 1 cannot be restored to the original level due to the timing of the slurry.

According to a preferred embodiment, in the present invention, the sampling period of the strain sensor 8 can be set according to the preset strain amplitude corresponding to the stress change of the anchor cable bundle 1, in other words, when the anchor cable bundle 1 is recovered During the process, the time-related stress change information of the anchor cable bundle 1 is recorded and transmitted via the strain sensor 8 with the preset strain amplitude of the anchor cable bundle 1 as the starting event. Specifically, the preset strain amplitude can be set by the engineering designer according to the engineering experience value or the calculated value based on the engineering simulation experiment. When the cable is pulled, the attenuation of the anchor cable bundle 1 changes, and a corresponding time-dependent change curve of the anchoring force can be formed, so that the preset strain amplitude can be set according to the theoretical variation trend of the anchoring force of the anchor cable bundle.

Preferably, each time the anchor cable bundle 1 produces a single preset strain amplitude or the anchoring force of the anchor cable bundle 1 reduces the time consumed by a single preset strain amplitude value, it is the sampling period of the strain sensor 8. When the anchor cable bundle 1 When the stress change of is accelerated or slowed down, the time consumed by the single preset strain amplitude of the anchor cable bundle 1 will also change. In particular, the ratio of the sampling period of the strain sensor 8 to the preset strain amplitude can be used to characterize the stress change rate of the anchor cable bundle 1, so that the anchoring force decay rate of the anchor cable bundle 1 can be known. The larger the ratio, the It means that the anchoring force decay rate of the anchor cable bundle 1 is slower, that is, the longer the anchor cable bundle 1 takes when a single preset strain amplitude or its anchoring force is reduced by a single preset strain amplitude, and vice versa, the smaller it means The faster the decay rate of the anchoring force of the anchor cable bundle 1 is, the shorter the time it takes for the anchor cable bundle 1 to have a single preset strain amplitude or its anchoring force to decrease by a single preset strain amplitude.

According to a preferred embodiment, when the anchoring force decay rate of the anchor cable bundle 1 slows down, the strain sensor 8 can reduce the frequency and amount of monitoring data transmitted to the controller 5, so as to reduce the amount of data interaction , to reduce the delay generated in the data transmission interaction process, so that the analysis and calculation process of the controller 5 for the anchoring force of the bolt is more timely and smooth, especially it can respond in time to the change of the anchoring force of the bolt, so that it can be timely through the injection The slurry portion is used to enhance the anchoring force of the anchor cable bundle 1.

According to a preferred embodiment, as the anchoring force of the anchor cable bundle 1 continues to attenuate, the risks corresponding to different anchoring force variation intervals are different, and the corresponding grouting amounts are also different. Preferably, for different anchoring force variation intervals, the sampling period of the strain sensor 8 is different, and the corresponding preset strain amplitudes are also different. Specifically, engineering designers can set different anchoring force change intervals for the anchor cable bundle 1 according to the anchoring engineering requirements, and set different preset strain amplitudes for each anchoring force change interval, so that as the anchoring force changes, The monitoring frequency of the anchor cable bundle 1 by the strain sensor 8 is adjusted in time, thereby improving the timeliness of monitoring the anchoring force of the anchor cable bundle 1 .

In particular, with the continuous attenuation of the anchoring force of the anchor cable bundle, the possibility of anchor cable failure is also greater, so as the anchoring force of the anchor cable bundle continues to decrease, the preset strain amplitude of the anchor cable bundle 1 can be set to Linear/non-linear reduction, to shorten the corresponding sampling period, so that the monitoring frequency of the anchoring force of the anchor cable bundle 1 by the strain sensor 8 is more intensive, so that the change of the anchoring force of the anchor cable bundle can be known in time, especially when the anchoring force is constant In the process of decreasing, the grouting part can be started in time according to the change of the anchoring force to carry out secondary grouting on the anchor cable, so as to deal with the attenuation of the anchoring force in time, and maintain the corresponding anchoring effect through timely grouting. When the anchoring force of the anchor cable bundle is increased or restored after grouting, the preset strain amplitude of the anchor cable bundle 1 can be increased linearly/nonlinearly with the increase of the anchoring force, thus, the anchoring force of the anchor cable bundle continues to decrease In the process, by shortening the sampling period of the strain sensor 8, the frequency of analysis and determination of the anchoring force of the anchor cable bundle by the controller 5 is more intensive and frequent, so that the attenuation state of the anchoring force of the anchor cable bundle can be known in time, and the grouting part can be started in time Performing secondary grouting, on the other hand, can adjust the monitoring frequency of the anchoring force of the anchoring force by the strain sensor 8 in time according to the change of the anchoring force of the anchoring force, so that the monitoring frequency of the anchoring force of the anchoring force is more reasonable and accurate, especially For example, in the state where the attenuation of the anchoring force of the anchor cable bundle is weak, frequent monitoring may be unnecessary, because it will increase the amount of data interaction, occupy computing resources and cause delays, and at the same time, excessive data output will also generate certain These pseudo-data will affect the analysis and judgment of the controller 5 on the anchoring force of the anchor cable bundle, thereby affecting the optimal grouting timing.

According to a preferred embodiment, as shown in FIG. 1 , the hot-melt part 2 is fixed on the outside of the free section of the anchor cable bundle 1 , and a casing 16 is used as the outer shell of the whole device and the carrier of the hot-melt component. Further, as shown in Figure 4, the housing 16 is a hollow housing made of ceramics, and the housing 16 is spliced by at least two semi-cylindrical housings, each of which has a Partially recessed locking parts, and the combination of the two locking parts forms a cylindrical channel for passing out the anchor cable bundle. Preferably, the shell 16 made of ceramics has good high temperature resistance and can withstand the ultra-high temperature generated during the thermite reaction, and the material of the ceramic shell is cheap, and the manufacturing process is also very simple.

In particular, when using the hot-melt part 2 to realize the recovery of the anchor cable bundle 1, the controller 5 and the signal line 9 connected to the controller 5 are used to activate the hot-melt components in the casing 16, and finally realize the aluminum thermally reactive. Specifically, the ambient temperature generated by the thermite reaction is about 2000°C to 3000°C, and the sealing material used for sealing can be melted by means of a large amount of heat generated by the thermite reaction, so that the hot melt reagent sealed in the shell 16 can flow out , the hot melt agent (hot melt metal) in the molten state can fuse the anchor cable bundle 1 after contacting the anchor cable bundle 1, or the ultra-high temperature of the molten hot melt agent can greatly reduce the yield strength of the anchor cable bundle 1 In order to facilitate the recovery of the anchor cable bundle 1 by strong pulling.

According to a preferred embodiment, as shown in Figure 2, the housing 16 of the hot-melt part 2 is connected with a heating wire 11, the heating wire 11 is connected to the signal line 9, the signal line 9 is externally connected to the controller 5, and the controller 5 can The heating wire 11 is controlled to work through the signal line 9 . Further, after the signal line 9 is energized by the controller 5, the heating wire 11 generates a high temperature, which can provide energy for the oxidation reaction of the magnesium strip 12 sealed in the housing 16 to ignite the magnesium strip 12, and the magnesium The energy of the burning of the strip 12 further ignites the igniter 13 , which contacts the thermite 14 within the housing 16 and activates the thermite 14 .

According to a preferred embodiment, after the thermite 14 is activated by the igniter 13 at a high temperature, a strong redox reaction, that is, a thermite reaction, will occur, thereby releasing a large amount of heat and forming a molten metal with a temperature as high as 2000°C. The molten metal formed by the reaction of the hot agent 14 will melt the sealing plate 15 after contacting the sealing plate 15 on the side of the shell 16 close to the anchor cable bundle 1, thereby further flowing out and contacting the anchor cable bundle 1, the molten metal The ultra-high temperature can fuse the anchor cable bundle 1, or greatly reduce the yield strength of the anchor cable bundle 1. At the same time, the anchor cable bundle 1 can be pulled out with the tensioning equipment outside the drilling hole 7, so as to realize the anchor cable bundle 1. recycling.

According to a preferred embodiment, the chemical reagents used in the entire thermite reaction are injected into the interior of the housing 16 through the chemical reagent channel 17 reserved on the housing 16. After the chemical reagent is filled, the chemical reagent channel is sealed with a plug 18. 17 for sealing, the heating wire 11 is inserted into the casing 16 through the sealing plug 18, and contacts with the magnesium strip 12.

According to a preferred embodiment, Fig. 3 shows another preferred structural schematic diagram of the hot-melt part 2 of the present invention. Specifically, the signal line 9 is energized through the controller 5, and the glycerin bottle 19 is punctured by the energized signal line 9, so that the glycerin in the glycerin bottle 19 reacts with the potassium permanganate 20 pre-sealed in the housing 16 And release heat to activate or ignite the igniter 13 through the reaction heat of glycerol and potassium permanganate 20, and the igniter 13 further ignites the thermite 14, so that the thermite 14 undergoes a strong thermite reaction to form a The ultra-high temperature molten metal finally contacts the anchor cable bundle 1 and fuses it, so as to realize the recovery of the anchor cable bundle 1 . In particular, the sealing plate 15 shown in FIG. 2 can be made of a thin iron plate, or replaced by other materials with high strength but not resistant to high temperature, such as PPS material.

For ease of understanding, the working principle of a hot-melt anchor cable for tunnels according to the present invention will be described below.

When using the recyclable anchor cable based on the hot-melt structure of the present invention, the hot-melt part 2 is assembled and fixed on the anchor cable bundle 1 in advance, and the anchor cable bundle 1 is lowered into the soil to be anchored through the drill hole 7, and the During the process of using and recovering the anchor cable bundle 1, the monitoring part composed of the strain sensor 8 and the controller 5 can be used to monitor the stress change of the anchor cable bundle 1 in real time, and when the corresponding anchoring force of the anchor cable bundle 1 is less than the standard threshold Or when the strength is designed, secondary grouting is performed to the anchoring section 3 of the anchor cable bundle 1 through the grouting part composed of the grouting device 6 and the grouting channel 4, so as to enhance or compensate the corresponding anchoring force of the anchor cable. In particular, when the hot-melt part 2 needs to be used to recover the anchor cable bundle 1, the signal line 9 connected to the housing 16 can be energized through the controller 5 outside the drilling hole 7, so that the signal line 9 connected to the signal line 9 The heating wire 11 works. Further, the heating wire 11 energizes and generates heat to quickly ignite the magnesium strip 12 sealed in the casing 16, the magnesium strip 12 burns and further ignites the igniter 13, and the igniter 13 contacts the thermite 14 to activate it, and thermite Under the combustion aid of the igniter 13, the agent 14 undergoes a strong oxidation-reduction reaction, releases a large amount of heat and forms ultra-high temperature molten metal, and the molten thermite 14 melts the sealing plate 15 of the shell 16 and flows out, and is connected with the anchor After the cable bundle 1 contacts, the anchor cable bundle 1 is fused, thereby realizing the recovery of the anchor cable bundle 1 .

According to a preferred embodiment, in the existing hot-melt anchor, the hot-melt anchor is usually energized to remove the core, and the steel strand is pulled out and recycled after the hot-melt anchor is removed after the power is turned on for a certain period of time. However, the existing hot-melt anchors rely on the live wires to directly heat the hot-melt anchors to remove the core. Therefore, before the steel strand reaches the corresponding fusing temperature or meets the corresponding recoverable yield strength, it needs to be carried out for a long time through the live wires. Only heating can fuse the anchor cable bundle 1, so the recovery process of the anchor cable bundle 1 will take a lot of time, especially a lot of preheating preparation time; secondly, because the anchor cable bundle 1 is buried in the deep underground space, and the underground soil The heat transfer effect of the body is relatively poor, so in the process of using the energized wire to continuously heat the anchor cable bundle 1 for a long time, it may involve the need to continuously output a stable large current. However, there are many uncertain factors in the underground space. And because the heat transfer line of the energized wire is very long, in the process of using the energized wire to continuously heat the anchor cable bundle 1, it is very likely that the heat of the energized wire cannot be effectively transferred to the anchor cable bundle 1, especially in the underground space. The medium-current conducting wire is extremely prone to failure and damage, and it is also difficult to maintain the current output for a long time.

According to a preferred embodiment, in the embodiment of the present invention, the conducting wire only provides initial heat for activating the corresponding hot-melt reagent, and the fusing of the anchor cable bundle 1 mainly depends on the ultra-high temperature during the reaction of the hot-melt reagent To be done. In particular, when it is necessary to fuse the anchor cable bundle 1 to recover it, the signal line 9 can be energized through the controller 5 to make the heating wire 11 work, compared to directly conducting continuous physical heat transfer through the heating wire 11 to turn the anchor For the fusing of the cable bundle 1, the heating wire 11 only needs to provide relatively low heat energy enough to ignite the magnesium strip 12, and the subsequent fusing of the anchor cable bundle 1 completely depends on the chemical reaction of the hot-melt reagent such as the magnesium strip 12 and the chemical reaction heat generated by it, so there is no need to continuously provide a large amount of heat energy through the heating wire 11, which can greatly reduce energy consumption and waste. When the magnesium strip 12 burns and further ignites the igniter 13, the ignition The agent 13 burns and generates higher energy than the combustion of the magnesium strip 12 to ignite the thermite 14. The thermite 14 burns and forms a molten metal with an ultra-high temperature (up to 2000°C to 3000°C) through a redox reaction. The molten metal contacts the anchor cable bundle 1 and fuses it, and at the same time cooperates with the tensioning equipment outside the drilling hole 7 to pull out the melted anchor cable bundle 1 to complete the recovery.

Preferably, the entire oxidation-reduction reaction process of the thermite 14 is very rapid and violent, and a large amount of heat can be released in an instant. 14 through its own thermite reaction, the ambient temperature around the anchor cable bundle 1 can reach thousands of degrees Celsius in an instant, so that the whole process from electrifying the heating wire 11 to the thermite reaction of the thermite 14 takes place in an extremely short period of time can be fully completed, so the efficiency of the entire anchor cable recovery will be significantly improved; secondly, the main products of the thermite reaction are various metal oxides, and after the anchor cable bundle 1 is fused by the thermite 14, the thermite reaction remains The reaction product will not cause secondary damage to the anchor cable bundle 1, and will not affect the use of the recycled steel strands, and the metal oxide produced by the aluminothermic reaction will not cause damage to the underground space structure even if it remains in the underground space. destruction; in addition, the entire redox reaction process of the thermite 14 is usually known and single, and has good sustainability, compared to directly using the energized wire to continuously heat the anchor cable bundle 1 and keep the energized wire continuously In the case of stable output, once the thermite reaction of thermite 14 starts, it will hardly be disturbed or affected by the surrounding environment, while the live wires in the complex and changeable underground space are more prone to instability due to many uncertain factors situation, this will increase unexpected difficulties and costs for the recovery of the anchor cable bundle 1, and the thermite reaction of the thermite 14 can instantly melt the anchor cable bundle 1, which not only improves the recovery efficiency of the anchor cable, but also greatly The possibility of uncertain factors is reduced, and the stability of anchor cable recovery is better.

On the other hand, the hot-melt structure of the existing hot-melt anchorage is usually designed and used in conjunction with the main structure of the anchor cable, so when designing this kind of hot-melt anchorage, high design and manufacturing costs will be introduced, and In the present invention, the main body/carrier of the hot-melt structure is a hollow shell made of ceramics, which can withstand the ultra-high temperature generated during thermite reaction, so as to avoid the indiscriminate flow of molten thermite 14; secondly, the ceramic The material price of the shell is very low, and the manufacturing process is relatively simple, which will greatly reduce the production and processing cost of the entire anchor cable structure; in addition, the overall design and structure of the hot-melt structure are simple, and its main body is mainly used as a heat sink. The carrier of the melting agent, so the whole structural body can be adapted to various types of anchor cables or bolts through slight modification or adjustment, so that the hot-melt part 2 of the present invention can be applied to different types of anchors without requiring additional new Add too many complex structures.

It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the scope of the disclosure of the present invention and fall within the scope of this disclosure. within the scope of protection of the invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative rather than limiting to the claims. The protection scope of the present invention is defined by the claims and their equivalents. The description of the present invention contains a number of inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally" all indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to propose a division based on each inventive concept right to apply.

Claims (10)

1. A recycling method of a hot-melt anchor cable for a tunnel is applied to the recyclable hot-melt anchor cable for the tunnel, and is characterized in that:

the anchor cable bundle (1) of the anchor cable is provided with a monitoring part,

the stress change of the anchor cable bundle (1) is monitored in real time through a strain sensor (8) of the monitoring part;

and when the anchoring force of the anchor cable bundle (1) is lower than a set threshold value, performing secondary grouting on the anchor cable bundle (1) through the grouting part.

2. The recycling method according to claim 1, characterized in that:

during the recovery of the cable bundle (1), time-dependent stress variation information of the cable bundle (1) is recorded and transmitted via the strain sensor (8) with a preset strain amplitude of the cable bundle (1) as a starting event.

3. The recycling method according to claim 1 or 2, characterized in that the cable further comprises a hot melt part (2) for cable recycling, the hot melt part (2) having a housing (16) clamped to the cable harness (1), the housing (16) being encapsulated with a hot melt agent, and the hot melt agent comprising an activating component and a fusing component.

4. The method of reclaiming according to any one of the preceding claims, wherein the cable further comprises:

a heating assembly coupled to the housing (16) and in physical contact with the activating component;

-a controller (5) for controlling the heating assembly to physically heat the activating component, the strain sensor (8) being communicatively connected to the controller (5).

5. The recycling method according to any of the preceding claims, characterized in that the cable harness (1) is fitted with a grouting section consisting of a grouting device and grouting channels, wherein,

the grouting channel comprises a plurality of grouting pipes which are arranged in the anchor cable bundle, and the grouting pipes are connected with a grouting device positioned outside the drill hole;

and when the controller (5) judges that the anchoring force of the anchor cable bundle (1) is lower than a set threshold value based on the stress monitoring data of the strain sensor (8), performing secondary grouting on an anchoring section of the anchor cable bundle through a grouting part.

6. The recycling method according to any of the preceding claims, characterized in that as the anchoring force of the anchor cable bundle (1) is continuously reduced, the preset strain amplitude of the anchor cable bundle (1) is reduced in a linear/nonlinear manner to shorten the corresponding sampling period, so that the anchoring force monitoring frequency of the strain sensor (8) to the anchor cable bundle (1) is more dense, and the grouting part is started in time to perform secondary grouting.

7. The recycling method according to any of the preceding claims, characterized in that the sampling period of the strain sensor (8) is different for different anchoring force variation intervals, the corresponding preset strain amplitude is also different.

8. A recycling method according to any of the preceding claims, characterized in that the pre-set strain amplitude of the tendon (1) is increased in a linear/non-linear manner when the anchoring force of the tendon (1) is raised or restored after grouting.

9. A recycling method according to any of the preceding claims, characterized in that before the stress monitoring of the tendon (1), it further comprises the steps of:

filling and packaging a hot melt reagent in a shell (16);

mounting a heating assembly to the housing (16) and bringing it into physical contact with the hot melt agent;

the shell (16) is clamped to the anchor cable bundle (1), and the heating assembly is controlled to work through the controller (5);

controlling the heating component to perform physical heating on the hot melt reagent so as to enable the hot melt reagent to release chemical reaction heat;

the hot-melt agent is brought into contact with the anchor cable bundle (1) to fuse and recover the anchor cable bundle (1) by means of the chemical reaction heat.

10. The recycling method according to any one of the preceding claims, characterized in that in a state in which the heating element is controlled by the controller (5) to perform physical heating on the activation component, the activation component is capable of releasing first chemical reaction heat based on the physical heating and igniting the fusing component by the first chemical reaction heat, the fusing component being burned by the first chemical reaction heat and releasing second chemical reaction heat, so that the fusing component is capable of fusing the anchor cable harness (1) by the second chemical reaction heat when the fusing component contacts the anchor cable harness (1).