Slope fender post stress automatic monitoring device and installation method thereof

Abstract

The invention discloses a slope fender post stress automatic monitoring device and an installation method thereof, and belongs to the field of slope monitoring, and the slope fender post stress automatic monitoring device comprises an auxiliary rib which is parallel to and welded with a main rib of a reinforcement cage, and a plurality of monitoring units which are sequentially fixed on the auxiliary rib from top to bottom, each monitoring unit comprises a vibrating wire type reinforcement meter fixed to the section position of the reinforcement, and the vibrating wire type reinforcement meters are electrically connected with a monitoring terminal arranged on the ground through shielded wires penetrating through the reinforcement cage. According to the slope fender post stress automatic monitoring device and the installation method thereof, the stress change conditions of fender posts at different positions can be monitored in real time on the premise that a fender post main reinforcement stress intensity system is not damaged, and the slope fender post stress automatic monitoring device and the installation method thereof have the advantages of being clear in data acquisition purpose, accurate in monitoring data, automatic in acquisition and monitoring and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of slope monitoring, and particularly relates to an automatic monitoring device for the stress of slope retaining piles and an installation method thereof. Background Art

[0002] Due to the influence of its own geological conditions, the problem of slope stability exists the risk of potential sliding for both natural slopes and slopes constructed during engineering construction, which may cause serious casualties and economic losses. With the rapid development of the economy and the transportation industry, corresponding engineering activities are becoming more and more frequent, and the construction scale is gradually increasing. At the same time, due to the continuous development of mountain highways, the geological conditions faced during the engineering design and construction process are becoming more and more complex; therefore, during this process, it is necessary to consider the influence of more complex engineering geological conditions on the slope stability state.

[0003] During the landslide disaster process, there are changes in a large number of measurable physical information. Physical field monitoring is a new direction for the development of disaster perception technology in recent years. It mainly considers that a large amount of energy will be released during the landslide disaster process, and this process is accompanied by the dynamic change of the internal stress of the slope and the generation of accompanying acoustic emission signals, mainly including stress monitoring, strain monitoring, acoustic emission monitoring, etc. Considering the large depth of the slope steel cage placement, it is necessary to carry out successive binding, segmented installation and then gradually lower it in order to proceed safely and orderly on the premise of ensuring the construction period. However, the traditional slope stress monitoring device has poor stability and protection ability, and it is difficult to realize the real-time monitoring of the stress of retaining piles at different depths on the slope surface. At the same time, it is difficult to accurately and timely obtain the disaster information of the landslide during and after the excavation process. Summary of the Invention

[0004] To solve the above problems, the present invention provides an automatic monitoring device for the stress of slope retaining piles and an installation method thereof. Without destroying the stress intensity system of the main reinforcement of the retaining pile, it can monitor the stress change of the retaining pile at different positions in real time, and has the advantages of clear data acquisition purpose, accurate monitoring data, automatic acquisition and monitoring, etc.

[0005] To achieve the above object, the present invention provides an automatic monitoring device for the stress of slope retaining piles, including auxiliary reinforcements arranged parallel to and welded with the main reinforcements of the steel cage, and a plurality of monitoring units fixedly arranged on the auxiliary reinforcements in sequence from top to bottom. Each of the plurality of monitoring units includes vibrating wire type strain gauges fixed at the cross-section position of the auxiliary reinforcement, and the vibrating wire type strain gauges are electrically connected to a monitoring terminal placed on the ground through shielded wires passing through the inside of the steel cage.

[0006] Preferably, the auxiliary reinforcement includes a plurality of reinforcing bar segments arranged in sequence from top to bottom. A vibrating wire type strain gauge is arranged between adjacent two reinforcing bar segments, and both ends of the vibrating wire type strain gauge are welded to the cross-section of the reinforcing bar segment through mounting rods.

[0007] Preferably, the lead wire of the vibrating wire type steel bar gauge is electrically connected to the shielded wire through a sealing component, and the wire core of the lead wire is welded to the wire core of the shielded wire with a dislocation;

[0008] The sealing component includes an inner sealing sleeve shrunk on the dislocation welding part, an intermediate sealing sleeve shrunk on the outside of the inner sealing sleeve, and an outer sealing sleeve shrunk on the outside of the intermediate sealing sleeve. The inner sealing sleeve, the intermediate sealing sleeve and the outer sealing sleeve are concentrically arranged, and the inner sealing sleeve, the intermediate sealing sleeve and the outer sealing sleeve are all heat shrinkable tubes.

[0009] Preferably, one end of the shielded wire away from the lead wire penetrates into the inside of the PVC hose, and the PVC hose bypasses the electric reel arranged inside the steel reinforcement cage and is electrically connected to the monitoring terminal.

[0010] Preferably, the buried depth of the steel reinforcement cage is 50000mm; vibrating wire type steel bar gauges are installed on the auxiliary steel bars at 15000mm, 21000mm, 27000mm, 33500mm, 37500mm, 41500mm, 45000mm from the ground.

[0011] An installation method of an automatic monitoring device for the stress of a slope retaining pile includes the following steps:

[0012] S1. Cut the auxiliary steel bars according to the set length to obtain multiple steel bar segments, and use the installation rod to weld and install the vibrating wire type steel bar gauge on two adjacent steel bar segments;

[0013] S2. Electrically connect the lead wire of the vibrating wire type steel bar gauge to the shielded wire, and install a sealing component;

[0014] S3. After hoisting and lowering the steel reinforcement cage in sections, weld the auxiliary steel bars installed with the vibrating wire type steel bar gauges to the main steel bars of the steel reinforcement cage;

[0015] S4. Tie a steel wire to one end of the shielded wire away from the lead wire, penetrate the steel wire into the inside of the PVC hose, pull the shielded wire into the inside of the PVC hose by pulling the steel wire through the electric reel, and then connect the shielded wire to the monitoring terminal.

[0016] Preferably, step S2 specifically includes the following steps:

[0017] S21. Disconnect the wire cores of the lead wire and the shielded wire with a stagger;

[0018] S22. Put an inner sealing sleeve on the outside of the wire core of the lead wire or the shielded wire, and put an intermediate sealing sleeve and an outer sealing sleeve on the lead wire and the shielded wire respectively;

[0019] S23. Align the misaligned positions of the cores of the lead-out wire and the shield wire, and perform misaligned welding. After the welding is completed, pull the inner sealing sleeve to the misaligned welding position so that the inner sealing sleeve covers the misaligned welding position. Heat the inner sealing sleeve from the middle to both ends to make the inner sealing sleeve shrink and fit outside the misaligned welding position, achieving primary sealing;

[0020] S24. Pull the middle sealing sleeve to the outside of the inner sealing sleeve so that the middle sealing sleeve covers the inner sealing sleeve, and line a circle of heat-shrinkable film on the inner walls at both ends of the middle sealing sleeve. Heat the middle sealing sleeve from the middle to both ends to make the middle sealing sleeve gradually tighten from the middle to both ends, expel the air between the middle sealing sleeve, the inner sealing sleeve, the lead-out wire and the shield wire, and melt the heat-shrinkable film. After curing, secondary sealing is achieved;

[0021] S25. Pull the outer sealing sleeve to the outside of the middle sealing sleeve so that the outer sealing sleeve covers the middle sealing sleeve, and line a circle of heat-shrinkable film on the inner walls at both ends of the outer sealing sleeve. Heat the outer sealing sleeve from the middle to both ends to make the outer sealing sleeve gradually tighten from the middle to both ends, expel the air between the outer sealing sleeve, the middle sealing sleeve, the lead-out wire and the shield wire, and melt the heat-shrinkable film. After curing, tertiary sealing is achieved.

[0022] Preferably, the inner sealing sleeve described in step S22 is a heat-shrinkable tube with a length of 45 mm and an inner diameter of 3 mm; the middle sealing sleeve is a heat-shrinkable tube with a length of 150 mm and an inner diameter of 12 mm; the outer sealing sleeve is a heat-shrinkable tube with a length of 200 mm and an inner diameter of 12 mm.

[0023] The present invention has the following beneficial effects:

[0024] 1. Without damaging the stress intensity system of the main reinforcement bars of the retaining pile, welding additional reinforcement bars beside the main reinforcement bars, and welding the vibrating wire type strain gauge to the specified monitoring position near the additional reinforcement bars through the installation rod, the stress changes at different depths can be monitored;

[0025] 2. Adopt three layers of heat-shrinkable tubes and heat-shrinkable films for three-layer sealing, thereby protecting the monitoring device from being damaged;

[0026] 3. Connect the fine steel wire to the cable joint, and then pull the steel wire through the electric winch in the upper steel cage, so that the acquisition shield wire connected by the PVC hose is always kept inside the steel cage to protect the acquisition cable from being damaged;

[0027] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the layout diagram of an automatic monitoring device for the stress of a slope retaining pile of the present invention;

[0029] Figure 2 is Figure 1 the enlarged view of part A in

[0030] Figure 3 is Figure 1 the enlarged view of part B in

[0031] Figure 4 is Figure 1 the sectional view taken along the CC direction in

[0032] Figure 5 is the installation schematic diagram of the vibrating wire type steel bar gauge of an automatic stress monitoring device for slope retaining piles according to the present invention;

[0033] Figure 6 is the assembly schematic diagram of the inner sealing sleeve of an automatic stress monitoring device for slope retaining piles according to the present invention;

[0034] Figure 7 is the assembly schematic diagram of the middle sealing sleeve of an automatic stress monitoring device for slope retaining piles according to the present invention.

[0035] Wherein: 1, vibrating wire type steel bar gauge; 11, lead wire; 111, wire core of the lead wire; 2, mounting rod; 3, shielded wire; 31, wire core of the shielded wire; 4, steel reinforcement cage; 41, main reinforcement; 42, auxiliary reinforcement; 5, sealing assembly; 51, inner sealing sleeve; 52, middle sealing sleeve; 53, heat shrinkable film; 6, electric reel; 7, steel wire. Detailed implementation manners

[0036] In order to make the purposes, technical solutions and advantages of the embodiments disclosed in the present invention clearer and more understandable, the following further details the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout.

[0037] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or server that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0038] Like reference numerals and letters indicate like items in the following drawings. Therefore, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] As Figures 1 - 7 shown, a stress automatic monitoring device for a slope retaining pile includes an auxiliary reinforcement 42 arranged in parallel with and welded to the main reinforcement 41 of the steel reinforcement cage 4, and a plurality of monitoring units fixedly arranged on the auxiliary reinforcement 42 in sequence from top to bottom. Each of the plurality of monitoring units includes a vibrating wire type strain gauge 1 fixed at the cross-section position of the auxiliary reinforcement 42. The vibrating wire type strain gauge 1 is electrically connected to a monitoring terminal placed on the ground through a shielded wire 3 passing through the inside of the steel reinforcement cage 4.

[0042] The auxiliary reinforcement 42 includes a plurality of steel bar segments arranged in sequence from top to bottom. A vibrating wire type strain gauge 1 is arranged between adjacent two steel bar segments. Both ends of the vibrating wire type strain gauge 1 are welded to the cross-section of the steel bar segment through a mounting rod 2.

[0043] The lead wire 11 of the vibrating wire type strain gauge 1 is electrically connected to the shielded wire 3 through a sealing assembly 5. The wire core 111 of the lead wire is welded to the wire core 31 of the shielded wire in a staggered manner. The sealing assembly 5 includes an inner sealing sleeve 51 shrunk at the staggered welding position, an intermediate sealing sleeve 52 shrunk outside the inner sealing sleeve 51, and an outer sealing sleeve shrunk outside the intermediate sealing sleeve 52. The inner sealing sleeve 51, the intermediate sealing sleeve 52, and the outer sealing sleeve are concentrically arranged, and the inner sealing sleeve 51, the intermediate sealing sleeve 52, and the outer sealing sleeve are all heat shrinkable tubes.

[0044] One end of the shielded wire 3 far from the lead wire 11 penetrates into the inside of a PVC hose, and the PVC hose bypasses an electric winding drum 6 arranged inside the steel reinforcement cage 4 and is electrically connected to the monitoring terminal, which is convenient for protecting the cable.

[0045] The embedded depth of the steel reinforcement cage 4 is 50000 mm; vibrating wire type steel bar meters 1 are installed on the additional steel bars 42 at positions 15000 mm, 21000 mm, 27000 mm, 33500 mm, 37500 mm, 41500 mm, and 45000 mm from the ground to achieve stress monitoring at different depths.

[0046] An installation method for an automatic stress monitoring device of a slope retaining pile includes the following steps:

[0047] S1. Cut the additional steel bars 42 according to the set length to obtain multiple steel bar segments, and use the installation rod 2 to weld and install the vibrating wire type steel bar meter 1 on adjacent two steel bar segments. In the process of welding the installation rod 2 in this embodiment, it is necessary to continuously cool the weld position at a low temperature;

[0048] S2. Electrically connect the lead wire 11 of the vibrating wire type steel bar meter 1 to the shielded wire 3, and install a sealing component 5;

[0049] Step S2 specifically includes the following steps:

[0050] S21. Disconnect the cores 111 of the lead wire and the cores 31 of the shielded wire in a staggered manner;

[0051] S22. Put an inner sealing sleeve 51 on the outer side of the core of the lead wire 111 or the core of the shielded wire 31, and put an intermediate sealing sleeve 52 and an outer sealing sleeve on the lead wire 11 and the shielded wire 3 respectively;

[0052] The inner sealing sleeve 51 described in step S22 is a heat shrinkable tube with a length of 45 mm and an inner diameter of 3 mm; the intermediate sealing sleeve 52 is a heat shrinkable tube with a length of 150 mm and an inner diameter of 12 mm; the outer sealing sleeve is a heat shrinkable tube with a length of 200 mm and an inner diameter of 12 mm. S23. Align the staggered positions of the cores 111 of the lead wire and the cores 31 of the shielded wire, and perform staggered welding. After welding is completed, pull the inner sealing sleeve 51 to the staggered welding position so that the inner sealing sleeve 51 covers the staggered welding position, and heat the inner sealing sleeve 51 from the middle to both ends so that the inner sealing sleeve 51 shrinks to the outside of the staggered welding position to achieve primary sealing;

[0053] S24. Pull the intermediate sealing sleeve 52 to the outside of the inner sealing sleeve 51 so that the intermediate sealing sleeve 52 covers the inner sealing sleeve 51, and line a circle of heat shrinkable film 53 on the inner walls at both ends of the intermediate sealing sleeve 52. Heat the intermediate sealing sleeve 52 from the middle to both ends so that the intermediate sealing sleeve 52 gradually tightens from the middle to both ends, discharge the air between the intermediate sealing sleeve 52 and the inner sealing sleeve 51, the lead wire 11, and the shielded wire 3, and melt the heat shrinkable film 53, and solidify to achieve secondary sealing;

[0054] S25. Pull the outer sealing sleeve to the outside of the middle sealing sleeve 52 so that the outer sealing sleeve covers the middle sealing sleeve 52. Line a circle of heat-shrinkable film 53 on the inner walls at both ends of the outer sealing sleeve. Heat the outer sealing sleeve from the middle to both ends, so that the outer sealing sleeve gradually tightens from the middle to both ends, expel the air between the outer sealing sleeve and the middle sealing sleeve 52, the lead wire 11 and the shield wire 3, and melt the heat-shrinkable film 53. After curing, three-level sealing is achieved.

[0055] S3. After the steel reinforcement cage 4 is hoisted and lowered in sections, weld the auxiliary reinforcement 42 equipped with the vibrating wire type steel bar stress gauge 1 to the main reinforcement 41 of the steel reinforcement cage 4.

[0056] S4. Tie a steel wire 7 to one end of the shield wire 3 far away from the lead wire 11, pass the steel wire 7 into the inside of the PVC hose, pull the steel wire 7 through the electric reel 6 to pull the shield wire 3 into the inside of the PVC hose, and then connect the shield wire 3 to the monitoring terminal.

[0057] Therefore, by adopting the above slope retaining pile stress automatic monitoring device and its installation method, the present invention can monitor the stress change of the retaining pile at different positions in real time without damaging the stress intensity system of the main reinforcement of the retaining pile, and has the advantages of clear data acquisition purpose, strong protection, high monitoring accuracy, accurate monitoring points, accurate monitoring data, automatic acquisition and monitoring, etc.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An automatic monitoring device for slope retaining pile stress, characterized in that: It includes auxiliary reinforcement arranged parallel to and welded to the main reinforcement of the steel cage, and multiple monitoring units fixed on the auxiliary reinforcement from top to bottom. The multiple monitoring units all include a vibrating-wire rebar meter fixed to the cross-section position of the auxiliary reinforcement. The vibrating-wire rebar meter is electrically connected to a monitoring terminal placed on the ground via a shielded wire passed through the inside of the steel cage.

2. The automatic monitoring device for slope retaining pile stress according to claim 1 is characterized by: The attached reinforcement comprises a plurality of steel bar segments arranged in sequence from top to bottom, a vibrating wire type steel bar meter is arranged between two adjacent steel bar segments, and both ends of the vibrating wire type steel bar meter are welded to the cross section of the steel bar segment via a mounting rod.

3. The automatic monitoring device for slope retaining pile stress according to claim 2 is characterized by: The lead wire of the vibrating wire rebar meter is electrically connected to the shielding wire via a sealing component, and the wire core of the lead wire and the wire core of the shielding wire are staggered welded; The sealing assembly includes an inner sealing sleeve shrunk at the offset welding position, a middle sealing sleeve shrunk at the outside of the inner sealing sleeve, and an outer sealing sleeve shrunk at the outside of the middle sealing sleeve. The inner sealing sleeve, the middle sealing sleeve and the outer sealing sleeve are arranged concentrically, and the inner sealing sleeve, the middle sealing sleeve and the outer sealing sleeve are all heat shrinkable tubes.

4. The automatic monitoring device for slope retaining pile stress according to claim 3 is characterized by: One end of the shielding wire away from the lead-out wire is inserted into the interior of the PVC hose, and the PVC hose is electrically connected to the monitoring terminal after passing around the electric reel arranged inside the steel cage.

5. The automatic monitoring device for slope retaining pile stress according to claim 4 is characterized by: The buried depth of the steel cage is 50000mm; vibrating wire rebar meters are installed on the attached reinforcement at 15000mm, 21000mm, 27000mm, 33500mm, 37500mm, 41500mm and 45000mm from the ground.

6. The method for installing the automatic monitoring device for slope retaining pile stress according to claim 5, characterized in that: The following steps are involved: S1. Cut the attached reinforcement according to the set length to obtain multiple steel bar segments, and weld and install the vibrating wire steel bar meter on two adjacent steel bar segments using a mounting rod; S2. Electrically connect the lead wire of the vibrating wire rebar meter to the shield wire, and install a sealing assembly; S3. After the steel cage is hoisted and lowered in sections, the auxiliary reinforcement with the vibrating wire steel gauge installed is welded to the main reinforcement of the steel cage; S4. Tie a steel wire on the end of the shielding wire away from the lead-out wire, and insert the steel wire into the PVC hose. Pull the steel wire through the electric reel to pull the shielding wire into the PVC hose, and then connect the shielding wire to the monitoring terminal.

7. The method for installing the automatic monitoring device for slope retaining pile stress according to claim 6 is characterized by: Step S2 specifically includes the following steps: S21, disconnect the core of the lead-out wire and the core of the shielding wire at different ends; S22, put an inner sealing sleeve on the outer side of the core of the lead-out wire or the core of the shielded wire, and put an intermediate sealing sleeve and an outer sealing sleeve on the lead-out wire and the shielded wire respectively; S23, aligning the offset positions of the cores of the lead-out wires and the cores of the shielding wires, performing offset welding, and after welding, pulling the inner sealing sleeve to the offset welding position so that the inner sealing sleeve covers the offset welding position, and heating the inner sealing sleeve from the middle to both ends so that the inner sealing sleeve shrinks to the outside of the offset welding position to achieve primary sealing; S24, pull the middle sealing sleeve to the outside of the inner sealing sleeve so that the middle sealing sleeve covers the inner sealing sleeve, and line the inner walls of both ends of the middle sealing sleeve with a circle of heat shrink film, heat the middle sealing sleeve from the middle to both ends, so that the middle sealing sleeve gradually shrinks from the middle to both ends, exhaust the air between the middle sealing sleeve and the inner sealing sleeve, the lead wire and the shielding wire, and melt the heat shrink film, and achieve secondary sealing after solidification; S25. Pull the outer sealing sleeve to the outside of the middle sealing sleeve so that the outer sealing sleeve covers the middle sealing sleeve, and line the inner walls of both ends of the outer sealing sleeve with a circle of heat shrink film, heat the outer sealing sleeve from the middle to both ends, so that the outer sealing sleeve gradually shrinks from the middle to both ends, exhaust the air between the outer sealing sleeve and the middle sealing sleeve, the lead wire and the shielding wire, melt the heat shrink film, and achieve three-level sealing after curing.

8. The method for installing the automatic monitoring device for slope retaining pile stress according to claim 7 is characterized in that: The inner sealing sleeve described in step S22 is a heat shrink tube with a length of 45 mm and an inner diameter of 3 mm; the middle sealing sleeve is a heat shrink tube with a length of 150 mm and an inner diameter of 12 mm; and the outer sealing sleeve is a heat shrink tube with a length of 200 mm and an inner diameter of 12 mm.

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