Dynamic protection device for inclinometry-settlement monitoring pipe of concrete faced rockfill dam

Abstract

The utility model relates to the technical field of water conservancy monitoring, in particular to a dynamic protection device for an inclinometry-settlement monitoring pipe of a concrete faced rockfill dam, which is used for protecting a pipe body of the inclinometry-settlement monitoring pipe arranged on a dam body and comprises a protection barrel arranged outside the pipe body, fine aggregate is arranged in the protection barrel, and the pipe body is arranged in the fine aggregate. The protection barrel and the high-strength lifting rope are arranged to be linked with the mechanical traction device, and real-time elevation synchronous adjustment of the protection barrel along with layered filling of the dam body is achieved. The protection barrel can ensure that the top end of the protection pipe is always higher than a filling operation face so as to play a warning role, avoid pipe body deformation caused by rolling impact of a heavy vibration roller, reduce construction interruption time and remarkably improve filling continuity.

Description

TECHNICAL FIELD

[0001] The utility model relates to water conservancy monitoring technical field especially, it relates to a kind of faceplate rockfill dam inclinometer-sinking monitoring pipe dynamic protection device and construction method. BACKGROUND

[0002] In the filling construction of faceplate rockfill dam, inclinometer tube and sinking tube integrated monitoring facility is as the core carrier of deformation perception inside dam body, and it bears the collection task of multi-dimensional data such as horizontal displacement, vertical settlement and deflection deformation.

[0003] Current embedding technology is limited by traditional method limitations, and has problems such as insufficient dynamic adaptability of casing, insufficient reliability of filter backfill system, construction interference and work efficiency imbalance.

[0004] Specifically, the traditional rigid casing adopts fixed embedding scheme, and cannot realize synchronous lifting with dam body filling layer-by-layer rolling (each layer of paving thickness 0.8~1.2m). In the filling process, the casing is easy to be buried by upstream cushion material or downstream rockfill material, which causes the elevation of pipe opening to lag behind the construction surface, and the subsequent installation of pipe section is difficult. More seriously, when the excitation force of heavy vibration roller (such as 25t self-propelled roller) is transmitted to the casing which is not lifted in time, the casing flange is easy to be dislocated, and even the ovality of the casing body is distorted, which causes the inclinometer probe to be blocked, the settlement magnetic ring signal to be distorted and other problems.

[0005] In addition, according to the "ring layer backfill method" recommended in "Technical Code for Safety Monitoring of Earth and Rockfill Dams" (SL 551-2012), there are process control problems in actual operation. Especially at the junction between core wall area and transition material, the artificial backfilling of medium-coarse sand filter material is difficult to realize uniform compaction in ring direction, and the local porosity deviation exceeds 15%, which causes stress concentration around the pipe, induces casing shear failure in the dam body wetting deformation stage, forms seepage preferential channel, accelerates the corrosion of metal pipe wall and affects the coupling deformation of settlement ring and filler, and the grading control of filter layer causes fine particle migration, which causes the decoupling of deformation between inclinometer tube and dam body.

[0006] In addition, the existing "stage pre-embedding method" needs to pause construction after filling 3-5m each time, and then correct the verticality of casing (the inclination rate is required to be less than or equal to 0.3%), detect the interface sealing and detect the compaction degree of filter material (the dry density detected by ring knife method is greater than or equal to 2.15g / cm 3 ). Such frequent process insertion causes filling machinery to be forced to avoid operation, and the single cycle period is prolonged by 40%-60%; multiple types of cross operation increase the risk of pipe body collision, and statistics show that about 12% of monitoring pipes fail due to mechanical impact during construction period. UTILITY MODEL CONTENTS

[0007] Therefore, it is necessary to provide a dynamic protection device for the inclination-settlement monitoring pipe of a panel rockfill dam to address the above-mentioned technical problems.

[0008] The above objective is achieved through the following technical solution: a dynamic protection device for a tilt-settlement monitoring pipe of a rockfill dam, used to protect the pipe body of the tilt-settlement monitoring pipe installed on the dam body, including a protective cylinder installed outside the pipe body, the protective cylinder containing fine aggregate, and the pipe body being installed in the fine aggregate.

[0009] Furthermore, the protective cylinder is equipped with positioning ears. After the dam filling is completed, the positioning ears can serve as anchor points for the horizontal dam surface.

[0010] Furthermore, the positioning ear is equipped with a detachable lifting rope. This allows the positioning ear to serve as a fixing point for the lifting rope during the dam filling period, facilitating the lifting of the protective cylinder.

[0011] Furthermore, a transition tube is provided at the top of the protective cylinder. The transition tube can be threaded into the protective cylinder to serve to tighten the cylinder body.

[0012] Furthermore, a concrete platform is provided on the outer periphery of the protective cylinder and the transition pipe.

[0013] As a preferred embodiment, the bottom of the pipe body is provided with a pipe seat, and the pipe seat is located at the bottom of the dam body.

[0014] As a preferred embodiment, the bottom of the dam body is provided with a foundation pit, the pipe seat is set in the foundation pit, and the foundation pit is filled with fine aggregate.

[0015] As a preferred embodiment, the top of the transition pipe is provided with a detachable cover, which is positioned above the concrete platform for easy opening during monitoring.

[0016] The beneficial effects of this utility model are:

[0017] By linking a protective cylinder and a high-strength lifting rope with a mechanical traction device, the real-time elevation of the protective cylinder is synchronously adjusted as the dam body is layered during filling. This protective cylinder ensures that the top of the protective pipe is always higher than the filling working surface, serving as a warning, preventing pipe deformation caused by the impact of heavy vibratory rollers, reducing construction interruption time, and significantly improving filling continuity. A fine aggregate layered backfilling process is adopted, with coarse particles removed by manual sieving and directional compaction to form a uniform and dense circumferential shear and compressive resistant protective layer. This structure effectively disperses external load stress, reducing the risk of shear damage to the monitoring pipe from impact loads during the filling period. Settlement magnetic rings are fitted onto the outer wall of the inclinometer tube at preset intervals, using a magnetic pole directional installation and synchronous consolidation process with backfill material preparation to ensure complete coupling between the magnetic rings and the deformation of the filling layer. This design eliminates the defects of magnet detachment or displacement lag on the magnetic rings in traditional processes, reducing the deviation rate of horizontal displacement and settlement monitoring data and improving measurement accuracy. This device is both resistant to environmental erosion and reusable, reducing the consumption rate of construction materials. A reinforced concrete platform is poured around the protective cylinder, using impermeable concrete to effectively resist rainwater erosion, freeze-thaw cycles, and chemical corrosion, extending the service life of the monitoring facilities. A detachable threaded transition pipe enables rapid integration of the protective cylinder and the top cover after filling. The transition pipe adopts a pressure-resistant design with tapered or variable diameter pipes, forming a multi-level protection system in conjunction with the cast-in-place concrete platform. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the usage state of this utility model;

[0019] Fig. 2 This is a schematic diagram of the protective cylinder of this utility model after the filling is completed;

[0020] Fig. 3 This is a schematic diagram of the protective cylinder of this utility model during the filling period.

[0021] The components include: dam body 1, pipe body 2, protective cylinder 3, fine aggregate 4, positioning lugs 5, lifting rope 6, transition pipe 7, concrete platform 8, pipe base 9, foundation pit 10, and top cover 11. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] like Figs. 1 to 3As shown, this utility model provides a dynamic protective device for a tilt-settlement monitoring pipe of a rockfill dam, used to protect the pipe body 2 of the tilt-settlement monitoring pipe installed on the dam body 1. It includes a protective cylinder 3 installed outside the pipe body 2, with fine aggregate 4 inside the protective cylinder 3, and the pipe body 2 nested within the fine aggregate 4. The protective cylinder 3 has positioning ears 5. After the dam filling is completed, the positioning ears 5 can serve as anchor points for the horizontal dam face. The positioning ears 5 are equipped with a detachable lifting rope 6. Thus, during the dam filling period, the positioning ears 5 can serve as a fixing part for the lifting rope 6, facilitating the lifting of the protective cylinder 3. The top of the protective cylinder 3 has a transition pipe 7. The transition pipe 7 can be threadedly connected to the protective cylinder 3 to tighten the cylinder body. A concrete platform 8 is provided around the outer periphery of the protective cylinder 3 and the transition pipe 7. A pipe seat 9 is provided at the bottom of the pipe body 2, and the pipe seat 9 is located at the bottom of the dam body 1. The dam body 1 has a foundation pit 10 at its bottom, and the pipe seat 9 is located inside the foundation pit 10, which is filled with fine aggregate 4. The transition pipe 7 has a detachable top cover 11 on top, which is located above the concrete platform 8 and can be opened for easy monitoring.

[0024] In practical application, this utility model proposes a dynamic collaborative protection method for inclination-settlement monitoring pipes in conjunction with the device: a foundation pit 10 is opened on the dam body 1 before filling, and the inclination-settlement monitoring pipe body 2 is vertically installed on the pipe seat 9 in the foundation pit 10. During the filling period, it is raised section by section as the dam body 1 is filled. A detachable sealing cap is set at the top of each section of the pipe body 2, such as tightly wrapped with tape, to prevent the filling material from entering the pipe body 2 during the filling period; a protective sleeve 3 is fitted around the outer periphery of the pipe body 2, and two symmetrical positioning ears 5 are welded on the outside of the protective sleeve. Two steel wire lifting ropes 6 are passed through the symmetrical positioning ears 5 respectively. The lifting ropes 6 are tied and fixed above the protective sleeve 3. The knot is connected to a mechanical traction device, and the protective sleeve 3 can be vertically lifted by the lifting ropes 6.

[0025] During the filling period, as the dam body 1 is filled and raised section by section, the protective cylinder 3 is vertically lifted daily using a mechanical traction device and lifting rope 6. The fine aggregate 4, which is the initial filter material for dam filling, is then backfilled into the space between the protective cylinder and the pipe body 2 and manually compacted. When settlement magnetic rings are required, they are placed inside the fine aggregate 4 outside the pipe body 2, with a spacing of 4m between the settlement magnetic rings on the pipe body 2 (refer to design parameters). The rings are then buried and compacted within the fine aggregate 4 in the protective cylinder 3. The side of the settlement magnetic ring with the magnet hole should be installed facing upwards to prevent the magnet from being squeezed and falling into the backfilled fine aggregate 4. When a second section of the pipe body 2 needs to be added, the sealing cap is removed, and the ring is then... An expansion joint (ring-shaped connecting pipe) connects the upper and lower sections of pipe body 2. The inner diameter of the ring-shaped connecting pipe is slightly larger than that of pipe body 2, and the two sections of pipe body 2 are connected and fixed with screws. The ring-shaped connecting pipe (expansion joint) is a sleeve about 20cm long. When the protective cylinder 3 is raised to the top of the previous pipe body 2, it is fixed to the bottom of the new pipe body 2 with two layers of four screws each to form a connection. After the connection is completed, first wrap it with self-adhesive tape, then wrap geotextile around the connection of pipe body 2, and finally tighten the geotextile with electrical tape. The geotextile serves to isolate the fine aggregate 4 filling material inside the pipe body 2 from the fine aggregate 4 filling material inside the protective cylinder 3, preventing the fine aggregate 4 filling material from entering the pipe body 2 through the gaps in the connecting pipe. When the protective cylinder 3 is raised and the fine aggregate 4 is backfilled each day, the opening of the pipe body 2 should be temporarily sealed with a removable sealing cap.

[0026] After the dam filling is completed, a transition pipe 7 is threadedly connected above the protective cylinder 3. The transition pipe 7 is a tapered pipe from bottom to top or a reducing pipe with a smaller diameter at the top and a larger diameter at the bottom. The transition pipe 7 is threadedly connected to the top of the protective cylinder 3 to tighten the cylinder body. The top of the transition pipe 7 is threadedly connected to an openable cover 11, which can be opened and closed as needed during later monitoring. After the protective cylinder 3, transition pipe 7, and cover 11 are installed, a concrete platform 8 is poured outside the protective cylinder 3 and transition pipe 7, using the positioning ears 5 on both sides of the protective cylinder 3 as horizontal dam surface anchor points. The concrete platform 8 should be higher than the protective cylinder 3, and the top of the transition pipe 7 should be higher than the pipe body 2 by a certain height.

[0027] The protective cylinder 3 has a height of 1.5m, a diameter of 50cm, and a wall thickness of 5mm. A pre-threaded end is pre-installed at the top for later connection to the transition pipe 7. Horizontal positioning ears 5 are welded at the same height on both sides of the cylinder's middle section. These positioning ears 5 serve as construction anchor points. During the filling period, construction workers can visually adjust the height of the protective cylinder 3 based on the anchor points. The lifting rope 6 passes through the rings of the positioning ears 5 on both sides and is knotted at the top. The resulting wire rope knot connects to the mechanical traction equipment and vertically and dynamically lifts the protective cylinder 3 according to the construction filling progress (approximately 0.8 meters per day). This structure is the segmented steel protective pipe external ring anchoring structure.

[0028] Fine aggregate 4 filling material should be backfilled in layers by hand after removing large aggregates with a diameter greater than 10cm. The aggregate should be vibrated to reduce voids and improve compaction, forming a uniform and dense circumferential shear and compressive protective layer.

[0029] The transition pipe 7 is only brought to the site during the final stage after the dam filling is completed and the pipe body 2 is installed. It is used in conjunction with the top cover 11, and the two are also connected to each other by threads. The outer surfaces of the transition pipe 7 and the top cover 11 should be treated with rust prevention and painted with red paint.

[0030] The starting point of the concrete abutment 8 should be flush with the lower end of the protective casing 3. Simultaneously, the positioning lugs on the outside of the protective casing 3 should be flush with the dam surface to serve as horizontal reference anchor points. The diameter of the concrete abutment 8 should be significantly larger than the diameter of the protective casing 3, and the height of the concrete abutment 8 should extend a certain distance beyond the narrow section of the transition pipe 7. After the concrete abutment 8 is poured, cement mortar should be used to fill the gap between the pipe body 2 and the protective casing 3 until it reaches the same height as the concrete abutment 8, and then vibrated to remove air bubbles.

[0031] This utility model, through four core installation and protection modules—dynamic elevation adaptation, reverse filter compaction control, magnetic ring coupling installation, and modular protection—aims to improve the integrity rate of inclinometers during construction, increase filling efficiency, and ensure that the reliability of monitoring data meets the first-level accuracy requirements of the "Code for Safety Monitoring of Earth-Rock Dams." It is applicable to the full life-cycle safety monitoring of high-fill-strength concrete rockfill dam projects.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

[0034] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A dynamic protection device for inclinometer-settlement monitoring pipe of a face rockfill dam, used for protecting the inclinometer-settlement monitoring pipe body (2) arranged on the dam body (1), characterized in that, Including the protection cylinder (3) set in the pipe body (2) outside, the protection cylinder (3) is equipped with fine aggregate (4) inside, the pipe body (2) is arranged in fine aggregate (4).

2. The dynamic protection device for inclinometer-settlement monitoring pipe of face rockfill dam according to claim 1, characterized in that, The protection cylinder (3) is equipped with positioning lug (5).

3. The dynamic protection device for inclinometer-settlement monitoring pipe of face rockfill dam according to claim 2, characterized in that, The positioning lug (5) is equipped with detachable pull rope (6).

4. The dynamic protection device for inclinometer-settlement monitoring pipe of face rockfill dam according to claim 3, characterized in that, The protection cylinder (3) top is equipped with transition pipe (7).

5. The dynamic protection device for inclinometer-settlement monitoring pipe of face rockfill dam according to claim 4, characterized in that, The protection cylinder (3) and transition pipe (7) periphery are equipped with concrete pedestal (8).

6. The dynamic protection device for incline-settlement monitoring pipe of face rockfill dam according to any one of claims 1-5, characterized in that, The pipe body (2) bottom is equipped with pipe seat (9), the pipe seat (9) is arranged in dam body (1) bottom.

7. The dynamic protection device of inclinometer-settlement monitoring pipe of face rockfill dam according to claim 6, characterized in that, The dam body (1) bottom is equipped with foundation pit (10), the pipe seat (9) is arranged in foundation pit (10), and the foundation pit (10) is filled with fine aggregate (4).

8. The dynamic protection device for inclinometer-settlement monitoring pipe of face rockfill dam according to claim 4 or 5, characterized in that, The transition pipe (7) top is equipped with detachable upper cover (11), the upper cover (11) is arranged above concrete pedestal (8), and is opened conveniently when monitoring.

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