CN209114288U - Roadbed interior laminate layer deforms real-time monitoring system - Google Patents

Abstract

The present disclosure discloses a real-time monitoring system and an installation method for the inner layered deformation of a roadbed, including a settlement cap, a surface protection cover, a settlement plate, a hose, a carbon fiber rod, a snap ring base, a wire and a displacement sensor. The upper end of the settlement cap is provided with The surface protective cover is connected to the settlement plate at the lower end. Several displacement sensors are arranged on the settlement plate, and the probe of the displacement sensor extends out of the settlement cap. The lower end of the carbon fiber rod is connected with a plurality of carbon fiber rods, the carbon fiber rods are arranged side by side, and the length increases in turn, and the bottom end of the longest carbon fiber rod is connected to the anchoring end set in the subgrade drill hole by means of threads, and the carbon fiber rods are spaced. a ring base, and a corrugated pipe is arranged between the snap ring bases to accommodate the carbon fiber rod. The present disclosure can measure soil stiffness at multiple depths, reducing the time and cost of measurement.

Description

Real-time monitoring system for inner layered deformation of subgrade

technical field

The present disclosure relates to a real-time monitoring system for inner layered deformation of roadbed.

Background technique

At present, the main in-situ test method for measuring the internal displacement of the soil body is to anchor a circular settlement tube to the bedrock, wrap the magnetic ring around the settlement tube, and bury it at each observation level. When the soil is displaced, the magnetic ring can move with the soil without the settlement tube sinking, and the magnetic ring moves along the axis of the settlement tube. The purpose of measurement is achieved by measuring the relative slip between the magnetic ring and the settlement tube.

This method has the following disadvantages: 1. The buried position of the settlement tube cannot be compacted, and the properties of the soil near the settlement tube and the soil far away from the settlement tube are different, resulting in measurement errors; The position of the magnetic ring can only be measured by putting down the magnetic probe, which can only be measured manually, which has poor accuracy, heavy workload and low efficiency.

The requirements for the determination of soil stiffness include (1) the pre-stressed soil surface and (2) the measurement of the vertical deformation of the soil. The current problem is that in the absence of instruments capable of acquiring actual stiffness data of in situ soil conditions at various depths, to obtain the data required for the definition and assessment of existing soil conditions, to properly determine the existing Carrying capacity.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present disclosure proposes a real-time monitoring system for layered deformation inside a subgrade. The present disclosure can measure soil stiffness at multiple depths and provide fast and accurate continuous measurement through an automatic pairing system to reduce measurement time and cost.

In order to achieve the above object, the present disclosure adopts the following technical solutions:

A real-time monitoring system for inner layered deformation of roadbed, comprising a settlement cap, a surface protection cover, a settlement plate, a hose, a carbon fiber rod, a snap ring base, a wire and a displacement sensor, wherein:

The upper end of the settling cap is provided with a surface protection cover, and the lower end is connected to the settling plate, a number of displacement sensors are arranged on the settling plate, and the probes of the displacement sensors extend out of the settling cap, and the wires of the displacement sensor extend from the flange of the settling cap. lead out, the wire jacket has a hose;

The lower end of the displacement sensor is connected with a plurality of carbon fiber rods, the carbon fiber rods are arranged side by side, and the lengths increase in turn, the carbon fiber rods are provided with snap ring bases at intervals, and bellows are arranged between the snap ring bases to accommodate The carbon fiber rod.

As a further limitation, the surface protection cover is connected to the settlement cap with bolts, the settlement plate is glued to the bottom of the settlement cap, and the displacement sensor is glued to the settlement plate.

As a further limitation, the flange and the bottom of the settling cap are provided with drilled holes, and the settling plate is provided with corresponding holes.

As a further limitation, the carbon fiber rod and the displacement sensor are connected by thread, the bottom end of the carbon fiber rod and the snap ring base are connected by thread, and the bottom end of the longest carbon fiber rod is connected on the anchor end by thread.

As a further limitation, the displacement sensor is an LVDT displacement sensor, and the probe of the LVDT displacement sensor is provided with a spring outside, and the bottom end of the probe is provided with an external thread.

As a further limitation, the snap ring base is composed of an upper and a lower part, a steel ball with an outer rubber is sandwiched between them, and the snap ring base is provided with at least one hole with an internal thread and several holes with a diameter larger than that of the carbon fiber rod. .

As a further limitation, the top of the anchoring end has a hole with an internal thread for connecting with the corresponding carbon fiber rod.

As a further limitation, the snap ring base and the external medium move vertically together, the movement of the snap ring base drives the carbon fiber rod to perform corresponding vertical movement, and the movement of the carbon fiber rod is received by the displacement sensor on the upper part.

As a further limitation, the lengths of the carbon fiber rods are different, and the lengths are adapted to the depth of each layer of subgrade soil, and each snap ring base is correspondingly arranged at the end of each carbon fiber rod, and its corresponding carbon fiber rod is fixed. , and set them one by one in the order starting from the bottom layer to ensure that each snap ring base is at the junction of the two subgrade soil layers.

The installation method of the above monitoring system includes the following steps: placing the monitoring system in a pre-drilled hole, after reaching a preset depth, fixing the anchoring end, tightening the carbon fiber rod in turn, and extruding the steel ball in the snap ring base , so that the snap ring base is fixed in the corrugated pipe, and the gap between the corrugated pipe and the hole wall is filled by pouring flexible polyurethane foam material, so that the corrugated pipe and the soil form a whole, and the vertical displacement is carried out together; The probe of the displacement sensor passes through the holes reserved in the settlement plate and the settlement cap, the settlement cap is fixed in the soil, the probe of the displacement sensor is tightened with the upper end of the carbon fiber rod, the displacement sensor is glued on the settlement plate, and the wire jacket of the displacement sensor is Put on the hose, and pass it through the reserved hole in the flange to connect with the external receiving device, and the surface protection cover is fixed on the settlement cap.

Compared with the prior art, the beneficial effects of the present disclosure are:

1. The present disclosure is applied to field testing, and solves the problem that the internal displacement of soil cannot be easily tested. The present disclosure can intuitively, accurately and effectively test the displacement of each soil layer inside the soil body.

2. The displacement sensor of the present disclosure adopts a detachable form and is placed in a head structure, which can be opened from the surface so that the sensor can be easily put in and taken out. Fixed at the corresponding position of each soil layer.

Description of drawings

The accompanying drawings that form a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute improper limitations on the present application.

FIG. 1 is a front view of the present disclosure.

FIG. 2 is a front view of the structure inside the settling cap.

Figure 3 is a front view of the connection between the LVDT displacement sensor probe and the carbon fiber rod.

Figure 4 is a front view at the base of a snap ring.

Among them, 1. Settling cap, 2. Surface protection cover, 3. Settling plate, 4. Corrugated hose, 5. Slim carbon fiber rod, 6. Snap ring base, 7. Conductor, 8. Hose, 9, LVDT Displacement sensor, 10. Anchoring end.

Detailed ways:

The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

In this disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only a relational word determined for the convenience of describing the structural relationship of each component or element of the present disclosure, and does not specifically refer to any component or element in the present disclosure, and should not be construed as a reference to the present disclosure. public restrictions.

In the present disclosure, terms such as "fixed connection", "connected", "connected", etc. should be understood in a broad sense, indicating that it may be a fixed connection, an integral connection or a detachable connection; it may be directly connected, or through an intermediate connection. media are indirectly connected. For the relevant scientific research or technical personnel in the field, the specific meanings of the above terms in the present disclosure can be determined according to specific situations, and should not be construed as limitations on the present disclosure.

As shown in Figure 1, a hole is drilled in the soil, the system is placed in the hole, the elongated carbon fiber rod 5, which extends down through the snap ring base retainer 6, to the bottom anchor end 10, the anchor end 10 Hydraulic anchors are used. The anchoring end 10 is connected with the bellows 4 through a snap ring or a mechanical connecting element, and the anchoring end 10 is usually fixed 2-3 meters below the road surface. After the anchoring ends are fixed, the anchors are embedded in the roadbed, and after the anchors 10 become sufficiently long and wide after expansion, the system can be fixed at its installation position, that is, the only movement allowed by the measurement system is longitudinal movement. The device is extended to pass through the pavement surface layer, the pavement base layer and the subgrade, and is connected with the anchoring end 10 . The settling cap 1 is placed on top of the slender carbon fiber rod 5 and connected with screws or other mechanical components, and each LVDT displacement sensor 9 in the settling cap is in contact with the lower slender carbon fiber rod 5 . Make the top of the settlement cap 1 flush with the road surface. The settlement cap 1 contains the LVDT displacement sensor 9 and the settlement plate 3. Use the wire 7 to make it pass through the road surface and connect to the data acquisition system. The wire 7 is covered with a hose 8 (not shown in the figure) to maintain its normal use and protection from the external environment. The settlement cap 1 adopts a cube with a side length of 10 cm, and the surface protection cover 2 adopts a detachable device to facilitate the maintenance and repair of the components in the box.

As shown in FIG. 2 , several snap ring bases 6 are arranged in the corrugated hose 4 to maintain the stability of the carbon fiber rod and reduce the consumption of the carbon fiber rod to reduce the cost. As shown in the snap ring base as shown in Figure 4, the carbon fiber rod for measuring the displacement of this layer is fixed on the snap ring base 6 by means of screws, and the upper end thereof is connected to the corresponding LVDT displacement sensor probe. There should be two remaining holes on the base of the snap ring on this layer, and the hole diameter should be slightly larger than the diameter of the carbon fiber rod 5, so that the other two carbon fiber rods can pass through the snap ring normally without being affected by it. It is the rod corresponding to the lowest subgrade and the rod corresponding to the anchoring end. All snap ring bases are similarly fastened to their corresponding rods.

According to the data measured by drilling and coring, the depth of each layer of subgrade soil is determined, and carbon fiber rods 5 of corresponding lengths are made respectively. Fix each snap ring base 6 and its corresponding carbon fiber rod 5 , and put them in one by one in the order starting from the bottom layer, so that the inserted rods pass through the holes reserved on the snap ring base 6 . After all the carbon fiber poles 5 are placed, the snap ring base 6 is at the junction of the two subgrade soil layers. As shown in Figure 4, after the rod is tightened, the rubber-wrapped steel ball in the middle of the snap ring base will be extruded to move out and engage with the inner wall of the bellows 4, and the snap ring base 6 will be Fixed on the bellows 4. After the installation is completed, the annular gap between the corrugated hose 4 and the drilled hole is filled with cement mortar. In this way, the inner snap ring base 6 and the external medium can move vertically together, and the movement of the snap ring base 6 will drive the carbon fiber rod 5 to make a corresponding vertical movement, and the movement of the carbon fiber rod 5 will be affected by its upper part. The LVDT displacement sensor 9 is received and transmitted to the external display through the wire 7. Therefore, by adopting the monitoring system, the settlement status of each layer of the roadbed can be conveniently monitored in real time.

For this monitoring system, pay attention to the following points. In order to ensure the stability of the corrugated hose 4 and save the filling material, the hole diameter to be drilled should be only slightly larger than the outer diameter of the corrugated hose 4 . The hose must be flexible longitudinally to follow the vertical displacement of the external medium. But in other directions, the corrugated hose 4 must be rigid enough to resist the pressure from the compacted soil. In order to ensure that the displacement of the carbon fiber rod 5 is not affected by other environmental factors such as moisture, the corrugated hose 4 must have good waterproof performance. The carbon fiber material has sufficient rigidity and stability, and can meet the requirements of accurately reflecting the vertical displacement of the external medium during the service life of the monitoring system.

The present disclosure has no electrical components in series, and each set of displacement sensors, rods, rings, anchors is a combination of individual components that do not interact with each other. If one group of components fails for some reason, only the measured value at the depth corresponding to that group will be lost, and the measured data of other groups will not be affected. In this device, relatively simple mechanical parts are installed in inaccessible underground locations, and precise electrical parts are placed in the settlement cap 1 which is convenient for maintenance. If there is a problem with the LVDT displacement sensor or the wire 7, it is only necessary to open the surface protection cover 2 located at the road surface, and then maintenance or replacement can be carried out.

Most of the components of this monitoring system are prefabricated components, so the on-site installation is very simple. Each carbon fiber rod 5 can be passed through the snap ring base 6 one by one in advance, and then the settlement cap can be installed on the top of the carbon fiber rod 5. After the installation is completed, the whole monitoring system can be pulled to the construction site. On-site construction only needs to carry out the following three steps: (1) Drill holes with sufficient depth and diameter. (2) Lower the monitoring system as a whole into the hole. (3) Fill the gap between the corrugated hose and the hole wall. This simple and fast installation method can reduce the number of installers and installation time required, and the entire on-site installation process can be completed in three hours or less. This simple and fast installation process has significant effects in terms of cost savings and ease of construction. If the installed road surface is an airport runway, a highway or an urban arterial road, etc., the problems caused by the long-term closure are obvious.

The monitoring system can install a large number of LVDT displacement sensors, carbon fiber rods, etc. inside, so it can measure the settlement changes at various depths, only need to increase the components and increase the diameter of the borehole. The present disclosure provides a fast and automatic method for measuring subgrade settlement, reduces the time and cost of measurement, and can automatically record and store data.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Although the specific embodiments of the present disclosure have been described above in conjunction with the accompanying drawings, they do not limit the protection scope of the present disclosure. Those skilled in the art should understand that on the basis of the technical solutions of the present disclosure, those skilled in the art do not need to pay creative efforts. Various modifications or variations that can be made are still within the protection scope of the present disclosure.

Claims (9)

1. a real-time monitoring system for layered deformation inside roadbed, it is characterized in that: comprise settlement cap, surface protection cover, settlement plate, hose, carbon fiber rod, snap ring base, wire and displacement sensor, wherein: The upper end of the settling cap is provided with a surface protection cover, and the lower end is connected to the settling plate, a number of displacement sensors are arranged on the settling plate, and the probes of the displacement sensors extend out of the settling cap, and the wires of the displacement sensor extend from the flange of the settling cap. lead out, the wire jacket has a hose; The lower end of the displacement sensor is connected with a plurality of carbon fiber rods, the carbon fiber rods are arranged side by side, and the lengths increase in turn, and the bottom end of the longest carbon fiber rod is connected to the anchoring end set in the roadbed bore hole by means of threads. A snap ring base is arranged on the rod at intervals, and a bellows is arranged between the snap ring bases to accommodate the carbon fiber rod. 2. A real-time monitoring system for inner layered deformation of roadbed as claimed in claim 1, characterized in that: the surface protection cover is bolted on the settlement cap, the settlement plate is glued at the bottom of the settlement cap, and the displacement sensor is glued at the settlement board. 3. a kind of real-time monitoring system of layered deformation inside roadbed as claimed in claim 1, it is characterized in that: the flange and bottom of described settlement cap are all provided with drilling holes, the bottom of settlement cap is cemented with settlement plate, settlement plate Corresponding holes are provided. 4. A real-time monitoring system for inner layered deformation of roadbed as claimed in claim 1, characterized in that: the carbon fiber rod is connected with the displacement sensor in a threaded manner, and the bottom end of the carbon fiber rod is connected with the snap ring base by a threaded manner , the bottom end of the longest carbon fiber rod is threaded on the anchor end. 5 . The real-time monitoring system for internal layered deformation of roadbed according to claim 1 , wherein the probe of the displacement sensor is provided with a spring outside, and the bottom end of the probe is provided with an external thread. 6 . 6. The real-time monitoring system for layered deformation inside a roadbed as claimed in claim 1, wherein the snap ring base is made up of upper and lower parts, wherein the steel ball of outer rubber is sandwiched between the snap ring base and the snap ring base. At least one hole with internal thread and a plurality of holes with a hole diameter larger than that of the carbon fiber rod are arranged on it. 7 . The real-time monitoring system for inner layered deformation of roadbed according to claim 1 , wherein the top of the anchoring end has a hole with an internal thread to connect with the corresponding carbon fiber rod. 8 . 8. The real-time monitoring system for layered deformation inside a roadbed as claimed in claim 1, wherein the snap ring base and the external medium move vertically together, and the motion of the snap ring base drives the carbon fiber rod to do corresponding Vertical movement, the movement of the carbon fiber rod is picked up by a displacement sensor on its upper part. 9. A real-time monitoring system for inner layered deformation of roadbed as claimed in claim 1, characterized in that: the lengths of the carbon fiber rods are different, and the lengths are adapted to the depth of each layer of the roadbed soil, and each snap ring The base is correspondingly arranged at the end of each carbon fiber rod, and is fixed to the corresponding carbon fiber rod.