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CJY-7080 steel ruler

CJY 7080 steel ruler is simple in structure and easy to operate. This instrument is used with CJG-7086 PVC settlement pipe (sold separately), CJH-7080 settlement magnetic ring (sold separately) and bottom cover (sold separately) for soft soil foundation reinforcement, earth-rock dam, foundation pit excavation, backfill , Embankment and other projects.
CJY-7080 steel ruler
Overview CJY —7080 steel ruler is simple in structure and easy to operate. This instrument is used with CJG-7086 PVC settlement pipe (sold separately), CJH-7080 settlement magnetic ring (sold separately) and bottom cover (sold separately) for soft soil foundation reinforcement, earth-rock dam, foundation pit excavation, backfill , Embankment and other projects, measure the layered settlement or uplift of the soil, and also measure the horizontal (lateral) displacement of buildings such as dykes. This instrument can be used both during construction and long-term safety monitoring of dams and other buildings. Comply with technical specifications for earth-rock dam safety monitoring.
Main Specifications

Specifications 30 50 100 150
Measuring depth (m) 0 ~ 30 0 ~ 50 0 to 100 0 ~ 150
Minimum reading (㎜) 1
Repeatability error (㎜) ± 2.0
Instrument weight (㎏) 3.5 4.5 6.5 10
Working voltage (V) DC 9

Structural principle The measurement of settlement is composed of two parts: one is the underground buried part, which consists of the settlement duct, the bottom cover and the settlement magnetic ring; the second is the ground receiving instrument-steel ruler, which consists of a probe, a measuring cable, and a receiver. System and winding reel.
Probe part: made of stainless steel, with a magnetic field sensor installed inside. When it encounters an external magnetic field, it will turn on the receiving system. When the external magnetic field is not acting, it will automatically turn off the receiving system.
Measure the cable part; the plastic rule is combined by the steel ruler and the wire, which not only prevents the corrosion of the steel ruler, but also simplifies the operation process, and the reading is more convenient and accurate. One end of the steel ruler cable is connected to the probe and the other end Receiving system.
Receiving system: It consists of a horn and a peak indicator.The horn emits a continuous beeping sound. The bee value is indicated by the pointer of a voltmeter.The two can be selected by turning the switch. No matter what type of receiving system is used, the reading accuracy is Are consistent.
Winding disc part: It consists of winding disc and bracket. The receiving system and battery are all placed in the core cavity of the winding disc, and a steel rule cable is wound outside the cavity.
Settling pipe (sold separately): made of PVC engineering plastic (produced by our factory), including main pipe and connecting pipe. The connecting pipe is sleeved at the two main pipe joints and plays a role of connection and fixation.
Bottom cover (available separately): Made of injection molding (produced by our factory) and installed on the bottom and top of the sedimentation tube, which can effectively prevent sediment or foreign matter from falling into the tube, which affects the measurement.
Main technical parameters of CJG-7086 PVC sedimentation pipe

Specifications 53 70
Outer diameter (㎜) Φ53 Φ70
Inner diameter (㎜) Φ45 Φ60
Tube length ( m) 2 or 4
Curvature(%) ≤1.0
Out-of-roundness (㎜) ≤1.2

Settling magnetic ring:
Made of injection molding (available separately), with magnetic materials inside to form a magnetic ring, and spring leaves installed outside. The magnetic ring is sleeved outside the catheter, and the spring leaf contacts the soil layer and is displaced as the soil layer moves.

Type Specifications Remark
CJH—88.1 53 70 Mainly suitable for drilling installation
CJH—88.2 53 70 Mainly suitable for filling and installation

When measuring using the method, loosen the set screw on the back of the reel to allow the reel to turn freely, press the power button (the power indicator is on), put the probe into the catheter, hold the steel rule cable in The head moves slowly downwards. When the probe contacts the magnetic ring in the soil layer, the sound of the receiving system will emit continuous beeps. At this time, the depth of the steel rule cable at the mouth of the pipe is read and written. Measuring the bottom of the hole little by little in this way is called process reading, which is indicated by the letter Ji. When the measurement cable is retracted in the conduit, it can also receive the sound from the system's audio equipment through the magnetic ring in the soil layer. Sound, at this time, you must also read and write the depth of the measurement cable at the mouth of the pipe. If the hole is measured in this way, it is called backhaul reading, which is indicated by the letter Hi. The actual depth of each magnetic ring in the hole in the soil is written by the letter. Si said.
Its calculation formula is:
Si = (Ji + Hi) / 2
Where: i — the number of points measured in a hole, that is, the number of magnetic rings in the soil layer;
Si — the actual depth of the measuring point from the nozzle (㎜);
Ji — the depth of the i point from the nozzle during process reading (读);
Hi — the depth of the i point from the nozzle during backhaul reading (㎜);
If the beep sound is not audible when measuring in a relatively noisy environment, you can use the peak indicator instead, as long as the selector switch on the instrument panel is set to the voltage range, the measurement method is the same as above, the measurement accuracy and acoustic measurement at this time The resulting accuracy is the same.
Users must pay attention to when using:
a) When the probe enters the magnetic ring in the soil layer, the sounder will immediately make a sound or the voltmeter has an indication.At this time, the measurement cable should be slowly retracted and put in order to carefully find the exact location of the pronunciation or the indication moment Read the depth of the point from the nozzle.
b) The accuracy of the reading is determined by how to determine the starting position of the pronunciation or instruction. The accuracy of the measurement is related to the proficiency of the operator, so it should be repeated practice and operation.
c) When the settlement probe enters each magnetic ring, there are two beeps, but the first beep must be used as the standard, that is, the process is the first beep and the return is the first beep.
Maintenance is limited due to the limited battery capacity. Whenever the measurement is completed, the power switch should be turned off immediately. Don't forget! When replacing the battery, you must put down the steel rule cable from the winding reel and unscrew the two M4 cables on the front panel. Tap the screw and remove the front panel to replace the new battery.
After the measurement, the probe and the steel rule cable must be wiped clean, and the steel rule cable must be neatly wound on the disk, and then placed in the cabinet.
The probe is required to be sealed when working, and it is absolutely forbidden to disassemble to avoid damage.
When you find that the probe is faulty, you should immediately send it to our factory for repair.
Do not bend the measuring cable, especially near the end of the probe, to avoid damage and breakage.
The probe should be handled lightly and carefully, avoiding severe vibration.
Receiving and storing the instrument Within one year from the date of shipment, if the user complies with the rules for transportation, storage and use, if the product quality is found to be lower than the technical conditions, our factory will be responsible for repairing or replacing (after disassembly without authorization, I Factory does not repair).
The instrument should be stored in a dry and ventilated room with a non-corrosive gas at a temperature of -10 ° C to 40 ° C and a humidity of not more than 80%.
The installation method of layered settlement of soil is drilled with Φ108 drill bit. In order to put the pipe smoothly to the end, it generally needs to be deeper than the installation depth. Its principle is 10 meters + 0.5 meters, 20 meters + 1 meters, and so on. .
Clear the hole. After the drill bit is drilled to the predetermined position, do not lift the drill immediately. Connect the pump to the clear water and pour the clear water down until the muddy water becomes the mixed water. Then lift the drill and install it.
The connection of the installation pipe adopts an external joint, and the clean water is poured into the pipe while the pipe is lowered (when the buoyancy of the pipe is too large).
For the installation of the magnetic ring, put a magnetic ring and a positioning ring on each tube according to the design requirements, and fix the positioning ring with screws, and then insert the tube into the outer joint and tighten the screws, so that the edge is lowered to the design depth.
If the separation distance of the magnetic rings is not exactly 2 meters, it can be achieved by adjusting the length of the pipe, or by using a positioning ring on the pipe, but one principle must be mastered: the magnetic ring must have a sufficient settlement distance downward. Must meet its design requirements.
After the sedimentation tube is placed in the design requirements, the lid can be backfilled. The backfill material is dry fine soil or medium coarse sand on site. The backfill speed must not be too fast, so as not to backfill after clogging, which will form a gap. It is best to check it after a day or two, after the backfill sinks, After the backfill is completed, protective measures are added around the tube, so that you can rest assured to measure later.

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