CN2751282Y

CN2751282Y - Steel plate strain meter

Info

Publication number: CN2751282Y
Application number: CN 200420055383
Authority: CN
Inventors: 周国玉
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-01
Filing date: 2004-12-01
Publication date: 2006-01-11
Anticipated expiration: 2014-12-01

Abstract

The utility model provides a steel plate strain meter, which is provided with a main body, wherein the middle part of which is a hollow pipe; both ends of the hollow pipe are respectively cavity bodies which protrudes from the hollow pipe. A clamping table is formed in a juncture position between the cavity bodies and the hollow pipe, and the end parts of the two cavity bodies are all provided with installation openings. A vertical pipe communicated with the hollow pipe is vertically extended out from one side of the middle part of the hollow pipe, and the upper part of the vertical pipe is provided with a wire outlet. Two string clamping columns are tightly arranged in the cavity bodies and respectively clamped on the clamping table; the external end of each string clamping column is arranged on the inside of the installation opening. Additionally, a steel string is penetrated in the hollow pipe; both ends of the steel string is tightly fixed on the string clamping columns through a fastening device. Sealing layers are arranged between the end parts of the string clamping columns and the installation opening; a sensor is sealed in the vertical pipe through sealing material, a gap is left between the end part of an iron core of the sensor and the steel string; an output signal wire is led out from the wire outlet above the vertical pipe. The utility model has the characteristics of stable and reliable output signals, simple structure, small volume, etc. and is not affected by the temperature and the moisture of environment.

Description

The steel plate strainometer

Technical field

The utility model relates to a kind of steel construction vibration survey device, specifically a kind of steel plate strainometer.

Background technology

For a long time, the steel of domestic underground works supports and steel construction uses the platinum resistance foil gauge to detect the loose rate of string wire, the platinum resistance foil gauge is relatively stricter to environment requirement, can not be moist, can not casting concrete, also be unsuitable for long-term observation, be subjected to the influence of weather, humiture and cable conductor, the error of measured value is too big, and this also is a difficult problem that troubles the civil engineering work expert for a long time.For example the tunnel, Dayao mountain in the Beijing-Kowloon Railway does not in time test out tunnel deformation owing to adopt traditional platinum resistance foil gauge, steel is supported effectively face control, makes Tunnel Landslide, brings about great losses to country.Vibrating wire strain gauge of the prior art, volume is bigger, thickness of pipe, therefore sensing range is less, also do not have special seal cavity, sealing effectiveness is poor, especially its Sensor section not sealing fully, because most of detecting instrument all is operated in the rugged environment, this sealing will cause the sensor cisco unity malfunction.

The utility model content

But the purpose of this utility model is to provide a kind of ambient temperature and humidity that is not subjected to influence the steel plate strainometer that long-term observation is used.

For achieving the above object, the technical solution adopted in the utility model is:

Comprise, one main body, its middle part is a hollow tube, the two ends of this hollow tube are respectively the cavity that protrudes hollow tube, the internal diameter of cavity is greater than hollow tube tube wall internal diameter, and the intersection with hollow tube in cavity forms a Ka Tai, and the end of two cavitys is equipped with installing port, one side vertically extends a standpipe that communicates with hollow tube at the hollow tube middle part, and riser upper has a line outlet; Two chord clamp studs, chord clamp stud closely are embedded at inside cavity, and are arranged in respectively on the Ka Tai of two inside cavity, and the outer end of chord clamp stud places the inboard of installing port; One string wire is placed through in the hollow tube, and two ends are tightened by device for fastening and are fixed on the chord clamp stud; Be provided with sealant in the chord clamp stud end between the installing port; One sensor is fixedly installed in the standpipe, and it is the flow direction iron core that has coil vertical with string wire, leaves the gap between core ends and the string wire, and the tap of coil is output signal line, and this output signal line is drawn from the line outlet of standpipe top; Sensor is located in the standpipe by the encapsulant envelope.

Described chord clamp stud, it is a cylinder, an end of cylinder has a boss; At the other end middle part of cylinder away from boss, be provided with a folder string seam along the column axis direction, folder string seam radially runs through cylinder; Offer a string wire hole from the boss outside along the axis direction at cylinder middle part, the string wire hole communicates with folder string seam; On folder string seam bottom and string wire hole intersection, cylinder, be provided with a convenient hole that processes that communicates with folder string seam and string wire hole perpendicular to the chord clamp stud axis direction.

The beneficial effects of the utility model are;

1. stable output signal, reliable is not subjected to environment temperature, humidity effect.The utility model detecting element adopts 40 chromium, test data is stable, and single unit system is in elastic tube, and through excellent sealing, make detection sensitivity not influenced by ambient temperature and humidity, the temperature range of use is-20～60C, and can use for a long time, unit provides first-hand authentic data for design and construction, has solved the difficult problem that underground steel construction can't be measured stress and deformation.

2. stable output signal, measurement range is big, and is highly sensitive.Maximum measurement range of the present utility model can reach 1000 microstrains, and its sensitivity is 1 microstrain, and after tested, comprehensive linear index of the present utility model reaches 1.4%, has improved 1.1 percentage points than the comprehensive linear index of old-fashioned string wire strainometer 2.5%.

3. simple in structure, volume is little.Total length of the present utility model only is 50mm or 75mm, and small volume and less weight is easy to Installation and Debugging.

4. be widely used.The utility model is suitable for building, the steel construction of tunnel, bridges and culverts, subterranean railway and other engineerings uses.

Description of drawings

Fig. 1 is the utility model overall construction drawing;

Fig. 2 is the utility model chord clamp stud structural representation;

Fig. 3 is the left view of Fig. 2.

Embodiment

The utility model comprises: a main body, its middle part is a hollow tube 8, the two ends of this hollow tube 8 are respectively the cavity 1 that protrudes hollow tube 8, the internal diameter of cavity 1 is greater than hollow tube 8 tube wall internal diameters, intersection with hollow tube 8 in cavity 1 forms a Ka Tai, the end of two cavitys 1 is equipped with installing port 4, and one side vertically extends a standpipe 13 that communicates with hollow tube 8 at hollow tube 8 middle parts, and standpipe 13 tops have a line outlet 14; Chord clamp stud 2, the size of chord clamp stud 2 can closely be embedded at cavity 1 inside just, and are arranged in respectively on the Ka Tai of two cavity 1 inside, and the sealing of two folder string seams 23 is relative, is hollow tube 8 between the sealing, and the outer end of chord clamp stud 2 places the inboard of installing port 4; One string wire 3 is placed through in the hollow tube 8, and two ends pass from the folder string of chord clamp stud 2 seam 23 and string wire hole 24, and tightens by device for fastening and to be fixed on the chord clamp stud 2; Between installing port 4, be provided with sealant in chord clamp stud 2 ends; One sensor, be fixedly installed in the standpipe 13, the iron core of sensor is positioned at top, string wire 3 middle parts, its iron core of having coil 65 vertical that be a flow direction with string wire 3, leave the gap between iron core 5 ends and the string wire 3, the tap of coil 6 is output signal line 12, and this output signal line 12 is drawn outside the main body from the line outlet 14 of standpipe 13 tops; Sensor is located in the standpipe 13 by the encapsulant envelope; Chord clamp stud 2 is a cylinder 21, and an end of cylinder 21 has a boss 22; At the other end middle part of cylinder 21 away from boss 22, be provided with a folder string seam 23 along cylinder 21 axis directions, folder string seam 23 radially runs through the cylinder 21 seam end degree of depth near cylinder 21 roots and can not make its root stitch the position that 23 depth directions rupture along this folder string under external force; Offer a string wire hole 24 from boss 22 outsides along the axis direction at cylinder 21 middle parts, string wire hole 24 degree of depth are to communicating with folder string seam with folder string seam dark intersection, the end; Stitch on 23 bottoms and string wire hole 24 intersections, the cylinder 21 at the folder string, be provided with a hole 25 that conveniently processes that communicates with folder string seam 23 and string wire hole 24 perpendicular to chord clamp stud 2 axis directions; The end of chord clamp stud 2 is provided with in-line groove or the cross groove that can conveniently install; Device for fastening is meant the tapped through hole that is provided with radially on the outer wall of cavity 1, a holding screw 9 is spun in this through hole, and the holding screw upper end is provided with encapsulant; A sheathed coil former 7 outside iron core 5, coil 6 is wound on the coil former 7; Be provided with a terminal block 10 on the top of line outlet 14 inboards, cell winding 6, the tap of coil 6 is connected to external wire by this terminal block 10, forms output signal line 12, and this terminal block 10 seals with sensor and places in the standpipe 13; Add a gland bonnet 11 in the top of line outlet 14; Hollow tube 8 is the steel elastic tube.

The utility model is designed to the type vibration wire structure, according to string wire vibrations strain principle, when being subjected to external force with its accompanying steel construction, Flexible pipe fitting does the time spent, have the flexible hollow tube of steel 8 inside fixedly the string wire length of degree of tightness trace will take place changes, the electric current that sends when detecting by the vibratory string frequency tester, the exciting solenoid, produce magnetic field, swash the loose rate of dialling string wire and measuring string wire by the resonant frequency of measuring string wire with solenoid, when steel plate strainometer pressurized, string wire is just loose, the frequency of cutting magnetic line is decay just, thereby the tension force of string wire and output frequency also just change, with the data after changing and the calibration scale coefficient calculations of dispatching from the factory, extrapolate the stressing conditions of steel plate strainometer with the anti-method that pushes away again, thereby reflect steel construction distortion situation.

The utility model welds two core shielded cables according to user's needs, and seals fluid sealant, dispatches from the factory after debugging, demarcation.During use, earlier the utility model is fixedly mounted on steel construction surface to be measured with glue or spot welding mode, its signal output part is connected on the connection terminal that secondary instrument is the vibratory string frequency tester through two core shielded cables, can come into operation after debugging normally.

Claims

1. steel plate strainometer is characterized in that: comprises,

One main body, its middle part is a hollow tube (8), the two ends of this hollow tube (8) are respectively the cavity (1) that protrudes hollow tube (8), the internal diameter of cavity (1) is greater than hollow tube (8) tube wall internal diameter, intersection with hollow tube (8) in cavity (1) forms Ka Tai, the end of two cavitys (1) is equipped with installing port (4), and one side vertically extends a standpipe (13) that communicates with hollow tube (8) at hollow tube (8) middle part, and standpipe (13) top has a line outlet (14);

Two chord clamp studs (2), chord clamp stud (2) closely are embedded at cavity (1) inside, and are arranged in respectively on the inner Ka Tai of two cavitys (1), and the outer end of chord clamp stud (2) places the inboard of installing port (4);

One string wire (3) is placed through in the hollow tube (8), and two ends are tightened by device for fastening and are fixed on the chord clamp stud (2); Between installing port (4), be provided with sealant in chord clamp stud (2) end;

One sensor, be fixedly installed in the standpipe (13), it is the flow direction iron core that has coil (6) (5) vertical with string wire (3), leave the gap between iron core (5) end and the string wire (3), the tap of coil (6) is output signal line (12), and this output signal line (12) is drawn from the line outlet (14) of standpipe (13) top; Sensor is located in the standpipe (13) by the encapsulant envelope.

2. according to the described steel plate strainometer of claim 1, it is characterized in that: described chord clamp stud (2), it is a cylinder (21), an end of cylinder (21) has a boss (22); At the other end middle part of cylinder (21) away from boss (22), be provided with a folder string seam (23) along cylinder (21) axis direction, folder string seam (23) radially runs through cylinder (21); Offer a string wire hole (24) from boss (22) outside along the axis direction at cylinder (21) middle part, string wire hole (24) communicate with folder string seam.

3. according to the described steel plate strainometer of claim 2, it is characterized in that: on folder string seam (23) bottom and string wire hole (24) intersection, cylinder (21), be provided with a convenient hole (25) that processes that communicates with folder string seam (23) and string wire hole (24) perpendicular to chord clamp stud (2) axis direction.

4. according to the described steel plate strainometer of claim 2, it is characterized in that: the end of described chord clamp stud (2) is provided with in-line groove or the cross groove that can conveniently install.

5. according to the described steel plate strainometer of claim 1, it is characterized in that: described device for fastening is meant the tapped through hole that is provided with radially on the outer wall of cavity (1), and a holding screw (9) is spun in this through hole.

6. according to the described steel plate strainometer of claim 1, it is characterized in that: a sheathed coil former (7) outside iron core (5), coil (6) is wound on the coil former (7).

7. according to the described steel plate strainometer of claim 1, it is characterized in that: top inboard at line outlet (14), coil (6) is provided with a terminal block (10), the tap of coil (6) is connected to external wire by this terminal block (10), form output signal line (12), this terminal block (10) seals with sensor and places in the standpipe (13).

8. according to claim 1 or 7 described steel plate strainometers, it is characterized in that: add a gland bonnet (11) in the top of outlet (14).

9. according to the described steel plate strainometer of claim 1, it is characterized in that: described hollow tube (8) is the steel elastic tube.