CN201152841Y

CN201152841Y - Full-automatic monkey hammer type benkelman beams deflectometer

Info

Publication number: CN201152841Y
Application number: CNU2007201909074U
Authority: CN
Inventors: 吴永红; 印朝辉; 王兵; 李桂秋
Original assignee: Beijing Aerospace Institute for Metrology and Measurement Technology
Current assignee: Beijing Aerospace Institute for Metrology and Measurement Technology
Priority date: 2007-12-27
Filing date: 2007-12-27
Publication date: 2008-11-19
Anticipated expiration: 2017-12-27

Abstract

The utility model discloses a fully-automatic drop hammer deflectometer, which mainly comprises a loading device, a drop hammer lifting and releasing device, and a loading device lifting mechanism. The drop hammer lifting and releasing device consists of an electromagnet (1), a beam (2), two guide rails (3) and two electric push poles (4), wherein, the electromagnet (1) is arranged at the central part of the beam (2); two ends of the beam (2) are connected with the two guide rails (3) and can move along the guide rails (3) up and down; the two electric push poles (4) are arranged at two sides of the beam (2). Due to the drop hammer lifting and releasing device and adoption of the combination of the electric push poles and the electromagnet, the fully-automatic drop hammer deflectometer has simplified structure and convenient maintenance. The loading plate in the loading device adopts the universal joint technology, thus automatic leveling can be conveniently realized, and the accuracy of measuring data is improved. The fully-automatic drop hammer deflectometer can be applied to bearing capacity test of road and airport road surface deflection measurement foundation.

Description

Full-automatic Falling Weight Deflectometer

Technical field

The utility model relates to the ground loading detection technique field in industry and the covil construction, particularly a kind of full-automatic Falling Weight Deflectometer that is used for the pavement deflection measurement.

Background technology

Recent two decades comes, and Dynamic Non-Destruction Measurement research and development in road surface is subjected to increasingly extensive attention at home and abroad.Flexure is as most important pavement structure status evaluation index, and its measuring equipment and analytical technology development are very fast.Since nineteen fifty-three invention beam type benkelman beams deflectometer, the pavement deflection checkout equipment has developed into the Falling Weight Deflectometer (FWD) of simulation driving loading from the static(al) benkelman beams deflectometer, develop into the test of road pavement deflection basin from the maximum deflection test of single-point, and will be confined to flexure concept development on the flexible pavement meaning among the structure evaluation and design analysis of rigid pavement.The sixties in 20th century, France at first proposes the preliminary imagination of drop hammer type Dyna-Flex machine, the later stage seventies Denmark and Sweden at first be developed into FWD, since the eighties, FWD has obtained increasingly extensive application at home and abroad.

Falling Weight Deflectometer, comprise bogey, drop hammer lifting and releasing means, loading plate lifting gear, control system and measuring system form, can the simulating actual conditions road pavement apply dynamic load, measure the multiple spot flexure exactly, be fit to long distance, METHOD FOR CONTINUOUS DETERMINATION.Its ultimate principle is that the weight by certain mass freely falls loading plate with certain rigidity of hammering and acts on the road surface, then by force transducer and the displacement transducer of arranging at a certain distance measure suffered impulsive force and the deformation response of road table, i.e. deflection basin.Thereby can be according to the modulus of these each layers of data inverse pavement structure, as the foundation of road pavement bulk strength evaluation.Hammer-falling deflectometer is safe in utilization, test fast, save manpower, contain much information, measurement result is more accurate.Simultaneously, along with the development of measuring technique and Computer Control Technology, the measurement of hammer-falling deflectometer and control have been realized automatically.

At present, the lifting of dropping hammer of full-automatic Falling Weight Deflectometer both at home and abroad mainly adopts hydraulic means to realize with releasing means, promote by hydraulic cylinder and drop hammer and bogey, but complicated operation is difficult in maintenance.Loading plate partly is generally the pintongs structure, connection fixed to one another, but this structure does not have the levelling function, has influenced data stability; Loading plate also has the levelling of the hydraulic means of employing, but has problem difficult in maintenance equally.

The utility model content

The purpose of this utility model is: provide a kind of simple to operate, measurement data stable, safeguard simple full-automatic Falling Weight Deflectometer.

Technical solution of the present utility model is: full-automatic Falling Weight Deflectometer mainly comprises bogey, lifting and releasing means and bogey hoisting gear drop hammer.Drop hammer to promote and form by electromagnet, crossbeam, two guide rails and two electric pushrods with releasing means; Electromagnet is installed in the crossbeam middle part, and the crossbeam two ends are connected with two guide rails, can move up and down along guide rail; Two electric pushrods are installed in the crossbeam both sides.

Described bogey is made up of cushion pad, buffing pad, bearing frame and loading plate; The bearing frame lower end is fixed on the loading plate, and the upper end is connected with buffing pad, and cushion pad is installed on the buffing pad; Loading plate is made up of rebound, four 1/4 circular metal plates and four 1/4 round rubber plates; Four sheet metals are formed a circle, connect by attachment pegs between per two sheet metals, and every sheet metal upper surface is connected by universal joint with rebound, and four blocks of rubber slabs are connected respectively with the lower surface of four sheet metals.

The upper surface of described cushion pad has a plurality of rubber column projections.

Described bogey hoisting gear is made up of electronic pull bar, wire rope and pulley, and pulley is the bogey both sides fixedly, and the steel wire penetrating pulley is connected with the electronic pull bar at two ends.

The utility model advantage compared with prior art is:

1,, makes the designs simplification, easy to maintenance of full-automatic Falling Weight Deflectometer because drop hammer lifting and releasing means and adopt electric pushrod and electromagnet makes up mode.

2, adopt the universal joint technology in the loading plate of bogey, can realize Automatic Levelling easily, improved the accuracy of measurement data.

In addition, the bogey hoisting gear adopts electronic pull bar mode, also makes designs simplification of the present utility model, easy to maintenance.

Description of drawings

Fig. 1 is the full-automatic Falling Weight Deflectometer structural representation of the utility model;

Fig. 2 is the carrying plate structure synoptic diagram;

Fig. 3 is the sheet metal connection diagram.

Embodiment

Below in conjunction with drawings and Examples utility model is further described.

Full-automatic Falling Weight Deflectometer mainly comprises bogey, lifting and releasing means and bogey hoisting gear drop hammer.As shown in Figure 1, drop hammer to promote and form by electromagnet 1, crossbeam 2, two guide rails 3 and two electric pushrods 4 with releasing means; Electromagnet 1 is installed in crossbeam 2 middle parts, and crossbeam 2 two ends are connected with two guide rails 3, and the junction is a form of sleeve, and crossbeam 2 can be moved up and down along guide rail 3; Two electric pushrods 4 are installed in crossbeam 2 both sides, are used for crossbeam 2 is upwards elected.

Bogey is made up of cushion pad 8, buffing pad 9, bearing frame 11 and loading plate 12; Bearing frame 11 lower ends are bolted to connection on loading plate 12, and its upper end is connected with buffing pad 9, and installing force sensor 10 between bearing frame 11 and the buffing pad 9 is used for the transmit force signal.Fixedly connected cushion pad 8 on the buffing pad 9, the upper surface of cushion pad 8 has a plurality of rubber column projections, increases buffering effect.

Loading plate 12 is made up of rebound 17, four 1/4 circular metal plates 14 and four 1/4 round rubber plates 18; Four sheet metals 14 are formed a circle, connect by attachment pegs 15 between per two sheet metals 14, and every sheet metal 14 upper surfaces are connected by universal joint 16 with rebound 17, and the lower surface of four blocks of rubber slabs 18 and four sheet metals 14 is glued respectively.

The bogey hoisting gear is made up of electronic pull bar 5, wire rope 7 and pulley 13, and pulley 13 is the bogey both sides fixedly, and wire rope 7 passes pulley 13 and is connected with the electronic pull bar 5 at two ends.

On bogey, drop hammer lifting and releasing means and bogey hoisting gear, be connected and measure and control device, measure with control device and be existing current techique.

When full-automatic Falling Weight Deflectometer road pavement is measured, at first control electronic pull bar 5 and bogey is put on the ground reposefully by wire rope 7 by external control device.Electric pushrod 4 drives crossbeams 2 and descends, and the electromagnet 1 on crossbeam 6 contacts fully with dropping hammer.Control device powers up for electromagnet 1, drops hammer 6 to be attracted on the electromagnet 1.The electric pushrod 4 of both sides is with crossbeam 2 and drop hammer and 6 push up level altitude along guide rail 3 together.Electromagnet 1 outage, the 6 disengaging electromagnet 1 that drop hammer freely fall to bogey.After external measurement mechanism measurement was finished, electronic pull bar 5 was lifted from ground by wire rope 7 and pulley 13 with bogey.

Behind the bogey kiss the earth, because four sheet metals 14 connect with rebound 17 by universal joint 16 respectively, and between four sheet metals 14, between sheet metal 14 and the rebound 17 certain space is arranged all, so, behind loading plate 12 contact road surfaces, will automatically do the relevant position adjustment along with the road surface situation, make the rubber blanket 18 of loading plate 12 bottoms can fully contact with the road surface.

Claims

1, full-automatic Falling Weight Deflectometer, mainly comprise bogey, drop hammer lifting and releasing means and bogey hoisting gear, it is characterized in that: drop hammer to promote and form by electromagnet (1), crossbeam (2), two guide rails (3) and two electric pushrods (4) with releasing means; Electromagnet (1) is installed in crossbeam (2) middle part, and crossbeam (2) two ends are connected with two guide rails (3), can move up and down along guide rail (3); Two electric pushrods (4) are installed in crossbeam (2) both sides.

2, according to the full-automatic Falling Weight Deflectometer of claim 1, it is characterized in that: bogey is made up of cushion pad (8), buffing pad (9), bearing frame (11) and loading plate (12); Bearing frame (11) lower end is fixed on the loading plate (12), and the upper end is connected with buffing pad (9), and buffing pad (9) is gone up cushion pad (8) is installed; Loading plate (12) is made up of rebound (16), four 1/4 circular metal plates (14) and four 1/4 round rubber plates (18); Four sheet metals (14) are formed a circle, connect by attachment pegs (15) between per two sheet metals (14), every sheet metal (14) upper surface is connected by universal joint (16) with rebound (17), and four blocks of rubber slabs (18) are connected respectively with the lower surface of four sheet metals (14).

3, according to the full-automatic Falling Weight Deflectometer of claim 2, it is characterized in that: the upper surface of cushion pad (8) has a plurality of rubber column projections.

4, according to the full-automatic Falling Weight Deflectometer of claim 1, it is characterized in that: the bogey hoisting gear is made up of electronic pull bar (5), wire rope (7) and pulley (13), pulley (13) is the bogey both sides fixedly, and wire rope (7) passes pulley (13) and is connected with the electronic pull bar (5) at two ends.