CN2179972Y

CN2179972Y - Timber strength tester

Info

Publication number: CN2179972Y
Application number: CN 93246136
Authority: CN
Inventors: 李自强; 李杏芬; 杨于北
Original assignee: BEIJING INSTITUTE OF REAL ESTATE SCIENCE AND TECHNOLOGY
Current assignee: BEIJING INSTITUTE OF REAL ESTATE SCIENCE AND TECHNOLOGY
Priority date: 1993-12-04
Filing date: 1993-12-04
Publication date: 1994-10-19
Anticipated expiration: 2003-12-04

Abstract

The utility model relates to a tester which is used in the technical field of timber strength testing. The tester is especially important in the building industry and realty industry and is reliable technology means for implementing national relevant standards. A drawing device is composed of a supporting seat, a screw shaft, an outer sleeve, a dynamometer spring, an inner sleeve, a handwheel, etc. A measuring system is composed of a positioning frame, a ruler, a vernier, and a ruler holder. The drawing device and the measuring system are combined into the body of the tester. The tester has the advantages of reasonable structure, simple structure, easy operation, convenient carryover, and accurate and reliable test result, and is an ideal testing apparatus.

Description

Timber strength tester

The utility model is a kind of small-sized detecting instrument.Be mainly used in the technical field that strength of wood detects, especially when timber structure, post and panel structure and all kinds of ancient building being carried out the generaI investigation of evaluation of timber compoment material and safety case, seem especially important.

Timber structure and post and panel structure are the traditional architecture structure forms of China, though this form reduces the timber structure one-storey house, post and panel structure building and all kinds of ancient building that also have many pre-peaceful liberation periods at present and carry in the early days of foundation gradually in newly constructed house.These houses are because long neglected and in disrepair, and the broken phenomenon of danger is serious, and safety case is relatively poor, and the dilapidated house rate is higher, house collapse often takes place cause people and animals' casualty accident.The investigation proof is in the house collapse accident, that causes owing to timber compoment is rotten accounts for 60%, Housing Authority and Housing Department in all parts of the country all will drop into a large amount of human and material resources every year wooden frame structure is carried out safe generaI investigation, the technological means that is adopted in generaI investigation is generally relatively backward, all judge the material and the safety case of timber compoment with range estimation and hammering method, this method exists very big defective, and not only accuracy rate is low, and can't make quantitative test to the degree of safety of structure according to check result.Therefore, domestic many administrative authoritys and detection unit wish urgently that all a kind of detecting instrument and the method that can accurately measure timber compoment intensity at the scene can be arranged.

Task of the present utility model is by non-damaged method, on-site measurement strength classes of structural timber.The grade of strength of wood is to judge by the method for " nail pulling is surveyed strong ".The utility model is the small-sized detector that a kind of mechanical property to timber is carried out quantitative test, and it is developed according to the national standard relevant regulations.It comprises supporting base (1), screw shaft (2), outer sleeve (3), dynamometer spring (4), inner sleeve (5), screw rod axle sleeve (6), chi holder (7), vernier (8), stop screw (9), ruler (10), spring base (11), retainer spring (12), locating rack (13), bearing (14), annular end cap (15) and handwheel (16).It is characterized in that screw shaft adopts clearance fit to be installed in the supporting base, and require only to allow between the two to move axially, the end of screw shaft is processed with T type groove, one end and the outer sleeve of supporting base join, stopper slot is arranged on the barrel, in the tube dynamometer spring is housed, the screw rod axle sleeve in inner sleeve, is processed with screw by Bearing Installation on the barrel, its position is corresponding with the stopper slot of outer sleeve, retainer spring and spring base also are housed in the inner sleeve, and an end of tube is equipped with annular end cap, and handwheel then is fastened on the screw rod sleeve with screw, screw shaft is connected with the screw rod sleeve, outer sleeve and inner sleeve are combined, install stop screw, promptly become the integral body of draw-off gear; With screw locating rack is fixed on the side of spring base, vernier and chi holder on the outer wall of outer sleeve, are put into ruler the vernier groove by screw retention again, and the three constitutes measurement system; The main body that is combined into the strength of wood detector of this system and draw-off gear.

The utility model is to implement relative national standards, reliable instrument to timber compoment or the evaluation of test specimen intensity, replace range estimation in the past and knock method, both stopped timber compoment because the loss of personal injury and national wealth has also been avoided in the rotten generation that causes the house collapse accident of material.This apparatus structure rationally, simple structure, easy and simple to handle, easy to carry, testing result accurately and reliably, it is a kind of desirable appliance, not only for the real estate management personnel to the generaI investigation in house, identify the condition of having created, also improved the testing staff simultaneously and judged that correctly the house intactly decreases grade, rationally uses the level of maintenance cost.Promoting the use of surely of it can demonstrate huge economic benefit and social benefit.

Fig. 1 general structure synoptic diagram of the present utility model

Finish the mode of the utility model task below in conjunction with the description of drawings of embodiment:

Choose the wood screw of having finalized the design, and on tested timber compoment or test specimen, be threaded into prescribed depth.

Screw shaft (2) Extension support seat (1) with the strength of wood detector, make wood screw laterally move into the T type groove interior (shown in figure one) of screw shaft (2) end, rotate handwheel (16), supporting base (1) and timber compoment or test specimen are joined, then screw shaft (2) also carries out relatively moving of trace with screw rod axle sleeve (6), eliminates gap everywhere; Should contact the termination of ruler (10) tightly with locating rack (13) this moment, be rotated further handwheel (16) then, then screw rod axle sleeve (6) moves inner sleeve (5) and ruler (10) by bearing (14) to the resistance that the wood screw direction overcomes dynamometer spring (4), because outer sleeve (3) remains motionless in operating process; Act on the reacting force that makes progress on the outer sleeve (3), be delivered to timber compoment or test specimen surface by supporting base (1), and act on downward reacting force on the inner sleeve (5), be delivered on the wood screw by screw shaft (2), when dynamometer spring (4) continues to be compressed, when the reacting force of its generation was screwed into withdrawal resistance on timber compoment or the test specimen greater than wood screw, wood screw was pulled out.

After wood screw is pulled out, inner sleeve (5) is bounce-back upwards, locating rack (13) breaks away from ruler (10), and that ruler (10) still rests in the vernier (8) is motionless, at this moment just can go up reading numerical values from ruler (10), maximum compressibility when this numerical value is dynamometer spring (4) pressurized can be inferred from this numerical value and the maximum withdrawal resistance of wood screw can carry out scientifically quantitative test to the mechanical property of timber.

Claims

1, a kind of strength of wood detector, supporting base (1) is arranged, screw shaft (2), outer sleeve (3), dynamometer spring (4), inner sleeve (5), screw rod axle sleeve (6), chi holder (7), vernier (8), stop screw (9), ruler (10), spring base (11), retainer spring (12), locating rack (13), bearing (14), annular end cap (15) and handwheel (16), it is characterized in that screw shaft adopts clearance fit to be installed in the supporting base, and require only to allow between the two to move axially, the end of screw shaft is processed with T type groove, one end and the outer sleeve of supporting base join, stopper slot is arranged on the barrel, in the tube dynamometer spring is housed, the screw rod axle sleeve by Bearing Installation in inner sleeve, be processed with screw on the barrel, its position is corresponding with the stopper slot of outer sleeve, retainer spring and spring base also are housed in the inner sleeve, one end of tube is equipped with annular end cap, handwheel then is fastened on the screw rod sleeve with screw, screw shaft is connected with the screw rod sleeve, make outer sleeve and inner sleeve combination, after installing stop screw, promptly become the integral body of draw-off gear; With screw locating rack is fixed on the side of spring base, vernier and chi holder on the outer wall of outer sleeve, are put into ruler the vernier groove by screw retention again, and the three constitutes measurement system; The main body that is combined into the strength of wood detector of this system and draw-off gear.