CN2879164Y

CN2879164Y - Experimental box for drawing test

Info

Publication number: CN2879164Y
Application number: CNU2006200499294U
Authority: CN
Inventors: 郑健龙; 杨和平; 韦秉旭; 刘龙武
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2006-01-25
Filing date: 2006-01-25
Publication date: 2007-03-14
Anticipated expiration: 2016-01-25

Abstract

The utility model associates a test chamber for pullout test used in the study for friction property of the interface between soil and geosynthetics. The test chamber is separated into a top chamber, a bottom chamber, and an upper cover which covers the top chamber on which a supporting device is equipped. The top chamber is on the top of the bottom chamber but there is no contact between the two. The top chamber lies in the suspending situation. The force, loaded by air-bag, is 100% acted on the geogrid, eliminating the effect of the friction force between the top chamber wall and the soil to greatly improve the precision of testing data.

Description

Be used for the chamber of pull-out test

Technical field

The utility model relates to the chamber that is used to study soil and the pull-out test of geosynthetics interface friction characteristics.

Background technology

Pull-out test is the efficiency test means of research soil and geosynthetics interface friction characteristics.Testing equipment comprises chamber, loading system and measurement system etc.Regulation according to the relevant drawing rub test of highway geosynthetics testing regulations, the box sizes of pull-out test should not be less than 25cm * 20cm * 20cm (length * wide * height), sidewall should have enough rigidity, half eminence of case one distolateral wall has the horizontal slot of traversing overall with, high about 5mm draws casing for sample.As shown in Figure 1, there is sample 1 to insert in the soil 5 in the chamber 6, slit 3 is arranged on the casing.During measurement, apply normal pressure 4 vertically downward, on sample 1, apply pulling force 2 from the casing top.

The pull-out test mechanism of action is the GSZ shop to be embedded in the acting force that applies vertical direction in the soil body simulate extraneous stressed.One end of GSZ is exposed at the soil outside, applies the relative motion that horizontal pulling capacity is simulated soil and grid face, surrender, be pulled out or break up to grid.In this process, measure the displacement of GSZ and the pulling force of end, by analyzing the friction factor that to determine between muscle soil.

Because upper box lid is on nowel, the friction force in the existence between tank wall and the soil, test data is inaccurate.

Summary of the invention

The technical solution of the utility model is: chamber is divided into upper and lower case and upper cover part, and loam cake covers on top box, is provided with bracing or strutting arrangement on top box, and top box but does not contact with nowel on nowel.

Among the utility model embodiment, the bracing or strutting arrangement on the said top box comprises screw rod, offers the screw that mates with screw rod on the edge of top box, and screw rod places screw, passes the hole that covers in the screw rod upper end, and nut sleeve is arranged on screw rod.

In chamber, adopt the come-up packing technique, promptly before loading, screw rod jack-up 3-5mm will be used between the upper and lower case, unclamp bolt after the loading, top box is in suspended state as a result, the power 100% that air bag loads passes to GSZ, eliminate the influence of the friction force between last tank wall and the soil, improved the accuracy of test data widely.

Description of drawings

Fig. 1 is the structure diagram of chamber in the prior art;

Fig. 2 is the structural representation of the utility model embodiment;

Fig. 3 is the structural representation of top box among the utility model embodiment;

Fig. 4 is the structural representation of loam cake among the utility model embodiment.

Embodiment

As shown in Figure 2, the chamber that is used for pull-out test that the utility model provides, be divided into top box 7, nowel 8 and loam cake 9 parts, loam cake 9 covers on top box 7, bracing or strutting arrangement on the top box 7 comprises screw rod 10, offers the screw 11 that mates with screw rod 10 on the edge of top box 7, and screw rod 10 places screw 11, pass the hole 12 on the loam cake 9 in screw rod 10 upper ends, and have nut 13 to be enclosed within on the screw rod 10.

Claims

1, be used for the chamber of pull-out test, comprise upper and lower case and upper cover part, it is characterized in that loam cake covers on top box, be provided with bracing or strutting arrangement on top box, top box but does not contact with nowel on nowel.

2, the chamber that is used for pull-out test according to claim 1, it is characterized in that the bracing or strutting arrangement on the said top box comprises screw rod, on the edge of top box, offer screw with the screw rod coupling, screw rod places screw, pass the hole that covers in the screw rod upper end, and nut sleeve is arranged on screw rod.