CN204594413U - A kind of device of inside concrete strain testing - Google Patents

Abstract

The utility model provides a kind of inside concrete strain detection testing device, comprising: for the casting concrete test template of test specimen, at least one base sheet and connecting line; Described base sheet is arranged at described concrete test test specimen close beta point; Described base sheet is the lead flake being pasted with strain rosette and applying one deck marine glue; It is outside to described concrete test test specimen that described strain rosette draws wire; The two ends, left and right of described lead flake have a depressed part respectively, and four drift angles of described lead flake are respectively equipped with connecting hole, and the left and right sides of described lead flake is respectively equipped with a bond stress and strengthens hole near the position of described depressed part; Four of base sheet drift angles and template are fixed by connecting hole by described connecting line.Utilize this device, the strain size of inside concrete pre-position can be tested, thus be conducive to the situations such as the internal modification of research xoncrete structure under outside load action, cracking.

Description

A kind of device of inside concrete strain testing

Technical field

The utility model relates to a kind of device of inside concrete strain testing.

Background technology

Concrete is the building materials of widespread use in civil engineering work.Under all kinds of load action, the concrete in buildings or structures all has distortion in various degree to produce, and these distortion are distributed in concrete outside surface and inside thereof comparatively widely.No matter distortion appears at concrete any position, all to general safety and the permanance generation threat of buildings, is therefore necessary to measure the structural strain's situation of concrete under load action.According to existing experimental technique, the distortion (measuring with strain) of concrete outside surface comparatively simply can be measured by means of means such as concrete strain sheet, mechanical milscales (table) and be obtained, and correlation technique is comparatively ripe.But how obtaining the concrete internal strain in key position place in building structure, is a great problem of the many scholars of long-standing problem.At present, the method mostly adopted various Fibre Optical Sensor is nuzzled in advance concrete to measure its internal strain situation.Optical fiber sensor can the strain of concrete material inside and crack initiation situation as a kind of novel product, but the features such as the distortion that the own volume of Fibre Optical Sensor large (generally undersized also want 50mm, large-sized 250mm of reaching is even longer) is unfavorable for implanting, cost is high, only can test single direction also cause the concern of many scholars gradually.For improving the problems referred to above, the utility model provides and a kind ofly utilizes traditional resistance strain plate to carry out inside concrete strain detection testing device and method, can realize the test of principal strain when inside concrete measuring point place single shaft, biaxial stress state.

Utility model content

Technical problem underlying to be solved in the utility model is to provide a kind of proving installation for testing concrete component internal strain size.Utilize this device, the strain size of inside concrete pre-position can be tested, thus be conducive to the situations such as the internal modification of research xoncrete structure under outside load action, cracking.

In order to solve above-mentioned technical matters, the utility model provides a kind of inside concrete strain detection testing device, comprising: for the casting concrete test template of test specimen, at least one base sheet and connecting line;

Described base sheet is arranged at described concrete test test specimen close beta point; Described base sheet is the lead flake being pasted with strain rosette; It is outside to described concrete test test specimen that described strain rosette draws wire; The two ends, left and right of described lead flake have a depressed part respectively, and four drift angles of described lead flake are respectively equipped with connecting hole, and the left and right sides of described lead flake is respectively equipped with a bond stress and strengthens hole near the position of described depressed part;

Four of base sheet drift angles and template are fixed by connecting hole by described connecting line.

In a preferred embodiment: described lead flake is of a size of length 50mm, width 30mm, thickness 1-2mm.

In a preferred embodiment: when described base sheet is a plurality of, fix after four drift angle connecting line series connection of described a plurality of base sheet with described template again.

In a preferred embodiment: described connecting line and the connected mode between template are for welding or colligation.

In a preferred embodiment: it is outside that the wire that the strain rosette of described a plurality of base sheet is drawn is fixed to described concrete test test specimen after gathering colligation, and to be separated by a safe distance with concrete test test specimen.

In a preferred embodiment: described strain rosette is 45 ° of strain rosettes, one deck marine glue is applied and on it.

The technical solution of the utility model possesses following beneficial effect:

The device of a kind of inside concrete strain testing that the utility model provides, employ the plumbous material as base sheet, with concrete, there is close elastic modulus and good compatible deformation ability due to plumbous, particularly plumbous elastic modulus is slightly less than concrete, therefore can reflect concrete strain comparatively sensitively, thus be conducive to the situations such as the internal modification of research xoncrete structure under outside load action, cracking.

Accompanying drawing explanation

Fig. 1 is the structural drawing of inside concrete strain detection testing device in the utility model embodiment 1;

Fig. 2 is the structural drawing of base sheet in the utility model embodiment 1.

Embodiment

Hereafter in conjunction with the accompanying drawings and embodiments the utility model is described further.

Embodiment 1

With reference to Fig. 1-2, a kind of device of inside concrete strain testing, comprises making step:

1) according in testing program, the quantity of inside concrete measuring point, the present embodiment to be inner measuring point be 1 situation, the base sheet 1 that processing and fabricating is corresponding with it; Described base sheet 1 is the lead flake 12 for being pasted with strain rosette 11; The two ends, left and right of described lead flake 12 have a depressed part 121 respectively, and four drift angles of described lead flake 12 are respectively equipped with connecting hole 122, and the left and right sides of described lead flake 12 is respectively equipped with a bond stress and strengthens hole 123 near the position of described depressed part 121.

For can accurately reflect that inside concrete strains, need select there is with concrete close elastic modulus and good compatible deformation ability material as base sheet 1 to paste strain rosette 11.Through investigation and comparison, the utility model technology selects metallic lead as the material of base sheet 1, and due to the modular ratio concrete of lead smaller, so can be comparatively responsive reflect concrete strain.For guarantee to paste strain rosette 11 and can with concrete compatible deformation, lead flake 12 need have certain length.After deliberation, the utility model adopts the lead flake 12 of length 50mm, width 30mm, thickness 1-2mm, the left and right sides of lead flake 12 is processed depressed part 121 and bond stress enhancing hole 123 simultaneously, just can realize and ensure above-mentioned effect.

2) pre-set the template 3 being used on casting concrete test test specimen, and four drift angles of described base sheet 1 are fixed by connecting line 2 and template 3, thus base sheet 1 correspondence is set in the position of described inner measuring point;

3) face of the wire 111 of strain rosette 11 from casting concrete is drawn, and be fixed on periphery and make to carrying out test specimen the position do not affected;

4) concrete building is carried out; First build lower concrete, stopping to having during the position of base sheet 1 when building, vibrating, after closely knit, the precalculated position of adjustment base sheet 1 and orientation, then build, base sheet 1 is covered;

5) wire 111 that strain rosette 11 is drawn is connected with data acquisition system (DAS), computer, the strain numerical value ε in three directions on each measuring point of Real-time Collection inside concrete _{0 °}, ε _{45 °}, ε _{90 °}, then in conjunction with principal strain formula ε ₁, ε ₂:

Obtain two plane principle stress σ at each measuring point place ₁, σ ₂:

$\left.\begin{array}{c}{\mathrm{\σ}}_1=\frac{E}{1-{\mathrm{\μ}}^2}({\mathrm{\ϵ}}_1+\mathrm{\μ}{\mathrm{\ϵ}}_2)\\ {\mathrm{\σ}}_2=\frac{E}{1-{\mathrm{\μ}}^2}({\mathrm{\ϵ}}_2+\mathrm{\μ}{\mathrm{\ϵ}}_1)\end{array}\right\}$

Wherein, E, μ are respectively elastic modulus and the Poisson ratio of concrete material, are the build-in attribute of material.Embodiment 2

In the present embodiment, described inner measuring point is a plurality of, and described base sheet also corresponds to a plurality of; Fix after four drift angle connecting line series connection of described a plurality of base sheet with described template again.

And the wire that the strain rosette of described a plurality of base sheet is drawn after gathering colligation, be fixed to described concrete test test specimen outside, and to be separated by a safe distance with concrete test test specimen; Thus do not affect concrete building.

When carrying out concreting, stopping to having during the position of base sheet whenever building, vibrating, after closely knit, the precalculated position of adjustment base sheet and orientation, then build, base sheet is covered; So repeatedly, until all base sheet materials are all capped.

Every remainder is identical with embodiment 1, repeats no more.

The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims (6)

1. an inside concrete strain detection testing device, is characterized in that comprising: for the casting concrete test template of test specimen, at least one base sheet and connecting line;

Described base sheet is arranged at described concrete test test specimen close beta point; Described base sheet is the lead flake being pasted with strain rosette; It is outside to described concrete test test specimen that described strain rosette draws wire; The two ends, left and right of described lead flake have a depressed part respectively, and four drift angles of described lead flake are respectively equipped with connecting hole, and the left and right sides of described lead flake is respectively equipped with a bond stress and strengthens hole near the position of described depressed part;

Four of base sheet drift angles and template are fixed by connecting hole by described connecting line.

2. a kind of inside concrete strain detection testing device according to claim 1, is characterized in that: described lead flake is of a size of length 50mm, width 30mm, thickness 1-2mm.

3. a kind of inside concrete strain detection testing device according to claim 1, is characterized in that: when described base sheet is a plurality of, fixes after four drift angle connecting line series connection of described a plurality of base sheet with described template again.

4. a kind of inside concrete strain detection testing device according to claim 1, is characterized in that: described connecting line and the connected mode between template are for welding or colligation.

5. a kind of inside concrete strain detection testing device according to claim 3, it is characterized in that: it is outside that the wire that the strain rosette of described a plurality of base sheet is drawn is fixed to described concrete test test specimen after gathering colligation, and to be separated by a safe distance with concrete test test specimen.

6. a kind of inside concrete strain detection testing device according to any one of claim 1-5, is characterized in that: described strain rosette is 45 ° of strain rosettes, and it applies one deck marine glue.