阅读说明：本技术 一种用于坝体模型材料电阻式应变片的粘结剂及粘贴方法 (Binder for dam body model material resistance type strain gauge and pasting method ) 是由 *** 杨宝全 陈媛 陈建叶 张�林 罗敏 张芮瑜 于 2019-09-30 设计创作，主要内容包括：本发明涉及地质力学模型试验技术领域,尤其涉及一种可以将电阻应变片粘贴在坝体模型材料上的粘结剂及粘贴方法,所述粘结剂,包括以下重量份的物质,乙基纤维素5-10份,甲苯70-75份,无水乙醇15-25份；本发明中通过以混合有机溶剂为载体,乙基纤维素作为辅助胶体,形成一种和坝体模型材料的变形协调一致的粘结剂,用在低强度低变形模量的坝体模型材料上不易干燥脱落,避免了502胶干燥后过硬与坝体模型材料的变形错位,使实验过程中反映出的地质构造与工程建筑之间的关系更加真实。(The invention relates to the technical field of geomechanical model tests, in particular to a binder capable of pasting a resistance strain gauge on a dam body model material and a pasting method, wherein the binder comprises the following substances, by weight, 5-10 parts of ethyl cellulose, 70-75 parts of toluene and 15-25 parts of absolute ethyl alcohol; according to the dam model material and the preparation method thereof, the mixed organic solvent is used as a carrier, the ethyl cellulose is used as an auxiliary colloid, the adhesive which is coordinated with the deformation of the dam model material is formed, the adhesive is not easy to dry and fall off when being used on the dam model material with low strength and low deformation modulus, the over-hardness of the 502 adhesive after drying and the deformation dislocation of the dam model material are avoided, and the relation between the geological structure and the engineering building reflected in the experimental process is more real.)

1. The adhesive for the dam body model material resistance strain gauge is characterized by comprising, by weight, 5-10 parts of ethyl cellulose, 70-75 parts of toluene and 15-25 parts of absolute ethyl alcohol.

2. The adhesive for the dam model material resistance strain gauge as claimed in claim 1, wherein: the ratio of the absolute ethyl alcohol to the toluene is 1: 2.8-1: 5.

3. the preparation method of the binder for the dam body model material resistance strain gauge as claimed in claim 1, characterized by comprising the following steps:

S1, pouring absolute ethyl alcohol and toluene into a beaker in sequence to form a mixed solution, and stirring to uniformly mix the mixed solution for later use;

s2, adding ethyl cellulose into the mixed solution, continuously stirring while adding the ethyl cellulose to form uniformly mixed turbid liquid, sealing the turbid liquid by using a tin-platinum paper, and reserving at least one small hole on the tin-foil paper;

S3, placing the beaker of the S2 in a cool and ventilated place, and standing to enable the ethyl cellulose to be completely dissolved in the mixed solution, so as to finally obtain the prepared binder.

4. The method for applying the adhesive for the dam model material resistance strain gauge as claimed in claim 1, comprising the steps of:

a. Preparing the strain gauge for pasting after proportionally reducing and processing the dam body according to the designed body shape requirement;

b. Determining the position of a strain gauge adhered on the dam body model, and cleaning the surface of the strain gauge;

c. coating the prepared binder on the surface of a dam body model to which a strain gauge needs to be adhered, and drying the binder for later use;

d. c, pasting the strain gauge on transparent adhesive, then pasting an adhesive on the surface of the transparent adhesive, pasting the strain gauge on the dam surface model in the step c, and pressing for 50-70s to enable the strain gauge to be tightly combined with the surface of the dam body model;

e. and after the adhesive is dried, the adhesion of the strain gauge and the surface of the dam body model is finished.

Technical Field

the invention relates to the technical field of geomechanical model tests, in particular to a bonding agent and a bonding method for bonding a resistance strain gauge on a dam body model material.

Background

in the construction of water conservancy and hydropower engineering, concrete materials are used as dam bodies of water retaining buildings, the dam bodies mainly have two forms of an arch dam and a gravity dam, stability analysis of high concrete dams under complex geological conditions is achieved, a geomechanical model test is an important research method, the geomechanical model test is a method for carrying out scale reduction research on specific engineering geological problems according to a certain similarity principle, and the main purpose of the test is to research the ultimate bearing capacity, the damage form, the damage mechanism and the deformation distribution characteristics of various buildings under the action of external load. The method can truly reflect the relation between the geological structure and the engineering building, simulate the influence of the engineering building on the rock mass, and more intuitively display the results of the influence of the engineering building on the rock mass and the influence of the deformation and deformation of the rock mass on the building structure.

after the geomechanical model is manufactured, in order to research the deformation characteristics and the trend of a dam body under a loaded condition, a resistance type strain gauge needs to be adhered to the dam body, data acquisition is carried out through a strain gauge, the adhering material and the method of the strain gauge are very mature, and the adhering steps mainly comprise strain gauge preparation, cleaning treatment of a member surface measuring point, adhering, drying treatment, welding and fixing of a lead, adhering quality inspection, strain gauge protection, lead protection treatment and the like. The adhesive used by the patch is 502 glue, but the 502 glue which is commonly used at present cannot be effectively adhered on the surface of the dam body model material, is extremely easy to dry and fall off, and in addition, under the loading state, the excessively hard adhesive cannot be consistent with the deformation coordination of the dam body model material, so the 502 glue adhesive cannot be directly used on the dam body model material.

disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a bonding agent and a bonding method for a dam body model material resistance type strain gauge.

The purpose of the invention is realized by the following technical scheme:

the adhesive for the dam body model material resistance strain gauge comprises, by weight, 5-10 parts of ethyl cellulose, 70-75 parts of toluene and 15-25 parts of absolute ethyl alcohol.

Preferably, the ratio of the absolute ethyl alcohol to the toluene is 1: 2.8-1: 5.

Preferably, the preparation method of the binder for the dam body model material resistance type strain gauge comprises the following steps:

S1, pouring absolute ethyl alcohol and toluene into a beaker in sequence to form a mixed solution, and stirring to uniformly mix the mixed solution for later use;

S2, adding ethyl cellulose into the mixed solution, continuously stirring while adding the ethyl cellulose to form uniformly mixed turbid solution, sealing the turbid solution by using a tin-platinum paper, and leaving at least one small hole on the tin-foil paper for volatilization of an organic solvent, wherein the toluene needs to be dewatered before use, and the specific operation is as follows: the metal sodium is obtained by taking the size of mung bean and putting the mung bean into a round-bottom flask containing toluene, taking a spoon of benzophenone as an indicator, heating to a boiling point, refluxing, and extracting and storing a fraction in a molecular sieve when the solution is dark blue.

S3, placing the beaker of the S2 in a cool and ventilated place, and standing to enable the ethyl cellulose to be completely dissolved in the mixed solution, so as to finally obtain the prepared binder.

A method for pasting a binder for a dam body model material resistance type strain gauge comprises the following steps:

a. preparing the strain gauge for pasting after proportionally reducing and processing the dam body according to the designed body shape requirement;

b. Determining the position of a strain gauge adhered on the dam body model, and cleaning the surface of the strain gauge;

c. Coating the prepared binder on the surface of a dam body model to which a strain gauge needs to be adhered, and drying the binder for later use;

d. C, pasting the strain gauge on transparent adhesive, then pasting an adhesive on the surface of the transparent adhesive, pasting the strain gauge on the dam surface model in the step c, and pressing for 50-70s to enable the strain gauge to be tightly combined with the surface of the dam body model;

e. and after the adhesive is dried, the adhesion of the strain gauge and the surface of the dam body model is finished.

The invention has the beneficial effects that:

Compared with 502, the adhesive provided by the invention is more harmonious with the deformation of a dam body model material resistance type strain gauge, and is not easy to fall off after long-term use, so that the effect is more obvious in a geomechanical model test.

Detailed Description