CN105067517A - In-situ presumption method for shearing strength of masonry mortar - Google Patents
In-situ presumption method for shearing strength of masonry mortar Download PDFInfo
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- CN105067517A CN105067517A CN201510565970.0A CN201510565970A CN105067517A CN 105067517 A CN105067517 A CN 105067517A CN 201510565970 A CN201510565970 A CN 201510565970A CN 105067517 A CN105067517 A CN 105067517A
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- shearing strength
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Abstract
The invention discloses an in-situ presumption method for shearing strength of masonry mortar, comprising the following steps: (1) drilling a through hole in the middle of a brick of a wall; (2) enabling the head end of one tiepiece to pass through the through hole, connecting a gasket to the head end of the tiepiece, and connecting the tail end of the tiepiece to a drawing apparatus after the tail end passes through a bracket with a cavity; (3) applying tensile force to the tiepiece by using the drawing apparatus and pulling the brick out from the mortar joint of the wall; (4) recording the tensile force N at the moment when the brick is pulled out; (5) calculating the shearing strength value of the mortar between the brick and the adjacent brick; and (6) calculating the average value of the shearing strength values of a plurality of measuring points, thus obtaining the presumed value of the shearing strength of the mortar of the wall. The method has the advantages of being suitable for mortar of various strength grades and types, such as lime mortar and cement mortar, being convenient to operate and simple in principle, and being small in damage to the wall which is easy to repair. The method further has the advantages of being wide in application scope, easy to operate and small in damage to the wall, and strong in applicability.
Description
Technical field
The present invention relates to a kind of original position presuming method of masonry mortar shearing strength, be applicable to the masonry mortar of various intensity.
Background technology
Masonry structure has long history in China and applies widely, and no matter in city or rural area, masonry structure is all one of primary structure form of tier building.Mortar strength is the key factor directly affecting masonry structure security.For existing masonry structure, existing multiple method can estimate its mortar strength at present.But most presuming method such as rebound method, some lotus method, barrel-shaped mast etc. are not all suitable for the mortar of strength grade lower than M2; The method that the scope of application is wider is all mainly by measuring the shearing strength of mortar, as original position list (two) cut method, mortar sheet cuts Fa Qie and release method.But these methods, owing to there is various difficulty in actual applications, are not widely used.
The test position of original position simple shear method requires to be selected in window hole place, needs to remove window for Existing reinforced concrete bridge, and failure mechanics is comparatively large, and testing cost is high; Original position double shear method and release method all need in body of wall, to draw out part fragment of brick for laying Bracket for Inspection or instrument, larger to the damage of original wall body; It is large stretch of that mortar sheet method of cutting requires in body of wall, take out some original state mortars, and difficulty is larger.
Summary of the invention
The problem that the present invention solves is to provide a kind of applied widely, operates easy and to the less mortar shearing strength of damage of wall original position presuming method.
Technical scheme of the present invention is: a kind of original position presuming method of mortar shearing strength, is characterized in that, comprise the following steps:
(1) at the drilled in middle through hole of one piece of fragment of brick of body of wall;
(2) head end of a lacing wire is passed this through hole, in the head end attachment spacers of this lacing wire, the tail end of this lacing wire, is connected with a drawing instrument with after the support of cavity through one;
(3) drawing instrument applies pulling force to lacing wire, is pulled out by fragment of brick from body of wall mortar joint;
(4) the pulling force N that this fragment of brick starts when extracting is recorded
j;
(5) the shearing strength value of the mortar between this fragment of brick and adjacent fragment of brick is calculated:
Wherein: N
jfor the pulling force that drawing instrument is measured, A
jfor mortar horizontal shear seam area,
for correction factor
this correction factor
contrast through test of many times and other conventional method and draw;
(6) calculate the mean value of the shearing strength value of n measuring point (n >=3), be the shearing strength presumed value of this sheet body of wall mortar, each measuring point should be uniformly distributed on body of wall.
Described correction factor
defining method be: the shearing strength adopting conventional method to record a kind of body of wall mortar joint mortar is f
v; The N of some measuring points (n>=3) is recorded by this method
jvalue, and the A of seam sheared by known mortar
jvalue; Order
this body of wall can be obtained corresponding
value; Repeating said method, to calculate the body of wall of various dissimilar, intensity or compressive stress corresponding
value, can obtain correction factor
set.
The method test pulling force N
jthe device used comprises described lacing wire, support, pad and drawing instrument, the head end attachment spacers of lacing wire, and the tail end of this lacing wire, is connected with a drawing instrument with after the support of cavity through one; The surface of contact of this support and metope is positioned at outside fragment of brick, is provided with for the through hole through lacing wire at the center on its top.
Advantage of the present invention is as follows:
1, various strength grade, various types of mortar is applicable to, as lime mortar, sand-cement slurry etc.;
2, easy to operate, principle is simple;
3, little to wall damage face, easily repair.The advantage of this patent method is applied widely, operates easy and little to damage of wall, has very strong practicality.
Accompanying drawing explanation
Fig. 1 is the side schematic view that the inventive method is implemented.
Fig. 2 is the right view of Fig. 1.
Embodiment
See Fig. 1 and Fig. 2, the original position presuming method of a kind of mortar shearing strength of the present invention, specific implementation process is as follows:
One block of header is selected at the measuring point place of body of wall 1, a through hole is made a call in header center, by lacing wire 3 head end through through hole, and be welded with or tighten pad 4 in body of wall 1 side, the lacing wire 3 of the opposite side of cavity 1 penetrates support 2, adopt the ground tackle of drawing instrument 5 that lacing wire anchoring is good outside support 2, in whole operating process, keep the center stressed of lacing wire 3.
Carry out pressurized operation to drawing instrument 5, lacing wire drives header to extract from body of wall from mortar joint place under the pressure effect of drawing instrument 5, and record header starts pressure N when extracting
j.
The shearing strength value at this measuring point place
In above formula: N
jfor the pulling capacity that drawing instrument is measured, A
jfor the area of section (namely marking the area in 6 indication regions in Fig. 1) of seam 6 sheared by mortar,
for correction factor
wherein correction factor
should contrast through test of many times and other method and draw.
The shearing strength value of some measuring points is averaged, namely obtains the shearing strength presumed value of this sheet body of wall mortar.
Described correction factor
defining method be: the shearing strength adopting conventional method to record a kind of body of wall mortar joint mortar is f
v; The N of some measuring points (n>=3) is recorded by this method
jvalue, and the A of seam sheared by known mortar
jvalue; Order
this body of wall can be obtained corresponding
value; Repeating said method, to calculate the body of wall of various dissimilar, intensity or compressive stress corresponding
value, can obtain correction factor
set.
To certain sheet body of wall, select the correction factor that respective type, intensity and compressive stress are corresponding
and the N of some measuring points (n>=3) is recorded by this method
j, and calculate the A that seam sheared by mortar
j, by
the mortar shearing strength of this body of wall can be obtained.
Claims (3)
1. an original position presuming method for mortar shearing strength, is characterized in that, comprise the following steps:
(1) at the drilled in middle through hole of one piece of fragment of brick of body of wall;
(2) head end of a lacing wire is passed this through hole, in the head end attachment spacers of this lacing wire, the tail end of this lacing wire, is connected with a drawing instrument with after the support of cavity through one;
(3) drawing instrument applies pulling force to lacing wire, is pulled out by fragment of brick from body of wall mortar joint;
(4) the pulling force N that this fragment of brick starts when extracting is recorded
j;
(5) the shearing strength value of the mortar between this fragment of brick and adjacent fragment of brick is calculated:
Wherein: N
jfor the pulling force that drawing instrument is measured, A
jfor mortar horizontal shear seam area,
for correction factor
this correction factor
contrast through test of many times and other conventional method and draw;
(6) calculate the mean value of the shearing strength value of n measuring point (n >=3), be the shearing strength presumed value of this sheet body of wall mortar, each measuring point should be uniformly distributed on body of wall.
2. the original position presuming method of mortar shearing strength according to claim 1, is characterized in that, described correction factor
defining method be: the shearing strength adopting conventional method to record a kind of body of wall mortar joint mortar is f
v; The N of some measuring points (n>=3) is recorded by this method
jvalue, and the A of seam sheared by known mortar
jvalue; Order
this body of wall can be obtained corresponding
value; Repeating said method, to calculate the body of wall of various dissimilar, intensity or compressive stress corresponding
value, can obtain correction factor
set.
3. the original position presuming method of mortar shearing strength according to claim 1, is characterized in that, the method test pulling force N
jthe device used comprises described lacing wire, support, pad and drawing instrument, the head end attachment spacers of lacing wire, and the tail end of this lacing wire, is connected with a drawing instrument with after the support of cavity through one; The surface of contact of this support and metope is positioned at outside fragment of brick, is provided with for the through hole through lacing wire at the center on its top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510565970.0A CN105067517A (en) | 2015-09-08 | 2015-09-08 | In-situ presumption method for shearing strength of masonry mortar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510565970.0A CN105067517A (en) | 2015-09-08 | 2015-09-08 | In-situ presumption method for shearing strength of masonry mortar |
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|---|---|
| CN105067517A true CN105067517A (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510565970.0A Pending CN105067517A (en) | 2015-09-08 | 2015-09-08 | In-situ presumption method for shearing strength of masonry mortar |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655562A (en) * | 2015-02-14 | 2015-05-27 | 广州发展环保建材有限公司 | Method for testing pull-breaking value of bonding strength of autoclaved aerated concrete interface material |
| RU2644629C1 (en) * | 2016-12-01 | 2018-02-13 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Method of determination of adhesion of cured cement mortar and device for its implementation |
| CN111175164A (en) * | 2020-01-20 | 2020-05-19 | 中国建筑科学研究院有限公司 | Method for correcting masonry strength by direct method to estimation method |
| RU2773839C1 (en) * | 2021-08-17 | 2022-06-14 | Федеральное государственное бюджетное учреждение высшего образования "Новосибирский государственный аграрный университет" | Method for determining the adhesion of cement stone to polyethylene film |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203422290U (en) * | 2013-09-09 | 2014-02-05 | 江苏省建筑科学研究院有限公司 | Special device for detecting masonry shearing strength by using shearing-resistant specimen shearing method |
| CN204287011U (en) * | 2014-12-16 | 2015-04-22 | 山东省建筑科学研究院 | Shear strength of masonry testing apparatus |
-
2015
- 2015-09-08 CN CN201510565970.0A patent/CN105067517A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203422290U (en) * | 2013-09-09 | 2014-02-05 | 江苏省建筑科学研究院有限公司 | Special device for detecting masonry shearing strength by using shearing-resistant specimen shearing method |
| CN204287011U (en) * | 2014-12-16 | 2015-04-22 | 山东省建筑科学研究院 | Shear strength of masonry testing apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 魏振超: "砌筑砂浆抗剪强度的原位拔出法研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655562A (en) * | 2015-02-14 | 2015-05-27 | 广州发展环保建材有限公司 | Method for testing pull-breaking value of bonding strength of autoclaved aerated concrete interface material |
| RU2644629C1 (en) * | 2016-12-01 | 2018-02-13 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Method of determination of adhesion of cured cement mortar and device for its implementation |
| CN111175164A (en) * | 2020-01-20 | 2020-05-19 | 中国建筑科学研究院有限公司 | Method for correcting masonry strength by direct method to estimation method |
| RU2773839C1 (en) * | 2021-08-17 | 2022-06-14 | Федеральное государственное бюджетное учреждение высшего образования "Новосибирский государственный аграрный университет" | Method for determining the adhesion of cement stone to polyethylene film |
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Application publication date: 20151118 |