CN107843555B - Method and device for detecting true bonding strength of transverse seam of arch dam - Google Patents
Method and device for detecting true bonding strength of transverse seam of arch dam Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 238000007906 compression Methods 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 26
- 230000009471 action Effects 0.000 claims abstract description 12
- 238000011161 development Methods 0.000 claims description 14
- 238000009662 stress testing Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 9
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 238000009991 scouring Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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Abstract
The invention discloses a method and a device for detecting the real bonding strength of a transverse joint of an arch dam, wherein the method comprises the following steps: acquiring the real temperature stress of the transverse joint concrete by a concrete temperature stress tester; pouring a concrete test block containing a layer surface; applying stress history to the poured layer concrete test block through a tension-compression creep instrument; and after the stress is finished, the layer bonding strength is obtained. The method can simulate the bonding strength of the transverse seam under the action process of the real temperature stress.
Description
Technical Field
The invention relates to the technical field of concrete tests of civil engineering and hydraulic engineering, in particular to a method and a device for detecting the real bonding strength of a transverse joint of an arch dam.
Background
In order to adapt to uneven settlement of a foundation and avoid excessive temperature constraint stress, transverse seams are required to be arranged in dam design, a plurality of dam segments are respectively poured in a layered mode on the whole dam, the seam surfaces between adjacent dam segments are the transverse seams, and the concrete pouring time of the dam segments on two sides of the transverse seams is different, so that the problem of bonding of typical new and old concrete is solved; the bond strength of the transverse seam can be analogized to the bond strength of the concrete containing the layer.
After the dam concrete is poured, a large amount of hydration heat is generated, along with the exothermic process and the constraint function between dam blocks, the concrete near the transverse joints bears the load function, the load process is related to the temperature process and is called the temperature stress process, the strength of the concrete layer after the temperature stress process is different from the strength of the concrete layer after the temperature stress process is not subjected to the load process, and the bonding strength of the layer is related to the transverse joint opening time of the water-through cooling process of the arch dam. Therefore, the research on the bonding strength of the transverse seam under the action process of the temperature stress has important engineering significance for controlling the transverse seam opening of the arch dam.
TSTM (Temperature-stress testing machine, concrete Temperature stress tester) can simulate Temperature stress and deformation of concrete under the action of Temperature and constraint in a laboratory, and the connection between materials and structures is established through test means. The real bonding strength of the transverse joint concrete can be measured by combining a temperature stress test and a layer bonding strength test.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, an object of the present invention is to provide a method for detecting the actual bonding strength of the transverse seam of an arch dam, which can simulate the bonding strength of the transverse seam under the actual temperature stress action process.
The invention further aims at providing a device for detecting the real bonding strength of the transverse seam of the arch dam.
In order to achieve the above purpose, an embodiment of the present invention provides a method for detecting a true bonding strength of a transverse seam of an arch dam, including the following steps: acquiring the real temperature stress of the transverse joint concrete by a concrete temperature stress tester; pouring a concrete test block containing a layer surface; applying stress history to the poured layer concrete test block through a tension-compression creep instrument; and after the stress is finished, the layer bonding strength is obtained.
According to the method for detecting the real bonding strength of the transverse seam of the arch dam, the real temperature stress of the transverse seam concrete is obtained through the concrete temperature stress testing machine, the layer-containing concrete test block is poured, and then the stress process is applied to the poured layer-containing concrete test block through the tension-compression creep instrument, so that the layer bonding strength is obtained.
In addition, the method for detecting the true bonding strength of the transverse seam of the arch dam according to the embodiment of the invention can also have the following additional technical characteristics:
further, in an embodiment of the present invention, the obtaining the true temperature stress of the transverse joint concrete by the concrete temperature stress testing machine further includes: acquiring the temperature history of the current engineering concrete; and the temperature history of the current engineering concrete is reproduced through the concrete temperature stress testing machine, and the real concrete temperature stress development history is obtained.
Further, in one embodiment of the present invention, the pouring of the deck-containing concrete test block further comprises: pouring concrete with a first preset height through a test piece mould with a preset size; after the preset time, the upper surface of the bottom layer concrete is punched through a high-pressure water gun; and pouring concrete with a second preset height on the upper layer after the scouring is finished.
Further, in one embodiment of the present invention, the applying stress history to the poured bedding concrete test block by the tension-compression creep gauge further includes: placing the concrete test block on a loading table of the tension-compression creep instrument; and applying load through the tension-compression creep instrument, wherein the load is obtained from the actual temperature stress development process of the concrete.
Further, in an embodiment of the present invention, the obtaining the layer adhesion strength further includes: and placing the layer containing the layer test block after the load process action in the layer position in parallel to the loading direction, so as to obtain the layer bonding strength.
In order to achieve the above objective, another embodiment of the present invention provides a device for detecting a true bonding strength of a lateral seam of an arch dam, including: the first acquisition module is used for acquiring the real temperature stress of the transverse joint concrete through a concrete temperature stress tester; the pouring module is used for pouring the concrete test block containing the layer; the applying module is used for applying stress courses to the poured layer concrete test blocks through the tension-compression creep instrument; and the second acquisition module is used for acquiring the layer bonding strength after the stress is over.
According to the device for detecting the real bonding strength of the transverse seam of the arch dam, the real temperature stress of the transverse seam concrete is obtained through the concrete temperature stress testing machine; pouring a concrete test block containing a layer surface; applying stress history to the poured layer concrete test block through a tension-compression creep instrument; and after the stress is finished, the layer bonding strength is obtained.
In addition, the device for detecting the true bonding strength of the transverse seam of the arch dam according to the embodiment of the invention can also have the following additional technical characteristics:
further, in an embodiment of the present invention, the first obtaining module further includes: the first acquisition unit is used for acquiring the temperature history of the current engineering concrete; the second obtaining unit is used for reproducing the temperature history of the current engineering concrete through the concrete temperature stress testing machine and obtaining the real temperature stress development history of the concrete.
Further, in one embodiment of the present invention, the casting module further includes: the first pouring unit is used for pouring concrete with a first preset height through a test piece die with a preset size; the flushing module is used for flushing the upper surface of the bottom layer concrete through the high-pressure water gun after the preset time; and the second pouring unit is used for pouring concrete with a second preset height on the upper layer after the scouring is finished.
Further, in one embodiment of the present invention, the applying module further includes: the placing unit is used for placing the concrete test block on a loading table of the tension-compression creep instrument; and the application unit is used for applying load through the tension-compression creep instrument, wherein the load is obtained from the actual temperature stress development process of the concrete.
Further, in an embodiment of the present invention, the second obtaining module further includes:
and the measuring unit is used for placing the split filler strips at the position of the layer surface in parallel to the loading direction on the layer surface containing the layer surface test block after the load process action so as to obtain the layer surface bonding strength.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a method for detecting true bond strength of a lateral seam of an arch dam according to an embodiment of the invention;
FIG. 2 is a schematic diagram of typical temperature curves and temperature stress processes inside dam concrete according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a temperature stress tester according to one embodiment of the present invention;
FIG. 4 is a schematic illustration of a layer-containing concrete casting process according to one embodiment of the present invention;
FIG. 5 is a schematic diagram of a split tensile strength test for a deck-containing concrete according to one embodiment of the invention;
fig. 6 is a schematic structural diagram of a device for detecting true bonding strength of a transverse seam of an arch dam according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The method and the device for detecting the true bonding strength of the transverse seam of the arch dam according to the embodiment of the invention are described below with reference to the accompanying drawings, and the method for detecting the true bonding strength of the transverse seam of the arch dam according to the embodiment of the invention is described first with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for detecting true bonding strength of a lateral seam of an arch dam according to an embodiment of the present invention.
As shown in FIG. 1, the method for detecting the true bonding strength of the transverse seam of the arch dam comprises the following steps:
in step S101, the true temperature stress of the transverse joint concrete is obtained by a concrete temperature stress tester.
In step S102, a concrete test block containing a layer is poured.
In step S103, a stress history is applied to the poured bedding concrete test piece by a tension/compression creep machine.
In step S104, after the stress is applied, the layer bonding strength is obtained.
Further, in one embodiment of the present invention, the method for obtaining the true temperature stress of the transverse joint concrete by the concrete temperature stress tester further comprises: acquiring the temperature history of the current engineering concrete; and reproducing the temperature history of the current engineering concrete through a concrete temperature stress tester, and obtaining the real temperature stress development history of the concrete.
It will be appreciated that, in connection with fig. 2 and 3, the temperature history of the current engineering concrete is shown at 201 in fig. 2, and the typical temperature stress development history is shown at 202 in fig. 2.
Further, in one embodiment of the present invention, casting a concrete test block containing a deck further comprises: pouring concrete with a first preset height through a test piece mould with a preset size; after the preset time, the upper surface of the bottom layer concrete is punched through a high-pressure water gun; and pouring concrete with a second preset height on the upper layer after the scouring is finished.
It can be appreciated that the embodiment of the present invention may be used to pour the concrete with the first preset height through the test piece mold with the preset size, where the first preset height may be set by a person skilled in the art according to the actual situation, and is not specifically limited herein. As shown in fig. 4, the underlying concrete may be 401; after the preset time, the upper surface of the bottom layer concrete, namely a 402-layer surface part, is punched by a high-pressure water gun; after finishing the scouring, pouring concrete of a second preset height on the upper layer, namely 403-top surface part.
Further, in one embodiment of the present invention, the stress history is applied to the poured bedding concrete test block by a tension-compression creep gauge, further comprising: placing the concrete test block on a loading table of a tension-compression creep instrument; and (3) applying load through a tension-compression creep instrument, wherein the load is obtained from the actual temperature stress development process of the concrete.
It can be appreciated that the load is the actual temperature stress development history of the concrete, as shown at 202 in fig. 2; the direction of the applied load is shown as 404 in fig. 4.
Further, in one embodiment of the present invention, obtaining the layer adhesion strength further includes: and placing the layer containing the layer test block after the load process action at the layer position in parallel to the loading direction so as to obtain the layer bonding strength.
It can be appreciated that, as shown in fig. 2 and fig. 5, the embodiment of the present invention may be configured such that the 402-level surface of the test block with the level surface after the load history effect of 202 in fig. 2 is parallel to the loading direction, and as shown in 402 in fig. 5, the 501 split pad strip is placed at the 402-level surface to obtain the 402-level split bonding strength.
According to the method for detecting the real bonding strength of the transverse seam of the arch dam, which is provided by the embodiment of the invention, the real temperature stress of the transverse seam concrete is obtained through a concrete temperature stress testing machine; pouring a concrete test block containing a layer surface; applying stress history to the poured layer concrete test block through a tension-compression creep instrument; and after the stress is finished, the layer bonding strength is obtained.
Next, a device for detecting the true bonding strength of the transverse seam of the arch dam according to the embodiment of the invention is described with reference to the attached drawings.
Fig. 6 is a schematic structural view of a device for detecting true bonding strength of a transverse seam of an arch dam according to an embodiment of the present invention.
As shown in fig. 6, the device 10 for detecting the true bonding strength of the transverse seam of the arch dam comprises: a first acquisition module 100, a casting module 200, an application module 300 and a second acquisition module 400. The first obtaining module 100 is used for obtaining real temperature stress of the transverse joint concrete through a concrete temperature stress testing machine. The casting module 200 is used for casting the concrete test block with the layer. The application module 300 is used for applying stress history to the poured bedding concrete test block through a tension-compression creep meter. The second acquisition module 400 is used for acquiring the layer bonding strength after the stress is over. The device 10 of the embodiment of the invention can simulate the bonding strength of the transverse seam under the actual temperature stress action process.
Further, in one embodiment of the present invention, the first obtaining module 100 further includes: a first acquisition unit and a second acquisition unit. The first acquisition unit is used for acquiring the temperature history of the current engineering concrete. The second acquisition unit is used for reproducing the temperature history of the current engineering concrete through the concrete temperature stress testing machine and acquiring the real temperature stress development history of the concrete.
Further, in one embodiment of the present invention, the casting module 200 further includes: the device comprises a first pouring unit, a flushing module and a second pouring unit. The first pouring unit is used for pouring concrete with a first preset height through a test piece die with a preset size. The flushing module is used for flushing the upper surface of the bottom concrete through the high-pressure water gun after the preset time. And the second pouring unit is used for pouring concrete with a second preset height on the upper layer after the scouring is finished.
Further, in one embodiment of the present invention, the application module 300 further includes: a placement unit and an application unit. The placing unit is used for placing the concrete test block on a loading table of the tension-compression creep instrument, and the applying unit is used for applying load through the tension-compression creep instrument, wherein the load is obtained from the real temperature stress development process of the concrete.
Further, in one embodiment of the present invention, the second obtaining module 400 further includes: and a measurement unit. The measuring unit is used for placing the split-pull filler strip at the position of the layer surface in parallel to the loading direction on the layer surface containing the layer surface test block after the load process action so as to obtain the layer surface bonding strength.
It should be noted that, the explanation of the foregoing embodiment of the method for detecting the actual bonding strength of the transverse seam of the arch dam is also applicable to the device for detecting the actual bonding strength of the transverse seam of the arch dam in this embodiment, and will not be repeated here.
According to the device for detecting the real bonding strength of the transverse seam of the arch dam, which is provided by the embodiment of the invention, the real temperature stress of the transverse seam concrete is obtained through the concrete temperature stress testing machine; pouring a concrete test block containing a layer surface; applying stress history to the poured layer concrete test block through a tension-compression creep instrument; and after the stress is finished, the layer bonding strength is obtained.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. The method for detecting the true bonding strength of the transverse seam of the arch dam is characterized by comprising the following steps of:
acquiring the real temperature stress of the transverse joint concrete by a concrete temperature stress tester;
pouring a concrete test block containing a layer surface;
applying stress history to the poured layer concrete test block through a tension-compression creep instrument; and
after the stress is finished, the layer bonding strength is obtained;
the method for obtaining the true temperature stress of the transverse joint concrete by the concrete temperature stress testing machine further comprises the following steps:
acquiring the temperature history of the current engineering concrete, wherein the temperature history is an arch dam temperature control curve;
the temperature history of the current engineering concrete is reproduced through the concrete temperature stress testing machine, and the real temperature stress development history of the concrete is obtained;
the stress course is applied to the poured layer concrete test block through the tension-compression creep instrument, and the method further comprises the following steps:
placing the concrete test block on a loading table of the tension-compression creep instrument;
and applying load through the tension-compression creep instrument, wherein the load is obtained from the real temperature stress development process of the concrete, and the direction of applying the load is perpendicular to the direction of the layer surface of the concrete test block.
2. The method for detecting true bond strength of a lateral seam of an arch dam of claim 1, wherein the casting of the concrete test block with the layer further comprises:
pouring concrete with a first preset height through a test piece mould with a preset size;
after the preset time, the upper surface of the bottom layer concrete is punched through a high-pressure water gun;
and pouring concrete with a second preset height on the upper layer after the scouring is finished.
3. The method for detecting true bonding strength of a transverse seam of an arch dam according to claim 1, wherein the step of obtaining the layer bonding strength further comprises:
and placing the layer containing the layer test block after the load process action in the layer position in parallel to the loading direction, so as to obtain the layer bonding strength.
4. The utility model provides a detection device of true bonding strength of arch dam transverse joint which characterized in that includes:
the first acquisition module is used for acquiring the real temperature stress of the transverse joint concrete through a concrete temperature stress tester;
the pouring module is used for pouring the concrete test block containing the layer;
the applying module is used for applying stress courses to the poured layer concrete test blocks through the tension-compression creep instrument; and
the second acquisition module is used for acquiring the layer bonding strength after the stress action is finished;
the first acquisition module further includes:
the first acquisition unit is used for acquiring the temperature history of the current engineering concrete, wherein the temperature history is an arch dam temperature control curve;
the second acquisition unit is used for reconstructing the temperature history of the current engineering concrete through the concrete temperature stress testing machine to acquire the real temperature stress development history of the concrete;
the application module further comprises:
the placing unit is used for placing the concrete test block on a loading table of the tension-compression creep instrument;
and the application unit is used for applying load through the tension-compression creep instrument, wherein the load is obtained from the real temperature stress development process of the concrete, and the direction of the applied load is perpendicular to the direction of the layer surface of the concrete test block.
5. The device for detecting true bond strength of an arch dam transverse seam of claim 4, wherein the casting module further comprises:
the first pouring unit is used for pouring concrete with a first preset height through a test piece die with a preset size;
the flushing module is used for flushing the upper surface of the bottom layer concrete through the high-pressure water gun after the preset time;
and the second pouring unit is used for pouring concrete with a second preset height on the upper layer after the scouring is finished.
6. The device for detecting true bond strength of an arch dam transverse seam of claim 4, wherein the second acquisition module further comprises:
and the measuring unit is used for placing the split filler strips at the position of the layer surface in parallel to the loading direction on the layer surface containing the layer surface test block after the load process action so as to obtain the layer surface bonding strength.
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| CN109030345A (en) * | 2018-07-13 | 2018-12-18 | 中国葛洲坝集团国际工程有限公司 | A kind of face-plate of rockfill dam base surface restraint stress detection method |
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