CN211292670U - Concrete degree detection device that freezes - Google Patents
Concrete degree detection device that freezes Download PDFInfo
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- CN211292670U CN211292670U CN201922425162.0U CN201922425162U CN211292670U CN 211292670 U CN211292670 U CN 211292670U CN 201922425162 U CN201922425162 U CN 201922425162U CN 211292670 U CN211292670 U CN 211292670U
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Abstract
A concrete degree of freezing detection device. At present, the detection of the frozen degree of concrete is influenced by the size of a component, and has high difficulty, low efficiency and poor accuracy, so that the quality control of civil engineering construction is difficult to ensure. The utility model discloses vertical first fixed plate and the second fixed plate that is provided with side by side in the well locating rack, first fixed plate and second fixed plate are the plate body that flexible portion and stereoplasm portion formed in turn, a plurality of measuring probe from last to setting gradually between first fixed plate and second fixed plate down, every measuring probe is connected with the stereoplasm portion of first fixed plate and the stereoplasm portion of second fixed plate respectively, every measuring probe includes the sleeve pipe, film and displacement sensor, the intraductal film that is provided with of cover, be provided with displacement sensor on the film.
Description
Technical Field
The utility model belongs to a civil engineering technical field, concretely relates to concrete degree detection device that freezes.
Background
When the average outdoor daily temperature is lower than 5 ℃ continuously for five days, the concrete construction should be carried out by adopting technical measures of winter construction, because the hydration speed of the cement is mainly dependent on the temperature under a certain humidity condition, the higher the temperature is, the faster the strength is increased, and the slower the strength is otherwise. When the heat preservation measures are improper or meet cold flow suddenly, the risk of freezing and damaging the concrete in winter construction is greatly improved, and when the environmental temperature is reduced to be below 0 ℃, part of water in the concrete begins to freeze and gradually changes from liquid-phase water to solid-phase ice. The ice crystals formed initially grow in the large capillaries and as the temperature continues to drop, the strength no longer increases as the cement hydration essentially stops as most of the water in the concrete completely turns into ice. After the water turns into ice, the volume is increased by about 9 percent, and simultaneously, the ice expansion stress of about 200MPa is generated, the stress value is usually larger than the initial strength value formed in the cement stone, so that the concrete is damaged by freezing to different degrees, such as the occurrence of coarse pores, frost heaving and early cracking, the microstructure and the mechanical property of the concrete can not be completely recovered even if the concrete is cured at normal temperature, and the service function and the service life of the concrete are obviously reduced.
At present, the early-stage freezing of concrete can be observed through appearance, and if ice lines and more ice residues exist, the early-stage freezing of concrete can be preliminarily inferred; through a resiliometer, the strength of the frozen concrete is low, the rebound value is low, and the bouncing sound is dull, otherwise, the strength is high, and the bouncing sound is crisp; finally, coring the concrete and testing the compressive strength. Although the former two methods are simple and easy to implement, the initial judgment can only be made on the freezing condition of the concrete surface layer, but for the coring method, the length of the concrete coring depends on equipment parameters, a concrete sample with a specified length is intercepted after coring, subsequent tests are carried out, the core-taking machine, a pressure testing machine and a cutting and grinding test piece device are required to be matched to complete the core-taking, the pressure testing machine and the cutting and grinding test piece device on a construction site in winter, the processing procedure is complex, the consumed time is long, the efficiency is low, the accuracy is poor, and the evaluation on the freezing damage degree of various concrete member sizes cannot be carried out, so that a monitoring device for rapidly evaluating the freezing degree of the concrete in real time is urgently required to be constructed in winter, and the construction quality of concrete projects.
Disclosure of Invention
The utility model aims at providing a concrete process monitoring devices that freezes to solve present concrete and receive the degree of freezing to detect the problem that is influenced by the component size, the degree of difficulty is big, inefficiency, the degree of accuracy is poor and leads to civil engineering construction quality control to be difficult to guarantee.
The utility model discloses a solve the technical scheme that above-mentioned technical problem took and be:
the utility model provides a concrete degree detection device that freezes, including the locating rack, first fixed plate, second fixed plate and a plurality of measuring probe, vertical first fixed plate and the second fixed plate of being provided with side by side in the locating rack, first fixed plate and second fixed plate are the plate body that flexible portion and stereoplasm portion formed in turn, first fixed plate and second fixed plate all are connected with the locating rack through flexible portion, a plurality of measuring probe are from last to setting gradually between first fixed plate and second fixed plate down, every measuring probe is connected with the stereoplasm portion of first fixed plate and the stereoplasm portion of second fixed plate respectively mutually, every measuring probe includes the sleeve pipe, film and displacement sensor, the intraductal film that is provided with of cover, be provided with displacement sensor on the film.
As a preferable scheme: the structure of first fixed plate is the same with the structure of second fixed plate, and first fixed plate includes a plurality of hard boards and a plurality of flexbile plate, and a plurality of hard boards and a plurality of flexbile plate set up in turn and make as an organic wholely, and every hard board is porose along its thickness direction processing.
As a preferable scheme: two ends of the bottom sheet are respectively connected with the first fixing plate and the second fixing plate through two connecting wire ropes, one end of the bottom sheet is connected with the hole of the hard plate in the first fixing plate through one connecting wire rope, and the other end of the bottom sheet is connected with the hole of the hard plate in the second fixing plate through the other connecting wire rope.
As a preferable scheme: the outer end of each hole is correspondingly provided with a clamping device, and the clamping devices are matched with the end parts of the connecting wires.
As a preferable scheme: the displacement sensor is a strain gauge and is provided with a strain acquisition instrument in a matching way.
As a preferable scheme: the connecting wire rope is a steel wire.
The utility model discloses following beneficial effect has for prior art:
1. the utility model discloses a mutually support between locating rack, first fixed plate, second fixed plate and a plurality of measuring probe and realize that the concrete receives the degree of freezing, freezes speed and the detection of the degree of depth of freezing, and the acquisition mode is simple direct, is favorable to the early degree of freezing of winter construction concrete to make comprehensive evaluation.
2. The utility model discloses a structural design is simple, deducts outside this common instrument of strain acquisition appearance, and its cost of manufacture can control 300 yuan within ranges.
3. The utility model discloses the testing process of realization can make quantitative evaluation to the freezing speed of concrete and the degree of depth that freezes, and the evaluation result is stable and reliable through experimental verification.
4. The utility model discloses the environment that is suitable for is multiple not restricted, not only can be applicable to the laboratory and detect the use, still is applicable to the job site and detects.
Drawings
Fig. 1 is a schematic perspective view of the present invention;
fig. 2 is a front view of the first fixing plate;
FIG. 3 is a front view schematic of the measurement probe;
FIG. 4 is a schematic side view of the attachment between the plate and the position sensor;
FIG. 5 is a perspective view of the clamping device;
FIG. 6 is a line graph of freeze deformation at different depth locations in concrete over time;
FIG. 7 is a line graph of the rate of frost deformation at different depth locations in concrete over time;
fig. 8 is a schematic view of the three-dimensional structure of the thin tube with protection and isolation of the present invention.
In the figure, 1-a spacer; 1-1-cross bar; 1-2-column; 2-a first fixing plate; 2-1-hard board; 2-2-flexible sheet; 3-a second fixing plate; 4-measuring the probe; 4-1-cannula; 4-2-negative; 4-3-displacement sensor; 5-hole; 6-connecting a silk rope; 7-a clamping device; 7-1-chuck; 7-2-wire-forming disk; 7-3-a second via; 7-4-winding slot; 7-5-a gap; 7-6-wrapping posts; 8-protective isolation tubule.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not relevant to the present invention are omitted.
The first embodiment is as follows: the embodiment is described with reference to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7 and fig. 8, and includes a positioning frame 1, a first fixing plate 2, a second fixing plate 3 and a plurality of measuring probes 4, the positioning frame 1 is vertically provided with the first fixing plate 2 and the second fixing plate 3 in parallel, the first fixing plate 2 and the second fixing plate 3 are both plate bodies formed by alternately forming a flexible portion and a hard portion, the first fixing plate 2 and the second fixing plate 3 are both connected with the positioning frame 1 through the flexible portion, the plurality of measuring probes 4 are sequentially arranged between the first fixing plate 2 and the second fixing plate 3 from top to bottom, each measuring probe 4 is respectively connected with the hard portion of the first fixing plate 2 and the hard portion of the second fixing plate 3, each measuring probe 4 includes a sleeve 4-1, a base plate 4-2 and a displacement sensor 4-3, the base plate 4-2 is arranged in the sleeve 4-1, the bottom plate 4-2 is provided with a displacement sensor 4-3.
Further, first fixed plate 2 is connected with locating rack 1 through flexible portion, and the purpose can enough ensure the location effect of first fixed plate 2 on locating rack 1, can also ensure that first fixed plate 2 does not receive locating rack 1's restriction and influence the removal under the concrete frost heaving state, makes first fixed plate 2 can realize unrestricted fine motion, is favorable to promoting the utility model discloses the accuracy of detection.
Furthermore, the positioning frame 1 is a rectangular frame body and comprises two single supporting frames, the two single supporting frames are arranged in parallel, each single supporting frame comprises a cross rod 1-1 and two stand columns 1-2, the two stand columns 1-2 are vertically arranged in parallel, and the cross rod 1-1 is horizontally arranged between the two stand columns 1-2. Two ends of the cross bar 1-1 are respectively and fixedly connected to the two upright posts 1-2.
Further, the locating rack 1 is a rack body made of metal materials, the single support frames are formed by binding reinforcing steel bars, the diameter range of the reinforcing steel bars is 16-20 cm, and the distance between the two single support frames is 40-80 cm.
Furthermore, the positioning frame 1 connecting the first fixing plate 2 and the second fixing plate 3 is placed in the concrete and exposed out of the surface of the concrete, so as to play a positioning role.
Furthermore, the arrangement position of the cross rod 1-1 has the effect of enhancing the connection strength between the two upright posts 1-2 and also has the marking effect, the arrangement position of the cross rod 1-1 has the boundary position, the corresponding upright post 1-2 part is the part exposed out of the concrete, the size of the part exposed out of the concrete surface is 10cm, and the purpose of exposing out of the concrete is to mark the distance between the two upright posts 1-2.
Furthermore, the measuring probe 4 is a sleeve type probe, which can be buried deep in concrete and can ensure that the service performance is not interfered.
Furthermore, the displacement sensor 4-3 is a strain gauge of the existing product, and the strain gauge is BA120-3AA150 (11) -Q200.
The second embodiment is as follows: in this embodiment, which is a further limitation of the first embodiment, two single support frames are pre-installed in the precast concrete area, and are connected with each other by a transverse support member.
Furthermore, two ends of the transverse supporting piece are respectively fixedly connected with the two single supporting frames.
Further, the transverse supporting piece is a rod body.
The third concrete implementation mode: in this embodiment, which is a further limitation of the first or second embodiment, the first fixing plate 2 has the same structure as the second fixing plate 3, the first fixing plate 2 includes a plurality of hard plates 2-1 and a plurality of flexible plates 2-2, the plurality of hard plates 2-1 and the plurality of flexible plates 2-2 are alternately arranged to be integrated, and each of the hard plates 2-1 is provided with a hole 5 in the thickness direction thereof.
Further, the hard plate 2-1 is preferably a steel plate.
Further, the flexible board 2-2 is preferably a flexible rubber board.
When the concrete is frozen and deformed, one hard plate 2-1 is displaced, and the flexible plate 2-2 can play a role in buffering, so that the displacement of the adjacent hard plate 2-1 is not influenced, and the detection accuracy is ensured.
The fourth concrete implementation mode: in this embodiment, which is a further limitation of the first, second or third embodiment, two ends of the bottom sheet 4-2 are respectively connected with the first fixing plate 2 and the second fixing plate 3 through two connecting wires 6, one end of the bottom sheet 4-2 is connected with the hole 5 of the hard plate 2-1 in the first fixing plate 2 through one of the connecting wires 6, and the other end of the bottom sheet 4-2 is connected with the hole 5 of the hard plate 2-1 in the second fixing plate 3 through the other connecting wire 6.
Further, both the connecting wires 6 are in a taut state during the measurement.
The fifth concrete implementation mode: the present embodiment is further limited to the first, second, third or fourth embodiments, the outer end of each hole 5 is correspondingly provided with a clamping device 7, the clamping device 7 is arranged to match with the end of the connecting wire rope 6, and the clamping device 7 is arranged to fix the initial position of the connecting wire rope 6.
Further, the connecting wire rope 6 is a non-elastic wire rope.
Furthermore, the clamping device 7 comprises a chuck 7-1 and a wire winding disc 7-2, the wire winding disc 7-2 is coaxially arranged on one side of the chuck 7-1, a first through hole is processed on the chuck 7-1, a second through hole 7-3 is processed on the wire winding disc 7-2, the first through hole is communicated with the second through hole 7-3 to form a channel matched with the connecting wire rope 6, and a wire winding groove 7-4 is processed on the outer circumferential end face of the wire winding disc 7-2 to provide a wire winding position for the connecting wire rope 6 to wind and position the connecting wire rope 6 with an excessive length.
Further, the first through hole and the second through hole 7-3 are coaxially arranged.
Furthermore, a gap 7-5 is processed on the wire winding disc 7-2, and a winding post 7-6 is arranged in the gap 7-5. The appropriate number of gaps 7-5 is selected and processed according to the outer diameter of the wire winding disc 7-2. The gap 7-5 provides a stable position for the connecting wire rope 6 to pass in and out of the winding groove 7-4.
The installation process of the connecting wire rope 6 in this embodiment is as follows:
one end of the connecting wire rope 6 is fixedly connected to the bottom sheet 4-2 in the sleeve 4-1, and in order to enable the connecting wire rope 6 to be in a tight state, the other end of the connecting wire rope 6 sequentially penetrates through the first through hole and the second through hole 7-3, is wound in the winding groove 7-4 and then is knotted and fixed.
The other positioning mode of the end part of the connecting wire rope 6 is a plurality of positioning modes, so that the tightening effect of the connecting wire rope 6 is more accurate, and the specific operation is that the other end of the connecting wire rope 6 is wound on the winding groove 7-4 for a plurality of circles, penetrates out of the notch 7-5 and is wound on the winding post 7-6 to realize secondary positioning.
The sixth specific implementation mode: the embodiment is further limited by the first, second, third, fourth or fifth embodiment, the displacement sensor 4-3 is a strain gauge, and the displacement sensor 4-3 is provided with a strain data acquisition instrument in a matching manner. The strain data acquisition instrument is connected with each displacement sensor 4-3 and arranged on the ground surface, so that the numerical value of each displacement sensor 4-3 can be collected in a centralized manner. In winter construction, along with the reduction of ambient temperature, the concrete cools down from the top layer to inside gradually, and when the water in the concrete freezes and expands, the concrete takes place frost heaving and warp, and displacement sensor 4-3's registration change value just can obtain the early frost heaving change of concrete, warp through the frost heaving of monitoring different degree of depth in the concrete member, just can obtain whole member concrete degree of freezing. The strain data acquisition instrument is an existing device and is a strain acquisition instrument of JM 3813.
Furthermore, the surface of the strain data acquisition instrument is provided with a heating insulation sleeve for wrapping, so that the anti-freezing effect of the strain data acquisition instrument is enhanced.
The seventh embodiment: this embodiment is further limited to the first, second, third, fourth, fifth or sixth embodiment, and the connecting wire 6 is preferably a steel wire. The diameter of the steel wire is 0.4cm, and the steel wire is a structure made of light high-strength alloy materials.
Further, the base sheet 4-2 is preferably a steel sheet having a rectangular shape, and the preferred size of the steel sheet is 1.5cm × 3 cm.
Further, the steel sheet is a sheet body made of light high-strength alloy material which is the same as the steel wire.
The specific implementation mode is eight: in this embodiment, the shape of the hard plate 2-1 is short and wide, and the shape of the flexible plate 2-2 is long and narrow. The length of the flexible plate 2-2 is 2-4 cm longer than that of the hard plate 2-1.
Furthermore, the optimal size relation between the width of the flexible board 2-2 and the width of the hard board 2-1 is that the width of the flexible board 2-2 is not less than one fourth of the width of the hard board 2-1, the size relation set in such a way can ensure that the flexible board 2-2 does not influence the movement of the hard board 2-1 while playing a positioning connection role, and the monitoring scheme of the concrete freezing depth can be designed conveniently by utilizing the size of the hard board 2-1.
The specific implementation method nine: the present embodiment is described with reference to fig. 1, 2, 3, 4, 5, 6, and 7, and the detection process implemented by the present measurement apparatus is as follows:
installing a positioning frame 1 in a construction area to be cast with concrete, vertically arranging a first fixing plate 2 and a second fixing plate 3 at two ends of the positioning frame 1 respectively, arranging a plurality of measuring probes 4 between the first fixing plate 2 and the second fixing plate 3, and realizing clamping treatment on the plurality of measuring probes 4 by matching a connecting wire rope 6 and a clamping device 7;
filling concrete in the construction area of the concrete, closely tamping, and recording the initial reading D of the displacement sensor 4-30；
Recording the readings D of the displacement sensor 4-3 with different embedding depths at each age along with the extension of the maintenance age and the reduction of the ambient temperature, and subtracting the initial readings D of the displacement sensor 4-30，D-D0Namely the frozen deformation of the concrete, and the freezing speed and the freezing depth of the concrete can be obtained by calculating the change of the frozen deformation of the concrete along with the age.
Further, the temperature coefficient of deformation of connecting silk rope 6, film 4-2 and displacement sensor 4-3 is a fixed constant, deducts when the frost heaving warp calculation as the systematic error, so handle and can effectively reduce the error, improve the utility model discloses a detection precision.
Other steps and structural connections not mentioned are the same as those of embodiments one, two, three, four, five, six, seven, eight, or nine.
The detailed implementation mode is ten: in this embodiment, any time after the completion of concrete pouring can be measured, and the time points can be used as the key time points such as initial setting, final setting, and 1 day, 2 days, 3 days, 7 days after the completion of concrete pouring, and the frozen deformation of the concrete needs to be continuously monitored when severe weather such as cold flow is encountered.
The concrete implementation mode eleven: in this embodiment, the freezing speed of the concrete is C ═ Δ D/Δ t, and Δ D is the frost heave deformation of the concrete at a time interval of Δ t. For a certain pouring position in the engineering, the frost heaving deformation of the concrete after pouring is respectively delta D when t is 0h, 8h, 12h, 24h, 32h, 40h, 48h and … 168h8h、ΔD12h、…ΔD168The freezing speed of the concrete in 8h, 12h, 24h, 32h, 40h, 48h and … 168h from the pouring time is C8h＝ΔD8h/8；C12h＝ΔD12h/12；C48h＝ΔD48h/48；C168h＝ΔD168hA/168; aiming at the interior disorder from the exterior in the engineeringWith the position of pouring, the concrete that does not receive the frost shows the shrink characteristic, and its deformation value is the negative value usually, along with ambient temperature's reduction, the frost heaving deformation is from the surface to the inside constantly increases, and the sudden change takes place for the deformation value, when becoming the positive value, takes place big frost heaving deformation promptly, and this position is the freezing degree of depth of concrete promptly. Differentiating the curve of the concrete frost heaving deformation along with the change of time to obtain a differential curve, wherein the differential curve can be obtained by carrying out primary differentiation on the frost heaving deformation-time curve by Origin software or other existing related software, and C is dD/dt, namely the change of the frost heaving deformation rate along with the time, so that the time of the maximum frost heaving deformation rate of the concrete can be obtained.
The specific implementation mode twelve: in this embodiment, which is a further limitation of the first or ninth embodiment, in the detection apparatus, the sleeve 4-1 is a hard tube body, the selected material is a light smooth aluminum alloy material, the length and the diameter of the sleeve 4-1 are adjusted according to the property of concrete, the length of the sleeve 4-1 ranges from 3cm to 5cm, and the outer diameter of the sleeve 4-1 ranges from 2cm to 4 cm.
Further, the displacement sensor 4-3 is fixedly arranged on the bottom plate 4-2, a commercially available strain gauge can be selected as the displacement sensor 4-3, and a lead wire with a power supply is led out of the sleeve.
Further, the first fixing plate 2 is a square plate, the side length of the square plate is 5 cm-8 cm, the square plate is made of light high-strength alloy materials, the center of the first fixing plate 2 is a processing position of a hole 5, and the diameter of the hole 5 is 0.5 cm.
Furthermore, the flexible plate 2-2 is used for connecting two adjacent hard plates 2-1, and the flexible plate 2-2 is made of elastic high polymer materials, particularly a rubber plate, and plays a role in buffering the deformation of the fixing plate.
Furthermore, two ends of each sleeve 4-1 are respectively provided with a protective isolation thin tube 8, the connecting wire ropes 6 at two ends of the bottom sheet 4-2 are respectively and correspondingly provided with a protective isolation thin tube 8 in a penetrating manner, and the protective isolation thin tubes 8 are used for providing protective channels for the connecting wire ropes 6 and preventing the connecting wire ropes 6 from being bonded with concrete into a whole to limit the movement of the first fixing plate 2 and the second fixing plate 3.
Further, the protective isolation tubule 8 is a rigid plastic pipe body.
The utility model discloses a detection device's installation and testing process:
the positioning frame 1 is arranged in a construction area in advance before concrete pouring and used for suspending the first fixing plate 2 and the second fixing plate 3, the positioning frame 1 is made of metal materials, a plurality of measuring probes 4 are arranged between the first fixing plate 2 and the second fixing plate 3, and a connecting wire rope 6 connected with the auxiliary measuring probes 4 is ensured to be in a tightening position and then enters a concrete pouring process. After concrete is poured, when the concrete is subjected to freezing deformation and expands, the concrete between the first fixing plate 2 and the second fixing plate 3 expands to pull the connecting wire rope 6 and the bottom plate 4-2, the displacement sensor 4-3 pasted on the bottom plate 4-2 is pulled to generate deformation, the change of the reading finally displayed on the strain data acquisition instrument by the displacement sensor 4-3 is the freezing expansion deformation of the concrete, the freezing deformation of the concrete at different depths can reflect the freezing degree of the concrete, the freezing depth or area of the concrete can be determined according to the position where the freezing deformation does not occur, and the freezing rate of the concrete can be obtained according to the change of the freezing deformation of the concrete along with the change of time.
The size setting and the number of the hard plate 2-1 and the flexible plate 2-2 can be determined according to the requirement of test precision, generally, the hard plate 2-1 can be selected to be a square plate with the side length of 5 cm-8 cm, and the flexible plate 2-2 can be selected to be a rectangular plate with the length of 7 cm-10 cm and the width of 2 cm-3 cm.
Combine the utility model discloses well detection device's beneficial effect explains following embodiment:
the first embodiment is as follows: the present example is described with reference to FIGS. 6 and 7, wherein the ambient temperature of the present example is-20 deg.C, the concrete mixing ratio is C30, and the cement consumption is 300kg/m3The fly ash is 80kg/m3Sand of 720kg/m31080kg/m of coarse aggregate3The water consumption is 190kg/m3The water reducing agent accounts for 0.5 percent of the cementing material, the slump is 180mm, the first fixing plate 2 is connected with three hard plates 2-1 and three flexible plates 2-2, the three hard plates 2-1 and the three flexible plates 2-2 on the second fixing plate 3 are symmetrically arranged corresponding to the arrangement modes of the hard plates 2-1 and the flexible plates 2-2 of the first fixing plate 2, and the first fixing plate 2 and the second fixing plate 3 are squareThe connecting wire rope 6 is a high-strength high-elasticity-modulus steel wire, the diameter of the steel wire is 0.4cm, the bottom piece 4-2 is a rectangle with the size of 1.5cm × cm, and the distance between the first fixing plate 2 and the second fixing plate 3 is 400 mm.
The specific operation process when the detection device is used for detection is as follows:
the method comprises the following steps: a positioning frame 1 is installed in a construction area where concrete is to be poured, a first group of fixing plates 2 and a second group of fixing plates 3 are arranged on the positioning frame 1, a connecting wire rope 6, a bottom plate 4-2 and a displacement sensor 4-3 are connected, and clamping devices 7 are used for clamping the outer sides of the first group of fixing plates 2 and the second group of fixing plates 3 respectively.
Step two: filling concrete, inserting and tamping, recording initial readings D of three displacement sensors 4-3 between six hard plates 2-1 opposite to each other in pairs01、D02、D03；
Step three: along with the extension of the maintenance age and the reduction of the environmental temperature, the strain acquisition instrument automatically records different embedding depths of concrete in the time period t of 0-120 hours, the displacement sensors 4-3 are respectively arranged as a point A, a point B and a point C, wherein the depth of the point A from the surface of the concrete is 5cm, the depth of the point B from the surface of the concrete is 16cm, the depth of the point C from the surface of the concrete is 27cm, and the readings of the three displacement sensors 4-3 are respectively D1、D2、D3Three displacement sensors 4-3 each subtract its own initial reading D0，D-D0Namely the frozen deformation of the concrete and the frozen deformation D-D of the concrete at different depths0The size of the concrete can reflect the frozen degree and the frozen depth of the concrete, and the change (D-D) of the frozen deformation of the concrete along with the age is calculated0) The freezing speed of the concrete can be known by/t. When the concrete is poured for 10 hours, the frost-resisting deformation of A, B, C points is 125 mu, 45 mu and 0 mu respectively, the frost-resisting deformation speed of A, B, C points is 12.5 mu/h, 4.5 mu/h and 0 mu/h, and the frost-swelling deformation of C point is 0, which indicates that the concrete is frozen but not yetReaching 27cm, and at 11 hours and 20 minutes, the frost heave deformation at point C becomes positive and frost heave starts, at which point the concrete has a freeze depth of 27 cm.
As shown in fig. 6, the above test results also show the evolution process of concrete freezing more clearly by drawing images, and it is illustrated by fig. 6 that although the points a, B and C are at different depths, the difference of the frost heaving degree is large in the time period of 0 to 40 hours, and the frost heaving degree tends to be uniform after 50 hours. Fig. 7 illustrates that, although the points a, B, and C are at different depths, the frost heaving degrees are different in the time period of 0 to 40 hours, but the deformation process is similar, and the frost heaving degrees tend to be the same after 50 hours. Differentiating the curve of the concrete frost heaving deformation changing along with the time to obtain a differential curve, as shown in fig. 7, namely obtaining the change of the frost heaving deformation change rate along with the time, wherein the time of the maximum frost heaving deformation change rate of the concrete at the point A, the point B and the point C can be known to be 15 hours, 26 hours and 34 hours.
Therefore, the utility model discloses a winter construction is quick to be assessed concrete degree of freezing in real time and is provided reliable and favorable data reference, provides the guarantee for guaranteeing cold areas concrete engineering's construction quality better.
Claims (6)
1. The utility model provides a concrete degree detection device that freezes which characterized in that: comprises a positioning frame (1), a first fixing plate (2), a second fixing plate (3) and a plurality of measuring probes (4), wherein the first fixing plate (2) and the second fixing plate (3) are vertically arranged in the positioning frame (1) in parallel, the first fixing plate (2) and the second fixing plate (3) are plate bodies formed by alternately forming a flexible part and a hard part, the first fixing plate (2) and the second fixing plate (3) are both connected with the positioning frame (1) through the flexible part, the plurality of measuring probes (4) are sequentially arranged between the first fixing plate (2) and the second fixing plate (3) from top to bottom, each measuring probe (4) is respectively connected with the hard part of the first fixing plate (2) and the hard part of the second fixing plate (3), each measuring probe (4) comprises a sleeve (4-1), a bottom plate (4-2) and a displacement sensor (4-3), a bottom plate (4-2) is arranged in the sleeve (4-1), and a displacement sensor (4-3) is arranged on the bottom plate (4-2).
2. The concrete freezing degree detection device according to claim 1, wherein: the structure of the first fixing plate (2) is the same as that of the second fixing plate (3), the first fixing plate (2) comprises a plurality of hard plates (2-1) and a plurality of flexible plates (2-2), the hard plates (2-1) and the flexible plates (2-2) are alternately arranged and manufactured into a whole, and each hard plate (2-1) is provided with a hole (5) along the thickness direction.
3. The concrete freezing degree detection device according to claim 2, wherein: two ends of the bottom sheet (4-2) are respectively connected with the first fixing plate (2) and the second fixing plate (3) through two connecting wire ropes (6), one end of the bottom sheet (4-2) is connected with a hole (5) of a hard plate (2-1) in the first fixing plate (2) through one connecting wire rope (6), and the other end of the bottom sheet (4-2) is connected with the hole (5) of the hard plate (2-1) in the second fixing plate (3) through the other connecting wire rope (6).
4. A concrete freezing degree detecting device according to claim 2 or 3, wherein: the outer end of each hole (5) is correspondingly provided with a clamping device (7), and the clamping devices (7) are matched with the end parts of the connecting wire ropes (6).
5. The concrete freezing degree detection device according to claim 1, wherein: the displacement sensor (4-3) is a strain gauge, and the displacement sensor (4-3) is provided with a strain acquisition instrument in a matching way.
6. The concrete freezing degree detection device according to claim 3, wherein: the connecting wire rope (6) is a steel wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922425162.0U CN211292670U (en) | 2019-12-27 | 2019-12-27 | Concrete degree detection device that freezes |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922425162.0U CN211292670U (en) | 2019-12-27 | 2019-12-27 | Concrete degree detection device that freezes |
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| Publication Number | Publication Date |
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| CN211292670U true CN211292670U (en) | 2020-08-18 |
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| CN110907488A (en) * | 2019-12-27 | 2020-03-24 | 哈尔滨工业大学 | Concrete freezing degree detection device and detection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110907488A (en) * | 2019-12-27 | 2020-03-24 | 哈尔滨工业大学 | Concrete freezing degree detection device and detection method thereof |
| CN110907488B (en) * | 2019-12-27 | 2024-05-31 | 哈尔滨工业大学 | Concrete freezing degree detection device and detection method thereof |
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