CN115855799A - Simple device for testing friction coefficient between newly-poured concrete and template - Google Patents
Simple device for testing friction coefficient between newly-poured concrete and template Download PDFInfo
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- CN115855799A CN115855799A CN202211677226.6A CN202211677226A CN115855799A CN 115855799 A CN115855799 A CN 115855799A CN 202211677226 A CN202211677226 A CN 202211677226A CN 115855799 A CN115855799 A CN 115855799A
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Abstract
The invention discloses a simple device for testing the friction coefficient between newly poured concrete and a template, which comprises: the experiment assembly is used for containing concrete to be detected and comprises a barrel and a barrel bottom, the barrel is of a tubular structure, and the bottom surface of the barrel is fixedly connected with the top surface of the barrel bottom in a sealing manner; the bottom end of the pressurizing unit penetrates through the self-balancing assembly and is in sealed sliding connection with the top end of the side wall of the inner cavity of the barrel, and two ends of the self-balancing assembly are fixedly connected with the top end of the outer side surface of the barrel; the testing mechanism comprises a torque device and a testing component, the torque device is used for measuring received torque, the torque device is detachably connected with the top end of the testing component, and the testing component penetrates through the pressurizing unit and is abutted against the top surface of the barrel bottom. The method can realize the measurement of the friction coefficient between the newly poured concrete and the template and the change rule of the friction coefficient with time at any time and any place in a construction site or a laboratory according to requirements.
Description
Technical Field
The invention relates to the technical field of development and application of foundation test devices in the field of civil engineering construction, in particular to a simple device for testing a friction coefficient between newly poured concrete and a template.
Background
At present, concrete is still the most common building material in the field of civil engineering, and whether the design of a template for pouring the concrete is reasonable or not only relates to the construction cost and the manufacturing cost of engineering, but also influences the engineering quality and the construction safety. The calculation of the side pressure of the template is the premise of the design of the concrete template, most of the calculation formulas of the side pressure of the template given by the current specifications are semi-empirical semi-theoretical formulas obtained by fitting test data, and the formulas based on the fitting of the test data before half a century cannot meet the current engineering requirements along with the change of the performance indexes of the concrete and the on-site pouring mode. Therefore, a new concrete formwork side pressure calculation theory based on a classical mechanical model and a corresponding calculation model need to be provided, and a friction coefficient between new poured concrete and a formwork is a key basic parameter of the calculation model, but no related testing technology and a related device exist at present.
Disclosure of Invention
The invention aims to provide a simple device for testing the friction coefficient between newly-poured concrete and a template, which is used for solving the problems in the prior art and can realize the measurement of the friction coefficient between the newly-poured concrete and the template and the change rule of the friction coefficient with time at any time and any place in a construction site or a laboratory according to requirements.
In order to achieve the purpose, the invention provides the following scheme:
the utility model provides a simple and easy device of coefficient of friction test between new concreting and template, includes:
the experimental component is used for containing concrete to be detected and comprises a barrel and a barrel bottom, wherein the barrel is of a tubular structure, and the bottom surface of the barrel is fixedly connected with the top surface of the barrel bottom in a sealing manner;
the pressurizing mechanism is used for applying pre-pressure to concrete to be detected, and comprises a self-balancing assembly and a pressurizing unit, wherein the bottom end of the pressurizing unit penetrates through the self-balancing assembly and is in sealed sliding connection with the top end of the side wall of the inner cavity of the barrel, and the two ends of the self-balancing assembly are fixedly connected with the top end of the outer side surface of the barrel;
the testing mechanism is used for testing data of the friction coefficient of the concrete to be tested and the template and comprises a torque device and a testing component, the torque device is used for measuring the received torque, the torque device is detachably connected with the top end of the testing component, and the testing component penetrates through the pressurizing unit and is abutted to the top surface of the barrel bottom.
Preferably, the self-balancing subassembly includes pressurization roof beam and two pressurization pull rods, the both ends of pressurization roof beam respectively with pressurization pull rod top can be dismantled and be connected, the bottom of pressurization pull rod with cask lateral surface fixed connection, pressurization unit bottom run through the pressurization roof beam and with cask cavity lateral wall top is sealed sliding connection.
Preferably, the pressurizing unit comprises a tetrafluoro sliding sheet, a pressurizing screw and a pressurizing plate, the pressurizing screw penetrates through the pressurizing beam and is in threaded connection with the pressurizing beam, the bottom end of the pressurizing screw is fixedly connected with the top surface of the pressurizing plate through the tetrafluoro sliding sheet, a sealing rubber ring is embedded in the side surface of the pressurizing plate, and the pressurizing plate is in sealing sliding connection with the side wall of the inner cavity of the drum through the sealing rubber ring; the test assembly penetrates through the pressurizing screw, the tetrafluoro slide sheet and the pressurizing plate in sequence and is connected with the center of the pressurizing plate in a sealing and sliding mode.
Preferably, the testing assembly comprises a torsion bar and a quadrangular sleeve, the quadrangular sleeve is sleeved and fixedly connected to the middle of the torsion bar, a friction plate penetrates through the quadrangular sleeve, and the friction plate is connected with the quadrangular sleeve in a sliding manner; the torsion bar penetrates through the pressurizing screw, the PTFE slip sheet and the pressurizing plate in sequence and is connected with the center of the pressurizing plate in a sealing and sliding manner, and the bottom end of the torsion bar is in contact with the top surface of the barrel bottom and is in rotating connection with the top surface of the barrel bottom.
Preferably, the friction plate is made of the same material as the template actually used on site.
Preferably, a groove is formed in the center of the top surface of the barrel bottom, and the bottom end of the torsion bar is matched with and slidably connected with the groove.
Preferably, a clamping joint for facilitating clamping of the torque converter is fixedly connected to the top end of the torsion bar.
The invention has the following technical effects:
according to the invention, the friction plate to be tested is placed in the concrete of the barrel, and the concrete is pressurized by the sealed pressurizing unit, so that certain pre-pressure is applied to the friction plate by the concrete, and the friction coefficient test of the friction plate in different concrete environments is realized. The device can simulate the dynamic and static friction coefficients between newly cast concrete and the template at different concrete casting heights and different moments, and test the change rule of the friction coefficient between the newly cast concrete and the template along with time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic front view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
FIG. 3 is a schematic structural view in elevation of the drum of the present invention after being filled with concrete;
wherein, 1, a barrel; 2. a barrel bottom; 3. a compression beam; 4. a compression pull rod; 5. a tetrafluoro slide sheet; 6. a pressurizing screw; 7. a pressurizing plate; 8. sealing the rubber ring; 9. a torsion bar; 10. a quadrangular sleeve; 11. a friction plate; 12. a clamping head; 13. a torsion machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
A simple apparatus for testing the coefficient of friction between newly cast concrete and a form as shown in fig. 1 to 3, comprising:
the experimental component is used for containing concrete to be detected, the experimental component comprises a barrel 1 and a barrel bottom 2, the barrel 1 is of a tubular structure, and the bottom surface of the barrel 1 is fixedly connected with the top surface of the barrel bottom 2 in a sealing manner;
the pressurizing mechanism is used for applying pre-pressure to concrete to be detected and comprises a self-balancing assembly and a pressurizing unit, the bottom end of the pressurizing unit penetrates through the self-balancing assembly and is in sealed sliding connection with the top end of the side wall of the inner cavity of the barrel 1, and the two ends of the self-balancing assembly are fixedly connected with the top end of the outer side surface of the barrel 1;
the testing mechanism is used for testing the friction coefficient of the concrete to be detected and the template, the testing mechanism comprises a torque device 13 and a testing component, the torque device 13 is used for measuring the received torque, the torque device 13 is detachably connected with the top end of the testing component, and the testing component penetrates through the pressurizing unit and is abutted against the top surface of the barrel bottom 2.
Further, the opening size of the torque converter 13 can be adjusted to meet the requirements of twisting different members, and the torque converter has a function of measuring torque, which is the prior art and will not be described herein again.
According to the invention, the friction plate 11 to be tested is placed in the concrete of the barrel 1, and the concrete is pressurized by the sealed pressurizing unit, so that a certain pre-pressure is applied to the friction plate 11 by the concrete, and the friction coefficient test of the friction plate 11 in different concrete environments is realized.
Further optimization scheme, the self-balancing subassembly includes pressurization roof beam 3 and two pressurization pull rods 4, and the both ends of pressurization roof beam 3 can be dismantled with 4 tops of pressurization pull rods respectively and be connected, and 1 lateral surface fixed connection of bottom and cask of pressurization pull rod 4, pressurization unit bottom run through pressurization roof beam 3 and with the sealed sliding connection in cask 1 inner chamber lateral wall top, utilize pressurization roof beam 3 to provide the support of counter force for the pressurization unit. The pressurizing unit comprises a PTFE sliding sheet 5, a pressurizing screw rod 6 and a pressurizing plate 7, the pressurizing screw rod 6 penetrates through the pressurizing beam 3 and is in threaded connection with the pressurizing beam 3, the bottom end of the pressurizing screw rod 6 is fixedly connected with the top surface of the pressurizing plate 7 through the PTFE sliding sheet 5, a sealing rubber ring 8 is embedded in the side surface of the pressurizing plate 7, a through hole is formed in the center of the pressurizing plate 7, the sealing rubber ring 8 is also embedded in the through hole, and the pressurizing plate 7 is in sealing sliding connection with the side wall of the inner cavity of the barrel 1 through the sealing rubber ring 8; the test assembly penetrates through the pressurizing screw 6, the PTFE slide sheet 5 and the pressurizing plate 7 in sequence and is in sealed sliding connection with the center of the pressurizing plate 7, the pressurizing plate 7 can be in sealed sliding connection with the inner wall of the barrel 1, and certain pre-pressure is applied to concrete arranged below the pressurizing plate 7 by the pressurizing of the pressurizing screw 6.
According to a further optimized scheme, the testing assembly comprises a torsion bar 9 and a quadrangular sleeve 10, the quadrangular sleeve 10 is sleeved and fixedly connected to the middle of the torsion bar 9, a friction plate 11 penetrates through the quadrangular sleeve 10, and the friction plate 11 is in sliding connection with the quadrangular sleeve 10; the torsion bar 9 sequentially penetrates through the pressurizing screw 6, the PTFE sliding sheet 5 and the pressurizing plate 7, and the torsion bar 9 penetrates through a through hole in the middle of the pressurizing plate 7 and is connected with the center of the pressurizing plate 7 in a sealing and sliding manner through the sealing rubber ring 8; the center of the top surface of the barrel bottom 2 is provided with a groove, the bottom end of the torsion bar 9 is matched with and slidably connected with the groove, and the groove plays a role in limiting the rotation of the torsion bar 9 and realizes the horizontal stable rotation of the friction plate 11. The friction plate 11 is made of the same material as the template actually used on site, so that the test of the invention is completely fit for the actual application, and the detection result has more important reference value for the guidance on site. The top end of the torsion bar 9 is fixedly connected with a clamping joint 12 which is convenient for clamping a torsion device 13.
The working process of the embodiment is as follows:
(1) Preparation of a test: cleaning and wetting the barrel 1 and the barrel bottom 2, installing the torsion bar 9, then pouring lower layer concrete to the middle height position of a quadrangular sleeve 10 of the torsion bar 9, vibrating and grinding the lower layer concrete, and then installing a friction plate 11. Pouring upper concrete, vibrating, grinding and flattening, and installing a pressurizing plate 7 and two sealing rubber rings 8; then, a tetrafluoro slide 5, a pressurizing screw 6 and a pressurizing beam 3 are sequentially installed, and the pressurizing beam 3 and a pressurizing pull rod 4 are connected through bolts. Thus, the equipment installation and concrete pouring work is completed.
(2) Concrete pressurization: the pressurizing screw 6 is twisted by the torque device 13 to apply torque T y The concrete in the drum 1 is pressurized by pressing the pressurizing plate 7 downward by the pressurizing screw.
(3) And (3) testing the friction coefficient: when the pressure in the concrete reaches the design pressure of the test, the torque device 13 is utilized to screw the clamping joint 12 at the top end of the torque rod 9, and the friction plate 11 is driven to rotate in the concrete. The torque T at the start of rotation of the friction plate 11 is read j And the static friction coefficient between the newly poured concrete and the friction plate can be obtained through theoretical calculation. Reading the torque T when the friction plate 11 rotates at a constant speed d And calculating the dynamic friction coefficient between the newly poured concrete and the friction plate through theoretical calculation.
(4) The test mechanism is as follows:
(a) The torsion device 13 is used for screwing the pressurizing screw 6 to apply pressure to the pressurizing plate 7, so that the vertical compressive stress condition of the concrete at the position of the friction plate 11 caused by the pouring height of the concrete is simulated. The vertical compressive stresses acting on the upper and lower surfaces of the friction plate 11 are calculated as follows:
in the formula: p is the vertical prestress of the friction plate position, kPa;
γ c is the heavy weight of the concrete, kN/m 3 ；
N y The pressure applied to the concrete by the pressurizing plate 7, kN;
A y m is an area passing through the pressurizing plate 7 2 ；
T y Torque applied when the pressurizing screw 6 is screwed for the torque device 13 to pressurize，kN.m；
k y The torque coefficient of the pressurizing screw 6;
d y the diameter of the pressurizing screw 6, m.
(b) The hoop horizontal compressive stress acting on the side of the friction plate 11 is calculated as follows:
P′＝K(t)·P (3)
in the formula: k (t) is the concrete side pressure reduction coefficient, K (t) = K 0 ·e -0.002t Plain concrete K 0 =0.85, self-compacting concrete K 0 ＝0.95。
(c) The static friction coefficient between the concrete and the friction plate is calculated as follows:
the coefficient of dynamic friction between the concrete and the friction plate is calculated as follows:
therefore, by adopting the invention, the dynamic and static friction coefficients between the newly poured concrete and the template under any vertical pressure (concrete pouring height) at any time can be obtained only by applying torque force on the top end of the torque rod 9 through the torque device 13 and driving the friction plate 11 to slowly convey and rotate by the torque rod 9.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. The utility model provides a simple and easy device of coefficient of friction test between new concreting and template which characterized in that includes:
the experiment assembly is used for containing concrete to be detected and comprises a barrel (1) and a barrel bottom (2), the barrel (1) is of a tubular structure, and the bottom surface of the barrel (1) is fixedly connected with the top surface of the barrel bottom (2) in a sealing manner;
the pressurizing mechanism is used for applying pre-pressure to concrete to be detected, and comprises a self-balancing assembly and a pressurizing unit, wherein the bottom end of the pressurizing unit penetrates through the self-balancing assembly and is in sealed sliding connection with the top end of the side wall of the inner cavity of the barrel (1), and the two ends of the self-balancing assembly are fixedly connected with the top end of the outer side surface of the barrel (1);
the testing mechanism is used for testing the friction coefficient of the concrete to be detected and the formwork, the testing mechanism comprises a torque device (13) and a testing component, the torque device (13) is used for measuring the received torque, the torque device (13) is detachably connected with the top end of the testing component, and the testing component penetrates through the pressurizing unit and is abutted to the top surface of the barrel bottom (2).
2. The simple device for testing the friction coefficient between the newly-poured concrete and the template according to claim 1, characterized in that: the self-balancing subassembly includes pressurization roof beam (3) and two pressurization pull rods (4), the both ends of pressurization roof beam (3) respectively with pressurization pull rod (4) top can be dismantled and be connected, the bottom of pressurization pull rod (4) with cask (1) lateral surface fixed connection, the unit bottom that pressurizes runs through pressurization roof beam (3) and with cask (1) inner chamber lateral wall top sealing sliding connection.
3. The simple device for testing the friction coefficient between the newly-poured concrete and the template according to claim 2, characterized in that: the pressurizing unit comprises a tetrafluoro sliding sheet (5), a pressurizing screw rod (6) and a pressurizing plate (7), the pressurizing screw rod (6) penetrates through the pressurizing beam (3) and is in threaded connection with the pressurizing beam (3), the bottom end of the pressurizing screw rod (6) is fixedly connected with the top surface of the pressurizing plate (7) through the tetrafluoro sliding sheet (5), a sealing rubber ring (8) is embedded in the side surface of the pressurizing plate (7), and the pressurizing plate (7) is in sealing sliding connection with the side wall of the inner cavity of the drum (1) through the sealing rubber ring (8); the test assembly penetrates through the pressurizing screw (6), the tetrafluoro slide sheet (5) and the pressurizing plate (7) in sequence and is connected with the center of the pressurizing plate (7) in a sealing and sliding mode.
4. The simple device for testing the friction coefficient between the newly-poured concrete and the template according to claim 3, is characterized in that: the testing assembly comprises a torsion bar (9) and a quadrangular sleeve (10), the quadrangular sleeve (10) is sleeved and fixedly connected to the middle of the torsion bar (9), a friction plate (11) penetrates through the quadrangular sleeve (10), and the friction plate (11) is in sliding connection with the quadrangular sleeve (10); torsion bar (9) run through in proper order pressurization screw rod (6) tetrafluoro gleitbretter (5) with pressure plate (7) and with pressure plate (7) center seal sliding connection, torsion bar (9) bottom with barrel head (2) top surface is inconsistent and rotation connection.
5. The simple device for testing the friction coefficient between the newly-poured concrete and the template according to claim 4, is characterized in that: the friction plate (11) is made of the same material as the template actually used on site.
6. The simple device for testing the friction coefficient between the newly-poured concrete and the template according to claim 4, is characterized in that: the center of the top surface of the barrel bottom (2) is provided with a groove, and the bottom end of the torsion bar (9) is matched with and in sliding connection with the groove.
7. The simple device for testing the friction coefficient between the newly-poured concrete and the template according to claim 4, characterized in that: the top rigid coupling of torsion bar (9) has the joint (12) of being convenient for torsion ware (13) joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211677226.6A CN115855799A (en) | 2022-12-26 | 2022-12-26 | Simple device for testing friction coefficient between newly-poured concrete and template |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211677226.6A CN115855799A (en) | 2022-12-26 | 2022-12-26 | Simple device for testing friction coefficient between newly-poured concrete and template |
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| Publication Number | Publication Date |
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| CN115855799A true CN115855799A (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211677226.6A Pending CN115855799A (en) | 2022-12-26 | 2022-12-26 | Simple device for testing friction coefficient between newly-poured concrete and template |
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| CN (1) | CN115855799A (en) |
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- 2022-12-26 CN CN202211677226.6A patent/CN115855799A/en active Pending
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