CN214584611U - 3D prints shear strength testing arrangement between concrete layer - Google Patents
3D prints shear strength testing arrangement between concrete layer Download PDFInfo
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- CN214584611U CN214584611U CN202120529218.1U CN202120529218U CN214584611U CN 214584611 U CN214584611 U CN 214584611U CN 202120529218 U CN202120529218 U CN 202120529218U CN 214584611 U CN214584611 U CN 214584611U
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Abstract
The utility model discloses a 3D printing concrete interlaminar shear strength testing device, which comprises a frame body consisting of a base, a left pillar, a right pillar and a crossbeam, wherein spring telescopic columns are respectively fixed in the centers of the base and the crossbeam, upper slide rails are arranged below the crossbeam and on two sides of the spring telescopic columns, and lower slide rails are arranged above the base and on two sides of the spring telescopic columns; a first vertical beam and a second vertical beam are respectively arranged on the left side and the right side of the spring telescopic column, and the first vertical beam and the second vertical beam can horizontally move on the upper sliding rail and the lower sliding rail; the spring telescopic column is connected with a shear strength testing sleeve film used for fixing a concrete test block to be tested; and a first horizontal loading system and a second horizontal loading system are arranged on one side of the first vertical beam, and a steel base plate is fixed on one side of the second vertical beam. The shear strength testing device is simple in structure and high in practicability, and when the shear strength is tested, the moment at any cross section is balanced, and the detection is accurate.
Description
Technical Field
The utility model belongs to the technical field of the test, a concrete structure testing arrangement is related to, and specifically speaking relates to a 3D prints shear strength testing arrangement between concrete layer.
Background
The 3D printing technology, also known as "additive technology", refers to a technology for generating a three-dimensional entity by continuously stacking building materials, and has achieved a lot of achievements in the fields of industrial design, aerospace, medical health and the like. In recent years, the technology has become a rapid prototyping technology which is a key research at home and abroad.
At present, the 3D printing technology mainly adopts an extrusion stacking process, that is, a cement-based material is printed through a nozzle in an extrusion device according to a preset printing program, and finally a printed concrete member is obtained. Different from traditional template pouring vibration process, 3D prints the cement-based material and continuously extrudes and pile up the in-process layer upon layer from printing the shower nozzle, introduces a certain amount of space with being difficult to avoid, can make the component of printing the layering phenomenon appear, appears obvious combination interface between the layer, becomes overall structure's weak department. And the interlayer weak surface becomes more obvious because no external force vibrates in the process of solidifying and hardening the material. The appearance of the interlayer weak surface can cause the structure to generate uncoordinated deformation and discontinuous mechanical properties, and after the member is subjected to the action of external force, the interlayer weak surface can be damaged due to stress concentration, so that the interlayer bonding strength of the 3D printed cement-based material is necessary to be measured, and an effective and reliable interlayer bonding strength testing device for the 3D printed concrete member does not exist at present.
Disclosure of Invention
To the defect or not enough that exist among the prior art, the utility model aims to provide a 3D prints shear strength testing arrangement between concrete layer.
In order to realize the task, the utility model discloses take following technical solution:
a testing device for shear strength between 3D printed concrete layers comprises a frame body consisting of a base, a left pillar, a right pillar and a cross beam, and is characterized in that spring telescopic columns are respectively fixed in the centers of the base and the cross beam, upper slide rails are arranged below the cross beam and on two sides of the spring telescopic columns, and lower slide rails are arranged above the base and on two sides of the spring telescopic columns; a first vertical beam and a second vertical beam are respectively arranged on the left side and the right side of the spring telescopic column, and the first vertical beam and the second vertical beam can horizontally move on the upper sliding rail and the lower sliding rail;
the spring telescopic column is connected with a shear strength testing sleeve film used for fixing a concrete test block to be tested; and a first horizontal loading system and a second horizontal loading system are arranged on one side of the first vertical beam, and a steel base plate is fixed on one side of the second vertical beam.
The utility model discloses an other characteristics are:
the shear strength test mantle is become by connecting steel sheet and solid splint, is provided with first transverse rail and second transverse rail on connecting steel sheet, solid splint can move on first transverse rail and second transverse rail.
The length, width and height of the steel base plate can be adjusted.
The length, width and height of the solid splint can be adjusted.
The shear strength testing device between the 3D printing concrete layers has simple structure, and the moment at any section is balanced when the shear strength is tested; horizontal force which increases progressively step by step is applied through the horizontal loading system until shearing damage is caused between the concrete test block layers to be detected, so that the operation amount is greatly reduced, the practicability is high, and the detection is accurate.
Drawings
Fig. 1 is 3D printed concrete prepared in the examples;
FIG. 2 is a concrete test block cut along the dotted 3D printed concrete line shown in FIG. 1;
FIG. 3 is a schematic structural view of the device for testing the shear strength between 3D printed concrete layers of the present invention;
fig. 4 is a schematic diagram of the device for testing the shear strength between the 3D printed concrete layers of the present invention to be tested;
FIG. 5 is a schematic view of a shear strength test mantle structure;
FIG. 6 is a top view of a shear strength test mantle;
the symbols in fig. 1 to 6 represent: 1. the device comprises a base, 2, a left pillar, 3, a right pillar, 4, a cross beam, 5 and an upper sliding rail; 6. the device comprises a lower sliding rail, 7, a first horizontal loading system, 8, a second horizontal loading system, 9, a spring telescopic column, 10, a shear strength testing sleeve film, 11, a first vertical beam, 12, a second vertical beam, 13, a steel base plate, 14, a concrete test block to be tested, 15, a connecting steel plate, 16, a first transverse rail, 17, a second transverse rail, 18 and a solid clamping plate.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
Referring to fig. 1 to 6, the embodiment provides a device for testing shear strength between 3D printed concrete layers, which includes a frame body composed of a base 1, a left pillar 2, a right pillar 3 and a cross beam 4, wherein spring telescopic columns 9 are respectively fixed in the centers of the cross beam 4 and the base 1, upper slide rails 5 are arranged below the cross beam 4 and on two sides of the spring telescopic columns 9, and lower slide rails 6 are arranged above the base 1 and on two sides of the spring telescopic columns 9; a first vertical beam 11 and a second vertical beam 12 are respectively arranged on the left side and the right side of the spring telescopic column 9, and the first vertical beam 11 and the second vertical beam 12 can horizontally move on the upper slide rail 5 and the lower slide rail 6;
the spring telescopic column 9 is connected with a shear strength testing mantle film 10 used for fixing a concrete test block 14 to be tested; a first horizontal loading system 7 and a second horizontal loading system 8 are arranged on one side of the first vertical beam 11, and a steel backing plate 13 is fixed on one side of the second vertical beam 12.
The concrete test block 14 to be tested is fastened by adopting the shear strength testing sleeve film 10, so that concrete strips on the upper side and the lower side of the concrete test block 14 to be tested form a whole respectively, and horizontal shear force acts on the solid clamping plate 18 of the shear strength testing sleeve film 10 through the first horizontal loading system and the second horizontal loading system (7 and 8) and further acts on the concrete strips on the two sides of the concrete test block 14 to be tested, so that the interlaminar shear strength is determined.
In this embodiment, the shear strength testing mantle 10 is formed by combining a connecting steel plate 15 and a solid splint 18 (fig. 5), wherein two transverse rails (16, 17) are arranged below the connecting steel plate 15 on the shear strength testing mantle 10, and the solid splint 18 can horizontally move on the connecting steel plate 15 through the two transverse rails (16, 17) to meet the length requirements of different 3D printed concrete tests 14;
in this embodiment, the length, width and height of the solid clamping plate 18 are 40mm × 40mm × 5mm, and the length, width and height of the steel backing plate 13 are 80mm × 40mm × 20 mm; and the sizes of the solid clamping plate 18 and the steel backing plate 13 can be adjusted so as to be suitable for testing the concrete test blocks 14 to be tested with different sizes and testing the shear strength between different layers of the concrete test blocks 14 to be tested.
The spring telescopic column 9 can be adjusted up and down according to the thickness of the concrete test blocks 14 to be tested with different sizes, and in the moving process of the spring telescopic column 9, the spring telescopic column 9 only plays a role in limiting the vertical movement of the shear strength test sleeve film 10. Therefore, during the expansion and contraction of the spring telescopic column 9, when the spring telescopic column 9 contacts the shear strength test sleeve 10, the movement of the spring telescopic column 9 should be stopped, so as to prevent the shear strength value from being influenced by the pressure applied by the spring telescopic column 9 to the concrete test block 14 to be tested.
In this embodiment, the loading rates and the sizes of the first horizontal loading system 7 and the second horizontal loading system 8 are the same. The first horizontal loading system (7), the second horizontal loading system (8) and the steel base plate (13) can respectively horizontally move through the first vertical beam (11) and the second vertical beam (12) so as to test the interlayer shear strength of the concrete test blocks (14) to be tested with different sizes and the shear strength of the concrete test blocks (14) to be tested between different layers.
Experiments of the applicant show that the shear strength testing device between the 3D printing concrete layers in the embodiment can test the shear strength between the 3D printing concrete layers, and the method comprises the following specific steps:
(1) printing concrete by adopting an extrusion accumulation type process, wherein a printing nozzle has the diameter of 40mm, the printing height is 20mm, the printing length is 240mm, the number of printing layers is 8, and curing is carried out according to relevant regulations (figure 1);
(2) after the maintenance is finished, cutting the concrete strips to obtain concrete test blocks to be tested (shown in figure 2) with the size of 160 multiplied by 40 mm;
(3) calculating the area S of the contact surface between the layers of the 3D printed concrete test piece;
(4) placing the cut concrete test block 14 to be tested into a 3D printed concrete interlaminar shear strength testing device, clamping the upper and lower ends (layers 1-2 and 7-8) of the concrete test block 14 to be tested by adopting a shear strength testing sleeve film 10 when the 3D printed concrete interlaminar shear strength testing device is placed, and clamping the concrete test block 14 to be tested by moving up and down through an adjusting spring telescopic column 9; then moving the second vertical beam 12 until the steel backing plate 13 on the left side contacts with the 3 rd to 6 th layers of the concrete test block 14 to be tested (figure 4);
(5) by moving the first vertical beam 11, the horizontal loading system (7, 8) stops moving when contacting the shear strength test sleeve film 10, then the horizontal loading system (7, 8) is started, the horizontal loading system (7, 8) can transmit force to the concrete test block 14 to be tested through the solid clamping plate 18 on the left side of the shear strength test sleeve film 10, and horizontal shear destructive force is generated among the layers of the concrete test block 14 to be tested by applying gradually increasing horizontal force. Recording the numerical value of the horizontal shearing destructive power of the previous stage when the concrete test block 14 to be tested is subjected to horizontal shearing destruction as the horizontal shearing destructive power and recording as V;
(6) dividing the horizontal shearing destructive force V by the interlayer contact area S of the concrete test block 14 to be tested to obtain the interlayer shear strength of the concrete test block 14 to be tested, and recording the interlayer shear strength as
In this embodiment, in order to ensure that the test result is as close as possible to the actual test result, the printed concrete may be cured under the same conditions as the field, for example, the temperature and humidity of curing are controlled to be as same as the field as possible.
In this embodiment, the contact surface area between 14 layers of the concrete test block to be measured is measured on site by an experimenter, and the average value of the areas of the interlaminar shear strengths (between 2 nd and 3 rd layers, between 6 th and 7 th layers) to be measured is taken as the contact surface area between layers.
The shear strength testing sleeve film 10 is used for fastening two ends (1 st-2 th layers and 7 th-8 th layers) of a concrete test block 14 to be tested, so that the concrete test block 14 to be tested at the end part and the shear strength testing sleeve film 10 form a whole, 3-6 layers on the left side of the concrete test block 14 to be tested are in contact with the steel base plate 13 by moving the steel base plate 13, and after the upper end and the lower end (1 st-2 th layers and 7 th-8 th layers) of the concrete test block 14 to be tested are acted by external force, the concrete test block 14 to be tested is subjected to pure shear failure instead of shear-torsion failure, so that the shear strength value is influenced.
In the test process, an interface adhesive can be coated on the contact surface of the shear strength test sleeve film 10 and the concrete test block 14 to be tested so as to enhance the integrity of the test sleeve films on the upper side and the lower side and the concrete strip to be tested.
When the horizontal loading system (7, 8) is moved, the centroid of the horizontal loading system (7, 8) is made to act on the centroid position of the solid clamping plate 18 on the left side of the shear strength test sleeve 10.
The shear plane of the concrete test block 14 to be tested is destroyed according to the following: during the interlaminar shear strength test, when the horizontal shear destructive force applied by the horizontal loading systems (7 and 8) is obviously reduced, and the middle part (the 3 rd to 6 th layers) of the concrete test block 14 to be tested is obviously displaced relative to the left and right parts (the 1 st to 2 th layers and the 7 th to 8 th layers), the shear surface of the concrete test block 14 to be tested is considered to be damaged, and the numerical value of the vertical shear destructive force of the previous stage when the concrete test block 14 to be tested is subjected to shear damage is recorded as V.
In this embodiment, the horizontal shear destructive force that can be borne between the printed concrete layers should be estimated in advance, the loading value of each level of the horizontal shear force generated by the horizontal loading system is not more than 20% of the horizontal shear destructive force, and when the horizontal shear force is loaded to 90% of the vertical horizontal shear destructive force, the loading value of each level is not more than 5% of the horizontal shear destructive force, so as to ensure that the more accurate the horizontal shear destructive force V of the shear destruction of the concrete block 14 to be tested is, the shearing strength f isVThe more accurate.
Claims (4)
1. A testing device for shear strength between 3D printed concrete layers comprises a frame body consisting of a base (1), a left pillar (2), a right pillar (3) and a cross beam (4), and is characterized in that spring telescopic columns (9) are respectively fixed in the centers of the base (1) and the cross beam (4), upper slide rails (5) are arranged below the cross beam (4) and positioned on two sides of the spring telescopic columns (9), and lower slide rails (6) are arranged above the base (1) and positioned on two sides of the spring telescopic columns (9); a first vertical beam (11) and a second vertical beam (12) are respectively arranged on the left side and the right side of the spring telescopic column (9), and the first vertical beam (11) and the second vertical beam (12) can horizontally move on the upper sliding rail (5) and the lower sliding rail (6);
the spring telescopic column (9) is connected with a shear strength testing mantle (10) used for fixing a concrete test block (14) to be tested; a first horizontal loading system (7) and a second horizontal loading system (8) are arranged on one side of the first vertical beam (11), and a steel base plate (13) is fixed on one side of the second vertical beam (12).
2. The 3D printed concrete intersoil shear strength testing device according to claim 1, wherein the shear strength testing mantle (10) is composed of a connecting steel plate (15) and a solid clamping plate (18), a first transverse rail (16) and a second transverse rail (17) are provided on the connecting steel plate (15), and the solid clamping plate (18) is movable on the first transverse rail (16) and the second transverse rail (17).
3. The 3D printing concrete interlaminar shear strength testing device as claimed in claim 1, wherein the length, width and height dimensions of the steel backing plate (13) can be adjusted.
4. The 3D printed concrete interlaminar shear strength testing device of claim 2, characterized in that the length, width and height dimensions of the solid clamping plate (18) can be adjusted.
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| CN202120529218.1U CN214584611U (en) | 2021-03-12 | 2021-03-12 | 3D prints shear strength testing arrangement between concrete layer |
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| CN202120529218.1U CN214584611U (en) | 2021-03-12 | 2021-03-12 | 3D prints shear strength testing arrangement between concrete layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562633A (en) * | 2022-01-12 | 2022-05-31 | 广东大鹏液化天然气有限公司 | Online repair method and device for shearing resistance of composite material of pressure pipeline |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562633A (en) * | 2022-01-12 | 2022-05-31 | 广东大鹏液化天然气有限公司 | Online repair method and device for shearing resistance of composite material of pressure pipeline |
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