CN219065060U - Centering bonding installation device for direct tensile fatigue test specimen - Google Patents
Centering bonding installation device for direct tensile fatigue test specimen Download PDFInfo
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- CN219065060U CN219065060U CN202223088241.5U CN202223088241U CN219065060U CN 219065060 U CN219065060 U CN 219065060U CN 202223088241 U CN202223088241 U CN 202223088241U CN 219065060 U CN219065060 U CN 219065060U
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Abstract
The utility model provides a centering bonding installation device for a direct tensile fatigue test specimen, which comprises a base, a middle annular terminal installation structure and an upper centering installation structure, wherein a first circular groove is formed in the middle of the base and the upper centering installation structure, a first circular through hole is formed in the middle of the middle annular terminal installation structure, a plurality of second circular grooves are formed in the edge of the base, the second circular grooves are fixedly connected with a rod piece respectively, and the middle annular terminal installation structure and the upper centering installation structure are provided with corresponding second circular through holes. The middle annular terminal mounting structure is provided with a plurality of pairs of threaded through holes and corresponding threaded rods, and the iron natural color cylindrical nuts can be bonded to the surface fixing positions of the test pieces. The device is matched with each other and is integrated with each other, so that the test piece for the direct tensile fatigue test is firmly bonded and the upper and lower tensile adapter is completely centered, the success rate of the test is greatly improved, and a favorable support is provided for determining the direct tensile fatigue cracking performance of the road material.
Description
Technical Field
The utility model provides a centering bonding installation device suitable for a test piece in a direct tensile fatigue test, which can assist an upper connector and a lower connector to realize centering bonding with the test piece, and an iron natural color cylindrical nut can be firmly bonded to obtain the surface of the test piece so as to ensure the success rate of the tensile fatigue test, and belongs to the field of road engineering.
Background
For road pavement and base materials, under the influence of traffic load, the bottom of the surface layer or the base layer always bears a larger tensile fatigue load effect, and finally fatigue damage occurs. Therefore, in order to ensure reliable service performance of the road material, a related indoor tensile fatigue test is often required. At present, most of the adopted tests are indirect tensile fatigue test methods, but few of the adopted direct tensile fatigue test methods are direct tensile test methods, and the requirements of the direct tensile test on test piece centering, bonding firmness and the like are very high, so that the tests are difficult to complete. However, for the material performance, the direct tensile test is more capable of reacting to the local stress state and fatigue cracking performance of the material in the tensile state than the indirect tensile test, so that a centering bonding installation device for a test piece of the direct tensile fatigue test is needed.
Disclosure of Invention
In order to realize the direct tensile fatigue test of the road material, the utility model provides the mounting device which can help the test piece and the tensile joint to realize centering bonding and the iron natural color cylindrical nut to be firmly bonded to obtain the surface of the test piece, so as to solve the technical problem that the direct tensile fatigue test of the current road material is difficult to realize, thereby better guiding the design and evaluation of the road material.
The technical scheme adopted is as follows:
a centering bonding installation device for direct tensile fatigue test piece, includes base, middle annular terminal mounting structure and upper portion centering mounting structure, it has first circular recess to open in the middle of base and the upper portion centering mounting structure, the diameter of first circular recess respectively with the lower part tensile adapter of direct tensile fatigue test piece, upper portion tensile adapter diameter cooperation is used for fixed lower part tensile adapter, upper portion tensile adapter, open in the middle of the middle annular terminal mounting structure has first circular through-hole, the diameter of first circular through-hole is greater than the diameter of direct tensile fatigue test piece, be equipped with a plurality of second circular recesses on the border of base, second circular recess respectively with a member fixed connection, middle annular terminal mounting structure and upper portion centering mounting structure are equipped with the circular through-hole of second that corresponds, the second circular through-hole passes through the member, realize the alignment of base, middle annular terminal mounting structure and upper portion centering mounting structure, realize the centering of direct tensile fatigue test piece.
Further, a plurality of pairs of symmetrical threaded through holes and corresponding extending threaded rods are arranged on the side face of the middle annular terminal mounting structure, grooves are formed in the end portions of the extending threaded rods and used for placing iron natural color cylindrical nuts, and the iron natural color cylindrical nuts are bonded to the surface fixing positions of the test pieces.
Further, three second circular grooves are formed in the edge of the base and are distributed in a central symmetry mode.
Further, the second circular groove is fixed with the rod piece through screw threads.
Further, the height of the intermediate ring terminal mounting structure is greater than 1/2 of the length of the direct tensile fatigue test specimen.
The utility model provides a centering bonding installation device suitable for a direct tensile fatigue test specimen, which comprises a base, a middle annular terminal installation structure and an upper centering installation structure. The device is used for accurately positioning and bonding the iron natural color cylindrical nut to the corresponding position on the surface of a test piece, and is convenient for connecting and measuring the deformation of the test piece by using an external magnetic strain sensor. The middle annular terminal mounting structure utilizes a simple threaded rod telescopic structure to realize the bonding fixation of the iron natural color cylindrical nut. The upper centering mounting structure is used for enabling the upper stretching adapter and the test piece to be in bonding centering, is similar to the base, and is provided with a first circular groove, so that the position of the upper stretching adapter is fixed. The whole set of centering bonding installation devices aiming at the direct tensile fatigue test pieces are matched with each other and are integrated with each other to form a set of complete test device, so that the direct tensile fatigue test pieces are firmly bonded and the upper and lower tensile adapters are completely centered, the success rate of the test is greatly improved, and a favorable support is provided for determining the direct tensile fatigue cracking performance of the base layer or the subbase layer solidified soil materials and the like.
Drawings
FIG. 1 is a block diagram of a base of a centering adhesive mounting device of the present utility model; a is a top view, and b is a front view;
FIG. 2 is a diagram of the construction of the intermediate ring terminal mounting structure of the centering adhesive mounting arrangement of the present utility model; a is a top view, and b is a front view;
FIG. 3 is a top centering block diagram of the centering adhesive mounting arrangement of the present utility model; a is a top view, and b is a front view;
FIG. 4 is a perspective view of the assembled centering adhesive mounting device of the present utility model; wherein a is a centering bonding installation device diagram, and b is a full view diagram in the bonding centering process after a test piece is placed; the upper centering mounting structure 1 stretches into the threaded rod 2, the middle annular terminal mounting structure 3, the base 4, the upper stretching adapter 5, the AB glue strong adhesive interface 6, the iron natural color cylindrical nut 7, the test piece 8 and the lower stretching adapter 9.
Detailed Description
The centering bonding device suitable for the test piece for the direct tensile fatigue test and the use method thereof provided by the utility model are further described below.
Fig. 4 is a perspective view of an assembled centering adhesive mounting device structure of the present utility model, as shown in fig. 4, the centering adhesive mounting device for a direct tensile fatigue test specimen of the present utility model includes a base 4, a middle ring terminal mounting structure 3 and an upper centering mounting structure 1, wherein a first circular groove is formed between the base 4 and the upper centering mounting structure 1, the diameters of the first circular groove are respectively matched with the diameters of a lower tensile adapter 9 and an upper tensile adapter 5 of the direct tensile fatigue test specimen 8 to fix the lower tensile adapter 9 and the upper tensile adapter 5, a first circular through hole is formed between the middle ring terminal mounting structure 3, the diameter of the first circular through hole is larger than the diameter of the direct tensile fatigue test specimen 8, a plurality of second circular grooves are formed on the edge of the base 4, the second circular grooves are respectively fixedly connected with a rod, and the middle ring terminal mounting structure 3 and the upper centering mounting structure 1 are respectively provided with corresponding second circular through holes, so that the alignment of the base 4, the middle ring terminal mounting structure 3 and the upper centering mounting structure 1 is realized by the rod, and the direct tensile test specimen 8 is realized.
FIGS. 1-3 are block diagrams of an exemplary base, intermediate ring terminal mounting structure and upper centering mounting structure, wherein the lower tensile adapter 9 and upper tensile adapter 5 of the direct tensile fatigue test specimen 8 have a diameter of 70mm, and a first circular groove of 70mm is formed between the base 4 and upper centering mounting structure 1, and is the placement position of the lower tensile adapter 9 and upper tensile adapter 5 in the center; meanwhile, three second circular grooves which are 120 degrees in depth and 25mm in distribution are formed in the edge of the base 4, threads are arranged in the second circular grooves and are respectively screwed and fixed with three rod pieces with the diameter of 20mm and one end provided with threads, corresponding second circular through holes are formed in the middle annular terminal mounting structure 3 and the upper centering mounting structure 1, and the second circular through holes are used for realizing the alignment of the base 4, the middle annular terminal mounting structure 3 and the upper centering mounting structure 1 through the rod pieces; the middle annular terminal mounting structure 3 is of a circular structure, the annular width can ensure that the edge can be provided with a second circular through hole, the inner diameter of the annular width can be larger than the diameter of a test piece 8 for direct tensile fatigue cracking test, in order to be matched with the middle annular terminal mounting structure 3, the base 4 and the upper centering mounting structure 1 are further provided with a third circular groove except for the first circular groove, as shown in the figure, the diameter of the third circular groove is identical to that of the first circular through hole, and the first circular groove and the third circular groove form a stepped hole.
In the direct tensile fatigue test, the strain of the test piece 8 of the direct tensile fatigue test is usually measured at the same time, and an external magnetic strain sensor is generally arranged on the surface of the test piece 8 of the direct tensile fatigue test; in the device, in order to accurately and conveniently bond the iron natural color cylindrical nut 7 to the corresponding position on the surface of solidified soil, and provide conditions for a later external magnetic type strain sensor, a plurality of pairs (generally two pairs) of extending threaded rods 2 are distributed and arranged on the side surface of the middle annular terminal mounting structure 3 at 180 degrees, as shown in fig. 2, the extending threaded rods 2 are 10mm, and grooves with the diameter of 7mm and the depth of 6mm are formed at the end parts of the threaded rods. When the iron natural color cylindrical nut 7 is bonded to the surface of the direct tensile fatigue test specimen 8, only one end of the iron natural color cylindrical nut 7 is required to be placed in a groove extending into the end part of the threaded rod 2, the AB strong adhesive is coated on the other end, and after the direct tensile fatigue test specimen 8 is placed, the iron natural color cylindrical nut 7 is screwed into the threaded rod 2 until the iron natural color cylindrical nut 7 contacts with the surface of the direct tensile fatigue test specimen 8 so as to be bonded.
In general, the height of the middle annular terminal mounting structure 3 is greater than 1/2 of the length of the direct tensile fatigue test specimen 8, so that the external magnetic strain sensor can be mounted at the middle position of the direct tensile fatigue test specimen 8, taking 140mm direct tensile fatigue test specimen 8 as an example, wherein the height of the base 4 is 70mm, the height of the middle annular terminal mounting structure 3 is 100mm, the upper centering mounting structure 1 is 50mm, and the overall height is 220mm. The position of the external magnetic type strain sensor can be guaranteed to be exactly positioned at the middle section (35 mm-105 mm) of the direct tensile fatigue test piece 8 through the pair of bonding installation devices, so that the influence of the friction effect of the end part is avoided, and the better data measured by tensile strain reflects the stress strain condition of the direct tensile fatigue test piece 8 under the direct tensile action; and the centering bonding among the upper part stretching adapter 5, the direct stretching fatigue test piece 8 and the lower part stretching adapter 9 is effectively ensured, so that the effectiveness and the success rate of the stretching fatigue test are ensured. Taking a solidified soil material as an example, the operation scheme of the centering bonding installation device of the direct tensile fatigue test piece of the solidified soil material is as follows:
(1) Preparing a solidified soil test piece: the size of the solidified soil test piece is a cylindrical test piece with the diameter of 70mm and the height of 140mm, and the test piece forming method is consistent with the forming method in the test procedure of the inorganic binder, except that 15g-30g of cement dry powder material is added on the upper surface and the lower surface when the solidified soil test piece is manufactured, then the solidified soil test piece is rolled and formed, and the end part is subjected to water spraying maintenance every 1 day so as to be fully hydrated, so that the solidified soil test piece and the upper and lower tensile adapter can be firmly bonded through AB glue.
(2) The solidified soil test piece is connected with the upper adapter and the lower adapter in a centering way: one surface of the lower adapter 9 is coated with a layer of AB strong adhesive, then the lower adapter is placed in a first circular groove in the middle of the base 3, the position is adjusted, after the complete leveling is ensured, a solidified soil test piece is placed on the lower adapter 9, meanwhile, a rod piece is screwed on a second circular groove in the base, the position is adjusted, the middle annular terminal mounting structure 3 is placed in the position, then the upper surface of the solidified soil test piece is coated with a layer of thinner AB strong adhesive, the upper stretching adapter 5 is used for covering one surface of the solidified soil adhesive, the edges of the solidified soil adhesive are aligned, then the upper centering mounting structure 1 is provided with three vertical rods, and the upper stretching adapter 5 is completely aligned with the first circular groove in the middle.
(3) Iron natural color cylindrical nut bonding: in the step 2, four iron natural color cylindrical nuts 7 are required to be placed in the grooves extending into the front ends of the threaded rods 2 in advance, and a small amount of AB strong adhesive is coated on the other ends of the iron natural color cylindrical nuts 7. After the step 2 is completed, the threaded rod 2 is rotated to bond the iron natural color cylindrical nut 7 with the surface of the solidified soil test piece, and the threaded rod 2 is rotated simultaneously by two 180-degree distributed threaded rods 2 corresponding to the same height when the threaded rod 2 is rotated, so that the penetration depth of the threaded rod 2 is ensured to be approximately the same, and the phenomenon that the solidified soil test piece deviates from the original position due to overlarge force is avoided.
(4) And (3) curing the AB strong adhesive: after the step 2 and the step 3 are completed, the centering installation device is not moved and touched any more, the AB glue strong adhesive interface 6 is formed at the connecting part after waiting for 24 hours, then the centering connection piece is taken out, the threaded rod 2 is rotated and stretched into the threaded rod during taking out, the four iron natural color cylindrical nuts 7 are completely separated from the grooves stretching into the end parts of the threaded rod 2, and then the upper centering installation structure 1 is removed to complete centering adhesion of the test piece for the direct tensile fatigue test.
It should be noted that when the centering bonding installation device is used to make the upper and lower tensile adapter and the test piece centering bond, the dosage of AB strong adhesive should be noted, so that the dosage is not too large, the adhesive is prevented from overflowing and flowing to other positions under the action of pressure, but too small, so that the connection between the test piece and the upper and lower tensile adapter is prevented from being unstable, and a thin layer is preferable. Meanwhile, in order to ensure that the iron natural color cylindrical nut 7 and the surface of the solidified soil test piece can be firmly bonded, the surface of the solidified soil test piece should be ensured to be free of greasy dirt, dust and the like.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary or exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (5)
1. A centering bonding installation device for direct tensile fatigue test piece, a serial communication port, including base, middle annular terminal mounting structure and upper portion centering mounting structure, it has first circular recess to open in the middle of base and the upper portion centering mounting structure, the diameter of first circular recess respectively with the lower part tensile adapter of direct tensile fatigue test piece, upper portion tensile adapter diameter cooperation is used for fixed lower part tensile adapter, upper portion tensile adapter, open in the middle of the middle annular terminal mounting structure has first circular through-hole, the diameter of first circular through-hole is greater than the diameter of direct tensile fatigue test piece, be equipped with a plurality of second circular recesses on the border of base, second circular recess respectively with a member fixed connection, middle annular terminal mounting structure and upper portion centering mounting structure are equipped with corresponding second circular through-hole, the second circular through-hole passes through the member, realize the alignment of base, middle annular terminal mounting structure and upper portion centering mounting structure, realize the centering of direct tensile fatigue test piece.
2. The device according to claim 1, wherein the side surface of the middle annular terminal mounting structure is provided with a plurality of symmetrical pairs of threaded through holes and corresponding extending threaded rods, and the end parts of the extending threaded rods are provided with grooves for placing iron natural color cylindrical nuts.
3. The device according to claim 1, wherein three second circular grooves are formed in the edge of the base, and the three second circular grooves are distributed in a central symmetry manner.
4. The device of claim 1, wherein the second circular groove is threadably secured to the rod.
5. The apparatus of claim 1, wherein the intermediate ring terminal mounting structure has a height greater than 1/2 of a length of a direct tensile fatigue test specimen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223088241.5U CN219065060U (en) | 2022-11-17 | 2022-11-17 | Centering bonding installation device for direct tensile fatigue test specimen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223088241.5U CN219065060U (en) | 2022-11-17 | 2022-11-17 | Centering bonding installation device for direct tensile fatigue test specimen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219065060U true CN219065060U (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223088241.5U Active CN219065060U (en) | 2022-11-17 | 2022-11-17 | Centering bonding installation device for direct tensile fatigue test specimen |
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| Country | Link |
|---|---|
| CN (1) | CN219065060U (en) |
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- 2022-11-17 CN CN202223088241.5U patent/CN219065060U/en active Active
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