Long-term bending resistance loading test device for concrete beam
By using a combination of jacks, pressure sensors, and fasteners in the concrete beam loading device, the problems of unstable load holding and insufficient accuracy during long-term loading of concrete beams were solved, thus achieving stability and accuracy in the bending test of concrete beams.
Patent Information
- Application Number
- CN202422650104.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In existing technologies, mechanical loading methods are difficult to guarantee the long-term load stability and loading accuracy of concrete beams, especially the jack method and bolt method, which have instability and accuracy problems during long-term loading.
The load is transferred to the pressure sensor and the load distribution beam by jacks, and the concrete beam is kept under stress by fasteners. The pressure sensor detects load changes, and the jacks, screws and fasteners work together to achieve stable application of long-term bending load.
It improves the accuracy and load-bearing stability of concrete beam bending tests, ensures the long-term uniformity of compression on the top surface of the concrete beam and the accuracy of loading, and the device has a simple structure and high strength.
Smart Images
Figure CN223449706U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to concrete beam test equipment technical field, concretely relates to a concrete beam long -term bending loading test device. BACKGROUND
[0002] Concrete beam is the common bending member in civil building structure, and the service life of general building structure is longer, is usually more than 30 years, and in this process, concrete beam can occur creep. The phenomenon that concrete deformation develops with time under the long -term load is called concrete creep. When the action load is unchangeable, the creep can lead to the deformation and crack of concrete beam, and the long -term mechanical property of concrete beam directly influences the durability of building structure long -term use, therefore, concrete beam needs to be subjected to long -term bending test before being put into use.
[0003] At present, the bending loading method of concrete beam mainly is heavy loading and mechanical loading, and the heavy loading method needs a large number of heavy objects and manpower when aiming at larger bearing capacity beam, and if a plurality of beam test pieces are loaded at a time, heavy objects need to occupy a larger space, and the space requirement of laboratory is larger. The mechanical loading usually adopts jack method or bolt method, and the loading precision of jack method to concrete beam is best controlled, but it is difficult to guarantee the load holding stability for months for oil pressure jack, mechanical jack or hand-operated jack. The load holding stability of bolt method is not as good as heavy loading, the loading precision is not as good as jack method, and it is difficult to apply too large load by tightening the bolt. SUMMARY
[0004] In order to solve the problems that the jack method in the existing mechanical loading is difficult to guarantee the load holding stability for months to concrete beam and the loading precision stability of bolt method is low, the utility model provides a concrete beam long -term bending loading test device, load is sequentially transmitted to the second crossbeam, pressure sensor, loading distribution beam by jack and then transmitted to concrete beam, the pressure sensor detects when the load reaches the requirement, and the concrete beam is kept stressed by fastener, at this time, the jack stops working, when the pressure sensor detects that the load changes more than a certain amplitude, the jack works again, the jack of the device cooperates with the fastener and can effectively apply the long -term bending load of the compression of the top surface of concrete beam, and the load holding is more stable.
[0005] In order to realize the above -mentioned purpose, the technical scheme of the utility model is:
[0006] The utility model provides a long -term bending loading test device of concrete beam, including the base, both ends of the upper side of base are fixed with support, the upper end of support is fixed with first hinge support, and the upper end of first hinge support is equipped with concrete beam, and the upper end of concrete beam is equipped with two second hinge supports, and the upper end of two second hinge supports is equipped with loading distribution beam, still includes loading mechanism, and loading mechanism includes first crossbeam, second crossbeam, screw rod, fastener and jack, the screw rod passes first crossbeam, second crossbeam and base in proper order from top to bottom, and jack is located between first crossbeam and second crossbeam, and second crossbeam is located above loading distribution beam, and be equipped with pressure sensor between second crossbeam and loading distribution beam, and screw rod is connected with fastener in screw thread, and the base is fixedly connected with screw rod through fastener, and first crossbeam is fixedly connected with screw rod through fastener, and the upper end of second crossbeam is in contact with fastener.
[0007] Further, the two second hinge supports are respectively arranged at three equal parts of the concrete beam, so that the concrete beam top surface is uniformly compressed, and the bending test effect is better.
[0008] Further, the fastener is a nut.
[0009] Further, the screw rod is an M33 screw rod.
[0010] Further, the support and the base are fixedly connected through bolts.
[0011] Further, the upper and lower ends of the pressure sensor are both provided with steel plates.
[0012] Through the above technical solution, the utility model has the beneficial effects that:
[0013] 1. When the jack works, the load generated is sequentially transmitted to the second crossbeam, the pressure sensor, the loading distribution beam, and then to the concrete beam. When the pressure sensor detects that the load reaches the requirement, the fastener is used to keep the concrete beam under stress, and then the fastener on the screw rod is twisted to make it in contact with the upper end of the second crossbeam, so that the concrete beam top surface is subjected to long-term bending load. After a period of time, when the pressure sensor detects that the load changes by more than a certain amplitude, the jack works again to keep the load on the concrete beam. Compared with the single jack method or the bolt method, the bending load on the concrete beam top surface is always stable, and the accuracy of the concrete beam bending test is improved.
[0014] 2. The base, support, first beam and second beam in the present invention are all steel structure components, which are high in strength and not easy to be damaged. At the same time, the structure and operation of the device are relatively simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Fig. 1 This is a front view of a long-term bending load test device for concrete beams according to the present invention;
[0016] Fig. 2 This is a side view of a long-term bending load test device for concrete beams according to the present invention;
[0017] Fig. 3 This is a structural schematic diagram of the base of a long-term bending load test device for concrete beams of the present invention;
[0018] Fig. 4 This is a structural schematic diagram of a support for a long-term bending load test device for concrete beams of the present invention.
[0019] The numbers in the accompanying drawings are: 1 for the base, 2 for the support, 3 for the first hinge support, 4 for the concrete beam, 5 for the second hinge support, 6 for the load distribution beam, 7 for the first crossbeam, 8 for the second crossbeam, 9 for the screw, 10 for the fastener, 11 for the jack, 12 for the pressure sensor, and 13 for the steel plate. DETAILED DESCRIPTION
[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0021] like Figs. 1-4 As shown, this embodiment provides a long-term bending load test device for concrete beams, including a base 1, with supports 2 fixed at both ends of the upper side of the base 1, the supports 2 and the base 1 are fixedly connected by bolts, a first hinge support 3 is fixed to the upper end of the support 2, a concrete beam 4 is provided at the upper end of the first hinge support 3, two second hinge supports 5 are provided at the upper end of the concrete beam 4, and a load distribution beam 6 is provided at the upper ends of the two second hinge supports 5; in this embodiment, the two second hinge supports 5 are respectively arranged at the three equal division points of the concrete beam 4.
[0022] It also includes a loading mechanism, which includes a first crossbeam 7, a second crossbeam 8, a screw 9, a fastener 10 and a jack 11. The screw 9 passes through the first crossbeam 7, the second crossbeam 8 and the base 1 from top to bottom. The jack 11 is located between the first crossbeam 7 and the second crossbeam 8. The second crossbeam 8 is located above the loading distribution beam 6. A pressure sensor 12 is provided between the second crossbeam 8 and the loading distribution beam 6. The screw 9 is threadedly connected to the fastener 10. The screw 9 is a high-strength screw of M33.
[0023] The base 1 is fixedly connected to the screw rod 9 by a fastener 10. The first crossbeam 7 is fixedly connected to the screw rod 9 by a fastener 10. The upper end of the second crossbeam 8 contacts the fastener 10. The fastener 10 is a nut. Steel plates 13 are provided at the upper and lower ends of the pressure sensor 12.
[0024] In this embodiment, the base 1, support 2, first crossbeam 7, and second crossbeam 8 are all steel components, offering high strength and resistance to damage. The pressure sensor 12 can be an HZC-HT model. The jack 11 can be a commercially available 32-ton jack from Shanghai Gong. In this embodiment, the first hinge support 3 and the second hinge support 5 are conventional in the art and will not be described in detail.
[0025] When using this device to conduct a bending load test on the concrete beam 4, the jack 11 located between the first beam 7 and the second beam 8 starts working, and the load it generates is transmitted from top to bottom to the second beam 8, the steel plate 13, the pressure sensor 12, the load distribution beam 6, the second hinge support 5, and then to the concrete beam 4. At this time, the load application is completed, and the four nuts on the second beam 8 are tightened so that they contact the upper surface of the second beam 8. At this time, the jack 11 can be removed, and the concrete beam 4 can be kept loaded by the nuts. After a period of time, when the pressure sensor 12 detects that the load change exceeds 2%, the jack 11 is used again to apply force, and the above steps can be repeated. The jack 11 cooperates with the nuts to keep the top surface of the concrete beam 4 under a long-term bending load, and the load holding is more stable and the effect is more obvious.
[0026] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.
Claims
1. A long-term bending load test device for a concrete beam, comprising a base (1), supports (2) fixed at both ends of the upper side of the base (1), a first hinge support (3) fixed at the upper end of the support (2), a concrete beam (4) provided at the upper end of the first hinge support (3), two second hinge supports (5) provided at the upper end of the concrete beam (4), and a load distribution beam (6) provided at the upper ends of the two second hinge supports (5); It is characterized by: The loading mechanism also includes a first crossbeam (7), a second crossbeam (8), a screw (9), a fastener (10) and a jack (11), wherein the screw (9) passes through the first crossbeam (7), the second crossbeam (8) and the base (1) in sequence from top to bottom, the jack (11) is located between the first crossbeam (7) and the second crossbeam (8), the second crossbeam (8) is located above the loading distribution beam (6), a pressure sensor (12) is provided between the second crossbeam (8) and the loading distribution beam (6), and the screw (9) and the fastener (10) are threadedly connected; The base (1) and the screw rod (9) are fixedly connected via a fastener (10), the first crossbeam (7) and the screw rod (9) are fixedly connected via a fastener (10), and the upper end of the second crossbeam (8) is in contact with the fastener (10).
2. A long-term bending load test device for concrete beams according to claim 1, characterized in that: The two second hinge supports (5) are respectively arranged at the three-division points of the concrete beam (4).
3. A long-term bending load test device for concrete beams according to claim 1, characterized in that: The fastener (10) is a nut.
4. A long-term bending load test device for concrete beams according to claim 1, characterized in that: The screw (9) is an M33 screw.
5. The long-term bending load test device for concrete beams according to claim 1, characterized in that: The support (2) and the base (1) are fixedly connected by bolts.
6. A long-term bending load test device for concrete beams according to claim 1, characterized in that: Steel plates (13) are provided at both the upper and lower ends of the pressure sensor (12).