Shear block load test device

Abstract

The utility model discloses a shear block load test device, which is provided with two groups of precast blocks, a group of shear blocks is fixedly arranged on each group of precast blocks, a jack is arranged between the two groups of shear blocks, and a limiting rectangular frame 4 is arranged around the two groups of precast blocks. And the shear block is fixed on the precast block through a threaded rod. And installing a 250t center hole jack to start the test after the test is qualified. During the test, the strength of the test block concrete cured under the same condition on site is 40Mpa, and the strength of the precast block for the test is 40Mpa. Two prefabricated blocks of 100 cm * 120 cm * 150 cm are prefabricated on a concrete compression member on site, the mark number is C40, maintenance test pieces under the same condition are reserved on site, and the distance between the prefabricated blocks is 30 cm. I36 longitudinal I-shaped steel and I45 transverse I-shaped steel are processed into two rectangular limiting frames to fix the concrete precast blocks.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bridge shear block load test, specifically is a kind of shear block load test device. BACKGROUND

[0002] Bridge shear block load test mainly has the following important effects:

[0003] I. Verify design rationality:

[0004] Test structural performance: by exerting specific load on shear block, the various forces that shear block and load-bearing parts may bear in actual use can be simulated, so as to test whether the structural performance of shear block and load-bearing parts concrete meets the design requirements. For example, determine the deformation and stress distribution of shear block under different load levels, verify whether the calculation of shear block strength and stiffness in design is accurate, determine the deformation and crushing of steel reinforced concrete structure of embedded part stress position. If the test results are consistent with the design expectations, it shows that the design is reasonable and reliable, which can provide protection for the safe use of bridge;If there is difference, the deficiencies in design can be found in time, which provides basis for further optimization design.

[0005] Optimize design parameters: load test can obtain actual structural response data, which can be used for inverse analysis of design parameters, so as to optimize design. For example, according to the actual bearing capacity of shear block measured by test, the safety factor in design can be adjusted to make the design more economical and reasonable. At the same time, through test, the interaction between shear block and bridge main load-bearing parts can be understood, which provides reference for the optimization design of overall structure.

[0006] II. Evaluate construction quality and safety:

[0007] Detect construction defects: shear block may have some quality problems in construction process, such as concrete pouring not dense, unreasonable steel arrangement, etc. Load test can reveal these potential construction defects, find out problems in time and take corresponding remedial measures. For example, if the deformation of shear block is abnormal in test, it may be caused by insufficient concrete strength or internal cavity, etc., so the shear block needs to be further detected and repaired.

[0008] Ensure construction safety: load test is an objective test of temporary structure safety performance, which can ensure that shear block meets the design and specification requirements in construction process. Only the shear block that passes load test can ensure its normal function in bridge construction process. If the test results do not meet the requirements, construction unit needs to redesign shear block and embedded part until the requirements are met, so as to improve the overall safety of construction.

[0009] III. Provide the basis for bridge maintenance:

[0010] Determine the maintenance focus: Through the load test, the working state of the shear block under different load conditions can be known, and the vulnerable parts and weak links are determined. At the same time, it can be directly judged whether the embedded part causes damage to the main structure of the bridge. These information can provide the key attention area for the daily maintenance of the bridge construction and formulate the targeted maintenance plan. For example, if the test finds that the stress concentration of a part of the shear block is more obvious, the monitoring and inspection of the part need to be strengthened in the daily maintenance, and potential problems are found in time.

[0011] In summary, the bridge shear block load test plays an important role in verifying the rationality of the design, evaluating the construction quality and safety, and providing the basis for bridge maintenance.

[0012] The existing similar components are generally not tested, and only finite element analysis calculation is adopted. However, the reliability of the new shear member structure is not stable by calculation (mainly afraid of concrete crushing). Content of the utility model

[0013] Therefore, in order to solve the above problems, the utility model provides a shear block load test device.

[0014] The utility model is implemented in the following way, a shear block load test device is constructed, characterized in that: two groups of precast blocks (1) are provided, a group of shear blocks (2) is fixedly installed on each group of precast blocks (1), a jack (3) is installed between the two groups of shear blocks (2), and a limiting rectangular frame (4) is arranged around the two groups of precast blocks (1).

[0015] According to the shear block load test device, the shear block (2) is fixed on the precast block (1) through a threaded rod.

[0016] According to the shear block load test device, after acceptance, a 250t through-type jack is installed to start the test. During the test, the on-site test block concrete strength is 40Mpa, and the precast block strength for testing is 40Mpa.

[0017] According to the shear block load test device, two 100cm*120cm*150cm precast blocks are precast on site, and the label is C40. The same condition maintenance test piece is left on site, and the precast block spacing is 30cm.

[0018] According to the shear block load test device, I36 longitudinal I-shaped steel and I45 transverse I-shaped steel are used to process two rectangular limiting frames to fix the concrete precast blocks.

[0019] The advantages of this utility model are as follows: This utility model discloses a shear block load testing device, which has two sets of precast blocks, with a set of shear blocks fixedly installed on each set of precast blocks. A jack is installed between the two sets of shear blocks, and a limiting rectangular frame is set around the two sets of precast blocks. The shear blocks are fixed to the precast blocks by threaded rods. After acceptance, a 250t through-hole jack is installed to start the test. During the test, the concrete strength of the on-site cured test block is 40 MPa, and the strength of the precast block used for the test is 40 MPa. Two 100cm×120cm×150cm precast blocks, labeled C40, are precast on-site for the concrete compression member. Test specimens cured under the same conditions are left on-site, with a spacing of 30cm between the precast blocks. Two rectangular limiting frames are made of I36 (longitudinal) and I45 (transverse) I-beams to fix the concrete precast blocks. Attached Figure Description

[0020] Figure 1 This is the overall layout diagram of the support structure;

[0021] Figure 2 This is a diagram of the shear block construction.

[0022] Figure 3 This is the load test plan layout;

[0023] Figure 4 This is the layout diagram for the load test;

[0024] Figure 5 This is the reinforcement diagram of the experimental short column in this application.

[0025] Among them: 1. Precast block; 2. Shear block; 3. Jack; 4. Limiting rectangular frame; 5. Stiffening rib. Detailed Implementation

[0026] The following will be combined with the appendix Figures 1-3 This utility model will be described in detail, and the technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0027] This utility model provides a shear block load testing device, as shown in the figure, which can be implemented in the following manner: it has two sets of precast blocks 1, each set of precast blocks 1 is fixedly installed with a set of shear blocks 2, a jack 3 is installed between the two sets of shear blocks 2, and a limiting rectangular frame 4 is set around the two sets of precast blocks 1.

[0028] In the shear block load testing device described in this application, the shear block 2 is fixed to the precast block 1 by a threaded rod.

[0029] In the shear block load test device described in the application; install a 250t through core jack to start the test after passing the acceptance test. During the test, the on-site maintenance test block concrete strength is 40Mpa, and the test block strength is 40Mpa.

[0030] In the shear block load test device described in the application; two 100cm×120cm×150cm precast blocks are precast on site, with a label of C40, and the same condition maintenance test piece is left on site, with a spacing of 30cm.

[0031] In the shear block load test device described in the application; two rectangular limit frames are made of I36 (longitudinal) I45 (transverse) I-shaped steel to fix the concrete precast block.

[0032] As shown in Figure 1 , 0# block support adopts pre-buried hole in main pier, installs shear block and pull-out precision threaded steel with triangular bracket to form force support support.

[0033] As shown in Figure 2 , the shear block is made of Q235 thick 30mm steel plate according to the above figure, the anchor rod is φ25 precision threaded steel, and the concrete precast hole is 7cm×34cm×44cm.

[0034] This test is selected in the steel structure processing yard of Taojiang Bridge, the two main plates of the shear block are processed by the manufacturer, the arc segment is strictly processed according to the design size, and the other stiffening plates are cut and welded on site; two 100cm×120cm×150cm precast blocks are precast on site, with a label of C40, and the same condition maintenance test piece is left on site, with a spacing of 30cm, I36 longitudinal I-shaped steel and I45 transverse I-shaped steel are used to process two rectangular limit frames to fix the concrete precast block.

[0035] After the installation of the test device is completed, check whether the installation position of the shear block, the connection of the pull rod, the welding of the limit rectangular frame, and whether it is horizontal meet the design requirements, and install a 250t through core jack to start the test after passing the acceptance test. During the test, the on-site maintenance test block concrete strength is 40Mpa, and the test block strength is 40Mpa.

[0036] The load is divided into four levels, and the holding time of the first, second and third levels is 2min, and the holding time of the fourth level is 30min. The first load is 55t, the second load is 80t, the third load is 100t, and the fourth load is 120t. When each load is loaded, observe and record the data of pressure, jack stroke, etc.

[0037] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shear block load testing apparatus characterized by ； The two groups of prefabricated blocks (1) are fixedly installed with a group of shear blocks (2), and the two groups of shear blocks (2) are installed with a jack (3).

2. The shear block load testing apparatus of claim 1, wherein: The shear block (2) is fixed on the prefabricated block (1) through a threaded rod.

3. The shear block load testing apparatus of claim 1, wherein: After the acceptance, a 250t through-type jack is installed to start the test.

4. The shear block load testing apparatus of claim 1, wherein; The concrete compression member is prefabricated with two 100cm*120cm*150cm prefabricated blocks on site, with a C40 label, and the test pieces are left in the same condition for maintenance, with a 30cm spacing between the prefabricated blocks.

5. The shear block load testing apparatus of claim 1, wherein; The I36 longitudinal I steel and the I45 transverse I steel are processed into two rectangular limiting frames to fix the concrete prefabricated blocks.

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