Static load test system based on counterforce of prestressed expanded-head anchor rod of finish-rolled twisted steel

Abstract

The utility model discloses a static load test system based on counterforce of a finish-rolled twisted steel prestressed expanded head anchor rod. The static load test system at least comprises but is not limited to a loading assembly, a counterforce assembly, a main beam and a secondary beam, the loading assembly is arranged below the main beam, the secondary beams are arranged above the main beam in a staggered mode, and the counter-force assembly is connected with the secondary beams and fixes the secondary beams and the ground together. According to the system, compared with a stacking and weighting mode in the prior art, the occupied space needed by an experiment can be greatly reduced, meanwhile, heavy objects do not need to be carried, waste of manpower resources can be greatly reduced, meanwhile, the counter-force assemblies for fixing the secondary beams are arranged in the ground, and the overall safety performance can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of static load testing, in particular to a static load testing system based on the reaction force of a prestressed enlarged head anchor rod of a precision-rolled threaded steel bar. Background Art

[0002] Static load tests are widely used in the engineering field. With the development of engineering technology, the reaction force required for static load tests is getting higher and higher, and the problems caused by the traditional loading method are becoming more and more prominent. As the amount of pile increases, the cost and safety problems are becoming more and more serious. Therefore, a method is needed to solve the cost and safety problems caused by the traditional loading method. Utility Model Content

[0003] The purpose of the utility model is to provide a static load test system based on the reaction force of the anchor rod of the prestressed enlarged head of the precision-rolled threaded steel bar to address the above-mentioned shortcomings, thereby solving the problems of the conventional static load test method, which uses the increased pile volume, high cost and high risk factor.

[0004] The utility model is realized by the following scheme:

[0005] A static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision-rolled threaded steel bar includes at least but not limited to a loading component, a reaction component, a main beam and a secondary beam; the loading component is arranged below the main beam, the secondary beam is staggered above the main beam, the reaction component is connected to the secondary beam, and the secondary beam is fixed to the ground.

[0006] Based on the structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod of the fine-rolled threaded steel bar, a bearing plate is arranged at the bottom of the loading assembly, and the area of ​​the bearing plate is not less than the projection area of ​​the loading assembly on the horizontal plane; the bearing plate is placed on the ground, and the bearing plate is in contact with the bottom surface of the loading assembly.

[0007] Based on the structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod of the precision-rolled threaded steel bar, a dial indicator is also arranged on the bearing plate; and a plurality of dial indicators are arranged at circumferential positions along the loading component.

[0008] Based on the structure of the static load test system for the reaction force of the anchor rod of the prestressed enlarged head of the fine-rolled threaded steel bar, the loading assembly includes a jack, an oil pump and a hydraulic gauge; the oil pump and the hydraulic gauge are connected to the jack, the bottom of the jack is arranged at the center position of the bearing plate, and the top of the jack is arranged at the center position of the main beam.

[0009] The structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod based on the fine-rolled threaded steel bar, the reaction force component includes a prestressed enlarged head anchor rod, a PSB fine-rolled threaded steel bar, a loading anchor head and a loading plate; part of the end of the PSB fine-rolled threaded steel bar is nested in the stress enlarged head anchor rod, the stress enlarged head anchor rod is pre-buried under the ground where the test is conducted, and the loading plate and the loading anchor head are respectively arranged at the ends of the PSB fine-rolled threaded steel bar.

[0010] Based on the structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod of the fine-rolled threaded steel bar, the secondary beam is provided with a through hole for the PSB fine-rolled threaded steel bar to pass through, and the loading plate and the loading anchor head are respectively provided with threaded through holes matching the PSB fine-rolled threaded steel bar, the loading plate is in contact with the secondary beam, and the loading anchor head is arranged on the end of the loading plate away from the secondary beam.

[0011] The structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod based on the fine-rolled threaded steel bar, the prestressed enlarged head anchor rod includes a main rod and an auxiliary rod, the auxiliary rod is arranged at the center position of the main rod, and the main rod and the auxiliary rod are both cylindrical structures; the size of the main rod is not smaller than the size of the auxiliary rod, so that the main rod and the auxiliary rod form a step structure on the contact surface.

[0012] Based on the structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod of the fine-rolled threaded steel bar, the PSB fine-rolled threaded steel bar is arranged through the auxiliary rod and extends to the lower end of the main rod, so that the PSB fine-rolled threaded steel bar and the prestressed enlarged head anchor rod form a stable integrated structure.

[0013] Based on the structure of the static load test system for the reaction force of the prestressed enlarged head anchor rod of the precision-rolled threaded steel bar, the reaction force components are provided in two numbers, which are symmetrically arranged at the ends on both sides of the secondary beam.

[0014] The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar includes at least but not limited to a loading component, a reaction force component, a main beam and a secondary beam; the loading component is arranged below the main beam, and a plurality of secondary beams are arranged above the main beam, and the reaction force component is connected to the secondary beam, and the secondary beam is fixed to the ground. In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0015] 1. Through this scheme, when a static load test is required, the main beam and secondary beam to be tested are placed in combination, the main beam is placed on the loading assembly, the secondary beam is fixed by the reaction force assembly, the main beam is gradually pressurized by the loading assembly, the fixed secondary beam provides directional support for the main beam, the loading assembly is performed until the reaction force is applied to meet the design requirements, and the static load test is completed; compared with the prior art method of stacking and weighting, this system can greatly reduce the space required for the experiment, and at the same time, there is no need to carry heavy objects, which can also greatly reduce the waste of human resources. At the same time, the reaction force assembly for fixing the secondary beam is set in the ground, which can improve the overall safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side view structural schematic diagram of Example 1;

[0017] Figure 2 It is a schematic diagram of the top view of the structure of Example 1;

[0018] Figure 3 This is a schematic diagram of the arrangement when there are two secondary beams;

[0019] Figure 4 This is a schematic diagram of the arrangement when there are three secondary beams;

[0020] Figure 5 This is a schematic diagram of the arrangement when there are 4 secondary beams;

[0021] Description of the drawings: 1. PSB precision-rolled threaded steel bars; 2. Prestressed enlarged head anchor rod; 3. Loading anchor head; 4. Loading plate; 5. Secondary beam; 6. Main beam; 7. Jack; 8. Loading plate; 9. Dial indicator; 10. Oil pump and hydraulic gauge; 11. Main rod; 12. Auxiliary rod. DETAILED DESCRIPTION

[0022] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0023] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other equivalent or alternative features having similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0024] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0026] Example 1

[0027] like Figure 1-2 As shown, the utility model provides a technical solution:

[0028] A static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision-rolled threaded steel bar includes at least but is not limited to a loading component, a reaction force component, a main beam 6 and a secondary beam 5; the loading component is arranged below the main beam 6, the secondary beam 5 is staggered above the main beam 6, the reaction force component is connected to the secondary beam 5, and the secondary beam 5 is fixed to the ground.

[0029] Based on the above structure, when a static load test is required, the main beam 6 and the secondary beam 5 to be tested are placed in combination, the main beam 6 is placed on the loading assembly, the secondary beam 5 is fixed by the reaction force assembly, and the main beam 6 is gradually pressurized by the loading assembly. The fixed secondary beam 5 provides directional support force for the main beam 6, and the loading assembly is used until the reaction force applied reaches the design requirements to complete the static load test. Compared with the stacking and weighting method of the prior art, the present system can greatly reduce the space required for the experiment, and at the same time, there is no need to carry heavy objects, and the waste of human resources can also be greatly reduced. At the same time, the reaction force assembly for fixing the secondary beam 5 is set in the ground, which can improve the overall safety performance.

[0030] As an example, a bearing plate 8 may be provided at the bottom of the loading assembly, and the area of ​​the bearing plate 8 is not less than the projection area of ​​the loading assembly on the horizontal plane; the bearing plate 8 is placed on the ground, and the bearing plate 8 contacts the bottom surface of the loading assembly.

[0031] Based on the above structure, the bearing plate 8 is placed on the ground. The bearing plate 8 can increase the contact area between the loading assembly and the ground, thereby providing a more stable supporting force for the main beam 6.

[0032] As an example, a dial indicator 9 may be further provided on the bearing plate 8; a plurality of dial indicators 9 may be provided at circumferential positions along the loading assembly.

[0033] Based on the above structure, the dial indicator 9 is often used for shape and position errors and small displacement length measurements. The dial indicator 9 can be used to measure small deformations of the load-bearing plate 8 and record relevant data to determine the end time of the test.

[0034] As an example, the loading assembly may include a jack 7, an oil pump and a hydraulic gauge 10; the oil pump and the hydraulic gauge 10 are connected to the jack 7, the bottom of the jack 7 is arranged at the center position of the bearing plate 8, and the top of the jack 7 is arranged at the center position of the main beam 6.

[0035] Based on the above structure, arranging the jacks 7 at the center positions of the bearing plate 8 and the main beam 6 respectively can ensure that the overall force and the force applied outward are more balanced, and can effectively avoid damage to the bearing plate 8 and the main beam 6.

[0036] As an example, the reaction force component may include a prestressed enlarged head anchor rod 2, a PSB finely rolled threaded steel bar 1, a loading anchor head 3 and a loading plate 4; a portion of the end of the PSB finely rolled threaded steel bar 1 is nested in the stress enlarged head anchor rod, the stress enlarged head anchor rod is pre-buried under the ground where the test is taking place, and the loading plate 4 and the loading anchor head 3 are respectively arranged at the ends of the PSB finely rolled threaded steel bar 1.

[0037] The secondary beam 5 is provided with a through hole for the PSB fine-rolled threaded steel bar 1 to pass through, and the loading plate 4 and the loading anchor head 3 are respectively provided with threaded through holes that cooperate with the PSB fine-rolled threaded steel bar 1. The loading plate 4 is in contact with the secondary beam 5, and the loading anchor head 3 is arranged on the loading plate 4 at the end away from the secondary beam 5.

[0038] Based on the above structure, the PSB fine-rolled threaded steel bar 1 is contacted through the loading plate 4 and the loading anchor head 3, and the extreme position of the secondary beam 5 is limited, providing a reverse force for the main beam 6 under the support of the jack 7; the loading plate 4 can provide a larger contact area for the secondary beam 5 and the loading anchor head 3, increase the limiting force, and prevent the loading anchor head 3 and the loading plate 4 from deformation.

[0039] As an example, the prestressed enlarged head anchor rod 2 may include a main rod 11 and an auxiliary rod 12, wherein the auxiliary rod 12 is arranged at the center of the main rod 11, and both the main rod 11 and the auxiliary rod 12 are cylindrical structures;

[0040] The size of the main rod 11 is not smaller than that of the auxiliary rod 12, so that the main rod 11 and the auxiliary rod 12 form a step structure on the contact surface.

[0041] Based on the above structure, the main rod 11 and the auxiliary rod 12 are both buried in the ground. Since the main rod 11 has a larger area, it can provide greater directional support for the PSB fine-rolled threaded steel bars 1 to prevent the main rod 11 from being pulled off. The auxiliary rod 12 can protect the PSB fine-rolled threaded steel bars 1 to prevent the PSB fine-rolled threaded steel bars 1 from being rusted underground.

[0042] As an example, the PSB fine-rolled threaded steel bar 1 is arranged through the auxiliary rod 12 and extends to the lower end of the main rod 11, so that the PSB fine-rolled threaded steel bar 1 and the prestressed enlarged head anchor rod 2 form a stable integrated structure.

[0043] In this embodiment, two reaction force assemblies are provided, and the main beam 6 adopts a shorter main beam 6 , which are symmetrically arranged at the ends of both sides of the secondary beam 5 .

[0044] Example 2

[0045] like Figure 3 to Figure 5 As shown, this embodiment is similar to embodiment 1, except that in this embodiment, the length of the main beam 6 is different. The utility model provides a technical solution:

[0046] A static load test system based on the reaction force of the prestressed enlarged head anchor rod 2 of the fine-rolled threaded steel bar includes at least but is not limited to a loading component, a reaction force component, a main beam 6 and a secondary beam 5; the loading component is arranged below the main beam 6, and multiple secondary beams 5 are arranged above the main beam 6; the reaction force component is connected to the secondary beam 5, and the secondary beam 5 is fixed to the ground.

[0047] As an example, two secondary beams 5 are provided, and two measuring beams are provided in parallel at the lower end surface of the main beam 6;

[0048] Of course, in order to test a longer main beam 6 , the number of secondary beams 5 can be three as required, and the three secondary beams 5 are respectively arranged in parallel and at both ends and the center of the main beam 6 .

[0049] Alternatively, in order to perform a stronger static load test on the main beam 6 while avoiding occupying too much space, multiple secondary beams 5 can be staggered to form a tic-tac-toe structure, with the main beam 6 being arranged under the two lowest parallel secondary beams 5 .

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A static load test system based on the reaction force of the prestressed enlarged head anchor rod of precision rolled threaded steel bar, characterized in that: At least include but are not limited to a loading component, a reaction component, a main beam and a secondary beam; the loading component is arranged below the main beam, the secondary beam is staggered above the main beam, the reaction component is connected to the secondary beam, and fixes the secondary beam to the ground.

2. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 1, characterized in that: A bearing plate is arranged at the bottom of the loading assembly, and the area of ​​the bearing plate is not less than the projection area of ​​the loading assembly on the horizontal plane; the bearing plate is placed on the ground, and the bearing plate contacts the bottom surface of the loading assembly.

3. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 2, characterized in that: The bearing plate is also provided with a dial indicator, and the dial indicator is arranged in a plurality of positions along the circumference of the loading assembly.

4. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 3, characterized in that: The loading assembly includes a jack, an oil pump and a hydraulic gauge; the oil pump and the hydraulic gauge are connected to the jack, the bottom of the jack is arranged at the center of the bearing plate, and the top of the jack is arranged at the center of the main beam.

5. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 4, characterized in that: The reaction force component includes a prestressed enlarged head anchor rod, a PSB fine-rolled threaded steel bar, a loading anchor head and a loading plate; part of the end of the PSB fine-rolled threaded steel bar is nested in the stress enlarged head anchor rod, the stress enlarged head anchor rod is pre-buried under the ground where the test is conducted, and the loading plate and the loading anchor head are respectively arranged at the ends of the PSB fine-rolled threaded steel bar.

6. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 5, characterized in that: The secondary beam is provided with through holes for the PSB fine-rolled threaded steel bars to pass through, and the loading plate and the loading anchor head are respectively provided with threaded through holes that cooperate with the PSB fine-rolled threaded steel bars. The loading plate is in contact with the secondary beam, and the loading anchor head is arranged on the end of the loading plate away from the secondary beam.

7. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 6, characterized in that: The prestressed enlarged head anchor rod comprises a main rod and an auxiliary rod, wherein the auxiliary rod is arranged at the center of the main rod, and both the main rod and the auxiliary rod are cylindrical structures; the size of the main rod is not smaller than that of the auxiliary rod, so that the main rod and the auxiliary rod form a stepped structure on the contact surface.

8. The static load test system based on the reaction force of the anchor rod of the prestressed enlarged head of the precision rolled threaded steel bar according to claim 7, characterized in that: The PSB precision-rolled threaded steel bar is arranged through the auxiliary rod and extends to the lower end of the main rod, so that the PSB precision-rolled threaded steel bar and the prestressed enlarged head anchor rod form a stable integrated structure.

9. The static load test system based on the reaction force of the prestressed enlarged head anchor rod of the precision rolled threaded steel bar according to claim 8, characterized in that: The reaction force components are provided in two numbers, and are symmetrically arranged at the ends of both sides of the secondary beam.

10. A static load test system based on the reaction force of the prestressed enlarged head anchor rod of precision rolled threaded steel bar, characterized by: At least includes but is not limited to a loading component, a reaction component, a main beam and a secondary beam; the loading component is arranged below the main beam, a plurality of secondary beams are arranged above the main beam, the reaction component is connected to the secondary beam, and the secondary beam is fixed to the ground.

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