Pull-out test device for test block embedded rod

Abstract

The utility model discloses a pull-out test device for a test block embedded rod, which comprises a universal testing machine with an upper chuck and a lower chuck, an upper clamping rod is clamped on the upper chuck, and one end of the upper clamping rod is provided with a rod clamp; a lower clamping rod is clamped on the lower clamping head, a supporting bottom plate is arranged at one end of the lower clamping rod, two side plates are arranged on the supporting bottom plate, two vertical adjusting holes extending up and down are formed in the side plates, a guide column extending up and down is formed between the two vertical adjusting holes, and a locking ring is connected to the guide column in a sliding mode. The locking ring is in threaded connection with a locking screw with the end abutting against the guide column. The U-shaped blocking beam is arranged below the lock ring, the U-shaped blocking beam comprises two straight blocking rods arranged in parallel and a holding part connected with the two straight blocking rods, and each straight blocking rod is inserted into the same vertical adjusting hole of the two side plates. The device has the characteristics of convenience in test block clamping and accurate test structure, and is complete in overall function and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of test equipment, and more specifically, to a pull-out test device for a test block embedded rod. Background Art

[0002] In the Standard for Test Methods of Concrete Structures (GB / T 50152-2012), the pull-out test is as follows: Figure 3 As shown. Figure 3 It can be seen that the pull-out test used in the prior art has the following disadvantages:

[0003] 1. A T-shaped steel bar needs to be made and buried in the test block. The steel bar and the bamboo bar are pulled coaxially, so in the coaxial direction, the T-shaped steel bar occupies a large space, and the bamboo bar cannot be too close to the steel bar (too close will affect the test results). Therefore, the buried depth of the bamboo bar will be greatly limited;

[0004] 2. Due to the limited tensile capacity of concrete, there is a risk of damaging the concrete when T-shaped steel bars are buried in the pull-out test. At the same time, the heavy concrete test block is fixed in the air by T-shaped steel bars, and the concrete will be subjected to additional complex stress and deformation, which will affect the test results.

[0005] 3. If the method of inserting steel bars at the bottom of the mold is adopted, a large enough hole needs to be opened at the bottom of the test block mold to facilitate the insertion of steel bars; after the concrete is poured, since there are steel bars at the bottom of the test block mold, a porous table or a sufficiently strong support frame needs to be prepared;

[0006] 4. If the method of inserting steel bars from the side of the mold is adopted, it is not only troublesome to punch holes on both sides and damage the mold, but also the lateral deformation of the bamboo reinforcement over time during the curing period must be considered, and measures must be taken to prevent deformation; if the bamboo reinforcement is not punched in place, the data results of anti-slip performance will be affected;

[0007] 5. Since the bamboo reinforcement must be pulled out coaxially with the steel bar, only one bamboo reinforcement can be buried; at the same time, although each test block can be made under the condition of precise control of concrete mix ratio, curing conditions, etc., there are still differences between the test blocks, which affects the comparability of the anti-slip test data of each bamboo reinforcement;

[0008] 6. When the universal testing machine clamps the clamping end of the bamboo bar, the upper clamping piece of the testing machine clamps upward, which generates a huge clamping tension on the bamboo bar. The bamboo bar will undergo a stretching process before the test, and even the bamboo bar will be broken, resulting in the scrapping of the test object.

[0009] 7. If the pull-out test blocks are produced in large quantities, the above disadvantages will be multiplied. Due to the high density of concrete, each test block is not light. From the raw materials such as cement, gravel, sand (if more precise, gravel and sand of different particle sizes must be accurately weighed) in the concrete mix ratio, to the mixing, pouring, vibration and curing of concrete for 28 days, the handling and cleaning of test tools, the opening and demolding of molds, all highlight the heavier workload and low efficiency.

[0010] Based on this, the utility model proposes a pull-out test device for a test block embedded rod. Utility Model Content

[0011] The utility model aims to overcome the above-mentioned deficiencies in the prior art and provide a pull-out test device for a test block embedded rod.

[0012] In order to solve the above technical problems, the purpose of the utility model is achieved as follows: the utility model relates to a pull-out test device for a test block embedded rod, comprising a universal testing machine having an upper chuck and a lower chuck, wherein an upper clamping rod is clamped on the upper chuck, and a rod clamp is provided at one end of the upper clamping rod not connected to the upper chuck;

[0013] A lower clamping rod is clamped on the lower clamping head, and a supporting base plate is provided at one end of the lower clamping rod not connected to the lower clamping head, and two side plates are symmetrically arranged on the supporting base plate, and two vertical adjustment holes extending up and down are opened on the side plates, and a guide column extending up and down is formed between the two vertical adjustment holes, and a locking ring passing through the vertical adjustment hole is slidably connected to the guide column, and a locking screw with an end portion against the guide column is threadedly connected to the locking ring;

[0014] It also includes a U-shaped baffle beam arranged below the locking ring, the U-shaped baffle beam includes two straight baffle rods arranged parallel to each other and a gripping portion connecting the two straight baffle rods, each of the straight baffle rods is inserted into the same vertical adjustment hole of the two side plates.

[0015] The utility model is further configured as follows: the rod clamp comprises a square tube and a top plate arranged at one end of the square tube, the upper clamping rod is connected to the top plate, a fixed clamping plate connected to the side wall is arranged in the square tube, a movable clamping plate that moves towards or away from the fixed clamping plate is slidably connected in the square tube, the end of the movable clamping plate facing away from the fixed clamping plate is provided with a stud threadedly connected to the square tube, one end of the stud is rotatably connected to the movable clamping plate, and the other end is provided with a rotating part.

[0016] The utility model is further configured as follows: tooth grooves arranged in an up-and-down manner are arranged on the end of the fixed splint facing the movable splint and on the end of the movable splint facing the fixed splint.

[0017] The utility model is further configured as follows: a reinforcing rod is connected between the supporting bottom plate and the lower clamping rod.

[0018] The utility model is further configured as follows: the locking screw is a hand-tightening locking screw.

[0019] In summary, the utility model has the following beneficial effects:

[0020] 1. In the test block, there is no need to bury T-shaped steel bars or other components, so the burying depth and position of bamboo bars have great freedom; the influence of the burying of T-shaped steel bars is eliminated, and the deformation and damage of concrete due to steel bars are avoided, and no processing of the mold is required;

[0021] 2. The test block can be made of concrete or other materials, and the size can be adjusted according to the test requirements; the pull-out test rod can be made of bamboo or other materials, or the surface of the material can be painted with different coatings;

[0022] 3. If it is a concrete test block, it is not necessary to remove the mold. After the 28-day curing period, it can be fixed on the test device together with the mold to avoid damage to the embedded rod by removing the mold;

[0023] 4. When the size of the test block and the rod are matched, more rods can be arranged on one test block. For example, 4 pull-out rods with a diameter of less than 1 cm can be arranged in a 150mm×150mm×150mm test block. More accurate test data can be obtained through the pull-out data of the 4 rods. Alternatively, rods of different materials or rods with different surface treatments can be buried to obtain comparative data of the same concrete test block, which is more accurate and reliable.

[0024] 5. Since more rods can be arranged in the same test block, the utilization rate of the test block is improved, and the materials and workload of test block production are saved;

[0025] 6. First, clamp the upper clamping rod of the universal testing machine with the upper clamping piece, then move the upper part of the testing machine together with the rod clamp downward to an appropriate height, and finally clamp the pull-out test rod with the rod clamp. In this way, the testing machine clamping piece can avoid generating a huge clamping tension on the test rod, thereby avoiding the scrapping of the test object;

[0026] 7. The larger support base plate satisfies the change and adjustment of the test block position, allowing the test rods at different positions to be on the same axis as the lower clamping rod; at the same time, the vertical adjustment hole can support the test of test blocks of different sizes, including the arrangement of test blocks with molds;

[0027] 8. Compared with two independent guard beams, the U-shaped guard beam design increases the pressure-bearing stability and is easy to disassemble and assemble; the locking rings and locking screws on both sides are usually hung on the guide columns to avoid loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0029] Figure 2 It is a structural schematic diagram of the utility model from another perspective;

[0030] Figure 3 It is a schematic diagram of the existing pulling test. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the utility model, the preferred implementation scheme of the utility model is described below in conjunction with specific embodiments, but it should be understood that these descriptions are only for further illustrating the features and advantages of the utility model, rather than limiting the patent requirements of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0032] The utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0033] Example 1

[0034] See also Figure 1 and Figure 2 As shown, a pull-out test device for a pre-embedded rod of a test block according to this embodiment comprises a universal testing machine (not shown) having an upper chuck and a lower chuck, wherein an upper clamping rod 1 is clamped on the upper chuck, and a rod clamp is provided at one end of the upper clamping rod 1 that is not connected to the upper chuck;

[0035] A lower clamping rod 2 is clamped on the lower clamping head, and a supporting base plate 3 is provided at one end of the lower clamping rod 2 not connected to the lower clamping head, and two side plates 4 which are symmetrically arranged on the supporting base plate 3 are provided, and two vertical adjustment holes 5 which extend up and down are opened on the side plates 4, and a guide column 6 which also extends up and down is formed between the two vertical adjustment holes 5, and a locking ring 7 which passes through the vertical adjustment hole is slidably connected to the guide column 6, and a locking screw 8 whose end abuts against the guide column 6 is threadedly connected to the locking ring 7, and the locking screw 8 is a hand-tightening locking screw;

[0036] It also includes a U-shaped baffle beam arranged below the locking ring 7, the U-shaped baffle beam includes two straight baffle rods 9 arranged parallel to each other and a gripping portion 10 connecting the two straight baffle rods 9, each of the straight baffle rods 9 is inserted into the same vertical adjustment hole 5 of the two side plates 4.

[0037] Furthermore, the rod clamp includes a square tube 11 and a top plate 12 arranged at one end of the square tube 11, the upper clamping rod 1 is connected to the top plate 12, a fixed clamping plate 13 connected to the side wall is provided in the square tube 11, a movable clamping plate 14 is slidably connected in the square tube 11 and moves towards or away from the fixed clamping plate, and a stud 15 threadedly connected to the square tube is provided at one end of the movable clamping plate facing away from the fixed clamping plate, one end of the stud 15 is rotatably connected to the movable clamping plate 14, and a rotating part 16 is provided at the other end.

[0038] In this embodiment, when conducting a pull-out test on a test block of embedded rods, first clamp the lower clamping rod 2 with the lower chuck of the universal testing machine, place the test block of the embedded rod on the supporting base plate 3, and adjust the pull-out test rod and the lower clamping rod 2 to be on the same axis; then horizontally insert the straight baffle rod 9 on the U-shaped baffle beam into the vertical adjustment holes 5 on the two side plates 4, taking care not to scratch the test rod, and then move the locking ring 7 downward to compress the straight baffle rod 9 and the test block thereunder, and then tighten the locking screw 8; then clamp the upper clamping rod with the upper chuck of the universal testing machine, move the upper part of the testing machine together with the rod clamper downward to an appropriate height, so that the rod clamper clamps the pull-out test rod; finally, conduct a pull-out test on the embedded rod of the test block, and at the end of the rod test, loosen the rod clamper, lift the upper part of the testing machine, move the test block, and repeat the previous operation until all the embedded rods on the test block have completed the test.

[0039] Example 2

[0040] See also Figure 1 and Figure 2 As shown, the present embodiment involves a pull-out test device for a test block embedded rod, which is further configured on the basis of Embodiment 1, wherein tooth grooves (not marked) arranged vertically are arranged on the end of the fixed splint 13 facing the movable splint 14 and on the end of the movable splint 14 facing the fixed splint 13.

[0041] In this embodiment, by adding teeth and grooves, the friction force when the pull-out test rod is clamped by the fixed clamping plate 13 and the movable clamping plate 14 is increased, so that the clamping is firm and anti-slip.

[0042] Example 3

[0043] See also Figure 1 and Figure 2 As shown, the present embodiment involves a pull-out test device for a test block embedded rod, which is further configured on the basis of Embodiments 1 and 2, in which a reinforcing rod 17 is connected between the supporting base plate 3 and the lower clamping rod 2.

[0044] In this embodiment, the connection strength between the supporting base plate 3 and the lower clamping rod 2 is enhanced by adding the reinforcing rod 17 .

[0045] Unless otherwise specified, in the present invention, the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating orientation or positional relationship are based on the orientation or positional relationship actually shown, 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 orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood in combination with the embodiments and according to specific circumstances.

[0046] Unless otherwise clearly specified and limited, in the present invention, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A pull-out test device for a test block embedded rod, comprising a universal testing machine with an upper chuck and a lower chuck, characterized in that: An upper clamping rod is clamped on the upper clamping head, and a rod clamp is provided at one end of the upper clamping rod not connected to the upper clamping head; A lower clamping rod is clamped on the lower clamping head, and a supporting base plate is provided at one end of the lower clamping rod not connected to the lower clamping head, and two side plates are symmetrically arranged on the supporting base plate, and two vertical adjustment holes extending up and down are opened on the side plates, and a guide column extending up and down is formed between the two vertical adjustment holes, and a locking ring passing through the vertical adjustment hole is slidably connected to the guide column, and a locking screw with an end portion against the guide column is threadedly connected to the locking ring; It also includes a U-shaped baffle beam arranged below the locking ring, the U-shaped baffle beam includes two straight baffle rods arranged parallel to each other and a gripping portion connecting the two straight baffle rods, each of the straight baffle rods is inserted into the same vertical adjustment hole of the two side plates.

2. The pull-out test device for the test block embedded rod according to claim 1, characterized in that: The rod clamp includes a square tube and a top plate arranged at one end of the square tube, the upper clamping rod is connected to the top plate, a fixed clamping plate connected to the side wall is arranged in the square tube, a movable clamping plate that moves towards or away from the fixed clamping plate is slidably connected in the square tube, and a stud threadedly connected to the square tube is arranged at one end of the movable clamping plate facing away from the fixed clamping plate, one end of the stud is rotatably connected to the movable clamping plate, and a rotating part is arranged at the other end.

3. The pull-out test device for the test block embedded rod according to claim 2, characterized in that: Tooth grooves arranged in an up-and-down manner are arranged on the end of the fixed splint facing the movable splint and on the end of the movable splint facing the fixed splint.

4. The pull-out test device for the test block embedded rod according to any one of claims 1 to 3, characterized in that: A reinforcing rod is connected between the supporting bottom plate and the lower clamping rod.

5. The pull-out test device for the test block embedded rod according to claim 1, characterized in that: The locking screw is a hand-tightening locking screw.

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