A device and method for testing the shear resistance of a pre-embedded component

Abstract

The application provides a pre-embedded part shearing test device and method, the test device comprising: a clamp suitable for horizontally placing an upper end of a T-joint pre-embedded part; a concrete base connected to a lower surface of the clamp, the concrete base being suitable for fixing a lower end of the T-joint pre-embedded part; a loading mechanism connected to one side surface of the clamp through a connecting screw; a force support mechanism comprising a force plate vertically connected to a side surface of the concrete base and a support plate horizontally supported on a lower surface of the loading mechanism, one side of the connecting screw away from the loading mechanism penetrating through the force plate of the force support mechanism and being connected to the clamp. The application also provides a pre-embedded part shearing test method, which can accurately measure the shearing performance of a weld of a T-joint pre-embedded part, especially for the welding of embedded parts such as steel bar-plate friction welding and submerged arc stud welding, and can accurately evaluate the shearing performance of the weld.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pre-embedded shear test device, in particular to a pre-embedded shear test device and method. BACKGROUND

[0002] For the pre-embedded welded joint of steel bar-plate, the commonly used welding methods include shielded arc welding, gas shielded welding, submerged arc stud welding and other arc welding. Such welded joints are widely used in nuclear power construction. When there is a requirement for the shear resistance of such welded joints, it is necessary to detect the pure shear resistance of the welded joint after welding, especially for new welding methods (such as friction welding, submerged arc stud welding, etc.), it is necessary to test and evaluate the shear resistance of the welded joint.

[0003] A split pre-embedded shear test device is provided in CN206618642U. The experimental device is for slot-type pre-embedded parts, uses T-type anchor bolts to fix the embedded parts, and uses a jack to apply force. Finally, the shear load and deformation of the embedded part can be measured.

[0004] However, the above device is not suitable for steel bar-plate T-joint pre-embedded parts, and the shear force measured by the device is the shear force between the slot-type pre-embedded part and the concrete, which cannot be applied to the steel bar-plate T-joint pre-embedded part.

[0005] Therefore, how to accurately measure the shear resistance of the steel bar-plate T-joint pre-embedded part at the welded joint and overcome the defects in the prior art is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0006] To solve the above problems, the present application provides a pre-embedded shear test device for measuring the shear resistance of a T-joint pre-embedded part, comprising:

[0007] a clamp adapted to horizontally place the upper end of the T-joint pre-embedded part;

[0008] a concrete base connected to the lower surface of the clamp, the concrete base being adapted to fix the lower end of the T-joint pre-embedded part;

[0009] a loading mechanism connected to one side of the clamp through a connecting screw;

[0010] a force supporting mechanism comprising a force plate vertically connected to the side of the concrete base and a support plate horizontally supported on the lower surface of the loading mechanism,

[0011] the connecting screw is connected to the clamp through the force plate of the force supporting mechanism away from the side of the loading mechanism.

[0012] Further, the clamp is a rectangular structure, a rectangular through hole and a threaded through hole are formed in the clamp, the rectangular through hole vertically penetrates the upper and lower surfaces of the clamp, and the threaded through hole horizontally penetrates one side of the clamp.

[0013] Further, the T-shaped embedded part comprises a steel bar and a steel plate welded on the top of the steel bar, the steel plate is adapted to be placed in the rectangular through hole of the clamp, and the steel bar is adapted to be vertically embedded in the concrete base.

[0014] Further, the size of the steel plate ranges from 100 to 150 mm.

[0015] Further, the loading mechanism comprises a hollow jack, a pressure sensor and a connecting end cover which are sequentially threaded on the connecting screw rod, the hollow jack is close to the surface of the stress plate on one side, the connecting end cover is adapted to be threadedly connected on the connecting screw rod and is close to the outer end surface of the pressure sensor.

[0016] Further, the support plate is an I-shaped steel structure, which is adapted to support the loading mechanism.

[0017] Further, a film is further arranged between the steel plate and the concrete base.

[0018] Further, a plurality of mounting holes are formed in the side surface of the concrete base, a connecting hole corresponding to the mounting hole is formed in the stress plate, and a screw rod is adapted to pass through the connecting hole and the mounting hole to fixedly connect the stress plate to the concrete base.

[0019] Further, the depth of the rectangular through hole is greater than the thickness of the steel plate.

[0020] Compared with the prior art, the present application has the following advantages and effects:

[0021] The pre-embedded part shear test device provided by the present application comprises a concrete base for embedding a T-shaped embedded part, a clamp, a stress support mechanism and a loading mechanism, the clamp is placed on the steel plate of the embedded part to be tested, the front end of the clamp is in complete contact with the steel plate of the embedded part, a connecting screw rod is threaded through the upper end through hole of the stress support mechanism and is threadedly connected with the clamp, the loading mechanism is loaded, the shear force is transmitted to the clamp and the steel plate of the T-shaped embedded part in the clamp through the connecting screw rod and the stress support mechanism, the damage of the embedded part is observed during the loading process, the shear resistance of the welded joint of the T-shaped embedded part can be measured, especially for the welding of the embedded part such as steel bar-plate friction welding and submerged arc stud welding, the shear resistance of the welded joint can be accurately evaluated. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1A schematic view of a shear test device for a pre-embedded part according to an embodiment of the present application is provided.

[0023] Figure 2 Another direction structure schematic view of a shear test device for a pre-embedded part according to an embodiment of the present application is provided.

[0024] Figure 3 A front view structure schematic view of a shear test device for a pre-embedded part according to an embodiment of the present application is provided.

[0025] Figure 4 A top view structure schematic view of a shear test device for a pre-embedded part according to an embodiment of the present application is provided.

[0026] Figure 5 A side view structure schematic view of a shear test device for a pre-embedded part according to an embodiment of the present application is provided.

[0027] Figure 6 A sectional view structure schematic view between a T-shaped pre-embedded part and a concrete base according to an embodiment of the present application is provided.

[0028] Figure 7 A structure schematic view of a T-shaped pre-embedded part according to an embodiment of the present application is provided.

[0029] Figure 8 A flowchart of a shear test method for a pre-embedded part according to an embodiment of the present application is provided.

[0030] Reference signs:

[0031] 1 - clamp; 11 - rectangular through hole; 12 - threaded through hole;

[0032] 2 - concrete base; 21 - mounting hole; 22 - connecting rod; 23 - cavity; 211 - clamp mounting hole; 212 - threaded hole; 221 - center hole;

[0033] 3 - loading mechanism;

[0034] 31 - hollow jack; 32 - pressure sensor; 33 - connecting end cap;

[0035] 4 - force support mechanism;

[0036] 41 - force plate; 411 - connecting hole; 42 - support plate;

[0037] 5 - connecting screw;

[0038] 6 - T-shaped pre-embedded part;

[0039] 61 - steel bar; 62 - steel plate. DETAILED DESCRIPTION

[0040] In order to make the above objectives, characteristics and advantages of the present application more apparent, concrete embodiments of the present application will be described in detail below with reference to the drawings.

[0041] In the description of the present application, it should be noted that unless specifically defined and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal connection of two elements, or wireless connection, or wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] In addition, the front, back, up, down and other orientation words involved in the present application are defined according to the position of the parts in the drawings and the position of the parts relative to each other in the drawings, which is only for the purpose of expressing the clarity and convenience of the technical scheme. It should be understood that the use of the orientation words should not limit the scope of the present application.

[0043] Please refer to Figures 1-7 As shown in the drawings, the embodiments of the present application provide a shear test device for embedded part, which is used for determining the shear performance of T joint embedded part 6, and the test device comprises a clamp 1, a concrete base 2, a loading mechanism 3, a force supporting mechanism 4 and a connecting screw 5, wherein:

[0044] The clamp 1 is suitable for horizontally placing the upper end of the T joint embedded part 6 to form fixation on the end of the T joint embedded part 6.

[0045] The concrete base 2 is connected to the lower surface of the clamp 1, and the concrete base 2 is suitable for fixing the lower end of the T joint embedded part 6. In this way, the lower end of the T joint embedded part 6 is embedded in the concrete base 2, thereby realizing the overall fixation of the T joint embedded part 6.

[0046] The loading mechanism 3 is connected to one side surface of the clamp 1 through the connecting screw 5, and the loading mechanism 3 can provide shear force acting on the weld of the T joint embedded part 6 through loading.

[0047] The force supporting mechanism 4 comprises a force plate 41 vertically connected to the side surface of the concrete base 2 and a supporting plate 42 horizontally supported on the lower surface of the loading mechanism 3, wherein the force plate 41 is used for transmitting the shear force implemented by the loading mechanism 3 to the T joint embedded part 6, and the supporting plate 42 is used for providing a horizontal supporting platform for the loading mechanism 3 to facilitate better implementation of the loading force.

[0048] The supporting plate 42 is placed at the lower part of the loading mechanism 3 and is used for supporting the whole device. Preferably, the structure of the supporting plate 42 is not limited in form, and even an automatic lifting device can be used, which can be suitable for supporting in different heights.

[0049] The connecting screw rod 5 is connected to the clamp 1 through the force plate 41 of the force support mechanism 4 far away from the loading mechanism 3. One end of the connecting screw rod 5 is connected to the loading mechanism 3, and the other end is connected to the clamp 1, so that the shearing force of the loading mechanism 3 can be transmitted to the weld of the T-joint embedded part 6 in the clamp 1.

[0050] Specifically, referring to Figure 1 In the embodiment of the present application, the clamp 1 is a rectangular structure, and the rectangular through hole 11 vertically penetrates the upper and lower surfaces of the clamp 1, and the threaded through hole 12 horizontally penetrates one side of the clamp 1.

[0051] Therefore, the rectangular through hole 11 can be used to accommodate the upper end of the T-joint embedded part 6, and the threaded through hole 12 can transmit the shearing force applied by the loading mechanism 3 to the clamp, and then to the upper end of the T-joint embedded part 6 through the clamp 1.

[0052] Specifically, referring to Figure 6 In the embodiment of the present application, the T-joint embedded part 6 includes a steel bar 61 and a steel plate 62 welded on the top of the steel bar 61, the steel plate 62 is adapted to be placed in the rectangular through hole 11 of the clamp 1, and the steel bar 61 is adapted to be vertically embedded in the concrete base 2.

[0053] It should be particularly noted that the T-joint embedded part 6 can include a plurality of uniformly distributed steel plates 62 and steel bars 61, and the steel bars 61 and the steel plates 62 are arranged one by one.

[0054] In addition, the T-joint embedded part 6 can be arranged in a ring shape as shown in Figures 1-2 While considering the spacing between the embedded parts to prevent interference between the clamp 1 and the embedded parts.

[0055] Specifically, referring to Figure 6 In the embodiment of the present application, the size of the steel plate 62 ranges from 100 to 150 mm.

[0056] Therefore, the welded steel bar-plate embedded part is cut into a suitable size, generally 100*100mm-150*150mm, and the cutting method is cold working, including but not limited to sawing, wire cutting and the like. In addition, the cut embedded part should include a complete single steel bar 61, a steel plate 62 and a steel plate weld.

[0057] Specifically, referring to Figure 6As shown in the embodiment of the present application, the loading mechanism 3 comprises a hollow jack 31, a pressure sensor 32 and a connecting end cover 33 which are sequentially arranged on the connecting screw 5, the hollow jack 31 is close to the surface of the force plate 41, and the connecting end cover 33 is adapted to be screwed on the connecting screw 5 and is close to the outer end surface of the pressure sensor 32.

[0058] Thus, the hollow jack 31 and the pressure sensor 32 are sequentially sleeved on the connecting screw 5, the connecting end cover 33 is fixed on the rear end of the connecting screw 5 by screwing, and the gap between the pressure sensor 32, the hollow jack 31 and the force plate 41 is ensured as small as possible during connection.

[0059] Specifically, referring to Figure 2 As shown in the embodiment of the present application, the support plate 42 is an I-shaped steel structure, which is adapted to support the loading mechanism 3 and provide support for the hollow jack 31 and the pressure sensor 32.

[0060] Specifically, referring to Figure 6 As shown in the embodiment of the present application, a film is further arranged between the steel plate 92 and the concrete base 2.

[0061] When the embedded part is embedded, the lower surface of the embedded part steel plate is close to the surface of the concrete, and in order to avoid the contact between the steel plate 62 and the concrete base 2, a film is used to isolate the steel plate 62 and the concrete before pouring the concrete.

[0062] Specifically, referring to Figure 3 As shown in the embodiment of the present application, the side surface of the concrete base 2 is provided with a plurality of mounting holes 21 which are uniformly distributed, the force plate 41 is provided with a plurality of connecting holes 411 which correspond to the mounting holes 21 one by one, and the screw is adapted to pass through the connecting holes 411 and the mounting holes 21 to fix and connect the force plate 41 to the concrete base 2.

[0063] In the embodiment, the upper end of the force plate 41 is provided with a through hole, the lower end is provided with four connecting holes 411, the end of the connecting screw 5 is connected with the clamp 1 and passes through the upper end of the force plate 41, the hollow jack 31 and the pressure sensor 32, and the other end is connected with the connecting end cover 33, and the lower end of the force plate 41 is connected with the concrete base 2 through four screws.

[0064] Preferably, in the embodiment, the depth of the rectangular through hole 11 is greater than the thickness of the steel plate 62.

[0065] Working process: the force plate 41 is fixedly installed on the concrete base 2, pressure is applied through the hollow jack 31, under the reaction force of the force plate 41, the load applied by the elongation of the hollow jack 31 is transmitted to the pressure sensor 32 and the connecting end cover 33, the connecting end cover 33 is connected with the connecting screw 5, therefore, the shear load can be applied through the connecting screw 5 and the clamp 1, and the real-time size of the shear force can also be measured and read through the pressure sensor 32, with the continuous increase of the shear load, until the steel plate 62 of the embedded part is sheared, at this time, the load measured by the pressure sensor 32 is the maximum shear force.

[0066] Please refer to Figure 8 The embodiment of the application also provides a shear test method of the embedded part, and the test method comprises the following steps:

[0067] Step S 100 : the embedded part to be measured is welded, and the embedded part to be measured is cut into a single T joint embedded part 6 with a proper size through a cold working method;

[0068] In the embodiment, the welded steel bar-plate embedded part is cut into a shape with a proper size, generally 100*100mm-150*150mm, and the cutting method is cold working, including but not limited to sawing, wire cutting and the like, and in addition, the embedded part after cutting should include a complete single steel bar 61, a steel plate 62 and a weld.

[0069] Step S 200 : a cuboid mold is made, and the T joint embedded parts 6 are placed in the cuboid mold in an inverted manner, the lower surface of the steel plate 62 of the T joint embedded part 6 is closely attached to the surface of the concrete when placed, and a film is placed between the steel plate 62 and the concrete for insulation;

[0070] The concrete with a corresponding strength is selected, the embedded parts are placed in an inverted manner (the steel plates 62 are on the top), and the concrete is poured, when the embedded parts are embedded, the lower surface of the steel plate of the embedded part is closely attached to the surface of the concrete, and in order to avoid the contact connection between the steel plate 62 and the concrete, the film is used to isolate the steel plate 62 and the concrete before pouring the concrete.

[0071] Step S 300 : the T joint embedded parts 6 are poured on the concrete with a corresponding strength, and are vibrated, smoothed and maintained, and the maintenance period is generally 28 days.

[0072] Step S 400 : the shear test device is installed, the shear force is tested and recorded in sequence, and the maximum shear force value is recorded;

[0073] When the shear test is performed, in order to prevent the concrete base 2 from being cracked and damaged or the steel bar 61 from being directly pulled off, the length of the embedded part steel bar and the strength of the concrete can be appropriately increased.

[0074] Step S500 : Shear test is completed, and the shear test device is removed.

[0075] Although the present disclosure has been disclosed with reference to the above embodiments, the scope of protection of the present disclosure is not limited to this. Those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present disclosure, and these modifications and changes will fall within the scope of the present disclosure.

Claims

1. A device for testing the shear resistance of a T-connector (6), characterized in that include: The clamp (1) is a rectangular structure. The clamp (1) has a rectangular through hole (11) and a threaded through hole (12). The rectangular through hole (11) vertically penetrates the upper and lower surfaces of the clamp (1). The clamp (1) is suitable for horizontally placing the upper end of the T-connector embedded part (6) through the rectangular through hole (11). A concrete substrate (2) is connected to the lower surface of the clamp (1). The concrete substrate (2) is adapted to fix the lower end of the T-connector embedded part (6). The side of the concrete substrate (2) is provided with a number of evenly distributed mounting holes (21). The T-connection embedded part (6) includes a reinforcing bar (61) and a steel plate (62) welded to the top of the reinforcing bar (61). The steel plate (62) is adapted to be placed in the rectangular through hole (11) of the clamp (1). A thin film is also provided between the steel plate (62) and the concrete matrix (2). The depth of the rectangular through hole (11) is greater than the thickness of the steel plate (62). The loading mechanism (3) is connected to the threaded through hole (12) of the clamp (1) via a connecting screw (5); The force-bearing support mechanism (4) includes a force-bearing plate (41) vertically connected to the side of the concrete substrate (2) and a support plate (42) horizontally supported on the lower surface of the loading mechanism (3). The force-bearing plate (41) has connecting holes (411) corresponding to the mounting holes (21). The screw is adapted to pass through the connecting holes (411) and the mounting holes (21) to fix the force-bearing plate (41) to the concrete substrate (2). The connecting screw (5) on the side away from the loading mechanism (3) passes through the force plate (41) of the force support mechanism (4) and connects to the threaded through hole (12) of the clamp (1).

2. The device of claim 1, wherein The threaded through hole (12) extends horizontally through one side of the clamp (1).

3. The device of claim 1, wherein, The steel bar (61) is suitable for vertical embedding in the concrete matrix (2).

4. The device of claim 3, wherein When clamped, the steel plate (62) has a size range of 100-150 mm.

5. The device of claim 3, wherein The loading mechanism (3) includes a hollow jack (31), a pressure sensor (32) and a connecting end cap (33) sequentially mounted on the connecting screw (5). The hollow jack (31) is close to the surface of the force plate (41) on one side. The connecting end cap (33) is threaded onto the connecting screw (5) and is close to the outer end face of the pressure sensor (32).

6. The device of claim 5, wherein, The support plate (42) is an I-beam structure, suitable for supporting the loading mechanism (3).

7. A method of testing the shear resistance of a preform, characterized in that, The shear resistance test apparatus for embedded parts according to any one of claims 1-6 is used, and the test method includes: Step S 100 : The to-be-tested embedded part is welded, and the to-be-tested embedded part is cut into a single T-shaped embedded part (6) of appropriate size by a cold working method; Step S 200 : Make a cuboid mold, and place a plurality of the T-shaped embedded parts (6) upside down in the cuboid mold, with the lower surface of the steel plate (62) of the T-shaped embedded part (6) tightly attached to the surface of the concrete, and a film is placed between the steel plate (62) and the concrete. Step S 300 : Pouring a plurality of the T-junction embedded parts (6) on concrete of corresponding strength, and vibrating, troweling and curing; Step S 400 : Install the shear test device, test the shear strength one by one, and record the maximum shear force value; Step S 500 : The shearing test is completed, and the shearing test device is removed.

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