Concrete compressive strength detection device

Abstract

The utility model discloses a concrete compressive strength detection device, which belongs to the technical field of concrete detection and comprises a base, stand columns are fixedly mounted at four corners of the base, a protective frame is fixedly mounted at the top end of the base, a transparent adhesive layer is arranged in the protective frame, and a mounting frame is fixedly mounted at the bottom end of the base. A collecting frame is slidably mounted in the mounting frame, driving wheels are arranged at the four corners of the bottom end of the collecting frame, a clamping assembly is arranged between the collecting frame and the mounting frame, a placing table is slidably mounted in the protective frame, and a lifting groove matched with the placing table is formed in the bottom end of the base. A concrete test block is arranged on the inner wall of the protection frame, the concrete test block is supported by the placement table, then the test plate and the placement table are matched for extrusion, the test effect can be achieved, the protection frame is beneficial to preventing the concrete test block from splashing around when the concrete test block is broken, the protection effect is achieved, and subsequent cleaning by workers is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete detection, and more specifically, to a device for detecting the compressive strength of concrete. Background Technique

[0002] With the continuous development of the times, China has achieved rapid development in the construction field. Among them, as the main building material, the performance strength of concrete will directly affect the safety of buildings. One of the main indicators of concrete quality is its compressive capacity, and the compressive strength directly affects the resistance of concrete. When using concrete, it is necessary to detect its compressive strength.

[0003] The patent with the application number 202123276833.5 discloses a device for detecting the compressive strength of concrete, which includes a detection table and a pressing mechanism arranged on the detection table. A clamping device is arranged on the detection table. The clamping device includes a plurality of clamping plates for fixedly clamping concrete blocks, a sliding block for driving the plurality of clamping plates to clamp the concrete blocks, and a driving mechanism for driving the sliding block to slide. The driving mechanism is arranged on the detection table. This application has the effect of being able to reduce the phenomenon that the concrete block shakes when the pressing mechanism applies force to the concrete block, thereby improving the accuracy of detection.

[0004] In view of the above related technologies, through the setting of a plurality of clamping plates, the function of clamping and fixing the concrete block is achieved, which helps to avoid the phenomenon of shaking when the concrete block is detected. However, the concrete is crushed under the continuous pressure of the equipment until it is crushed, and then the detection function is achieved. There is no protective structure around the concrete block. When the concrete is crushed under the pressure, it may fly everywhere, and some may fly out of the equipment and are inconvenient to clean, and the flying blocks may hurt the nearby staff. Content of the Utility Model

[0005] In order to solve the above problems, the utility model provides a device for detecting the compressive strength of concrete, and adopts the following technical scheme:

[0006] A device for detecting the compressive strength of concrete includes a base. Columns are fixedly installed at the four corners of the base. A protective frame is fixedly installed at the top of the base, and a transparent adhesive layer is arranged inside the protective frame. An installation frame is fixedly installed at the bottom of the base. A collection box is slidably installed inside the installation frame. Driving wheels are arranged at the four corners of the bottom of the collection box. A clamping component is arranged between the collection box and the installation frame. A placement table is slidably installed inside the protective frame. A lifting groove matching the placement table is opened at the bottom of the base. A lifting component is arranged between the bottom of the placement table and the collection box. A clamping component is arranged inside the protective frame;

[0007] A mounting frame is fixedly installed at the top end of the base, and a control console is fixedly installed on one side of the mounting frame. A first cylinder is fixedly installed at the top end of the mounting frame. The piston shaft end of the first cylinder slidably penetrates through the mounting frame and is fixedly installed with a connecting block. A test plate is arranged below the connecting block. A pressure sensor is arranged between the test plate and the connecting block. A spring is sleeved on the side wall of the pressure sensor.

[0008] By adopting the above technical solutions, when the device is in use, the staff drives the placing table to move out from the upper port of the protection frame through the lifting assembly, which is convenient for the staff to place the concrete test block on the top of the placing table. After the concrete test block is placed, the placing table with the concrete test block is driven by the lifting assembly to move into the protection frame, and then the concrete test block is clamped and fixed by the clamping assembly, which helps to avoid the phenomenon of the concrete test block shifting during the test. After the concrete test block is clamped, the connecting block and the test plate are driven by the first cylinder to descend, so that the test plate contacts the top of the concrete test block. Under the continuous push of the first cylinder, the function of testing the concrete test block can be achieved. And the pressure sensor is arranged between the test plate and the connecting block, which can play the role of testing pressure. A spring is sleeved on the side wall of the pressure sensor, which can play the role of buffer protection. The concrete test block is crushed and splashed under the action of pressure. The concrete test block is located in the protection frame, and the placing table and the test plate are located in the protection frame, which can play the role of blocking the protection frame. The concrete test block is crushed under the action of pressure, and the protection frame can play the role of protecting the broken pieces of the concrete test block from splashing everywhere. And a transparent adhesive layer is arranged in the protection frame, which can play the role of buffer, achieving the effect of protecting the protection frame. The protection frame is made of transparent material, which is convenient for the staff to check the test situation of the concrete test block.

[0009] A collection box is arranged below the base. The collection box is fixed to the mounting frame installed at the bottom end of the base through the clamping assembly. After the concrete test block is tested, the placing table and the broken pieces are moved into the collection box through the lifting groove by the lifting assembly, which can play the role of collecting the broken materials. After the staff cleans the broken materials on the placing table, the placing table can be driven by the lifting assembly to move into the protection frame again, which is convenient for re-testing. The bottom of the collection box is provided with driving wheels, which is convenient for the staff to disassemble and move the collection box to clean the broken materials.

[0010] Furthermore, the clamping assembly includes sliders fixedly installed on both sides of the upper section of the collection box. Sliding grooves matching with the sliders on the same side are formed in the inner wall of the mounting frame. Limiting rods are fixedly installed in the sliding grooves. The sliders are slidably sleeved on the side walls of the same group of limiting rods.

[0011] By adopting the above technical solution, the staff moves the collection box under the base, so that the slider installed on the side wall of the collection box engages with the chute opened on the inner wall of the mounting frame, and a limiting rod is arranged in the chute. The slider is slidably sleeved on the side wall of the same group of limiting rods. Through the cooperation of the slider, the chute and the limiting rod, the function of restricting and fixing the collection box can be achieved.

[0012] Furthermore, two symmetrically distributed insertion blocks are fixedly installed on one side of the collection box, and a slot matching the insertion blocks is opened on the inner wall of one side of the mounting frame.

[0013] By adopting the above technical solution, through the arrangement of the insertion blocks on the side wall of the collection box, when the collection box moves into the mounting frame, the insertion blocks engage with the slots opened on the side wall of the mounting frame. Through the engagement of the insertion blocks and the slots, the function of further fixing the collection box can be achieved.

[0014] Furthermore, the lifting assembly includes a mounting box fixedly installed on the inner wall of the bottom end of the collection box. A third cylinder is fixedly installed in the mounting box. The piston shaft of the third cylinder slidably penetrates through the mounting box, and the end of the piston shaft of the third cylinder is fixedly connected to the bottom end of the placement table.

[0015] By adopting the above technical solution, by driving the placement table to slide in the protection frame through the third cylinder, the function of adjusting the position of the placement table can be achieved, which is convenient for the staff to place and clean the concrete test blocks.

[0016] Furthermore, the clamping assembly includes two clamping plates arranged in the protection frame. Two symmetrically distributed second cylinders are fixedly installed on the top end of the base. The piston shafts of the two second cylinders both slidably penetrate into the protection frame, and the ends of the piston shafts of the two second cylinders are fixedly connected to the opposite sides of the same group of clamping plates. Rubber pads are fixedly installed on the opposite sides of the two clamping plates. Grooves matching the clamping plates on the same side are opened on the inner wall of the protection frame.

[0017] By adopting the above technical solution, when the placement table moves the concrete test block into the protection frame, by driving the same group of clamping plates to move through the second cylinder, through the cooperation of the two clamping plates, the function of clamping and fixing the concrete test block can be achieved. Rubber pads are arranged on the opposite sides of the two clamping plates, which is beneficial to increasing the friction between the clamping plates and the concrete test block, and further beneficial to improving the stability of the placement of the concrete test block, and helps to avoid the deviation of the concrete test block during testing. Through the opening of the grooves on the inner wall of the protection frame, it is convenient to store the clamping plates, and further convenient for the placement table to lift and slide in the protection frame.

[0018] Furthermore, two symmetrically distributed stabilizing blocks are fixedly installed on the four sides of the protection frame. The bottom ends of the stabilizing blocks are all fixedly connected to the top end of the base. Connecting plates are fixedly installed between the two stabilizing blocks in the same group. Strengthening rods are arranged between the two stabilizing blocks and the connecting plates in the same group.

[0019] By adopting the above technical solution, the outer side of the protection frame is provided with stabilizing blocks, connecting plates and reinforcing rods, which play a role in stabilizing the protection frame, are beneficial to increasing the bearing capacity of the protection frame, and thus are beneficial to reducing the damage force generated when the concrete test block flies to the inner wall of the protection frame during crushing, achieving the effect of protecting the protection frame.

[0020] To sum up, the utility model includes the following beneficial technical effects:

[0021] (1) In the utility model, the concrete test block is placed on the inner wall of the protection frame and supported by the placing table. Subsequently, through the cooperation and extrusion of the test plate and the placing table, the test can be carried out. The protection frame helps to prevent the concrete test block from flying everywhere when it is crushed, achieving the protection effect and facilitating the subsequent cleaning by the staff.

[0022] (2) In the utility model, the protection frame is made of a transparent material, which is convenient for the staff to view the test situation. And a transparent adhesive layer is provided inside the protection frame, which can play a buffering role. The outer side of the protection frame is cooperated with stabilizing blocks, connecting plates and reinforcing rods to play a role in stabilizing the protection frame, which is beneficial to maintaining the protection effect of the protection frame.

[0023] (3) In the utility model, through the setting of the collection box, the placing table is driven by the lifting assembly to lift, so that the placing table is moved out through the upper port of the protection frame, which is convenient for the staff to place the concrete test block. Subsequently, the concrete test block is moved into the protection frame by the lifting assembly, and the concrete test block can be clamped and fixed by the clamping assembly, which helps to prevent the concrete test block from shifting during the test. When the test is completed, the data is observed through the console, and then the placing table is driven by the lifting assembly to move the crushed concrete into the collection box, which can play a role in collecting the debris. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a device for detecting the compressive strength of concrete; <�

[0025] Figure 2 For the present utility model Figure 1 The enlarged view of A;

[0026] Figure 3 It is a sectional view of the present utility model;

[0027] Figure 4 For the present utility model Figure 3 The enlarged view of B;

[0028] Figure 5 It is a display diagram of the clamping component and the lifting component in the present utility model;

[0029] Figure 6 For the present utility model Figure 5Enlarged view of C.

[0030] Description of reference numerals in the figure:

[0031] 1. Base; 2. Stabilizing block; 3. Connecting plate; 4. Protective frame; 5. Mounting frame; 6. Test board; 7. Connecting block; 8. First cylinder; 9. Second cylinder; 10. Collection box; 11. Mounting bracket; 12. Slide block; 13. Limiting rod; 14. Lifting groove; 15. Clamping plate; 16. Placing table; 17. Third cylinder; 18. Mounting box; 19. Pressure sensor; 20. Spring; 21. Insert block; 22. Chute. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] The following will be further described in detail in conjunction with the attached Figures 1-6 This utility model will be further described in detail.

[0036] Please refer to Figures 1-6, a device for detecting the compressive strength of concrete, including a base 1. Columns are fixedly installed at the four corners of the base 1. A protective frame 4 is fixedly installed at the top end of the base 1, and a transparent adhesive layer is provided inside the protective frame 4. An installation frame 11 is fixedly installed at the bottom end of the base 1. A collection box 10 is slidably installed inside the installation frame 11. Driving wheels are provided at the four corners of the bottom end of the collection box 10. A clamping component is provided between the collection box 10 and the installation frame 11. The clamping component includes sliders 12 fixedly installed on both sides of the upper section of the collection box 10. Sliding grooves 22 matching the sliders 12 on the same side are opened on the inner wall of the installation frame 11. Limiting rods 13 are fixedly installed in the sliding grooves 22. The sliders 12 are slidably sleeved on the side walls of the same group of limiting rods 13. The staff moves the collection box 10 under the base 1, so that the sliders 12 installed on the side wall of the collection box 10 are engaged with the sliding grooves 22 opened on the inner wall of the installation frame 11, and limiting rods 13 are provided in the sliding grooves 22. The sliders 12 are slidably sleeved on the side walls of the same group of limiting rods 13. Through the cooperation of the sliders 12, the sliding grooves 22 and the limiting rods 13, the function of restricting and fixing the collection box 10 can be achieved, which is convenient for subsequent collection of broken materials.

[0037] Two symmetrically distributed insertion blocks 21 are fixedly installed on one side of the collection box 10. A slot matching the insertion blocks 21 is opened on the inner wall of one side of the installation frame 11. Through the arrangement of the insertion blocks 21 on the side wall of the collection box 10, when the collection box 10 is moved into the installation frame 11, the insertion blocks 21 are engaged with the slots opened on the side wall of the installation frame 11. Through the engagement of the insertion blocks 21 and the slots, the function of further fixing the collection box 10 is achieved.

[0038] A placement table 16 is slidably installed inside the protective frame 4. A lifting groove 14 matching the placement table 16 is opened at the bottom end of the base 1. A lifting component is provided between the bottom end of the placement table 16 and the collection box 10. The lifting component includes an installation box 18 fixedly installed on the inner wall of the bottom end of the collection box 10. A third cylinder 17 is fixedly installed inside the installation box 18. The piston rod of the third cylinder 17 slidably penetrates through the installation box 18, and the end of the piston rod of the third cylinder 17 is fixedly connected to the bottom end of the placement table 16. By driving the placement table 16 to slide inside the protective frame 4 by the third cylinder 17, the function of adjusting the position of the placement table 16 can be achieved. The placement table 16 is moved out from the upper port of the protective frame 4, which is convenient for the staff to place the concrete test block on the top of the placement table 16. After the concrete test block is placed, the placement table 16 and the concrete test block are driven into the protective frame 4 by the third cylinder 17, which is convenient for subsequent testing.

[0039] The protective frame 4 is provided with a clamping assembly. The clamping assembly includes two clamping plates 15 arranged inside the protective frame 4. Two symmetrically distributed second cylinders 9 are fixedly installed at the top end of the base 1. The piston shafts of the two second cylinders 9 both slide through the protective frame 4, and the ends of the piston shafts of the two second cylinders 9 are fixedly connected to the opposite sides of the same group of clamping plates 15. Rubber pads are fixedly installed on the opposite sides of the two clamping plates 15. Grooves matching the same-side clamping plates 15 are formed on the inner wall of the protective frame 4. After the placement table 16 moves the concrete test block into the protective frame 4, the same group of clamping plates 15 are driven to move by the second cylinders 9. Through the cooperation of the two clamping plates 15, the function of clamping and fixing the concrete test block can be achieved. Rubber pads are provided on the opposite sides of the two clamping plates 15, which is beneficial to increasing the friction between the clamping plates 15 and the concrete test block, and further beneficial to improving the stability of the placement of the concrete test block, helping to avoid the offset of the concrete test block during testing. Through the formation of grooves on the inner wall of the protective frame 4, it is convenient to store the clamping plates 15, and further convenient for the placement table 16 to lift and slide inside the protective frame 4.

[0040] An installation frame 5 is fixedly installed at the top end of the base 1, and a control console is fixedly installed on one side of the installation frame 5. A first cylinder 8 is fixedly installed at the top end of the installation frame 5. The end of the piston shaft of the first cylinder 8 slides through the installation frame 5 and is fixedly installed with a connecting block 7. A test plate 6 is arranged below the connecting block 7. A pressure sensor 19 is arranged between the test plate 6 and the connecting block 7. A spring 20 is sleeved on the side wall of the pressure sensor 19.

[0041] After the concrete test block is clamped, the connecting block 7 and the test plate 6 are driven to descend by the first cylinder 8, so that the test plate 6 contacts the top of the concrete test block. Under the continuous push of the first cylinder 8, the function of testing the concrete test block can be achieved. And through the setting of the pressure sensor 19 between the test plate 6 and the connecting block 7, the function of testing pressure can be achieved. A spring 20 is sleeved on the side wall of the pressure sensor 19, which can play a role in buffering and protecting. When the concrete test block is crushed and splashed under the action of pressure, the concrete test block is located inside the protective frame 4, and the placement table 16 and the test plate 6 are located inside the protective frame 4, which can play a role in blocking the protective frame 4. When the concrete test block is crushed under the action of pressure, the protective frame 4 can play a role in preventing the broken pieces of the concrete test block from splashing everywhere. And there is a transparent glue layer inside the protective frame 4, which can play a role in buffering and achieve the effect of protecting the protective frame 4. The protective frame 4 is made of transparent material, which is convenient for the staff to view the test situation of the concrete test block.

[0042] Two symmetrically distributed stabilizing blocks 2 are fixedly installed around the protective frame 4. The bottom ends of the stabilizing blocks 2 are fixedly connected to the top end of the base 1. A connecting plate 3 is fixedly installed between the two stabilizing blocks 2 in the same group. Strengthening rods are provided between the two stabilizing blocks 2 and the connecting plate 3 in the same group. The arrangement of the stabilizing blocks 2, the connecting plate 3 and the strengthening rods on the outer side of the protective frame 4 plays a role in stabilizing the protective frame 4, which is beneficial to increasing the bearing capacity of the protective frame 4, thereby being beneficial to reducing the damage force generated when the concrete test block is crushed and flies to the inner wall of the protective frame 4, achieving the effect of protecting the protective frame 4.

[0043] The implementation principle of the embodiment of the present utility model is as follows: When the device is in use, the staff drives the placing table 16 to move out from the upper port of the protective frame 4 through the lifting assembly, which is convenient for the staff to place the concrete test block on the top of the placing table 16. After the concrete test block is placed, the placing table 16 is driven by the lifting assembly to move the concrete test block into the protective frame 4. Subsequently, the concrete test block is clamped and fixed by the clamping assembly, which helps to avoid the phenomenon of the concrete test block shifting during the test. After the concrete test block is clamped, the first cylinder 8 drives the connecting block 7 and the test plate 6 to descend, so that the test plate 6 contacts the top of the concrete test block. Under the continuous push of the first cylinder 8, the function of testing the concrete test block can be achieved. And the pressure sensor 19 is arranged between the test plate 6 and the connecting block 7, which can play a role in testing pressure. A spring 20 is sleeved on the side wall of the pressure sensor 19, which can play a role in buffering and protecting. The concrete test block is crushed and splashed under the action of pressure. The concrete test block is located in the protective frame 4, and the placing table 16 and the test plate 6 are located in the protective frame 4, which can play a role in blocking the protective frame 4. The concrete test block is crushed under the action of pressure, and the protective frame 4 can play a role in protecting the broken pieces of the concrete test block from flying everywhere. And a transparent glue layer is provided in the protective frame 4, which can play a role in buffering, achieving the effect of protecting the protective frame 4. The protective frame 4 is made of transparent material, which is convenient for the staff to check the test situation of the concrete test block.

[0044] A collection box 10 is provided below the base 1. The collection box 10 is fixedly installed with the mounting frame 11 installed at the bottom end of the base 1 through the clamping assembly. After the concrete test block is tested, the placing table 16 and the broken pieces are moved into the collection box 10 through the lifting groove 14 by the lifting assembly, which can play a role in collecting the broken materials. After the staff cleans the broken materials on the placing table 16, the placing table 16 can be driven by the lifting assembly to move into the protective frame 4 again, which is convenient for testing again. The bottom of the collection box 10 is provided with driving wheels, which is convenient for the staff to disassemble and move the collection box 10 to clean the broken materials.

[0045] The above are all the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A device for detecting the compressive strength of concrete, comprising a base (1), characterized in that: Four columns are fixedly installed at the four corners of the base (1). A protective frame (4) is fixedly installed at the top of the base (1), and a transparent adhesive layer is provided inside the protective frame (4). An installation frame (11) is fixedly installed at the bottom end of the base (1). A collection box (10) is slidably installed inside the installation frame (11). Driving wheels are provided at the four corners of the bottom end of the collection box (10). A clamping component is provided between the collection box (10) and the installation frame (11). A placement table (16) is slidably installed inside the protective frame (4). A lifting groove (14) matching the placement table (16) is opened at the bottom end of the base (1). A lifting component is provided between the bottom end of the placement table (16) and the collection box (10). A clamping component is provided inside the protective frame (4). An installation frame (5) is fixedly installed at the top of the base (1), and a control console is fixedly installed on one side of the installation frame (5). A first cylinder (8) is fixedly installed at the top of the installation frame (5). The piston shaft end of the first cylinder (8) slidably penetrates through the installation frame (5) and is fixedly installed with a connecting block (7). A test plate (6) is provided below the connecting block (7). A pressure sensor (19) is provided between the test plate (6) and the connecting block (7). A spring (20) is sleeved on the side wall of the pressure sensor (19).

2. The concrete compressive strength testing device according to claim 1, characterized in that: The clamping component includes sliders (12) fixedly installed on both sides of the upper section of the collection box (10). Sliding grooves (22) matching the sliders (12) on the same side are opened on the inner wall of the installation frame (11). Limiting rods (13) are fixedly installed in the sliding grooves (22). The sliders (12) are slidably sleeved on the side walls of the same group of limiting rods (13).

3. A concrete compressive strength testing device according to claim 1, characterized in that: Two symmetrically distributed insertion blocks (21) are fixedly installed on one side of the collection box (10). A slot matching the insertion blocks (21) is opened on the inner wall of one side of the installation frame (11).

4. A device for detecting the compressive strength of concrete according to claim 1, characterized in that: The lifting component includes an installation box (18) fixedly installed on the inner wall of the bottom end of the collection box (10). A third cylinder (17) is fixedly installed inside the installation box (18). The piston shaft of the third cylinder (17) slidably penetrates through the installation box (18), and the end of the piston shaft of the third cylinder (17) is fixedly connected to the bottom end of the placement table (16).

5. The concrete compressive strength testing device according to claim 1, wherein: The clamping component includes two clamping plates (15) arranged inside the protective frame (4). Two symmetrically distributed second cylinders (9) are fixedly installed at the top of the base (1). The piston shafts of the two second cylinders (9) both slidably penetrate into the protective frame (4), and the ends of the piston shafts of the two second cylinders (9) are fixedly connected to the opposite sides of the same group of clamping plates (15). Rubber pads are fixedly installed on the opposite sides of the two clamping plates (15). Grooves matching the clamping plates (15) on the same side are opened on the inner wall of the protective frame (4).

6. The concrete compressive strength detection device according to claim 1, characterized in that: Two symmetrically distributed stabilizing blocks (2) are fixedly installed around the protective frame (4). The bottom ends of the stabilizing blocks (2) are fixedly connected to the top of the base (1). Connecting plates (3) are fixedly installed between the two stabilizing blocks (2) in the same group. Reinforcing rods are provided between the two stabilizing blocks (2) and the connecting plates (3) in the same group.

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