An assembled floor connection structure

Abstract

This application discloses an assembled floor slab connection structure, relating to the technical field of building construction. It includes a floor slab and a connecting seat. A connecting groove is formed at the bottom of the floor slab, with a grouting space formed between the groove wall and the connecting seat. A grouting hole and an overflow hole are formed at the top of the floor slab. The floor slab is provided with multiple support plates. A connecting plate slides vertically on the connecting seat, and the connecting seat is provided with an elastic driving component. An abutment plate is movably provided on the connecting plate, and a locking block is provided on the side of the connecting plate away from the connecting seat. The abutment plate has a locking groove. A driving block is provided on the top of the connecting plate, and the driving block is inclined to form a driving surface. A driving plate is provided on the connecting seat, and a driving assembly is provided on the connecting seat. When the connecting seat approaches the grouting hole, the driving assembly drives the driving plate to slide on the driving surface. A power block is provided on the top of the support plate, and the power block is inclined to form a power surface. When the abutment plate slides on the power surface, the support plate moves away from the connecting seat. This application can reduce the possibility of deviations in the installation position of the floor slab.

Description

Technical Field

[0001] This application relates to the technical field of building construction, and in particular to a prefabricated floor slab connection structure. Background Technology

[0002] Prefabricated floor slabs are manufactured in a factory, transported to the construction site, and then installed and fixed.

[0003] Currently, during the production of floor slabs, cement holes are drilled at the corresponding column locations. During installation, the floor slab is placed on top of the column, and the bottom opening of the cement hole is sealed by the top end face of the column. To enhance the installation and fixing strength of the floor slab, cement is poured into the cement hole during connection, thus fixing the floor slab to the column with cement.

[0004] Regarding the aforementioned technologies, the inventors have discovered the following drawbacks: during assembly and fixing, there are a large number of floor slabs, and if the installation position of one floor slab deviates, it can easily affect other floor slabs, potentially causing misalignment between the cement holes and the building columns, leading to cement leakage. Summary of the Invention

[0005] To reduce the possibility of deviations in the installation position of floor slabs, this application provides an assembled floor slab connection structure.

[0006] This application provides a prefabricated floor slab connection structure, which adopts the following technical solution:

[0007] An assembled floor slab connection structure includes a floor slab and a connecting seat disposed on the top of a column. The bottom of the floor slab has a connecting groove for the connecting seat to be inserted. A grouting space is formed between the groove wall and the connecting seat. The top of the floor slab has a grouting hole and an overflow hole communicating with the grouting space.

[0008] The floor slab is provided with multiple support plates, which are located on the periphery of the connecting groove and connected end to end. Multiple connecting plates connected end to end slide up and down on the periphery of the connecting seat. The distance between the side walls facing each other relative to the support plates is greater than the distance between the side walls facing away from each other relative to the connecting plates. The connecting seat is provided with an elastic driving member that drives the connecting plates to slide upward.

[0009] The connecting plate is movably provided with an abutment plate on the side away from the connecting seat, and a locking block is provided on the side of the connecting plate away from the connecting seat. The abutment plate has a locking groove for the locking block to engage. When the locking block engages with the locking groove, the connected abutment plates abut against each other.

[0010] A driving block is provided on the top of the connecting plate. The driving block is inclined to form a driving surface facing the connecting seat. The connecting seat is provided with a driving plate and a driving assembly. When the connecting seat is close to the grouting hole, the driving assembly drives the driving plate to slide on the driving surface. When the driving plate slides on the driving surface, the connecting plate slides down to the bottom of the abutment plate and abuts the top of the support plate.

[0011] A power block is provided on the top of the support plate. The power block is inclined to form a power surface for the abutment plate to slide. When the abutment plate slides on the power surface, the support plate moves away from the connecting seat.

[0012] By adopting the above technical solution, during the construction of the building column, the connecting seat is pre-cast on the top of the building column. Then, the abutment plate is placed on the connecting plate, and the floor slab is hoisted above the building column and lowered so that the connecting seat is inserted into the connecting groove. The lowering of the floor slab is stopped when the connecting plate is above the support plate. At this point, a locking block is inserted into the locking groove, connecting and fixing the abutment plate to the connecting plate. The floor slab is then lowered further, allowing the connecting plate to move downwards until the abutment plate abuts against the support plate. During this contact, the abutment plate slides on the dynamic surface, correcting and restricting the position of the floor slab. Finally, cement is injected into the grouting space through the grouting hole until it overflows. The entire process is simple, allowing the abutment plate to easily enter the connecting groove without contacting the support plate, and correcting the position of the floor slab through the abutment plate, reducing the possibility of positional deviation.

[0013] Optionally, the drive assembly includes a drive column and a transmission column. The transmission column slides horizontally on the connecting seat. The transmission column corresponds to and is connected to the drive plate. The drive column slides up and down on the connecting seat, and the top of the drive column protrudes upward to the outside of the connecting seat. The drive column and the transmission column correspond to each other. The transmission column is inclined to form a transmission surface for the drive column to slide. When the drive column slides on the transmission surface, the transmission column slides outward from the connecting seat.

[0014] By adopting the above technical solution, when the drive column abuts against the top wall of the connecting groove, the drive part slides on the transmission surface, pushing the transmission column out of the connecting seat, so that the drive plate slides on the drive surface, which is conducive to pushing the connecting plate to move downward.

[0015] Optionally, when the abutting plate abuts against the top of the support plate, the driving column protrudes beyond the connecting seat.

[0016] By adopting the above technical solution, a gap is created between the top wall of the connecting groove and the top of the connecting seat, thereby increasing the contact area with cement.

[0017] Optionally, the transmission column is a long column structure.

[0018] By adopting the above technical solution, the transmission surface is kept aligned with the drive column.

[0019] Optionally, the abutment plate has a power column on the side near the connecting seat, and the top of the connecting plate has a receiving groove for accommodating the power column. The receiving groove has horizontally extending moving grooves on its opposite sides. The power column has a moving shaft that slides in the moving groove on the side away from the abutment plate. The receiving groove has an arc groove extending upwards along a circular arc trajectory on its opposite sides. The bottom of the arc groove is connected to the side of the moving groove away from the connecting seat. When the moving shaft slides from the moving groove into the arc groove, the abutment plate flips towards the top of the connecting plate, and the driving block slides into contact with the connecting plate. The connecting plate has a connector connecting the moving shaft and the driving block. When the driving block moves away from the connecting seat, the moving shaft slides from the arc groove into the moving groove and slides towards the connecting seat. When the moving shaft slides towards the connecting seat, the locking block engages with the locking slot.

[0020] By adopting the above technical solution, the moving shaft slides in the arc groove, which can drive the abutment plate to flip above the connecting plate, reducing the possibility of the abutment plate and the support plate colliding when the connecting seat enters the connecting groove.

[0021] Optionally, the connector is a connecting rope, which slides through the connecting plate, with one end connected to the outer periphery of the moving shaft and the other end connected to the drive block.

[0022] By adopting the above technical solution, when the drive block slides away from the connecting seat, the moving shaft is driven to slide by the connecting rope, so that the abutment plate can move to the side of the connecting plate away from the connecting seat, and drive the abutment plate to slide towards the connecting seat, so that the card block is locked into the card slot.

[0023] Optionally, the bottom of the connector is provided with a plug-in post for inserting into the room column, and multiple reinforcing posts are provided on the outer periphery of the plug-in post.

[0024] By adopting the above technical solution, the contact area between the reinforced column and the cement is increased, thereby improving the connection strength between the connecting seat and the building column.

[0025] Optionally, the side wall of the connecting seat is provided with a sliding groove, the connecting plate is provided with a slider that slides up and down in the sliding groove, the elastic driving component is a driving spring, the driving spring is installed in the sliding groove, one end of the driving spring abuts against the bottom of the slider, and the other end abuts against the groove wall.

[0026] By adopting the above technical solution, the drive spring is elastically released, pushing the connecting plate upward. The drive spring structure is simple and easy to use.

[0027] In summary, this application includes at least one of the following beneficial effects:

[0028] 1. During floor slab installation, the grouting space is sealed by the cooperation of the abutment plate, support plate and connecting plate. At the same time, the position of the floor slab is corrected by the sliding of the abutment plate against the power surface, which greatly reduces the possibility of deviation in the position of the floor slab.

[0029] 2. Before installation, flip the abutment plate over the connecting plate to reduce the possibility of the connector hitting the support plate when it is inserted into the connecting groove. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the external structure of an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the internal cross-section of an embodiment of this application;

[0032] Figure 3 This is a cross-sectional schematic diagram illustrating the grouting space being closed according to an embodiment of this application;

[0033] Figure 4 This is a schematic diagram illustrating the connection structure between the movable shaft and the connecting plate in an embodiment of this application;

[0034] Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0035] Reference numerals: 1. Floor slab; 2. Connecting seat; 21. Connecting groove; 22. Grouting space; 23. Grouting hole; 24. Overflow hole; 25. Support plate; 251. Power block; 252. Power surface; 26. Drive plate; 27. Transmission groove; 28. Drive groove; 29. ​​Insertion column; 291. Reinforcing column; 3. Connecting plate; 31. Locking block; 32. Drive block; 321. Drive surface; 33. Receiving groove; 34. Moving groove; 35. Arc groove; 36. Sliding block; 4. Abutment plate; 41. Locking groove; 42. Power column; 421. Moving shaft; 5. Drive assembly; 51. Drive column; 52. Transmission column; 521. Transmission surface; 6. Connecting rope; 7. Slide groove; 71. Drive spring. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0037] This application discloses an assembled floor slab connection structure. See also... Figure 1 and Figure 2, The assembled floor connection structure includes a floor slab 1 and a connection seat 2. The connection seat 2 is a cube structure. A plug-in column 29 is fixedly connected to the bottom of the connection seat 2, and the plug-in column 29 is pre-cast and fixed with the building column. A plurality of reinforcing columns 291 are fixedly connected to the outer peripheral side of the plug-in column 29. The reinforcing columns 291 are located inside the building column and are used to increase the contact area between the plug-in column 29 and the building column, thereby enhancing the installation and fixing strength of the connection seat 2.

[0038] See Figure 2 , A connection groove 21 corresponding to the connection seat 2 is opened at the bottom of the floor slab 1. The size of the notch of the connection groove 21 is much larger than the size of the top end face of the connection seat 2. When installing the floor slab 1, align the connection groove 21 with the connection seat 2, and then lower the floor slab 1 so that the connection seat 2 is inserted into the connection groove 21. A grouting space 22 is formed between the peripheral side wall of the connection groove 21 and the connection seat 2 for accommodating cement to fix the connection between the floor slab 1 and the connection seat 2.

[0039] See Figure 2 , The floor slab 1 is provided with support plates 25. There are multiple support plates 25, which are respectively fixed along the circumferential direction on the peripheral side wall of the connection groove 21. The adjacent support plates 25 are connected to each other, so that the support plates 25 are connected end to end to form a "square" structure. Connection plates 3 are respectively arranged on the upper and lower sides of the peripheral side wall of the connection seat 2 and are connected to each other, so that the connection plates 3 form a "square" structure.

[0040] See Figure 2 , The distance between the opposite side walls of the support plates 25 facing each other is greater than the distance between the opposite side walls of the connection plates 3 facing away from each other. When the connection seat 2 is inserted into the connection groove 21, the connection plates 3 can enter the connection groove 21. Slide grooves 7 are respectively opened on the peripheral side walls of the connection seat 2, and the slide grooves 7 extend in the vertical direction. Sliders 36 are respectively fixedly connected to the side of the connection plates 3 facing the connection seat 2, and the sliders 36 slide up and down in the slide grooves 7. The connection seat 2 is provided with an elastic driving member. The elastic driving member is a driving spring 71. The driving springs 71 correspond to the slide grooves 7 one by one and are installed in the slide grooves 7. One end of the driving spring 71 abuts against the bottom of the slider 36, and the other end abuts against the bottom wall of the slide groove 7. In the initial state, the driving spring 71 elastically releases and drives the connection plate 3 to move upward.

[0041] See Figure 2 And Figure 3 , A contact plate 4 is movably arranged on the side of the connection plate 3 away from the connection seat 2. A clamping groove 41 is opened on the side of the contact plate 4 facing the connection plate 3. A clamping block 31 with a positive trapezoidal structure is fixedly connected to the side of the connection plate 3 away from the connection seat 2. The clamping block 31 is clamped in the clamping groove 41 to connect the contact plate 4 and the connection plate 3. When the clamping block 31 is clamped in the clamping groove 41, the adjacent contact plates 4 contact each other. At this time, the contact plates 4 close the gap between the connection plate 3 and the support plate 25.

[0042] See Figure 2 and Figure 3 A driving block 32 is provided on the top of the connecting plate 3, and the driving block 32 is inclined to form a driving surface 321 facing the connecting seat 2. The side wall of the connecting seat 2 is provided with a driving plate 26 corresponding to the driving block 32. The connecting seat 2 is provided with a driving assembly 5. When the connecting seat 2 is inserted into the connecting groove 21 and away from the opening of the connecting groove 21, the driving assembly 5 drives the driving plate 26 to slide towards the driving block 32 until the driving plate 26 slides on the driving surface 321 and pushes the connecting plate 3 to slide downward until the abutment plate 4 abuts the support plate 25 and stops. At this time, the opening of the grouting hole 23 is in a closed state. The top of the floor slab 1 is provided with a grouting hole 23 and an overflow hole 24. The grouting hole 23 and the overflow hole 24 are respectively connected to the grouting space 22. Cement enters the grouting space 22 through the grouting hole 23 until the cement flows out from the overflow hole 24 and the grouting space 22 is full.

[0043] See Figure 2 The drive assembly 5 includes a drive column 51 and a transmission column 52. The sidewalls of the connecting seat 2 are respectively provided with transmission grooves 27 extending horizontally towards the center of the connecting seat 2. The transmission column 52 corresponds to the drive plate 26 and slides within the transmission grooves 27. The end of the transmission column 52 is fixed to the sidewall of the drive plate 26 facing the connecting seat 2. When the transmission column 52 slides outward from the transmission groove 27, the drive plate 26 slides away from the connecting seat 2.

[0044] See Figure 2 and Figure 3 The top of the connecting seat 2 has a drive groove 28 that corresponds one-to-one with the transmission groove 27. The drive groove 28 extends downward and connects to the transmission groove 27. The drive column 51 slides up and down in the drive groove 28. The transmission column 52 has a transmission surface 521 on the side away from the drive plate 26. The transmission column 52 has a long columnar structure, so that the transmission surface 521 is always facing the drive column 51. In the initial state, the drive plate 26 is located near the drive surface 321, and at this time the bottom of the drive column 51 abuts against the top of the transmission surface 521. When the connecting seat 2 is inserted into the connecting groove 21, the drive column 51 abuts against the groove wall of the connecting groove 21 away from the groove opening. At this time, the drive column 51 slides on the transmission surface 521, pushing the transmission column 52 to slide out of the transmission groove 27, so that the drive plate 26 slides on the drive surface 321 until it abuts against the support plate 25. At this time, the drive column 51 stops sliding. The drive column 51 protrudes out of the drive groove 28, so that the top of the connecting seat 2 and the groove wall of the connecting groove 21 have a certain distance, increasing the contact area between the connecting seat 2, the floor slab 1 and the cement.

[0045] See Figure 4 and Figure 5Two power columns 42 are symmetrically fixed in the horizontal direction on the side of the abutment plate 4 near the connecting plate 3. A receiving groove 33 is provided in the middle of the top of the connecting plate 3 and away from the connecting seat 2. The power columns 42 are accommodated and movably connected to the receiving groove 33.

[0046] See Figure 3 and Figure 5 Two moving shafts 421 are fixedly connected to opposite sides of the two power columns 42, away from the abutment plate 4. Moving grooves 34 extending horizontally towards the connecting seat 2 are respectively opened on opposite sides of the receiving groove 33. The moving shafts 421 slide within the moving grooves 34. When the moving shafts 421 slide towards the connecting seat 2 within the moving grooves 34, the locking block 31 engages with the locking groove 41.

[0047] See Figure 5 The receiving groove 33 has arc grooves 35 on its opposite side walls, extending upwards towards the connecting seat 2 and along an arc trajectory. One side of the bottom of the arc groove 35 connects to the side of the moving groove 34 away from the connecting seat 2. When the moving shaft 421 slides away from the connecting seat 2 in the moving groove 34, the locking block 31 begins to disengage from the locking slot 41, and when the moving shaft 421 is aligned with the arc groove 35, the locking block 31 moves away from the locking slot 41. Then, when the moving shaft 421 slides from the moving groove 34 into the arc groove 35, the power column 42 drives the abutment plate 4 to flip upwards until the abutment plate 4 flips above the connecting plate 3. At this time, when the connecting seat 2 is inserted into the connecting groove 21, the possibility of the support plate 25 colliding with the abutment plate 4 is reduced, which can greatly reduce the difficulty of inserting the connecting seat 2 into the connecting groove 21.

[0048] See Figure 3 and Figure 5 The drive block 32 is slidably connected to the connecting plate 3, and the top of the connecting plate 3 has an inverted "T"-shaped limiting groove. The bottom of the drive block 32 includes an inverted "T"-shaped limiting block, which slides within the limiting groove to reduce the possibility of the drive block 32 detaching from the connecting plate 3. The connecting plate 3 is provided with a connector for connecting the drive block 32 and the moving shaft 421. The connector is a connecting rope 6, which slides through the connecting plate 3. One end of the connecting rope 6 is fixed to the outer periphery of the moving shaft 421, and the other end is fixed to the limiting block. When the drive plate 26 moves away from the connecting seat 2, the drive plate 26 first pushes the drive block 32 away from the connecting seat 2. At this time, the connecting rope 6 pulls the moving shaft 421 to slide in the arc groove 35 towards the moving groove 34, so that the power column 42 drives the abutment plate 4 to flip towards the side of the connecting plate 3 away from the connecting seat 2. When the moving shaft 421 slides into the moving groove 34, the slot 41 faces the block 31. Then the drive block 32 continues to move, so that the moving shaft 421 slides in the moving groove 34 towards the connecting seat 2, driving the abutment plate 4 to approach the connecting plate 3, so that the block 31 is engaged in the slot 41, until the abutment plate 4 abuts the connecting plate 3. After that, the drive plate 26 slides on the drive surface 321, so that the connecting plate 3 slides downward.

[0049] The implementation principle of a prefabricated floor slab connection structure in this application embodiment is as follows:

[0050] During the column pouring construction, the connecting seat 2 is pre-cast and fixed to the top of the column. Then, the power column 42 is manually driven, causing the moving shaft 421 to slide into the arc groove 35, and the abutment plate 4 flips over to the top of the connecting plate 3. Next, the floor slab 1 is hoisted to the top of the column, and then slowly lowered, aligning the connecting seat 2 with the connecting groove 21 and inserting it until the drive column 51 abuts against the top wall of the connecting groove 21. At this time, the drive plate 26 pushes the drive block 32, causing the abutment plate 4 to flip to the side of the connecting plate 3 away from the connecting seat 2 and move towards the connecting seat 2, so that the locking block 31 slides into the locking groove 41, and the drive block 32 stops sliding. Then, the drive plate 26 slides on the drive surface 321, driving the connecting plate 3 to move downward, so that the abutment plate 4 slides on the power surface 252 to correct the position of the floor slab 1 until the abutment plate 4 abuts against the top of the support plate 25. Finally, cement is poured into the grouting space 22 through the grouting hole 23 until the cement is discharged from the overflow hole 24.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated floor slab connection structure, characterized in that: The system includes a floor slab (1) and a connecting seat (2) located at the top of the column. The bottom of the floor slab (1) has a connecting groove (21) for the connecting seat (2) to be inserted. A grouting space (22) is formed between the groove wall of the connecting groove (21) and the connecting seat (2). The top of the floor slab (1) has a grouting hole (23) and an overflow hole (24) that communicate with the grouting space (22). The floor slab (1) is provided with multiple support plates (25). The support plates (25) are located on the periphery of the connecting groove (21) and are connected end to end. Multiple connecting plates (3) are connected end to end and slide up and down on the periphery of the connecting seat (2). The distance between the side walls facing each other relative to the support plates (25) is greater than the distance between the side walls facing away from each other relative to the connecting plates (3). The connecting seat (2) is provided with an elastic driving member that drives the connecting plates (3) to slide upward. The connecting plate (3) has an abutment plate (4) movably disposed on the side away from the connecting seat (2), and a locking block (31) is disposed on the side of the connecting plate (3) away from the connecting seat (2). The abutment plate (4) has a slot (41) for the locking block (31) to engage. When the locking block (31) engages in the slot (41), the connected abutment plates (4) abut against each other. The top of the connecting plate (3) is provided with a driving block (32), the driving block (32) is inclined to form a driving surface (321) facing the connecting seat (2), the connecting seat (2) is provided with a driving plate (26), the connecting seat (2) is provided with a driving assembly (5), when the connecting seat (2) is close to the grouting hole (23), the driving assembly (5) drives the driving plate (26) to slide on the driving surface (321), when the driving plate (26) slides on the driving surface (321), the connecting plate (3) slides down to the bottom of the abutment plate (4) and abuts the top of the support plate (25); The top of the support plate (25) is provided with a power block (251), and the power block (251) is inclined to form a power surface (252) for the abutment plate (4) to slide. When the abutment plate (4) slides on the power surface (252), the support plate (25) moves away from the connecting seat (2). The abutment plate (4) is provided with a power column (42) on the side near the connecting seat (2). The top of the connecting plate (3) is provided with a receiving groove (33) for accommodating the power column (42). The receiving groove (33) is provided with horizontally extending moving grooves (34) on the opposite sides of the groove. The power column (42) is provided with a moving shaft (421) sliding in the moving groove (34) on the side away from the abutment plate (4). The receiving groove (33) is provided with an arc groove (35) extending upward along an arc trajectory on the opposite sides of the groove. The bottom of the arc groove (35) is connected to the side of the moving groove (34) away from the connecting seat (2). The moving shaft (421) moves from the moving groove (34) to the connecting seat (2). When the moving groove (34) slides into the arc groove (35), the abutment plate (4) flips towards the top of the connecting plate (3), and the driving block (32) slides into contact with the connecting plate (3). The connecting plate (3) is provided with a connector connecting the moving shaft (421) and the driving block (32). When the driving block (32) moves away from the connecting seat (2), the moving shaft (421) slides from the arc groove (35) into the moving groove (34) and slides in the moving groove (34) towards the connecting seat (2). When the moving shaft (421) slides in the moving groove (34) towards the connecting seat (2), the locking block (31) locks into the locking slot (41).

2. The assembled floor slab connection structure according to claim 1, characterized in that: The drive assembly (5) includes a drive column (51) and a transmission column (52). The transmission column (52) slides horizontally on the connecting seat (2). The transmission column (52) corresponds to and is connected to the drive plate (26). The drive column (51) slides up and down on the connecting seat (2) and the top of the drive column (51) protrudes upward to the outside of the connecting seat (2). The drive column (51) corresponds to the transmission column (52). The transmission column (52) is inclined to form a transmission surface (521) for the drive column (51) to slide. When the drive column (51) slides on the transmission surface (521), the transmission column (52) slides outward from the connecting seat (2).

3. The assembled floor slab connection structure according to claim 2, characterized in that: When the abutting plate (4) abuts against the top of the support plate (25), the driving column (51) protrudes out of the connecting seat (2).

4. The assembled floor slab connection structure according to claim 2, characterized in that: The transmission column (52) is a long column structure.

5. The assembled floor slab connection structure according to claim 1, characterized in that: The connector is a connecting rope (6), which slides through the connecting plate (3). One end of the connecting rope (6) is connected to the outer periphery of the moving shaft (421), and the other end is connected to the drive block (32).

6. The assembled floor slab connection structure according to claim 1, characterized in that: The bottom of the connector (2) is provided with a plug-in column (29) for inserting a house column, and a plurality of reinforcing columns (291) are provided on the outer periphery of the plug-in column (29).

7. The assembled floor slab connection structure according to claim 1, characterized in that: The connecting seat (2) has a sliding groove (7) on its side wall. The connecting plate (3) is provided with a slider (36) that slides up and down in the sliding groove (7). The elastic driving component is a driving spring (71). The driving spring (71) is installed in the sliding groove (7). One end of the driving spring (71) abuts against the bottom of the slider (36), and the other end abuts against the groove wall of the sliding groove (7).

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