A method for repairing a heavily damaged concrete-filled steel tubular column by using a sleeve sandwiched concrete

Abstract

The application relates to a sleeve sandwiched concrete repairing method of a heavily damaged steel pipe concrete column, and belongs to the technical field of concrete column repairing, which comprises the following steps: S1, installing a sleeve: installing two mutually spliced annular arc-shaped plates outside a damaged column body by using a repairing device to form a sleeve, wherein a containing cavity is formed between the sleeve inner diameter and the column body; and S2, pouring concrete into the containing cavity to complete column body repairing. The application has the effects of saving cost and improving resource utilization.

Description

Technical Field

[0001] The present application relates to the technical field of concrete column repair, and in particular to a method for repairing a severely damaged steel tube concrete column with a casing sandwich concrete. Background Art

[0002] Steel tube concrete columns are made by pouring concrete inside steel tubes. When in use, the axial bearing capacity of the internal concrete is improved under the circumferential constraint of the external steel tube. At the same time, the concrete reduces the local bending of the external steel tube. Therefore, it is widely used in actual engineering.

[0003] After a certain number of years of use, the performance of the steel tube concrete structure will be reduced due to construction quality defects, concrete breakage, steel pipe corrosion and other problems. In addition, earthquakes, impacts, etc. can easily cause damage to the steel tube concrete columns, and the steel tube concrete columns need to be repaired.

[0004] A common repair method is to dismantle and rebuild the damaged steel tube concrete columns, which easily results in a large waste of manpower, time and economic costs, affecting resource utilization. Summary of the Invention

[0005] In order to save costs and improve resource utilization, the present application provides a method for repairing severely damaged steel tube concrete columns with interlayer concrete.

[0006] The present application provides a method for repairing severely damaged concrete-filled steel tube columns using the following technical solutions:

[0007] A method for repairing casing sandwich concrete of a severely damaged concrete-filled steel tube column comprises the following steps:

[0008] S1. Installing the casing: Using a repair device, two circular arc plates are installed on the outside of the damaged column body to form a casing. At this time, a receiving cavity is formed between the inner diameter of the casing and the column body;

[0009] S2. Pour concrete into the accommodating cavity to complete the repair of the column body.

[0010] By adopting the above technical solution, when repairing damaged steel tube concrete, a sleeve with an inner diameter larger than the outer diameter of the damaged column body is sleeved on the outside of the column body. At this time, a accommodating cavity is formed between the inner wall of the sleeve and the outer wall of the column body, and concrete is poured into the accommodating cavity. When the concrete solidifies, the diameter of the new steel tube concrete formed increases, thereby saving costs, improving resource utilization, and increasing the bearing capacity of the steel tube concrete.

[0011] Optionally, the repair device includes a frame and limiting members installed on both sides of the upper end of the frame, the lower side of the limiting members is provided with a clamping member for clamping the arc plate, the clamping member is slidably connected to the two sides of the frame, and a second screw is provided on both sides of the frame to drive the clamping member to move, and a first motor fixedly connected to the frame is installed at one end of the second screw.

[0012] By adopting the above technical solution, when the arc plate is installed on the outside of the column body, the limit members on both sides of the driving frame abut against the two sides of the column body. At this time, the arc plate is tightened by the clamping member, and the clamping member is driven by the first motor and the second screw to move in the direction of approaching each other until the arc plates are spliced ​​together, thereby facilitating the installation of the sleeve on the outside of the column body, and when concrete is poured into the accommodating cavity, the clamping member and the limit member support the arc plate, reducing the possibility of the arc plates separating from each other under the drive of concrete, thereby improving the stability of the arc plate.

[0013] Optionally, the clamping member includes a limiting rod that is plugged into and slidably connected to one side of the frame body, and the arc-shaped plate is provided with a limiting hole that is adapted to the limiting rod. A clamping plate is provided on the upper side of the limiting rod, and the upper end of the clamping plate is bent downward toward the direction close to the column body. A clamping groove perpendicular to the length direction of the limiting rod is provided on the limiting rod, and one bent end of the clamping plate is clamped to the upper end of the arc plate through the clamping groove.

[0014] By adopting the above technical solution, the limit rod is inserted into the limit hole on the arc plate, and the clamping plate is driven to move upward, so that the bent end of the clamping plate is clamped on the upper end of the arc plate. At this time, the first motor drives the second screw to rotate, driving the limit rod and the arc plate to move toward each other until the arc plates are spliced ​​together, thereby facilitating the installation of the sleeve on the outside of the column body and supporting the arc plate, thereby achieving the effect of saving costs and improving resource utilization.

[0015] Optionally, a sliding groove parallel to the length direction of the limiting rod is provided on the limiting rod, and the clamping plate slides along the sliding groove. The clamping groove is located at one end of the sliding groove, and the upper side of the other end of the sliding groove is also connected to the clamping groove. The limiting rod is provided with a connecting piece for driving the clamping plate to move, and the bent end of the clamping plate and the side close to the column body are set as an inclined surface inclined downwardly toward the side away from the column body.

[0016] By adopting the technical scheme, the arc-shaped plate is sleeved on the corresponding limiting rod and moves towards the clamping plate, the clamping plate moves away from the column body under the pushing of the arc-shaped plate, when the clamping plate moves to one end of the sliding groove away from the column body, the arc-shaped plate is continuously pushed, the arc-shaped plate is in contact with the inclined surface on the clamping plate and the clamping plate moves upwards until the clamping plate is clamped on the upper end of the arc-shaped plate, so that the clamping plate is clamped on the arc-shaped plate without additional driving source, and the arc-shaped plate is conveniently driven to move.

[0017] Optionally, the connecting piece comprises a connecting ring inserted into the limiting rod and sliding along the length direction of the limiting rod, one end of the second lead screw is inserted into the limiting rod and threadedly connected with the connecting ring, the upper side of the connecting ring is fixedly connected with a connecting plate, the ends of the connecting plate away from each other are both inserted through the limiting rod and slidingly connected with the limiting rod, the side of the clamping plate away from the column body is fixedly connected with a connecting rod, and the end of the connecting rod away from the clamping plate is inserted through the connecting plate and clamped with the connecting plate.

[0018] By adopting the technical scheme, when the clamping plate is clamped on the upper end of the arc-shaped plate, the clamping plate is continuously moved until the connecting rod is inserted into the connecting plate and clamped with the connecting plate, at this time, the first motor drives the second lead screw to rotate, the connecting ring drives the arc-shaped plate to move towards the column body until the distance between the inner side wall of the arc-shaped plate and the end of the limiting rod is equal to the width of the poured concrete, at this time, the lead screw is continuously rotated, the connecting ring abuts against the inner side wall of the limiting rod and pushes the limiting rod to move towards the column body until the limiting rod abuts against the column body, at this time, the arc-shaped plates are spliced with each other, thereby further saving cost and improving resource utilization.

[0019] Optionally, the two sides of the frame body are both rotationally connected with a driving column, the limiting rod is inserted into and slidingly connected with the corresponding driving column, and the frame body is provided with a second motor for driving the driving column to rotate.

[0020] By adopting the technical scheme, when the arc-shaped plate is installed, the second motor drives the driving column to drive the limiting rod to rotate away from each other, so that the arc-shaped plate is conveniently installed on the limiting rod and the installation efficiency is improved.

[0021] Optionally, the limiting piece comprises a limiting ring rotationally connected to one side of the upper end of the frame body, a first lead screw towards the column body is inserted into and threadedly connected with the middle part of the limiting ring, the first lead screw is slidingly connected with the frame body, and the end of the first lead screw penetrating through the limiting ring abuts against the upper end of the column body.

[0022] By adopting the technical scheme, the limiting ring is driven to rotate and the first lead screw is driven to move towards each other until the ends of the first lead screw away from each other abut against the upper end of the column body, so that the contact area of the frame body and the column body is increased and the stability of the frame body is improved.

[0023] Optionally, one of the arc-shaped plates is fixedly connected to a plug-in block on both sides in the vertical direction, and the other arc-shaped plate is provided with a plug-in slot adapted to the plug-in block on both sides. When the arc-shaped plates are spliced ​​together, the plug-in block is plugged into the plug-in slot.

[0024] By adopting the above technical solution, when splicing with each other, the plug-in blocks are plugged into the corresponding plug-in grooves, thereby increasing the contact area between the arc-shaped plates and improving stability.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. A sleeve with an inner diameter larger than the outer diameter of the damaged column body is sleeved onto the outside of the column body. A receiving cavity is formed between the inner wall of the sleeve and the outer wall of the column body. Concrete is poured into the receiving cavity. When the concrete solidifies, the diameter of the new steel tube concrete increases, thereby saving costs, improving resource utilization, and increasing the bearing capacity of the steel tube concrete.

[0027] 2. The arc plate is sleeved on the corresponding limit rod and moves in the direction close to the clamping plate. The clamping plate moves in the direction away from the column body under the push of the arc plate. When the clamping plate moves to the end of the sliding groove away from the column body, the arc plate is pushed further, and the arc plate contacts the inclined surface on the clamping plate and moves the clamping plate upward until the bent end of the clamping plate is clamped on the upper end of the arc plate. In this way, the clamping plate is clamped on the arc plate without adding an additional driving source, which facilitates the driving of the arc plate to move.

[0028] 3. When the clamping plate is connected to the upper end of the arc plate, continue to move the clamping plate until the clamping plate is inserted into the connecting plate and connected to the connectable plate. At this time, the first motor drives the second screw to rotate, and the connecting ring drives the arc plate toward the direction close to the column body until it moves to the distance between the inner wall of the arc plate and the end of the limit rod is equal to the width of the poured concrete. At this time, continue to rotate the screw, the connecting ring abuts on the inner wall of the limit rod and pushes the limit rod to move toward the direction close to the column body until it abuts against the column body. At this time, the arc plates are spliced ​​with each other, which further saves costs and improves resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the casing sandwich concrete repair device for severely damaged steel tube concrete columns in an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the overall structure reflecting the positional relationship between the clamping member and the limiting member in the embodiment of the present application.

[0031] Figure 3It is a schematic diagram of the overall structure reflecting the positional relationship between the clamping member and the connecting member in the embodiment of the present application.

[0032] Explanation of the accompanying drawings: 1. Arc plate; 11. Limiting hole; 2. Column body; 3. Frame; 31. Limiting member; 311. Limiting ring; 312. Belt; 313. Mounting rod; 314. Driving motor; 315. First lead screw; 316. Abutment plate; 32. Driving column; 321. Rotating shaft; 322. First gear; 323. Second gear; 324. Second motor; 325. Moving groove; 33. Mounting seat; 4. Clamping member; 41. Limiting rod; 411. Sliding groove; 412. Clamping groove; 413. Connecting hole; 42. Clamping plate; 5. Connecting member; 51. Connecting ring; 52. Connecting plate; 521. Waist-shaped hole; 53. Connecting rod; 531. Accommodating groove; 54. Clamping member; 541. Clamping block; 542. Spring; 55. Second lead screw; 56. First motor; 6. Cylinder. DETAILED DESCRIPTION

[0033] The present application is further described in detail below with reference to the accompanying drawings.

[0034] The present invention discloses a method for repairing a severely damaged concrete-filled steel tube column with a casing sandwich concrete layer. The method comprises the following steps:

[0035] S1. Install the casing: refer to Figure 1 and Figure 2 Using a repair device, two circularly joined curved plates (1) are installed on the outside of the damaged column body (2). In this embodiment, one curved plate (1) has vertical plug-in blocks (not shown) fixedly connected on both sides in the vertical direction, while the other curved plate (1) has plug-in slots (not shown) on both sides in the vertical direction. When the curved plates (1) are joined together, the plug-in blocks are inserted into the corresponding plug-in slots. This increases the contact area between the curved plates (1) and improves stability.

[0036] Reference Figure 1 and Figure 2The repair device includes a frame 3, with both sides of the upper end of the frame 3 provided with a limit member 31 for clamping the column body 2. The limit member 31 includes a vertical limit ring 311 rotatably connected to one side of the upper end of the frame 3. A vertical belt 312 is installed on the side of the limit ring 311 that is away from each other. The other end of the belt 312 is located on the upper end of the frame 3 and away from the limit ring 311. The end of the belt 312 away from the limit ring 311 is plugged into and fixedly connected to the same horizontal mounting rod 313, and a drive motor 314 is installed on one end of the mounting rod 313. A horizontal first screw 315 is passed through and threadedly connected to the limit ring 311. The first screw 315 is slidably connected to the frame 3 (not shown in the figure), and an arc-shaped and oppositely arranged abutment plate 316 is fixedly connected to the side of the first screw 315 that is close to each other.

[0037] Both ends of the frame 3, near the retaining ring 311, are rotatably connected to vertical drive columns 32. The lower ends of the drive columns 32 are rotatably connected to mounting bases 33. A rotating shaft 321 is inserted and fixedly connected to the lower end of the drive column 32. The lower end of the rotating shaft 321 is inserted into and rotatably connected to the mounting base 33. A first gear 322, which is fixedly connected to the rotating shaft 321, is inserted and rotatably connected to the mounting base 33. A second gear 323 meshes with the side of the first gear 322 that is away from the first gear 322. A second motor 324 is mounted on the axis of the upper side of the second gear 323. A clamping member 4 for clamping the curved plate 1 is provided in the middle of each drive column 32.

[0038] The drive limit ring 311 rotates and drives the first screw 315 to move in the direction of approaching each other until the abutment plates 316 abut against the upper end of the column body 2. The second motor 324 drives the drive column 32 to drive the clamping part 4 to rotate in the direction of moving away from each other, and installs the arc plate 1 on the clamping part 4. The drive column 32 is driven to rotate until the clamping part 4 is opposite. The clamping part 4 drives the arc plate 1 to approach each other and plug into forming a sleeve. At this time, an accommodating cavity is formed between the inner wall of the sleeve and the outer wall of the column body 2. Concrete is poured into the accommodating cavity. When the concrete solidifies, the repair of the column body 2 is completed.

[0039] Reference Figure 1 and Figure 2 The clamping member 4 includes a horizontal limiting rod 41 disposed in the middle of the driving column 32. A horizontal movement slot 325 is defined in the middle of the driving column 32. One end of the limiting rod 41 is inserted into the corresponding movement slot 325 and is slidably connected to the driving column 32. Each limiting rod 41 is provided with a vertical clamping plate 42. The upper end of the clamping plate 42 is bent downward at a right angle to the side away from the driving column 32. A horizontal sliding slot 411 is defined on the outer wall of the limiting rod 41 and extends along the length of the limiting rod 41. The lower end of the clamping plate 42 is inserted into the sliding slot 411 and is slidably connected to the limiting rod 41. A limiting hole 11 is defined in the middle of the curved plate 1 to accommodate the limiting rod 41.

[0040] Both ends of the sliding groove 411 are connected to vertical clamping grooves 412. The bent end of the clamping plate 42, which is away from the driving column 32, is provided with an inclined surface that is inclined downward toward the side close to the driving column 32. The clamping plate 42 is clamped to the upper end of the arc plate 1 through the clamping groove 412. A connecting member 5 for connecting the clamping plate 42 is provided inside the limiting rod 41. The connecting member 5 includes a connecting ring 51 that is inserted into the limiting rod 41 and is slidably connected to the limiting rod 41. A vertical connecting plate 52 is fixedly connected to the upper side of the connecting ring 51. A connecting hole 413 that is adapted to the connecting plate 52 is opened on the upper side of the limiting rod 41. The upper end of the connecting plate 52 passes through the connecting hole 413 and is slidably connected to the limiting rod 41.

[0041] Reference Figure 2 and Figure 3 A horizontal connecting rod 53 is fixedly connected to the side of the clamping plate 42 near the connecting plate 52. A clip 54 is provided at the end of the connecting rod 53 away from the clamping plate 42. A vertical waist-shaped hole 521 is formed in the connecting plate 52. The connecting rod 53 passes through the waist-shaped hole 521 and is connected to the connecting plate 52 via the clip 54. A second lead screw 55 is inserted through the middle of the driving column 32 and rotatably connected thereto. The second lead screw 55 is inserted into the limiting rod 41 and threadedly connected to the connecting ring 51. A first motor 56, which is fixedly connected to the driving column 32, is mounted at the end of the second lead screw 55 away from the limiting rod 41. When the connecting plate 52 moves to the end of the connecting hole 413 away from the driving column 32, the distance between the curved plate 1 and the end of the limiting rod 41 away from the driving column 32 is equal to the thickness of the poured concrete.

[0042] The arc plate 1 is sleeved on the corresponding limit rod 41 and moved in the direction close to the clamping plate 42. The clamping plate 42 moves in the direction away from the column body 2 under the push of the arc plate 1. When the clamping plate 42 moves to the end of the sliding groove 411 away from the column body 2, the arc plate 1 is continuously pushed. The arc plate 1 contacts the inclined surface on the clamping plate 42 and the clamping plate 42 moves upward until the bent end of the clamping plate 42 is clamped on the upper end of the arc plate 1. The clamping plate 42 is continuously moved until the connecting rod 53 is inserted into the waist-shaped hole. 521 and is engaged with the connecting plate 52. At this time, the first motor 56 drives the second screw 55 to rotate, and the connecting ring 51 drives the curved plate 1 toward the direction close to the column body 2 until it moves to the distance between the inner wall of the curved plate 1 and the end of the limiting rod 41 is equal to the width of the poured concrete. At this time, the screw continues to rotate, and the connecting ring 51 abuts against the inner wall of the limiting rod 41 and pushes the limiting rod 41 to move toward the direction close to the column body 2 until it abuts against the column body 2. At this time, the curved plates 1 are spliced ​​with each other, which is convenient for pouring concrete.

[0043] Reference Figure 1 and Figure 3The clamping member 54 includes a clamping block 541 provided on one side of the connecting rod 53 away from the clamping plate 42. The connecting rod 53 is provided with a receiving groove 531. One end of the clamping block 541 is inserted into the receiving groove 531 and is slidably connected to the connecting rod 53. A spring 542 is provided in the receiving groove 531 with one end fixedly connected to the connecting rod 53. The other end of the spring 542 is fixedly connected to the clamping block 541. The side of the clamping block 541 away from the clamping plate 42 is provided with an inclined surface inclined toward the side close to the clamping plate 42. Figure 1 and Figure 3 The lower side of the end of the limiting rod 41 away from the driving column 32 is fixedly connected to the cylinder 6 with a telescopic rod facing the clamping plate 42, and the cylinder 6 is located directly below the clamping groove 412 of the end of the limiting rod 41 away from the driving column 32.

[0044] When the connecting rod 53 is connected to the connecting plate 52, the end of the connecting rod 53 passes through the waist-shaped hole 521. At this time, the side wall of the connecting plate 52 pushes the clamping block 541 into the receiving groove 531. At this time, the spring 542 is compressed. When the connecting rod 53 drives the receiving groove 531 to move to the side of the connecting plate 52 away from the clamping plate 42, the spring 542 pushes the side wall of the clamping block 541 to clamp on the side of the connecting plate 52 away from the clamping plate 42. At this time, the clamping block 541 and the side wall of the clamping plate 42 fix the connecting plate 52, making it easier for the connecting ring 51 to drive the clamping plate 42 to move until the arc plates 1 are spliced ​​together to form a sleeve. At this time, an accommodating cavity is formed between the inner side wall of the sleeve and the column body 2.

[0045] S2. Pour concrete into the accommodating cavity. After the concrete pouring is completed, the cylinder 6 pushes the clamping plate 42 to move upward and detach from the curved plate 1. At this time, the second screw 55 rotates and causes the connecting ring 51 to drive the clamping plate 42 to detach from the curved plate 1. The second screw 55 is continued to be rotated until the connecting ring 51 moves to the side of the connecting hole 413 close to the driving column 32. The second screw 55 is continued to be rotated. At this time, the connecting ring 51 pushes the limit rod 41 to detach from the curved plate 1, completing the repair of the column body 2.

[0046] The implementation principle of the sleeve sandwich concrete repair method of a severely damaged steel tube concrete column in an embodiment of the present application is as follows: the driving abutment plates 316 are all abutted against the upper end of the column body 2, the second motor 324 drives the driving column 32 to drive the clamping plate 42 to rotate in the direction away from each other, and the arc plate 1 is installed on the clamping plate 42 and the limit rod 41, the driving column 32 is driven to rotate until the clamping plates 42 are opposite, the clamping plates 42 drive the arc plates 1 to approach each other and plug in to form a sleeve, at this time, an accommodating cavity is formed between the inner wall of the sleeve and the outer wall of the column body 2, concrete is poured into the accommodating cavity, and when the concrete solidifies, the repair of the column body 2 is completed.

[0047] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for repairing severely damaged concrete-filled steel tube columns with interlayer concrete, characterized by: The following steps are involved: S1. Installing the sleeve: using a repair device to install two circular arc plates (1) spliced ​​together to form an annular shape on the outside of the damaged column body (2) to form a sleeve. At this time, a receiving cavity is formed between the inner diameter of the sleeve and the column body (2). The repair device includes a frame (3) and limit members (31) installed on both sides of the upper end of the frame (3). The lower side of the limit member (31) is provided with a clamping member (4) for clamping the arc plate (1). The clamping member (4) is slidably connected to both sides of the frame (3). Both sides of the frame (3) are provided with a second screw (55) for driving the clamping member (4) to move. One end of the second screw (55) is provided with a screw thread connected to the frame (3). The frame (3) is fixedly connected to the first motor (56), the clamping member (4) includes a limit rod (41) plugged into and slidably connected to one side of the frame (3), the arc plate (1) is provided with a limit hole (11) adapted to the limit rod (41), the upper side of the limit rod (41) is provided with a clamping plate (42), the upper end of the clamping plate (42) is bent downward in a direction close to the column body (2), the limit rod (41) is provided with a clamping groove (412) perpendicular to the length direction of the limit rod (41), and one bent end of the clamping plate (42) is clamped to the upper end of the arc plate (1) through the clamping groove (412); S2. Pour concrete into the accommodating cavity to complete the repair of the column body (2).

2. The method for repairing severely damaged concrete-filled steel tube columns according to claim 1, characterized in that: The limiting rod (41) is provided with a sliding groove (411) parallel to the length direction of the limiting rod (41), and the clamping plate (42) slides along the sliding groove (411). The clamping groove (412) is located at one end of the sliding groove (411), and the upper side of the other end of the sliding groove (411) is also connected to the clamping groove (412). The limiting rod (41) is provided with a connecting member (5) for driving the clamping plate (42) to move, and the bent end of the clamping plate (42) and the side close to the column body (2) are set as an inclined surface that is away from the column body (2) and inclined downward.

3. The method for repairing severely damaged concrete-filled steel tube columns according to claim 2, characterized in that: The connecting member (5) includes a connecting ring (51) inserted into the limiting rod (41) and sliding along the length direction of the limiting rod (41), one end of the second lead screw (55) is inserted into the limiting rod (41) and penetrates and is threadedly connected to the connecting ring (51), a connecting plate (52) is fixedly connected to the upper side of the connecting ring (51), and the ends of the connecting plates (52) away from each other pass through the limiting rod (41) and are slidably connected to the limiting rod (41), and the side of the clamping plate (42) away from the column body (2) is fixedly connected to a connecting rod (53), and the end of the connecting rod (53) away from the clamping plate (42) passes through the connecting plate (52) and is clamped to the connecting plate (52).

4. The method for repairing severely damaged concrete-filled steel tube columns according to claim 3, characterized in that: Both sides of the frame (3) are rotatably connected to drive columns (32), the limiting rods (41) are plugged into and slidably connected to the corresponding drive columns (32), and a second motor (324) for driving the drive columns (32) to rotate is provided on the frame (3).

5. The method for repairing severely damaged concrete-filled steel tube columns according to claim 1, characterized in that: The limiting member (31) includes a limiting ring (311) rotatably connected to one side of the upper end of the frame (3); a first screw (315) toward the column body (2) is inserted and threadedly connected to the middle of the limiting ring (311); the first screw (315) is slidably connected to the frame (3); and one end of the first screw (315) passing through the limiting ring (311) is in contact with the column body (2).

6. The method for repairing severely damaged concrete-filled steel tube columns according to claim 1, characterized in that: One of the arc-shaped plates (1) is fixedly connected to a plug-in block on both sides in the vertical direction, and the other arc-shaped plate (1) is provided with a plug-in slot adapted to the plug-in block on both sides. When the arc-shaped plates (1) are spliced ​​together, the plug-in block is plugged into the plug-in slot.

Images