Laminated slab supporting device

Abstract

The utility model discloses a laminated slab supporting device which comprises a supporting plate used for horizontally supporting a laminated slab and a plurality of lifting mechanisms arranged below the supporting plate at intervals and used for leveling the supporting plate. The lifting mechanism comprises a positioning rod used for making contact with the ground of a to-be-constructed position for positioning and a lifting rod arranged between the positioning rod and the supporting plate, one end of the lifting rod is detachably and fixedly connected with the supporting plate, the other end of the lifting rod is movably matched with the positioning rod and connected and fastened through a fastener, and the lifting rod is used for adjusting the distance between the supporting plate and the positioning rod; a synchronizing mechanism is arranged between every two adjacent lifting mechanisms, and the synchronizing mechanisms are fixedly connected with the lifting rods and used for synchronously adjusting the height of each lifting rod. According to the device, by controlling the synchronizing mechanism to keep horizontal, the height of each lifting mechanism can be synchronously and adaptively adjusted according to different heights of a construction site, so that the laminated slab can be quickly leveled, the operation is simple and quick, and the construction efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled building construction, in particular to a composite plate supporting device. Background Art

[0002] The floor slabs in prefabricated buildings are usually constructed using composite slabs, which are prefabricated concrete slabs that include a base plate and a steel cage fixed to the base plate. During construction, the lower part of the composite slab needs to be firmly supported so that concrete can be cast on the upper part of the composite slab. Therefore, the support system of the composite slab directly affects the safety and quality of prefabricated building construction.

[0003] In the prior art, a plurality of liftable support rods are usually arranged under the composite board, and the composite board is supported by the cooperation of the plurality of support rods so that the upper end of the composite board is kept horizontal. However, since the plurality of support rods are independent of each other, when leveling the composite board, the height and verticality of a single support rod are generally adjusted by eye or with the aid of a level. This operation depends on the experience of the construction personnel and has a large error. Once the verticality cannot be guaranteed, the composite board may be misaligned or tilted, which may lead to leakage and even affect the combination of the composite board and concrete, thus affecting the construction quality. In addition, for different heights, the plurality of support rods need to be adaptively adjusted one by one, which is difficult to adjust, slow, time-consuming and labor-intensive, and affects the construction efficiency. Utility Model Content

[0004] The utility model provides a composite plate supporting device to solve the technical problem that the composite plate supporting system in the prior art has complicated and difficult leveling operations for the composite plates.

[0005] According to one aspect of the utility model, a composite plate support device is provided, comprising a support plate for horizontally supporting the composite plate and a plurality of lifting mechanisms spaced apart below the support plate for leveling the support plate, the lifting mechanism comprising a positioning rod for contacting with the ground at a location to be constructed for positioning and a lifting rod arranged between the positioning rod and the support plate, one end of the lifting rod being detachably fixedly connected to the support plate, and the other end being movably matched with the positioning rod and fastened by a fastener, for adjusting the distance between the support plate and the positioning rod; a synchronization mechanism is arranged between two adjacent lifting mechanisms, the synchronization mechanism being fixedly connected to the lifting rod, for synchronously adjusting the height of each lifting rod.

[0006] Further, the synchronization mechanism includes a synchronization plate fixed on the lifting rod and a connecting rod for detachably connecting the synchronization plates on two adjacent lifting rods;

[0007] The distances between the synchronous plate and the supporting plate on each lifting rod are equal, and the connecting rod and the supporting plate are arranged in parallel.

[0008] Furthermore, a mounting groove is provided at the end of the connecting rod facing the synchronous plate, for inserting the synchronous plate;

[0009] The connecting rod and the synchronous plate are correspondingly provided with mounting holes penetrating the mounting grooves, which are used for bolts to pass through so that the bolts and nuts cooperate to fix the connecting rod and the synchronous plate.

[0010] Furthermore, the positioning rod is a hollow structure, and the lifting rod is axially movable and penetrates the positioning rod;

[0011] A threaded sleeve is fixedly installed radially at one end of the positioning rod close to the lifting rod. The threaded sleeve is communicated with the interior of the positioning rod and is used to cooperate with the fastener thread to fasten the positioning rod to the outer wall of the lifting rod.

[0012] Furthermore, a pad is fixedly mounted on one end of the positioning rod away from the lifting rod to support the positioning rod.

[0013] Furthermore, a limiting groove is provided on the outer wall of the lifting rod along the axial direction for accommodating the fastener and limiting it radially.

[0014] Furthermore, a first limiting member is provided at one end of the fastener facing the lifting rod, which is used to limit the fastener to prevent the fastener from escaping from the positioning rod and / or the threaded sleeve.

[0015] Furthermore, a second limiting member is provided on the lifting rod, which is used to axially limit the lifting rod to prevent the lifting rod from escaping from the interior of the positioning rod.

[0016] Furthermore, the fastener is a fastening bolt.

[0017] Furthermore, a non-slip and wear-resistant pad is fixedly bonded on the end surface of the support plate that is in contact with the composite plate.

[0018] The utility model has the following beneficial effects:

[0019] The utility model of the composite plate support device is provided with a lifting mechanism under the composite plate, and the lifting mechanism can adjust the height by controlling the axial activity of the lifting rod and the positioning rod, so that the lifting mechanism can adaptively adjust the distance between the ground and the composite plate at the construction site; the lifting mechanism is arranged at intervals under the support plate, and a synchronization mechanism is arranged between adjacent lifting mechanisms and the synchronization mechanism is fixedly connected to the lifting rod, so that by controlling the synchronization mechanism to keep it horizontal, it can be ensured that the support plate is kept horizontally lifted and lowered with the lifting mechanism, and then the positioning rod of each lifting mechanism is freely lifted and lowered by the activity cooperation with the lifting rod, so that each lifting mechanism can realize synchronous adaptive adjustment according to the different heights of the construction site, and the adjusted positioning rod is locked by a fastener to realize positioning on the construction ground, so that the upper ends of multiple lifting mechanisms are quickly adjusted to be flush, and the composite plate is quickly leveled, which saves time and effort, and the efficiency and accuracy of leveling are high. The use of the device to level the composite plate is simple and quick, greatly improves the construction efficiency, and ensures the construction quality of the composite plate; and the device is easy to install and disassemble, convenient for repeated turnover, and has a high utilization rate.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is a schematic elevation view of a composite board support device according to a preferred embodiment of the utility model;

[0023] Figure 2 yes Figure 1 A schematic diagram of the structure enlargement at the center A;

[0024] Figure 3 yes Figure 1 A magnified schematic diagram of the structure at point B in the middle.

[0025] Legend:

[0026] 100, support plate; 200, lifting mechanism; 201, positioning rod; 2011, threaded sleeve; 2012, fastener; 2013, pad; 202, lifting rod; 2021, limiting groove; 300, synchronization mechanism; 301, synchronization plate; 302, connecting rod. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0028] like Figure 1 , Figure 2 and Figure 3 As shown, the composite plate support device of this embodiment includes a support plate 100 for horizontally supporting the composite plate and a plurality of lifting mechanisms 200 for leveling the support plate 100. The plurality of lifting mechanisms 200 are arranged at intervals below the support plate 100. The lifting mechanism 200 includes a positioning rod 201 for contacting with the ground at the construction site for positioning and a lifting rod 202 arranged between the positioning rod 201 and the support plate 100. One end of the lifting rod 202 is detachably fixedly connected to the support plate 100, and the other end is movably matched with the positioning rod 201 and connected and fastened by a fastener 2012, so as to adjust the distance between the support plate 100 and the positioning rod 201. Preferably, the outer walls of the lifting rod 202 and the positioning rod 201 are both circular. A synchronization mechanism 300 is arranged between two adjacent lifting mechanisms 200. The synchronization mechanism 300 is fixedly connected to the lifting rod 202 and is used to synchronously adjust the height of each lifting rod 202. Preferably, a plurality of lifting mechanisms 200 are arranged at intervals along the same straight line below the support plate 100 , so as to facilitate the installation and removal of the synchronization mechanism 300 on the lifting mechanism 200 and improve the operation speed.

[0029] Specifically, in a construction site with an uneven ground, the initial heights of each lifting mechanism 200 are different, resulting in uneven end surfaces of the support plate 100 on the lifting mechanism 200. At this time, the synchronization mechanism 300 is connected between two adjacent lifting mechanisms 200 and fixed to the lifting rod 202. Since the synchronization mechanism 300 is at an equal distance from the upper end surface of each lifting mechanism 200, the upper end surfaces of multiple lifting mechanisms 200 can be adjusted to be horizontal during the installation of the synchronization mechanism 300, or after the synchronization mechanism 300 is installed, the synchronization mechanism 300 is supported by external force to keep the support plate 100 at the upper end of the lifting mechanism 200 horizontal, so that the support plate 100 in a horizontal state can be synchronously lifted and lowered with the lifting mechanism 200 through the synchronization mechanism 300. The lifting mechanism 200 is placed on the ground at the construction site, so that the positioning rod 201 stably supports the support plate 100, and then the lifting rod 202 and the positioning rod 201 are adjusted to a loose state, so that the lifting rod 202 and the positioning rod 201 can slide relative to each other along the axial direction, and then an external force is applied to the synchronization mechanism 300, so that the synchronization mechanism 300 and the support plate 100 remain horizontal and rise synchronously. During this process, the lifting rod 202 of each lifting mechanism 200 rises synchronously with the synchronization mechanism 300 until the support plate 100 is supported on the bottom of the composite plate and adjusted to the target position, so that each lifting mechanism 200 completes adaptive adjustment according to the different heights of the construction site. Alternatively, first, the synchronization mechanism 300 is lifted up by external force so that the support plate 100 rises synchronously with the synchronization mechanism 300 until it is supported at the target position at the bottom of the composite plate, and then the lifting rod 202 and the positioning rod 201 are adjusted to a loose state, so that the lifting rod 202 and the positioning rod 201 slide relative to each other in the axial direction. At this time, the positioning rod 201 of each lifting mechanism 200 moves toward the ground at the construction site and contacts the ground for synchronous lifting and adjustment, so that the lifting mechanism 200 can be adaptively adjusted according to the different heights of the construction site. After the height adjustment of each lifting mechanism 200 is completed, the lifting rod 202 and the positioning rod 201 are connected and fastened by the fastener 2012 for positioning, thereby completing the leveling of the composite plate, which is simple to operate, saves time and effort, and greatly improves the leveling efficiency of the composite plate. Preferably, at least two groups of the device can be set under the composite plate for simultaneous use to ensure the stability of the support of the composite plate and improve the accuracy of the leveling of the composite plate.

[0030] In this embodiment, a fixing plate is fixedly installed at one end of the lifting rod 202 away from the positioning rod 201, and the size of the fixing plate is larger than the outer diameter of the lifting rod 202, so as to increase the contact area with the bottom surface of the support plate 100, thereby realizing stable support for the support plate 100, and the support plate 100 is placed on the fixing plate and detachably fixedly connected with the fixing plate. Specifically, threaded holes are correspondingly provided on the support plate 100 and the fixing plate, and bolts are sequentially inserted into the threaded holes of the fixing plate and the support plate 100 to realize detachable fixed connection between the support plate 100 and the fixing plate. The support plate 100 and the fixed plate are arranged to be detachably fixedly connected. On the one hand, the support plate 100 can be firmly connected to the lifting rod 202 through the fixed plate, so as to avoid the support plate 100 from tilting or shaking, thereby causing the support plate 100 to support the composite plate unsteadily, affecting the horizontal adjustment of the composite plate; on the other hand, the fixed plate and the support plate 100 are detachably connected, so that the support plate 100 can be disassembled after use, which is convenient for storage and convenient for turnover and reuse, thereby improving the utilization rate. Optionally, the fixed plate and the support plate 100 can also be connected by clamping by setting mutually matching clamping grooves and protrusions, so that the support plate 100 can be directly clamped on the fixed plate to achieve connection with the lifting mechanism 200, greatly improving the installation efficiency of the support plate 100; optionally, the fixed plate and the support plate 100 can also be further tightened by bolts after being clamped, thereby improving the stability of the installation of the support plate 100. Optionally, a non-slip and wear-resistant pad is fixedly bonded on the end surface of the fixing plate facing the support plate 100 to increase the friction between the fixing plate and the support plate 100, improve the stability of the connection between the fixing plate and the support plate 100; at the same time, damage caused by mutual wear between the fixing plate and the support plate 100 is avoided, thereby improving the service life. Optionally, the support plate 100 can also be directly detachably fixedly connected or clamped to the end of the lifting rod 202. Optionally, the support plate 100 can be a steel beam or a wooden beam.

[0031] like Figure 1 and Figure 2As shown, the synchronization mechanism 300 includes a synchronization plate 301 and a connecting rod 302. The synchronization plate 301 is sleeved on the outside of the lifting rod 202 and fixedly connected to the lifting rod 202. The connecting rod 302 is arranged between two adjacent lifting mechanisms 200 and is used to be detachably fixedly connected with the synchronization plate 301 so that the synchronization plates 301 on each lifting mechanism 200 are connected to each other for synchronous control. Optionally, the synchronization plate 301 is welded and fixed to the lifting rod 202; optionally, the synchronization plate 301 is fixed to the lifting rod 202 by bolts. The distance between the synchronization plate 301 on each lifting rod 202 and the support plate 100 is equal, so that after each synchronization plate 301 is connected by the connecting rod 302, the upper end surface of each lifting rod 202 is ensured to remain in the same plane. The connecting rod 302 is arranged in parallel with the support plate 100, so that when an external force is applied to the synchronization mechanism 300, the support plate 100 can be synchronously lifted and lowered with the synchronization mechanism 300.

[0032] like Figure 1 and Figure 2 As shown, the end of the connecting rod 302 facing the synchronous plate 301 is provided with a mounting groove, and the synchronous plate 301 is embedded in the mounting groove for clamping and positioning; the connecting rod 302 and the synchronous plate 301 are provided with mounting holes that pass through the mounting groove. After the synchronous plate 301 is embedded in the mounting groove, the bolts are sequentially inserted into the mounting holes of the connecting plate and the synchronous plate 301, and then the nuts are tightened on the bolts, thereby completing the fixed connection between the synchronous plate 301 and the connecting rod 302. When the connecting rod 302 needs to be removed, the nuts and bolts can be screwed out. The connecting plate and the synchronous plate 301 are arranged in a detachable fixed connection mode, which can not only ensure the stability of the connection, but also facilitate disassembly for turnover and reuse, thereby improving the utilization rate. Preferably, the synchronous plate 301 is annularly structured and sleeved on the lifting rod 202, and a plurality of mounting holes are opened in the radial direction to facilitate alignment with the mounting holes on the connecting rod 302, thereby improving the connection speed of the connecting rod 302 and the synchronous plate 301.

[0033] like Figure 1 and Figure 3As shown, the positioning rod 201 is a hollow cylindrical structure, and the lifting rod 202 is axially movable and inserted into the positioning rod 201; a threaded sleeve 2011 is radially fixedly installed at one end of the positioning rod 201 close to the lifting rod 202, and the threaded sleeve 2011 is connected to the interior of the positioning rod 201, and the fastener 2012 is inserted into the threaded sleeve 2011 and threadedly connected to the threaded sleeve 2011 to fasten the positioning rod 201 to the outer wall of the lifting rod 202. Specifically, the lifting rod 202 can move freely in the axial direction in the positioning rod 201. When the positioning rod 201 and the lifting rod 202 need to be fixed, the fastener 2012 is screwed to extend into the positioning member to contact and tighten the outer wall of the lifting rod 202, thereby completing the fastening of the lifting rod 202; when the lifting rod 202 needs to be released so that the lifting rod 202 and the positioning rod 201 can slide relative to each other, the fastener 2012 is screwed in the opposite direction so that the fastener 2012 loses the abutment effect with the lifting rod 202. Preferably, a plurality of threaded sleeves 2011 are arranged along the radial direction of the positioning rod 201, and the number of fasteners 2012 matches the number of threaded sleeves 2011, so that the axial direction of the lifting rod 202 can be fastened by the fastener 2012, thereby strengthening the connection between the positioning rod 201 and the lifting rod 202 and greatly improving the stability.

[0034] like Figure 1 As shown, a pad 2013 is provided at one end of the positioning rod 201 away from the lifting rod 202, and the pad 2013 is fixedly mounted on the bottom of the synchronization plate 301 for contacting the ground to support the positioning rod 201. The size of the pad 2013 is larger than the outer diameter of the positioning rod 201 to increase the contact area with the ground and ensure the stability of the lifting mechanism 200 placed on the ground.

[0035] like Figure 1 and Figure 3 As shown, the outer wall of the lifting rod 202 is provided with a limiting groove 2021 along the axial direction, and the fastener 2012 is inserted into the interior of the positioning rod 201 through the threaded sleeve 2011 and extends into the limiting groove 2021 of the lifting rod 202. The width of the limiting groove 2021 is adapted to the fastener 2012, and is used to accommodate the fastener 2012 and radially limit the fastener 2012. In this embodiment, the lifting rod 202 is a cylindrical structure, so the contact surface between its outer wall and the fastener 2012 is small. By providing the limiting groove 2021 on the outer wall of the lifting rod 202, not only can the contact area between the fastener 2012 and the lifting rod 202 be increased to enhance the fastening effect, but also the fastener 2012 can be limited to prevent it from rotating along the radial direction of the lifting rod 202. Preferably, the number of the limiting grooves 2021 matches the number of the fasteners 2012, so that each fastener 2012 can be radially limited to prevent circumferential rotation.

[0036] Preferably, a first stopper is provided at one end of the fastener 2012 facing the lifting rod 202, which is used to limit the fastener 2012 to prevent the fastener 2012 from being disengaged from the threaded sleeve 2011. The first stopper is provided along the length direction of the positioning rod 201 and fixed to the end of the fastener 2012. When the fastener 2012 needs to be screwed in a direction away from the lifting rod 202, the fastener 2012 is prevented from being screwed out of the threaded sleeve 2011 to avoid the loss of parts. After the first stopper is installed, the maximum size of the end of the fastener 2012 facing the lifting rod 202 is not greater than the size of the stopper groove 2021 on the lifting rod 202, so as to avoid the fastener 2012 from being unable to extend into the stopper groove 2021 for fastening. Preferably, the first stopper is a protrusion provided at the end of the fastener 2012, or a stopper block provided along the radial direction of the fastener 2012.

[0037] Preferably, the lifting rod 202 is movably arranged inside the positioning rod 201 and can slide along the axial direction of the positioning rod 201. A second limit piece is provided on the lifting rod 202, and the second limit piece is arranged along the radial direction of the lifting rod 202. When the lifting rod 202 and the positioning rod 201 slide relative to each other, the second limit piece can cooperate with the fastener 2012 extending into the positioning rod 201 to limit the lifting rod 202 axially, so as to prevent the lifting rod 202 from escaping from the interior of the positioning rod 201.

[0038] Preferably, the fastener 2012 is a fastening bolt, which fastens and loosens the positioning rod 201 by threadedly cooperating with the threaded sleeve 2011. Specifically, when the positioning rod 201 needs to be fastened to the lifting rod 202, the fastening bolt is screwed from the outside to move it toward the inside of the positioning rod 201 and contact the outer wall of the lifting rod 202 in the positioning rod 201. When the fastening bolt abuts against the outer wall of the lifting rod 202, the fastening of the positioning rod 201 is completed; when the positioning rod 201 needs to be loosened so that the lifting rod 202 can be movably inserted into the positioning rod 201, the fastening bolt is screwed in the opposite direction to move it toward the direction away from the outer wall of the lifting rod 202 until the fastening force between the lifting rod 202 and the lifting rod 202 is lost, and the positioning rod 201 is loosened. Preferably, the number of the fastening bolts matches the number of the threaded sleeves 2011, and multiple fastening bolts are provided along the radial direction of the positioning rod 201 to improve the stability of the connection between the positioning rod 201 and the lifting rod 202. Optionally, a welding handle can be fixed on the fastening bolt, and a non-slip rubber sleeve is fixedly bonded to the outer surface of the handle so that workers can screw the fastening bolt through the handle, which is convenient for operation and effectively improves the adjustment speed and work efficiency.

[0039] Preferably, the end surface of the support plate 100 that contacts the laminated plate is fixedly bonded with an anti-skid and wear-resistant pad to increase the friction between the support plate 100 and the laminated plate, prevent the support plate 100 from tipping over or sliding due to insufficient friction, improve the stability of the support plate 100 supporting the laminated plate, and ensure the accuracy of leveling the laminated plate. At the same time, damage caused by mutual wear between the support plate 100 and the laminated plate is avoided, and the service life is increased. Optionally, the anti-skid and wear-resistant pad is a rubber pad.

[0040] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A composite plate support device, comprising a support plate (100) for horizontally supporting the composite plate and a plurality of lifting mechanisms (200) arranged at intervals below the support plate (100) for leveling the support plate (100), characterized in that: The lifting mechanism (200) comprises a positioning rod (201) for contacting with the ground at a construction site for positioning, and a lifting rod (202) arranged between the positioning rod (201) and the support plate (100), one end of the lifting rod (202) being detachably fixedly connected to the support plate (100), and the other end of the lifting rod (202) being movably matched with the positioning rod (201) and connected and fastened via a fastener (2012), so as to adjust the distance between the support plate (100) and the positioning rod (201); A synchronization mechanism (300) is provided between two adjacent lifting mechanisms (200), and the synchronization mechanism (300) is fixedly connected to two adjacent lifting rods (202) and is used to synchronously adjust the height of each lifting rod (202).

2. The composite plate support device according to claim 1, characterized in that: The synchronization mechanism (300) comprises a synchronization plate (301) fixed on the lifting rod (202) and a connecting rod (302) used for detachably connecting the synchronization plates (301) on two adjacent lifting rods (202); The distance between the synchronization plate (301) on each lifting rod (202) and the support plate (100) is equal, and the connecting rod (302) and the support plate (100) are arranged in parallel.

3. The composite plate supporting device according to claim 2, characterized in that: The end of the connecting rod (302) facing the synchronous plate (301) is provided with a mounting groove for inserting the synchronous plate (301); The connecting rod (302) and the synchronous plate (301) are correspondingly provided with mounting holes penetrating the mounting grooves, for allowing bolts to pass through so that the bolts cooperate with nuts to fix the connecting rod (302) and the synchronous plate (301).

4. The composite plate supporting device according to claim 1, characterized in that: The positioning rod (201) is of a hollow structure, and the lifting rod (202) is movably arranged in the positioning rod (201) along the axial direction; A threaded sleeve (2011) is fixedly mounted radially on one end of the positioning rod (201) close to the lifting rod (202); the threaded sleeve (2011) is connected to the interior of the positioning rod (201) and is used to threadably cooperate with the fastener (2012) to fasten the positioning rod (201) to the outer wall of the lifting rod (202).

5. The composite plate supporting device according to claim 4, characterized in that: A pad (2013) is fixedly mounted on one end of the positioning rod (201) away from the lifting rod (202) and is used to support the positioning rod (201).

6. The composite board support device according to claim 4, characterized in that: The outer wall of the lifting rod (202) is provided with a limiting groove (2021) along the axial direction, which is used to accommodate the fastener (2012) and limit it radially.

7. The composite plate supporting device according to claim 4, characterized in that: A first limiting member is provided at one end of the fastener (2012) facing the lifting rod (202), which is used to limit the fastener (2012) to prevent the fastener (2012) from being disengaged from the positioning rod (201) and / or the threaded sleeve (2011).

8. The composite plate supporting device according to claim 1, characterized in that: The lifting rod (202) is provided with a second limiting member for axially limiting the lifting rod (202) to prevent the lifting rod (202) from being separated from the positioning rod (201).

9. The composite plate supporting device according to claim 1, characterized in that: The fastener (2012) is a fastening bolt.

10. The composite plate supporting device according to claim 1, characterized in that: The support plate (100) is used to fix and bond an anti-skid and wear-resistant pad on the end surface in contact with the superimposed plate.

Images