Hoop type wall connecting device and hoop type wall connecting system

Abstract

The utility model relates to the technical field of bridge construction, in particular to a hoop type wall connecting device and a hoop type wall connecting system. Connecting nodes are arranged between transverse rods of the elevator cage and vertical rods of the elevator cage. The extending pieces are connected to the hoop, one ends of the extending pieces extend out of the hoop, and the extending pieces are connected with the elevator cage; connecting pieces are connected to the at least two extending pieces, each connecting piece is connected with one connecting node, and the at least two connecting nodes are located at the same height of the same elevator cage. According to the hoop type wall connecting device, the ladder cage and the pier column can be connected under the condition that the structural integrity of the pier column is not damaged, and the hoop type wall connecting device has the advantages of being convenient to arrange and good in economical efficiency. Compared with a conventional connection mode, the connection stability can be improved, shaking of the elevator cage can be reduced, the elevator cage can achieve a better fixing effect, and the situation that the elevator cage completely loses constraint due to damage of a single component can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a hoop type wall connection device and a hoop type wall connection system. Background Art

[0002] In bridge construction, angle steel safety ladder cages are usually used as up and down pedestrian passages. To ensure the stability of the ladder cage, wall ties are required to connect it to the pier at a certain height to ensure the safety and stability of the ladder cage.

[0003] In the prior art, there are various connection forms of wall connecting parts. For example, a Chinese patent with a publication number of CN220284610U discloses a safety device for quickly connecting a cap beam ladder cage and a cylindrical bridge pier, including a fourth steel pipe transversely arranged on the inner side of the cap beam ladder cage upright, and two third steel pipes connected to the clamp and the fourth steel pipe to form a triangular structure with the fourth steel pipe.

[0004] In the above patent, one end of the two third steel pipes is connected to the fourth steel pipe, and the other end is connected to the same position of the clamp; the selection of the connection point is too arbitrary, which may lead to insufficient restraint on the ladder cage, making the ladder cage easy to shake relatively, which not only affects normal operation, but also poses a safety hazard. Utility Model Content

[0005] The utility model aims to overcome the problem in the background technology that the wall connection piece does not have sufficient restraint on the ladder cage, and provides a hoop type wall connection device and a hoop type wall connection system.

[0006] In a first aspect, the utility model provides a hoop-type wall connection device, comprising:

[0007] There is a connection node between the horizontal rod of the ladder cage and the vertical rod of the ladder cage;

[0008] At least two protruding pieces, the protruding pieces are connected to the hoop, one end of the protruding pieces protrudes outward from the hoop, and the protruding pieces are connected to the ladder cage;

[0009] At least two protruding members are connected with connecting members, each connecting member is connected to a connecting node, wherein at least two connecting nodes are at the same height on the same elevator cage.

[0010] The utility model provides a hoop-type wall connection device, which can connect the ladder cage with the pier column without destroying the structural integrity of the pier column by setting the hoop, thereby ensuring the stability and safety of the ladder cage. The hoop is convenient to set and economical. The protruding piece on it can facilitate the connection of the connecting piece and reduce the difficulty of installation.

[0011] The connection node structure strength and rigidity of the horizontal bar and the vertical bar on the ladder cage are relatively high. Connecting the connecting piece with the connection node is conducive to improving the connection stability and reducing the shaking of the ladder cage, so that the ladder cage can achieve a better fixing effect;

[0012] At least two connecting members are respectively connected to at least two connecting nodes at the same height on the same cage, which can form multi-point support for the cage at the same height, which is beneficial to maintaining the stability of the cage. Each connecting member is connected to a different protruding member, which can improve the reliability of the connection while reducing the difficulty of installation, and avoid damage to a single component causing the cage to completely lose its restraint.

[0013] Preferably, the protruding member is a protruding steel pipe, which protrudes outward along the radial direction of the clamp; the connecting member is a rod, and the central axis of the connecting member is horizontally arranged.

[0014] The protruding steel pipe on the clamp can be processed and manufactured in a processing plant. The protruding steel pipe is a hollow structure, which can reduce the deadweight of the structure. The central axis of the connecting piece is set horizontally, so that the connecting piece can provide a greater horizontal pulling force to prevent the ladder cage from tipping over due to being away from the clamp.

[0015] Preferably, it also includes an L-shaped angle steel, the L-shaped angle steel is connected to the connection node, and the connecting piece is overlapped on the L-shaped angle steel and fixedly connected thereto.

[0016] The L-shaped angle steel is easy to obtain and has good tensile and bending resistance. It can be welded to the ladder cage to simplify the installation process; overlapping the connecting piece on the L-shaped angle steel can reduce the installation difficulty when the connecting piece is fixed to the ladder cage.

[0017] Preferably, the connecting piece is a connecting steel pipe; the connecting steel pipe is connected to the extending steel pipe through a cross fastener; the connecting steel pipe is connected to the L-shaped angle steel through a cross fastener.

[0018] Preferably, it also includes a leveling piece, which is overlapped on the L-shaped angle steel and fixedly connected thereto, and the connecting piece is overlapped on the leveling piece and fixedly connected thereto.

[0019] The leveling piece has a leveling function and can make the center axis of the connecting piece horizontal by raising one end of the connecting piece close to the cage.

[0020] Preferably, the clamp includes two semicircular clamp pieces, both ends of which are provided with wing plates, and the two clamp pieces are connected by the wing plates; the length of the protruding piece extending out of the clamp surface is 20 to 40 cm; the thickness of the clamp is 1 to 1.5 mm.

[0021] Preferably, at least two spaced-apart protruding pieces are provided on a side of the hoop close to the cage, and two connecting pieces connected to the same cage are respectively connected to the two protruding pieces on the same hoop.

[0022] Preferably, two connecting pieces connected to the same elevator cage are respectively connected to protruding pieces on different clamps.

[0023] In a second aspect, the utility model provides a hoop-type wall connection system, comprising a ladder cage, a pier column and the hoop-type wall connection device as described above, wherein: the hoop embraces the pier column, and the ladder cage and the hoop are spaced apart.

[0024] The utility model provides a hoop-type wall connection system. By using the hoop-type wall connection device as described above, the ladder cage can be connected to the pier column without destroying the structural integrity of the pier column, thereby ensuring the stability and safety of the ladder cage, and has the advantages of convenient installation, good economy, high reliability and good fixing effect.

[0025] Preferably, the connecting piece is connected to a corner of the cage.

[0026] The corner structure of the cage has higher strength, which can further improve the stability of the connection; if the cage is twisted, the corner has the largest twisting amplitude, and connecting the connector to the corner can reduce the twisting amplitude by constraining the displacement of the connector, thereby better constraining the twisting of the cage and further improving the safety of the cage structure.

[0027] Preferably, at least two hoop-type wall connection devices are arranged at intervals along the vertical direction of the elevator cage.

[0028] A number of hoop-type wall connection devices arranged at intervals vertically can provide a stable support for the entire ladder cage.

[0029] Compared with the prior art, the utility model has the following beneficial effects:

[0030] 1. The utility model provides a clamp-type wall connecting device, which can connect the ladder cage to the pier column without destroying the structural integrity of the pier column by setting the clamp, thereby ensuring the stability and safety of the ladder cage. The clamp is easy to set up and has good economy. The outward extension piece is set on it to facilitate the connection of the connecting piece and reduce the difficulty of installation. The connection node structure strength and rigidity of the horizontal rod and the vertical rod on the ladder cage are high. Connecting the connecting piece with the connection node is beneficial to improving the connection stability and reducing the shaking of the ladder cage, so that the ladder cage can achieve a better fixing effect; at least two connecting pieces are respectively connected to at least two connection nodes at the same height on the same ladder cage, which can form multi-point support for the ladder cage at the same height, which is beneficial to maintaining the stability of the ladder cage. Each connecting piece is connected to different extension pieces, which can improve the reliability of the connection while reducing the difficulty of installation, and avoid damage to a single component causing the ladder cage to completely lose its constraint.

[0031] 2. The utility model provides a hoop-type wall connection system. By using the hoop-type wall connection device as described above, the ladder cage can be connected to the pier without destroying the structural integrity of the pier, thereby ensuring the stability and safety of the ladder cage, and has the advantages of easy installation, good economy, high reliability and good fixing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the hoop-type wall connection system described in this application;

[0033] Figure 2 This is a schematic diagram of the structure of the clamp described in this application;

[0034] Figure 3 This is a schematic diagram of the structure of the ladder cage described in this application;

[0035] Figure 4 This is a schematic top view of Example 2 of the present application.

[0036] Markings in the figure:

[0037] 1-Holding hoop;

[0038] 11- protruding piece; 12- hoop piece; 13- wing plate;

[0039] 2-Connectors;

[0040] 3- Ladder cage;

[0041] 31- horizontal bar; 32- vertical bar; 33- connection node;

[0042] 4-Pier. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0044] Unless otherwise specified, in the description of the specific embodiments of the present utility model, the expression terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / equipment / device of the utility model is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present utility model.

[0045] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.

[0046] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0047] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0048] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0049] Example 1

[0050] This embodiment provides a hoop type wall connection device, such as Figure 1-3 As shown, it includes: a connection node 33 between the horizontal bar 31 of the ladder cage 3 and the vertical bar 32 of the ladder cage 3; at least two protruding members 11, the protruding member 11 is connected to the hoop 1, and one end protrudes outward from the hoop 1, and the protruding member 11 is connected to the ladder cage 3; at least two protruding members 11 are connected to a connecting member 2, each connecting member 2 is connected to a connecting node 33, wherein at least two connecting nodes 33 are at the same height on the same ladder cage 3.

[0051] The hoop 1 is an annular structure, which can be fixedly connected to the pier 4 by embracing the pier 4; the protruding piece 11 is a protruding structure arranged on the hoop 1 and extending away from the center of the hoop 1. The protruding piece 11 can be a rod, a plate, etc., which can provide an attachment point for the connection of the connecting piece 2, thereby reducing the amount of high-altitude work during the setting of the wall connection piece.

[0052] The connecting member 2 is used to connect the ladder cage 3 and the hoop 1, so as to strengthen the connection between the ladder cage 3 and the hoop 1 and reduce the shaking amplitude and overturning probability of the ladder cage 3; under certain working conditions, the connecting node 33 can also be called the main node of the ladder cage 3, which is the intersection of the cross bar 31 and the vertical bar 32 that play the main load-bearing role; for example: for the square ladder cage 3, the top and bottom of each layer are respectively provided with cross bars 31 that play the main load-bearing role, and the four corners are provided with vertical bars 32 that play the main load-bearing role, so as to form a frame structure. At this time, the connecting node 33 is arranged at the corners of the square ladder cage along the vertical interval.

[0053] It can be understood that the connection node 33 between the horizontal bar 31 and the vertical bar 32 of the ladder cage 3 has a large rigidity. During the constraint process of the wall connection member, the deformation amplitude is small and the strength is high, which can effectively reduce the shaking of the ladder cage 3 and reduce the risk of structural damage to the ladder cage 3, which is beneficial to the safe use and structural safety of the ladder cage 3.

[0054] At the same height position of the same ladder cage 3, two or more connection nodes 33 are arranged, and these connection nodes 33 are respectively connected to different protruding members 11 by the same number of connecting members 2, so as to form multi-point constraints on the ladder cage 3, and further enhance the stability of the ladder cage 3; since each connecting member 2 is correspondingly connected to a connection node 33 and a protruding member 11, the harm of damage to a single component to the stability of the ladder cage 3 can be reduced, thereby enhancing the reliability of the connection.

[0055] The utility model provides a clamp type wall connection device, which can connect the ladder cage 3 with the pier 4 without destroying the structural integrity of the pier 4 by setting a clamp 1, thereby ensuring the stability and safety of the ladder cage 3. The clamp 1 is easy to set up and has good economy. The outward extension piece 11 provided thereon can facilitate the connection of the connecting piece 2 and reduce the difficulty of installation.

[0056] The connection node 33 between the horizontal rod 31 and the vertical rod 32 on the ladder cage 3 has high structural strength and rigidity. Connecting the connecting member 2 with the connection node 33 is beneficial to improving the connection stability and reducing the shaking of the ladder cage 3, so that the ladder cage 3 can achieve a better fixing effect.

[0057] At least two connecting members 2 are respectively connected to at least two connecting nodes 33 at the same height on the same ladder cage 3, which can form multi-point support for the ladder cage 3 at the same height, which is beneficial to maintaining the stability of the ladder cage 3. Each connecting member 2 is connected to a different protruding member 11, which can improve the reliability of the connection while reducing the difficulty of installation, and avoid damage to a single component causing the ladder cage 3 to completely lose its constraint.

[0058] In one or more preferred embodiments, the protruding member 11 is a protruding steel pipe, which protrudes outward along the radial direction of the clamp 1. The protruding steel pipe is easy to obtain and can be connected to the clamp 1 by welding, which is convenient to connect; the protruding steel pipe is a tubular hollow structure, which can reduce the deadweight of the structure, thereby reducing the load of the clamp 1; preferably, the protruding steel pipe and the clamp 1 are pre-processed in a processing plant; four protruding steel pipes are evenly distributed on the clamp 1 in an annular shape.

[0059] The connecting member 2 is a rod having a central axis. In the working state of the wall connection device, preferably, the central axis of the connecting member 2 is horizontally arranged; the horizontal connecting member 2 can provide a greater horizontal pulling force to constrain the ladder cage 3.

[0060] Preferably, an L-shaped angle steel is further included, the L-shaped angle steel is connected to the connection node 33, and the connecting member 2 is overlapped on the L-shaped angle steel and fixedly connected thereto.

[0061] The L-shaped angle steel is easy to obtain and has good tensile and bending resistance. It can be welded to the ladder cage 3 to simplify the installation process. During the installation of the wall connection device, the connecting piece 2 can be optionally overlapped on the L-shaped angle steel, thereby eliminating the need to lift the connecting piece 2 during the fixing process, thereby reducing the installation difficulty when the connecting piece 2 is fixed to the ladder cage 3.

[0062] Further preferably, the connecting piece 2 is a connecting steel pipe; the diameter of the connecting steel pipe can be 48 mm, and the wall thickness can be 3.5 mm.

[0063] Optionally, the connecting steel pipe and the extending steel pipe are connected via a cross fastener.

[0064] Optionally, the connecting steel pipe is connected to the L-shaped angle steel via a cross fastener.

[0065] Further preferably, the axis of the connecting steel pipe is parallel to the horizontal plane; and / or, four protruding pieces 11 are evenly distributed in a ring shape on the clamp 1.

[0066] In one or several preferred embodiments, a leveling piece is further included, which is overlapped on the L-shaped angle steel and fixedly connected thereto; and the connecting piece 2 is overlapped on the leveling piece and fixedly connected thereto.

[0067] In some cases, due to installation errors and other reasons, the connector 2 may not be set horizontally, or the connector 2 may be difficult to connect to the L-shaped angle steel, for example: when the clamp 1 is installed too high; at this time, a leveling piece can be set on the L-shaped angle steel to level the height difference. The size of the leveling piece can be selected according to the required leveling height. The leveling piece makes the central axis of the connector 2 horizontal by raising the end of the connector 2 close to the ladder cage 3; optionally, the connector 2 is a connecting steel pipe.

[0068] In one or several preferred embodiments, the clamp 1 includes two semicircular clamp pieces 12 , each clamp piece 12 is provided with wing plates 13 at both ends, and the two clamp pieces 12 are connected by the wing plates 13 .

[0069] The two hoop pieces 12 can embrace the pier column 4 together. During installation, the two hoop pieces 12 can be assembled in advance to align the wing plates 13 on the two hoop pieces 12, and then put on the designated position from top to bottom, and finally tighten the screws on the wing plates 13 manually. Preferably, a rubber pad can be pasted on the inner side of the hoop piece 12 to increase the connection strength between the hoop piece 12 and the pier column 4, and the rubber pad can be selected to be 0.6 mm.

[0070] Optionally, the thickness of the clamp 1 is 1-1.5 mm.

[0071] Optionally, the length of the protruding piece 11 extending out of the surface of the clamp 1 is 20 to 40 cm, and more preferably 30 cm.

[0072] Example 2

[0073] like Figure 4 As shown, this embodiment provides a clamp-type wall connection device. On the basis of Embodiment 1, at least two spaced-apart protruding pieces 11 are provided on the side of the clamp 1 close to the ladder cage 3, and the two connecting pieces 2 connected to the same ladder cage 3 are respectively connected to the two protruding pieces 11 on the same clamp 1.

[0074] This embodiment is applicable to the case where the cage 3 is connected to a single pier 4; the spaced-apart protruding pieces 11 refer to the connection points between the protruding pieces 11 and the hoop 1 being spaced apart.

[0075] In one or more preferred embodiments, the pier 4 is adjacent to one side of the cage 3, and the two connectors 2 are arranged in an "eight" shape, wherein: the spacing between the two connection nodes 33 is greater than the spacing between the two protruding members 11. In this arrangement, a slight shaking of the cage 3 can be fed back as a larger displacement of the connector 2, thereby improving the stability of the cage 3 by controlling the displacement amplitude of the connector 2.

[0076] Example 3

[0077] The present embodiment provides a clamp-type wall connection device, which is based on the embodiment 1 and is different from the embodiment 2 in that two connecting members 2 connected to the same ladder cage 3 are respectively connected to the protruding members 11 on different clamps 1.

[0078] This embodiment is applicable to the case where the ladder cage 3 is connected to a plurality of piers 4. For example, in a position where the piers 4 are densely distributed, the protruding piece 11 connected to the connecting piece 2 can be flexibly selected according to the relative positions of the protruding piece 11 on the hoop 1 and the ladder cage 3 to achieve a better connection effect.

[0079] Example 4

[0080] This embodiment provides a hoop-type wall connection system, such as Figure 1-3 As shown, it includes a ladder cage 3, a pier column 4 and a hoop-type wall connection device as described in Example 1, 2 or 3, wherein: the hoop 1 embraces the pier column 4, and the ladder cage 3 is spaced apart from the hoop 1.

[0081] The utility model provides a hoop-type wall connection system. By using the hoop-type wall connection device as described above, the ladder cage 3 can be connected to the pier 4 without destroying the structural integrity of the pier 4, thereby ensuring the stability and safety of the ladder cage 3, and has the advantages of convenient installation, good economy, high reliability and good fixing effect.

[0082] In one or more preferred embodiments, the connecting member 2 is connected to a corner of the cage 3 .

[0083] The corner structure of the cage 3 has higher strength, which can further improve the stability of the connection; if the cage 3 is twisted, the corner has the largest twisting amplitude, and connecting the connector 2 to the corner can reduce the twisting amplitude by constraining the displacement of the connector 2, thereby better constraining the twisting of the cage 3 and further improving the structural safety of the cage 3.

[0084] Optionally, the cross section of the cage 3 is rectangular.

[0085] In one or several preferred embodiments, at least two hoop-type wall connection devices are arranged at intervals along the vertical direction of the elevator cage 3 .

[0086] For a ladder cage 3 of a relatively high height, a plurality of hoop-type wall connection devices arranged at intervals vertically along the ladder cage 3 can provide a stable support for the entire ladder cage 3, thereby maintaining the overall structural safety of the ladder cage 3.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hoop-type wall connection device, characterized in that: include: A connection node (33) is provided between the horizontal rod (31) of the ladder cage (3) and the vertical rod (32) of the ladder cage (3); at least two protruding pieces (11), each of which is connected to the hoop (1) and has one end extending outward from the hoop (1), and each of which is connected to the cage (3); At least two protruding members (11) are connected to a connecting member (2), each of the connecting members (2) is connected to a connecting node (33), wherein at least two connecting nodes (33) are located at the same height on the same cage (3).

2. The hoop type wall connection device according to claim 1, characterized in that: The protruding member (11) is a protruding steel pipe, and the protruding steel pipe protrudes outward along the radial direction of the clamp (1); the connecting member (2) is a rod, and the central axis of the connecting member (2) is horizontal.

3. The hoop type wall connection device according to claim 2, characterized in that: It also comprises an L-shaped angle steel, the L-shaped angle steel is connected to the connection node (33), and the connection piece (2) is overlapped on the L-shaped angle steel and fixedly connected thereto.

4. The hoop type wall connection device according to claim 3, characterized in that: The connecting piece (2) is a connecting steel pipe; the connecting steel pipe is connected to the extending steel pipe via a cross fastener; the connecting steel pipe is connected to the L-shaped angle steel via a cross fastener.

5. The hoop type wall connection device according to claim 3, characterized in that: It also comprises a levelling piece, which is overlapped on the L-shaped angle steel and fixedly connected thereto, and the connecting piece (2) is overlapped on the levelling piece and fixedly connected thereto.

6. The hoop type wall connection device according to claim 1, characterized in that: The clamp (1) comprises two semicircular clamp pieces (12), two ends of the clamp pieces (12) are provided with wing plates (13), and the two clamp pieces (12) are connected by the wing plates (13); The length of the protruding piece (11) extending from the surface of the clamp (1) is 20 to 40 cm; and the thickness of the clamp (1) is 1 to 1.5 mm.

7. The clamp-type wall connection device according to any one of claims 1 to 6, characterized in that: At least two spaced-apart protruding pieces (11) are arranged on one side of the hoop (1) close to the ladder cage (3); and the two connecting pieces (2) connected to the same ladder cage (3) are respectively connected to the two protruding pieces (11) on the same hoop (1).

8. The clamp-type wall connection device according to any one of claims 1 to 6, characterized in that: The two connecting members (2) connected to the same ladder cage (3) are respectively connected to the protruding members (11) on different clamps (1).

9. A hoop-type wall connection system, characterized in that: It comprises a ladder cage (3), a pier column (4) and a hoop-type wall connection device as claimed in any one of claims 1 to 8, wherein: the hoop (1) embraces the pier column (4), and the ladder cage (3) is spaced from the hoop (1).

10. The hoop-type wall connection system according to claim 9, characterized in that: The connecting piece (2) is connected to a corner of the elevator cage (3); and / or, At least two of the hoop-type wall connection devices are arranged at intervals in the vertical direction along the ladder cage (3).

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