Variable cross-section hollow pier ladder cage wall connecting member structure and method

Abstract

The application provides a variable cross-section hollow pier ladder cage wall connecting piece structure and method, and belongs to the technical field of bridge pier construction. The structure comprises a first rod body, the first rod body is used for being inserted into a prefabricated hole in the side wall of the hollow pier, the first rod body is provided with an insertion slot in the length direction, one end of a second rod body is inserted into the insertion slot of the first rod body, the other end of the second rod body extends out of the insertion slot of the first rod body, the second rod body is fixed to the first rod body through a plurality of threaded rods, and the end of the second rod body extending out of the insertion slot is provided with a clamping slot. A connecting block is fixedly connected to the bottom wall of the vertical rod of the ladder cage. Each group of clamping blocks is two in number and is rotatably connected to the two sides in the width direction of the clamping slot. Each group of clamping blocks is provided with an open state and a closed state. A limiting piece is used to keep each group of clamping blocks in the closed state. The application can stably and efficiently connect the ladder cage and the hollow pier, and improve the safety and quality of the variable cross-section hollow pier construction.

Description

Technical Field

[0001] This invention relates to the field of bridge pier construction technology, and more specifically, to a ladder cage wall-connecting structure and method for a variable cross-section hollow pier. Background Technology

[0002] In bridge engineering, variable cross-section hollow piers exhibit excellent performance in bearing heavy loads and resisting earthquakes due to their unique structural characteristics. To ensure the structural strength and stability of variable cross-section hollow piers, ladder cages are typically used during construction.

[0003] However, current technologies for supporting ladder cages often rely on temporary supports or tie rods, which have certain drawbacks. First, temporary supports have poor stability and are easily destabilized by external environmental factors, leading to safety hazards during construction. Second, tie rod connections are complex, and installation and dismantling are cumbersome, increasing construction difficulty and time. Furthermore, these traditional methods offer low operational safety during high-altitude work and struggle to ensure a tight fit between the ladder cage and the hollow pier, potentially affecting the pier's forming quality. Therefore, a more stable and efficient connection method is urgently needed to improve the safety and quality of variable cross-section hollow pier construction. Summary of the Invention

[0004] The purpose of this invention is to provide a ladder cage wall connection structure and method for a variable cross-section hollow pier, which can stably and efficiently connect the ladder cage and the hollow pier, and improve the safety and quality of the construction of the variable cross-section hollow pier.

[0005] Firstly, embodiments of the present invention are achieved through the following technical solutions:

[0006] A ladder cage wall-connecting structure for a variable cross-section hollow pier includes a first rod body, which is used to be inserted into a pre-made hole in the side wall of the hollow pier. The first rod body has an insertion groove along its length. A base plate is fixedly sleeved on the first rod body. The base plate is disposed against the side wall of the hollow pier. The four corners of the base plate are fixed to the side wall of the hollow pier by expansion bolts.

[0007] The second rod has one end inserted into the insertion slot of the first rod and the other end extending out of the insertion slot of the first rod. The second rod is fixed to the first rod by multiple screws threaded through it. The end of the second rod extending out of the insertion slot has a slot located on the top wall of the second rod.

[0008] A connecting block, which is fixedly connected to the bottom wall of the vertical rod of the ladder cage;

[0009] The card blocks are arranged in multiple groups, distributed along the length of the slot. Each group consists of two card blocks rotatably connected to both sides of the slot in the width direction. Each group of card blocks has an open state and a closed state.

[0010] When each set of the card blocks is in the rotated open state, the connecting block can be vertically moved into the card slot;

[0011] When each set of the locking blocks is in the rotated closed state, there is a gap between each set of the locking blocks. The gap between each set of the locking blocks and the projection of the locking groove of the second rod along its length form a T-shaped groove. The locking blocks are set to abut against the side wall of the vertical rod of the ladder cage.

[0012] A limiting member is connected to the second rod body, and the limiting member is used to keep each set of blocks in a closed state.

[0013] Furthermore, a positioning rod is provided on the inner bottom wall of the insertion groove of the first rod body. The length direction of the positioning rod is the same as the length direction of the insertion groove. A positioning groove is opened on the side wall of the second rod body opposite to the first rod body. The positioning rod and the positioning groove are inserted and matched with each other.

[0014] Furthermore, the positioning rod has a flared groove on the side facing the opening of the insertion groove, and a flared rod is fixedly installed in the positioning groove of the second rod body at the position opposite to the flared groove. The diameter of the opening of the positioning groove gradually increases towards the bottom wall of the positioning groove.

[0015] Furthermore, the spacing between the flared grooves gradually decreases towards their own bottom wall, and the bottom of the flared groove has the same shape as the flared rod. The diameter of the bottom shape of the flared groove is not greater than the diameter of the flared rod.

[0016] Furthermore, the limiting member includes a rod sleeve with an opening at one end facing the second rod body. The top wall of the rod sleeve has a clearance opening that communicates with the opening of the rod sleeve. The clearance opening is used to avoid the vertical rod of the ladder cage. The rod sleeve is used to slide on the second rod body and the locking block to restrict the rotation and opening of each set of locking blocks.

[0017] Furthermore, limiting spring pieces are fixedly provided on both side walls of the second rod body. The limiting spring pieces are provided with guide slopes on the side facing the insertion of the rod sleeve. The limiting spring pieces include an abutting part. A limiting opening is opened on the rod sleeve. The limiting opening and the limiting spring pieces are engaged in a snap-fit ​​relationship. At this time, the abutting part of the limiting spring pieces abuts against the limiting opening.

[0018] Furthermore, a reinforcing hook is hinged at the end of the clearance opening near the insertion of the second rod body. The hinge axis of the reinforcing hook is in the same direction as the length direction of the rod sleeve. The reinforcing hook is used to cross the clearance opening after rotation. The hook part of the reinforcing hook is hooked onto the side wall of the rod sleeve. The hook part of the reinforcing hook is fixedly provided with a limiting protrusion. The side wall of the rod sleeve is provided with a groove that cooperates with the limiting protrusion.

[0019] Furthermore, each set of the card blocks is provided with a rubber elastic rope, and the two ends of the multiple rubber elastic ropes are respectively connected to each set of the card blocks.

[0020] Furthermore, a locking plate is provided on the bottom wall of the slot of the second rod along the length direction. The two ends of the locking plate are arranged in a figure-eight shape and fixedly connected to the bottom wall of the slot. The middle part of the locking plate is arched, and the perimeter of its arched cross section is greater than half the circumference of a circle. The connecting block of the vertical rod of the ladder cage is provided with a bottom groove that is inserted and matched with the locking plate.

[0021] And / or, a locking tongue is fixedly provided on the four sides of the second rod body. The projection of the locking tongue along the length direction of the second rod body is 'T' shaped. A locking groove is provided on the first rod body opposite the locking tongue. The locking tongue and the locking groove are engaged with each other.

[0022] Secondly, embodiments of the present invention are achieved through the following technical solutions:

[0023] A method for using a ladder cage wall-connecting structure for a variable cross-section hollow pier, applicable to the ladder cage wall-connecting structure of the variable cross-section hollow pier described in the above scheme, includes the following steps:

[0024] S1: Fix the first rod in the pre-drilled hole on the side wall of the hollow pier and fix it with expansion bolts;

[0025] S2: Insert and fix the second rod into the insertion slot of the first rod, and fix it with a screw;

[0026] S3: Align the connecting block on the vertical rod of the ladder cage with the slot and insert it vertically;

[0027] S4: The two locking blocks corresponding to the vertical rod position of the rotating ladder cage are locked onto the vertical rod of the ladder cage, and the limiting parts are used to fix all the locking blocks in the closed state, thus realizing the wall connection installation of the ladder cage.

[0028] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0029] 1. This invention sets up a first rod body, inserts a second rod body into the insertion groove of the first rod body, uses expansion bolts to fix the base plate and the first rod body, and inserts the connecting block of the vertical rod of the ladder cage into the slot, and then uses a limiting component to fix the vertical rod of the ladder cage, thereby realizing the connection between the ladder cage and the hollow pier, and improving the safety and quality of the construction of the variable cross-section hollow pier.

[0030] 2. By setting up a rod sleeve, the present invention can fix the position of all the locking blocks, thereby fixing the connecting blocks of the vertical rods of the ladder cage. The fixing method is simple and reliable, and the position of the vertical rods of the ladder cage can be adjusted adaptively. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the overall structure of the ladder cage wall-connecting component of the variable cross-section hollow pier provided by the present invention;

[0033] Figure 2 This invention aims to illustrate the structural diagrams of the first rod, the second rod, the rod sleeve, and the vertical rod;

[0034] Figure 3 This invention aims to illustrate the structural diagram of the card block being rotated open and the reinforcing hook being rotated open;

[0035] Figure 4 This is a schematic diagram illustrating the structure of the rod sleeve.

[0036] Figure 5 This is a schematic diagram illustrating the structure of the card block in a rotated closed state, as intended by the present invention.

[0037] Figure 6 This is a schematic diagram illustrating the structure of the flared rod and the positioning rod of this invention;

[0038] Figure 7 For the present invention Figure 6 Enlarged view of section A;

[0039] Figure 8 This invention aims to show exploded views of the flared rod, the positioning rod, and the first rod body;

[0040] Icons: 1-Hollow pier, 2-First rod body, 21-Intercepting groove, 22-Base plate, 221-Expansion bolt, 222-Rib plate, 23-Positioning rod, 231-Flanged groove, 24-Locking groove, 3-Second rod body, 31-Card slot, 32-Card block, 321-T-shaped groove, 322-Arched notch, 33-Screw, 34-Positioning groove, 341-Flanged rod, 35-Limiting spring, 351-Guiding slope, 352-Abutting part, 36-Lock tongue, 4-Vertical rod, 41-Connecting block, 411-Bottom groove, 5-Limiting component, 51-Rod sleeve, 511-Allowing opening, 512-Groove, 52-Reinforcing hook, 521-Hook part, 522-Limiting protrusion, 53-Limiting opening, 6-Rubber elastic rope, 7-Locking piece. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] Example

[0044] The following description, in conjunction with specific embodiments, provides further details. Figures 1-8 As shown, the present invention is a ladder cage wall-connecting structure for a variable cross-section hollow pier, including a first rod 2, which is square in shape and is used to insert into a pre-made hole in the side wall of the hollow pier 1. The first rod 2 has a square insertion groove 21 along its length. A base plate 22 is welded onto the first rod 2, which is perpendicular to the first rod 2. A rib plate 222 is provided between the base plate 22 and the first rod 2. The rib plate 222 has a square cross-section. The base plate 22 is square and abuts against the side wall of the hollow pier 1. The four corners of the base plate 22 are fixed to the side wall of the hollow pier 1 by expansion bolts 221.

[0045] Reference Figure 2 and Figure 3As shown, one end of the second rod 3 is inserted into the insertion slot 21 of the first rod 2, and the other end extends out of the insertion slot 21 of the first rod 2. The second rod 3 is fixed to the first rod 2 by multiple screws 33 threaded through it. The end of the second rod 3 that extends out of the insertion slot 21 has a slot 31, which is located on the top wall of the second rod 3. The connecting block 41 is welded to the bottom wall of the vertical rod 4 of the ladder cage. The connecting block 41 is square and matches the slot 31.

[0046] It should be noted that multiple sets of locking blocks 32 are provided to accommodate the adjustment of the position of the connecting block 41 on the vertical rod 4 of the ladder cage. Multiple sets of locking blocks 32 are distributed along the length direction of the slot 31. Each set of locking blocks 32 consists of two blocks and is rotatably connected to both sides of the slot 31 in the width direction. Each set of locking blocks 32 is configured with an open state and a closed state. When each set of locking blocks 32 is in the rotatably open state, the connecting block 41 can be vertically moved into the slot 31. When each set of locking blocks 32 is in the rotatably closed state, there is a gap between each set of locking blocks 32. The gap between each set of locking blocks 32 and the projection of the slot 31 of the second rod body 3 along the length form a T-shaped groove 321, which can fix the connecting block 41. The arc-shaped notch 322 of the locking block 32 is set to abut against the side wall of the vertical rod 4 of the ladder cage to prevent the vertical rod 4 of the ladder cage from shaking.

[0047] Reference Figure 6 and Figure 7 As shown, in order to further fix and position the second rod 3, a positioning rod 23 is welded to the inner bottom wall of the insertion groove 21 of the first rod 2. The positioning rod 23 has a circular cross-section and the length direction of the positioning rod 23 is the same as the length direction of the insertion groove 21. A positioning groove 34 is opened on the side wall of the second rod 3 opposite to the first rod 2. The positioning rod 23 and the positioning groove 34 are inserted and matched with each other.

[0048] Reference Figure 6 As shown, the positioning rod 23 has a flared groove 231 on the side facing the opening of the insertion groove 21. A flared rod 341 is welded in the positioning groove 34 of the second rod body 3 at the position opposite to the flared groove 231. The diameter of the opening of the positioning groove 34 gradually increases towards the bottom wall of the positioning groove 34, and the distance between the flared grooves 231 and their own bottom wall gradually decreases. The bottom of the flared groove 231 has the same shape as the flared rod 341, and the diameter of the bottom shape of the flared groove 231 is not greater than the diameter of the flared rod 341.

[0049] Reference Figure 1 and Figure 2As shown, the limiting member 5 and the second rod body 3 are slidably sleeved together. The limiting member 5 is a rod sleeve 51, which is square in shape. The end of the rod sleeve 51 facing the second rod body 3 is open. The top wall of the rod sleeve 51 is provided with a clearance opening 511, which is connected to the opening of the rod sleeve 51. The clearance opening 511 is used to avoid the vertical rod 4 of the ladder cage. The rod sleeve 51 is used to slide on the second rod body 3 and the locking block 32 to restrict the rotation and opening of each set of locking blocks 32.

[0050] Reference Figure 4 and Figure 5 As shown, limit spring pieces 35 are welded to the two side walls of the second rod body 3. The limit spring piece 35 has a guide slope 351 on the side facing the insertion of the rod sleeve 51. The limit spring piece 35 includes an abutment part 352. A limit opening 53 is opened on the rod sleeve 51. The limit opening 53 and the limit spring piece 35 are engaged. At this time, the abutment part 352 of the limit spring piece 35 abuts against the limit opening 53.

[0051] Reference Figure 3 and Figure 4 As shown, a reinforcing hook 52 is hinged at the end of the clearance opening 511 of the rod sleeve 51 near the insertion of the second rod body 3. The hinge axis of the reinforcing hook 52 is in the same direction as the length direction of the rod sleeve 51. The reinforcing hook 52 is used to cross the clearance opening 511 after rotation. The hook part 521 of the reinforcing hook 52 hooks onto the side wall of the rod sleeve 51. A limiting protrusion 522 is welded to the hook part 521 of the reinforcing hook 52. The limiting protrusion 522 is semi-circular. A groove 512 that matches the limiting protrusion 522 is opened on the side wall of the rod sleeve 51.

[0052] Reference Figure 5 and Figure 6 As shown, each set of locking blocks 32 is provided with a rubber elastic rope 6. The two ends of the multiple rubber elastic ropes 6 are respectively connected to each set of locking blocks 32. The rubber elastic ropes 6 can play a role in resetting and at the same time restrict the position of the connecting block 41.

[0053] Reference Figure 2 and Figure 7 As shown, a locking piece 7 is provided on the bottom wall of the slot 31 of the second rod 3 along the length direction. The two ends of the locking piece 7 are arranged in a figure-eight shape and fixedly connected to the bottom wall of the slot 31. The middle part of the locking piece 7 is arched, and the perimeter of its arched cross section is greater than half the circumference of a circle. The connecting block 41 of the vertical rod 4 of the ladder cage is provided with a bottom groove 411 that is inserted and matched with the locking piece 7.

[0054] Reference Figure 2 and Figure 5As shown, a locking tongue 36 is fixedly provided on the four sides of the second rod 3. The projection of the locking tongue 36 along the length direction of the second rod 3 is 'T' shaped. A locking groove 24 is provided on the first rod 2 opposite to the locking tongue 36. The locking tongue 36 and the locking groove 24 are engaged with each other. The locking tongue 36 and the locking groove 24 can further fix the second rod 3.

[0055] Furthermore, embodiments of the present invention are implemented through the following technical solutions:

[0056] A method for using a ladder cage wall-connecting structure for a variable cross-section hollow pier, applicable to the ladder cage wall-connecting structure of the variable cross-section hollow pier in the above scheme, includes the following steps:

[0057] S1: The first rod 2 is fixedly installed in the pre-made hole on the side wall of the hollow pier 1 and fixed with expansion bolts 221;

[0058] S2: Insert the second rod 3 into the insertion slot 21 of the first rod 2 and fix it with screw 33;

[0059] S3: Align the connecting block 41 on the vertical rod 4 of the ladder cage with the slot 31 and insert it vertically;

[0060] S4: The two locking blocks 32 corresponding to the position of the vertical rod 4 of the rotating ladder cage are locked on the vertical rod 4 of the ladder cage, and the limiting part 5 is used to fix all the locking blocks 32 in the closed state, thus realizing the wall connection installation of the ladder cage.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A ladder cage wall ties structure for a variable cross-section hollow pier, characterized in that: include: The first rod (2) is used to be inserted into the pre-made hole in the side wall of the hollow pier (1). The first rod (2) has an insertion groove (21) along its length. A base plate (22) is fixedly sleeved on the first rod (2). The base plate (22) abuts against the side wall of the hollow pier (1). The four corners of the base plate (22) are fixed to the side wall of the hollow pier (1) by expansion bolts (221). The second rod (3) has one end inserted into the insertion slot (21) of the first rod (2) and the other end extending out of the insertion slot (21) of the first rod (2). The second rod (3) is fixed to the first rod (2) by multiple screws (33) threaded through it. The end of the second rod (3) extending out of the insertion slot (21) is provided with a slot (31), which is located on the top wall of the second rod (3). Connecting block (41), the connecting block (41) is fixedly connected to the bottom wall of the vertical rod (4) of the ladder cage; The card block (32) is provided in multiple sets, and the multiple sets of card blocks (32) are distributed along the length direction of the card slot (31). Each set of card blocks (32) consists of two card blocks (32) and is rotatably connected to both sides of the width direction of the card slot (31). Each set of card blocks (32) is configured with an open state and a closed state, wherein: When each set of the card blocks (32) is in the rotated open state, the connecting block (41) can be vertically moved into the card slot (31); When each set of the locking blocks (32) is in the rotating closed state, each set of the locking blocks (32) is spaced apart. The gap between each set of the locking blocks (32) and the projection of the slot (31) of the second rod (3) along the length form a T-shaped slot (321). The locking blocks (32) are abutted against the side wall of the vertical rod (4) of the ladder cage. Limiting member (5), the limiting member (5) is connected to the second rod body (3), the limiting member (5) is used to keep each set of blocks (32) in a closed state; The inner bottom wall of the insertion groove (21) of the first rod body (2) is provided with a positioning rod (23), the length direction of the positioning rod (23) is the same as the length direction of the insertion groove (21), and the second rod body (3) is provided with a positioning groove (34) on the side wall opposite to the first rod body (2), and the positioning rod (23) and the positioning groove (34) are inserted and matched with each other.

2. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 1, characterized in that: The positioning rod (23) has a flared groove (231) on the side facing the opening of the insertion groove (21). The positioning groove (34) of the second rod body (3) is fixedly provided with a flared rod (341) at the position directly opposite the flared groove (231). The diameter of the opening of the positioning groove (34) gradually increases towards the bottom wall of the positioning groove (34).

3. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 2, characterized in that: The spacing between the flared grooves (231) gradually decreases towards their own bottom wall. The bottom of the flared grooves (231) has the same shape as the flared rod (341). The diameter of the bottom shape of the flared grooves (231) is not greater than the diameter of the flared rod (341).

4. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 3, characterized in that: The limiting member (5) includes a rod sleeve (51), which has an opening at one end facing the second rod body (3). The top wall of the rod sleeve (51) has a clearance opening (511), which is connected to the opening of the rod sleeve (51). The clearance opening (511) is used to avoid the vertical rod (4) of the ladder cage. The rod sleeve (51) is used to slide on the second rod body (3) and the locking block (32) to restrict the rotation and opening of each set of locking blocks (32).

5. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 4, characterized in that: Limiting spring pieces (35) are fixedly provided on both sides of the second rod body (3). The limiting spring piece (35) has a guide slope (351) on the side facing the insertion of the rod sleeve (51). The limiting spring piece (35) includes an abutting part (352). A limiting opening (53) is opened on the rod sleeve (51). The limiting opening (53) and the limiting spring piece (35) are engaged. At this time, the abutting part (352) of the limiting spring piece (35) abuts against the limiting opening (53).

6. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 4, characterized in that: A reinforcing hook (52) is hinged at the end of the sleeve (51) near the insertion of the second rod (3). The hinge axis of the reinforcing hook (52) is in the same direction as the length direction of the sleeve (51). The reinforcing hook (52) is used to cross the clearance (511) after rotation. The hook part (521) of the reinforcing hook (52) is hooked onto the side wall of the sleeve (51). The hook part (521) of the reinforcing hook (52) is fixedly provided with a limiting protrusion (522). The side wall of the sleeve (51) is provided with a groove (512) that cooperates with the limiting protrusion (522).

7. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 4, characterized in that: Each set of the card blocks (32) is provided with a rubber elastic rope (6), and the two ends of the multiple rubber elastic ropes (6) are respectively connected to each set of the card blocks (32).

8. The ladder cage wall-connecting structure of the variable cross-section hollow pier according to claim 1, characterized in that: The bottom wall of the slot (31) of the second rod (3) is provided with a locking piece (7) along the length direction. The two ends of the locking piece (7) are arranged in a figure-eight shape and fixedly connected to the bottom wall of the slot (31). The middle part of the locking piece (7) is arched, and the perimeter of its arched section is greater than half the circumference of a circle. The connecting block (41) of the vertical rod (4) of the ladder cage is provided with a bottom groove (411) that is inserted and matched with the locking piece (7). And / or, a locking tongue (36) is fixedly provided on the four sides of the second rod (3). The projection of the locking tongue (36) along the length direction of the second rod (3) is 'T' shaped. A locking groove (24) is provided on the first rod (2) opposite to the locking tongue (36). The locking tongue (36) and the locking groove (24) are engaged with each other.

9. A method of using a ladder cage wall-connecting structure for a variable cross-section hollow pier, characterized in that: The ladder cage wall tie structure applicable to the variable cross-section hollow pier according to any one of claims 1-8 includes the following steps: S1: Fix the first rod (2) in the prefabricated hole on the side wall of the hollow pier (1) and fix it with expansion bolts (221); S2: Insert the second rod (3) into the insertion slot (21) of the first rod (2) and fix it with a screw (33); S3: Align the connecting block (41) on the vertical rod (4) of the ladder cage with the slot (31) and insert it vertically; S4: The two locking blocks (32) corresponding to the position of the vertical rod (4) of the rotating cage are locked on the vertical rod (4) of the cage, and the limiting piece (5) is used to fix all the locking blocks (32) in the closed state, so as to finally realize the wall connection installation of the cage.

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