Vertical dry-type joint structure of prefabricated underground diaphragm wall

Abstract

The utility model relates to the technical field of prefabricated underground diaphragm walls, in particular to a vertical dry type connector structure of a prefabricated underground diaphragm wall, which comprises an upper butt joint wall body, a lower butt joint wall body, a butt joint guide unit, a plugging mechanism and a clamping mechanism, the butt joint guide unit is arranged at the top of the upper butt joint wall body; the butt joint guide unit comprises a pair of butt joint guide rods capable of being matched with a lower butt joint wall in an inserted mode, and the edges of the bottoms of the butt joint guide rods are rounded. The plugging mechanism is arranged at the top of the lower butt joint wall body; the plugging mechanism comprises two insertion cavities which can be in insertion fit with the butt joint guide rod and the butt joint block, and the inner diameters of the two insertion cavities are gradually reduced from top to bottom; the plugging mechanism further comprises a material placing block arranged on the lower butt joint wall body, and plugging glue and an extrusion block capable of extruding the plugging glue into the insertion cavity are arranged in the material placing block. According to the technical scheme, deviation correction in the butt joint process is achieved through the butt joint guide unit and the plugging mechanism.

Description

Technical Field

[0001] The utility model relates to the technical field of precast diaphragm walls, and particularly to a vertical dry joint structure for precast diaphragm walls. Background Technique

[0002] As an important part of modern underground engineering, the vertical dry joint structure of precast diaphragm walls plays a key role in connecting each precast wall unit and ensuring the overall structural stability and waterproof performance. However, there are still some obvious defects in the design and application of the vertical dry joint structure of precast diaphragm walls in the prior art.

[0003] On the one hand, it is often difficult to accurately align the traditional joint structure during the docking process, resulting in a large docking deviation, which not only affects the overall stability of the wall. To solve this problem, technicians have begun to explore the design of joint structures with guiding functions to provide precise guidance during the docking process, thereby reducing the docking deviation. However, these designs are often complex in structure, difficult to construct, and costly, and are difficult to be widely applied in actual projects.

[0004] On the other hand, the joint structures in the prior art still have deficiencies in waterproof performance. Since there are often gaps and voids at the joints, groundwater is likely to seep into the wall through these parts, seriously affecting the stability and service life of the underground structure. To improve the waterproof performance of the joints, technicians have taken various measures, such as adding waterproof layers and using high-performance sealing materials. However, these measures often require on-site construction, which not only increases the construction difficulty and cost, but also makes it difficult to ensure the consistency and reliability of the waterproof effect.

[0005] For the precast underground diaphragm wall vertical connection structure with embedded screw locks in the Chinese patent, through the provided lower precast diaphragm wall, upper precast diaphragm wall and screw lock device, the screw lock device includes an embedded lower screw lock component and an embedded upper screw lock component. The embedded upper screw lock component is embedded on the lower end face of the upper precast diaphragm wall. The embedded upper screw lock component includes a plugging rod, and a clamping joint is provided at the lower end of the plugging rod. The embedded lower screw lock component includes a lower fixing cylinder embedded on the upper end face of the lower precast diaphragm wall, a limiting cylinder fixedly arranged in the lower fixing cylinder, and a clamping ring and a lower spring arranged in the lower fixing cylinder. The inner hole of the limiting cylinder forms a limiting plugging hole for cooperating with the plugging rod, and the clamping ring clamps the clamping joint.

[0006] However, in actual use of the above structure, during the process of docking the upper docking wall and the lower docking wall, due to the lack of an effective guiding mechanism, it is difficult to ensure the docking accuracy. Such deviation will not only affect the overall stability of the wall, but may also have an adverse impact on subsequent construction and use, and it is not convenient to automatically seal the docking part. Summary of the Utility Model

[0007] In view of the above problems, a precast vertical dry joint structure for diaphragm walls is provided. Through the coordinated cooperation between the docking guiding unit and the sealing mechanism, the problems of easy deviation during wall docking and inconvenient sealing treatment after docking are solved.

[0008] To solve the problems of the existing technology, the utility model provides a precast vertical dry joint structure for diaphragm walls, which includes an upper docking wall and a lower docking wall. The dry joint structure further includes a docking guiding unit, a sealing mechanism and a clamping mechanism; the docking guiding unit is arranged at the top of the upper docking wall; the docking guiding unit includes a pair of docking guiding rods that can be inserted and matched with the lower docking wall, and the bottom edges of the pair of docking guiding rods are both rounded; the sealing mechanism is arranged at the top of the lower docking wall; the sealing mechanism includes two plugging chambers that can be inserted and matched with the docking guiding rods and docking blocks, and the inner diameters of the two plugging chambers gradually decrease from top to bottom; the sealing mechanism further includes a material placing block arranged on the lower docking wall, a sealing glue arranged in the material placing block and an extrusion block that can extrude the sealing glue into the plugging chamber; the clamping mechanism is arranged at the docking position between the upper docking wall and the lower docking wall and can clamp and connect the upper docking wall and the lower docking wall.

[0009] Preferably, the sealing mechanism further includes a setting plate, a sliding rod and a return spring; the setting plate is installed on the lower docking wall, and the setting plate is in a cuboid shape; the sliding rod is slidably installed on the setting plate, and the sliding rod is fixedly connected with the extrusion block; the return spring is installed on the sliding rod and is located above the setting plate, one end of the return spring is fixedly connected with the extrusion block, and the other end of the return spring is fixedly connected with the setting plate. When the docking guiding rod is inserted into the plugging chamber, the sliding rod is in a descending state and the return spring is in a compressed state, and can drive the extrusion block to extrude the sealing glue located in the material placing block, driving the sealing glue to flow.

[0010] Preferably, a flow chamber for the sealing glue to flow is provided on the setting plate, and a thin film is arranged on the flow chamber; a plugging chamber communicated with the flow chamber is arranged in the plugging chamber. When the sealing glue is extruded by the extrusion block, the extrusion force on the sealing glue can force the thin film to break, so that the sealing glue can flow into the plugging chamber through the flow chamber and the plugging chamber.

[0011] Preferably, the clamping mechanism includes a clamping block, a mounting plate, a sliding plate and a contact ball; the clamping block is arranged on the upper docking wall and is located above the lower docking wall; the mounting plate is arranged on the lower docking wall and on the side far away from the material placing block; the sliding plate is slidably arranged on the top of the mounting plate; the contact ball is arranged on the top of the sliding plate and is located above the mounting plate. When the upper docking plate descends, it can drive the clamping block to be inserted into the lower docking wall, and at the same time drive the contact ball to contact the clamping block and drive the sliding plate to be in a descending state.

[0012] Preferably, the clamping mechanism further includes a docking block, a telescopic spring, and a sliding block; two symmetrically arranged travel grooves are formed on the upper docking wall; the docking block is slidably arranged in the travel groove; the telescopic spring is arranged in the travel groove, one end of the telescopic spring is fixedly connected to the travel groove, and the other end of the telescopic spring is fixedly connected to the docking block; the sliding block is arranged on the docking block and can abut against the contact ball.

[0013] Preferably, the clamping mechanism further includes a clamping rod; two symmetrically arranged clamping grooves are formed on the contact ball, and the clamping grooves are cylindrical; the clamping rod is arranged on the sliding block, and when the clamping block is inserted into the lower docking wall, the clamping rod can be inserted into the clamping groove under the thrust of the docking block.

[0014] The beneficial effects of the present utility model compared with the prior art are as follows:

[0015] 1. By the collaborative cooperation between the docking guiding unit and the plugging mechanism, the present utility model realizes the deviation correction during the insertion of the docking guiding rod, improves the accuracy and stability of docking, solves the problem of weak deviation correction ability when the upper docking wall is docked with the lower docking wall in the prior art, and can effectively seal between the docking guiding rod and the insertion cavity.

[0016] 2. By providing a flow cavity and a plugging cavity, the present utility model realizes the effective sealing between the docking guiding rod and the insertion cavity, improves the waterproof effect of the insertion cavity and the docking guiding rod, and can extend the service life of the lower docking wall and the upper docking wall.

[0017] 3. By providing a clamping mechanism, the present utility model can drive the clamping rod to be inserted into the clamping groove formed on the contact ball. At this time, the clamping rod can clamp the clamping block on the contact ball, thereby realizing the effect of quickly clamping the upper docking wall on the lower docking wall. Description of the Drawings

[0018] Figure 1 It is a three-dimensional structure diagram from the first perspective of a precast vertical dry joint structure of an underground diaphragm wall of the present utility model.

[0019] Figure 2 It is a partial sectional structure diagram of the upper docking wall and the lower docking wall of a precast vertical dry joint structure of an underground diaphragm wall of the present utility model in the non-docked state.

[0020] Figure 3 It is Figure 2 The enlarged structure diagram at A in

[0021] Figure 4 It is a sectional structure diagram of the upper docking plate and the lower docking plate of a precast vertical dry joint structure of an underground diaphragm wall of the present utility model in the docked state.

[0022] Figure 5 is Figure 4 The enlarged structure diagram at position B in

[0023] Figure 6 is Figure 2 The enlarged structure diagram at position C in

[0024] The reference numerals in the figure are: 1, upper docking wall; 2, lower docking wall; 3, docking guiding unit; 31, docking guiding rod; 4, plugging mechanism; 41, plugging cavity; 42, material placing block; 43, plugging glue; 44, extrusion block; 45, setting plate; 46, sliding rod; 47, reset spring; 48, flowing cavity; 49, plugging cavity; 5, clamping mechanism; 51, clamping block; 52, mounting plate; 53, sliding plate; 54, contact ball; 55, docking block; 56, telescopic spring; 57, sliding block; 58, clamping rod. Specific embodiments

[0025] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0026] See Figures 1-3 As shown, a precast vertical dry joint structure for diaphragm walls includes an upper docking wall 1 and a lower docking wall 2. The dry joint structure further includes a docking guiding unit 3, a plugging mechanism 4 and a clamping mechanism 5; the docking guiding unit 3 is arranged at the top of the upper docking wall 1; the docking guiding unit 3 includes a pair of docking guiding rods 31 that can be inserted and matched with the lower docking wall 2, and the bottom edges of the pair of docking guiding rods 31 are all chamfered; the plugging mechanism 4 is arranged at the top of the lower docking wall 2; the plugging mechanism 4 includes two plugging cavities 41 that can be inserted and matched with the docking guiding rods 31 and the docking block 55, and the inner diameters of the two plugging cavities 41 gradually decrease from top to bottom; the plugging mechanism 4 further includes a material placing block 42 arranged on the lower docking wall 2, a plugging glue 43 arranged in the material placing block 42 and an extrusion block 44 that can extrude the plugging glue 43 into the plugging cavity 41; the clamping mechanism 5 is arranged at the docking position between the upper docking wall 1 and the lower docking wall 2 and can clamp and connect the upper docking wall 1 and the lower docking wall 2.

[0027] The plugging glue 43 is preferably a silicone sealant. The silicone sealant is in a semi-solidified state under normal conditions and has good sealing performance and plasticity. Pouring grooves for pouring concrete are provided on both the upper docking wall 1 and the lower docking wall 2. After the upper docking wall 1 and the lower docking wall 2 are docked, the concrete is poured onto the pouring grooves to further reinforce the connection stability between the upper docking wall 1 and the lower docking wall 2. When the upper docking wall 1 needs to be inserted onto the lower docking wall 2, first, the upper docking wall 1 is lifted by a hoisting tool and ensured to correspond to the position of the lower docking wall 2, and then the upper docking wall 1 is slowly lowered. During this process, a pair of docking guide rods 31 provided on the upper docking wall 1 will be docked with the insertion cavity 41 provided on the lower docking wall 2. Since the inner diameter of the insertion cavity 41 is designed to gradually decrease from top to bottom, a certain deviation is allowed when the docking guide rod 31 is inserted into the insertion cavity 41. As the docking guide rod 31 gradually descends, this deviation will gradually decrease under the guidance of the insertion cavity 41 until the docking guide rod 31 is completely inserted into the insertion cavity 41. And during docking, the extrusion block 44 can extrude the plugging glue 43 and make it flow into the insertion cavity 41 to seal the insertion cavity 41 and prevent groundwater from seeping in. The deviation correction during the insertion of the docking guide rod 31 is realized, the accuracy and stability of docking are improved, and the problem of weak deviation correction ability when the upper docking wall 1 and the lower docking wall 2 are docked in the prior art is solved.

[0028] See Figure 2 and Figure 3 As shown, the plugging mechanism 4 further includes a setting plate 45, a sliding rod 46 and a return spring 47; the setting plate 45 is installed on the lower docking wall 2, and the setting plate 45 is in a cuboid shape; the sliding rod 46 is slidably installed on the setting plate 45, and the sliding rod 46 is fixedly connected with the extrusion block 44; the return spring 47 is installed on the sliding rod 46 and is located above the setting plate 45. One end of the return spring 47 is fixedly connected with the extrusion block 44, and the other end of the return spring 47 is fixedly connected with the setting plate 45. When the docking guide rod 31 is inserted into the insertion cavity 41, the sliding rod 46 is in a descending state and the return spring 47 is in a compressed state, and can drive the extrusion block 44 to extrude the plugging glue 43 located in the material placing block 42, driving the plugging glue 43 to flow.

[0029] When the upper docking wall 1 is inserted into the lower docking wall 2, the upper docking wall 1 may first contact the sliding rod 46. When contacting, the sliding rod 46 moves downward along the setting plate 45 with clearance fit. A sliding space for the sliding rod 46 to descend is provided on the lower docking wall 2 to ensure that the sliding rod 46 can descend stably. When the sliding rod 46 moves downward, it can drive the extrusion block 44 to extrude the plugging glue 43 placed in the material placing block 42, forcing the plugging glue 43 to flow.

[0030] SeeFigure 2 and Figure 3 As shown, a flow chamber 48 for the sealing glue 43 to flow is opened on the setting plate 45, and a film is arranged on the flow chamber 48; a sealing chamber 49 connected with the flow chamber 48 is opened in the plug-in chamber 41, and when the sealing glue 43 is squeezed by the squeezing block 44, the squeezing force on the sealing glue 43 can force the film to rupture, so that the sealing glue 43 can flow into the plug-in chamber 41 through the flow chamber 48 and the sealing chamber 49.

[0031] When the sealing glue 43 is squeezed, it will force the film to rupture. After rupture, the film loses its protection against the sealing glue 43. At this time, the sealing glue 43 can flow into the plug-in chamber 41 through the flow chamber 48 and the sealing chamber 49, and inject and seal the docking guide rod 31 inserted into the plug-in chamber 41, thereby achieving effective sealing between the docking guide rod 31 and the plug-in chamber 41, improving the waterproof effect of the plug-in chamber 41 and the docking guide rod 31, and being able to extend the service life of the lower docking wall 2 and the upper docking wall 1.

[0032] See also Figures 4-6 As shown, the clamping mechanism 5 includes a clamping block 51, a mounting plate 52, a sliding plate 53 and a contact ball 54; the clamping block 51 is arranged on the upper docking wall 1 and is located above the lower docking wall 2; the mounting plate 52 is arranged on the lower docking wall 2 and is away from the side of the material placement block 42; the sliding plate 53 is slidably arranged on the top of the mounting plate 52; the contact ball 54 is arranged on the top of the sliding plate 53 and is located above the mounting plate 52. When the upper docking plate descends, it can drive the clamping block 51 to be inserted into the lower docking wall 2, and at the same time drive the contact ball 54 to contact the clamping block 51 and drive the sliding plate 53 to be in a descending state.

[0033] When the upper docking wall 1 is docked with the lower docking wall 2, the block 51 can be driven to move toward the lower docking wall 2. When the block 51 moves, it can contact the contact ball 54, which drives the sliding plate 53 to move downward along the mounting plate 52.

[0034] See also Figure 4 and Figure 5 As shown, the clamping mechanism 5 also includes a docking block 55, a telescopic spring 56 and a sliding block 57; two symmetrically arranged travel grooves are opened on the upper docking wall 1; the docking block 55 is slidably arranged in the travel groove; the telescopic spring 56 is arranged in the travel groove, one end of the telescopic spring 56 is fixedly connected to the travel groove, and the other end of the telescopic spring 56 is fixedly connected to the docking block 55; the sliding block 57 is arranged on the docking block 55 and can abut against the contact ball 54.

[0035] When the contact ball 54 and the sliding plate 53 move downward, the contact ball 54 can contact the sliding block 57. When contacting, the sliding block 57 and the docking block 55 are driven to slide in the travel groove. During this process, the telescopic spring 56 is driven to be compressed. When the latch 51 is completely inserted into the lower docking wall 2, the telescopic spring 56 is released, pushing the docking block 55 and the sliding block 57 in the direction of the contact ball 54 until the sliding block 57 abuts against the outside of the contact ball 54.

[0036] See Figure 5 and Figure 6 As shown, the latching mechanism 5 further includes a latch rod 58; two symmetrically arranged latching grooves are formed on the contact ball 54, and the latching grooves are cylindrical in shape; the latch rod 58 is arranged on the sliding block 57. When the latch 51 is inserted into the lower docking wall 2, the latch rod 58 can be inserted into the latching groove under the thrust of the docking block 55.

[0037] When the sliding plate 53 abuts against the outside of the contact ball 54, it can drive the latch rod 58 to be inserted into the latching groove formed on the contact ball 54. At this time, the latch rod 58 can latch the latch 51 on the contact ball 54, thereby achieving the effect of quickly latching the upper docking wall 1 on the lower docking wall 2.

[0038] Working principle: Slowly lower the upper docking wall 1. During this process, a pair of docking guide rods 31 provided on the upper docking wall 1 will be docked with the insertion cavity 41 opened on the lower docking wall 2. Since the inner diameter of the insertion cavity 41 is designed to gradually decrease from top to bottom, a certain deviation is allowed when the docking guide rod 31 is inserted into the insertion cavity 41. As the docking guide rod 31 gradually descends, this deviation will gradually decrease under the guidance of the insertion cavity 41 until the docking guide rod 31 is completely inserted into the insertion cavity 41. The deviation correction of the docking guide rod 31 during the insertion process is realized, improving the accuracy and stability of the docking, and solving the problem of weak deviation correction ability when the upper docking wall 1 and the lower docking wall 2 are docked in the prior art. First, it will contact the sliding rod 46. The sliding rod 46 moves downward along the setting plate 45 with clearance fit. During this process, the preset sliding space on the lower docking wall 2 ensures the stable descent of the sliding rod 46. As the sliding rod 46 moves, it will drive the extrusion block 44 to apply pressure to the sealing glue 43 in the material placing block 42, forcing the sealing glue 43 to flow. At this time, the sealing glue 43 will break through the occlusion of the film and flow into the insertion cavity 41 through the flow cavity 48 and the sealing cavity 49 to pour and seal the docking guide rod 31 inserted into the insertion cavity 41. This process ensures an effective seal between the docking guide rod 31 and the insertion cavity 41, significantly improving the waterproof performance of the insertion cavity 41 and the docking guide rod 31, thereby extending the service life of the lower docking wall 2 and the upper docking wall 1. In addition, during the docking process, the upper docking wall 1 will also drive the clamping block 51 to move towards the lower docking wall 2. When the clamping block 51 contacts the contact ball 54, it will drive the contact ball 54 to drive the sliding plate 53 to move downward along the mounting plate 52. At the same time, the downward movement of the contact ball 54 and the sliding plate 53 will contact the sliding block 57, thereby driving the sliding block 57 and the docking block 55 to slide in the stroke groove and compress the telescopic spring 56. When the clamping block 51 is completely inserted into the lower docking wall 2, the telescopic spring 56 releases energy and pushes the docking block 55 and the sliding block 57 towards the contact ball 54 until the sliding block 57 abuts against the outside of the contact ball 54. At this time, the sliding plate 53 will also abut against the outside of the contact ball 54 and drive the clamping rod 58 to insert into the clamping groove opened on the contact ball 54, realizing the clamping of the clamping block 51 and the contact ball 54, so as to quickly clamp the upper docking wall 1 on the lower docking wall 2.

[0039] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A precast vertical dry joint structure for diaphragm walls, comprising an upper butt-jointed wall (1) and a lower butt-jointed wall (2), characterized in that, The dry joint structure further includes a docking guiding unit (3), a plugging mechanism (4), and a clamping mechanism (5); The docking guiding unit (3) is arranged at the top of the upper docking wall body (1); the docking guiding unit (3) includes a pair of docking guiding rods (31) capable of being inserted and fitted with the lower docking wall body (2), and the bottom edges of the docking guiding rods (31) are all rounded; The plugging mechanism (4) is arranged at the top of the lower docking wall body (2); the plugging mechanism (4) includes two plugging chambers (41) capable of being inserted and fitted with the docking guiding rods (31) and the docking blocks (55), and the inner diameters of the two plugging chambers (41) gradually decrease from top to bottom; The plugging mechanism (4) further includes a material placing block (42) arranged on the lower docking wall body (2), a plugging glue (43) is arranged in the material placing block (42), and an extrusion block (44) capable of extruding the plugging glue (43) into the plugging chamber (41); Wherein, when the docking guiding rod (31) is inserted into the plugging chamber (41), the extrusion block (44) is in a descending state and extrudes the plugging glue (43) in the material placing block (42) into the plugging chamber (41); The clamping mechanism (5) is arranged at the docking part between the upper docking wall body (1) and the lower docking wall body (2) and can clamp and connect the upper docking wall body (1) and the lower docking wall body (2).

2. The vertical dry joint structure of a precast diaphragm wall according to claim 1, characterized in that, The plugging mechanism (4) further includes a setting plate (45), a sliding rod (46), and a return spring (47); the setting plate (45) is installed on the lower docking wall body (2), and the setting plate (45) is in a cuboid shape; the sliding rod (46) is slidably installed on the setting plate (45), and the sliding rod (46) is fixedly connected with the extrusion block (44); the return spring (47) is installed on the sliding rod (46) and is located above the setting plate (45), one end of the return spring (47) is fixedly connected with the extrusion block (44), and the other end of the return spring (47) is fixedly connected with the setting plate (45). When the docking guiding rod (31) is inserted into the plugging chamber (41), the sliding rod (46) is in a descending state and the return spring (47) is in a compressed state, and can drive the extrusion block (44) to extrude the plugging glue (43) located in the material placing block (42), driving the plugging glue (43) to flow.

3. The vertical dry joint structure of a precast diaphragm wall according to claim 2, characterized in that, A flow chamber (48) for the plugging glue (43) to flow is formed on the setting plate (45), and a thin film is arranged on the flow chamber (48); a plugging chamber (49) communicated with the flow chamber (48) is formed in the plugging chamber (41). When the plugging glue (43) is extruded by the extrusion block (44), the extrusion force on the plugging glue (43) can force the thin film to break, so that the plugging glue (43) can flow into the plugging chamber (41) through the flow chamber (48) and the plugging chamber (49).

4. A precast vertical dry joint structure for diaphragm walls according to claim 1, characterized in that, The clamping mechanism (5) includes a clamping block (51), a mounting plate (52), a sliding plate (53) and a contact ball (54); the clamping block (51) is arranged on the upper docking wall body (1) and above the lower docking wall body (2); the mounting plate (52) is arranged on the lower docking wall body (2) and on the side far away from the material placing block (42); the sliding plate (53) is slidably arranged on the top of the mounting plate (52); the contact ball (54) is arranged on the top of the sliding plate (53) and above the mounting plate (52). When the upper docking plate descends, it can drive the clamping block (51) to insert into the lower docking wall body (2), and at the same time drive the contact ball (54) to contact the clamping block (51) and drive the sliding plate (53) to be in a descending state.

5. A precast vertical dry joint structure for diaphragm walls according to claim 4, characterized in that, The clamping mechanism (5) further includes a docking block (55), a telescopic spring (56) and a sliding block (57); two symmetrically arranged travel grooves are formed on the upper docking wall body (1); the docking block (55) is slidably arranged in the travel grooves; the telescopic spring (56) is arranged in the travel grooves, one end of the telescopic spring (56) is fixedly connected to the travel grooves, and the other end of the telescopic spring (56) is fixedly connected to the docking block (55); the sliding block (57) is arranged on the docking block (55) and can abut against the contact ball (54).

6. The vertical dry joint structure of a precast diaphragm wall according to claim 5, characterized in that, The clamping mechanism (5) further includes a clamping rod (58); two symmetrically arranged clamping grooves are formed on the contact ball (54), and the clamping grooves are cylindrical; the clamping rod (58) is arranged on the sliding block (57). When the clamping block (51) inserts into the lower docking wall body (2), the clamping rod (58) can be inserted into the clamping grooves under the thrust of the docking block (55).

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