Waterproof structure resistant to penetration of vegetation root thorns

Abstract

The utility model relates to a waterproof structure resistant to penetration of vegetation root thorns, and relates to the technical field of building waterproofing, the waterproof structure comprises a base layer composed of a roof body and a node part, and the node part comprises a parapet wall, a roof outlet pipeline and a downpipe opening; a rubber asphalt waterproof coating layer and a BAC root-puncture-resistant self-adhesion waterproof roll layer are sequentially arranged on the surface of the base layer in the direction away from the base layer, and an edge sealing assembly is arranged at the tail end of a node part of the BAC root-puncture-resistant self-adhesion waterproof roll layer. And the edge sealing assembly is used for abutting the edge of the tail end of the BAC root-puncture-resistant self-adhesive waterproof roll layer against the node part. The waterproof roll has the advantages that the edge warping phenomenon at the tail end of the node part of the roll is prevented, and the waterproof performance of a house after long-time use is further guaranteed.

Description

Technical Field

[0001] This application relates to the field of building waterproofing technology, and in particular to a waterproof structure resistant to root penetration by vegetation. Background Technology

[0002] Green roofs and basement roofs covered with soil offer advantages such as beautifying the environment, purifying the air, regulating temperature, reducing the heat island effect, and making full use of rainwater. However, they also place high demands on the waterproofing of roofs and basement roofs.

[0003] In related technologies, a common roof structure includes a base layer composed of the roof body and joints, with joints including parapet walls, roof-exit pipes, and downpipe outlets. Roof waterproofing typically involves laying waterproof membrane over the base layer. However, over time, the ends of the membrane at the joints often curl up and detach, allowing liquid to seep in and affecting the building's waterproofing performance. Therefore, improvements are needed. Utility Model Content

[0004] To prevent the ends of the roll material from curling up at the joints and to further ensure the waterproof performance of the house under long-term use, this application provides a waterproof structure resistant to root penetration by vegetation.

[0005] The waterproof structure resistant to root penetration provided in this application adopts the following technical solution:

[0006] A waterproof structure resistant to root penetration from vegetation includes a base layer consisting of a roof body and joint sections. The joint sections include a parapet wall, roof outlet pipes, and downpipe outlets. The surface of the base layer is sequentially provided with a rubber asphalt waterproof coating layer and a BAC root-penetration-resistant self-adhesive waterproof membrane layer in the direction away from the base layer. An edge-sealing component is provided at the end of the BAC root-penetration-resistant self-adhesive waterproof membrane layer at the joint section. The edge-sealing component is used to press the edge of the BAC root-penetration-resistant self-adhesive waterproof membrane layer tightly against the joint section.

[0007] By employing the above technical solutions, the BAC root-penetration-resistant self-adhesive waterproof membrane layer contains a chemical root inhibitor to suppress the continued extension of plant roots into the waterproof structure. The rubber asphalt waterproof coating layer is non-curing and creep-resistant, filling cracks in the substrate and forming a skin-like bond with the BAC root-penetration-resistant self-adhesive waterproof membrane layer, eliminating the risk of water seepage. This minimizes the risk of plant roots penetrating the roof's waterproof structure, ensuring the waterproofing capability of the roof substrate. Edge sealing components help prevent the BAC root-penetration-resistant self-adhesive waterproof membrane layer from detaching from the ends due to external factors, thereby improving the stability and reliability of the entire waterproof structure and further enhancing its overall waterproofing performance and durability.

[0008] Preferably, the roof body is provided with fiberglass mesh at the joints, the fiberglass mesh is located within the rubber asphalt waterproof coating layer, one side of the fiberglass mesh is attached to the side wall of the joint, and the other side of the fiberglass mesh is attached to the top wall of the roof body.

[0009] By adopting the above technical solution, in waterproof structures, the joints (such as parapet walls, roof pipes, and the junctions between downpipes and the roof structure) are stress concentration areas. During long-term use, due to factors such as temperature changes and structural settlement, cracks are prone to occur, thereby compromising the integrity of the waterproof structure. Fiberglass mesh is embedded in the rubber asphalt waterproof coating layer, forming a "coating-mesh-coating" sandwich structure. When the substrate experiences stress due to temperature deformation or structural settlement, the high tensile strength of the mesh helps to minimize cracking of the coating layer.

[0010] Preferably, the edge sealing assembly for the parapet wall includes a corrosion-resistant metal strip, which is connected to the parapet wall by bolts and abuts against the sidewall of the BAC root-penetration resistant self-adhesive waterproof membrane layer away from the parapet wall.

[0011] By adopting the above technical solution, the anti-corrosion metal strip is connected to the parapet wall with bolts, pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer tightly onto the side wall of the parapet wall, ensuring pressure on the end of the BAC root-penetration resistant self-adhesive waterproof membrane layer, and preventing the end of the membrane from shifting or falling off due to external factors.

[0012] Preferably, the sealing assembly for the roof-exit pipe includes a metal hoop, which is fitted over the roof-exit pipe and abuts against the side wall of the BAC root-penetration resistant self-adhesive waterproof membrane layer that extends outward from the roof-exit pipe.

[0013] By adopting the above technical solution, the metal hoop is set outside the roof pipe and presses the BAC root-penetration resistant self-adhesive waterproof membrane layer tightly onto the outer wall of the roof pipe. The clamping continuously applies pressure to the membrane layer without damaging the roof pipe, thereby preventing moisture from seeping through the gap between the BAC root-penetration resistant self-adhesive waterproof membrane layer and the roof pipe, and preventing the end of the membrane from shifting or falling off due to external factors.

[0014] Preferably, the sealing assembly for the downpipe outlet includes a clamping ring, which is elastically deformable, with one side of the clamping ring broken to form a fracture, and the clamping ring is disposed inside the downpipe outlet. The outer wall of the clamping ring presses the BAC root-penetration resistant self-adhesive waterproof membrane layer onto the inner wall of the downpipe outlet.

[0015] By adopting the above technical solution, the clamping ring, utilizing its own elastic deformation capability, can shrink and enter the downpipe opening. Combined with the elastic deformation recovery effect, it ensures that the outer wall of the clamping ring applies clamping force to the BAC root-penetration resistant self-adhesive waterproof membrane layer, thereby pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer firmly onto the inner wall of the downpipe opening. This not only improves the stability of the waterproof membrane layer at the downpipe opening but also minimizes the problem of membrane loosening caused by external vibration or water flow impact, enhancing the overall waterproofing effect.

[0016] Preferably, the sealing assembly for the drain pipe inlet further includes a first adjusting block, a second adjusting block, a connecting rod, a movable block, and a retracting member. The first adjusting block and the second adjusting block are symmetrically arranged along the axial direction of the clamping ring. Several movable blocks are provided, all of which are distributed circumferentially on the inner wall of the clamping ring and abut against the inner wall of the clamping ring. Two connecting rods are rotatably provided on each movable block, one of which is rotatably connected to the first adjusting block and the other is rotatably connected to the second adjusting block. The retracting member is used to drive the first adjusting block and the second adjusting block closer to each other and to fix the distance between the first adjusting block and the second adjusting block.

[0017] By adopting the above technical solution, the receiving component drives the first adjusting block and the second adjusting block to move closer to each other. When the first adjusting block and the second adjusting block move closer to each other, the included angle between the two connecting rods on each movable block decreases, the movable block moves away from the axis along the radial direction of the pressing ring, all movable blocks are distributed along the circumferential direction, and jointly support the inner wall of the pressing ring. At this time, the break of the pressing ring increases to adapt to the increase in diameter, so as to apply a pressing force to the BAC root-penetration resistant self-adhesive waterproof membrane layer, thereby pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer onto the inner wall of the drain pipe opening.

[0018] Preferably, the receiving component includes a screw and a nut. The screw is fixedly connected to the first adjusting block and extends toward the second adjusting block. The second adjusting block has a through hole for the screw to pass through. The nut is threadedly connected to the screw and abuts against the second adjusting block on the side away from the first adjusting block.

[0019] By adopting the above technical solution, rotating the nut causes it to move axially along the screw and approach the second adjusting block. The nut pushes the second adjusting block closer to the first adjusting block, thereby causing the movable block to move outward along the radial direction of the clamping ring. This increases the diameter of the clamping ring, pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer more tightly against the inner wall of the downpipe outlet. Simultaneously, the threaded connection between the nut and the screw has a self-locking characteristic, effectively fixing the first and second adjusting blocks after adjustment. This ensures the clamping ring maintains a stable clamping force on the waterproof membrane layer, guaranteeing the reliability and sealing of the waterproof structure at the downpipe outlet.

[0020] Preferably, a dovetail block is integrally formed on the inner wall of the clamping ring, and a dovetail groove is formed on the side wall of the movable block. The dovetail block and the dovetail groove are adapted to each other and slide together.

[0021] By adopting the above technical solution, the cooperation between the dovetail block and the dovetail groove enables a sliding connection between the clamping ring and the movable block, preventing the clamping ring from separating from the movable block during movement and causing the clamping ring to fall into the drain pipe.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By setting up a rubber asphalt waterproof coating layer, a BAC root-penetration resistant self-adhesive waterproof membrane layer, and edge sealing components, the waterproof structure of the roof is prevented from being penetrated by plant roots as much as possible, so as to ensure the waterproof ability of the roof base layer and help prevent the BAC root-penetration resistant self-adhesive waterproof membrane layer from falling off from the end due to external factors, thereby improving the stability and reliability of the entire waterproof structure and further enhancing the overall waterproof performance and durability of the waterproof structure.

[0024] 2. By setting up fiberglass mesh, the fiberglass mesh is embedded in the rubber asphalt waterproof coating layer, forming a sandwich structure of "coating-mesh-coating". When the base layer is stressed due to temperature deformation or structural settlement, the high tensile strength of the mesh helps to minimize the cracking of the coating layer.

[0025] 3. By setting a clamping ring, a first adjusting block, a second adjusting block, a connecting rod, a movable block, a screw, a nut, and a through hole, a clamping force is applied to the BAC root-penetration resistant self-adhesive waterproof membrane layer, thereby pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer onto the inner wall of the drain pipe opening. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a waterproof structure resistant to root penetration provided in the embodiments of this application.

[0027] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0028] Figure 3 This is a schematic diagram of the sealing assembly used for the drain pipe opening in the embodiments of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Base layer; 11. Roof body; 12. Node; 121. Parapet wall; 122. Roof pipe; 123. Downpipe outlet; 2. Rubber asphalt waterproof coating layer; 21. Fiberglass mesh; 3. BAC root-penetration resistant self-adhesive waterproof membrane layer; 4. Anti-corrosion metal strip; 5. Metal hoop; 6. Compression ring; 61. Dovetail block; 62. First adjusting block; 621. Screw; 631. Nut; 63. Second adjusting block; 64. Connecting rod; 65. Movable block; 651. Dovetail groove; 66. Break. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a waterproof structure resistant to root penetration from vegetation. (Refer to...) Figure 1 and Figure 2 The system comprises a base layer 1 consisting of a roof body 11 and joint parts 12. The joint parts 12 include a parapet wall 121, roof-exit pipes 122, and downpipe outlets 123. A rubber asphalt waterproof coating layer 2 and a BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 are sequentially applied to the surface of the base layer 1 in the direction away from the base layer 1. The rubber asphalt waterproof coating layer 2 is formed by brushing rubber asphalt waterproof coating onto the surface of the base layer 1. Due to the non-curing, self-healing, and creep-resistant characteristics of the rubber asphalt waterproof coating, even if the BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 contains water, it will not spread. The rubber asphalt waterproof coating layer 2 maintains its viscoelasticity and provides a lasting seal to the base layer 1 after construction, possessing both waterproofing and adhesive functions. The BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 contains a chemical root inhibitor to inhibit plant roots from extending further into the waterproof structure.

[0032] Reference Figure 1 The BAC root-penetration resistant self-adhesive waterproof membrane layer 3 has an edge sealing component at the end of the joint 12. The edge sealing component is used to press the edge of the end of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 tightly against the joint 12. The edge sealing component helps prevent the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 from falling off from the end due to external factors.

[0033] To minimize the risk of cracking in the rubber asphalt waterproof coating layer 2 at joint 12 due to stress concentration, refer to... Figure 1 and Figure 2A fiberglass mesh 21 is provided at the joint 12 of the roof body 11. The fiberglass mesh 21 is located within the rubber asphalt waterproof coating layer 2. One side of the fiberglass mesh 21 is attached to the side wall of the joint 12, and the other side is attached to the top wall of the roof body 11. When applying the rubber asphalt waterproof coating, first apply a layer of rubber asphalt waterproof coating to the junction of the roof body 11 and the joint 12, then lay the fiberglass mesh 21 on the rubber asphalt waterproof coating, and then apply another layer of rubber asphalt waterproof coating on the fiberglass mesh 21. Specifically, the width of one side of the fiberglass mesh 21 on the roof body 11 is not less than 250 mm, and the width of the other side of the fiberglass mesh 21 at the joint 12 is not less than 250 mm. Fiberglass mesh 21 is embedded in rubber asphalt waterproof coating layer 2 to form a sandwich structure of "coating-mesh-coating". When the base layer 1 is stressed due to temperature deformation or structural settlement, the mesh helps to avoid cracking of the coating layer through its high tensile strength.

[0034] To ensure a tight seal against the edge of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 at the end of the parapet wall 121, refer to... Figure 1 and Figure 2 The edge sealing assembly for the parapet wall 121 includes a corrosion-resistant metal strip 4, which is connected to the parapet wall 121 by bolts. The corrosion-resistant metal strip 4 abuts against the side wall of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 away from the parapet wall 121. The corrosion-resistant metal strip 4 is connected to the parapet wall 121 by bolts, pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 tightly against the side wall of the parapet wall 121, ensuring pressure on the end of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3.

[0035] To ensure a tight seal between the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 and the edge at the end of the roof pipe 122, refer to... Figure 1 The sealing assembly for the roof-exit pipe 122 includes a metal hoop 5 made of stainless steel. The metal hoop 5 is fitted over the roof-exit pipe 122 and abuts against the side wall of the BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 facing away from the roof-exit pipe 122. The metal hoop 5, fitted over the roof-exit pipe 122, applies continuous pressure to the membrane layer through its inward pressure when tightened, without damaging the roof-exit pipe 122, thus preventing moisture from seeping through the gap between the BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 and the roof-exit pipe 122.

[0036] To ensure a tight seal against the edge of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 on the inner wall of the drain pipe outlet 123, refer to... Figure 1 and Figure 3The sealing assembly for the downpipe inlet 123 includes a clamping ring 6, a first adjusting block 62, a second adjusting block 63, a connecting rod 64, a movable block 65, and a retractable part. The clamping ring 6 is made of stainless steel and is elastically deformable. One side of the clamping ring 6 is broken to form a fracture 66. The clamping ring 6 is located inside the downpipe inlet 123. The outer wall of the clamping ring 6 presses the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 tightly against the inner wall of the downpipe inlet 123. The first adjusting block 62 and the second adjusting block 63 are symmetrically arranged along the axial direction of the clamping ring 6.

[0037] Reference Figure 3 The movable blocks 65 are configured in several ways. In this embodiment, there are six movable blocks 65. All movable blocks 65 are evenly and spaced along the circumferential direction on the inner wall of the clamping ring 6 and abut against the inner wall of the clamping ring 6. Specifically, a dovetail block 61 is integrally formed on the inner wall of the clamping ring 6, and a dovetail groove 651 is formed on the side wall of the movable block 65. The dovetail block 61 and the dovetail groove 651 are adapted to each other and slide in fit. Two connecting rods 64 are rotatably provided on each movable block 65. One connecting rod 64 is rotatably connected to the first adjusting block 62, and the other connecting rod 64 is rotatably connected to the second adjusting block 63. The proximity member is used to drive the first adjusting block 62 and the second adjusting block 63 closer to each other and to fix the distance between the first adjusting block 62 and the second adjusting block 63.

[0038] Reference Figure 3 The receiving component includes a screw 621 and a nut 631. The screw 621 is fixedly connected to the first adjusting block 62 and extends towards the second adjusting block 63. The second adjusting block 63 has a through hole for the screw 621 to pass through. The nut 631 is threadedly connected to the screw 621. The nut 631 and the second adjusting block 63 abut against each other on the side away from the first adjusting block 62 by a washer.

[0039] Reference Figure 1 and Figure 3 By rotating the nut 631, the nut 631 moves axially along the screw 621 and approaches the second adjusting block 63. The nut 631 pushes the second adjusting block 63 closer to the first adjusting block 62, thereby causing the movable block 65 to move outward along the radial direction of the clamping ring 6, increasing the diameter of the clamping ring 6 and pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 more tightly onto the inner wall of the drain pipe outlet 123. At the same time, the threaded connection between the nut 631 and the screw 621 has a self-locking characteristic, which can fix the first adjusting block 62 and the second adjusting block 63 after the distance between them is adjusted, ensuring that the clamping ring 6 always maintains a stable clamping force on the waterproof membrane layer.

[0040] The implementation principle of the waterproof structure resistant to plant root penetration in this application embodiment is as follows: Due to the non-curing, self-healing, and creep characteristics of the rubber asphalt waterproof coating, even if water is present inside the BAC root-penetration resistant self-adhesive waterproof membrane layer 3, it will not spread. The rubber asphalt waterproof coating layer 2 maintains its viscoelasticity and provides a lasting seal to the substrate 1 after construction, possessing both waterproofing and adhesive functions. The BAC root-penetration resistant self-adhesive waterproof membrane layer 3 contains a chemical root inhibitor, which inhibits plant roots from continuing to extend into the waterproof structure.

[0041] The pre-prepared anti-corrosion metal strip 4 is placed along the end of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 on the parapet wall 121, and the parapet wall 121 is connected with bolts to fix the anti-corrosion metal strip 4. In this way, the end of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 on the parapet wall 121 is further constrained.

[0042] The metal clamp 5 is fitted over the outside of the roof-exit pipe 122, ensuring that it completely covers the end portion where the membrane layer meets the pipe. Then, by tightening the bolts on the metal clamp 5, an inward clamping force is applied, pressing the BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 firmly against the outer wall of the roof-exit pipe 122. This further restrains the end of the BAC root-penetration-resistant self-adhesive waterproof membrane layer 3 on the roof-exit pipe 122.

[0043] Cut the clamping ring 6 to a suitable length to change the size of the cut 66. Pass the dovetail groove 651 on the inner side of the clamping ring 6 through the dovetail groove 651 on the movable block 65. Place the clamping ring 6 into the drain outlet 123. By rotating the nut 631, the nut 631 moves axially along the screw 621 and approaches the second adjusting block 63. The nut 631 pushes the second adjusting block 63 closer to the first adjusting block 62, thereby causing the movable block 65 to move outward along the radial direction of the clamping ring 6, increasing the diameter of the clamping ring 6 and pressing the BAC root-penetration resistant self-adhesive waterproof membrane layer more tightly onto the inner wall of the drain outlet 123. Further constrain the ends of the BAC root-penetration resistant self-adhesive waterproof membrane layer 3 on the inner wall of the drain outlet 123.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waterproof structure resistant to root penetration by vegetation, characterized in that: The base layer (1) consists of a roof body (11) and a node (12). The node (12) includes a parapet wall (121), a roof pipe (122), and a downpipe (123). The surface of the base layer (1) is provided with a rubber asphalt waterproof coating layer (2) and a BAC root-penetration resistant self-adhesive waterproof membrane layer (3) in sequence in the direction away from the base layer (1). The end of the BAC root-penetration resistant self-adhesive waterproof membrane layer (3) on the node (12) is provided with an edge sealing component. The edge sealing component is used to press the edge of the end of the BAC root-penetration resistant self-adhesive waterproof membrane layer (3) against the node (12).

2. The waterproof structure resistant to root penetration by vegetation according to claim 1, characterized in that: The roof body (11) is provided with a fiberglass mesh (21) at the node (12). The fiberglass mesh (21) is located inside the rubber asphalt waterproof coating layer (2). One side of the fiberglass mesh (21) is attached to the side wall of the node (12), and the other side of the fiberglass mesh (21) is attached to the top wall of the roof body (11).

3. The waterproof structure resistant to root penetration by vegetation according to claim 1, characterized in that: The edge sealing assembly for the parapet wall (121) includes a corrosion-resistant metal strip (4), which is connected to the parapet wall (121) by bolts and abuts against the sidewall of the parapet wall (121) of the BAC root-penetration resistant self-adhesive waterproof membrane layer (3).

4. A waterproof structure resistant to root penetration by vegetation as described in claim 1, characterized in that: The sealing assembly for the roof-exit pipe (122) includes a metal hoop (5) which is fitted over the roof-exit pipe (122) and abuts against the side wall of the BAC root-penetration resistant self-adhesive waterproof membrane layer (3) that extends outward from the roof-exit pipe (122).

5. A waterproof structure resistant to root penetration by vegetation according to claim 1, characterized in that: The sealing assembly for the drain outlet (123) includes a clamping ring (6), which is elastically deformable. One side of the clamping ring (6) is broken to form a break (66). The clamping ring (6) is located inside the drain outlet (123). The outer wall of the clamping ring (6) presses the BAC root-penetration resistant self-adhesive waterproof membrane layer (3) onto the inner wall of the drain outlet (123).

6. A waterproof structure resistant to root penetration by vegetation as described in claim 5, characterized in that: The sealing assembly for the drain pipe inlet (123) further includes a first adjusting block (62), a second adjusting block (63), a connecting rod (64), a movable block (65), and a retracting member. The first adjusting block (62) and the second adjusting block (63) are symmetrically arranged in the axial direction of the clamping ring (6). There are several movable blocks (65), and all the movable blocks (65) are distributed along the circumferential direction on the inner wall of the clamping ring (6) and abut against the inner wall of the clamping ring (6). Two connecting rods (64) are rotatably arranged on each movable block (65), and one of the connecting rods (64) is rotatably connected to the first adjusting block (62), and the other connecting rod (64) is rotatably connected to the second adjusting block (63). The retracting member is used to drive the first adjusting block (62) and the second adjusting block (63) to move closer to each other and to fix the distance between the first adjusting block (62) and the second adjusting block (63).

7. A waterproof structure resistant to root penetration by vegetation as described in claim 6, characterized in that: The receiving component includes a screw (621) and a nut (631). The screw (621) is fixedly connected to the first adjusting block (62) and extends toward the second adjusting block (63). The second adjusting block (63) has a through hole for the screw (621) to pass through. The nut (631) is threadedly connected to the screw (621). The nut (631) and the second adjusting block (63) abut against each other on the side away from the first adjusting block (62).

8. A waterproof structure resistant to root penetration by vegetation as described in claim 6, characterized in that: The inner wall of the clamping ring (6) is integrally formed with a dovetail block (61), and the side wall of the movable block (65) is provided with a dovetail groove (651). The dovetail block (61) and the dovetail groove (651) are adapted to each other and slide together.

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