A waterproof structure for roof deformation joints

Abstract

The present invention discloses a waterproof structure for a roof deformation joint, belonging to the technical field of construction engineering. It includes a left retaining wall and a right retaining wall arranged on both sides of the expansion joint in the length direction. The upper end of the left retaining wall is provided with a horizontal cover plate integrally cast with it. The projection of the horizontal cover plate in the vertical direction completely covers the projection of the right retaining wall in the vertical direction. A vertically arranged installation through groove is provided in the length direction of the horizontal cover plate. An installation plate fixedly connected thereto is provided above the installation through groove. A plurality of threaded holes are provided in the length direction of the installation plate. Threaded rods respectively matching and connected thereto are arranged in the threaded holes. A sealing block is provided at one end of the threaded rod facing the right retaining wall. The sealing block is slidably connected in the installation through groove and one end is connected to the end of the threaded rod. This technical solution is used to solve the problem that the waterproof mechanism of the roof expansion joint in the prior art is difficult to adapt to the settlement deformation of building units, resulting in poor waterproof effect on the expansion joint.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and particularly relates to a waterproof structure for roof deformation joints. Background Art

[0002] As Figure 11 shown, in the prior art, the waterproof structure of roof deformation joints usually adopts precast concrete covers. The disadvantages of using precast concrete covers are as follows: If uneven settlement or deformation occurs in the unit structures on both sides of the deformation joint, it is easy to cause gaps between the precast concrete covers; in addition, the precast concrete covers are installed by laying mortar, and the mortar is laid on the waterproof layer. Due to being stepped on or shaken by earthquakes, it is easy to be disturbed, thus reducing the waterproof performance.

[0003] Again, as shown in the roof waterproof expansion joint structure with the application number CN202221730620.7, it includes a wall body. There is an expansion joint between the two groups of wall bodies. Symmetrically fixed supports are provided on both sides of the inner cavity of the expansion joint. A fixing component is fixed on the top of the support. The top of the support is fixedly connected with a water receiving groove through the fixing component, etc., which can achieve the waterproof effect of the expansion joint. However, when the above structure is actually applied, if settlement occurs on one side of the building, it will cause the cover plate to tilt, resulting in the problem that rainwater enters from the tilted part. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a waterproof structure for roof deformation joints to solve the problem that the waterproof mechanism of the roof expansion joint in the prior art is difficult to adapt to the settlement and deformation of building units, resulting in poor waterproof effect on the expansion joint.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A waterproof structure for roof deformation joints of the present invention includes a left retaining wall and a right retaining wall arranged on both sides in the length direction of the expansion joint. A horizontal cover plate integrally cast with the left retaining wall is provided at the upper end of the left retaining wall. The projection of the horizontal cover plate in the vertical direction completely covers the projection of the right retaining wall in the vertical direction. An installation through groove vertically arranged is provided in the length direction of the horizontal cover plate. An installation plate fixedly connected thereto is provided above the installation through groove. A plurality of threaded holes are provided in the length direction of the installation plate. Threaded rods matched and connected thereto are provided in the threaded holes. A sealing block is provided at one end of the threaded rod facing the right retaining wall. The sealing block is slidably connected in the installation through groove, and one end is connected to the end of the threaded rod, and the other end is in close contact with the upper end surface of the right retaining wall. A sealing strip is provided above the end of the threaded rod away from the right retaining wall. The upper surface of the sealing strip is flush with the upper surface of the horizontal cover plate.

[0007] The waterproof principle of this technical solution is as follows:

[0008] The height of one side retaining wall is relatively high, and a horizontal cover plate is provided at the upper end of the higher retaining wall (left retaining wall). The horizontal cover plate covers the expansion joint, which can achieve the effect of self-waterproofing. At the same time, by rotating the threaded rod, the sealing block can be pushed downward to make it closely contact with the upper surface of the lower retaining wall (right retaining wall), which can seal the spacing gap between the horizontal cover plate and the upper surface of the lower retaining wall, further preventing rainwater from entering the expansion joint through the spacing between the two. At the same time, it should be noted that the purpose of setting a gap between the horizontal cover plate and the lower retaining wall is to adapt to the settlement of the building and avoid the problem that when settlement occurs, the two are in rigid contact, resulting in damage to the horizontal cover plate.

[0009] Furthermore, vertical grooves corresponding to the number and position of the threaded rods are provided on the sealing block. Hollow tubes fixedly connected thereto are provided in the vertical grooves. The upper ends of the hollow tubes are closed, and the middle of the upper end surface is slidably connected to the threaded rod. A sliding block is provided at the end of the threaded rod located in the hollow tube. The sliding block is slidably connected to the inner wall of the hollow tube. A pressure-regulating spring is provided between the hollow tube and the sliding block. The two ends of the pressure-regulating spring are respectively fixedly connected to the lower end of the hollow tube and the sliding block.

[0010] When the building with the horizontal cover plate undergoes settlement, the sliding block will slide in the hollow tube, thereby compressing the pressure-regulating spring. The acting force of the pressure-regulating spring acts on the sealing block, making the contact effect of the sealing block closer. At the same time, this setting method will not cause the acting force generated during settlement to act completely on the sealing block (when the acting force is too large, the spring will be compressed to adapt to the settlement displacement), resulting in the sealing block being squeezed and deformed, leading to a deterioration of the waterproof effect. When the building with the lower retaining wall undergoes settlement, the spacing between the horizontal cover plate and the lower retaining wall will increase. At this time, the pressure-regulating spring will push the sealing block downward, thereby ensuring the contact pressure and effect between the sealing block and the surface of the lower retaining wall, that is, improving the waterproof effect.

[0011] Furthermore, an auxiliary waterproof mechanism is provided at the end of the horizontal cover plate. The auxiliary waterproof mechanism includes an arc-shaped through groove provided at the end of the lower surface of the horizontal cover plate. A rotating rod is provided in the arc-shaped through groove. A water retaining plate is provided on the rotating rod. One end of the water retaining plate is fixedly connected to the rotating rod. A number of traction springs are provided between the water retaining plate and the horizontal cover plate to closely fit the other end of the water retaining plate to the outer side surface of the retaining wall. The two ends of the traction spring are respectively fixed to the lower surface of the horizontal cover plate and the water retaining plate.

[0012] Under the action of the traction spring, one end of the water baffle is always closely attached to the outer side of the right retaining wall, preventing rainwater from splashing into the gap and corroding and damaging the sealing block. At the same time, the setting of the arc-shaped through groove blocks the rainwater flowing along the inner wall of the horizontal cover plate, preventing rainwater from flowing into the box along the inner wall of the horizontal cover plate. At the same time, in this setting method, no matter which side of the building settles, it will not affect the fitting effect of the water baffle, that is, it can adapt to settlement and ensure the waterproof effect.

[0013] Furthermore, a limiting groove is provided at the position where the upper surface of the right retaining wall contacts the sealing block, and the lower end of the sealing block is located in the limiting groove. The advantage is that even if a small amount of rainwater contacts the sealing block due to various external reasons, the rainwater has to pass through a U-shaped trajectory before it can flow into the expansion joint, that is, the probability of rainwater flowing into the expansion joint is reduced.

[0014] Furthermore, an elastic airbag is provided at one end of the sealing block located in the limiting groove, and several clamping grooves are provided in the limiting groove. The advantage is that the elastic airbag at the end of the sealing block will be squeezed, and after being squeezed, part of the airbag will enter the clamping groove, and the inflated airbag seals the clamping groove. Therefore, rainwater is difficult to flow out of the sealing block and into the expansion joint, further improving the waterproof effect.

[0015] Furthermore, shockproof through grooves are symmetrically provided along the length direction at one end of the sealing block facing the limiting groove. The advantage is that in the event of an earthquake, if the sealing block and the limiting through groove are in close contact, when the building shakes, the sealing block will come into rigid contact with the limiting groove, resulting in detachment or damage. The setting of the shockproof through groove enables the end of the sealing block to slide translationally in the limiting through groove, that is, the probability of the sealing block being damaged is reduced.

[0016] Furthermore, both sides of the installation plate in the length direction are pre-cast and arranged inside the horizontal cover plate, and water guide grooves are provided at positions close to both sides of the length direction of the installation through groove. A water blocking strip corresponding to the position of the water guide groove is provided on the sealing strip. One end of the water blocking strip is fixedly connected to the sealing strip, and the other end is located in the water guide groove and is in close contact with the side of the water guide groove close to the threaded rod. The advantage is that when the sealing strip is damaged or aged and rainwater enters the installation through groove, since the side of the installation plate is cast inside the installation through groove, it can block the rainwater from flowing down along the inner wall. Therefore, the rainwater will flow into the water guide groove and then be discharged through the water guide groove. At the same time, the setting of the water blocking strip can block the incoming rainwater and prevent it from overflowing from the water guide groove and flowing inward through the gap at the threaded rod.

[0017] Furthermore, both the sealing strip and the sealing block are made of waterproof coiled material.

[0018] Furthermore, waterproof coiled materials are laid on the outer sides of the left retaining wall, the right retaining wall, and the horizontal cover plate.

[0019] Furthermore, an avoidance through groove is provided at the position corresponding to the threaded rod on the sealing strip, and the head end of the threaded rod is located in the avoidance through groove, and the beneficial effect thereof is to improve the installation effect of the sealing strip.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) By adopting this optimized deformation joint structure practice, it eliminates the possibility that the unit structures on both sides of the deformation joint generate gaps between the precast concrete cover plates due to inconsistent settlement or deformation. In addition, it avoids the possibility of displacement and side overturning caused by the disturbance of the mortar laid on the waterproof layer due to the trampling during the installation of the precast concrete cover plates by laying mortar. This optimization facilitates the waterproof construction at the deformation joint part, is easy to ensure the waterproof construction quality at the deformation joint part, and reduces the leakage risk;

[0022] (2) By setting the left retaining wall, the right retaining wall, and the horizontal cover plate, a certain self - waterproof structure is achieved, and at the same time, it can also adapt to the settlement of the building;

[0023] (3) When the building unit settles, under the action of the pressure - regulating spring, the sealing block can also adapt to the settlement displacement, thereby ensuring the waterproof effect;

[0024] (4) After the building settles, the contact pressure at the end of the sealing block can also be adjusted by rotating the threaded rod. While ensuring the sealing effect, it also avoids the problem that the internal force received by the sealing block is too large, resulting in deformation and damage.

[0025] Other advantages, objectives, and features of the present invention will be described in the subsequent specification, and to a certain extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0027] Figure 1 It is a three - dimensional schematic diagram of the waterproof structure of the roof deformation joint of the present invention;

[0028] Figure 2 It is a three - dimensional schematic diagram of the horizontal cover plate in the waterproof structure of the roof deformation joint of the present invention;

[0029] Figure 3 It is a three - dimensional schematic diagram of the right retaining wall in the waterproof structure of the roof deformation joint of the present invention;

[0030] Figure 4 This is a three-dimensional schematic diagram of the connection relationship between the mounting plate and the sealing block in the waterproof structure of the roof expansion joint of the present invention;

[0031] Figure 5 This is a left view schematic diagram of the waterproof structure of the roof expansion joint of the present invention;

[0032] Figure 6 This is a left view cross-sectional schematic diagram of the waterproof structure of the roof expansion joint of the present invention;

[0033] Figure 7 is Figure 6 a partial enlarged schematic diagram at position A in

[0034] Figure 8 This is a schematic diagram of the water guide groove and the shockproof through groove provided in the waterproof structure of the roof expansion joint of the present invention;

[0035] Figure 9 This is a front view cross-sectional schematic diagram of the waterproof structure of the roof expansion joint of the present invention;

[0036] Figure 10 is Figure 9 a partial enlarged schematic diagram at position B in

[0037] Figure 11 This is a schematic diagram of the expansion joint sealing structure in the prior art.

[0038] The reference signs in the drawings are as follows:

[0039] Right retaining wall 1, left retaining wall 2, horizontal cover plate 3, installation through groove 4, limit groove 5, card slot 6, mounting plate 7, sealing strip 8, threaded rod 9, sealing block 10, hollow tube 11, sliding block 12, pressure regulating spring 13, arc through groove 14, rotating rod 15, water baffle 16, traction spring 17, elastic airbag 18, water guide groove 19, water retaining strip 20, shockproof through groove 21, avoidance through groove 22. Detailed implementation manners

[0040] As Figures 1 to 10As shown in the figure, a waterproof structure for a roof deformation joint of the present invention includes a left retaining wall 2 and a right retaining wall 1 arranged on both sides in the length direction of the expansion joint. A horizontal cover plate 3 integrally cast with the left retaining wall 2 is provided at the upper end of the left retaining wall 2. The projection of the horizontal cover plate 3 in the vertical direction completely covers the projection of the right retaining wall 1 in the vertical direction. An installation through groove 4 is vertically provided in the length direction of the horizontal cover plate. An installation plate 7 fixedly connected thereto is provided above the installation through groove 4. A plurality of threaded holes are provided in the length direction of the installation plate 7. Threaded rods 9 respectively matingly connected thereto are provided in the threaded holes. A sealing block 10 is provided at one end of the threaded rod 9 facing the right retaining wall 1. The sealing block 10 is slidably connected in the installation through groove 4, and one end is connected to the end of the threaded rod 9, and the other end is in close contact with the upper surface of the right retaining wall 1. Above one end of the threaded rod 9 away from the right retaining wall 1, a sealing strip 8 is provided. The upper surface of the sealing strip 8 is flush with the upper surface of the horizontal cover plate 3.

[0041] The waterproof principle of this technical solution is as follows:

[0042] The height of one retaining wall is relatively high, and a horizontal cover plate 3 is provided at the upper end of the higher retaining wall (left retaining wall 2). The horizontal cover plate 3 covers the expansion joint, so that the self-waterproof effect can be achieved. At the same time, by rotating the threaded rod 9, the sealing block 10 can be pushed downward to make it in close contact with the upper surface of the lower retaining wall (right retaining wall 1), so that the spacing gap between the horizontal cover plate 3 and the upper surface of the lower retaining wall can be sealed, further preventing rainwater from entering the expansion joint through the spacing between the two. At the same time, it should be noted that the purpose of setting a gap between the horizontal cover plate 3 and the lower retaining wall is to adapt to the settlement of the building and avoid the problem that when the settlement occurs, the two are in rigid contact, resulting in damage to the horizontal cover plate 3.

[0043] The sealing block 10 is provided with vertical grooves corresponding to the number and positions of the threaded rods 9. Hollow tubes fixedly connected thereto are provided in the vertical grooves. The upper ends of the hollow tubes are closed, and the middle of the upper end surface is slidably connected to the threaded rod 9. A sliding block 12 is provided at the end of the threaded rod 9 located in the hollow tube. The sliding block 12 is slidably connected to the inner wall of the hollow tube. A pressure regulating spring 13 is provided between the hollow tube and the sliding block 12. The two ends of the pressure regulating spring 13 are respectively fixedly connected to the lower end of the hollow tube and the sliding block 12.

[0044] When the building with the horizontal cover plate 3 settles, the sliding block 12 will slide in the hollow tube, thereby compressing the pressure-regulating spring 13. The acting force of the pressure-regulating spring 13 acts on the sealing block 10, making the contact effect of the sealing block 10 closer. At the same time, this setting method will not cause the acting force generated during settlement to act completely on the sealing block 10 (when the acting force is too large, it will compress the spring to adapt to the settlement displacement), resulting in the sealing block 10 being squeezed and deformed, leading to a poor waterproof effect; when the building with a lower retaining wall settles, the distance between the horizontal cover plate 3 and the lower retaining wall will increase. At this time, the pressure-regulating spring 13 will push the sealing block 10 downward, thereby ensuring the contact pressure and effect between the sealing block 10 and the surface of the lower retaining wall, that is, improving the waterproof effect.

[0045] An auxiliary waterproof mechanism is provided at the end of the horizontal cover plate 3. The auxiliary waterproof mechanism includes an arc-shaped through groove 14 provided at the end of the lower surface of the horizontal cover plate 3. A rotating rod 15 is provided in the arc-shaped through groove 14. A water baffle 16 is provided on the rotating rod 15. One end of the water baffle 16 is fixedly connected to the rotating rod 15. A number of traction springs 17 are provided between the water baffle 16 and the horizontal cover plate 3 to closely attach the other end of the water baffle 16 to the outer side surface of the retaining wall. The two ends of the traction spring 17 are respectively fixed to the lower surface of the horizontal cover plate 3 and the water baffle 16.

[0046] Under the action of the traction spring 17, one end of the water baffle 16 is always closely attached to the outer side surface of the right retaining wall 1, preventing rainwater from splashing into the gap and causing corrosion and damage to the sealing block 10. At the same time, the setting of the arc-shaped through groove 14 blocks the rainwater flowing along the inner wall of the horizontal cover plate 3, preventing rainwater from flowing into the box along the inner wall of the horizontal cover plate 3; at the same time, in this setting method, no matter which side of the building settles, it will not affect the fitting effect of the water baffle 16, that is, it can adapt to settlement and ensure the waterproof effect.

[0047] A limit groove 5 is provided at the position where the upper surface of the right retaining wall 1 contacts the sealing block 10. The lower end of the sealing block 10 is located in the limit groove 5. Even if a small amount of rainwater contacts the sealing block 10 due to various external reasons, the rainwater has to pass through a U-shaped trajectory before flowing into the expansion joint, that is, reducing the probability of rainwater flowing into the expansion joint.

[0048] An elastic airbag 18 is provided at one end of the sealing block 10 located in the limit groove 5. A number of card slots 6 are provided in the limit groove 5. The elastic airbag 18 at the end of the sealing block 10 will be squeezed. After being squeezed, part of the airbag will enter the card slot 6, and the expanded airbag will seal the card slot 6. Therefore, it is difficult for rainwater to flow into the expansion joint from the sealing block 10, further improving the waterproof effect.

[0049] On one end of the sealing block 10 facing the limiting groove 5, anti-seismic through grooves 21 are symmetrically arranged along the length direction. In case of an earthquake, if the sealing block 10 is in close contact with the limiting through groove, when the building shakes, the sealing block 10 will be in rigid contact with the limiting groove 5, resulting in detachment or damage. However, the setting of the anti-seismic through grooves 21 enables the end of the sealing block 10 to slide translationally within the limiting through groove, that is, reduces the probability of the sealing block 10 being damaged.

[0050] On both side surfaces of the mounting plate 7 in the length direction, they are pre-cast and arranged inside the horizontal cover plate 3, and water guide grooves 19 are provided at positions close to both side surfaces of the mounting through groove 4 in the length direction. On the sealing strip 8, a water blocking strip 20 corresponding to the position of the water guide groove 19 is provided. One end of the water blocking strip 20 is fixedly connected to the sealing strip 8, and the other end is located inside the water guide groove 19 and is in close contact with one side of the water guide groove 19 close to the threaded rod 9. When the sealing strip 8 is damaged or aged and rainwater enters the mounting through groove 4, since the side surface of the mounting plate 7 is cast inside the mounting through groove 4, that is, it can block the rainwater from flowing down along the inner wall. Therefore, the rainwater will flow into the water guide groove 19 and then be discharged through the water guide groove 19. At the same time, the setting of the water blocking strip 20 can block the incoming rainwater and prevent it from overflowing from the water guide groove 19 and flowing inward through the gap at the threaded rod 9.

[0051] Both the sealing strip 8 and the sealing block 10 are made of waterproof coiled materials. Waterproof coiled materials are laid on the outer side surfaces of the left retaining wall 2, the right retaining wall 1, and the horizontal cover plate 3. At the position of the sealing strip 8 corresponding to the threaded rod 9, an avoidance through groove 22 is provided, and the head end of the threaded rod 9 is located inside the avoidance through groove 22, improving the installation effect of the sealing strip 8.

[0052] It should be noted that in this technical solution, the description of the left retaining wall 2 and the right retaining wall 1 is only for the convenience of description and does not limit the orientation of the retaining wall. At the same time, for the convenience of installation, the sliding block 12 and the threaded rod 9 are fixedly connected by means of threads. At the same time, the pressure regulating spring 13 and the low end of the hollow tube 11 may not need to be fixedly connected, and the end cover at the end of the hollow tube 11 can be installed and fixed later, mainly playing a role in limiting the sliding block 12.

[0053] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A waterproof structure for roof expansion joints, characterized in that: It includes a left retaining wall and a right retaining wall arranged on both sides of the expansion joint in the length direction. The upper end of the left retaining wall is provided with a horizontal cover plate integrally cast with it. The projection of the horizontal cover plate in the vertical direction completely covers the projection of the right retaining wall in the vertical direction. A vertically arranged installation through groove is provided in the length direction of the horizontal cover plate. An installation plate is fixedly connected to the upper part of the installation through groove. A number of threaded holes are provided in the length direction of the installation plate. Threaded rods are respectively arranged in the threaded holes in a matching connection. A sealing block is arranged at one end of the threaded rod facing the right retaining wall. The sealing block is slidably connected in the installation through groove, with one end connected to the end of the threaded rod and the other end in close contact with the upper surface of the right retaining wall. A sealing strip is arranged above the end of the threaded rod away from the right retaining wall. The upper surface of the sealing strip is flush with the upper surface of the horizontal cover plate.

2. The waterproof structure for roof expansion joints according to claim 1, characterized in that: Vertical grooves corresponding to the number and positions of the threaded rods are provided on the sealing block. Hollow tubes are fixedly connected to the vertical grooves respectively. The upper end of the hollow tube is closed, and the middle part of the upper end surface is slidably connected to the threaded rod. A sliding block is arranged at the end of the threaded rod located in the hollow tube. The sliding block is slidably connected to the inner wall of the hollow tube. A pressure regulating spring is arranged between the hollow tube and the sliding block. The two ends of the pressure regulating spring are respectively fixedly connected to the lower end of the hollow tube and the sliding block.

3. The waterproof structure for roof expansion joints according to claim 1, characterized in that: An auxiliary waterproof mechanism is arranged at the end of the horizontal cover plate. The auxiliary waterproof mechanism includes an arc-shaped through groove arranged on the lower surface end of the horizontal cover plate. A rotating rod is arranged in the arc-shaped through groove. A water retaining plate is arranged on the rotating rod. One end of the water retaining plate is fixedly connected to the rotating rod. A number of traction springs are arranged between the water retaining plate and the horizontal cover plate to closely fit the other end of the water retaining plate to the outer side surface of the retaining wall. The two ends of the traction spring are respectively fixed to the lower surface of the horizontal cover plate and the water retaining plate.

4. The waterproof structure for roof expansion joints according to claim 1, characterized in that: A limiting groove is arranged at the position on the upper surface of the right retaining wall in contact with the sealing block. The lower end of the sealing block is located in the limiting groove.

5. The waterproof structure for roof expansion joints according to claim 4, characterized in that: An elastic airbag is arranged at one end of the sealing block located in the limiting groove. A number of clamping grooves are arranged in the limiting groove.

6. The waterproof structure for roof expansion joints according to claim 4, characterized in that: Shockproof through grooves are symmetrically arranged along the length direction at one end of the sealing block facing the limiting groove.

7. The waterproof structure for roof expansion joints according to claim 1, characterized in that: Both side surfaces in the length direction of the installation plate are pre-cast and disposed inside the horizontal cover plate, and water guide grooves are provided at positions close to both side surfaces in the length direction of the installation through groove. A water blocking strip corresponding to the position of the water guide groove is provided on the sealing strip. One end of the water blocking strip is fixedly connected to the sealing strip, and the other end is located in the water guide groove and is in close contact with the side close to the threaded rod in the water guide groove.

8. A waterproof structure for a roof deformation joint according to claim 1, characterized in that: Both the sealing strip and the sealing block are made of waterproof coiled material.

9. A waterproof structure for a roof deformation joint according to claim 1, characterized in that: Waterproof coiled material is laid on the outer side surfaces of the left retaining wall, the right retaining wall and the horizontal cover plate.

10. A waterproof structure for a roof deformation joint according to claim 1, characterized in that: A relief through groove is provided at the position of the sealing strip corresponding to the threaded rod, and the head end of the threaded rod is located in the relief through groove.

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