Masonry embedded part construction structure

Abstract

The utility model relates to the technical field of masonry construction, and discloses a masonry embedded part construction structure, which solves the problem that an embedded part is inconvenient to accurately and firmly install, and is characterized in that a wall embedded part structure and a template component are arranged, so that the embedded part can be accurately and firmly installed in the process of installing the embedded part; a steel plate A is installed after a formwork body is fixed, an anchor bar A is bound with a wall steel bar body, then the anchor bar A is welded to one side of the steel plate A, a nut A and a screw A are matched to fix the formwork body and the steel plate A, concrete is poured into the wall steel bar body, and a sliding vertical block is used for adjusting a supporting assembly to adjust the vertical height. One side of the formwork body is marked through the transverse ruler plate, subsequent punching operation is facilitated, the movable plate is moved subsequently to be matched with the cleaning brush to complete cleaning, and finally the purpose of accurately fixing the embedded part while firm installation is guaranteed is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of masonry construction, in particular to a masonry embedded part construction structure. Background Art

[0002] The construction structure of masonry embedded parts usually includes the following parts. First, the embedded parts themselves are generally made of metal, such as steel plates or steel bars. During masonry construction, the embedded parts are accurately placed at specific locations of the masonry according to the design requirements, and are usually combined with bricks or stones in the masonry. The masonry around it must be firmly built to ensure the stability of the embedded parts. It plays the role of connecting the masonry with other structures or components, and provides basic support for subsequent installation or connection work.

[0003] The existing Chinese patent with publication number CN217811746U discloses a masonry embedded part construction structure, which relates to the field of masonry construction, and includes a plurality of connection blocks embedded in the wall column, each of which is provided with a tie bar, and the connection block is provided with a through slot for the tie bar to pass through the connection block, and a telescopic rod is provided between adjacent connection blocks, and the telescopic rod is a telescopic structure, and the connection block is provided with a fixing piece for fixing the tie bar in the through slot. Through the fixing piece and the telescopic rod, the tie bar is moved to the required position, and there is no need to embed the tie bar by punching holes, which reduces the damage to the wall caused by punching the wrong pre-embedded holes, and greatly provides convenience for reducing safety hazards. However, during use, the steel bars of this technical solution are reinforced and fixed by tightening bolts, and the fixing method is not strong enough and is easy to loosen. At the same time, it is inconvenient to accurately determine the opening position during the alignment and fixing process, which affects the construction efficiency and installation accuracy.

[0004] In view of the above problems, a masonry embedded parts construction structure is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a masonry embedded component construction structure. The device is adopted to work, thereby solving the problem of inconvenience in accurately and firmly installing the embedded components.

[0006] To achieve the above object, the utility model provides the following technical solutions: a masonry embedded parts construction structure, including a wall reinforcement body, a wall embedded part for enhancing the wall tie strength is arranged on one side of the wall reinforcement body, and a structural column embedded part for enhancing the structural column tie strength is arranged above the wall reinforcement body;

[0007] The wall embedded parts include a steel plate A arranged on one side of the wall steel bar body, an anchor bar A is welded to one side of the steel plate A, and there are two groups of anchor bars A, which are symmetrically arranged. A U-shaped tie bar A is arranged on the other side of the steel plate A, and the U-shaped tie bar A is arranged corresponding to the anchor bar A. A template component is arranged between the U-shaped tie bar A and the anchor bar A. A screw rod A is threadedly connected to one side of the steel plate A, and a nut A is threadedly connected to one end of the screw rod A. The steel plate A is fixed to the screw rod A and the template component through the nut A.

[0008] Furthermore, the template component includes a template body that is bonded to the steel plate A, vertical grooves are opened on both sides of the template body, a side panel is arranged on one side of the vertical groove, a vertical block is fixedly connected to one side of the side panel, the vertical block is slidably connected to the inside of the vertical groove, a support assembly is arranged between the two groups of the side panels, the support assembly includes a support plate fixedly connected between the two groups of the side panels, a horizontal ruler plate is arranged on the surface of the support plate, a slide groove A is opened on one side of the support plate, an inner groove A is opened on one side of the slide groove A, and a cleaning assembly for cleaning is slidably connected to the outer side of the support plate.

[0009] Furthermore, a vertical ruler is fixedly connected to the outer side of the template body, and the vertical ruler is fitted with the support plate.

[0010] Furthermore, the cleaning component includes a movable plate slidably connected to the outside of the support plate, a push plate is fixedly connected to the upper surface of the movable plate, a limit plate is fixedly connected to the inner wall of the movable plate, a magnetic plate A is fixedly connected to one side of the limit plate, the limit plate is slidably connected to the inside of the slide groove A, the magnetic plate A is slidably connected to the inside of the inner groove A, and a cleaning brush is fixedly connected to the bottom surface of the movable plate, and the cleaning brush is in contact with the surface of the support plate.

[0011] Furthermore, an air storage tank is opened inside the support plate, a sealing plate is slidably connected inside the air storage tank, a sealing ring is fixedly connected to the surface of the sealing plate, a magnetic plate B is arranged inside the sealing plate, the magnetic plate B and the magnetic plate A attract each other, an inner plate is fixedly connected to the inner wall of the air storage tank, a one-way pressure valve A is arranged inside the inner plate, an injection pipe is fixedly connected to one side of the support plate, and the injection pipe is connected to the inside of the air storage tank.

[0012] Furthermore, an air supply pipe is fixedly connected to the bottom surface of the support plate, the air supply pipe is communicated with the inside of the air storage tank, and a one-way pressure valve B is provided at the connection between the air supply pipe and the air storage tank.

[0013] Furthermore, a slot A is provided on one side of the side panel, a slot B is provided inside the vertical block, slot A and slot B are provided correspondingly, a plug plate is slidably connected inside slot A, a positioning slot is provided on the inner wall of the vertical slot, and the plug plate and the positioning slot are provided correspondingly.

[0014] Furthermore, rolling grooves are provided on both sides of the vertical block, a rotating rod is fixedly connected to the inner wall of the rolling groove, a rotating stick is fixedly connected to the outer side of the rotating rod, and the rotating stick is fitted with the inner wall of the vertical groove.

[0015] Furthermore, the embedded parts of the structural column include a steel plate B arranged above the main body of the wall reinforcement, an anchor bar B is arranged on the upper surface of the steel plate B, a bolt fixing hole is opened on the upper surface of the steel plate B, and a U-shaped tie bar B is fixedly connected to the bottom surface of the steel plate B.

[0016] Furthermore, the anchor bar B, the U-shaped tie bar B, the anchor bar A and the U-shaped tie bar A all adopt the third-grade steel bars, and the anchor bar A and the anchor bar B are both made by the plug welding method.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The utility model proposes a masonry embedded part construction structure. Through the arrangement of the wall embedded part structure and the template components, during the embedded part installation process, the template body is fixed and then the steel plate A is installed. The anchor bar A is tied to the wall reinforcement body, and then the anchor bar A is welded to one side of the steel plate A. The template body and the steel plate A are fixed by the cooperation of the nut A and the screw rod A. Concrete is poured into the inside of the wall reinforcement body. The vertical height is adjusted by adjusting the support assembly by using a sliding vertical block. One side of the template body is marked by using a horizontal ruler plate to facilitate subsequent punching operations. The movable plate is subsequently moved to cooperate with the cleaning brush to complete cleaning, and finally the purpose of accurately fixing the embedded parts while ensuring a firm installation is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the masonry structure of the utility model.

[0020] Figure 2 This is a schematic diagram of the structure of the wall embedded part of the utility model.

[0021] Figure 3 This is a schematic diagram of the template component structure of the utility model.

[0022] Figure 4 It is a schematic diagram of the cleaning component and the supporting component structure of the utility model.

[0023] Figure 5 It is a side plan view of the cleaning assembly and the supporting assembly of the utility model.

[0024] Figure 6 This is a schematic diagram of the internal structure of the support plate of the utility model.

[0025] Figure 7 For the utility model Figure 3 An enlarged schematic diagram of point A.

[0026] Figure 8 This is a schematic diagram of the internal structure of the vertical block of the utility model.

[0027] In the figure: 1. Wall reinforcement body; 2. Wall embedded parts; 21. Steel plate A; 22. Anchor bar A; 23. Nut A; 24. Screw A; 25. U-shaped tie bar A; 3. Structural column embedded parts; 31. Steel plate B; 32. Anchor bar B; 33. Bolt fixing hole; 34. U-shaped tie bar B; 4. Formwork parts; 41. Formwork body; 411. Positioning slot; 42. Vertical slot; 43. Vertical ruler plate; 44. Horizontal ruler plate; 45. Side plate; 451. Slot A; 452. Insert plate; 453. Vertical block; 454. Insert plate Groove B; 455, rolling groove; 456, rotating rod; 457, rotating stick; 46, cleaning assembly; 461, movable plate; 462, cleaning brush; 463, push plate; 464, limit plate; 465, magnetic plate A; 47, supporting assembly; 471, supporting plate; 472, slide groove A; 473, inner groove A; 474, air storage tank; 475, sealing plate; 476, magnetic plate B; 477, sealing ring; 478, inner plate; 479, one-way pressure valve A; 48, jet pipe; 49, air supply pipe; 491, one-way pressure valve B. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings.

[0030] Combination Figure 1-Figure 2 A masonry embedded part construction structure comprises a wall reinforcement body 1, a wall embedded part 2 for enhancing the wall tie strength is arranged on one side of the wall reinforcement body 1, and a structural column embedded part 3 for enhancing the structural column tie strength is arranged above the wall reinforcement body 1;

[0031] The wall embedded part 2 includes a steel plate A21 arranged on one side of the wall reinforcement body 1, and an anchor bar A22 is welded on one side of the steel plate A21. There are two groups of anchor bars A22, and the two groups of anchor bars A22 are symmetrically arranged. A U-shaped tie bar A25 is arranged on the other side of the steel plate A21. The U-shaped tie bar A25 is arranged corresponding to the anchor bar A22. A template component 4 is arranged between the U-shaped tie bar A25 and the anchor bar A22. A screw rod A24 is threadedly connected to one side of the steel plate A21, and a nut A23 is threadedly connected to one end of the screw A24. The steel plate A21 is fixed to the screw rod A24 and the template component 4 through the nut A23. During the masonry process, the formwork component 4 is initially fixed and then the steel plate A21 is installed. It is tied and connected to the wall reinforcement body 1 through the anchor bar A22, the anchor bar A22 is welded to one side of the steel plate A21, and then the formwork component 4 is fixed to the steel plate A21 through the nut A23 and the screw A24. At this time, concrete is poured into the wall reinforcement body 1. After the concrete strength reaches the requirement, the screw A24 is removed and the formwork component 4 is removed. The U-shaped tie bar A25 is welded to the other side of the steel plate A21 by double-sided full welding. The U-shaped tie bar A25 is connected to the reinforcement structure in the structural column to complete the installation of embedded parts and construction work.

[0032] See also Figure 1-Figure 8 The template component 4 includes a template body 41 that fits the steel plate A21, vertical grooves 42 are provided on both sides of the template body 41, a side plate 45 is provided on one side of the vertical groove 42, a vertical block 453 is fixedly connected to one side of the side plate 45, and the vertical block 453 is slidably connected to the inside of the vertical groove 42, and a support assembly 47 is provided between the two groups of the side plates 45, and the support assembly 47 includes a support plate 471 fixedly connected between the two groups of the side plates 45, a horizontal plate 44 is provided on the surface of the support plate 471, and a sliding Groove A472, an inner groove A473 is provided on one side of the slide groove A472, and a cleaning component 46 for cleaning is slidably connected to the outer side of the support plate 471. When installing the nut A23 and the screw A24, it is necessary to drill holes in the template body 41. When adjusting the drilling position and the drilling size, use the sliding vertical block 453 to adjust the vertical height of the support component 47. After adjusting to the appropriate height, align the horizontal ruler 44 with the surface of the template body 41, and mark one side of the template body 41 according to the scale to facilitate subsequent punching operations.

[0033] A vertical ruler plate 43 is fixedly connected to the outer side of the template body 41 , and the vertical ruler plate 43 is in contact with the support plate 471 . The height of the support assembly 47 can be easily determined by setting the vertical ruler plate 43 .

[0034] The cleaning component 46 includes a movable plate 461 which is slidably connected to the outside of the support plate 471, a push plate 463 is fixedly connected to the upper surface of the movable plate 461, a limit plate 464 is fixedly connected to the inner wall of the movable plate 461, a magnetic plate A465 is fixedly connected to one side of the limit plate 464, the limit plate 464 is slidably connected to the inside of the slide groove A472, the magnetic plate A465 is slidably connected to the inside of the inner groove A473, and a cleaning brush 462 is fixedly connected to the bottom surface of the movable plate 461, and the cleaning brush 462 is in contact with the surface of the support plate 471. Through the arrangement of the movable plate 461, the limit plate 464 and the magnetic plate A465, the sliding stability of the movable plate 461 is guaranteed under the limiting action of the slide groove A472 and the inner groove A473, and the cleaning brush 462 is in contact with the surface of the support plate 471 to ensure the clarity of the surface of the horizontal ruler 44 through cleaning.

[0035] An air storage tank 474 is provided inside the support plate 471, and a sealing plate 475 is slidably connected inside the air storage tank 474. A sealing ring 477 is fixedly connected to the surface of the sealing plate 475, and a magnetic plate B476 is arranged inside the sealing plate 475. The magnetic plate B476 and the magnetic plate A465 attract each other. An inner plate 478 is fixedly connected to the inner wall of the air storage tank 474, and a one-way pressure valve A479 is arranged inside the inner plate 478. An air jet pipe 48 is fixedly connected to one side of the support plate 471, and the air jet pipe 48 is connected to the inside of the air storage tank 474. During the movement of the movable plate 461, the sealing plate 475 is driven to move together with the movable plate 461 under the action of the mutual attraction between the magnetic plate A465 and the magnetic plate B476, and the air inside the air storage tank 474 is squeezed toward the one-way pressure valve A479, and finally discharged through the air jet pipe 48 for inflation to blow away the waste chips generated by punching.

[0036] An air supply pipe 49 is fixedly connected to the bottom surface of the support plate 471, and the air supply pipe 49 is connected to the inside of the air storage tank 474. A one-way pressure valve B491 is arranged at the connection between the air supply pipe 49 and the air storage tank 474. Through the setting of the air supply pipe 49 and the one-way pressure valve B491, during the resetting process of the sealing plate 475, the air storage tank 474 is in a negative pressure state, and air is extracted through the one-way pressure valve B491 and the air supply pipe 49 to replenish air to the inside of the air storage tank 474 and balance the air pressure.

[0037] A slot A451 is provided on one side of the side panel 45, a slot B454 is provided inside the vertical block 453, the slot A451 and the slot B454 are arranged correspondingly, an insert plate 452 is slidably connected inside the slot A451, a positioning slot 411 is provided on the inner wall of the vertical slot 42, the insert plate 452 and the positioning slot 411 are arranged correspondingly, when the side panel 45 is fixed after adjusting the height, the insert plate 452 is inserted into the slot A451 and the slot B454, and the insert plate 452 is engaged with the positioning slot 411 to complete the fixation.

[0038] Rolling grooves 455 are provided on both sides of the vertical block 453. A rotating rod 456 is fixedly connected to the inner wall of the rolling groove 455. A rotating stick 457 is fixedly connected to the outer side of the rotating rod 456. The rotating stick 457 is in contact with the inner wall of the vertical groove 42. Through the arrangement of the rotating rod 456 and the rotating stick 457, during the movement of the vertical block 453, the friction is reduced by the rolling of the rotating stick 457, thereby ensuring that the support plate 471 always remains horizontal.

[0039] The structural column embedded part 3 includes a steel plate B31 arranged above the wall reinforcement body 1, an anchor bar B32 is arranged on the upper surface of the steel plate B31, a bolt fixing hole 33 is opened on the upper surface of the steel plate B31, and a U-shaped tie bar B34 is fixedly connected to the bottom surface of the steel plate B31. The wall embedded part 2 and the wall reinforcement body 1 are fixed together by the arrangement of the steel plate B31, the anchor bar B32, the bolt fixing hole 33 and the U-shaped tie bar B34. The structural column embedded part 3 is similar in structure to the wall embedded part 2, thereby ensuring a stable tie effect.

[0040] Anchor bars B32, U-shaped tie bars B34, anchor bars A22 and U-shaped tie bars A25 all use grade three steel bars. Anchor bars A22 and anchor bars B32 all use plug welding method. Grade three steel bars are used to ensure stability during installation and fixation, ensure welding quality and ensure welding strength.

[0041] Specifically, during the masonry process, after the template component 4 is initially fixed, the steel plate A21 is installed, and it is tied and connected with the wall reinforcement body 1 through the anchor bar A22, the anchor bar A22 is welded to one side of the steel plate A21, and then the template component 4 is fixed to the steel plate A21 through the nut A23 and the screw A24. At this time, concrete is poured into the wall reinforcement body 1. After the concrete strength reaches the requirement, the template body 41 is drilled. When adjusting the drilling position and the drilling size, the sliding vertical block 453 is used to adjust the vertical height of the support assembly 47. When fixing the side plate 45 after adjusting the height, the plug plate 452 is inserted into the slot A451 and the slot B454, and the plug plate 452 is clamped with the positioning groove 411 to complete the fixation, and the horizontal ruler 44 is aligned with the surface of the template body 41. Marks are made on one side of the template body 41 according to the scale to facilitate subsequent punching operations. The movable plate 46 is ensured under the limiting action of the slide groove A472 and the inner groove A473. 1 Sliding stability, use the cleaning brush 462 to fit the surface of the support plate 471, and ensure the clarity of the surface of the horizontal ruler 44 by cleaning. During the movement of the movable plate 461, under the mutual attraction between the magnetic plate A465 and the magnetic plate B476, the sealing plate 475 is driven to move with the movable plate 461, and the air inside the air storage tank 474 is squeezed to the one-way pressure valve A479, and finally discharged through the jet pipe 48 for blowing to blow away the waste generated by punching. The air supply pipe 49 and the one-way pressure valve B491 are used to balance the air pressure. Finally, the screw A24 is removed and the template component 4 is removed. The U-shaped tie bar A25 is welded to the other side of the steel plate A21 by double-sided full welding. The U-shaped tie bar A25 is connected to the steel bar structure in the structural column to complete the installation and construction of the embedded parts. The structural column embedded part 3 is similar in structure to the wall embedded part 2, which ensures a stable tie effect, and finally achieves the purpose of ensuring a firm installation while accurately fixing the embedded parts.

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A masonry embedded part construction structure, comprising a wall reinforcement body (1), characterized in that: A wall embedded part (2) for enhancing the wall's tie strength is arranged on one side of the wall reinforcement body (1); a structural column embedded part (3) for enhancing the structural column's tie strength is arranged above the wall reinforcement body (1); The wall embedded part (2) comprises a steel plate A (21) arranged on one side of a wall reinforcement body (1); an anchor bar A (22) is welded to one side of the steel plate A (21); two groups of anchor bars A (22) are arranged symmetrically; a U-shaped tie bar A (25) is arranged on the other side of the steel plate A (21); the U-shaped tie bar A (25) and the anchor bar A (22) are arranged correspondingly; a template component (4) is arranged between the U-shaped tie bar A (25) and the anchor bar A (22); a screw rod A (24) is threadedly connected to one side of the steel plate A (21); a nut A (23) is threadedly connected to one end of the screw rod A (24); and the steel plate A (21) is fixed to the screw rod A (24) and the template component (4) via the nut A (23).

2. A masonry embedded part construction structure according to claim 1, characterized in that: The template component (4) includes a template body (41) that is fitted with a steel plate A (21), and vertical grooves (42) are provided on both sides of the template body (41). A side plate (45) is provided on one side of the vertical groove (42), and a vertical block (453) is fixedly connected to one side of the side plate (45), and the vertical block (453) is slidably connected to the inside of the vertical groove (42). A support assembly (47) is provided between the two groups of side plates (45), and the support assembly (47) includes a support plate (471) that is fixedly connected between the two groups of side plates (45), and a horizontal ruler (44) is provided on the surface of the support plate (471), and a slide groove A (472) is provided on one side of the support plate (471), and an inner groove A (473) is provided on one side of the slide groove A (472). A cleaning assembly (46) for cleaning is slidably connected to the outer side of the support plate (471).

3. A masonry embedded part construction structure according to claim 2, characterized in that: A vertical ruler plate (43) is fixedly connected to the outer side of the template body (41), and the vertical ruler plate (43) is in close contact with the support plate (471).

4. A masonry embedded part construction structure according to claim 2, characterized in that: The cleaning assembly (46) comprises a movable plate (461) slidably connected to the outside of the support plate (471); a push plate (463) is fixedly connected to the upper surface of the movable plate (461); a limit plate (464) is fixedly connected to the inner wall of the movable plate (461); a magnetic plate A (465) is fixedly connected to one side of the limit plate (464); the limit plate (464) is slidably connected to the inside of the slide groove A (472); the magnetic plate A (465) is slidably connected to the inside of the inner groove A (473); a cleaning brush (462) is fixedly connected to the bottom surface of the movable plate (461); and the cleaning brush (462) is in contact with the surface of the support plate (471).

5. A masonry embedded part construction structure according to claim 4, characterized in that: An air storage tank (474) is provided inside the support plate (471), a sealing plate (475) is slidably connected inside the air storage tank (474), a sealing ring (477) is fixedly connected to the surface of the sealing plate (475), a magnetic plate B (476) is provided inside the sealing plate (475), the magnetic plate B (476) and the magnetic plate A (465) attract each other, an inner plate (478) is fixedly connected to the inner wall of the air storage tank (474), a one-way pressure valve A (479) is provided inside the inner plate (478), and an air injection pipe (48) is fixedly connected to one side of the support plate (471), and the air injection pipe (48) is communicated with the inside of the air storage tank (474).

6. A masonry embedded part construction structure according to claim 5, characterized in that: The bottom surface of the support plate (471) is fixedly connected with an air supply pipe (49), the air supply pipe (49) is communicated with the inside of the air storage tank (474), and a one-way pressure valve B (491) is provided at the connection between the air supply pipe (49) and the air storage tank (474).

7. A masonry embedded part construction structure according to claim 2, characterized in that: A slot A (451) is formed on one side of the side plate (45), a slot B (454) is formed inside the vertical block (453), the slot A (451) and the slot B (454) are arranged correspondingly, an insert plate (452) is slidably connected inside the slot A (451), a positioning slot (411) is formed on the inner wall of the vertical slot (42), and the insert plate (452) and the positioning slot (411) are arranged correspondingly.

8. A masonry embedded component construction structure according to claim 7, characterized in that: Both sides of the vertical block (453) are provided with rolling grooves (455), the inner wall of the rolling groove (455) is fixedly connected with a rotating rod (456), the outer side of the rotating rod (456) is fixedly connected with a rotating stick (457), and the rotating stick (457) is in contact with the inner wall of the vertical groove (42).

9. The masonry embedded component construction structure according to claim 1, characterized in that: The structural column embedded part (3) comprises a steel plate B (31) arranged above the wall reinforcement body (1), an anchor bar B (32) being arranged on the upper surface of the steel plate B (31), a bolt fixing hole (33) being opened on the upper surface of the steel plate B (31), and a U-shaped tie bar B (34) being fixedly connected to the bottom surface of the steel plate B (31).

10. A masonry embedded part construction structure according to claim 9, characterized in that: The anchor bar B (32), the U-shaped tie bar B (34), the anchor bar A (22) and the U-shaped tie bar A (25) are all made of grade 3 steel bars. The anchor bar A (22) and the anchor bar B (32) are both welded by plug welding.

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