Construction method for precast wall damper plugging

Abstract

The present application relates to a kind of prefabricated wall type damper plugging structure and its construction method, the plugging structure includes the two steel framework of metal damper back and front, vertical keel is fixed in the lower end of upper cantilever wall;Vertical keel is divided into left keel bundle and right keel bundle two groups, and metal damper is arranged in the interval between two groups of vertical keel;Ground keel is used to connect the lower end of each vertical keel of left keel bundle and right keel bundle;Ground keel and upper end of lower cantilever wall are provided with reserved interval, and the reserved interval is filled with cement mortar;The construction method is: first, steel framework is made, cement mortar is daubed in the top end of lower cantilever wall according to the reserved interval height, then steel framework is installed between upper and lower cantilever, and the upper end of steel framework is fixedly connected with upper cantilever wall, and the lower end is placed on the top surface of cement mortar;Steel framework on the back of metal damper installs horizontal keel to reinforce frame body, and the steel framework on the front side reserves maintenance door area;Rock wool is filled in the space of steel framework, and panel and surface layer construction are carried out, and finally maintenance door is installed.

Description

Technical Field

[0001] This invention pertains to the construction technology of external energy dissipation and vibration reduction structures, specifically involving a construction method for sealing prefabricated wall-type dampers. Background Technology

[0002] With the development of the construction industry, energy dissipation and vibration reduction technology is being increasingly used in super high-rise and large public building projects. Structural systems employing energy dissipation and vibration reduction technology offer higher safety, economy, and technical rationality. Among them, the metal composite damper (MHD) is a new type of seismic damper. It is a damper with simple construction, readily available materials, and good performance, and can be used for wind and earthquake resistance in high-rise structures.

[0003] The use of metal composite dampers encountered the following problems during construction: ① This type of damper has a resettable capability, requiring a flexible connection between the upper and lower cantilever walls and the installation of inspection ports, which increases construction difficulty and quality control challenges. ② Due to the flexible connection between the upper and lower cantilever walls, the damper's operation significantly impacts the connection structure, making rework and repair difficult and costly. ③ Traditional sealing methods require complete removal and restoration of the sealing layer if the metal composite damper needs to be replaced, resulting in complex operations and material waste. ④ On-site processing, fabrication, and installation lead to low construction efficiency and slow construction speed. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a prefabricated wall-type damper sealing structure and its construction method, thereby improving construction efficiency and ensuring construction quality.

[0005] The technical solution adopted by the present invention to solve the aforementioned problem is as follows:

[0006] A precast wall-type damper sealing structure is installed between an upper cantilever wall and a lower cantilever wall, comprising two steel frames; the two steel frames are symmetrically arranged on the back and front of the metal damper, and the steel frames are composed of a top joist, vertical joists, and a bottom joist.

[0007] The top keel is fixed to the lower end of the upper cantilever wall and is the same length as the upper cantilever wall; the vertical keel is divided into two groups: the left keel bundle and the right keel bundle, with several keels in each group, which are fixed to the lower ends of the top keel; metal dampers are installed in the interval between the left keel bundle and the right keel bundle; there are two ground keels, which are used to connect the lower ends of each vertical keel in the left keel bundle and the right keel bundle; a reserved gap is set between the ground keel and the upper end of the lower cantilever wall, and the reserved gap is filled with cement mortar.

[0008] Compared with the prior art, the present invention employing the above structure has the following advantages:

[0009] The upper and lower cantilever arms are supported by a steel frame, which can be prefabricated and installed as a whole, making construction convenient. By reserving a gap between the steel frame and the cantilever wall, a weak point is set. After long-term vibration and stress, cracks will appear at the designated gap, which effectively controls the location of building wear and tear, avoids overall wall damage or damage to uncontrollable locations, and facilitates later repairs.

[0010] As a preferred option, a further technical solution to the above structure is:

[0011] At least the steel frame on the back side of the metal damper is provided with a horizontal keel. The horizontal keel is divided into an upper horizontal keel and a lower horizontal keel. The two ends of the upper horizontal keel are connected to the inner sides of the left keel bundle and the right keel bundle, and the two ends of the lower horizontal keel are connected to the ground keel.

[0012] The beneficial effects obtained from the above features are: the overall performance of the precast frame can be enhanced by adding horizontal keels.

[0013] The steel frame on the front of the metal damper is equipped with an inspection door, the hinge end of which is connected to the vertical joists.

[0014] The beneficial effect obtained from the above features is that the metal dampers can be easily repaired during the building maintenance period through the access door.

[0015] The present invention also provides a construction method for the above-mentioned prefabricated wall-type damper sealing structure, the specific steps of which are as follows:

[0016] The first step is to cut the upper joists according to the width of the upper cantilever wall; the second step is to cut the vertical joists according to the distance between the upper and lower cantilever walls and the designed reserved interval size; and the third step is to cut the lower joists according to the length of the metal dampers.

[0017] The second step is to use nails to fix the top keel, vertical keel and ground keel to form a steel frame;

[0018] The third step is to apply cement mortar to the top of the lower cantilever wall according to the reserved interval and wait for the cement mortar to harden.

[0019] The fourth step is to place one steel frame on the back of the metal damper and the other steel frame on the front of the metal damper. Taking into account the thickness of the outer wall panel and the surface treatment, the steel frame is positioned and leveled. The joists are reinforced with expansion bolts to the upper cantilever wall, with a bolt spacing of no more than 500mm. The lower end of the steel frame is attached to the top surface of the cement mortar.

[0020] Fifth step: Arrange two horizontal keels on the back steel frame. The upper horizontal keel is fixed to the vertical keel, and the lower horizontal keel is fixed to the ground keel. Reserve an area for the maintenance door and fill the gaps in the steel frame with rock wool.

[0021] The sixth step involves installing the panels and surface layers on all areas except the inspection door area, followed by the final installation of the inspection door.

[0022] Compared with the prior art, the present invention employing the above method has the following advantages:

[0023] 1) The frame can be centrally fabricated and then installed as a whole, making construction convenient, improving efficiency, saving labor, and reducing costs. 2) Construction quality is easy to control. 3) The steel frame works together with the cantilever wall through a cement mortar layer. Under long-term action, only some horizontal cracks appear at the lower edge of the frame, avoiding overall damage. This maintains aesthetics and facilitates later repairs, saving costs. 4) If the dampers need to be replaced, the entire prefabricated frame can be dismantled and reinstalled simply using expansion bolts. It can also be reused, ensuring convenient construction while enhancing material turnover and reducing costs.

[0024] Optionally, the top joists, bottom joists, and vertical joists are made of 75×40 U-shaped steel with a thickness of 0.6mm, and the horizontal joists are made of 50×32 U-shaped steel with a thickness of 0.5mm.

[0025] Optionally, a 20mm gap is reserved on the lower side of the ground joists.

[0026] Optionally, the installation of the access door is as follows: 1) Prepare a door leaf with a height adapted to the top and bottom joists; 2) Install a hinge on the hinge side of the door leaf, and fix the other end of the hinge to the square steel tube; 3) Embed the square steel tube in the vertical joist near the damper; 4) Install an adjustment layer in the gap between the back of the square steel tube and the vertical joist, and use the thickness of the adjustment layer to support the access door to be flush with the outer side of the cantilever wall; 5) Fix it by using nails to penetrate the vertical joist, adjustment layer and square steel tube.

[0027] Optionally, the installation of the access door is as follows: 1) Design two horizontal keels on the front steel frame and prepare an access door leaf that matches the spacing between the two horizontal keels; 2) Install hinges and square steel tubes on the axial side of the door leaf; 3) Embed the square steel tubes between the two horizontal keels and install an adjustment layer in the gap between the square steel tubes and the vertical keels; 4) Fix the door by passing through the vertical keels, adjustment layer, horizontal keels and square steel tubes with nails. Attached Figure Description

[0028] Figure 1 This is a front structural diagram of the cantilever wall support frame arrangement of the present invention;

[0029] Figure 2 This is a side view of the cantilever wall support frame arrangement of the present invention;

[0030] Figure 3 This is a schematic diagram of the back steel frame structure of the present invention;

[0031] Figure 4 This is the side structure of the back steel frame of the present invention;

[0032] Figure 5 This is a structural diagram of point A of the back steel frame of the present invention;

[0033] Figure 6 This is a front view of the steel frame structure of the present invention;

[0034] Figure 7 This is a perspective view of the front steel frame and back structure of the present invention;

[0035] Figure 8 This is a structural diagram of the steel frame at point B on the front of the present invention.

[0036] Explanation of reference numerals in the attached drawings: 1. Upper cantilever wall; 2. Lower cantilever wall; 3. Metal damper; 4. Steel frame; 41. Back side steel frame; 42. Front steel frame; 401. Top joist; 402. Vertical joist; 403. Ground joist; 5. Cement mortar; 6. Horizontal joist; 7. Inspection door; 8. Hinge; 9. Square steel pipe; 10. Adjustable layer; 11. Panel. Detailed Implementation

[0037] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0038] The design concept of this invention is as follows: A metal frame supports the space between the upper cantilever wall 1 and the lower cantilever wall 2, surrounding a metal damper 3. A gap is left between the bottom of the steel frame 4 and the lower cantilever wall, and mortar is applied to the wall, creating a weakly connected, easily misaligned sliding structure between the bottom of the steel frame 4 and the top of the lower cantilever wall 2. The frame is designed with U-shaped keel. In this embodiment, for a wall thickness of 200mm, two materials are used: Model 1 (75×40, 0.6mm thick U-shaped steel) and Model 2 (50×32, 0.5mm thick U-shaped steel). The specific keel specifications can be selected according to the actual site conditions.

[0039] Specifically, this invention provides a prefabricated wall-type damper sealing structure, installed between an upper cantilever wall 1 and a lower cantilever wall 2, comprising two steel frames 4; the two steel frames 4 are symmetrically arranged on the back and front of the metal damper 3, and the steel frames 4 are composed of a top joist 401, a vertical joist 402, and a bottom joist 403.

[0040] Tianlong 401 is fixed to the lower end of the upper cantilever wall 1 and is the same length as the upper cantilever wall 1.

[0041] The vertical keel 402 is divided into two groups: the left keel bundle and the right keel bundle. Each group has several keels, which are fixed to the lower ends of the top keel 401. A metal damper 3 is provided in the interval between the left keel bundle and the right keel bundle.

[0042] The ground keel 403 has two members, which are used to connect the lower ends of the vertical keels 402 of the left keel bundle and the right keel bundle respectively; a reserved gap is set between the ground keel 403 and the upper end of the lower cantilever wall 2, and the reserved gap is filled with cement mortar 5.

[0043] Specifically, at least the steel frame 4 on the back side of the metal damper 3 is provided with a horizontal keel 6. The horizontal keel 6 is divided into an upper horizontal keel 6 and a lower horizontal keel 6. The two ends of the upper horizontal keel 6 are connected to the inner sides of the left keel bundle and the right keel bundle, and the two ends of the lower horizontal keel 6 are connected to the ground keel 403.

[0044] Optionally, the front steel frame 42 of the metal damper 3 is provided with an inspection door 7, and the shaft end of the inspection door 7 is connected to the vertical keel 402.

[0045] The construction method of the above-mentioned precast wall-type damper sealing structure is described in detail below with reference to specific embodiments:

[0046] The first step involves fabricating the top joists 401, vertical joists 402, and bottom joists 403 using 75×40mm, 0.6mm thick U-shaped steel (Type 1), while the horizontal joists 6 use 50×32mm, 0.5mm thick U-shaped steel (Type 2). The Type 1 bottom joists 403 and top joists 401 are chosen because their dimensions will not collide with the metal dampers 3. The joist dimensions can be adjusted for different types of wall dampers. The Type 2 horizontal joists 6 are chosen primarily because the dimensions of the metal dampers 3 and the outer wall structure are relatively small; a smaller joist is selected to prevent collisions between the horizontal joists 6 and the metal dampers 3. Additionally, adding horizontal joists 6 enhances the overall performance of the precast frame. The top joists 401 are cut according to the width of the upper cantilever wall 1; the vertical joists 402 are cut according to the distance between the upper and lower cantilever walls 1 and the designed reserved interval; and the bottom joists 403 are cut according to the length of the metal dampers 3.

[0047] The second step is to use nails to fix the top keel 401, vertical keel 402 and bottom keel 403 to form a steel frame 4.

[0048] The third step is to apply cement mortar 5 to the top of the lower cantilever wall 2 according to the reserved interval and wait for the cement mortar 5 to harden; in this embodiment, the reserved interval is designed to be 20mm.

[0049] Fourth step, take one steel frame 4 and set it on the back side of the metal damper 3, and take another steel frame 4 and set it on the front side of the metal damper 3. Taking into account the thickness of the outer layer of the wall panel and the surface treatment, position and level the steel frame 4. Use expansion bolts to reinforce the upper cantilever wall 1 with the joists 401. The bolt spacing is no more than 500mm. The lower end of the steel frame 4 abuts against the top surface of the cement mortar 5.

[0050] Fifth step, two horizontal keels 6 are arranged on the back steel frame 41. The upper horizontal keel 6 is fixed to the vertical keel 402, and the lower horizontal keel 6 is fixed to the ground keel 403. An inspection door 7 area is reserved on the front steel frame 42, and rock wool is filled in the space of the steel frame 4.

[0051] Step 6: Construction of panel 11 and surface layer is carried out on other parts except for the inspection door 7 area, and finally the inspection door 7 is installed.

[0052] Specifically, the installation of inspection door 7 is as follows:

[0053] Example of a larger access door 7: 1) Prepare a door leaf with a height adapted to the top joists 401 and the bottom joists 403; 2) Install hinges 8 on the axial side of the door leaf, and fix the other end of the hinges 8 to the square steel tube 9; 3) Embed the square steel tube 9 in the vertical joists 402 near the damper; 4) Install an adjustment layer 10 in the gap between the back of the square steel tube 9 and the vertical joists 402, and use the thickness of the adjustment layer 10 to support the access door 7 to be flush with the outer side of the cantilever wall; 5) Fix it by using nails to penetrate the vertical joists 402, the adjustment layer 10 and the square steel tube 9.

[0054] Example of a smaller access door 7: 1) Two horizontal keels 6 are designed on the front steel frame 42, and an access door 7 leaf with a spacing that matches the two horizontal keels 6 is prepared; 2) Hinges 8 and square steel tubes 9 are installed on the axial side of the door leaf; 3) The square steel tubes 9 are embedded between the two horizontal keels 6, and an adjustment layer 10 is installed in the gap between the square steel tubes 9 and the vertical keel 402; 4) The door is fixed by nailing through the vertical keel 402, the adjustment layer 10, the horizontal keels 6 and the square steel tubes 9.

[0055] The adjustment layer 10 needs to be designed separately, using gypsum board, gaskets and other materials of appropriate thickness. The thickness of the adjustment layer 10 and the model of the hinge 8 are used to ensure that the outer surface of the inspection door 7 is on the same plane as the surface layer of other areas after completion, and to ensure vertical flatness.

[0056] The purpose of the 5 layers of cement mortar in the reserved interval is twofold: firstly, to level areas with dimensional deviations; and secondly, to install the steel frame 4 on the cement mortar 5 without using bolts for connection, so that when the damper is in action, the frame can slide with the upper suspended wall, reducing the risk of damage to the frame.

[0057] Rock wool primarily serves as a protective and soundproofing material.

[0058] The beneficial effects of this invention are: 1) The frame can be centrally processed and then installed as a whole, which facilitates construction, improves efficiency, saves labor, and reduces costs. 2) Construction quality is easy to control. 3) The frame works together with the cantilever wall through a cement mortar layer. Under long-term action, only some cracks appear in the horizontal direction at the lower part of the device, avoiding overall damage. This does not affect the aesthetics and facilitates later repairs, saving costs. 4) If the damper needs to be replaced, the entire prefabricated frame can be dismantled and installed using only expansion bolts. It can also be reused, ensuring convenient construction while enhancing material turnover and reducing costs.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A construction method for sealing precast wall-type dampers, characterized in that, Its sealing structure is set between the upper cantilever wall (1) and the lower cantilever wall (2), characterized in that it includes two steel frames (4); the two steel frames (4) are symmetrically arranged on the back and front of the metal damper (3), the steel frame (4) is composed of a top keel (401), a vertical keel (402) and a bottom keel (403), the top keel (401) is fixed to the lower end of the upper cantilever wall (1) and is the same length as the upper cantilever wall (1); the vertical keel (402) is divided into two groups, a left keel bundle and a right keel bundle, each group having several pieces, which are respectively fixed to the lower ends of the top keel (401); a metal damper (3) is set in the interval between the left keel bundle and the right keel bundle; the bottom keel (403) has two The roots are used to connect the lower ends of the vertical keels (402) of the left and right keel bundles respectively; the ground keel (403) and the upper end of the lower cantilever wall (2) are provided with a reserved gap, and the reserved gap is filled with cement mortar (5); at least the steel frame (4) on the back side of the metal damper (3) is provided with a horizontal keel (6), the horizontal keel (6) is divided into an upper horizontal keel (6) and a lower horizontal keel (6), the two ends of the upper horizontal keel (6) are connected to the inner side of the left and right keel bundles, and the two ends of the lower horizontal keel (6) are connected to the ground keel (403). The steel frame (4) on the front side of the metal damper (3) is provided with an inspection door (7), and the shaft end of the inspection door (7) is connected to the vertical keel (402); The construction process shall be carried out in the following steps: The first step is to cut the upper keel (401) according to the width of the upper cantilever wall (1); cut the vertical keel (402) according to the distance between the upper cantilever wall (1) and the lower cantilever wall (2) and the size of the reserved interval designed; and cut the ground keel (403) according to the length of the metal damper (3). The second step is to use nails to fix the top keel (401), vertical keel (402) and bottom keel (403) to form a steel frame (4). The third step is to apply cement mortar (5) to the top of the lower cantilever wall (2) according to the reserved interval and wait for the cement mortar (5) to harden. Fourth step, take one steel frame (4) and set it on the back of the metal damper (3), and take another steel frame (4) and set it on the front of the metal damper (3). Taking into account the thickness of the outer layer of the wall panel and the surface construction method, position and level the steel frame (4). Use expansion bolts to reinforce the upper cantilever wall (1) with the joists (401). The bolt spacing is no more than 500mm. The lower end of the steel frame (4) abuts against the top surface of the cement mortar (5). Fifth step, arrange two horizontal keels (6) on the back steel frame (4), fix the upper horizontal keel (6) to the vertical keel (402), fix the lower horizontal keel (6) to the ground keel (403), reserve the area for the maintenance door (7), and fill the space in the steel frame (4) with rock wool; Step 6: Construction of panels (11) and surface layer is carried out on other parts except for the inspection door (7) area, and finally the inspection door (7) is installed.

2. The construction method for sealing precast wall dampers according to claim 1, characterized in that: The top keel (401), bottom keel (403) and vertical keel (402) are made of 75×40, 0.6mm thick U-shaped steel, and the horizontal keel (6) is made of 50×32, 0.5mm thick U-shaped steel.

3. The construction method for sealing precast wall dampers according to claim 1, characterized in that: The reserved gap height on the lower side of the ground keel (403) is 20mm.

4. The construction method for sealing precast wall dampers according to claim 1, characterized in that: The specific installation of the inspection door (7) is as follows: 1) Prepare a door leaf with a height that is compatible with the top keel (401) and the bottom keel (403); 2) Install a hinge (8) on the axial side of the door leaf, and fix the other end of the hinge (8) to the square steel pipe (9); 3) Embed the square steel pipe (9) in the vertical keel (402) near the damper; 4) Install an adjustment layer (10) in the gap between the back side of the square steel pipe (9) and the vertical keel (402), and use the thickness of the adjustment layer (10) to support the inspection door (7) to be flush with the outer side of the cantilever wall; 5) Fix it by using nails to penetrate the vertical keel (402), the adjustment layer (10) and the square steel pipe (9).

5. The construction method for sealing precast wall dampers according to claim 1, characterized in that: The installation of the inspection door (7) is as follows: 1) Design two horizontal keels (6) on the front steel frame (4) and prepare an inspection door (7) leaf that meets the spacing of the two horizontal keels (6); 2) Install hinges (8) and square steel tubes (9) on the axial side of the door leaf; 3) Embed the square steel tubes (9) between the two horizontal keels (6) and install the adjustment layer (10) in the gap between the square steel tubes (9) and the vertical keel (402); 4) Fix the door by passing through the vertical keel (402), adjustment layer (10), horizontal keel (6) and square steel tube (9) with nails.

Images