Construction method of anti-seismic stair sliding support

Abstract

The invention belongs to the technical field of building structure construction, and particularly relates to a construction method of an anti-seismic stair sliding support, which comprises the following steps: S1, manufacturing a lower positioning kit and an upper limiting kit, mounting the lower positioning kit to the upper part of a stair support bridging piece through an anchoring steel bar, forming a pouring hole in the lower positioning kit, and mounting the upper limiting kit on the lower part of the stair support bridging piece; concrete of the stair support bridging piece is poured through the pouring hole; s2, a plurality of cylindrical rolling shafts are evenly and horizontally placed in the lower positioning sleeve piece; s3, a limiting baffle is installed at the bottom of the upper limiting sleeve piece, the upper limiting sleeve piece is placed above the lower positioning sleeve piece, and the position of the cylindrical rolling shaft is adjusted; s4, an external member limiting plate is arranged on the upper portion of the upper limiting external member, and concrete of the stair step is poured; and S5, a sliding space is formed among the lower positioning sleeve piece, the cylindrical rolling shaft and the upper limiting sleeve piece, and grease type lubricating sealing materials are injected into the sliding space through the injection hole. According to the sliding support, the stair and the building structure are movably connected, and the service life of the sliding support is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of building structure construction technology, specifically relating to a construction method for an earthquake-resistant staircase sliding support. Background Technology

[0002] A stair sliding support is a special type of support used in building structures to connect staircases to the main structure, which includes structural beams and floor slabs. Its core function is to allow the staircase to undergo a certain degree of horizontal displacement or rotation under temperature changes, concrete shrinkage and creep, or seismic action, preventing the staircase structure from cracking or being damaged due to excessive restraint, while ensuring the load-bearing capacity and safety of the staircase.

[0003] Currently, there are two commonly used construction techniques. One is to use two or one layer of PTFE (polytetrafluoroethylene) sheet material as a separation layer between the upper and lower concrete layers. Since PTFE sheet is an organic material, its service life after installation differs from that of the main building structure, making regular replacement impossible. Under the influence of high temperature, high pressure, and ultraviolet radiation, the PTFE sheet material will age to varying degrees, resulting in a limited service life. Simultaneously, due to the poor rigidity of the plastic sheet, it is prone to horizontal displacement and vertical misalignment during the pouring of the upper and lower concrete layers, affecting the sliding effect between the upper staircase and the lower load-bearing supports, beams, and rest platforms. Adhesion between the upper and lower concrete layers further reduces the sliding efficiency. The second technique involves filling the space between the two steel plates with lubricating materials such as graphite powder. However, in humid environments and when the steel plates corrode, the graphite powder gradually spills and is lost. During concrete pouring, the graphite powder adheres and solidifies due to the inflow of cement slurry, weakening the lubricating effect and gradually losing its sliding properties.

[0004] The high resistance and reduced sliding aging of sliding supports can lead to tearing and splitting damage in the concrete structures of the upper and lower floors, posing a significant structural safety hazard to the staircase. In the event of an earthquake, the buffering effect will completely fail, which can easily cause significant loss of life and property.

[0005] Neither of the aforementioned technologies can achieve the long-term goal of ensuring that staircases serve as vital escape routes in building structures during earthquakes. Furthermore, neither of these existing technologies can restore functionality; for example, repairing the supports would require the complete removal of the staircases, resulting in significant waste of engineering costs.

[0006] Chinese patent CN112962792A discloses a staircase sliding support device and construction method, belonging to the field of building construction technology. The invention includes a floor slab beam and a staircase slab, as well as a first support plate and a second support plate. A connector is fixedly installed on the first support plate, and the connector is welded and fixed to the reinforcing steel of the floor slab beam, maintaining a horizontal state. The second support plate is fixedly installed to the reinforcing steel of the staircase slab. A sliding mechanism for supporting the staircase slab is provided between the first and second support plates. In this patent, the sliding mechanism between the two support plates uses rolling elements, which can achieve a certain degree of buffering. However, the lack of effective protection on the top of the rolling elements can easily cause concrete to mix with the rolling elements, affecting the rolling effect. Furthermore, the polytetrafluoroethylene layer is prone to aging and other deterioration, reducing its service life. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a construction method for a seismic-resistant staircase sliding support, which uses a non-through cylindrical roller as a structural bearing layer to achieve effective buffering between the staircase and the building plane, reduce buffering resistance, achieve low resistance, and extend service life.

[0008] The technical solution adopted by this invention to solve its technical problem is: The construction method of the seismic-resistant staircase sliding support of the present invention includes the following steps: S1. Fabricate the lower positioning kit and the upper positioning kit. Install anchoring steel bars at the bottom of the lower positioning kit and the top of the upper positioning kit respectively. Install the lower positioning kit to the upper part of the stair support cantilever slab through the anchoring steel bars. Open a pouring hole inside the lower positioning kit and pour concrete for the stair support cantilever slab through the pouring hole. This method of first lowering the positioning kit and then pouring concrete through the pouring hole can timely expel the gas in the lower sealed space, effectively ensure the compactness of the lower concrete pouring, and make the concrete and the lower positioning kit tightly bonded, with uniform and reliable force transmission. S2. Place several cylindrical rollers evenly and horizontally inside the lower positioning kit. Leave a gap between the two ends of the cylindrical rollers and the two ends of the lower positioning kit, and also leave a gap between the cylindrical rollers. The cylindrical rollers are preferably arranged in four rows and four columns. In actual operation, they can be adjusted according to the width of the ladder section. S3. Install the limit baffle at the bottom of the upper limit kit, place the upper limit kit above the lower positioning kit, adjust the position of the cylindrical rollers, and place the limit baffles between the adjacent cylindrical rollers respectively. S4. Set a limit plate on the upper part of the upper limit kit, pour concrete for the stair treads. The limit plate is the boundary of the concrete pouring. After the concrete reaches the strength, remove and clean the concrete that exceeds the limit plate. S5, a sliding space is formed between the lower positioning kit, the cylindrical roller and the upper positioning kit. Several injection holes are opened on the outside of the lower positioning kit. After the construction paving on the right stair landing platform is completed, grease-based lubricating and sealing material is added into the sliding space through the injection holes and the injection holes are sealed.

[0009] in: In step S1, the lower positioning kit is fabricated by setting the bottom of the lower positioning kit as a base plate, opening a casting hole on the base plate, then installing a front sealing baffle on the side of the base plate near the end of the stair support cantilever plate, installing a rear sealing baffle on the side of the base plate opposite to the front sealing baffle, and installing end baffles at both ends of the base plate.

[0010] In step S1, the upper limit positioning kit is manufactured by setting a cover plate at the bottom of the upper limit positioning kit. Several limiting baffles are evenly spaced at the bottom of the cover plate. The long side of the limiting baffles is parallel to the long side of the rear sealing baffle. A kit limiting plate is set on the upper side of the cover plate, and the kit limiting plate is located above the rear sealing baffle.

[0011] The cover plate and the base plate have the same outer dimensions.

[0012] In step S1, the concrete is poured to the upper edge of the pouring hole plane, above the surface of the base slab, and several filling holes are provided on the front sealing plate. The concrete is poured to the upper edge of the pouring hole plane, above the surface of the base slab, ensuring that the concrete at the pouring hole position is higher than the concrete of the stair support cantilever slab. The fluid properties of the concrete create pressure on the lower concrete of the lower positioning kit, ensuring that the lower concrete does not detach from the lower positioning kit due to shrinkage after hardening. The locally convex structure formed after pouring creates a horizontal shear-resistant structure between the lower positioning kit and the stair support cantilever slab, ensuring that they do not separate due to sliding between the stair support cantilever slab and the stair treads during long-term use. The filling holes are provided so that the sliding structure of the staircase can be replenished with grease-based lubricating and sealing materials after an earthquake.

[0013] The height of the front sealing baffle, the height of the rear sealing baffle, and the diameter of the cylindrical roller are all consistent with the thickness of the building pavement, ensuring that the top surface of the cylindrical roller is higher than the top surface of the building pavement and that the bottom surface of the cover plate is in contact with the top surface of the cylindrical roller.

[0014] In step S3, the spacing between several limiting baffles is set in accordance with the diameter of the cylindrical roller. The height of the limiting baffle is less than the diameter of the cylindrical roller, ensuring that the upper positioning kit and the lower positioning kit do not directly contact each other. Rolling sliding is formed through the cylindrical roller, and the axis of the cylindrical roller is parallel to the long side of the limiting baffle.

[0015] In step S4, the outer surface of the kit's limiting plate is flush with the concrete pouring boundary.

[0016] In step S4, after the concrete is poured, the anchoring steel bars at the top of the upper limit device are placed inside the concrete.

[0017] The stair support cantilever slab and the stair landing platform are located on the same plane, and the bottom of the stair support cantilever slab and the stair landing platform is a concrete structural beam.

[0018] The beneficial effects of this invention are: This invention sets up sliding supports between the staircase and the building structure based on the structural support effect and actual construction usage. This enables a movable connection between the staircase and the building structure, reducing sliding resistance and increasing the service life of the sliding supports. This invention innovatively uses a lower positioning kit and an upper positioning kit, and utilizes a non-through cylindrical roller as a structural bearing layer to achieve low-resistance structural movement. In daily maintenance, it can also achieve various effects such as sealing and corrosion prevention by adding grease-based lubricating and sealing materials.

[0019] The cylindrical roller in this invention moves relative to the upper positioning kit and the lower positioning kit. The upper positioning kit can slide back and forth under the action of the cylindrical roller, effectively absorbing the impact force generated when the building structure deforms, thus achieving buffering. Injecting grease-based lubricating and sealing material into the sliding space can reduce the friction between the upper positioning kit, the lower positioning kit, and the cylindrical roller, further improving the buffering effect and increasing the service life of the sliding support. Regularly checking and replenishing the sliding space with grease-based lubricating and sealing material, as well as timely replenishing the grease-based lubricating and sealing material after the building structure deforms, can restore the sliding effect of the sliding support. For example, grease-based lubricating and sealing material can be added annually after a building staircase is put into operation or after a general earthquake through the filling hole.

[0020] This invention uses anchor steel bars to fix the lower positioning kit and the upper positioning kit to the support cantilever plate and the stair tread respectively, which improves the structural strength of the sliding support and avoids non-structural damage to the sliding support, thereby affecting the buffering effect of the sliding support. The lower positioning kit and the upper positioning kit are in movable contact, which improves the structural strength while ensuring the movable effect. When the building structure slides due to external forces, the upper positioning kit at the bottom of the stair tread is prone to displacement and deformation. Therefore, setting a limiting baffle above the upper positioning kit can increase the fixed area between the upper positioning kit and the stair tread, improve the bonding force between the two, and the limiting baffle can also prevent concrete from pouring into the sliding space. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the positioning kit of the present invention; Figure 3 This is a schematic diagram of the positioning kit structure of the present invention; Figure 4 This is a schematic diagram of the planar structure of the positioning kit of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the upper limit kit of the present invention; Figure 6 This is a schematic diagram of the upper limit device structure of the present invention; Figure 7 This is a schematic diagram of the planar structure of the upper limit device kit of the present invention; Figure 8 This is a planar schematic diagram of the sliding support of the present invention in use; In the diagram: 1. Support plate; 2. Lower positioning kit; 3. Anchoring reinforcement; 4. Cylindrical roller; 5. Upper limit kit; 6. Stair tread; 7. Platform; 8. Building paving; 9. Structural beam; 201. Base plate; 202. Front sealing baffle; 203. Rear sealing baffle; 204. End baffle; 205. Filling hole; 206. Pouring hole; 501. Cover plate; 502. Limiting baffle; 503. Kit limiting plate. Detailed Implementation

[0022] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0023] Example 1 like Figure 1-8 As shown, the construction method of the seismic-resistant staircase sliding support of the present invention includes the following steps: S1. The bottom of the lower positioning kit 2 is set as a base plate 201, and a casting hole 206 is opened on the base plate 201. Then, a front sealing baffle 202 is installed on the side of the base plate 201 near the end of the stair support cantilever plate 1. A rear sealing baffle 203 is installed on the side of the base plate 201 opposite to the front sealing baffle 202. End baffles 204 are installed at both ends of the base plate 201. The bottom of the upper positioning kit 5 is set as a cover plate 501. Several limiting baffles 502 are evenly arranged at intervals on the bottom of the cover plate 501. The long side of the limiting baffle 502 is parallel to the long side of the rear sealing baffle 203. A baffle is set on the upper side of the cover plate 501. A positioning plate 503 is placed above the rear sealing plate 203. The cover plate 501 has the same outer dimensions as the base plate 201. Anchor bars 3 are installed at the bottom of the lower positioning kit 2 and the top of the upper positioning kit 5. The lower positioning kit 2 is installed to the upper part of the stair support cantilever plate 1 through the anchor bars 3. A pouring hole 206 is opened inside the lower positioning kit 2. Concrete for the stair support cantilever plate 1 is poured through the pouring hole 206. The concrete is poured to the upper edge of the plane of the pouring hole 206, which is higher than the surface of the base plate 201. Several filling holes 205 are opened on the front sealing plate 202. S2. Place several cylindrical rollers 4 evenly and horizontally inside the lower positioning kit 2, leaving a gap between the two ends of the cylindrical rollers 4 and the two ends of the lower positioning kit 2, and also leaving a gap between the cylindrical rollers 4. S3. Install the limiting baffle 502 at the bottom of the upper limit positioning kit 5, place the upper limit positioning kit 5 above the lower positioning kit 2, adjust the position of the cylindrical roller 4, and place the limiting baffles 502 between adjacent cylindrical rollers 4 respectively; the spacing between the limiting baffles 502 is set in accordance with the diameter of the cylindrical roller 4, the height of the limiting baffle 502 is less than the diameter of the cylindrical roller 4, and the axis of the cylindrical roller 4 is parallel to the long side of the limiting baffle 502.

[0024] The height of the front sealing plate 202, the height of the rear sealing plate 203, and the diameter of the cylindrical roller 4 are all consistent with the thickness of the building pavement 8. The bottom surface of the cover plate 501 contacts the top of the cylindrical roller 4 to achieve the back-and-forth sliding of the upper limit kit 5. S4. Set a limit plate 503 on the upper part of the upper limit kit 5, pour concrete for the stair treads 6, and after pouring the concrete, the anchoring steel bar 3 at the top of the upper limit kit 5 is set inside the concrete; the limit plate 503 is the pouring boundary of the concrete. After the concrete reaches the required strength, the concrete exceeding the limit plate 503 is removed and cleaned; the outer surface of the limit plate 503 is flush with the pouring boundary of the concrete. S5, a sliding space is formed between the lower positioning kit 2, the cylindrical roller 4 and the upper positioning kit 5. Several filling holes 205 are opened on the outside of the lower positioning kit 2. After the construction paving 8 on the right stair rest platform 7 is completed, grease-based lubricating and sealing material is added into the sliding space through the filling holes 205 and the filling holes 205 are sealed. The stair support cantilever slab 1 and the stair landing platform 7 are located on the same plane, and the bottom of the stair support cantilever slab 1 and the stair landing platform 7 is a concrete structural beam 9.

Claims

1. A construction method of an anti-seismic stair sliding support, characterized by, The method comprises the following steps: S1, make the lower positioning set (2) and the upper limiting set (5), install anchor steel bars (3) on the bottom of the lower positioning set (2) and the top of the upper limiting set (5), respectively, install the lower positioning set (2) on the upper part of the stair support cantilever plate (1) through the anchor steel bars (3), open a pouring hole (206) in the lower positioning set (2), and pour concrete for the stair support cantilever plate (1) through the pouring hole (206); S2, place a plurality of cylindrical rollers (4) evenly and horizontally in the lower positioning set (2), and leave a gap between the two ends of the cylindrical rollers (4) and the two ends of the lower positioning set (2), and also leave a gap between the cylindrical rollers (4); S3, install a limiting baffle (502) on the bottom of the upper limiting set (5), place the upper limiting set (5) above the lower positioning set (2), adjust the position of the cylindrical rollers (4), and place the limiting baffles (502) between adjacent cylindrical rollers (4), respectively; S4, set a set limiting plate (503) on the upper part of the upper limiting set (5), pour concrete for the stair steps (6), the set limiting plate (503) is the pouring boundary of the concrete, and after the concrete reaches the strength, the concrete exceeding the set limiting plate (503) is removed and cleaned; S5, the lower positioning set (2), the cylindrical rollers (4) and the upper limiting set (5) form a sliding space, a plurality of filling holes (205) are formed on the outer side of the lower positioning set (2), after the construction of the building pavement (8) on the right side of the stair resting platform (7) is completed, grease type lubricating sealing material is filled into the sliding space through the filling holes (205), and the filling holes (205) are closed.

2. The construction method of the shock-absorbing type stair sliding support according to claim 1, characterized by, In step S1, the lower positioning set (2) is made, the bottom of the lower positioning set (2) is provided with a bottom plate (201), the pouring hole (206) is formed on the bottom plate (201), then the front sealing baffle (202) is installed on one side of the bottom plate (201) close to the end of the stair support cantilever plate (1), the rear sealing baffle (203) is installed on the side of the bottom plate (201) opposite to the front sealing baffle (202), and the end baffles (204) are installed at both ends of the bottom plate (201).

3. The construction method of the shock-absorbing type stair sliding support according to claim 2, characterized by, In step S1, the upper limiting set (5) is made, the bottom of the upper limiting set (5) is provided with a cover plate (501), a plurality of limiting baffles (502) are evenly arranged on the bottom of the cover plate (501), the long edges of the limiting baffles (502) are parallel to the long edges of the rear sealing baffle (203), the set limiting plate (503) is arranged on the upper side edge of the cover plate (501), and the set limiting plate (503) is located above the rear sealing baffle (203).

4. The construction method of the shock-resistant stair sliding support according to claim 3, characterized in that, The outer dimensions of the cover plate (501) and the bottom plate (201) are the same.

5. The construction method of the shock-absorbing type stair sliding support according to claim 2, characterized by, In step S1, the concrete is poured to the upper edge of the pouring hole (206) plane, higher than the surface of the bottom plate (201), and a plurality of filling holes (205) are formed on the front sealing baffle (202).

6. The construction method of the shock-absorbing type stair sliding support according to claim 3, characterized by, The height of the front sealing baffle (202), the height of the rear sealing baffle (203) and the diameter of the cylindrical roller (4) are the same as the thickness of the building pavement (8), and the bottom surface of the cover plate (501) is in contact with the top of the cylindrical roller (4).

7. The construction method of the shock-absorbing type stair sliding support according to claim 1, characterized by, The spacing between the several limiting baffle plates (502) in step S3 matches the diameter of the cylindrical roller shaft (4), the height of the limiting baffle plate (502) is less than the diameter of the cylindrical roller shaft (4), and the axis of the cylindrical roller shaft (4) is parallel to the long side of the limiting baffle plate (502).

8. The construction method of the shock-absorbing type stair sliding support according to claim 1, characterized by, In step S4, the outer surface of the set limiting plate (503) is flush with the pouring boundary of the concrete.

9. The construction method of the shock-absorbing type stair sliding support according to claim 1, characterized in that, After pouring the concrete in step S4, the anchoring steel bars (3) on the top of the upper limiting set (5) are arranged inside the concrete.

10. The construction method of the shock-absorbing type stair sliding support according to claim 1, characterized by, The stair support cantilever plate (1) and the stair rest platform (7) are located in the same plane, and the bottom of the stair support cantilever plate (1) and the stair rest platform (7) is a concrete structure beam (9).

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