Construction method for multi-node anti-seepage treatment of unbonded prestressed anti-floating anchor rod

Abstract

The invention relates to the technical field of building waterproof construction, and discloses a construction method for multi-node anti-seepage treatment of an unbonded prestressed anti-floating anchor rod, which comprises the following steps: S1, constructing the unbonded prestressed anti-floating anchor rod; the method comprises the steps of foundation pit excavation, anchor rod hole site measurement and placement, follow-pipe drilling and hole forming to the designed depth, drill pulling and grouting, anchor rod anti-pulling rod piece imbedding, grouting, anti-pulling experiment detection and acceptance inspection, S2, bottom plate waterproof construction, S3, BW water swelling sealing strip embedding, S4, anchor rod end waterproof joint treatment and S5, external anti-leakage sealing. Through the construction technology of a waterproof rubber lantern ring, a sealing water stop strip, a polyurethane waterproof coating, a capillary crystalline waterproof coating, a sealing water stop strip and a concrete column pier, the problem that when an anti-floating anchor rod is used due to the fact that the underground water level is high or the self weight of a structure is insufficient in a project adjacent to the lake edge, the top and a bottom plate of the anchor rod are prone to leakage due to rising of the underground water level is solved. The probability of leakage of the top and the bottom plate of the anchor rod is greatly reduced, and the later leakage stopping cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building waterproof construction, in particular to a construction method for anti-leakage treatment of multi-nodes of non-bonded prestressed anti-floating anchor rods. Background Art

[0002] In the field of engineering construction, when the project is close to the lake, the groundwater level is often high due to the influence of the lake water. At the same time, in some specific cases, the deadweight of the structure may not be enough to resist the buoyancy of the groundwater. In this context, the use of anti-floating anchors becomes a necessary choice. Anti-floating anchors provide anti-buoyancy for the structure by anchoring in stable strata to ensure the stability of the building under the action of groundwater. However, in actual applications, the node parts of the anti-floating anchors are prone to leakage, which not only affects the normal use of the project, but may also threaten the safety of the structure. Therefore, it is necessary to carry out anti-leakage treatment on the anchors to ensure the quality of the project.

[0003] At present, the construction method for waterproofing and anti-leakage of anti-floating anchor nodes often adopts a node structure that combines asphalt waterproof grease, waterproof membrane and rubber water stop ring. Waterproofing is achieved by setting a groove mold, filling waterproof grease and setting a rubber water stop ring. However, this method still has a high probability of leakage, resulting in a significant increase in the subsequent plugging cost. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a construction method for multi-node anti-leakage treatment of unbonded prestressed anti-floating anchor rods, which solves the problems of high probability of leakage at the top and bottom plate of the anchor rods and greatly increased plugging costs in the later stage.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a construction method for multi-node anti-leakage treatment of unbonded prestressed anti-floating anchor, comprising the following steps: S1: construction of unbonded prestressed anti-floating anchor, foundation pit excavation - anchor hole position measurement and placement - follow-up pipe drilling to the designed depth - drilling and grouting - placing anchor tension rods - grouting - anti-pulling test detection - acceptance; S2: Baseboard waterproofing construction, first waterproof the base layer, then apply the penetrating crystallization waterproof coating, and after the penetrating crystallization waterproof coating solidifies, perform maintenance, then apply the additional layer and lay the self-adhesive waterproofing membrane, and then install the waterproof rubber ring, and complete the baseboard waterproofing construction treatment through the asphalt waterproofing paste; S3: Bury the BW water-swelling sealing strips. Set the BW water-swelling sealing strips along the height direction of the unbonded prestressed steel strands that pass through the bottom plate of the structure, and wrap the water-swelling sealing strips tightly around the steel strands before protecting them; S4: Waterproof node treatment at the end of the anchor rod. First, grooves are cut with the end of the anchor rod as the center. Then, multiple layers of polyurethane waterproof coating are applied. After the polyurethane waterproof coating solidifies, concrete penetrating crystalline waterproof coating is applied. Finally, BW water-expandable sealing strips are buried to complete the waterproof node treatment at the end of the anchor rod. S5: External anti-leakage sealing. After the water-expanding sealing water-stop strip is placed, a square formwork is set up around the anchor rod end as the center and concrete is poured.

[0006] Preferably, the base elevation of the foundation pit excavated in S1 is 300 mm above the ground level.

[0007] Preferably, the bottom plate waterproofing construction comprises the following steps: S201: Waterproofing of the base layer: clean the base layer and scrape the cracked areas, and make the internal and external corners into arcs of R=50mm according to the specifications; S202: Construction of penetrating crystallization waterproof coating: The coating dosage is controlled to be greater than 1.5 kg / m2, and two coats are applied. After the first coat is applied, the second coat is applied after watering. The initial setting time of the two coats is 1-2 hours. After the second coat of coating solidifies, the curing time is 72-80 hours. The curing includes watering curing more than 3 times. S203: Additional layer construction: The fillet radius of the base layer at the corners of the waterproof layer is 50mm, and the additional layer is pasted to 250mm. The additional waterproof layer at the anchor rod exceeds the waterproof coating by more than 200mm; S204: Laying self-adhesive waterproofing membrane: The construction is carried out by pasting method, and the overlap of the self-adhesive waterproofing membrane is formed by bonding the self-adhesive layer of the self-adhesive waterproofing membrane; S205: Installing the waterproof rubber ring: The waterproof rubber ring is placed in the center of the anchor rod, and the waterproof rubber ring is bonded to the first layer of coiled material by hot melting method; S206: Asphalt waterproofing paste construction: Use a brush to thoroughly remove the floating dust and use a scraper to apply the waterproofing paste until it fills the inside of the ring.

[0008] Preferably, the unbonded prestressed steel strands penetrating the bottom plate of the structure in S3 are provided with BW water-swellable sealing strips every 300 mm in height, and the winding height of the water-swellable sealing strips on the steel strands is ≥50 mm.

[0009] Preferably, the waterproof node treatment at the end of the anchor rod comprises the following steps: S401: Grooving: A square groove of 250*250mm in size with a depth of 30mm and a width of 20mm is chiseled around the end of the anchor rod, and the groove and internal area are cleaned; S402: Apply polyurethane waterproof coating: dilute the prepared coating with an appropriate amount of diluent, including 200# gasoline and xylene, apply the first thin layer with a thickness of 0.2-0.3mm for pre-treatment of the bottom layer, and apply twice after drying for 24 hours. After the previous layer of coating has dried for 24 hours, apply the next layer, and apply vertically between each layer; S403: After the polyurethane waterproof coating solidifies, apply concrete penetrating crystalline waterproof coating on the upper part, and evenly apply it on the base surface with a hard-bristle brush. The coating amount is 1-1.5 kg / m2. After one coat of coating is dry, apply the second coat of coating. Before applying the second coat of coating, the previous coat must be moistened with clean water, and the coating direction of the coating must be consistent with that of the previous coat. S404: Bury BW water-expandable sealing strips: After brushing the concrete penetrating crystalline waterproof coating, place the water-expandable sealing waterstop strips along the groove.

[0010] Preferably, the size of the square template in S5 is 300*300*200 mm.

[0011] The present invention provides a construction method for multi-node anti-leakage treatment of non-bonded prestressed anti-floating anchor rods. It has the following beneficial effects: 1. The present invention solves the problem of easy leakage of the top and bottom plate of the anchor rod due to rising groundwater level when the project is close to the lake, the groundwater level is high or the structure has insufficient deadweight, through the construction process of waterproof rubber sleeve, sealing water stop strip, polyurethane waterproof coating, penetrating crystallization waterproof coating, sealing water stop strip and concrete column pier, thereby greatly reducing the probability of leakage of the top and bottom plate of the anchor rod and reducing the cost of plugging leakage in the later stage.

[0012] 2. The present invention adopts a node structure combining waterproof membrane, waterproof rubber sleeve and asphalt waterproof grease. The large-area waterproof membrane is spliced ​​at the anchor rod, and a waterproof rubber sleeve is arranged along the anchor rod. The waterproof rubber sleeve is filled with asphalt waterproof grease, thereby increasing the anti-leakage ability at the node.

[0013] 3. The anchor rod end of the present invention adopts polyurethane waterproof coating, concrete penetrating crystalline waterproof coating, BW water-expandable sealing strip and external anti-leakage concrete closed column pier. The multi-layer measures ensure the anti-leakage effect and are easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a flow chart of a construction method for multi-node anti-leakage treatment of a non-bonded prestressed anti-floating anchor rod. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] Please see attached Figure 1 The embodiment of the present invention provides a construction method for multi-node anti-leakage treatment of unbonded prestressed anti-floating anchor rods, comprising the following steps: S1: Unbonded prestressed anti-floating anchor construction, foundation pit excavation - anchor hole position measurement and placement - follow-pipe drilling to the designed depth - drilling and grouting - placing anchor tension rods - grouting - anti-pullout test - acceptance; S2: Baseboard waterproofing construction, first waterproof the base layer, then apply the penetrating crystallization waterproof coating, and after the penetrating crystallization waterproof coating solidifies, perform maintenance, then apply the additional layer and lay the self-adhesive waterproofing membrane, and then install the waterproof rubber ring, and complete the baseboard waterproofing construction treatment through the asphalt waterproofing paste; S3: Bury the BW water-swelling sealing strips. Set the BW water-swelling sealing strips along the height direction of the unbonded prestressed steel strands that pass through the bottom plate of the structure, and wrap the water-swelling sealing strips tightly around the steel strands before protecting them; S4: Waterproof node treatment at the end of the anchor rod. First, grooves are cut with the end of the anchor rod as the center. Then, multiple layers of polyurethane waterproof coating are applied. After the polyurethane waterproof coating solidifies, concrete penetrating crystalline waterproof coating is applied. Finally, BW water-expandable sealing strips are buried to complete the waterproof node treatment at the end of the anchor rod. S5: External anti-leakage sealing. After the water-expanding sealing water-stop strip is placed, a square formwork is set up around the anchor rod end as the center and concrete is poured.

[0017] 300mm above the base elevation of the foundation pit excavation in S1 Specifically, reserving a height of 300 mm can provide sufficient operating space for subsequent anchor construction. When conducting anchor hole position measurement and placement, following pipe drilling, pulling out the drill and grouting, etc., construction personnel and equipment need a certain amount of space to carry out operations to avoid affecting construction efficiency and quality due to insufficient space.

[0018] The bottom plate waterproofing construction comprises the following steps: S201: Waterproofing of the base layer: clean the base layer and scrape the cracked areas, and make the internal and external corners into arcs of R=50mm according to the specifications; Specifically, remove debris, dust, oil, etc. on the surface of the base layer to provide a clean attachment surface for the waterproof material, repair cracks in the base layer, prevent moisture from penetrating into the base layer through the cracks, and thus affect the waterproof effect. Make the corners into arcs so that the waterproof material can better fit the base layer in these areas, avoiding hollows, wrinkles, etc., thereby improving the quality of the project.

[0019] S202: Construction of penetrating crystallization waterproof coating: The coating dosage is controlled to be greater than 1.5 kg / m2, and two coats are applied. After the first coat is applied, the second coat is applied after watering. The initial setting time of the two coats is 1-2 hours. After the second coat of coating solidifies, the curing time is 72-80 hours. The curing includes watering curing more than 3 times. Specifically, by applying the paint twice, a waterproof coating of a certain thickness can be formed, which effectively blocks the penetration of water, ensures the integrity and reliability of the waterproof coating, and greatly reduces the risk of water penetration. After the first coating, water is poured thoroughly so that the active ingredients in the penetrating crystallization waterproof coating can better react chemically with the moisture in the base layer to form water-insoluble crystals, which penetrate deeply into the base layer and block pores and tiny cracks. The maintenance after the second layer of paint solidifies can allow the paint to fully solidify, thereby improving the strength and durability of the coating.

[0020] S203: Additional layer construction: The fillet radius of the base layer at the corners of the waterproof layer is 50mm, and the additional layer is pasted to 250mm. The additional waterproof layer at the anchor rod exceeds the waterproof coating by more than 200mm; Specifically, making the base layer at the corners of the waterproof layer rounded can reduce stress concentration, so that the waterproof material can better fit the base layer at the corners, avoiding hollowing, wrinkles, etc., thereby improving the waterproof effect. At the same time, the additional layer is pasted at 250mm, which can increase the waterproof thickness and coverage of the corners, further enhancing the waterproof performance of this part. The anchor rod is a weak link in waterproofing and is prone to leakage. The waterproof additional layer exceeds the waterproof coating by more than 200mm, which can focus on protecting the area around the anchor rod, effectively preventing water from penetrating from the anchor rod, and thus improving the overall waterproof reliability.

[0021] S204: Laying self-adhesive waterproofing membrane: The construction is carried out by pasting method, and the overlap of the self-adhesive waterproofing membrane is formed by bonding the self-adhesive layer of the self-adhesive waterproofing membrane; Specifically, the pasting method is adopted for construction, so that the self-adhesive waterproof membrane can be tightly adhered to the base layer without leaving any gaps, which can effectively prevent moisture from penetrating from the gap between the membrane and the base layer, thereby improving the waterproof performance. The bonding of the self-adhesive layer simplifies the construction process, improves the construction efficiency, ensures that the connection between the membranes is tight and seamless, forms a continuous waterproof barrier, avoids leakage problems caused by loose overlaps, and improves the integrity of the entire waterproof system.

[0022] S205: Installing the waterproof rubber ring: The waterproof rubber ring is placed in the center of the anchor rod, and the waterproof rubber ring is bonded to the first layer of coiled material by hot melting method; Specifically, the waterproof rubber ring is placed centrally on the anchor rod. The rubber ring can play a sealing and buffering role, effectively preventing moisture from penetrating from the junction of the anchor rod and the waterproof layer, and the waterproof rubber ring is bonded to the first layer of roll material using a hot melt method to ensure that the ring and the roll material are tightly combined to prevent moisture from finding a penetration path around the anchor rod.

[0023] S206: Asphalt waterproofing paste construction: Use a brush to thoroughly remove the floating dust and use a scraper to apply the waterproofing paste until it fills the inside of the ring.

[0024] Specifically, using a brush to thoroughly remove the floating dust can remove loose impurities on the surface of the base layer and provide a clean bonding surface for the waterproof grease. The floating dust will affect the bonding force between the waterproof grease and the base layer, resulting in a decrease in the waterproof effect. By removing the floating dust, it is ensured that the waterproof grease can be firmly attached to the base layer. The waterproof rubber ring plays a key waterproof role in the anchor rod part, and filling the ring with waterproof grease can further fill the tiny gap between the ring and the anchor rod, forming a dense waterproof sealing layer, preventing moisture from penetrating from the junction of the ring and the anchor rod, and enhancing the waterproof effect.

[0025] In the S3, the unbonded prestressed steel strands that penetrate the bottom plate of the structure are provided with BW water-swellable sealing strips every 300 mm in height, and the winding height of the water-swellable sealing strips on the steel strands is ≥50 mm.

[0026] Specifically, the water-swellable sealing strip will expand rapidly when it comes into contact with water, filling the gap between the steel strand and the structural base plate, forming an effective sealing layer, preventing moisture from penetrating around the steel strand, and a sealing strip is arranged every 300 mm to form multiple waterproof barriers in the entire penetration part of the steel strand, thereby improving the reliability of waterproofing. The higher winding height can form a thicker sealing layer at the junction of the steel strand and the surrounding structure, ensuring that a reliable waterproof sealing effect can be provided under different water pressures and complex environmental conditions.

[0027] The waterproof node processing of the anchor rod end comprises the following steps: S401: Grooving: A square groove of 250*250mm in size with a depth of 30mm and a width of 20mm is chiseled around the end of the anchor rod, and the groove and internal area are cleaned; Specifically, the grooving can provide space for subsequent waterproofing and sealing materials, and perform more effective waterproofing and sealing treatment on the ends of the anchor rods. At the same time, it can better block the penetration path of moisture and improve the overall performance of the waterproofing system.

[0028] S402: Apply polyurethane waterproof coating: dilute the prepared coating with an appropriate amount of diluent, including 200# gasoline and xylene, apply the first thin layer with a thickness of 0.2-0.3mm for pre-treatment of the bottom layer, and apply twice after drying for 24 hours. After the previous layer of coating has dried for 24 hours, apply the next layer, and apply vertically between each layer; Specifically, the first thin layer of polyurethane waterproof coating can be used for pre-treatment of the base layer to fill the tiny pores and unevenness on the surface of the base layer, improve the flatness and smoothness of the base layer, and at the same time, the thin coating can make the coating better penetrate into the base layer. After drying for 24 hours, it is applied twice to increase the thickness and density of the coating. Multi-layer coating can form a more complete waterproof film, effectively preventing the penetration of water. Vertical coating between each layer can ensure the uniformity of the coating and coverage without dead corners, avoiding missing coating and weak links.

[0029] S403: After the polyurethane waterproof coating solidifies, apply concrete penetrating crystalline waterproof coating on the upper part, and evenly apply it on the base surface with a hard-bristle brush. The coating amount is 1-1.5 kg / m2. After one coat of coating is dry, apply the second coat of coating. Before applying the second coat of coating, the previous coat must be moistened with clean water, and the coating direction of the coating must be consistent with that of the previous coat. Specifically, by combining two different types of waterproof coatings, double waterproof protection can be provided for the base layer, so as to play a waterproof role at different levels and mechanisms and effectively prevent the penetration of water. The concrete penetrating crystalline waterproof coating penetrates into the concrete, reacts with the components in the concrete, generates crystals to plug the pores and cracks, and enhances the self-waterproofing ability of the concrete. The uniform coating can ensure the consistency of the waterproof performance and improve the overall waterproof effect. Before applying the second coat of coating, the previous coat of coating is moistened with clean water to make the two coats of coating better bonded, avoid stratification, and improve the integrity and stability of the coating.

[0030] S404: Bury BW water-expandable sealing strips: After brushing the concrete penetrating crystalline waterproof coating, place the water-expandable sealing waterstop strips along the groove.

[0031] Specifically, after applying the concrete penetrating crystalline waterproof coating, placing a water-swelling sealing waterstop strip along the groove can further enhance the waterproof sealing effect. The water-swelling sealing strip will expand rapidly when it comes into contact with water, filling the gaps in the groove and possible tiny gaps, and forming a tight waterproof barrier together with the waterproof coating to prevent water penetration, thereby improving the reliability of the waterproof performance.

[0032] The size of the square template in S5 is 300*300*200mm.

[0033] Specifically, the supporting formwork can fix the water-swelling sealing waterstop strip in a predetermined position to prevent it from shifting or deforming during the concrete pouring process, thereby ensuring that the concrete structure matches the surrounding building structure and facilitating subsequent construction and decoration.

[0034] Although 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 construction method for multi-node anti-leakage treatment of non-bonded prestressed anti-floating anchor, characterized in that: The following steps are involved: S1: Unbonded prestressed anti-floating anchor construction, foundation pit excavation - anchor hole position measurement and placement - follow-pipe drilling to the designed depth - drilling and grouting - placing anchor tension rods - grouting - anti-pullout test - acceptance; S2: Baseboard waterproofing construction, first waterproof the base layer, then apply the penetrating crystallization waterproof coating, and after the penetrating crystallization waterproof coating solidifies, perform maintenance, then apply the additional layer and lay the self-adhesive waterproofing membrane, and then install the waterproof rubber ring, and complete the baseboard waterproofing construction treatment through the asphalt waterproofing paste; S3: Bury the BW water-swelling sealing strips. Set the BW water-swelling sealing strips along the height direction of the unbonded prestressed steel strands that pass through the bottom plate of the structure, and wrap the water-swelling sealing strips tightly around the steel strands before protecting them; S4: Waterproof node treatment at the end of the anchor rod. First, grooves are cut with the end of the anchor rod as the center. Then, multiple layers of polyurethane waterproof coating are applied. After the polyurethane waterproof coating solidifies, concrete penetrating crystalline waterproof coating is applied. Finally, BW water-expandable sealing strips are buried to complete the waterproof node treatment at the end of the anchor rod. S5: External anti-leakage sealing. After the water-expanding sealing water-stop strip is placed, a square formwork is set up around the anchor rod end as the center and concrete is poured.

2. The construction method of a non-bonded prestressed anti-floating anchor multi-node anti-leakage treatment according to claim 1 is characterized in that: The base elevation of the foundation pit excavated in S1 is 300mm above the base elevation.

3. The construction method for anti-leakage treatment of multi-nodes of a non-bonded prestressed anti-floating anchor according to claim 1 is characterized in that: The bottom plate waterproofing construction comprises the following steps: S201: Waterproofing of the base layer: clean the base layer and scrape the cracked areas, and make the internal and external corners into arcs of R=50mm according to the specifications; S202: Construction of penetrating crystallization waterproof coating: The coating dosage is controlled to be greater than 1.5 kg / m2, and two coats are applied. After the first coat is applied, the second coat is applied after watering. The initial setting time of the two coats is 1-2 hours. After the second coat of coating solidifies, the curing time is 72-80 hours. The curing includes watering curing more than 3 times. S203: Additional layer construction: The fillet radius of the base layer at the corners of the waterproof layer is 50mm, and the additional layer is pasted to 250mm. The additional waterproof layer at the anchor rod exceeds the waterproof coating by more than 200mm; S204: Laying self-adhesive waterproofing membrane: The construction is carried out by pasting method, and the overlap of the self-adhesive waterproofing membrane is formed by bonding the self-adhesive layer of the self-adhesive waterproofing membrane; S205: Installing the waterproof rubber sleeve: The waterproof rubber sleeve is placed in the center of the anchor rod, and the waterproof rubber sleeve is bonded to the first layer of coiled material by hot melting; S206: Asphalt waterproofing paste construction: Use a brush to thoroughly remove the floating dust and use a scraper to apply the waterproofing paste until it fills the inside of the ring.

4. The construction method for anti-leakage treatment of multi-nodes of a non-bonded prestressed anti-floating anchor according to claim 1 is characterized in that: In the S3, the unbonded prestressed steel strands that penetrate the bottom plate of the structure are provided with BW water-swellable sealing strips every 300 mm in height, and the winding height of the water-swellable sealing strips on the steel strands is ≥50 mm.

5. The construction method for anti-leakage treatment of multi-nodes of non-bonded prestressed anti-floating anchor according to claim 1 is characterized in that: The anchor rod end waterproof node processing comprises the following steps: S401: Grooving: A square groove of 250*250mm in size with a depth of 30mm and a width of 20mm is chiseled around the end of the anchor rod, and the groove and internal area are cleaned; S402: Apply polyurethane waterproof coating: dilute the prepared coating with an appropriate amount of diluent, including 200# gasoline and xylene, apply the first thin layer with a thickness of 0.2-0.3mm for pre-treatment of the bottom layer, and apply twice after drying for 24 hours. After the previous layer of coating has dried for 24 hours, apply the next layer, and apply vertically between each layer; S403: After the polyurethane waterproof coating solidifies, apply concrete penetrating crystalline waterproof coating on the upper part, and evenly apply it on the base surface with a hard-bristle brush. The coating amount is 1-1.5 kg / m2. After one coat of coating is dry, apply the second coat of coating. Before applying the second coat of coating, the previous coat must be moistened with clean water, and the coating direction of the coating must be consistent with that of the previous coat. S404: Bury BW water-expandable sealing strips: After brushing the concrete penetrating crystalline waterproof coating, place the water-expandable sealing waterstop strips along the groove.

6. The construction method for anti-leakage treatment of multi-nodes of unbonded prestressed anti-floating anchor according to claim 1 is characterized in that: The size of the square template in S5 is 300*300*200mm.

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