CN115142482A - Later-stage anti-floating reinforcement treatment method for basement - Google Patents
Later-stage anti-floating reinforcement treatment method for basement Download PDFInfo
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- CN115142482A CN115142482A CN202210781494.6A CN202210781494A CN115142482A CN 115142482 A CN115142482 A CN 115142482A CN 202210781494 A CN202210781494 A CN 202210781494A CN 115142482 A CN115142482 A CN 115142482A
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- 238000007667 floating Methods 0.000 title claims abstract description 35
- 230000002787 reinforcement Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 26
- 239000010410 layer Substances 0.000 claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000004568 cement Substances 0.000 claims abstract description 29
- 238000010276 construction Methods 0.000 claims abstract description 28
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 20
- 238000011049 filling Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000011241 protective layer Substances 0.000 claims abstract description 14
- 238000003672 processing method Methods 0.000 claims abstract description 10
- 238000013461 design Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 239000011083 cement mortar Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract 1
- 239000011440 grout Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a later-stage anti-floating reinforcement processing method for a basement, which belongs to the technical field of construction engineering construction and comprises the following steps: firstly drilling an anchor rod hole, putting an anchor rod and a grouting pipe into the anchor rod hole, then injecting cement slurry into the grouting pipe to form a grouting material layer until the cement slurry is poured to the bottom of a cushion layer, carrying out watering maintenance after the cement slurry in the hole is finally solidified, carrying out an anti-pulling test to ensure that the axial tension borne by the anchor rod is greater than the design requirement, then sequentially filling a gravel layer, a waterproof daub layer and a micro-expansion concrete layer in the anchor rod hole from bottom to top until the gravel layer, the waterproof daub layer and the micro-expansion concrete layer are flushed with the upper surface of a water-resistant plate, then flatly laying a steel plate on the upper surface of the water-resistant plate, allowing the anchor rod to penetrate through the middle of the anchor rod, processing external threads on the top of the anchor rod, tightly pressing and fixing the steel plate on the water-resistant plate by adopting two nuts, and finally arranging a rigid protective layer on the upper surface of the water-resistant plate to cover the anchor rod and the steel plate. The anchor rod device has the advantages that the stability of the structure is guaranteed, and little top space is occupied.
Description
Technical Field
The invention relates to the technical field of constructional engineering construction, in particular to a later-stage anti-floating reinforcement treatment method for a basement.
Background
In the field of constructional engineering, due to the facts that the design level, the construction technical level and the standard limitation are investigated, and the unpredictable nature of the dynamic changes of surrounding landforms, hydrogeology and environments causes that the anti-buoyancy of the underground structure floor cannot meet the requirements after the structure construction or during the use period, the quality problems of floating, cracking, water seepage and the like of the structure are caused, the existing structure needs to be subjected to anti-floating reinforcement and related anti-seepage treatment to ensure the structure safety, and because the anti-floating anchor rod is additionally arranged after the structure is completed, the design requirements, the construction environment and the construction process of the traditional sequential construction are fundamentally different.
In the prior art, a scheme for reinforcing the bottom plate in the later stage to resist floating is provided, for example, CN202210242842.2 provides a construction method for a rear-supplement anti-floating anchor rod, which relates to the construction of a related rear-mounted anti-floating anchor rod, and the construction and construction process of the rear-mounted anti-floating anchor rod have certain limitations, for example, the waterproof treatment of the anchor rod has certain hidden trouble, the treatment scheme is not provided for the water-resistant plate outside the anchor rod, the top of the anchor rod is constructed by adopting a bent cap, so that the rigid layer at the top is too thick to meet the requirement of clearance use space, the construction process is complex, and the construction cost is high.
Disclosure of Invention
In order to overcome the defects of the existing anti-floating reinforcement method, the invention aims to solve the technical problems that: the later-stage anti-floating reinforcing treatment method for the basement is simple in process and stable in structure.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the later-stage anti-floating reinforcement treatment method for the basement comprises the following steps:
a. drilling equipment and filling materials are prepared according to the construction site conditions, and prefabricated components such as anchor rods, grouting pipes, steel plates, nuts and the like are manufactured;
b. determining the drilling position and depth, and then sequentially performing operations of drilling, pore-forming and hole cleaning by using drilling equipment to finish the construction of the anchor rod hole;
c. placing an anchor rod and a grouting pipe into an anchor rod hole, wherein a plurality of radial positioning devices are arranged on the anchor rod at intervals to ensure that the anchor rod is positioned in the middle of the anchor rod hole, and a plurality of grouting holes are arranged on the grouting pipe at intervals;
d. injecting cement slurry into the grouting pipe to form a grouting material layer until the cement slurry is poured to the bottom of the cushion layer, performing watering maintenance after the cement slurry in the hole is finally set, and performing an anti-pulling test to ensure that the axial tension force which can be borne by the anchor rod is greater than the design requirement;
e. filling a gravel layer, a waterproof daub layer and a micro-expansion concrete layer in the anchor rod hole from bottom to top in sequence until the upper surface of the waterproof board is flush;
f. flatly laying a steel plate on the upper surface of the water-resistant plate, allowing the anchor rod to penetrate through the middle of the water-resistant plate, machining external threads on the top of the anchor rod, and pressing and fixing the steel plate on the water-resistant plate by adopting two nuts;
g. and a rigid protective layer is arranged on the upper surface of the water-resistant plate to cover the anchor rod and the steel plate.
Further, during drilling, firstly, a water abrasive drill is adopted to drill an anchor rod opening on the water resisting plate, then a professional anchor rod drilling machine with small vibration load is selected to form a hole, high-pressure air generated by an air compressor is used for deslagging, and stable drilling is carried out for 1-2 minutes after the preset depth is reached.
Further, the stock includes at least two, and every stock all adopts the structural style of multistage structure concatenation, and many stocks adopt centrosymmetric's mode welded fastening on circular locating support, circular locating support includes a plurality ofly, and sets up along stock length direction interval.
Further, radial positioning device includes that many both ends become the locating lever of pi shape after buckling, and many locating levers use the stock axis to set up as central rotational symmetry to through the partial welding of buckling at its both ends on the periphery wall of stock.
Furthermore, the grouting pipe is welded on the circular positioning support, the inner diameter of the grouting pipe is not smaller than 20mm, the length of the grouting pipe is the same as that of the anchor rod, a group of grouting holes are drilled at intervals of 20-40cm, each group of grouting holes comprises at least 5 grouting holes, the grouting holes are arranged in a rotational symmetry mode by taking the axis of the grouting pipe as the center, and the hole diameter of each grouting hole is 4-6mm.
Further, during the cement slurry injection, the cement slurry water cement ratio is controlled to be 0.45-0.50, the grouting pressure is 0.5-0.8 MPa, the grouting is stopped after the slurry overflows from the orifice, and the secondary grouting is carried out after 20-30 minutes, so that the full and no-cavity slurry in the anchor rod hole is ensured.
Furthermore, the thickness of the gravel layer is not less than 80mm, 5-15mm graded stones are adopted for tight filling, the thickness of the waterproof daub layer is not less than 60mm, the lap joint of the waterproof daub layer and the cushion layer is not less than 20mm, the micro-expansion concrete layer is tightly filled by C35 micro-expansion concrete, and the thickness of the micro-expansion concrete layer is not less than 200mm.
Further, before filling the micro-expansion concrete layer, a water-expansion water stop strip is arranged at the edge of the top of the waterproof cement layer, a water-expansion water stop ring is sleeved on the anchor rod and the grouting pipe, and then the micro-expansion concrete layer is poured.
Further, before the rigid layer is arranged, the waterproof board is detected, and the non-penetrating crack with the width less than or equal to 0.2mm is sealed by filling the crack with epoxy resin or painting the surface of the crack; for non-penetrating cracks with the width larger than 0.2mm, trowelling by cement mortar or embedding and repairing by epoxy resin cement mortar after a V-shaped groove is formed; aiming at the penetrating crack with the width less than or equal to 0.2mm, the crack is sealed by adopting an epoxy resin injection method; aiming at the penetrating crack with the width larger than 0.2mm, the crack is sealed by adopting an epoxy resin pressure grouting method after a V-shaped groove is formed; and finally, uniformly spraying a 1.5-2mm capillary crystalline waterproof coating layer on the water-resistant plate by adopting a spraying machine.
Further, after the waterproof coating is coated for not less than 24 hours, a reinforcing mesh is laid, a rigid protective layer of C35 micro-expansion concrete with the thickness of 80-100mm is poured, the rigid protective layer is also used as a basement leveling layer, a water intercepting ditch is arranged along the retaining wall on the leveling layer, and the water intercepting ditch is connected to a nearby water collecting pit nearby.
The beneficial effects of the invention are: through set up the steel sheet at stock tip, adopt mechanical resistance to plucking to replace curved anchor atress, reduced upper portion rigid layer thickness, simplified construction process, optimize the reinforcement as whole system component with all the other engineering structures simultaneously when considering the waterproof durability requirement of handling of the weak position of rearmounted stock, avoided only considering local reinforcement to lead to the unstable potential safety hazard of structure.
Drawings
Fig. 1 is a schematic structural view of the anchor device of the present invention.
Fig. 2 is a top view of the anchor device of the present invention.
The figure is marked as 1, an anchor rod hole, 2, a grouting material layer, 3, a radial positioning device, 4, a grouting pipe, 5, a gravel layer, 6, a cushion layer, 7, a water-resistant plate, 8, a waterproof daub layer, 9, a water-swelling water-stop strip, 10, a water-swelling water-stop ring, 11, a micro-swelling concrete layer, 12, a permeable crystallization type waterproof paint layer, 13, a steel plate, 14, an anchor rod, 15, a nut, 16, a rigid protective layer, 17, a steel mesh and 18, and the circular positioning support.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides a later-stage anti-floating reinforcement processing method for a basement, which comprises the following steps:
a. drilling equipment and filling materials are prepared according to the construction site conditions, and prefabricated components such as an anchor rod 14, a grouting pipe 4, a steel plate 13, a nut 15 and the like are manufactured;
b. determining the drilling position and depth, and then sequentially performing operations of hole opening, hole forming and hole cleaning by using drilling equipment to complete the construction of the anchor rod hole 1;
c. putting an anchor rod 14 and a grouting pipe 4 into an anchor rod hole 1, wherein a plurality of radial positioning devices are arranged on the anchor rod 14 at intervals to ensure that the anchor rod 14 is positioned in the middle of the anchor rod hole 1, and a plurality of grouting holes are arranged on the grouting pipe 4 at intervals;
d. injecting cement slurry into the grouting pipe 4 to form a grouting material layer 2 until the cement slurry is poured to the bottom of the cushion layer 6, watering and maintaining after the cement slurry in the hole is finally set, and performing an anti-pulling test to ensure that the axial tension force which can be borne by the anchor rod 14 is greater than the design requirement;
e. filling a gravel layer 5, a waterproof cement layer 8 and a micro-expansion concrete layer 11 into the anchor rod hole 1 from bottom to top above the cushion layer 6 in sequence until the upper surface of the water-resistant plate 7 is flush;
f. flatly laying the steel plate 13 on the upper surface of the water-resistant plate 7, allowing the anchor rod 14 to penetrate through the middle part of the water-resistant plate, machining external threads on the top of the anchor rod 14, and pressing and fixing the steel plate 13 on the water-resistant plate 7 by adopting two nuts 15;
g. a rigid protective layer 16 is arranged on the upper surface of the water-resistant plate 7 to cover the anchor rods 14 and the steel plate.
As shown in fig. 1 and 2, the whole structure formed after construction can be called as a bolt device, wherein prefabricated components such as a bolt 14, a grouting pipe 4, a steel plate 13 and a nut 15 are selected according to the structural stress checking calculation. Because the length of the anchor rod 14 is generally larger than the clear height of the limited space, a mechanical connecting structure is adopted for splicing the sections and producing the anchor rod in a factory. The anti-floating reinforcement principle of the anchor rod device is as follows: utilize stock 14 and grout material layer 2 to fix stock 14 lower part and secret basis, stock 14 upper portion compresses tightly steel sheet 13 on the bed course 6 of original structure through two nut structures to improve the anti floating effect of bed course 6. The advantage of this structure is that both the stability of structure has been guaranteed, has only taken up few headspace again.
For the construction process, the following preferred solutions are provided in the present application.
Some preparation is also required before drilling. Firstly, construction precipitation, anchor rod and waterproof construction strictly control underground water, before construction, the underground water level is reduced to a position not lower than 500mm of the lower part of the anchor rod in advance, an anchor rod hole site advanced drilling device is selected, and the depth of the drilling device is not lower than 1000mm deeper than the designed depth; then, original structure finished product protection is well made, damage and pollution to an original structure body are possibly caused by the mechanical access of a drilling device and the like, related finished product protection is carried out before construction, all equipment and structures adopt plastic films to adhere double-sided adhesive tapes to prevent pollution, and the equipment and the structures enter a heavy machinery route and position to be protected by temporarily laying anti-pressing steel plates or wood plates; and finally, positioning and measuring the anchor rod hole, accurately measuring and measuring the main axis of the anti-floating anchor rod device to be set by adopting a total station, determining the position of the anchor rod hole according to the main axis, and marking, wherein the position of the anchor rod device conflicts with the finished equipment and structure and needs to be avoided.
When drilling, firstly, a water mill drill is adopted to drill an anchor rod open hole on the water-resistant plate 7, according to the design requirement, the anchor rod hole 1 is generally selected to be 150mm, then a professional anchor rod drilling machine with small vibration load is selected to be used for hole forming, the hole forming is drilled in a disturbance section below the water-resistant plate by adopting a phi 180 sleeve, in addition, the high-pressure air generated by an air compressor is utilized for deslagging, the stable drilling is carried out for 1-2 minutes after the preset depth is reached, the bottom end head is prevented from not reaching the designed anchoring diameter, and the subsequent grouting is ensured to be sufficient.
In order to ensure the tensile strength of the anchor rods 14, the anchor rods 14 comprise at least two anchor rods 14, each anchor rod 14 is in a structural form of splicing a multi-section structure, and a mechanical joint, such as a sleeve and welding form, is adopted in the middle of each anchor rod 14. A plurality of stock 14 adopt centrosymmetric mode welded fastening on circular locating support 18, circular locating support 18 includes a plurality ofly, and sets up along stock 14 length direction interval. The round positioning support 18 can enable a plurality of anchor rods 14 to be arranged at even intervals, so that accurate positioning is ensured, and uniform stress of the anchor rods 14 is ensured.
In order to make the cement paste completely wrap the anchor rod 14, the radial positioning device 3 needs to be arranged to make a certain gap exist between the anchor rod 14 and the inner wall of the anchor rod hole 1. For simplifying the structure, radial positioning device 3 that this application adopted includes the locating lever that becomes pi shape after many both ends are buckled, and many locating levers use stock 14 axis to set up as central rotational symmetry to buckle the part welding on stock 14's periphery wall through its both ends.
For the grouting pipe, in order to arrange conveniently, the grouting pipe 4 can be welded on the circular positioning bracket 18, so that a certain gap is reserved between the grouting pipe 4 and the hole wall, and the thickness of a cement mortar protective layer can be ensured during pouring. For convenient pouring, the inner diameter of the grouting pipe 4 is not less than 20mm, the length of the grouting pipe is the same as that of the anchor rod 14, a group of grouting holes are drilled at intervals of 20-40cm, each group of grouting holes comprises at least 5 grouting holes, the grouting holes are rotationally and symmetrically arranged by taking the axis of the grouting pipe 4 as a center, and the diameter of each grouting hole is 4-6mm.
For the grouting material layer 2, in order to improve the fluidity of cement grout, the water cement ratio of the cement grout is controlled to be 0.45-0.50, the grouting pressure is 0.5-0.8 MPa, grouting is stopped after the grout overflows from the orifice, and secondary grouting is carried out after 20-30 minutes to ensure that the grout in the anchor rod hole 1 is full and has no cavity. And meanwhile, the grouting depth is controlled, the anchor rod hole 1 cannot be directly filled with the hole opening, the anchor rod hole is poured to the lower surface of the cushion layer 6 according to design requirements, the grouting height is controlled through grouting amount control and measurement control in the pouring process, after cement slurry in the hole is finally set, watering maintenance can be properly carried out within 50cm away from the hole opening, and watering maintenance measures which are not less than 2 times per day are required to be taken within 2 days after the grouting device 2 is finished. The anchor rods 14 are subjected to a pre-basic test, and an anti-pulling force detection test is carried out 28 days after the construction and maintenance of the anchor rods 14 are finished, the number of the anchor rods 14 in an acceptance test is not less than 5% of the total number of the anchor rods, and is not less than 5, and the maximum test load is 1.5 times of the standard axial tension value of the anchor rods 14.
In order to avoid the groundwater from floating up after passing through the grouting material layer 2, waterproofing treatment needs to be carried out in the anchor rod hole 1 above the grouting material layer 2. Firstly, the thickness of the gravel layer 5 is not less than 80mm, 5-15mm graded stones are adopted for tight filling, and the gravel layer 5 can play a certain role in buffering underground water; then, the thickness of the waterproof daub layer 8 is not less than 60mm, the lap joint of the waterproof daub layer 8 and the cushion layer 6 is not less than 20mm, and the waterproof daub layer 8 can be smeared by adopting non-solidified rubber asphalt; the micro-expansion concrete layer 11 is used for compacting the gravel layer 5 and the waterproof cement layer 8, and can be compacted by pouring C35 micro-expansion concrete with the thickness not less than 200mm.
Further, before filling the micro-expansion concrete layer 11, a water-expansion water stop bar 9 is arranged at the edge of the top of the waterproof mortar layer 8, a water-expansion water stop ring 10 is sleeved on the anchor rod 14 and the grouting pipe 4, and then the micro-expansion concrete layer 11 is poured. The water-swelling water stop strip 9 and the water-swelling water stop ring 10 can block the gap between the grouting material layer 2 and the wall of the anchor rod hole and the gap between the anchor rod 14 and the grouting pipe 4 in the solidification process, so that the upper weak part of the anchor rod device is waterproofly reinforced. When the water-swelling water stop strip 9 and the water-swelling water stop ring 10 are installed, the end polishing round steel is adopted for pressing and tightening.
The original waterproof layer is damaged due to insufficient anti-floating and reinforcement treatment, so that waterproof reinforcement treatment is needed, structural cracks need to be checked before the waterproof layer is coated, and the cracks are filled with epoxy resin or the surface of the non-penetrating cracks with the width less than or equal to 0.2mm are coated and sealed; for non-penetrating cracks with the width larger than 0.2mm, trowelling by cement mortar or embedding and repairing by epoxy resin cement mortar after a V-shaped groove is formed; aiming at the penetrating crack with the width less than or equal to 0.2mm, the crack is sealed by adopting an epoxy resin injection method; aiming at the penetrating crack with the width larger than 0.2mm, a V-shaped groove is formed, and then the crack is sealed by adopting an epoxy resin pressure grouting method; and finally, uniformly spraying a 1.5-2mm permeable crystallization type waterproof coating layer 12 on the water-resistant plate by adopting a spraying machine.
After the waterproof paint is coated for not less than 24 hours, a steel bar mesh 17 is laid, a rigid protective layer 16 of C35 micro-expansion concrete with the thickness of 80-100mm is poured, the rigid protective layer 16 also serves as a basement leveling layer, a water intercepting ditch is arranged along the retaining wall on the leveling layer, and the water intercepting ditch is connected to a nearby water collecting pit nearby. The structural strength of the rigid protective layer 16 can be greatly improved by adding the reinforcing mesh 17, and then the anti-floating effect is improved. The drainage ditch and the water collecting pit are arranged to conveniently check condensed water or underground surface water which may be generated in the later period.
Claims (10)
1. The later-stage anti-floating reinforcement treatment method for the basement is characterized by comprising the following steps:
a. drilling equipment and filling materials are prepared according to the construction site conditions, and prefabricated components such as an anchor rod (14), a grouting pipe (4), a steel plate (13), a nut (15) and the like are manufactured;
b. determining the drilling position and depth, and then sequentially performing operations of tapping, pore-forming and hole cleaning by using drilling equipment to complete the construction of the anchor rod hole (1);
c. putting an anchor rod (14) and a grouting pipe (4) into an anchor rod hole (1), wherein a plurality of radial positioning devices (3) are arranged on the anchor rod (14) at intervals to ensure that the anchor rod (14) is positioned in the middle of the anchor rod hole (1), and a plurality of grouting holes are arranged on the grouting pipe (4) at intervals;
d. injecting cement slurry into the grouting pipe (4), filling the anchor rod hole (1) to form a grouting material layer (2) until the cement slurry is grouted to the bottom of the cushion layer (6), watering and maintaining after the cement slurry in the hole is finally set, and performing an anti-pulling test to ensure that the axial tension force which can be borne by the anchor rod (14) is greater than the design requirement;
e. sequentially filling a gravel layer (5), a waterproof cement layer (8) and a micro-expansion concrete layer (11) from bottom to top above a grouting material layer (2) in the anchor rod hole (1) until the upper surface of the water-resistant plate (7) is flush;
f. flatly laying the steel plate (13) on the upper surface of the water-resistant plate (7), allowing the anchor rod (14) to penetrate through the middle of the water-resistant plate, machining external threads on the top of the anchor rod (14), and pressing and fixing the steel plate (13) on the water-resistant plate (7) by adopting two nuts (15);
g. a rigid protective layer (16) is arranged on the upper surface of the water-resistant plate (7) to cover the anchor rods (14) and the steel plate (13).
2. The later-stage anti-floating reinforcement treatment method for the basement according to claim 1, which is characterized in that: when drilling, firstly, a water abrasive drill is adopted to drill an anchor rod opening on the water resistant plate (7), then a professional anchor rod drilling machine with small vibration load is selected to form a hole, high-pressure air generated by an air compressor is used for deslagging, and stable drilling is carried out for 1-2 minutes after the preset depth is reached.
3. The later-stage anti-floating reinforcement treatment method for the basement according to claim 1, which is characterized in that: stock (14) include two at least, and every stock (14) all adopt the structural style of multistage structure concatenation, and many stock (14) adopt centrosymmetric's mode welded fastening on circular locating support (18), circular locating support (18) include a plurality ofly, and set up along stock (14) length direction interval.
4. The later-stage anti-floating reinforcement treatment method for the basement according to claim 1, which is characterized in that: radial positioner (3) include many both ends and buckle the back locating lever that becomes pi shape, and many locating levers use stock (14) axis to set up as central rotational symmetry to buckle the part welding on the periphery wall of stock (14) through its both ends.
5. The later-stage anti-floating reinforcement treatment method for the basement according to claim 1, which is characterized in that: the grouting pipe (4) is welded on the circular positioning support (18), the inner diameter of the grouting pipe (4) is not smaller than 20mm, the length of the grouting pipe is the same as that of the anchor rod (14), a group of grouting holes are drilled at intervals of 20-40cm, each group of grouting holes comprises at least 5 grouting holes, the grouting holes are arranged in a rotational symmetry mode by taking the axis of the grouting pipe as the center, and the aperture of each grouting hole is 4-6mm.
6. The later anti-floating reinforcement processing method for the basement according to claim 1, wherein the later anti-floating reinforcement processing method comprises the following steps: when the cement is injected, the water-cement ratio of cement slurry is controlled to be 0.45-0.50, the grouting pressure is 0.5-0.8 MPa, the grouting is stopped after the slurry overflows from the orifice, and the secondary grouting is carried out after 20-30 minutes, so that the full and no-cavity slurry in the anchor rod hole (1) is ensured.
7. The later-stage anti-floating reinforcement treatment method for the basement according to claim 1, which is characterized in that: the thickness of the gravel layer (5) is not less than 80mm, 5-15mm graded stone is adopted for tight filling, the thickness of the waterproof daub layer (8) is not less than 60mm, the lap joint of the waterproof daub layer (8) and the cushion layer (6) is not less than 20mm, the micro-expansion concrete layer (11) is densely filled by C35 micro-expansion concrete, and the thickness is not less than 200mm.
8. The later stage anti-floating reinforcement processing method for the basement as claimed in claim 7, wherein the later stage anti-floating reinforcement processing method comprises the following steps: before filling the micro-expansion concrete layer (11), a water-expansion water stop strip (9) is arranged at the edge of the top of the waterproof cement layer (8), a water-expansion water stop ring (10) is sleeved on the anchor rod (14) and the grouting pipe (4), and then the micro-expansion concrete layer (11) is poured.
9. The later anti-floating reinforcement processing method for the basement according to claim 1, wherein the later anti-floating reinforcement processing method comprises the following steps: before the rigid protective layer (16) is arranged, the waterproof plate (7) is detected, and the gap is filled with epoxy resin or the surface is coated and sealed aiming at the non-penetrating crack with the width less than or equal to 0.2 mm; for non-penetrating cracks with the width larger than 0.2mm, trowelling by adopting cement mortar or embedding and repairing by adopting epoxy resin cement after a V-shaped groove is formed; aiming at the penetrating crack with the width less than or equal to 0.2mm, the crack is sealed by adopting an epoxy resin injection method; aiming at the penetrating crack with the width larger than 0.2mm, the crack is sealed by adopting an epoxy resin pressure grouting method after a V-shaped groove is formed; then thoroughly removing residual loose sundries on the water resistant plate (7), washing and cleaning, and finally uniformly spraying a 1.5-2mm permeable crystallization type waterproof coating layer (12) on the water resistant plate (7) by adopting a spraying machine.
10. The later stage anti-floating reinforcement processing method for the basement as claimed in claim 9, wherein the later stage anti-floating reinforcement processing method comprises the following steps: after the waterproof coating is coated for not less than 24 hours, a reinforcing mesh (17) is laid, a rigid protective layer (16) of C35 micro-expansion concrete with the thickness of 80-100mm is poured, the rigid protective layer (16) is also used as a basement leveling layer, a water intercepting ditch is arranged on the leveling layer along the retaining wall, and the water intercepting ditch is connected to a nearby water collecting pit nearby.
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