WO2021004007A1 - Foundation reinforcement method for conventional building - Google Patents
Foundation reinforcement method for conventional building Download PDFInfo
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- WO2021004007A1 WO2021004007A1 PCT/CN2019/125490 CN2019125490W WO2021004007A1 WO 2021004007 A1 WO2021004007 A1 WO 2021004007A1 CN 2019125490 W CN2019125490 W CN 2019125490W WO 2021004007 A1 WO2021004007 A1 WO 2021004007A1
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- foundation
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- pile
- grouting
- equidistant
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000002787 reinforcement Effects 0.000 title claims abstract description 51
- 239000002689 soil Substances 0.000 claims abstract description 40
- 238000010276 construction Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims description 48
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 22
- 229910052791 calcium Inorganic materials 0.000 claims description 22
- 239000011575 calcium Substances 0.000 claims description 22
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 239000003245 coal Substances 0.000 claims description 22
- 229940037003 alum Drugs 0.000 claims description 20
- 229910052934 alunite Inorganic materials 0.000 claims description 16
- 239000010424 alunite Substances 0.000 claims description 16
- 239000011440 grout Substances 0.000 claims description 16
- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 14
- 239000004575 stone Substances 0.000 claims description 14
- 238000005728 strengthening Methods 0.000 claims description 14
- 230000009916 joint effect Effects 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 8
- 238000012876 topography Methods 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims 2
- 239000010410 layer Substances 0.000 abstract description 28
- 230000000694 effects Effects 0.000 abstract description 9
- 239000011229 interlayer Substances 0.000 abstract description 3
- 238000005056 compaction Methods 0.000 abstract description 2
- 238000009412 basement excavation Methods 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
- 230000008961 swelling Effects 0.000 description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
Definitions
- the invention relates to the technical field of building foundation reinforcement, in particular to a foundation reinforcement method for traditional buildings.
- the above methods cannot provide a large reaction force to the upper structure, and the foundation soil is loess, the foundation is a strip foundation or an independent foundation under a column, and the foundation of an existing building with a small number of layers is not easy to construct, or is not in design theory. It conforms to the characteristics of the original building structure and foundation and the problem of poor reinforcement effect.
- the present invention provides a foundation reinforcement method for traditional buildings, which has the advantages of better reinforcement effect on the building foundation, and solves the problem of poor reinforcement effect.
- a foundation reinforcement method for traditional buildings including construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expansive concrete include: phosphogypsum 70-75%, 6-8% of natural alunite, 5-8% of calcined coal gangue, 2-6% of alum mud, 3-17% of calcium sulfoaluminate expansion agent.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 71-75%, natural alunite 7-8%, calcined coal gangue 6-8%, alum mud 3-8%, sulfoaluminate Calcium swelling agent 3 ⁇ 13%.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 72-75%, natural alunite 6.5-8%, calcined coal gangue 5.5-8%, alum mud 5-6%, sulfoaluminate 3 ⁇ 11% of calcium swelling agent.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 73 to 75%, natural alunite 7 to 8%, calcined coal gangue 7 to 8%, alum mud 5 to 6%, sulfoaluminate 3 ⁇ 8% calcium swelling agent.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 73-75%, natural alunite 6.5-8%, calcined coal gangue 5.5-8%, alumina mud 4.5-6%, sulfoaluminate Calcium swelling agent 3 ⁇ 10.5%.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 70-73%, natural alunite 6-7%, calcined coal gangue 5-7%, alumina mud 2-5%, sulfoaluminate Calcium swelling agent 8-17%.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 70-73%, natural alunite 6-6.5%, calcined coal gangue 5-7%, alum mud 2-4.5%, sulfoaluminate Calcium swelling agent 9-17%.
- the expansive concrete includes the following raw materials in parts by weight: phosphogypsum 70-71%, natural alunite 6-6.5%, calcined coal gangue 5-5.5%, alum mud 2-3%, sulfoaluminate Calcium swelling agent 14-17%.
- the present invention provides a foundation reinforcement method for traditional buildings, which has the following beneficial effects:
- the foundation reinforcement method used in traditional buildings by setting up holding piles, directly using mechanical holes or manual digging holes on the pile position, placing steel bars and pouring concrete in the holes, which is not restricted by ground changes and does not need to be connected.
- the piles and cut piles have strong adaptability, relatively stable stress, compression and pull resistance, low vibration, low noise, etc. Because they have no negative effects of soil squeezing, they can also pass through various hard interlayers, rock-socketed and The ability to enter various hard-bearing layers, the geometric size of the pile and the bearing capacity of a single pile have a large adjustable space, so that the effect of strengthening the building foundation is better.
- the foundation reinforcement method used in traditional buildings By laying a cushion between the top of the pile and the foundation of the existing building, the modulus of the pile is much larger than that of the soil, and the pile is less deformed than the soil.
- the cushion can make the pile Piercing upwards, along with this change process, the cushion layer material is constantly added to the soil between the piles, so as to ensure that a part of the load acts on the soil between the piles through the cushion layer, realizing the joint effect of the pile and the soil.
- a method for strengthening the foundation of traditional buildings which is characterized in that it comprises the following construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expansive concrete include: phosphogypsum 70%, natural alum Stone 6%, calcined coal gangue 5%, alumina mud 2%, calcium sulfoaluminate expansion agent 17%.
- a method for strengthening the foundation of traditional buildings which is characterized in that it comprises the following construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expansive concrete include: phosphogypsum 75%, natural alum Stone 8%, calcined coal gangue 8%, alum mud 6%, calcium sulfoaluminate expansion agent 3%.
- a method for strengthening the foundation of traditional buildings which is characterized in that it comprises the following construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expanded concrete include: phosphogypsum 72%, natural alum Stone 7%, calcined coal gangue 6%, alumina mud 5%, calcium sulfoaluminate expansion agent 10%.
- a method for strengthening the foundation of traditional buildings which is characterized in that it comprises the following construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single, etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expansive concrete include: phosphogypsum 71%, natural alum Stone 7%, calcined coal gangue 3%, alumina mud 6%, calcium sulfoaluminate expansion agent 13%.
- a method for strengthening the foundation of traditional buildings which is characterized in that it comprises the following construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single, etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expanded concrete include: phosphogypsum 72%, natural alum Stone 7%, calcined coal gangue 6%, alumina mud 5%, calcium sulfoaluminate expansion agent 10%.
- Embodiment 6 is a diagrammatic representation of Embodiment 6
- a method for strengthening the foundation of traditional buildings which is characterized in that it comprises the following construction steps:
- the reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings
- the focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors.
- joint actions should be considered for the superstructure, foundation and foundation.
- Set-up According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.
- Digging pile holes and inserting pipes dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.
- Pressure pouring pile body pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d ⁇ 3.0, the slope a/h1 of the side of the expanded bottom end is 1/3 ⁇ 1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D ⁇ 0.15D; start to use expansive concrete 1.5 ⁇ 3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once.
- the components of the expansive concrete include: phosphogypsum 73%, natural alum Stone 7%, calcined coal gangue 6%, alumina mud 3%, calcium sulfoaluminate expansion agent 11%.
- the foundation reinforcement method used in traditional buildings is not restricted by changes in the ground, by setting up holding piles, making holes mechanically or manually digging holes directly on the pile position, placing steel bars and pouring concrete in the holes, There is no need to connect and cut piles. It has strong adaptability, relatively stable stress, compression resistance and pull resistance, low vibration and low noise. Because it has no negative effects of soil squeezing, it also has the ability to pass through various hard interlayers, The ability of rock-socketing and entering various hard-bearing layers, the geometric size of the pile and the bearing capacity of a single pile have a large adjustable space, so that the effect of strengthening the building foundation is better.
- the modulus of the pile is much larger than that of the soil, and the pile is less deformed than the soil.
- the cushion can make the pile penetrate upwards.
- the cushion material is constantly added to the soil between the piles to ensure Part of the load acts on the soil between the piles through the cushion layer, realizing the joint action of the pile and the soil.
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Abstract
Description
Claims (8)
- 一种用于传统建筑的地基加固方法,其特征在于,包括施工步骤:A method for strengthening the foundation of traditional buildings, which is characterized in that it comprises the following construction steps:1)、材料收集:加固工程人员先进行材料收集详细的工程质量、水文地质和基础设计资料,按结构类型,负载的大小和使用要求的问题,结合地形地貌,土壤结构,环境和毗邻的建筑物和其他因素的影响,地基处理方案的重点是初步选定审议,此外,地基加固处理方案的选择上,应该考虑采取联合行动上层建筑、地基与基础。1). Material collection: The reinforcement engineers first collect detailed engineering quality, hydrogeology and basic design data, according to the structure type, load size and use requirements, combined with topography, soil structure, environment and adjacent buildings The focus of the foundation treatment plan is the preliminary selection and consideration due to the influence of objects and other factors. In addition, in the selection of the foundation reinforcement treatment plan, joint actions should be considered for the superstructure, foundation and foundation.2)、分析和选择:对地基进行钻孔排查,查明地基土坚硬层深度、地基软弱情况及地基土中含水量情况,根据建筑物的荷载、现有地基承载力值,确定地基加固所需要增大的承载力,从而确定需要钻孔深度、钻孔间距、注浆量等指标。2) Analysis and selection: conduct drilling and inspection of the foundation, find out the depth of the hard layer of the foundation soil, the softness of the foundation and the moisture content of the foundation soil, and determine the foundation reinforcement site according to the load of the building and the existing foundation bearing capacity. Need to increase the bearing capacity to determine the required drilling depth, drilling spacing, grouting volume and other indicators.3)、确定施工参数:确定加固所需桩的根数、尺寸和位置。3) Determine the construction parameters: determine the number, size and location of the piles required for reinforcement.4)、放线:根据多个单管同步注浆的设计要求,确定单个等距离的三孔和两排之间等距离的三孔形成抱桩的注浆孔的钻孔位置,或单个等距离的四孔和两排之间等距离的四孔形成抱桩的注浆孔的钻孔位置。4). Set-up: According to the design requirements of multiple single pipes for simultaneous grouting, determine the drilling position of a single equidistant three holes and three equidistant holes between two rows to form the grouting holes for holding piles, or a single etc. The four holes of the distance and the four holes of equal distance between the two rows form the drilling positions of the grouting holes for holding the pile.5)、挖桩孔以及插管:挖施工槽,并根据所确定的施工参数人工挖孔形成桩孔,钻孔后要保持孔畅通,起杆后立即下管,先下一个DN32管,根据基础埋深及地基情况,DN32管在基础埋深3~4米以下范围内做成花管,花管做法:每150mm布置一层出浆孔,每层均匀分布6个孔径为6mm的出浆孔,最后在DN32管内下一根DN20管,DN20管底部2~5米范围内做成花管。5) Digging pile holes and inserting pipes: dig construction trenches, and manually dig holes to form pile holes according to the determined construction parameters. After drilling, keep the holes unblocked, and immediately lower the pipe after lifting the pole. The next DN32 pipe is based on The buried depth of the foundation and the condition of the foundation, the DN32 pipe is made into a flower tube within the range of the buried depth of the foundation 3 to 4 meters. The method of the flower tube: arrange one layer of grout holes every 150mm, and evenly distribute 6 grout holes with a diameter of 6mm on each layer Finally, a DN20 tube is placed in the DN32 tube, and the bottom of the DN20 tube is made into a flower tube within 2 to 5 meters.6)、封口:孔口据地面2~4米范围内填充干水泥,将孔口封严。6) Sealing: Fill the hole with dry cement within 2 to 4 meters of the ground, and seal the hole tightly.7)、压力浇注桩体:向挖好的桩孔中边抛入石块边倒入混凝土,并且在桩端1.5~2m处桩体扩大截面,其扩底端直径与桩身直径比D/d≤3.0,扩底端侧面的斜率a/h1为1/3~1/2,扩底端侧面斜坡矢高h2为0.10D~0.15D;在距离建筑物基础底1.5~3m处开始用膨胀混凝土浇筑,压力注浆时三个等距离的孔或四个等距离的孔同步注浆,并采用退管注浆法,即每孔注浆时分批次注入,注入25%时,退管一次,继续注入25%,再退管一次,依次类推,直至注浆完成,利用压力注浆的串浆原理,使其单个等距离的三孔或两排之间等距离的三孔串浆交错连接,形成一个抱桩,使其单个等距离的四孔或两排之间等距离的四孔串浆交错连接,形成一个抱桩,所述膨胀混凝土的组分,包括:磷石膏70~75%、天然明矾石6~8%、煅烧煤矸石5~8%、矾泥2~6%、硫铝酸钙类膨胀剂3~17%。7) Pressure pouring pile body: pour concrete while throwing stones into the dug pile hole, and expand the section of the pile body at 1.5-2m from the pile end, and the ratio of the diameter of the enlarged bottom end to the pile body diameter is D/ d≤3.0, the slope a/h1 of the side of the expanded bottom end is 1/3~1/2, the height of the slope of the side of the expanded bottom end h2 is 0.10D~0.15D; start to use expansive concrete 1.5~3m away from the base of the building During pouring and pressure grouting, three equidistant holes or four equidistant holes are simultaneously grouted, and the pipe withdrawal grouting method is adopted, that is, each hole is injected in batches during grouting, and when 25% is injected, the pipe is withdrawn once. Continue to inject 25%, then withdraw the pipe one more time, and so on, until the grouting is completed, use the principle of pressure grouting to make a single equidistant three holes or three equidistant holes between two rows of interlaced connection. A holding pile is formed, so that a single equidistant four holes or four equidistant four holes between two rows are connected in series to form a holding pile. The components of the expansive concrete include: phosphogypsum 70-75%, 6-8% of natural alunite, 5-8% of calcined coal gangue, 2-6% of alum mud, 3-17% of calcium sulfoaluminate expansion agent.8)、铺设褥垫层:在桩顶与既有建筑基础之间铺设250~400mm厚的褥垫层。8) Laying cushions: 250-400mm thick cushions are laid between the pile top and the existing building foundation.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏71~75%、天然明矾石7~8%、煅烧煤矸石6~8%、矾泥3~6%、硫铝酸钙类膨胀剂3~13%。The method for strengthening the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 71-75%, natural alunite 7-8% , Calcined coal gangue 6-8%, alum mud 3-6%, calcium sulfoaluminate expansion agent 3-13%.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏72~75%、天然明矾石6.5~8%、煅烧煤矸石5.5~8%、矾泥5~6%、硫铝酸钙类膨胀剂3~11%。The method for strengthening the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 72-75%, natural alunite 6.5-8% , Calcined coal gangue 5.5 to 8%, alum mud 5 to 6%, calcium sulfoaluminate expansion agent 3 to 11%.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏73~75%、天然明矾石7~8%、煅烧煤矸石7~8%、矾泥5~6%、硫铝酸钙类膨胀剂3~8%。The method for strengthening the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 73-75%, natural alunite 7-8% , Calcined coal gangue 7-8%, alum mud 5-6%, calcium sulfoaluminate expansion agent 3-8%.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏73~75%、天然明矾石6.5~8%、煅烧煤矸石5.5~8%、矾泥4.5~6%、硫铝酸钙类膨胀剂3~10.5%。The method for reinforcing the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 73-75%, natural alunite 6.5-8% , Calcined coal gangue 5.5-8%, alumina mud 4.5-6%, calcium sulfoaluminate expansion agent 3-10.5%.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏70~73%、天然明矾石6~7%、煅烧煤矸石5~7%、矾泥2~5%、硫铝酸钙类膨胀剂8~17%。The method for strengthening the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 70-73%, natural alunite 6-7% , Calcined coal gangue 5~7%, alum mud 2~5%, calcium sulfoaluminate expansion agent 8~17%.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏70~73%、天然明矾石6~6.5%、煅烧煤矸石5~7%、矾泥2~4.5%、硫铝酸钙类膨胀剂9~17%。The method for reinforcing the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 70-73%, natural alunite 6-6.5% , Calcined coal gangue 5~7%, alum mud 2~4.5%, calcium sulfoaluminate expansion agent 9~17%.
- 根据权利要求1所述的一种用于传统建筑的地基加固方法,其特征在于,所述膨胀混凝土包括以下重量份数配比的原料:磷石膏70~71%、天然明矾石6~6.5%、煅烧煤矸石5~5.5%、矾泥2~3%、硫铝酸钙类膨胀剂14~17%。The method for strengthening the foundation of traditional buildings according to claim 1, wherein the expansive concrete comprises the following raw materials in parts by weight: phosphogypsum 70-71%, natural alunite 6-6.5% , Calcined coal gangue 5 ~ 5.5%, alum mud 2 ~ 3%, calcium sulfoaluminate expansion agent 14 ~ 17%.
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