CN114541486B - Construction method for reconstructing anti-floating layer of waterproof bottom plate of existing building - Google Patents
Construction method for reconstructing anti-floating layer of waterproof bottom plate of existing building Download PDFInfo
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- CN114541486B CN114541486B CN202210197872.6A CN202210197872A CN114541486B CN 114541486 B CN114541486 B CN 114541486B CN 202210197872 A CN202210197872 A CN 202210197872A CN 114541486 B CN114541486 B CN 114541486B
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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Abstract
The invention relates to the technical field of anti-floating reconstruction design and construction of existing building waterproof bottom plates, in particular to a re-manufactured anti-floating layer of an existing building waterproof bottom plate and a construction method thereof. The method comprises the steps of reconstructing anti-floating layer thickness calculation; setting an anti-floating layer grouting pressure balance system; reconstructing a waterproof bottom plate and constructing an anti-floating layer; and (5) recovering the ground of the basement. The invention not only solves the key technical problems that the existing building waterproof bottom plate bulges, cracks, leaks and the like are difficult to cure caused by the fact that the groundwater exceeds the anti-floating waterproof level or the rainy period water level, but also has simple and easy construction operation, and the reconstruction cost is only 1/10 of the reworking repair cost. The method is suitable for reconstruction design and construction of the waterproof bottom plate of the existing building basement without ground water level fortification and with ground water level fortification.
Description
Technical Field
The invention provides a construction method for reconstructing an anti-floating layer of an existing building waterproof bottom plate, belongs to the technical field of anti-floating reconstruction design and construction of existing building waterproof bottom plates, and is suitable for reconstruction design and construction of anti-floating failure of an existing building waterproof bottom plate without ground water level fortification and ground water level fortification.
Background
According to the geological survey data in recent years, the groundwater level rises by 2-3 m, so that about 80% of the existing building basement waterproof bottom plates without groundwater level fortification and about 15% of the existing building basement waterproof bottom plates with groundwater level fortification rise, crack and leak, the basement waterproof function and the structural durability are seriously affected, and the method becomes a national key technical problem which is difficult to cure.
Chinese patent CN104863188A discloses a self-weight anti-floating construction method, which is only suitable for new construction, as shown in fig. 1, and only has a schematic diagram of drilling holes, inserting pipes and jet grouting around the foundation to form a vertical water-blocking body, but does not have a schematic diagram of densely distributing drilling holes, inserting pipes and jet grouting in the foundation pit, and cannot enable foundation soil to form an integral bottom plate through grouting. If drilling, inserting pipe and jet grouting are carried out in the foundation pit, the anti-floating cost is far greater than the design and construction cost according to the anti-floating technical standard of the building engineering.
If holes, insertion pipes and jet grouting are densely distributed in the foundation pit to form a cement soil integral bottom plate with the thickness of 250mm, the minimum anti-seepage thickness requirement that the thickness of an anti-floating concrete bottom plate in the anti-floating technical standard of building engineering is not smaller than 350mm cannot be met. Therefore, the pressure of the underground water easily breaks through the weak bottom cement soil water-proof body to permeate under the foundation to generate buoyancy, so that the soil under the foundation cannot play the anti-floating function.
Disclosure of Invention
In order to solve the technical problems, the invention aims to: the construction method for the re-manufacturing of the anti-floating layer of the waterproof bottom plate of the existing building is provided:
1) The technical problem that the thickness of the reconstructed anti-floating layer of the existing building waterproof bottom plate is difficult to calculate accurately is solved through calculating the thickness of the reconstructed anti-floating layer.
2) By arranging the anti-floating layer grouting pressure balance system, the technical problems of water-proof bottom plate bulge and cracking caused by high-pressure grouting of the reconstructed anti-floating layer are solved.
3) The construction of the reconstructed anti-floating layer of the waterproof bottom plate thoroughly eliminates residual water and air in foundation soil by arranging an exhaust pipe and intermittent grouting, and solves the technical problem of non-compaction of grouting of the reconstructed anti-floating layer.
4) The technical problems of re-leakage of the existing cracks of the waterproof bottom plate and combination of new and old concrete and cracks are solved by grouting the existing cracks of the waterproof bottom plate, scraping cement-based permeable crystallization waterproof paint on the surface, and recovering the ground of the basement by adopting compensating shrinkage concrete.
The construction method for the re-manufacturing of the anti-floating layer of the waterproof bottom plate of the existing building comprises the following steps:
1. thickness calculation of reconstructed anti-floating layer
1) The anti-floating total load of the waterproof bottom plate is calculated according to the following formula: q=γ G1 h 1 ；
Wherein: q-waterproof floor anti-floating total load (kN/m) 2 )；
γ G1 Concrete volume weight, 25 (kN/m) 3 )；
h 1 -the total thickness (m) of the waterproof floor;
2) The water buoyancy load is calculated according to the following formula: w=γ s h；
Wherein: w-Water buoyancy load (kN/m) 2 )；
γ s The water volume weight is 10 (kN/m) 3 )；
h, the height (m) of the highest historical water level exceeding the bottom surface of the cushion layer;
3) The reconstructed anti-floating layer thickness is calculated as follows: h is a 2 ＝(w-q)/γ G2
Wherein: h is a 2 -recreating the anti-floating layer thickness (m);
w-Water buoyancy load (kN/m) 2 )；
q-waterproof floor anti-floating total load (kN/m) 2 )；
γ G2 The volume weight of the reconstructed anti-floating layer is 20 to 22 (kN/m) 3 )；
2. Reproduced anti-floating layer grouting hole arrangement
1) Ejecting a central line of a grouting hole on the ground of the basement, and drilling through a waterproof bottom plate by adopting a handheld water drill until the bottom of the reconstructed anti-floating layer is flat;
2) After cleaning grouting holes, installing grouting pipes in time, and draining the pressure water under the waterproof bottom plate to a municipal drainage pipe network;
3. grouting pressure balance system for building anti-floating layer
1) Determining the pole setting distance of a grouting pressure balance system according to the maximum grouting pressure, and avoiding the position line of the ejected pole setting of the grouting pipe;
2) An I-shaped steel beam is arranged on a vertical rod positioning line, a steel pipe vertical rod is arranged on the I-shaped steel beam in a centering way, an adjustable bracket is arranged at the upper part of the vertical rod, and a square steel pipe is arranged in the adjustable bracket to form a reconstructed anti-floating layer grouting pressure balance system;
4. construction of waterproof base plate reconstructed anti-floating layer
1) Removing concrete of empty and cracks on the ground of the basement, cleaning, and injecting the existing cracks of the waterproof bottom plate into the bi-component nano grouting liquid by adopting an intelligent grouting machine;
2) When the grouting liquid is solidified and no water leakage exists in the observed cracks, the intelligent grouting machine is adopted to perform pressure grouting on foundation soil below the waterproof bottom plate from the grouting pipe, air and moisture in the foundation soil are discharged from the exhaust pipe, and the grouting liquid fills the foundation soil to form a reconstructed anti-floating layer;
5. basement ground restoration
1) Scraping two cement-based permeable crystallization waterproof coatings on the surface of the waterproof bottom plate crack after grouting and sealing;
2) C30P6 compensating shrinkage concrete pouring is adopted to restore the ground of the basement, and a plastic film is covered to keep moisture and maintain for 14d;
wherein:
the total thickness of the waterproof bottom plate is the sum of the thicknesses of the cushion layer, the waterproof protective layer, the waterproof bottom plate and the basement ground concrete.
And step two, before the central line of the grouting hole is popped up on the ground of the basement, firstly, determining the position of the steel bar of the waterproof bottom plate by adopting a scanner so as to avoid the steel bar when the grouting hole is drilled.
Setting the longitudinal and transverse spacing of the grouting holes of the reconstructed anti-floating layer to be 1.5-2.0 m, and setting the depth of the grouting holes to be 50-100 mm below the bottom level of the reconstructed anti-floating layer.
Step three, the maximum grouting pressure is 1.0 MPa-2.0 MPa; the vertical rod spacing of the grouting pressure balance system is 1.5 m-2.0 m; the I-shaped steel beam model meets the bearing capacity requirement of the reconstructed anti-floating layer grouting transfer pressure.
And thirdly, the vertical rod pressure of the grouting pressure balance system is resisted by the top plate of the basement and the soil covering, so that the safety of the top plate structure can be ensured.
And fourthly, performing pressure grouting on foundation soil under the waterproof bottom plate, namely uniformly expanding grouting from the middle part of the basement to the periphery, wherein one of two adjacent grouting pipes is a grouting pipe, and the other is an exhaust pipe.
And step four, the intelligent grouting machine automatically reduces grouting pressure when meeting a region with larger foundation soil porosity, and automatically increases grouting pressure when meeting a region with smaller foundation soil porosity, so that grouting liquid is evenly and fully filled in foundation soil pores to form a dense reconstructed anti-floating layer.
And fourthly, performing pressure grouting on foundation soil below the waterproof bottom plate by adopting an intermittent grouting method, grouting for half a day, dissipating the pore pressure of the foundation soil for half a day, removing residual water and air, and the like to finish the construction of the reconstructed anti-floating layer, so as to prevent the waterproof bottom plate from rising due to grouting pressure accumulation and enable the reconstructed anti-floating layer to meet the requirement of an anti-seepage function.
And step four, the function of the exhaust pipe is to exhaust water and air generated in the foundation soil grouting process, and then filling the filled foundation soil gaps by grouting liquid. And water discharged by the exhaust pipe is collected into the water collecting pit to be discharged, and grouting is stopped after the exhaust pipe overflows fully.
And fifthly, scraping and wiping two cement-based penetrating and crystallizing waterproof coatings on the surface of the crack of the waterproof bottom plate after grouting and sealing, namely scraping and wiping a first cement-based penetrating and crystallizing waterproof coating by adopting a special trowel, constructing a second time after the first cement-based penetrating and crystallizing waterproof coating is solidified, wherein the total thickness of the two scraping and wiping processes is 2-3 mm, and the scraping and wiping range covers 100-150 mm on two sides of the crack.
And fifthly, limiting expansion rate of the C30P6 compensated shrinkage concrete is 0.02% -0.03%, and the new and old concrete joint cracking is prevented.
Compared with the prior art, the invention has the following beneficial effects:
1) The existing building waterproof bottom plate reconstruction anti-floating layer is only about 1/10 of the reworking cost of the waterproof bottom plate anti-floating failure, and the manufacturing cost is low;
2) The waterproof bottom plate has durable reconstructed anti-floating layer structure, stable and reliable anti-floating and anti-seepage functions and no use and maintenance cost;
3) The reconstructed anti-floating layer grouting adopts a hand-held water drill to form holes, does not need drilling machine construction, is not limited by the net height of the basement, has strong technical adaptability and has general popularization and application values;
4) The construction is simple, the quality is reliable, and the construction of the waterproof bottom plate reconstructed anti-floating layer does not damage the structures of the waterproof bottom plate and the top plate.
5) In conclusion, the invention has a leading effect on the existing building waterproof bottom plate anti-floating repair technology, and obvious technological progress and economic benefit are obtained.
Drawings
FIG. 1 is a schematic view of construction of a reconstructed anti-floating layer of a waterproof bottom plate of an existing building;
in the figure: 1. reconstructing the anti-floating layer; 2. a cushion layer; 3. a waterproof protective layer; 4. a waterproof bottom plate; 5. basement floor; 6. grouting pipe; 7. reinforcing steel bars; 8. an I-beam; 9. a vertical rod; 10. an adjustable bracket; 11. square steel pipes; 12. a basement roof; 13. and (5) earthing.
Detailed Description
The invention is further described below with reference to examples.
Example 1
As shown in fig. 1, the construction method for reconstructing the anti-floating layer of the existing building waterproof bottom plate in the embodiment specifically comprises the following steps:
1. thickness calculation of reconstructed anti-floating layer 1
1) The anti-floating total load of the waterproof bottom plate 4 is calculated according to the following formula: q=γ G1 h 1 ；
Wherein: q-waterproof floor 4 anti-floating total load (kN/m) 2 )；
γ G1 Concrete volume weight, 25 (kN/m) 3 )；
h 1 -the total thickness (m) of the waterproof floor 4;
2) The water buoyancy load is calculated according to the following formula: w=γ s h；
Wherein: w-Water buoyancy load (kN/m) 2 )；
γ s The water volume weight is 10 (kN/m) 3 )；
h, the height (m) of the historic highest water level exceeding the bottom surface of the cushion layer 2;
3) The thickness of the reconstructed anti-floating layer 1 is calculated according to the following formula: h is a 2 ＝(w-q)/γ G2
Wherein: h is a 2 -reworking the thickness (m) of the anti-floating layer 1;
w-Water buoyancy load (kN/m) 2 )；
q-waterproof floor 4 anti-floating total load (kN/m) 2 )；
γ G2 1 volume weight of the reconstructed anti-floating layer, 20 to 22 (kN/m) 3 )；
2. Grouting hole arrangement for remanufactured anti-floating layer 1
1) And (3) ejecting the central line of the grouting hole on the ground 5 of the basement, and drilling through the waterproof bottom plate 4 by adopting a hand-held water drill until the reconstructed anti-floating layer 1 is flat.
2) And (5) after cleaning the grouting holes, installing the grouting pipe 6 in time, and draining the pressure water of the waterproof bottom plate 4 to the municipal drainage pipe network.
3. Grouting pressure balance system for building anti-floating layer
1) Determining the distance between vertical rods 9 of a grouting pressure balance system according to the maximum grouting pressure, and avoiding the grouting pipe 6 to pop up the vertical rod 9 positioning line;
2) An I-shaped steel beam 8 is arranged on a positioning line of the vertical rod 9, a steel pipe vertical rod 9 is arranged on the I-shaped steel beam 8 in a centering way, an adjustable bracket 10 is arranged at the upper part of the vertical rod 9, and a square steel pipe 11 is arranged in the adjustable bracket 10 to form a grouting pressure balance system of the reconstructed anti-floating layer 1;
4. construction of waterproof bottom plate 4 for reconstructing anti-floating layer 1
1) Removing concrete with empty and cracks on the basement floor 5, cleaning the concrete, and injecting the existing cracks of the waterproof bottom plate 4 into the bi-component nano grouting liquid by adopting an intelligent grouting machine;
2) When the grouting liquid is solidified and no water leakage exists in the observed cracks, the intelligent grouting machine is adopted to perform pressure grouting on foundation soil below the waterproof bottom plate 4 from the grouting pipe 6, air and moisture in the foundation soil are discharged from the exhaust pipe, and the grouting liquid fills the foundation soil to form the reconstructed anti-floating layer 1;
5. basement floor 5 restoration
1) Scraping two cement-based permeable crystallization type waterproof coatings on the surface of the crack of the waterproof bottom plate 4 after grouting and sealing;
2) Restoring the basement floor 5 by adopting C30P6 compensating shrinkage concrete pouring, and covering a plastic film to keep moisture and maintain for 14d;
wherein:
the total thickness of the waterproof bottom plate 4 in the first step is the sum of the concrete thickness of the cushion layer 2, the waterproof protective layer 3, the waterproof bottom plate 4 and the basement floor 5.
And step two, before the central line of the grouting hole is popped up on the basement floor 5, firstly, a scanner is adopted to determine the position of the steel bar 7 of the waterproof bottom plate 4 so as to avoid the steel bar 7 when the grouting hole is drilled.
Setting the longitudinal and transverse spacing of the grouting holes of the reconstructed anti-floating layer 1 to be 1.5-2.0 m, and setting the depth of the grouting holes to be 50-100 mm below the bottom level of the reconstructed anti-floating layer 1.
Step three, the maximum grouting pressure is 1.0 MPa-2.0 MPa; the interval between the vertical rods 9 of the grouting pressure balance system is 1.5 m-2.0 m; the type 8 of the I-shaped steel beam meets the bearing capacity requirement of grouting transmission pressure of the reconstructed anti-floating layer 1.
And thirdly, the pressure of the vertical rod 9 of the grouting pressure balance system is resisted by the basement roof 12 and the earthing 13, so that the roof structure safety can be ensured.
And fourthly, performing pressure grouting on foundation soil below the waterproof bottom plate 4, namely uniformly expanding grouting from the middle part of the basement to the periphery, wherein one of two adjacent grouting pipes 6 is a grouting pipe 6, and the other is an exhaust pipe.
And step four, the intelligent grouting machine automatically reduces grouting pressure when meeting a region with larger foundation soil porosity, and automatically increases grouting pressure when meeting a region with smaller foundation soil porosity, so that grouting liquid is evenly and fully filled in foundation soil pores to form a dense reconstructed anti-floating layer 1.
And fourthly, performing pressure grouting on foundation soil below the waterproof bottom plate 4 by adopting an intermittent grouting method, grouting for half a day, dissipating the capillary pore pressure of the foundation soil for half a day, removing residual water and air, and the like to finish the construction of the reconstructed anti-floating layer 1, so as to prevent the waterproof bottom plate 4 from rising due to grouting pressure accumulation and enable the reconstructed anti-floating layer 1 to meet the requirement of an anti-seepage function.
And step four, the function of the exhaust pipe is to exhaust water and air generated in the foundation soil grouting process, and then filling the filled foundation soil gaps by grouting liquid. And water discharged by the exhaust pipe is collected into the water collecting pit to be discharged, and grouting is stopped after the exhaust pipe overflows fully.
And fifthly, scraping and smearing two cement-based penetrating and crystallizing waterproof coatings on the surface of the crack of the waterproof bottom plate 4 after grouting and sealing, namely scraping and smearing a first cement-based penetrating and crystallizing waterproof coating by adopting a special trowel, constructing a second time after the first cement-based penetrating and crystallizing waterproof coating is solidified, wherein the total thickness of the two scraping and smearing is 2-3 mm, and the scraping and smearing range covers 100-150 mm on two sides of the crack.
And fifthly, limiting expansion rate of the C30P6 compensated shrinkage concrete is 0.02% -0.03%, and the new and old concrete joint cracking is prevented.
Claims (9)
1. The construction method for the re-manufacturing of the anti-floating layer of the waterproof bottom plate of the existing building is characterized by comprising the following steps of:
1. thickness calculation of reconstructed anti-floating layer
1) The anti-floating total load of the waterproof bottom plate is calculated according to the following formula: q=γ G1 h 1 ；
Wherein: q-water-proof bottom plate anti-floating total load kN/m 2 ；
γ G1 Concrete volume weight, 25kN/m 3 ；
h 1 -the total thickness m of the waterproof floor;
2) The water buoyancy load is calculated according to the following formula: w=γ s h；
Wherein: w-water buoyancy load kN/m 2 ；
γ s The water volume weight is 10kN/m 3 ；
h, the highest historical water level exceeds the height m of the bottom surface of the cushion layer;
3) The reconstructed anti-floating layer thickness is calculated as follows: h is a 2 ＝(w-q)/γ G2
Wherein: h is a 2 -reconstructing the anti-floating layer thickness m;
w-water buoyancy load kN/m 2 ；
q-water-proof bottom plate anti-floating total load kN/m 2 ；
γ G2 -reconstructing the volume weight of the anti-floating layer, taking 20-22 kN/m 3 ；
2. Reproduced anti-floating layer grouting hole arrangement
1) Ejecting a central line of a grouting hole on the ground of the basement, and drilling through a waterproof bottom plate by adopting a handheld water drill until the bottom of the reconstructed anti-floating layer is flat;
2) After cleaning grouting holes, installing grouting pipes in time, and draining the pressure water under the waterproof bottom plate to a municipal drainage pipe network;
3. grouting pressure balance system with anti-floating layer
1) Determining the pole setting distance of a grouting pressure balance system according to the maximum grouting pressure, and avoiding the position line of the ejected pole setting of the grouting pipe;
2) An I-shaped steel beam is arranged on a vertical rod positioning line, a steel pipe vertical rod is arranged on the I-shaped steel beam in a centering way, an adjustable bracket is arranged at the upper part of the vertical rod, and a square steel pipe is arranged in the adjustable bracket to form a reconstructed anti-floating layer grouting pressure balance system;
4. construction of waterproof base plate reconstructed anti-floating layer
1) Removing concrete of empty and cracks on the ground of the basement, cleaning, and injecting the existing cracks of the waterproof bottom plate into the bi-component nano grouting liquid by adopting an intelligent grouting machine;
2) When the grouting liquid is solidified and no water leakage exists in the observed cracks, the intelligent grouting machine is adopted to perform pressure grouting on foundation soil below the waterproof bottom plate from the grouting pipe, air and moisture in the foundation soil are discharged from the exhaust pipe, and the grouting liquid fills the foundation soil to form a reconstructed anti-floating layer;
5. basement ground restoration
1) Scraping two cement-based permeable crystallization waterproof coatings on the surface of the waterproof bottom plate crack after grouting and sealing;
2) C30P6 compensating shrinkage concrete pouring is adopted to restore the ground of the basement, and a plastic film is covered to keep moisture and maintain for 14d;
the total thickness of the waterproof bottom plate is the sum of the thicknesses of the cushion layer, the waterproof protective layer, the waterproof bottom plate and the basement ground concrete.
2. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: step two, before the central line of the grouting hole is popped up on the ground of the basement, firstly, determining the position of the steel bar of the waterproof bottom plate by adopting a scanner so as to avoid the steel bar when the grouting hole is drilled; setting the longitudinal and transverse spacing of the grouting holes of the reconstructed anti-floating layer to be 1.5-2.0 m, and setting the depth of the grouting holes to be 50-100 mm below the bottom level of the reconstructed anti-floating layer.
3. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: step three, the maximum grouting pressure is 1.0 MPa-2.0 MPa; the vertical rod spacing of the grouting pressure balance system is 1.5 m-2.0 m; the type of the I-shaped steel beam meets the bearing capacity requirement of the reconstructed anti-floating layer grouting transfer pressure; and thirdly, the vertical rod pressure of the grouting pressure balance system is resisted by the top plate of the basement and the soil covering, so that the safety of the top plate structure can be ensured.
4. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: and fourthly, performing pressure grouting on foundation soil under the waterproof bottom plate, namely uniformly expanding grouting from the middle part of the basement to the periphery, wherein one of two adjacent grouting pipes is a grouting pipe, and the other is an exhaust pipe.
5. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: and step four, the intelligent grouting machine automatically reduces grouting pressure when meeting a region with larger foundation soil porosity, and automatically increases grouting pressure when meeting a region with smaller foundation soil porosity, so that grouting liquid is evenly and fully filled in foundation soil pores to form a dense reconstructed anti-floating layer.
6. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: and fourthly, performing pressure grouting on foundation soil below the waterproof bottom plate by adopting an intermittent grouting method, grouting for half a day, dissipating the pore pressure of the foundation soil for half a day, removing residual water and air, and the like to finish the construction of the reconstructed anti-floating layer, so as to prevent the waterproof bottom plate from rising due to grouting pressure accumulation and enable the reconstructed anti-floating layer to meet the requirement of an anti-seepage function.
7. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: and step four, the function of the exhaust pipe is to discharge water and air generated in the foundation soil grouting process, then filling the foundation soil gaps with grouting liquid, collecting the water discharged by the exhaust pipe into a water collecting pit for discharging, and stopping grouting after the exhaust pipe overflows fully.
8. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: and fifthly, scraping and wiping two cement-based penetrating and crystallizing waterproof coatings on the surface of the crack of the waterproof bottom plate after grouting and sealing, namely scraping and wiping a first cement-based penetrating and crystallizing waterproof coating by adopting a special trowel, constructing a second time after the first cement-based penetrating and crystallizing waterproof coating is solidified, wherein the total thickness of the two scraping and wiping processes is 2-3 mm, and the scraping and wiping range covers 100-150 mm on two sides of the crack.
9. The construction method for the re-building anti-floating layer of the existing building waterproof bottom plate according to claim 1, which is characterized by comprising the following steps: and fifthly, limiting expansion rate of the C30P6 compensated shrinkage concrete is 0.02% -0.03%, and the new and old concrete joint cracking is prevented.
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| CN104452829B (en) * | 2014-11-18 | 2016-08-24 | 中大建设股份有限公司 | A kind of pile-raft foundation float Structure and construction method |
| CN106894585A (en) * | 2017-02-24 | 2017-06-27 | 河南天下无漏防水科技股份有限公司 | Reconstruction construction of waterproof layer technique |
| CN109281492A (en) * | 2018-09-30 | 2019-01-29 | 重庆市十八土鑫诚灌浆防水工程有限公司 | A kind of construction repaired for existing waterproof layer slip casting reconstruction |
| CN113175005B (en) * | 2021-04-29 | 2022-05-20 | 山东金城建设有限公司 | Anti-floating design and construction method for waterproof bottom plate of underground garage in rainstorm period |
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