CN113389190A - Rapid treatment method for plate bottom void of narrow area of red viscous soil factory - Google Patents
Rapid treatment method for plate bottom void of narrow area of red viscous soil factory Download PDFInfo
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- CN113389190A CN113389190A CN202110700333.5A CN202110700333A CN113389190A CN 113389190 A CN113389190 A CN 113389190A CN 202110700333 A CN202110700333 A CN 202110700333A CN 113389190 A CN113389190 A CN 113389190A
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- Prior art keywords
- grouting
- holes
- hole
- void
- concrete
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/16—Restraining of underground water by damming or interrupting the passage of underground water by placing or applying sealing substances
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
Abstract
The invention discloses a rapid treatment method for plate bottom void of a narrow area of a red viscous soil factory, which comprises the following steps: 1) drilling a mud jacking hole: drilling a grout pressing hole in the area with the void, wherein the distance between the position of the grout pressing hole and the plate seam is more than 50cm, and the depth of the hole is 0.8-1.2 m; 2) pumping underground water: continuously pumping underground water until the ground is dry and no underground water seeps out; 3) spraying quick-setting concrete: uniformly spraying quick-setting concrete on the void part to form a waterproof layer and an initial support as soon as possible; 4) grouting: grouting is sequentially carried out from a place with large cement concrete settlement from large to small to a void part through a grouting hole, and when cement slurry overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full; 5) plugging and maintaining a grouting hole: and sealing the grouting holes by using concrete core blocks after grouting is finished, and finishing construction after curing for 3-7 days. The method is simple, the construction operation surface is small, and the maintenance speed is high.
Description
Technical Field
The invention particularly relates to a rapid treatment method for plate bottom void of a narrow area of a red viscous soil factory.
Background
Red cohesive soil is characterized by high viscosity, loose soil and rapid reduction of structural strength after meeting water. During the use period of a steel plant using red viscous soil as a foundation, the phenomena of foundation settlement and plate bottom void easily occur between B-C columns and between B-C columns during blank discharging, great potential safety hazards are brought to production operation, the area is narrow, production activities are frequent, peripheral buildings are more, and the following problems exist if a conventional comprehensive excavation and repair mode is adopted: 1. the construction time is long; 2. large machines cannot be used in narrow areas, and the safety distance between the large machines and surrounding buildings cannot be guaranteed; 3. the construction influence range is large, and the operation of production is not facilitated. Therefore, a method suitable for rapidly treating the plate bottom void in the narrow area of the red viscous soil factory area must be adopted to solve the problem.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a rapid treatment method for plate bottom void in a narrow area of a red viscous soil factory.
The purpose of the invention is realized by the following technical scheme:
a rapid treatment method for plate bottom void of a narrow area of a red viscous soil factory area comprises the following steps:
1) drilling a mud jacking hole: drilling a grout pressing hole in the area with the void, wherein the distance between the position of the grout pressing hole and the plate seam is more than 50cm, and the depth of the hole is 0.8-1.2 m; after the grouting hole is drilled, the hole is ensured to be clean, and impurities cannot enter the hole;
2) pumping underground water: continuously pumping underground water until the ground is dry and no underground water seeps out;
3) spraying quick-setting concrete: uniformly spraying quick-setting concrete on the void part to form a waterproof layer and an initial support as soon as possible;
4) grouting: grouting is sequentially carried out from a place with large cement concrete settlement from large to small to a void part through a grouting hole, and when cement slurry overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full; the panel is strictly observed to be lifted in the grouting process, and the grouting amount is timely adjusted due to the bulging phenomenon;
5) plugging and maintaining a grouting hole: and sealing the grouting holes by using concrete core blocks after grouting is finished, and finishing construction after curing for 3-7 days.
The construction of the steps is closely connected, and the operation of spraying quick-setting concrete and the operation of grouting must be continuously carried out, so that the construction quality is ensured.
The principle of the invention is as follows: the red cohesive soil has the characteristics of large viscosity, loose soil and quick reduction of structural strength after meeting water. The method is characterized in that the method comprises the following steps of observing from a plate bottom void position, flushing soil of a foundation with water to form a cavity, indicating that underground water at the position is rich, applying a measure for isolating the underground water to prevent the flushing range from being enlarged, filling the plate body void position to restore compactness, improving the supporting state of a panel, and considering that the ground surface range is too large and the treatment is difficult, so that the method only treats the plate bottom void position.
The invention has the beneficial effects that: the invention has simple construction process, only processes the plate bottom void position, has small construction operation surface, fast maintenance speed, less adopted equipment and convenient construction, and is suitable for fast processing of plate bottom void in narrow areas of factories.
Drawings
FIG. 1 is a schematic view of the structure after drilling of the void area;
wherein, 1-ground, 2-plate seam, void or warping position, and 3-grouting hole position.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention relates to a rapid treatment method for plate bottom void of a narrow area of a red viscous soil factory, which comprises the following steps:
1) drilling a mud jacking hole: drilling a grout pressing hole in the area with the void, wherein the distance between the position of the grout pressing hole and the plate seam is more than 50cm, and the depth of the hole is 0.8-1.2 m; after the grouting hole is drilled, the hole is ensured to be clean, and impurities cannot enter the hole;
2) pumping underground water: continuously pumping underground water until the ground is dry and no underground water seeps out;
3) spraying quick-setting concrete: uniformly spraying quick-setting concrete on the void part to form a waterproof layer and an initial support as soon as possible;
4) grouting: grouting is sequentially carried out from a place with large cement concrete settlement from large to small to a void part through a grouting hole, and when cement slurry overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full; the panel is strictly observed to be lifted in the grouting process, and the grouting amount is timely adjusted due to the bulging phenomenon;
5) plugging and maintaining a grouting hole: and sealing the grouting holes by using concrete core blocks after grouting is finished, and finishing construction after curing for 3-7 days.
The construction of the steps is closely connected, and the operation of spraying quick-setting concrete and the operation of grouting must be continuously carried out, so that the construction quality is ensured.
In the step 1, the grouting holes are distributed in the corners and the plates of the void areas.
The aperture of the grouting hole is 12-18cm, and the distance between the grouting hole and the plate seam is more than 50cm and is as close to the most serious part for emptying as possible.
In the step 1, the number of the grouting holes can meet the requirements of grouting and air exhaust, wherein 4-5 holes are drilled in the middle plate, 5-6 holes are drilled in the light and micro-crack plate, and 2-3 holes are drilled in the side plate.
In the step 4, the cement paste comprises cement, water, sand and stone and an additive.
The cement is Portland cement, the sandstone is clean fine sand without mud, and the additive is an expanding agent.
The grouting reinforcement material must have the following characteristics: 1. good fluidity, and ensures that the slurry material completely fills the void part at the bottom of the plate. 2. The early strength is high, and the strength of the poured slurry material is formed as early as possible, so that the early use is facilitated. 3. No segregation and bleeding exist, the water stability of the base material is ensured, and the bonding between the reinforcing layer and the concrete slab is ensured. 4. No shrinkage, and the slurry material is solidified to completely fill the board bottom void part. Therefore, in order to ensure the strength, especially the early strength, of the hardened slurry, Portland cement is selected, fine sand is selected as the sand, the requirement on cleanness is met, mud is not contained, and an expanding agent is selected as the additive; the mixed concrete requires that the bleeding rate is less than 1 percent, the expansion rate is more than 5 percent, and the slump is preferably 120 +/-20 mm.
The expanding agent is sulphoaluminate or magnesium oxide or calcium oxide.
In the step 3, the initial setting time of the rapid-hardening concrete is less than 5min, the final setting time is less than 10min, and the layer thickness of the sprayed rapid-hardening concrete is 50-60 mm.
And in the step 2, a certain amount of lime is injected into the grouting holes in the water pumping process to accelerate the drying of the ground surface.
Example 1
The phenomena of foundation settlement and plate bottom void appear between a column B and a column C of a newly-built steel-making knockout span in Anning city, and the treatment is carried out by adopting the following method:
observing the phenomena of the joint condition, the crack condition, the slab staggering, the warping and the like of the ground 1, as shown in figure 1, judging the void area, arranging holes in each corner and each slab for positioning, defining 4 holes in the middle slab, 5 holes in the slight crack slab, 2 holes in the side slab, and defining that the distance between the hole position 3 and the slab joint 2 is more than 50cm and the most serious void part is as close as possible. And drilling holes with a drilling machine after positioning, wherein the depth of each hole is 1 meter. Continuously pumping underground water by a water pump until the ground is dry and no underground water seeps out; and then uniformly spraying quick-setting concrete on the void part, wherein the initial setting time of the quick-setting concrete is 4min, the final setting time is 8min, and the layer thickness is 60 mm. The grout with bleeding rate of 0.8%, expansion rate of 6% and slump of 130mm is prepared by mixing portland cement, water, fine sand and magnesium oxide expanding agent, and is pressed from big to small in sequence from the place where the cement concrete is greatly sunk by using a grouting pump, and when the grout overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full. And sealing the grouting hole by using a concrete core block after grouting is finished, and finishing construction after curing for 5 days.
And (3) processing results: after the test in a rainy season, the ground surface is dry, no crack or settlement exists, the plate bottom void phenomenon is completely treated, and the use requirement is met.
Example 2
Observing the phenomena of ground joint condition, crack condition, slab staggering, warping and the like, judging the void range, arranging holes in each corner and each plate for positioning, determining 5 holes in the middle plate, 6 holes in the slight crack plate, 3 holes in the side plate, and enabling the distance between the hole positions and the plate seam to be more than 50cm and to be as close to the most serious void part as possible. And drilling holes with a drilling machine after positioning, wherein the depth of each hole is 1.2 m. Continuously pumping underground water by a water pump until the ground is dry and no underground water seeps out; and then uniformly spraying quick-setting concrete on the void part, wherein the initial setting time of the quick-setting concrete is 3min, the final setting time is 9min, and the layer thickness is 55 mm. The grout with bleeding rate of 0.9%, expansion rate of 7% and slump of 140mm is prepared by mixing portland cement, water, fine sand and calcium oxide expanding agent, and is pressed from big to small in sequence from the place where the cement concrete is greatly sunk by using a grouting pump, and when the grout overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full. And sealing the grouting hole by using a concrete core block after grouting is finished, and finishing construction after curing for 7 days.
Example 3
Observing the phenomena of ground joint condition, crack condition, slab staggering, warping and the like, judging the void range, arranging holes in each corner and each plate for positioning, defining 4 holes in the middle plate, 6 holes in the slight crack plate, 3 holes in the side plate, and positioning the holes at positions which are more than 50cm away from the plate joint and are as close to the most serious void part as possible. And drilling holes with a drilling machine after positioning, wherein the depth of each hole is 0.8 m. Continuously pumping underground water by a water pump until the ground is dry and no underground water seeps out; and then uniformly spraying quick-setting concrete on the void part, wherein the initial setting time of the quick-setting concrete is 5min, the final setting time is 7min, and the layer thickness is 50 mm. The grout with bleeding rate of 0.7%, expansion rate of 8% and slump of 120mm is prepared by mixing portland cement, water, fine sand and calcium sulphoaluminate expanding agent, and is pressed from big to small in sequence from the place where the cement concrete is sunk greatly by using a grouting pump, and when the grout overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full. And sealing the grouting hole by using a concrete core block after grouting is finished, and finishing construction after curing for 3 days.
Claims (10)
1. A rapid treatment method for plate bottom void in a narrow area of a red viscous soil factory area is characterized by comprising the following steps:
1) drilling a mud jacking hole: drilling a grout pressing hole in the area with the void, wherein the distance between the position of the grout pressing hole and the plate seam is more than 50cm, and the depth of the hole is 0.8-1.2 m;
2) pumping underground water: continuously pumping underground water until the ground is dry and no underground water seeps out;
3) spraying quick-setting concrete: uniformly spraying quick-setting concrete on the void part to form a waterproof layer and an initial support as soon as possible;
4) grouting: grouting is sequentially carried out from a place with large cement concrete settlement from large to small to a void part through a grouting hole, and when cement slurry overflows from other holes or overflows from side seams, cracks and the like, the grouting is considered to be full;
5) plugging and maintaining a grouting hole: and sealing the grouting holes by using concrete core blocks after grouting is finished, and finishing construction after curing for 3-7 days.
2. The rapid processing method according to claim 1, wherein in the step 1, the grouting holes are arranged in the corners and the plates of the void area.
3. The rapid processing method according to claim 1 or 2, wherein the diameter of the grouting holes is 12-18cm, and the grouting holes are positioned more than 50cm away from the plate seam and as close as possible to the most severe part of the void.
4. The rapid processing method according to claim 1 or 2, wherein in the step 1, the number of the grouting holes is ensured to meet the requirements of grouting and air exhaust, wherein 4-5 holes are drilled in the middle plate, 5-6 holes are drilled in the light microcrack plate, and 2-3 holes are drilled in the side plate.
5. The rapid processing method according to claim 1, wherein in the step 4, the cement slurry comprises cement, water, sand and stone, and an additive.
6. The rapid processing method according to claim 5, wherein the cement is portland cement, the sand is clean fine sand containing no mud, and the additive is a swelling agent.
7. The rapid processing method according to claim 6, wherein the swelling agent is a sulphoaluminate-based or magnesium oxide-based or calcium oxide-based swelling agent.
8. The rapid processing method according to claim 5 or 6, wherein the concrete bleeding rate obtained after the components of the cement paste are mixed is less than 1%, the expansion rate is more than 5%, and the slump is 120 +/-20 mm.
9. The rapid processing method according to claim 1, wherein in the step 3, the initial setting time of the rapid-setting concrete is less than 5min, the final setting time is less than 10min, and the layer thickness of the sprayed rapid-setting concrete is 50-60 mm.
10. The rapid treatment method according to claim 1, wherein in the step 2, a certain amount of lime is injected into the grouting holes during the water pumping process for accelerating the drying of the ground surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110700333.5A CN113389190A (en) | 2021-06-23 | 2021-06-23 | Rapid treatment method for plate bottom void of narrow area of red viscous soil factory |
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| CN202110700333.5A CN113389190A (en) | 2021-06-23 | 2021-06-23 | Rapid treatment method for plate bottom void of narrow area of red viscous soil factory |
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| CN110617072A (en) * | 2019-10-29 | 2019-12-27 | 中铁八局集团昆明铁路建设有限公司 | Tunnel excavation construction method for obliquely passing existing operation tunnel at minimum clear distance |
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2021
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8186907B1 (en) * | 2000-10-13 | 2012-05-29 | Charles Lee Asplin | Slab leveling system and method |
| US6976804B1 (en) * | 2003-08-26 | 2005-12-20 | Charles Lee Asplin | Method of repairing damaged concrete slabs |
| CN101168957A (en) * | 2007-10-01 | 2008-04-30 | 于心然 | Bridge brow plate emptying shallow layer grouting reinforcement technique |
| CN101200870A (en) * | 2007-12-21 | 2008-06-18 | 中铁二院工程集团有限责任公司 | Method for renovating road embankment bedding frost boiling and mud pumping damage |
| CN101413245A (en) * | 2008-10-30 | 2009-04-22 | 合肥工业大学 | Concrete foundation plate base de-empty processing method and processing device |
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| CN103174438A (en) * | 2013-03-25 | 2013-06-26 | 中交路桥建设有限公司 | Tunnel vault cavity pumping backfill construction method |
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Application publication date: 20210914 |