CN108411949B - Basement bottom plate methane leakage point reinforcing and sealing structure and processing method - Google Patents
Basement bottom plate methane leakage point reinforcing and sealing structure and processing method Download PDFInfo
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- CN108411949B CN108411949B CN201810262441.7A CN201810262441A CN108411949B CN 108411949 B CN108411949 B CN 108411949B CN 201810262441 A CN201810262441 A CN 201810262441A CN 108411949 B CN108411949 B CN 108411949B
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- biogas
- grouting
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- methane
- bottom plate
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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
- E02D31/008—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 entry of noxious gases, e.g. Radon
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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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
Abstract
The invention provides a basement bottom plate biogas reinforcement closed structure and a processing method, wherein the processing method comprises the following steps: pre-burying a biogas drainage pipe on the basement bottom plate, wherein a biogas drainage hole is formed at an opening at the top end of the biogas drainage pipe, observation holes are formed at other biogas leakage points of the basement bottom plate, the biogas drainage hole comprises at least one grouting hole and an observation hole, the two sides of the upper end of the biogas drainage pipe are excavated to form a groove body, and the upper end of the biogas drainage pipe is cut off; grouting cement paste and water glass in the grouting holes, and stopping grouting when grout overflows from the observation holes; after grouting is finished, sealing the methane drainage pipe, filling, sealing and reinforcing the groove body, and filling and sealing the methane leakage points; and paving chemical bond steel above each closed methane leakage point and reinforcing by using chemical anchor bolts. The method is convenient to construct and can effectively solve the problem of methane leakage of the basement bottom plate.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a basement bottom plate biogas leakage point reinforcing and sealing structure and a processing method.
Background
Along with the development of underground space, the probability of encountering harmful gases such as methane and the like during earth excavation and underground structure construction is higher and higher. Biogas is a troublesome problem in deep foundation pit engineering, harmful gas in the foundation pit can increase the construction difficulty of underground engineering, adversely affects the quality and progress of the bottom plate, and brings certain threat to the personal safety of constructors. In the existing construction, a biogas discharge pipeline is usually pre-buried and naturally discharged, and the next construction is carried out after biogas is basically dissipated. The treatment method is not safe, is easy to cause uneven settlement on the periphery, and is long in time consumption, thereby causing the loss of the construction period.
Disclosure of Invention
In view of the above situation, the invention provides a basement floor biogas leakage point reinforcing and sealing structure and a processing method thereof, which can effectively reinforce the structure of the basement floor biogas leakage point, avoid the safety problem caused by biogas leakage and save the construction period.
In order to achieve the purpose, the invention adopts the technical scheme that: a basement bottom plate biogas leakage point reinforcing and sealing treatment method comprises the following steps:
(1) pre-burying a biogas drainage pipe in the construction process of the basement bottom plate, wherein a biogas drainage hole is formed at an opening at the top end of the biogas drainage pipe, and observation holes are formed at other biogas leakage points of the basement bottom plate, the biogas drainage hole comprises at least one grouting hole for grouting and an observation hole for observation, and the hole for observation in the biogas drainage hole is also used as a standby grouting hole;
(2) excavating two side positions of the upper end of the methane drainage pipe to form a groove body, and cutting off the upper end of the methane drainage pipe;
(3) connecting a grouting pump and a grouting pipe end with a grouting hole for grouting in the methane discharge hole, starting grouting cement slurry, checking the displacement change in the observation hole and the working pressure of the grouting pump, and performing water glass grouting treatment after the slurry overflows from the observation hole;
(4) sealing the methane drainage pipe, filling, sealing and reinforcing the tank body, and filling and sealing methane leakage points at the observation hole;
(5) and paving chemical bond steel above each closed methane leakage point and reinforcing by using chemical anchor bolts.
In the embodiment of the invention, when the working pressure of the grouting pump continuously rises and exceeds the safety value early warning line, grouting is stopped for the grouting hole, the standby grouting hole is started for grouting, and the observation hole is used for observation.
In the embodiment of the invention, the implantation depth of the chemical anchor bolt is not less than 200 mm.
In the embodiment of the invention, the weight ratio of water to cement in the cement paste is 0.6:1, and triethanolamine with the mass fraction of 3 per mill is doped in the cement paste.
In the embodiment of the invention, the volume ratio of the cement to the water glass is 1: 1-1: 0.1.
In the embodiment of the invention, the leakage points in the tank body and the observation hole are sealed and reinforced by filling thixotropic epoxy resin adhesive.
In the embodiment of the present invention, in step 3, the method further includes: and performing cross grouting reinforcement on the methane discharge hole and the observation hole to ensure that the methane discharge hole and the observation hole are filled with slurry.
A basement bottom plate biogas leakage point reinforcing and sealing structure is characterized in that a biogas drainage pipe is embedded in a basement bottom plate, two sides of the upper end of the biogas drainage pipe are provided with groove bodies, epoxy resin adhesives are filled in the groove bodies, grout is injected into the inside of the biogas drainage pipe, and the top end of the biogas drainage pipe is of a sealing structure; the basement bottom plate is also provided with a methane leakage point, slurry is injected into the methane leakage point, chemical bonded steel is arranged at the methane leakage point and at the top end of the methane drainage pipe, and the chemical bonded steel is anchored with the basement bottom plate through a chemical anchor bolt.
In the embodiment of the invention, the top end of the methane drainage pipe is sealed by welding a steel plate.
In the embodiment of the invention, the slurry is cement slurry and water glass.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) according to the invention, the biogas drainage pipe is pre-buried to form the biogas drainage hole during the construction of the basement bottom plate, the grouting hole in the biogas drainage hole is grouted, meanwhile, the biogas leakage point where the biogas drainage pipe is not buried is used as the observation hole, when slurry overflows from the observation hole, the grouting of the grouting hole is stopped, and the biogas leakage point is reinforced through grouting, so that the overflow of biogas is prevented, and the stability of the structure at the leakage point is reinforced.
(2) According to the invention, grooves are formed on two sides of the top end of the methane discharge pipe, epoxy resin adhesive is filled to seal and reinforce the pre-buried methane discharge pipe, and simultaneously, methane overflow is prevented, and chemical bonding steel is laid at each methane leakage point to reinforce the methane leakage point in a manner of fixing with a chemical anchor bolt, so that methane overflow is effectively prevented, the bearing capacity of the structure is improved, and the structure is prevented from being damaged.
Drawings
FIG. 1 is a schematic diagram of step 1 of the present invention.
FIG. 2 is a schematic representation of step 4 of the present invention.
The correspondence of reference numerals to components is as follows:
a basement bottom plate 1; a biogas discharge pipe 2; chemically bonding steel 3; a chemical anchor bolt 4; a tank body 5; and a steel plate 6.
Detailed Description
To facilitate an understanding of the present invention, the following description is made in conjunction with the accompanying drawings and examples.
Referring to fig. 1 and 2, the invention provides a basement floor biogas leakage point reinforcing and sealing treatment method, which comprises the following steps:
(1) the method comprises the steps that a biogas drainage pipe 2 is pre-buried in the construction process of the basement bottom plate 1, a biogas drainage hole is formed at an opening at the top end of the pre-buried biogas drainage pipe 2, an observation hole is formed at a biogas leakage point of the basement bottom plate 1, the biogas drainage hole comprises at least one grouting hole for grouting and an observation hole for observation, and a hole for observation in the biogas drainage hole is also used as a standby grouting hole.
Specifically, in the embodiment of the present invention, in the construction process of the basement bottom plate 1, it is found that the construction is affected by the biogas, so three biogas drainage pipes 2 are buried in the basement bottom plate 1, the top openings of the three biogas drainage pipes 2 form three biogas drainage holes, which are named as A, D, in the construction process, it is found that there are two biogas leakage points besides the biogas leakage at the biogas drainage pipes 2, and the top ends of the two biogas leakage points form observation holes, which are named as B, C, E, wherein A, D is a grouting hole in the biogas drainage hole, B is a grouting hole with both the observation hole and C, E is the observation hole, and the processing method includes the following steps:
(2) excavating two side positions of the upper end of the methane drainage pipe 2 to form a groove body 5, and cutting off the upper end of the methane drainage pipe 2; in the embodiment of the invention, the groove body 5 is V-shaped or U-shaped, so that the excavation and the later filling and sealing are convenient.
(3) Connecting a grouting pump and a grouting pipe end with a grouting hole (A, D) for grouting in the methane discharge hole, starting grouting cement slurry, checking the change in the observation hole and the working pressure of a grouting pump, and performing water glass grouting treatment after slurry is discharged from the observation hole (B, C, E); when the working pressure of the grouting pump continuously rises and exceeds a safety value (1.8-2.0 MPa) early warning line, stopping grouting of the grouting hole (A, D), starting the standby grouting hole B for grouting, meanwhile, C, E is an observation hole, and when the working pressure of the grouting pump continuously rises and exceeds the safety value (1.8-2.0 MPa) early warning line, stopping grouting of the grouting hole B.
Preferably, before the grouting hole (A, D) is grouted, the grouting hole (A, D) needs to be cleaned by clear water, and accumulated water in the grouting hole (A, D) is discharged from the observation hole (B, C, E). Specific examples of the gelation time of cement paste and water glass under different conditions are given in table 1 below, wherein the modulus M of the water glass is 3.0, Be' is the concentration of the water glass, the time is the gelation time, the volume ratio is the volume ratio of the cement paste to the water glass, and the weight ratio in the right column is the weight ratio of water to cement in the cement paste. In the embodiment of the invention, the weight ratio of water to cement in the cement paste is 0.6:1, and triethanolamine with the mass fraction of 3 per mill is doped in the cement paste; the proportion of the cement paste and the water glass is adjusted in real time according to the field water discharge, and the volume ratio of the cement to the water glass is 1: 1-1: 0.1, preferably 1:0.5, the cement paste and the water glass are injected in sequence to carry out chemical reaction, the cement paste is quickly solidified, the setting time is effectively controlled, and the plugging effect is good.
TABLE 1 gelation time of cement paste, water glass paste under different conditions
Preferably, the biogas drainage holes and the observation holes are reinforced by cross grouting, any two holes of the observation holes and the grouting holes are selected as grouting holes in the cross grouting process, and the other three holes are selected as observation holes to ensure that the biogas drainage holes and the observation holes are filled with grout without omission.
(4) And after the crossed grouting reinforcement is finished for 48 hours, welding and sealing the methane drainage pipe 2 by using a steel plate 6 with the thickness of 5mm, filling, sealing and reinforcing the inside of the groove body 5 by using a thixotropic epoxy resin adhesive, and filling and sealing the methane leakage points by using the thixotropic epoxy resin adhesive.
The V-shaped groove is excavated to remove concrete around the pre-buried biogas drainage pipe 2, particularly concrete with poor construction quality and more cracks, and then thixotropic epoxy resin adhesive is used for filling, sealing and reinforcing, so that the sealing property of the concrete can be improved.
(5) Paving chemical bonded steel 3 above the pre-buried methane drainage pipe and a methane leakage point at the observation hole and reinforcing the chemical bonded steel by using a chemical anchor bolt 4, preferably, the specification of the chemical bonded steel 3 is 12 multiplied by 1000mm, polishing a structural surface layer before paving the chemical bonded steel 3, and then coating special adhesive for bonded steel, wherein the coating thickness of the special adhesive for bonded steel is not less than 3 mm; the implantation depth of the chemical anchor 4 is not less than 200 mm. The chemical bonding steel 3 is beneficial to improving the compression resistance of a concrete surface layer, avoiding the damage of a reinforcing area by concentrated load in the later period, and simultaneously is beneficial to identifying and maintaining the reinforcing area in the later period, so that manpower and material resources are saved, and the construction efficiency is improved.
While the present invention has been described in detail and with reference to the accompanying drawings and examples, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A basement bottom plate biogas leakage point reinforcement and sealing treatment method is characterized by comprising the following steps:
(1) pre-burying a biogas drainage pipe in the construction process of the basement bottom plate, wherein a biogas drainage hole is formed at an opening at the top end of the biogas drainage pipe, and observation holes are formed at other biogas leakage points of the basement bottom plate, the biogas drainage hole comprises at least one grouting hole for grouting and an observation hole for observation, and the hole for observation in the biogas drainage hole is also used as a standby grouting hole;
(2) excavating two side positions of the upper end of the methane drainage pipe to form a groove body, and cutting off the upper end of the methane drainage pipe;
(3) connecting a grouting pump and a grouting pipe end with a grouting hole for grouting in the methane discharge hole, starting grouting cement slurry, checking the displacement change in the observation hole and the working pressure of the grouting pump, and performing water glass grouting treatment after the slurry overflows from the observation hole;
(4) sealing the methane drainage pipe, filling, sealing and reinforcing the tank body, and filling and sealing methane leakage points at the observation hole;
(5) and paving chemical bond steel above each closed methane leakage point and reinforcing by using chemical anchor bolts.
2. The basement floor biogas leakage point reinforcement and sealing treatment method according to claim 1, wherein when the working pressure of the grouting pump continuously rises and exceeds a safety value early warning line, grouting is stopped for the grouting hole, the standby grouting hole is started for grouting, and an observation hole is used for observation.
3. The basement floor biogas leakage point reinforcement and sealing treatment method according to claim 1, wherein the implantation depth of the chemical anchor bolt is not less than 200 mm.
4. The reinforcing and sealing treatment method for the methane leakage point of the basement bottom plate according to claim 1, wherein the weight ratio of water to cement in the cement paste is 0.6:1, and triethanolamine with the mass fraction of 3 per thousand is doped in the cement paste.
5. The reinforcing and sealing treatment method for the methane leakage points of the basement bottom plate according to claim 1, wherein the volume ratio of the cement to the water glass is 1: 1-1: 0.1.
6. The reinforcing and sealing treatment method for the methane leakage points of the bottom plate of the basement according to claim 1, wherein the leakage points in the groove body and the observation hole are sealed and reinforced by filling thixotropic epoxy resin adhesive.
7. The basement floor biogas leakage point reinforcement and sealing treatment method according to claim 1, further comprising the following step 3: and performing cross grouting reinforcement on the methane discharge hole and the observation hole to ensure that the methane discharge hole and the observation hole are filled with slurry.
8. A reinforced sealing structure for a basement bottom plate biogas leakage point is characterized in that a biogas drainage pipe is pre-buried in a basement bottom plate, two sides of the upper end of the biogas drainage pipe are provided with groove bodies, epoxy resin adhesives are filled in the groove bodies, grout is injected into the biogas drainage pipe, and the top end of the biogas drainage pipe is of a sealing structure; the basement bottom plate is also provided with a methane leakage point, slurry is injected into the methane leakage point, chemical bonded steel is arranged at the methane leakage point and at the top end of the methane drainage pipe, and the chemical bonded steel is anchored with the basement bottom plate through a chemical anchor bolt.
9. The reinforced and closed structure for the biogas leakage point of the bottom plate of the basement according to claim 8, wherein the top end of the biogas drainage pipe is closed by welding a steel plate.
10. The basement floor biogas leakage point reinforced closure structure of claim 8, wherein the grout is cement paste and water glass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810262441.7A CN108411949B (en) | 2018-03-28 | 2018-03-28 | Basement bottom plate methane leakage point reinforcing and sealing structure and processing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810262441.7A CN108411949B (en) | 2018-03-28 | 2018-03-28 | Basement bottom plate methane leakage point reinforcing and sealing structure and processing method |
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| CN108411949A CN108411949A (en) | 2018-08-17 |
| CN108411949B true CN108411949B (en) | 2020-02-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3757216B2 (en) * | 2002-05-01 | 2006-03-22 | 株式会社白石 | Method of preventing liquefaction of saturated ground during earthquake by compressed gas injection |
| CN102359100A (en) * | 2011-07-28 | 2012-02-22 | 中铁二局股份有限公司 | Marsh gas treatment technology for large garbage landfill with complex geology |
| CN103774902A (en) * | 2012-10-25 | 2014-05-07 | 陕西龙海工程建设有限公司 | Seepage preventing and leakage stopping method for sewage plant aeration tank |
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2018
- 2018-03-28 CN CN201810262441.7A patent/CN108411949B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3757216B2 (en) * | 2002-05-01 | 2006-03-22 | 株式会社白石 | Method of preventing liquefaction of saturated ground during earthquake by compressed gas injection |
| CN102359100A (en) * | 2011-07-28 | 2012-02-22 | 中铁二局股份有限公司 | Marsh gas treatment technology for large garbage landfill with complex geology |
| CN103774902A (en) * | 2012-10-25 | 2014-05-07 | 陕西龙海工程建设有限公司 | Seepage preventing and leakage stopping method for sewage plant aeration tank |
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| CN108411949A (en) | 2018-08-17 |
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