CN107989152B - Freezing structure for protecting municipal pipeline - Google Patents
Freezing structure for protecting municipal pipeline Download PDFInfo
- Publication number
- CN107989152B CN107989152B CN201711209771.1A CN201711209771A CN107989152B CN 107989152 B CN107989152 B CN 107989152B CN 201711209771 A CN201711209771 A CN 201711209771A CN 107989152 B CN107989152 B CN 107989152B
- Authority
- CN
- China
- Prior art keywords
- freezing
- pipes
- pipe
- depth
- soil
- Prior art date
Links
- 238000007710 freezing Methods 0.000 title claims abstract description 79
- 238000010276 construction Methods 0.000 claims abstract description 26
- 210000001503 Joints Anatomy 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 239000002689 soil Substances 0.000 claims description 31
- 239000004568 cements Substances 0.000 claims description 30
- 239000007788 liquids Substances 0.000 claims description 17
- NTHWMYGWWRZVTN-UHFFFAOYSA-N Sodium silicate Chemical compound 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- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 239000001308 nitrogen Substances 0.000 description 13
- 238000009412 basement excavation Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 239000010410 layers Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 244000302661 Phyllostachys pubescens Species 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 2
- 239000010408 films Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000463 materials Substances 0.000 description 2
- 230000003287 optical Effects 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylenes Polymers 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 280000765563 Bamboo companies 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 238000010586 diagrams Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000034 methods Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
- E03B7/10—Devices preventing bursting of pipes by freezing
- E03B7/12—Devices preventing bursting of pipes by freezing by preventing freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- 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
- E02D31/08—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 transmission of vibrations or movements in the foundation soil
-
- 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
-
- 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
-
- 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
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
- E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
-
- 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
-
- 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
- E02D31/14—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 frost heaves in soil
Abstract
Description
Technical Field
The invention relates to a freezing structure for protecting municipal pipelines, which is suitable for the municipal field.
Background
With the development of basic construction, buildings (structures) and roads in cities are more and more dense, a large number of municipal pipelines are buried underground, and due to the shortage of land, projects are built in dense building groups, and due to the fact that the municipal pipelines are damaged by soil-squeezing pile construction, the cases of damage to the municipal pipelines caused by the soil-squeezing pile construction happen occasionally, so that the problem of how to prevent the soil-squeezing pile construction from influencing the municipal pipelines is paid attention to engineers.
Disclosure of Invention
The invention provides a structure for protecting municipal pipelines, which solves the problem of influence of traditional soil-extruding pile construction on the municipal pipelines.
The stress release holes are arranged at a distance of 15-20 m from a newly-built building, the diameter of each stress release hole is 500-700 mm, the depth of each stress release hole is 18-25 mm, and bamboo cages are placed in the stress release holes to prevent the stress release holes from collapsing during construction of the newly-built building.
A freezing pipe is arranged at a distance of 7-9 m away from the stress release hole, the diameter of the freezing pipe is 90-150 mm, and the wall thickness of the freezing pipe is 5-8 mm. The freezing pipes are arranged in three rows, each row of freezing pipes is arranged into an arc shape, an arc-shaped frozen wall can be formed after freezing construction is finished, and the horizontal extrusion force generated during soil-extruding pile construction can be converted into oblique force by the arc-shaped frozen wall relative to a straight frozen wall, so that the horizontal extrusion force is effectively resisted. The freezing pipes in adjacent rows are arranged in a quincunx crossing mode, the depth of the freezing pipes is 16-20 m, the distance between the freezing pipes is 500-600 mm, temperature measuring pipes are arranged between the freezing pipes in the adjacent rows at the end portions, the depth of the temperature measuring pipes is the same as that of the freezing pipes, and the expansion speed of frozen soil during freezing construction is 20-25 mm/d. The freezing pipes are connected by adopting a thread and a sealing agent, and the joints are subjected to repair welding to ensure the concentricity and the welding strength among all pipe joints.
According to the characteristics of the arc freezing wall, the freezing pipe is frozen by liquid nitrogen, the temperature of the outlet of the liquid nitrogen storage tank is controlled to be-150 to-170 ℃, the pressure is controlled to be 0.05 to 0.1MPa, the liquid nitrogen uses a heat dissipation plate in a loop to adjust the temperature, and a stop valve on the liquid nitrogen storage tank is used for adjusting the pressure. Because the liquid nitrogen temperature is low, the temperature difference between the inside and the outside of the pipe is large, and the cold loss is easy to generate, the pipeline needs to be subjected to heat preservation treatment, and the nitrogen supply main pipe is wrapped by 2 layers of 10 mm-thick polyethylene heat preservation materials and 3 layers of sealing films alternately. According to the test result, the supply amount of liquid nitrogen for achieving the frozen soil expansion speed of 20-25 mm/d is 1.2-1.3 t per hour. The pressure of the freezing pipe is controlled to be 0.05-0.1 MPa.
Arranging an anti-frost-heaving ditch at a distance of 35-50 m away from the newly-built building, wherein the width of the anti-frost-heaving ditch is 600-800 mm, the depth is determined according to the soil quality condition, and when the soil quality is clay, the depth is more than 700mm and less than or equal to 800 mm; when the soil is silt, the depth is more than 600mm and less than or equal to 700 mm; when the soil is sandy soil, the depth is 600 mm. Tests show that the frost heaving conditions of different soil qualities are different, the clay is the largest, the silt is the second, and the sandy soil is the smallest.
In order to avoid overlarge frost heaving deformation of the soil body, the frost heaving of the soil body is tested, and construction control is carried out. If the maximum frost heaving amount of the soil body exceeds or is equal to 3mm, the freezing speed needs to be increased, and the frozen soil expansion speed is 25-35 mm/d.
In order to further prevent horizontal extrusion force generated during construction from influencing a pipeline joint, three cement mixing piles are arranged at the pipeline joint, the diameter of each cement mixing pile is 450-550 mm, the cement mixing piles are arranged in a meshed mode, and moso bamboos are inserted into the cement mixing piles to resist the horizontal extrusion force generated during construction.
The construction steps comprise:
(1) arranging freezing devices
The bottom of the freezing pipe is provided with a drill bit, and the drill bit rotates to stir the soil body and simultaneously freezes the pipe to sink.
Freezing the borehole deviation is a difficult problem encountered in engineering, and in order to solve the problem, the invention adopts the following method for controlling the drilling process: the flashlight is placed in the freezing pipe to serve as an observation mark, the position of lamplight in the pipe is observed in a segmented mode through a theodolite with an optical pair electric appliance, the actual deviation distance, the deviation direction and the deviation rate of the drill hole at a certain depth are analyzed according to the similar triangle principle, and the deviation rate of the drill hole is controlled within 3%.
(2) Construction of cement mixing pile
(3) Excavation frost heaving prevention ditch
(4) Stress relief hole for excavation
(5) Freezing construction
The temperature of the positive freezing period is-30 ℃ to-32 ℃, and the temperature of the maintenance freezing period is-28 ℃ to-30 ℃.
(6) Thaw collapse compensation grouting
After thawing, the soil body sinks, so that a thawing-sinking compensation measure needs to be taken. When the sinking rate of the soil body after thawing is more than or equal to 3mm, injecting mixed liquid of cement and water glass into the frozen soil area, wherein the mixed liquid of cement and water glass is prepared according to the following proportion: the volume ratio of the cement paste to the water glass solution is 1:1, wherein the water cement ratio of the cement paste is 1, and the water glass solution is diluted by B35-B40 water glass and water added by 1-2 times of volume. The grouting pressure is 0.4-0.5 MPa.
The invention has safe and reliable operation and good performance of the protection structure.
Drawings
FIG. 1 is a schematic diagram of a structure for protecting municipal pipelines.
The reference symbols: 1. stress release hole, 2, freezing pipe, 3, temperature measuring pipe, 4, anti-freezing expansion groove, 5, cement mixing pile, 6 and pipeline.
Detailed Description
The present embodiment is described in detail below with reference to the accompanying drawings.
The present embodiment arranges stress release holes 1 at a distance of 18m from the newly built building, the diameter of the stress release holes 1 being 600mm, and the depth of the stress release holes 1 being 20 mm.
The freezing pipe 2 is arranged at a distance of 8m from the stress release hole, the diameter of the freezing pipe 2 is 100mm, and the wall thickness of the freezing pipe 2 is 6 mm. The freezing pipes 2 are arranged in three rows, each row of the freezing pipes 2 is arranged in an arc shape, and after freezing construction is finished, an arc-shaped frozen wall can be formed. The freezing pipes 2 in the adjacent rows are arranged in a quincunx-shaped crossed mode, the depth of each freezing pipe 2 is 18m, the distance between every two freezing pipes 2 is 550mm, the temperature measuring pipe 3 is arranged between the freezing pipes 2 in the adjacent rows at the end portions, the depth of each temperature measuring pipe 3 is the same as that of each freezing pipe 2, and the expansion speed of frozen soil during freezing construction is 20-25 mm/d. The freezing pipes 2 are connected by adopting a thread and a sealing agent, and the joints are subjected to repair welding to ensure the concentricity and the welding strength among all pipe joints.
The freezing pipe 2 is frozen by liquid nitrogen, the temperature of the outlet of the liquid nitrogen storage tank is controlled at minus 160 ℃, the pressure is controlled at 0.08MPa, the liquid nitrogen uses a heat dissipation plate in a loop to adjust the temperature, and a stop valve on the liquid nitrogen storage tank is used for adjusting the pressure. And (3) carrying out heat preservation treatment on the pipeline, wherein the nitrogen supply main pipe is alternately wrapped by 2 layers of 10 mm-thick polyethylene heat preservation materials and 3 layers of sealing films. The supply amount of the liquid nitrogen is 1.2-1.3 t per hour. The pressure of the freezing pipe 2 is controlled at 0.08 MPa.
And arranging an anti-frost heaving ditch 4 at a distance of 38m from the newly built building, wherein the width of the anti-frost heaving ditch 4 is 700mm, and the depth of the anti-frost heaving ditch is 650 mm.
If the maximum frost heaving amount of the soil body exceeds or is equal to 3mm, the freezing speed needs to be increased, and the frozen soil expansion speed is 25-35 mm/d.
Three cement mixing piles 5 are arranged at the joint position of the pipeline 6, the diameter of each cement mixing pile 5 is 500mm, the cement mixing piles 5 are arranged in a meshing mode, and moso bamboos are inserted into the cement mixing piles 5.
The construction steps comprise:
(1) arranging freezing devices
The bottom of the freezing pipe 2 is provided with a drill bit, and the drill bit rotates to stir the soil body and simultaneously the freezing pipe 2 sinks for construction.
The following method is adopted to control the drill hole deflection: the flashlight is placed in the freezing pipe 2 to serve as an observation mark, the position of lamplight in the pipe is observed in a segmented mode through a theodolite with an optical pair electric appliance, the actual deviation distance, the deviation direction and the deviation rate of the drill hole at a certain depth are analyzed according to the similar triangle principle, and the deviation rate of the drill hole is controlled within 3%.
(2) Construction of cement mixing pile 5
(3) Excavation frost heaving prevention ditch 4
(4) Excavation stress relief hole 1
(5) Freezing construction
The temperature of the positive freezing period is-30 ℃ to-32 ℃, and the temperature of the maintenance freezing period is-28 ℃ to-30 ℃.
(6) Thaw collapse compensation grouting
When the sinking rate of the soil body after thawing is more than or equal to 3mm, injecting mixed liquid of cement and water glass into the frozen soil area, wherein the mixed liquid of cement and water glass is prepared according to the following proportion: the volume ratio of the cement paste to the water glass solution is 1:1, wherein the water cement ratio of the cement paste is 1, and the water glass solution is diluted by B35-B40 water glass and water added by 1-2 times of volume. The grouting pressure is 0.4-0.5 MPa.
Claims (1)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711209771.1A CN107989152B (en) | 2016-04-30 | 2016-04-30 | Freezing structure for protecting municipal pipeline |
| CN201610311186.1A CN105862932B (en) | 2016-04-30 | 2016-04-30 | Protect the structure of municipal pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711209771.1A CN107989152B (en) | 2016-04-30 | 2016-04-30 | Freezing structure for protecting municipal pipeline |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date | |
|---|---|---|---|---|
| CN201610311186.1A Division CN105862932B (en) | 2016-04-30 | 2016-04-30 | Protect the structure of municipal pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107989152A CN107989152A (en) | 2018-05-04 |
| CN107989152B true CN107989152B (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610311186.1A CN105862932B (en) | 2016-04-30 | 2016-04-30 | Protect the structure of municipal pipeline |
| CN201711209752.9A CN107989121B (en) | 2016-04-30 | 2016-04-30 | Freezing structure for protecting municipal pipelines in city |
| CN201711212375.4A CN107989079B (en) | 2016-04-30 | 2016-04-30 | Structure for protecting municipal pipeline in city |
| CN201711209765.6A CN108036151B (en) | 2016-04-30 | 2016-04-30 | Protect the construction method of municipal pipeline |
| CN201711209771.1A CN107989152B (en) | 2016-04-30 | 2016-04-30 | Freezing structure for protecting municipal pipeline |
Family Applications Before (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610311186.1A CN105862932B (en) | 2016-04-30 | 2016-04-30 | Protect the structure of municipal pipeline |
| CN201711209752.9A CN107989121B (en) | 2016-04-30 | 2016-04-30 | Freezing structure for protecting municipal pipelines in city |
| CN201711212375.4A CN107989079B (en) | 2016-04-30 | 2016-04-30 | Structure for protecting municipal pipeline in city |
| CN201711209765.6A CN108036151B (en) | 2016-04-30 | 2016-04-30 | Protect the construction method of municipal pipeline |
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| CN (5) | CN105862932B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108797602A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of piled anchor and liquid nitrogen frozen soil wall composite supporting construction and its construction method |
| CN108797601A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of construction method of piled anchor and liquid nitrogen frozen soil wall composite support system |
| CN108797605A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of the piled anchor formula composite supporting construction and its construction method of combination liquid nitrogen frozen soil wall |
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| Publication number | Publication date |
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| CN105862932A (en) | 2016-08-17 |
| CN107989152A (en) | 2018-05-04 |
| CN108036151A (en) | 2018-05-15 |
| CN107989079B (en) | 2020-06-12 |
| CN107989121B (en) | 2020-06-05 |
| CN107989079A (en) | 2018-05-04 |
| CN105862932B (en) | 2018-08-17 |
| CN108036151B (en) | 2019-06-04 |
| CN107989121A (en) | 2018-05-04 |
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