CN105386453A - Grouting process for preventing secondary settlement of open caisson - Google Patents
Grouting process for preventing secondary settlement of open caisson Download PDFInfo
- Publication number
- CN105386453A CN105386453A CN201510672296.6A CN201510672296A CN105386453A CN 105386453 A CN105386453 A CN 105386453A CN 201510672296 A CN201510672296 A CN 201510672296A CN 105386453 A CN105386453 A CN 105386453A
- Authority
- CN
- China
- Prior art keywords
- open caisson
- grouting
- slip casting
- grouting pipe
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a grouting process for preventing secondary settlement of an open caisson. The process includes the specific steps that firstly, in the open caisson wall manufacturing process, a steel grouting pipe is reserved in the open caisson wall and extends to a blade tip position from top to bottom; secondly, the open caisson is settled to the designed elevation according to the normal construction process for formwork erection to pour bottom board concrete; thirdly, after the strength of the bottom board concrete reaches 70% of the designed strength, primary grouting is performed through the steel grouting pipe reserved in the open caisson wall, wherein grout should be evenly and symmetrically added to prevent the open caisson from inclining; fourthly, after primary grouting is performed, secondary grouting is performed before the grout is preliminarily solidified; and fifthly, a blade tip is tightly connected with surrounding soil through mortar so that secondary settlement of the open caisson under the effect of an upper structure or an upper building can be reduced. By the adoption of the grouting process for preventing secondary settlement of the open caisson, secondary settlement of the open caisson can be reduced and the risks of differential settlement generated due to the upper structure or the upper building are reduced.
Description
Technical field
The present invention relates to a kind of building open caisson construction technique, be particularly a kind ofly applicable to the open caisson construction technique that building are arranged at top.
Background technology
It is large that open caisson has rigidity, and the plurality of advantages such as bearing capacity is high, impermeability is strong, become one of city large underground structure and the most important form of construction work of deep foundation.Still some insoluble technical problems are had in certain open caisson construction.Such as, well sinking can produce larger disturbance to the periphery soil body, open caisson will produce secondary after sinking down into design elevation under the building imposed load effect of top, secondary sinking can cause top building to produce subsidiary stress, when uneven sedimentation, probably will cause the accident such as body of wall or flooring cracking, even make total knockdown, affect top building to use, jeopardize safety.Therefore the grouting process studying the sinking of a set of prevention open caisson secondary has certain realistic meaning.The grouting process also not having reliable preventing secondary to sink in open caisson construction field at present.
Summary of the invention
The present invention will provide a kind of grouting process preventing open caisson secondary to sink, and after well sinking completes, this cover grouting process can be utilized to carry out grouting and reinforcing to the caisson cutting edge place periphery soil body, reduces open caisson secondary and sinks.
Technical scheme of the present invention: a kind of grouting process preventing open caisson secondary to sink, concrete steps are:
1. when caisson wall makes, reserved steel Grouting Pipe in caisson wall, steel Grouting Pipe should extend sword pin place from top to bottom;
2. open caisson sinks down into design elevation by normal construction technique, carries out formwork and builds underplate concrete;
3., after waiting underplate concrete intensity to reach 70% of design strength, first time slip casting is carried out by the steel Grouting Pipe be reserved in the borehole wall; Slip casting should add symmetrically, in order to avoid open caisson run-off the straight;
4., after first time slip casting, before mud initial set, second time slip casting is carried out;
5. sword pin and surrounding soil are by mortar compact siro spinning technology, sink for reducing the secondary of open caisson under top construction or building effect.
Slip casting cement used is for adopting P.O42.5 level Portland cement, and each slip casting point cement consumption is 500kg, and water/binder ratio is 0.60 ~ 0.65, and mixing time is not less than 2 minutes, and the filter screen that the cement grout aperture be stirred is not more than 3mm × 3mm filters.
The nominal diameter of steel Grouting Pipe used is preferably 20mm ~ 50mm, and steel Grouting Pipe extends the position of distance sword sole end 100mm ~ 200mm, the bottom perforate of steel Grouting Pipe, opening diameter 10mm ~ 20mm.
Beneficial effect of the present invention: the grouting process that the present invention sinks by adopting prevention open caisson secondary, the secondary contributing to reducing open caisson sinks, and reduces the risk that top building produce differential settlement.
Accompanying drawing explanation
Fig. 1 is the grouting process flow chart that prevention open caisson secondary of the present invention sinks;
Fig. 2 is the front view that prevention open caisson secondary sinking steel Grouting Pipe is arranged;
Fig. 3 is the lateral view that prevention open caisson secondary sinking steel Grouting Pipe is arranged;
Fig. 4 is range of grouting and effect schematic diagram.
Detailed description of the invention
Below in conjunction with specific embodiment, set forth the present invention further.
As shown in Figures 1 to 4, a kind of grouting process preventing open caisson secondary to sink, concrete steps are:
1., when caisson wall makes, in caisson wall 2, reserved steel Grouting Pipe 4(is shown in Fig. 2,3), steel Grouting Pipe 4 should extend sword pin 3 place from top to bottom;
2. open caisson sinks down into design elevation by normal construction technique, carries out formwork and builds base plate 1 concrete;
3., after waiting base plate 1 concrete strength to reach 70% of design strength, first time slip casting is carried out by the steel Grouting Pipe 4 be reserved in the borehole wall 2; Slip casting should add symmetrically, in order to avoid open caisson run-off the straight;
4., after first time slip casting, before mud initial set, second time slip casting is carried out;
5. sword pin 3 and surrounding soil are by mortar compact siro spinning technology, sink for reducing the secondary of open caisson under top construction or building effect.
Slip casting cement used is for adopting P.O42.5 level Portland cement, and each slip casting point cement consumption is 500kg, and water/binder ratio is 0.60 ~ 0.65, and mixing time is not less than 2 minutes, and the filter screen that the cement grout aperture be stirred is not more than 3 × 3mm filters.
The nominal diameter of steel Grouting Pipe used is preferably 20mm ~ 50mm, and steel Grouting Pipe extends the position of distance sword sole end 100mm ~ 200mm, the bottom perforate of steel Grouting Pipe, opening diameter 10mm ~ 20mm.
Upper Reaches of Huangpu River former water branch line engineering is the branch line engineering of Upper Reaches of Huangpu River water head site communicating pipe engineering.This engineering adopts pipe pushing technology to carry out constructing tunnel, and upper pipe working well and received well adopt fetching water construction.This project takes the grouting process that prevention open caisson secondary sinks.
The idiographic flow of the grouting construction process that this project adopts is:
1, grouting device is installed
When caisson wall makes, should reserve steel Grouting Pipe, the nominal diameter of steel Grouting Pipe is preferably 20mm ~ 50mm, and steel Grouting Pipe should extend the position of distance sword sole end 100mm ~ 200mm, and perforate is answered in steel Grouting Pipe bottom, opening diameter 10mm ~ 20mm.
2, slip casting
(1) Construction technology of Pouring cement mortar parameter
Mortar depositing construction parameter mainly comprises pump pressure, pump amount, slurries injection rate, slurry formula etc., and wherein pump pressure comprises out plug pressure, grouting pressure, termination pressure etc., and most important pump pressure is clear water splitting in addition, gets through the control of slurry casting machine one way valve pressure.Above-mentioned pressure need be determined through test on ground.
(2) pump pressure
Open plug pump pressure according to slurry casting machine form and settle effect difference to change, should be a little bit smaller when just starting, be preferably 0.6MPa ~ 0.8MPa, grouting pressure when stablizing is 1.0 ~ 1.5MPa, and when pressure, to be considered as pipeline more than 7MPa obstructed.
Termination pressure controls at about 1.4 ~ 1.8MPa, if there are design slurries not inject and pressure rising condition completely, advises that it is rational for opening plug pressure as final pressure index when ensureing that design slurries inject 80% with 3 times.
(3) flow rate of grouting
The selection of pump amount will meet infiltration and inject, more low better in theory, when considering the slip casting effect of this engineering open caisson, be advisable with 30 ~ 50L/min, simultaneously will with reference to the change of pressure, when constant injection pressure is lower, can suitably strengthen pump amount, otherwise should inject with low value.
(4) cement paste requirement
Cement adopts P.O42.5 level Portland cement, requires that cement is fresh simultaneously, does not lump.
Each slip casting point cement consumption 500kg, water/binder ratio is 0.60 ~ 0.65, and mixing time is not less than 2 minutes.The filter screen that the cement grout aperture be stirred is not more than 3 × 3mm filters
(5) slip casting termination criteria
Carry out grouting amount and grouting pressure dual control, control based on grouting amount (cement consumption), it is auxiliary that grouting pressure controls.
When grouting amount reaches designing requirement, slip casting can be stopped.
Hold lotus 3 minutes as grouting pressure >2MPa, adopt interval grouting mode, and when grouting amount reaches 80% of design grouting amount, can slip casting be stopped.
Claims (3)
1. the grouting process preventing open caisson secondary to sink, is characterized in that, concrete steps are:
1. when caisson wall makes, reserved steel Grouting Pipe (4) in caisson wall (2), steel Grouting Pipe (4) should extend sword pin (3) place from top to bottom;
2. open caisson sinks down into design elevation by normal construction technique, carries out formwork and builds base plate 1 concrete;
3., after waiting base plate (1) concrete strength to reach 70% of design strength, first time slip casting is carried out by the steel Grouting Pipe (4) be reserved in the borehole wall (2); Slip casting should add symmetrically, in order to avoid open caisson run-off the straight;
4., after first time slip casting, before mud initial set, second time slip casting is carried out;
5. sword pin (3) and surrounding soil are by mortar compact siro spinning technology, sink for reducing the secondary of open caisson under top construction or building effect.
2. the grouting process of prevention open caisson secondary sinking according to claim 1, it is characterized in that: slip casting cement used is for adopting P.O42.5 level Portland cement, each slip casting point cement consumption is 500kg, water/binder ratio is 0.60 ~ 0.65, mixing time is not less than 2 minutes, and the filter screen that the cement grout aperture be stirred is not more than 3mm × 3mm filters.
3. the grouting process of prevention open caisson secondary sinking according to claim 1, it is characterized in that: the nominal diameter of steel Grouting Pipe (4) used is preferably 20mm ~ 50mm, steel Grouting Pipe (4) extends the position of distance sword pin (3) bottom 100mm ~ 200mm, steel Grouting Pipe (4) bottom perforate, opening diameter 10mm ~ 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672296.6A CN105386453A (en) | 2015-10-16 | 2015-10-16 | Grouting process for preventing secondary settlement of open caisson |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510672296.6A CN105386453A (en) | 2015-10-16 | 2015-10-16 | Grouting process for preventing secondary settlement of open caisson |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105386453A true CN105386453A (en) | 2016-03-09 |
Family
ID=55419186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510672296.6A Pending CN105386453A (en) | 2015-10-16 | 2015-10-16 | Grouting process for preventing secondary settlement of open caisson |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105386453A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252349A (en) * | 2020-09-11 | 2021-01-22 | 北京市市政二建设工程有限责任公司 | Sinking construction method without drainage for open caisson |
| CN117684548A (en) * | 2024-02-01 | 2024-03-12 | 中国建筑第六工程局有限公司 | CT clamping groove permanent-face combined assembled type ground connection wall connection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000110171A (en) * | 1998-10-05 | 2000-04-18 | Naikai Aakit:Kk | Settling method for underground construction |
| CN101333812A (en) * | 2008-08-04 | 2008-12-31 | 上海市基础工程公司 | Grouter for back side grouting and its construction method |
| CN101962957A (en) * | 2010-09-30 | 2011-02-02 | 中铁大桥勘测设计院有限公司 | Sunk well structure and construction method thereof |
| CN104060623A (en) * | 2013-03-20 | 2014-09-24 | 中国二十冶集团有限公司 | Open caisson structure provided with resistance reduction mechanism and dry excavation method of open caisson |
-
2015
- 2015-10-16 CN CN201510672296.6A patent/CN105386453A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000110171A (en) * | 1998-10-05 | 2000-04-18 | Naikai Aakit:Kk | Settling method for underground construction |
| CN101333812A (en) * | 2008-08-04 | 2008-12-31 | 上海市基础工程公司 | Grouter for back side grouting and its construction method |
| CN101962957A (en) * | 2010-09-30 | 2011-02-02 | 中铁大桥勘测设计院有限公司 | Sunk well structure and construction method thereof |
| CN104060623A (en) * | 2013-03-20 | 2014-09-24 | 中国二十冶集团有限公司 | Open caisson structure provided with resistance reduction mechanism and dry excavation method of open caisson |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112252349A (en) * | 2020-09-11 | 2021-01-22 | 北京市市政二建设工程有限责任公司 | Sinking construction method without drainage for open caisson |
| CN117684548A (en) * | 2024-02-01 | 2024-03-12 | 中国建筑第六工程局有限公司 | CT clamping groove permanent-face combined assembled type ground connection wall connection method |
| CN117684548B (en) * | 2024-02-01 | 2024-04-16 | 中国建筑第六工程局有限公司 | CT clamping groove permanent-face combined assembled type ground connection wall connection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101333812B (en) | Grouter for back side grouting and its construction method | |
| CN107905218A (en) | A kind of karst cave treatment method in the construction applied to Pile In Drill In Karst Terrain | |
| CN103953365A (en) | Single/double slurry alternated grouting reinforcement technology of tunnel and device of single/double slurry alternated grouting reinforcement technology | |
| CN104612134A (en) | Cast-in place pile post-grouting construction method for pouring construction | |
| CN101525881B (en) | Structure of karst strata pile holes protecting wall and method for constructing pile holes | |
| CN104631438B (en) | Long auger guncreting uplift pile construction method | |
| CN203924085U (en) | A kind of caisson structure that is applied to collecting well | |
| CN102535441A (en) | Construction method of underground diaphragm wall | |
| CN203361143U (en) | Combination structure of high-pressure jet grouting pile and prestressed pipe pile | |
| CN102051879B (en) | Process for constructing soil anchor | |
| CN101713197A (en) | Method for sealing foundation pit pressure reduction well | |
| CN102108869A (en) | Grout stop pad construction method for kilometer vertical shaft grouting for water control | |
| CN107059904B (en) | A kind of underground pipe gallery ponding well excavation method | |
| CN105401606A (en) | Deep drawing pipe type inclination correcting method and deep drawing device | |
| CN105386453A (en) | Grouting process for preventing secondary settlement of open caisson | |
| CN104790982A (en) | Enclosed mud for underground excavation tunnel ultra-deep hole grouting | |
| CN103174135B (en) | Repair method of unqualified post-grouting bored concrete pile | |
| CN208563315U (en) | A kind of pile foundation grouting behind shaft or drift lining constructing device | |
| CN110306581A (en) | One kind new old pipeline connection well and its construction method in water rich strata | |
| KR20110019674A (en) | G.w foundation reinforcement method | |
| CN103343534A (en) | Closed precipitation method for foundation pit construction | |
| CN105386451A (en) | Grouting device for preventing secondary sinking of open caisson | |
| CN208472716U (en) | Crack geology mortar leakage prevention drill-pouring pilework | |
| CN104846837B (en) | The construction method of ultra-deep well in a kind of bright draining foundation ditch | |
| CN103510507A (en) | Slurry protection wall construction method with holes formed in cast-in-situ bored pile sand soil layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160309 |
|
| WD01 | Invention patent application deemed withdrawn after publication |