CN109577313A - A kind of cold region factory built-up areas grouting and reinforcing technology - Google Patents
A kind of cold region factory built-up areas grouting and reinforcing technology Download PDFInfo
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- CN109577313A CN109577313A CN201811513494.8A CN201811513494A CN109577313A CN 109577313 A CN109577313 A CN 109577313A CN 201811513494 A CN201811513494 A CN 201811513494A CN 109577313 A CN109577313 A CN 109577313A
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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Abstract
The invention discloses a kind of cold region factory built-up areas grouting and reinforcing technology, 1, foundation fundamental importance Program design slip casting depth and injected hole pipe lay mode, combined ground building and Equipment Foundations importance degree, determine that the slip casting depth of different parts is；2, slip casting spacing and arrangement: curtain hole pitch of holes, pitch-row and array pitch are 2.5-3.5m, using quincuncial arrangement；1 row's curtain-grouting hole is arranged in slip casting place periphery, remaining is filling, consolidates injected hole；3, grouting with plunger and requirement；4, grouting process designs；5 injected holes close mode: slip casting aperture and segmentation closing are all made of embolism closing, and plug diameter should be adapted in bore diameter, and embolism confining pressure is no less than 3.0Mpa；6, slip casting condition is terminated；7, drilling construction.
Description
Technical field
The present invention relates to a kind of cold region factory built-up areas grouting and reinforcing technologies.
Background technique
In frigid plateau region building industry facility, the stability problem for resolving basis is first had to.Due to highland and severe cold
The particularity of regional earth formation and forming process is usually present the geologic structure that hole, frozen soil etc. are unfavorable for factory construction,
In addition these area it is meagrely-populated for a long time, geologic information is deficient, the experience that can be used for reference is few.How in very good solution
The unfavorable factor in areal geology structure is stated, is the core of engineering construction and factory's trouble-free operation.And for this kind of region
Industrial plants through building up are then more difficult in the sinking of appearance basis, deformed hazard management.Governance process needs take into account through
All various factors such as Ji property, reliability, the stability of existing facility, the design of resolution need science, rigorous skill
Art demonstration and analysis, and a large amount of geologic survey and test result are verified.Implementation process needs stringent accurate operation
The a series of preconditions such as process, scientific and reasonable construction method, quantization controllable quality standard, high-quality construction team
As guarantee.
Summary of the invention
The purpose of the present invention is to provide a kind of cold region factory built-up areas grouting and reinforcing technologies, after capable of reaching improvement
The natural soil cave in ground lower part is filled, collapsibility is eliminated and administers groundwork bearing capacity >=300KPa management goal, is improved
Globality, osmotic stability and the Compaction variables of ground.
The object of the present invention is achieved like this, a kind of cold region factory built-up areas grouting and reinforcing technology, operating procedure
It is as follows:
1, mode, combined ground building and Equipment Foundations are laid according to fundamental importance Program design slip casting depth and injected hole pipe
Importance degree determines the slip casting depth of different parts are as follows:
(1) curtain-grouting hole, depth are to close on depth of foundation；
(2) importance is critically important basis, depth 25m；Importance is important basis, lower 3 times of bases based on depth
Width, but it is not less than 10m, depth capacity is not more than 20m；Importance is general basis, lower 5m based on depth；
(3) region influenced in production process vulnerable to water, such as the ground in gutter, slip casting depth is 5m；
(4) importance is general, the flooring not influenced under normal circumstances by water, takes waterproof measure appropriate in terrace
Afterwards, injecting treatment is not taken；
(5) different grouting and reinforcing schemes are taken in adjacent slip casting region, execute by the higher grouting and reinforcing scheme of importance rate；
2, slip casting spacing and arrangement:
Curtain hole pitch of holes, pitch-row and array pitch are 2.5-3.5m, using quincuncial arrangement；1 row is arranged in slip casting place periphery
Curtain-grouting hole, remaining is filling, consolidates injected hole；
3, grouting with plunger and requirement:
(1) mortar depositing construction order:
Injected hole construction is using the principle for dividing sequence to encrypt, concrete order are as follows:
；
(2) single hole grouting construction method:
The grouting method combined using pure pressure type slip casting and list liquid ihrigising is segmented from top to bottom with filling concretion method, it is most laggard
Row deep hole filling consolidation slip casting, for each injected hole, specific steps are as follows:
Shallow bore hole list liquid silication mortar depositing construction is carried out first, is controlled by the pump amount that injection rate is 40-60L/min, when aperture slip casting pressure
When power reaches design pressure, wherein curtain-grouting hole maintains 10min, and filling, consolidation injected hole maintain 15min, terminate this section note
Slurry；
Shallow bore hole filling consolidation slip casting is carried out later, is by injection rate, the pump amount control of 70-100L/min, when aperture grouting pressure
When reaching design pressure, wherein curtain-grouting hole maintains 10min；Filling, consolidation injected hole maintain 15min, terminate this section of slip casting；
Finally carry out deep hole filling consolidation slip casting, after drilling Shallow hole grouting layer, tripping in casing, with cement slurry closed casing and stratum
Gap, is drilled into design hole depth, is by injection rate, and the pump amount control of 70-100L/min, when aperture, grouting pressure reaches table
3.2.4.1 when design pressure, wherein curtain-grouting hole maintains 10min；Filling, consolidation injected hole maintain 15min, terminate this section note
Slurry；
(3) single hole construction procedure, each main construction procedure of single hole slip casting are as follows:
；
(4) sequence is divided to encrypt principle, mortar depositing construction must implement a point sequence encryption principle:
2 sequences of curtain-grouting point are implemented by " divide sequence encryption, be perfused every hole " principle；Consolidate slip casting point 3 sequences, by " divide sequence encryption, every
Arrange every hole be perfused " principle implement；There must not be 2 or more hole slip casting simultaneously within the scope of 6m；
(5) grouting plug placement location:
Grouting plug placement location is in slip casting section section top 0.5m, anti-leak-stopping note；
(6) slip casting waits:
After the one section of slip casting of each slip casting section, after should generally waiting grout cures, next section of bored grouting construction can be carried out；
(7) grout leaking is handled:
When the mutual grout leaking of injected hole, mutually string hole parallel connection perfusion can be used, but simultaneously orifice should not be more than 3, and should be noted that control note
Pressure is starched, prevents the soil body from lifting；
4, grouting process designs:
(1) grouting pressure
Effective grouting pressure is calculated as follows:
P=P1+P2-P3-P4
In formula: P-grouting pressure (abbreviation total pressure), MPa；
P1-orifice pressure gage instruction pressure (abbreviation meter pressure), MPa；
The slurries column gravity pressure at P2-orifice pressure gage center to slip casting section center, MPa；
Pressure of the P3-underground water to slip casting section, MPa；
The pressure loss that P4-slurries flow in Grouting Pipe and drilling, MPa.
P2, P3 can be calculated as follows:
P2=hγg P3=hwγw
In formula: h-height of the orifice pressure gage center to slip casting section center, m；
Height of the hw-level of ground water to slip casting section center, m；
γ g-slurries severe, N/m3；
γ w-water severe, N/m3
Grouting pressure is provided as follows:
Grouting pressure is to be mounted on the Median control mode of the pressure gauge in inlet pipe road aperture；
When grout leaking hole (group) or porous parallel-connected grouting, grouting pressure should be controlled respectively, while reinforcing deformation monitoring, prevent soil
Body destroys；
(2) flow rate of grouting:
Provide as follows to flow rate of grouting (injection rate): single liquid ihrigising is controlled by 40-60L/min；Filling consolidation hair presses 70-
100L/min control；
(3) slip casting segment length:
Under normal circumstances, with single liquid ihrigising slip casting section for first slip casting section, embolism detent position is nature subsurface 1.0m
It is interior；It is a slip casting section from first slip casting section to bottom hole after the completion of shallow layer grouting, embolism detent position is shallow layer grouting layer bottom
In portion 1.0m；
(4) grouting mode:
Compared by test, grouting and reinforcing is by dividing sequence to encrypt principle, using being segmented pure pressure type slip casting and orifice closing from top to bottom
The synthetic jet grouting method that pure pressure type slip casting combines, grouting mode are " shallow layer foundation waterglass-sodium chloride list liquid silication "+" consolidation
Slip casting and deep foundation base cement-sodium silicate list liquid filling consolidation, compacting grouting "；
(5) injected hole closes mode:
Slip casting aperture and segmentation closing are all made of embolism closing, and plug diameter should be adapted in bore diameter, embolism confining pressure
No less than 3.0Mpa；
5, slip casting condition is terminated:
(1) each slip casting section of segmenting slip casting terminates slip casting condition:
By field test, slip casting section terminates slip casting condition are as follows:
1. under desired injection rate, the aperture grouting pressure of each slip casting section reaches design pressure and maintains to curtain-grouting hole
10min terminates this section of slip casting；
2. under desired injection rate, the aperture grouting pressure of each slip casting section reaches table design pressure to filling, consolidation injected hole
And 15min is maintained, terminate this section of slip casting；
3. terminating slip casting away from range grout other than the 3.0m of slip casting aperture；
4. all kinds of injected holes, under desired injection rate, when the aperture grouting pressure of slip casting section skyrockets, more than table design pressure value
Afterwards, it is difficult to maintain to stablize, continue to rise, can directly terminate this section of slip casting；
(2) injected hole terminates slip casting condition and terminates slip casting post-treatment measure:
Each segmenting slip casting Duan Jun of injected hole, which reaches, to be terminated slip casting condition and terminates slip casting, the last one slip casting section is segmented position
Enter in orifice sleeve, then can terminate the hole slip casting；
After injected hole complete opening slip casting terminates, sealing of hole, method for sealing are as follows: after slip casting, usual complete opening is are carried out to injected hole
It, can be directly in aperture section progress hole-sealing grouting processing through being full of slurry；Grouting plug is arranged in aperture, continues slip casting envelope
Hole.Pressure is typically no less than 1Mpa；
6, drilling construction:
(1) injected hole drilling method:
It for the stabilization for keeping hole wall, prevents construction from causing the sedimentation and deformation of soil body row, preferably uses hidden hole drilling to creep into, mud can also be used
Retaining wall drilling or casing follow-up drilling are starched, but quasi- consolidation grouting section stratum must not be isolated in casing；
(2) injected hole hole structure:
Shallow bore hole opening diameter is not less than 90mm；Deep hole opening diameter is not less than 110mm, after penetrating shallow layer grouting layer, setting of casing, and set
Bore is can ensure lower boreholes smooth construction as principle, and with the gap between cement grout closed casing and stratum,
It uses φ 90mm bore drill bit instead to continue to creep into, until design hole depth；
(3) drilling construction generally requires:
Boring aperture is φ 90mm- φ 150mm, and aperture need to complement one another with slip casting embolism,
Hole location, depth, aperture, drilling sequences of drilling etc. should execute as required, and the deviation of hole location and design hole location must not be big
In 30cm；
(4) shallow layer drilling construction requirement:
Shallow layer drilling refers to the drilling for being mainly used for the hole depth of single liquid ihrigising in 0-8m；
Shallow layer drilling answers one-step pore-creating,
(5) deep layer hole construction requirement:
Deep layer drill refers to that hole depth reaches design drilling depth, the drilling of main nearly deep layer filling consolidation slip casting；Deep layer drill is applied
Working hour should first creep into 6.0m, tripping in φ 110mm or so casing, and carry out Seal treatment to casing and hole wall gap；Casing and hole
After the closing of wall gap reaches intensity requirement, deep well drilling is carried out, until design hole depth, it is difficult that drilling meets cave, collapse hole or chip off-falling
When creeping into, injecting treatment, then row drilling can be carried out, gas leakage (water) or water burst are concentrated in such as discovery, should find out that situation, analysis are former
Cause, row is crept into again after processing；
Injected hole (section) is after drilling, Ying Jinhang bore flushing, and bottom hole deposition thickness must not exceed the 2.0% of design hole depth,
It is verified by engineering practice, can guarantee to be completed factory foundation grouting and reinforcing quality using above-mentioned grouting process.
The method of the present invention natural soil cave development, slip casting mesh in base geotechnical engineering condition, especially coarse grain composite soil in combination
Mainly filling and injecting slurry, while coarse grain composite soil have collapsibility, it is necessary to caused by preventing because of slip casting additional settlement generate.Thus
Through multiple Comparability test, distinctive grouting filling operation order and operational method have been founded.This patent specifies that grouting process is joined
Number, drilling construction, Construction technology of Pouring cement mortar requirement.And engineering practice proves that, obtain good result.It is built to complex geological district
At grouting and consolidation on foundation engineering prevention design and implementation in factory, there is reference and directive significance.
Specific embodiment
A kind of cold region factory built-up areas grouting and reinforcing technology, it is characterised in that operating procedure is as follows:
1, mode, combined ground building and Equipment Foundations are laid according to fundamental importance Program design slip casting depth and injected hole pipe
Importance degree determines the slip casting depth of different parts are as follows:
(1) curtain-grouting hole, depth are to close on depth of foundation；
(2) importance is critically important basis, depth 25m；Importance is important basis, lower 3 times of bases based on depth
Width, but it is not less than 10m, depth capacity is not more than 20m；Importance is general basis, lower 5m based on depth；
(3) region influenced in production process vulnerable to water, such as the ground in gutter, slip casting depth is 5m；
(4) importance is general, the flooring not influenced under normal circumstances by water, takes waterproof measure appropriate in terrace
Afterwards, injecting treatment is not taken；
(5) different grouting and reinforcing schemes are taken in adjacent slip casting region, execute by the higher grouting and reinforcing scheme of importance rate；
2, slip casting spacing and arrangement:
Curtain hole pitch of holes, pitch-row and array pitch are 2.5-3.5m, using quincuncial arrangement；1 row is arranged in slip casting place periphery
Curtain-grouting hole, remaining is filling, consolidates injected hole；
3, grouting with plunger and requirement:
(1) mortar depositing construction order:
Injected hole construction is using the principle for dividing sequence to encrypt, concrete order are as follows:
；
(2) single hole grouting construction method:
The grouting method combined using pure pressure type slip casting and list liquid ihrigising is segmented from top to bottom with filling concretion method, it is most laggard
Row deep hole filling consolidation slip casting, for each injected hole, specific steps are as follows: progress shallow bore hole list liquid silication mortar depositing construction first is pressed
The pump amount that injection rate is 40-60L/min controls, and when aperture, grouting pressure reaches design pressure, wherein curtain-grouting hole is maintained
10min, filling, consolidation injected hole maintain 15min, terminate this section of slip casting；Shallow bore hole filling consolidation slip casting is carried out later, by injection rate
For the pump amount control of 70-100L/min, when aperture, grouting pressure reaches design pressure, wherein curtain-grouting hole is maintained
10min；Filling, consolidation injected hole maintain 15min, terminate this section of slip casting；Deep hole filling consolidation slip casting is finally carried out, shallow bore hole is drilled
After grouting layer, tripping in casing is drilled into design hole depth with cement slurry closed casing and ground lamellar spacing, is 70-100L/ by injection rate
The pump amount of min controls, and when aperture, grouting pressure reaches design pressure, wherein curtain-grouting hole maintains 10min；Filling, consolidation
Injected hole maintains 15min, terminates this section of slip casting；
(3) single hole construction procedure, each main construction procedure of single hole slip casting are as follows:
；
(4) sequence is divided to encrypt principle, mortar depositing construction must implement a point sequence encryption principle: 2 sequences of curtain-grouting point, by " divide sequence encryption, every
Hole perfusion " principle is implemented；3 sequences of slip casting point are consolidated, are implemented by the principle of " divide sequence encryption, be perfused every row every hole "；Within the scope of 6m not
There must be 2 or more hole slip casting simultaneously；
(5) grouting plug placement location: grouting plug placement location is in slip casting section section top 0.5m, anti-leak-stopping note；
(6) slip casting waits: after the one section of slip casting of each slip casting section, after should generally waiting grout cures, can carry out next section of drilling
Mortar depositing construction；
(7) grout leaking is handled: when the mutual grout leaking of injected hole, mutually string hole parallel connection perfusion can be used, but simultaneously orifice should not be more than 3, and
It should be noted that control grouting pressure, prevents the soil body from lifting；
4, grouting process designs:
(1) grouting pressure
Effective grouting pressure is calculated as follows:
P=P1+P2-P3-P4
In formula: P-grouting pressure (abbreviation total pressure), MPa；
P1-orifice pressure gage instruction pressure (abbreviation meter pressure), MPa；
The slurries column gravity pressure at P2-orifice pressure gage center to slip casting section center, MPa；
Pressure of the P3-underground water to slip casting section, MPa；
The pressure loss that P4-slurries flow in Grouting Pipe and drilling, MPa.
P2, P3 can be calculated as follows:
P2=hγg P3=hwγw
In formula: h-height of the orifice pressure gage center to slip casting section center, m；
Height of the hw-level of ground water to slip casting section center, m；
γ g-slurries severe, N/m3；
γ w-water severe, N/m3
Provide as follows to grouting pressure: grouting pressure is to be mounted on the Median control mode of the pressure gauge in inlet pipe road aperture；Grout leaking
When hole (group) or porous parallel-connected grouting, grouting pressure should be controlled respectively, while reinforcing deformation monitoring, prevent damage of soil body；
(2) flow rate of grouting: provide as follows to flow rate of grouting (injection rate): single liquid ihrigising is controlled by 40-60L/min；Filling is solid
It binds up one's hair and is controlled by 70-100L/min；
(3) slip casting segment length: under normal circumstances, with single liquid ihrigising slip casting section for first slip casting section, embolism detent position is
In natural subsurface 1.0m；It is a slip casting section, embolism detent position from first slip casting section to bottom hole after the completion of shallow layer grouting
For in shallow layer grouting layer bottom 1.0m；
(4) grouting mode: being compared by test, and grouting and reinforcing is infused by dividing sequence to encrypt principle using pure pressure type is segmented from top to bottom
The synthetic jet grouting method combined with the pure pressure type slip casting of orifice closing is starched, grouting mode is " shallow layer foundation waterglass-sodium chloride list liquid
Silication "+" consolidation slip casting and deep foundation base cement-sodium silicate list liquid filling consolidation, compacting grouting "；
(5) injected hole closes mode: slip casting aperture and segmentation closing are all made of embolism closing, and plug diameter should be in bore diameter phase
It adapts to, embolism confining pressure is no less than 3.0Mpa；
5, slip casting condition is terminated:
(1) each slip casting section of segmenting slip casting terminates slip casting condition:
By field test, slip casting section terminates slip casting condition are as follows:
1. under desired injection rate, the aperture grouting pressure of each slip casting section reaches design pressure and maintains to curtain-grouting hole
10min terminates this section of slip casting；
2. under desired injection rate, the aperture grouting pressure of each slip casting section reaches table design pressure to filling, consolidation injected hole
And 15min is maintained, terminate this section of slip casting；
3. terminating slip casting away from range grout other than the 3.0m of slip casting aperture；
4. all kinds of injected holes, under desired injection rate, when the aperture grouting pressure of slip casting section skyrockets, more than table design pressure value
Afterwards, it is difficult to maintain to stablize, continue to rise, can directly terminate this section of slip casting；
(2) injected hole terminates slip casting condition and terminates slip casting post-treatment measure: each segmenting slip casting Duan Jun of injected hole reaches eventually
Only slip casting condition and slip casting is terminated, the last one slip casting section segmentation position has entered in orifice sleeve, then can terminate the hole slip casting；
After injected hole complete opening slip casting terminates, sealing of hole, method for sealing are as follows: after slip casting, usual complete opening has been filled are carried out to injected hole
Full slurry, can be directly in aperture section progress hole-sealing grouting processing；Grouting plug is arranged in aperture, continues injection hole sealing；
Pressure is typically no less than 1Mpa；
6, drilling construction:
(1) injected hole drilling method: for the stabilization for keeping hole wall, preventing construction from causing the sedimentation and deformation of soil body row, preferably uses latent
Mud off drilling or casing follow-up drilling can also be used in hole drill drilling, but quasi- consolidation grouting section stratum must not be isolated in casing；
(2) injected hole hole structure: shallow bore hole opening diameter is not less than 90mm；Deep hole opening diameter is not less than 110mm, penetrates shallow-layer
After grouting layer, setting of casing, casing inner diameter is can ensure lower boreholes smooth construction as principle, and with cement grout closed casing
Gap between stratum uses φ 90mm bore drill bit instead and continues to creep into, until design hole depth；
(3) drilling construction generally requires: boring aperture is φ 90mm- φ 150mm, and aperture need to complement one another with slip casting embolism, is bored
Hole location, depth, aperture, the drilling sequences in hole etc. should execute as required, and the deviation of hole location and design hole location is not greater than 30cm；
(4) shallow layer drilling construction requirement: shallow layer drilling refers to the drilling for being mainly used for the hole depth of single liquid ihrigising in 0-8m；Shallow-layer
One-step pore-creating is answered in drilling,
(5) deep layer hole construction requirement: deep layer drill refers to that hole depth reaches design drilling depth, main nearly deep layer filling consolidation slip casting
Drilling；When deep layer drill is constructed, 6.0m, tripping in φ 110mm or so casing should be first crept into, and carry out to casing and hole wall gap
Seal treatment；After casing and the closing of hole wall gap reach intensity requirement, deep well drilling is carried out, until design hole depth, drilling are met
When cave, collapse hole or chip off-falling are difficult to creep into, injecting treatment, then row drilling can be carried out, such as discovery is concentrated gas leakage (water) or water burst, answered
Find out situation, analysis reason, row is crept into again after processing；Injected hole (section) is after drilling, Ying Jinhang bore flushing, bottom hole
Deposition thickness must not exceed the 2.0% of design hole depth, is verified, can be guaranteed using above-mentioned grouting process built by engineering practice
At factory foundation grouting and reinforcing quality.
Claims (1)
1. a kind of cold region factory built-up areas grouting and reinforcing technology, it is characterised in that operating procedure is as follows: 1), according to basis weight
The property wanted Program design slip casting depth and injected hole pipe lay mode, combined ground building and Equipment Foundations importance degree, determine
The slip casting depth of different parts are as follows: (1) curtain-grouting hole, depth are to close on depth of foundation；(2) importance is critically important base
Plinth, depth 25m；Importance is important basis, lower 3 times of foundation widths based on depth, but is not less than 10m, depth capacity
No more than 20m；Importance is general basis, lower 5m based on depth；(3) region influenced in production process vulnerable to water, such as
The ground in gutter, slip casting depth are 5m；(4) importance is general, the flooring not influenced under normal circumstances by water, on ground
After waterproof measure appropriate is taken on level ground, injecting treatment is not taken；(5) different grouting and reinforcing schemes are taken in adjacent slip casting region,
It is executed by the higher grouting and reinforcing scheme of importance rate；2), slip casting spacing and arrangement: curtain hole pitch of holes, pitch-row and array pitch
It is 2.5-3.5m, using quincuncial arrangement；1 row's curtain-grouting hole is arranged in slip casting place periphery, remaining is filling, consolidates slip casting
Hole；3), grouting with plunger and requirement:
(1) mortar depositing construction order: injected hole construction is using the principle for dividing sequence to encrypt, concrete order are as follows:
；
(2) it single hole grouting construction method: uses and is segmented pure pressure type slip casting and single liquid ihrigising and filling concretion method phase from top to bottom
In conjunction with grouting method, deep hole filling consolidation slip casting is finally carried out, for each injected hole, specific steps are as follows: carry out first shallow
Hole list liquid silication mortar depositing construction is controlled by the pump amount that injection rate is 40-60L/min, and when aperture, grouting pressure reaches design pressure
When, wherein curtain-grouting hole maintains 10min, and filling, consolidation injected hole maintain 15min, terminate this section of slip casting；Shallow bore hole is carried out later
Filling consolidation slip casting is the pump amount control of 70-100L/min by injection rate, when aperture, grouting pressure reaches design pressure,
Middle curtain-grouting hole maintains 10min；Filling, consolidation injected hole maintain 15min, terminate this section of slip casting；Finally carry out deep hole filling
Slip casting is consolidated, after drilling Shallow hole grouting layer, tripping in casing is drilled into design hole depth, is pressed with cement slurry closed casing and ground lamellar spacing
The pump amount that injection rate is 70-100L/min controls, and when aperture, grouting pressure reaches design pressure, wherein curtain-grouting hole is maintained
10min；Filling, consolidation injected hole maintain 15min, terminate this section of slip casting；
(3) single hole construction procedure, each main construction procedure of single hole slip casting are as follows:
；
(4) sequence is divided to encrypt principle, mortar depositing construction must implement a point sequence encryption principle: 2 sequences of curtain-grouting point, by " divide sequence encryption, every
Hole perfusion " principle is implemented；3 sequences of slip casting point are consolidated, are implemented by the principle of " divide sequence encryption, be perfused every row every hole "；Within the scope of 6m not
There must be 2 or more hole slip casting simultaneously；
(5) grouting plug placement location: grouting plug placement location is in slip casting section section top 0.5m, anti-leak-stopping note；
(6) slip casting waits: after the one section of slip casting of each slip casting section, after should generally waiting grout cures, can carry out next section of drilling
Mortar depositing construction；
(7) grout leaking is handled: when the mutual grout leaking of injected hole, mutually string hole parallel connection perfusion can be used, but simultaneously orifice should not be more than 3, and
It should be noted that control grouting pressure, prevents the soil body from lifting；
4), grouting process designs: (1) grouting pressure, effective grouting pressure are calculated as follows:
P=P1+P2-P3-P4；
In formula: P-grouting pressure (abbreviation total pressure), MPa；
P1-orifice pressure gage instruction pressure (abbreviation meter pressure), MPa；
The slurries column gravity pressure at P2-orifice pressure gage center to slip casting section center, MPa；
Pressure of the P3-underground water to slip casting section, MPa；
The pressure loss that P4-slurries flow in Grouting Pipe and drilling, Mpa；
P2, P3 can be calculated as follows:
P2=hγg P3=hwγw
In formula: h-height of the orifice pressure gage center to slip casting section center, m；
Height of the hw-level of ground water to slip casting section center, m；
γ g-slurries severe, N/m3；
γ w-water severe, N/m3
Provide as follows to grouting pressure: grouting pressure is to be mounted on the Median control mode of the pressure gauge in inlet pipe road aperture；Grout leaking
When hole (group) or porous parallel-connected grouting, grouting pressure should be controlled respectively, while reinforcing deformation monitoring, prevent damage of soil body；
(2) flow rate of grouting: provide as follows to flow rate of grouting (injection rate): single liquid ihrigising is controlled by 40-60L/min；Filling is solid
It binds up one's hair and is controlled by 70-100L/min；
(3) slip casting segment length: under normal circumstances, with single liquid ihrigising slip casting section for first slip casting section, embolism detent position is
In natural subsurface 1.0m；It is a slip casting section, embolism detent position from first slip casting section to bottom hole after the completion of shallow layer grouting
For in shallow layer grouting layer bottom 1.0m；
(4) grouting mode: being compared by test, and grouting and reinforcing is infused by dividing sequence to encrypt principle using pure pressure type is segmented from top to bottom
The synthetic jet grouting method combined with the pure pressure type slip casting of orifice closing is starched, grouting mode is " shallow layer foundation waterglass-sodium chloride list liquid
Silication "+" consolidation slip casting and deep foundation base cement-sodium silicate list liquid filling consolidation, compacting grouting "；
(5) injected hole closes mode: slip casting aperture and segmentation closing are all made of embolism closing, and plug diameter should be in bore diameter phase
It adapts to, embolism confining pressure is no less than 3.0Mpa；
5), terminate slip casting condition: (1) each slip casting section of segmenting slip casting terminates slip casting condition:
By field test, slip casting section terminates slip casting condition are as follows: 1. to curtain-grouting hole, under desired injection rate, each slip casting
The aperture grouting pressure of section reaches design pressure and maintains 10min, terminates this section of slip casting；2. being wanted to filling, consolidation injected hole
Under the injection rate asked, the aperture grouting pressure of each slip casting section reaches table design pressure and maintains 15min, terminates this section of slip casting；③
Away from range grout other than the 3.0m of slip casting aperture, terminate slip casting；4. all kinds of injected holes, under desired injection rate, when slip casting section
Aperture grouting pressure skyrockets, more than after table design pressure value, it is difficult to maintain to stablize, continue to rise, can directly terminate this section of slip casting；
(2) injected hole terminates slip casting condition and terminates slip casting post-treatment measure: each segmenting slip casting Duan Jun of injected hole reaches eventually
Only slip casting condition and slip casting is terminated, the last one slip casting section segmentation position has entered in orifice sleeve, then can terminate the hole slip casting；
After injected hole complete opening slip casting terminates, sealing of hole, method for sealing are as follows: after slip casting, usual complete opening has been filled are carried out to injected hole
Full slurry, can be directly in aperture section progress hole-sealing grouting processing；Grouting plug is arranged in aperture, continues injection hole sealing；
Pressure is typically no less than 1Mpa；
6), drilling construction: (1) injected hole drilling method: for the stabilization for keeping hole wall, prevent construction from the sedimentation of soil body row being caused to become
Shape preferably uses hidden hole drilling drilling, mud off drilling or casing follow-up drilling can also be used, but quasi- reinforcing note must not be isolated in casing
Starch section stratum；(2) injected hole hole structure: shallow bore hole opening diameter is not less than 90mm；Deep hole opening diameter is not less than 110mm, wears
After saturating shallow layer grouting layer, setting of casing, casing inner diameter is can ensure lower boreholes smooth construction as principle, and with cement slurry fluid-tight
The gap between casing and stratum is closed, φ 90mm bore drill bit is used instead and continues to creep into, until design hole depth；(3) drilling construction one
As require: boring aperture is φ 90mm- φ 150mm, and aperture need to complement one another with slip casting embolism, the hole location of drilling, depth, hole
Diameter, drilling sequences etc. should execute as required, and the deviation of hole location and design hole location is not greater than 30cm；(4) shallow layer drilling is constructed
It is required that: shallow layer drilling refers to the drilling for being mainly used for the hole depth of single liquid ihrigising in 0-8m；Shallow layer drilling answers one-step pore-creating, (5)
Deep layer hole construction requirement: deep layer drill refers to that hole depth reaches design drilling depth, the drilling of main nearly deep layer filling consolidation slip casting；
When deep layer drill is constructed, 6.0m, tripping in φ 110mm or so casing should be first crept into, and carry out at closing to casing and hole wall gap
Reason；After casing and the closing of hole wall gap reach intensity requirement, deep well drilling is carried out, until design hole depth, drilling meet cave, collapse
When hole or chip off-falling are difficult to creep into, injecting treatment, then row drilling can be carried out, such as discovery concentrates gas leakage (water) or water burst, should find out feelings
Condition, analysis reason, row is crept into again after processing；Injected hole (section) is after drilling, Ying Jinhang bore flushing, bottom hole deposition of thick
Degree must not exceed the 2.0% of design hole depth, be verified by engineering practice, can guarantee to be completed factory using above-mentioned grouting process
Grouting and consolidation on foundation quality.
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