CN205530218U - Slip casting composite foundation suitable for high -rise building structural strengthening is rectified - Google Patents

Abstract

The utility model discloses a slip casting composite foundation suitable for high -rise building structural strengthening is rectified, the composite foundation includes pre -buried slip casting steel pipe, the slip casting steel pipe is a slip casting spray of molten steel pipe, the bottom of slip casting spray of molten steel pipe is the shrink form, the pipe wall top -down of slip casting spray of molten steel pipe has seted up a plurality of whitewashing holes, slip casting spray of molten steel pipe cartridge is in drilling, bottom plate structural layer from the basement extends the pan soil layer downwards, slip casting spray of molten steel pipe is through static pressure slip casting injected water mud, grout cement stake in the formation in slip casting flower steel pipe of injecting into, the grout that pours into into is through whitewashing the hole along slip casting spray of molten steel pipe diameter to the injection, cement stake outside the clearance formation between slip casting spray of molten steel outside of tubes wall and drilling, and grout along the drilling radial diffusion through whitewashing hole injection, combine together with the soil body, form the root form cement netted veins body. This composite foundation can increase reinforcement engineering 's safety reliability.

Description

A kind of slip casting composite foundation being applicable to high building structure reinforcement and rectification

Technical field

This utility model relates to the ground in building structure, specifically refers to one and is applicable to high building structure reinforcing The slip casting composite foundation of correction.

Background technology

Certain engineering works eleventh floor, basement one layer, it is distributed in East and West direction, basement buried depth about 3.50～4.00m Deeply.Using subsoil mat foundation (base plate thickness 400mm), under substrate, foundation soil is mainly soft～plastic shape (mark Pass through and hit several N=3～7 and hit, fak=100～200kPa) farinose argillic horizon, the building centre of form and center of gravity exist the most inclined Heart phenomenon, adds that bearing capacity of foundation slab value differs greatly, and obvious nonuniform settlement, south occurs in building basis North orientation differential settlement 60.6～87.8mm, East and West direction 112.1～139.3mm.Therefore, it is necessary to carry out foundation stabilization tune Whole so that it is sedimentation difference reaches design and specification allowed band.

Utility model content

The purpose of this utility model is to provide a kind of compound ground of slip casting being applicable to high building structure reinforcement and rectification Base, this composite foundation forms the small-sized pile foundation of tree root shape by pre-buried slip casting injecting grout through steel perforated pipe, to increase reinforcing engineering Safety reliability, select to carry out grouting and reinforcing simultaneously after basement engineering completes, having upper load effect Under, grouting pressure and dilation angle can be improved, and under grouting pressure effect, make basis plate produce on appropriate Lift, play pre-settlement action, thus reach the purpose of reinforcement and rectification building structure.

Above-mentioned purpose of the present utility model realizes by following technical solution: one is applicable to skyscraper knot The slip casting composite foundation of structure reinforcement and rectification, described composite foundation includes being embedded in building structure basement ground earth boring auger Slip casting steel pipe in hole, boring extends substantially downward to the hard stratum of foundation soil, it is characterised in that: described slip casting steel pipe is Slip casting steel floral tube, the bottom of slip casting steel floral tube is contraction-like, and the tube wall of slip casting steel floral tube offers many from top to bottom Individual gunniting hole, described slip casting flower steel pipe is inserted in described boring, extends substantially downward to from the base arrangement layer of basement Described hard stratum, described slip casting steel floral tube injects cement mortar by static pressure grouting, and the cement mortar of injection is in slip casting Concrete stake in being formed in steel floral tube, the cement mortar of injection, is being noted along slip casting steel floral tube radial spray by gunniting hole Gap between slurry steel floral tube outer wall and boring forms outer concrete stake, and the cement mortar edge sprayed by gunniting hole Boring radial diffusion, combines with the soil body, forms tree root shape cement netted veins body, described slip casting steel floral tube, Interior concrete stake, outer concrete stake and tree root shape cement netted veins body are the full tree being poured composition by static pressure grouting The small-sized pile body of root shape, multiple described composite foundations described in overall tree root shape small-sized pile bodies composition, to reach to add The purpose of building structure admittedly rectify a deviation.

This utility model uses adjustability static pressure grouting to form tree root shape mini pile Scheme of Strengthening, i.e. notes at former static pressure Retain slip casting steel pipe on slurry underpinning and form the small-sized pile foundation of tree root shape, constitute composite foundation, reinforce work to increase The safety reliability of journey, selects to carry out grouting and reinforcing simultaneously after basement engineering completes, makees there being upper load Under with, grouting pressure and dilation angle can be improved, and under grouting pressure effect, make basis plate produce appropriate On lift, play pre-settlement action, this reinforcement means has and facilitates simple and direct, Tong Bu can carry out with civil engineering, work Effect height, low cost and other advantages, and the differential settlement of building according to information system management, can be regulated in time, increase Add the stability in the large of building.

Static pressure grouting forms tree root shape miniature pile foundation compacted soil layer mechanism system and uses cement grouting material, it would however also be possible to employ all Such as the chemical sizwe of double-component macromolecule polyurethane material, by Grouting Pipe under pressure, serosity overcomes soil The primary stress of layer, causes destruction and the disturbance of soil structures so that it is along being perpendicular in the plane of little stress generation Splitting, makes crack that formation crude has or hole open, forms new crack or hole, the concrete castability of serosity and Diffusion length increases, and serosity is sufficiently injected in the soil body to be reinforced, and is cleaved by serosity, extrudes in the soil body With the mechanism of action such as infiltration, make the cement mortar of high concentration fully be combined with the soil body, form the water with higher-strength Earth solid and tree root shape cement netted veins body；It is formed about slurry bubble in boring, along with the increasing of grouting pressure simultaneously Greatly, slurry bubble size is also gradually increased, grouting pressure along the radial expansion of boring, just produce bigger upper lifting force and Making ground lift, the most substantially there is elastic deformation in syneresis bubble soil farther out, thus the density of soil has significantly Increase so that it is intensity improves；It addition, use slip casting injecting grout through steel perforated pipe, and retain in soil, make cement mortar in pressure By chimney filter eyelet to surrounding injection diffusion under the driving of power, make slip casting steel floral tube and soil-cement body and tree root shape water Mud net tense pulse is close is coupled to one, forms small-sized pile body, by the small-sized pile body of this tree root shape and the cement stabilization soil body Constitute composite foundation, to reach the purpose of strengthening soft foundation.

Slip casting in this utility model and grouting, for constructed, have identical implication.

In this utility model, the pre-buried degree of depth of described slip casting steel floral tube is 6.0m～7.0m.

In this utility model, described boring is injected hole, and described boring is multiple, and multiple borings are lattice-like Uniform, spacing 1.5m between adjacent boring～2.0m, the drilling diameter of boring is 91～110mm, described φ 60 steel pipe that slip casting steel floral tube uses external diameter to be 60mm, thickness of pipe wall is 2～3mm, and described slip casting steel floral tube exists Position higher than basement bed course 0.30m is provided with sealing epoxy resin mortar, sealing epoxy resin mortar and slip casting steel floral tube and Concrete tight bond, the mouth of pipe of slip casting steel floral tube opens screw thread adjunction pipe box and filler block, and the aperture of described gunniting hole is 8～12mm, the difference in height between upper and lower gunniting hole is 0.5～0.8m.

This utility model grouting borehole design arranges that principle is as follows: each injected hole is spaced about 1.5 (when strengthening correction amount Use)～2.0m, uniform in web strip shape, injected hole drilling diameter 91～110mm, it is deep to plastic inclined pan soil Layer；According to Theoretical Calculation and construction experience analysis, slip casting affects effective radius about 1.0m.Injected hole divides two classes, One class system estimates that differential settlement is relatively big, needs the injected hole that early stage grouting and reinforcing processes；Occur relatively for the later stage if another kind of Big differential settlement and need the deposit hole that grouting and reinforcing processes.When building stability is not required to deposit hole is carried out grouting and reinforcing Time, it is necessary to carry out injection hole sealing, prevent from leaking.

In this utility model, described slip casting steel floral tube is being positioned at below gunniting hole and near gunniting hole position one side Be welded with a block length L be 3～5cm, thick t be 3～4mm the agnail that formed of angle steel, strengthen slip casting steel floral tube Adhesion.

Compared with prior art, this utility model has a following remarkable result:

(1) this utility model static pressure grouting formed tree root shape miniature pile foundation compacted soil layer make the cement mortar of high concentration with The soil body fully combines, and forms soil cement solid and the tree root shape cement netted veins body with higher-strength；

(2) this utility model is formed about slurry bubble in boring, and grouting pressure produces bigger upper lifting force and makes ground Lifting, the density of soil has significantly increase, and intensity improves；

(3) this utility model uses slip casting injecting grout through steel perforated pipe, and retains in soil, makes slip casting steel floral tube and soil cement Body and close being coupled to of tree root shape cement net tense pulse integrally, form small-sized pile body.The small-sized pile body of this tree root shape and water Mud soil mass consolidation constitutes composite foundation, to reach the purpose of strengthening soft foundation.

(4) this utility model is under grouting pressure effect, makes basis plate produce on appropriate and lifts, regulates building Differential settlement.

Accompanying drawing explanation

With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.

Fig. 1 is this utility model pre-buried slip casting be applicable to the slip casting composite foundation of high building structure reinforcement and rectification The structural representation of flower steel pipe；

Fig. 2 is this utility model grouting and reinforcing be applicable to the slip casting composite foundation of high building structure reinforcement and rectification Schematic cross-sectional view；

Fig. 3 is this utility model grouting and reinforcing be applicable to the slip casting composite foundation of high building structure reinforcement and rectification Principle and stress sectional view；

Fig. 4 is this utility model grouting and reinforcing be applicable to the slip casting composite foundation of high building structure reinforcement and rectification Cloth hole plane graph；

Fig. 5 is this utility model slip casting flower steel be applicable to the slip casting composite foundation of high building structure reinforcement and rectification The structural representation of pipe.

Description of reference numerals

1 basement building coats, 2 base arrangement layers, 3 basement bed courses, 4 borings,

5 slip casting flower steel pipes, 51 gunniting holes, 52 agnails, 6 sealing epoxy resin mortars,

7 sealing of hole cement mortar, 8 hard stratums, 9 basements, 10 lifting means,

11 tree root shape cement netted veins bodies, 12 grouting pumps, 13 level gauges.

Detailed description of the invention

A kind of slip casting composite foundation such as Fig. 1 to Fig. 5 being applicable to high building structure reinforcement and rectification of this utility model Shown in, the bottom of basement 9 is respectively basement building coats 1, base arrangement layer 2 and basement from top to down Bed course 3, the lower section of foundation soil room located underground bed course 3, composite foundation includes being embedded in building structure basement ground Slip casting steel pipe in base earth boring auger hole 4, boring 4 drills through the bottom of basement 9 and bores to foundation soil, boring 4 to Under extend the hard stratum 8 of foundation soil, slip casting steel pipe is slip casting steel floral tube 5, and the bottom of slip casting steel floral tube 5 is contraction Shape, the tube wall of slip casting steel floral tube 5 offers multiple gunniting hole 51 from top to bottom, and slip casting steel floral tube 5 is inserted into brill In hole 4, extend substantially downward to hard stratum 8 from the base arrangement layer 2 of basement 9.

Slip casting steel floral tube 5 injects cement mortar by static pressure grouting, and the cement mortar of injection is shape in slip casting steel floral tube 5 Become in concrete stake, the cement mortar of injection by gunniting hole 51 along slip casting steel floral tube 5 radial spray, at the slip casting spray of molten steel Gap between pipe 5 outer wall and boring 4 forms outer concrete stake, and the cement mortar edge sprayed by gunniting hole 51 Hole 4 radial diffusion, combine with the soil body, form tree root shape cement netted veins body 11, slip casting steel floral tube 5, Interior concrete stake, outer concrete stake and tree root shape cement netted veins body 11 are the entirety being poured composition by static pressure grouting The small-sized pile body of tree root shape, multiple overall small-sized pile bodies of tree root shape constitute composite foundation, to reach reinforcement and rectification building The purpose of structure.

Boring 4 in the present embodiment is injected hole, and boring 4 is multiple, and multiple borings 4 are uniform in lattice-like, Spacing 1.8m between adjacent boring 4, the drilling diameter of boring 4 is 100mm, slip casting steel floral tube 5 pre-buried The degree of depth is 6.5m, and φ 60 steel pipe that slip casting steel floral tube 5 uses external diameter to be 60mm, thickness of pipe wall is 3mm, slip casting Steel floral tube 5 is being provided with sealing epoxy resin mortar 6, seal ring higher than the position that basement bed course 3 difference in height is 0.30m Oxygen mortar 6 is superposed sealing epoxy resin mortar and is positioned at the 30mm below sealing epoxy resin mortar The assembly of thick expanded rubber sealing rod composition, sealing epoxy resin mortar 6 and slip casting steel floral tube 5 and concrete tight bond, The mouth of pipe of slip casting steel floral tube 5 opens screw thread adjunction pipe box and filler block, and the aperture of gunniting hole 51 is 10mm, up and down Difference in height between gunniting hole 51 is 0.6m, and boring 4 is being positioned at the one of the colored steel pipe 5 of collar slip casting bottom basement Intersegmental gap is also filled with sealing of hole cement mortar 7.

Slip casting steel floral tube 5 is being positioned at below gunniting hole 51 and is being connected to one piece near gunniting hole 51 position single welding The agnail 52 that the angle steel that long L is 4cm, thick t is 3mm is formed, strengthens the adhesion of slip casting steel floral tube 5.

As the conversion of the present embodiment, the spacing between adjacent boring 4 can in the range of 1.5m～2.0m value, Boring 4 drilling diameter can in the range of 91～110mm value, the pre-buried degree of depth of slip casting steel floral tube 5 is permissible Value in the range of 6.0m～7.0m, slip casting flower steel pipe 5 thickness of pipe wall can in the range of 2～3mm value.、

As the conversion of the present embodiment, the aperture of gunniting hole 51 can in the range of 8～12mm value, up and down Difference in height between gunniting hole 51 can also in the range of 0.5～0.8m value.

As the conversion of the present embodiment, the long L of agnail 52 can in the range of 3～5cm value, thick t is permissible Value in the range of 3～4mm.

The construction method of the above-mentioned slip casting composite foundation being applicable to high building structure reinforcement and rectification, the method includes Following steps:

(1) pore-forming: the on-the-spot measuring point position needed reinforcement according to building structure, uses drilling machine to basement 9 ground Base earth boring auger hole 4 carries out pore-forming, and the drilling diameter of boring 4 is 100mm, and boring 4 extends substantially downward to the hard of foundation soil Soil layer 8；

(2) pipe laying: use hammering or hole forming method, slip casting steel floral tube 5 is inserted in the boring 4 become, slip casting steel The pre-buried degree of depth of floral tube 5 is 6.5m, φ 60 steel pipe that slip casting steel floral tube 5 uses external diameter to be 60mm, thickness of pipe wall For 3mm, the tube wall of slip casting steel floral tube 5 offers multiple gunniting hole 51, the aperture of gunniting hole 51 from top to bottom For 10mm, the difference in height between upper and lower gunniting hole 51 is 0.6m, and slip casting steel floral tube 5 is higher than basement bed course 3 differences in height are that the position of 0.30m sets sealing epoxy resin mortar 6, sealing epoxy resin mortar 6 and slip casting steel floral tube 5 and concrete Tight bond, the mouth of pipe of slip casting steel floral tube 5 is opened screw thread adjunction pipe box and filler block, is protected silk mouth and prevent foreign material Falling in pipe, pipe laying to spud in after hole 4 completes at basement 9 base arrangement layer 2 concrete and to carry out, and holes 4 mouthfuls and wants Element concrete is closed, and blocking boring 4 when preventing from smashing concrete, boring 4 is injected hole；

(3) hole flushing and static pressure grouting: slip casting steel floral tube 5 is connected grouting pump 12 by slip casting sebific duct, starts slip casting Pump 12, first with after clear water, use cement mortar hole flushing is at the bottom of slip casting steel floral tube 5 pipe, until slip casting steel floral tube 5 mouth of pipe emits Till going out cement mortar, then using cement mortar to carry out closure static pressure grouting, this closure static pressure grouting means note Require before slurry to carry out airtight to remaining all or near field adjacent pre-buried steel floral tube, slurry is pressed into lentamente In soil, estimate single-pipe grouting 0.7～1.3 tons of cement；

(4) voltage stabilizing controls: when grouting pressure increases, and grout absorption every meter of cement consumption per minute is less than or equal to 1kg, Keeping voltage stabilizing slip casting under grouting pump 0.6MPa pressure, voltage stabling control is 15min；

In this step, when grouting pressure increases, and when grout absorption is the least, now grouting pump also pressure can also keep In 0.3m～0.8MPa pressure limit, voltage stabling control can also control in the range of 10～20min；

(5) tear pipe open: voltage stabilizing slip casting complete or on basement 9 base arrangement layer 2 amount of lifting at the control model of reinforcement and rectification When enclosing interior, stop slip casting, the cement mortar of injection formed in slip casting steel floral tube 5 in concrete stake, the cement of injection Starch by gunniting hole 51 along slip casting steel floral tube 5 radial spray, between slip casting steel floral tube 5 outer wall and boring 4 Gap forms outer concrete stake, and cement mortar edge boring 4 radial diffusion sprayed by gunniting hole 51, with the soil body Combine, formed tree root shape cement netted veins body 11, slip casting steel floral tube 5, interior concrete stake, outer concrete stake and Tree root shape cement netted veins body 11 is the small-sized pile body of overall tree root shape being poured composition by static pressure grouting；

(6) discharge observation is lifted on basement 9 base arrangement layer 2: use level gauge 13 to observe base arrangement during slip casting Situation of change is lifted, by the amount of lifting in engineering requirement control on layer 2；

(7) rinse and shift: after single hole slip casting, rinsing slip casting sebific duct with clear water, in case blocking in pipe, adopting Changing hole slip casting by first outside and then inside, jumping position, hole mortar depositing construction order, it is little that each slip casting is respectively formed an overall tree root shape Type pile body, multiple overall small-sized pile bodies of tree root shape constitute composite foundation, to reach the mesh of reinforcement and rectification building structure 's.

Concrete engineering overview

Certain building altogether eleventh floor, B1, be distributed in East and West direction, buried depth 3.40m (northern) at the bottom of base plate～ 4.20m (southern), locally 5.70m, wide about 12.40～13.30m, building has bound and has been delivered for use.Subsoil Mat foundation, substrate soil is soft～plastic shape silty clay, and design requires foundation bearing force value standard value Fak=140kPa.The overhanging sunken garden in building southern side, the centre of form and center of gravity are the most eccentric, substrate ground Soil (2. soil layer) Standard penetration test blow count N=3～7 hit, compression modulus Es=3.38～11.74MPa, fak=115～ 225kPa, and there is larger difference in bearing capacity of foundation slab, has there is obvious differential settlement and has inclined in building basis Tiltedly phenomenon, north-south differential settlement 60.6～87.8mm, East and West direction 112.1～139.3mm.Building binds, Though settling amount is the most not very big, but the rate of settling significantly increases in the recent period, and differential settlement is obvious, has the most northwestwards Tilt phenomenon, have to carry out settlement control process for some reason in time, must exist the most flabbily under substrate Base soil section, pre-buried slip casting steel floral tube, slip casting steel floral tube buried depth about 6.0～7.0m.

Though foundation reinforcement method is a lot of the most both at home and abroad, but with regard to this place foundation soil (soft～plastic shape (SPT blow count N=3～7 hits, fak=100～200kPa) farinose argillic horizon) soil property, the construction period and construction feasibility (warp Ji, technology) comprehensively analyze, preferably go out adjustability static pressure grouting and form tree root shape mini pile Scheme of Strengthening, i.e. exist Retain slip casting steel pipe on former static pressure grouting underpinning and form the small-sized pile foundation of tree root shape, constitute composite foundation, to increase Add the safety reliability of reinforcing engineering, select to carry out grouting and reinforcing after basement engineering completes, simultaneously on having Under portion's load action, grouting pressure and dilation angle can be improved, and under grouting pressure effect, make basis plate Producing and lift on appropriate, play pre-settlement action, this reinforcement means has and facilitates simple and direct, Tong Bu can carry out with civil engineering, Work efficiency is high, low cost and other advantages, and according to information system management, can regulate the differential settlement of building in time, Increase the stability in the large of building.

Owing to this engineering locally lies in single one layer basement, there is bigger diversity in building structure, is anti- Only there is the situation that on local, the amount of lifting is bigger than normal in grouting and reinforcing process, in conjunction with reinforcing requirement, drafts following construction Technical measures.

(1) the locally excessive reason of settling amount:

Main cause: because basement southern side base plate buried depth and overhanging area are big, and north side base plate buried depth is shallow and overhanging Area is little, and the additional stress suffered by substrate foundation soil is that little north side, southern side is big, when foundation soil occurs that local soil property is inclined Soft, when bearing capacity difference is big, compress variation doubles, and causes relative settlement excessive, and building inclination degree exceeds Code requirement.

Other reason: the building centre of form is misaligned with center of gravity, there is eccentric phenomena the most northwards, adds that north side blinding adds The big additional stress etc. of the substrate soil body, increases settling amount further.

(2) reinforce and correction scheme

Owing to structure construction is complete, building occurs.

A, by substrate foundation soil body being carried out the reinforcement effect of static pressure cement injection and chemical pulp, improve former foundation soil Bearing capacity.

B, reservation steel floral tube, in foundation soil, form the effect of miniature tree root steel-pipe pile by slip casting, improve former further The bearing capacity of foundation soil,

The additional stress of foundation soil can be reduced simultaneously, reduce the compression of foundation soil, better control over sedimentation and deformation.

C, improve the bearing capacity of the soil body under base plate by adding adjustability built-in pipe slip casting, and control the uneven heavy of building Fall.

D, by slurry splitting extruding and rapid hardening splash rise on lift effect, play rectifying of leaned building effect.

1. cloth hole principle: injected hole is away from cushion cap or grade beam limit >=600mm, hole horizontal spacing 1.8～2.0m；

2. injected hole pore-forming pipe laying is deep to plastic inclined hard stratum, if can shift or adopt when meeting hard barrier at the bottom of bed course With rig pore-forming built-in pipe, require direct weight impacting method built-in pipe in principle.

3. grouting and reinforcing construction process requirement carries out pressure, grouting amount and slip casting by built-in pipe adjustability slurry injection technique On the amount of lifting carry out informationization monitoring.

4. adjustability grouting and reinforcing control building settlement difference must is fulfilled for design and code requirement.

5. the strength grade of concrete thickening base plate is C30, and anti-permeability strength grade is S8.

(3) adjustability built-in pipe grouting and reinforcing construction technology explanation:

1, complete because of basement bottom board, thus first use diameter 91 diamond bit rig pore-forming at the bottom of bed course, Then weight is used to be driven into by the steel floral tube being processed into the 60*3.2 of reversed acanthoid to the plastic inclined hard stratum of holding force or when difficulty Hit into time can whole hole, estimate deep about 6.0～about 7.0m (base surface meter rises) of pipe laying.

2, underplate concrete structural sections is by full-page proof requirement sealing of hole.

3, for guaranteeing strengthening quality, the construction of adjustability built-in pipe grouting and reinforcing by being familiar with grouting process and must have class Constructing like the professional unit having qualification of reinforcing engineering experience, arrangement and method for construction must be through design and supervision & assessment accreditation After can implement.

4, injecting cement paste uses 42.5R cement to press the ratio of mud about 0.6 preparation neat slurry and appropriate chemistry of cement slurry, Use low pressure flood irrigation method to carry out slip casting, slurry suitably adds early strength agent.

5, according to design pressure, partial pressure section jumps hole closure slip casting in batches, it is desirable to control diffusion by geological condition Scope, is pre-designed single hole and controls grouting amount, when grouting pressure cannot promote, it is necessary to use chemistry of cement slurry Perfusion.Slip casting requires first outside and then inside, and burst is distinguished and dissipated low pressure flood irrigation slip casting by several times.

6, require to control base plate total on the amount of lifting≤50～60mm, when single hole slip casting produce on the amount of lifting reach code requirement During value, slip casting to be stopped.

7, during grouting and reinforcing construction, it is necessary to monitored by measurement, accomplish information-aided construction.

8, this Scheme of Strengthening purpose is to be improved the intensity of bearing stratum by fracture grouting effect, simultaneously by allotment Grouting pressure, regulates the sedimentation of building, makes the settling amount being reinforced building control in design and specification and wants In the range of asking.

(4) grouting pressure controls:

The control of pressure during slip casting, should carry out under design required pressure, take low pressure flood irrigation mode to enter Row slip casting, when grouting amount relatively greatly but not up to designs required pressure, occurs if any " running pulp " " grout " phenomenon, Should take measures to process, i.e. in slurry, mix chemical grout process or batch (-type) grouting method carries out slip casting, Slip casting is suspended, it is ensured that slip casting terminates under design required pressure before serosity initial set.

(5) grouting amount controls:

Run off for going out running pulp during avoiding slip casting, cause waste of material, be as the criterion with arrangement and method for construction technical parameter, Work progress combines drilling data and pipe laying depth data is carried out, to guarantee to reach to design requirement, before construction, With reference to early stage data, geology weakness band is carried out special handling, precalculate every pipe required for cement pour into Amount, in work progress, as found in observation, the Uplifting amount of single hole is zero, as reached again required cement amount, Also can terminate slip casting, then other pipes be carried out slip casting, as single hole Uplifting amount meets construction requirement, i.e. to jump filling method Carve and this hole is terminated slip casting, simultaneously on the basis of final total upper Uplifting amount, carry out the construction of total amount holistic science.

(6) deformation observation and monitoring:

Taking net, some monitoring, constitute an observation and control network, outside the building plinth sets up stably measured basic point, Bury multiple observation station at basement periphery and center, see and control point as bulk deformation, and set up single hole to lift Rising amount observation station (i.e. injected hole is adjacent to post position), carries out the integral monitoring of work progress, arranges special messenger in slip casting simultaneously During to building periphery earth's surface and the observation of close to buildings, ensure construction of structures structure and adjacent buildings Safe and the most stable, accomplish information-aided construction.

Mortar depositing construction order and process control needs

For preventing grouting and reinforcing process from the situation that on local, the amount of lifting is bigger than normal occurring, add by requiring in conjunction with reinforcement, draft Following technology measure:

1, combine the distribution situation of building and built-in pipe, take first outside and then inside, jump hole mortar depositing construction order, choosing Taking design calculating radical built-in pipe and carry out grouting and reinforcing process, remaining built-in pipe is used as deposit, notes when the first phase Slurry amount and on the amount of lifting when reaching design and construction Expected Results, reserve tube can be carried out sealing and block up grave and process.

2, the control of pressure during slip casting, substantially should by the amount of lifting control to carry out, on rank under required pressure In section property work progress, it is necessary to combine upper load amount, boundary condition and the deformation that produced put carry out selecting suitable When grouting pressure, take low pressure flood irrigation mode to carry out slip casting, when grouting amount is relatively big but not up to design requires During pressure, analyze and check whether appearance " running pulp " or grout phenomenon, and take stifled slurry measure to process, i.e. exist Slurry mixes chemical grout play rapid hardening process or use batch (-type) grouting method to carry out slip casting, control the expansion of serosity The scope of dissipating, makes serosity uniformly cleave diffusion in the range of needing the soil body of consolidation process, it is ensured that card slip casting effect.

3, every hole that " blocks hole " pours into cement amount and is not more than 200kg；" reinforced hole " pours into cement amount about 1000kg Left and right.Run off for going out running pulp body " running pulp " during avoiding slip casting, be directed at waste material, during slip casting, As observed after discovery all irrigates by predetermined single tube (hole) the cement amount of pouring into, and the Uplifting amount of slip casting point position is zero Time, also terminate slip casting, then to jump filling method, other pipes are carried out slip casting；Though as single hole Pu slurry amount does not reaches predetermined control Amount, but produced rising amount of picking up has chosen Construction control when requiring, at once terminates slip casting, the most also to control each Produced by injected hole, accumulative beginning rising amount is in maximum control in the amount of lifting, and carries out dual control mortar depositing construction management.

4, grouting quality controls

(1), first understand distribution and the buried depth of building underground blowdown pipeline before construction, prevent injecting cement paste from entering Pipeline；

(2), the materials such as cement are tested qualified after just can use；

(3), slip casting work must be responsible for by professional and technical personnel, and operated by skilled worker, must adopt during construction Take low pressure flood irrigation technology to carry out, prevent grouting pressure excessive or enter to starch too fast " running pulp " phenomenon that causes, thus on lift change Shape is excessive.

(4), itemized record each slip casting point enter slurry situation and pressure, and according to grouting amount and on the amount of lifting and adjust note Slurry pressure.

Detection of grouting effects and settlement monitoring

The purpose of static pressure grouting reinforcing body is intended to improve the bearing capacity of the foundation soil being reinforced and change the compression of soil layer Property (deformation modulus), and belong to disguised engineering construction, after basis plate completes, carry out consolidation process especially, Constitute composite foundation, it is impossible to the method for inspection is carried out routinely, therefore can be by overall grouting pressure, grouting amount, the end On plate, the amount of lifting and settlement of building carry out overall merit grouting consolidation effect, and strengthen the information-based pipe of work progress Reason, makes building bulk settling Deformation control in the range of specification permissible value.

It is in the mat foundation on high-compressibility subsoil, when structure foundation soil bearing capacity value differs greatly, When there is obvious nonuniform settlement in subsoil mat foundation, it is necessary to carry out settlement control process in time, Must reinforce there is relative weak foundation soil location under substrate.

Adjustability built-in pipe grouting and reinforcing of the present utility model and deviation correcting technology use adjustability static pressure grouting to form tree Root shape mini pile Scheme of Strengthening, i.e. retains slip casting steel pipe formation tree root shape small-sized on former static pressure grouting underpinning Pile foundation, constitutes composite foundation, to increase the safety reliability of reinforcing engineering, may select at basement engineering simultaneously Carry out grouting and reinforcing after completing, under having upper load effect, grouting pressure and dilation angle can be improved, and Under grouting pressure effect, making basis plate produce on appropriate and lift, play pre-settlement action, this reinforcement means has Facilitating simple and direct, Tong Bu can carry out with civil engineering, work efficiency is high, low cost and other advantages, and can according to information system management, Regulate the differential settlement of building in time, increase the stability in the large of building.

Above-described embodiment of the present utility model is not the restriction to this utility model protection domain, this utility model Embodiment be not limited to this, all this kind is according to foregoing of the present utility model, common according to this area Technological know-how and customary means, without departing under this utility model above-mentioned basic fundamental thought premise, to this practicality The amendment of other various ways that novel said structure is made, replace or change, all should fall of the present utility model Within protection domain.

Claims (4)

1. being applicable to a slip casting composite foundation for high building structure reinforcement and rectification, described composite foundation includes pre- Being embedded in the slip casting steel pipe in the boring of building structure basement foundation soil, boring extends substantially downward to the hard stratum of foundation soil, It is characterized in that: described slip casting steel pipe is slip casting steel floral tube, the bottom of slip casting steel floral tube is contraction-like, slip casting steel The tube wall of floral tube offers multiple gunniting hole from top to bottom, and described slip casting steel floral tube is inserted in described boring, from The base arrangement layer of basement extends substantially downward to described hard stratum, and described slip casting steel floral tube is injected by static pressure grouting Cement mortar, the cement mortar of injection formed in slip casting steel floral tube in concrete stake, the cement mortar of injection passes through gunniting hole Along slip casting steel floral tube radial spray, the gap between slip casting steel floral tube outer wall and boring forms outer concrete stake, and And by the cement mortar edge boring radial diffusion that gunniting hole sprays, combine with the soil body, form tree root shape cement net Shape arteries and veins body, described slip casting steel floral tube, interior concrete stake, outer concrete stake and tree root shape cement netted veins body are logical Cross static pressure grouting and pour the small-sized pile body of overall tree root shape of composition, multiple described overall tree root shape small-sized pile body structures Composite foundation described in one-tenth, to reach the purpose of reinforcement and rectification building structure.

The slip casting composite foundation being applicable to high building structure reinforcement and rectification the most according to claim 1, its It is characterised by: the pre-buried degree of depth of described slip casting steel floral tube is 6.0m～7.0m.

A kind of compound ground of slip casting being applicable to high building structure reinforcement and rectification the most according to claim 2 Base, it is characterised in that: described boring is injected hole, and described boring is multiple, and multiple borings are that lattice-like is equal Cloth, spacing 1.5m between adjacent boring～2.0m, the drilling diameter of boring is 91～110mm, described note φ 60 steel pipe that slurry steel floral tube uses external diameter to be 60mm, thickness of pipe wall is 2～3mm, and described slip casting steel floral tube is at height Sealing epoxy resin mortar, sealing epoxy resin mortar and slip casting steel floral tube and concrete it is provided with in the position of basement bed course 0.30m Tight bond, the mouth of pipe of slip casting steel floral tube opens screw thread adjunction pipe box and filler block, the aperture of described gunniting hole be 8～ 12mm, the difference in height between upper and lower gunniting hole is 0.5～0.8m.

The slip casting composite foundation being applicable to high building structure reinforcement and rectification the most according to claim 3, its It is characterised by: described slip casting steel floral tube is being positioned at below gunniting hole and is being connected to one near gunniting hole position single welding The agnail that the angle steel that block length L is 3～5cm, thick t is 3～4mm is formed, strengthens the adhesion of slip casting steel floral tube.