CN205172598U - Pipe curtain spouts a supporting construction soon - Google Patents
Pipe curtain spouts a supporting construction soon Download PDFInfo
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- CN205172598U CN205172598U CN201521048737.7U CN201521048737U CN205172598U CN 205172598 U CN205172598 U CN 205172598U CN 201521048737 U CN201521048737 U CN 201521048737U CN 205172598 U CN205172598 U CN 205172598U
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Abstract
The utility model discloses a pipe curtain spouts a supporting construction soon, including a plurality of pipes act steel pipe, all be provided with at least one level between per two pipe curtain steel pipes and spout the stake soon, just the marginal in close contact with of stake is spouted soon to pipe curtain steel pipe and level, manages act steel pipe and spouts the stake atress system of strutting jointly of the big rigidity of combination formation together soon with the level. The utility model discloses a to manage an act steel pipe and strut form and level and spout the stake soon and strut the form and make up, and form big rigidity water proofness pipe curtain spouts a supporting construction soon, construction and operation safety are guaranteed in loss that can effective control groundwater, are particularly suitable for burying the supporting construction when wearing sensitive construction under the big section underground structure as saturation rich water weak soil stratum shallow.
Description
Technical field
The utility model relates to a kind of brick or concrete duct, especially a kind of pipe curtain rotary churning pile supporting and protection structure.
Background technology
Along with the acceleration of Urbanization Process In China, under downtown roads or important building, build Large Underground Structure get more and more.For shallow embedding big cross section, short-range city tunnel, adopt shield construction uneconomical, adopt cut and cover method larger to the interference of city productive life.When geological conditions is poor, buried depth is more shallow, top is when having a Sensitive Buildings, if adopt shallow burial hidden digging construction, surface settlement is difficult to control, once there is construction accident, will cause significant social influence.Therefore, how to find a kind of be suitable for the shallow large-section underground structure of saturated rich water soft soil layer under to wear the construction method of Sensitive Buildings extremely important.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, a kind of pipe curtain rotary churning pile supporting and protection structure is provided, pipe curtain steel pipe is protected form and horizontal jet grouting stake support form combines, form large rigidity watertightness pipe curtain rotary churning pile supporting and protection structure, effectively can control the loss of underground water, ensure construction and operation security, under being particularly suitable as the shallow large-section underground structure of saturated rich water soft soil layer, wear supporting and protection structure during Sensitive Buildings construction.
For achieving the above object, the utility model adopts following technical proposals:
A kind of pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes, at least one horizontal jet grouting stake is provided with between every two pipe curtain steel pipes, and pipe curtain steel pipe contacts with the edges close of horizontal jet grouting stake, pipe curtain steel pipe is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake.
Be provided with the horizontal jet grouting stake of two next-door neighbours between every two pipe curtain steel pipes, the edges close contact of the horizontal jet grouting stake of every two next-door neighbours, can play effective sealing effect.
The horizontal jet grouting stake more than two next-door neighbours is provided with between every two pipe curtain steel pipes, and the edges close contact of the horizontal jet grouting stake of every two next-door neighbours, effective sealing effect can be played.
A kind of pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes, at least one horizontal jet grouting stake is provided with between every two pipe curtain steel pipes, and pipe curtain steel pipe contacts with the edges close of horizontal jet grouting stake, be filled with concrete in part pipe curtain steel pipe, pipe curtain steel pipe is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake.
Be provided with the horizontal jet grouting stake of two next-door neighbours between every two pipe curtain steel pipes, the edges close contact of the horizontal jet grouting stake of every two next-door neighbours, can play effective sealing effect.
The horizontal jet grouting stake more than two next-door neighbours is provided with between every two pipe curtain steel pipes, and the edges close contact of the horizontal jet grouting stake of every two next-door neighbours, effective sealing effect can be played.
The pipe curtain steel pipe interval being filled with concrete pipe curtain steel pipe and non-fill concrete is arranged, and effectively can increase the intensity of whole pipe curtain rotary churning pile supporting and protection structure.
A kind of pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes, at least one horizontal jet grouting stake is provided with between every two pipe curtain steel pipes, and pipe curtain steel pipe contacts with the edges close of horizontal jet grouting stake, all be filled with concrete in described pipe curtain steel pipe, pipe curtain steel pipe is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake.
Be provided with the horizontal jet grouting stake of two next-door neighbours between every two pipe curtain steel pipes, the edges close contact of the horizontal jet grouting stake of every two next-door neighbours, can play effective sealing effect.
The horizontal jet grouting stake more than two next-door neighbours is provided with between every two pipe curtain steel pipes, and the edges close contact of the horizontal jet grouting stake of every two next-door neighbours, effective sealing effect can be played.
Described pipe curtain diameter of steel tube is 0.3m-2m, also can select larger diameter according to concrete engineering situation.The steel pipe of different-diameter is selected according to different actual demands.
The arrangements of described pipe curtain rotary churning pile supporting and protection structure is circular, rectangle or other arbitrary shapes, and concrete shape is determined according to the underground structure that will build.
The utility model is combined pipe curtain steel pipe support form and horizontal jet grouting stake support form, form large rigidity watertightness pipe curtain rotary churning pile supporting and protection structure, effectively can control the loss of underground water, ensure construction and operation security, under being particularly suitable as the shallow large-section underground structure of saturated rich water soft soil layer, wear supporting and protection structure during Sensitive Buildings construction.
Compared with existing pipe-roof method, the quantity of the utility model pipe curtain steel pipe can reduce in a large number, and the pipe curtain steel pipe support action of minimizing is replaced by horizontal jet grouting stake, can save the limit for a project and the cost; Compared with single horizontal jet grouting stake support form, greatly improve the rigidity of supporting and protection structure, effectively can control earth's surface distortion, safety is good.The utility model wears supporting and protection structure during Sensitive Buildings construction under being particularly suitable as the shallow large-section underground structure of saturated rich water soft soil layer.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment 1 structural representation;
Fig. 2 is the utility model embodiment 2 structural representation;
Fig. 3 is the utility model embodiment 3 structural representation;
Fig. 4 is the utility model embodiment 4 structural representation;
Fig. 5 is the utility model embodiment 5 structural representation;
Fig. 6 is the utility model embodiment 6 structural representation;
Fig. 7 is the construction flow chart using pipe curtain rotary churning pile supporting and protection structure to build underground construction;
Fig. 8 is pipe curtain steel pipe jacking construction process figure;
Fig. 9 is horizontal jet grouting pile driving construction flow chart;
Wherein 1. pipe curtain steel pipes, 2. horizontal jet grouting stake, 3. excavates portal, is 4. filled with concrete pipe curtain steel pipe.
Detailed description of the invention
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment 1
As shown in Figure 1, pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes 1, a horizontal jet grouting stake 2 is provided with between every two pipe curtain steel pipes 1, and pipe curtain steel pipe 1 contacts with the edges close of horizontal jet grouting stake 2, pipe curtain steel pipe 1 is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake 2.Pipe curtain steel pipe 1 diameter is 0.3m-2m.The arrangements of pipe curtain rotary churning pile supporting and protection structure is circular.
Embodiment 2:
As shown in Figure 2, pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes 1, a horizontal jet grouting stake 2 is provided with between every two pipe curtain steel pipes 1, and pipe curtain steel pipe 1 contacts with the edges close of horizontal jet grouting stake 2, pipe curtain steel pipe 1 is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake 2.Pipe curtain steel pipe 1 diameter is 0.3m-2m.The arrangements of pipe curtain rotary churning pile supporting and protection structure is orthogonal.
Embodiment 3:
As shown in Figure 3, pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes 1, a horizontal jet grouting stake 2 is provided with between every two pipe curtain steel pipes 1, and pipe curtain steel pipe 1 contacts with the edges close of horizontal jet grouting stake 2, be filled with concrete in part pipe curtain steel pipe, and the pipe curtain steel pipe interval being filled with concrete pipe curtain steel pipe 4 and non-fill concrete is arranged.Pipe curtain steel pipe 1 is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake 2.Pipe curtain steel pipe 1 diameter is 0.3m-2m.The arrangements of pipe curtain rotary churning pile supporting and protection structure is circular.
Embodiment 4:
As shown in Figure 4, pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes 1, a horizontal jet grouting stake 2 is provided with between every two pipe curtain steel pipes 1, and pipe curtain steel pipe 1 contacts with the edges close of horizontal jet grouting stake 2, be filled with concrete in part pipe curtain steel pipe, and the pipe curtain steel pipe interval being filled with concrete pipe curtain steel pipe 4 and non-fill concrete is arranged.Pipe curtain steel pipe 1 is combined to form the common supporting stress system of large rigidity together with horizontal jet grouting stake 2.Pipe curtain steel pipe 1 diameter is 0.3m-2m.The arrangements of pipe curtain rotary churning pile supporting and protection structure is orthogonal.
Embodiment 5:
As shown in Figure 5, pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes 1, a horizontal jet grouting stake 2 is provided with between every two pipe curtain steel pipes 1, and pipe curtain steel pipe 1 contacts with the edges close of horizontal jet grouting stake 2, all be filled with concrete in described pipe curtain steel pipe, be filled with the common supporting stress system that concrete pipe curtain steel pipe 4 is combined to form large rigidity together with horizontal jet grouting stake.Pipe curtain diameter of steel tube is 0.3m-2m.The arrangements of pipe curtain rotary churning pile supporting and protection structure is circular.
Embodiment 6:
As shown in Figure 6, pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes 1, a horizontal jet grouting stake 2 is provided with between every two pipe curtain steel pipes 1, and pipe curtain steel pipe 1 contacts with the edges close of horizontal jet grouting stake 2, all be filled with concrete in described pipe curtain steel pipe, be filled with the common supporting stress system that concrete pipe curtain steel pipe 4 is combined to form large rigidity together with horizontal jet grouting stake.Pipe curtain diameter of steel tube is 0.3m-2m.The arrangements of pipe curtain rotary churning pile supporting and protection structure is orthogonal.
Embodiment 7: with embodiment 1-6 unlike, be provided with between every two pipe curtain steel pipes two next-door neighbour horizontal jet grouting stakes 2, every two next-door neighbour horizontal jet grouting stakes 2 edges close contact.The different structure new relative to 6 kinds of the change of embodiment 1-6 structure is included in the present embodiment.
Embodiment 8: with embodiment 1-6 unlike, be provided with between every two pipe curtain steel pipes more than two next-door neighbour horizontal jet grouting stake 2, and every two next-door neighbour horizontal jet grouting stakes 2 edges close contact.The different structure new relative to 6 kinds of the change of embodiment 1-6 structure is included in the present embodiment.
Just know-why of the present utility model and constructure scheme, flow process are described in further detail below.
Pipe-roof method is exactly first utilize miniature pipe-jacking technology to head into steel pipe or other materials in the underground structure surrounding planned to build; adopt fore shaft to connect between steel pipe and inject waterproofing materials and carry out sealing; and form the watertightness underground space; then, under the protection of large rigidity pipe curtain, the scope soil body is surrounded to pipe curtain and excavates and build a kind of method of agent structure.
Pipe-roof method has following characteristics:
1, soft soil layer big cross section pipe-roof method build underground structure generally carries out under not having condition to take cut and cover method situation;
2, pipe-roof method build underground structure earthing is more shallow usually, needs to pass through responsive pipeline, road and structure, higher to the requirement of earth's surface distortion;
3, be applied to highway tunnel, the operating mode that cross dimensions is larger more;
4, pipe-roof method can select different concrete engineering methods according to different stratum, surrounding enviroment and cross dimensions, and namely pipe-roof method can derive many different pipe-roofing method;
5, the construction of pipe curtain should adopt pipe jacking method, because pipe jacking method can meet minimum earth's surface distortion, and higher attitude control accuracy.
The pipe-roofing method scope of application is comparatively wide, and from the external case history that oneself has, pipe-roofing method is applicable to the various stratum such as backfill, sand, clay, rock stratum, has broad application prospects.
In recent years, domestic more and more to pipe-roof method application, have also been made some and improve, occurred " new pipe-roofing method " (NewTubularRoofMethod is called for short NTR engineering method), also had person skilled to be called " pipe curtain builds method in advance ".Its main technology path is: adopt comparatively traditional pipe-jacking technology or shield technique by cluster large diameter steel pipe pushing tow or draw in stratum; construct at large diameter steel pipe endosome; join together into the underground structure outline of design anticipation; then under the protection of shaped structure, inside configuration stratum is excavated, and internal construction of constructing.
Because large diameter pipe curtain forms large rigidity temporary support structures; the earth's surface distortion caused when can reduce excavation; avoid having an impact to surrounding building, for shallow embedding big cross section weak soil, building is intensive, environmental protection requirement is high engineering, there is unrivaled advantage.
Horizontal jet grouting stake take high-pressure pump as power source, by horizontal drill drilling rod, nozzle, the slurries prepared are ejected in the soil body, the soil body in certain limit to be penetrated with huge energy and is worn by injection stream, and while nozzle makes slow circumvolve and advance and retreat cutting soil, force soil a position mix with slurry agitation.After grout cures, form horizontal circle column cement-soil induration and horizontal jet grouting stake, intensity and the architectural characteristic of the soil body can be significantly improved, after rotary churning pile is engaged mutually, just form closed horizontal jet grouting curtain body with concentric circles at tunnel vault and periphery, play anti-quicksand, resistant slide, impermeable, anti-collapse and prevent the effect of the ground settlement making because of tunnel excavation the excessive dehydration in stratum cause.
The effect of horizontal jet grouting stake: 1, for tunnel excavation provides arch to protect; 2, reduce the permeability of ground or carry out tunneling boring water shutoff; 3, the intensity of ground is improved; 4, stablize face, reduce tunnel deformation.
The horizontal jet grouting stake scope of application: 1, the soft stratum particularly weak broken ground of rich water, as: mud, sand, soil or wherein several combinations; 2, special formation: fault belt, landslide accumulation body etc.
The advantage of horizontal jet grouting stake: cost is low, efficiency is high, effective, reliably controlled.
1, controllability: the region in sphere of action all obtains reinforcing more uniformly;
2, arch is become: multiple horizontal jet grouting stake combination can form domes;
3, water shutoff: can comprehensive (360 degree) water shutoff;
4, high strength: destroy and by mixing or replacing original place layer, concretion body strength is high.
As shown in Figure 7, use the construction sequence of pipe curtain rotary churning pile supporting and protection structure build underground structure as follows:
1, upper pipe working well and received well is constructed;
2, steel pipe jacking, jacking order for axis, cross section for benchmark from lower to upper symmetry carry out;
Note: steel pipe laying method has: fixed (leading), to Drilling Method, horizontal spiral drilling method, rammer pipe construction method, pipe jacking method, miniature pipe jacking method/micro-tunneling construction method, the most frequently used is pipe jacking method.
3, horizontal jet grouting pile driving construction between steel pipe, the number of horizontal jet grouting stake is determined by the steel pipe spacing designed.
4, fill concrete in steel pipe as required.
5, in pipe curtain rotary churning pile supporting and protection structure, excavate portal 3, excavation limit, limit supports.
6, construct internal construction piecemeal, and progressively remove pipe curtain rotary churning pile supporting and protection structure inner support, the underground structure that final formation is complete.
Under the protection of pipe curtain rotary churning pile supporting and protection structure, the construction of underground structure can adopt excavation plan, also can adopt box culvert advancing scheme etc.
One, pipe curtain steel pipe pipe-jacking project constructure scheme, technological process
(1) pipe curtain steel pipe situation
Pipe curtain diameter of steel tube can get 0.3m-2m usually, also can select larger diameter according to concrete engineering situation.
(2) soil stabilization
Can first reinforce by designing requirement the hole place soil body before the jacking of pipe curtain steel pipe push pipe, soil stabilization can carry out when construction of working shaft.
(3) through wallsly to appear
Before appearing, first slice off pre-buried steel box outside plate, and water-stopping steel boxing is received the outside of pre-buried steel box, then watertight rubber circle is arranged on sealing steel loop.When preparing to appear, side block soil steel plate in steel box being sliced off, immediately tool heads is advanced embedded hole after the foreign material in cleaning preformed hole, shorten the dead time, making watertight rubber circle hug tool heads shell and play sealing effect.
Will prevent tool heads from dropping when push pipe is through walls, at the initial stage through walls, less because burying, the deadweight of tool heads is only by 2 supports, and be wherein guide rail, on the other hand bury the more shallow soil body.Therefore, when tool heads is through walls, on the one hand will with an initial angle (about 5 ') upwards, will there be rest wall pipe bottom on the other hand, and strengthens pipeline section and tool pipe, connection between pipeline section and pipeline section.In addition, the propelling of tool pipe must be rapid, do not make the soil body open-assembly time in wall pipe oversize.
(4) normal jacking
Pipeline is appeared successfully, starts normal jacking.While tube coupling advances, the push-bench large knife cutting front soil body is discharged.Successively pushed ahead by tube coupling one, push-bench constantly advances and finally arrives received well, forms whole section of passage.
(5) pipe curtain steel pipe landing edge
Joint, by welding annular and vertical stiffener reinforcing pipes end, increases its rigidity, and on the annular strength plate of its reinforcing, connecting bolt, that carries out in work progress is spacing and fixing.Socket arranges twice neoprene packing circle and carries out waterproof.Joint will have the adaptive capacity of certain corner.
(6) received well is entered
Push-bench, close to after arriving soil stabilization scope before received well, should slow down move speed, make push-bench slowly cut the soil body, form a more complete sealing hole.By measuring the particular location making push-bench outlet, the concrete guard wall of received well tool head position is cut.When push-bench enters received well limit, fast jacking wanted by push-bench, until push-bench ejects received well completely.
(7) pipe curtain mud displacement
After the jacking of pipe curtain terminates, for preventing pipe curtain from occurring delayed sedimentation, by the material of designing requirement, the thixotropic slurry in jack-in process is displaced.The system of pressure injection thixotropic slurry and pipeline is utilized to carry out during displacement.Pressure injection order: carry out backward successively from the first pipe joint.
(8) pipe curtain filling concrete and filling
After the jacking of pipe curtain completes, adopt slightly expanded concrete to fill, after having constructed with hammering and ultrasound examination concrete compaction rate and and steel pipe between whether closely connected.
(9) pipe curtain lubrication drag reduction
Adopt in swell soil thixotropic slurry flow in pipes and the annulus around between soil layer, realize reducing the frictional resistance between jacking pipeline and stratum.Slip casting is three parts, and the slip casting at slurry and hole place is mended in tail synchronous slip casting, pipeline along the line.The basis of thixotropic slurry is made up of swell soil and water, and in addition, the additive mixing different polymer according to the different soil bodys regulates mud property to meet instructions for use.
(10) pipe curtain steel pipe top pipe construction flow process
Pipe curtain steel pipe push pipe jacking construction flow process as shown in Figure 8.Preparation of construction-tube coupling propelling-track adjustment-tube coupling reception-push pipe filling concrete, wherein, tube coupling advances the processing of front advanced line pipe joint and goes into the well, track adjustment adopts tube coupling to lubricate slip casting outward, push pipe filling concrete is installed on to reinforce by concrete transportation and pump line and realizes, meanwhile, real time status is observed when push pipe filling concrete by gas outlet.
Two, pipe curtain steel pipe horizontal directional drill (hauling pipe) constructure scheme, technological process
(1) measurement and positioning
According to the datum mark provided, carry out the setting-out work of pipe curtain steel pipe by design drawing requirement, on the metope of active well and received well, accurately survey the position of the every root copper pipe of discharge piping curtain, adopt paint to indicate clear.Surveying and locating is allowed for access after need checking the construction of subsequent processing.
(2) boring location
According to survey mark, on the metope of active well and received well, adopt water drilling to be holed the position of every for pipe curtain root steel pipe, to locate the position of every root steel pipe, and finish serial number at active well and received well correspondence respectively.
(3) hole is drawn
Horizontal directional drilling machine is hung in lower active well, installation in position.Drilling rod draws hole from the perforate of the work borehole wall, and hole is introduced into received well by drill bit, and gets out in the hole of the corresponding numbering of received well.
(4) reaming
Laid down by drill bit, installed by reamer and be connected on drilling rod, drilling rod starts back to drag, and reamer is dragged to active well from the perforate mouth of received well, namely completes reaming.
(5) hauling pipe
Pipe curtain steel pipe is put into received well, and front end is connected with drilling rod, and the steel pipe of drilling rod and connection returns and drags by horizontal directional drilling machine, and steel pipe front end is dragged to active well.
Because in received well, bulk is limited, steel pipe needs connection segment in received well, and the interface of connection adopts welding.
Steel pipe is dragged to the process of active well from received well, and underground sediment can enter in steel pipe from the front end of steel pipe, needs to install a high-pressure water pipe (diameter in steel pipe
flexible pipe), with water under high pressure, silt underwashing is flowed in received well and processes.
Repeat (3)-(5) operation, complete the construction of all pipe curtain steel pipes.
Three, horizontal jet grouting pile driving construction scheme, technological process
Horizontal jet grouting pile constructing process flow process is as shown in Figure 9:
(1) preparation of construction
Whether careful inspection rig, high-pressure slip-casting pump operation be normal, and whether drilling tool, instrument be complete.Surveying setting-out fixed pile, makes two same mileage points at tunnel two-sided measurement unwrapping wire, tunnel axis, and marks tunnel excavation outline line in face measurement, measures and makes stake position, and finish each pile No., perform a bit flag with reinforcing bar.
(2) rig and high-pressure pump are installed
Finishing operations platform, lays track, installs column, and digs gutter.Billet specification: length × wide=250mm × 250mm, the expand tube diameter of bolt:
billet and basis are fixed and are wanted jail, and intensity wants high, the levelling error < 3mm of H profile steel rail, the diagonal side of looking for, chassis error ± 3mm, brace need be tightened, and the pulling force that intersects is substantially equal, four post Angle Error ± 5mm, the slips of jacking system etc. tighten, and strengthen globality; High-pressure pump fabricating yard is smooth, sclerosis, installs and wants steadily, and pipeline installation is put neat; After equipment installs, by adjustment rig angle, the orientation of confiding a technological secret, mating holes position, hole position error controls within ± 5mm.
(3) prepared slarry
According to constructure scheme and the proportioning preparation cement paste required of confiding a technological secret, require water: cement is 1:1, should measurement serous fluid proportion at any time in pulping process, slurries homogenizer mixing, the necessary continuous uniform of mixing slurries, mixing time is not less than 3 minutes, once stirs and also controls within 4h service time, and requires to carry out test block test to slurries.
(4) creep into
1. adopt
drill bit creeps into, and when creeping into the 1m degree of depth by a diameter is
in the orifice tube of long 1m is imbedded and holed, orifice tube exposes 0.5m, and orifice tube surrounding is sealed with coagulating cement wink.Implant at face
reinforcing bar 4, uses Anchor Agent consolidation, with orifice tube firm welding, and adjusts rig to position, hole, sends in hole, mounting sealing device by starter and first drilling rod.
2. rig pressure must not more than 2.0MPa.
3. often creeping into 3m wants deviational survey once, and carries out deviational survey record, and each deviational survey angular deviation is no more than 3%, will rectify a deviation, until drilling to completion once find that deflection is overproof.Starter is the key of correction.
(5) high-pressure mortar spraying
Creep into projected depth, adjustment nozzle location, closes water route, opens slurry channels, improve slurry pressure gradually, make its pressure reach more than 10MPa, makes the anterior nozzle 90-degree rotation of drill bit by slurry pressure, stretches out and upright in drill bit.Check whether pump pressure reading reaches designing requirement (35-40MPa), at the bottom of hole, stop certain hour during high-pressure mortar spraying, and then slowly extract drilling rod, should return when pulling out 0.6m outside every and drag 0.3m drilling rod, simultaneously high-pressure rotary-spray.Note observing pump pressure change, should notify when pump pressure is too low that board stops whitewashing in time, after ascertaining the reason, recover high-pressure rotary-spray again.
(6) sealing of hole
When whitewashing is to aperture face 0.5m, stop whitewashing, turn off high-pressure pump, draw nozzle with outside special pull bar, unload the sealing device of orifice tube outermost end, close circulation fluid outlet opening, extract drilling rod and drill bit fast, close large ball valve, inject from sealing of hole slurry inlet and coagulate cement grout (or cement grout of adulterate water glass, accelerating admixture) wink, prevent slurries from leaking.
(7) pipe blow-through and equipment
All apply clear-water high-pressure flushing pipe and equipment after every pile construction, guarantee not stay residue in pipeline, after cleaning, move to next position.
(8) construction precautions
1. pile body work progress is wanted continuously, can not be interrupted, prevent broken pile, stub phenomenon.Connect during slip casting, unload, replace tubes wants fast, prevent collapse hole and gag somebody.As shut down at 30-60 minute because of mechanical breakdown or other reason, should repeat to stir spray 1m, more than 1h, by broken pile treatment, again stake should be bored.Forbid to carry out rotary jetting apparatus when not reaching projected depth and not yet churning is full and retreat churning operation, the strict keyhole degree of depth, churning speed.
2. conscientiously carry out slurries gage work, record slurries add up straying quatity, forbid collaboration than inaccurate slurries.
3. as there is grout in whitewashing process, slurry-outlet quantity hour should carry out shutoff from aperture, in time if slurry-outlet quantity is larger, then should consider to add accelerating admixture in slurries, and control whitewashing amount and spouting velocity, note not making useless slurry assemble or flow through bottom excavation face, in order to avoid stratum bottom maceration.
4. the angle of stake will according to the Angle ambiguity of this section of line pipe curtain steel pipe, and Construction precision control is in ± 3 ‰ scopes.
By reference to the accompanying drawings detailed description of the invention of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (8)
1. a pipe curtain rotary churning pile supporting and protection structure, it is characterized in that, comprise some pipe curtain steel pipes, at least one horizontal jet grouting stake is provided with between every two pipe curtain steel pipes, and pipe curtain steel pipe contacts with the edges close of horizontal jet grouting stake, pipe curtain steel pipe is combined to form common supporting stress system together with horizontal jet grouting stake.
2. a pipe curtain rotary churning pile supporting and protection structure, it is characterized in that, comprise some pipe curtain steel pipes, at least one horizontal jet grouting stake is provided with between every two pipe curtain steel pipes, and pipe curtain steel pipe contacts with the edges close of horizontal jet grouting stake, be filled with concrete in part pipe curtain steel pipe, pipe curtain steel pipe is combined to form common supporting stress system together with horizontal jet grouting stake.
3. pipe curtain rotary churning pile supporting and protection structure as claimed in claim 2, is characterized in that, the pipe curtain steel pipe interval being filled with concrete pipe curtain steel pipe and non-fill concrete is arranged.
4. a pipe curtain rotary churning pile supporting and protection structure, comprise some pipe curtain steel pipes, at least one horizontal jet grouting stake is provided with between every two pipe curtain steel pipes, and pipe curtain steel pipe contacts with the edges close of horizontal jet grouting stake, all be filled with concrete in described pipe curtain steel pipe, pipe curtain steel pipe is combined to form common supporting stress system together with horizontal jet grouting stake.
5. the pipe curtain rotary churning pile supporting and protection structure as described in claim 1 or 2 or 4, is characterized in that, is provided with the horizontal jet grouting stake of two next-door neighbours between every two pipe curtain steel pipes, the edges close contact of the horizontal jet grouting stake of every two next-door neighbours.
6. the pipe curtain rotary churning pile supporting and protection structure as described in claim 1 or 2 or 4, is characterized in that, is provided with the horizontal jet grouting stake more than two next-door neighbours between every two pipe curtain steel pipes, and the edges close contact of the horizontal jet grouting stake of every two next-door neighbours.
7. the pipe curtain rotary churning pile supporting and protection structure as described in claim 1 or 2 or 4, is characterized in that, described pipe curtain diameter of steel tube is 0.3m-2m.
8. the pipe curtain rotary churning pile supporting and protection structure as described in claim 1 or 2 or 4, is characterized in that, the arrangements of described pipe curtain rotary churning pile supporting and protection structure is circular, rectangle or other arbitrary shapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521048737.7U CN205172598U (en) | 2015-12-16 | 2015-12-16 | Pipe curtain spouts a supporting construction soon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521048737.7U CN205172598U (en) | 2015-12-16 | 2015-12-16 | Pipe curtain spouts a supporting construction soon |
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| Publication Number | Publication Date |
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| CN205172598U true CN205172598U (en) | 2016-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521048737.7U Expired - Fee Related CN205172598U (en) | 2015-12-16 | 2015-12-16 | Pipe curtain spouts a supporting construction soon |
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| CN (1) | CN205172598U (en) |
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| CN107013225A (en) * | 2017-04-13 | 2017-08-04 | 叶晓明 | The anti-collapse tunneling shield method of churning water shutoff |
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| CN107916935A (en) * | 2017-11-13 | 2018-04-17 | 浙江大学城市学院 | A kind of soil body composite reinforcing structure and construction method of the existing subway of weak soil shield crossing |
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