The construction method of the built-in anti-float anchor rod plugging structure of sole plate precipitation of deep well
Technical field
The present invention relates to a kind of built-in anti-float anchor rod plugging structure of sole plate precipitation of deep well and construction method.Belong to
Field of foundation treatment, it is adaptable to which structure foundation plugging dewatering well processes engineering.
Background technology
As city ground development space is limited, underground space utilization rate is raised and deepened continuously year by year, therefore is largely built
Meeting deep pit excavation when building construction, and be frequently encountered in deep foundation pit construction and dewatering well is set in basement permanent structure base plate
Situation.In most cases, required to meet job site, dewatering well needs just be blocked after the completion of construction of bottom plates,
Therefore dewatering well just turns into inevitable through bed course, and at the same time sole plate waterproof requirement is again high, and the closure at dewatering well position must
So turn into a major issue in construction.
Current conventional construction method is to backfill crushed stone concrete etc. to base mat at once after underground water in dewatering well is drained
Layer absolute altitude, while being poured to basic top surface, construction method using the expansive concrete of higher than base concrete one light strength grade
Being disadvantageous in that can produce construction joint in precipitation well head part position, bring leakage hidden trouble, and cannot repair;Or will be dropped using steel pipe
Well spreading, through sole plate, steel pipe outside welding sealing wing plate, it is to be onstructed finish after welded using steel plate on the inside of steel pipe
Closure, construction method is disadvantageous in that closure weld interval is more long, and the plugging dewatering well difficulty big for water yield is big.
Further, in order to improve the construction quality that plugging dewatering well is constructed, various new plugging dewatering well technology is had,
Such as a kind of plugging system of dewatering well(ZL:201120242057.4), it uses steel pipe by dewatering well spreading, through basic bottom
Plate, is welded with screw thread supporting, directly using screw thread closure plate envelope during closure while the welding sealing edge of a wing of steel pipe outside in steel pipe
Stifled, though have blocking speed faster, steel pipe is not enough with the bonding strength of dewatering well, is easily produced when building occurs differential settlement
Raw crack, and steel screw thread is perishable, durability is poor;A kind of and for example deep foundation pit precipitation well plugging structure(ZL:
201320158546.0), it stretches into dewatering well steel pipe, is fixed using fixture and ring flange sealing, while setting waterproof
Layer and waterproof roll, though between sole plate have sealing higher, level of ground water it is higher, buoyancy is excessive when meeting
The hidden danger of quality such as cause overall plugging structure to lift.Additionally, in the plugging construction of dewatering well, that commonly uses that some aid in is used for
The plugging device of plugging construction, but there is the defect such as complex structure, relatively costly, narrow application range.
In sum, though existing plugging dewatering well structure can obtain ideal plugging effect, in plugging structure
The aspects such as durability, efficiency of construction, anti-floating performance and economic benefit are remained can improve part.
In consideration of it, needing a kind of closure reliable in quality of invention, the deep-well that later stage anti-floating ability is high, economic benefit is excellent badly at present
Plugging dewatering well structure.Plugging structure can be substantially improved using the built-in anti-float anchor rod plugging structure of dewatering well of deep well in sole plate
Construction quality and later stage building foundation anti-floating performance, and with certain economic technology benefit.
The content of the invention
It is an object of the invention to provide a kind of efficiency of construction is high, closure quality is good, anti-floating performance is strong dewatering well of deep well
Built-in anti-float anchor rod plugging structure and construction.
To realize above-mentioned technical purpose, present invention employs following technical scheme:
A kind of built-in anti-float anchor rod plugging structure of sole plate precipitation of deep well, it is characterised in that precipitation well head sets steel
Sleeve pipe, precipitation bottom is formed to expand in body soil cement end, well to set to be set in bellows anti-float anchor rod, anchor pole pouch by reaming and expanded
Exhibition end plate, bellows anti-float anchor rod is provided with circular orientation reinforcing bar, and the insertion of anchor pole pouch passes through high-pressure slip-casting shape after expanding body soil cement
Expand body anti-floating end into mud jacking, anchor pole upper end anchors through after blocking steel plate;Closure steel plate top surface is welded to connect reinforcing bar, and bottom surface is set
Waterproof rubber gasket, closure steel plate is bolted with steel sleeve junction steel plate, and closure steel plate top surface is followed successively by anti-water coagulation
Soil layer and rear pouring concrete obturator.
Described steel sleeve is suitable for reading to set annular junction steel plate, prepared screw-bolt hole on junction steel plate;Steel bushing pipe outer wall is provided with
Two-layer annular waterproof steel plate, waterproof steel plate is embedded in blinding layer and sole plate respectively.
Described closure steel plate is the diameter round plate equal with steel sleeve junction steel plate external diameter, and top surface is uniformly and vertical welding
Connect reinforcing bar in succession, bolthole is reserved at center, edge prepared screw-bolt hole, the bolt hole phase on spiro keyhole position and steel sleeve junction steel plate
Correspondence.
Described bellows anti-float anchor rod is hollow steel tube, shaft spaced set circular orientation reinforcing bar, spacer bar diameter
Equal with dewatering well internal diameter, the body of rod is uniformly provided with injected hole in pouch.
Described extension end plate is made up of two blocks of symmetrically arranged radial type steel plates, and every block of radial type steel plate can be symmetrical above and below
Fold, steel plate two ends are hingedly connected with connection ring and lower connection ring, and upper connection ring is welded and fixed with the body of rod, lower connection ring is can
Movable and set steel wire rope, steel wire rope is built in the body of rod of bellows anti-float anchor rod.
Described anchor pole pouch is made of waterproof high-abrasive material, and anchor pole pouch two ends are connected using steel loop with anchor pole,
Steel loop is fixed by limiting plate, and limiting plate is welded to connect with anchor pole.
Present invention also offers the construction method of the built-in anti-float anchor rod plugging structure of the dewatering well of deep well, it is mainly constructed
Step is as follows:
1)Prepare before construction:According to design drawing, job site is processed, draw construction contour line, make steel sleeve and phase
Steel member is closed, construction material, machinery, personnel are in place;
2)Interim fixed sleeving position:Steel sleeve, contraposition placed in the middle are buried in precipitation well head, and uses reinforcing bar as support
Frame, interim stationary steel bushing pipe;
3)Pour blinding concrete:According to construction requirement casting concrete blinding layer, blinding layer thickness should cover completely
Lid steel bushing pipe outer wall lower floor annular waterproof steel plate, after blinding layer has been poured, carries out wooden model support and suitable for reading to steel sleeve covers in time
Lid protection;
4)Pour outside of sleeve underplate concrete:By design requirement casting concrete sole plate, under sole plate mouth with
Steel sleeve junction steel plate is equal or slightly lower;
5)Take out water pump, the reaming of dewatering well bottom:Water pump is taken out after the completion of underplate concrete maintenance, using mechanical hole reaming equipment
Churning reaming, forms mud jacking and expands body anti-floating end;
6)Lay bellows anti-float anchor rod:Bellows anti-float anchor rod is slowly imported in dewatering well, until anchor pole end reaches design
Absolute altitude, anchor pole pouch body is fully-inserted to be expanded in body soil cement, and anchor pole top is fixed temporarily using reinforced frame;
7)The slip casting of anchor pole pouch, opening extension end plate:According to design pressure and grouting amount, cement mortar of pouring water is pressed, make anchor pole
Pouch is expanded into design form and size, and after mud jacking expansion body anti-floating end reaches some strength, lifting steel wire rope opens extension end
Plate;
8)Dewatering well backfills pea gravel concreten:Dewatering well is filled up using mortar and pea gravel concreten after the completion of slip casting;
9)Closure steel plate is installed:Anti-float anchor rod temporary fastening device is removed, steel plate will be blocked using bolt and nut respectively
Anchored with steel sleeve junction steel plate, anti-float anchor rod and closure steel plate;
10)Pour cover plate top concrete:After above-mentioned plugging construction is fully completed, one layer is first poured on closure steel plate
Water-proof concrete, water-proof concrete layer is completely covered vertical connection reinforcing bar, then pours expansive concrete, and filling is closely knit, after initial set
Water storing conservation.
The characteristics of present invention has following and beneficial effect:
(1)The steel bushing pipe outer wall of precipitation well head sets two-layer ring seal steel plate, and blinding layer and basic bottom are embedded in successively
In plate, the infiltration path of underground water is effectively extended while increasing steel sleeve stability, improve the waterproof effect of plugging structure.
(2)The closure steel plate with waterproof rubber gasket is installed at the steel sleeve top of precipitation well head, is set on closure steel plate
Connection reinforcing bar, and water-proof concrete and concrete enclosing body are poured successively, the infiltration path of underground water is cut off, while operating letter
Just, construction cost is low, good water-proof effect.
(3)Precipitation bottom carries out reaming by equipment, and sets bellows anti-float anchor rod, and being used as Grouting Pipe by anchor pole enters
Horizontal high voltage slip casting forms mud jacking and expands body anti-floating end, and is provided with extension end plate on anchor pole in pouch, can effectively improve basis and exist
Anti-floating performance after plugging dewatering well, it is ensured that the quality of plugging structure after work.
Brief description of the drawings
Fig. 1 is the built-in anti-float anchor rod plugging structure schematic diagram of sole plate precipitation of deep well of the present invention;
Fig. 2 is steel sleeve and closure steel plate connection diagram in the present invention;
Fig. 3 is pouch, extension end plate and body of rod connection diagram in bellows anti-float anchor rod in the present invention.
In figure:1- sole plates, 2- blinding layers, pouring concrete obturator after 3-, 4- bolts, 5- water-proof concretes layer,
6- connects reinforcing bar, 7- closure steel plates, 8- waterproof rubber gaskets, 9- waterproof steel plates, 10- steel sleeves, 11- original dewatering wells, 12- anti-floatings
Anchor pole, 13- circular orientation reinforcing bars, 14- extension end plates, 15- grouting behind shaft or drift lining soil cement carries anti-floating body, and 16- mud jacking expands body anti-floating end,
17- anchor pole pouches, 18- expands body soil cement, and 19- nuts, 20- waterproof gaskets, 21- steel loops, 22- spacing steel plates are connected on 23-
Ring, connection ring under 24-, 25- steel wire ropes.
Specific embodiment
The construction technical requirement of sole plate and bed course in present embodiment, welding procedure technical requirements, pouch pressure injection high
Slurry proportioning etc. is repeated no more, and emphasis illustrates the reality of the built-in anti-float anchor rod plugging structure construction of the dewatering well of deep well being related to of the invention
Apply mode.
Fig. 1 is the built-in anti-float anchor rod plugging structure schematic diagram of sole plate precipitation of deep well of the present invention, and Fig. 2 is the present invention
Middle steel sleeve and closure steel plate connection diagram, Fig. 3 are pouch and body of rod connection diagram in bellows anti-float anchor rod in the present invention.
The built-in anti-float anchor rod plugging structure of dewatering well of deep well shown in reference picture 1, mainly by steel sleeve 10, closure steel plate 7, anti-float anchor rod
12nd, the composition such as pouch 17, embodiment is illustrated by taking the former dewatering well 11 of D=500mm as an example:
Steel sleeve 10 uses the seamless steel pipe or spiral welded steel pipe of diameter 500mm, 600mm long, thick 5mm, connection suitable for reading
Steel plate width is 60mm, and two pieces of thickness are welded in the outer wall level away from top junction steel plate 60mm of steel sleeve 10 or so, 240mm or so
The bolt hole of a diameter of 8mm is reserved at edge 20mm in the annular waterproof steel plate 9 of 4mm, 100mm wide, junction steel plate surface.In original
The contraposition placed in the middle suitable for reading of dewatering well 11, buries steel sleeve 10 vertically, and length of embedment is 250mm or so, and using reinforcing bar as support
Frame, fixes steel sleeve 10 temporarily.
The blinding layer 2 of C15 concretings thickness 100mm, base are used after steel sleeve 10 is temporarily fixed according to construction requirement
Plinth bed course 2 is used above the sole plate 1 of C30 concretings thickness 350mm ~ 400mm, pours before base plate 1 in steel sleeve 10 weeks
Enclose and hang the square hole that Mo Liu sets 800mm × 800mm × 300mm, the absolute altitude at the top of steel sleeve 10 is not less than away from the absolute altitude of sole plate 1
100mm is convenient to ensure the bolt construction for blocking steel plate 7.
Water pump is taken out after the completion of the concrete curing of sole plate 1, using mechanical hole reaming equipment churning reaming, diameter is formed
1200mm or so expands body soil cement 18, and the bellows anti-float anchor rod 12 of internal diameter 25mm, wall thickness 6mm is slowly then imported into dewatering well
In, until the lower end of anti-float anchor rod 12 reaches designed elevation, pouch 17 is fully-inserted to expand in body soil cement 18, and by anti-float anchor rod 12
Top is fixed temporarily using reinforced frame.Wherein pouch 17 is made using polyester long fiber composites, by steel loop 21 and anti-floating
Anchor pole 12 is connected, and steel loop 21 is fixed by the spacing steel plate 22 for being welded on anchor surface.
According to design pressure and grouting amount, cement mortar of pouring water is pressed, the mud jacking for making pouch 17 be expanded into diameter 800mm or so expands
Body anti-floating end 16, after the cement mortar in pouch 17 reaches some strength, lifting steel wire rope 25 opens extension end plate 14, wherein
The monolithic radial type steel plate for extending end plate 14 is formed by two block specifications for the small steel plate of 600mm × 400mm is hinged.
Former dewatering well 11 is backfilled using cement mortar after the completion of slip casting, grouting behind shaft or drift lining soil cement is formed and is carried anti-floating body 15, returned
When being filled to 300mm below the absolute altitude of blinding layer 2, C30 concretings are changed, poured left to the following 50mm in the top of steel sleeve 10
The right side, after the completion of remove the temporary fastening device of anti-float anchor rod 12, steel plate and steel will be blocked using bolt 4 and waterproof rubber gasket 8
Sleeve pipe connection steel plate is anchored, and anti-float anchor rod 12 is anchored with closure steel plate 7 using nut 19, and nut 19 installs collision mat before anchoring
Piece 20.Wherein the bolthole of diameter 25mm, the reserved diameter 8mm corresponding with steel sleeve 10 of surrounding are reserved in closure steel plate 7 center
Bolt hole, top surface is uniform and threaded connection reinforcing bar 6 of vertical welding spreading 80mm.
After above-mentioned plugging construction is fully completed, the water-proof concrete layer of a thickness 100mm is first poured on closure steel plate
5, then carry out secondary pouring to form rear pouring concrete obturator 3 using expansive concrete, last top covers wet gunnysack or straw bag,
Carry out the wet curing no less than 14 days.
The construction key step of the built-in anti-float anchor rod plugging structure of dewatering well of deep well is as follows:
1)Prepare before construction:According to design drawing, process job site, draw construction contour line, make steel sleeve 10 and
Related steel member, construction material, machinery, personnel are in place;
2)Interim stationary steel bushing pipe position:Steel sleeve 10, contraposition placed in the middle are buried in precipitation well head, and uses reinforcing bar as branch
Support, interim stationary steel bushing pipe 10;
3)Pour blinding concrete:According to construction requirement casting concrete blinding layer 2, the thickness of blinding layer 2 should be complete
Covering steel sleeve 10 outer wall lower floor annular waterproof steel plate 9, after blinding layer 2 has been poured, carries out wooden model support and to steel sleeve in time
10 covering protections suitable for reading;
4)Pour outside of sleeve underplate concrete:By design requirement casting concrete sole plate 1,1 time mouth of sole plate
It is equal or more slightly lower with the junction steel plate of steel sleeve 10, it is allowed to deviation ± 10mm;
5)Take out water pump, the reaming of dewatering well bottom:Water pump is taken out after the completion of the concrete curing of sole plate 1, is expanded using machinery
Hole equipment churning reaming, forms mud jacking and expands body anti-floating end 16;
6)Lay bellows anti-float anchor rod:Bellows anti-float anchor rod 12 is slowly imported in former dewatering well 11, until anti-float anchor rod
12 ends reach designed elevation, and anchor pole pouch 17 is fully-inserted to expand in body soil cement 18, and the top of anti-float anchor rod 12 is faced using reinforced frame
When fix;
7)The slip casting of anchor pole pouch, opening extension end plate:According to design pressure and grouting amount, cement mortar of pouring water is pressed, make anchor pole
Pouch 17 is expanded into design form and size, and after the end of mud jacking expansion body anti-floating 16 reaches some strength, lifting steel wire rope 25 is opened
Extension end plate 14;
8)Dewatering well backfills pea gravel concreten:Former dewatering well is filled up using cement mortar and pea gravel concreten after the completion of slip casting
11;
9)Closure steel plate is installed:The temporary fastening device of anti-float anchor rod 12 is removed, respectively will closure using bolt 4 and nut 19
Steel plate 7 is anchored with the junction steel plate of steel sleeve 10, anti-float anchor rod 12 and closure steel plate 7;
10)Pour cover plate top concrete:After above-mentioned plugging construction is fully completed, one is first poured on closure steel plate 7
Layer water-proof concrete, water-proof concrete layer 5 is completely covered vertical connection reinforcing bar 6, then pours expansive concrete, and filling is closely knit, just
Water storing conservation after solidifying.