CN104074197B - The construction method of large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure - Google Patents

The construction method of large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure Download PDF

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CN104074197B
CN104074197B CN201410102546.8A CN201410102546A CN104074197B CN 104074197 B CN104074197 B CN 104074197B CN 201410102546 A CN201410102546 A CN 201410102546A CN 104074197 B CN104074197 B CN 104074197B
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construction
anchor
cylinder
pile
stake
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CN104074197A (en
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王军
叶强
蔡袁强
丁光亚
王鹏
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China Metallurgical Group northwest Geotechnical Engineering Co., Ltd.
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Wenzhou University
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Abstract

The invention discloses a kind of construction method of large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure, this Design of Retaining Structure relates generally to water-stop curtain, thin-walled cylinder pile, passive area reinforcing pile, capping beam and the connection and structure design of enclosing purlin, this building enclosure work progress mainly contains water-stop curtain construction, the construction of large diameter thin wall cylinder stake, passive area reinforcing pile construction, the construction of ground floor anchor pole (under dig foundation ditch → rig pore-forming → anchor bar body hand-hole → anchoring section grouting → free end be in the milk → install clamp nut), second layer anchor bolt construction (under dig foundation ditch → rig pore-forming → anchor bar body hand-hole → anchoring section grouting → free end grouting) and ground floor enclose purlin construct (colligation is enclosed purlin reinforcing bar → installation and enclosed purlin template → casting concrete). by special structure design and construction by tradition be mainly used in ground processing the stake of large diameter thin wall cylinder and high strength anchor bar, enclose the compound foundation ditch of going along with sb. to guard him of purlin, reach economy, environmental protection and effect efficiently, and for follow-up foundation pit construction bring convenient greatly.

Description

The construction method of large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure
Technical field
The present invention relates to a kind of building enclosure of building foundation pit, what further relate to is a kind of soft clay region foundation ditchNovel resulting structure design and the corresponding construction method gone along with sb. to guard him.
Background technology
China development be mainly expanding economy, what expanding economy brought is the development of building industry, building industry send outExhibition direction certainly will be that the more Gao Geng great of building is more excellent more beautiful, and the guarantee of this direction is to lay a solid foundation for building, thisAlso just require to do manyly aspect foundation pit enclosure. On the other hand, because building site is fewer and feweri, increasing building is executedWork has to carry out in the slightly poor soft clay area of basic condition, and this also just has more specifically proposed to go along with sb. to guard him how better weak soil groundThe such technical problem of district's foundation ditch.
Mainly contain at the foundation pit enclosure structure of soft clay area at present: soil nail wall, diaphram wall, SMW engineering method and perfusionStake adds inner support etc. Soil nail wall is by arranging the soil nailing of certain length and density in the soil body, with native acting in conjunction, formed withThe compound soil body that to strengthen stability of slope ability be main purpose, is a kind of initiatively restriction mechanism, soil nailing and native interaction, shapeBecome to improve the compound soil body of undisturbed soil strength and stiffness, changed distortion and the failure mode of slight slope, significantly improved soilThe resistance to overturning on slope. But soil nail wall exists and lacks the shortcoming of reasonably controlling the displacement theory of computation, for there being strict displacementThe soft soil foundation pit requiring is also inadaptable. Diaphram wall is to adopt on the ground a kind of trench machine, along deep excavation projectPeriphery axis, under mud off condition, excavates out a long and narrow deep trouth, after clear groove, hangs reinforcing bar, then with leading in groovePipe method underwater concreting with tremie method builds up a unit groove section, carries out so piecemeal, builds up continuous reinforced concrete one undergroundCob wall wall, as intercepting water, the foundation pit enclosure structure of antiseepage, load-bearing, dash. Diaphram wall building enclosure exists work progressThe waste mud difficult treatment of middle generation, the later cell wall of grooving easily caves in, and cost is higher, to unit in charge of construction's operant level requirementAlso higher problem. SMW engineering method building enclosure (stiffness cement soil continuous wall) is to adopt special multiple-rotor mixer, creeps into and cuts on the spotCut the soil body, simultaneously from its chisel edge, cement grout injected to the soil body, after repeatedly stirring and fully mixing, then by H shaped steel orOther core inserts in stirring body, forms diaphram wall body, and its main shortcoming is that to go along with sb. to guard him rigidity less, the distortion after excavationLarger. Bored concrete pile adds inner support and refers to that use cast-in-situ bored pile is as fender post, and fender post top arranges capping beam, establishes in foundation ditch outsidePut water-stop curtain and drainage measure is set in foundation ditch inner side, then one or more layers is set in foundation ditch inner side and encloses purlin and correspondingThe building enclosure of enclosing purlin place and arrange inner support. This building enclosure exists mud contamination serious, and mud subsequent treatment difficulty is boredHole power consumption is larger, the shortcomings such as inconvenience of constructing in fender post difficult quality guarantee and foundation ditch. On March 18th, 2014.
Summary of the invention
The technical problem that the present invention mainly solves is, for the foundation ditch of soft clay area provides a kind of safety, environmental protection, efficient, warpHelp and can provide design and the construction method thereof of large diameter thin wall cylinder stake building enclosure easily for follow-up excavation.
Technical solution of the present invention is: large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure, is characterized in that:Comprise cement mixing pile water stopping curtain, the stake of large diameter thin wall cylinder, ground floor anchor pole and second layer anchor pole, capping beam, enclose purlin and quiltMoving district reinforcing pile, the periphery of described water-stop curtain in foundation pit enclosure structure, and by the multiple single water around distributing along foundation ditchMud mixing pile forms; The stake of described large diameter thin wall cylinder is cast-type thin-walled cylinder pile, and in water-stop curtain inner side, large diameter thin wallCylinder stake comprises thin-walled pile body and pile crown, and pile crown is with pile crown through hole, and described stake top casting has been built and strengthened each fender post resistance to overturningCapping beam, on described thin-walled pile body, offer successively the first duct and the second duct along depth direction, described the first duct andThe second duct includes pile body hole in pile body and the soil body hole in the soil body, and described ground floor anchor pole inserts the first ductAnd arrive in soil body hole, between the first duct and ground floor anchor pole, be perfused with cement mortar, first of described ground floor anchor pole insertionOpening of the channel is built anchoring supporting plate, and clamp nut is connected with the threaded one end of ground floor anchor pole and supporting plate is pressed on to thin-walled pile bodyUpper, described second layer anchor pole inserts the second duct and arrives in soil body hole, between the second duct and second layer anchor pole, is perfused with waterMud, the body of rod reinforcing bar of the reserved certain length of described second layer anchor pole, outside the second duct, encloses the inner reinforcing bar of purlin and body of rod reinforcing barColligation, encloses purlin and is made up of concrete; Described passive area reinforcing pile is in large diameter thin wall cylinder stake inner side, and by being piled in the soil bodyCement mixing pile form.
The construction method of above-mentioned large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure comprises following construction procedure:
(1) water-stop curtain construction
The periphery of water-stop curtain in foundation pit enclosure structure, adopts a fairly large number of single cement distributing along foundation ditch aroundMixing pile surrounds and forms;
(2) large diameter thin wall cylinder pile driving construction
1. the prefabricated pile crown of large diameter thin wall cylinder stake is embedded between interior steel cylinder template and outer steel cylinder template;
2. at the just tube template top mounting clamp device that shakes, be used for fixing dither, dither adjust in place after, willInterior steel cylinder template and outer steel cylinder template and prefabricated pile crown are pressed into the interior extremely prefabricated pile crown of soil and reach projected depth;
3. the folder that the unclamps template top device that shakes, puts into annular template chamber by prefabricated steel reinforcement cage, by outer steel cylinder mouldConcrete pouring gate cast concrete on plate, and while hoisting steel tube template;
4. repeat above-mentioned steps, the next large diameter thin wall cylinder stake of constructing is until required all the going along with sb. to guard him of foundation ditch used major diameterThin-walled cylinder pile construction is complete;
5. reach after design strength until fender post concrete, remove the assorted soil at foundation pit enclosure stake top, build enhancing and respectively encloseThe capping beam of fender pile resistance to overturning.
(3) passive area reinforcing pile construction
Passive area reinforcing pile is in large diameter thin wall cylinder stake inner side, and is made up of the cement mixing pile being piled in the soil body.
(4) ground floor anchor bolt construction
1. dig down foundation ditch to the following 1m of ground floor Soil Anchor Design absolute altitude place;
2. adopt total powerstation to measure setting-out according to design drawing and determine position, Soil Anchor Design hole and anchor hole azimuth, andMark with it fender post;
3. rig is in place, holes in index aperture position;
4. anchor pole is firmly as one man pushed and enters duct, in propelling movement process, must not rotate the body of rod; Adopt pressure piston formulaGrouting pump is in the milk to duct, cement mortar, in Grouting Pipe pushes hole, is then in the milk, and builds at bolthole road junctionAnchoring supporting plate is also installed clamp nut.
(5) second layer anchor bolt construction
1. dig down foundation ditch to the following 1m of second layer Soil Anchor Design absolute altitude place;
2. adopt total powerstation to measure setting-out according to design drawing and determine position, Soil Anchor Design hole and anchor hole azimuth, andMark with it fender post;
3. rig is in place, holes in index aperture position;
4. anchor pole is firmly as one man pushed and enters duct, in propelling movement process, must not rotate the body of rod; Adopt pressure piston formulaGrouting pump is in the milk to duct, and cement mortar, in Grouting Pipe pushes hole, is then in the milk; The anchor pole of reserved certain lengthBody of rod reinforcing bar outside duct;
(6) ground floor encloses purlin construction
1. body of rod reinforcing bar and ground floor outside the second reserved duct of second layer anchor pole are enclosed to purlin reinforcing bar binding;
2. the template that ground floor encloses purlin is installed, and casting concrete;
3. the precast reinforced cage in step by step of construction procedure (2) has been reserved the required hole in anchor pole duct, is anchor pole energyTo cylinder, stake destroys minimum in the situation that compound with it through cylinder stake; Pouring concrete in construction procedure (2)-is 3. segmentationCast segmentation jolt ramming, steel form segmentation lifting.
Large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure of the present invention and construction method compared with prior art,There is following remarkable advantage and beneficial effect:
From macroscopic perspective, foundation pit enclosure structure of the present invention and work progress have mainly been given prominence to safety, environmental protection, economyAnd the advantage of several aspects such as convenient. First, the present invention is by making the anchor pole can be for the reserved anchor pole hole of cylinder pile cagesTo cylinder, stake destroys in minimum situation through cylinder stake, and further utilize reserved anchor rod body reinforcing bar to realize as bridge can beDo not destroy in the situation of cylinder stake thin-walled connecting cylinder stake, anchor pole and enclose purlin, forming the very good and anti-lateral deformation energy of resistance to overturningThe building enclosure that power is strong, has good security, in this building enclosure, inner support is not set simultaneously, can save a large amount of moneyThe waste in source (the general follow-up dismounting waste of inner support) and for the follow-up construction in foundation ditch brings great convenience, embodied thisEnvironmental protection, economy and the convenience of invention. Secondly, utilize the stake of large diameter thin wall cylinder to utilize as not needing in fender post work progressThe big machinery such as drilling machine and piling machine, does not need a large amount of mud offs, does not need to excavate a large amount of Site Soils, thereby can subtractNoise pollution in few work progress, reduces potential safety hazard, avoids subsequent transportation and the processing problem of mud and the earthwork, has embodiedSafety and Environmental Protection of the present invention; Finally, although this fender post diameter (has good resistance to overturning and anti-lateral deformation greatlyProperty), but required concrete and amount of reinforcement are but far smaller than other kind fender post of close diameter, have embodied the present inventionEconomy.
Brief description of the drawings
Fig. 1 is fender post, the anchor pole of foundation pit enclosure structure involved in the present invention and encloses purlin composite construction partial elevation view.
Fig. 2 is the side section partial structurtes schematic diagram of foundation pit enclosure structure involved in the present invention.
Fig. 3 is large diameter thin wall cylinder pilework and the construction schematic diagram of foundation pit enclosure structure involved in the present invention.
Fig. 4 is ground floor anchor pole and the signal of the thin portion of fender post composite construction of foundation pit enclosure structure involved in the present inventionFigure.
Fig. 5 is the structural representation of the second layer anchor pole of foundation pit enclosure structure involved in the present invention.
Fig. 6 is that the ground floor in Fig. 5 encloses purlin and the thin portion of fender post composite construction schematic diagram.
Fig. 7 be foundation pit enclosure structure involved in the present invention overlook partial structurtes schematic diagram.
Fig. 8 is that the ground floor of foundation pit enclosure structure involved in the present invention encloses purlin place and overlooks partial structurtes schematic diagram.
Shown in figure: 1, large diameter thin wall cylinder stake, 2, pile crown, 3, capping beam, 4, ground floor anchor pole, 5, second layer anchor pole,6, ground floor encloses purlin, and 7, outer steel cylinder template, 8, interior steel cylinder template, 9, dither, 10, the folder device that shakes, 11, concretingMouthful, 12, pile crown through hole, 13, foundation ditch, 14, anchoring section, 15, free segment, 16, anchor pole duct, 17, supporting plate, 18, clamp nut,19, Grouting Pipe, 20, cylinder pile cages, 21, hole, 22, body of rod reinforcing bar, 23, ground floor encloses purlin reinforcing bar, 24, high tensile steel wire, 25,Passive area reinforcing pile, 26, water-stop curtain.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 ~ Fig. 8 is a kind of embodiment of the present invention, and the foundation pit enclosure structure of illustrated embodiment is large diameter thin wall cylinderThe compound one deck of stake encloses purlin and two-layer anchor pole.
Its concrete structure design is as follows:
Shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, the large diameter thin wall cylinder stake that this embodiment providesCompound anchor rod-type foundation pit enclosure structure, comprise cement mixing pile water stopping curtain 26, large diameter thin wall cylinder stake 1, ground floor anchor pole 4,Second layer anchor pole 5, capping beam 3, ground floor enclose purlin 6 and passive area reinforcing pile 25. Described water-stop curtain 26 is tied in foundation pit enclosureThe periphery of structure, and formed by the multiple single cement mixing pile around distributing along foundation ditch, the diameter of cement mixing pile is 500mm,Pile spacing is 350mm, and projected depth is 8m, and cement is the portland cement of 32.5 grades, and the ratio of mud is controlled at 0.5 left and right. DescribedLarge diameter thin wall cylinder stake 1 is cast-type thin-walled cylinder pile, and in water-stop curtain 26 inner sides, large diameter thin wall cylinder stake 1 comprises thin-walledPile body and pile crown 2, pile crown 2 is with pile crown through hole, and the wall thickness of large diameter thin wall cylinder stake 1 is 200mm, and cylinder stake external diameter is 1000mm,Pile spacing is 1000mm, and projected depth is 10m, and the capping beam 3 that strengthens each fender post resistance to overturning is built in described stake top casting, large3 li of 1 top wedge pressure back timbers of diameter thin-walled cylinder pile, concrete grade is C30. On described thin-walled pile body along depth direction successivelyOffer two anchor pole ducts 16, anchor pole duct 16 is respectively the first duct and the second duct, described the first duct and the second holeRoad includes pile body hole in pile body and the soil body hole in the soil body, and described ground floor anchor pole 4 inserts the first duct and arrivesReach in soil body hole, between the first duct and ground floor anchor pole 4, be perfused with cement mortar, the first hole that described ground floor anchor pole 4 insertsAnchoring is built at road junction supporting plate 17, and clamp nut 18 is connected with the threaded one end of ground floor anchor pole 4 and supporting plate 17 is pressed on thinOn wall pile body, described second layer anchor pole 5 inserts the second duct and arrives in soil body hole, between the second duct and second layer anchor pole 5Be perfused with cement mortar, the body of rod reinforcing bar 22 of described second layer anchor pole 5 reserved certain lengths outside the second duct, ground floor anchor pole 4With second layer anchor pole 5 be fining twisted steel, the drilling depth in anchor pole duct 16 is 5m, aperture 80mm. The described inner reinforcing bar of purlin 6 that encloses23 with 22 colligations of body of rod reinforcing bar, enclose purlin 6 and formed by concrete. Described passive area reinforcing pile 25 is in large diameter thin wall cylinder stake 1Side, and being formed by the cement mixing pile being piled in the soil body, Specific construction is: passive area every 3m as a reinforcing joint,Reinforcement with Cement-mixed Piles is set, and reinforcing pile 25 arranges three rows, every row's 5 piles, and the diameter of stake is 500mm, pile spacing is 350mm,Row's spacing is 500mm, and projected depth is 10m.
Its concrete construction method comprises the following steps:
(1) water-stop curtain 26 is constructed
The periphery of water-stop curtain 26 in foundation pit enclosure structure, adopts a fairly large number of single water distributing along foundation ditch aroundMud mixing pile surrounds and forms, and adopts secondary grouting Secondary mixing, and stirring-head sinks to being stirred to projected depth for the first time, thenSlip casting on one side promotes stirring-head to design surface absolute altitude on one side, then for the second time stirring-head is sunk to being stirred to projected depth, and again theSecondary slip casting on one side promotes stirring-head to design surface absolute altitude on one side, forms cement mixing pile water stopping curtain 26.
(2) large diameter thin wall cylinder stake 1 is constructed
1. the prefabricated pile crown 2 of large diameter thin wall cylinder stake 1 is embedded between the outer steel cylinder template 7 of interior steel cylinder template 8, described outsideSteel cylinder template 7 is provided with concrete pouring gate 11, and described prefabricated pile crown 2 is exported for taper pile crown and prefabricated pile crown through hole 12Weak soil in sinking process;
2. at the just tube template top mounting clamp device 10 that shakes, be used for fixing dither 9, dither 9 is adjusted in placeAfter, outer interior steel cylinder template 8 steel cylinder template 7 and prefabricated pile crown are pressed in soil to prefabricated pile crown and reach projected depth, described in press downIt is vertical that template procedure needs constantly to adjust pile body;
3. the folder that the unclamps template top device 10 that shakes, puts into annular template chamber by prefabricated steel reinforcement cage 20, by outer steelConcrete pouring gate 11 cast concretes on tube template 7, adopt step pouring, and while hoisting steel tube template, described steelMuscle cage 20 has been reserved the hole 21 in anchor pole duct each layer of Soil Anchor Design position;
4. repeat above-mentioned steps, the next large diameter thin wall cylinder stake 1 of constructing is until the required all fender post constructions of foundation ditchComplete;
5. reach after design strength until fender post concrete, remove the assorted soil at foundation pit enclosure stake top, build enhancing and respectively encloseThe capping beam 3 of fender pile resistance to overturning.
(3) passive area reinforcing pile 25 is constructed
Passive area reinforcing pile 25 is in large diameter thin wall cylinder stake 1 inner side, and by the cement mixing pile structure being piled in the soil bodyBecome, 25 points of passive area reinforcing piles apply work, often apply work as above-mentioned cement-soil stirring pile construction method.
(4) ground floor anchor pole 4 is constructed
1. dig down foundation ditch 13 to the ground floor anchor pole following 1m of 4 designed elevation place, remove clean fender post assorted soil with it;
2. adopt total powerstation to measure setting-out according to design drawing and determine position, Soil Anchor Design hole and anchor hole azimuth, andAt fender post 1 mark with it, described azimuth is consistent with reserving hole 21 angles on the precast reinforced cage of cylinder stake;
3. rig is in place, holes in index aperture position, keeps specific penetration rate in described boring procedure, and it is right to preventThe thin-walled of fender post caused havoc;
4. boring is re-started to inspection before rockbolt installation, to collapse hole, fall piece and clear up;
5. anchor pole is firmly as one man pushed and enters duct 16, in propelling movement process, must not rotate the body of rod, and guarantee anchor poleBody 15 pushes to the predetermined degree of depth;
6. adopt pressure piston formula grouting pump to be in the milk to duct, cement mortar is pushed in hole through Grouting Pipe 19, thenBe in the milk, described filling process is twice grouting, and anchoring section 14 is first poured in grouting for the first time, must keep in anchoring section lengthFill, after anchoring section possesses some strength, free segment 15 is in the milk for the second time, finally inject anchor slurry at nose end;
7. build anchoring supporting plate 17 at bolthole road junction and clamp nut 18 is installed;
(5) second layer anchor pole 5 is constructed
1. dig down foundation ditch to the second layer anchor pole following 1m of 5 designed elevation place;
2. adopt total powerstation to measure setting-out according to design drawing and determine position, Soil Anchor Design hole and anchor hole azimuth, andAt fender post 1 mark with it, described azimuth is consistent with reserving hole 21 angles on the precast reinforced cage of cylinder stake;
3. rig is in place, holes in index aperture position, keeps specific penetration rate in described boring procedure, and it is right to preventThe thin-walled of fender post caused havoc;
4. boring is re-started to inspection before rockbolt installation, to collapse hole, fall piece and clear up;
5. anchor pole is firmly as one man pushed and enters duct 16, in propelling movement process, must not rotate the body of rod, and guarantee anchor poleBody pushes to the predetermined degree of depth, and the body of rod reinforcing bar 22 of the second layer anchor pole 5 of reserved certain length is outside duct 16 simultaneously; ;
6. adopt pressure piston formula grouting pump to be in the milk to duct, cement mortar is pushed in hole through Grouting Pipe 19, thenBe in the milk, described filling process is twice grouting, and anchoring section 14 is first poured in grouting for the first time, must keep anchoring section 14 lengthInside fill, the free segment 15 to anchor pole after anchoring section 14 possesses some strength is in the milk for the second time, finally injects at nose endAnchor slurry.
(6) ground floor encloses purlin 6 and constructs
1. the body of rod reinforcing bar outside duct reserved second layer anchor pole 22 and ground floor are enclosed to 23 colligations of purlin reinforcing bar, described theTwo layers of reserved body of rod reinforcing bar 22 are designed to all be cast in ground floor and enclose in purlin 6 bodies, anchor pole and enclose assembling reinforcement between purlin reinforcing bar and beHigh tensile steel wire 24;
2. the template that ground floor encloses purlin 6 is installed, and casting concrete;
By above construction, foundation pit enclosure structure of the present invention.
Referring to Fig. 1 ~ Fig. 7. The present invention can also have other embodiment, and foundation pit enclosure structure has multilayer as three layers of anchor pole5 with the two-layer purlin 6 that encloses, its construction method is specific as follows:
(1) cement mixing pile water stopping curtain 26 is constructed
(2) large diameter thin wall cylinder stake 1 is constructed
(3) passive area reinforcing pile 25 is constructed
(4) ground floor anchor pole 4 is constructed
(5) second layer anchor pole 5 is constructed
(6) ground floor encloses purlin 6 and constructs
[a same construction example of above-mentioned (1) ~ (6) construction procedure]
(7) the 3rd layers of anchor bolt construction
1. dig down the three layers of following 1m of Soil Anchor Design absolute altitude place of foundation ditch to the;
2. repeat in above-mentioned (2) 2. ~ work progress (do not need to build supporting plate and clamp nut is installed) 6., reserved certainThe body of rod reinforcing bar of length is outside duct;
(8) second layer encloses purlin construction
1. by the body of rod reinforcing bar outside the 3rd layer of duct that anchor pole is reserved with enclose purlin reinforcing bar binding, the 3rd layer of described reserved barBody reinforcing bar is designed to all be cast in the second layer and encloses in purlin body, anchor pole and to enclose assembling reinforcement between purlin reinforcing bar be high tensile steel wire;
2. the template that the second layer encloses purlin is installed, and casting concrete;
By above construction, another embodiment of foundation pit enclosure structure of the present invention.

Claims (1)

1. a construction method for large diameter thin wall cylinder stake compound anchor rod-type foundation pit enclosure structure, is characterized in that: comprise followingConstruction procedure:
(1) water-stop curtain construction
The periphery of water-stop curtain in foundation pit enclosure structure, adopts a fairly large number of single cement distributing along foundation ditch to stir aroundMix stake and surround formation;
(2) large diameter thin wall cylinder pile driving construction
1. the prefabricated pile crown of large diameter thin wall cylinder stake is embedded between interior steel cylinder template and outer steel cylinder template;
2. at the steel cylinder template top mounting clamp device that shakes, be used for fixing dither, dither adjust in place after, by interior steelTube template and outer steel cylinder template and prefabricated pile crown are pressed into the interior extremely prefabricated pile crown of soil and reach projected depth;
3. the folder that the unclamps template top device that shakes, puts into annular template chamber by prefabricated steel reinforcement cage, in outer steel cylinder templateConcrete pouring gate cast concrete, and hoisting steel tube template simultaneously; It is required that described precast reinforced cage has been reserved anchor pole ductHole, for anchor pole can be to cylinder, stake destroys minimum in the situation that compound with it through cylinder stake; In construction procedure (2)-3.Pouring concrete is step pouring segmentation jolt ramming, steel form segmentation lifting;
4. repeat above-mentioned steps, the next large diameter thin wall cylinder stake of constructing is until required all the going along with sb. to guard him of foundation ditch used large diameter thin wallCylinder pile driving construction is complete;
5. reach after design strength until fender post concrete, remove the assorted soil at foundation pit enclosure stake top, build and strengthen each fender postThe capping beam of resistance to overturning;
(3) passive area reinforcing pile construction
Passive area reinforcing pile is in large diameter thin wall cylinder stake inner side, and is made up of the cement mixing pile being piled in the soil body;
(4) ground floor anchor bolt construction
1. dig down foundation ditch to the following 1m of ground floor Soil Anchor Design absolute altitude place;
2. adopt total powerstation to measure setting-out according to design drawing and determine position, Soil Anchor Design hole and anchor hole azimuth, and enclosingFender pile is mark with it;
3. rig is in place, holes in index aperture position;
4. anchor pole is firmly as one man pushed and enters duct, in propelling movement process, must not rotate the body of rod; Adopt the slip casting of pressure piston formulaPump is in the milk to duct, cement mortar, in Grouting Pipe pushes hole, is then in the milk, and builds anchoring at bolthole road junctionSupporting plate is also installed clamp nut;
(5) second layer anchor bolt construction
1. dig down foundation ditch to the following 1m of second layer Soil Anchor Design absolute altitude place;
2. adopt total powerstation to measure setting-out according to design drawing and determine position, Soil Anchor Design hole and anchor hole azimuth, and enclosingFender pile is mark with it;
3. rig is in place, holes in index aperture position;
4. anchor pole is firmly as one man pushed and enters duct, in propelling movement process, must not rotate the body of rod; Adopt the slip casting of pressure piston formulaPump is in the milk to duct, and cement mortar, in Grouting Pipe pushes hole, is then in the milk; The anchor pole of reserved certain lengthBody of rod reinforcing bar is outside duct;
(6) ground floor encloses purlin construction
1. body of rod reinforcing bar and ground floor outside the second reserved duct of second layer anchor pole are enclosed to purlin reinforcing bar binding;
2. the template that ground floor encloses purlin is installed, and casting concrete.
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