CN102286972A - Variable cross-section expander for construction of full-pile-length variable cross-section cast-in-place piles and construction method thereof - Google Patents
Variable cross-section expander for construction of full-pile-length variable cross-section cast-in-place piles and construction method thereof Download PDFInfo
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- CN102286972A CN102286972A CN2011101674258A CN201110167425A CN102286972A CN 102286972 A CN102286972 A CN 102286972A CN 2011101674258 A CN2011101674258 A CN 2011101674258A CN 201110167425 A CN201110167425 A CN 201110167425A CN 102286972 A CN102286972 A CN 102286972A
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Abstract
The invention discloses a variable cross-section expander for construction of full-pile-length variable cross-section cast-in-place piles and a construction method thereof. The expander comprises at least two expander units, wherein the diameters of at least two expander units are unequal after being expanded; each expander unit comprises a central screw, forward nuts, backward nuts, support bars, a support beam and an expanded blade; the central screws of all the expander units are connected to form the expander; and the pitches of the central screws and the lengths of the support bars of all the expander units are not fully equal. The variable cross-section expander has the following advantages and effects: variable cross-section pile holes are obtained through one-step expansion, thus the variable cross-section cast-in-place piles are obtained; the expander has lower requirement for the soil property and can cope with the condition of poorer soil bodies; and the variable cross-section piles have various forms and can meet the requirements of different soil bodies.
Description
Technical field
The present invention relates to the variable cross-section filling pile construction device and the job practices thereof in the long squeezed one-tenth non-uniform pile of a kind of full stake hole, belong to the technical field of construction in the civil engineering.
Background technology
The job practices of castinplace pile commonly used mostly is compacted bearing disk pile in the prior art, document [1] sees reference: compacted bearing disk pile is in application in engineering, Wang Zhenling, Shanxi architecture, the 37th the 1st phase of volume, in January, 2011, job practices is after boring (dashing) hole, Counterboring apparatus is put into the hole, utilize a dish to carry out repeatedly squeezed formation non-uniform pile hole, wait operation to form non-uniform pile by perfusion.Yet, during pile to the having relatively high expectations of the soil body, and repeatedly squeezed trivial operations; The non-uniform pile form of Xing Chenging is single simultaneously.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can realize the squeezed device of variable cross-section in the long squeezed one-tenth non-uniform pile of full stake hole and the job practices of corresponding variable cross-section castinplace pile, with the stake of the squeezed acquisition high-bearing capacity in small-bore.Use the squeezed device of variable cross-section provided by the invention and can be lowered into of the requirement of variable cross-section castinplace pile the soil body, and a disposable hole of making.Described job practices is meant implants soil layer with the squeezed device of the cartridge type variable cross-section of contraction state, carries out squeezed operation after the arrival projected depth, and with direct acquisition non-uniform pile hole, the perfusion material of body of a pile can obtain non-uniform pile in the stake hole.
The squeezed device of variable cross-section provided by the invention is made up of at least two squeezed device unit, and the diameter after at least two squeezed device unit extensions is unequal; Described each squeezed device unit comprises center bolt, the forward nut, reverse nut, support bar, brace summer and extended blades, wherein center bolt is made up of for two sections counterscrew and forward screw rod, be with a reverse nut on the counterscrew section, be with a forward nut on the forward screw section, being hinged with quantity respectively on described forward nut and the reverse nut equates, equally distributed some support bars, the support bar formation support bar that is hinged on the correspondence position on forward nut and the reverse nut is right, the right other end of support bar is hinged on the same point on the respective support beam, and brace summer connects extended blades outward; The center bolt of each squeezed device unit is connected to form squeezed device.
The squeezed device of described variable cross-section is made of the different squeezed device of the straight expansion type unit group of expansion back diameter more than two, the squeezed device of described straight expansion type unit group is formed by connecting by at least two squeezed device unit, the pitch of the center bolt of each squeezed device unit is identical, support bar length is identical, squeezed on the same group device units shared brace summer and extended blades.
The squeezed device of described variable cross-section is to be made of at least two the different squeezed device of oblique expansion type unit groups of squeezed back diameter, the squeezed device of described oblique expansion type unit group is formed by connecting by two squeezed device unit, the pitch difference of the center bolt of each squeezed device unit, support bar length difference, squeezed on the same group device units shared brace summer and extended blades.
The squeezed device of described variable cross-section is made of the squeezed device of several straight expansion types unit group and the squeezed device of several oblique expansion types unit group.
The extended blades of each the squeezed device unit in the squeezed device of the described oblique expansion type unit group is fan-shaped.
Use the above-mentioned squeezed device of variable cross-section and carry out squeezed filling pile construction, job practices is: the squeezed device of variable cross-section that will be in deflated state is implanted soil layer, squeezed by squeezed device, the disposable non-uniform pile hole that obtains, the perfusion material of body of a pile obtains the variable cross-section castinplace pile in the non-uniform pile hole.
The present invention has following advantage and effect:
(1) the present invention is by disposable squeezed acquisition non-uniform pile hole, thereby obtains the variable cross-section castinplace pile;
(2) squeezed device of variable cross-section provided by the invention and job practices thereof are lower to the requirement of soil property, can tackle the relatively poor situation of the soil body;
(3) non-uniform pile various informative in the job practices provided by the invention can be satisfied the requirement of the different soil bodys.
Description of drawings
Squeezed preceding vertical section, the squeezed device of Fig. 1 a～1d---directly expansion type unit, cross section and vertical section, squeezed back, schematic cross section;
Fig. 2 a～2d---squeezed preceding vertical section, the squeezed device of variable cross-section type unit, vertical view and vertical section, squeezed back, vertical view schematic diagram;
Fig. 3---fan-shaped extended blades schematic diagram;
Fig. 4---triangular base enlarged footing stake hole schematic diagram;
Fig. 5---enlarged footing stake hole, trapezoidal bottom schematic diagram;
Fig. 6---directly expansion type sugarcoated haws stake hole schematic diagram;
Fig. 7---triangle sugarcoated haws stake hole schematic diagram;
Fig. 8---trapezoidal sugarcoated haws stake hole schematic diagram;
Fig. 9---rhombus sugarcoated haws stake hole schematic diagram;
Figure 10---stairstepping stake hole schematic diagram;
Figure 11---tapered pile hole schematic diagram.
Among the figure:
The A counterscrew; The B extended blades; The reverse nut of C; D forward nut; The F brace summer; The G support bar; H forward screw rod; The I center bolt.
The specific embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
The invention provides the squeezed device of a kind of complete long variable cross-section of stake, its structure is composed as follows:
The squeezed device of this variable cross-section is formed by connecting by the squeezed device unit combination of at least two joints, and as shown in Figure 1, each squeezed device unit all mainly is made of center bolt I, reverse nut C, forward nut D, support bar G, brace summer F and extended blades B.Wherein center bolt I is made up of counterscrew A and forward screw rod H.Be with a reverse nut C on the counterscrew A, be with a forward nut D on the forward screw rod H.It is right that a pair of forward and reverse nut D, the last correspondence of C are hinged with equal several support bars G formation support bar of quantity.The right other end of support bar is hinged on the same point on the brace summer F, and brace summer F connects extended blades B outward.Hinged support bar G evenly distributes on described reverse nut C or forward nut D.When being in contraction state, mutual lapping between the extended blades B, oppositely the distance between nut C and the forward nut D is maximum, when center of rotation screw rod I makes that squeezed device is expanded, head and the tail overlap joint between the extended blades B, oppositely the distance between nut C and the forward nut D diminishes gradually, forms needed expansion diameter.
When the brace summer F and the extended blades B of adjacent squeezed device unit are consecutive hours, if the pitch of center bolt I is identical and support bar G length is identical, be straight barrel type after the then squeezed device unit extensions, be referred to as directly to expand type (being called for short the I type), shown in Fig. 1 a～1d, Fig. 1 a is a squeezed preceding vertical section schematic diagram, and Fig. 1 b is squeezed preceding schematic cross section, Fig. 1 c is vertical section, a squeezed back schematic diagram, and Fig. 1 d is a squeezed back schematic cross section.When the brace summer F and the extended blades B of adjacent squeezed device unit are consecutive hours, if the pitch difference of adjacent squeezed device unit center screw rod I and the length difference of support bar G, become circular platform type after then squeezed, shown in Fig. 2 a, 2b, 2c, 2d, be called oblique expansion type.Tiltedly the extended blades B of the squeezed device of expansion type unit can be designed to the fan-shaped or fan-shaped globoidal structure of class, as shown in Figure 3.The length of pitch by changing squeezed device unit center screw rod and support bar (or support bar to), in the time of can rotating equal angular at the center bolt I of squeezed device, make the expansion diameter difference of each squeezed device unit, can obtain the squeezed device of different-diameter after promptly squeezed.By adopting the various combination form of different squeezed devices unit, can obtain to satisfy the different squeezed devices of variable cross-section that require.
The squeezed device of variable cross-section provided by the invention can be made of the squeezed device of several straight expansion types unit group and the squeezed device of several oblique expansion types unit group, also can constitute, perhaps constitute by at least two the different squeezed device of oblique expansion type unit groups of squeezed back diameter by the different squeezed device of the straight expansion type unit group of expansion back diameter more than two.
The squeezed device of described straight expansion type unit group is formed by connecting by at least two squeezed device unit, and the pitch of the center bolt I of each squeezed device unit is identical, and support bar G length is identical, squeezed on the same group device units shared brace summer F and extended blades B.
The squeezed device of described oblique expansion type unit group is formed by connecting the pitch difference of the center bolt I of each squeezed device unit, support bar G length difference, squeezed on the same group device units shared brace summer F and extended blades B by two squeezed device unit.The long squeezed variable cross-section cast-in-place pile construction method of a kind of full stake of the present invention can be realized in the following way:
The first step: the squeezed device of the variable cross-section that is in contraction state that will combine is implanted soil layer to projected depth;
Second step: center of rotation screw rod I drives the reverse nut C and the forward nut D relative motion of all squeezed device unit; Order about the support bar G that is hinged on reverse nut C and the forward nut D to outer lug, promote brace summer F and outwards move, brace summer F heads on extended blades B and opens, and extended blades B directly pushes soil layer, until being expanded to squeezed device design shape, shown in Fig. 1 c, Fig. 2 c;
The 3rd step: pour into a mould material of body of a pile, upwards pack up squeezed device, promptly finish the construction of the long squeezed variable cross-section castinplace pile of full stake.Wherein, look soil condition, squeezed device can be packed up before material of body of a pile is built, and also can pack up after material of body of a pile is built.Better when soil condition, after the reaming can support oneself in the stake hole, when a stake Kong Buhui caved in after squeezed device was packed up, then can pack up squeezed device earlier, builds material of body of a pile then.If soil condition is bad, the stake hole is not able to support oneself after the reaming, and squeezed device is packed up stake hole, the back hole wall soil body and can be caved in, and then can build material of body of a pile earlier, packs up squeezed device then.Like this, lower to the requirement of soil property, can tackle the relatively poor situation of the soil body, can satisfy the squeezed requirement of the different soil bodys.
Embodiment one:
Engineering place soil layer is stream plastic state silt clay.Each parts of squeezed device adopt aluminium alloys to make, and triangular base enlarged footing pile hole extruding-extending device is formed by the squeezed device of several I unit and the squeezed device unit combination of several II types.Squeezed device has a unified diameter 150mm under contraction state, squeezed upper back stake bore dia 200mm, and the enlarged footing maximum gauge is 380mm.Designing pile length 10m, enlarged footing part longitudinal size is 1.5m.The squeezed device that will be in contraction state with the static pressure mode is pressed in the soil, and it is down the higher argillic horizon of bearing capacity, the high-bearing capacity at the bottom of can giving full play to.Rotating squeezed device center bolt I makes it extend to intended diameter, form the non-uniform pile hole, in the non-uniform pile hole of squeezed formation, build the C20 concrete, reverse rotation center bolt I also upwards packs up reamer, finish the construction of the long squeezed plain concrete castinplace pile of full stake, as shown in Figure 4, be triangular base enlarged footing stake hole schematic diagram, squeezed device is made of the squeezed device of straight expansion type unit group and the oblique squeezed device of expansion type unit group, the straight squeezed device of expansion type unit group is formed by connecting by four squeezed device unit, the pitch of the center bolt I of each squeezed device unit is identical, and support bar G length is identical, squeezed on the same group device units shared brace summer F and extended blades B; Tiltedly the squeezed device of expansion type unit group is formed by connecting by two squeezed device unit, the pitch difference of the center bolt I of each squeezed device unit, support bar G length difference, squeezed on the same group device units shared brace summer F and extended blades B, the minimal expansion diameter of the squeezed device of tiltedly expansion type unit group equals directly to expand the expansion diameter of the squeezed device of type unit group.
Embodiment two:
Engineering place soil layer is the mouldable state silty clay.Squeezed device adopts low-alloy carbon steel to make, and I-2 type squeezed device unit and 1～2 squeezed device unit combination of II type that the squeezed device of the I-1 type unit that trapezoidal bottom enlarged footing pile hole extruding-extending device is a by several squeezed back diameters, several squeezed back diameters are b form.As shown in Figure 5, two I-2 are different with the support bar G length and the center bolt I pitch of the squeezed device of I-2 type unit.Squeezed device is diameter 100mm under contraction state, squeezed upper back stake bore dia 150mm, and trapezoidal enlarged footing diameter is 260mm.Designing pile length 20m, the longitudinal size after the squeezed device unit combination of II type is 1m, diameter is that longitudinal size is 4m after the squeezed device unit combination of the I-2 type of b=260mm.With rig drill diameter 110mm hole, the squeezed device that will be in contraction state is pressed in the hole.Rotating squeezed device center bolt makes it extend to intended diameter, reverse rotation is also upwards packed up reamer, form the non-uniform pile hole, as shown in Figure 5, the squeezed device of variable cross-section that adopt in the non-uniform pile hole is by the first straight expansion type squeezed device unit group (I-1), the oblique squeezed device of the expansion type unit group (II) and the second straight expansion type squeezed device unit group (I-2), and the expansion diameter of the squeezed device of first straight expansion type unit group is greater than the expansion diameter of the squeezed device of second straight expansion type unit group, in the non-uniform pile hole of squeezed formation, place reinforcing cage, build the C20 concrete, finish the construction of the long squeezed deposited reinforced concrete pile of full stake.
Embodiment three:
Engineering place soil layer is stream plastic state mud matter silty clay.Squeezed device adopts high-strength engineering plastics to make, straight expansion type sugarcoated haws pile hole extruding-extending device is made of the squeezed device of several straight expansion types unit group, be that the squeezed device of the I-1 type unit group (the squeezed device of directly expansion type unit group) that squeezed back diameter is a is the alternate composition of the squeezed device of I-2 type unit group (the squeezed device of directly expansion type unit group) of b with squeezed back diameter, the I-1 type is different with the support bar G length and the center bolt I pitch of the squeezed device of I-2 type unit group, and the pitch of Nei center bolt I is identical with the length of support bar G on the same group.Squeezed device is diameter 150mm under contraction state, squeezed back diameter a=230mm and b=320mm, designing pile length 15m.Adopt vibration exciter will be in the squeezed device injection soil of contraction state.Rotating squeezed device center bolt makes it extend to intended diameter, form the non-uniform pile hole, as shown in Figure 6, it is straight expansion type arranging in turn according to I-1 type-I-2 type that squeezed device cell type is adopted in the non-uniform pile hole, wherein the I-1 type is different with the diameter of I-2 type, build fluidised form cement and native mix to the non-uniform pile hole of squeezed formation, reverse rotation is also upwards packed up reamer, finishes the construction of the long squeezed cement-soil castinplace pile of full stake.Wherein cement-soil mix sclerosis back unconfined compression strength is greater than 1.5MPa.
Embodiment four:
Engineering place soil layer is the mouldable state silty clay.Squeezed device adopts low-alloy carbon steel to make, and triangle sugarcoated haws pile hole extruding-extending device is by the squeezed device of I type unit group and alternate the combining of the squeezed device of II type unit group.Squeezed device is diameter 90mm under contraction state, squeezed back minimum diameter 130mm, maximum gauge 200mm, designing pile length 20m.With rig drill diameter 100mm hole, the squeezed device that will be in contraction state is pressed in the hole.Rotating squeezed device center bolt I makes it extend to intended diameter, reverse rotation is also upwards packed up reamer, form the non-uniform pile hole, as shown in Figure 7, the squeezed device that adopt in the non-uniform pile hole is made of alternately the squeezed device of straight expansion type unit group and the oblique squeezed device of expansion type unit group, tiltedly the minimum squeezed diameter of the squeezed device of expansion type unit group equals directly to expand the squeezed diameter of the squeezed device of type unit group, and the expansion diameter of the every group of squeezed device of directly expansion type unit group is identical.In the stake hole of squeezed formation, place reinforcing cage, build the C20 concrete, finish the construction of the long squeezed deposited reinforced concrete pile of full stake.
Embodiment five:
Engineering place soil layer is the mouldable state silty clay.Squeezed device adopts titanium alloy to make, and the squeezed device of the I-1 type unit that trapezoidal sugarcoated haws pile hole extruding-extending device is a by squeezed back diameter, II type squeezed device unit and squeezed back diameter are alternate the combining in the squeezed device of I-2 type unit of b.The I-1 type is different with the support bar G length and the center bolt I pitch of the squeezed device of I-2 type unit.Squeezed device is diameter 400mm under contraction state, squeezed back minimum diameter 550mm, maximum gauge 800mm, designing pile length 40m.With spiral drilling machine drill diameter 420mm hole, the squeezed device that will be in contraction state is pressed in the hole.Rotating squeezed device center bolt I makes it extend to intended diameter, form the non-uniform pile hole, as shown in Figure 8, the squeezed device that adopt in described non-uniform pile hole is by three first straight expansion type squeezed device unit groups (I-1), three second straight expansion type squeezed device unit groups (I-2) and three the squeezed device of oblique expansion type unit groups constitute alternately, the expansion diameter of the squeezed device of first straight expansion type unit group is less than the expansion diameter of the squeezed device of second straight expansion type unit group, and the minimal expansion diameter of the squeezed device of tiltedly expansion type unit group equals the expansion diameter of the squeezed device of first straight expansion type unit group, and the largest extension diameter of the squeezed device of tiltedly expansion type unit group equals the expansion diameter of the squeezed device of second straight expansion type unit group.Reverse rotation is also upwards packed up squeezed device, places reinforcing cage in the stake hole of squeezed formation, builds the C25 concrete, finishes the construction of the long squeezed deposited reinforced concrete pile of full stake.
Embodiment six:
Engineering place soil layer is the mouldable state silty clay.Squeezed device adopts low-alloy carbon steel to make, and rhombus sugarcoated haws pile hole extruding-extending device is by the squeezed device of I type unit, the squeezed device of the II type unit II-1 that is just putting and alternate the combining of inverted II type squeezed device unit II-2.The screw thread of II-1 type and the squeezed device unit center of II-2 type screw rod I is opposite.Squeezed device is diameter 300mm under contraction state, squeezed back minimum diameter 450mm, maximum gauge 800mm, designing pile length 20m.With rig drill diameter 310mm hole, the squeezed device that will be in contraction state is pressed in the hole.Rotating squeezed device center bolt I makes it extend to intended diameter, reverse rotation is also upwards packed up squeezed device, form the non-uniform pile hole, as shown in Figure 9, the squeezed device that adopt in described non-uniform pile hole is by three the identical squeezed device of straight expansion type unit groups of expansion diameter, three first oblique expansion type squeezed device unit groups and three the second squeezed device of oblique expansion type unit groups constitute alternately, wherein, the minimal expansion diameter of the squeezed device of first and second oblique expansion types unit group equals directly to expand the expansion diameter of the squeezed device of type unit group, and the largest extension diameter of the squeezed device of first oblique expansion type unit group equals the expansion diameter of the squeezed device of second oblique expansion type unit group.In the stake hole of squeezed formation, place reinforcing cage, build the C20 concrete, finish the construction of the long squeezed deposited reinforced concrete pile of full stake.
Embodiment seven:
Engineering place soil layer is stream plastic state silt clay.Squeezed device adopts aluminium alloys to make, and stairstepping pile hole extruding-extending device is formed by the squeezed device unit combination of I type that several squeezed back diameters successively decrease successively.The support bar length of squeezed device unit and center bolt pitch difference.And from top to bottom, the expansion diameter of squeezed device unit, squeezed back reduces gradually.Squeezed device is diameter 300mm under contraction state, squeezed after timber pile bore dia 750mm, paxilla bore dia is 400mm.Designing pile length 10m.The squeezed device that will be in contraction state with the static pressure mode is pressed in the soil.Rotating squeezed device center bolt I makes it extend to intended diameter, form the non-uniform pile hole, as shown in figure 10, the squeezed device that adopt in described non-uniform pile hole is made of three the squeezed device of straight expansion type unit groups, the expansion diameter of the squeezed device of each straight expansion type unit group successively decreases successively, forms stepped.Build the C20 concrete in the non-uniform pile hole of squeezed formation, reverse rotation center bolt I also upwards packs up reamer, finishes the construction of the long squeezed plain concrete castinplace pile of full stake.
Embodiment eight:
Engineering place soil layer is the mouldable state silty clay.Squeezed device adopts low-alloy carbon steel to make, and taper pile hole extruding-extending device is formed by the squeezed device unit combination of II type that several squeezed back diameters successively decrease successively.The support bar length of squeezed device unit and center bolt pitch difference.Squeezed device is diameter 80mm under contraction state, squeezed back maximum gauge 170mm, minimum diameter 90mm, designing pile length 15m.With rig drill diameter 90mm hole, the squeezed device that will be in contraction state is pressed in the hole.Rotating squeezed device center bolt I makes it extend to intended diameter, reverse rotation center bolt I is to contracted diameter and upwards pack up reamer, form the non-uniform pile hole, as shown in figure 11, described squeezed device constitutes the expansion diameter difference of the squeezed device of each tiltedly expansion type unit group by the squeezed device of several oblique expansion types unit group.In the non-uniform pile hole of squeezed formation, build the C20 concrete, finish the construction of the long squeezed plain concrete castinplace pile of full stake.
On the basis of the foregoing description, the method of non-uniform pile provided by the invention hole or castinplace pile, can adopt the squeezed device of some groups of directly expansion types unit group and the tiltedly squeezed device realization of any combination formation of the squeezed device of expansion type unit group, formation meets engine request or meets the non-uniform pile hole of soil layer requirement, no matter the squeezed device of the sort of form, has unified contracted diameter in the squeezed device of contraction state, be convenient to squeezed device is pressed in the corresponding soil layer, expansion diameter after the expansion satisfies different squeezed diameter and shape need for becoming diameter.
Claims (6)
1. squeezed device of variable cross-section that is used for the long variable cross-section filling pile construction of full stake, it is characterized in that: the squeezed device of described variable cross-section is made up of at least two squeezed device unit, and the diameter after at least two squeezed device unit extensions is unequal; Described each squeezed device unit comprises center bolt, the forward nut, reverse nut, support bar, brace summer and extended blades, wherein center bolt is made up of for two sections counterscrew and forward screw rod, be with a reverse nut on the counterscrew section, be with a forward nut on the forward screw section, being hinged with quantity respectively on described forward nut and the reverse nut equates, equally distributed some support bars, the support bar formation support bar that is hinged on the correspondence position on forward nut and the reverse nut is right, the right other end of support bar is hinged on the same point on the respective support beam, and brace summer connects extended blades outward; The center bolt of each squeezed device unit is connected to form squeezed device.
2. a kind of squeezed device of variable cross-section that is used for the long variable cross-section filling pile construction of full stake according to claim 1, it is characterized in that: the squeezed device of described variable cross-section is made of the different squeezed device of the straight expansion type unit group of expansion back diameter more than two, the squeezed device of described straight expansion type unit group is formed by connecting by at least two squeezed device unit, the pitch of the center bolt of each squeezed device unit is identical, support bar length is identical, squeezed on the same group device units shared brace summer and extended blades.
3. a kind of squeezed device of variable cross-section that is used for the long variable cross-section filling pile construction of full stake according to claim 1, it is characterized in that: the squeezed device of described variable cross-section is to be made of at least two the different squeezed device of oblique expansion type unit groups of squeezed back diameter, the squeezed device of described oblique expansion type unit group is formed by connecting by two squeezed device unit, the pitch difference of the center bolt of each squeezed device unit, support bar length difference, squeezed on the same group device units shared brace summer and extended blades.
4. a kind of squeezed device of variable cross-section that is used for the long variable cross-section filling pile construction of full stake according to claim 1, it is characterized in that: the squeezed device of described variable cross-section is made of the squeezed device of several straight expansion types unit group and the squeezed device of several oblique expansion types unit group.
5. according to claim 3 or 4 described a kind of squeezed devices of variable cross-section that are used for the long variable cross-section filling pile construction of full stake, it is characterized in that: the extended blades of each the squeezed device unit in the squeezed device of the described oblique expansion type unit group is fan-shaped globoidal structure.
6. the job practices that is used for the squeezed device of variable cross-section of the long variable cross-section filling pile construction of full stake, it is characterized in that: the squeezed device of variable cross-section that will be in deflated state is implanted soil layer, squeezed by squeezed device, the disposable non-uniform pile hole that obtains, the perfusion material of body of a pile obtains the variable cross-section castinplace pile in the non-uniform pile hole.
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| CN2011101674258A CN102286972A (en) | 2011-06-21 | 2011-06-21 | Variable cross-section expander for construction of full-pile-length variable cross-section cast-in-place piles and construction method thereof |
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| CN2011101674258A CN102286972A (en) | 2011-06-21 | 2011-06-21 | Variable cross-section expander for construction of full-pile-length variable cross-section cast-in-place piles and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107740307A (en) * | 2017-10-27 | 2018-02-27 | 中铁西北科学研究院有限公司 | A kind of quick ground extruding device of existing line base and reinforcement means |
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| JPS59106621A (en) * | 1982-12-10 | 1984-06-20 | Yukio Matsumoto | Construction of hollow concrete pile |
| JPS60261829A (en) * | 1984-06-09 | 1985-12-25 | Narimoto Matsubara | Excavating device and method using hole bottom enlarging bucket |
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| CN107740307A (en) * | 2017-10-27 | 2018-02-27 | 中铁西北科学研究院有限公司 | A kind of quick ground extruding device of existing line base and reinforcement means |
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Application publication date: 20111221 |