CN101691752B - Construction method for connecting part of PHC tubular piles - Google Patents

Construction method for connecting part of PHC tubular piles Download PDF

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Publication number
CN101691752B
CN101691752B CN2009101540025A CN200910154002A CN101691752B CN 101691752 B CN101691752 B CN 101691752B CN 2009101540025 A CN2009101540025 A CN 2009101540025A CN 200910154002 A CN200910154002 A CN 200910154002A CN 101691752 B CN101691752 B CN 101691752B
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CN
China
Prior art keywords
phc pile
pile tube
connector
tube
stretch
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CN2009101540025A
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Chinese (zh)
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CN101691752A (en
Inventor
查支祥
刘玮
王霞
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浙江大学宁波理工学院
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Priority to CN2009101540025A priority Critical patent/CN101691752B/en
Publication of CN101691752A publication Critical patent/CN101691752A/en
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Publication of CN101691752B publication Critical patent/CN101691752B/en

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Abstract

The invention discloses a construction method for a connecting part of PHC tubular piles, which is characterized in that: the circumferential positioning of two butted PHC tubular piles (8) on each layer is carried out through a connecting piece (7); and the inside and outside of a pipe wall of the connecting part of the PHC tubular piles (8) on each layer are grouted from the bottom up. The construction method for the connecting part of the PHC tubular piles ensures good connecting effect between the PHC tubular piles (8) and low cost.

Description

The job practices of the junction of PHC pile tube

Technical field

The present invention relates to the job practices of pile foundation in a kind of civil engineering, specifically is a kind of job practices of junction of the PHC pile tube (full name prestressed high strength concrete pile tube) when the weak soil environment is constructed.

Background technology

In civil engineering the PHC pile tube with its bearing capacity of single pile height, advantage becomes in industrial construction or the civilian construction important foundation form such as cost is low, speed of application is fast.

The PHC pile tube of prior art comprises the pile tube body of reinforced concrete structure cylindraceous and is fixed on the end plate at pile tube body two ends, described end plate is provided with several paired screwed hole and through holes, and described through hole is parallel with screwed hole radial communication and both axis.

The job practices of the junction of the PHC pile tube of prior art is as follows:

A, placement lower bolster; B, the reinforcing cage that colligation is good are placed on the lower bolster, pass the screwed hole of end plate behind the longitudinal reinforcement two ends heading with reinforcing cage, and be traversing to through hole from screwed hole again; C, the stretch-draw plate being fixed on the two end plates outside at PHC pile tube two ends, specifically is to screw in the screwed hole of end plate after screw is passed the through hole of stretch-draw plate; D, outside PHC pile tube two ends stretch-draw stretch-draw plate, and the stretch-draw plate after the stretch-draw is fixed on the lower bolster, again fluid concrete; E, cope match-plate pattern is closed up on lower bolster; F, rotation reinforcing cage and mould (being upper and lower template, two blocks of stretch-draw plates and two end plates) make concrete form the tubular of hollow under centrifugal action; G, in the steam pond curing concrete; H, after concrete strength reaches designing requirement, disassemble the stretch-draw plate, the stretching force that this moment, the longitudinal reinforcement on the reinforcing cage provided because of the stretch-draw plate disappears and shrinks, and then by the bonding between reinforcing bar and the concrete concrete is compressed, the preparation of PHC pile tube is finished; I, an end and the pile crown of a PHC pile tube for preparing are fixed, this PHC pile tube is squeezed into weak soil, expose ground with convenient construction until this PHC pile tube upper end certain-length with pile driver; J, with pile driving frame with the top of another root PHC pile tube handling to the PHC pile tube that exposes ground, and make two pile tubes alignment; K, constructor circumferentially weld the adjacent end plate of two PHC pile tubes along the PHC pile tube, make two PHC pile tubes connect; L, squeeze into weak soil, expose ground with convenient construction until this PHC pile tube upper end certain-length with the pile driver PHC pile tube that the position is the highest; M, repeating step j~l repeatedly, the number of the PHC pile tube in being driven into weak soil reaches designing requirement.

There is following defective in the job practices of the junction of the PHC pile tube of above-mentioned prior art:

At first, owing to be subjected to the restriction of construction condition and welding procedure, phenomenons such as the easy appearance of the weld seam between the end plate is discontinuous, not full, weld seam slag inclusion, and, after finishing, welding is subjected to the duration restriction, its dead time short (if waiting until that weld seam cools off piling more fully and can incur loss through delay the duration), the weld seam of cooling will not occur embrittlement along with pile tube is driven into weak soil in case the weld seam of this moment is met underground water fully; So the junction between the PHC pile tube of prior art is too concentrated because of local stress easily, causes complications even fracture, promptly the junction of PHC pile tube is vertically all not enough to anti-pulling capacity and resistance to compression bearing capacity, and the connection effect between the PHC pile tube is undesirable.Secondly, also because the cost of end plate generally accounts for 10%~20% of PHC pile tube total cost, so its cost is higher relatively.

Summary of the invention

The technical problem to be solved in the present invention is, the job practices of the junction of the low relatively PHC pile tube of good connecting effect between a kind of PHC of making pile tube and cost is provided.

Technical solution of the present invention is, a kind of job practices of junction of PHC pile tube is provided, and its step is as follows:

(1), prepares a plurality of two ends and do not have the PHC pile tubes that end plate and each end are provided with at least three short slots that extend vertically;

(2), prepare a plurality of placing and make circumferentially location and can be of two PHC pile tubes between the two PHC pile tubes to the connector of the inside and outside slip casting of tube wall of two PHC pile tube junctions;

(3), an end and the pile crown of a PHC pile tube are fixed, this PHC pile tube is squeezed into weak soil, expose ground with convenient follow-up construction until this PHC pile tube upper end certain-length with pile driver;

(4), make two the highest PHC pile tubes of position circumferentially locate to the top of the PHC pile tube that exposes ground and by connector grouting pipe section and the handling of another root PHC pile tube just, and install grouting pipe section just with hanging device;

(5), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube upper end certain-length with the pile driver PHC pile tube that the position is the highest;

(6), make two the highest PHC pile tubes of position circumferentially locate to the top of the PHC pile tube that exposes ground and by another connector another grouting pipe section and the handling of another root PHC pile tube, and install the grouting pipe section of this layer with hanging device;

(7), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube upper end certain-length with the pile driver PHC pile tube that the position is the highest;

(8), repeating step 6~7 repeatedly, the number of the PHC pile tube in being driven into weak soil reaches designing requirement, at this moment, all grouting pipe sections form grouting pipe;

(9), from the bottom up to the inside and outside slip casting of tube wall of the junction of the PHC pile tube of each layer, finish until the inside and outside slip casting of tube wall of the junction of the PHC pile tube of the highest one deck in position.

The concrete operations order of step (1) is as follows:

A, placement lower bolster;

B, prepare several with threaded hole and bell-mouthed stretch-draw joints, described screwed hole is positioned at the horn mouth outside and both coaxial lines;

C, at least three cuboid battens that extend vertically of the stretch-draw plate installed inside of every circle, described at least three cuboid battens are positioned on the same circumference of stretch-draw plate and at this circumference and evenly distribute;

D, the reinforcing cage that colligation is good are placed on the lower bolster, with every longitudinal reinforcement two ends of reinforcing cage put the stretch-draw joint again heading make that the heading of longitudinal reinforcement is spacing by horn mouth, the screw that will pass the through hole of stretch-draw plate again screws in the screwed hole of stretch-draw joint, and the stretch-draw joint that makes each and longitudinal reinforcement fix is fixed on the side that the stretch-draw plate is equipped with the cuboid batten;

E, fix to PHC pile tube two ends stretch-draw stretch-draw plate and with stretch-draw plate and lower bolster after the stretch-draw, again fluid concrete with tensioner;

F, cope match-plate pattern is closed up on lower bolster;

G, rotation reinforcing cage and mould make concrete form the tubular of hollow under centrifugal action;

H, in the steam pond curing concrete;

I, after concrete strength reaches designing requirement, disassemble the stretch-draw plate, longitudinal reinforcement on the reinforcing cage shrinks because of the stretching force disappearance that the stretch-draw plate provides at this moment, and then concrete is compressed by the bonding between reinforcing bar and the concrete, the preparation of PHC pile tube is finished, and each end of this PHC pile tube forms at least three short slots corresponding with cuboid bar Board position.

Described connector is the structure that roughly is dumbbell shaped that is made of the waist that contracts in the head at two ends and the centre, the external diameter of the head of described connector is slightly less than the internal diameter of PHC pile tube, the length of the waist of described connector is not more than the twice of length of the short slot of every PHC pile tube one end, described connector is through with a through hole along axis, the two ends of described through hole are arranged with two unidirectional funnels that can only flow to osculum from big mouth, and the osculum of each unidirectional funnel is positioned at connector the inner; This connector is fixed with the steel wing plate that at least three length equate with the connector waist, described at least three steel wing plates run through the tube wall of waist and evenly distribute along the circumference of waist, every block of steel wing plate is provided with first passage, second channel that connects thickness direction that connects width and the third channel that connects thickness direction, described first passage and second channel are interconnected, described first passage and third channel are interconnected, and the inlet of described first passage is positioned at the through hole of connector.

The concrete preparation method of described connector is as follows:

The upper shuttering of a, preparation symmetry, following formwork and inner mold, the profile of the cavity shape of described upper shuttering and connector the first half is coincide, the lower end of upper shuttering is provided with and the corresponding slot of steel wing Board position, the shape of the described die cavity of formwork down and the latter half profile of connector are coincide, the upper end of following formwork is provided with and the corresponding slot of steel wing Board position, the periphery of inner mold is provided with the mounting groove that steel wing plate is installed, and the upper and lower end of inner mold is with pre-buried iron ring respectively;

B, on steel wing plate welding transversely strengthening reinforcing bar and longitudinal reinforcement reinforcing bar;

C, will descend formwork and inner mold to fix, insert steel wing plate in the mounting groove and steel wing plate passes slot;

D, upper shuttering and following formwork are fixed, steel wing plate is positioned at the slot of upper and lower formwork at this moment;

E, cast connector make transversely strengthening reinforcing bar and longitudinal reinforcement reinforcing bar be anchored in the concrete;

F, dismounting be formwork, upper shuttering and inner mold down;

Unidirectional funnel is installed on g, the pre-buried iron ring in the through hole that is embedded in connector in advance.

Describedly make the highest two PHC pile tubes in position circumferentially be meant the location by connector, a connector is placed the top of the PHC pile tube that exposes ground, again with hanging device with the top of another root PHC pile tube handling to the PHC pile tube that exposes ground, make the steel wing plate of alignment of two pile tubes and connector be positioned at, down in the short slot of two PHC pile tubes, two outlets of the second channel of every block of steel wing plate are in the inwall and the slit between the connector waist outer wall of PHC pile tube at this moment, and two outlets of the outlet of the first passage of every block of steel wing plate and third channel all are positioned at outside the outer wall of PHC pile tube.

The first section of grouting pipe that installs described in the step (4) is meant, after the top that connector is exposing the PHC pile tube on ground installs, the grout outlet of the first section of grouting pipe is inserted the unidirectional funnel below of the through hole upper end of connector, again another root PHC pile tube is installed in the top of the PHC pile tube that exposes ground, at this moment, the top of the first section of grouting pipe is lower than the top of the highest PHC pile tube in position.

The grouting pipe section that installs this layer described in the step (6) is meant, a joint is installed on top in next grouting pipe section highly, make the top of this joint be higher than the top of the PHC pile tube that exposes ground, connector described in the step (6) is passed this joint, another grouting pipe section described in the installation steps (6) on this joint then, at last, another root PHC pile tube is installed on the top of the PHC pile tube that exposes ground, at this moment, the top of the highest grouting pipe section in position is lower than the top of the highest PHC pile tube in position.

Slip casting from the bottom up described in the step (9) is meant, first unidirectional funnel below on the connector through hole of lowermost layer is to the inside and outside slip casting of the tube wall of this layer junction, take out the length of a PHC pile tube of grouting pipe then, make the grout outlet of grouting pipe rise to the unidirectional funnel below of the connector through hole upper end of a height, again to the inside and outside slip casting of tube wall of junction of a last height, take out grouting pipe and slip casting again, finish until the inside and outside slip casting of tube wall of the junction of the PHC pile tube of the highest one deck in position.

In the tube wall described in the step (9) to the junction of the PHC pile tube of each layer, outer slip casting is meant, slurries are under the effect of unidirectional funnel, earlier the through hole between two unidirectional funnels of connector is filled up, and from the inlet of first passage through first passage, second channel is filled the inwall of full PHC pile tube and the slit between the connector waist outer wall, simultaneously, concrete slurry flows out to the outlet of first passage and two outlets of third channel from the inlet of first passage, makes, near the outer weak soil of the outer wall two PHC pile tube short slots is squeezed and is opened and form the semi-cylindrical concrete down.

The fanning strip that described unidirectional funnel is made by elastomeric material by polylith constitutes, and the circular arc limit of every fanning strip is fixed on the same circle of connector through-hole wall, and the straight flange of the straight flange of every fanning strip and adjacent fanning strip leaves the slit under nature.

The job practices of the junction of PHC pile tube of the present invention compared with prior art has following remarkable advantage and beneficial effect:

Because the job practices of the junction of PHC pile tube of the present invention both made by connector that two adjacent PHC pile tubes were circumferentially spacing; again in the tube wall with every layer of PHC pile tube junction; outward (in the connector through hole; between connector waist outer wall and the PHC pile tube inwall; near the PHC pile tube short slot outer wall is outer) the concrete perfusion slurries; make the concrete after solidifying play the effect of supporting and protecting to the junction of PHC pile tube; like this; avoided the tortuous even fracture of the junction that causes owing to welding procedure defective and limitation of construction; make and junction vertically stronger of PHC pile tube connect better effects if to anti-pulling capacity and resistance to compression bearing capacity.Again because the job practices of the junction of PHC pile tube of the present invention adopts the stretch-draw joint to replace end plate to connect, and the junction of PHC pile tube no longer adopts the method for end plate welding to fix, and the consumable quantity of stretch-draw joint is less than end plate, especially in batch the cost of the stretch-draw joint of the Sheng Chaning end plate higher far below cost is so provide cost savings.

Description of drawings

Fig. 1 is the stretch-draw joint in the job practices of junction of PHC pile tube of the present invention and the structural representation of stretch-draw plate.

Fig. 2 is the structural representation of the cuboid batten in the job practices of junction of PHC pile tube of the present invention when being installed on the stretch-draw plate.

Fig. 3 is the sectional structure schematic diagram of the connector in the job practices of junction of PHC pile tube of the present invention.

Fig. 4 is the structural representation of the connector that fin is installed in the job practices of junction of PHC pile tube of the present invention.

Fig. 5 is the plan structure figure of Fig. 4.

Fig. 6 is the sectional structure chart of Fig. 4 along the A-A line.

Fig. 7 is the preceding structural representation of junction grouting of PHC pile tube of the present invention.

Fig. 8 is the blast structural representation of the junction of PHC pile tube of the present invention.

Fig. 9 be PHC pile tube of the present invention junction grouting after cross section structure for amplifying schematic diagram.

Figure 10 is used for making the upper shuttering of connector, the structural representation of formwork and inner mold down in the job practices of junction of PHC pile tube of the present invention.

Shown in the figure 1, the stretch-draw joint, 2, screwed hole, 3, horn mouth, 4, stretch-draw plate, 5, the cuboid batten, 6, short slot, 7, connector, 7.1, head, 7.2, waist, 8, PHC pile tube, 9, through hole, 10, unidirectional funnel, 11, wing plate, 12, first passage, 13, second channel, 14, transversely strengthening reinforcing bar, 15, longitudinal reinforcement reinforcing bar, 16, the semi-cylindrical concrete, 17, fanning strip, 18, upper shuttering, 19, following formwork, 20, inner mold, 21, slot, 22, mounting groove, 23, third channel.

The specific embodiment

The invention will be further described below in conjunction with the drawings and specific embodiments.

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, shown in Figure 10, the job practices of the junction of PHC pile tube of the present invention, its step is as follows:

(1), prepares a plurality of two ends and do not have the PHC pile tubes 8 that end plate and each end are provided with three short slots 6 that extend vertically; All PHC pile tubes 8 of present embodiment all adopt the prepared PHC pile tube 8 of step 1.

The concrete operations order of step (1) is as follows:

A, placement lower bolster;

B, prepare several with threaded hole 2 and the stretch-draw joint 1 of horn mouth 3, described screwed hole 2 is positioned at horn mouth 3 outsides and both coaxial lines, described stretch-draw joint 1 adopts round steel to form through conventional machine;

C, at three cuboid battens 5 that extend vertically of stretch-draw plate 4 installed inside of every circle, described three cuboid battens 5 are positioned on the same circumference of stretch-draw plate 4 and at this circumference and evenly distribute;

D, the reinforcing cage that colligation is good are placed on the lower bolster, with every longitudinal reinforcement two ends of reinforcing cage put stretch-draw joint 1 again heading make that the heading of longitudinal reinforcement is spacing by horn mouth 3, the screw that will pass the through hole of stretch-draw plate 4 again screws in the screwed hole 2 of stretch-draw joint 1, and the stretch-draw joint 1 that makes each and longitudinal reinforcement fix is fixed on the side that stretch-draw plate 4 is equipped with cuboid batten 5;

E, fix to PHC pile tube 8 two ends stretch-draw stretch-draw plates 4 and with stretch-draw plate after the stretch-draw 4 and lower bolster, be about to stretch-draw plate 4 and be connected on the lower bolster, again fluid concrete with tensioner;

F, cope match-plate pattern is closed up on lower bolster;

G, rotation reinforcing cage and mould make concrete form the tubular of hollow under centrifugal action;

H, in the steam pond curing concrete;

I, after concrete strength reaches designing requirement, disassemble stretch-draw plate 4, longitudinal reinforcement on the reinforcing cage shrinks because of the stretching force disappearance that stretch-draw plate 4 provides at this moment, and then concrete is compressed by the bonding between reinforcing bar and the concrete, the preparation of PHC pile tube 8 is finished, and each end of this PHC pile tube 8 forms three short slots 6 corresponding with cuboid batten 5 positions.

(2), prepare a plurality of placing and make circumferentially location and can be of two PHC pile tubes 8 between the two PHC pile tubes 8 to the connector 7 of the inside and outside slip casting of tube wall of two PHC pile tubes, 8 junctions;

Described connector 7 is the structure that roughly is dumbbell shaped that is made of the waist 7.2 that contracts in the head 7.1 at two ends and the centre, the external diameter of the head 7.1 of described connector 7 is slightly less than the internal diameter of PHC pile tube 8, the length of the waist 7.2 of described connector 7 equals the twice of length of the short slot 6 of every PHC pile tube 8 one ends, described connector 7 is through with a through hole 9 along axis, the two ends of described through hole 9 are arranged with two unidirectional funnels 10 that can only flow to osculum from big mouth, the osculum of each unidirectional funnel 10 is positioned at connector 7 the inners, this connector 7 is fixed with the steel wing plate 11 that three length equate with connector 7 waists 7.2, described three steel wing plates 11 run through the tube wall of waist 7.2 and evenly distribute along the circumference of waist 7.2, every block of steel wing plate 11 is provided with the first passage 12 that connects width, connect the second channel 13 of thickness direction and the third channel 23 of perforation thickness direction, described first passage 12 and second channel 13 are interconnected, described first passage 12 and third channel 23 are interconnected, and the inlet of described first passage 12 is positioned at the through hole 9 of connector 7.

The fanning strip 17 that described unidirectional funnel 10 is made by elastomeric material by polylith constitutes, the circular arc limit of every fanning strip 17 is fixed on the same circle of connector 7 through holes 9 inwalls, and the straight flange of the straight flange of every fanning strip 17 and adjacent fanning strip 17 leaves the slit under nature.Like this, when slurries were positioned at osculum one end of unidirectional funnel 10, slurries can be with adjacent fanning strip 17 jam-packeds, made that the slit between the straight flange of adjacent fanning strip 17 is crowded more little more, and last slit disappears unidirectional funnel 10 complete closed; When slurries were positioned at the big mouthful end of unidirectional funnel 10, slurries can adjacent fanning strip 17 crowded holding, and made that the slit between the straight flange of adjacent fanning strip 17 is crowded more big more, and last unidirectional funnel 10 opens fully.

The concrete preparation method of described connector 7 is as follows:

A, the upper shuttering 18 of preparation symmetry, following formwork 19 and inner mold 20, the profile of the cavity shape of described upper shuttering 18 and connector 7 the first half is coincide, the lower end of upper shuttering 18 is provided with and the corresponding slot 21 in steel wing plate 11 positions, the shape of the described die cavity of formwork 19 down and the latter half profile of connector 7 are coincide, the upper end of following formwork 19 is provided with and the corresponding slot 21 in steel wing plate 11 positions, the periphery of inner mold 20 is provided with the mounting groove 22 that steel wing plate 11 is installed, on the inner mold 20, the lower end is with pre-buried iron ring respectively, and inner mold is by in the removable connection, following two parts constitute, according to common practise, described upper shuttering 18 is provided with the running channel (not shown);

B, on steel wing plate 11 welding transversely strengthening reinforcing bar 14 and longitudinal reinforcement reinforcing bar 15;

C, will descend formwork 19 fixing, insert steel wing plate 11 in the mounting grooves 22 and steel wing plate 11 passes slot 21 with inner mold 20;

D, upper shuttering 18 and following formwork 19 is fixing, steel wing plate 11 is positioned at the slot 21 of upper and lower formwork at this moment;

E, cast connector 7 make transversely strengthening reinforcing bar 14 and longitudinal reinforcement reinforcing bar 15 be anchored in the concrete;

F, dismounting be formwork 19, upper shuttering 18 down, and disassembles upper and lower two parts of inner mold 20 from upper and lower both direction;

Unidirectional funnel 10 is installed on g, the pre-buried iron ring in the through hole 9 that is embedded in connector 7 in advance.

(3), an end and the pile crown of a PHC pile tube 8 are fixed, this PHC pile tube 8 is squeezed into weak soil, expose ground with convenient follow-up construction until this PHC pile tube 8 (being the minimum PHC pile tube 8 in position) upper end certain-length with pile driver;

(4), be that pile driving frame makes two the highest PHC pile tubes 8 of position (owing to two PHC pile tubes 8 only occur before this step to the top of the PHC pile tube 8 that exposes ground (being the minimum PHC pile tube 8 in position) and by connector 7 the first section of grouting pipe and another root PHC pile tube 8 (being position low PHC pile tube 8 second from the bottom) handling with hanging device, so two the highest PHC pile tubes 8 of position just are meant PHC pile tube 8 and the position low PHC pile tube 8 second from the bottom that the position is minimum in this step) circumferentially locate, and install grouting pipe section just;

Describedly make the highest two PHC pile tubes in position 8 circumferentially be meant the location by connector 7, a connector 7 is placed the top of the PHC pile tube 8 that exposes ground, again with hanging device with the top of another root PHC pile tube 8 handlings to the PHC pile tube 8 that exposes ground, make the steel wing plate 11 of alignment of two pile tubes and connector 7 be positioned at, down in the short slot 6 of two PHC pile tubes 8, two outlets of the second channel 13 of every block of steel wing plate 11 are in the inwall and the slit between connector 7 waists 7.2 outer walls of PHC pile tube 8 at this moment, and two outlets of the outlet of the first passage 12 of every block of steel wing plate 11 and third channel 23 all are positioned at outside the outer wall of PHC pile tube 8.

The described first section of grouting pipe that installs is meant, after the top that connector 7 is exposing the PHC pile tube 8 (being the minimum PHC pile tube 8 in position) on ground installs, the grout outlet of the first section of grouting pipe is inserted unidirectional funnel 10 belows of through hole 9 upper ends of connector 7, again another root PHC pile tube 8 (being position low PHC pile tube 8 second from the bottom) is installed in the top of the PHC pile tube 8 that exposes ground, at this moment, the top of the first section of grouting pipe is lower than the top of the highest PHC pile tube 8 in position (being position low PHC pile tube 8 second from the bottom), like this, the piling process of the PHC pile tube 8 that grouting pipe is can impact position the not highest.

(5), squeeze into weak soil, expose ground with convenient follow-up construction until these PHC pile tube 8 upper end certain-lengths with the pile driver PHC pile tube 8 that the position is the highest (being position low PHC pile tube 8 second from the bottom);

(6), with pile driving frame with another grouting pipe section make two the highest PHC pile tubes 8 of position circumferentially locate with 8 handlings of another root PHC pile tube to the top of the PHC pile tube 8 that exposes ground and by another connector 7, and install the grouting pipe section of this layer;

The described grouting pipe section that installs this layer is meant, a joint is installed on top in next grouting pipe section highly, make the top of this joint be higher than the top of the PHC pile tube 8 that exposes ground, connector 7 described in the step (6) is passed this joint, another grouting pipe section described in the installation steps (6) on this joint then, at last, another root PHC pile tube 8 is installed on the top of the PHC pile tube 8 that exposes ground, at this moment, the top of the highest grouting pipe section in position is lower than the top of the highest PHC pile tube 8 in position.

(7), squeeze into weak soil, expose ground with convenient follow-up construction until these PHC pile tube 8 upper end certain-lengths with the pile driver PHC pile tube 8 that the position is the highest;

(8), repeating step 6~7 repeatedly, the number of the PHC pile tube 8 in being driven into weak soil reaches designing requirement, at this moment, all grouting pipe sections form grouting pipe, are meant that specifically all grouting pipe sections alternately are connected with joint, the formation grouting pipe;

(9), from the bottom up to the inside and outside slip casting of tube wall of the junction of the PHC pile tube 8 of each layer, finish until the inside and outside slip casting of tube wall of the junction of the PHC pile tube 8 of the highest one deck in position.

Described slip casting from the bottom up is meant, elder generation is in the tube wall of unidirectional funnel 10 belows (also is unidirectional funnel 10 tops of connector 7 through holes 9 lower ends as can be known by general knowledge) to this layer junction of connector 7 through holes 9 upper ends of lowermost layer, outer slip casting, take out the length of a PHC pile tube 8 of grouting pipe then, make the grout outlet of grouting pipe rise to unidirectional funnel 10 belows of connector 7 through holes 9 upper ends of a height, again in the tube wall of junction to a last height, outer slip casting, take out grouting pipe and slip casting again, in the tube wall of the junction of the PHC pile tube 8 of the highest one deck in position, outer slip casting is finished.

In the tube wall of the junction of described PHC pile tube 8 to each layer, outer slip casting is meant, slurries are under the effect of unidirectional funnel 10, earlier the through hole 9 between 7 two unidirectional funnels 10 of connector is filled up, and from the inlet of first passage 12 through first passage 12, second channel 13 is filled the inwall of full PHC pile tube 8 and the slit between connector 7 waists 7.2 outer walls, simultaneously, concrete slurry flows out to the outlet of first passage 12 and two outlets of third channel 23 from the inlet of first passage 12, makes, near two PHC pile tubes, 8 short slots 6 the outer weak soil of outer wall is squeezed and is opened and form semi-cylindrical concrete 16 down.

Below only just preferred embodiment of the present invention be described, but can not be interpreted as it is restriction to claim.The present invention not only is confined to above embodiment, and its concrete structure allows variation, also can be slightly less than the twice of length of the short slot 6 of every PHC pile tube 8 one ends as: the length of the waist 7.2 of described connector 7; Described cuboid batten 5 can also for more than four or four, short slot 6 can also for more than four or four, steel wing plate 11 can also be four or more; Or the like.All various variations of being done in the protection domain of independent claims of the present invention are all in protection scope of the present invention.

Claims (9)

1. the job practices of the junction of a PHC pile tube, it is characterized in that: its step is as follows:
(1), prepares a plurality of two ends and do not have the PHC pile tubes (8) that end plate and each end are provided with at least three short slots (6) that extend vertically;
(2), prepare a plurality of placing and make circumferentially location and can be of two PHC pile tubes (8) between the two PHC pile tubes (8) to the connector (7) of the inside and outside slip casting of tube wall of two PHC pile tube (8) junctions; Described connector (7) is the structure that roughly is dumbbell shaped that is made of the waist (7.2) that contracts in the head (7.1) at two ends and the centre, the external diameter of the head (7.1) of described connector (7) is slightly less than the internal diameter of PHC pile tube (8), the length of the waist (7.2) of described connector (7) is not more than the twice of length of the short slot (6) of every PHC pile tube (8) one ends, described connector (7) is through with a through hole (9) along axis, the two ends of described through hole (9) are arranged with two unidirectional funnels (10) that can only flow to osculum from big mouth, and the osculum of each unidirectional funnel (10) is positioned at connector (7) the inner; This connector (7) is fixed with the steel wing plate (11) that at least three length equate with connector (7) waist (7.2), described at least three steel wing plates (11) run through the tube wall of waist (7.2) and evenly distribute along the circumference of waist (7.2), every block of steel wing plate (11) is provided with the first passage (12) that connects width, connect the second channel (13) of thickness direction and the third channel (23) of perforation thickness direction, described first passage (12) and second channel (13) are interconnected, described first passage (12) and third channel (23) are interconnected, and the inlet of described first passage (12) is positioned at the through hole (9) of connector (7);
(3), an end and the pile crown of a PHC pile tube (8) are fixed, this PHC pile tube (8) is squeezed into weak soil, expose ground with convenient follow-up construction until this PHC pile tube (8) upper end certain-length with pile driver;
(4), grouting pipe section and another root PHC pile tube (8) handling just made circumferentially location of the highest two PHC pile tubes (8) in position to the top of the PHC pile tube (8) that exposes ground and by connector (7), and install grouting pipe just section with hanging device;
(5), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube (8) upper end certain-length with the pile driver PHC pile tube (8) that the position is the highest;
(6), another grouting pipe section and another root PHC pile tube (8) handling are made circumferentially location of the highest two PHC pile tubes (8) in position to the top of the PHC pile tube (8) that exposes ground and by another connector (7), and install the grouting pipe section of this layer with hanging device;
(7), squeeze into weak soil, expose ground with convenient follow-up construction until this PHC pile tube (8) upper end certain-length with the pile driver PHC pile tube (8) that the position is the highest;
(8), repeating step 6~7 repeatedly, the number of the PHC pile tube (8) in being driven into weak soil reaches designing requirement, at this moment, all grouting pipe sections form grouting pipe;
(9), from the bottom up to the inside and outside slip casting of tube wall of the junction of the PHC pile tube (8) of each layer, finish until the inside and outside slip casting of tube wall of the junction of the PHC pile tube (8) of the highest one deck in position.
2. the job practices of the junction of PHC pile tube according to claim 1 is characterized in that: the concrete operations order of step (1) is as follows:
A, placement lower bolster;
B, prepare the stretch-draw joint (1) of several (2) with threaded hole and horn mouth (3), described screwed hole (2) is positioned at horn mouth (3) outside and both coaxial lines;
C, at least three cuboid battens (5) that extend vertically of stretch-draw plate (4) installed inside of every circle, described at least three cuboid battens (5) are positioned on the same circumference of stretch-draw plate (4) and at this circumference and evenly distribute;
D, the reinforcing cage that colligation is good are placed on the lower bolster, with every longitudinal reinforcement two ends of reinforcing cage put stretch-draw joint (1) again heading make that the heading of longitudinal reinforcement is spacing by horn mouth (3), the screw that will pass the through hole of stretch-draw plate (4) again screws in the screwed hole (2) of stretch-draw joint (1), and the stretch-draw joint (1) that makes each and longitudinal reinforcement fix is fixed on the side that stretch-draw plate (4) is equipped with cuboid batten (5);
E, fix to PHC pile tube (8) two ends stretch-draw stretch-draw plate (4) and with the stretch-draw plate (4) after the stretch-draw and lower bolster, again fluid concrete with tensioner;
F, cope match-plate pattern is closed up on lower bolster;
G, rotation reinforcing cage and mould make concrete form the tubular of hollow under centrifugal action;
H, in the steam pond curing concrete;
I, after concrete strength reaches designing requirement, disassemble stretch-draw plate (4), longitudinal reinforcement on the reinforcing cage shrinks because of the stretching force disappearance that stretch-draw plate (4) provides at this moment, and then concrete is compressed by the bonding between reinforcing bar and the concrete, the preparation of PHC pile tube (8) is finished, and each end of this PHC pile tube (8) forms at least three short slots (6) corresponding with cuboid batten (5) position.
3. the job practices of the junction of PHC pile tube according to claim 1 is characterized in that: the concrete preparation method of described connector (7) is as follows:
A, the upper shuttering (18) of preparation symmetry, following formwork (19) and inner mold (20), the profile of the cavity shape of described upper shuttering (18) and connector (7) the first half is coincide, the lower end of upper shuttering (18) is provided with the slot (21) corresponding with steel wing plate (11) position, the shape of the described die cavity of formwork (19) down and the latter half profile of connector (7) are coincide, the upper end of following formwork (19) is provided with the slot (21) corresponding with steel wing plate (11) position, the periphery of inner mold (20) is provided with the mounting groove (22) that steel wing plate (11) is installed, on the inner mold (20), the lower end is with pre-buried iron ring respectively;
B, go up welding transversely strengthening reinforcing bar (14) and longitudinal reinforcement reinforcing bar (15) at steel wing plate (11);
C, will descend formwork (19) and inner mold (20) fixing, insert steel wing plate (11) in the mounting groove (22) and steel wing plate (11) passes slot (21);
D, upper shuttering (18) and following formwork (19) is fixing, steel wing plate this moment (11) is positioned at the slot (21) of upper and lower formwork;
E, cast connector (7) make transversely strengthening reinforcing bar (14) and longitudinal reinforcement reinforcing bar (15) be anchored in the concrete;
F, dismounting be formwork (19), upper shuttering (18) and inner mold (20) down;
Unidirectional funnel (10) is installed on g, the pre-buried iron ring in the through hole that is embedded in connector (7) in advance (9).
4. the job practices of the junction of PHC pile tube according to claim 1, it is characterized in that: describedly make the highest two PHC pile tubes (8) in position circumferentially be meant the location by connector (7), a connector (7) is placed the top of the PHC pile tube (8) that exposes ground, again with hanging device with the top of another root PHC pile tube (8) handling to the PHC pile tube (8) that exposes ground, make the steel wing plate (11) of alignment of two pile tubes and connector (7) be positioned at, down in the short slot (6) of two PHC pile tubes (8), two outlets of the second channel (13) of every block of steel wing plate this moment (11) are positioned at the inwall of PHC pile tube (8) and the slit between connector (7) waist (7.2) outer wall, and the outlet of the first passage (12) of every block of steel wing plate (11) and two outlets of third channel (23) all are positioned at outside the outer wall of PHC pile tube (8).
5. the job practices of the junction of PHC pile tube according to claim 4, it is characterized in that: the first section of grouting pipe that installs described in the step (4) is meant, after the top that connector (7) is exposing the PHC pile tube (8) on ground installs, the grout outlet of the first section of grouting pipe is inserted unidirectional funnel (10) below of through hole (9) upper end of connector (7), again another root PHC pile tube (8) is installed in the top of the PHC pile tube (8) that exposes ground, at this moment, the top of the first section of grouting pipe is lower than the top of the highest PHC pile tube (8) in position.
6. the job practices of the junction of PHC pile tube according to claim 5, it is characterized in that: the grouting pipe section that installs this layer described in the step (6) is meant, a joint is installed on top in next grouting pipe section highly, make the top of this joint be higher than the top of the PHC pile tube (8) that exposes ground, connector (7) described in the step (6) is passed this joint, another grouting pipe section described in the installation steps (6) on this joint then, at last, another root PHC pile tube (8) is installed on top at the PHC pile tube (8) that exposes ground, at this moment, the top of the highest grouting pipe section in position is lower than the top of the highest PHC pile tube (8) in position.
7. the job practices of the junction of PHC pile tube according to claim 6, it is characterized in that: the slip casting from the bottom up described in the step (9) is meant, elder generation is in the tube wall of unidirectional funnel (10) below to this layer junction of connector (7) through hole (9) upper end of lowermost layer, outer slip casting, take out the length of a PHC pile tube of grouting pipe (8) then, make the grout outlet of grouting pipe rise to unidirectional funnel (10) below of connector (7) through hole (9) upper end of a height, again in the tube wall of junction to a last height, outer slip casting, take out grouting pipe and slip casting again, in the tube wall of the junction of the PHC pile tube (8) of the highest one deck in position, outer slip casting is finished.
8. the job practices of the junction of PHC pile tube according to claim 7, it is characterized in that: in the tube wall described in the step (9) the junction of the PHC pile tube (8) of each layer, outer slip casting is meant, slurries are under the effect of unidirectional funnel (10), earlier the through hole (9) between (7) two unidirectional funnels of connector (10) is filled up, and from the inlet of first passage (12) through first passage (12), second channel (13) is filled the inwall of full PHC pile tube (8) and the slit between connector (7) waist (7.2) outer wall, simultaneously, concrete slurry flows out to the outlet of first passage (12) and two outlets of third channel (23) from the inlet of first passage (12), makes, near the outer weak soil of outer wall two PHC pile tube (8) short slots (6) is squeezed and is opened and form semi-cylindrical concrete (16) down.
9. the job practices of the junction of PHC pile tube according to claim 1, it is characterized in that: the fanning strip (17) that described unidirectional funnel (10) is made by elastomeric material by polylith constitutes, the circular arc limit of every fanning strip (17) is fixed on the same circle of connector (7) through hole (9) inwall, and the straight flange of the straight flange of every fanning strip (17) and adjacent fanning strip (17) leaves the slit under nature.
CN2009101540025A 2009-09-30 2009-09-30 Construction method for connecting part of PHC tubular piles CN101691752B (en)

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CN102168428A (en) * 2011-03-01 2011-08-31 浙江大学宁波理工学院 Engineering pile groups for postposition cross-partition buildings and construction method
CN102182192A (en) * 2011-03-01 2011-09-14 浙江大学宁波理工学院 Rear transverse septum type building foundation pit enclosure structure and construction method
CN102251521A (en) * 2011-04-26 2011-11-23 东南大学 Reinforced prestressed tubular pile and construction method thereof
CN103171051B (en) * 2013-04-18 2016-01-20 大连大金马基础建设有限公司 Anticorrosion quick pile extension makes mould
CN103469797B (en) * 2013-09-03 2015-07-29 中设建工集团有限公司 A kind of PHC pile tube preparation joint grouting behind shaft or drift lining construction technology
CN105544527A (en) * 2015-12-14 2016-05-04 中铁大桥局第七工程有限公司 Steel pipe pile with dismountable type cutting edge
CN105756065B (en) * 2016-04-22 2018-01-19 广州市建筑科学研究院有限公司 A kind of drilling follow pipe pile side is segmented high-pressure slip-casting system and method
CN106013089A (en) * 2016-06-24 2016-10-12 张继红 High-fault-tolerance and recoverable steel pile cup joint method
CN109049322A (en) * 2018-09-12 2018-12-21 浙江南洋水泥制品有限公司 A kind of concrete prefabricated pipe mold easy to use

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