CN103758120A - Pre-tensioning-mode centrifugal concrete pile with steel strands and manufacturing method - Google Patents
Pre-tensioning-mode centrifugal concrete pile with steel strands and manufacturing method Download PDFInfo
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- CN103758120A CN103758120A CN201410036904.XA CN201410036904A CN103758120A CN 103758120 A CN103758120 A CN 103758120A CN 201410036904 A CN201410036904 A CN 201410036904A CN 103758120 A CN103758120 A CN 103758120A
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Abstract
The invention relates to a pre-tensioning-mode centrifugal concrete pile with steel strands. The pre-tensioning-mode centrifugal concrete pile comprises a concrete pile body and a steel reinforcement cage. The steel reinforcement cage comprises prestress main reinforcements and stirrups. The pre-tensioning-mode centrifugal concrete pile is characterized in that the prestress main reinforcements are the steel strands, the steel strands of at least one end of the steel reinforcement cage are tightly combined with anchor rings; each anchor ring is provided with a stepped through hole, the large hole portion of the stepped through hole is a threaded hole, and the small hole portion of the stepped through hole is a taper hole; a plurality of clamping pieces are placed in the taper holes, the inner surface of each clamping piece is provided with clamping teeth, and multiple clamping pieces are spliced to form a chuck assembly; the outer circumferential surface of each chuck assembly is provided with a cone surface matched with the taper holes; an inner tooth hole is formed in the center of each chuck assembly, and the steel strands penetrate through the inner tooth holes of the corresponding chuck assemblies and are locked by the inner tooth holes. In the process of manufacturing the concrete pile body, the anchor rings combined with the ends of the steel strands and a tension plate are fixed together in a threaded connection mode, and consequently the steel strands which are used as the main reinforcements in the steel reinforcement cage can be tensioned and applied, and end plates can be freely installed according to actual requirements. The invention further relates to a manufacturing method of the pre-tensioning-mode centrifugal concrete pile with the steel strands.
Description
Technical field
The invention belongs to the technical field of the pile foundation engineering of all kinds of architectural structure systems, relate in particular to a kind of pre-tensioning system centrifugal concrete pile and relative manufacturing process with steel strand.
Background technology
All kinds of building structure generally all relates to pile foundation engineering, on existing market, apply to the product that pile foundation comparison between projects is many and have bored pile, prestressed centrifugally concrete tubular pile (comprising pile tube, square pile), but under the current level of economic development and Building technology condition, architectural design field has entered new developing stage, the requirement of pile foundation is also being improved constantly, the technical performance of existing product cannot meet the needs of fast-developing construction market, and highlights many serious technological deficiencies.
The development of prestressed centrifugally concrete pile, production start from the sixties in last century, during beginning, the main muscle of centrifugal concrete pile prestressing force mainly adopts high tensile steel wire, but high tensile steel wire is because diameter is little and circumference is light face, the defect of existence and grip of concrete deficiency, all technical cannot meet building needs.To the eighties in last century, prestressed centrifugally concrete pile starts to adopt steel bar for prestressed concrete as main muscle, because it is prefabrication, production efficiency is high, main rigidity of soft tissues degree is relatively high, the advantages such as concrete strength is high, it is convenient to construct, the cycle is very fast and be building field a large amount of, extensively adopt and continuity is always used so far dominate in conventional piles Foundation Design at present.But in production and application process, main muscle adopts the centrifugal concrete pile of rod iron to have more problem, and as larger in rod iron fragility, its tensile strength is low, and (its tensile strength design load is 1000MPa, tensile strength peak is 1420MPa), cannot meet current Building technology requirement; In production for the ease of stretching, must adopt the technology of rod iron heading, the hot upsetting of rod iron is gone out to a mushroom head, so that this heading and pile body end plate, stretch board are blocked and carry out prestressed stretch-draw, but can to cause the intensity at pier nose position to be undermined material impaired due to the heading of hot this rod iron of upsetting; , because rod iron pier nose precision is inconsistent, during stretch-draw, cannot fully contact with end plate meanwhile, cause end plate local failure; Rod iron, because cutting accuracy is controlled not, causes rod iron length to differ, and there will be Stress non-homogeneity, the phenomenon of even breaking in stretching process; In addition, reinforcing cage is welding fabrication, and rod iron causes Material damage because high temperature freezes.Above-mentioned many disadvantages, causes existing main muscle to adopt the technical performances such as the bending resistance of the centrifugal concrete pile of steel bar for prestressed concrete, shearing resistance obviously not enough.In engineering application, because earthquake, typhoon and other uncertain factors can cause top, buildings pile basis, produce larger moment of flexure and horizontal force, road and bridge or railway bridge also can produce because of the dynamic load of haulage vehicle larger moment of flexure and horizontal force.When above-mentioned traditional centrifugal concrete pile is used for above-mentioned engineering, often because bending resistance and shear behavior are not enough, cannot use, what in highrise building, show is especially serious.In addition,, in the engineerings such as bracing of foundation pit, slope retaining, common centrifugal concrete pile is same because bending resistance and shear behavior deficiency cannot scale application.For security consideration, a lot of recent years of China have started to forbid to use centrifugal concrete pile in some pile foundation engineering.In addition, the prestressed centrifugally concrete pile of existing explained hereafter, must there be end plate at pile body two ends and be fixedly connected as a single entity with pile body, can not be separated, and end plate is mainly the effect of playing pile extension, in construction in the situation that two of needs or above pile body pile extension, the lower surface of beneath pile body and topmost the end plate of the upper surface of pile body because need just obviously belong to unnecessary parts without pile extension; Do not needing in the single pile body piling situation of pile extension, the end plate at the two ends of pile body is also unnecessary substantially.So, in construction, two end plates can be wasted in each position, and the cost of every end plate is wanted 100 yuans of left and right, in architecture construction, often needing to use a large amount of centrifugal concrete piles, the cost of its waste or increase is exactly a huge numeral.
Bored pile is widely used in the pile body in building pile foundation Foundation Design field as another kind, its making is that cast in situs completes, its production process is first in building site, to drill through a stake hole, then reinforcing cage is put into a hole, to concrete perfusion in hole, rear natural curing to be formed can be used after reaching for a long time some strength again.This pile body has stronger vitality because it has high bearing capacity and can adapt to complicated geological, but the mud that this castinplace pile is taken out outside man-hour requirement processing is executed in making, and environment pollution is quite serious, less employing in external urban construction; Easy hole wall collapse, broken pile interlayer in bored pile piling process, as solution cavity or cavity, more will cause a large amount of concrete wastes in addition; And its construction costs is higher, larger on building costs impact; Because it is that cast in situs completes and needs long-time natural curing, can not realize batch production and produce, thereby efficiency is low, long in time limit.
Because the tensile strength of steel strand is high, (its tensile strength design load is 1320MPa, tensile strength reaches as high as 1960MPa), in recent years, China enterprise and scientific research institution are also applied to centrifugal concrete pile to steel strand and have carried out large quantity research, but do not have so far the technical scheme of practical value.A kind of reinforcing cage the pipe pile reinforcing bar cage > > that is furnished with steel strand as a patent No. be ZL201220538453.6 (notification number is CN202865836U) mono-kind of Chinese utility model patent < < has disclosed, its steel strand and prestressed steel bar are used in conjunction with, because rod iron and steel strand exist tensile strength poor, while applying integrated prestress at the same time, can only control stretch-draw with the low tensile strength of rod iron, the high-tensile performance performance of steel strand is not out, therefore in this patent, steel strand are equal to rod iron role, and the due high-tensile performance of unrealized steel strand, as using the tensile strength of steel strand as control criterion, at the same time during integral tension, rod iron will be broken destruction.In addition, how concrete this patent do not disclose in pre-tensioning system centrifugal concrete pile connection, fixing, tension steel strand, so this patented technology does not substantially have real practical value and operability in pile foundation engineering.
And for example an application number is that the Chinese invention patent application < < pre-tensioning system steel strand prestress concrete tubular pile > > of CN200510050212.1 (notification number is CN1687534A) has disclosed a kind of like this concrete tubular pile with steel strand, the main muscle of its prestressing force adopts steel strand, on end plate, have stretchable holes, steel strand are made ground tackle through stretchable holes.But how this patent application does not disclose being connected and anchoring and concrete production method thereof of specific implementation steel strand and end plate, and for the field of those of ordinary skill manufacture to(for) pre-tensioning system centrifugal concrete pile, because professional span is large, generally also has no way of finding out about it and how steel strand are applied in the production of pre-tensioning system centrifugal concrete pile; In addition, according to the accompanying drawing of the technical scheme of its description and this patent application, show, pile body end face after its moulding has outstanding ground tackle, pile extension can not be realized, this outstanding ground tackle is easily broken in construction piling process, thereby pile body prestressing force is destroyed and the technical performances such as its bending resistance, shearing resistance that detract.So, by the technical scheme of its disclosure, cannot produce, even if produced also and cannot be practically applicable to pile foundation engineering at all, this patent has only proposed steel strand to apply to the recapitulative technical though of pre-tensioning system centrifugal concrete pile theoretically, but cannot be applied in reality production and construction.
As seen from the above, a large amount of main muscle that use are rod iron in the market prestressed centrifugally concrete pile and bored pile all can not meet the needs of current pile foundation engineering, and adopt steel strand, as the pre-tensioning system centrifugal concrete pile of main muscle, be only also a kind of technical though at present, because steel strand system is by many stranded the forming of steel wire, be difficult for welding, be difficult for being wound around, itself be difficult for realization and end plate or stretch board, the firm of anchor plate fixed, therefore how steel strand are connected in pre-tensioning system centrifugal concrete pile, fixedly to realize the key of manufacturing the pre-tensioning system centrifugal concrete pile with steel strand, but even to this day, there is no the appearance with the centrifugal concrete pile that main muscle that building practical is worth is steel strand both at home and abroad.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, overcome the be connected and fixed problem of steel strand in pre-tensioning system centrifugal concrete pile, make the main muscle of centrifugal concrete pile inside adopt steel strand to become and may and there is application value realistic, significantly improve the technical performance such as bending resistance, shearing resistance, tension of centrifugal concrete pile, and end plate can be installed according to actual needs.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of pre-tensioning system centrifugal concrete pile with steel strand, the concrete pile body that comprises hollow, be positioned at the reinforcing cage of concrete pile body, reinforcing cage comprises the main muscle of axial arranged prestressing force and the stirrup outside described main muscle around the home, it is characterized in that: the main muscle of described prestressing force is steel strand, the described reinforcing cage at least steel strand of one end is tightly combined with anchor ring, described anchor ring has ladder hole, the macropore portion of ladder hole is screwed hole, the aperture portion of ladder hole is the bellmouth that aperture expands gradually from the inside to the outside, in bellmouth, be placed with multi-disc intermediate plate, the inner surface of each intermediate plate is provided with latch, this multi-disc intermediate plate amalgamation forms the chuck component in order to clip steel strand, the outer peripheral face of this chuck component forms the cone face matching with described bellmouth, in chuck component, be formed centrally internal tooth hole, described each steel strand are all through the interior perforation in corresponding chuck component and locked by interior perforation.
The steel strand at above-mentioned reinforcing cage two ends are tightly combined with described anchor ring by chuck component, and the two ends of steel strand all can be connected and realize stretch-draw with stretch board, anchor plate by anchor ring like this, certainly, also can be steel strand and anchor ring knot merga pass anchor ring and the stretch board of only reinforcing cage one end, anchor plate connects realizes stretch-draw, the steel strand of the other end are not combined with anchor ring, in production, the steel strand of this other end can adopt alternate manner to connect, fixing to realize production, for example: in production the mould of this other end arrange outward two parallel, between be separated with certain space, there is perforation, and be the steel plate that a braced structures is welded and fixed, wherein a block plate props up mould and is fastened with the outer face of mould, play the effect of gripper shoe, the outer end of another block plate is provided with strand tapered anchorage, strand tapered anchorage is conventional components, steel strand are through stuck fixing by strand tapered anchorage after two block plates, thereby complete steel strand fixing of this other end, after concrete pile body completes, cut off the steel strand between this two block plate.
As preferably, the outer end of above-mentioned anchor ring flushes with the outer face of described concrete pile body or is lower slightly.Even like this in the situation that end plate not being installed, anchor ring does not expose outside pile body end face yet, do not affect piling, if end plate is installed, even if the outer face of anchor ring slightly exposes outside pile body end face, as long as cavity is set on our end face that contacts with pile body at end plate, in order to hold, to expose the anchor ring of pile body end face also feasible.
The periphery of the above-mentioned chuck component being comprised of multi-disc intermediate plate is provided with cannelure, in this cannelure, is placed with the cranse in multi-disc intermediate plate hoop jail.Cranse can be wire loop or rubber ring, cranse is set and can makes the chuck component of multi-disc intermediate plate composition more firm.
Above-mentioned each chuck component is comprised of three described intermediate plates.Through evidence, it is better that each chuck component forms its indices by three intermediate plates, and the location of steel strand and bellmouth is the most firm.
The outer peripheral face of above-mentioned anchor ring the inner is provided with one or more jacks that insert for instrument.Jack is set and facilitates anchor ring to be connected with stretch board or anchor plate, during connection, insertion tool in jack, instrument can be reinforcing bar or other hand-held tool, and the instrument of holding with a firm grip, prevents from being threaded connection part and in rotation process, drives anchor ring rotation.
The end face of above-mentioned concrete pile body is provided with end plate, near on the end plate of anchor ring, have the connection counterbore that number is identical with steel strand radical, connect counterbore and steel strand corresponding setting one by one, each connects and in counterbore, is equipped with a threaded connector, this threaded connector has head and bar portion, wherein head is sunken in the macropore portion that connects counterbore, and the bar portion of described threaded connector is provided with external screw thread, after the aperture portion of bar portion through connection counterbore, is threaded with described screwed hole.This threaded connector is actual is bolt.It is to be provided with the concrete pile body end plates of end plate and the connected mode of pile body, and wherein threaded connector is sunken in the macropore portion that connects counterbore, guarantees that threaded connector does not expose outside end plate, can not affect concrete pile and carry out pile extension by end plate.
The head of above-mentioned threaded connector is regular hexagon head.Convenient employing as Wrench rotation threaded connector.
Second technical problem to be solved by this invention is to provide a kind of manufacture and as described in aforementioned claim, has the manufacture method of the pre-tensioning system centrifugal concrete pile of steel strand, it is characterized in that: manufacture method comprises following steps
(1), the customized cut-off of steel strand;
(2), make reinforcing cage, at least one end of steel strand is tightly combined with anchor ring by chuck component;
(3), the anchor ring of reinforcing cage one end being threaded connection to part and stretch board or anchor plate is fixed together, the steel strand of the other end of reinforcing cage and anchor plate or stretch board are fixed together, reinforcing cage by this with stretch board is placed in female die, stretch board is arranged in the die cavity of female die, the outer face laminating of anchor plate and female die;
(4), to female die feeding, upper mold section closes;
(5), stretch-draw, at one end by pulling stretch board to carry out integral tension to reinforcing cage, by Method of Steel Strand Stretching to regulation numerical value;
(6), centrifugal forming;
(7), stream curing;
(8), form removal remove stretch board and anchor plate, complete pile body and make;
(9), according to construction, need to threaded connector, fixed charge method end plate be installed in the one or both ends of pile body, also can need to not be used in end plate is installed on pile body according to construction.
This manufacture method makes the possibility that creates of aforementioned pre-tensioning system centrifugal concrete pile, in the method, between each step, can form good connecting, and manufacturing process is simple and smooth, low cost of manufacture.
In above-mentioned steps 2, the two ends of steel strand are all tightly combined with anchor ring by chuck component; In described step 3, the anchor ring of reinforcing cage one end is threaded connection part and stretch board is fixed together, and the anchor ring of the other end of reinforcing cage is threaded connection part and anchor plate is fixed together.
Stretch-draw in above-mentioned steps 5 need to be used gripper shoe, screw rod and locking nut, described gripper shoe and the laminating of mould opposite side end face, described stretch board is connected with screw rod, the threaded shank of described screw rod is through the perforation in gripper shoe, described locking nut is threaded in screw flight bar portion, pull again screw rod and then pull stretch board and steel strand, Method of Steel Strand Stretching is locked with locking nut after the numerical value of regulation.
Stretch board can adopt following structure to be connected with screw rod, on above-mentioned stretch board, have counterbore, the threaded shank of described screw rod is inner through passing the perforation in gripper shoe after the counterbore stretch board from reinforcing cage again, and the head of described screw rod is sunken in the macropore portion of the counterbore on stretch board.Bolt head is sunken in the counterbore of stretch board, is for increasing concrete feeding space, makes pile crown after moulding, be unlikely to produce the problem that lacks material.
Compared with prior art, the invention has the advantages that: main muscle all adopts steel strand, make the tensile strength of winner's muscle consistent, pile body overall performance increases, the reinforcing cage at least steel strand of one end is tightly combined with anchor ring by chuck component, it is firm that anchor ring is connected with steel strand, anchor ring is when doing pulling experiment, more pull anchor ring, it is more firm that steel strand are combined with anchor ring, even if steel strand are broken, anchor ring can slippage yet, the macropore portion of anchor ring ladder hole is screwed hole in addition, therefore can will be fixed on anchor ring and the stretch board of steel strand end in concrete pile manufacturing process, anchor plate is threaded connection part and is threaded and is fixed together, connected mode is identical with end plate, then at one end by the stretch-draw to stretch board, realization is carried out stretch-draw to the steel strand as main muscle in reinforcing cage, in stretching process, steel strand can drive chuck component towards the small-bore direction retraction of bellmouth, chuck component and bellmouth firmly to be fixed, and make the further banding of interior perforation at chuck component center stuck steel strand, then carry out centrifugal forming, after completing, moulding unloads stretch board, anchor plate, on pile body, retain and have the anchor ring fixing with concrete pile body, can be as required at the end-face helical connection end plate of pile body, with threaded connector, the anchor ring of retaining on end plate and pile body is connected and fixed, complete the manufacture process of the centrifugal concrete pile with steel strand, the centrifugal concrete pile that manufacture completes does not protrude the ground tackle portion of end plate, do not affect pile extension and piling, it is a kind of practicable centrifugal concrete pile with steel strand, and the connection of steel strand in this centrifugal concrete pile, locking mode advantages of simple, easy to operate and cost is low, make steel strand apply to the real value that centrifugal concrete pile was achieved and had industrial applicability, centrifugal concrete pile of the present invention, because having adopted the high steel strand of performance, improves its bending resistance, shearing resistance, tensile property greatly, and, owing to being threaded connection between concrete pile end plate and pile body, part is dismountable to be connected, the quantity whether pile body two ends install end plate and installation end plate can freely arrange according to the actual needs of pile extension completely, can save so a considerable end plate expense, effectively reduce the holistic cost that building is manufactured.
Accompanying drawing explanation
Fig. 1 is the structural representation that the embodiment of the present invention is unkitted end plate;
Fig. 2 is the A place enlarged drawing of Fig. 1;
Fig. 3 is the lateral view that the embodiment of the present invention is unkitted end plate;
Fig. 4 is that the embodiment of the present invention is equipped with the structural representation after end plate;
Fig. 5 is the B place enlarged drawing of Fig. 4;
Fig. 6 is that the embodiment of the present invention is equipped with the lateral view after end plate;
Fig. 7 is that the C-C of Fig. 4 is to sectional view;
Fig. 8 is the perspective view of chuck component in the embodiment of the present invention;
Fig. 9 is the three-dimensional exploded view of chuck component in the embodiment of the present invention;
Figure 10 be in the embodiment of the present invention anchor ring partly cut open figure;
Figure 11 is for manufacturing the schematic diagram (removing upper mold section) of the manufacture method of aforementioned pre-tensioning system centrifugal concrete pile;
Figure 12 is for manufacturing the perspective view of aforementioned pre-tensioning system centrifugal concrete pile mould therefor.
The specific embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
As shown in Fig. 1～10, be the preferred embodiments of the present invention.
A kind of pre-tensioning system centrifugal concrete pile with steel strand, comprise concrete pile body 1, the end plate 2 of hollow and be positioned at the reinforcing cage of concrete pile body 1, concrete pile body 1 can be circular stake, also can be barrette, polygonal pile and various pretensioned prestressing centrifugal concrete shaped pile, and end plate 2 has on two end faces that are connected to concrete pile body 1 two ends.Reinforcing cage comprises the main muscle of axial arranged prestressing force and the stirrup outside main muscle 4 around the home, the main muscle of prestressing force is steel strand 3, fixing between stirrup 4 and steel strand 3 can adopt manual colligation, also can adopt automatic binding machine colligation or other mechanical systems to fix, concrete pile body 1 can also axial arrangedly have nonprestressed reinforcement, anchor rib and pile protection hoop, its conventional design that is centrifugal concrete pile.
In the present embodiment, two of steel strand 3 ends are all tightly combined with anchor ring 5 by following chuck component 7, and the outer end of anchor ring 5 flushes with the outer face of described concrete pile body 1 or be lower slightly to avoid anchor ring 5 to protrude from the outer face of concrete pile body 1.Anchor ring 5 has ladder hole, the macropore portion of ladder hole is screwed hole 51, the aperture portion of ladder hole is the bellmouth 52 that aperture expands gradually from the inside to the outside, in bellmouth 52, be placed with multi-disc intermediate plate 6, the inner surface of each intermediate plate 6 is provided with latch 61, these multi-disc intermediate plate 6 amalgamations form the chuck component 7 in order to clip steel strand 3, the outer peripheral face of this chuck component 7 forms the cone face 71 matching with described bellmouth 52, in chuck component 7, be formed centrally internal tooth hole 72, each steel strand 3 are all through the interior perforation 72 in corresponding chuck component and by interior perforation 72 lockings.
Each chuck component 7 of the present embodiment is comprised of three described intermediate plates 6.The periphery of chuck component 7 is provided with cannelure 73, is placed with the firm cranse 74 of multi-disc intermediate plate 6 hoop in this cannelure 73, and cranse 74 can be wire loop or rubber ring.
The outer peripheral face of anchor ring 5 the inners is provided with a plurality of jacks 53 that insert for instrument.Jack 53 is set and facilitates anchor ring to be connected with stretch board or anchor plate, during connection, insertion tool in jack, instrument can be reinforcing bar or other hand-held tool, and the instrument of holding with a firm grip, prevents from being threaded connection part and in rotation process, drives anchor ring rotation.
The end face of concrete pile body 1 is provided with end plate 2, near on the end plate 2 of anchor ring 5, have the connection counterbore 21 that number is identical with steel strand radical, connect counterbore 21 and steel strand 3 corresponding setting one by one, each connects and in counterbore 21, is equipped with a threaded connector 8, this threaded connector 8 has head 81 and bar portion 82, wherein head 81 is sunken in the macropore portion that connects counterbore 21, and the bar portion 82 of threaded connector 8 is provided with external screw thread, after the aperture portion of bar portion 82 through connection counterbore 21, is threaded with screwed hole 51.
Owing to being threaded connection between concrete pile end plate and pile body, part 8 is dismountable to be connected, and during construction is used, while not needing pile extension if a pile only need be made a call in each position, in producing, can not need to install end plate at the two ends of concrete pile body; If need to be with the above concrete pile pile extensions of two or two, the lower surface of beneath pile body and topmost the upper surface of pile body can not need to install end plate, all the other pile body end faces should be installed end plate.
The body of rod that the centrifugal concrete pile that the present invention mentions can be used as electric pole uses, and the ground upper support bar also can be used as in telecomm base station, wind generator system is used, and also can be used as the supporter of other ground surface works, and utilization scope is extremely wide.
As shown in Figure 11,12, a kind of manufacture has the manufacture method of the pre-tensioning system centrifugal concrete pile of steel strand as described in aforementioned claim, and this preparation method be take the two ends of steel strand 3 and is all combined with anchor ring 5 as example, comprises following steps
(1), the customized cut-off of steel strand 3;
(2), make reinforcing cage, the two ends of steel strand 3 are all tightly combined with anchor ring 5 by chuck component 7;
(3), the anchor ring of reinforcing cage one end 5 being threaded connection to part 8 is fixed together with stretch board 10, the other end anchor ring 5 of reinforcing cage is threaded connection part 8 and is fixed together with anchor plate 11, reinforcing cage by this with stretch board 10 is placed in female die 9a, stretch board is arranged in the die cavity of female die 9a, and anchor plate 11 is fitted with the outer face of female die 9a;
The mode that threaded connector 8 is connected with stretch board 10 or anchor plate 11 can be with reference to the connected mode of previous embodiment end plates 2 and pile body.
The bar portion 82 of Figure 10 threaded connector 8 is provided with external screw thread, after the counterbore that bar portion 82 is passed on stretch board 10 or anchor plate, is threaded with the screwed hole 51 on anchor ring 5.
(4), to female die 9a feeding, upper mold section 9b closes;
(5), stretch-draw, at one end, by pulling 10 pairs of reinforcing cages of stretch board to carry out integral tension, steel strand 3 are stretched to the numerical value of regulation; In stretching process, steel strand 3 can drive chuck component 7 towards the small-bore direction retraction of bellmouth 52, chuck component 7 and bellmouth 52 firmly to be fixed, and make the further banding of interior perforation 72 the stuck steel strand at chuck component 7 centers;
(6), centrifugal forming;
(7), stream curing;
(8), form removal, remove the threaded connector 8 on stretch board 10 and anchor plate 11, complete the making of pile body;
(9), according to construction, need to threaded connector 8, fixed charge method end plates 2 be installed in the one or both ends of pile body, also can need to not be used in end plate is installed on pile body according to construction.
Stretch-draw in step 5 need to be used gripper shoe 14, screw rod 12 and locking nut 13, gripper shoe 14 and the laminating of mould opposite side end face, on stretch board 10, have counterbore 101, the threaded shank of screw rod 12 is inner through passing the perforation in gripper shoe 14 after the counterbore 101 stretch board from reinforcing cage again, the head of screw rod 12 is sunken in the macropore portion of the counterbore 101 on stretch board 10, locking nut 13 is threaded on the thread rod part of screw rod 12, adopt again machinery to pull screw rod 12 and then pull stretch board 10 and steel strand 3, steel strand 3 are stretched to after the numerical value of regulation with locking nut 13 lockings.
Claims (12)
1. a pre-tensioning system centrifugal concrete pile with steel strand, the concrete pile body (1) that comprises hollow, be positioned at the reinforcing cage of concrete pile body (1), reinforcing cage comprises the main muscle of axial arranged prestressing force and the stirrup (4) outside described main muscle around the home, it is characterized in that: the main muscle of described prestressing force is steel strand (3), the described reinforcing cage at least steel strand of one end (3) is tightly combined with anchor ring (5), described anchor ring (5) has ladder hole, the macropore portion of ladder hole is screwed hole (51), the aperture portion of ladder hole is the bellmouth (52) that aperture expands gradually from the inside to the outside, in bellmouth (52), be placed with multi-disc intermediate plate (6), the inner surface of each intermediate plate (6) is provided with latch (61), this multi-disc intermediate plate (6) amalgamation forms the chuck component (7) in order to clip steel strand (3), the outer peripheral face of this chuck component (7) forms the cone face (71) matching with described bellmouth (52), in chuck component (7), be formed centrally internal tooth hole (72), described each steel strand (3) are all locked through the interior perforation (72) in corresponding chuck component and by interior perforation (72).
2. the pre-tensioning system centrifugal concrete pile with steel strand according to claim 1, is characterized in that: the steel strand (3) at described reinforcing cage two ends are tightly combined with described anchor ring (5) by chuck component (7).
3. the pre-tensioning system centrifugal concrete pile with steel strand according to claim 1, is characterized in that: the outer end of described anchor ring (5) flushes with the outer face of described concrete pile body (1) or be lower slightly.
4. the pre-tensioning system centrifugal concrete pile with steel strand according to claim 1, it is characterized in that: the periphery of the described chuck component (7) being comprised of multi-disc intermediate plate (6) is provided with cannelure (73), in this cannelure (73), is placed with multi-disc intermediate plate (6) is bound round to firm cranse (74).
5. the pre-tensioning system centrifugal concrete pile with steel strand according to claim 1, is characterized in that: described each chuck component (7) is comprised of three described intermediate plates (6).
6. the pre-tensioning system centrifugal concrete pile with steel strand according to claim 1, is characterized in that: the inner outer peripheral face of described anchor ring (5) is provided with the jack (53) inserting for instrument.
7. according to the arbitrary described pre-tensioning system centrifugal concrete pile with steel strand of claim 1～6, it is characterized in that: the end face of described concrete pile body (1) is provided with end plate (2), near on the end plate (2) of anchor ring (5), have the connection counterbore (21) that number is identical with steel strand (3) radical, connect counterbore (21) and steel strand (3) corresponding setting one by one, each connects and in counterbore (21), is equipped with a threaded connector (8), this threaded connector (8) has head (81) and bar portion (82), wherein head (81) is sunken in the macropore portion that connects counterbore (21), the bar portion (82) of described threaded connector (8) is provided with external screw thread, after the aperture portion of bar portion (82) through connection counterbore (21), be threaded with described screwed hole (51).
8. the pre-tensioning system centrifugal concrete pile with steel strand according to claim 7, is characterized in that: the head (81) of described threaded connector (8) is regular hexagon head.
9. manufacture has a manufacture method for the pre-tensioning system centrifugal concrete pile of steel strand as described in aforementioned arbitrary claim, it is characterized in that: described manufacture method comprises following steps
(1), the customized cut-off of steel strand (3);
(2), make reinforcing cage, at least one end of steel strand (3) is tightly combined with anchor ring (5) by chuck component (7);
(3), the anchor ring of reinforcing cage one end (5) being threaded connection to part (8) is fixed together with stretch board (10) or anchor plate (11), the other end steel strand (3) of reinforcing cage are fixed together with anchor plate (11) or stretch board (10), the reinforcing cage being somebody's turn to do with stretch board (10) is placed in to female die (9a), stretch board is arranged in the die cavity of female die (9a), and anchor plate (11) is fitted with the outer face of female die (9a);
(4), to female die (9a) feeding, the upper mold section that closes (9b);
(5), stretch-draw, at one end, by pulling stretch board (10) to carry out integral tension to reinforcing cage, steel strand (3) are stretched to the numerical value of regulation;
(6), centrifugal forming;
(7), stream curing;
(8), form removal remove stretch board (9) and anchor plate (10), complete the making of pile body;
(9), according to construction, need to fixed charge method end plate (2) be installed at threaded connector one or both ends for (8) of pile body, also can need to not be used according to constructing end plate is installed on pile body.
10. preparation method according to claim 9, is characterized in that: the two ends of steel strand in described step 2 (3) are all tightly combined with anchor ring (5) by chuck component (7); In described step 3, the anchor ring of reinforcing cage one end (5) is threaded connection part (8) and stretch board (10) and is fixed together, and the anchor ring of the other end of reinforcing cage (5) is threaded connection part (8) and is fixed together with anchor plate (10).
11. preparation methods according to claim 9, it is characterized in that: the stretch-draw in described step 5 need to be used gripper shoe (14), screw rod (12) and locking nut (13), described gripper shoe (14) and the laminating of mould opposite side end face, described stretch board (9) is connected with screw rod (12), the threaded shank of described screw rod (12) is through the perforation in gripper shoe (14), described locking nut (13) is threaded on the thread rod part of screw rod (12), pull again screw rod (12) and then pull stretch board (9) and steel strand (3), steel strand (3) are stretched to after the numerical value of regulation with locking nut (13) locking.
12. preparation methods according to claim 11, it is characterized in that: on described stretch board (9), have counterbore (101), the threaded shank of described screw rod (12) is inner through passing the perforation in gripper shoe (14) after the counterbore (101) stretch board from reinforcing cage again, and the head of described screw rod (12) is sunken in the macropore portion of the counterbore (101) on stretch board.
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Cited By (1)
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|---|---|---|---|---|
| CN111958809A (en) * | 2020-08-20 | 2020-11-20 | 凡天建筑科技有限公司 | Method for manufacturing precast pile rod |
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