CN103741673A - Self-anchored steel strand pretensioned centrifugal concrete pile and manufacturing method thereof - Google Patents
Self-anchored steel strand pretensioned centrifugal concrete pile and manufacturing method thereof Download PDFInfo
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- CN103741673A CN103741673A CN201410034909.9A CN201410034909A CN103741673A CN 103741673 A CN103741673 A CN 103741673A CN 201410034909 A CN201410034909 A CN 201410034909A CN 103741673 A CN103741673 A CN 103741673A
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Abstract
The invention relates to a self-anchored steel strand pretensioned centrifugal concrete pile. The self-anchored steel strand Pretensioned centrifugal concrete pile comprises a hollow concrete pile body and a steel reinforcement cage located in the concrete pile body, wherein the steel reinforcement cage comprises prestressed main reinforcements arranged in the axial direction, stirrups and end plates. The self-anchored steel strand Pretensioned centrifugal concrete pile is characterized in that the prestressed main reinforcements are steel strands, a plurality of through holes allowing the steel strands to pass through are formed on each end plate, the through holes correspond to the steel strands one to one so that the steel strands passing through the through holes of the end plates can be connected with an external steel strand locking structure, and a plurality of threaded connecting holes for connection with the steel strand locking structure are further formed on the end plates. In this way, the steel strands can be tensioned through the steel strand locking structure outside, and then centrifugal molding is carried out, after molding is finished, an anchor plate is unloaded, and finally, the steel strands exposed out of the end plates are cut off and ground; the finished centrifugal concrete pile has no anchor part projecting from the end plate, and the centrifugal concrete pile with the steel strands is practicable and feasible.
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 self-anchoring type steel strand pre-tensioning system centrifugal concrete pile.
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 yet, 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, fixing and how steel strand being carried out to stretch-draw is to realize the key of manufacturing the pre-tensioning system centrifugal concrete pile with steel strand, 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 not enough for above-mentioned prior art, overcome the be connected and fixed problem of steel strand in pre-tensioning system centrifugal concrete pile, make the main muscle of pre-tensioning system 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
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of self-anchoring type steel strand pre-tensioning system centrifugal concrete pile, comprise hollow concrete pile body, be positioned at the reinforcing cage of concrete pile body; Reinforcing cage comprises the main muscle of axial arranged prestressing force, the stirrup outside described main muscle and at least one end plate that is positioned at concrete pile end of body around the home; At least one end cover of described concrete pile body has pile protection hoop, pile protection hoop to be fixedly connected with end plate or be one-body molded is steel drum structure; On pile protection hoop or end plate, be fixedly connected with anchor rib; It is characterized in that: the main muscle of described prestressing force is steel strand, on an at least described end plate, have a plurality of perforation of passing for steel strand, perforation is one-to-one relationship with steel strand, make can be connected with extraneous steel strand locking mechanism through the steel strand of the perforation of end plate, on described end plate, also have a plurality of threaded connection holes in order to be connected with steel strand locking mechanism.
Above-mentioned end plate has two, all has described perforation on every end plate.
The thickness of above-mentioned pile protection hoop is 3mm～15mm.Make the bending resistance shear behavior of concrete pile end of body reach the mechanical property in Fei Zimao district.
Second technical problem to be solved by this invention is to provide the manufacture method of a kind of manufacture self-anchoring type steel strand pre-tensioning system centrifugal concrete pile as described in aforementioned claim, it is characterized in that: described manufacture method comprises following steps
(1), the customized cut-off of steel strand, make reinforcing cage;
(2), pile protection hoop is fixedly connected with end plate or one-body molded for steel drum structure, on pile protection hoop or end plate, be fixedly connected with anchor rib;
(3), in the outer face of end plate, be fixedly connected with steel strand locking mechanism, and allow on reinforcing cage every steel strand through the bellmouth being positioned on the stretch board of perforation on end plate and steel strand locking mechanism;
(4), the reinforcing cage in step 3 is placed in female die 13a, the anchor plate of steel strand locking mechanism and the outer face of female die at reinforcing cage two ends are fastened, thus fixing whole reinforcing cage;
(5), to female die feeding, upper mold section closes;
(6), tension steel strand: with the stretch-draw respectively of every steel strand of punching jack pair, be stretched to specified value and make chuck component locking steel strand;
(7), centrifugal forming;
(8), stream curing;
(9), form removal, cut off steel strand between anchor plate, stretch board and put, remove being connected of anchor plate and end plate;
(10), the steel strand that expose outside end plate are cut off and polished, make steel strand not expose outside the outer face of end plate.
This manufacture method is difference stretching type, makes the possibility that creates of aforementioned self-anchoring type steel strand pre-tensioning system centrifugal concrete pile, can form good connecting in the method between each step, and manufacturing process is simple and smooth, low cost of manufacture.
Steel strand locking mechanism in above-mentioned steps 3 comprises anchor plate, stretch board and be supported on anchor plate and stretch board between braced structures, this braced structures is fixed with anchor plate and stretch board respectively, wherein, anchor plate can be fixedly connected with end plate by bolt, described stretch board is provided with the bellmouth that several apertures from the inside to the outside expand gradually, bellmouth and steel strand corresponding setting one by one, in each 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.
On above-mentioned stretch board, have several counterbores, be placed with the transition member that profile and counterbore match in each counterbore, the front end of transition member has the ring-type shoulder block portion in the macropore portion that is sunken to described counterbore, and described bellmouth is arranged in described transition member.By transition member is set in stretch board, and bellmouth is arranged in transition member, due to the processing of counterbore, to compare bellmouth more convenient, and process bellmouth in transition member, compare and on stretch board, process bellmouth and more easily realize, the material that simultaneously we also can allow transition member adopt properties to be better than end plate is made, and allows steel strand and end plate relative fix more firm.
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 steel ring in multi-disc intermediate plate hoop jail.The chuck component that this structure can make multi-disc intermediate plate form is 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
Above-mentioned braced structures is many connecting rods, and described many connecting rods are arranged between described anchor plate and stretch board in the mode of the equal portion of circumference, and every connecting rod is threaded with described anchor plate and stretch board respectively.
Above-mentioned braced structures is tube connector, and the two ends of this tube connector are welded and fixed with described anchor plate and stretch board respectively.
Stretching mode in above-mentioned steps 6 is, the head of punching jack is withstood to the outer face of intermediate plate assembly, steel strand pass the head of punching jack and are connected with the traction element of punching jack, the traction element pull steel strand of punching jack carry out stretch-draw and are stretched to specified value these root steel strand, make steel strand generation deformation, then unload punching jack, steel strand bounce back under the effect of self deformation retraction force, the retraction of steel strand drives 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 in chuck component stuck steel strand.
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, on each end plate, have a plurality of perforation of passing for steel strand, perforation is one-to-one relationship with steel strand, make like this can be connected with extraneous steel strand locking mechanism through the steel strand of the perforation of end plate, so just, can externally by steel strand locking mechanism, to steel strand, be fixed, stretch-draw, then carry out centrifugal forming, after completing, moulding unloads anchor plate, steel strand are put and opened, last severing exposes outside the steel strand of end plate and polishes, the centrifugal concrete pile that manufacture completes does not protrude the ground tackle portion of end plate, 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, and, can be according to the needs of practice of construction pile extension, an end plate can be respectively set at concrete pile body two ends, also an end plate can be only at one end set, the other end does not need to establish end plate and pile protection hoop, thereby can save the materials such as end plate, in production because all there is steel strand locking mechanism at reinforcing cage two ends in order to fixing steel strand, so having or not of end plate do not affect steel strand being fixedly connected with in centrifugal concrete pile, stretch-draw, 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.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the lateral view of the embodiment of the present invention;
Fig. 3 is for manufacturing the schematic diagram (removing upper mold section) of the manufacture method of aforementioned self-anchoring type steel strand pre-tensioning system centrifugal concrete pile;
Fig. 4 is the A place enlarged drawing of Fig. 3;
Fig. 5 is the lateral view of Fig. 3
Fig. 6 is the perspective view of chuck component in aforementioned manufacture method;
Fig. 7 is the three-dimensional exploded view of chuck component in aforementioned manufacture method;
Fig. 8 is that aforementioned manufacture method is arranged on the structural representation in transition member by bellmouth;
Fig. 9 is that aforementioned manufacture method adopts tube connector as the structural representation of braced structures.
Figure 10 is for manufacturing the perspective view of aforementioned self-anchoring type steel strand 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 Figure 1, 2, be the preferred embodiments of the present invention.
A kind of pre-tensioning system centrifugal concrete pile with steel strand, comprise hollow concrete pile body 1, 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.Reinforcing cage comprises the main muscle of axial arranged prestressing force, the stirrup 4 outside described main muscle and at least one end plate 2 that is positioned at concrete pile body 1 end around the home; 1 two ends of concrete pile body are all overlapped and are had pile protection hoop 13, and pile protection hoop 13 is fixedly connected with end plate 2 or is one-body molded is steel drum structure; On pile protection hoop 13 or end plate 2, be fixedly connected with anchor rib 14.Concrete pile body 1 can also axial arrangedly have nonprestressed reinforcement.The thickness of pile protection hoop 13 is 3mm～15mm.
On each end plate 2, have a plurality of perforation 21 of passing for steel strand, perforation 21 is one-to-one relationship with steel strand 3, make can be connected with extraneous steel strand locking mechanism through the steel strand 3 of the perforation 21 of end plate, on end plate 2, also have a plurality of threaded connection holes 22 in order to be connected with steel strand locking mechanism.
The body of rod that the centrifugal concrete pile with steel strand 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 Fig. 3～10, for a kind of manufacture method of manufacturing aforementioned self-anchoring type steel strand pre-tensioning system centrifugal concrete pile, it is characterized in that: described manufacture method comprises following steps
(1), the customized cut-off of steel strand 3, make reinforcing cage;
(2), pile protection hoop 13 is fixedly connected with end plate 2 or one-body molded for steel drum structure, on pile protection hoop 13 or end plate 2, be fixedly connected with anchor rib 14;
(3), in the outer face of end plate 2, be fixedly connected with the locking mechanism of steel strand, and allow on reinforcing cage every steel strand 3 through being positioned at perforation 21 on end plate and the bellmouth 61 on stretch board 6;
Steel strand locking mechanism comprises anchor plate 5, stretch board 6 and be supported on anchor plate 5 and stretch board 6 between braced structures, this braced structures is fixing with anchor plate 5 and stretch board 6 respectively, wherein, anchor plate 5 is fixedly connected with end plate 2 by bolt 7, stretch board 6 is provided with the bellmouth 61 that several apertures from the inside to the outside expand gradually, bellmouth 61 and steel strand 3 corresponding setting one by one, in each bellmouth 61, be placed with multi-disc intermediate plate 8, the inner surface of each intermediate plate 8 is provided with latch 81, these multi-disc intermediate plate 8 amalgamations form the chuck component 9 in order to clip steel strand 3, the outer peripheral face of this chuck component 9 forms the cone face 91 matching with bellmouth 61, in chuck component 9, be formed centrally internal tooth hole 92, each steel strand 3 are all through the interior perforation 92 in corresponding chuck component.
(4), the reinforcing cage in step 3 is placed in female die 13a, the anchor plate 8 of the steel strand locking mechanism at reinforcing cage two ends is fastened with the outer face of female die 13a, thus fixing whole reinforcing cage;
(5), to female die 13a feeding, upper mold section 13b closes;
(6), tension steel strand 3: with 3 stretch-draw respectively of 14 pairs of every steel strand of punching jack, be stretched to specified value and make chuck component 9 locking steel strand 3, during stretch-draw, the head of punching jack 14 is withstood to the outer face of intermediate plate assembly 6, steel strand 3 pass the head of punching jack 14 and are connected with the traction element of punching jack 14, 3 pairs of these root steel strand 3 of traction element pull steel strand of punching jack 14 carry out stretch-draw and are stretched to specified value, make steel strand 3 that deformation occur, then unload punching jack 14, steel strand 3 bounce back under the effect of self deformation retraction force, the retraction of steel strand 3 drives chuck component 9 towards the small-bore direction retraction of bellmouth 61, chuck component 9 and bellmouth 61 firmly to be fixed, and make the further banding of interior perforation 92 in chuck component stuck steel strand 3.
(7), centrifugal forming;
(8), stream curing;
(9), form removal, cut off steel strand 3 between anchor plate 5, stretch board 6 and put, remove being connected of anchor plate 5 and end plate 2;
(10), the steel strand 3 that expose outside end plate 2 are cut off and polished, make steel strand 3 not expose outside the outer face of end plate 2.
As shown in Figure 3, braced structures can be many connecting rods 11, and many connecting rods 11 are arranged between anchor plate 5 and stretch board 6 in the mode of the equal portion of circumference, and every connecting rod 11 is threaded with described anchor plate 5 and stretch board 6 respectively.
As shown in Figure 5,6, each chuck component 9 is comprised of three described intermediate plates 8.The periphery of the chuck component 9 being comprised of three intermediate plates 8 is provided with cannelure 93, is placed with the firm steel ring 94 of multi-disc intermediate plate 8 hoop in this cannelure 93.
As shown in Figure 7, certainly also can on stretch board 6, have several counterbores 62, in each counterbore 62, be placed with the transition member 10 that profile and counterbore 62 match, the front end of transition member 10 has the ring-type shoulder block portion 101 in the macropore portion that is sunken to described counterbore 62, and bellmouth 61 is arranged in described transition member 10.
As shown in Figure 8, braced structures can also be tube connector 12, and the two ends of this tube connector 12 are welded and fixed with described anchor plate 5 and stretch board 6 respectively.
Claims (10)
1. a self-anchoring type steel strand pre-tensioning system centrifugal concrete pile, comprise hollow concrete pile body (1), be positioned at the reinforcing cage of concrete pile body (1); Reinforcing cage comprises the main muscle of axial arranged prestressing force, the stirrup (4) outside described main muscle and at least one end plate (2) that is positioned at concrete pile body (1) end around the home; At least one end cover of described concrete pile body (1) has pile protection hoop (13), pile protection hoop (13) to be fixedly connected with end plate (2) or be one-body molded is steel drum structure; On pile protection hoop (13) or end plate (2), be fixedly connected with anchor rib (14); It is characterized in that: the main muscle of described prestressing force is steel strand (3), on an at least described end plate (2), have a plurality of perforation (21) of passing for steel strand, perforation (21) is one-to-one relationship with steel strand (3), the steel strand (3) of the perforation (21) through end plate can be connected with extraneous steel strand locking mechanism, on described end plate (2), also have a plurality of threaded connection holes (22) in order to be connected with steel strand locking mechanism.
2. self-anchoring type steel strand pre-tensioning system centrifugal concrete pile according to claim 1, is characterized in that: described end plate (2) has two, all has described perforation (21) on every end plate.
3. self-anchoring type steel strand pre-tensioning system centrifugal concrete pile according to claim 1, is characterized in that: the thickness of described pile protection hoop (13) is 3mm～15mm.
4. a manufacture method for manufacture self-anchoring type steel strand pre-tensioning system centrifugal concrete pile as described in aforementioned claim, is characterized in that: described manufacture method comprises following steps
(1), the customized cut-off of steel strand (3), make reinforcing cage;
(2), pile protection hoop (13) is fixedly connected with end plate (2) or one-body molded for steel drum structure, on pile protection hoop (13) or end plate (2), be fixedly connected with anchor rib (14);
(3), make two locking mechanisms that are fixedly connected with steel strand, the locking mechanism of each steel strand comprises anchor plate (5), stretch board (6) and be supported on anchor plate (5) and stretch board (6) between braced structures, this braced structures is fixing with anchor plate (5) and stretch board (6) respectively, wherein, anchor plate (5) is fixedly connected with end plate (2) by bolt (7), described stretch board (6) is provided with the bellmouth (61) that several apertures from the inside to the outside expand gradually, bellmouth (61) and steel strand (3) corresponding setting one by one, in each bellmouth (61), be placed with multi-disc intermediate plate (8), the inner surface of each intermediate plate (8) is provided with latch (81), this multi-disc intermediate plate (8) amalgamation forms the chuck component (9) in order to clip steel strand (3), the outer peripheral face of this chuck component (9) forms the cone face (91) matching with described bellmouth (61), in chuck component (9), be formed centrally internal tooth hole (92), each steel strand (3) are through passing the interior perforation (92) in corresponding chuck component after anchor plate again.
(4), the reinforcing cage in step 3 is placed in female die (13a), the anchor plate at reinforcing cage two ends (8) is fastened with the outer face of female die (13a), thus fixing whole reinforcing cage;
(5), to female die (13a) feeding, the upper mold section that closes (13b);
(6), tension steel strand (3): to every steel strand (3) stretch-draw respectively, be stretched to specified value and make chuck component (9) locking steel strand (3) with punching jack (14);
(7), centrifugal forming;
(8), stream curing;
(9), form removal, cut off the steel strand (3) be positioned between anchor plate (5), stretch board (6) and put, remove being connected of anchor plate (5) and end plate (2);
(10), the steel strand (3) that will expose outside end plate (2) cut off and polish, and make steel strand (3) not expose outside the outer face of end plate (2).
5. manufacture method according to claim 4, it is characterized in that: on described stretch board (6), have several counterbores (62), in each counterbore (62), be placed with the transition member (10) that profile and counterbore (62) match, the front end of transition member (10) has the ring-type shoulder block portion (101) in the macropore portion that is sunken to described counterbore (62), and described bellmouth (61) is arranged in described transition member (10).
6. manufacture method according to claim 4, it is characterized in that: the periphery of the described chuck component (9) being comprised of multi-disc intermediate plate (8) is provided with cannelure (93), in this cannelure (93), is placed with multi-disc intermediate plate (8) is bound round to firm steel ring (94).
7. manufacture method according to claim 4, is characterized in that: described each chuck component (9) is comprised of three described intermediate plates (8).
8. manufacture method according to claim 4, it is characterized in that: described braced structures is many connecting rods (11), described many connecting rods (11) are arranged between described anchor plate (5) and stretch board (6) in the mode of the equal portion of circumference, and every connecting rod (11) is threaded with described anchor plate (5) and stretch board (6) respectively.
9. manufacture method according to claim 4, is characterized in that: described braced structures is tube connector (12), and the two ends of tube connector (12) are welded and fixed with described anchor plate (5) and stretch board (6) respectively.
10. manufacture method according to claim 4, it is characterized in that: the stretching mode in described step 6 is, the head of punching jack (14) is withstood to the outer face of intermediate plate assembly (6), steel strand (3) pass the head of punching jack (14) and are connected with the traction element of punching jack (14), the traction element pull steel strand (3) of punching jack (14) carry out stretch-draw and are stretched to specified value these root steel strand (3), make steel strand (3) that deformation occur, then unload punching jack (14), steel strand (3) bounce back under the effect of self deformation retraction force, the retraction of steel strand (3) drives chuck component (9) towards the small-bore direction retraction of bellmouth (61), chuck component (9) and bellmouth (61) firmly to be fixed, and make interior perforation (92) in chuck component further banding stuck steel strand (3).
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| CN201410034909.9A CN103741673B (en) | 2014-01-24 | 2014-01-24 | A kind of self-anchoring type steel strand pre-tensioning system centrifugal concrete pile and manufacture method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326897A (en) * | 2017-07-28 | 2017-11-07 | 宁波冶金勘察设计研究股份有限公司 | Armored concrete diaphram wall |
| CN107419747A (en) * | 2017-09-14 | 2017-12-01 | 上海岩土工程勘察设计研究院有限公司 | Can adaptive grooving deflection diaphram wall flexible steel twisted wire cage and its construction method |
| CN108943359A (en) * | 2018-08-20 | 2018-12-07 | 西平县华鼎电气装备有限责任公司 | A kind of concurrent production method |
| CN110238958A (en) * | 2019-05-31 | 2019-09-17 | 俞晓东 | Centrifugal concrete pile mould and the flat car to shelve the mold |
| CN112392034A (en) * | 2020-11-19 | 2021-02-23 | 浙江坤皇基础工程有限公司 | Combined prestressed concrete pipe pile |
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| CN101054800A (en) * | 2007-05-11 | 2007-10-17 | 上海中技桩业发展有限公司 | Prestress high intensity concrete square pile and its production method and moulding die |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326897A (en) * | 2017-07-28 | 2017-11-07 | 宁波冶金勘察设计研究股份有限公司 | Armored concrete diaphram wall |
| CN107419747A (en) * | 2017-09-14 | 2017-12-01 | 上海岩土工程勘察设计研究院有限公司 | Can adaptive grooving deflection diaphram wall flexible steel twisted wire cage and its construction method |
| CN107419747B (en) * | 2017-09-14 | 2019-10-25 | 上海岩土工程勘察设计研究院有限公司 | Can adaptive grooving deflection diaphram wall flexible steel twisted wire cage and its construction method |
| CN108943359A (en) * | 2018-08-20 | 2018-12-07 | 西平县华鼎电气装备有限责任公司 | A kind of concurrent production method |
| CN110238958A (en) * | 2019-05-31 | 2019-09-17 | 俞晓东 | Centrifugal concrete pile mould and the flat car to shelve the mold |
| CN112392034A (en) * | 2020-11-19 | 2021-02-23 | 浙江坤皇基础工程有限公司 | Combined prestressed concrete pipe pile |
| CN112392034B (en) * | 2020-11-19 | 2022-04-26 | 浙江浩达基础工程有限公司 | Combined prestressed concrete pipe pile |
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