CN103741673B - A kind of self-anchoring type steel strand pre-tensioning system centrifugal concrete pile and manufacture method thereof - Google Patents
A kind of self-anchoring type steel strand pre-tensioning system centrifugal concrete pile and manufacture method thereof Download PDFInfo
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- CN103741673B CN103741673B CN201410034909.9A CN201410034909A CN103741673B CN 103741673 B CN103741673 B CN 103741673B CN 201410034909 A CN201410034909 A CN 201410034909A CN 103741673 B CN103741673 B CN 103741673B
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Abstract
The present invention relates to a kind of self-anchoring type steel strand pre-tensioning system centrifugal concrete pile, comprise the concrete pile body of hollow, be positioned at the reinforcing cage of concrete pile body, reinforcing cage comprises the main muscle of axial arranged prestressing force, stirrup and end plate, it is characterized in that: the main muscle of prestressing force is steel strand, described each end plate has multiple perforation of passing for steel strand, perforation and steel strand are one-to-one relationship, steel strand through the perforation of end plate can be connected with the steel strand locking mechanism in the external world, described end plate also has multiple threaded connection hole in order to be connected with steel strand locking mechanism.So just, stretch-draw can be carried out by steel strand locking mechanism to steel strand in outside, then centrifugal forming is carried out, shaping complete after unload anchor plate, last severing exposes outside the steel strand of end plate and polishes, the centrifugal concrete pile manufactured does not protrude the ground tackle portion of end plate, is a kind of practicable centrifugal concrete pile with steel strand.
Description
Technical field
The invention belongs to the technical field of the pile foundation engineering of all kinds of architectural structure system, particularly relate 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, existing market applies to the many products of pile foundation comparison between projects 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, there is the defect with 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 to adopt and continuity uses so far always, dominate in current conventional piles Foundation Design.But in production and application process, main muscle adopts the centrifugal concrete pile of rod iron to there is more problem, and as rod iron fragility is comparatively large, its tensile strength is low, and (its tensile strength design load is 1000MPa, tensile strength peak is 1420MPa), current Building technology requirement cannot be met; For the ease of stretching in production, the technology of rod iron heading must be adopted, hot for rod iron upsetting is gone out a mushroom head, carries out prestressed stretch-draw so that this heading and pile body end plate, stretch board are blocked, but that the intensity at pier nose position can be caused to be undermined material is impaired due to the heading of hot this rod iron of upsetting; Meanwhile, because rod iron pier nose precision is inconsistent, fully cannot contact with end plate during stretch-draw, cause end plate local failure; Rod iron controls inadequate due to cutting accuracy, causes rod iron length to differ, there will be Stress non-homogeneity in stretching process, the phenomenon even broken; In addition, reinforcing cage system welding fabrication, rod iron causes Material damage because high temperature freezes.Above-mentioned many disadvantages, causes existing main muscle to adopt the technical performance such as bending resistance, shearing resistance of the centrifugal concrete pile of steel bar for prestressed concrete obviously not enough.In engineer applied, because earthquake, typhoon and other uncertain factors can cause top, buildings pile basis to produce larger moment of flexure and horizontal force, road and bridge or railway bridge also can produce larger moment of flexure and horizontal force because of the dynamic load of haulage vehicle.When above-mentioned traditional centrifugal concrete pile is used for above-mentioned engineering, often cannot use because of bending resistance and shear behavior deficiency, what show in highrise building is especially serious.In addition, in the engineering 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 has started to forbid using 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 mainly plays the effect of pile extension, in construction when the pile body pile extension of needs two or more, the end plate of the lower surface of the most beneath pile body and the upper surface of the top pile body is because needing without pile extension just obviously to belong to unnecessary parts; In the single pile body piling situation not needing 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 block end plate wants about 100 yuans, often need to use a large amount of centrifugal concrete piles in architecture construction, its waste or the cost increased are 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 first drills through a stake holes in building site, then reinforcing cage is put into stake holes, again to concrete perfusion in hole, can use after rear natural curing to be formed reaches some strength for a long time.This pile body has high bearing capacity because of it and can adapt to complicated geological and have stronger vitality, but this castinplace pile executes in making the mud taken out outside man-hour requirement process, 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 to waste 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 factorial praluction, thus 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, Chinese Enterprises 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 the technical scheme of practical value so far.A kind of reinforcing cage as disclosed in the patent No. Chinese utility model patent " a kind of pipe pile reinforcing bar cage being furnished with steel strand " that is ZL201220538453.6 (notification number is CN202865836U), its steel strand and prestressed steel bar with the use of, because rod iron and steel strand exist tensile strength difference, when applying integrated prestress at the same time, stretch-draw can only be controlled with the low tensile strength of rod iron, the high-tensile performance of steel strand is not out, therefore in that 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 tensile failure model.In addition, how concrete this patent not disclose in pre-tensioning system centrifugal concrete pile connection, fixing, tension steel strand, so this patented technology does not substantially have practical value and the operability of reality 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) discloses a kind of like this concrete tubular pile with steel strand, the main muscle of its prestressing force adopts steel strand, end plate has stretchable holes, and steel strand make ground tackle through stretchable holes.But this patent application does not disclose the connection of how specific implementation steel strand and end plate and anchoring and concrete production method thereof yet, and for the those of ordinary skill that pre-tensioning system centrifugal concrete pile manufactures field, 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, the accompanying drawing display of the technical scheme described according to it and this patent application, pile body end face after it is shaping has outstanding ground tackle, pile extension can not be realized, this outstanding ground tackle is easily broken in construction piling process, thus pile body prestressing force is destroyed and its technical performance such as bending resistance, shearing resistance that detracts.So, the technical scheme disclosed by it cannot be produced, even if produced and also cannot be practically applicable to pile foundation engineering at all, this patent has only proposed recapitulative technical though steel strand being applied to pre-tensioning system centrifugal concrete pile theoretically, but cannot be applied in reality production and construction.
As seen from the above, the prestressed centrifugally concrete pile that the main muscle used in a large number is in the market rod iron and bored pile can not meet the needs of current pile foundation engineering all, and adopt steel strand to be only also a kind of technical though at present as the pre-tensioning system centrifugal concrete pile of main muscle, because steel strand system forms by many steel wires are stranded, not easily weld, not easily be wound around, itself not easily realize and end plate or stretch board, the firm of anchor plate is fixed, therefore how steel strand are connected in pre-tensioning system centrifugal concrete pile, fixing and how carrying out stretch-draw to steel strand is realize manufacturing the key with the pre-tensioning system centrifugal concrete pile of steel strand, even to this day, there is no the appearance that the main muscle with building practical value is the centrifugal concrete pile of 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 steel strand and be connected and fixed problem in pre-tensioning system centrifugal concrete pile, make the main muscle of pre-tensioning system centrifugal concrete pile inside adopt steel strand become may and there is application value realistic, significantly improve the technical performances such as the bending resistance of centrifugal concrete pile, shearing resistance, tension
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, comprises the concrete pile body of hollow, is positioned at the reinforcing cage of concrete pile body; The end plate that reinforcing cage comprises the main muscle of axial arranged prestressing force, stirrup around the home outside described main muscle and at least one piece are positioned at concrete pile end of body; At least one end sleeve of described concrete pile body has pile protection hoop, and pile protection hoop is fixedly connected with end plate or one-body molded for steel drum structure; Pile protection hoop or end plate are fixedly connected with anchor rib; It is characterized in that: the main muscle of described prestressing force is steel strand, at least described one piece of end plate has multiple perforation of passing for steel strand, perforation and steel strand are one-to-one relationship, steel strand through the perforation of end plate can be connected with the steel strand locking mechanism in the external world, and tension steel strand before centrifugal forming also makes steel strand be locked by steel strand retaining mechanism; Described end plate also has multiple threaded connection hole in order to be connected with steel strand locking mechanism, described end plate is not subject to the retraction force of steel strand.
Above-mentioned end plate has two pieces, and every block end plate all has described perforation.
The thickness of above-mentioned pile protection hoop is 3mm ~ 15mm.The bending resistance shear behavior of concrete pile end of body is made to reach the mechanical property in non-self anchor 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), by pile protection hoop with end plate to be fixedly connected with or one-body molded for steel drum structure, pile protection hoop or end plate are fixedly connected with anchor rib;
(3), in the outer face of end plate be fixedly connected with steel strand locking mechanism, and allow every root steel strand on reinforcing cage through the bellmouth on the stretch board of the perforation be positioned on end plate and steel strand locking mechanism;
(4), by the reinforcing cage in step 3 be 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, close upper mold section;
(6), tension steel strand: with the stretch-draw respectively of the every root steel strand of punching jack pair, be stretched to specified value and make chuck component lock steel strand;
(7), centrifugal forming;
(8), stream curing;
(9), form removal, the steel strand cut off between anchor plate, stretch board are put, remove the connection of anchor plate and end plate;
(10), by the steel strand exposing outside end plate cut off and polish, making steel strand not expose outside the outer face of end plate.
This manufacture method is difference stretching type, and make 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, 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 the braced structures be supported between anchor plate and stretch board, this braced structures is fixed with anchor plate and stretch board respectively, wherein, anchor plate is fixedly connected with end plate by bolt, described stretch board is provided with the bellmouth that several aperture from the inside to the outside expands gradually, bellmouth and steel strand one_to_one corresponding are arranged, multi-disc intermediate plate is placed with in each bellmouth, the inner surface of each intermediate plate is provided with latch, this multi-disc intermediate plate split forms the chuck component in order to clip steel strand, the outer peripheral face of this chuck component forms the cone face matched with described bellmouth, internal tooth hole is formed centrally in chuck component, described each steel strand are all through the interior perforation in corresponding chuck component.
Above-mentioned stretch board has several counterbore, and 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 be sunken in the macropore portion of described counterbore, and described bellmouth is arranged in described transition member.By arranging transition member in stretch board, and bellmouth is arranged in transition member, it is more convenient that bellmouth is compared in processing due to counterbore, and in transition member, process bellmouth compare and on stretch board, process bellmouth 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 be made up of multi-disc intermediate plate is provided with cannelure, is placed with the steel ring in multi-disc intermediate plate hoop jail in this cannelure.The chuck component that this structure can make multi-disc intermediate plate form is more firm.
Above-mentioned each chuck component is made up of three described intermediate plates.Prove through overtesting, 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 in the equal portion of circumference, and every root 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 the outer face of clip assemblies, 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 to these root steel strand and are stretched to specified value, make steel strand generation deformation, then punching jack is unloaded, steel strand bounce back under the effect of self-deformation retraction force, the retraction of steel strand drives chuck component chuck component and bellmouth firmly to be fixed towards direction, the small-bore retraction of bellmouth, and make the further banding of interior perforation in chuck component and 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, each end plate has multiple perforation of passing for steel strand, perforation and steel strand are one-to-one relationship, make the steel strand through the perforation of end plate can be connected with the steel strand locking mechanism in the external world like this, so just, can be fixed steel strand by steel strand locking mechanism in outside, stretch-draw, then centrifugal forming is carried out, shaping complete after unload anchor plate, steel strand are put and opens, last severing exposes outside the steel strand of end plate and polishes, the centrifugal concrete pile manufactured 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 centrifugal concrete pile to be achieved and the real value with industrial applicability, and, can according to the needs of practice of construction pile extension, one piece of end plate can be respectively set at concrete pile body two ends, also can one piece of end plate be only at one end set, the other end does not need to establish end plate and pile protection hoop, thus can the materials such as end plate be saved, because all there is steel strand locking mechanism at reinforcing cage two ends in order to fixing steel strand in production, so the presence or absence of end plate does not affect steel strand being fixedly connected with in centrifugal concrete pile, stretch-draw, centrifugal concrete pile of the present invention, because have employed the high steel strand of performance, makes its bending resistance, shearing resistance, tensile property greatly improve.
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 the schematic diagram (removing upper mold section) of the manufacture method manufacturing 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 previous building methods;
Fig. 7 is the three-dimensional exploded view of chuck component in previous building methods;
Fig. 8 is the structural representation that bellmouth is arranged in transition member by previous building methods;
Fig. 9 is that previous building methods adopts tube connector as the structural representation of braced structures.
Figure 10 is the perspective view manufacturing aforementioned self-anchoring type steel strand pre-tensioning system centrifugal concrete pile mould therefor.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
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 the concrete pile body 1 of hollow, 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.The end plate 2 that reinforcing cage comprises the main muscle of axial arranged prestressing force, stirrup 4 around the home outside described main muscle and at least one piece are positioned at concrete pile body 1 end; Concrete pile body 1 two ends are all overlapped and are had pile protection hoop 13, and pile protection hoop 13 is fixedly connected with end plate 2 or one-body molded for steel drum structure; Pile protection hoop 13 or end plate 2 are fixedly connected with anchor rib 15.Concrete pile body 1 axial arrangedly can also have nonprestressed reinforcement.The thickness of pile protection hoop 13 is 3mm ~ 15mm.
Each end plate 2 has multiple perforation 21 of passing for steel strand, perforation 21 and steel strand 3 are one-to-one relationship, steel strand 3 through the perforation 21 of end plate can be connected with the steel strand locking mechanism in the external world, and tension steel strand 3 before centrifugal forming also makes steel strand 3 be locked by steel strand retaining mechanism; End plate 2 also has multiple threaded connection hole 22 in order to be connected with steel strand locking mechanism, described end plate 2 is not subject to the retraction force of steel strand 3.
The body of rod that the centrifugal concrete pile of what the present invention mentioned have steel strand can be used as electric pole uses, and the ground upper support bar that also can be used as in telecomm base station, wind generator system uses, and also can be used as the supporter of other ground surface works, operation strategies is extremely wide.
As shown in Fig. 3 ~ 10, be a kind of manufacture method 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), by pile protection hoop 13 with end plate 2 to be fixedly connected with or one-body molded for steel drum structure, pile protection hoop 13 or end plate 2 are fixedly connected with anchor rib 15;
(3), be fixedly connected with the locking mechanism of steel strand in the outer face of end plate 2, and allow on reinforcing cage every root steel strand 3 through the bellmouth 61 on the perforation 21 be positioned on end plate and stretch board 6;
Steel strand locking mechanism comprises anchor plate 5, stretch board 6 and the braced structures be supported between anchor plate 5 and stretch board 6, this braced structures is fixed 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 aperture from the inside to the outside expands gradually, bellmouth 61 and steel strand 3 one_to_one corresponding are arranged, multi-disc intermediate plate 8 is placed with in each bellmouth 61, the inner surface of each intermediate plate 8 is provided with latch 81, this multi-disc intermediate plate 8 split 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 matched with bellmouth 61, internal tooth hole 92 is formed centrally in chuck component 9, each steel strand 3 are all through the interior perforation 92 in corresponding chuck component.
(4), by the reinforcing cage in step 3 be placed in female die 13a, the anchor plate 5 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, close upper mold section 13b;
(6), tension steel strand 3: with punching jack 14 to the stretch-draw respectively of every root steel strand 3, be stretched to specified value and make chuck component 9 lock steel strand 3, during stretch-draw, the head of punching jack 14 is withstood the outer face of clip assemblies 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 to these root steel strand 3 and are stretched to specified value, make steel strand 3 that deformation occur, then punching jack 14 is unloaded, steel strand 3 bounce back under the effect of self-deformation retraction force, the retraction of steel strand 3 drives chuck component 9 chuck component 9 and bellmouth 61 firmly to be fixed towards direction, the small-bore retraction of bellmouth 61, and make the further banding of the interior perforation 92 in chuck component and stuck steel strand 3.
(7), centrifugal forming;
(8), stream curing;
(9), form removal, the steel strand 3 cut off between anchor plate 5, stretch board 6 are put, remove the connection of anchor plate 5 and end plate 2;
(10), by the steel strand 3 exposing outside end plate 2 cut off and polish, making 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 in the equal portion of circumference, and every root 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 made up of three described intermediate plates 8.The periphery of the chuck component 9 be made up of three intermediate plates 8 is provided with cannelure 93, is placed with the steel ring 94 multi-disc intermediate plate 8 being bound round jail in this cannelure 93.
As shown in Figure 7, certainly also several counterbore 62 can be had on stretch board 6, the transition member 10 that profile and counterbore 62 match is placed with in each counterbore 62, the front end of transition member 10 has the ring-type shoulder block portion 101 in the macropore portion being 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, comprises the concrete pile body (1) of hollow, is positioned at the reinforcing cage of concrete pile body (1); The end plate (2) that reinforcing cage comprises the main muscle of axial arranged prestressing force, stirrup (4) around the home outside described main muscle and at least one piece are positioned at concrete pile body (1) end; Described concrete pile body (1) at least one end sleeve has pile protection hoop (13), and pile protection hoop (13) is fixedly connected with end plate (2) or one-body molded for steel drum structure; Pile protection hoop (13) or end plate (2) are fixedly connected with anchor rib (15); It is characterized in that: the main muscle of described prestressing force is steel strand (3), at least one piece of end plate (2) has multiple perforation (21) of passing for steel strand, perforation (21) and steel strand (3) are one-to-one relationship, steel strand (3) through the perforation (21) of end plate can be connected with the steel strand locking mechanism in the external world, and tension steel strand (3) before centrifugal forming also makes steel strand (3) be locked by steel strand retaining mechanism; Described end plate (2) also has multiple threaded connection hole (22) in order to be connected with steel strand locking mechanism, described end plate (2) is not subject to the retraction force of steel strand (3).
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 pieces, every block end plate all has described perforation (21).
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 the self-anchoring type steel strand pre-tensioning system centrifugal concrete pile as described in aforementioned any one of claims 1 to 3, is characterized in that: described manufacture method comprises following steps
(1), the customized cut-off of steel strand (3), make reinforcing cage;
(2), by pile protection hoop (13) with end plate (2) to be fixedly connected with or one-body molded for steel drum structure, pile protection hoop (13) or end plate (2) are fixedly connected with anchor rib (15);
(3), make the locking mechanism that two are fixedly connected with steel strand, the locking mechanism of each steel strand comprises anchor plate (5), stretch board (6) and the braced structures be supported between anchor plate (5) and stretch board (6), this braced structures is fixed 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 aperture from the inside to the outside expands gradually, bellmouth (61) and steel strand (3) one_to_one corresponding are arranged, multi-disc intermediate plate (8) is placed with in each bellmouth (61), the inner surface of each intermediate plate (8) is provided with latch (81), this multi-disc intermediate plate (8) split 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) matched with described bellmouth (61), internal tooth hole (92) is formed centrally in chuck component (9), each steel strand (3) are through passing perforation (92) in corresponding chuck component after anchor plate again,
(4), by the reinforcing cage in step 3 be placed in female die (13a), the anchor plate (5) at reinforcing cage two ends and the outer face of female die (13a) are fastened, thus fixing whole reinforcing cage;
(5), to female die (13a) feeding, the upper mold section that closes (13b);
(6), tension steel strand (3): by punching jack (14) to the stretch-draw respectively of every root steel strand (3), be stretched to specified value and make chuck component (9) lock steel strand (3);
(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 to put, remove the connection of anchor plate (5) and end plate (2);
(10), by the steel strand (3) exposing outside end plate (2) cut off and polish, making 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: described stretch board (6) has several counterbore (62), the transition member (10) that profile and counterbore (62) match is placed with in each counterbore (62), the front end of transition member (10) has the ring-type shoulder block portion (101) in the macropore portion being 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 chuck component (9) be made up of intermediate plate described in multi-disc (8) is provided with cannelure (93), be placed with the steel ring (94) in multi-disc intermediate plate (8) hoop jail in this cannelure (93).
7. manufacture method according to claim 4, is characterized in that: each described chuck component (9) is made up 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), many described connecting rods (11) are arranged between described anchor plate (5) and stretch board (6) in the mode in the equal portion of circumference, and every root 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 the outer face of clip assemblies (9), steel strand (3) through punching jack (14) head and be connected with the traction element of punching jack (14), the traction element pull steel strand (3) of punching jack (14) carry out stretch-draw to these root steel strand (3) and are stretched to specified value, make steel strand (3) that deformation occur, then punching jack (14) is unloaded, steel strand (3) bounce back under the effect of self-deformation retraction force, the retraction of steel strand (3) drives chuck component (9) chuck component (9) and bellmouth (61) firmly to be fixed towards direction, the small-bore retraction of bellmouth (61), and make the further banding of the interior perforation (92) in chuck component and stuck steel strand (3).
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN107326897B (en) * | 2017-07-28 | 2022-09-27 | 宁波冶金勘察设计研究股份有限公司 | Reinforced concrete underground continuous wall |
| 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 |
| CN108943359B (en) * | 2018-08-20 | 2020-07-24 | 西平县华鼎电气装备有限责任公司 | Production method of concrete pole |
| CN110238958A (en) * | 2019-05-31 | 2019-09-17 | 俞晓东 | Centrifugal concrete pile mould and the flat car to shelve the mold |
| 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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| US4604003A (en) * | 1983-02-22 | 1986-08-05 | Francoeur Ronald A | Method and apparatus for retensioning prestressed concrete members |
| 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 |
| CN101603312A (en) * | 2009-03-09 | 2009-12-16 | 凌德祥 | Pre-stressed concrete hollow square stake and preparation method thereof |
| CN101544020A (en) * | 2009-04-15 | 2009-09-30 | 李国华 | Preparation method for prestressed high-strength concrete pile |
| CN203821379U (en) * | 2014-01-24 | 2014-09-10 | 俞向阳 | Self-anchored steel strand pretensioned centrifugal concrete pile and steel strand locking structure |
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