Prestressing force for no reason sheet pile stretch-draw assembly, method for stretching and comprise the stake of this assembly
technical field
The present invention relates to the such as prestressed concrete such as pile tube and square pile prefabrication member field, relate in particular to the deformed bar in above-mentioned prestressed concrete member is carried out stretch-draw assembly, the method for stretching of prestressed stretch-draw and comprises the stake of said modules.
background technology
Prestressed concrete member, such as pile tube and square pile etc. are important pile foundation materials, especially pile tube, it is widely used in the foundation engineering of all kinds of buildings and construction, as fields such as skyscraper, public building, general industry and civil buildings, harbour, harbour, highway, bridges.
The traditional structure of pile tube comprises the parts such as concrete, steel reinforcement cage, end plate, anchor ear plate (also referred to as " anchor ear circle " or " skirtboard "), and pile tube is generally hollow.Wherein, concrete and steel reinforcement cage form the pile body of pile tube, steel reinforcement cage by main muscle or PC rod iron (being also " deformed bar ") and in the shape of a spiral the stirrup of continuous welding on main muscle form, steel reinforcement cage generally can be made by mechanized equipments such as seam welders.The two ends of pile tube pile body are pile crown, and traditional tubular pile head is made up of end plate and anchor ear plate, and end plate is arranged on the both ends of pile body, and anchor ear plate and end plate be by welding or the mode such as riveted joint is fixed together, thus further by end plate anchor ear on pile body.
End plate is connected with steel reinforcement cage, and in the time that main muscle is carried out to stretch-draw, end plate is while carrying out prestressed stretch-draw, to bear prestressed parts.The structure of end plate as shown in Figure 1, end plate 9 entirety are disc, in end sheet surface, be provided with the main muscle anchor hole 90 that multiple sizes are interconnected, wherein macropore is for wearing muscle hole 901, aperture is counter sink 902, rounded even cloth is on end plate 9 surfaces on the whole for the main muscle anchor hole 90 of above-mentioned many groups, and the number of above-mentioned main muscle anchor hole 90 is identical with main muscle number.
At present, the production process of pile tube mainly comprises the following steps: (1) forms steel reinforcement cage body by the main muscle after heading and stirrup by seam welder roll welding; (2) end plate and the welding of anchor ear plate are formed to pile crown; (3) carry out cloth by putting into pipe pile die after pile crown and the assembling of steel reinforcement cage body, and matched moulds; Wherein, in the time of assembling pile crown and steel reinforcement cage body, need to, by the main muscle after heading first by wearing muscle hole through after end plate, move to counter sink, thereby heading is stuck in counter sink; (4) utilize stretching machine to carry out stretch-draw to main muscle; (5) mould after matched moulds stretch-draw is placed on centrifuge, carry out centrifugal; (5) curing pool steam-cured or utilize autoclave to press to steam after, form pile tube finished product.
Wherein utilizing stretching machine to carry out, in prestressed stretch-draw process, substantially all adopting the mode of integral tension, the mode of integral tension has two kinds of forms: comprise tensioning head method and stretch-draw dish method.The two stretch-draw principle is the same, and while just adopting the stretch-draw of tensioning head method, the impetus of pulling force mainly concentrates on center bolt, and the impetus of pulling force is the neighboring that is distributed in stretch-draw dish when the stretch-draw of stretch-draw dish method.Therefore,, while adopting the stretch-draw of stretch-draw dish method, stressed comparatively even, end plate is difficult for tilting, and is particularly suitable for large and medium-sized pile tube to carry out stretch-draw.
For example publication number is CN 202219534 U, name is called in the patent of " tubular pile pre-stress tension tool " and discloses a kind of mode that adopts stretch-draw dish to carry out stretch-draw to the main muscle of prestressing force, wherein stretch-draw parts comprise stretch-draw screw mandrel, gripper shoe, locking nut, stretch-draw dish and stretch board, and the pass order of power is: stretching machine → stretch-draw screw mandrel → stretch-draw dish → stretch board → end plate → main muscle.
For example publication number is CN 202200392 U again, the patent that name is called " the stretch-draw assembly of the main muscle of a kind of stretch-draw prestressing force pile tube " discloses the mode that adopts tensioning head method to carry out stretch-draw to the main muscle of prestressing force in its background technology (seeing this patent accompanying drawing 6), wherein stretch-draw parts comprise tensioning head, stretch-draw screw mandrel, locking nut and a plate (being also " stretch board "), and the pass order of power is: stretching machine → tensioning head → stretch-draw screw mandrel → stretch board → end plate → main muscle.
Introduced from above-mentioned, in the prior art, no matter adopt which kind of mode to carry out stretch-draw to main muscle, stretching process is all as shown in accompanying drawing 2 and Fig. 3, the power of the generation of stretching machine is finally all passed through stretch board 6, also the connecting elements that is stretching machine and end plate 6 is delivered to end plate 9, thereby main muscle 5 is carried out to prestressed stretch-draw.
That is to say, in the prior art, when the main muscle of prestressing force is carried out to stretch-draw, end plate is being brought into play extremely important effect: a side of end plate needs and stretch board is fixed connection by nut etc., the opposite side of end plate need to carry out snapping by dowel hole and main muscle, and the power of the generation of stretching machine is finally delivered to main muscle.Also, in the prior art, end plate is to pile tube and be indispensable parts, and especially, in the time that main muscle is carried out to prestressed stretch-draw, end plate is essential especially.
And identical with pile for prestressed pipe, the manufacture process of prestress square pile comprises the steps such as the making, matched moulds cloth, prestressed stretch-draw of steel reinforcement cage, centrifugal, maintenance and high-pressure steaming and cultivating equally.And the main muscle of the prestressing force of square pile is carried out in the process of stretch-draw, prior art need to arrange end plate equally transmits the power of stretching machine.Therefore,, for the production of square pile, end plate is absolutely necessary equally.
But, no matter be in pile tube field or square pile field, in the time utilizing end plate to carry out stretch-draw, all exist following subject matter:
1, the production cost of end plate itself is compared with high: end plate operation in the time of processing and fabricating is many, and material and processing charges are high; And in the time making pile crown, end plate need to or weld with the riveted joint of anchor ear plate, this procedure needs manning and special equipment, is unfavorable for saving cost of labor and simplifies working process;
2, depositing or transportation end plates easily causes anchor ear plate generation deformation: end-plate material is thick, quality is large; And anchor ear plate material is thin, quality is light, therefore, by after end plate and the riveted joint of anchor ear plate or welding, easily causes the distortion of anchor ear plate in transportation;
3, main muscle and end plate assembling difficulty: cage muscle roll welding during to tail end main muscle do not worn muscle dish and retrained, main muscle roll welding location is inaccurate, there is position deviation, contraposition difficulty while causing the main muscle of cage muscle of roll welding moulding and the assembling of afterbody end plate, in the time that position deviation is excessive, cannot assemble, need strike loose cage muscle, operation repeatedly, efficiency is low;
4, in final finished peg, contain end plate, therefore the overall manufacturing cost of stake is higher.
summary of the invention
The object of the invention is to overcome weak point of the prior art, provides a kind of without end plate, and simple in structure, assembling flexibly, transport light, with low cost for straining sub-assembly and the method for stretching thereof of sheet pile for no reason.
In order to achieve the above object, the present invention adopts following scheme:
Prestressing force is a stretch-draw assembly for sheet pile for no reason, and described stretch-draw assembly comprises double-screw bolt and hollow swivel nut, and wherein, the middle part of described double-screw bolt is provided with through hole, for being connected with the main muscle of prestressing force; The mode that described double-screw bolt is threaded connection is connected with one end of described hollow swivel nut.
Further, the main muscle of described prestressing force is through heading processing; The through hole of described double-screw bolt axially comprises two-part structure along it: the main muscle perforation of counter sink and prestressing force, and wherein said counter bore diameter is greater than the main muscle perforation of described prestressing force; On the sidewall of described double-screw bolt, be also provided with the main muscle guide groove of prestressing force, in order to main the prestressing force through heading processing muscle is imported in counter sink.
Further, the outer wall of described double-screw bolt is provided with external screw thread; On the inwall of described hollow swivel nut, be provided with internal thread, described internal thread and described external screw thread are a pair of assembling screw threads, in order to described double-screw bolt and described hollow swivel nut are linked together.
Further, the other end of described hollow swivel nut is for being fixed connection with tensioning equipment.
Further, described hollow swivel nut is fixed and is connected with the stretch board on described tensioning equipment, wherein, on described stretch board, be provided with screw, the quantity of described screw and position are all corresponding with quantity and the position of the main muscle of prestressing force of required stretch-draw, and the internal diameter of described hollow swivel nut is identical with the aperture of described screw, described hollow swivel nut is fixed together by bolt and described stretch board.
Further, described stretch-draw assembly also comprises angle Support, and described angle Support comprises planar section and bent angle part, and described planar section is used for being socketed in described hollow swivel nut, and described bent angle part is used for being welded on anchor ear plate.
Further, on the planar section of described angle Support, be provided with locating hole, one end of described hollow swivel nut is provided with step, the diameter of described step is identical with the diameter of described locating hole, with so that described locating hole be linked on described step, thereby described angle Support and described hollow swivel nut are connected together.
Further, the number of described angle Support is at least three, and uniform welding is on anchor ear plate.
In addition, the present invention also provide simultaneously a kind of to prestressing force for no reason sheet pile carry out the method for prestressed stretch-draw, specifically comprise the following steps:
(a) steel reinforcement cage after machining is put into mould, wherein above-mentioned steel reinforcement cage is made up of the main muscle of prestressing force and the stirrup that is welded in the shape of a spiral on main muscle;
(b) double-screw bolt is arranged on the main muscle of described prestressing force;
(c) hollow swivel nut is arranged on described double-screw bolt;
(d) other end of described hollow swivel nut is fixed and is connected with tensioning equipment;
(e) utilize tensioning equipment to carry out stretch-draw, thereby complete the prestressed stretch-draw to the main muscle of described prestressing force.
Further, the main muscle of described prestressing force is through heading processing; The through hole of described double-screw bolt axially comprises two-part structure along it: the main muscle perforation of counter sink and prestressing force, and wherein said counter bore diameter is greater than the main muscle perforation of described prestressing force; On the sidewall of described double-screw bolt, be also provided with the main muscle guide groove of prestressing force; Wherein, in described step (b), the main muscle of described prestressing force is imported in described counter sink by the main muscle guide groove of described prestressing force.
Further, in described step (c), the outer wall of described double-screw bolt is provided with external screw thread, on the inwall of described hollow swivel nut, is provided with internal thread, described internal thread and external screw thread are a pair of assembling screw threads, by described internal thread and described external screw thread, described double-screw bolt and hollow swivel nut are linked together.
Further, in described step (d), described tensioning equipment has stretch board, described hollow swivel nut is fixed and is connected with described stretch board, wherein, on described stretch board, be provided with screw, the quantity of described screw and position are all corresponding with quantity and the position of the main muscle of prestressing force of required stretch-draw, and the internal diameter of described hollow swivel nut is identical with the aperture of described screw, described hollow swivel nut is fixed together by bolt and described stretch board.
Further, in described step (e), described tensioning equipment carries out stretch-draw to described stretch board, thereby at the prestressed stretch-draw completing the main muscle of described prestressing force.
Further, also comprise the steps: in step (c) with (d)
(f) provide angle Support, described angle Support comprises planar section and bent angle part, and described bent angle part is welded on anchor ear plate, and described planar section is socketed on described hollow swivel nut.
Further, on the planar section of described angle Support, be provided with locating hole, one end of described hollow swivel nut is provided with step, and the diameter of described step is identical with the diameter of described locating hole, described locating hole is linked on described step, thereby described angle Support and described hollow swivel nut are connected together.
Further, the number of described angle Support is at least three, and uniform welding is on anchor ear plate.
In addition, the present invention also provides a kind of prestressing force sheet pile for no reason simultaneously, and wherein said stake is pile tube or square pile, and described pile tube or square pile comprise above-mentioned arbitrary stretch-draw assembly.
In sum, with respect to prior art, prestressing force provided by the invention for no reason sheet pile stretch-draw assembly, method for stretching and comprise that the sheet pile for no reason of above-mentioned stretch-draw assembly has following beneficial effect:
The present invention in the prefabrication such as pile tube or square pile member is carried out to stretching process without adopting the end plate that must use in prior art, but adopt main muscle end-plate-free stretch-draw part combination, thereby reduce the loaded down with trivial details operation of making end plate, saved manually, saved cost, simplified operation; And the part that end-plate-free stretching method uses is little, assembles lightly, when operation, operating efficiency is high, and labour intensity is little; And owing to not containing end plate in final stake, therefore can reduce on the whole the manufacturing cost of making stake.
brief description of the drawings
Fig. 1 is the sectional elevation of end plate;
Fig. 2 is for there being the schematic diagram (sectional side elevation) of stretch-draw assembly of end plate stake in prior art;
Fig. 3 is for there being the schematic diagram (cross-sectional figure) of stretch-draw assembly of end plate stake in prior art;
Fig. 4 is of the present invention for the schematic diagram (sectional side elevation) of the stretch-draw assembly of sheet pile for no reason;
Fig. 5 is of the present invention for the schematic diagram of the stretch-draw assembly of sheet pile (cross-sectional figure) for no reason;
Fig. 6 is the schematic diagram (sectional side elevation) of the assembling of the stretch-draw assembly for sheet pile for no reason form 1 of the present invention, comprising double-screw bolt 1, hollow swivel nut 2 and angle Support 3;
Fig. 7 is the schematic diagram (sectional side elevation) of the assembling of the stretch-draw assembly for sheet pile for no reason form 2 of the present invention, comprising double-screw bolt 1 and hollow swivel nut 2;
Fig. 8 is the schematic diagram (sectional side elevation) of the double-screw bolt of one of stretch-draw assembly of the present invention;
Fig. 9 is another schematic diagram (cross-sectional figure) of the double-screw bolt of one of stretch-draw assembly of the present invention;
Figure 10 is the schematic diagram (sectional side elevation) of the hollow swivel nut of one of stretch-draw assembly of the present invention;
Figure 11 is the schematic diagram (cross-sectional figure) of the angle Support of one of stretch-draw assembly of the present invention;
Figure 12 is another schematic diagram (sectional side elevation) of the angle Support of one of stretch-draw assembly of the present invention;
Figure 13 is the schematic diagram (sectional side elevation) of stretch board;
Figure 14 is the schematic diagram (sectional side elevation) of stretch board bolt.
detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
As shown in Fig. 4 to Figure 14, stretch-draw assembly of the present invention mainly comprises double-screw bolt 1 and hollow swivel nut 2.In above-mentioned double-screw bolt 1, be provided with through hole, be used in while carrying out tension operation and be connected with the main muscle 5 of prestressing force, common connected mode is that main prestressing force muscle 5 is snapped onto in above-mentioned through hole.The outer wall of above-mentioned double-screw bolt 1 is provided with external screw thread 11.The inwall of above-mentioned hollow swivel nut 2 is provided with internal thread 21, this internal thread 21 is identical with external screw thread 11 specifications of above-mentioned double-screw bolt 1, be a pair of assembling screw thread, make above-mentioned hollow swivel nut 2 to assemble and to be fixed together with double-screw bolt 1 by internal thread 21 and external screw thread 11.Fig. 5 shows the situation that hollow swivel nut 2 and double-screw bolt 1 are assembled together.
In the time carrying out tension operation, the other end of above-mentioned hollow swivel nut 2 can be used for connecting the stretch board 6 of tensioning equipment.Above-mentioned hollow swivel nut 2 is fixed to the pulling force producing on above-mentioned stretch board 6 and by stretching machine and is delivered on the main muscle 5 of prestressing force, thereby the main muscle 5 of prestressing force is carried out to stretch-draw.Above-mentioned internal thread 21 is preferably full thread structure with external screw thread 11.
Preferably, as shown in figure 13, on above-mentioned stretch board 6, be provided with and all corresponding screws 61 of the quantity of the main muscle 5 of above-mentioned prestressing force and position.As shown in figure 14, bolt 7 comprises head 71 and bar portion 72, in above-mentioned bar portion 72, is provided with screw thread 73, and this screw thread 73 is identical with above-mentioned internal thread 21 specifications, is a pair of assembling screw thread.The diameter of the screw 61 of above-mentioned stretch board 6 be less than above-mentioned bolt 7 head 71 diameter but be more than or equal to the diameter of above-mentioned bar portion 72, thereby can allow above-mentioned bar portion 72 through and stop that above-mentioned head 71 passes.Wherein, in the time carrying out tension operation, allow the bar portion 72 of above-mentioned bolt 7 through the screw 61 of above-mentioned stretch board 6, the screw thread 73 in above-mentioned bar portion 72 is assembled with the internal thread 21 of above-mentioned hollow swivel nut 2, and above-mentioned hollow swivel nut 2 is fixed on above-mentioned stretch board.More preferably, above-mentioned screw thread 73 is full thread structure.
As shown in Figure 6, except above-mentioned double-screw bolt 1 and above-mentioned hollow swivel nut 2, stretch-draw assembly of the present invention preferably also further comprises angle Support 3.
As shown in Figure 11 and Figure 12, angle Support 3 has following structure: angle Support 3 comprises planar section 30 and bent angle part 32, wherein on planar section 30, be provided with locating hole 31, for being socketed with above-mentioned hollow swivel nut 2, bent angle part 32 is for welding with anchor ear plate 4, this angle Support 3 is located on anchor ear plate 4, thereby the location positioning of steel reinforcement cage is got off.Because in final production finished peg out, anchor ear plate, steel reinforcement cage have concrete position distribution relation.In the manufacturing process of stake, anchor ear plate 4 is to be fixed in mould.In the present invention, the main muscle 5 of prestressing force of steel reinforcement cage is to link together with double-screw bolt 1 and above-mentioned hollow swivel nut 2, therefore by the bent angle part 32 of angle Support 3 is welded on anchor ear plate 4, planar section 30 is socketed in and is stated on hollow swivel nut 2, the location that just can realize steel reinforcement cage simultaneously.Preferably, it is two that above-mentioned angle Support 3 arranges number, and uniform welding is on anchor ear plate 4, the location up and down that can realize like this steel reinforcement cage; More preferably, the number that above-mentioned angle Support 3 arranges is at least three, and uniform welding is on anchor ear plate 4, in realizing the location up and down of steel reinforcement cage, can also realize the location, left and right of steel reinforcement cage like this.
As shown in Figure 8 and Figure 9, double-screw bolt 1 of the present invention preferably has following structure: the through hole being connected with the main muscle 5 of above-mentioned prestressing force that double-screw bolt 1 center arranges axially comprises two-part structure along it, specifically comprise the main muscle perforation 13 of counter sink 12 and prestressing force, wherein counter sink 12 diameters are greater than the main muscle perforation 13 of prestressing force to hold the heading through the main muscle 5 of prestressing force of heading processing, and the main muscle perforation 13 of above-mentioned prestressing force can allow the main muscle 5 of above-mentioned prestressing force pass but can stop that the heading of the main muscle 5 of above-mentioned prestressing force passes.More preferably, a side of double-screw bolt 1 is also provided with the main muscle guide groove 14 of prestressing force, for the heading through the main muscle 5 of heading prestressing force after treatment is imported to counter sink 12.
As shown in Fig. 4, Fig. 6, Fig. 7 and Figure 10, preferably, one end of hollow swivel nut 2 of the present invention is provided with step 22, and the diameter of this step 22 is identical with the diameter of the locating hole 31 on angle Support 3, thereby step 22 and locating hole 31 form the equipped hole of a pair of clearance-type.Meanwhile, in the time that double-screw bolt 1 and hollow swivel nut 2 are threaded, this step 22 can make to operate more convenient.
Below in conjunction with prestressing force of the present invention for no reason the method for stretching of sheet pile the course of work of the present invention is further detailed.
As shown in Figure 4 and Figure 5, prestressing force of the present invention for no reason the method for stretching of sheet pile mainly comprise the following steps:
(a) steel reinforcement cage after machining is put into mould, wherein above-mentioned steel reinforcement cage is made up of the main muscle 5 of prestressing force and the stirrup that is welded in the shape of a spiral on main muscle 5, the main muscle 5 of prestressing force is along the longitudinal direction setting of pile body, and the end of the main muscle of prestressing force is through heading processing;
(b) at the above-mentioned double-screw bolt 1 of installing on the end of heading processing of the main muscle 5 of prestressing force, preferred installation process is: the main muscle guide groove 14 along this double-screw bolt 1 imports main prestressing force muscle in double-screw bolt 1, and the heading of the main muscle of prestressing force is dropped in the counter sink 12 of double-screw bolt 1;
(c) hollow swivel nut 2 is arranged on double-screw bolt 1, preferred installation process is: utilize the internal thread 21 of this hollow swivel nut 2 and the external screw thread 11 of double-screw bolt 1 that hollow swivel nut 2 is screwed on double-screw bolt 1, after its hollow core swivel nut 2 is screwed on double-screw bolt 1, the internal thread 21 that still remains with certain length is not assembled on double-screw bolt 1;
(d) stretch board 6 and hollow swivel nut 21 are fixed together, preferred installation process is: the bar portion 72 of bolt 7 can be through the screw 61 on stretch board 6, and be further screwed on hollow swivel nut 2, coordinate with the internal thread 21 of the certain length retaining on hollow swivel nut 2, thereby hollow swivel nut 2 is fixed on to stretch board 6.
In addition, if use angle Support 3 in stretching process, also can comprise the steps: in step (c) with (d) so,
(f) provide three or many angle Supports 3, it is evenly put and be welded on anchor ear plate 4 inner rings, and the welding assembly that the anchor ear plate 4 after welding is formed with described angle Support 3 is connected with hollow swivel nut 2, make the step 22 of hollow swivel nut 2 and the locating hole of described angle Support 3 31 phase fits, thereby angle Support 3 and hollow swivel nut 2 are connected together.
Through above-mentioned steps (d), complete the connection procedure of the stretch-draw sub-assembly of sheet pile for no reason of the present invention and stretching machine.
For the other end of the main muscle 5 of prestressing force, can adopt equally the stretch-draw assembly that comprises double-screw bolt 1 and hollow swivel nut 2 to be fixed on mould.
Next, can utilize the mode of the integral tension such as tensioning head method of the prior art or stretch-draw dish method, stretching machine is connected with stretch board, and then the main muscle of prestressing force is carried out to prestressed stretch-draw.
After stretch-draw step completes, above-mentioned stretch-draw assembly does not take out, but becomes a part of member of pile tube, proceeds other steps that pile tube is produced, until produce pile tube finished product.Therefore, above-mentioned stretch-draw assembly is also double-screw bolt 1 and hollow swivel nut 2 and also may comprise that angle Support 3 is all a part for final pile tube finished product.That is to say, utilize the pile tube that the present invention generates out not contain end plate, but contain above-mentioned stretch-draw assembly of the present invention.
By above to the present invention for no reason the structure of sheet pile stretch-draw sub-assembly and method for stretching introduce known, the present invention has successfully solved traditional existing following problem in end plate stake stretch-draw sub-assembly that has: end plate production process is many, cost is high, end plate and anchor ear plate riveting or welding need manning and special equipment, transportation in the distortion of anchor ear plate, the main muscle of cage muscle that cause and end plate assemble the problems such as contraposition difficulty, efficiency are low.Thereby reduce the loaded down with trivial details operation of making end plate, saved manually, saved cost, simplified operation; And the part that end-plate-free stretching method of the present invention uses is little, to assemble lightly, when operation, operating efficiency is high, and labour intensity is little; And owing to not containing end plate in final finished peg, therefore can reduce on the whole the manufacturing cost of making stake.
In addition, the above is only the description to specific embodiments of the invention.Although in above-mentioned specific embodiment,, taking pile tube as concrete example, principle of the present invention and technique effect are described, but those skilled in the art should recognize, technical scheme of the present invention is equally applicable to other similar prestressed concrete members, such as square pile etc.Because identical with pile tube, the manufacture process of prestress square pile comprises steps such as making steel reinforcement cage, cloth matched moulds, prestressed stretch-draw, centrifugal, maintenance and high-pressure steaming and cultivating equally.And the main muscle of the prestressing force of square pile is carried out in the process of stretch-draw, prior art need to arrange end plate equally transmits the power of stretching machine.Therefore for the manufacture of square pile, adopt technical scheme of the present invention, can solve the problems of the technologies described above equally.
In sum, the foregoing is only specific embodiments of the invention, but the present invention is not limited thereto, the variation that any those skilled in the art can think, all should drop in protection scope of the present invention.