CN1026395C

CN1026395C - Method of manufacturing hollow concrete pile and apparatus for manufacturing same

Info

Publication number: CN1026395C
Application number: CN 91101420
Authority: CN
Inventors: 佐滕昌义
Original assignee: HOKUYU SANGYO KK
Current assignee: HOKUYU SANGYO KK
Priority date: 1991-03-09
Filing date: 1991-03-09
Publication date: 1994-11-02
Anticipated expiration: 2006-03-09
Also published as: CN1064720A

Abstract

The present invention relates to a method and a device for manufacturing hollow concrete piles. In the state that a tubular component expands in the radial direction, concrete is cast at the outer side of the tubular component, and a retaining device is used to retain the tubular component; after the concrete is hardened, the tubular component contracted in the radial direction is drawn out. Therefore, the tubular component for forming a hollow part can be retained simply, and the tubular component can be easily drawn out of the hollow part.

Description

Method of manufacturing hollow concrete pile and apparatus for manufacturing same

The present invention relates to be used for the preparation method and the device of prefabricated hollow concrete stake on the basis of various building structures.

About concrete-pile, have in advance after factory etc. locates with template construct, it is squeezed into or is embedded in the precast concrete pile in the ground, and bore to dig behind the ground and concrete cast directly in this hole and the cast-in-place concrete stake of making.

In these concrete-piles, particularly Zhuan core axially has the prefabricated hollow concrete stake of hollow parts along it, in order to form hollow parts, for a long time, generally uses core to make.

That is, will be arranged on the core of template,, thereby make the precast concrete pile of hollow parts at this core outside cast concrete by the core that steel pipe or plastic tube are made.

In addition, the clear 62-174109 of Japanese Patent Application Laid-Open number a kind of like this preparation method of precast concrete pile is disclosed, the tubulose core of plastic softness promptly is set in the centre of template, the inside of this core is imposed hydraulic pressure after, at the outside of this core cast concrete.After treating concrete curing, eliminate the fluid pressure of core, make the core atrophy and extract, thereby make the precast concrete pile of hollow parts.

But there is following problems in the preparation method of the prefabricated hollow concrete stake of above-mentioned prior art: make core keep concentric to bother very much with respect to template; And after concrete setting, core is extracted from hollow parts, also be very difficult.

For example, when keeping core, core is fixed on the above-mentioned reinforcing bar by the fixing iron wire of usefulness by being embedded in reinforcing bar in the concrete-pile.But, just need considerable labour and time, thereby reduced system stake efficient significantly if when constructing the fixed position in a large number by about 50 centimetres spacing.

In addition, if do not extract core from hollow parts, but when core was embedded under the state in the concrete-pile pile anchoring, a pile just needed a core so, has therefore improved production cost, and economic benefit is very poor.

Shown in above-mentioned known example, though use the method for tubulose core can solve the problem of using core repeatedly,, with respect to template the core of particularly soft is held in concentric shape, be the thing that bothers very much.

In addition, when the template that usage level is provided with, thereby compare with the known flospinning that makes the template rotation form hollow parts, though manufacturing equipment is simple, but also have following problem: core is arranged in the horizontal template, and behind the cast concrete, because core or can float or can sink, so in horizontally disposed template, core is held in concentric shape, be very difficult; And the precision of hollow parts is low, has both made to allow the core atrophy also be difficult to release.

Therefore, the present invention is a kind of scheme that proposes in order to address the above problem, its purpose is to provide a kind of preparation method and producing device of prefabricated hollow concrete stake, even under the situation of the template that usage level is provided with, it also can will form the core that hollow parts uses simply with respect to template and be held in concentric shape, but also can from hollow parts this core be released at an easy rate.

In order to achieve the above object, scheme of the present invention is as follows: use to have tubular part that elasticity can breathing as core, this tubular part is inserted in the horizontally disposed template, in tubular part, be pressed into liquid, make this tubular part be radial expanded state, cast concrete between template and tubular part, because the difference of specific gravity that concrete produced, make tubular part be subjected to buoyancy and float, push this tubular part with holding device, and make it be held in concentric with respect to template, after the concrete cast finishes, lay down holding device, treat to form hollow parts by tubular part behind the concrete curing, remove the interior pressure of tubular part then, make the tubular part radial contraction, tubular part is pulled out from hollow parts.

According to the present invention of above-mentioned formation, tubular part is radially expanded owing to being pressed into the liquid generation, and becomes very firm core, and under the state that has expanded, floating in concrete contacts with holding device, and is kept.Therefore, both made under the situation of the template that usage level is provided with, needn't carry out the fixed operation of trouble, and just can make tubular part simply and positively keep concentric with respect to horizontal template.

And in the hollow parts that shape forms with one heart accurately, therefore tubular part just can be extracted this tubular part from hollow parts easily because the living radial contraction of cutting down output in removing makes its diameter littler than the internal diameter of hollow parts.

According to above-mentioned the present invention, compare with the flospinning that template is rotated, manufacturing equipment is simple, even under the situation of the template that usage level is provided with, needn't carry out the fixed operation of trouble, just can make tubular part simply and reliably keep concentric, therefore can reduce labour and the man-hour that tubular part is set significantly, and can improve the production efficiency of prefabricated hollow concrete stake significantly with respect to template.

And, owing to can form concentric hollow parts and collapsible tubulose parts accurately, can easily tubular part be pulled out, thereby can use this tubular part repeatedly, can reduce the production cost of prefabricated hollow concrete stake significantly, increase economic efficiency significantly.

In addition, after finishing concrete cast, the holding device of dismantling, thereby the prefabricated hollow concrete stake that can manufacture even matter can improve tension, resistance to compression, bending resistance equal strength significantly.

As follows to Brief Description Of Drawings:

The 1st figure to the 13 figure represent to apply the present invention to the preparation method of prefabricated hollow concrete stake and the embodiment of producing device.

The 1st figure is the oblique view of the part of the stake representing to manufacture with section.

The 2nd figure is the oblique view at mold closing state lower bolster one end.

The 3rd figure is the sectional drawing of the arrow points of III among the 2nd figure-III line.

The 4th figure is the sectional drawing of the arrow points of IV among the 2nd figure-IV line.

The 5th figure is the front view at die opening state lower bolster one end.

The 6th figure is a sectional drawing identical with the 3rd figure under die opening state.

The 7th figure is the front view of template one end in the distortion example.

The 8th figure is the skiagraph of device one end when making stake.

The 9th figure is the skiagraph of tubular part.

The 10th figure and the 11st figure are the key diagrams of the manufacture method of expression tubular part.

The 12nd figure is the amplification profile diagram of the arrow points of XII among the 8th figure-XII line.

The 13rd figure is the oblique view that the nut of expression prestressed concrete reinforcing steel tension equipment rotates.

1 ... concrete-pile; 3 ... hollow parts; 10 ... template; 11 ... patrix; 12 ... counterdie; 14 ... opening portion; 40,90 ... the pin hinge; 44,45 ... check plate; 46 ... the stop device holding components; 48 ... arresting lever; 70 ... the water of pressurization; 71 ... concrete; 82 ... hydraulic cylinder; 85a ... locking plate; 88 ... retainer; 91,92 ... the pin jack; 100 ... tubular part; 101 ... flexible pipe; 104 ... enclosure portion; 120 ... holding device; 121 ... keeper; 123 ... erector; 124 ... hook; 126 ... control stick; 127 ... extension spring.

Following with reference to the description of drawings embodiments of the invention.

The 1st Tu-the 13rd figure represents the preparation method of prefabricated hollow concrete stake and the embodiment of producing device.

At first shown in the 1st figure, the concrete-pile 1 of Zhi Zuoing is a kind of member of big length of regular hexagon section in the present embodiment, protrudes several joints 2 in its periphery along axial spacing according to the rules.And form the hollow parts 3 of circular cross section vertically at the core of stake 1.The 4th, apply prestressed some embedding vertically (is 6 in this example) prestressed concrete reinforcing steels.Therefore, this 1 is exactly the hexagon hollow prestressed concrete stake of so-called band joint.

Secondly, shown in the 2nd figure to the 6 figure, the template 10 that above-mentioned concrete-pile 1 moulding is used is made of patrix 11 that separates up and down along the central water plane and counterdie 12.And the length of template 10 is about 7 times (in fact about 13 meters) of length shown in the 2nd figure, also has identical construction without the illustrated other end, and the illustrated structure in some places is arranged between these two ends.

Shown in the 3rd figure and the 6th figure, patrix 11 has the side plate 13 that forms stake 1 outer surface, and top is the opening portion 14 that cast concrete is used.And for example shown in the 2nd figure and the 4th figure, the projection 15 of the joint 2 that forms stake 1 is set on side plate 13, the top of this projection 15 also is opening portion 16.And the reinforcement feature 17 of a pair of U of being font is fixed on two outsides of projection 15 vertically, and these reinforcement features 17 are connect by coupling component 18 on top.Shown in the 2nd figure and the 5th figure, the end plates 19 of semicircular in shape are fixed on the end of side plate 13 and reinforcement feature 17.Therefore, reinforcement feature 17, coupling component 18 and end plates 19 have constituted the framework of patrix 11.

On the other hand, shown in the 3rd figure and the 4th figure, the formation of counterdie 12 formation with patrix 11 substantially is identical, has side plate 23, a pair of reinforcement feature 27 and the end plates 29 etc. that are provided with projection 25 to constitute the framework of counterdie 12.In addition, on lower frame 12, do not have above-mentioned

opening portion

14,16, but entirely shut.Be provided with some paired legs 30 in the bottom of counterdie 12, template 10 is arranged to horizontal by these root legs 30.In addition, on leg 30, be provided with the buffer unit of making by rubber slab 31, when compacted concrete, with of the vibration of its absorption in template 10.

Like this, shown in the 2nd figure to the 6 figure, pin hinge 40 is set in a side of the die joint of patrix 11 and counterdie 12.This pin hinge 40 is made of

lug

41,42 and pivot pin 43, and the side that lug 41,42 is separately positioned on patrix 11 and counterdie 12 is outwards protruded separately, and pivot pin 43 rotations are bound up these

lugs

41,42 freely.Be respectively equipped with the

check plate

44,45 of outside protrusion in a side of

end plates

19,29, constitute the 1st stop device by these check plates 44,45.On counterdie 12, rely on lug 47 that the stop device holding components of being made by pipe 46 vertically has been installed, on this brake apparatus holding components 46, constitute the arresting lever 48 that can insert, and become the 2nd stop device.In addition, near the two ends of template 10 and two places between them, add up to 4 places that pin hinge 40 is set, 46 of

check plate

44,45 and stop device holding components are arranged near the two ends of template 10.

The template 10 of Gou Chenging as stated above, at first under the mold closing state shown in the 2nd figure to the 4 figure, the

lateral margin

50,51 of the patrix 11 and the die joint of counterdie 12 closely is connected, and forms the space that is the hexagonal column that cast concrete is used in template 10.In addition, patrix 11 and counterdie 12 also combine with many screws 52 securely in

lateral border

50,51 parts of

projection

15,25 and the Outboard Sections of

end plates

19,29.

Secondly, as shown in the 5th figure and the 6th figure, when die sinking, unclamp screw 52,, raise up with lifts such as crane or hoist engine (without diagram) with a side's fixing on the reinforcement feature 17 of patrix 11 suspension ring 33a.In addition, the opposing party's suspension ring 33b is that 33a uses with suspension ring when being provided with after with 10 carryings of whole template with lift.When mentioning patrix 11, pin hinge 40 is set, thereby patrix 11 rotates for direction shown in the middle mind-set arrow a with pin hinge 40 in a side of patrix 11 and counterdie 12.And patrix 11 turns to than 90 ° big and when roughly being the state of vertical configuration, and the end face of

check plate

44,45 contacts with each other, patrix 11 thereby stop operating.And under the state of die sinking, the arresting lever 48 vertical brake apparatus that insert are supported in the part 46.Therefore, patrix 11 has lateral margin 50 just to contact with arresting lever 48, thereby stops patrix 11 to go back to original position.

Secondly, when mold closing, arresting lever 48 is extracted from stop device holding components 46, lift is descended, and patrix 11 is rotated to direction shown in the arrow b.Shown in the 3rd figure and the 4th figure, the

lateral margin

50,51 of patrix 11 and counterdie 12 closely fastens once again.

As mentioned above, patrix 11 rotates freely by pin hinge 40, therefore a template 10 is opened when carrying out operation, does not need to keep with lift with patrix 11 state of slinging.So, a lift is moved freely, just can carry out die sinking, mold closing operation simultaneously abreast to several templates 10.In addition, making patrix 11 is the structure that rotate at the center with the pin hinge 40 of a side, compares with the structure of the whole patrix 11 of slinging, and required power is approximately half, therefore can use dumbwaiter.Mold closing is to lean on patrix 11 to cut with scissors 40 with pin to be the rotation at center, so do not need special operation, just can to carry out the location of patrix 11 and counterdie 12 very simply.Again because patrix 11 does not separate with counterdie 12, so when operation, do not move the danger that the workman is wounded because of the accident of patrix 11.

When patrix 11 roughly forwards plumbness to, just it is stopped by

check plate

44,45, thus when die sinking, can make the shared spaces of patrix 11 for minimum, and on can be at the scene polylith template 10 be set.Again at this moment, though patrix 11 oriented mold closing directions are done the danger that accident is rotated, but stoped patrix 11 to go back to original position reliably, so security is very high by arresting lever 48.

Secondly, in the above-described embodiment, die sinking and mold closing rotate patrix 11 by lift, but in the distortion example shown in the 7th figure, but at 10 drive units that are provided with patrix 11 on one's body of template.Be about to installing plate 80 and be fixed on the end plates 29 of counterdie 12, support 81 first line of a couplet that are provided with on this piece installing plate 80 are knotted the end of hydraulic cylinder 82.And support 83 first line of a couplet that are provided with on the end plates 19 of patrix 11 are knotted the end of piston rod 84.In this distortion example, be provided with the

lug

85,86 of outside protrusion respectively in a side of

end plates

19,29, these

lug

85,86 usefulness pivot pins 87 are tied, and constitute pin and cut with scissors 90.And the leading section of lug 85 protrudes more, becomes locking plate 85a, is fixing retainer 88 on end plates 29.On locking plate 85a and lug 86, be provided with

pin jack

91,92 again respectively.

According to this distortion example, when making the piston rod 84 of hydraulic cylinder 82 flexible, it is that direction is rotated relative to counterdie 12 shown in middle mind-set arrow a, the b that patrix 11 just cuts with scissors 90 with pin.Thereby needn't use lift, just can on each piece template 10 itself, carry out die sinking and mold closing.Patrix 11 rotates along arrow a direction and is a bit larger tham 90 ° when roughly being vertical configuration, and locking plate 85a just contact with retainer 88, and stops its rotation (owing to effect of the 1st retainer).And locking pin (without diagram) inserted accord with in the

pin jack

91,92 of this state, stop patrix 11 to go back to original position (because effect of the 2nd retainer) along the direction of arrow b indication.Promptly in this distortion example,, and make its structure become compact owing to the rotating fulcrum and the rotating retainer of dual-purpose patrix 11.

Secondly, shown in the 8th figure and the 9th figure, form the used tubular part 100 of hollow parts 3 of concrete-pile 1, be by have elasticity, can breathing and tough synthetic resin flexible pipe 101 constitute.In the present embodiment, agricultural is cut into desirable length (being 10 meters in this example) with cylindric vinylon plain weave canvas system flexible pipe (outer diameter D is 160 millimeters, and the thick t of cloth is 2 millimeters), and imposes fluid-tight ethlyene dichloride coating on its surface and the inside.Again, vinylon is trade mark., and in addition fastening with rope with ironware 103 with an end colligation of flexible pipe 101, thereby flexible pipe 101 shape pouches, make its enclosure portion 104 be positioned at a bag shape inside partly.Seal ironware 105 at the inner setting-in of the other end of flexible pipe 101 again, fastening with cranse 105.The welding pipe 107 on the ironware 105 that seals above-mentioned by stop valve 108, is connected with flexible pipe 109.And flexible pipe 109 is connected with the discharge outlet of pump 110, and the water inlet of this pump 110 just is communicated with water tank 111.In addition, the 112nd, the motor that driving pump is used, the 113rd, pressure gauge, the 114th, pressure-reducing valve.

As mentioned above, make the enclosure portion 104 of flexible pipe 101 be positioned at bag inside of shape part, and for example the back is described, and when being pressed into water in tubular part 100, hydraulic pressure P just works, and the hose end at enclosure portion 104 places is connected airtight mutually.Thereby can positively prevent to leak from enclosure portion 104, guarantee impermeability completely.In addition, enclosure portion 104 is not exposed to the outside of tubular part 100, so concrete is unlikely enclosure portion 104 is wrapped.Therefore, there is not the difficulty of tube drawing shape parts 100, do not need to cover enclosure portion 104 yet with protective cap.

Yet it is very difficult making enclosure portion 104 be positioned at bag inside of shape part on the flexible pipe 101 of above-mentioned big length.Therefore, when manufacturing it, shown in the 10th figure, an end of flexible pipe 101 is sealed from the outside, the other end of flexible pipe 101 is turned down towards the outside, draw to the direction of arrow C again, reverse thereby make in the table of flexible pipe 101.Another kind method is that the end with flexible pipe 101 seals from the outside shown in the 11st figure, and the inside of this enclosure portion 104 at flexible pipe 101 is pushed to the direction of arrow d, reverses thereby make in the table of flexible pipe 101.After carrying out like this, can make enclosure portion 104 be positioned at bag flexible pipe of shape partial interior 101 and be very easy to and promptly manufacture out.

Secondly, shown in the 8th figure and the 12nd figure, make above-mentioned tubular part 100 and the holding device 120 that template 10 keeps concentric to use, be provided with keeper 121, installed part 122 and assembler 123.Keeper 121 forms circular-arc corresponding to the cylindrical of tubular part 100, installed part 122 is bound up on the top of keeper 121, roughly is the setting of T font, is erected on the opening portion 14 of patrix 11.And installed part 122 relies on a pair of assembler 123 loading and unloading to be installed in freely on the patrix 11.These two assemblers 123 are hung the hook that closes 124, one by one with the edge of the girth member 17 of patrix 11 respectively and are bearing on the installed part 122, can be rotated control stick 126 freely to arrow e, f direction by axle 125, and a tension spring 127 of hanging up between hook 124 and control stick 126 constitutes.And when hanging up tension spring 127, require rotation by control stick 126, make it can bring into play the effect of toggle link.

In addition, dispose several holding devices 120 with certain interval (being 50-80cm in this example) vertically on the top of patrix 11.And the set positions of keeper 121 requires as follows: when tubular part 100 reaches concentric with template 10, keeper is contacted with the cylindrical of this tubular part 100.

According to above-mentioned holding device 120, when control stick 126 was turned to the inside by arrow e direction, hook 124 was hung the edge that is combined in girth member 17 securely by tension spring 127.Thereby holding device 120 accurately and promptly can be assembled on the assigned position of patrix 11.If when control stick 126 is laterally rotated according to arrow f direction, the extension that just can free hook 124 and girth member 17 edges closes.Thereby holding device 120 is promptly thrown off from patrix 11.

And, shown in the 2nd figure and the 8th figure, be provided with the tension equipment 60 of above-mentioned prestressed concrete reinforcing steel 4 usefulness of tension in the end of template 10.The not shown other end also is same.Tension equipment 60 is made of a plectane 61, a screw shaft 62 of inserting logical this plectane 61, a nut 63 and a hexagonal steel bar buck plate 64 that is fixed on screw shaft 62 ends that meshes with screw shaft 62.Reinforcing bar buck plate 64 is inserted within the

template

10, and 62 of screw shafts are from break-through between the

end plates

19,29.

Below, with reference to the 8th figure and the 12nd figure, the method for making concrete-pile of above-mentioned producing device is described.

At first, by the state of above-mentioned die sinking, many prestressed concrete reinforcing steels 4 of installing on reinforcing bar buck plate 64, slotting in advance the leading in prestressing force of hexagonal plate 65 that will be used to form stake 1 end face again mixes on the native reinforcing bar 4, is configured within the counterdie 12.According to the difference of the set positions of this piece hexagonal plate 65, with just can the be shaped multiple stake 1 of long 4-10 rice of a template 10.Then, tubular part 100 is inserted within the counterdie 12.By after the above-mentioned method mold closing,, apply the pulling force of regulation by nut 63,

screw shaft

62 and 64 pairs of reinforcing bars 4 of reinforcing bar buck plate with plectane 61 tensions that tension machine (without diagram) will be strained equipment 60.At this moment, tubular part 100 rests under the state above the prestressed concrete reinforcing steel 4, flat crouching in the bottom of counterdie 12.

Secondly, the water in the water tank 111 is forced into for example 2Kg/cm with pump 110 ², inject in the above-mentioned tubular part 100.After the water of pressurization was injected within the tubular part 100, tubular part 100 just produced and is radially expanded, and in the present embodiment, external diameter is about 163 millimeters.In this stage, tubular part 100 also in the accumbency of the bottom of counterdie 12 again.Like this, be core with the tubular part 100 that is under the caliber enlarging state, cast concrete 71 between template 10 and tubular part 100.

, when pouring into a mould above-mentioned concrete seven 1, template 10 is applied vibration here, just in concrete seven 1, float at concrete compacted by jolting 71 back tubular parts 100 with vibrator (without diagram).This be since the proportion of the proportion of concrete seven 1 (approximately 1.80-2.45) and tubular part 100 and pressure (hydraulic) water 70 (because major part is a water, so can think it approximately is 1) between poor, make tubular part 100 because of be subjected to concrete seven 1 float the effect be picked up.

Shang Fu tubular part 100 like this contacts with the keeper 121 of holding device 120 on being installed in patrix 11 in advance, thereby pushes down the tubular part 100 of come-up, makes itself and template 10 correctly keep concentric.It is corresponding circular-arc to be formed the cylindrical with tubular part 100 because of keeper 121 again, so tubular part 100 unlikely lateral shifts.Continue cast concrete 71 in this state.

Secondly, behind concrete seven 1 casting complete, just lay down holding device 120, from concrete, extract keeper 121 from patrix 11.The space of extracting keeper and producing is full of by concrete seven 1.Owing to extract keeper 121, tubular part 100 has the trend of come-up, but because of the flow resistance of concrete seven 1 is big, so can prevent come-up.Therefore tubular part 100 can keep concentric with template 10, makes concrete seven 1 sclerosis in this state.After concrete seven 1 sclerosis,, tubular part 100 forms required hollow parts 3 owing to making the core of stake 1.

Here, finish concrete cast after, as promptly not taking off holding device 120 from patrix 11 in reasonable time, it is damaged that inside not only can take place stake 1 in, and keeper 121 also might pull out to come out.But lay down many holding devices 120 and but need a large amount of labours and man-hour.Yet,, as mentioned above,, therefore, in reasonable time, just can promptly remove a large amount of holding device 120 with a spot of labour as long as rotate the installation and removal that control stick 126 just can be finished holding device 120 simply according to present embodiment.Again because of holding device 120 can be installed on patrix 11 simply, so also can carry out the preparation of next process early.

Next step, treat concrete seven 1 sclerosis, when reaching the intensity (after about 4 hours) that to bear the careful operation degree, open valve 108 and 114, make the pressure in the tubular part 100 be returned to atmospheric pressure, so tubular part 100 produces radial contraction by the elasticity of itself, reduced diameter also returns to 160 millimeters.Then, concrete seven 1 hardens after (after about 8 hours) fully, carries out die sinking as previously mentioned, cuts off prestressed concrete reinforcing steel at the end face of stake 1, takes out stake 1 in counterdie 12.Then, from hollow parts 3, pull out tubular part 100 towards direction shown in the 8th figure arrow g.

According to above-mentioned method for production, tubular part 100 is owing to inject pressure (hydraulic) water and produce and be radially expanded, and becomes firm core, thereby the inner surface of formed hollow parts 3 is dead smooths, and the size of this hollow parts 3 is very accurately.Like this, tubular part 100 just can correctly keep concentric with template 10 by holding device 120, so the concentricity of hollow parts 3 is high.Therefore, it is that the free-standing that utilizes the difference of proportion to produce buoyancy keeps that tubular part 100 relies on the maintenance of holding device 120, and tubular part 100 is to produce radial contraction by pressing in removing.Thereby, can extract tubular part 100 easily from hollow parts 3.

In addition, when the above-mentioned stake of taking-up was cut off prestressed concrete reinforcing steel 4 at 1 o'clock, need unclamp the nut 63 of pre-tensioning equipment 60.But prestressed concrete reinforcing steel 4 relies on tensioning equipment 60 to be subjected to powerful stretch-draw, so be not easy to make nut 63 revolutions.Usually, the spanner of growing up that use handle to reach 2 meters is operated by two people, and this operation is pretty troublesome.

Therefore, in the present embodiment, shown in the 13rd figure, prepared the disk-like member 66 of rotating screw cap 63 usefulness.At the center of this disk-like member 66, form a cap hole 67 chimeric with nut 63, on its cylindrical, be provided with dentation groove 68.And cable wire 69 is wrapped in the dentation groove when making screw cap hole 67 and nut 63 chimeric, the lift that uses when utilizing die sinking and mold closing upwards draws this cable wire 69, and disk-like member 66 is rotated to arrow h direction.Therefore, do not using under the situations such as specific purpose tool, the lift that utilizes die sinking and mold closing to use just can make nut 63 rotate very simply with big revolving force and unscrew.

More than set forth embodiments of the invention, but the invention is not restricted to present embodiment,, can make various effective distortion according to technological thought of the present invention.

For example, can adopt various materials to make tubular part, get final product so long as under the effect of interior pressure, can radially produce the material of elasticity breathing.

Again in the present embodiment, make water, but, also can make water suitable fluid (for example, air, wet goods) in addition as long as specific gravity, can make the tubular part come-up less than concrete as the fluid that injects.

Claims

1, a kind of preparation method of prefabricated hollow concrete stake comprises:

To have the tubular part that elasticity can breathing inserts in the horizontally disposed template;

Fluid is pressed in the above-mentioned tubular part, under the state that this tubular part is radially expanded, concrete is poured into a mould between above-mentioned template and tubular part;

Push down the buoyancy function that produces by the difference of concrete proportion and the above-mentioned tubular part that floats with holding device, also make this tubular part keep concentric simultaneously with respect to above-mentioned template;

After finishing concrete cast, lay down above-mentioned holding device;

Concrete curing, and after forming hollow parts by above-mentioned tubular part, remove the interior pressure of above-mentioned tubular part, make this tubular part generation radial contraction after, this tubular part is extracted from above-mentioned hollow parts.

2, a kind of producing device of prefabricated hollow concrete stake has:

Tubular part, having elasticity can breathing, can insert in the horizontally disposed template, by being pressed into fluid to its inside it is radially expanded, and pressure then makes its radial contraction in removing;

Holding device is used for cast concrete between above-mentioned template and above-mentioned tubular part, when producing buoyancy because of the difference of concrete proportion, pushes down the tubular part because of floated by buoyancy, and makes this tubular part keep concentric with respect to above-mentioned template.

3, the producing device of prefabricated hollow concrete stake according to claim 2 is characterized in that:

Above-mentioned holding device has, with the corresponding circular-arc keeper of above-mentioned tubular part cylindrical, be erected at opening part above the above-mentioned template installed part, can make above-mentioned installed part on template, load and unload freely assembler;

Above-mentioned assembler system by and above-mentioned template hang the hook that closes, rotate freely that the earth's axis is bearing in the control stick on the above-mentioned assembly, the tension spring of hanging up between above-mentioned hook and above-mentioned control stick constitutes.

4, the producing device of prefabricated hollow concrete stake according to claim 2, it is characterized in that: above-mentioned template is made of upper die and lower die, side at the die joint of these upper die and lower die is provided with the pin hinge, cuts with scissors patrix constituted with respect to counterdie by this pin and rotates freely.

5, the producing device of prefabricated hollow concrete stake according to claim 4, it is characterized in that: be provided with first retainer and second retainer, first retainer can make patrix stop operating going under the die opening state of upright position, and second retainer is used to prevent that the patrix of die sinking from rotating to the mold closing direction.