CN106514861A - Composite reinforcing bar reinforcement cage prestressed tensioning device and method for manufacturing prestressed square-sectioned pile - Google Patents
Composite reinforcing bar reinforcement cage prestressed tensioning device and method for manufacturing prestressed square-sectioned pile Download PDFInfo
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 126
- 239000002131 composite material Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 title abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 180
- 239000010959 steel Substances 0.000 claims abstract description 180
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 239000011513 prestressed concrete Substances 0.000 claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims description 12
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 230000008569 process Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011150 reinforced concrete Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/12—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed to form prestressed circumferential reinforcements
- B28B23/16—Prestressed reinforcing nets
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/16—Shapes
- E02D2200/1628—Shapes rectangular
- E02D2200/1635—Shapes rectangular made from single element
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
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Abstract
The invention discloses a composite reinforcing bar reinforcement cage prestressed tensioning device. The device comprises a steel strand initial stress applying mechanism arranged at the cage tail side of a composite reinforcing bar reinforcement cage and a steel strand tensioning mechanism arranged at the cage head side of the composite reinforcing bar reinforcement cage. The invention further discloses a method for manufacturing a prestressed concrete square-sectioned pile. The method includes the following steps that the composite reinforcing bar reinforcement cage is installed on a mold; prestressed steel strands are tensioned by the adoption of the composite reinforcing bar reinforcement cage prestressed tensioning device, concrete is prepared to be poured into the mold, and vibrating and tamping are further performed; natural curing or steam curing is adopted; and when the concrete reaches specified strength, the prestressed steel strands are stretched, and the prestressed steel strands at the stretched positions are treated. The prestressed tensioning device disclosed by the invention is adopted for tensioning the prestressed steel strands of the reinforcement cage, all the steel strands can obtain uniform tensioning stress, precision is high, and operation is convenient and easy to implement.
Description
Technical Field
The invention belongs to the technical field of concrete square piles, and particularly relates to a composite reinforcement cage prestress tensioning device and a manufacturing method of a prestress square pile.
Background
The prefabricated reinforced concrete square pile is an important pile foundation material in civil construction basic engineering in China and is a concrete product with larger yield in prefabricated components in China. The prefabricated reinforced concrete square pile product has the following characteristics: the pile body concrete strength is high, and the single pile body bearing capacity is high; the construction is less influenced by the change of underground water; the manufacturing is convenient, and the prefabricated steel plate can be prefabricated on site and can also be produced in a factory; piles of various specifications and lengths can be produced according to different geological conditions; the pile body has reliable quality, and the construction quality is easier to ensure than that of a cast-in-place pile; the construction speed is high, the investment scale of the production line construction is small, and the like. In recent years, with the development of the building industry in China, the product is vigorously developed in many areas in China.
The steel reinforcement cage is as the component of prefabricated reinforced concrete square pile, and its constitution, quality and structural strength etc. directly influence the quality of prefabricated reinforced concrete square pile. Most of prestressed concrete square piles applied to the market at present are centrifugally formed hollow piles, steel bars for prestressed concrete are used as main reinforcements, and the prestressed concrete square piles are widely applied to the field of buildings in a large quantity due to the advantages of high production efficiency, relatively high strength of the main reinforcements, high strength of concrete, relatively fast period and the like, are continuously used till now and play an important role in the conventional pile foundation at present. However, the prestressed concrete hollow pile with the main reinforcement made of the steel bar has more problems in the production and use processes. In order to facilitate tensioning in production, a steel bar hot pier head technology is needed, the pier head, the pile body end plate and the tensioning plate are clamped for prestress tensioning, the strength of the steel bar is damaged and the material is damaged due to hot pier of the steel bar, and meanwhile, the steel bar cannot be fully contacted with the end plate during tensioning due to inconsistent accuracy of the steel bar pier head, so that the end plate is locally damaged; the steel bar is not enough in cutting accuracy control, so that the length of the steel bar is different, and the phenomenon of uneven stress and even breaking can occur in the tensioning process. In addition, the production process needs procedures such as centrifugal molding, high-temperature steam curing and the like, so that the process is complicated. The prestressed concrete hollow pile has good mechanical property, but the steel bar has high brittleness, so that the integral brittleness is obvious, the bending resistance and the shearing resistance are insufficient, the escape and rescue time is relatively short when a disaster happens, and the personnel escape is not facilitated.
The prestressed steel strand has the characteristics of high strength and good relaxation performance, so that the prestressed steel strand is widely applied to bridges, buildings, water conservancy, energy, geotechnical engineering and the like. In recent years, China has made a great deal of research on application of steel strands to prestressed concrete piles, but most of the steel strands are only a technical concept, and no technical scheme with practical value is formed. Compared with a prestressed steel bar for concrete, the prestressed steel strand used as the prestressed main reinforcement of the precast pile has the advantages of high strength and good ductility, but in practical application, the prestressed steel strand has the outstanding problems that: firstly, the steel strand is formed by twisting a plurality of steel wires, so that the steel strand is not easy to weld and wind, and a steel reinforcement cage formed by the steel reinforcement cage of the precast pile is not easy to manufacture; and secondly, although the process of prestress tensioning of the steel strand is mature in the aspects of bridges and the like, the process is not researched a lot when the process is applied to precast piles, and mainly relates to each process flow of how to anchor, tension, release and post-release end treatment of the steel strand and the like.
Therefore, how to realize the prestress tensioning of each reinforcing bar for the reinforcement cage in the form of the composite reinforcing bar becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention provides a composite reinforcement cage prestress tensioning device and a manufacturing method of a prestress square pile, aiming at overcoming the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a composite reinforcement cage prestress tensioning device is characterized in that the cross section of the composite reinforcement cage is square, the composite reinforcement cage comprises 4M prestress main reinforcements, M is an integer larger than or equal to 1, each prestress main reinforcement is a prestress stranded wire, and each prestress stranded wire is uniformly distributed on four sides of the square composite reinforcement cage; the prestress tensioning device comprises a steel strand primary stress applying mechanism arranged on one side of the cage tail of the composite reinforcement cage and a steel strand tensioning mechanism arranged on one side of the cage head of the composite reinforcement cage; the steel strand primary stress applying mechanism comprises a first end box and first finish-rolled deformed steel bars which are arranged on the first end box, the number of the first finish-rolled deformed steel bars is equal to that of the prestressed steel strands, the positions of the first finish-rolled deformed steel bars are opposite to that of the prestressed steel strands, one end of each first finish-rolled deformed steel bar is positioned on the first end box through a first finish-rolled deformed steel bar nut, and the other end of each first finish-rolled deformed steel bar is connected with the corresponding prestressed steel strand through a first finish-rolled deformed steel bar connector; the steel strand stretching mechanism comprises a stretching plate, second finish-rolling deformed steel bars which are equal to the prestressed steel strands in number and are opposite in position are arranged on the stretching plate, one ends of the second finish-rolling deformed steel bars are located on the stretching plate through second finish-rolling deformed steel bar nuts, the other ends of the second finish-rolling deformed steel bars are connected with the corresponding prestressed steel strands through second finish-rolling deformed steel bar connectors, and the steel strand stretching mechanism further comprises a driving portion which drives the stretching plate to move axially along the composite reinforcing steel bar cage.
The driving part comprises a second end box, a lead screw and an electric hydraulic jack, the lead screw penetrates through the second end box, the electric hydraulic jack is arranged on one side of the second end box and used for driving the lead screw, the tensioning plate is located between the second end box and a cage head of the composite reinforcement cage, the lead screw penetrates through the second end box and then is connected with the tensioning plate, and a dial plate is arranged on the electric hydraulic jack.
The steel strand stretching mechanism further comprises a conveying trolley, and the second end box and the electric hydraulic jack are both arranged on the conveying trolley.
One side of the first end box is provided with a backing plate.
The composite reinforcement cage further comprises stirrups and 4N non-prestressed main reinforcements, wherein N is an integer greater than or equal to 1, four non-prestressed main reinforcements are respectively arranged at four corners of the square composite reinforcement cage, the rest non-prestressed main reinforcements are uniformly distributed on four edges of the square composite reinforcement cage, and the stirrups are spirally distributed on the peripheral peripheries of the non-prestressed main reinforcements and the prestressed steel strands.
The non-prestressed main reinforcement is HRB400 steel reinforcement, and the stirrup is a cold-drawn low-carbon steel wire or a low-carbon steel hot-rolled disc strip.
The invention also discloses a manufacturing method of the prestressed concrete square pile, which comprises the following steps:
step 1, preparing a mould, coating a release agent on the mould, and installing the composite reinforcement cage on the mould;
step 2, tensioning the prestressed steel strands by using the composite reinforcement cage prestress tensioning device, wherein during tensioning, a first finish-rolled threaded steel nut is firstly screwed by a torque wrench to apply initial stress to each prestressed steel strand, the initial stress of each prestressed steel strand is ensured to be on the same numerical value, after the initial stress is applied, an electric hydraulic jack is used for driving a screw rod to move, a tensioning plate is further driven to move along the axial direction of the composite reinforcement cage, and each prestressed steel strand is tensioned to the same data through dial reading of the electric hydraulic jack;
step 3, preparing concrete, pouring the concrete into a mold, and vibrating and tamping the concrete;
step 4, adopting natural curing or steam curing;
and 5, when the concrete reaches the specified strength, releasing the prestressed steel strand, treating the prestressed steel strand at the releasing position, plugging the exposed position of the prestressed steel strand at the pile end by using the concrete with the same strength as the pile body, and plugging the exposed position of the prestressed steel strand at the pile tip by using epoxy resin.
A set of mould makes many prestressed concrete square piles simultaneously, and the steel reinforcement cage of many square piles is put into the mould in proper order, every square pile correspond the configuration one set as above compound arrangement of reinforcement cage prestressing force tensioning equipment, the prestressing force owner muscle of the same position of section of many square piles links to each other into a whole, carries out the stretch-draw simultaneously.
Be provided with a plurality of minutes moulds in one set of mould, the steel reinforcement cage of many square piles is put into in proper order and is divided the mould, and cage tail one side of the steel reinforcement cage of every square pile is equipped with one set as above steel strand wires just add stress application mechanism, many square piles share one set as above steel strand wires stretch-draw mechanism, the rail that supplies the transport dolly walking has been laid to one side of mould, the mould has many sets, and many sets of moulds are arranged in proper order along the rail direction.
When the reinforcement cages in the submolds of the same set of die are tensioned, the reinforcement cage in the middle of the die is firstly tensioned, and then the reinforcement cages on the two sides of the middle are tensioned.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the steel reinforcement framework of the prestressed concrete square pile adopts a steel reinforcement cage in a non-prestressed main reinforcement and prestressed steel strand composite reinforcement form, and the steel reinforcement cage has good deformation performance, high tensile strength and excellent mechanical property; specifically, under the action of failure, the non-prestressed main reinforcement can effectively delay the longitudinal development of failure cracks, control the width of the cracks and increase the number of the cracks so as to release stress, and compared with a prestressed steel bar, the prestressed steel strand has good ductility and better deformability.
2. The prestress tension device of the invention is used for tensioning the prestress steel strands of the steel reinforcement cage, so that the steel strands can obtain uniform tension stress, the precision is high, the operation is simple and easy, and the strength and the toughness of the steel strands and the manufacturing precision of the steel reinforcement cage are ensured.
3. The prestressed concrete square pile manufactured by the manufacturing method is time-saving and labor-saving, and the production efficiency is improved.
Drawings
Fig. 1 is a partial structural schematic view of the composite reinforcement cage prestress tensioning device in the invention.
Fig. 2 is a schematic view of a reinforcing bar structure of the prestressed concrete square pile according to the present invention.
Fig. 3 is a structural diagram of a reinforcing bar form of the composite reinforcing bar cage of the invention.
Fig. 4 is a structural diagram of a reinforcing form of the composite reinforcing cage of the invention.
Fig. 5 is a structural diagram of a reinforcing form of the composite reinforcing cage of the present invention.
Fig. 6 is a structural diagram of a reinforcing form of the composite reinforcing cage of the present invention.
Wherein,
1. the first finish-rolled deformed steel bar 2, the first finish-rolled deformed steel bar nut 3, the backing plate 4, the first end box 5, the first finish-rolled deformed steel bar connector 6, the prestressed steel strand 7, the second finish-rolled deformed steel bar connector 8, the second finish-rolled deformed steel bar 9, the tension plate 10, the second finish-rolled deformed steel bar nut 11, the second end box 12, the lead screw 13, the non-prestressed main bar 14, and the stirrup
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited to these examples.
As shown in fig. 1 and 2, a cross section of the composite reinforcement cage is square, the composite reinforcement cage comprises stirrups 14, 4N non-prestressed main reinforcements 13 and 4M prestressed main reinforcements, M and N are integers greater than or equal to 1, the stirrups 14 are cold-drawn low-carbon steel wires or low-carbon steel hot-rolled circular strips, each non-prestressed main reinforcement 13 is an HRB400 reinforcement, each prestressed main reinforcement is a prestressed stranded wire 6, each prestressed stranded wire 6 is uniformly distributed on four sides of the square composite reinforcement cage, and the stirrups 14 are spirally distributed on the peripheral peripheries of the non-prestressed main reinforcements 13 and the prestressed stranded wires 6.
Specifically, the reinforcing form of the composite reinforcing steel bar cage in the invention can be four non-prestressed main reinforcements 13 and four prestressed steel strands 6 as shown in fig. 3, wherein the four non-prestressed main reinforcements 13 are respectively located on four sides of the square composite reinforcing steel bar cage, and the four prestressed steel strands 6 are respectively located on four sides of the square composite reinforcing steel bar cage; the reinforcement form of the composite reinforcement cage can also be the reinforcement form of four non-prestressed main reinforcements 13 and eight prestressed steel strands as shown in fig. 4, wherein the four non-prestressed main reinforcements 13 are respectively positioned on four sides of the square composite reinforcement cage, and the eight prestressed steel strands 6 are respectively positioned on four sides of the square composite reinforcement cage; the reinforcement form of the composite reinforcement cage can also be the reinforcement form of eight non-prestressed main reinforcements 13 and eight prestressed steel strands 6 as shown in fig. 5, wherein four non-prestressed main reinforcements are respectively positioned on four sides of the square composite reinforcement cage, the other four non-prestressed main reinforcements 13 are respectively arranged in the middle of the four sides of the quadrilateral composite reinforcement cage, and the eight prestressed steel strands 6 are respectively and uniformly distributed on the four sides of the quadrilateral composite reinforcement cage; the reinforcement form of the composite reinforcement cage can also be the reinforcement form of eight non-prestressed main reinforcements 13 and sixteen prestressed steel strands 6 as shown in fig. 6, wherein four non-prestressed main reinforcements 13 of the eight non-prestressed main reinforcements 13 are arranged at four corners of the quadrilateral composite reinforcement cage, the other four non-prestressed main reinforcements 13 are respectively arranged in the middle of four sides of the quadrilateral composite reinforcement cage, and the sixteen prestressed steel strands 6 are respectively uniformly distributed on the four sides of the quadrilateral composite reinforcement cage.
The prestress tensioning device comprises a steel strand primary stress applying mechanism arranged on one side of the cage tail of the composite reinforcement cage and a steel strand tensioning mechanism arranged on one side of the cage head of the composite reinforcement cage; the steel strand primary stress applying mechanism comprises a first end box 4 and first finish-rolled deformed steel bars 1 which are arranged on the first end box 4, the number of the first finish-rolled deformed steel bars 1 is equal to that of the prestressed steel strands 6, the positions of the first finish-rolled deformed steel bars 1 on the first end box 4 are opposite to that of the prestressed steel strands 6, one end of each first finish-rolled deformed steel bar 1 is positioned on the first end box 4 through a first finish-rolled deformed steel bar nut 2, a base plate 3 is arranged on one side, which is in contact with the first finish-rolled deformed steel bar nut 2, of the first end box 4, and the other end of each first finish-rolled deformed steel bar 1 is connected; the steel strand tensioning mechanism comprises a tensioning plate 9, second finish-rolled deformed steel bars 8 which are equal in number and opposite in position to the prestressed steel strands 6 are arranged on the tensioning plate 9, one end of each second finish-rolled deformed steel bar 8 is connected with the corresponding prestressed steel strand 6 through a second finish-rolled deformed steel bar nut 10, the other end of each second finish-rolled deformed steel bar 8 is connected with the corresponding prestressed steel strand 6 through a second finish-rolled deformed steel bar connector 7, the steel strand tensioning mechanism further comprises a driving part for driving the tensioning plate 9 to move axially along the composite reinforcement cage, the driving part comprises a second end box 11, a lead screw 12 crossing the second end box 11 and an electric hydraulic jack which is arranged on one side of the second end box 11 and used for driving the lead screw 12, the tensioning plate 9 is located between the second end box 11 and the cage head of the composite reinforcement cage, the lead screw 12 crosses the second end box 11 and then is connected with the tensioning plate 9, a dial is arranged on the electric hydraulic jack; the steel strand stretching mechanism further comprises a conveying trolley, and the second end box 11 and the electric hydraulic jack are both arranged on the conveying trolley.
It should be noted that the structural form of the driving part for driving the tensioning plate 9 to move axially along the reinforcement cage in the present invention is not limited to the above-mentioned manner of matching the electric hydraulic jack with the lead screw 12, and other manners, such as a manner of driving by using a hydraulic cylinder, may also be adopted to connect the piston rod of the hydraulic cylinder with the tensioning plate 11, as long as the tensioning plate 11 can be driven to move axially along the reinforcement cage to tension the steel strand.
The invention also discloses a manufacturing method of the prestressed concrete square pile, which comprises the following steps:
step 1, preparing a mould, coating a release agent on the mould, and installing the composite reinforcement cage on the mould;
step 2, tensioning the prestressed steel strands 6 by using the composite reinforcement cage prestress tensioning device, wherein during tensioning, a first finish-rolling screw-thread steel nut 2 is firstly screwed by a torque wrench to apply initial stress to each prestressed steel strand 6, the initial stress of each prestressed steel strand 6 is ensured to be on the same numerical value, after the initial stress is applied, an electric hydraulic jack is used for driving a lead screw 12 to move, and then a tensioning plate 9 is driven to move along the axial direction of the composite reinforcement cage, and each prestressed steel strand 6 is tensioned to the same data through dial reading on the electric hydraulic jack;
step 3, preparing concrete, pouring the concrete into a mold, and vibrating and tamping the concrete;
step 4, adopting natural curing or steam curing;
and 5, when the concrete reaches the specified strength, releasing the prestressed steel strand 6, treating the prestressed steel strand 6 at the releasing position, plugging the exposed part of the prestressed steel strand 6 at the pile end by using the concrete with the same strength as the pile body, and plugging the exposed part of the prestressed steel strand 6 at the pile tip by using epoxy resin.
A set of mould makes many prestressed concrete square piles simultaneously, and the steel reinforcement cage of many square piles is put into the mould in proper order, every square pile correspond the configuration one set as above compound arrangement of reinforcement cage prestressing force tensioning equipment, the prestressing force owner muscle of the same position of section of many square piles links to each other into a whole, carries out the stretch-draw simultaneously.
The mould has many sets, and many sets of moulds arrange in proper order, are provided with a plurality of branch moulds in each set of mould, and the steel reinforcement cage of many square piles is put into in proper order and is divided the mould, and cage tail one side of the steel reinforcement cage of every square pile is equipped with one set as above steel strand wires add stress application mechanism just, many square piles share one set as above steel strand wires tensioning mechanism, the rail that supplies the transport dolly walking is laid to one side of mould, when stretching-draw the steel reinforcement cage that lies in each branch mould of same set of mould, preferably, lie in the steel reinforcement cage in the middle of the mould earlier, stretch-draw the steel reinforcement cage that lies in middle both sides again, carry the dolly to drive steel strand wires tensioning mechanism round trip movement.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A composite reinforcement cage prestress tensioning device is characterized by comprising a steel strand primary stress applying mechanism arranged on one side of the cage tail of the composite reinforcement cage and a steel strand tensioning mechanism arranged on one side of the cage head of the composite reinforcement cage; the steel strand primary stress applying mechanism comprises a first end box and first finish-rolled deformed steel bars which are arranged on the first end box, the number of the first finish-rolled deformed steel bars is equal to that of the prestressed steel strands, the positions of the first finish-rolled deformed steel bars are opposite to that of the prestressed steel strands, one end of each first finish-rolled deformed steel bar is positioned on the first end box through a first finish-rolled deformed steel bar nut, and the other end of each first finish-rolled deformed steel bar is connected with the corresponding prestressed steel strand through a first finish-rolled deformed steel bar connector; the steel strand stretching mechanism comprises a stretching plate, second finish-rolling deformed steel bars which are equal to the prestressed steel strands in number and are opposite in position are arranged on the stretching plate, one ends of the second finish-rolling deformed steel bars are located on the stretching plate through second finish-rolling deformed steel bar nuts, the other ends of the second finish-rolling deformed steel bars are connected with the corresponding prestressed steel strands through second finish-rolling deformed steel bar connectors, and the steel strand stretching mechanism further comprises a driving portion which drives the stretching plate to move axially along the composite reinforcing steel bar cage.
2. The pre-stressed tension device of the composite reinforcement cage according to claim 1, wherein the driving part comprises a second end box, a lead screw traversing the second end box, and an electro-hydraulic jack disposed at one side of the second end box and used for driving the lead screw, the tension plate is disposed between the second end box and a head of the composite reinforcement cage, the lead screw traverses the second end box and is connected with the tension plate, and a dial is disposed on the electro-hydraulic jack.
3. The pre-stress tensioning device for the composite reinforcement cage according to claim 2, wherein the strand tensioning mechanism further comprises a conveying trolley, and the second end box and the electro-hydraulic jack are arranged on the conveying trolley.
4. The pre-stressed tension device of the composite reinforcement cage according to claim 1, wherein a backing plate is disposed on one side of the first end box.
5. The pre-stressed tensioning device for the composite reinforced steel bar cage according to claim 1, wherein the composite reinforced steel bar cage further comprises stirrups and 4N non-pre-stressed main bars, N is an integer greater than or equal to 1, wherein four non-pre-stressed main bars are respectively arranged at four corners of the square composite reinforced steel bar cage, the rest non-pre-stressed main bars are uniformly distributed on four sides of the square composite reinforced steel bar cage, and the stirrups are spirally distributed on the peripheral circumferences of the non-pre-stressed main bars and the pre-stressed steel strands.
6. The pre-stressed tensioning device for the composite reinforcement cage according to claim 5, wherein the non-prestressed main bars are HRB400 steel bars, and the stirrups are cold-drawn low-carbon steel wires or low-carbon steel hot-rolled disc strips.
7. A method for manufacturing a prestressed concrete square pile comprises the following steps:
step 1, preparing a mould, coating a release agent on the mould, and installing the composite reinforcement cage on the mould;
step 2, tensioning the prestressed steel strands by using the prestressed tensioning device of the composite reinforcement cage according to claims 3 to 6, wherein during tensioning, a first finish-rolling screw-thread steel nut is firstly screwed by a torque wrench to apply initial stress to each prestressed steel strand, and simultaneously the initial stress of each prestressed steel strand is ensured to be on the same numerical value;
step 3, preparing concrete, pouring the concrete into a mold, and vibrating and tamping the concrete;
step 4, adopting natural curing or steam curing;
and 5, when the concrete reaches the specified strength, releasing the prestressed steel strand, treating the prestressed steel strand at the releasing position, plugging the exposed position of the prestressed steel strand at the pile end by using the concrete with the same strength as the pile body, and plugging the exposed position of the prestressed steel strand at the pile tip by using epoxy resin.
8. The method as claimed in claim 7, wherein a set of mold is used to simultaneously form a plurality of square piles, the reinforcement cages of the plurality of square piles are sequentially placed in the mold, each square pile is correspondingly provided with a set of the above-mentioned composite reinforcement cage prestress tensioning device, and the main prestress reinforcements at the same positions of the cross sections of the plurality of square piles are connected into a whole and tensioned simultaneously.
9. The method for manufacturing the prestressed concrete square pile according to claim 7, wherein a plurality of split molds are arranged in one set of the mold, the steel reinforcement cages of a plurality of square piles are sequentially placed into the split molds, one side of the cage tail of the steel reinforcement cage of each square pile is provided with the steel strand initial stress applying mechanism, the plurality of square piles share the steel strand tensioning mechanism, one side of the mold is paved with a rail for the conveying trolley to travel, and the plurality of sets of the mold are sequentially arranged along the direction of the rail.
10. The method of claim 9, wherein the reinforcement cages in the sub-molds of the same set of molds are tensioned, and the reinforcement cages in the middle of the molds are tensioned first, and then the reinforcement cages on both sides of the middle are tensioned.
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