CN112248220A - Method for manufacturing steel mould of pre-tensioned prestressed concrete prefabricated screw pile - Google Patents
Method for manufacturing steel mould of pre-tensioned prestressed concrete prefabricated screw pile Download PDFInfo
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- CN112248220A CN112248220A CN202011106766.XA CN202011106766A CN112248220A CN 112248220 A CN112248220 A CN 112248220A CN 202011106766 A CN202011106766 A CN 202011106766A CN 112248220 A CN112248220 A CN 112248220A
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- screw pile
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F11/00—Cutting wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
- B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
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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
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/38—Treating surfaces of moulds, cores, or mandrels to prevent sticking
Abstract
The invention discloses a method for manufacturing a steel mould of a pretensioning prestressed concrete prefabricated screw pile, which comprises a reinforcing steel bar, it is characterized in that the devices needed in the method for manufacturing the steel mould of the prefabricated screw pile comprise a reinforcing steel bar fastening device, a net distributing device and a tension auxiliary device, firstly, a reinforcing steel bar pile head is welded and installed at one end of a reinforcing steel bar, the diameter of the tail end of the reinforced pile head is larger than that of the tail end of the reinforced steel bar, the reinforced steel bar fastening device comprises a spiral pile cap, the spiral pile cap is sleeved outside the reinforced pile head, a plurality of limiting holes are uniformly arranged inside the spiral pile cap, one end of the limiting hole is consistent with the size of the steel bar pile head, the other end of the limiting hole is consistent with the size of the steel bar, the spiral pile cap has the advantages that the labor intensity is reduced, and the spiral pile cap can be used in extreme terrains.
Description
Technical Field
The invention relates to the technical field of spiral pile manufacturing, in particular to a method for manufacturing a steel mould of a pretensioning prestressed concrete prefabricated spiral pile.
Background
With the development of high efficiency, low cost and civilized environmental protection of pile foundation engineering construction, new concrete precast pile forms and pile forming methods are continuously appeared in recent years. For example, static pressure pipe piles, static pressure square piles and the like become the preferred pile types for the current pile foundation construction and the pile types which are widely popularized. At present, a new concrete prefabricated screw pile has been patented. The pile form and the pile forming method have the characteristics of high construction efficiency, large bearing capacity, no pollution, no noise and the like. But can not be popularized and applied in time due to the problem of steel die manufacturing.
The existing method for manufacturing the steel mould of the pretensioning prestressed concrete prefabricated screw pile needs a large amount of manpower and is poor in practicability; meanwhile, the finished product of the steel mould manufacturing method of the pre-tensioned pre-stressed concrete prefabricated screw pile cannot be suitable for the extreme terrains such as the junction of desertification land and the like, and the steel mould needs to be redesigned according to the terrains. Therefore, it is necessary to design a method for manufacturing a steel mold of a pre-tensioned pre-stressed concrete prefabricated screw pile which reduces the labor and can be used in various extreme terrains.
Disclosure of Invention
The invention aims to provide a method for manufacturing a steel mould of a pretensioning prestressed concrete prefabricated screw pile, which aims to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a method for manufacturing a steel mould of a pretensioning prestressed concrete prefabricated screw pile comprises a steel bar, and is characterized in that: the device required in the method for manufacturing the steel mould of the prefabricated screw pile comprises a steel bar fastening device, a net distributing device and a tensioning auxiliary device.
According to the technical scheme, the method comprises the following steps:
A. installing a steel bar pile head and a spiral pile cap at one end of a steel bar;
B. inserting the steel bars into the steel bar framework device;
C. laying a net on the outer side of the steel bar, welding iron wires on the outer side of the steel bar by using a net laying device, performing spot welding and cutting on the iron wires, cutting one iron wire by a cutting machine in a quarter circle along with a spot welding machine, cutting two iron wires in a quarter circle, cutting three iron wires in a quarter circle, and completely cutting four iron wires in the last quarter circle;
D. tensioning prestress is carried out on the steel bars by using a tensioning auxiliary device;
E. placing the steel bar framework into a mould, pouring cement, stirring, solidifying and forming;
F. heating the screw pile;
G. rotationally curing the formed spiral pile by using steam;
H. and detecting the final finished product.
According to the technical scheme, in the step A, firstly, the reinforced pile head is welded and installed at one end of the steel bar, the diameter of the tail end of the reinforced pile head is larger than that of the tail end of the reinforced steel bar, the reinforced steel bar fastening device comprises a spiral pile cap, the spiral pile cap is sleeved outside the reinforced pile head, a plurality of limiting holes are uniformly arranged inside the spiral pile cap, one end of the limiting hole is consistent with the size of the steel bar pile head, the other end of the limiting hole is consistent with the size of the steel bar, the screw pile cap is internally provided with a bearing, the upper layer is a rotatable layer, after the reinforcing steel bar pile head is welded at the tail end of the reinforcing steel bar, the reinforcing steel bar pile head penetrates through one end of the limiting hole, the upper rotating layer of the spiral pile cap is rotated, and the reinforcing steel bar pile head is clamped into the other end of the limiting hole to be limited and fixed.
According to the technical scheme, the steel bar framework device in the step B comprises six steel bar reserved openings, the six steel bars are respectively inserted into the steel bar reserved openings, connecting rods are evenly welded and installed between two opposite steel bars at intervals of 20CM, compared with the prior method that four steel bars are used as a spiral pile support, the method uses six steel bars, the connecting rods are welded between the opposite steel bars, the steel bar framework structure is more stable, and the welding connecting rods at the intervals of 20CM are used for enabling subsequent cement pouring and solidification to be more compact.
According to the technical scheme, the net distributing device in the step C is annular, a plurality of partition plates are uniformly arranged inside the net distributing device, iron wires are arranged between the partition plates, a driver, a spot welding machine and a cutter are arranged behind the net distributing device, the cutter comprises a plurality of sections of extending devices, the driver is positioned between the spot welding machine and the cutter, and four cutting knives are arranged in the cutter;
if the outer circumference of the steel bar framework is R, when the driver drives the net distribution device to rotate R/6, the spot welding machine rotates 60 degrees along with the net distribution device for the first time to weld the iron wires for three times, rotates 60 degrees along with the net distribution device for the second time, welds the iron wires for two times by the spot welding machine, rotates 60 degrees along with the net distribution device for the third time, welds the iron wires for one time by the spot welding machine, rotates 60 degrees along with the net distribution device for the fourth time, the spot welding machine does not weld the iron wires, four cutting pieces in the cutting machine are linked with the rotating shaft, when the spot welding machine welds for three times, a plurality of sections of the extending devices extend out of the first cutting piece to fall to cut one iron wire, when the electric welding machine welds twice, the first cutting piece and the second cutting piece of the cutting machine fall to cut two iron wires, the operation is repeated, compared with the existing method that the iron wires are wound and welded on the outer sides of the steel, the manpower consumption that has greatly reduced, when the screw pile is in the use, receive weather effect, can expand when being heated, can contract when meeting cold. This is because particle (atom) motion in the screw pile can change along with the temperature, when the temperature rose, the vibration range of particle increases, make inside set cement and the reinforcing bar expansion of screw pile, but when the temperature declined, the vibration range of particle just can reduce, make its shrink, for example need set up the screw pile in juncture when renovating desertification soil, probably face both sides sand and soil and have different specific heat capacity this moment, according to the difference of soil heat absorption effect, select the different one side in iron wire gap and install, if on the one side that all is cut four iron wires corresponds the heat absorption and teach many land, when the screw pile meets hot temperature higher, then have more gaps to satisfy the needs of thermal energy, avoid the screw pile to damage, make the application range of screw pile wider, need not to make again according to the topography.
According to the technical scheme, stretch-draw auxiliary device includes main shaft hole, holder in the step D, the inside of holder is connected with spacing latch through the bearing, the below of spacing latch is provided with multisection fixture block, the top of spacing latch is provided with the pulling force rope, the other end winding of pulling force rope passes inside the holder with the reinforcing bar on the main shaft, starts the jack, and the holder is cliied the reinforcing bar and is carried out the tensioning prestressing force to the reinforcing bar, when needs carry out the stretch-draw to the reinforcing bar, at first cup joints the stretch-draw auxiliary device in the reinforcing bar outside, rotates the stretch-draw auxiliary device, and the inside spacing latch card of holder is gone into and is fastened the centre gripping to the reinforcing bar in the draw-in groove of multisection fixture block, relies on the jack simply to stretch-draw in comparing in current method, has avoided reinforcing.
According to the technical scheme, when cement is poured into the spiral pile in the step E, a layer of non-adhesive glue is firstly brushed in the spiral pile template, the tensioned steel reinforcement framework is placed into the template, cement is poured into the template by using the automatic cement pouring machine, the motor is started simultaneously, so that the main shaft rotates in the steel reinforcement framework in a grading manner at the main shaft rotating speed from low normal speed to medium speed to high speed for 50 minutes, the non-adhesive glue is brushed in the template, the spiral pile is ensured not to be adhered with the template in the manufacturing process, the demolding process is simpler and more convenient, compared with the prior art, the automatic cement pouring machine fills cement into the template manually by manpower, the manpower consumption is reduced, the working efficiency is improved, the cement rotates from low normal speed to high speed for 50 minutes, the cement is stirred and rotated in the template fully, and no air bubbles are generated in the interior after the cement is solidified, ensuring the production quality.
According to the technical scheme, the screw pile formed by solidification is kept stand for 1 h-2 h in the step F, then the screw pile is kept at a constant temperature of 20 ℃ to 25 ℃ for maintaining h, then the temperature outside the screw pile is heated to 70 +/-5 ℃, finally natural cooling is carried out, and when the cement solidification temperature is stable, the cement is heated to 70 ℃, so that the cement in the screw pile is better matched with the tensioning prestress of the reinforcing steel bars, and the bending resistance of the screw pile finished product is improved.
According to the technical scheme, when the screw pile formed in the step G is cured by using steam, the selected steam device is of a double-layer structure, the pressure of the inner layer of the steam device is adjusted to 0.9-1.0 MPa, the temperature is about 180 ℃, the poured concrete component is cured in saturated steam with the relative humidity of more than 90% and the temperature of more than 60 ℃ under the conditions of 0.9-1.0 MPa, the steam pipe is laid in an empty longitudinal mode, the steam device is of an inner-layer structure and an outer-layer structure, the inner layer of the steam device is provided with a curing detection device, the curing detection device comprises a clamp holder, a rubber pad is arranged on the inner side of the clamp holder, a driving device is arranged above the rubber pad and connected with a high-temperature evaporator, the front end and the rear end of the steam curing device are respectively provided with an exhaust fan and an exhaust hole, the exhaust fan blows hot steam from one end of the screw pile to the other end to ensure that, the outer layer circulation that used steam got into steam device through the exhaust hole gets into high temperature evaporator, heat up, blow by the air discharge fan again and carry out the heat maintenance to screw device, high temperature evaporator is two sets of at least, set up respectively at the front and back end of steam device, the holder contacts with the screw pile, repeatedly back-and-forth movement outside the screw pile, when the rubber pad slides to the region for the maintenance completion, the rubber pad is compressed and starts drive arrangement, drive arrangement leads to high temperature steam alone this region to carry out the steam maintenance, compare in current method, this step has been realized avoiding producing local high temperature when the even maintenance of screw pile and has caused excessive maintenance.
According to the technical scheme, the final finished product is demoulded in the step H, and the bending resistance, the strength, the bent pipe quality and the size of the finished product are measured.
Compared with the prior art, the invention has the following beneficial effects: in the invention, the raw materials are mixed,
(1) by arranging the reinforcing steel bar pile head and the spiral pile head, after the reinforcing steel bar pile head is welded at the tail end of the reinforcing steel bar, the reinforcing steel bar pile head penetrates through one end of the limiting hole, the upper rotating layer of the spiral pile head is rotated, and the reinforcing steel bar pile head is clamped into the other end of the limiting hole to be limited and fixed, so that compared with the existing method, the reinforcing steel bar is ensured not to fall off in the subsequent tensioning process;
(2) compared with the prior art that four steel bars are used as a spiral pile support, the method has the advantages that the welding connecting rods with the intervals of 20CM are arranged, six steel bars are used, the connecting rods are welded between the opposite steel bars, so that the framework structure of the steel bars is more stable, and the welding connecting rods with the intervals of 20CM are used for enabling subsequent cement pouring and solidification to be tighter;
by arranging the net distributing device, the wire is wound on the outer side of the steel bar through the rotation of the net distributing device, the outer circumference of the steel bar framework is R, when the driver drives the net distributing device to rotate R/6, the spot welding machine rotates 60 degrees along with the net distributing device for the first time to weld the wire for three times, when the spot welding machine rotates 60 degrees along with the net distributing device for the second time, the spot welding machine welds the wire for two times, when the spot welding machine rotates 60 degrees along with the net distributing device for the fourth time, the spot welding machine does not weld the wire, four cutting pieces in the cutting machine are linked with the rotating shaft, when the spot welding machine welds three times, the multi-section extending device extends out the first cutting piece to fall and cut the wire, when the electric welding machine welds twice, the first cutting piece and the second cutting piece of the cutting machine fall and cut the wire, the operation is repeated, compared with the prior method that the wire is manually wound on the outer side of the steel bar by one section, the manpower consumption that has greatly reduced, when the screw pile is in the use, receive weather effect, can expand when being heated, can contract when meeting cold. The movement of particles (atoms) in the spiral pile can change along with the temperature, when the temperature rises, the vibration amplitude of the particles is increased, so that the solidified cement and the reinforcing steel bar in the spiral pile expand, but when the temperature drops, the vibration amplitude of the particles is reduced, so that the particles shrink, for example, when desertified soil is renovated, the spiral pile is required to be arranged at the junction, sand and soil at two sides have different specific heat capacities, according to the difference of the heat absorption effects of the soil, one side with different iron wire gaps is selected for installation, if one side with all the four cut iron wires corresponds to the soil with more heat absorption, when the temperature of the spiral pile is higher, more gaps meet the requirement of thermal expansion, the damage of the spiral pile is avoided, the use range of the spiral pile is wider, and the spiral pile does not need to be manufactured again according to the terrain;
(3) step E is arranged, non-adhesive glue is brushed in the template, the fact that the screw pile is not adhered to the template in the manufacturing process is guaranteed, the demolding process is simpler and more convenient, compared with the existing method that cement is manually filled into the template through manpower through the automatic cement filling machine, manpower consumption is reduced, working efficiency is improved, the automatic cement filling machine rotates for 50 minutes from low custom to high speed, the cement is fully stirred and rotates in the template, bubbles are not generated in the cement after solidification, and production quality is guaranteed;
(4) the method comprises the steps of G, adjusting the steam pressure to 0.9-1.0 MPa, maintaining the poured concrete member in saturated steam with the relative humidity of more than 90% and the temperature of more than 60 ℃ and the temperature of about 180 ℃, longitudinally laying a steam pipe in a hollow state, not directly facing a beam body and a template when the steam is applied to avoid excessive maintenance caused by local high temperature, respectively arranging an exhaust fan and exhaust holes at the front end and the rear end of a steam maintenance device, blowing hot steam from one end to the other end of a spiral pile by the exhaust fan to ensure uniform steam maintenance, feeding the used steam into an outer layer of the steam device through the exhaust holes to circulate into a high-temperature evaporator for heating, blowing the steam by the exhaust fan to carry out thermal maintenance on the spiral device, wherein at least two groups of the high-temperature evaporators are respectively arranged at the front end and the rear end of the steam device, and a clamp is contacted with the spiral pile, the spiral pile is repeatedly moved back and forth outside the spiral pile, when the rubber pad slides to the area for maintenance completion, the rubber pad is compressed to start the driving device, the driving device independently guides high-temperature steam to the area for steam maintenance, compared with the existing method, the step realizes targeted maintenance while incomplete detection and maintenance, and also realizes the condition of avoiding generating local high temperature to cause excessive maintenance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a perspective view of a reinforcing bar fastening apparatus according to the present invention;
FIG. 2 is a schematic front view of the netting apparatus of the present invention;
FIG. 3 is a schematic view of the construction of the tensioning assistance device of the present invention;
FIG. 4 is a schematic flow chart of a manufacturing method of the present invention;
FIG. 5 is a schematic diagram of the working principle of step C of the present invention;
in the figure: 1. a reinforcing bar fastening device; 2. a net distributing device; 3. a tension assist device; 100. a limiting hole; 102. reinforcing steel bars; 103. a steel bar pile head; 104. a screw pile cap; 200. a partition plate; 201. iron wires; 300. a holder; 301. limiting latch teeth; 302. a plurality of clamping blocks; 303. a clamper.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: a method for manufacturing a steel mould of a pre-tensioned pre-stressed concrete prefabricated screw pile comprises a reinforcing steel bar 102, and is characterized in that: the device required in the method for manufacturing the steel mould of the prefabricated spiral pile comprises a steel bar fastening device 1, a net distributing device 2 and a tensioning auxiliary device 3;
the method comprises the following steps:
A. a reinforced pile head 103 and a spiral pile cap 104 are arranged at one end of the steel bar;
B. inserting the steel bar 102 into the steel bar framework device;
C. lapping the outer side of the steel bar 102, welding iron wires on the outer side of the steel bar 102 by using a net laying device 2, and cutting the iron wires;
D. tensioning prestress is carried out on the reinforcing steel bars 102 by using the tensioning auxiliary device 3;
E. placing the steel bar framework into a mould, pouring cement, stirring, solidifying and forming;
F. heating the screw pile;
G. curing the formed screw pile by using steam;
H. detecting the final finished product;
in the step A, firstly, a reinforcing steel bar pile head 103 is welded and installed at one end of a reinforcing steel bar 102, the diameter of the tail end of the reinforcing steel bar pile head 103 is larger than that of the tail end of the reinforcing steel bar 102, a reinforcing steel bar fastening device 1 comprises a spiral pile cap 104, the spiral pile cap 104 is sleeved and installed at the outer side of the reinforcing steel bar pile head 103, a plurality of limiting holes 100 are uniformly arranged inside the spiral pile cap 104, the size of one end of each limiting hole 100 is consistent with that of the reinforcing steel bar pile head 103, the size of the other end of each limiting hole 100 is consistent with that of the reinforcing steel bar 102, a bearing is arranged inside the spiral pile cap 104, the upper layer is a rotatable layer, the reinforcing steel, the reinforcing steel bar pile head 103 penetrates through one end of the limiting hole 100, the upper rotating layer of the spiral pile cap 104 is rotated, and the reinforcing steel bar pile head 103 is clamped into the other end of the limiting hole 100 for limiting and fixing, so that compared with the existing method, the reinforcing steel bar 102 is ensured not to fall off in the subsequent tensioning process;
in the step B, the reinforcement cage device 2 comprises six reinforcement reserved openings, six reinforcements are respectively inserted into the reinforcement reserved openings, connecting rods are uniformly welded and installed between two opposite reinforcements at intervals of 20CM, compared with the prior method that four reinforcements 102 are used as a spiral pile support, the method uses six reinforcements, and the connecting rods are welded between the opposite reinforcements 102, so that the reinforcement cage structure is more stable, and the welding of the connecting rods at intervals of 20CM has the effect of enabling subsequent cement pouring and solidification to be more compact;
in the step C, the net distributing device 2 is annular, a plurality of partition plates 200 are uniformly arranged in the net distributing device 2, iron wires 201 are arranged between the partition plates 200, a plurality of partition plates are uniformly arranged in the net distributing device, the iron wires are arranged between the partition plates, a driver, a spot welding machine and a cutter are arranged behind the net distributing device, the cutter comprises a plurality of sections of extending devices, the driver is positioned between the spot welding machine and the cutter, four cutting knives are arranged in the cutter,
if the outer circumference of the steel bar framework is R, when the driver drives the net distribution device to rotate R/6, the spot welding machine rotates 60 degrees along with the net distribution device for the first time to weld the iron wires for three times, rotates 60 degrees along with the net distribution device for the second time, welds the iron wires for two times, rotates 60 degrees along with the net distribution device for the third time, welds the iron wires for one time by the spot welding machine, rotates 60 degrees along with the net distribution device for the fourth time, the spot welding machine does not weld the iron wires, four cutting pieces in the cutting machine are linked with the rotating shaft, when the spot welding machine welds for three times, the multi-section extending device extends out of the first cutting piece to cut one iron wire, when the electric welding machine welds for two times, the first cutting piece and the second cutting piece of the cutting machine fall to cut two iron wires, the operation is repeated, compared with the existing method, the method manually winds and welds the iron wires on the outer side of the steel bar one by one, thereby greatly reducing the manpower, when the spiral pile is used, the spiral pile is influenced by weather, can expand when heated and can contract when cooled. The movement of particles (atoms) in the spiral pile can change along with the temperature, when the temperature rises, the vibration amplitude of the particles is increased, so that the solidified cement and the reinforcing steel bar in the spiral pile expand, but when the temperature drops, the vibration amplitude of the particles is reduced, so that the particles shrink, for example, when desertified soil is renovated, the spiral pile is required to be arranged at the junction, sand and soil at two sides have different specific heat capacities, according to the difference of the heat absorption effects of the soil, one side with different iron wire gaps is selected for installation, if one side with all the four cut iron wires corresponds to the soil with more heat absorption, when the temperature of the spiral pile is higher, more gaps meet the requirement of thermal expansion, the damage of the spiral pile is avoided, the use range of the spiral pile is wider, and the spiral pile does not need to be manufactured again according to the terrain;
in the step D, the auxiliary tensioning device 3 comprises a spindle hole 101 and a holder 300, the inside of the holder 300 is connected with a limiting latch 301 through a bearing, a plurality of clamping blocks 302 are arranged below the limiting latch 301, a tension rope 303 is arranged at the top end of the limiting latch 301, the other end of the tension rope 303 is wound on the spindle, the reinforcing steel bar 102 penetrates through the inside of the holder 303, a jack is started, the holder 300 clamps the reinforcing steel bar 102 to perform tensioning prestress on the reinforcing steel bar, when the reinforcing steel bar 102 needs to be tensioned, the auxiliary tensioning device 3 is firstly sleeved outside the reinforcing steel bar 102, the auxiliary tensioning device 3 is rotated, the limiting latch 301 in the holder 300 is clamped into the clamping grooves of the plurality of clamping blocks 302 to fasten and clamp the reinforcing steel bar 102, compared with the conventional method in which tensioning is performed only by means of the jack, the problem that the reinforcing steel bar;
step E, when cement is poured into the spiral pile, firstly, a layer of non-adhesive glue is brushed into the spiral pile template, the tensioned steel reinforcement framework is placed into the template, cement is poured into the template by using an automatic cement pouring machine, meanwhile, the motor is started, so that the main shaft rotates in the steel reinforcement framework in a grading manner for 50 minutes from a low speed, a medium speed and a high speed, the non-adhesive is brushed in the template, so that the screw pile is not adhered with the template in the manufacturing process, the demoulding process is simpler and more convenient, compared with the prior method that the cement is manually filled into the template by manpower, the automatic cement filling machine reduces the consumption of manpower, improves the working efficiency, rotates for 50 minutes from low custom to high speed, the cement is fully stirred and rotated in the template, so that no air bubbles are generated in the cement after solidification, and the production quality is ensured;
step F, standing the solidified and formed screw pile for 1-2 h, maintaining the constant temperature of the screw pile at 20-25 ℃ for 1h, heating the external temperature of the screw pile to 70 +/-5 ℃, and finally naturally cooling to 70 ℃ when the cement solidification temperature is stable, so that the cement in the screw pile is better matched with the tension prestress of the steel bar, and the bending resistance of the screw pile finished product is improved;
g, when the formed screw pile is cured by steam, adjusting the steam pressure to 0.9-1.0 MPa and the temperature to about 180 ℃, curing the poured concrete component in saturated steam with the relative humidity of more than 90% and the temperature of more than 60 ℃ and the steam pipe is laid in an empty longitudinal mode, the steam pipe does not directly face a beam body and a template when releasing the steam, so that excessive curing caused by local high temperature is avoided, an exhaust fan and exhaust holes are respectively arranged at the front end and the rear end of the steam curing device, the exhaust fan blows hot steam from one end to the other end of the screw pile to ensure uniform steam curing, the used steam enters an outer layer of the steam device through the exhaust holes to circulate into a high-temperature evaporator to be heated, and then the exhaust fan blows the hot steam to perform thermal curing on the screw device, at least two groups of high-temperature evaporators are respectively arranged at the front end and the rear end of the steam device, the clamp holder is contacted with the screw pile and repeatedly moves back and forth on the outer side of the screw pile, when the rubber pad slides to the area for maintenance completion, the rubber pad is compressed to start the driving device, and the driving device independently guides high-temperature steam to the area for steam maintenance.
The working principle is as follows: after the reinforcing steel bar pile head 103 is welded at the tail end of the reinforcing steel bar 102, the reinforcing steel bar pile head 103 penetrates through one end of the limiting hole 100, the upper rotating layer of the spiral pile cap 104 is rotated, and the reinforcing steel bar pile head 103 is clamped into the other end of the limiting hole 100 for limiting and fixing, so that compared with the existing method, the reinforcing steel bar 102 is ensured not to fall off in the subsequent tensioning process;
compared with the prior art that four steel bars 102 are used as the spiral pile support, the method uses six steel bars, and the connecting rods are welded between the opposite steel bars 102, so that the steel bar framework structure is more stable, and the connecting rods are welded at intervals of 20CM, so that the subsequent cement pouring and solidification are more compact;
if the outer circumference of the steel bar framework is R, when the driver drives the net distribution device to rotate R/6, the spot welding machine rotates 60 degrees along with the net distribution device for the first time to weld the iron wires for three times, rotates 60 degrees along with the net distribution device for the second time, welds the iron wires for two times, rotates 60 degrees along with the net distribution device for the third time, welds the iron wires for one time by the spot welding machine, rotates 60 degrees along with the net distribution device for the fourth time, the spot welding machine does not weld the iron wires, four cutting pieces in the cutting machine are linked with the rotating shaft, when the spot welding machine welds for three times, the multi-section extending device extends out of the first cutting piece to cut one iron wire, when the electric welding machine welds for two times, the first cutting piece and the second cutting piece of the cutting machine fall to cut two iron wires, the operation is repeated, compared with the existing method, the method manually winds and welds the iron wires on the outer side of the steel bar one by one, thereby greatly reducing the manpower, when the spiral pile is used, the spiral pile is influenced by weather, can expand when heated and can contract when cooled. The movement of particles (atoms) in the spiral pile can change along with the temperature, when the temperature rises, the vibration amplitude of the particles is increased, the particles are expanded, but when the temperature falls, the vibration amplitude of the particles is reduced, and the particles shrink;
the steel bar 102 penetrates through the inside of the clamp holder 303, the jack is started, the clamp holder 300 clamps the steel bar 102 to tension the steel bar, when the steel bar 102 needs to be tensioned, the auxiliary tensioning device 3 is firstly sleeved outside the steel bar 102, the auxiliary tensioning device 3 is rotated, the limiting latch 301 in the clamp holder 300 is clamped into the clamping grooves of the clamping blocks 302 to fasten and clamp the steel bar 102, and compared with the prior art in which the steel bar is tensioned by only depending on the jack, the problem that the steel bar and the jack slip is avoided;
when cement is poured into the spiral pile, firstly, a layer of non-adhesive glue is brushed in a spiral pile template, the tensioned steel bar framework is placed into the template, cement is poured into the template by using an automatic cement pouring machine, meanwhile, a motor is started, so that a main shaft rotates in the steel bar framework in a grading manner at a main shaft speed from low normal speed to medium speed to high speed for 50 minutes, the spiral pile is guaranteed not to be adhered with the template in the manufacturing process by brushing the non-adhesive glue in the template, the demolding process is simpler and more convenient, the automatic cement pouring machine fills the cement into the template manually by manpower compared with the existing method, the manpower consumption is reduced, the working efficiency is improved, the automatic cement pouring machine rotates from low normal speed to high speed for 50 minutes, the cement is enabled to be fully stirred and rotated in the template, bubbles are prevented from being generated in the cement after solidification, and the production quality is guaranteed;
standing the solidified spiral pile for 1-2 h, maintaining the constant temperature of the spiral pile at 20-25 ℃ for 1h, heating the external temperature of the spiral pile to 70 +/-5 ℃, and finally naturally cooling to 70 ℃ until the cement solidification temperature is stable, so that the cement in the spiral pile is better matched with the tension prestress of the reinforcing steel bars, and the bending resistance of the finished spiral pile is improved;
when the formed screw pile is cured by steam, the steam pressure is adjusted to 0.9-1.0 MPa, the temperature is about 180 ℃, the poured concrete component is cured in saturated steam with the relative humidity of 0.9-1.0 MPa, more than 90 percent and the temperature of more than 60 ℃, steam pipes are laid in a hollow longitudinal direction, the steam pipes do not directly face a beam body and a template when the steam is applied, the excessive curing caused by local high temperature is avoided, an exhaust fan and exhaust holes are respectively arranged at the front end and the rear end of a steam curing device, the exhaust fan blows hot steam from one end of the screw pile to the other end to ensure uniform steam curing, the used steam enters an outer layer of the steam device through the exhaust holes to circulate into a high-temperature evaporator to be heated, and then the exhaust fan blows to perform heat curing on the screw device, the high-temperature evaporator is at least two groups, the high-temperature evaporators are respectively arranged at the front end and the rear end of the steam device, a clamp holder is contacted with the, the spiral pile is repeatedly moved back and forth outside the spiral pile, when the rubber pad slides to the area for maintenance completion, the rubber pad is compressed to start the driving device, the driving device independently guides high-temperature steam to the area for steam maintenance, compared with the existing method, the step realizes targeted maintenance while incomplete detection and maintenance, and also realizes the condition of avoiding generating local high temperature to cause excessive maintenance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for manufacturing a steel mould of a pre-tensioned pre-stressed concrete prefabricated screw pile comprises a reinforcing steel bar (102), and is characterized in that: the device required in the method for manufacturing the prefabricated spiral pile steel die comprises a steel bar fastening device (1), a net distributing device (2) and a tensioning auxiliary device (3).
2. The method for manufacturing the steel die of the pretensioned prestressed concrete precast screw pile according to claim 1, wherein: the method comprises the following steps:
A. a reinforced pile head (103) and a spiral pile cap (104) are arranged at one end of the steel bar;
B. inserting a steel bar (102) into the steel bar framework device;
C. lapping the outer side of the steel bar (102), welding iron wires on the outer side of the steel bar (102) by using a net laying device (2), and cutting the iron wires;
D. tensioning prestress is carried out on the steel bar (102) by using the tensioning auxiliary device (3);
E. placing the steel bar framework into a mould, pouring cement, stirring, solidifying and forming;
F. heating the screw pile;
G. rotationally curing the formed spiral pile by using steam;
H. and detecting the final finished product.
3. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 2, wherein: firstly, install reinforcing bar pile head (103) welding in the one end of reinforcing bar (102) in step A, the terminal diameter ratio of reinforcing bar pile head (103) is big than the terminal diameter of reinforcing bar (102), reinforcing bar fastener (1) includes spiral pile cap (104), spiral pile cap (104) cup joint and install in reinforcing bar pile head (103) outside, the inside of spiral pile cap (104) evenly is provided with a plurality of spacing holes (100), the size of the one end size of spacing hole (100) is unanimous with the size of reinforcing bar pile head (103), the other end size of spacing hole (100) is unanimous with the size of reinforcing bar (102), spiral pile cap (104) inside is provided with the bearing, and the upper strata is rotatable layer.
4. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 3, wherein: and B, the steel bar framework device (2) comprises six steel bar reserved openings, the six steel bars are respectively inserted into the steel bar reserved openings, and connecting rods are uniformly welded and installed between the two opposite steel bars at intervals of 20 CM.
5. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 4, wherein: in the step C, the net distributing device (2) is annular, a plurality of partition plates (200) are uniformly arranged inside the net distributing device, iron wires (201) are arranged between the partition plates (200), a driver, a spot welding machine and a cutter are arranged behind the net distributing device, the cutter comprises a plurality of sections of extending devices, the driver is positioned between the spot welding machine and the cutter, and four cutting knives are arranged in the cutter;
if the outer circumference of the steel bar framework is R, when the driver drives the net distribution device to rotate R/6, the spot welding machine rotates for 60 degrees along with the net distribution device for the first time to weld the iron wires for three times, and rotates for 60 degrees along with the net distribution device for the second time, the spot welding machine welds the iron wires for two times, and rotates for 60 degrees along with the net distribution device, the spot welding machine welds the iron wires for one time, and rotates for 60 degrees along with the net distribution device for the fourth time, the spot welding machine does not weld the iron wires, four cutting pieces in the cutting machine are linked with the rotating shaft, when the spot welding machine welds for three times, the multi-section extending device extends out the first cutting piece to fall and cut one iron wire, and when the electric welding machine welds for two times, the first cutting piece and the second cutting piece of the cutting machine fall and cut two iron wires.
6. The method for manufacturing the steel die of the pretensioned prestressed concrete precast screw pile according to claim 5, wherein: step D stretch-draw auxiliary device (3) include spindle hole (101), holder (300), the inside of holder (300) is connected with spacing latch (301) through the bearing, the below of spacing latch (301) is provided with multisection fixture block (302), the top of spacing latch (301) is provided with pulling force rope (303), the other end winding of pulling force rope (303) is on the spindle, passes holder (303) with reinforcing bar (102) inside, starts the jack, and reinforcing bar (102) are carried in holder (300) and carry out the stretch-draw prestressing force to the reinforcing bar.
7. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 6, wherein: and E, when cement is poured into the spiral pile, brushing a layer of non-adhesive glue in a spiral pile template, putting the tensioned steel reinforcement framework into the template, pouring cement into the template by using an automatic cement pouring machine, and starting a motor to enable a main shaft to rotate in the steel reinforcement framework in a grading manner at a low speed, a medium speed and a high speed for 50 minutes.
8. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 7, wherein: and step F, standing the solidified and molded screw pile for 1-2 h, maintaining the constant temperature of the screw pile at 20-25 ℃ for 1h, heating the external temperature of the screw pile to 70 +/-5 ℃, and finally naturally cooling.
9. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 8, wherein: when the screw pile formed in the step G is cured by using steam, the selected steam device is of a double-layer structure, the pressure of the inner layer of the steam device is adjusted to 0.9-1.0 MPa, the temperature is about 180 ℃, the poured concrete member is cured in saturated steam with the relative humidity of more than 90% and the temperature of more than 60 ℃ in the pressure of 0.9-1.0 MPa, the steam pipe is laid in a hollow longitudinal mode, the steam device is of an inner-layer structure and an outer-layer structure, the inner layer of the steam device is provided with a curing detection device, the curing detection device comprises a clamp holder, a rubber pad is arranged on the inner side of the clamp holder, and a driving device is arranged above the rubber pad;
when the rubber pad slides to the area for curing, the rubber pad is compressed to start the driving device, and the driving device independently guides high-temperature steam to the area for steam curing.
10. The method for manufacturing the steel mold of the pretensioned prestressed concrete precast screw pile according to claim 9, wherein: and (H) demolding the final finished product, and measuring the bending resistance, the strength, the bent pipe quality and the size of the finished product.
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| CN112248220B (en) | 2022-01-18 |
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