CN115450208A - High-strength prestressed concrete square pile construction process - Google Patents
High-strength prestressed concrete square pile construction process Download PDFInfo
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- CN115450208A CN115450208A CN202211202916.6A CN202211202916A CN115450208A CN 115450208 A CN115450208 A CN 115450208A CN 202211202916 A CN202211202916 A CN 202211202916A CN 115450208 A CN115450208 A CN 115450208A
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- 238000010276 construction Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 57
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 19
- 230000035515 penetration Effects 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000003973 paint Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 6
- 230000000754 repressing effect Effects 0.000 description 4
- 239000002023 wood Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 208000004350 Strabismus Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a high-strength prestressed concrete square pile construction process, which relates to the technical field of square pile construction processes and aims to solve the technical problems that adjacent square piles cannot be positioned through fixed square piles, the positions of the square piles are easy to shift during pile pressing, perpendicularity detection is required for multiple times, construction efficiency is reduced, pile pressing operation can be only performed on one square pile each time, and the construction period is long in the prior art. The construction process comprises the following steps: s1: construction preparation; s2: measuring and lofting; s3: hoisting a pile; s4: pile pressing: s5: pile splicing; s6: pile sinking; s7: final pressing; s8: pile cutting; s9: and (5) pile pressing of the outer side square pile. This construction process utilizes the design of uide bushing, can fix a position adjacent square pile through fixed square pile, prevents that adjacent square pile from taking place the skew when pushing down, need not carry out the detection of straightness that hangs down many times, improves the efficiency of construction, can carry out the pile pressing operation to two square piles simultaneously to shorten construction cycle.
Description
Technical Field
The invention belongs to the technical field of prestressed square pile construction processes, and particularly relates to a high-strength prestressed concrete square pile construction process.
Background
The prestressed concrete square pile has the advantages of high bearing capacity, short production period, material saving and the like, when the address condition is poor and the bearing capacity of a foundation is small, one square pile is driven into the ground, the weight of a building on the ground is transmitted to a soil layer with high bearing capacity on the lower layer through the pile foundation, and the supporting effect on the building is improved.
At present, the invention patent with the patent number of CN202011326306.8 discloses a construction process of a building tubular pile, which specifically comprises the following steps: step one, leveling the ground: firstly, removing surface soil, leveling and rolling to ensure that the pile driver does not sink when running on a construction site and the machine does not settle during construction; step two, positioning the pile machine: the pile pressing machine is put in place to a pile pressing point, the pile pressing machine is well debugged, the center of a clamping jaw of the pile pressing machine is aligned with a positioning sample pile foundation on the ground to ensure vertical stability, the pile pressing machine is leveled, and the pile pressing machine does not incline or move in the construction process; step three, hoisting the precast tubular pile: firstly, fastening a hanging pile by using a steel wire rope and a rigging, then installing the rigging on a hanging ring of a pile pressing machine, starting a machine to lift the prefabricated pipe pile, enabling a pile tip to be vertically aligned with the pile centering, slowly putting down the pile and inserting the pile into the soil, and ensuring the position to be accurate; step four, pile stabilizing: after the pile tip is inserted into the pile position, firstly using a small drop distance cold hammer for 1-2 times, and enabling the pile to be vertically stable after the pile is embedded into the soil for a certain depth; step five, piling: when piling, the pile is clamped through the clamping oil cylinder, then the pile pressing oil cylinder extends to apply pressure to the pile, and the pressing force is reflected by the pressure gauge; step six, pile splicing: pile splicing is carried out when the distance between the pile splicing and the ground is 0.5-l.0 m, dirt and iron rust on the surface of a joint are removed by a steel wire brush before pile splicing, gaps between an upper section and a lower section are firmly welded by applying iron sheet pads, pile sinking can be continued after the welded pile joint is naturally cooled, the natural cooling time is 8-16min, and the dislocation deviation is not more than 2mm; step seven, pile feeding: the pile is sent according to the design requirement, and the center line of the pile is consistent with the pile body, so that the pile is sent. If the pile top is not flat, the pile can be filled with gunny bags or thick paper, and the pile hole left by pile feeding needs to be immediately backfilled tightly; step eight, acceptance detection: the penetration requirement is beaten to every stake, and stake point elevation gets into the holding power layer, when being close to the design elevation, or beat to the design elevation, should carry out the centre and examine and accept, when control, the average penetration that generally requires ten hammers of last cubic is not more than the numerical value of regulation, or beats to the design elevation with the stake point and controls, accords with the design requirement after, fills out construction record. Step nine, pile moving: and after the inspection is qualified, the construction platform is moved to a new construction ground through the pile moving machine. What its adopted is through the inspection and acceptance detection step that is equipped with, is favorable to improving the standard of construction technology, ensures the accurate nature of tubular pile construction, nevertheless this construction technology can not fix a position adjacent square pile through fixed square pile, and the position of square pile easily squints when the pile pressing, needs to carry out the detection of straightness that hangs down many times, reduces the efficiency of construction, and can only carry out the pile pressing operation to a square pile at every turn, construction cycle length.
Therefore, in order to solve the problems of easy deviation and long construction period in pile pressing, it is necessary to improve the use scenario of the prestressed concrete square pile.
Disclosure of Invention
(1) Technical problem to be solved
Aiming at the defects of the prior art, the invention aims to provide a high-strength prestressed concrete square pile construction process, which aims to solve the technical problems that adjacent square piles cannot be positioned through fixed square piles, the positions of the square piles are easy to shift during pile pressing, the perpendicularity detection needs to be carried out for multiple times, the construction efficiency is reduced, pile pressing operation can be carried out on only one square pile each time, and the construction period is long in the prior art.
(2) Technical scheme
In order to solve the technical problem, the invention provides a high-strength prestressed concrete square pile construction process, which comprises the following steps:
s1: construction preparation: cleaning sundries on a site within a range of 8m taking the side pile as a central point, compacting the side pile within a range of 5m outside an axis by using a road roller, numbering the square piles one by one according to a construction sequence, and marking a length mark on a pile body;
s2: measuring and lofting:
s21: finding a first pile placing point according to a design drawing, inserting a wood pile into the ground at the center point of the pile position, and marking the wood pile by using an iron nail or red paint after the wood pile is firmly driven;
s22: measuring the coordinates of the pile placing points, if the error is less than 2cm, keeping the pile placing points, and if the error is more than 2cm, adjusting the positions of the pile placing points;
s23: repeating the steps S21-S22 until all pile placing points are marked;
s3: pile hoisting:
s31: lifting the square pile: starting a crane to hoist the piles, piling from the middle to the two ends in sequence, enabling pile tips to be vertically aligned with a middle pile placing point, enabling the pile tips to be vertically aligned with the pile placing point, then slowly lowering the pile tips, and inserting the square piles into the ground by the dead weight of a pile hammer for 30-50cm;
s32: positioning a square pile: meanwhile, the perpendicularity of the square pile is controlled in a two-way mode by two orthogonal theodolites, and after the perpendicularity error meets the requirement, pile hoops are fastened, and rigging of a crane is removed;
s4: pile pressing:
s41: clamping the square pile by using the clamp, and then starting a pile pressing oil cylinder to press the square pile downwards;
s42: loosening the clamp and lifting the position of the clamp, then clamping the square pile, and pressing the square pile downwards again;
s43: repeating S42 until the distance between the pile top and the ground is 80-100 cm;
s5: pile splicing: ensuring that straight axes of an upper square pile and a lower square pile are aligned, completely backing and welding gaps of the upper square pile and the lower square pile by wedge-shaped iron sheets, symmetrically spot-welding 4-8 points on the peripheries of the upper square pile and the lower square pile, fully welding a welding line, removing welding slag by welding, and naturally cooling;
s6: pile sinking: inserting the upper section square pile into the soil, and repeating the operation of S4 until the error between the distance from the pile top to the ground and the elevation of the pile top is less than +/-8 cm;
s7: final pressure:
s71: determining a final pressure standard according to an experimental result of the field pile test;
s72: re-pressing the square piles, wherein the number of re-pressing times is 2-3 for piles with the soil penetration depth of more than or equal to 8m, and the number of re-pressing times is 3-5 for piles with the soil penetration depth of less than 8 m;
s8: pile cutting: cutting the redundant pile body exposed on the ground by using a pile splicing device;
s9: pile pressing of the outer side square pile: sleeving an adjustable guide sleeve on the outer side of the square pile, fixing the guide sleeve, adjusting the distance from two ends of the guide sleeve to the middle square pile to enable the central points of two ends of the guide sleeve to be vertically aligned with the central point of the pile placing point respectively, then hoisting the other two square piles to be inserted into the guide sleeve respectively, repeating S3-S8, and finally taking down the guide sleeve until all the square piles are buried underground.
Further, the length marks of the pile body in the S1 are marked in sequence from bottom to top, and the length marks are in meters.
Further, the requirement of the verticality error in S32 is not more than 0.5%.
Furthermore, when the square pile is pressed down in the step S4, the soil penetration depth of the square pile is 1.5-2m, and the pressing progress is not more than 2m/min.
Furthermore, the dislocation deviation of four corners of the upper square pile and the lower square pile in the S5 is not more than 2mm.
Furthermore, the number of welding in S5 is not less than 2, a first welding rod is a thin welding rod, a second welding rod and above are thick welding rods, and the time of natural cooling after welding is not less than 8min.
Further, the pile pressing force of the re-pressing in the S7 is greater than the final pressure standard.
Further, the time for stabilizing the pile pressing in the step S72 is 5-10S.
Further, the error between the distance from the pile top to the ground after pile cutting in the S8 and the elevation of the pile top is less than +/-8 cm.
Furthermore, the guide sleeve is composed of three square-shaped sleeves, the distance between the square-shaped sleeves on two sides and the middle square-shaped sleeve is adjustable, and a fastening piece is arranged on the middle square-shaped sleeve.
(3) Advantageous effects
Compared with the prior art, the invention has the beneficial effects that: the construction process of the invention utilizes the design of the guide sleeve, can position the adjacent square piles through the fixed square piles, prevents the adjacent square piles from deviating when being pressed down, does not need to detect the verticality for many times, improves the construction efficiency, improves the position precision of the square piles, reduces the verticality error between the adjacent square piles, and can simultaneously press two square piles, thereby shortening the construction period.
Detailed Description
The specific embodiment is a high-strength prestressed concrete square pile construction process, which comprises the following steps:
s1: construction preparation: cleaning sundries on a site within a range of 8m taking the side pile as a central point, compacting the side pile within a range of 5m outside an axis by using a road roller, numbering the square piles one by one according to a construction sequence, and marking a length mark on a pile body;
s2: measurement and lofting:
s21: finding a first pile placing point according to a design drawing, inserting a wooden pile into the ground at the center point of the pile position, and marking the wooden pile by using an iron nail or red paint after the wooden pile is firmly driven;
s22: measuring the coordinates of the pile placing points, if the error is less than 2cm, keeping the pile placing points, and if the error is more than 2cm, adjusting the positions of the pile placing points;
s23: repeating the steps S21-S22 until all pile placing points are marked;
s3: pile hoisting:
s31: hoisting the square piles: starting a crane to hoist the piles, piling the piles from the middle to the two ends, vertically aligning the pile tips with the middle pile placing points, vertically aligning the pile tips with the pile placing points, slowly lowering the piles, and inserting the square piles into the ground by the self weight of a pile hammer for 30-50cm;
s32: positioning a square pile: meanwhile, the perpendicularity of the square pile is controlled in a two-way mode by two orthogonal theodolites, and after the perpendicularity error meets the requirement, pile hoops are fastened, and rigging of a crane is removed;
s4: pile pressing:
s41: the clamp clamps the square pile, then the pile pressing oil cylinder is started, and the square pile is pressed downwards;
s42: loosening the clamp and lifting the position of the clamp, then clamping the square pile, and pressing the square pile downwards again;
s43: repeating S42 until the distance between the pile top and the ground is 80-100 cm;
s5: pile splicing: ensuring that straight axes of an upper square pile and a lower square pile are aligned, completely backing and welding gaps of the upper square pile and the lower square pile by wedge-shaped iron sheets, symmetrically spot-welding 4-8 points on the peripheries of the upper square pile and the lower square pile, fully welding a welding line, removing welding slag by welding, and naturally cooling;
s6: pile sinking: inserting the upper section square pile into the soil, and repeating the operation of S4 until the error between the distance from the pile top to the ground and the elevation of the pile top is less than +/-8 cm;
s7: final pressure:
s71: determining a final pressure standard according to an experimental result of the on-site pile test;
s72: re-pressing the square piles, wherein the number of re-pressing times is 2-3 for piles with the soil penetration depth of more than or equal to 8m, and the number of re-pressing times is 3-5 for piles with the soil penetration depth of less than 8 m;
s8: pile cutting: cutting the residual pile body exposed on the ground by using a pile splicing device for the square pile which cannot be buried in the soil;
s9: pile pressing of the outer side square pile: sleeving an adjustable guide sleeve on the outer side of the square pile, fixing the guide sleeve, adjusting the distance from two ends of the guide sleeve to the middle square pile to enable the central points of two ends of the guide sleeve to be respectively aligned with the central point of the pile placing point up and down, then hoisting the other two square piles to be respectively inserted into the guide sleeve, repeating S3-S8, and finally taking down the guide sleeve until all the square piles are buried underground.
Further, the length marks of the pile body in the S1 are marked in sequence from bottom to top, and the length marks are in meters.
Further, the requirement of the verticality error in S32 is not more than 0.5%.
Furthermore, when the square pile is pressed down in S4, the soil penetration depth of the square pile is 1.5-2m, and the pressing progress does not exceed 2m/min.
Furthermore, the dislocation deviation of four corners of the upper square pile and the lower square pile in the S5 is not more than 2mm.
Furthermore, the number of welding in S5 is not less than 2, a thin welding rod is adopted for the first welding, a thick welding rod is adopted for the second welding and above, and the time of natural cooling after welding is not less than 8min.
Further, the pile pressing force of the re-pressing in the S7 is larger than the final pressure standard.
Further, the time for stabilizing the pile pressing in S72 is 5-10S.
Further, the error between the distance from the pile top to the ground after pile cutting in the S8 and the elevation of the pile top is less than +/-8 cm.
Furthermore, the guide sleeve comprises three return type sleeves, the distance between the return type sleeves on two sides and the middle return type sleeve is adjustable, and a fastening piece is arranged on the return type sleeve in the middle.
When the construction process of the technical scheme is used, the steps are as follows:
s1: construction preparation: cleaning sundries on a site with the side piles as the center points within the range of 8m, compacting the side piles within the range of 5m outside the axis by using a road roller, numbering the square piles one by one according to the construction sequence, marking length marks on the pile bodies, marking the length marks of the pile bodies according to the sequence from bottom to top, and taking the length marks as the unit of meter;
s2: measuring and lofting:
s21: finding a first pile placing point according to a design drawing, inserting a wooden pile into the ground at the center point of the pile position, and marking the wooden pile by using an iron nail or red paint after the wooden pile is firmly driven;
s22: measuring the coordinates of the pile placing points, if the error is less than 2cm, keeping the pile placing points, and if the error is more than 2cm, adjusting the positions of the pile placing points;
s23: repeating the steps S21-S22 until all pile placing points are marked;
s3: pile hoisting:
s31: hoisting the square piles: starting a crane to hoist the pile, piling from the middle to two ends in sequence, enabling the pile tip to be vertically aligned with the middle pile placing point, enabling the pile tip to be vertically aligned with the pile placing point, then slowly lowering the pile, and inserting the square pile into the ground by using the self weight of a pile hammer for 45cm;
s32: positioning a square pile: meanwhile, the perpendicularity of the square pile is controlled in a two-way mode by two orthogonal theodolites, the perpendicularity error does not exceed 0.5%, the pile hoop is buckled, and a rigging of a crane is removed;
s4: pile pressing:
s41: clamping a square pile by using a clamp, starting a pile pressing oil cylinder, and pressing the square pile downwards, wherein the soil penetration depth of the square pile is 1.8m and the pressing progress is not more than 2m/min when the square pile is pressed downwards each time;
s42: loosening the clamp and lifting the position of the clamp, then clamping the square pile, and pressing the square pile downwards again;
s43: repeating S42 until the distance between the pile top and the ground is 80 cm;
s5: pile splicing: ensuring that straight axes of upper and lower two sections of square piles are aligned, wherein the dislocation deviation of four corners of the upper and lower two sections of square piles is not more than 2mm, completely backing and welding gaps of the upper and lower two sections of square piles by wedge-shaped iron sheets, firstly symmetrically spot-welding 8 points on the peripheries of the upper and lower two sections of square piles, fully welding seams, removing welding slag by welding, naturally cooling, wherein the number of welding tracks is not less than 2, and the time of naturally cooling after welding is not less than 8min;
s6: pile sinking: inserting the upper section square pile into the soil, and repeating the operation of S4 until the error between the distance from the pile top to the ground and the elevation of the pile top is less than +/-8 cm;
s7: final pressure:
s71: determining a final pressure standard according to an experimental result of the on-site pile test;
s72: and (3) repressing the square pile, wherein the pile-pressing force of repressing is greater than the final pressure standard, the repressing times are 3 for the pile with the soil-entry depth greater than or equal to 8m, the repressing times are 5 for the pile with the soil-entry depth less than 8m, and the time for stabilizing the pile is 8s.
S8: pile cutting: cutting the residual pile body exposed on the ground by using a pile splicing device after the pile is cut, wherein the error between the distance from the pile top to the ground and the elevation of the pile top is less than +/-8 cm;
s9: pile pressing of the outer side square pile: sleeving an adjustable guide sleeve on the outer side of the square pile, fixing the guide sleeve, adjusting the distance from two ends of the guide sleeve to the middle square pile to enable central points of two ends of the guide sleeve to be vertically aligned with the central point of a pile placing point respectively, then hoisting the other two square piles to be inserted into the guide sleeve respectively, repeating S3-S8, and finally taking down the guide sleeve until all the square piles are buried underground, wherein the guide sleeve is composed of three back-shaped sleeves, the distance between the back-shaped sleeves on two sides and the middle back-shaped sleeve is adjustable, and a fastener is arranged on the middle back-shaped sleeve.
Claims (10)
1. A high-strength prestressed concrete square pile construction process is characterized by comprising the following steps:
s1: construction preparation: cleaning sundries on a site within a range of 8m taking the side pile as a central point, compacting the side pile within a range of 5m outside an axial line by using a road roller, numbering the square piles one by one according to a construction sequence, and marking a length mark on a pile body;
s2: measuring and lofting:
s21: finding a first pile placing point according to a design drawing, inserting a wooden pile into the ground at the center point of the pile position, and marking the wooden pile by using an iron nail or red paint after the wooden pile is firmly driven;
s22: measuring the coordinates of the pile placing points, if the error is less than 2cm, keeping the pile placing points, and if the error is more than 2cm, adjusting the positions of the pile placing points;
s23: repeating the steps S21-S22 until all pile placing points are marked;
s3: pile hoisting:
s31: hoisting the square piles: starting a crane to hoist the piles, piling the piles from the middle to the two ends, vertically aligning the pile tips with the middle pile placing points, vertically aligning the pile tips with the pile placing points, slowly lowering the piles, and inserting the square piles into the ground by the self weight of a pile hammer for 30-50cm;
s32: positioning a square pile: meanwhile, the perpendicularity of the square pile is controlled in a two-way mode by two orthogonal theodolites, and after the perpendicularity error meets the requirement, pile hoops are buckled, and riggings of a crane are removed;
s4: pile pressing:
s41: clamping the square pile by using the clamp, and then starting a pile pressing oil cylinder to press the square pile downwards;
s42: loosening the clamp, lifting the position of the clamp, then clamping the square pile, and pressing the square pile downwards again;
s43: repeating S42 until the distance between the pile top and the ground is 80-100 cm;
s5: pile splicing: ensuring that straight axes of an upper square pile and a lower square pile are aligned, completely backing and welding gaps of the upper square pile and the lower square pile by wedge-shaped iron sheets, symmetrically spot-welding 4-8 points on the peripheries of the upper square pile and the lower square pile, fully welding a welding line, removing welding slag by welding, and naturally cooling;
s6: pile sinking: inserting the upper section square pile into the soil, and repeating the operation of S4 until the error between the distance from the pile top to the ground and the elevation of the pile top is less than +/-8 cm;
s7: final pressure:
s71: determining a final pressure standard according to an experimental result of the field pile test;
s72: re-pressing the square piles, wherein the re-pressing times are 2-3 times for piles with the soil penetration depth of more than or equal to 8m, and 3-5 times for piles with the soil penetration depth of less than 8 m;
s8: pile cutting: cutting the redundant pile body exposed on the ground by using a pile splicing device;
s9: pile pressing of the outer side square pile: sleeving an adjustable guide sleeve on the outer side of the square pile, fixing the guide sleeve, adjusting the distance from two ends of the guide sleeve to the middle square pile to enable the central points of two ends of the guide sleeve to be vertically aligned with the central point of the pile placing point respectively, then hoisting the other two square piles to be inserted into the guide sleeve respectively, repeating S3-S8, and finally taking down the guide sleeve until all the square piles are buried underground.
2. The construction process of the high-strength prestressed concrete square pile according to claim 1, wherein length marks of the pile body in the S1 are marked in the order from bottom to top, and the length marks are in meters.
3. The construction process of a high strength prestressed concrete square pile according to claim 1, characterized in that the requirement of the verticality error in S32 is not more than 0.5%.
4. The construction process of the high-strength prestressed concrete square pile according to claim 1, characterized in that in S4, the depth of the square pile into the soil is 1.5-2m and the pressing progress is not more than 2m/min when the square pile is pressed down each time.
5. The construction process of the high-strength prestressed concrete square pile according to claim 1, characterized in that the dislocation deviation of four corners of two upper and lower sections of square piles in S5 is not more than 2mm.
6. The construction process of the high-strength prestressed concrete square pile as claimed in claim 1, wherein the number of welding in S5 is not less than 2, the first pass adopts thin welding rods, the second and above pass adopts thick welding rods, and the time of natural cooling after welding is not less than 8min.
7. The construction process of the high-strength prestressed concrete square pile according to claim 1, characterized in that the pile pressing force of the S7 intermediate-pressure is greater than the final pressure standard.
8. The process of claim 1, wherein the stabilizing of the pile in S72 is performed for 5-10S.
9. The process of claim 1, wherein the difference between the distance from the top of the cut pile to the ground and the elevation of the top of the pile in S8 is less than ± 8cm.
10. The high-strength prestressed concrete square pile construction process according to claim 1, wherein the guide sleeve is composed of three return-shaped sleeves, the distance between the return-shaped sleeves on two sides and the middle return-shaped sleeve is adjustable, and a fastener is arranged on the return-shaped sleeve in the middle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211202916.6A CN115450208A (en) | 2022-09-29 | 2022-09-29 | High-strength prestressed concrete square pile construction process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211202916.6A CN115450208A (en) | 2022-09-29 | 2022-09-29 | High-strength prestressed concrete square pile construction process |
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| Publication Number | Publication Date |
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| CN115450208A true CN115450208A (en) | 2022-12-09 |
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|---|---|---|---|
| CN202211202916.6A Pending CN115450208A (en) | 2022-09-29 | 2022-09-29 | High-strength prestressed concrete square pile construction process |
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| Country | Link |
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| CN (1) | CN115450208A (en) |
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- 2022-09-29 CN CN202211202916.6A patent/CN115450208A/en active Pending
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