CN113047300A - PHC supporting tubular pile construction method with crown beam built first - Google Patents
PHC supporting tubular pile construction method with crown beam built first Download PDFInfo
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- CN113047300A CN113047300A CN202110302734.5A CN202110302734A CN113047300A CN 113047300 A CN113047300 A CN 113047300A CN 202110302734 A CN202110302734 A CN 202110302734A CN 113047300 A CN113047300 A CN 113047300A
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- 238000010276 construction Methods 0.000 title claims abstract description 47
- 230000002787 reinforcement Effects 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- 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
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a PHC supporting tubular pile construction method by building a crown beam firstly, which comprises the following steps: s1Measuring the position and elevation of the crown beam on the ground, excavating a base groove according to the measurement result, and rechecking the position and elevation of the crown beam; s2Measuring the positions of the required PHC tubular pile cores and the reserved pipes at the bottom of the foundation trench, placing corresponding prefabricated pile casings by taking each PHC tubular pile core as the center, and inserting the corresponding reserved pipes at the bottom of the foundation trench according to the measured positions of the reserved pipes; s3Pouring a cushion layer on the bottom of the foundation trench, constructing a crown beam after the cushion layer reaches the strength, removing a mold after the crown beam reaches the strength, and flattening earthwork around the foundation trench to be flush with the top surface of the crown beam; s4Constructing corresponding PHC tubular piles in the pre-buried prefabricated pile casings to the designed elevation; s5Placing a steel reinforcement cage on each pre-embedded prefabricated pile casing, and then pouring concrete until the concrete is flush with the top surface of the crown beam; s6And performing high-pressure jet grouting pile construction through each reserved pipe.The method is simple and easy to construct, can improve the construction quality, quickens the construction progress and saves the construction cost.
Description
Technical Field
The invention relates to the technical field of PHC tubular pile construction, in particular to a PHC supporting tubular pile construction method by building a crown beam firstly.
Background
With the popularization of PHC tubular piles, PHC tubular piles can be designed in more and more foundation trench supports, the traditional PHC tubular pile construction mainly comprises hammering pile sinking, the PHC tubular piles are sent into the ground, then a crown beam foundation trench is excavated, piles with elevation not meeting design requirements are cut or spliced, a crown beam reinforcing steel bar formwork is bound to pour concrete, and finally continuous waterproof curtain construction is carried out on the outer side of a supporting pile.
According to the construction method, in the process of feeding the PHC tubular piles into the soil, due to the fact that technical levels of operators are uneven, elevation of pile feeding is not easy to control, when a crown beam foundation groove is excavated, part of elevation of the top of the PHC tubular pile is lower than that of the bottom of the crown beam, pile splicing is needed, part of elevation of the top of the PHC tubular pile is too large, pile cutting is needed, particularly, damage to the PHC tubular pile caused by pile cutting is large, construction quality of the PHC tubular pile is reduced, the PHC tubular pile is constructed firstly, then the crown beam foundation groove is excavated, excavation and cleaning of earthwork between the PHC tubular piles are troublesome, soil in a pile core of the PHC tubular pile also needs to be cleaned, and construction is extremely complicated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the PHC support tubular pile construction method by building the crown beam firstly, the method is simple and easy to construct, the construction quality can be improved, the construction progress is accelerated, and the construction cost is saved.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a PHC supporting tubular pile construction method for building a crown beam firstly comprises the following steps:
S1measuring the position and elevation of the crown beam on the ground, excavating a base groove according to the measuring result, and rechecking the position and elevation of the crown beam after the excavation is finished;
S2measuring the positions of a plurality of required PHC tubular pile cores and the positions of a plurality of required reserved pipes at the bottom of the foundation trench, placing corresponding prefabricated pile casings by taking each PHC tubular pile core as the center, enabling the plurality of prefabricated pile casings to be arranged at equal intervals along the length direction of the foundation trench, inserting corresponding reserved pipes at the bottom of the foundation trench according to the measured positions of the reserved pipes, enabling the plurality of reserved pipes to be arranged at equal intervals along the length direction of the foundation trench, and enabling the reserved pipes and the prefabricated pile casings to be alternately arranged;
S3pouring a cushion layer on the bottom of the foundation trench, binding a crown beam steel bar after the cushion layer reaches the strength, constructing a crown beam side mold, pouring crown beam concrete, removing the mold after the crown beam reaches the strength, and flattening earthwork on the periphery of the foundation trench to be flush with the top surface of the crown beam;
S4re-measuring the position of the pile core of the PHC pipe pile in each pre-buried prefabricated pile casing, and constructing the corresponding PHC pipe pile to a designed elevation;
S5placing a reinforcement cage on each pre-embedded prefabricated pile casing to enable the lower part of the reinforcement cage to be filled into the corresponding PHC tubular pile, and then pouring concrete in each prefabricated pile casing and the reinforcement cage corresponding to the prefabricated pile casing to be flush with the top surface of the crown beam;
S6and performing high-pressure jet grouting pile construction through each reserved pipe.
Further, the prefabricated pile casing is made of concrete, the size of the prefabricated pile casing is prefabricated according to the size of the PHC tubular pile, the inner diameter of the prefabricated pile casing is 100cm larger than the outer diameter of the PHC tubular pile, and the height of the prefabricated pile casing is equal to the sum of the thickness of the cushion layer and the height of the crown beam.
Furthermore, two through holes are symmetrically formed in the upper portion of the prefabricated protective cylinder.
Furthermore, the reinforcement cage is trumpet-shaped, and the diameter of the upper port of the reinforcement cage is larger than that of the lower port of the reinforcement cage.
Furthermore, the port of the lower end of the steel reinforcement cage is provided with a supporting plate which is disc-shaped, the diameter of each supporting plate is matched with the inner diameter of the corresponding PHC tubular pile, and each supporting plate is positioned in the corresponding PHC tubular pile.
Further, step S5In the middle, the poured concrete is slightly expanded with the strength higher than that of the crown beam concrete by one gradeAnd (3) concrete.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the construction method comprises the steps of constructing the top beam, placing the prefabricated pile casing with the inner diameter larger than the diameter of the PHC tubular pile before constructing the top beam, ensuring the construction and positioning of the PHC tubular pile, enabling the pile top of the PHC tubular pile to be visible in the whole construction process, easily ensuring the elevation control of the PHC tubular pile, not breaking and connecting the pile head of the PHC tubular pile in the later period, not damaging the PHC tubular pile and ensuring the construction quality of the PHC tubular pile.
2. The invention can avoid the following problems: 1. when the crown beam foundation groove is excavated, the excavation is blocked due to the PHC tubular piles, and earthwork between the PHC tubular piles is not easy to excavate; 2. after the crown beam foundation groove is excavated, the core soil of the PHC tubular pile needs to be cleaned, the crown beam foundation groove is excavated before the PHC tubular pile is constructed, the core soil of the PHC tubular pile does not need to be cleaned, the construction period of the crown beam and the PHC tubular pile is saved, the construction cost is saved, and the economic and social benefits are improved.
3. The invention adds the prefabricated pile casing, constructs a prefabricated pile casing, the cost plus the labor cost is about 40 yuan, the concrete volume occupied by the prefabricated pile casing can offset a part of the volume of concrete which should be poured, thus adding a prefabricated pile casing, actually only increasing 20 yuan of labor cost, the cost of breaking one PHC tubular pile head is 100 yuan, the cost of connecting one PHC tubular pile head is 150 yuan, the cost of picking up the pile core soil of one PHC tubular pile is 30 yuan per pile core soil, and in general, the invention saves the construction cost.
Drawings
FIG. 1 shows step S of example 12And (5) schematically illustrating the construction after the construction is finished.
FIG. 2 shows step S of example 13And (5) schematically illustrating the construction after the construction is finished.
FIG. 3 shows step S of example 14And (5) schematically illustrating the construction after the construction is finished.
FIG. 4 shows step S of example 15And (5) schematically illustrating the construction after the construction is finished.
FIG. 5 is a schematic view of the construction of example 1 after completion of all steps.
Fig. 6 is a sectional view taken along the line a-a in fig. 5.
Wherein, 1-cushion layer, 2-crown beam, 3-prefabricated pile casing, 4-PHC tubular pile, 5-reinforcement cage, 6-reserved pipe, 7-supporting plate and 8-perforation.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and the accompanying drawings.
Example 1
S1Measuring the position and elevation of the crown beam on the ground (by adopting a pay-off mode), excavating a foundation trench according to the measuring result, and rechecking the position and elevation of the crown beam after the excavation is finished;
S2as shown in fig. 1, the positions of a plurality of required PHC tubular piles 4 and the positions of a plurality of required reserved pipes are measured at the bottom of a foundation trench, a prefabricated pile casing 3 is placed by taking each PHC tubular pile 4 as a center, the prefabricated pile casings 3 are arranged at equal intervals along the length direction of the foundation trench, the size of each prefabricated pile casing 3 is prefabricated according to the size of a PHC tubular pile, the inner diameter of a general PHC tubular pile is about 100mm larger than that of the PHC tubular pile, the height of each prefabricated pile casing 3 is equal to the sum of the thickness of a cushion layer 1 and the height of a crown beam 2, in the embodiment, the wall thickness of each prefabricated pile casing 3 is 4cm, the inner diameter is 600mm, and the volume is 0.52m3The weight of the prefabricated pile casing is about 65kg, two through holes 8 are symmetrically formed in the upper portion of the prefabricated pile casing, the diameter of each through hole is 28mm, and due to the fact that the prefabricated pile casing is heavy in weight, two workers can use 25mm steel bars as lifting bars to lift the prefabricated pile casing, the position of the prefabricated pile casing is adjusted, the position of the prefabricated pile casing is accurately placed, and therefore the construction positioning accuracy of the PHC tubular pile is guaranteed;
inserting corresponding reserved pipes 6 into the bottom of a foundation trench according to the measured positions of the reserved pipes, enabling the reserved pipes 6 to be arranged at equal intervals along the length direction of the foundation trench, enabling the reserved pipes 6 and prefabricated protective cylinders 3 to be alternately arranged, enabling iron wires to penetrate through the perforated holes of the prefabricated protective cylinders when the reserved pipes 6 are fixed, fixing the reserved pipes by the iron wires, enabling the reserved pipes 6 to be used for construction by a high-pressure jet grouting method, enabling the reserved pipes 6 to be PVC pipes, enabling the length of the reserved pipes 6 to be 1-2cm larger than the diameter of a drill rod of a drilling machine, enabling the drill rod to smoothly pass through the reserved pipes, enabling the drill rod to be easier to drill without penetrating through a cushion layer;
S3as shown in figure 2, pouring a cushion layer 1 on the bottom of the foundation trench, binding a crown beam steel bar after the cushion layer 1 reaches the strength, constructing a crown beam side mold, then pouring crown beam concrete, removing the mold after the crown beam reaches the strength, flattening earthwork at the periphery of the foundation trench to be flush with the top surface of the crown beam 2, and after the cushion layer is poured, wrapping the periphery of the lower end of the reserved pipe by the cushion layer to play a role in stabilizing;
S4as shown in fig. 3, constructing corresponding PHC piles to a designed elevation according to the re-measured positions of the pile cores of the PHC piles 4 in the pre-buried prefabricated pile casings 3;
S5as shown in fig. 4, placing a reinforcement cage 5 on each pre-buried prefabricated protective cylinder 3, filling the lower part of each reinforcement cage 5 into a corresponding PHC tubular pile, wherein the reinforcement cage 5 is horn-shaped, the diameter of the upper port of each reinforcement cage 5 is larger than that of the lower port of each reinforcement cage, a support plate 7 is arranged on the lower port of each reinforcement cage 5, each support plate 7 is disc-shaped, the diameter of each support plate 7 is matched with the inner diameter of the PHC tubular pile, each support plate 7 is positioned in the corresponding PHC tubular pile 4, and when concrete is filled, the PHC tubular pile is longer, the whole PHC tubular pile is not filled with concrete, and the poured concrete is supported by the support plates;
then, concrete is poured into each prefabricated pile casing 3 and the corresponding reinforcement cage 5 until the concrete is flush with the top surface of the crown beam 2, the concrete poured here is micro-expansion concrete with the strength higher than that of the crown beam by one grade, and the connectivity of the PHC tubular pile 4 and the crown beam 2 can be ensured;
S6and high-pressure jet grouting pile construction is carried out through the reserved pipes, the high-pressure jet grouting pile is used for changing the permeability of soil among piles, damage such as seepage and the like after foundation pit excavation is avoided, and after all steps of construction are completed, the obtained structure is shown in fig. 5 and 6.
Claims (6)
1. A PHC supporting tubular pile construction method for building a crown beam firstly is characterized by comprising the following steps:
S1measuring the position and elevation of the crown beam on the ground, excavating a base groove according to the measuring result, and rechecking the position and elevation of the crown beam after the excavation is finished;
S2measuring the positions of a plurality of required PHC tubular pile cores and the positions of a plurality of required reserved pipes at the bottom of the foundation trench, placing corresponding prefabricated pile casings by taking each PHC tubular pile core as the center, enabling the plurality of prefabricated pile casings to be arranged at equal intervals along the length direction of the foundation trench, inserting corresponding reserved pipes at the bottom of the foundation trench according to the measured positions of the reserved pipes, enabling the plurality of reserved pipes to be arranged at equal intervals along the length direction of the foundation trench, and enabling the reserved pipes and the prefabricated pile casings to be alternately arranged;
S3pouring a cushion layer on the bottom of the foundation trench, binding a crown beam steel bar after the cushion layer reaches the strength, constructing a crown beam side mold, pouring crown beam concrete, removing the mold after the crown beam reaches the strength, and flattening earthwork on the periphery of the foundation trench to be flush with the top surface of the crown beam;
S4re-measuring the position of the pile core of the PHC pipe pile in each pre-buried prefabricated pile casing, and constructing the corresponding PHC pipe pile to a designed elevation;
S5placing a reinforcement cage on each pre-embedded prefabricated pile casing to enable the lower part of the reinforcement cage to be filled into the corresponding PHC tubular pile, and then pouring concrete in each prefabricated pile casing and the reinforcement cage corresponding to the prefabricated pile casing to be flush with the top surface of the crown beam;
S6and performing high-pressure jet grouting pile construction through each reserved pipe.
2. The PHC support tubular pile construction method of the pre-built crown beam according to claim 1, characterized in that: the prefabricated pile casing is made of concrete, the size of the prefabricated pile casing is prefabricated according to the size of the PHC tubular pile, the inner diameter of the prefabricated pile casing is 100cm larger than the outer diameter of the PHC tubular pile, and the height of the prefabricated pile casing is equal to the sum of the thickness of the cushion layer and the height of the crown beam.
3. The PHC support tubular pile construction method of the pre-built crown beam according to claim 1, characterized in that: two through holes are symmetrically arranged at the upper part of the prefabricated protective cylinder.
4. The PHC support tubular pile construction method of the pre-built crown beam according to claim 1, characterized in that: the reinforcement cage is trumpet-shaped, and the diameter of the upper port of the reinforcement cage is larger than that of the lower port of the reinforcement cage.
5. The PHC support tubular pile construction method of the pre-built crown beam according to claim 1, characterized in that: the lower port of the steel reinforcement cage is provided with a supporting plate which is disc-shaped, the diameter of each supporting plate is matched with the inner diameter of the corresponding PHC tubular pile, and each supporting plate is positioned in the corresponding PHC tubular pile.
6. The PHC support tubular pile construction method of the pre-built crown beam according to claim 1, characterized in that: step S5And the poured concrete is micro-expansion concrete with the strength higher than that of the crown beam concrete by one grade.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110302734.5A CN113047300A (en) | 2021-03-22 | 2021-03-22 | PHC supporting tubular pile construction method with crown beam built first |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110302734.5A CN113047300A (en) | 2021-03-22 | 2021-03-22 | PHC supporting tubular pile construction method with crown beam built first |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060614A (en) * | 2013-03-20 | 2014-09-24 | 中国二十冶集团有限公司 | Construction method of support pile of earlier constructed top beam |
| CN110397042A (en) * | 2019-07-13 | 2019-11-01 | 济邦建设集团有限公司 | A kind of support system of deep basal pit |
| CN210263075U (en) * | 2019-06-19 | 2020-04-07 | 深圳市中邦(集团)建设总承包有限公司 | Arrange bars formula tubular pile post back slip casting internal anchor outer stagnant water support system |
| CN112376598A (en) * | 2020-12-22 | 2021-02-19 | 湖南建工集团有限公司 | PHC pipe pile and highway bridge bearing platform connecting structure and construction method |
-
2021
- 2021-03-22 CN CN202110302734.5A patent/CN113047300A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060614A (en) * | 2013-03-20 | 2014-09-24 | 中国二十冶集团有限公司 | Construction method of support pile of earlier constructed top beam |
| CN210263075U (en) * | 2019-06-19 | 2020-04-07 | 深圳市中邦(集团)建设总承包有限公司 | Arrange bars formula tubular pile post back slip casting internal anchor outer stagnant water support system |
| CN110397042A (en) * | 2019-07-13 | 2019-11-01 | 济邦建设集团有限公司 | A kind of support system of deep basal pit |
| CN112376598A (en) * | 2020-12-22 | 2021-02-19 | 湖南建工集团有限公司 | PHC pipe pile and highway bridge bearing platform connecting structure and construction method |
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Application publication date: 20210629 |
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