AU2021100056A4 - Construction method of static pressing and post-grouting for small-diameter mini-sized steel pipe pile - Google Patents
Construction method of static pressing and post-grouting for small-diameter mini-sized steel pipe pile Download PDFInfo
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- AU2021100056A4 AU2021100056A4 AU2021100056A AU2021100056A AU2021100056A4 AU 2021100056 A4 AU2021100056 A4 AU 2021100056A4 AU 2021100056 A AU2021100056 A AU 2021100056A AU 2021100056 A AU2021100056 A AU 2021100056A AU 2021100056 A4 AU2021100056 A4 AU 2021100056A4
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/26—Placing by using several means simultaneously
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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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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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
Disclosed a construction method of static pressing and post-grouting for a small-diameter mini
sized steel pipe pile, which specifically includes the steps of fabrication of a small-diameter steel
pipe pile, pile pressing, steel pipe inner wall cleaning, gravity grouting, pressure grouting, static
curing, and concrete casting. The construction method of static pressing and post-grouting for a
mini-sized steel pipe pile of the present disclosure permits pressing a small-diameter steel pipe into
the soil first, placing finished deformed steel bars into the steel pipe after the inner wall of the steel
pipe is cleaned up by means of water pressure, and then starting grouting. This may lead to small
pile pressing resistance to the small-diameter steel pipe, small load on the pile body, unapparent soil
squeezing effect, guaranteed perpendicularity, high construction efficiency, and low comprehensive
cost. Besides, the finished deformed steel bars are added into the steel pipe, which provide pulling
resistance on the one hand, and facilitate subsequent connection with the foundation on the other
hand. Moreover, staged post-grouting is adopted, thus allowing for enhanced mixing of cement
grout and soil mass surrounding the pile foundation and significantly improved bearing capacity.
Description
The present invention relates to the technical field of construction of mini-sized steel pipe pile foundations, and more particularly to a construction method of static pressing and post-grouting for a small-diameter mini-sized steel pipe pile.
A mini-sized steel pipe pile foundation is a steel pipe pile foundation having a diameter of not more than 300 mm and a length-to-diameter ratio of not less than 30, which is usually used in reinforcement and renovation projects of building, bridge and power transmission line equipment foundations. Existing constructions methods for mini-sized steel pipe pile foundations mainly come in four types: hammering, spiral drilling, static pressing, and pre-boring burying. The hammering construction method refers to hammering a steel pipe pile into the soil. The spiral drilling construction method refers to pressing a steel pipe pile having a threaded pile body into the soil by rotating. The static pressing construction method refers to pressing a steel pipe pile into the soil using externally applied counterforce. The pre-boring burying construction method refers to first boring a hole in the soil, then placing a steel pipe pile into the hole and injecting grout into the bored hole,
The hammering construction method may easily cause damage of the pile body because the steel pipe is hammered into the soil using the impact force of a gravity hammer, and it may be difficult to guarantee the perpendicularity of the pile body; besides, noise and oil smoke pollutions may be produced during the construction. The spiral drilling construction method requires additional thread welding on the steel pipe, leading to high pile foundation cost, and is mainly used for anti-pulling pile foundations. The static pressing construction method requires that a pile pressing counterforce device can be provided on site, and has the disadvantages of low pile pressing efficiency in case of a long pile body or a large pile diameter, and obvious soil squeezing effect that may occur in case of a large pile diameter and adversely affect pipelines around or neighboring buildings. The pre-boring burying construction method requires boring a hole first and then placing the steel pipe pile into the hole, and may have the problems of easy hole collapse in case of poor soil conditions with influence on subsequent grouting, environmental pollution due to discharge of a large quantity of mud during hole boring, and high total construction cost.
Preferred embodiment of the present invention seek to provide a construction method of static pressing and post-grouting for a small-diameter mini-sized steel pipe pile that is simple, low in construction efficiency and low in cost and can provide high bearing capacity of the pile foundation.
According to an aspect of the present invention, there is provided a construction method of static pressing and post-grouting for a small-diameter mini-sized steel pipe pile that includes the steps of fabrication of a small-diameter steel pipe pile, pile pressing, steel pipe inner wall cleaning, gravity grouting, pressure grouting, static curing, and concrete casting, and specifically includes the following steps:
step 1, cutting a small-diameter steel pipe into segments on site, and forming holes in the wall of the pipe, where the steel pipe pile has a diameter of 70-140 mm, and each steel pipe segment has a length of 3-6 m, while the pile foundation has an overall length of 9-15 m; statically pressing the steel pipe segments into the soil one by one after the completion of processing of each segment; connecting different steel pipe segments by welding or by means of sleeves, and welding a pile tip to the bottom of the steel pipe;
step 2, placing a water jet pipe into the steel pipe after the steel pipe pile is statically pressed in a design position, and clearing away the soil that passes through the holes in the wall of the pipe into the steel pipe during the pile pressing by means of water pressure;
step 3, placing finished deformed steel bars and a grouting pipe into the steel pipe pile simultaneously after the steel pipe is internally cleaned up; injecting cement grout from the bottom by means of the weight of the grout, and lifting the grouting pipe while grouting until the steel pipe is full of the grout;
step 4, mounting a grouting nozzle on which a valve is disposed at the upper end of the pressed-in steel pipe pile, and then starting a first stage of pressure grouting, which is finished until the volume of the injected grout is twice that of the steel pipe;
step 5, starting a second stage of pressure grouting, which is finished until the total volume of the injected grout is triple that of the steel pipe;
step 6, removing the grouting nozzle, cleaning up the pile tip of the steel pipe pile, and then mounting a sealing plate and nuts; and
step 7, removing protection nuts, and casting a concrete foundation, thus completing the construction.
Further, in the step 1, different steel pipe segments may be connected by means of sleeves or by welding in case of a pile diameter of not more than 100 mm, and welded together in case of a pile diameter of more than 100 mm.
Further, in the step 1, the hole position in the wall of the steel pipe may be within 2/3 of the overall length of the pile body from the pile tip in the vertical direction. Holes may be symmetrically formed in 1-2 positions in the wall of each steel pipe segment, and each hole may not be limited in shape, but required to have a dimension in limiting the any direction not exceeding 1/3 of the diameter of the steel pipe.
Further, in the step 1, an end plate of the pile tip may have a diameter 1.3-1.5 times that of the steel pipe.
Further, in the step 2, the water jet pipe may be used to rinse off soil on the inner wall of the steel pipe under a water jet pressure of 0.1-0.2 MPa.
Further, in the step 3, the finished deformed steel bar may have a diameter of 25-50 mm and ultimate strength of 400-800 MPa. When placed, the finished deformed steel bars may be fixed by retaining rings. The retaining rings may be disposed every 4-6 m.
Further, the injected grout may have a water-to-cement ratio of 0.5-0.8.
Further, in the step 4, a grouting pressure in the first stage of pressure grouting may be controlled to a range of 0.4-0.8 MPa, and held statically for 10-15 minutes after the grouting is finished.
Further, in the step 5, a grouting pressure in the second stage of pressure grouting may be controlled to a range of 2-4 MPa, and the grouting valve may be closed to keep static for 15-30 minutes after the grouting is plate a beam.
Further, in the step 6, the pile head should be cleaned immediately after the grouting nozzle is removed, and a sealing plate and protection nuts may be mounted.
Compared with the prior art, the construction method of static pressing and post-grouting for a mini-sized steel pipe pile provided in the present disclosure permits pressing a small-diameter steel pipe into the soil first, placing finished deformed steel bars into the steel pipe after the inner wall of the steel pipe is cleaned up by means of water pressure, and then starting grouting. This may lead to small pile pressing resistance to the small-diameter steel pipe, small load on the pile body, unapparent soil squeezing effect, guaranteed perpendicularity, high construction efficiency, and low comprehensive cost. According to the present disclosure, the finished deformed steel bars are added into the steel pipe, which provide pulling resistance on the one hand, and facilitate subsequent connection with the foundation on the other hand. Moreover, staged post-grouting is adopted according to the present disclosure, thus allowing for enhanced mixing of cement grout and soil mass surrounding the pile foundation and significantly improved bearing capacity. Tests and engineering applications show that pile foundations constructed by the disclosed method can have compressive bearing capacity increased by 2-3 times and pulling resistance increased by 1.5-2.0 times.
The present disclosure will be further described below in conjunction with specific embodiments.
Embodiment 1
A construction method of static pressing and post-grouting for a small-diameter mini-sized steel pipe pile specifically includes the following steps.
Step 1, a small-diameter steel pipe is cut into segments on site, and holes are formed in the wall of the pipe, where the steel pipe pile has a diameter of 70-140 mm, and each steel pipe segment has a length of 3-6 m, while the pile foundation has an overall length of 9-15 m. The steel pipe segments are statically pressed into the soil one by one after the completion of processing of each segment. Different steel pipe segments are connected by welding or by means of sleeves, and a pile tip is welded to the bottom of the steel pipe.
Step 2, a water jet pipe is placed into the steel pipe after the steel pipe pile is statically pressed in a design position, and the soil that passes through the holes in the wall of the pipe into the steel pipe during the pile pressing is cleared away by means of water pressure.
Step 3, finished deformed steel bars and a grouting pipe are placed into the steel pipe pile simultaneously after the steel pipe is internally cleaned up. Cement grout is injected from the bottom by means of the weight of the grout, and the grouting pipe is lifted while grouting until the steel pipe is full of the grout.
Step 4, a grouting nozzle on which a valve is disposed is mounted at the upper end of the pressed-in steel pipe pile, and then a first stage of pressure grouting is started, which is finished until the volume of the injected grout is twice that of the steel pipe.
Step 5, a second stage of pressure grouting is started, which is finished until the total volume of the injected grout is triple that of the steel pipe.
Step 6, the grouting nozzle is removed, and the pile tip of the steel pipe pile is cleaned up. Then, a sealing plate and nuts are mounted.
Step 7, protection nuts are removed, and a concrete foundation is cast. Thus, the construction is completed.
Embodiment 2
A construction method of static pressing and post-grouting for a small-diameter mini-sized steel pipe pile specifically includes the following steps.
Step 1, a small-diameter steel pipe is cut into segments on site, and holes are formed in the wall of the pipe, where the steel pipe pile has a diameter of 70-140 mm, and each steel pipe segment has a length of 3-6 m, while the pile foundation has an overall length of 9-15 m. The steel pipe segments are statically pressed into the soil one by one after the completion of processing of each segment. Different steel pipe segments are connected by means of sleeves or by welding in case of a pile diameter of not more than 100 mm, and welded together in case of a pile diameter of more than 100 mm. A pile tip is welded to the bottom of the steel pipe, where an end plate of the pile tip may have a diameter 1.3-1.5 times that of the steel pipe.
The hole position in the wall of the steel pipe may be within 2/3 of the overall length of the pile body from the pile tip in the vertical direction. Holes may be symmetrically formed in 1-2 positions in the wall of each steel pipe segment, and each hole may not be limited in shape, but required to have a dimension in any direction not exceeding 1/3 of the diameter of the steel pipe.
Step 2, after the steel pipe pile is statically pressed in a design position, a water jet pipe is placed into the steel pipe, which is used to rinse off soil on the inner wall of the steel pipe under a water jet pressure of 0.1-0.2 MPa. Then, the soil that passes through the holes in the wall of the pipe into the steel pipe during the pile pressing is cleared away by means of water pressure.
Step 3, finished deformed steel bars and a grouting pipe are placed into the steel pipe pile simultaneously after the steel pipe is internally cleaned up. Cement grout is injected from the bottom by means of the weight of the grout, and the grouting pipe is lifted while grouting until the steel pipe is full of the grout. The finished deformed steel bar may have a diameter of 25-50 mm and ultimate strength of 400-800 MPa. When placed, the finished deformed steel bars may be fixed by retaining rings. The retaining rings may be disposed every 4-6 m. The injected grout may have a water-to-cement ratio of 0.5-0.8.
Step 4, a grouting nozzle on which a valve is disposed is mounted at the upper end of the pressed-in steel pipe pile, and then a first stage of pressure grouting is started, which is finished until the volume of the injected grout is twice that of the steel pipe, where the grouting pressure may be controlled to a range of 0.4-0.8 MPa, and held statically for 10-15 minutes after the grouting is finished.
Step 5, a second stage of pressure grouting is started, which is finished until the total volume of the injected grout is triple that of the steel pipe, where the grouting pressure may be controlled to a range of 2-4 MPa, and the grouting valve may be closed to keep static for 15-30 minutes after the grouting is finished.
Step 6, the grouting nozzle is removed, and the pile tip of the steel pipe pile is cleaned up immediately. Then, a sealing plate and nuts are mounted.
Step 7, protection nuts are removed, and a concrete foundation is cast. Thus, the construction is completed.
Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.
While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. It will be apparent to a person skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the invention. Thus, the present invention should not be limited by any of the above described exemplary embodiments.
Claims (5)
1. A construction method of static pressing and post-grouting for a small-diameter mini-sized steel pipe pile, specifically comprising the following steps:
step 1, cutting a small-diameter steel pipe into segments on site, and forming holes in the wall of the pipe, wherein the steel pipe pile has a diameter of 70-140 mm, and each steel pipe segment has a length of 3-6 m, while the pile foundation has an overall length of 9-15m; statically pressing the steel pipe segments into the soil one by one after the completion of processing of each segment; connecting different steel pipe segments by welding or by means of sleeves, and welding a pile tip to the bottom of the steel pipe;
step 2, placing a water jet pipe into the steel pipe after the steel pipe pile is statically pressed in a design position, and clearing away the soil that passes through the holes in the wall of the pipe into the steel pipe during the pile pressing by means of water pressure;
step 3, placing finished deformed steel bars and a grouting pipe into the steel pipe pile simultaneously after the steel pipe is internally cleaned up; injecting cement grout from the bottom by means of the weight of the grout, and lifting the grouting pipe while grouting until the steel pipe is full of the grout;
step 4, mounting a grouting nozzle on which a valve is disposed at the upper end of the pressed-in steel pipe pile, and then starting a first stage of pressure grouting, which is finished until the volume of the injected grout is twice that of the steel pipe;
step 5, starting a second stage of pressure grouting, which is finished until the total volume of the injected grout is triple that of the steel pipe;
step 6, removing the grouting nozzle, cleaning up the pile tip of the steel pipe pile, and then mounting a sealing plate and nuts; and
step 7, removing protection nuts, and casting a concrete foundation, thus completing the construction.
2. The construction method according to claim 1, wherein in the step 1, different steel pipe segments are connected by means of sleeves or by welding in case of a pile diameter of not more than 100 mm, and welded together in case of a pile diameter of more than 100 mm;
wherein in the step 1, the hole position in the wall of the steel pipe is within 2/3 of the overall length of the pile body from the pile tip in the vertical direction; holes are symmetrically formed in
1-2 positions in the wall of each steel pipe segment, and each hole is not limited in shape, but required to have a dimension in any direction not exceeding 1/3 of the diameter of the steel pipe;
wherein in the step 1, an end plate of the pile tip has a diameter 1.3-1.5 times that of the steel pipe.
3. The construction method according to claim 1, wherein in the step 2, the water jet pipe is used to rinse off soil on the inner wall of the steel pipe under a water jet pressure of 0.1-0.2 MPa;
wherein in the step 3, the finished deformed steel bar has a diameter of 25-50 mm and ultimate strength of 400-800 MPa;
wherein in the step 3, when placed, the finished deformed steel bars are fixed by retaining rings; and the retaining rings are disposed every 4-6 m.
4. The construction method according to claim 1, wherein the injected grout has a water-to cement ratio of 0.5-0.8.
5. The construction method according to claim 1, wherein in the step 4, a grouting pressure in the first stage of pressure grouting is controlled to a range of 0.4-0.8 MPa, and held statically for -15 minutes after the grouting is finished;
wherein in the step 5, a grouting pressure in the second stage of pressure grouting is controlled to a range of 2-4 MPa, and the grouting valve is closed to keep static for 15-30 minutes after the grouting is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100056A AU2021100056A4 (en) | 2021-01-06 | 2021-01-06 | Construction method of static pressing and post-grouting for small-diameter mini-sized steel pipe pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100056A AU2021100056A4 (en) | 2021-01-06 | 2021-01-06 | Construction method of static pressing and post-grouting for small-diameter mini-sized steel pipe pile |
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| AU2021100056A4 true AU2021100056A4 (en) | 2021-03-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481973A (en) * | 2021-06-10 | 2021-10-08 | 中铁三局集团广东建设工程有限公司 | Construction method of steel pipe pile of subway station |
| CN114319329A (en) * | 2021-12-24 | 2022-04-12 | 浙江固邦建筑特种技术有限公司 | Anchor rod static pressure mould pipe device and cast-in-place pile construction method |
-
2021
- 2021-01-06 AU AU2021100056A patent/AU2021100056A4/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113481973A (en) * | 2021-06-10 | 2021-10-08 | 中铁三局集团广东建设工程有限公司 | Construction method of steel pipe pile of subway station |
| CN114319329A (en) * | 2021-12-24 | 2022-04-12 | 浙江固邦建筑特种技术有限公司 | Anchor rod static pressure mould pipe device and cast-in-place pile construction method |
| CN114319329B (en) * | 2021-12-24 | 2023-10-03 | 浙江固邦建筑特种技术有限公司 | Anchor rod static pressure pipe pressing device and cast-in-place pile construction method |
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