CN113789779A - Pile foundation structure applied to soft soil foundation and coral sand foundation and construction method - Google Patents
Pile foundation structure applied to soft soil foundation and coral sand foundation and construction method Download PDFInfo
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- CN113789779A CN113789779A CN202111088406.6A CN202111088406A CN113789779A CN 113789779 A CN113789779 A CN 113789779A CN 202111088406 A CN202111088406 A CN 202111088406A CN 113789779 A CN113789779 A CN 113789779A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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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
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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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
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
Abstract
The invention provides a pile foundation structure applied to soft soil foundations and coral sand foundations and a construction method, wherein the pile foundation structure comprises a hollow prefabricated multiple cast-in-place pile, the hollow prefabricated multiple cast-in-place pile is prefabricated in a steel hollow mode, a prefabricated pile foundation framework surrounds the whole cement and hollow prefabricated pipes, the cross section of the pile is circular, the radius of the pile is R, a circular bottom pouring hole with the radius of R/10 is reserved in the center of the cross section, and a circular pipe and a side pouring hole with the diameter of R/20 are reserved at a position away from the edge of the cross section; also comprises a straight grouting pipe. This reducible expense cost of pile foundation, easy operation just is convenient for develop the implementation experiment, reduces the quantity of pile foundation, makes the weak soil durable fast, reaches the standard that can be under construction, can solve subsiding of pile foundation and building, is favorable to superstructure firm.
Description
Technical Field
The invention relates to a pile foundation structure applied to a soft soil foundation and a coral sand foundation and a construction method, and belongs to the technical field of pile foundation construction.
Background
In recent years, a great deal of civil engineering practice has promoted the development of the treatment technology of the soft soil foundation, and among various special soils in China, the soft soil is widely distributed in coastal plains, estuary delta, around lake basin lands and mountain valley lands in China. In the engineering construction of roads, bridges, buildings and the like, the pile foundation is widely applied, but the characteristics of the soft soil foundation cause that the load of the pile foundation cannot be well born, so that the soft soil foundation is firmer and the use of the pile foundation becomes a focus of attention of people. Therefore, how to form a pile foundation having a high strength on a soft soil foundation is a major problem in constructing buildings and road surfaces on a soft soil foundation. The existing problem that the settlement is easy to happen on the soft soil foundation and the coral sand foundation, so that the grouting and grouting are difficult and the cost is too high.
Disclosure of Invention
The invention aims to provide a device and a method for a pile foundation applied to a soft soil foundation and a coral sand foundation, wherein the pile foundation can reduce the cost, is simple to operate and convenient to develop and carry out experiments, reduces the number of the pile foundations, quickly leads the soft soil to be firm, reaches the construction standard, can solve the settlement of the pile foundation and a building, is beneficial to the stability of an upper building, can improve the stability of the pile foundation by combining the friction force of the pile foundation in all aspects, combines the advantages of a friction pile and an end bearing pile, reduces the settlement, has the advantages of reducing the cost, being beneficial to the smooth injection of slurry, achieving the purpose of quick construction, improving the efficiency of the engineering, being beneficial to the subsequent engineering, further improving the construction, increasing the bottom area, reducing the bottom pressure and reducing the settlement.
In order to achieve the technical features, the invention is realized as follows: a pile foundation structure applied to soft soil foundation and coral sand foundation comprises a hollow prefabricated multiple cast-in-place pile, wherein the hollow prefabricated multiple cast-in-place pile is prefabricated in a hollow way by steel, a prefabricated pile foundation framework surrounds the whole cement and hollow prefabricated pipe, the cross section of the pile is circular, the radius of the pile is R, a circular bottom cast-in-place hole with the radius of R/10 is reserved in the center of the cross section, and a circular pipe and a side cast-in-place hole with the diameter of R/20 are reserved at a position away from the edge of the cross section; also comprises a straight grouting pipe.
The side perfusion holes are formed by branch-shaped steel pipes, and the branch-shaped steel pipes are welded with the inclined steel pipes through the vertical steel pipes; the inclined steel pipe is directly communicated with the outside, and a plurality of fork structures are arranged on the inclined steel pipe, so that the integrity of the pile foundation is improved in the grouting process.
The bottom filling hole is composed of an R/10 vertical inner hollow round steel pipe, the bottom of the bottom filling hole is in a circular truncated cone shape and is directly communicated with the bottom of the bottom filling hole and is directly contacted with soft soil, the radius of a cylinder on the circular truncated cone is R/10, and the maximum radius of the bottom of the circular truncated cone is R/5.
The straight slip casting pipe comprises straight tube, two pivots and two iron sheets, thereby vertical circular slip casting straight tube combines the pivot to reach through the angle that manual regulation changed the iron sheet and changes the slip casting area, and the bottom pivot reduces the frictional force with the weak soil, forms a lot of slip casting pipe that can freely change the angle size.
The bottom filling hole is through changing the dynamics increase surface area slip casting many times, and the pipe is taken out the sanitization every time the slip casting is accomplished, and the soft mud compaction of the bottom of being convenient for makes the pile foundation effectively subside, and is constantly crowded densely, and the pipe is taken out every time the slip casting is accomplished, the going on of slip casting next time of being convenient for.
The grouting slurry is expanded cement slurry, surrounding soft soil is effectively squeezed, surrounding soil settlement is reduced, and finally all gaps are filled with expanded cement and are compacted.
A construction method of a pile foundation structure applied to a soft soil foundation and a coral sand foundation comprises the following steps:
aiming at the soft soil foundation:
step 1: the prepared material is as follows: the method comprises the following steps of prefabricating a multi-time cast-in-place pile in a hollow manner, wherein the pile comprises a branch-shaped steel pipe, a straight grouting pipe, three different steel circular pipes and two rotating shafts;
step 2: and (3) formwork support: a central pipeline and a side pipeline are reserved in the pipe, if the cross section of the pile is circular and the diameter of the pile is R, a circular bottom perfusion hole with the radius of R/10 is reserved in the center of the cross section, and a plastic circular pipe and a side perfusion pipe with the diameter of R/20 are reserved at the position 10cm away from the edge of the cross section;
step 3: pouring the pile body: firstly, using cement to pour and solidify the cement in step1, compacting the cement, covering the side grouting holes and the central grouting hole, reducing the injection of the cement into the pipeline, and waiting for the solidification of the pile foundation;
step 4: pile hole: drilling the soil by using a percussion drill, vertically driving the pile foundation into the soil by using a ramming machine, filling the gap of the pile foundation with the soil, and firmly filling the gap;
step 5: debris extraction: pumping out mud in the round hole by using a sand pump, checking whether the mud is pumped out completely and checking whether the mud is blocked, and compacting the bottom;
step 6: side surface symmetrical grouting: symmetrically grouting is carried out, equipment pressure is injected with expansion cement, the number of pipes can be adjusted according to the actual condition, the side pipelines are filled with the expansion cement at one time, and the expansion cement is compacted;
step 7: repeating step5, symmetrically grouting by the step two, performing the next grouting by the same method, completely filling the side grouting pipes, and compacting;
step 8: grouting at the bottom: the bottom grouting hole changes the opening angle of the iron sheet of the straight grouting pipe through the rotating shaft to achieve multiple times of grouting, the opening area of the bottom of the grouting pipe extending into the grouting hole is changed to perform grouting, the pipe is drawn out after each time of grouting, the next grouting is facilitated, and the pipeline is dredged by a pipeline dredging machine after each time of grouting;
step 9: repeating step7 for many times to carry out grouting, changing the opening area of the bottom of the grouting pipe of the grouting hole which stretches into each time, and adjusting the grouting times according to the actual situation;
step 10: backfilling: filling the remaining gaps and continuously compacting.
A construction method of a pile foundation structure applied to a soft soil foundation and a coral sand foundation comprises the following steps:
aiming at coral sand foundation:
step 1: the prepared material is as follows: the method comprises the following steps of (1) prefabricating a branch-shaped steel pipe, a straight grouting pipe, three different steel circular pipes, two rotating shafts, a multiple cast-in-place pile and iron sheets in a hollow manner;
step 1: and (3) formwork support: firstly, reserving a central pipeline and a side pipeline pile in the pipe, wherein the cross section of the pile is circular, the diameter of the pile is R, a circular bottom perfusion hole with the radius of R/10 is reserved in the center of the cross section, and a plastic circular pipe and a side perfusion pipe with the diameter of R/20 are reserved at a position 10cm away from the edge of the cross section;
step 2: pouring the pile body: firstly, using cement to pour and solidify the cement in step1, compacting the cement, covering the side grouting holes and the central grouting hole, reducing the injection of the cement into the pipeline, and waiting for the solidification of the pile foundation;
step 3: pile hole: drilling the soil by using a percussion drill, vertically driving the pile foundation into the soil by using a ramming machine, filling the gap of the pile foundation with the soil, and firmly filling the gap;
step 4: debris extraction: after the pile foundation is driven into, soil enters the pipeline, the soil in the pipeline is pumped out to prevent blockage, the sand in the round hole is pumped out by a sand pump, whether the soil is pumped out and blocked is checked, and the bottom is compacted
Step 5: side surface symmetrical grouting: filling the side pipelines with the expansion cement at one time and filling the side pipelines with the expansion cement at one time through symmetrical grouting and compacting the side pipelines
Step 6: grouting at the bottom: filling a part of the bottom by using a pipeline, then filling the rest base pictures at one time, and drawing out and filling the pipes after filling each time;
step 7: backfilling: filling the remaining gaps and continuously compacting.
The invention has the following beneficial effects:
1. the hollow pipeline formwork is manufactured, so that a hollow pile foundation is convenient to form, a grouting space is reserved for the pile foundation, subsequent grouting is convenient, and multiple times of grouting can be implemented.
2. The purpose of multiple times of grouting is achieved by adjusting the opening size of the iron sheet through the rotating shaft device, the surface area is increased, the pressure is reduced, the bottom soil is extruded and firmed for multiple times, the settlement is reduced, the bottom is firmer, and the building is easier to support.
3. The expansion cement mortar is injected for many times, so that the deformation of the soft soil is large, and the stability of the soft soil can not be ensured by one-time grouting, so that the soft soil can be stabilized again on the basis of one-time grouting by using the multiple-time grouting, and the effect of strengthening the hardness of the deep soft soil is achieved.
4. The soft soil is more compacted by grouting around the pile foundation, the gaps are reduced, the soft soil and the surrounding soil form a whole, the surrounding extrusion solidification increases the friction force, and the settlement is reduced
5. During grouting, the shape design in the side reserved pipe meets the gravity condition, so that the grouting operation is facilitated, the rapid grouting is facilitated, and the efficiency is improved.
6. Through changing different area at every turn and slip casting to the bottom many times, slip casting many times can make the bottom constantly extrude durable, makes the abundant earth with the bottom of inflation cement combine to form a whole, reduces and subsides.
7. And the lateral grouting pipes are symmetrically used for grouting, so that the stress of the pile foundation is balanced, the inclination of the pile foundation is reduced, and the subsequent implementation of grouting is facilitated.
8. The gap is filled, so that the toughness of the pile foundation is improved, the pile foundation can be used in various fields, unnecessary waste caused by settlement is reduced, and subsequent work of the foundation can be conveniently carried out
9. The design of side slip casting pipe can carry out the slip casting through different injected holes, need not consider whether it plugs up the slip casting pipeline.
10. The design of side slip casting hole is many forks structure, can improve the wholeness of whole pile foundation when making the slip casting.
11. The pile foundation does not need to be driven into the ground at one time, and sinks by utilizing the lifting of the self gravity after multiple times of grouting, and the bearing capacity and the friction force of the pile foundation are continuously improved by the method.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a hollow prefabricated multiple cast-in-place pile of the invention.
Fig. 2 shows the pile of the present invention after casting.
FIG. 3 is a dendritic steel pipe of the present invention.
Fig. 4 is a top view of the pile foundation of the present invention.
Fig. 5 is a front view of the straight grout pipe of the present invention.
Fig. 6 is a side view of a straight grout pipe of the present invention.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-6, a pile foundation structure for soft soil foundation and coral sand foundation, its characterized in that: the pile comprises a hollow prefabricated multiple cast-in-place pile 5, wherein the hollow prefabricated multiple cast-in-place pile 5 is prefabricated in a hollow way by steel, a prefabricated pile foundation framework surrounds the whole cement and hollow prefabricated pipes, the cross section of the pile is circular, the radius of the pile is R, a circular bottom cast-in-place hole with the radius of R/10 is reserved in the center of the cross section, and a circular pipe 3 and a side cast-in-place hole with the diameter of R/20 are reserved at a position away from the edge of the cross section; a straight grouting pipe 2 is also included.
Further, the side perfusion holes are composed of dendritic steel pipes 1, and the dendritic steel pipes 1 are welded with the inclined steel pipes through vertical steel pipes; the inclined steel pipe is directly communicated with the outside, and a plurality of fork structures are arranged on the inclined steel pipe, so that the integrity of the pile foundation is improved in the grouting process.
Furthermore, the bottom filling hole is composed of an R/10 vertical inner hollow round steel pipe, the bottom of the bottom filling hole is in a circular truncated cone shape and is directly communicated with the bottom of the bottom filling hole and directly contacted with soft soil, the radius of a cylinder on the circular truncated cone is R/10, and the maximum radius of the bottom of the circular truncated cone is R/5.
Further, straight slip casting pipe 2 comprises straight tube, two pivots 4 and two iron sheets 6, thereby vertical circular slip casting straight tube combines the pivot to reach through the angle that manual regulation changed the iron sheet and changes the slip casting area, and the bottom pivot reduces the frictional force with the weak soil, forms a lot of slip casting pipe that can freely change the angle size.
Furthermore, the bottom filling hole is through changing the dynamics increase surface area slip casting many times, and the pipe is taken out the sanitization after the slip casting at every turn, and the soft mud of the bottom of being convenient for is crowded densely, makes the pile foundation effectively subside, and is constantly crowded densely, and the pipe is taken out after the slip casting at every turn, the going on of slip casting next time of being convenient for.
Furthermore, the grouting slurry is expanded cement slurry, surrounding soft soil is effectively squeezed, surrounding soil settlement is reduced, and finally all gaps are filled with the expanded cement and are compacted.
Example 2:
a construction method of a pile foundation structure applied to a soft soil foundation and a coral sand foundation comprises the following steps:
aiming at the soft soil foundation:
step 1: the prepared material is as follows: the method comprises the following steps that (1) a branch-shaped steel pipe, a straight grouting pipe 2, three different steel circular pipes, two rotating shafts and a hollow prefabricated multiple cast-in-place pile 5 are arranged;
step 2: and (3) formwork support: a central pipeline and a side pipeline are reserved in the pipe, if the cross section of the pile is circular and the diameter of the pile is R, a circular bottom perfusion hole with the radius of R/10 is reserved in the center of the cross section, and a plastic circular pipe and a side perfusion pipe with the diameter of R/20 are reserved at the position 10cm away from the edge of the cross section;
step 3: pouring the pile body: firstly, using cement to pour and solidify the cement in step1, compacting the cement, covering the side grouting holes and the central grouting hole, reducing the injection of the cement into the pipeline, and waiting for the solidification of the pile foundation;
step 4: pile hole: drilling the soil by using a percussion drill, vertically driving the pile foundation into the soil by using a ramming machine, filling the gap of the pile foundation with the soil, and firmly filling the gap;
step 5: debris extraction: pumping out mud in the round hole by using a sand pump, checking whether the mud is pumped out completely and checking whether the mud is blocked, and compacting the bottom;
step 6: side surface symmetrical grouting: symmetrically grouting is carried out, equipment pressure is injected with expansion cement, the number of pipes can be adjusted according to the actual condition, the side pipelines are filled with the expansion cement at one time, and the expansion cement is compacted;
step 7: repeating step5, symmetrically grouting by the step two, performing the next grouting by the same method, completely filling the side grouting pipes, and compacting;
step 8: grouting at the bottom: the bottom grouting hole changes the opening angle of the iron sheet of the straight grouting pipe through the rotating shaft to achieve multiple times of grouting, the opening area of the bottom of the grouting pipe extending into the grouting hole is changed to perform grouting, the pipe is drawn out after each time of grouting, the next grouting is facilitated, and the pipeline is dredged by a pipeline dredging machine after each time of grouting;
step 9: repeating step7 for many times to carry out grouting, changing the opening area of the bottom of the grouting pipe of the grouting hole which stretches into each time, and adjusting the grouting times according to the actual situation;
step 10: backfilling: filling the remaining gaps and continuously compacting.
Example 3:
a construction method of a pile foundation structure applied to a soft soil foundation and a coral sand foundation comprises the following steps:
aiming at coral sand foundation:
step 1: the prepared material is as follows: the method comprises the following steps of (1) prefabricating a branch-shaped steel pipe, a straight grouting pipe, three different steel circular pipes, two rotating shafts, a multiple cast-in-place pile and iron sheets in a hollow manner;
step 1: and (3) formwork support: firstly, reserving a central pipeline and a side pipeline pile in the pipe, wherein the cross section of the pile is circular, the diameter of the pile is R, a circular bottom perfusion hole with the radius of R/10 is reserved in the center of the cross section, and a plastic circular pipe and a side perfusion pipe with the diameter of R/20 are reserved at a position 10cm away from the edge of the cross section;
step 2: pouring the pile body: firstly, using cement to pour and solidify the cement in step1, compacting the cement, covering the side grouting holes and the central grouting hole, reducing the injection of the cement into the pipeline, and waiting for the solidification of the pile foundation;
step 3: pile hole: drilling the soil by using a percussion drill, vertically driving the pile foundation into the soil by using a ramming machine, filling the gap of the pile foundation with the soil, and firmly filling the gap;
step 4: debris extraction: after the pile foundation is driven into, soil enters the pipeline, the soil in the pipeline is pumped out to prevent blockage, the sand in the round hole is pumped out by a sand pump, whether the soil is pumped out and blocked is checked, and the bottom is compacted
Step 5: side surface symmetrical grouting: filling the side pipelines with the expansion cement at one time and filling the side pipelines with the expansion cement at one time through symmetrical grouting and compacting the side pipelines
Step 6: grouting at the bottom: filling a part of the bottom by using a pipeline, then filling the rest base pictures at one time, and drawing out and filling the pipes after filling each time;
step 7: backfilling: filling the remaining gaps and continuously compacting.
Claims (8)
1. The utility model provides a be applied to pile foundation structure of soft soil foundation and coral sand foundation which characterized in that: the prefabricated hollow multi-cast-in-place pile comprises a hollow prefabricated multi-cast-in-place pile (5), wherein the hollow prefabricated multi-cast-in-place pile (5) is prefabricated in a steel hollow mode, a prefabricated pile foundation framework surrounds the whole cement and hollow prefabricated pipes, the cross section of the pile is circular, the radius of the pile is R, a circular bottom cast-in-place hole with the radius of R/10 is reserved in the center of the cross section, and a circular pipe (3) and a side cast-in-place hole with the diameter of R/20 are reserved at a position away from the edge of the cross section; also comprises a straight grouting pipe (2).
2. The pile foundation structure applied to the soft soil foundation and the coral sand foundation of claim 1, wherein: the side perfusion holes are formed by branch-shaped steel pipes (1), and the branch-shaped steel pipes (1) are welded with the inclined steel pipes through vertical steel pipes; the inclined steel pipe is directly communicated with the outside, and a plurality of fork structures are arranged on the inclined steel pipe, so that the integrity of the pile foundation is improved in the grouting process.
3. The pile foundation structure applied to the soft soil foundation and the coral sand foundation of claim 1, wherein: the bottom filling hole is composed of an R/10 vertical inner hollow round steel pipe, the bottom of the bottom filling hole is in a circular truncated cone shape and is directly communicated with the bottom of the bottom filling hole and is directly contacted with soft soil, the radius of a cylinder on the circular truncated cone is R/10, and the maximum radius of the bottom of the circular truncated cone is R/5.
4. The pile foundation structure applied to the soft soil foundation and the coral sand foundation of claim 1, wherein: the straight grouting pipe (2) is composed of a straight pipe, two rotating shafts (4) and two iron sheets (6), the vertical round grouting straight pipe is combined with the rotating shaft, the angle of the iron sheets can be changed through manual adjustment, so that the grouting area can be changed, the rotating shaft at the bottom reduces the friction force with soft soil, and a plurality of grouting pipes capable of freely changing the angle are formed.
5. The pile foundation structure applied to the soft soil foundation and the coral sand foundation of claim 1, wherein: the bottom filling hole is through changing the dynamics increase surface area slip casting many times, and the pipe is taken out the sanitization every time the slip casting is accomplished, and the soft mud compaction of the bottom of being convenient for makes the pile foundation effectively subside, and is constantly crowded densely, and the pipe is taken out every time the slip casting is accomplished, the going on of slip casting next time of being convenient for.
6. The pile foundation structure applied to the soft soil foundation and the coral sand foundation of claim 1, wherein: the grouting slurry is expanded cement slurry, surrounding soft soil is effectively squeezed, surrounding soil settlement is reduced, and finally all gaps are filled with expanded cement and are compacted.
7. The method for constructing a pile foundation structure for a soft soil foundation and a coral sand foundation as claimed in any one of claims 1 to 6, comprising the steps of:
aiming at the soft soil foundation:
step 1: the prepared material is as follows: the system comprises a branch-shaped steel pipe (1), a straight grouting pipe (2), three different steel circular pipes, two rotating shafts and a hollow prefabricated multiple cast-in-place pile (5);
step 2: and (3) formwork support: a central pipeline and a side pipeline are reserved in the pipe, if the cross section of the pile is circular and the diameter of the pile is R, a circular bottom perfusion hole with the radius of R/10 is reserved in the center of the cross section, and a plastic circular pipe and a side perfusion pipe with the diameter of R/20 are reserved at the position 10cm away from the edge of the cross section;
step 3: pouring the pile body: firstly, using cement to pour and solidify the cement in step1, compacting the cement, covering the side grouting holes and the central grouting hole, reducing the injection of the cement into the pipeline, and waiting for the solidification of the pile foundation;
step 4: pile hole: drilling the soil by using a percussion drill, vertically driving the pile foundation into the soil by using a ramming machine, filling the gap of the pile foundation with the soil, and firmly filling the gap;
step 5: debris extraction: pumping out mud in the round hole by using a sand pump, checking whether the mud is pumped out completely and checking whether the mud is blocked, and compacting the bottom;
step 6: side surface symmetrical grouting: symmetrically grouting is carried out, equipment pressure is injected with expansion cement, the number of pipes can be adjusted according to the actual condition, the side pipelines are filled with the expansion cement at one time, and the expansion cement is compacted;
step 7: repeating step5, symmetrically grouting by the step two, performing the next grouting by the same method, completely filling the side grouting pipes, and compacting;
step 8: grouting at the bottom: the bottom grouting hole changes the opening angle of the iron sheet of the straight grouting pipe through the rotating shaft to achieve multiple times of grouting, the opening area of the bottom of the grouting pipe extending into the grouting hole is changed to perform grouting, the pipe is drawn out after each time of grouting, the next grouting is facilitated, and the pipeline is dredged by a pipeline dredging machine after each time of grouting;
step 9: repeating step7 for many times to carry out grouting, changing the opening area of the bottom of the grouting pipe of the grouting hole which stretches into each time, and adjusting the grouting times according to the actual situation;
step 10: backfilling: filling the remaining gaps and continuously compacting.
8. The method for constructing a pile foundation structure for a soft soil foundation and a coral sand foundation as claimed in any one of claims 1 to 6, comprising the steps of:
aiming at coral sand foundation:
step 1: the prepared material is as follows: the method comprises the following steps of (1) prefabricating a branch-shaped steel pipe, a straight grouting pipe, three different steel circular pipes, two rotating shafts, a multiple cast-in-place pile and iron sheets in a hollow manner;
step 1: and (3) formwork support: firstly, reserving a central pipeline and a side pipeline pile in the pipe, wherein the cross section of the pile is circular, the diameter of the pile is R, a circular bottom perfusion hole with the radius of R/10 is reserved in the center of the cross section, and a plastic circular pipe and a side perfusion pipe with the diameter of R/20 are reserved at a position 10cm away from the edge of the cross section;
step 2: pouring the pile body: firstly, using cement to pour and solidify the cement in step1, compacting the cement, covering the side grouting holes and the central grouting hole, reducing the injection of the cement into the pipeline, and waiting for the solidification of the pile foundation;
step 3: pile hole: drilling the soil by using a percussion drill, vertically driving the pile foundation into the soil by using a ramming machine, filling the gap of the pile foundation with the soil, and firmly filling the gap;
step 4: debris extraction: after the pile foundation is driven into, soil enters the pipeline, the soil in the pipeline is pumped out to prevent blockage, the sand in the round hole is pumped out by a sand pump, whether the soil is pumped out and blocked is checked, and the bottom is compacted
Step 5: side surface symmetrical grouting: filling the side pipelines with the expansion cement at one time and filling the side pipelines with the expansion cement at one time through symmetrical grouting and compacting the side pipelines
Step 6: grouting at the bottom: filling a part of the bottom by using a pipeline, then filling the rest base pictures at one time, and drawing out and filling the pipes after filling each time;
step 7: backfilling: filling the remaining gaps and continuously compacting.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457833A (en) * | 2022-02-21 | 2022-05-10 | 三峡大学 | Pile foundation structure capable of being strengthened on coral sand and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB669661A (en) * | 1949-08-12 | 1952-04-09 | Harold Franklin Rosevear | Improvements relating to concrete piles |
| CN107338804A (en) * | 2017-06-13 | 2017-11-10 | 安徽建工集团有限公司 | A kind of hollow independent composite pile foundation of super-large diameter and its method of construction |
| CN110318390A (en) * | 2019-08-05 | 2019-10-11 | 沈阳建筑大学 | Prefabricated grouting behind shaft or drift lining bamboo joint pile and its construction method |
| CN211640425U (en) * | 2019-12-09 | 2020-10-09 | 中煤建工集团有限公司 | Thixotropic slurry grouting structure |
-
2021
- 2021-09-16 CN CN202111088406.6A patent/CN113789779B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB669661A (en) * | 1949-08-12 | 1952-04-09 | Harold Franklin Rosevear | Improvements relating to concrete piles |
| CN107338804A (en) * | 2017-06-13 | 2017-11-10 | 安徽建工集团有限公司 | A kind of hollow independent composite pile foundation of super-large diameter and its method of construction |
| CN110318390A (en) * | 2019-08-05 | 2019-10-11 | 沈阳建筑大学 | Prefabricated grouting behind shaft or drift lining bamboo joint pile and its construction method |
| CN211640425U (en) * | 2019-12-09 | 2020-10-09 | 中煤建工集团有限公司 | Thixotropic slurry grouting structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457833A (en) * | 2022-02-21 | 2022-05-10 | 三峡大学 | Pile foundation structure capable of being strengthened on coral sand and method |
| CN114457833B (en) * | 2022-02-21 | 2024-03-12 | 三峡大学 | Pile foundation structure capable of being reinforced on coral sand and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113789779B (en) | 2022-08-30 |
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