CN108999227B - Reinforcing structure of building foundation and construction method thereof - Google Patents

Reinforcing structure of building foundation and construction method thereof Download PDF

Info

Publication number
CN108999227B
CN108999227B CN201811205860.3A CN201811205860A CN108999227B CN 108999227 B CN108999227 B CN 108999227B CN 201811205860 A CN201811205860 A CN 201811205860A CN 108999227 B CN108999227 B CN 108999227B
Authority
CN
China
Prior art keywords
protective
pipe
steel pipe
pile
static pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811205860.3A
Other languages
Chinese (zh)
Other versions
CN108999227A (en
Inventor
郑佳伟
王艺放
李治明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cnnc Star Construction Project Management Co ltd
Original Assignee
Cnnc Star Construction Project Management Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cnnc Star Construction Project Management Co ltd filed Critical Cnnc Star Construction Project Management Co ltd
Priority to CN201811205860.3A priority Critical patent/CN108999227B/en
Publication of CN108999227A publication Critical patent/CN108999227A/en
Application granted granted Critical
Publication of CN108999227B publication Critical patent/CN108999227B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D37/00Repair of damaged foundations or foundation structures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/20Placing by pressure or pulling power

Abstract

The invention relates to the field of building foundation reinforcement, in particular to a reinforcing structure of a building foundation, which comprises a static pressure pile, a pile head and a cement reinforcing layer, wherein an expansion piece with thick middle part and thin upper part and lower part is fixedly arranged between the static pressure pile and the pile head; a protective pipe is vertically sleeved on the outer side of the static pressure pile; the outer diameter of the protective pipe is smaller than the maximum cross section of the expansion piece; the inner diameter of the protective pipe is larger than the cross section of the static pressure pile, so that cement slurry is poured into a cavity between the protective pipe and the static pressure pile to form a cement protective layer; the construction method comprises the steps of digging a pit, pressing a steel pipe and a protective pipe in a segmented mode, pouring cement paste in the steel pipe and the protective pipe, and finally pouring concrete in the reinforced pit and backfilling the concrete to the ground to form a bearing platform; the method has the advantages of low construction operation difficulty and improvement of the durability of the static pressure pile.

Description

Reinforcing structure of building foundation and construction method thereof
Technical Field
The invention relates to the technical field of building foundation reinforcement, in particular to a reinforcement structure of a building foundation and a construction method thereof.
Background
The existing building foundation reinforcement reasons include insufficient bearing capacity of the building foundation, construction influence of newly-built adjacent buildings, underground water level reduction, unqualified pile foundation quality, small number of detection points of foundation survey, error analysis on soil layers and the like, and the factors cause cracks of building walls, foundation settlement and other quality problems, so that the building cannot meet functional requirements, and the safety of users is seriously threatened. If the existing building is removed and rebuilt, huge funds are wasted, and the economic benefit is not cost-effective. By adopting the method of foundation reinforcement, the problem of the foundation can be solved, and the cost can be saved. Therefore, many construction units adopt a foundation reinforcement method to solve the problem.
In the prior art, a plurality of building foundation reinforcing methods are adopted, pit type static pressure pile top protection is a reinforcing method which is widely applied, the principle is that in an excavated pit, the self weight of the upper structure of the building is used as a supporting counter force, a jack is used for pressing a steel pipe into soil section by section, and then concrete is poured into the steel pipe to play a role in reinforcing. The method can effectively improve the bearing capacity of the building foundation and prevent the uneven settlement of the building.
However, the conventional pit type hydrostatic pressure pile top protection still has the following problems: 1. when a steel pipe static pressure pile is adopted in the self-weight collapsible loess foundation or the large-thickness soil filling foundation, because the friction resistance of a pile body (steel pipe) is large, the pile body must penetrate through the self-weight collapsible loess foundation or the large-thickness soil filling layer to enter a better bearing layer, the length of the pile body is often long, when the counter-force of the pressure pile is insufficient, for example, the self-weight of a two-layer small building is too small, the large-diameter steel pipe pile needs very large counter-force and the like, the construction of the pressure pile is often difficult to realize, and the design requirements are difficult to meet; 2. the steel pipe pile is buried in a foundation soil layer for a long time, and the problem of corrosion and rust exists, so that the durability of the steel pipe pile cannot be guaranteed; 3. the end faces are directly in butt contact welding during steel pipe welding, the contact area is small, and the welding operation difficulty is high.
Disclosure of Invention
In view of the defects of the prior art, the first object of the invention is to provide a reinforcement structure of a building foundation, which reduces the difficulty of construction operation and improves the durability of a static pressure pile.
The first purpose of the invention is realized by the following technical scheme:
a reinforced structure of a building foundation comprises a static pressure pile, a pile head and a cement reinforced layer, wherein the upper end of the static pressure pile is fixedly arranged at the bottom end of the building foundation, the lower end of the static pressure pile is fixedly connected with the pile head, the bottom end of the pile head extends into soil below the foundation, the cement reinforced layer is arranged between the static pressure pile and the surrounding soil, an expansion piece for expanding the inner diameter of a drilled hole of the pile head in the soil is fixedly arranged between the static pressure pile and the pile head, the expansion piece is of a structure with a thick middle part and a thin upper part and a thin lower part, the bottom end of the expansion piece is integrally and smoothly connected with the pile head, the top end of the expansion piece is fixedly connected with the bottom end of the static pressure pile, and the maximum cross section of the expansion piece is larger than that of the static pressure pile; a protective pipe is vertically sleeved on the outer side of the static pressure pile; the outer diameter of the protective pipe is smaller than the maximum cross section of the expansion piece; the inner diameter of the protective pipe is larger than the cross section of the static pressure pile, so that cement slurry is poured into a cavity between the protective pipe and the static pressure pile to form a cement protective layer.
By adopting the technical scheme, when the pile head drives the expansion piece and the static pressure pile to press into the foundation soil layer, the expansion piece with thick middle part and thin upper part and lower part expands the drilled hole into a hole with a diameter larger than that of the static pressure pile, and the protective pipe is sleeved outside the static pressure pile, so that the static pressure pile cannot generate friction resistance with the hole wall; and the external diameter of protective tube is less than the biggest cross section of holding member to make at the static pressure stake pushing down in-process, the frictional resistance greatly reduced that protective tube and drill hole wall contact and produce, thereby reduced the demand to the pile pressing counter-force, reduced the construction operation degree of difficulty. And cement slurry is poured in a cavity between the protective pipe and the static pressure pile to form a cement protective layer, so that the static pressure pile is wrapped in the cement protective layer, and a cement reinforcing layer is formed between the protective pipe and a surrounding soil layer, so that the dual protection effect on the static pressure pile is realized, the problem that the static pressure pile is corroded and rusted after being buried in soil for a long time is avoided, and the durability of the static pressure pile is improved.
Preferably, the protective pipe is uniformly provided with grouting holes, the grouting holes are used for injecting cement slurry injected into the protective pipe between the protective pipe and a surrounding soil layer to form the cement reinforcing layer, and the cement slurry injected into the protective pipe is filled in the cavity to form the cement protective layer.
By adopting the technical scheme, when grouting is carried out in the protective pipe, a cement protective layer can be formed between the protective pipe and the static pressure pile, cement paste is drilled out from a grouting hole and injected between the protective pipe and the surrounding soil layer to form a cement reinforcing layer, so that the protective pipe is integrally cast inside and outside, double protection and reinforcement effects are formed on the static pressure pile, the static pressure pile is effectively protected from being corroded, and the durability is improved; meanwhile, the protective pipe is equivalent to an anchor, so that the cement protective layer and the cement reinforcing layer are improved, and the overall structural strength of the reinforced structure is improved.
Preferably, the static pressure pile is obtained by sequentially welding a plurality of steel pipes and then pouring concrete reinforcing slurry into the steel pipes; the top end of each steel pipe forming the static pressure pile is integrally provided with a connecting component used for connecting an upper steel pipe and a lower steel pipe.
Preferably, the connecting assembly comprises a tubular inner sleeve and a tubular outer sleeve of which the bottom end is sealed, and a slot which is spliced with the steel pipe is formed between the inner sleeve and the outer sleeve.
By adopting the technical scheme, the adjacent steel pipes are connected by welding through the connecting assembly, the upper steel pipe is inserted into the slot of the connecting assembly on the lower steel pipe, and the upper steel pipe is supported by the lower steel pipe during welding, so that the difficulty of welding operation is reduced; meanwhile, the welding contact area of the joint of the adjacent steel pipes is increased, and the welding strength and the overall structural strength of the static pressure pile are ensured.
Preferably, the outer wall interval of endotheca is provided with first welding piece, the inner wall interval of overcoat is provided with the second welding piece, first welding piece sets up with the second welding piece is alternate.
By adopting the technical scheme, the upper steel pipe is inserted into the slot of the connecting component on the lower steel pipe, and the first welding block and the second welding block are melted, so that the upper steel pipe and the lower steel pipe are welded together, and the welding is convenient and rapid; and the first welding block and the second welding block clamp the steel pipe above in the middle, and after the steel pipe is melted, the gap between the steel pipe above and the slot is filled and blocked, so that the steel pipe is integrated with the connecting assembly, and the steel pipe below the steel pipe is integrated.
Preferably, constitute the equal vertical cover in the outside of every steel pipe of hydrostatic pile is equipped with the protective tube, the top an organic whole of protective tube is provided with coupling assembling, in the slot on the coupling assembling of the bottom matching of top protective tube inserted adjacent below protective tube, the bottom and the expansion piece fixed connection of the protective tube adjacent with the expansion piece.
By adopting the technical scheme, the upper protective pipe and the lower protective pipe are fixedly connected in an inserting mode.
A second object of the present invention is to provide a construction method of a reinforced structure of a building foundation, which can reduce the difficulty of construction operation by using the reinforced structure of the building foundation for construction.
The second purpose of the invention is realized by the following technical scheme:
a construction method of a reinforcement structure of a building foundation comprises the following operation steps:
(1) excavating a reinforcing pit, and extending the reinforcing pit to the position right below a building foundation;
(2) welding a first section of steel pipe on the expansion part with a pile head at the bottom end, sleeving a first section of protective pipe on the periphery of the first section of steel pipe, and welding the bottom end of the first section of protective pipe and the expansion part into a whole;
(3) inserting a pile head into soil below a foundation in a reinforced pit, placing a base plate at the top ends of a first section of steel pipe and a first section of protective pipe, arranging a jack between the base plate and a building foundation, and pressing the pile head, a containing part, the first section of steel pipe and the first section of protective pipe into the soil;
(4) taking down the jack and the backing plate, welding a second section of steel pipe at the upper end of the first section of steel pipe, placing the second section of protective pipe at the upper end of the first section of protective pipe, placing the backing plate at the top ends of the second section of steel pipe and the second section of protective pipe, arranging the jack between the backing plate and the building foundation, and pressing the second section of steel pipe and the second section of protective pipe into the soil;
(5) repeating the operation of the step (4) to complete the welding of the plurality of steel pipes and the plurality of protective pipes, wherein the top ends of the static pressure piles and the protective pipes are abutted against the bottom end of the building foundation;
(6) pouring cement paste into the static pressure pile; pouring cement slurry into the protective pipe through the grouting hole, so that a cement protective layer is formed between the static pressure pile and the protective pipe, and a cement reinforcing layer is formed between the protective pipe and a surrounding soil layer;
(7) and pouring a concrete bearing platform in the reinforced pit, fixedly connecting the bottom of the reinforced pit with the building foundation, and filling the reinforced pit to the ground.
By adopting the technical scheme, the protective pipe and the steel pipe are pressed into the soil layer together, the protective pipe can effectively protect the steel pipe and prevent soil particles from scattering and colliding with the steel pipe to wear the steel pipe in the pressing process; and the protective pipe can prevent from falling to between steel pipe and the drilling wall from the soil grain that the soil layer was scattered and cause the influence to the later stage slip casting at the in-process of pushing down, guarantees effectual slip casting volume.
Preferably, in the step (4), the welding of the second section of steel pipe to the upper end of the first section of steel pipe comprises the following specific operations: after a first welding block and a second welding block in the first section of steel pipe top end connecting assembly are heated and melted, the lower end of a second section of steel pipe is inserted into a slot in the top end of the first section of steel pipe, and the first section of steel pipe is connected with the second section of steel pipe in a welding mode.
Preferably, in the step (4), the step of arranging the second section of protective pipe at the upper end of the first section of protective pipe comprises the following specific operations: after a first welding block and a second welding block in the connecting component at the top end of the first section of protective pipe are heated and melted, the second section of protective pipe is sleeved in the periphery of the second section of steel pipe, the bottom end of the second section of protective pipe is inserted into a slot at the top end of the first section of protective pipe in a matching mode, and the first section of protective pipe is connected with the second section of protective pipe in a welding mode.
Through adopting above-mentioned technical scheme, weld adjacent protective tube as an organic whole, weld adjacent steel pipe as an organic whole.
Preferably, in the step (6), after the cement reinforcing layer and the cement protective layer are formed by pouring, a jack is arranged in the reinforcing pit to jack the bottom of the building foundation, and the space between the static pressure pile and the building foundation and the space between the protective pipe and the building foundation are filled by the support plate.
Through adopting above-mentioned technical scheme, make the building basis closely supported by the reinforced structure of bottom, improve and consolidate intensity and stability.
In conclusion, the invention has the following beneficial effects:
(1) the arrangement of the expansion piece ensures that the static pressure pile does not generate friction resistance with the wall of the hole, and reduces the friction resistance generated by the contact of the protective pipe and the wall of the hole, thereby reducing the requirement on counter-force of pile pressing and reducing the difficulty of construction operation;
(2) the arrangement of the protective pipe realizes the double protection effect on the static pressure pile, and avoids the problem that the static pressure pile is corroded and rusted when being buried in soil for a long time, thereby improving the durability of the static pressure pile;
(3) the protective pipe can effectively prevent soil particles scattered by the soil layer from falling between the steel pipe and the wall of the drill hole to influence later grouting in the process that the static pressure pile is pressed into the soil layer, so that the effective grouting volume of grouting reinforcement is ensured, and the structural strength is improved;
(4) due to the arrangement of the connecting assembly, when the upper steel pipe is welded with the lower steel pipe, the upper steel pipe is supported by the lower steel pipe, so that the difficulty of welding operation is reduced; meanwhile, the welding contact area of the joint of the adjacent steel pipes is increased, and the welding strength and the overall structural strength of the static pressure pile are ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a hydrostatic pile;
fig. 3 is a schematic top view of the hydrostatic pile.
Reference numerals: 11. a steel pipe; 2. a protective tube; 3. a container; 4. pile head; 5. a cement reinforcing layer; 6. a cement protective layer; 7. a support plate; 8. grouting holes; 10. a surrounding soil layer; 12. a slot; 121. an inner sleeve; 122. a jacket; 13. a first welding block; 14. a second welding block; 20. a building foundation; 21. a foundation; 22. a ground surface; 23. reinforcing the pit; 25. concrete bearing platform.
Detailed Description
A reinforced structure of a building foundation is shown in figures 1 and 2 and comprises a static pressure pile formed by welding a plurality of steel pipes 11 end to end, a protective pipe 2 concentrically and vertically sleeved outside each steel pipe 11 of the static pressure pile, a thick and thin expansion piece 3 welded at the bottom of the static pressure pile and the protective pipe 2, a pile head 4 welded at the bottom end of the expansion piece 3 smoothly, a cement reinforcing layer 5 arranged between the protective pipe 2 and a surrounding soil layer 10 and a cement protective layer 6 filled between the protective pipe 2 and the static pressure pile. Concrete reinforcing slurry is poured into the steel pipes 11 forming the static pressure pile to obtain the static pressure pile with reinforcing filling, and the protective pipes 2 are welded into a whole end to end. The supporting plate 7 is filled between the upper end of the static pressure pile and the protecting pipe 2 and the bottom end of the building foundation 20, and the bottom end of the pile head 4 extends into the soil below the foundation 21. The maximum cross section of the expansion part 3 is larger than the cross sections of the static pressure pile and the protective pipe 2, namely the maximum cross section is larger than the outer diameters of the steel pipe 11 and the protective pipe 2; the inner diameter of the protective pipe 2 is larger than the cross section of the static pressure pile, namely, the outer diameter of the steel pipe 11, so that a cavity is formed between the protective pipe 2 and the steel pipe 11, and a cement protective layer 6 is formed by pouring cement slurry in the cavity. The protective pipe 2 is evenly provided with grouting holes 8, and when cement slurry is injected into the protective pipe 2 through the grouting holes 8, the cement slurry is injected between the protective pipe 2 and the surrounding soil layer 10 to form a cement reinforcing layer 5.
As shown in fig. 3, the top end of each steel pipe 11 constituting the static pressure pile is integrally provided with a slot 12 for connecting the upper and lower steel pipes 11, and the slot 12 is enclosed by a tubular inner sleeve 121 and an outer sleeve 122 with sealed bottom ends. The outer wall of the inner sleeve 121 is provided with first welding blocks 13 at intervals, the inner wall of the outer sleeve 122 is provided with second welding blocks 14 at intervals, and the first welding blocks 13 and the second welding blocks 14 are arranged at intervals. The top of protective tube 2 is integrative to be provided with the slot 12 that is used for connecting two upper and lower protective tubes 2, and slot 12 is enclosed by tubulose endotheca 121 and the overcoat 122 that the bottom sealed and closes and forms, and the outer wall interval of endotheca 121 is provided with first welding piece 13, and the inner wall interval of overcoat 122 is provided with second welding piece 14, and first welding piece 13 sets up with second welding piece 14 mutually. The bottom end of the upper protective tube 2 is fittingly inserted into the insertion slot 12 of the adjacent lower protective tube 2.
A construction method for processing operation by using the building foundation reinforcement structure comprises the following operation steps:
(1) as shown in fig. 1, a reinforcement pit 23 is excavated in the ground 22 such that the reinforcement pit 23 extends to a position directly below the building foundation 20.
(2) Welding a first section of steel pipe on the expansion part 3 with the pile head 4 welded at the bottom end, concentrically sleeving a first section of protective pipe on the periphery of the first section of steel pipe, and welding the bottom end of the first section of protective pipe and the expansion part 3 into a whole.
(3) The pile head 4 is inserted into the soil body below the foundation 21 in the reinforcing pit 23, the base plates are placed at the top ends of the first section of steel pipe and the first section of protective pipe, the jack is arranged between the base plates and the building foundation 20, the building foundation 20 is pushed by the jack to apply jacking counterforce, and therefore the pile head 4, the expansion piece 3, the first section of steel pipe and the first section of protective pipe are pressed into the soil body in sequence.
(4) Take off jack and backing plate, weld second section steel pipe in the upper end of first section steel pipe, concrete operation is: heating and melting a part of a first welding block 13 and a second welding block 14 in a slot 12 at the top end of a first section of steel pipe, inserting the lower end of a second section of steel pipe into the slot 12 at the top end of the first section of steel pipe, and supporting and clamping the second section of steel pipe at the top end of the first section of steel pipe; and continuously heating and melting the first welding block 13 and the second welding block 14 until the gaps between the inner sleeve 121 and the outer sleeve 122 and the second section of steel pipe are filled and blocked, so that the first section of steel pipe and the second section of steel pipe are welded into a whole. The operation of welding the second section of protective pipe to the upper end of the first section of protective pipe is the same as the welding operation between the steel pipes 11.
(5) And (5) repeating the operation of the step (4) to complete the welding of the steel pipes 11 and the protective pipes 2, and enabling the top ends of the static pressure piles and the protective pipes 2 to be abutted against the bottom end of the building foundation 20.
(6) To the top lateral wall trompil of static pressure pile, in order to avoid the trompil to cause the influence to static pressure pile structural stability, the hole has been opened in advance to the steel pipe of the top, pours grout in to static pressure pile through the trompil. And pouring cement slurry into the protective pipe 2 through the grouting holes 8, so that a cement protective layer 6 is formed between the static pressure pile and the protective pipe 2, and a cement reinforcing layer 5 is formed between the protective pipe 2 and the surrounding soil layer 10. A jack is fixed in the reinforcing pit 23 to support the bottom of the building foundation 20, and the space between the static pressure pile and the protective pipe 2 and the building foundation 20 is filled by the supporting plate 7.
(7) And pouring concrete into the reinforced pit 23 to obtain a concrete bearing platform 25, fixedly connecting the bottom of the reinforced pit 23 with the building foundation 20, filling the reinforced pit 23 to the ground 22, and completing the reinforcing construction operation.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (6)

1. The utility model provides a reinforced structure of building foundation, includes hydrostatic pile, pile head (4) and cement back up coat (5), the upper end of hydrostatic pile and the bottom mounting of building foundation (20) set up, the lower extreme and pile head (4) fixed connection of hydrostatic pile, in pile head (4) bottom stretched into the soil body of ground (21) below, cement back up coat (5) set up between hydrostatic pile and surrounding soil layer (10), its characterized in that: an expansion piece (3) used for expanding the inner diameter of a drilled hole of the pile head (4) in a soil body is fixedly arranged between the static pressure pile and the pile head (4), the expansion piece (3) is of a structure with a thick middle part and a thin upper part and a thin lower part, the bottom end of the expansion piece (3) is integrally and smoothly connected with the pile head (4), the top end of the expansion piece (3) is fixedly connected with the bottom end of the static pressure pile, and the maximum cross section of the expansion piece (3) is larger than that of the static pressure pile; a protective pipe (2) is vertically sleeved on the outer side of the static pressure pile, and the outer diameter of the protective pipe (2) is smaller than the maximum cross section of the expansion piece (3); the inner diameter of the protective pipe (2) is larger than the cross section of the static pressure pile, so that cement slurry is poured into a cavity between the protective pipe (2) and the static pressure pile to form a cement protective layer (6);
the static pressure pile is formed by sequentially welding a plurality of steel pipes (11) and then pouring concrete reinforcing slurry into the steel pipes (11); the top end of each steel pipe (11) forming the static pressure pile is integrally provided with a connecting component for connecting an upper steel pipe (11) and a lower steel pipe (11); the connecting assembly comprises a tubular inner sleeve (121) and a tubular outer sleeve (122) with sealed bottom ends, and a slot (12) spliced with the steel pipe (11) is formed between the inner sleeve (121) and the outer sleeve (122); the outer wall interval of endotheca (121) is provided with first welding piece (13), the inner wall interval of overcoat (122) is provided with second welding piece (14), first welding piece (13) and second welding piece (14) alternate the setting.
2. The reinforcing structure of a building foundation according to claim 1, wherein: the protective pipe is characterized in that grouting holes (8) are uniformly formed in the protective pipe (2), the grouting holes (8) are used for injecting cement slurry injected into the protective pipe (2) into a space between the protective pipe (2) and a surrounding soil layer (10) to form the cement reinforcing layer (5), and the cement slurry injected into the protective pipe (2) is filled in the cavity to form the cement protective layer (6).
3. The reinforcing structure of a building foundation according to claim 1, wherein: constitute the equal vertical cover in outside of every steel pipe (11) of hydrostatic pile is equipped with protective tube (2), the top of protective tube (2) an organic whole is provided with coupling assembling, in slot (12) on the coupling assembling of top protective tube (2) matches the bottom of inserting adjacent below protective tube (2), with expand the bottom and the expansion of the adjacent protective tube (2) of appearance piece (3) and hold piece (3) fixed connection.
4. A method for constructing a reinforcing structure of a foundation of a building according to any one of claims 1 to 3, comprising the following operating steps:
(1) excavating a reinforcement pit (23) to enable the reinforcement pit (23) to extend to the position right below a building foundation (20);
(2) welding a first section of steel pipe on an expansion part (3) with a pile head (4) at the bottom end, sleeving a first section of protective pipe on the periphery of the first section of steel pipe, and welding the bottom end of the first section of protective pipe and the expansion part (3) into a whole;
(3) inserting a pile head (4) into a soil body below a foundation (21) in a reinforcing pit (23), placing a base plate at the top ends of a first section of steel pipe and a first section of protective pipe, arranging a jack between the base plate and a building foundation (20), and pressing the pile head (4), a volume expanding piece (3), the first section of steel pipe and the first section of protective pipe into the soil body;
(4) the jack and the backing plate are taken down, a second section of steel pipe is welded at the upper end of the first section of steel pipe, a second section of protective pipe is arranged at the upper end of the first section of protective pipe, the backing plate is placed at the top ends of the second section of steel pipe and the second section of protective pipe, the jack is arranged between the backing plate and a building foundation (20), and the second section of steel pipe and the second section of protective pipe are pressed into the soil body;
(5) repeating the operation of the step (4) to complete the welding of the plurality of steel pipes (11) and the plurality of protective pipes (2), wherein the top ends of the static pressure piles and the protective pipes (2) are abutted against the bottom end of the building foundation (20);
(6) pouring cement paste into the static pressure pile; pouring cement slurry into the protective pipe (2) through the grouting hole (8), so that a cement protective layer (6) is formed between the static pressure pile and the protective pipe (2), and a cement reinforcing layer (5) is formed between the protective pipe (2) and a surrounding soil layer (10);
(7) pouring a concrete bearing platform (25) in the reinforcing pit (23), fixedly connecting the bottom of the reinforcing pit (23) with a building foundation (20), and filling the reinforcing pit (23) to the ground (22);
in the step (4), the specific operation of welding the second section of steel pipe on the upper end of the first section of steel pipe is as follows: after a first welding block (13) and a second welding block (14) in the first section of steel pipe top end connecting assembly are heated and melted, the lower end of a second section of steel pipe is inserted into a slot (12) in the top end of the first section of steel pipe, and the first section of steel pipe is connected with the second section of steel pipe in a welding mode.
5. The construction method of a reinforcing structure of a building foundation according to claim 4, wherein: in the step (4), the specific operation that the second section of protective pipe is arranged at the upper end of the first section of protective pipe is as follows: after a first welding block (13) and a second welding block (14) in the connecting component at the top end of the first section of protective pipe are heated and melted, the second section of protective pipe is sleeved in the periphery of the second section of steel pipe, the bottom end of the second section of protective pipe is inserted into a slot (12) at the top end of the first section of protective pipe in a matching mode, and the first section of protective pipe is connected with the second section of protective pipe in a welding mode.
6. The construction method of a reinforcing structure of a building foundation according to claim 4, wherein: in the step (6), after the cement reinforcing layer (5) and the cement protective layer are formed by pouring (6), a jack is arranged in the reinforcing pit (23) to jack the bottom of the building foundation (20), and the space between the static pressure pile and the protective pipe (2) and the building foundation (20) is filled by the support plate (7).
CN201811205860.3A 2018-10-17 2018-10-17 Reinforcing structure of building foundation and construction method thereof Active CN108999227B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811205860.3A CN108999227B (en) 2018-10-17 2018-10-17 Reinforcing structure of building foundation and construction method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811205860.3A CN108999227B (en) 2018-10-17 2018-10-17 Reinforcing structure of building foundation and construction method thereof

Publications (2)

Publication Number Publication Date
CN108999227A CN108999227A (en) 2018-12-14
CN108999227B true CN108999227B (en) 2020-06-26

Family

ID=64590064

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811205860.3A Active CN108999227B (en) 2018-10-17 2018-10-17 Reinforcing structure of building foundation and construction method thereof

Country Status (1)

Country Link
CN (1) CN108999227B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100585035B1 (en) * 2003-10-17 2006-06-08 주식회사 엠티마스타 Form and it's construction method for underwater pile reinforcement
CN103074890A (en) * 2013-01-29 2013-05-01 浙江华光市政建设有限公司 Plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile and construction method thereof
CN104179174A (en) * 2014-08-13 2014-12-03 山东科技大学 Porous grouted pipe special-shaped pile and pile-forming method
CN107190768A (en) * 2017-06-06 2017-09-22 西安科技大学 A kind of static pressure pile structure and its construction method for building strengthening of foundation
CN207176673U (en) * 2017-08-11 2018-04-03 苏州金螳螂园林绿化景观有限公司 Suitable for the anti-depression ground base enforcement structure of the small-sized ancient building in soft clay area

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100585035B1 (en) * 2003-10-17 2006-06-08 주식회사 엠티마스타 Form and it's construction method for underwater pile reinforcement
CN103074890A (en) * 2013-01-29 2013-05-01 浙江华光市政建设有限公司 Plastic sleeve and steel pipe combined cast-in-place concrete hollow pipe pile and construction method thereof
CN104179174A (en) * 2014-08-13 2014-12-03 山东科技大学 Porous grouted pipe special-shaped pile and pile-forming method
CN107190768A (en) * 2017-06-06 2017-09-22 西安科技大学 A kind of static pressure pile structure and its construction method for building strengthening of foundation
CN207176673U (en) * 2017-08-11 2018-04-03 苏州金螳螂园林绿化景观有限公司 Suitable for the anti-depression ground base enforcement structure of the small-sized ancient building in soft clay area

Also Published As

Publication number Publication date
CN108999227A (en) 2018-12-14

Similar Documents

Publication Publication Date Title
Tomlinson et al. Pile design and construction practice
AU724933B2 (en) Method and apparatus for forming piles in-situ
CN104818991B (en) A kind of construction method in Shallow-buried residual soil slope tunnel
Finno et al. Performance of a stiff support system in soft clay
RU2456409C2 (en) Method to test bearing capacity using circular sensor (versions)
CA2809638C (en) Extensible shells and related methods for constructing a support pier
CN105840207B (en) Construction method for comprehensive tunnel entering structure of large-span tunnel penetrating shallow-buried bias-pressure loose accumulation body
KR101022382B1 (en) Precast horizontality tubular roof and tunnel construction method using the same
Barksdale et al. Design and construction of stone columns, vol. I.
JP4375733B2 (en) Steel pipe placing method
RU2408765C2 (en) Pyramid or cone ramming tip and method of its use to erect rammed crushed stone supports
US7326004B2 (en) Apparatus for providing a rammed aggregate pier
KR100713787B1 (en) The underground structure assembly and the underground structure building method which it uses
KR100742117B1 (en) Support load measurement way of concrete pail and the installation established on base
Cheng et al. Recent massive incidents for subway construction in soft alluvial deposits of Taiwan: a review
JP2004027813A5 (en)
KR100964796B1 (en) Method for constructing the steel pipe-concrete composite pile structurized of burying and unifying into the bedrock, and a pile construction
US10513831B2 (en) Open-end extensible shells and related methods for constructing a support pier
CN205742213U (en) Foundation pit supporting construction
US9243379B2 (en) Method of providing a support column
KR101882373B1 (en) Method and apparatus for testing load-bearing capacity
JP2007126846A (en) Reinforcing cage, construction method for cast-in-place concrete pile, and cast-in-place concrete pile
CN104018518A (en) Prefabricated underground diaphragm wall and method for constructing outer basement wall and floor slabs
KR20110043017A (en) The earth retaining wall and waterproof construction technique for which cast in place concrete pile and grouting column was used
CN104895055A (en) Building grouting pile foundation construction method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant