CN112482367A - Foundation pit support pile for replacing cast-in-place pile rock-socketed with steel pipe pile - Google Patents
Foundation pit support pile for replacing cast-in-place pile rock-socketed with steel pipe pile Download PDFInfo
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- CN112482367A CN112482367A CN202011343414.6A CN202011343414A CN112482367A CN 112482367 A CN112482367 A CN 112482367A CN 202011343414 A CN202011343414 A CN 202011343414A CN 112482367 A CN112482367 A CN 112482367A
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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
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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
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a foundation pit supporting pile for replacing cast-in-place pile socketed rock with a steel pipe pile, and belongs to the field of foundation engineering. The foundation pit supporting pile comprises an upper supporting cast-in-place pile and a lower rock-socketed steel pipe pile, wherein the rock-socketed steel pipe pile is formed by embedding a plurality of steel pipes into bedrock and pouring cement slurry, and the upper part of each steel pipe extends into the supporting cast-in-place pile to be in lap joint with a pile body reinforcing bar. During construction, firstly, the hole is formed to the complete bedrock surface, then the hole forming is stopped, the hole is formed in the hole by drilling with a drilling machine, then, a steel pipe is placed into the hole, cement paste is injected into the hole, the steel pipe and the bedrock are solidified into a whole, and the replacement of the support cast-in-place pile rock embedding is realized. The method has the advantages of larger aperture of the steel pipe pile, less number of holes, easy centering during pipe laying, low cost, high construction speed and simple process. In the karst area, the karst cave can be vertically crossed, so that the material is saved, and the stability of the rock-socketed section of the supporting pile is ensured. Meanwhile, in a bedrock fracture development area, the strength of the bedrock is greatly improved by grouting cement, and the problem of the strength of the bedrock due to fracture development is solved.
Description
Technical Field
The invention relates to a foundation pit supporting pile for replacing cast-in-place pile socketed rock with a steel pipe pile, and belongs to the field of foundation engineering.
Background
At present, because of large lateral soil pressure and complex geological conditions, a deep and large foundation pit is excavated by adopting a pile anchor or an inner support for supporting, a support pile generally adopts a bored (punching and excavating) hole cast-in-place pile, the depth is determined to be a certain depth below the bottom of the foundation pit according to calculation, and a pile body is reinforced and is cast with concrete. However, when the supporting pile is designed to be subjected to rock-socketed construction, the use safety of the surrounding environment of the foundation pit is affected due to the fact that bedrock is hard, the construction speed is slow, vibration or blasting construction is affected, life safety problems exist when the supporting pile is a hole digging pile, the phenomenon of concrete over-irrigation still exists in a karst development area, the traditional rock-socketed construction has the defects of long construction period, high cost, large potential safety hazard and the like, and the rock-socketed part of the supporting pile needs to be replaced by other processes.
Generally, a small hole is drilled in a support cast-in-place pile hole, reinforcing steel bars are placed in the hole to be cast-in-place with mortar to form a rock-socketed mortar anchor rod for replacement, and the number of the placed reinforcing steel bars is calculated according to the equal-section reinforcing steel bars. However, because the section of the steel bar is smaller, the number of the required steel bars is more according to the equal section reinforcement calculation, the number of corresponding small holes is more, the hole diameter of the small hole is limited in the limited range of the hole diameter of the support cast-in-place pile, and the drilling cost is high; meanwhile, when cement mortar is adopted for pouring, the filling effect on bed rock cracks in the bed rock with the cracks developing is poor, technical hidden troubles exist in the rock-socketed section of the foundation pit supporting pile due to insufficient strength of the rock-socketed section due to the cracks developing, the supporting pile is deformed too much, and the safety of foundation pit excavation and peripheral structures is influenced.
Therefore, the rock-socketed part of the support pile is replaced, the number of small holes is controlled, the drilling cost is reduced, the centering problem during construction is solved, and the problem of strength of bedrock due to crack development is solved.
Disclosure of Invention
The invention aims to provide a foundation pit support pile for replacing cast-in-place pile socketed rock with a steel pipe pile, so as to solve the defects of long construction period, high cost, large construction potential safety hazard and the like of a cast-in-place pile socketed rock part, control the number of small holes, reduce drilling cost, overcome the centering problem during construction, solve the problem of strength of bedrock due to crack development, and achieve the purposes of shortening the construction period, reducing cost and eliminating potential safety hazard.
The invention discloses a foundation pit supporting pile for replacing cast-in-place pile socketed by a steel pipe pile, which comprises an upper supporting cast-in-place pile and a lower socketed steel pipe pile, wherein the supporting cast-in-place pile consists of pile body concrete and pile body reinforcing bars, and the diameter of a pile hole is 0.8-2.0 m; the socketed steel pipe pile is formed by embedding a plurality of steel pipes into bedrock and pouring cement slurry, and the upper parts of the steel pipes extend into the support pouring pile to be lapped with the reinforcing bars of the pile body.
The foundation pit support pile for replacing cast-in-place pile rock-socketed by the steel pipe pile further comprises a steel pipe which is arranged in a karst area after high-pressure rotary spraying treatment is carried out on the karst cave when the karst cave is met.
The foundation pit support pile for replacing cast-in-place pile socketed rock with the steel pipe pile further comprises a step of placing the steel pipe into the small hole to pour cement mortar under the condition that bedrock is complete.
The construction of the foundation pit support pile for replacing cast-in-place pile socketed with the steel pipe pile comprises the following steps:
1. forming a hole downwards along the center of the support pile by adopting manual or mechanical methods, wherein the hole diameter is 0.8-2.0 m;
2. stopping pore-forming when the pore-forming reaches the complete bedrock surface;
3. drilling a small hole in the hole of the support cast-in-place pile by using a drilling machine, wherein the diameter of the small hole is 90-200 mm, placing a steel pipe into the small hole after drilling is finished, injecting cement paste into the small hole, and connecting the support cast-in-place pile and the bedrock into a whole through the rock-socketed steel pipe pile;
the invention designs a foundation pit supporting pile for replacing cast-in-place pile socketed rock by using a steel pipe pile, which has the following advantages:
1. shortening the construction period and reducing the cost. The steel pipe pile is used for replacing the cast-in-place pile for constructing the rock-socketed foundation pit supporting pile, when the cast-in-place pile is formed into a hole to a hard rock surface, the rock-socketed construction efficiency is low, the construction speed is low, the cost is high, the phenomenon of concrete over-grouting still exists in a karst area, a drilling machine is used for drilling, pipe descending and pouring the steel pipe pile at the hole opening, the hole diameter of a small hole is large, the number of holes is small, centering is easy to occur during pipe descending, the cost is low, and the construction. The bedrock and the support cast-in-place pile are connected into a whole through the socketed steel pipe pile, the strength of the rock is fully utilized, the concrete cost of a socketed part is saved, and the process is simple, so that the cost is reduced, and the construction period is shortened. In karst areas, karst caves can be spanned vertically, concrete materials are saved, and stability of the supporting pile rock-socketed section is guaranteed.
2. The safety performance is good. Because the construction vibration of the rock-socketed part of the support cast-in-place pile is large, and the influence of blasting still exists when the manual hole digging process is adopted for construction, accidents such as the damage of adjacent structures, the collapse of hole walls and even casualties are caused. The steel pipe pile is adopted to replace the cast-in-place pile rock-socketed foundation pit supporting pile for construction, the steel pipe is utilized to replace pile body reinforcing bars, the tensile force is borne, the shearing force of the interface between the cast-in-place pile and the bedrock is supported, the process is simple, the blasting is not needed, the vibration does not exist, the construction cover plate is arranged at the orifice, the construction safety is high, and the surrounding environment of the foundation pit is not influenced. Meanwhile, in a bedrock fracture development area, the strength of the bedrock is greatly improved by filling cement slurry and filling the fracture, and the problem of the strength of the bedrock due to fracture development is solved.
Description of the drawings
Fig. 1 is a schematic structural diagram of a foundation pit support pile for replacing cast-in-place pile socketed by a steel pipe pile.
Fig. 2 is a schematic structural diagram of an application example of the present invention.
Fig. 3 is a sectional view taken along line a-a of fig. 1.
Fig. 4 is a view showing the structure B-B of fig. 2.
In the drawings 1-4, 1 is the ground, 2 is the excavation side of a foundation pit, 3 is the soil facing side of the foundation pit, 4 is a supporting cast-in-place pile, 5 is the bottom surface of the foundation pit, 6 is the top surface of a bed rock, 7 is an embedded rock steel pipe pile, 8 is a supporting cast-in-place pile reinforcing bar, 9 is a steel support, 10 is a pit edge structure, GL is a crown beam, H is the excavation depth, D is the depth embedded into the bottom of the foundation pit, L1 is the length of the embedded rock steel pipe pile extending into the supporting pile, and L2 is the depth of the embedded rock steel pipe pile embedded into the bed rock.
Fifth, detailed description of the invention
The invention relates to a foundation pit supporting pile for replacing cast-in-place pile socketed by a steel pipe pile, which has a structural schematic diagram shown in figure 1 and comprises a supporting cast-in-place pile 4 and a socketed steel pipe pile 7, wherein the supporting cast-in-place pile consists of pile body concrete and pile body reinforcing bars 8, and the diameter of the pile body is 0.8-2.0 m; the socketed steel pipe pile is composed of a plurality of steel pipes 7 embedded in bedrock L2 and poured cement paste, and the upper parts of the steel pipes extend into the poured pile L1 and are in lap joint with a steel reinforcement cage.
The foundation pit supporting pile for replacing cast-in-place pile rock-socketed by the steel pipe pile further comprises a steel pipe which is arranged in a karst area after high-pressure rotary spraying treatment is carried out on a karst cave at the bottom of the pile when the karst cave is met.
The foundation pit support pile for replacing the cast-in-place pile socketed by the steel pipe pile further comprises a steel pipe 7 which is arranged in the small hole under the condition that bedrock is complete and is used for pouring cement mortar.
The construction of the foundation pit support pile for replacing cast-in-place pile socketed with the steel pipe pile comprises the following steps:
1. forming a hole downwards along the center of the support pile by adopting manual or mechanical methods, wherein the hole diameter is 0.8-2.0 m;
2. stopping pore-forming when the pore-forming reaches the complete bedrock surface;
3. drilling a small hole in the hole of the support cast-in-place pile, wherein the diameter of the small hole is 90-200 mm, placing a steel pipe into the small hole after drilling is finished, injecting cement paste into the small hole, and connecting the support cast-in-place pile and the bedrock into a whole through the rock-socketed steel pipe pile;
4. and (5) performing the pouring construction of the support pile.
The concrete construction process of the foundation pit support pile for replacing cast-in-place pile socketed rock with the steel pipe pile is as follows:
firstly, forming a hole downwards from the ground 1 along the center of the arranged support piles, wherein the hole diameter is 0.8-2.0 m; and stopping pore-forming when the pore-forming reaches the complete bed rock surface 6, performing pile hole construction on the steel pipe pile by using a drilling machine at the position of the steel pipe pile, drilling a hole D below the bottom surface of the foundation pit, then placing a steel pipe into the hole and pouring cement paste to form a vertical steel pipe pile 7, extending the steel pipe pile into a support pile L1, embedding the support pile L2 to enable the steel pipe to be connected with the support cast-in-place pile reinforcing bars, and finally pouring concrete of the support cast-in-place pile to form the complete support pile.
The invention provides a foundation pit support pile using a steel pipe pile to replace cast-in-place pile socketed rock, which is characterized in that bedrock is used to replace concrete of a rock socketed part of a support cast-in-place pile 4, a steel pipe 7 is arranged to replace pile body reinforcing bars, the tensile force and the shearing force of a boundary between the support cast-in-place pile and the bedrock are borne, and meanwhile, the bed rock crack is consolidated by grouting cement slurry, so that the strength of the bedrock is improved. The support pile can also be used together with anchor rods (cables) or a support system to form a support system.
The foundation pit support pile is a bending member and bears bending moment and shearing force generated by lateral soil pressure. The compression area is mainly borne by concrete, and the tension area is borne by steel bars. The invention discloses a foundation pit support pile for replacing cast-in-place pile socketed rock by a steel pipe pile, which mainly comprises the following principles: (1) the bedrock is used for replacing the concrete of the rock-socketed part of the support pile to bear compressive stress, so that the concrete of the rock-socketed part is saved; (2) embedding the steel pipe pile into the bedrock and extending into the upper support cast-in-place pile, bearing tensile stress and resisting shearing force of the support cast-in-place pile and a bedrock interface; (3) the upper support filling pile is connected through the socketed steel pipe pile, so that the stress of the upper support filling pile is coordinated and uniform, and the upper support filling pile can be used together with an anchor rod (cable) or a support system; (4) and the bed rock cracks are consolidated by grouting cement paste, so that the strength of the bed rock is improved.
Two examples of applications of the invention are presented below:
example 1 since the foundation pit is shallow, the cantilever type support piles are adopted by calculation, and the depth of the foundation pit is 8 m.
The design is shown in figure 1. Arranging pile positions of the support piles according to a drawing, drilling downwards from the ground, wherein the hole diameter is 800mm, and the drilling is stopped when the drilling reaches a bedrock surface, and the burial depth of the bedrock surface is about 9 m. According to calculation, 16 reinforcing bars are uniformly distributed in the reinforcement cage
25, designing 4 steel-pipe piles, adopting 89 x 10 seamless geological steel pipes as materials, forming holes on the steel-pipe piles from the orifices to the hole bottoms, wherein the hole diameter is 90mm, the steel pipes are embedded into 3.0m below the bedrock surface and stretch into the support piles by 1.0m, and cement mortar is poured into the steel pipes. And after the construction of the steel pipe pile is finished, cleaning the foundation rock surface, then placing a steel reinforcement cage and pouring concrete, and performing crown beam construction after the construction of the support cast-in-place pile is finished.
Example 2
When the foundation pit is excavated deeply and the cantilever type support can not meet the technical and safety requirements, the foundation pit is supported by adopting a method of adding a support pile and anchoring or supporting. The example is an example of combined support with a steel pipe support, the depth of a foundation pit is 10.0m, the geological conditions are complex, and the requirement on the surrounding environment is high.
As shown in fig. 2, 3 and 4. The excavation depth of the foundation pit engineering is 10m, the foundation pit engineering is a wastewater zero-emission engineering water collecting tank of a certain smelting plant, the construction period is extremely short, the surrounding environment of the foundation pit is complex, the site is narrow, the bedrock is limestone, and cracks and karst caves develop. Because the foundation pit is close to the plant, the periphery of the foundation pit is not allowed to vibrate greatly, punching construction and blasting construction cannot be carried out, and the support pile is designed to be supported by a manual hole digging pile; because the two supports conflict with the underground structure and influence excavation, the design and the arrangement of one top support; meanwhile, for the construction period, the rock embedding part of the hole digging pile is replaced by a steel pipe pile. The actual design supporting structure is shown in figure 2.
The design fender pile adopts artifical hole digging technology, 1200 is covered on the stake footpath, the stake interval 1800mm, and 89 x 10 seamless geology steel pipe is adopted on the substitute material of the design embedded rock section, through the internal force calculation of structure, the real area 13254 of joining in marriage of main muscle of pile body, 27 promptly
25, using 89 x 10 seamless geological steel pipes as anchor pipes, directly embedding rocks and pouring cement paste. According to the calculation of the anchoring length and the length of the pile extending into the hole, the depth of the steel pipe embedded into the bedrock is determined to be 4.2m, the length of the pile extending into the hole is 1.8m, and the total length of the single steel pipe pile is 6.0 m. The diameter of the formed hole is preferably larger than or equal to 100mm, a steel pipe pile is additionally arranged in the center to adjust the stress condition, and 7 steel pipe piles are arranged in total as shown in figure 3.
When the bedrock is completely stable, the rock-entering depth of the central steel pipe pile is 1.5m, and the rock-entering depth of the peripheral steel pipe piles is 4.5 m. When the thickness h of the top plate is less than or equal to 2m in a karst cave, the final hole condition of the steel pipe pile is that the cumulative rock-socketed thickness of the hole is 4.5m or the hole depth reaches 9 m; when the thickness of the top plate is more than 2m, the final hole conditions of the steel pipe pile are that the hole depth is 7m or the accumulated rock-socketed thickness is 4.5m (the hole depth refers to the depth below the base).
During construction, pile positions of support piles are arranged according to a drawing, anti-seepage measures are taken, manual hole digging pile construction is carried out downwards from the ground, the hole diameter is 1200mm, digging is stopped until a bed rock surface is dug, and the burial depth of the bed rock surface is about 12.0 m. And (3) forming a hole of the steel pipe pile to the bottom of the hole by using a drilling machine at the hole opening, wherein the hole diameter is 100mm, the steel pipe is embedded below the surface of the bedrock according to the design requirement and extends into the support pile by 1.8m, and cement slurry is poured into the steel pipe. And after the construction of the steel pipe pile is finished, cleaning the surface of the foundation rock, then carrying out pile body reinforcement and pouring concrete, and carrying out crown beam construction after the construction of the support pouring pile is finished. And finally, carrying out construction of the inner support of the steel pipe during excavation.
Claims (4)
1. A foundation pit supporting pile for replacing cast-in-place pile socketed by a steel pipe pile comprises an upper supporting cast-in-place pile and a lower socketed steel pipe pile, wherein the supporting cast-in-place pile is composed of pile body concrete and pile body reinforcing bars, and the diameter of a pile body is 0.8-2.0 m; the socketed steel pipe pile is formed by embedding a plurality of steel pipes into bedrock and pouring cement paste, and the upper parts of the steel pipes extend into the pouring pile to be lapped with the pile body reinforcing bars.
2. The foundation pit support pile for replacing cast-in-place pile socketed rock with the steel pipe pile as claimed in claim 1, wherein the support pile construction method further comprises the steps of performing high-pressure jet grouting treatment on the karst cave and then placing the steel pipe into the karst cave when the karst cave is encountered in a karst area.
3. The foundation pit support pile for replacing socketed cast-in-place pile with steel pipe pile as claimed in claim 1, wherein the support pile further comprises placing steel pipe into the small hole for pouring cement mortar under the condition of complete bedrock.
4. A foundation pit support pile for replacing cast-in-place pile socketed rock with a steel pipe pile as claimed in claim 1, characterized in that the support pile construction comprises the following steps:
(1) forming a hole downwards along the center of the support pile by adopting manual or mechanical methods, wherein the hole diameter is 0.8-2.0 m;
(2) stopping pore-forming when the pore-forming reaches the complete bedrock surface;
(3) drilling a small hole in the hole of the support cast-in-place pile, wherein the diameter of the small hole is 90-200 mm, placing a steel pipe into the small hole after drilling is finished, injecting cement paste into the small hole, and connecting the support cast-in-place pile and the bedrock into a whole through the steel pipe pile;
(4) and (5) constructing a support cast-in-place pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011343414.6A CN112482367A (en) | 2020-11-26 | 2020-11-26 | Foundation pit support pile for replacing cast-in-place pile rock-socketed with steel pipe pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011343414.6A CN112482367A (en) | 2020-11-26 | 2020-11-26 | Foundation pit support pile for replacing cast-in-place pile rock-socketed with steel pipe pile |
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| CN112482367A true CN112482367A (en) | 2021-03-12 |
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| CN202011343414.6A Pending CN112482367A (en) | 2020-11-26 | 2020-11-26 | Foundation pit support pile for replacing cast-in-place pile rock-socketed with steel pipe pile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700000A (en) * | 2021-08-26 | 2021-11-26 | 中建八局第二建设有限公司 | Supporting construction of binary geology hitching leg stake |
| CN114482071A (en) * | 2022-02-28 | 2022-05-13 | 中国建筑第五工程局有限公司 | Device for improving rock-socketed depth of large-diameter cast-in-place pile |
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| CN101122131A (en) * | 2007-08-14 | 2008-02-13 | 蓝冰 | Foundation pit supporting pile using pipe casting pile embedding in rock |
| CN203625893U (en) * | 2013-12-23 | 2014-06-04 | 青岛业高建设工程有限公司 | Rock-embedded cast-in-place pile |
| CN104196014A (en) * | 2014-09-11 | 2014-12-10 | 中南大学 | Combined rock-embedded anchor cable slide-resistant pile where round steel is implanted and construction method thereof |
| KR20160088059A (en) * | 2015-01-15 | 2016-07-25 | 주식회사 씨엠파트너스건축사사무소 | CFT pile Construction Method and the Shoring Method using the same file |
| CN108505531A (en) * | 2017-02-28 | 2018-09-07 | 中国电力工程顾问集团华北电力设计院有限公司 | The embedding rock of offshore wind farm mixes pile foundation |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101122131A (en) * | 2007-08-14 | 2008-02-13 | 蓝冰 | Foundation pit supporting pile using pipe casting pile embedding in rock |
| CN203625893U (en) * | 2013-12-23 | 2014-06-04 | 青岛业高建设工程有限公司 | Rock-embedded cast-in-place pile |
| CN104196014A (en) * | 2014-09-11 | 2014-12-10 | 中南大学 | Combined rock-embedded anchor cable slide-resistant pile where round steel is implanted and construction method thereof |
| KR20160088059A (en) * | 2015-01-15 | 2016-07-25 | 주식회사 씨엠파트너스건축사사무소 | CFT pile Construction Method and the Shoring Method using the same file |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700000A (en) * | 2021-08-26 | 2021-11-26 | 中建八局第二建设有限公司 | Supporting construction of binary geology hitching leg stake |
| CN114482071A (en) * | 2022-02-28 | 2022-05-13 | 中国建筑第五工程局有限公司 | Device for improving rock-socketed depth of large-diameter cast-in-place pile |
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Application publication date: 20210312 |