CN113006057B - Cement soil combined pile with controllable strength and design method - Google Patents

Cement soil combined pile with controllable strength and design method Download PDF

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Publication number
CN113006057B
CN113006057B CN202110255545.7A CN202110255545A CN113006057B CN 113006057 B CN113006057 B CN 113006057B CN 202110255545 A CN202110255545 A CN 202110255545A CN 113006057 B CN113006057 B CN 113006057B
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pile
grouting
bag
cement
soil
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CN113006057A (en
Inventor
宋义仲
程海涛
崔洪涛
孙永梅
万立华
朱锋
米春荣
刘彬
李建明
常国瑞
魏进
孙贝
白冬冬
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Shandong Jianke Special Construction Engineering Technology Center Co ltd
Shandong Jianyan Technology Development Co ltd
Shandong Provincial Academy of Building Research
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Shandong Jianke Special Construction Engineering Technology Center Co ltd
Shandong Jianyan Technology Development Co ltd
Shandong Provincial Academy of Building Research
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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
    • E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
    • 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
    • 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
    • E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/003—Injection of material
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0085—Geotextiles

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The disclosure relates to the technical field of foundation of civil engineering, in particular to a cement-soil combined pile with controllable strength and a design method. The invention discloses a cement soil combined pile with controllable strength, which comprises peripheral cement soil piles; a core pile precast pile is arranged in the peripheral cement soil pile; the bottom of the core pile precast pile is connected with the connecting plate; the grouting bag comprises a grouting pipe which is in threaded connection with the connecting plate; the strength-controllable cement-soil combined pile designed by the invention adopts the grouting bag to replace cement-soil of the coreless pile section, and compared with the traditional cement-soil core-inserted combined pile, the strength-controllable cement-soil combined pile has the advantages that the pile body quality of the bottom end of the core pile is controllable, the strength is improved, the length of a precast pile of the core pile is shortened, the manufacturing cost is low, and the cost is saved.

Description

Cement soil combined pile with controllable strength and design method
Technical Field
The disclosure relates to the technical field of foundation of civil engineering, in particular to a cement-soil combined pile with controllable strength and a design method.
Background
The core filling pipe pile cement soil composite foundation pile disclosed in China patent application number ZL201010189668.7 is formed by combining a cement soil pile formed by a high-spraying stirring method and a concentric embedded core pile, and combines the advantages of the cement soil pile and the core pile, so that the core pile is utilized to bear load, the large-diameter cement soil pile is utilized to provide side friction resistance, and the single pile bearing capacity is obviously larger than that of the cement soil pile and the filling pile with the same specification and size. However, the cement soil pile at the bottom end of the core pile is still low in strength and uncontrollable in quality, and in pile design, in order to fully exert the bearing capacity of a single pile, the length of the core pile is generally 0.8-0.9 times of that of the cement soil pile, even equal in length, which results in relatively increased cost.
The Chinese patent with application number ZL201010189668.7 discloses a core pile guiding device suitable for a cement soil core inserting combined pile, and the diameter of a circumcircle of a guide is equal to the diameter of the cement soil pile through the combination of the core pile, a connecting piece and the guide; in the core pile implantation process, the undisturbed soil around the cement soil pile is used for limiting the core pile through the guide device to realize the guide of the implanted core pile. But the problem of the longer design of the core stake has not been solved.
Disclosure of Invention
Aiming at the defects of the prior technical scheme, the invention aims to provide the cement-soil combined pile with controllable strength and a design method, and provides the cement-soil combined pile with controllable strength, high strength, controllable quality, economy and good social benefit.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
the invention discloses a cement soil combined pile with controllable strength, which comprises peripheral cement soil piles; a core pile precast pile is arranged in the peripheral cement soil pile; the bottom of the core pile precast pile is connected with the connecting plate; the grouting bag comprises a grouting pipe which is in threaded connection with the connecting plate;
further, the section size of the connecting plate is the same as that of the precast pile of the core pile;
further, the grouting pipe is a hollow steel flower pipe;
further, a threaded hole is formed in the center of the connecting plate, and external threads are formed in the outer circumference of one end part of the grouting pipe; grouting openings are uniformly formed in the outer circumference of the grouting pipe;
further, the grouting bag further comprises a geotechnical bag, the grouting pipe is connected with the geotechnical bag, and one end of the grouting pipe extends out of the geotechnical bag; the grouting pipe is positioned at the center of the geotechnical bag, and the axis of the grouting pipe is perpendicular to the bottom of the geotechnical bag;
further, the height value of the grouting bag after grouting is equal to the height value of the grouting pipe;
further, the height value of the geotechnical bag of the grouting bag after grouting does not exceed the height value of the precast pile of the core pile and is not shorter than 3 times of the diameter or side length of the precast pile of the core pile;
further, the diameter of the bag body of the grouting bag after grouting of the geotechnical bag is not smaller than the maximum diameter of the soil cement composite pile;
the disclosure also relates to a design method of the cement soil composite pile with controllable strength, which comprises the following specific steps:
the bottom of the core pile precast pile is connected with the top of the connecting plate, and the core pile precast pile and the axis of the connecting plate are coaxially arranged;
the core pile precast pile is arranged in the peripheral cement soil pile;
the grouting pipe is placed in the geotechnical bag, the grouting pipe is in sealing connection with the position of the bag opening of the geotechnical bag, and one end of the grouting pipe extends out of the geotechnical bag; an external thread is arranged at one end of the grouting pipe extending out of the geotechnical bag, a threaded hole is arranged on the connecting plate, and the grouting pipe is connected to the connecting plate through threads, so that the grouting bag is connected with the connecting plate;
the grouting bag is connected with the bottom surface of the connecting plate, and then is sunk to the designed elevation together with the precast pile of the core pile through the grouting pipe;
filling materials are injected into the grouting bag through the grouting pipe, and then the geotechnical bag is gradually expanded to the designed size; the strength of the filling material in the grouting bag after hardening is used as the integral strength of the non-core pile section.
Furthermore, the strength of the slurry material injected into the grouting bag is not lower than 2MPa, and the material can be cement slurry, cement soil, construction waste and cement slurry mixed slurry.
The beneficial effects of the above technical scheme are:
1. the strength-controllable cement-soil combined pile designed by the invention adopts the grouting bag to replace cement-soil of the coreless pile section, and compared with the traditional cement-soil core-inserted combined pile, the strength-controllable cement-soil combined pile has the advantages that the pile body quality of the bottom end of the core pile is controllable, the strength is improved, the length of a precast pile of the core pile is shortened, the manufacturing cost is low, and the cost is saved.
2. The grouting material in the cement-soil combined pile with the controllable strength can adopt construction waste particles, and compared with the existing cement-soil combined pile, the cement-soil combined pile with the controllable strength can recycle wastes, is environment-friendly and has social benefits.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the structure of the cement-soil composite pile with controllable strength before grouting.
Fig. 2 is a schematic diagram of the structure of the grouting pile of the cement soil combination pile with controllable strength.
Fig. 3 is a bottom view of fig. 2.
Fig. 4 is a schematic view of the structure after filling the grouting bag with material.
FIG. 5 is a plot of the shortened pile length ratio for different conditions.
FIG. 6 is a graph of cement savings under different conditions.
FIG. 7 is a graph of cost savings under different operating conditions.
FIG. 8 is a cost-effective proportional graph for different operating conditions.
In the figure: 1. the pile comprises a core pile precast pile, a peripheral cement soil pile, a connecting plate, a grouting pipe, a geotechnical bag and a grouting bag.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as described in the background section, the cement-soil piles at the bottom ends of the prior art are still low in strength and uncontrollable in quality, and in pile design, in order to fully exert the bearing capacity of a single pile, the pile length of the core pile is generally 0.8-0.9 times that of the cement-soil piles, even equal in length, which results in relatively increased cost.
Example 1
Referring to fig. 1-4, the invention discloses a cement soil composite pile with controllable strength, which comprises peripheral cement soil piles; a core pile precast pile is arranged in the peripheral cement soil pile; the bottom of the core pile precast pile is connected with the connecting plate; the grouting bag comprises a grouting pipe, and the grouting pipe is in threaded connection with the connecting plate.
As shown in fig. 1, the precast pile 1 of the core pile is placed in the peripheral cement soil pile to be in contact with the peripheral cement soil pile; the bottom of the core pile precast pile is fixedly connected with the connecting plate; the height value of the connecting plate is far smaller than that of the precast pile of the core pile, the connecting plate and the axis of the precast pile of the core pile are coaxially arranged, and the connecting plate is positioned right below the precast pile of the core pile; the section size of the connecting plate is the same as that of the precast pile of the core pile.
As shown in fig. 1 and 2, the grouting bag comprises a grouting pipe 4 and a geotechnical bag 5, wherein the grouting pipe is connected with the geotechnical bag, one end of the grouting pipe is positioned at the central position in the geotechnical bag, and the grouting pipe is perpendicular to the bottom of the geotechnical bag; the grouting pipe is a hollow steel flower pipe; the grouting pipe and the main body of the geotechnical bag are in cylindrical structures; one end of the grouting pipe is connected with the mouth of the geotechnical bag, the joint of the grouting pipe and the mouth of the geotechnical bag is sealed by adopting a sealing piece, and the grouting pipe can be bonded by adopting a sealing ring or a sealing adhesive tape, and can be specifically selected according to actual needs.
The periphery of one end of the grouting pipe extending out of the geotechnical bag is provided with threads, the center position of the connecting plate is provided with a threaded through hole, one end of the grouting pipe is connected with the center position of the connecting plate through threads, and one end of the grouting pipe extends out of the connecting plate;
the grouting pipe is provided with a grouting opening on the outer circumferential surface positioned in the geotechnical bag, and the filling material permeates into the geotechnical bag through the grouting opening on the grouting pipe.
The height value of the grouting bag after grouting is equal to the height value of the grouting pipe; the height value of the grouting bag after grouting does not exceed the height value of the precast pile of the core pile and is not shorter than 3 times of the diameter or side length of the precast pile of the core pile; the diameter of the bag body after grouting of the grouting bag is not smaller than the maximum diameter of the cement soil combined pile.
The most critical concept of the invention is as follows: according to the scheme, the core pile precast piles connected with the grouting bag are sunk to the designed elevation together, filling materials are further injected into the grouting bag to form a reinforcing body, the cement soil piles of the non-core pile sections are replaced, the overall strength of the non-core pile sections is further controlled and improved, the length of the core pile is shortened, and the cost is saved. When the filling material is selected from construction waste, the waste can be recycled, and the method is environment-friendly and has social benefits.
The design method of the cement soil combined pile with the controllable strength comprises the following steps:
the bottom of the core pile precast pile is connected with the top of the connecting plate, and the core pile precast pile and the axis of the connecting plate are coaxially arranged;
the core pile precast pile is arranged in the peripheral cement soil pile;
the grouting pipe is placed in the geotechnical bag, the grouting pipe is in sealing connection with the position of the bag opening of the geotechnical bag, and one end of the grouting pipe extends out of the geotechnical bag; an external thread is arranged at one end of the grouting pipe extending out of the geotechnical bag, a threaded hole is arranged on the connecting plate, and the grouting pipe is connected to the connecting plate through threads, so that the grouting bag is connected with the connecting plate;
the grouting bag is connected with the bottom surface of the connecting plate, and then is sunk to the designed elevation together with the precast pile of the core pile through the grouting pipe;
as shown in fig. 2-4, after filling material is injected into the grouting bag through the grouting pipe, the geotextile bag is gradually expanded to the designed size; the strength of the filling material in the grouting bag after hardening is used as the integral strength of the non-core pile section.
The strength of the slurry material injected into the grouting bag is not lower than 2MPa, and the material can be cement slurry, cement soil, construction waste and cement slurry mixed slurry.
Example 2
And calculating the lengths of the core pile sections when different grouting body strengths are adopted according to the existing standard.
By comparing and analyzing a certain engineering example, the economic benefit of the cement-soil combined pile with controllable strength is compared with that of the existing cement-soil mortice combined pile. Fig. 5, 6 and 7 are respectively a shortened pile length curve diagram under different working conditions, a cement saving amount curve diagram under different working conditions and a cost saving curve diagram under different working conditions.
In the engineering of certain pile foundation in Shandong Texas, cement composite pipe piles are designed, the diameter of peripheral cement piles is 850mm, the pile length is 25m, and the cement mixing amount is 500kg/m 3 The strength of the cement soil is 2MPa; the core pile is a high-strength prestressed concrete pipe pile, the model is UHC500AB100, and the pile length is 23.5m; and the standard value of the vertical ultimate bearing capacity of a single engineering pile is 6200kN.
Adopting the cement soil composite pile with controllable strength for comparative analysis, wherein the diameter of the peripheral cement soil pile is 850mm, the pile length is 25m, the grouting strength of the non-core pile section is 2MPa, 3MPa, 4MPa, 5MPa, 6MPa and 7MPa respectively, and the cement doping amounts are respectively170kg/m 3 、215kg/m 3 、260kg/m 3 、305kg/m 3 、350kg/m 3 、400kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The core pile section adopts ultra-high strength concrete pipe piles, the model is UHC500AB100, the pile lengths are 23.5m, 21.6m, 19.64m, 17.74m, 15.84m and 13.14m respectively, and the bearing capacity of each pile is 6200kN, and the economic comparison is shown in the following table.
Figure BDA0002968193360000071
Figure BDA0002968193360000081
The advantages of the invention in the actual working condition can be more intuitively seen through the graphs of fig. 5-7, when the strength of the grouting body is increased, the length of the used core pile can be gradually reduced, the length of the core pile is shortened, the cement amount is saved, and compared with the prior art, the strength-controllable cement soil combined pile designed by the invention has low manufacturing cost, cost saving and great application value.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (7)

1. The cement-soil combined pile with the controllable strength is characterized by comprising peripheral cement-soil piles; a core pile precast pile is arranged in the peripheral cement soil pile; the bottom of the core pile precast pile is connected with the connecting plate; the grouting bag comprises a grouting pipe which is in threaded connection with the connecting plate; the grouting bag is connected with the bottom surface of the connecting plate, and then is sunk to the designed elevation together with the precast pile of the core pile through the grouting pipe;
the grouting bag further comprises a geotechnical bag, the grouting pipe is connected with the geotechnical bag, and one end of the grouting pipe extends out of the geotechnical bag; the grouting pipe is positioned at the center of the geotechnical bag, and the axis of the grouting pipe is perpendicular to the bottom of the geotechnical bag;
the diameter of the bag body of the grouting bag after grouting of the geotechnical bag is not smaller than the maximum diameter of the soil cement composite pile; the grouting bag forms a reinforcing body to replace a cement soil pile of the non-core pile section; the height value of the grouting bag body after grouting of the geotechnical bag does not exceed the height value of the precast pile of the core pile and is not shorter than 3 times of the diameter or side length of the precast pile of the core pile.
2. A soil cement composite pile of controllable strength according to claim 1, wherein the cross-sectional dimension of the connecting plates is the same as the cross-sectional dimension of the precast pile of the core pile.
3. The combination pile of cement and soil with controllable strength as claimed in claim 1, wherein the grouting pipe is a hollow steel pipe; a threaded hole is formed in the center of the connecting plate, and external threads are formed on the outer circumference of one end part of the grouting pipe; grouting openings are uniformly formed in the outer circumference of the grouting pipe.
4. The soil cement composite pile with controllable strength according to claim 1, wherein the height value of the grouting bag after grouting is equal to the height value of the grouting pipe.
5. A soil cement composite pile of controllable strength according to claim 1, wherein the height of the connection plates is less than the height of the precast pile of the core pile.
6. The cement-soil composite pile with controllable strength according to claim 1, wherein the strength of the slurry material injected into the grouting bag is not lower than 2MPa, and cement slurry, cement soil, construction waste and cement slurry mixed slurry are adopted as the material.
7. A method for designing a cement-soil composite pile with controllable strength according to any one of claims 1 to 6, comprising the following specific steps:
the bottom of the core pile precast pile is connected with the top of the connecting plate, and the core pile precast pile and the axis of the connecting plate are coaxially arranged;
the core pile precast pile is arranged in the peripheral cement soil pile;
the grouting pipe is placed in the geotechnical bag, the grouting pipe is in sealing connection with the position of the bag opening of the geotechnical bag, and one end of the grouting pipe extends out of the geotechnical bag; an external thread is arranged at one end of the grouting pipe extending out of the geotechnical bag, a threaded hole is arranged on the connecting plate, and the grouting pipe is connected to the connecting plate through threads, so that the grouting bag is connected with the connecting plate;
the grouting bag is connected with the bottom surface of the connecting plate, and then is sunk to the designed elevation together with the precast pile of the core pile through the grouting pipe;
filling materials are injected into the geotechnical bags of the grouting bags through the grouting pipes, and then the geotechnical bags are gradually expanded to the designed size; the strength of the filling material in the geotextile bag of the grouting bag after hardening is used as the integral strength of the non-core pile section.
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CN103741683B (en) * 2013-12-23 2015-11-18 浙江天润建设有限公司 A kind of pouch expands end rigid-flexible mechanical arm and construction method
CN204645027U (en) * 2015-04-10 2015-09-16 沙焕焕 Prose style free from parallelism grouting behind shaft or drift lining strength core composite pile
CN105714825A (en) * 2016-04-28 2016-06-29 山东省建筑科学研究院 Core pile guide device suitable for cemented soil core inserting combination pile and core pile guide method
CN206784372U (en) * 2017-04-19 2017-12-22 上海市建工设计研究总院有限公司 Injection forming club-footed pile
CN108729440B (en) * 2018-05-14 2024-04-19 中航旭日（北京）岩土工程技术有限公司 Spiral high-spraying wing-expanding stirring bottom-expanding stiffness composite pile, construction method thereof and drilling machine

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