KR20070095591A - Water permeable concrete pile method - Google Patents

Water permeable concrete pile method Download PDF

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KR20070095591A
KR20070095591A KR1020060025916A KR20060025916A KR20070095591A KR 20070095591 A KR20070095591 A KR 20070095591A KR 1020060025916 A KR1020060025916 A KR 1020060025916A KR 20060025916 A KR20060025916 A KR 20060025916A KR 20070095591 A KR20070095591 A KR 20070095591A
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permeable concrete
aggregate
soft ground
concrete pile
pile
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KR1020060025916A
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Korean (ko)
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KR100790712B1 (en
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유승경
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유승경
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • F16J15/3212—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings with metal springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/908—Seal for use in rotating and reciprocating arrangement

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Abstract

A water permeable concrete pile method is provided to minimize exhaustion of natural resources and environment destruction of earth by using reclaimed aggregate instead of sand. A water permeable concrete pile method comprises steps of casting water permeable concrete slurry, which is obtained by mixing aggregate, cement and compound, in soft ground in the form of pile, and curing the water permeable concrete slurry to form a water permeable concrete pile. The water permeable concrete slurry is manufactured using reclaimed aggregate instead of aggregate. The water permeable concrete slurry is manufactured using a mixture of rubbles, gravel and reclaimed aggregate.

Description

투수콘크리트 말뚝공법 {Water permeable concrete pile method}Permeable Concrete Pile Method

도 1은 본 발명의 투수콘크리트 말뚝을 연약지반에 설치한 개요도 및 투수콘크리트 말뚝의 상세도1 is a schematic view of the pitcher concrete pile installed in the soft ground of the present invention and a detailed view of the pitcher concrete pile

도 2는 일반적인 다짐말뚝의 개요도2 is a schematic diagram of a general compaction pile

도 3은 본 발명의 투수콘크리트 말뚝을 연약지반에 설치하여 발생하는 효과를 나타내는 개요도Figure 3 is a schematic diagram showing the effect caused by installing the permeable concrete piles of the present invention on the soft ground

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

1 : 연약지반 2 : 투수콘크리트 말뚝1: Soft ground 2: Pitched concrete pile

3 : 지지층 4 : 골재3: support layer 4: aggregate

5 : 모르타르 + 연속공극 6 : 모르타르5: mortar + continuous air gap 6: mortar

7 : 연속공극 8 : 모래7: continuous void 8: sand

9 : 쇄석 혹은 자갈 10 : 팽창파괴 형상9: crushed stone or gravel 10: expanded fracture shape

11 : 성토체 12 : 간극수의 흐름11: fill body 12: flow of pore water

13 : 사전에 계산된 연약지반의 침하량13: Precalculated settlement of soft ground

본 발명은 현재 국내에서 연약지반의 개량공법으로 적용되고 있는 다짐말뚝공법들의 치명적인 단점을 보완하기 위한 새로운 연약지반개량공법에 관한 것으로, 상재하중으로 인한 다짐말뚝 선단부의 팽창파괴(Bulging Failure)의 방지와 주변지반의 미세한 토사 유입으로 인한 말뚝 표면 간극의 막힘(Clogging)현상을 극소화하는 공법을 개발하는 것이 주목적이다. 부수적으로 재생골재(순환골재)를 본 공법에 적용함으로써 기존의 다짐말뚝공법에 사용되는 건설재료의 수급으로 인해 고갈되는 천연자원의 보호와 건설재료의 품귀현상을 극복하고자 하는 것을 목적으로 한다.The present invention relates to a new soft ground improvement method to compensate for the fatal shortcomings of the compaction pile methods that are currently applied as a method for improving the soft ground in Korea, and prevents the bulging failure of the tip of the compacted pile due to the loading load. The main objective is to develop a method for minimizing the clogging of pile surface gap due to the inflow of small soils from the ground and surrounding ground. In addition, by applying recycled aggregate (circulating aggregate) to this method, it aims to protect natural resources exhausted due to the supply and demand of construction materials used in the compaction pile method and to overcome the shortage of construction materials.

본 발명은 종래의 다짐말뚝공법들의 치명적인 단점을 보완하기 위한 새로운 공법에 관한 것으로, 상재하중으로 인한 다짐말뚝 선단부의 팽창파괴(Bulging Failure)와 간극의 막힘(Clogging)현상을 방지하는 공법에 관한 것이다.The present invention relates to a new method for compensating the fatal disadvantage of the conventional compaction pile method, and to a method for preventing the bulging failure and the clogging of the gap due to the loading load. .

현재 연약점토지반의 지지력 증대와 압밀촉진을 목적으로 채택되고 있는 연약지반 개량공법에는 천연모래를 이용하는 SCP(Sand Compaction Pile)공법이 대부분을 차지하고 있다(도 2a). 그러나 SCP공법의 경우 최근 천연모래의 부족으로 인한 재료비의 급증과 환경파괴라는 쟁점으로 인해 그 적용의 한계에 다다르고 있는 실정이다.Currently, the soft ground improvement method, which is adopted for the purpose of increasing the holding capacity of the soft clay ground and promoting consolidation, is mostly made of the sand compaction pile (SCP) method using natural sand (Fig. 2a). However, in the case of the SCP method, the application of this material is approaching its limit due to the recent increase of material cost and environmental destruction due to the lack of natural sand.

최근 국내에서는 이러한 단점을 극복하기 위해 건설 발생토 중의 하나인 쇄석을 이용한 쇄석다짐말뚝(GCP)이나 독일의 Keller사에서 개발된 스톤컬럼(Stone column)을 이용한 공법의 적용에 대하여 다방면으로 검토되고 있다(도 2b). 그러나, 쇄석이나 자갈을 단순히 다져서 시공하는 이러한 공법들은 상재하중에 의한 말뚝 선단부의 팽창파괴(Bulging Failure)(10)라는 큰 약점을 지니고 있으며, 20∼40 ㎜ 입경의 쇄석 사이로 주변 연약지반의 미세한 흙 입자가 혼입되어 간극수의 이동경로를 차단하는 Clogging 현상은 연약지반의 압밀촉진효과를 크게 감소시키는 결함이 있다. 더욱이 쇄석이나 자갈 재료는 현재는 그 수급이 한정적으로 가능하여 당분간 사용될 것으로 전망되나 자연재료라는 측면에서 천연자원의 고갈과 환경파괴라는 커다란 문제점을 안고 있다. 또한, 이러한 공법들은 다짐공정으로 인한 극심한 소음공해가 유발되기 때문에 도심지나 그 인접지역에서의 시공에 큰 어려움을 안고 있다.Recently, in order to overcome these shortcomings, the application of the method of using the crushed stone compaction pile (GCP), which is one of the construction soils, or the stone column developed by Keller, Germany, has been studied in various fields. (FIG. 2B). However, these methods of simply mining crushed stone or gravel have a big weakness (Bulging Failure) (10) of pile tip due to load, and the fine soil of the surrounding soft ground between 20 ~ 40 mm particle size. Clogging phenomenon in which particles are mixed to block the movement path of the pore water has a defect that greatly reduces the consolidation promoting effect of the soft ground. Moreover, crushed stone and gravel materials are currently available for a limited time, and are expected to be used for a while, but in terms of natural materials, they have big problems such as depletion of natural resources and environmental destruction. In addition, these methods have a great difficulty in construction in the city center or adjacent areas because of the severe noise pollution caused by the compaction process.

그러므로 이러한 기존 공법들의 단점들을 극복하기 위하여서는 재료적인 측면과 기능발휘 측면, 시공방법의 측면에서의 새로운 공법 개발이 시급한 실정이다.Therefore, in order to overcome the shortcomings of these existing construction methods, it is urgent to develop new construction methods in terms of material, function, and construction methods.

한편, 최근 우리나라에서는 기존 건축 구조물의 노후화로 인하여 콘크리트 구조물의 폐기와 재건축 등이 활발하게 진행되고 있다. 이러한 현장에서 매년 기하급수적으로 다량 발생되고 있는 폐콘크리트 등의 건설폐기물 처리가 새로운 사회적 문제로 부각되고 있는 실정이다. 따라서, 천연자원의 고갈에 대비하고 지구의 환경파괴를 극소화시키며 건설폐기물을 재활용할 수 있는 재료로써 폐콘크리트를 이용하여 만든 재생골재를 이용할 필요가 있다.On the other hand, recently, in Korea, due to the aging of the existing building structure, the disposal and reconstruction of the concrete structure is being actively progressed. At such sites, the treatment of construction waste such as waste concrete, which is generated exponentially every year, is emerging as a new social problem. Therefore, it is necessary to use recycled aggregate made of waste concrete as a material capable of preparing for the depletion of natural resources, minimizing the environmental degradation of the earth and recycling construction waste.

본 발명의 목적 중 하나는 골재를 투수시멘트와 배합하여 연약지반 중에 말뚝형태로 조성시킴으로써 상부하중에 의한 말뚝의 팽창파괴(Bulging Failure)와 주변 흙 입자로 인한 말뚝 표면의 막힘 현상인 Clogging 현상을 방지하는 새로운 연약지반개량공법을 제시하는 것이다. 두 번째 목적은 현재 고갈되고 있는 모래의 대 체 재료로써 쇄석이나 건설폐기물을 재활용한 재생골재(순환골재)를 연약지반개량공법에 사용함으로써 천연자원의 고갈과 지구의 환경파괴를 극소화시키는데 일익을 담당하는데 있다.One of the objectives of the present invention is to aggregate the aggregate with the permeation cement in the form of piles in the soft ground to prevent the clogging phenomenon of clogging of the pile surface due to the bulging failure of the pile due to the upper load and the surrounding soil particles It is to propose a new soft ground improvement method. The second purpose is to use recycled aggregates (recycled aggregates) recycled from crushed stone or construction wastes as a substitute for sand, which is currently being depleted, to play a role in minimizing the depletion of natural resources and environmental degradation of the earth. have.

상기의 목적을 달성하기 위하여 단일 골재 즉, 쇄석, 자갈, 재생골재(순환골재) 중 한 가지를 시멘트 및 혼화재와 적절히 배합하여 후레쉬 투수콘크리트를 만든다. 이때 경우에 따라서는 단일 골재들을 적정한 비율로 서로 혼합하여 사용할 수 있다. 미리 제조된 후레쉬 투수콘크리트를 연약지반의 지지층까지 소정의 직경으로 천공한 후 부어 넣는다. 이때 경우에 따라서는 지상에서 이 후레쉬 투수콘크리트를 이용하여 미리 말뚝형태로 양생 제작하여 연약지반에 타설할 수 있다. 후레쉬 투수콘크리트는 소정의 기간이 지나면 지중에서 양생이 완료되므로 소요강도가 발휘되어 연약지반 상에 하중이 재하 되어도 말뚝의 팽창파괴가 발생되지 않는다. 또한 연약지반중의 간극수는 말뚝으로 유입되어 지상으로 배출되는데 이때 말뚝의 간극이 미세하므로 흙 입자로 인한 간극 막힘 현상이 발생되지 않기 때문에 원활한 배수 작용을 유지하는 것이 가능하다.In order to achieve the above object, a single aggregate, that is, one of crushed stone, gravel and recycled aggregate (circulating aggregate) is properly mixed with cement and admixture to make a fresh water-permeable concrete. In this case, a single aggregate may be mixed with each other at an appropriate ratio. Pre-prepared fresh water permeable concrete is drilled to a support layer of the soft ground to a predetermined diameter and poured. At this time, in some cases, using the fresh pitcher concrete on the ground can be cured in advance in the form of piles can be placed on the soft ground. Since the fresh pitched concrete is cured in the ground after a predetermined period of time, the required strength is exerted, so that the expansion of piles does not occur even if the load is loaded on the soft ground. In addition, the gap water in the soft ground is introduced into the pile and discharged to the ground. At this time, since the gap of the pile is fine, it is possible to maintain a smooth drainage action because the gap clogging due to the soil particles does not occur.

본 발명의 바람직한 실시 예에 대해 도면을 참고로 하여 자세하게 설명하면 다음과 같다.Preferred embodiments of the present invention will be described in detail with reference to the drawings.

도 1은 본 발명의 개요도이다. 도 1(가)는 연약지반의 지지력을 증가시키기 위해 연약지반 중에 다수의 투수콘크리트 말뚝을 지지층까지 타설한 개요도이다. 이때 필요에 따라서는 투수콘크리트 말뚝을 지지층까지 도달 시키지 않고 미리 계 산된 소정의 압밀침하 예측량 만큼 미관입 시킬 수 있다(도 3). 그 중 1본의 투수콘크리트 말뚝에 대한 상세도가 도 1(나)에 나타나 있고 도 1(다)는 투수콘크리트 말뚝의 구성을 나타내는 개요도이다. 도 1(가)와 같이 투수콘크리트 말뚝으로 개량된 연약지반 상에 흙 성토체나 건설구조물이 재하 되면 그 하중은 대부분 말뚝이 지지하게 되고 나머지 하중은 연약지반에 전달되게 된다. 이때 투수콘크리트 말뚝은 도 1(다)에서 알 수 있듯이 골재와 골재를 투수시멘트가 견고히 결합시키기 때문에 기존의 다짐말뚝보다 강성이 크므로 보다 안정적으로 하중을 지지할 수 있고 팽창파괴도 발생하지 않게 된다. 한편 연약지반으로 전달된 하중은 연약지반 중의 간극수에 압력이 발생하게 하는데, 압력이 증가한 간극수는 압력이 상대적으로 낮은 말뚝의 간극 속으로 이동하게 된다(도 3). 투수콘크리트 말뚝은 도 1(다)에서 알 수 있듯이 골재와 투수시멘트 페이스트, 연속공극으로 이루어져 있는데, 이 중 연속공극은 연약지반 속에 존재하는 간극수를 지상으로 이동시키는 배수로 역할을 하게 되어 연약지반의 배수를 촉진시킴으로써 연약지반의 강도를 증가시킨다. 이때 투수콘크리트 말뚝의 간극은 기존의 다짐말뚝의 간극보다 미세하므로 간극수와 함께 이동하는 연약지반의 미세한 흙 입자에 의한 말뚝의 간극 막힘 현상을 방지 할 수 있다.1 is a schematic diagram of the present invention. FIG. 1 (a) is a schematic diagram in which a plurality of permeable concrete piles are poured to a support layer in the soft ground to increase the bearing capacity of the soft ground. At this time, if necessary, the water-permeable concrete piles may be unintruded by a predetermined amount of pre-calculated consolidation settlement without reaching the support layer (FIG. 3). A detailed view of one permeable concrete pile is shown in Fig. 1 (b), and Fig. 1 (c) is a schematic diagram showing the structure of the permeable concrete pile. As shown in Fig. 1 (a), when the soil fillet or construction structure is loaded on the soft ground improved by the permeable concrete pile, the load is mostly supported by the pile and the remaining load is transferred to the soft ground. At this time, as the permeable concrete pile is firmly coupled with the permeation cement aggregate and aggregate as shown in FIG. 1 (C), the rigidity is greater than that of the conventional compaction pile, so that the load can be more stably supported and no expansion destruction occurs. . On the other hand, the load transmitted to the soft ground causes a pressure to be generated in the gap water in the soft ground, and the increased pore water is moved into the gap of the pile having a lower pressure (FIG. 3). The permeable concrete pile is composed of aggregate, permeable cement paste, and continuous pores, as shown in FIG. 1 (C), among which continuous pores serve as drainage to move the pore water existing in the soft ground to the ground. By increasing the strength of the soft ground. At this time, the gap of the permeable concrete pile is finer than the gap of the conventional compaction pile, so that the gap of the pile due to the fine soil particles of the soft ground moving with the number of gaps can be prevented.

전술한 기술 내용으로부터 자명하듯이, 본 발명의 투수콘크리트 말뚝공법은 투수시멘트의 경화작용으로 인하여 말뚝의 강성이 기존의 다짐말뚝보다 크게 되어 상재하중으로 인한 팽창파괴가 발생하지 않으며, 말뚝 표면의 간극이 미세하게 되 어 주변 연약지반의 미세한 흙 입자에 의한 말뚝의 간극 막힘 현상이 방지된다. 또한, 재생골재를 건설재료로 활용함으로 인해 현재 급등하고 있는 건설재료비를 현격히 저하 시킬 수 있으므로 환경문제의 해결과 더불어 건설비용절감이라는 일석이조의 효과를 얻을 수 있다.As is apparent from the above description, the permeable concrete pile method of the present invention has a rigidity of the pile due to the hardening action of the permeation cement, so that the expansion fracture due to the loading load does not occur because the pile strength is larger than the existing compaction pile. This fineness prevents the clogging of the gap due to the fine soil particles in the surrounding soft ground. In addition, the use of recycled aggregates can significantly reduce the cost of construction materials, which is soaring, and thus can solve the environmental problems and reduce the cost of construction.

Claims (5)

연약지반의 지지력 증가 및 압밀 촉진을 목적으로 개량함에 있어서 단일의 골재를 그대로 타설하는 기존의 다짐말뚝공법과는 달리,Unlike the conventional compaction pile method, in which a single aggregate is poured as it is, in order to improve the bearing capacity of the soft ground and promote consolidation, 골재(쇄석 혹은 자갈)와 시멘트, 혼화재를 배합하여 만든 투수콘크리트 슬러리를 연약지반 중에 말뚝모양으로 타설한 후 양생시켜 연약지반 중에 투수콘크리트 말뚝을 형성시키는 방법을 이용한 투수콘크리트 말뚝 공법.Permeable concrete pile method using the method of forming permeable concrete pile in soft ground by pouring permeable concrete slurry made by mixing aggregate (crushed stone or gravel) with cement and admixture into soft ground. 청구항 1에 있어서, 미리 지상에서 상기의 투수콘크리트 슬러리를 이용하여 투수콘크리트 말뚝을 제작하여 연약지반 중에 타입하는 방법을 이용한 투수콘크리트 말뚝 공법.The method of claim 1, wherein the permeable concrete pile method using a method of producing a permeable concrete pile using the permeable concrete slurry on the ground in advance in the soft ground. 청구항 1에 있어서, 상기의 투수콘크리트 슬러리 제작 시 골재를 재생골재(순환골재)로 대체하여 사용하는 단계를 포함한 투수콘크리트 말뚝 공법.The method according to claim 1, Permeable concrete pile method comprising the step of replacing the aggregate with recycled aggregate (circulating aggregate) used when producing the permeable concrete slurry. 청구항 1에 있어서, 상기의 투수콘크리트 슬러리 제작 시 골재를 쇄석, 자갈, 재생골재(순환골재)의 혼합물로 대체하여 사용하는 단계를 포함한 투수콘크리트 말뚝 공법.The method according to claim 1, Permeable concrete pile method comprising the step of replacing the aggregate with a mixture of crushed stone, gravel, recycled aggregate (circulating aggregate) when producing the permeable concrete slurry. 청구항 1에 있어서, 상기의 투수콘크리트 말뚝을 연약지반 중에 타설 시 미 리 계산된 연약지반의 소정의 침하량만큼 미관입 시키는 단계를 포함한 투수콘크리트 말뚝 공법.The method according to claim 1, Permeable concrete pile method comprising the step of not penetrating the predetermined amount of pre-calculated soft ground at the time of placing the permeable concrete pile in the soft ground.
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CN105064426A (en) * 2015-09-08 2015-11-18 深圳市路桥建设集团有限公司 Indoor testing device for minitype grouting gravel steel pipe piles and testing method of indoor testing device
CN111074883A (en) * 2020-02-25 2020-04-28 周同和 Post-grouting permeable concrete pipe pile and construction method thereof

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KR101073695B1 (en) 2008-11-26 2011-10-14 (주)지구환경전문가그룹 A drainage system for soft ground
KR100961917B1 (en) 2010-02-19 2010-06-10 현대건설주식회사 Aggradation prevention type river with hydro-conductive pile

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KR100438038B1 (en) 2002-03-14 2004-07-01 추중팔 Concrete Pile Method Made of Drainage Stone Column
KR20040091468A (en) * 2003-04-22 2004-10-28 주식회사 포스코 Stone column method using convert slag
KR100736631B1 (en) * 2004-03-30 2007-07-06 김창근 Permanent underdrainage structure and permanent underdrainage method of construction of ground

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CN105064426A (en) * 2015-09-08 2015-11-18 深圳市路桥建设集团有限公司 Indoor testing device for minitype grouting gravel steel pipe piles and testing method of indoor testing device
CN105064426B (en) * 2015-09-08 2017-03-29 深圳市路桥建设集团有限公司 Miniature slip casting rubble steel-pipe pile laboratory testing rig and its test method
CN111074883A (en) * 2020-02-25 2020-04-28 周同和 Post-grouting permeable concrete pipe pile and construction method thereof

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