CN114809015B - Temporary support system and permanent structure combined construction method for open cut subway station - Google Patents
Temporary support system and permanent structure combined construction method for open cut subway station Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
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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
- E02D5/24—Prefabricated piles
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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
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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Abstract
本发明公开了一种明挖地铁站临时支护体系与永久结构结合施工方法,施工步骤包括以下:施工基坑的围护桩机结构;基坑局部的开挖;基坑整体的开挖;铺设垫层及防水层。采用明挖法修建的地铁车站提供了一种“永临合一”的绿色设计理念,它将传统的围护结构临时支撑体系与车站永久结构采用“预制+现浇”的方法进行工艺结合,构建了一种新型车站叠合结构体系,它能够有效地解决传统技术中临时内支撑构件后拆除浪费、围护桩发挥不了后期作用、基坑施工中机械和泥浆环境污染严重等诸多问题和弊端,而且避免了拆撑导致的基坑失稳等风险,是一种绿色的、安全的结构设计体系,在施工实践过程具有较强的适用性。
The invention discloses a construction method combining a temporary support system and a permanent structure of an open-cut subway station. The construction steps include the following steps: constructing a surrounding pile machine structure for a foundation pit; excavating a part of the foundation pit; and excavating the entire foundation pit; Lay the underlayment and waterproof layer. The subway station built by the cut-and-open method provides a green design concept of "integration of eternal and temporary", which combines the traditional temporary support system of the enclosure structure with the permanent structure of the station using the method of "prefabrication + cast-in-place". A new type of station superimposed structure system was constructed, which can effectively solve many problems and disadvantages in the traditional technology, such as the waste of temporary internal support components after dismantling, the inability of the retaining piles to play a later role, and the serious environmental pollution of machinery and mud during foundation pit construction. , and avoid the risk of foundation pit instability caused by the removal of supports, it is a green and safe structural design system, which has strong applicability in the construction practice process.
Description
技术领域technical field
本发明涉及建筑结构技术领域,具体为一种明挖地铁站临时支护体系与永久结构结合施工方法。The invention relates to the technical field of building structures, in particular to a construction method combining a temporary support system and a permanent structure of an open-cut subway station.
背景技术Background technique
目前国内常见的地铁明挖车站基坑支护结构形式较为单一,主要是以传统的“灌注围护桩”为典型代表的桩撑体系或桩锚体系,明挖法围护结构一般为钻孔灌注桩、咬合灌注桩或地连墙,临时内支撑体系包含横向水平支撑和竖向支撑,其中横向水平支撑主要包括钢筋混凝土支撑、钢管支撑、型钢支撑、水平连系梁等,第一道多为混凝土支撑,纵向间距6~9m,设置于围护桩的冠梁高度,其余为钢支撑,根据基坑垂直开挖高度设置2~3道,竖向支撑主要为钢格构柱,水平联系梁将横向水平支撑与格构柱连接起来,形成整体内支撑体系,施工期间与围护结构共同抵抗外部岩体、土体及水压力侧向荷载,确保基坑支护的稳定性和安全性。At present, the foundation pit support structure of subway open-cut stations in China is relatively simple, mainly based on the traditional "poured enclosure pile" as the typical representative pile support system or pile-anchor system, and the open-cut enclosure structure is generally bored For cast-in-place piles, occlusal cast-in-place piles or ground connection walls, the temporary internal support system includes horizontal horizontal supports and vertical supports, of which the horizontal horizontal supports mainly include reinforced concrete supports, steel pipe supports, section steel supports, horizontal tie beams, etc. Concrete support with a longitudinal spacing of 6-9m is set at the height of the crown beam of the retaining pile, and the rest are steel supports. 2-3 lines are set according to the vertical excavation height of the foundation pit. The vertical support is mainly steel lattice columns, and the horizontal connection The beam connects the horizontal support and the lattice column to form an overall internal support system. During the construction period, together with the enclosure structure, it resists the lateral load of the external rock mass, soil mass and water pressure, ensuring the stability and safety of the foundation pit support. .
但上述工法中内支撑体系均作为临时性支撑构件,后期将全部拆除,车站主体二衬结构完成后,基坑围护支撑体系多数情况下失去原有的作用,可以说传统工法的基坑支护理念为“永临分离”思想,同时该传统施工工法中存在着许多问题及弊端,比如钻孔成孔速度慢,易塌孔,成本高、工期长、临时结构后期拆除导致资源浪费、泥浆及机械噪声引起的环境污染较为严重,为此提出一种明挖地铁站临时支护体系与永久结构结合施工方法。However, in the above-mentioned construction methods, the internal support system is used as a temporary support component, and will be completely dismantled later. After the main secondary lining structure of the station is completed, the foundation pit enclosure and support system loses its original function in most cases. It can be said that the foundation pit support system of the traditional construction method The concept of protection is the idea of "eternal separation". At the same time, there are many problems and disadvantages in this traditional construction method, such as slow drilling speed, easy hole collapse, high cost, long construction period, waste of resources caused by the demolition of temporary structures later, mud The environmental pollution caused by mechanical noise and mechanical noise is relatively serious. For this reason, a construction method combining temporary support system and permanent structure of open-cut subway station is proposed.
发明内容Contents of the invention
(一)解决的技术问题(1) Solved technical problems
针对现有技术的不足,本发明提供了一种明挖地铁站临时支护体系与永久结构结合施工方法,以解决上述背景技术中提出的问题。Aiming at the deficiencies of the prior art, the present invention provides a construction method combining a temporary support system and a permanent structure of an open-cut subway station to solve the problems raised in the above-mentioned background technology.
(二)技术方案(2) Technical solution
为实现上述目的,本发明提供如下技术方案:一种明挖地铁站临时支护体系与永久结构结合施工方法,包括0-中低强度混合浆液、1-预制桩、2-结构内衬侧墙、3-钢筋连接器、4-现浇结构冠梁、5-(1)-预制薄板单元、5-(2)-现浇横向水平支撑、6后浇结构顶板、7-(1)先浇顶纵梁、7-(2)后浇顶纵梁、8-(1)预制柱芯、8-(2)外包现浇层、9-临时钢管支撑、10-钻孔灌注混凝土桩、11-钢连梁槽钢组合结构、12-主体底板及底纵梁结构、13-主体中板及中纵梁结构,其施工步骤包括以下:In order to achieve the above purpose, the present invention provides the following technical solutions: a construction method combining temporary support system and permanent structure of an open-cut subway station, including 0-medium and low-strength mixed grout, 1-prefabricated pile, 2-structure lining side wall , 3-Rebar connector, 4-Crown beam of cast-in-place structure, 5-(1)-Prefabricated thin-slab unit, 5-(2)-Cast-in-place horizontal horizontal support, 6-Post-cast structural roof, 7-(1) Pre-cast Top longitudinal beam, 7-(2) Post-cast roof longitudinal beam, 8-(1) Prefabricated column core, 8-(2) Outsourcing cast-in-place layer, 9-Temporary steel pipe support, 10-Drilled concrete pile, 11- Steel connecting beam channel steel composite structure, 12-main body bottom plate and bottom longitudinal beam structure, 13-main body mid-plate and middle longitudinal beam structure, the construction steps include the following:
S01、施工基坑的围护桩结构;S01. The surrounding pile structure of the construction foundation pit;
S02、基坑局部的开挖;S02. Partial excavation of foundation pit;
S03、基坑整体的开挖;S03. Excavation of the foundation pit as a whole;
S04、铺设垫层及防水层;S04, laying cushion and waterproof layer;
S05、拆除与连接后的叠合浇筑;S05. Superimposed pouring after dismantling and connection;
S06、形成的“预制+现浇”叠合梁板永久结构体系;S06. The formed "prefabricated + cast-in-place" composite beam-slab permanent structure system;
S07、顶板上部覆土回填,恢复路面交通。S07. Backfill the top of the roof with soil to restore road traffic.
优选的,根据步骤S01中所提出的,施工基坑外侧止水帷幕,然后基坑开挖至现浇结构冠梁 4的底标高,开始施工基坑围护桩结构;Preferably, according to what is proposed in step S01, construct the outside water-stop curtain of the foundation pit, then excavate the foundation pit to the bottom elevation of the cast-in-place
实施时:When implemented:
预制桩1及预制柱芯8-(1)在工厂提前批量预制生产,构件生产过程中先提前预埋好钢筋连接器3,然后将预制构件运输至施工现场,待围护桩钻孔施工完毕后,通过机械吊装和接送桩定位平台将预制桩1及预制柱芯8-(1)精准下放入钻孔,其中钻孔孔壁与预制桩1之间的空隙自下而上均匀灌注一种中低强度的混合浆液0;Prefabricated
钻孔孔壁与预制柱芯8-(1)之间空隙在底板纵梁以下长度灌注C25及以上强度混凝土形成钻孔灌注混凝土桩10,形成嵌固端;The gap between the borehole wall and the prefabricated column core 8-(1) is poured with C25 and above-strength concrete at the length below the longitudinal beam of the floor to form a
钻孔孔壁与预制柱芯8-(1)之间空隙在底板纵梁以上长度灌注粗砂回填密实。The gap between the borehole wall and the prefabricated column core 8-(1) is backfilled with coarse sand over the length above the longitudinal beam of the bottom plate.
优选的,根据步骤S02中所提出的,预制桩 1及预制柱芯 8-(1)施工完成后,对现浇横向水平支撑 5-(2)及先浇顶纵梁 7-(1)进行定位放线,开始基坑局部开挖,直至开挖至上述支撑及纵梁的设计标高,铺设薄垫层,然后处理预制柱芯8-(1)顶部钢筋接头连接,绑扎上述支撑及现浇结构冠梁 4 的钢筋,最后进行上述构件的混凝土整体浇筑,形成施工阶段的现浇横向水平支撑 5-(2)、先浇顶纵梁 7-(1)及预制柱芯 8-(1)刚性连接的内支撑组合体系。Preferably, according to the proposal in step S02, after the construction of the
优选的,根据步骤S03中所提出的,从上往下继续基坑开挖,直至基坑底部,分别架设第二道及第三道临时钢管支撑9、钢连梁槽钢组合结构11,直至完成整个基坑支撑体系,同时,基坑开挖在靠近预制桩1时,采用人工方式将预制桩 1 内侧包裹的中低强度混合浆液0凿除,使得桩墙叠合接触面及钢筋连接器3外露。Preferably, according to the proposal in step S03, the excavation of the foundation pit is continued from top to bottom until the bottom of the foundation pit, and the second and third temporary steel pipe supports 9 and steel connecting beam and channel steel combined
优选的,根据步骤S04中所提出的,浇筑主体底板及底纵梁结构12,拆除第三道临时钢管支撑9,搭设模板支架体系,采用“预制+现浇”方式将预制桩1与结构内衬侧墙2叠合形成叠合墙,预制柱芯8-(1)与外包现浇层8-(2)叠合形成叠合柱;Preferably, according to the proposal in step S04, the main bottom plate and the bottom longitudinal beam structure 12 are poured, the third temporary
上述叠合墙、叠合柱与主体中板及中纵梁结构13组合形成负二层框架结构体系;The combination of the above-mentioned laminated walls, laminated columns, the main body middle plate and the middle
具体叠合工艺为以下:The specific lamination process is as follows:
①、预制柱芯8-(1)的负二层高度范围凿毛清洗和钢筋接驳连接,与柱芯外包现浇层8-(2)进行浇筑叠合;①. The height range of the negative second floor of the prefabricated column core 8-(1) is chiseled and cleaned and the steel bars are spliced and connected, and it is poured and superimposed with the column core outsourcing cast-in-place layer 8-(2);
②、负二层结构内衬侧墙2与预制桩1的接合面为凹型储槽粗糙面,其凹凸深度>6mm,并清洗干净,墙受力钢筋通过钢筋连接器3与预制桩1连接并浇筑叠合;②. The joint surface of the inner
上述叠合墙、叠合柱与主体中板及中纵梁结构13采用现浇方式完成;The above-mentioned laminated wall, laminated column, main body middle plate and middle
预制柱芯8-(1)的预埋锚为HPB300钢筋,直径为8-12mm,其在预制阶段需弯折入混凝土保护层中,施工柱芯外包现浇层8-(2)时,应将混凝土保护层凿除,将预埋锚筋顺直并与外包后浇层8-(2)的竖向受力钢筋连接锚固。The embedded anchor of the prefabricated column core 8-(1) is HPB300 steel bar with a diameter of 8-12mm, which needs to be bent into the concrete protective layer during the prefabrication stage. The concrete protective layer is chiseled off, and the pre-embedded anchor bar is straightened and connected with the vertical stress steel bar of the outsourcing post-casting layer 8-(2).
优选的,根据步骤S05中所提出的,拆除第二道临时钢管支撑9,车站负一层两侧结构内衬侧墙2与预制桩1通过钢筋连接器3连接后进行浇筑形成叠合墙,墙体上端设置侧墙牛腿,负一层预制柱芯8-(1)与外包现浇层8-(2)浇筑叠合形成叠合柱,其叠合工艺与步骤S04中的叠合工艺相同。Preferably, according to what is proposed in step S05, the second temporary
优选的,根据步骤S06中所提出的,顶板纵向连续铺设预制薄板单元5-(1),两端分别搭设在结构内衬墙2上端牛腿及先浇顶纵梁7-(1)边牛腿,上述牛腿作为预制薄板单元5-(1)的支撑铰节点,预制薄板单元 5-(1)作为上部后浇层的底部模板并兼做永久顶板的一部分,铺设绑扎后浇结构顶板6、后浇顶纵梁7-(2)的受力钢筋,并做好预制结构与后浇结构接触粗糙面的凿毛处理后,分层连续浇筑混凝土,形成由预制薄板单元 5-(1)、先浇顶纵梁7-(1)、后浇顶纵梁 7-(2)、后浇结构顶板6等构件组合而成的“预制+现浇”叠合梁板永久结构体系。Preferably, according to the proposal in step S06, the prefabricated thin plate unit 5-(1) is laid longitudinally and continuously on the roof, and the two ends are respectively erected on the upper corbel of the
优选的,根据步骤S01以及S02中所提出的,采用“围护桩+内支撑”体系的明挖地铁车站,该种叠合结构体系需在地质的岩质层或土质地层。Preferably, according to the proposals in steps S01 and S02, the open-cut subway station adopts the "enclosure pile + internal support" system, and this kind of superimposed structure system needs to be in the geological rock layer or soil layer.
优选的,预制薄板单元5-(1)的厚度尺寸为顶板高度尺寸的1.5倍以内,预制板的宽度尺寸为横向支撑间距尺寸的1/3以内。Preferably, the thickness dimension of the prefabricated thin plate unit 5-(1) is within 1.5 times of the height dimension of the top plate, and the width dimension of the prefabricated plate is within 1/3 of the distance dimension of the transverse support.
(三)有益效果(3) Beneficial effects
与现有技术相比,本发明提供了一种明挖地铁站临时支护体系与永久结构结合施工方法,具备以下有益效果:Compared with the prior art, the present invention provides a construction method combining a temporary support system and a permanent structure of an open-cut subway station, which has the following beneficial effects:
1、本发明为采用明挖法修建的地铁车站提供了一种“永临合一”的绿色设计理念,它将传统的围护结构临时支撑体系与车站永久结构采用“预制+现浇”的方法进行工艺结合,构建了一种新型车站叠合结构体系,它能够有效地解决传统技术中临时内支撑构件后拆除浪费、围护桩发挥不了后期作用、基坑施工中机械和泥浆环境污染严重等诸多问题和弊端,而且避免了拆撑导致的基坑失稳等风险,是一种绿色的、安全的结构设计体系,在施工实践过程具有较强的适用性。1. The present invention provides a green design concept of "integration of permanent and temporary" for the subway station built by the open-cut method, which adopts the "prefabricated + cast-in-place" combination of the traditional temporary support system of the enclosure structure and the permanent structure of the station Methods Combining technology, a new type of station superimposed structure system is constructed, which can effectively solve the waste of temporary internal support components in the traditional technology, the enclosure piles cannot play the role in the later stage, and the machinery and mud environment pollution during foundation pit construction is serious It is a green and safe structural design system that has strong applicability in the construction practice process.
2.本发明采用“临时支护体系与永久结构结合”的新型叠合结构体系是一种快速安全高效施工方法,围护预制桩、预制柱芯、预制板等构件均采用工厂化批量生成,不受施工场地及专业交叉干扰,工效大幅提高。与传统技术工法相比,预制叠合桩施工一般节约工期40-50%,预制薄板代替统一的满堂盘扣模板支架体系,既安全又能保证混凝土表观质量,作业时间能节省约8-15%,该叠合结构体系减少了人力、工时的损耗,节省时间与空间,节约造价,具有较好的经济性。2. This invention adopts a new superimposed structure system of "combination of temporary support system and permanent structure", which is a fast, safe and efficient construction method. Prefabricated piles, prefabricated column cores, prefabricated slabs and other components are all produced in factory batches. It is not subject to cross-interference from construction sites and professions, and the work efficiency is greatly improved. Compared with traditional technical construction methods, the construction of prefabricated composite piles generally saves 40-50% of the construction period. Prefabricated thin slabs replace the unified full-hole buckle formwork support system, which is safe and can ensure the apparent quality of concrete. The operating time can save about 8-15 %, the superimposed structure system reduces the loss of manpower and working hours, saves time and space, saves cost, and has good economy.
3.本发明所述施工工序明确,操作简单,在明挖地铁车站中地下水位不高的条件下可实施性较强。3. The construction procedure of the present invention is clear, the operation is simple, and the implementability is strong under the condition that the underground water level is not high in the open-cut subway station.
附图说明Description of drawings
图1为本发明方法步骤示意图;Fig. 1 is a schematic diagram of the steps of the method of the present invention;
图2为本发明车站“临时支撑体系与永久结构叠合”新型复合结构体系整体示意图;Fig. 2 is the overall schematic diagram of the new composite structure system of "temporary support system and permanent structure superposition" of the station of the present invention;
图3为本发明车站横向水平支撑、顶板及顶纵梁“永临叠合”局部示意图;Fig. 3 is a partial schematic diagram of the station's horizontal horizontal support, roof and top longitudinal beam "perpetually superimposed" in the present invention;
图4为本发明预制桩与主体侧墙叠合钢筋连接构造示意图;Fig. 4 is a schematic diagram of the connection structure between the prefabricated pile and the main side wall of the superimposed steel bar of the present invention;
图5为本发明预制板、后浇顶板、顶纵梁等构件叠合钢筋连接构造示意图;Fig. 5 is a schematic diagram of the connection structure of superimposed steel bars of prefabricated slabs, post-cast roofs, roof longitudinal beams and other components of the present invention;
图6为本发明顶纵梁与预制柱芯叠合接触面钢筋构造平面图;Fig. 6 is a plan view of the reinforced contact surface of the top longitudinal beam and the prefabricated column core of the present invention;
图7为本发明预制柱芯与外包后浇层钢筋连接构造平面。Fig. 7 is the connection construction plane between the prefabricated column core and the outsourcing post-casting layer steel bar of the present invention.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明提供一个技术方案,如图1-7所示,一种明挖地铁站临时支护体系与永久结构结合施工方法,包括0-中低强度混合浆液、1-预制桩、2-结构内衬侧墙、3-钢筋连接器、4-现浇结构冠梁、5-(1)-预制薄板单元、5-(2)-现浇横向水平支撑、6后浇结构顶板、7-(1)先浇顶纵梁、7-(2)后浇顶纵梁、8-(1)预制柱芯、8-(2)外包现浇层、9-临时钢管支撑、10-钻孔灌注混凝土桩、11-钢连梁槽钢组合结构、12-主体底板及底纵梁结构、13-主体中板及中纵梁结构,其施工步骤包括以下:The present invention provides a technical solution, as shown in Figures 1-7, a construction method for combining temporary support systems and permanent structures in open-cut subway stations, including 0-medium and low-strength mixed grout, 1-prefabricated piles, and 2-structure inner Lining side wall, 3- steel bar connector, 4- cast-in-place structure crown beam, 5-(1)- prefabricated thin plate unit, 5-(2)- cast-in-place horizontal horizontal support, 6 post-cast structure roof, 7-(1 ) first pouring roof longitudinal beam, 7-(2) post-casting roof longitudinal beam, 8-(1) prefabricated column core, 8-(2) outsourcing cast-in-place layer, 9-temporary steel pipe support, 10-drilled concrete pile , 11-steel connecting beam channel steel combined structure, 12-main body floor and bottom longitudinal beam structure, 13-main body mid-plate and middle longitudinal beam structure, the construction steps include the following:
S01、施工基坑的围护桩结构;S01. The surrounding pile structure of the construction foundation pit;
S02、基坑局部的开挖;S02. Partial excavation of foundation pit;
S03、基坑整体的开挖;S03. Excavation of the foundation pit as a whole;
S04、铺设垫层及防水层;S04, laying cushion and waterproof layer;
S05、拆除与连接后的叠合浇筑;S05. Superimposed pouring after dismantling and connection;
S06、形成的“预制+现浇”叠合梁板永久结构体系;S06. The formed "prefabricated + cast-in-place" composite beam-slab permanent structure system;
S07、顶板上部覆土回填,恢复路面交通。S07. Backfill the top of the roof with soil to restore road traffic.
优选的,根据步骤S01中所提出的,施工基坑外侧止水帷幕,然后基坑开挖至现浇结构冠梁 4的底标高,开始施工基坑围护桩结构;Preferably, according to what is proposed in step S01, construct the outside water-stop curtain of the foundation pit, then excavate the foundation pit to the bottom elevation of the cast-in-place
实施时:When implemented:
预制桩1及预制柱芯8-(1)在工厂提前批量预制生产,构件生产过程中先提前预埋好钢筋连接器3,然后将预制构件运输至施工现场,待围护桩钻孔施工完毕后,通过机械吊装和接送桩定位平台将预制桩1及预制柱芯8-(1)精准下放入钻孔,其中钻孔孔壁与预制桩1之间的空隙自下而上均匀灌注一种中低强度的混合浆液0;
钻孔孔壁与预制柱芯8-(1)之间空隙在底板纵梁以下长度灌注C25及以上强度混凝土形成钻孔灌注混凝土桩10,形成嵌固端;The gap between the borehole wall and the prefabricated column core 8-(1) is poured with C25 and above-strength concrete at the length below the longitudinal beam of the floor to form a bored
钻孔孔壁与预制柱芯8-(1)之间空隙在底板纵梁以上长度灌注粗砂回填密实。The gap between the borehole wall and the prefabricated column core 8-(1) is backfilled with coarse sand over the length above the longitudinal beam of the bottom plate.
优选的,根据步骤S02中所提出的,预制桩 1及预制柱芯 8-(1)施工完成后,对现浇横向水平支撑 5-(2)及先浇顶纵梁 7-(1)进行定位放线,开始基坑局部开挖,直至开挖至上述支撑及纵梁的设计标高,铺设薄垫层,然后处理预制柱芯8-(1)顶部钢筋接头连接,绑扎上述支撑及现浇结构冠梁 4 的钢筋,最后进行上述构件的混凝土整体浇筑,形成施工阶段的现浇横向水平支撑 5-(2)、先浇顶纵梁 7-(1)及预制柱芯 8-(1)刚性连接的内支撑组合体系。Preferably, according to the proposal in step S02, after the construction of the
优选的,根据步骤S03中所提出的,从上往下继续基坑开挖,直至基坑底部,分别架设第二道及第三道临时钢管支撑9、钢连梁槽钢组合结构11,直至完成整个基坑支撑体系,同时,基坑开挖在靠近预制桩1时,采用人工方式将预制桩 1 内侧包裹的中低强度混合浆液0凿除,使得桩墙叠合接触面及钢筋连接器3外露。Preferably, according to the proposal in step S03, the excavation of the foundation pit is continued from top to bottom until the bottom of the foundation pit, and the second and third temporary steel pipe supports 9 and steel connecting beam and channel steel combined
优选的,根据步骤S04中所提出的,浇筑主体底板及底纵梁结构12,拆除第三道临时钢管支撑9,搭设模板支架体系,采用“预制+现浇”方式将预制桩1与结构内衬侧墙2叠合形成叠合墙,预制柱芯8-(1)与外包现浇层8-(2)叠合形成叠合柱;Preferably, according to the proposal in step S04, the main bottom plate and the bottom longitudinal beam structure 12 are poured, the third temporary
上述叠合墙、叠合柱与主体中板及中纵梁结构13组合形成负二层框架结构体系;The combination of the above-mentioned laminated walls, laminated columns, the main body middle plate and the middle
具体叠合工艺为以下:The specific lamination process is as follows:
①、预制柱芯8-(1)的负二层高度范围凿毛清洗和钢筋接驳连接,与柱芯外包现浇层8-(2)进行浇筑叠合;①. The height range of the negative second floor of the prefabricated column core 8-(1) is chiseled and cleaned and the steel bars are spliced and connected, and it is poured and superimposed with the column core outsourcing cast-in-place layer 8-(2);
②、负二层结构内衬侧墙2与预制桩1的接合面为凹型储槽粗糙面,以增强新旧混凝土的粘接力,保证共同受力,其凹凸深度>6mm,并清洗干净,墙受力钢筋通过钢筋连接器3与预制桩1连接并浇筑叠合;②. The joint surface of the inner
上述叠合墙、叠合柱与主体中板及中纵梁结构13采用现浇方式完成;The above-mentioned laminated wall, laminated column, main body middle plate and middle
预制柱芯8-(1)的预埋锚为HPB300钢筋,直径为8-12mm,便于弯折,其在预制阶段需弯折入混凝土保护层中,施工柱芯外包现浇层8-(2)时,应将混凝土保护层凿除,将预埋锚筋顺直并与外包后浇层8-(2)的竖向受力钢筋连接锚固。The embedded anchor of the prefabricated column core 8-(1) is HPB300 steel bar with a diameter of 8-12mm, which is easy to bend. It needs to be bent into the concrete protective layer during the prefabrication stage, and the construction column core is covered with the cast-in-place layer 8-(2 ), the concrete protective layer should be chiseled off, and the pre-embedded anchor bar should be straightened and connected and anchored with the vertical stressed steel bar of the outsourcing post-casting layer 8-(2).
优选的,根据步骤S05中所提出的,拆除第二道临时钢管支撑9,车站负一层两侧结构内衬侧墙2与预制桩1通过钢筋连接器3连接后进行浇筑形成叠合墙,墙体上端设置侧墙牛腿,负一层预制柱芯8-(1)与外包现浇层8-(2)浇筑叠合形成叠合柱,其叠合工艺与步骤S04中的叠合工艺相同。Preferably, according to what is proposed in step S05, the second temporary
优选的,根据步骤S06中所提出的,顶板纵向连续铺设预制薄板单元5-(1),两端分别搭设在内衬墙2上端牛腿及先浇顶纵梁7-(1)边牛腿,上述牛腿作为预制薄板单元5-(1)的支撑铰节点,预制薄板单元 5-(1)作为上部后浇层的底部模板并兼做永久顶板的一部分,铺设绑扎后浇结构顶板6、后浇顶纵梁7-(2)的受力钢筋,并做好预制结构与后浇结构接触粗糙面的凿毛处理后,分层连续浇筑混凝土,形成由预制薄板单元 5-(1)、先浇顶纵梁7-(1)、后浇顶纵梁 7-(2)、后浇结构顶板6等构件组合而成的“预制+现浇”叠合梁板永久结构体系,共同承担外部全部荷载。Preferably, according to the proposal in step S06, the prefabricated thin plate unit 5-(1) is laid longitudinally and continuously on the roof, and the two ends are respectively erected on the upper corbel of the
优选的,根据步骤S01以及S02中所提出的,采用“围护桩+内支撑”体系的明挖地铁车站,该种叠合结构体系需在地质的岩质层或土质地层。Preferably, according to the proposals in steps S01 and S02, the open-cut subway station adopts the "enclosure pile + internal support" system, and this kind of superimposed structure system needs to be in the geological rock layer or soil layer.
优选的,预制薄板单元5-(1)的厚度尺寸为顶板高度尺寸的1.5倍以内,预制板的宽度尺寸为横向支撑间距尺寸的1/3以内,在满足施工阶段的受力前提下,最大限度的减轻构件重量,便于机械吊装,为控制挠度变形,预制板可以为施加一定预应力的预制构件。Preferably, the thickness of the prefabricated thin-slab unit 5-(1) is within 1.5 times the height of the roof, and the width of the prefabricated slab is within 1/3 of the distance between the lateral supports. The weight of components can be reduced to a minimum, which is convenient for mechanical hoisting. In order to control deflection and deformation, prefabricated panels can be prefabricated components with a certain prestress.
本装置的工作原理:首先明挖地铁车站根据地层特点在基坑支护方案上选用“围护桩+内支撑”支护体系,施工阶段的临时支护组合体系主要为:中低强度混合浆液0、预制桩1、现浇横向水平支撑5-(2)、先浇顶纵梁7-(1),预制柱芯8-(1)钻孔灌注混凝土桩10等构件组成的施工阶段临时支护组合体系后期不再拆除,而是作为永久结构的一部分,待与后浇结构叠合后,参与后期使用阶段的受力,同时发挥两个阶段作用,临时钢管支撑9,钻孔灌注混凝土桩10,钢连梁槽钢组合结构11,上述施工阶段组合体系中的各个构件均兼做长期使用阶段中永久结构的一部分,在与内衬结构叠合后共同形成永久结构;The working principle of this device: Firstly, the open-cut subway station adopts the support system of "surrounding pile + internal support" in the foundation pit support scheme according to the characteristics of the stratum. The temporary support combination system in the construction stage is mainly: medium and low strength mixed grout 0.
基坑支护方案确定后,先做好施工围挡及交通疏解,再进行基坑开挖与支护,具体施工步骤如下:After the foundation pit support plan is determined, the construction enclosure and traffic relief shall be done first, and then the foundation pit excavation and support shall be carried out. The specific construction steps are as follows:
施工步骤一:先施工基坑外侧止水帷幕,然后基坑开挖至现浇结构冠梁 4的底标高,开始施工基坑围护桩结构,即:预制桩1及预制柱芯8-(1)在工厂提前批量预制生产,构件生产过程中先提前预埋好钢筋连接器3,然后将预制构件运输至施工现场,待围护桩钻孔施工完毕后,通过机械吊装和接送桩定位平台将预制桩1及预制柱芯8-(1)精准下放入钻孔,其中钻孔孔壁与预制桩1之间的空隙自下而上均匀灌注一种中低强度的混合浆液0,钻孔孔壁与预制柱芯8-(1)之间空隙在底板纵梁以下长度灌注C25及以上强度混凝土形成钻孔灌注混凝土桩10,形成嵌固端,钻孔孔壁与预制柱芯8-(1)之间空隙在底板纵梁以上长度灌注粗砂回填密实;Construction step 1: first construct the water-stop curtain outside the foundation pit, then excavate the foundation pit to the bottom elevation of the cast-in-place
施工步骤二:基坑围护预制桩1及预制柱芯8-(1)施工完成后,对横向水平支撑5-(2)及先浇顶纵梁7-(1)进行定位放线,开始基坑局部开挖,直至开挖至上述支撑及纵梁的设计标高,铺设薄垫层,然后处理预制柱芯8-(1)顶部钢筋接头连接,绑扎上述支撑及冠梁4的钢筋,最后进行上述构件的混凝土整体浇筑,形成施工阶段的横向支撑5-(2)、纵向连系梁7-(1)及竖向支撑8-(1)刚性连接的内支撑组合体系,该内支撑体系与预制桩1共同作用,确保基坑开挖稳定性及安全;Construction step 2: After the construction of
施工步骤三:从上往下继续基坑开挖,直至基坑底部,分别架设第二道及第三道临时钢管支撑9、钢连梁槽钢组合结构11,直至完成整个基坑支撑体系,同时,基坑开挖在靠近预制桩1时,采用人工方式将预制桩 1 内侧包Construction step 3: Continue excavating the foundation pit from top to bottom until the bottom of the foundation pit, erect the second and third temporary steel pipe supports 9 and the steel connecting beam channel
裹的中低强度混合浆液0凿除,使得桩墙叠合接触面及钢筋连接器3外露;The wrapped medium and low strength mixed grout 0 is chiseled off, so that the stacked contact surface of the pile wall and the
施工步骤四:铺设垫层及防水层,浇筑主体底板及底纵梁结构12,拆除第三道临时钢管支撑9,搭设模板支架体系,采用“预制+现浇”方式将预制桩1与结构内衬侧墙2叠合形成叠合墙,预制柱芯8-(1)与外包现浇层8-(2)叠合形成叠合柱,上述叠合墙、叠合柱与主体中板及中纵梁结构13组合形成负二层框架结构体系,具体叠合工艺为:预制柱芯8-(1)的负二层高度范围凿毛清洗和钢筋接驳连接,与柱芯外包现浇层8-(2)进行浇筑叠合,负二层内衬结构侧墙2与预制桩接合面凿毛清洗,墙受力钢筋通过钢筋连接器3与预制桩1连接并浇筑叠合,上述叠合墙、叠合柱与主体中板及中纵梁结构13采用现浇方式完成,有利于提高构件节点抗震性能;Construction step 4: Lay the cushion and waterproof layer, pour the main floor and the bottom longitudinal beam structure 12, remove the third temporary
施工步骤五:拆除第二道临时钢管支撑9,车站负一层两侧结构内衬侧墙2与预制桩1通过钢筋连接器3连接后进行浇筑形成叠合墙,墙体上端设置侧墙牛腿;Construction step 5: Remove the second temporary
负一层预制柱芯8-(1)与外包现浇层8-(2)浇筑叠合形成叠合柱,叠合工艺同步骤四;The prefabricated column core 8-(1) on the negative floor is poured and superimposed with the outsourcing cast-in-place layer 8-(2) to form a superimposed column, and the superimposed process is the same as
施工步骤六:顶板纵向连续铺设预制薄板单元5-(1),两端分别搭设在结构内衬墙2上端牛腿及先浇顶纵梁7-(1)边牛腿,上述牛腿作为预制薄板单元5-(1)的支撑铰节点,预制薄板单元 5-(1)作为上部后浇层的底部模板并兼做永久顶板的一部分,接下来铺设绑扎后浇结构顶板6、后浇顶纵梁7-(2)的受力钢筋,并做好预制结构与后浇结构接触粗糙面的凿毛处理后,分层连续浇筑混凝土,形成由预制薄板单元 5-(1)、先浇顶纵梁 7-(1)、后浇顶纵梁 7-(2)、后浇结构顶板6等构件组合而成的“预制+现浇”叠合梁板永久结构体系,共同承担外部全部荷载;Construction step 6: The prefabricated thin plate unit 5-(1) is laid longitudinally and continuously on the roof, and the two ends are respectively erected on the upper corbel of the
施工步骤七:顶板上部覆土回填,恢复路面交通。Construction Step 7: Backfill the top of the roof with soil to restore road traffic.
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.
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CN106869172B (en) * | 2017-04-01 | 2019-01-04 | 中交第二航务工程局有限公司 | In-situ deposited prefabricated split-mounting type subway underground station construction method |
CN107975064A (en) * | 2017-11-27 | 2018-05-01 | 上海市基础工程集团有限公司 | Integral prefabricated fabricated construction technique for underground engineering |
CN111197315A (en) * | 2020-02-24 | 2020-05-26 | 中铁第六勘察设计院集团有限公司 | Composite column structure for subway station and construction method |
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2022
- 2022-05-11 CN CN202210546591.7A patent/CN114809015B/en active Active
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Inventor after: Wang Xing Inventor after: Chen Gongxiang Inventor after: Fei Manli Inventor after: Lu Linhai Inventor after: Liu Jiahai Inventor after: He Weiguo Inventor after: Song Chaoye Inventor after: Fan Guogang Inventor after: Guo Ye Inventor after: Li Maojia Inventor before: Wang Xing Inventor before: Fei Manli Inventor before: He Weiguo Inventor before: Song Chaoye Inventor before: Fan Guogang Inventor before: Guo Ye Inventor before: Li Maojia Inventor before: Chen Gongxiang |
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