CN113585237B - Ground connecting wall joint and construction method of ground connecting wall - Google Patents

Ground connecting wall joint and construction method of ground connecting wall Download PDF

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CN113585237B
CN113585237B CN202110932932.XA CN202110932932A CN113585237B CN 113585237 B CN113585237 B CN 113585237B CN 202110932932 A CN202110932932 A CN 202110932932A CN 113585237 B CN113585237 B CN 113585237B
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wall
plate
perforated
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connecting wall
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CN113585237A (en
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董子龙
杨旭东
周凌宁
赵韶晖
周轶
向栩
文远
付鹤林
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Central South University
China Railway Tunnel Group Co Ltd CRTG
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China Railway Tunnel Group Co Ltd CRTG
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18Bulkheads or similar walls made solely of concrete in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/06Placing concrete under water
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/08Sinking workpieces into water or soil inasmuch as not provided for elsewhere

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Abstract

本申请涉及一种地连墙接头及地连墙施工方法,地连墙接头用于连接相邻的两个单元墙段,包括隔离板及穿孔板;所述隔离板用于嵌至相邻的两个单元墙段之间,所述穿孔板固定连接隔离板,且所述穿孔板间隔设有贯穿孔,所述穿孔板用于嵌至单元墙段内,并使得所述贯穿孔位于单元墙段内;所述隔离板的两面均固定连接有至少两个所述穿孔板。穿孔板与两侧单元墙体形成紧密嵌固咬合作用,可承受地下连续墙垂直接缝上的剪力,并使相邻单元墙体形成整体共同承担上部结构的竖向荷载,实现协调单元墙体的不均匀沉降,同时由于两个穿孔板增加了渗漏水所需的流水路径,使得本地连墙接头亦具备较好的止水性能。

Figure 202110932932

The application relates to a ground connecting wall joint and a construction method for the ground connecting wall. The ground connecting wall joint is used to connect two adjacent unit wall sections, and includes an isolation plate and a perforated plate; the isolation plate is used to be embedded in adjacent Between two unit wall sections, the perforated plate is fixedly connected to the isolation plate, and the perforated plate is provided with through holes at intervals, the perforated plate is used to be embedded in the unit wall section, and the through holes are located in the unit wall At least two perforated plates are fixedly connected to both sides of the isolation plate. The perforated plate and the unit walls on both sides form a close and fixed engagement, which can withstand the shear force on the vertical joints of the underground diaphragm wall, and make the adjacent unit walls form a whole to jointly bear the vertical load of the upper structure, so as to realize the coordinated unit wall. The uneven settlement of the body and the two perforated plates increase the water flow path required for the seepage water, so that the local connecting wall joints also have better water-stop performance.

Figure 202110932932

Description

地连墙接头及地连墙施工方法Ground connecting wall joint and ground connecting wall construction method

技术领域technical field

本申请涉及基建工程的领域,尤其是涉及一种地连墙接头及地连墙施工方法。The present application relates to the field of infrastructure engineering, in particular to a ground connecting wall joint and a ground connecting wall construction method.

背景技术Background technique

地下连续墙作为有效的截水、防渗、承重、挡水结构,常用于深基坑、市政管沟、涵洞、护岸、干船坞等工程支护施工。As an effective water interception, anti-seepage, load-bearing and water-retaining structure, the underground diaphragm wall is often used in the support construction of deep foundation pits, municipal trenches, culverts, revetments, dry docks and other projects.

实际施工中,受地质条件、周边环境、基坑深度等因素影响,地下连续墙通常是采用一种或多种接头形式将相邻两个单元墙段相互连接起来从而解决两个单元墙段接缝处渗漏水和连接整体性的问题。In actual construction, affected by factors such as geological conditions, surrounding environment, foundation pit depth, etc., underground diaphragm walls usually use one or more joint forms to connect two adjacent unit wall sections to each other to solve the problem of connecting two unit wall sections. Water leakage at seams and joint integrity issues.

地下连续墙工字钢接头是一种常用的接头形式,但由于工字钢接头的翼板较短,仅包裹在二侧单元墙段的接头上,防渗性能有限。The I-beam joint of the underground diaphragm wall is a common joint form, but due to the short wing plate of the I-beam joint, it is only wrapped on the joint of the unit wall section on the two sides, and the anti-seepage performance is limited.

发明内容SUMMARY OF THE INVENTION

为了提高地下连续墙的防渗性能和整体稳定性,本申请提供一种地连墙接头及地连墙施工方法。In order to improve the anti-seepage performance and overall stability of the underground continuous wall, the present application provides a ground connecting wall joint and a ground connecting wall construction method.

第一方面,本申请提供一种地连墙接头,采用如下的技术方案:In the first aspect, the application provides a ground-to-wall joint, which adopts the following technical solutions:

一种地连墙接头,用于连接相邻的两个单元墙段,包括隔离板及穿孔板;所述隔离板用于嵌至相邻的两个单元墙段之间,所述穿孔板固定连接隔离板,且所述穿孔板间隔设有贯穿孔,所述穿孔板用于嵌至单元墙段内,并使得所述贯穿孔位于单元墙段内;A ground connection wall joint is used to connect two adjacent unit wall sections, including an isolation plate and a perforated plate; the isolation plate is used to be embedded between the two adjacent unit wall sections, and the perforated plate is fixed connecting the isolation plates, and the perforated plates are provided with through holes at intervals, the perforated plates are used to be embedded in the unit wall section, and the through holes are located in the unit wall section;

所述隔离板的两面均固定连接有至少两个所述穿孔板。Both sides of the isolation plate are fixedly connected with at least two perforated plates.

通过采用上述技术方案,穿孔板与两侧单元墙体形成紧密嵌固咬合作用,可承受地下连续墙垂直接缝上的剪力,并使相邻单元墙体形成整体共同承担上部结构的竖向荷载,实现协调单元墙体的不均匀沉降,同时由于两个穿孔板增加了渗漏水所需的流水路径,使得本地连墙接头亦具备较好的止水性能。By adopting the above technical solution, the perforated plate and the unit walls on both sides form a tight occlusion effect, which can withstand the shear force on the vertical joints of the underground diaphragm wall, and make the adjacent unit walls form a whole to jointly undertake the vertical direction of the upper structure. load, and realize the uneven settlement of the coordinated unit wall. At the same time, because the two perforated plates increase the flow path required for the seepage water, the local connecting wall joints also have good water-stop performance.

优选的,所述穿孔板垂直于隔离板。Preferably, the perforated plate is perpendicular to the isolation plate.

优选的,所述穿孔板包括连接板及咬合板;所述连接板固定连接至隔离板;所述咬合板位于连接板远离隔板的一端,且所述贯穿孔设于咬合板上。Preferably, the perforated plate includes a connecting plate and an engaging plate; the connecting plate is fixedly connected to the isolation plate; the engaging plate is located at an end of the connecting plate away from the partition, and the through hole is provided on the engaging plate.

第二方面,本申请提供一种地连墙施工方法,采用如下的技术方案:In the second aspect, the application provides a ground-connecting wall construction method, which adopts the following technical scheme:

一种地连墙施工方法,应用上述的地连墙接头,包括以下步骤:A ground-connecting wall construction method, using the above-mentioned ground-connecting wall joint, includes the following steps:

支护桩、导墙施工,待开挖土方的周侧开挖导槽,导槽侧壁的地面处施工加固桩,在将预制的导墙安装至导槽内并固定,并夯实表层的土壤;For the construction of supporting piles and guide walls, excavate guide grooves on the peripheral side of the earthwork to be excavated, construct reinforcement piles on the ground on the side walls of the guide grooves, install and fix the prefabricated guide walls in the guide grooves, and tamp the surface soil ;

成槽,护壁泥浆注入导槽内,抓斗伸入导槽内进行挖槽,形成单元槽段;A groove is formed, the wall protection mud is injected into the guide groove, and the grab bucket is extended into the guide groove for digging to form a unit groove section;

吊装钢筋笼、接头箱,多根钢筋焊接形成钢筋笼,并将钢筋笼与地连墙接头焊接固定,将钢筋笼吊装至单元槽段内,再将接头箱吊装至单元槽段内;Hoisting steel cages and joint boxes, welding multiple steel bars to form a steel cage, and welding and fixing the steel cage and the ground connecting wall joints, hoisting the steel cages into the unit groove section, and then hoisting the joint box into the unit groove section;

水下混凝土灌注,混凝土浇筑至单元槽段中,待凝固后形成单元墙段;Underwater concrete pouring, the concrete is poured into the unit groove section, and the unit wall section is formed after solidification;

重复上述步骤直至地下连续墙成型。Repeat the above steps until the underground diaphragm wall is formed.

通过采用上述技术方案,成槽时,依靠加固桩加固槽壁处的土体,限制土体的移动,降低槽段塌陷的概率。By adopting the above technical scheme, when forming a groove, the soil body at the groove wall is reinforced by the reinforcement piles, so as to limit the movement of the soil body and reduce the probability of the collapse of the groove section.

优选的,所述加固桩位于导槽朝向待开挖土方的一侧。Preferably, the reinforcing pile is located on the side of the guide groove facing the earthwork to be excavated.

优选的,所述加固桩采用水泥搅拌桩。Preferably, the reinforcing piles are cement mixing piles.

优选的,步骤支护桩、导墙施工中,还包括:注水预搅施工时,在四周开挖排水沟,并设集水井。Preferably, during the construction of the step supporting pile and the guide wall, the method further includes: excavating drainage ditches around and setting up water collecting wells during the water injection and pre-mixing construction.

优选的,所述导墙上口高出地面至少100mm。Preferably, the entrance of the guide wall is at least 100mm higher than the ground.

通过采用上述技术方案,防止了垃圾和雨水的冲入导墙所形成的导槽内污染或稀释泥浆。By adopting the above technical solution, it is prevented that garbage and rainwater are washed into the guide groove formed by the guide wall to contaminate or dilute the mud.

优选的,所述导墙的开口宽度大于抓斗的宽度。Preferably, the width of the opening of the guide wall is greater than the width of the grab.

通过采用上述技术方案,导墙施工时放宽50mm,以便于后续施工过程中,抓斗、钻头、钢筋笼等部件的顺利的进出。By adopting the above technical solution, the guide wall is widened by 50mm during construction, so as to facilitate the smooth entry and exit of the grab bucket, drill bit, steel cage and other components in the subsequent construction process.

综上所述,本申请包括以下至少一种有益技术效果:To sum up, the present application includes at least one of the following beneficial technical effects:

1.穿孔板与两侧单元墙体形成紧密嵌固咬合作用,可承受地下连续墙垂直接缝上的剪力,并使相邻单元墙体形成整体共同承担上部结构的竖向荷载,实现协调单元墙体的不均匀沉降,同时由于两个穿孔板增加了渗漏水所需的流水路径,使得本地连墙接头亦具备较好的止水性能;1. The perforated plate and the unit walls on both sides form a tightly embedded and fixed occlusal effect, which can withstand the shear force on the vertical joints of the underground diaphragm wall, and make the adjacent unit walls form a whole to jointly bear the vertical load of the upper structure to achieve coordination. The uneven settlement of the unit wall, and at the same time, the two perforated plates increase the flow path required for the leakage water, so that the local connecting wall joints also have better water-stop performance;

2.成槽时,依靠加固桩加固槽壁处的土体,限制土体的移动,尤其是针对淤泥质软土与砂土交互地层时,有效降低槽段塌陷的概率。2. When forming a groove, rely on reinforcement piles to reinforce the soil at the wall of the groove to limit the movement of the soil, especially for the interactive stratum of silty soft soil and sandy soil, which effectively reduces the probability of the collapse of the groove section.

附图说明Description of drawings

图1是地连墙接头的结构示意图。Figure 1 is a schematic diagram of the structure of the ground wall joint.

图2是导槽、加固桩的位置示意图。Fig. 2 is a schematic diagram of the position of the guide groove and the reinforcement pile.

附图标记说明:1、隔离板;2、穿孔板;21、连接板;22、咬合板;23、贯穿孔;Explanation of reference numerals: 1, isolation plate; 2, perforated plate; 21, connecting plate; 22, bite plate; 23, through hole;

3、导槽;4、加固桩;5、导墙。3. Guide groove; 4. Reinforcement pile; 5. Guide wall.

具体实施方式Detailed ways

以下结合附图1-2对本申请作进一步详细说明。The present application will be further described in detail below in conjunction with accompanying drawings 1-2.

本申请实施例公开一种地连墙接头,用于连接相邻的两个单元墙段The embodiment of the present application discloses a ground wall joint for connecting two adjacent unit wall sections

参照图1,地连墙接头包括隔离板1及穿孔板2;隔离板1及穿孔板2均采用板。Referring to FIG. 1 , the ground wall joint includes an isolation plate 1 and a perforated plate 2 ; both the isolation plate 1 and the perforated plate 2 are plates.

隔离板1用于嵌至相邻的两个单元墙段之间;隔离板1的两面均固定连接有至少两个穿孔板2。本实施例中,隔离板1的两面均焊接有两个穿孔板2。The isolation board 1 is used to be embedded between two adjacent unit wall segments; at least two perforated boards 2 are fixedly connected to both sides of the isolation board 1 . In this embodiment, two perforated plates 2 are welded on both sides of the isolation plate 1 .

穿孔板2包括一体成型的连接板21及咬合板22。连接板21通过焊接的方式固定连接至隔离板1;咬合板22位于连接板21远离隔板的一端,且咬合板22间隔设有贯穿孔23,本实施例中,贯穿孔23设为方孔。在一个实施例中,穿孔板2垂直于隔离板1;在另一个实施例中,位于隔离板1同一侧的两个穿孔板2中,两个咬合板22的间距大于两个连接板21的间距。The perforated plate 2 includes an integrally formed connecting plate 21 and an engaging plate 22 . The connecting plate 21 is fixedly connected to the isolation plate 1 by welding; the engaging plate 22 is located at one end of the connecting plate 21 away from the partition, and the engaging plate 22 is provided with through holes 23 at intervals. In this embodiment, the through holes 23 are set as square holes . In one embodiment, the perforated plate 2 is perpendicular to the isolation plate 1; in another embodiment, in the two perforated plates 2 located on the same side of the isolation plate 1, the distance between the two engaging plates 22 is greater than the distance between the two connecting plates 21. spacing.

地连墙施工时,混凝土浆料于隔离板1的一侧并包覆穿孔板2,则部分混凝土浆料填充至贯穿孔23内。混凝土浆料凝固后形成单元墙体,实现穿孔板2嵌至单元墙段内,且贯穿孔23位于单元墙段内,进而实现穿孔板2与单元墙体紧密嵌固咬合。During the construction of the ground connection wall, the concrete slurry is placed on one side of the isolation plate 1 and covers the perforated plate 2 , and part of the concrete slurry is filled into the through hole 23 . After the concrete slurry is solidified, a unit wall is formed, so that the perforated plate 2 is embedded in the unit wall section, and the through hole 23 is located in the unit wall section, so that the perforated plate 2 and the unit wall are tightly embedded and fixed.

本申请实施例一种地连墙接头的实施原理为:穿孔板2与两侧单元墙体形成紧密嵌固咬合作用,可承受地下连续墙垂直接缝上的剪力,并使相邻单元墙体形成整体共同承担上部结构的竖向荷载,实现协调单元墙体的不均匀沉降,同时由于两个穿孔板2增加了渗漏水所需的流水路径,使得本地连墙接头亦具备较好的止水性能。The implementation principle of a ground connecting wall joint in the embodiment of the present application is as follows: the perforated plate 2 forms a close-fitting engagement with the unit walls on both sides, which can withstand the shear force on the vertical joints of the underground continuous wall, and make the adjacent unit walls The body is formed as a whole to jointly bear the vertical load of the upper structure, so as to realize the uneven settlement of the coordinated unit wall. At the same time, because the two perforated plates 2 increase the flow path required for the seepage water, the local connecting wall joints also have better performance. Water-stopping properties.

本申请实施例还公开一种地连墙施工方法,包括以下步骤:The embodiment of the present application also discloses a ground connection wall construction method, comprising the following steps:

S10支护桩、导墙5施工,参照图2,待开挖土方的周侧开挖导槽3,导槽3侧壁的地面处施工加固桩4,在将预制的导墙5安装至导槽3内并固定,并夯实表层的土壤。S10 Construction of supporting piles and guide walls 5, referring to Figure 2, excavating guide grooves 3 on the peripheral side of the earthwork to be excavated, and constructing reinforcement piles 4 on the ground on the side walls of the guide grooves 3, and installing the prefabricated guide walls 5 to the guide grooves 5 In the groove 3 and fixed, and tamp the surface soil.

具体的,先将场地整平,再按照待开挖土方位外周外放15cm测出地下墙轴线控制桩,控制桩均采用保护桩。高程引入现场,采用闭合回测法,设置场内水准点,以此控制导墙5及地下连续墙的标高。Specifically, first level the site, and then place 15cm outside the periphery of the soil to be excavated to measure the axis control piles of the underground wall. The control piles are all protected piles. The elevation is introduced into the site, and the closed back-measurement method is used to set the benchmarking point in the site, so as to control the elevation of the guide wall 5 and the underground diaphragm wall.

基于地下墙轴线控制桩的位置,开挖导槽3,然后施工加固桩4。加固桩4采用水泥搅拌桩,并位于导槽3朝向待开挖土方的一侧;必要时,可在导槽3的两侧均施工加固桩4。The position of the pile is controlled based on the axis of the underground wall, the guide channel 3 is excavated, and then the reinforcement pile 4 is constructed. The reinforcement piles 4 are cement mixing piles and are located on the side of the guide groove 3 facing the earthwork to be excavated; if necessary, the reinforcement piles 4 can be constructed on both sides of the guide groove 3 .

同时,水泥搅拌桩技术参数:加固剂采用强度等级42.5级及以上的普通硅酸盐水泥,水灰比控制在0.45-0.55之间,每米水泥用量不低于75kg。同时,在淤泥层、淤泥质细砂层中喷浆搅拌提升速度不得大于0.8m/min,相互搭接的搅拌桩施工间隔时间不应大于24h。At the same time, the technical parameters of the cement mixing pile: the reinforcing agent is ordinary Portland cement with a strength grade of 42.5 and above, the water-cement ratio is controlled between 0.45-0.55, and the amount of cement per meter is not less than 75kg. At the same time, in the silt layer and the silty fine sand layer, the mixing and lifting speed of the shotcrete shall not be greater than 0.8m/min, and the construction interval of the overlapping mixing piles shall not be greater than 24h.

当场地表层较硬需用注水预搅施工时,应在四周开挖排水沟,并设集水井,且排水沟和集水井的位置不得影响搅拌机施工。When the surface of the site is hard and needs to be pre-mixed by water injection, drainage ditches should be excavated around, and water collection wells should be set up, and the positions of the drainage ditches and water collection wells should not affect the construction of the mixer.

并且,预制的导墙5的上口高出地面至少100mm,以防止了垃圾和雨水的冲入导墙5所形成的导槽3内污染或稀释泥浆;导墙5的开口宽度大于抓斗的宽度(导墙5施工时放宽50mm),以便于后续施工过程中,抓斗、钻头、钢筋笼等部件的顺利的进出。In addition, the upper opening of the prefabricated guide wall 5 is at least 100mm higher than the ground to prevent garbage and rainwater from rushing into the guide groove 3 formed by the guide wall 5 to contaminate or dilute the mud; the opening width of the guide wall 5 is larger than that of the grab bucket. The width (the guide wall 5 is relaxed by 50mm during construction), so as to facilitate the smooth entry and exit of the grab bucket, drill bit, steel cage and other components in the subsequent construction process.

S20制备护壁泥浆并施工;泥浆拌制后应贮放24h,待泥浆材料充分水化后方可使用。S20 Prepare mud for wall protection and construct; the mud should be stored for 24 hours after mixing, and can be used after the mud material is fully hydrated.

S30成槽,护壁泥浆注入导槽3内,抓斗伸入导槽3内进行挖槽,形成单元槽段。S30 is formed into a groove, the wall-protecting mud is injected into the guide groove 3, and the grab bucket is extended into the guide groove 3 for digging to form a unit groove section.

具体的,抓斗中心面要与导墙5中心面相吻合。成槽一般采用间隔式开挖,标准槽段应采取三序成槽,先挖两边,再挖中间隔墙,中间隔墙的长度应小于抓斗张开长度,使抓斗能受力均匀套住隔墙挖掘,保证成槽垂直度,避免出现垂直度偏差。Specifically, the center plane of the grab bucket should match the center plane of the guide wall 5 . The grooves are generally excavated at intervals. The standard groove sections should be formed in three sequences. First, dig both sides, and then dig the middle partition wall. The length of the middle partition wall should be less than the opening length of the grab bucket, so that the grab bucket can be evenly covered by force. Excavate the partition wall to ensure the verticality of the groove and avoid verticality deviation.

槽段开挖至距离墙底0.5米时停止开挖,进行接头刷壁,要求最后一次刷壁,其刷壁钢板上没有任何土渣和泥皮。When the groove section is excavated to 0.5 meters from the bottom of the wall, the excavation is stopped, and the joints are brushed. It is required to brush the walls for the last time.

整个施工槽段挖到设计深度后,停置1h,再在设计深度上沿槽段长度方向以每移动1m,下斗抓挖一次的方法,扫清槽底部的沉渣。After the entire construction trough section is dug to the design depth, it is stopped for 1 hour, and then at the design depth along the length of the trough section, the bottom bucket is grabbed and excavated once for every 1m of movement to remove the sediment at the bottom of the trough.

刷壁结束后,进行槽底沉渣清除,清除过程中要严格控制每一斗进尺应控制在15cm左右,且必须采用慢抓慢提的方法,由一端向另一端清除槽底0.5米留土及槽底沉渣、淤泥,保证沉淀淤积物厚度不大于100mm。After the wall is brushed, remove the sediment at the bottom of the tank. During the removal process, it is necessary to strictly control the footage of each bucket to be controlled at about 15cm, and the method of slowly grasping and lifting must be used to remove 0.5 meters of soil left at the bottom of the tank from one end to the other. The sediment and sludge at the bottom of the tank shall ensure that the thickness of the sedimentary sludge is not more than 100mm.

成槽完毕后,槽段检验采用测锤、钢尺、超声波测壁仪、泥浆比重仪检测槽段深度、宽度、平面位置、槽段壁面的垂直度、沉渣厚度及槽底泥浆比重,保证槽段质量是否满足设计、规范要求。After the trough is completed, the trough section inspection uses a hammer, steel ruler, ultrasonic wall measuring instrument, and mud specific gravity meter to detect the depth, width, plane position, verticality of the trough section wall surface, the thickness of the sediment and the specific gravity of the mud at the bottom of the trough. Whether the quality of the segment meets the design and specification requirements.

并且,成槽时,泥浆的供应及处理设备应满足泥浆使用量的要求,泥浆面应高出地下水位,且距地面不大于300mm,直至后续步骤S50中混凝土浇灌完成。In addition, when forming a trough, the mud supply and treatment equipment should meet the requirements of mud usage, the mud surface should be higher than the groundwater level, and the distance from the ground should not be greater than 300mm, until the concrete pouring in the subsequent step S50 is completed.

液压抓斗成槽至岩面时,若不能达到设计终孔标高,则采用冲击桩机进行入岩处理。具体方法为先用圆锤成孔后,再用方锤修边成槽。When the hydraulic grab is grooved to the rock surface, if the designed end hole elevation cannot be reached, the impact pile driver shall be used for rock entry treatment. The specific method is to first use a round hammer to form a hole, and then use a square hammer to trim the edge to form a groove.

S40吊装钢筋笼、接头箱,多根钢筋焊接形成钢筋笼,并将钢筋笼与地连墙接头焊接固定,将钢筋笼吊装至单元槽段内,再将接头箱吊装至单元槽段内。S40 hoisting steel cages and joint boxes, welding multiple steel bars to form a steel cage, and welding and fixing the steel cage and the ground connecting wall joint, hoisting the steel cage into the unit groove section, and then hoisting the joint box into the unit groove section.

具体的,现场布置两套钢筋笼平台,以供钢筋笼在钢筋笼平台上进行制作;同时,使用仪器对钢筋笼平台进行抄平,并随时检查钢筋笼平台的平整度,以保证钢筋笼的精度。Specifically, two sets of reinforcement cage platforms are arranged on site for the reinforcement cages to be fabricated on the reinforcement cage platforms; at the same time, the reinforcement cage platforms are leveled with instruments, and the flatness of the reinforcement cage platforms is checked at any time to ensure that the reinforcement cages are flat. precision.

钢筋笼制作中钢筋接驳均采用焊接,同一截面的接口率应不大于50%,且应错开500mm进行焊接;竖筋合焊必须保证两筋垂直一致,不得扭曲移位。凡未注明的焊缝厚度均为6mm,且要求满焊,以保证钢筋笼的强度。Welding is used for the connection of steel bars in the production of steel cages. The joint ratio of the same section should not be greater than 50%, and should be staggered by 500mm for welding; the joint welding of vertical bars must ensure that the two bars are vertically consistent, and must not be twisted or displaced. Any unspecified weld thickness is 6mm, and full welding is required to ensure the strength of the steel cage.

同时,地连墙接头亦现场焊接而成,将加工好的Q235B隔离板1平铺于地面,按照设计尺寸进行划线定位,确定出穿孔板2的位置,以便后面加工。将穿孔板2固定在事先定好的白线处,然后采用二氧化碳保护焊将其与隔离板1双面满焊,焊缝厚度为6mm,焊接完隔离板1一侧的两片穿孔板2后,反过来将其平稳固定在地面上,之后用焊接前面两片同样的方法完成后面两片穿孔板2的焊接。At the same time, the ground wall joint is also welded on site. The processed Q235B isolation plate 1 is laid on the ground, and the line is marked and positioned according to the design size, and the position of the perforated plate 2 is determined for later processing. Fix the perforated plate 2 at the pre-determined white line, and then use carbon dioxide shielded welding to fully weld it with the isolation plate 1 on both sides. The thickness of the weld is 6mm. After welding the two perforated plates 2 on one side of the isolation plate 1, In turn, fix it on the ground smoothly, and then use the same method to weld the front two pieces to complete the welding of the rear two perforated plates 2.

地连墙接头与钢筋笼的连接主要是将水平筋焊接到隔离板1上,采用E50XX焊条双面焊接,焊缝厚度为6mm,焊接长度满足5d要求。The connection between the ground wall joint and the reinforcement cage is mainly by welding the horizontal bar to the isolation plate 1, using E50XX welding rod for double-sided welding, the thickness of the welding seam is 6mm, and the welding length meets the requirements of 5d.

重力作用下,接头箱垂直下放到地连墙接头处,且接头箱背侧填沙袋,以此来抵挡地连墙浇筑过程中产生的侧向压力。Under the action of gravity, the joint box is vertically lowered to the joint of the ground connecting wall, and the back side of the joint box is filled with sandbags to resist the lateral pressure generated during the pouring of the ground connecting wall.

S50水下混凝土灌注,混凝土浇筑至单元槽段中,待凝固后形成单元墙段。S50 Underwater concrete pouring, the concrete is poured into the unit groove section, and the unit wall section is formed after solidification.

具体的,主要包括清槽、混凝土拌制、设备配置、灌注等过程施工格构式地连墙结构,其断面呈“工”字型。Specifically, it mainly includes the process of cleaning the tank, mixing concrete, equipment configuration, pouring and other processes.

清槽完毕,泥浆经检查合格后,4h内开始灌注混凝土。灌注混凝土时,每个单元槽段应留置一组混凝土抗压试块及一组混凝土抗渗试块。并且,连续墙抗渗等级为P6,地下墙强度为C35,坍落度宜为180-210mm,采用导管式水下混凝土浇筑,其标号比设计标号提高一级,以保证强度和抗渗性能要求。为达到强度要求,其配合比设计至少提高5Mpa。After the cleaning of the tank is completed and the mud is checked and qualified, the concrete will be poured within 4 hours. When pouring concrete, a set of concrete compressive test blocks and a set of concrete impermeability test blocks should be left in each unit groove section. In addition, the impermeability grade of the diaphragm wall is P6, the strength of the underground wall is C35, the slump should be 180-210mm, and the pipe type underwater concrete is poured. . In order to meet the strength requirements, the mixing ratio should be designed to increase by at least 5Mpa.

同时,在灌注作业时,若发现导管漏水、堵塞或混凝土内混入泥浆,应立即停灌并进行处理,做好记录,以保证地连墙的强度要求。At the same time, during the pouring operation, if it is found that the conduit is leaking, blocked, or mud is mixed into the concrete, the irrigation should be stopped immediately and treated, and records should be made to ensure the strength requirements of the ground connection wall.

S60顶拔接头箱;待混凝土凝固后,起拔接头箱。S60 pulls out the joint box; after the concrete is solidified, pull up the joint box.

S70重复上述步骤S20-60直至地下连续墙成型。S70 Repeat the above steps S20-60 until the underground diaphragm wall is formed.

本申请实施例一种地连墙施工方法的实施原理为:成槽时,依靠加固桩4加固槽壁处的土体,限制土体的移动,降低槽段塌陷的概率;地连墙施工完成后,配合地连墙接头,使相邻单元墙体形成整体共同承担上部结构的竖向荷载,实现协调单元墙体的不均匀沉降,同时由于两个穿孔板2增加了渗漏水所需的流水路径,使得本地连墙接头亦具备较好的止水性能。The implementation principle of a ground connection wall construction method in the embodiment of the present application is as follows: when a groove is formed, the soil body at the groove wall is reinforced by means of reinforcement piles 4, the movement of the soil body is restricted, and the probability of collapse of the groove section is reduced; the construction of the ground connection wall is completed. Then, the wall joints are connected together to make the adjacent unit walls form a whole and jointly bear the vertical load of the upper structure, so as to realize the uneven settlement of the coordinated unit walls. The flow path makes the local wall joint also have better water-stop performance.

以上均为本申请的较佳实施例,并非依此限制本申请的保护范围,故:凡依本申请的结构、形状、原理所做的等效变化,均应涵盖于本申请的保护范围之内。The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be covered within the scope of the present application. Inside.

Claims (1)

1.一种地连墙接头,用于连接相邻的两个单元墙段,其特征在于:包括隔离板(1)及穿孔板(2);所述隔离板(1)用于嵌至相邻的两个单元墙段之间,所述穿孔板(2)固定连接隔离板(1),且所述穿孔板(2)间隔设有贯穿孔(23),所述穿孔板(2)用于嵌至单元墙段内,并使得所述贯穿孔(23)位于单元墙段内;1. A ground wall joint for connecting two adjacent unit wall sections, characterized in that: it comprises an isolation plate (1) and a perforated plate (2); the isolation plate (1) is used to be embedded in a phase Between two adjacent unit wall segments, the perforated plate (2) is fixedly connected to the isolation plate (1), and the perforated plate (2) is provided with through holes (23) at intervals, and the perforated plate (2) is used for is embedded in the unit wall section, so that the through hole (23) is located in the unit wall section; 所述隔离板(1)的两面均固定连接有两个所述穿孔板(2);Two perforated plates (2) are fixedly connected to both sides of the isolation plate (1); 所述穿孔板(2)包括连接板(21)及咬合板(22);所述连接板(21)固定连接至隔离板(1);所述咬合板(22)位于连接板(21)远离隔离板(1)的一端,且所述贯穿孔(23)设于咬合板(22)上;The perforated plate (2) includes a connecting plate (21) and an engaging plate (22); the connecting plate (21) is fixedly connected to the isolation plate (1); the engaging plate (22) is located away from the connecting plate (21) one end of the isolation plate (1), and the through hole (23) is provided on the occlusal plate (22); 位于隔离板(1)同一侧的两个穿孔板(2)中,两个咬合板(22)的间距大于两个连接板(21)的间距;In the two perforated plates (2) located on the same side of the isolation plate (1), the distance between the two occlusal plates (22) is greater than the distance between the two connecting plates (21); 隔离板(1)用于供钢筋笼的水平筋焊接连接。The isolation plate (1) is used for welding connection of the horizontal bars of the reinforcement cage.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201187056Y (en) * 2008-04-25 2009-01-28 中船第九设计研究院工程有限公司 Cross plate joint for rigid connection of underground continuous wall
JP2009127318A (en) * 2007-11-26 2009-06-11 Ohbayashi Corp Water stop method for joint joints of underground continuous walls
CN201756706U (en) * 2010-08-19 2011-03-09 中交第三航务工程勘察设计院有限公司 Underground continuous wall rigid joint
CN201981532U (en) * 2011-04-02 2011-09-21 中铁十二局集团建筑安装工程有限公司 Bearing type super deep underground continuous wall adaptor
CN102312445A (en) * 2010-06-29 2012-01-11 中交第三航务工程勘察设计院有限公司 Diaphragm wall and construction method thereof
CN205276287U (en) * 2015-12-24 2016-06-01 上海远方基础工程有限公司 Underground continuous wall's attach fitting and underground continuous wall skeleton

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127318A (en) * 2007-11-26 2009-06-11 Ohbayashi Corp Water stop method for joint joints of underground continuous walls
CN201187056Y (en) * 2008-04-25 2009-01-28 中船第九设计研究院工程有限公司 Cross plate joint for rigid connection of underground continuous wall
CN102312445A (en) * 2010-06-29 2012-01-11 中交第三航务工程勘察设计院有限公司 Diaphragm wall and construction method thereof
CN201756706U (en) * 2010-08-19 2011-03-09 中交第三航务工程勘察设计院有限公司 Underground continuous wall rigid joint
CN201981532U (en) * 2011-04-02 2011-09-21 中铁十二局集团建筑安装工程有限公司 Bearing type super deep underground continuous wall adaptor
CN205276287U (en) * 2015-12-24 2016-06-01 上海远方基础工程有限公司 Underground continuous wall's attach fitting and underground continuous wall skeleton

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