拉森钢板桩设计计算书
钢板桩支护计算书
钢板桩支护计算书采用12m的拉森钢板桩进行基坑围护，围护示意图如下：沿钢板桩深度方向设立二道斜角400×400H型钢支撑，相应位置见上图。
根据地质勘探报告，得各土层物理参数如下：①层平均层厚为2.4m，容重取20kN/m3，粘结力c=0，主动侧压力系数取0.2；②层平均层厚为 3.0m，容重取20.3kN/m3，粘结力c=0，内摩擦角为33.33°，主动土压力系数Ka=tan2(45-33.33/2)=0.29，被动土压力系数Kp= tan2(45+33.33/2)=3.44；③层平均层厚为2.6m，容重取20.2kN/m3，粘结力c=51.3，内摩擦角为9.9°，主动土压力系数Ka=tan2(45-9.9/2)=0.71，被动土压力系数Kp= tan2(45+9.9/2)=1.42；④层平均层厚为7.4m，容重取19.7kN/m3，粘结力c=33.2，内摩擦角为11.4°，主动土压力系数Ka=tan2(45-11.4/2)=0.67，被动土压力系数Kp= tan2(45+11.4/2)=1.49；⑤层平均层厚为8.15m，容重取20.1kN/m3，粘结力c=68，内摩擦角为13.7°，主动土压力系数Ka=tan2(45-13.7/2)=0.62，被动土压力系数Kp= tan2(45+13.7/2)=1.62；一、钢板桩最小入土深度（根据C点支撑反力为零计算出最小入土深度）基坑开挖深度6m，取钢板桩单位长度为计算单元。
钢板桩为拉森III型钢板桩，围囹、支撑、锚桩均采用400×400的H型钢，相应的截面性能参数见计算书后附件。
按上图的支护方式，计算图式可简化为三点支撑的连续梁，结构简图及荷载分布图如下(采用结构力学求解器进行求解)：结构弯矩图如下：剪力图如下：在此支撑模式下，坑底最小入土深度为1.2m。
此时支撑点C的反力为零。
出于安全考虑，钢板桩入土深度实际施工时按3m施工。
6m拉森钢板桩计算书
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水平力
作用类型
水平力值
作用深度
是否参与
是否参与
序号
(kN)
(m)
倾覆稳定
整体稳定
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[设计结果]
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[结构计算]
1#、3#段沟槽拉森钢板桩支护计算书
说明：由于1#、3#段沟槽均采用悬壁支护，故对最大开挖深度为4m、支护土层较差的3#段沟槽进行支护稳定性验算即可。
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[支护方案]
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规范与规程
《建筑基坑支护技术规程》JGJ 120-2012
内力计算方法
增量法
支护结构安全等级
二级
支护结构重要性系数γ0
1.00
基坑深度H(m)
4.000
嵌固深度(m)
[截面计算]
拉森钢板桩计算
钢板桩设计地质状况本工程项目座落在张家港市北部长江南岸张家港化工保税区内。
厂区位于长江冲积平原的河漫滩地，地形平坦。
原自然地坪标高较底，场地平均高程，现已采用吹砂回填，将厂区地坪标高提高根据地质报告，本工程土质上层为吹填砂，以下分别为粉质粘土夹粉土；粉细砂夹粉土，土的抗压、抗剪强度均较低，且难以采取有效的降排水措施。
目前厂区内地下水位较高，土质松软，地质情况较为复杂。
该区地质结构断面如下图所示：电梯井形状本工程结构形式如下。
目前基坑结构长米，宽米，基坑底标高，基坑深度米。
池壁每一侧考虑米宽的工作面，则支护结构的尺寸为长米，宽米。
2 支撑式钢板桩挡土墙的构造本工程采用内撑钢板桩挡土墙结构。
其主要由钢板桩、支撑二部分组成，钢板桩起承受水平土压力防止土体沿滑动面滑动以及阻隔地下水的作用。
它的稳定主要靠两道钢支撑使钢板桩保持垂直、稳定，并确保两侧土体不向基坑内发生位移，钢板桩应插入土体一定深度，防止土体滑动和基坑向上隆起。
支撑式钢板桩支挡结构简单且便于施工，整个支挡系统均在基坑开挖过程中完成，作业（包括支撑和挖土）十分安全，施工质量容易保证，且较经济。
3 钢板桩设计其钢板桩和内钢支撑布置示意图如下：钢板桩钢支撑立体布置图安全围栏上下通道2000 12m 钢板桩200045002000钢板桩围檩及内支撑平面布置图工字钢400× 400 围檩φ 377 ×10 钢管支撑φ630 × 12 钢管支撑45004500本工程钢板桩采用Ⅳ型拉森钢板桩，长度为12m,宽度400mm。
（即每块1m）。
钢板桩水平围檩采用40 号工字钢，内支撑采用Φ630×12 的直撑钢管和Φ 377×10 的斜撑钢管。
为此，共需12 米长的钢板桩数量：N =（A+B）× 2÷ =（+）× 2÷ = 160根。
本方案基坑开挖深度最深按计算，设二道水平支撑。
水中墩钢板桩围堰计算书
水中墩钢板桩围堰计算书一、 计算总说明1．计算水位取+2.5m。
2．钢板桩采用IV型拉森桩，长21m，重量75kg/m，截面模量W=2037cm3,允许应力为[σ]=180Mpa。
3．土质按图纸提供参数。
4．钢板桩中支撑不按等反力和等跨弯矩布置，依施工需要安排，即板桩按跨度不等的连续梁计算。
二、 入土深度验算本地质土层为两层较厚的亚粘土中夹了一层粉砂层，且粉砂层较薄，所以本围堰有较好的地质土层。
为安全起见，现按粉砂、细砂土质中不出现涌砂的情况来验算。
不出现涌砂情况时，如图所示基坑内抽水后水头差为h’，由此引起的水渗流，其最短流程为紧靠板桩的h1+h2，故在此流程中，水对土粒渗透的力，其方向应是垂直向上。
现近似地以此流程的渗流来检算坑底的涌砂问题，要求垂直向上的渗透力不超过土在水中的密度，故安全条件如公式所示：K s iρw=K s h’/(h1+h2)×ρw≤ρb式中：K s—安全系数；i—水力梯度；ρb—分别为水的密度及土在水中的密度，g/cm3ρw、ρb=(G-1)(1-n)其中G为土粒的比重;n为土的孔隙率以小数计。
土层按第④层土均质土层计算，入土深等数值见图1.地质剖面图，其中h’=11.7m、h1=10.7m、h2=7.3m、G=2.725g/cm3、安全系数取1.4:K s iρw=1.4×11.7/(7.3+10.7)=0.91ρb=(G-1)(1-n)=(2.725-1)(1-0.78/(1+0.78))=0.970.91<0.97满足要求。
三、 土压力计算按照静止土压力计算钢板桩后土压力：p0=K0rzK0—静止土压力系数，K0=1-sinθ’A点：p0a=r w×h=10×8.3=83kpaB点：p0a=K0(q+r’2h2)=0.778(83+9.4×5.3)=103 kpaC点：p0a= K0(q+r’2h2+r’3h3)=0.669(83+9.4×5.3+8.8×2.2)=102kpaD点：p0a=K0(q+r’2h2+r’3h3+r’4h4)=0.748(83+9.4×5.3+8.8×2.2+9.6×3.2)=137kp 四、 钢板桩计算钢板桩顶标高+4.5m，入土深度7.3m，设置四道支撑，各支撑的中心标高分别为+2.0m、-1.0m、-3.4m、-5.5m。
钢板桩计算书(2010.5.20)
目录1设计资料 (1)2钢板桩入土深度计算 (1)2.1内力计算 (1)2.2入土深度计算 (2)3钢板桩稳定性检算 (3)3.1管涌检算 (3)3.2基坑底部隆起验算 (4)4围囹检算 (5)4.1工况分析与计算 (5)4.1.1工况一 (5)4.1.2工况二 (6)4.1.3工况三 (7)4.1.4工况四 (8)4.1.5工况五 (9)4.1.6工况七 (11)4.1.7工况八 (12)4.1.8工况九 (13)4.2围囹计算 (14)4.2.1顶层围囹 (15)4.2.2第一层围囹 (16)4.2.3第二层围囹 (17)nd impr ove idle l and of utilizati on, real a chieve d envir onment im proved a nd productivity development mutual prom oting total wi n. Five, firmly implement, promoti ng work ahead, to create hig hlights. T hird depl oyment, impl ementation of seven, the n it is imperative to stre ngthen re sponsibility a nd impr ove the mecha nisms and impleme ntation. All localities a nd departments m ust be convi nce d that goal s, goi ng all out, mustering spirit, w ork together t o ensure that thi s year's obje ctives carry out tasks, at t he forefront. First, w e must strengt hen t he leader shi p to impleme nt. Departments at all level s shoul d always w ork and rural "five water treatment", "three to split" in an im portant position, and carry the mai n responsibi lity, main lea der personally, leaders arre sted and layers of responsi bility rank transmissi on pre ssur e establi she d hierarchica l accountabil ity, and w ork together to promote the work of the mecha nism, a concerte d effort pay attention to im plementation. County nongba n, flood, thre e to one down t o further play a lea ding catch t otal, integrated a ndcoor dinate d role of all kinds is "long", "Sheriff" "Inspector" to effectively fulfill t heir responsibilities, formed t he alig nment on the f ire line and management a lively situati on. Se cond, w e must stre ngthen t he test impleme ntation of the Governor. Role play the Governor got the baton, for agricultural and rural focus and "five water treatment", "three to split" work, refine im prove assessm nt methods a nd eval uation system, accurate a ssessment. Combi ned wit h "dare pla y, tree benchmark" style buil ding five major operations, carry on and gain firstha nd experience of supervi sion, in particular, to strengthe n the focus on t he "long" signs "go left", "names" such a s supervisi on, urged all l evels longer on duty in pl ace. Through the supervisory assessme nt, to pr omote ha bits, stimulating power. Thir d, we must stre ngthe n impleme ntation style. De partments at all level s to work i n rural areas and "five water treatment", "three to split" as traini ng ca dres for major platforms, compete agai nst large examination room, i nspecti on cadres work performance of the ring, water control a nd t heJapanese pulle d a work out, traini ng, di scovery and sele ction of cadre s. Than good catch up, first to excell ence-oriente d. Party members and cadres at all lev els must a dhere t o the rural, w ater control and the Japanese pulled a grass-roots, "put dow n the shelf, leane d" pragmatic style, t he spirit of play, be come a benchmark model. Four, w e must strengt hen propaga nda im plementation. Compre hensive utili zation of micro-credit, micro-bl ogging, new media, mining, summarizi ng, good publ icity work i n the countrysi de and "five water treatment", "three to split" advanced models, poi nt to gather positive energy for the community to see t he result s of our w ork in time, i ncrease public a warene ss, parti cipati on rates, sati sfaction and support. Play gongqi ngfu, a mass organizati on and grass-roots such a s schools, communityThe role of4.2.4第三层围囹 (17)4.2.5第四层围囹 (18)5对撑和斜撑检算 (19)nd impr ove idle l and of utilizati on, real a chieve d envir onment im proved a nd productivity development mutual promoti ng total wi n. Five, firmly implement, promoting w ork ahe ad, to create hig hlights. T hird depl oyment, impleme ntation of seven, then it i s imperative to strengt hen re sponsibility a nd impr ove the mechanisms and impleme ntation. All localities a nd departments m ust be convi nce d that goal s, goi ng all out, mustering spirit, w ork together t o ensure that thi s year's obje ctives carry out tasks, at the forefront. First, we m ust strengthen the leader shi p to implement. Departments at all level s shoul d always w ork and rural "five water treatment", "thr ee to split" in a n important position, and carry the mai n responsibi lity, main lea der personally, leaders arre sted and layers of responsi bility rank transmissi on pre ssure e stabli she d hierarchical a ccountabilit y, and work together to pr omote the w ork of the mechani sm, a concerted effort pay attention to impleme ntation. County nong ban, flood, three to one dow n to further play a leadi ng catch total, integrate d andcoor dinate d role of all ki nds i s "long", "Sheriff" "Inspe ctor" to effectively fulfill their responsi bilities, formed the alig nment on the fire line a nd ma nagement a lively sit uation. Second, we must strengthe n the test impl ementation of the Governor. Role play the Governor got the baton, for agri cult ural and rural focus and "five water treatment", "three to split" work, refine impr ove asse ssment methods and evaluati on system, a ccurate assessment. Combi ned wit h "dare pla y, tree benchmark" style buildi ng five major operations, carry on a nd gain firstha nd ex perie nce of supe rvision, in particul ar, to strengt hen the focus on the "long" signs "go left", "names" such as supervisi on, urged all level s longer on duty in place. Through the supervi sory assessme nt, to pr omote ha bits, stimulati ng power. T hird, w e must strengt hen im plementation style. Department s at all levels to w ork in rural areas and "five water treatment", "three to split" as traini ng ca dres for major platforms, com pete against large examination r oom, inspe ction ca dres work performance of the ri ng, water control a nd t he Japanese pulle d a work out, traini ng, di scovery and sele ction of cadre s. Than good catch up, first to excell ence-oriente d. Party members and cadres at all lev els must a dhere t o the rural, w ater control and the Japanese pulled a grass-roots, "put dow n the shelf, leane d" pragmatic style, t he spirit of play, be come a benchmark model. Four, w e must strengt hen propaga nda im plementation. Compre hensive utili zation of micro-credit, micro-bl ogging, new media, mining, summarizi ng, good publ icity work i n the countrysi de and "five water treatment", "three to split" advanced models, poi nt to gather positive energy for the community to see t he result s of our w ork in time, i ncrease public a warene ss, parti cipati on rates, sati sfaction and support. Play gongqi ngfu, a mass organizati on and grass-roots such a s schools, communityThe role of2ocusing on ways and mea ns of impr oving a nd upgra ding w ork, furt her dev elopment of "three t o split". (A) fully grasp "no unaut hori sed" create d. T he tow nship "no una uthor ised" created t he existing buildi ng "one household, one document" survey and file storage work must be unconditi onal and full coverage. Mai n corridor leadi ng to t he town (roa d, river) village, t he Central built-up area of the tow n on both sides must be to create a "no unaut hori sed vil lage". Accordi ng to "five hundre d village s" cr eated and shanty tow ns, v illages, old house s, reconstructi on of ol d pla nt, expand create, upgradi ng creates files, t he real "no unaut hori sed vill age" created i nto t he benefit of the pe opl e of very good thing. (B) to stri ctly manage count a s unaut horise d contr ols. Promoti ng the "new" control work to move the ce nter of gravity, ma nagement mea sures t o the front, a nd ear nestly pipe s effectively. A strict new una uthorise d netw ork responsi bility. Sect ors such as l and, housing a nd basi c stations (stations) and the Townshi p of gri daccounta bility mechani sms must be strictly in a ccorda nce with the new reg ulatory requirements, effective implementation of the area of responsibility of the new i nspecti ons, suppre ssion, demolition work to ensure that the new "zer o tolerance". Second, publi c se curit y, water, el ectricit y, water, ocea ns and fisheries, tourism collaboration, market supervisi on departments shoul d strictly enfor ce the illegal constr ucti on of di sposal of relevant provi sions of the reg ulations, effective fulfilment of responsi bilities, particularly in el ectri city and water supply, and other units may not be new illegal buil dings t o supply water a nd ele ctricity supply. While more reg ulation to preve nt personal privacy violati ons. Illi cit trading i n illegal constr ucti on i n the Mi nistry of publi c se curity se ctor to stri ctly from the bl ow. Three i s to create a dditi onal offence reporting system of i nce ntives. According to buil ding law a nd covers a n area of nat ure, to re port timely degree divide d report grade, effective after the removal of certain i nce ntives. (C) integrated impleme ntation ", buil ding demoliti on, modification,use" combi nation. Demoliti on is the means and purpose built is. To adhere to the building demoli she d, combination of constr ucti on and demolition waste, demoli she d with combi ned efforts to improve the scientific level of three to split; second, we must pay attention to "three to split" an d "five hundred" and "five water treatment", "three of the four sides", the shackDistri ct transformation, and danger ous ol d room transformation and "two road sides", serie work organic combine d up, active do River, and along dem olition work, and manpower adva nce village in the, and old residential dem olition work, to improved masses housi ng conditi ons and live environme nt; three to put "three modified a split" as traditional low and small, and bulk industry structure transformation upgrade of important initiatives to caught, speed up adva nce industry Park, effective optimization park environment 中铁四局集团有限公司合肥铁路枢纽南环线工程项目经理部 南淝河特大桥承台钢板桩nd impr ove idle l and of utilizati on, real a chieve d envir onment im proved a nd productivity development mutual promoti ng total wi n. Five, firmly implement, promoting w ork ahe ad, to create hig hlights. T hird depl oyment, impleme ntatio n of seven, then it i s imperative to strengt hen re sponsibility a nd impr ove the mechanisms and impleme ntation. All localities a nd departments m ust be convi nce d that goal s, goi ng all out, mustering spirit, w ork together t o ensure that thi s year's obje ctives carry out tasks, at the forefront. First, we m ust strengthen the leader shi p to implement. Departments at all level s shoul d always w ork and rural "five water treatment", "three to split" in a n important position, and carry the mai n responsibi lity, main lea der personally, leaders arre sted and layers of responsi bility rank transmissi on pre ssure e stabli she d hierarchical a ccountabilit y, and work together to pr omote the w ork of the mechani sm, a concerted effort pay attention to impleme ntation. County nong ban, flood, three to one dow n to further play a leadi ng catch total, integrate d andcoor dinate d role of all ki nds i s "long", "Sheriff" "Inspe ctor" to effectively fulfill their responsi bilities, formed the alig nment on the fire line a nd ma nagement a lively sit uation. Second, we must strengthe n the test impl ementation of the Governor. Role play the Governor got the baton, for ag cult ural and rural focus and "five water treatment", "three to split" work, refine impr ove asse ssment methods and evaluati on system, a ccurate assessment. Combi ned wit h "dare pla y, tree benchmark" style buildi ng five major operations, carry on a nd gain firstha nd ex perie nce of supe rvision, in particul ar, to strengt hen the focus on the "long" signs "go left", "names" such as supervisi on, urged all level s longer on duty in place. Through the supervi sory assessme nt, to pr omote ha bits, stimulati ng power. T hird, w e must strengt hen im plementation style. Department s at all levels to w ork in rural areas and "five water treatment", "three to split" as traini ng ca dres for major platforms, com pete against large examination r oom, inspe ction ca dres work performance of the ri ng, water control a nd t heJapanese pulle d a work out, traini ng, di scovery and sele ction of cadre s. Than good catch up, first to excell ence-oriente d. Party members and cadres at all lev els must a dhere t o the rural, w ater control and the Japanese pulled a grass-roots, "put dow n the shelf, leane d" pragmatic style, t he spirit of play, be come a benchmark model. Four, w e must strengt hen propaga nda im plementation. Compre hensive utili zation of micro -credit , micro-bl ogging, new media , mining , summarizi ng, good publ icity work i n the countrysi de and "five water treatment", "three to split" advanced models, poi nt to gather positive energy for the community to see t he result s of our w ork in time, i ncrease public a warene ss, parti cipati on rates, sati sfaction and support. Play gongqi ngfu, a mass organizati on and grass -roots such a s schools, communityThe role of 1 南淝河特大桥连续梁主墩承台钢板桩围堰施工计算书1设计资料(1)桩顶高程H1：8.0m ，汛期施工水位：7.0m 。
钢板桩计算书(优质特享)
目录1设计资料 (1)2钢板桩入土深度计算 (1)2.1内力计算 (1)2.2入土深度计算 (2)3钢板桩稳定性检算 (3)3.1管涌检算 (3)3.2基坑底部隆起验算 (4)4围囹检算 (5)4.1工况分析与计算 (5)4.1.1工况一 (5)4.1.2工况二 (6)4.1.3工况三 (7)4.1.4工况四 (8)4.1.5工况五 (9)4.1.6工况七 (11)4.1.7工况八 (12)4.1.8工况九 (13)4.2围囹计算 (14)4.2.1顶层围囹 (15)4.2.2第一层围囹 (16)4.2.3第二层围囹 (17)4.2.4第三层围囹 (17)4.2.5第四层围囹 (18)5对撑和斜撑检算 (19)南淝河特大桥连续梁主墩承台 钢板桩围堰施工计算书1设计资料(1)桩顶高程H1：8.0m ，汛期施工水位：7.0m 。
(2)地面标高H 0：8m ；基坑底标高H3：-1.54m ；开挖深度H ：9.54m 。
(3)封底混凝土采用C30混凝土，封底厚度为1m 。
(3)坑内、外土的天然容重加权平均值1r 、2r 均为：18.9KN/m 3；内摩擦角加权平均值 8.18=ϕ；粘聚力C ：24KPa 。
(4)地面超载q ：按70吨考虑，换算后为10KN/m 2。
(5)钢板桩采用国产拉森钢板桩，选用鞍IV 型（新）（见《施工计算手册》中国建筑工业出版社P290页）钢板桩参数 A=98.70cm 2，W=2043cm 3，[]δ=200Mpa ，桩长18m 。
2钢板桩入土深度计算 2.1内力计算(1)作用在钢板桩上的土压力强度及压力分部见图2.1根据《简明施工计算手册》中国建筑工业出版社，P284页(5-89、5-90）公式得：51.028.1845tg K o o2a =-=）（95.128.1845tg K oo2pi =+=）（钢板桩均布荷载换算土高度0h ：m r q h 53.09.18/10/0===(2)支撑层数及间距按等弯矩布置确定各层支撑的间距,则拉森Ⅳ型钢板桩顶部悬臂端的最大允许跨度，根据《简明施工计算手册》中国建筑工业出版社，P284页(5-96）公式得：[]35351.09.182043102006r W 6h ⨯⨯⨯⨯==a K δ=2940mm=2.9mh1=1.11h=1.11*2.9=3.2m h2=0.88h=0.88*2.9=2.6m h3=0.77h=0.77*2.9=2.2m根据施工需要调整支撑布置h1=2.1m ，h2=2.1m ，h3=1.6层数为3层。
拉森钢板桩计算范文
拉森钢板桩计算范文首先，拉森钢板桩的计算主要包括以下几个方面：1.桩长计算2.桩身截面计算3.钢板的选择和计算4.连接机构的计算首先，桩长的计算需要根据具体工程的要求进行。
通常根据挡土高度、土壤条件等因素来确定。
桩长的计算可以采用经验公式或者数值计算方法。
经验公式可以根据挡土高度进行估算，但对于复杂的地质条件和土质情况，还需要进行数值计算。
在进行桩身截面计算时，需要根据工程要求的桩身横截面形状和尺寸来确定。
常见的桩身横截面形状有直线形、梯形形和锯齿形等。
在确定桩身横截面形状后，需要进行相关计算，包括抗弯强度、剪切强度等计算。
这些计算可以通过材料力学公式、截面力学平衡等原理进行。
关于钢板的选择和计算，需要根据桩身截面形状和尺寸来确定。
钢板需要具备足够的强度和刚度，才能够满足工程要求。
在钢板计算中，需要考虑其破坏形式、承载力和刚度等因素。
钢板的计算可以根据经验公式或者有限元方法进行。
最后，连接机构的计算是确保拉森钢板桩系统能够正常工作和承受荷载的重要一环。
连接机构包括桩身之间的连接和桩身与基础之间的连接。
在连接机构的计算中，需要根据桩身截面形状和尺寸，结合工程要求，考虑连接的刚度和强度等因素。
连接机构的计算可以通过弹性理论、塑性理论等进行。
综上所述，拉森钢板桩的计算是一个综合性的过程，需要考虑桩长、桩身截面、钢板选择和计算以及连接机构等方面。
在进行计算时，需要根据具体工程要求的土壤条件、挡土高度等进行合理的选择和计算。
通过合理的计算和设计，可以确保拉森钢板桩系统能够满足工程要求，并具备足够的抗荷能力和稳定性。
拉森扣板桩计算书(同样适合工字钢)
拉森钢板桩（扣板）受力验算由于没有地质资料图，根据现场实际开挖获取的地质资料提取验算参数。
因本工程钢板桩施工区地质情况复杂，且无明显变化界限，为确保安全，选有代表性的地质断面分别计算荷载，取最不利荷载对拉森扣板桩支护进行验算，代表性地质断面情况如下表（按11.5m深度统计），场地狭窄，大部分是填筑土，以表1的地质情况验算。
1、土层参数内摩擦角φ取值见建筑施工计算手册第77页表2-1表1 地质断面情况表地层名称层厚（m）土的容重ｒ（KN/m3）内摩擦角φ（°）凝聚力c（KPa）备注人工回填土 1.919.1 23 参考同类土质试验成果淤泥质粉质粘土 1.616.9 4.4 5.5 参考同类土质试验成果粉质粘土820.1 22.2 17.3 参考同类土质试验成果2、拉森钢板桩参数表2 拉森钢板桩参数表钢板桩型号每延米截面积cm2每延米惯矩Ix（cm4）每延米抵抗矩Wx（cm3）容许弯曲应力［σw］（MPa）容许剪应力［τ］（MPa）备注拉森Ⅳ236 36551 2037 210 1203、汽车荷载换算成等代均布荷载的土层厚：装土车安排1台在坑边，装土后总重＝自重20+土重20=40t装土时汽车荷载分布示意图（单位：m）荷载换算成的土层厚度：H=ΣP/(BLr)=40×10/(3.55×8.05×18.4)=0.77m4、拉森钢板桩最大悬臂长度的计算：4.1 土体参数计算根据现场调查，安设钢板桩的地段，最小开挖深度h＝3m以上，取3m范围的土层计算土体参数加权平均值。
土平均容重ｒ＝（18.4×1.9+16.9×1.1）/3＝17.85 KN/m3土平均摩擦角φ＝（23×1.9+4.4×1.6）/3＝16.91主动土压力系数Ka＝tga2（45°－φ/2）=0.553m深度处的最大主动土压力荷载：主动土压力荷载q＝ｒ×(h+0.77)×Ka＝17.85×3.77×0.55=37.02 KN/m钢板桩悬臂部分受力图（单位：m）4.2拉森钢板桩最大悬臂长度计算拉森IV型钢板桩（用于开挖深度3～6.6m的管道）M≦Wx×［σw］max1/6×(h+0.77)×(h+0.77)×17.85×(h+0.77)×0.55×10000）≦2037×210由上式得出h≦2.2m因拉森IV型钢板桩用于开挖的深度均大于2.2m，大于其最大悬臂长度，故都需加支撑。
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拉森钢板桩设计计算书
1钢板桩的设置位置要符合设计要求,便于基础施工,即在基础最突出的边缘外留有支模、拆模的余地;
2基坑护壁钢板桩的平面布置形状应尽量平直整齐,避免不规则的转角,以便标准钢板桩的利用和支撑设置;各周边尺寸尽量符合板桩模数;
3整个基础施工期间,在挖土、吊运、扎钢筋、浇筑混凝土等施工作业中,严禁碰撞支撑,禁止任意拆除支撑,禁止在支撑上任意切割、电焊,也不应在支撑上搁置重物;
差的钢板桩应尽量不用;
---------------------------------------------------------------------- 弹性法土压力模型: 经典法土压力模型:
----------------------------------------------------------------------
工况信息
----------------------------------------------------------------------
---------------------------------------------------------------------- 设计结果
---------------------------------------------------------------------- ---------------------------------------------------------------------- 结构计算
---------------------------------------------------------------------- 各工况：
内力包络图：
2、拉森钢板桩型号的选择与验算
=·m;
由上节弯矩图可见钢板桩桩身最大弯矩标准值为M
max
选取SP-Ⅳ型号的拉森钢板桩,每延米W=2270cm3;由钢结构设计规范3.4.1条知钢板桩的强度设计值为215N/mm2,安全系数取2;由于地下水较丰富,所以采用双层拉森钢板桩,每延米W=4540cm3;考虑两层钢板桩的折减系数为;则桩身最大应力为：
由于<215××=86MPa,所以满足要求
拉森钢板桩技术参数表
3、钢支撑及围檩内力的计算
第一道钢支撑及围檩采用单层形式,第二道钢支撑及围檩均采用双拼形式;对钢支撑进行平面布置,布置时考虑到钢管桩的操作空间;见下图：
钢支撑平面布置图
利用结构力学求解器求解钢支撑及围檩的内力;
计算简图m、kN/m
M图kN·m
V图kN
N图kN
4、水平对撑及水平斜撑的验算
由于计算方法采用的是极限平衡方法,所以要将支撑反力增加85%,故水平对撑承受的最大轴力设计值为：N=××=;
设计时应该考虑支撑自重及在支撑中心作用10kN的竖向偶然荷载偶然荷载可按照突加荷载计算,弯矩放大系数取2；荷载分项系数：钢材自重=,活载=；有效长度系数=;计算长度取l=,选择莱钢生产的Q235国标H型钢400×400×13×21mm,A=,
g=172kg/m,W x =3340cm 3,W y =1120cm 3
,i x = cm,i y = cm,f=205MPa;λy =l/i y =,查表得φ=;
水平对撑按偏心受压构件计算;杆件弯矩除由竖向荷载产生的弯矩外,尚应考虑轴向力对杆件的附加弯矩,附加弯矩可按轴向力乘以初始偏心距确定;偏心距按实际情况确定,且对钢支撑不小于40mm,一般取10%截面深度且不宜小于支撑计算长度的1/1000,此处取40mm;
由以上可知：水平对撑跨中弯矩最大
M y =×+×5××2+×1/8××
=·m
验算弯矩作用平面内的稳定性：
N ——所计算构件段范围内的轴心压力,N=；
'y E N ——参数,kN 6866083.761.1219500
1006.214.3)1.1/(EA 2
522y
2
'y
=⨯⨯⨯⨯==λ E N
；
φy ——弯矩作用平面内的轴心受压构件稳定系数,φy =；
M y ——所计算构件段范围内的最大弯矩,M y = kN ·m ；
γy ——与截面模量相应的截面塑性发展系数,对于H 型截面γy =； W y ——在弯矩作用平面内对较大受压纤维的毛截面模量,W y =1120cm 3；
βmy ——等效弯矩系数,有端弯矩和横向荷载同时作用时,使构件产生同向
考虑到双拼支撑的下道支撑承受的力较大,故考虑20%的放大系数;
由于×= N/mm 2＜205 N/mm 2
,故满足要求
水平斜撑与水平对撑采用同一种截面形式,斜撑的力较小,故不必重复计算 5、型钢围檩的验算
莱钢生产的Q235国标H 型钢400×400×13×21mm,A=,
g=172kg/m,W x =3340cm 3,W y =1120cm 3,i x = cm,i y = cm,f=205MPa;
计算长度取,λx =l/i x =20,查表得φx =；
由内力图可知围檩内力设计值为：
M x =××=·m；N=××=
验算弯矩作用平面内的稳定性：
N ——所计算构件段范围内的轴心压力,N=；
'Ex N ——参数,kN 10132320
1.121950
1006.214.3)1.1/(EA 2
5222
'=⨯⨯⨯⨯==x
Ex
N
λ ； φx ——弯矩作用平面内的轴心受压构件稳定系数,φx =；
M x ——所计算构件段范围内的最大弯矩,M x =·m；
γx ——与截面模量相应的截面塑性发展系数,对于H 型截面γx =； W 1x ——在弯矩作用平面内对较大受压纤维的毛截面模量,W 1x =3340cm 3；
βmx ——等效弯矩系数,有端弯矩和横向荷载同时作用时,使构件产生同向
考虑到双拼支撑的下道支撑承受的力较大,故考虑20%的放大系数;
由于×= N/mm2＜205 N/mm2,满足要求
由于钢板桩紧贴在围檩翼缘上,故可不必对平面外稳定性进行计算;
围檩角部应力明显比中间部位的小,采取构造措施,焊接两道三角形钢板即可,不必重复计算
6、牛腿的验算
牛腿采用莱钢生产的国标300的槽钢,牛腿在围檩下承受两道围檩以及支撑的自重荷载,设置在每个水平支撑与围檩连接节点下方;
一圈围檩及支撑自重为：
q=×2+×2+4×+2×+++10×172×10×2=
牛腿与钢板桩采用角焊缝为6mm的围焊形式,一圈围檩及支撑需要的焊缝长度为：l=×1000/×6×160=550mm
所以牛腿的设置满足要求。