标准规范下载简介
《煤矿立井井筒及硐室设计规范 》（GB50384-2016）（英文版）.pdf6.4Shaftsupportbyshaftdrillingmethod
Pw.k = wH Pn.k = .H.
Pn.kCharacteristicvalueofcounterweightwaterpressure(MPa), wGravity density ofmud(MN/m")is suitable to take O.012MN/m,at the early stage of shafi lining suspension sinking is suitabletotake O.01OMN/m3. —Gravitydensity ofcounterweight watertake O.01oMN/m3. H.Height from mud liquid level to shaft lining bottom(m)
H,Height from balance waterto thebottom of shaft lining(m). 6.4.22The shaft lining thickness of the shaft by the shaft drilling method shall be preliminarily determined by the followingformula: 1The shaft lining of thin walled cylinder(t 预应力钢筋混凝土空心板梁桥后张法预应力砼张拉施工方案YoPr. T.%P IS 2%P f,=fe+Pminfy P = vP. Where,H.rCriticaldepthofshaftlining(m) ICrosssection inertiamomentofshaft(m*). q;Shaft lining weight per meter(N/m). F,External sectional area ofshaft(m*). A—Coefficient values which may be selected according to Table 6.4.28 KcrCoefficientvalues which may be selected according toTable6.4.28 Table 6.4.28Coefficient value of vertical stability of shaft lining =d,十H D=d±2h H,Distance between the protuberance of the cutting edge and the bevel point on the inside edge of the cutting edge L—Distance between the caisson shaft lining and sidewall(m),L = (D, D), 1Shaft lining weight ratio shall be calculated according to the following formula: G S lere,WThecalculatedweightratioofshaftlining(kN/m*)is20kN/mto26kN/m GDead weightofcaisson shaft lining(include buoyancy)(kN) SExternalareaofcaissonshaftlining(m"). 2 In case of checking the calculation according to the sinking conditions,the following requireme ll be inaccordancewith: Table 6.5.13(continued) e6.6.3Calculation simplified diagram of concrete curtai Figure 6.6.3 Calculationsimplifieddiagram fconcretecurtall BEfficient thickness of concrete curtain(m) inArticle6,1.3ofthiscode. Safety coefficient may take 1.7 in case that the concrete curtain is used as temporary support, and the safety coefficient may take3.4 incase that the concrete curtain is used aspermanent support 7.4Cageshaftsumpand cleaning AppendixACalculationforinternalforceand Calculationforinternalforcean ngcapacityofconcreteshaftlining Note:b is equal to shaft lining thickness( m) Bearing capacity of circle cross section of reinforced concrete shaft lining shall be calculated accordingtofollowingformula: 3)Bearing capacity of circle cross section ofreinforced concrete shaft lining shall be accordingtofollowing formula: N capacity of circle cross section of reinforced concrete shaft lining shall be calculated ng to thefollowingformula Where,pSteel ratio ofcircle cross section of shaft lining(%) 3Steel ratio of circle cross section of shaft lining(o)and cross section area of steel reinforcement (A,)shall bedeterminedbyfollowingmethod: 1)In case that o,≤fe,the reinforcing steel bar shall be equipped in accordance with the construction requirements.In case that o,>fe,the steel ratio shall be calculated according to the followingformula 2)In case that eo≥0.225t,it shall be calculated according to thefollowing formula: 2)lncasethateo>0.225t,itshallbecalculatedaccordingtothefollowingformu Table A.l.2Relative limit height at tensile reinforcing steel bars yielding point A.4 Calculationofthestructuralstrengtharoundtheinterfaces betweenthetopsoillayerandthebedrock 4.1Shear force and longitudinal bending moment of the shaft lining at the interface of the tops er and bedrock may be calculated according to the following formulas (calculation diagram 21ureA.4.1) A.4.4The reinforcing steel bars configuration shall be in accordance with the following requirements: 4.4The reinforcing steel bars configuration shall be in accordance with the following requirements 1The length of reinforcing steel bars configuration beneath and above the interface shall not s than one wave length,and the wave length may be calculated according to the following formula: Appendix BCalculation for shaft lining affected 5. Calculationofshaftliningaffectedbythehoist tower settled on thetopsoil layerfoundation 5. Calculationofshaftliningaffectedbythehoist tower settled onthetopsoil layerfoundation following requirements: 1In case that the hoist tower(or headframe)foundation is strip foundation,internal force of circular cross section of the shaft lining (Figure B.1.2)shall be calculated according to the following formula: 2.1In case that hoist tower directly sits on the shaft,the stress on the shaft lining in the influen tion shall be calculated by m method (Figure B.2.1) and be in accordance with the follow uirements: Figure B.2.1 Calculation diagram of m method 1Calculation width of foundation(shaft)should calculated according to thefollowing formula: B,=0.9(D+1) (B.2.1 nere,yTheinfluencedepthofhoisttowerfoundationontheshaft(m). 4The transverse displacement oand rotation angle Yoat the embedded level shall be calcula ording to thethefollowing formulas: nere,o,YoThe transverse displacement and rotation angle at the embedded level of the hoist to foundation. 2)Calculated length Lo(longitudinal buckling length)shall be calculated according to the longitudinal bucklinglength: 水利枢纽施工供电110kv变电站工程施工组织设计Caleulated length Lo(longitudinal buckling length)shall be calculated according to the longitudinal bucklinglength When h<4/a,L0 When h≥4/a.L.=h.+4/d henh≥4/a,L=h,+4/ 建筑泛光及景观照明工程施工方案AppendixCConnection and calculationforflangeplate AppendixCConnectionand calculationforflangepl C.1Connectionforflangeplate