篦冷機施工方案中英文rev1

1、Method Statement of Clinker Cooler ErectionWriter by： Safety Officer： Quality Controller： Technical Leader： Approve by： AVIC Pahang， Malaysia Department October，15th，2013目錄一、篦冷機施工組織構(gòu)成 1.Manpower Structure- 3 -二、篦冷機施工機具一覽表2.tools table- 3 -三、篦冷機安裝周計劃3. Cooler erection plan- 4 -四、篦冷機施工技術(shù)方案Cooler const

2、ruction technique requirement - 6 -五、施工技術(shù)保證措施technique guarantees- 16 -六、 安全與文明施工保證措施safty guarantee. 18一、篦冷機施工組織構(gòu)成 1.Manpower Structure窯頭工段Sub-contractor工段長一人 工程師supervisor one班組長二人 技師team leaders two鉗工五人 技工riveter five 焊工二人 技師welder two起重工一人 技師lifting worker one架子工一人 臨時Worker oneTemporatory質(zhì)安員一人 專

3、職quality controller one輔助工臨時調(diào)配Auxiliary worker 工程技術(shù)部Mechanical Dept項目經(jīng)理部project manager二、篦冷機施工機具一覽表2.tools table序號SN名稱Name型號Spec.單位Unit數(shù)量Num.備注Remarks1汽車吊mobile crane45T臺12汽車吊mobile crane30T臺14滑輪pulley 10T臺35滑輪pulley5T臺26螺旋千斤頂jacking screw10T臺47螺旋千斤頂jacking screw5T臺28手拉葫蘆chain block5T臺89交流電焊機AC weld

4、ing machineBX-30臺310氣割工具gas cutting machine套211水準(zhǔn)儀level instrument臺112經(jīng)緯儀theodolite臺1三、篦冷機安裝周計劃3. Cooler erection plan施工預(yù)計劃：第一周基礎(chǔ)校驗、放線，預(yù)埋標(biāo)板，砂堆制作，設(shè)備出庫檢查清洗說明：土建提供合格基礎(chǔ)，場地平整達到要求，三方會檢簽證。First week：foundation inspection， embedded plates check， equipment package check第二三周下殼體、底梁、灰斗安裝說明：三方會檢簽證。Second to thir

5、d week：downside casing, bottom beams, hoppers erection. Need inspection.第四六周傳動裝置安裝，篦床安裝調(diào)整。說明：三方會檢簽證。Forth to six week: driving device erection, grid bed erection and alignment. Need inspection.第七十周上殼體安裝，破碎機安裝，自動潤滑裝置安裝。說明：三方會檢簽證。Seventh to tenth week: top casing erection, crusher erection, automatic

6、lubricating device erection. Need inspection.第十一周交筑爐。說明：會檢簽證。Eleventh week: handover to ramming work. Need inspection.篦冷機施工程序procedure基礎(chǔ)驗收及劃線施工準(zhǔn)備設(shè)備出庫及檢驗篦冷機下殼體安裝傳動裝置安裝篦板安裝上殼體及潤滑系統(tǒng)安裝破碎機安裝試運轉(zhuǎn)砌 筑1, preparatory work 2, foundation inspection and marking line; equipment package check3, bottom casing erecti

7、on4, driving device erection5, grid plate erection6, top casing and insulating system erection7, crusher erection8, ramming erection9, running test 四、篦冷機施工技術(shù)方案4. Cooler construction technique requirement 1、概述A. summarization往復(fù)推動篦式冷卻機是回轉(zhuǎn)窯的主要配套設(shè)備之一，其作用是降低熟料溫度，改善熟料質(zhì)量，提高熟料的易磨性，提高二次空氣溫度，改變火焰燃燒條件，節(jié)約能源。篦式冷

8、卻機主要由以下幾部分組成：下殼體、上殼體、篦床、篦床液壓傳動裝置、篦床支撐裝置、熟料破碎機、自動潤滑裝置及冷卻風(fēng)機組等。 reciprocating grate cooler is one of Rotary's major ancillary equipment, its role is to reduce the clinker temperature, improve the clinker quality, improve the grind ability of clinker, and improve secondary air temperature, change th

9、e flame conditions, save energy. Grate cooler mainly by the following components: the next shell, the shell, grate bed, grate bed hydraulic actuator, grate bed supporting device, clinker crusher, automatic lubrication system and cooling units such as wind.2、施工前準(zhǔn)備a、施工人員熟悉圖紙、安裝說明書等技術(shù)文件。b、施工圖會審。c、熟悉施工現(xiàn)

10、場和設(shè)備堆放場地。d、準(zhǔn)備施工工機具、材料及施工電源。e、做好施工方案及技術(shù)交底（包括質(zhì)量、安全措施）。B. pre-construction preparationa, officials familiar with the construction drawings, installation instructions and other technical documents.b, Check construction drawings.c, familiar with the construction site and equipment stack space.d, the cons

11、truction work to prepare equipment, materials and construction of power supply.e, well construction program and technical disclosure (including the quality, safety).3、基礎(chǔ)驗收及放線a、基礎(chǔ)驗收：基礎(chǔ)驗收必須認真進行，安排專人進行此項工作，會同廠方、監(jiān)理及土建等有關(guān)部門，根據(jù)有關(guān)資料（工藝圖、基礎(chǔ)圖、安裝圖、驗收標(biāo)準(zhǔn)等）認真測量、記錄，驗收合格后，方可進行安裝施工。設(shè)備基礎(chǔ)各部分的偏差應(yīng)符合如下要求：C. foundation c

12、heck and marking linesa, foundation check basis of acceptance must be carefully carried out, arrange to carry out this work, together with the factory, supervision and civil works and other relevant departments, according to the data (process diagram and foundation drawing, installation plans, accep

13、tance criteria, etc.) carefully measuring, recording, post-acceptance before the installation works. equipment parts based on the deviation should meet the following requirements:序號SN名 稱items允許偏差allowed deviation(mm)1基礎(chǔ)外形尺寸size±302基礎(chǔ)坐標(biāo)位置（縱、橫中心線）coordinate（lengthways& transverse center lines

14、）±203基礎(chǔ)上平面標(biāo)高level0 -204中心線間的距離distance between center lines±1.05地腳孔中心位置center position of pocket±106地腳孔深度depth of pocket+20 07地腳孔垂直度verticality of pocket5/1000b、基礎(chǔ)放線：用經(jīng)緯儀或線墜等將窯體的軸線引到冷卻機基礎(chǔ)上。即劃出一條窯縱向中心線的延長線。以窯頭托輪的橫向中心線為基準(zhǔn)，將回轉(zhuǎn)窯窯口圈熱態(tài)工作點引到在冷卻機基礎(chǔ)上已畫出的窯的縱向中心線上。并在此點劃出與托輪橫向中心線相平行的線。以劃出的縱線為基準(zhǔn)，劃

15、出冷卻機的縱向中心線，允許偏差1.5mm。以劃出的橫向線為基礎(chǔ)劃出冷卻機的橫向中心線及冷卻機進料端第一根柱子的橫向中心線，其允差1.5mm。b, foundation lines mark fall with a theodolite or a line such as the axis of the kiln to the cooler based on the lead. That is to draw a vertical centerline of the extension line of the kiln. Kiln wheel to the horizontal center l

16、ine as the base, the rotary kiln thermal operating point lead lap to the cooling machine has been drawn based on the longitudinal center line of the kiln. And on this point to draw center line with the wheel horizontal parallel lines. to draw a vertical line as the base, draw cooler longitudinal cen

17、terline, to allow deviation of 1.5mm. to draw the horizontal line is drawn based on the horizontal center line of the cooling machine and cooling machine feeding the first columns of the lateral end of the center line, its tolerance 1.5mm.4、設(shè)備出庫和檢查根據(jù)設(shè)備圖和裝箱清單仔細檢查設(shè)備零部件的數(shù)量和質(zhì)量，認真填寫設(shè)備開箱檢查記錄。D Equipment p

18、ackage checkAccording to maps and packing equipment, equipment parts list carefully check the quantity and quality, carefully fill in the equipment out of the box inspection records.5、篦冷機機體安裝a、側(cè)框架安裝：篦冷機基礎(chǔ)經(jīng)核對無誤后，按如下工序進行安裝。 放置第一段固定側(cè)框架和底板（梁）于基礎(chǔ)上。放置第二段固定側(cè)框架和底板（梁）于基礎(chǔ)上。放置第三段固定側(cè)框架和底板（梁）于基礎(chǔ)上。根據(jù)側(cè)框架的安裝布置及部件圖對

19、側(cè)框架進行找正。垂直度偏差為±1mm/m。相對標(biāo)高允差±1mm。水平度允差0.1mm/m。同段的兩片框架跨距應(yīng)符合圖紙要求，允差2mm，對角線允差3mm。找正合格后地腳灌漿、養(yǎng)生，當(dāng)強度達設(shè)計強度的75%后，即可進行下步施工。ECooler body erectiona, Side Framework installed:Cooler base is verified by the following procedure to install. Place the first paragraph of the framework of the fixed side and

20、bottom (beam) at the foundation. Place the second paragraph of the fixed side of the frame and floor (beams) on the basis of. placed third paragraph of the fixed side of the frame and floor (beams) on the basis of. According to the installation side of the frame layout and framework components map t

21、o find is the opposite. Perpendicularity deviation of ± 1mm / m. Relative elevation of tolerance ± 1mm. Degree tolerance level 0.1mm / m.The framework of the same span of paragraph 2 should be consistent with drawings, tolerance 2mm, diagonal tolerance 3mm.Alignment of the feet after passi

22、ng the filling, and health, when the strength of up to 75% of design strength, you can proceed to the next step construction.b、底板安裝：安裝漏料鎖風(fēng)裝置的漏斗及格柵。按圖紙要求的位置依次將底板通過走線、倒鏈吊裝到位，并按圖施焊。 安裝前端墻板，把緊螺栓，并連續(xù)焊接到側(cè)框架和底板支承梁上。 安裝下隔墻板，把緊螺栓并連續(xù)焊接到側(cè)框架上，同時和底板或支承槽鋼焊接。b, floor installation: installation materials to the loc

23、k device of the funnel and the wind grid. position by drawing in turn will take the line through the floor, hoisting chain back in place, press the Map on welding. Install the front wall, put the bolt, and continuously welded to the side of the frame and the floor supporting beam. Install a partitio

24、n wall, the bolts tight and continuous welded to the side of the frame at the same time and channel bottom or supporting welding.c、托輪支架安裝：復(fù)查、調(diào)整側(cè)框架的鉛垂度及兩片頂梁的跨距與對角線。依次將托輪支架吊裝到位。 將托輪支架通過角鋼焊在側(cè)框架立柱上。c, roller bracket installation: review, adjust the side frame of the verticality and two roof beams and di

25、agonal stride. in turn lifting the wheel bracket in place. The roller bracket by welding angle iron framework in the column on the side.d、安裝托輪組：同一段托輪組應(yīng)在同一直線上，允差±0.5mm。托輪組應(yīng)與篦冷機中心線對稱，允差±0.5mm。同段托輪組相互平行，對角線允差±2mm。d, install the wheel group: group with a wheel should be along the same lin

26、e, tolerance ± 0.5mm. wheel group should be cooler center line of symmetry, tolerance ± 0.5mm. paragraph supporting rollers with parallel, diagonal tolerance ± 2mm.e、安裝傳動裝置：按圖紙設(shè)計的位置將傳動軸軸安裝到位。 軸的水平度、允差0.2/1000。液壓系統(tǒng)安裝：i安裝時先卸下密封裝置，將殼體內(nèi)連接板和密封裝置的其他裝置的其他部件分開并固定在殼體內(nèi)側(cè)，然后將軸穿過殼體，安裝好密封裝置的其他部件、液輪

27、裝置、行走車、軸承座、液壓缸、行程開關(guān)裝置等。ii安裝時應(yīng)確保軸水平，兩側(cè)的中心線嚴(yán)格對稱。iii行程開關(guān)裝置安裝在距離液壓站近的一側(cè)。iv安裝液壓缸前，先將傳動主軸精確調(diào)整到正中間位置并固定住，然后用液壓缸安裝工具將軸承座固定好、擰緊螺栓，按要求焊接牢固后方可裝入液壓缸。v止動墊片待將螺栓擰緊后折彎。e, installation of transmission: design by drawing the location of the shaft axis to install in place. the horizontal axis, tolerance 0.2/1000. hydr

28、aulic system installed: i remove the seal before installation will interconnect and seal within the shell of other devices and other components separately fixed inside the shell, then through the shell axis, installed in other parts of sealing devices, hydraulic wheel device , running car, bearing,

29、hydraulic cylinders, limit switch devices. ii should be installed to ensure that the axis level, on both sides of the center line of strict symmetry. iii travel switch device installed in the distance near the side of the hydraulic station. iv installation of hydraulic cylinder first before fine-tun

30、ing of the transmission shaft to the middle position and securely, and then install the tool cylinder bearing fixed, tighten the bolts, as required welding firm before they can mount the hydraulic cylinder. v stopper gasket when tightening bolts after the bend. f、活動框架安裝：在地面上預(yù)組裝活動框架裝置，檢查每段框架的對角線，其偏差L

31、1-L2±3mm將活動框架吊裝到托輪裝置上?；顒涌蚣苤行木€必須與篦冷機中心線相重合。然后將活動框架用螺栓固定到傳動軸座架上,并用調(diào)整楔鐵及頂絲將傳動座架夾緊在活動框架的傳動軸托架上。檢查活動框架頂面標(biāo)高尺寸,并做必要調(diào)整。f, activity framework installation: In the framework of the activities on the ground pre-assembly unit, check each piece of the framework of the diagonal, the deviation of L1-L2 <&#

32、177; 3mm the framework of activities to the wheel lifting device. centerline framework of the activities must coincide with the center line of grate cooler. Framework of the activities and then bolted to the rack shaft seat, and by adjusting the wedge and the top wire will be clamped in the activiti

33、es drive the mounting bracket on the frame of the drive shaft. Check the top level dimensions framework of the activities and make necessary adjustments.g、篦板安裝：篦板梁根據(jù)所分布區(qū)域溫度不同采取的材質(zhì)也不同，安裝時必須按設(shè)計要求進行布置。篦板安裝：從卸料端開始,將第一和第二固定篦板梁緊固到側(cè)框架角鋼支座上,然后,在它們之間安裝活動篦板梁,調(diào)好梁間的間距,在篦板梁上安裝篦板,并保持篦板和螺栓在安裝圖中給定的第一、二排固定篦板頂面的尺寸(利用

34、卸料端第一排固定篦板作為基準(zhǔn)作業(yè)點)。通過調(diào)篦板梁兩端的墊片來調(diào)整活動篦板,與固定篦板之間交疊垂直間隙,且盡量使間隙均勻并保證在要求的范圍之內(nèi),垂直間隙值見篦床的安裝圖。 如上所述,從卸料端按三排(固定、活動、固定)為一組依次地朝進料端重復(fù)上述工序。為了保證組間的垂直間隙相同,前后兩組應(yīng)交迭進行。使篦板梁和篦板推料面與篦冷機的中心線垂直,在確認各部尺寸與圖紙要求相符后,用螺栓將篦板緊固到篦板梁上。篦板安裝按所需的篦板和篦板梁布置按圖進行。注意按要求調(diào)整好篦板橫向及垂直間隙。所有的篦板梁和篦板調(diào)整找正并固定好以后，按安裝圖安裝盲板。g, grid plate installation: grat

35、e plate beam according to the temperature distribution is different in different materials to the installation must be arranged according to design requirements. grate plate installation: Starting from the discharge end, the first and second fixed comb plate fastened to the side of the frame beam be

36、aring angle, and then, in their activities between the grate plate girder installation, tuning the spacing between beams in the grate plate beam Install grate plate and grate plates and bolts to keep the figure given in the installation of the first and second rows of the top comb plate size (using

37、the discharge end of the first row of the fixed comb plate as the base operating point). Beam by adjusting the grate plate gasket to adjust activities across the grate plate, and the vertical overlap between the fixed comb plate gap, and even as far as possible gaps and to ensure the required range,

38、 the vertical gap values, see the installation diagram grate bed. As noted above, from the discharge side by three rows (fixed, activities, fixed) for a group order to move the feed side to repeat the process. In order to ensure the vertical clearance between the same group, before and after the two

39、 groups should be overlap. Beams and comb to comb plate plate pusher grate cooler surface and the center line of vertical, in identifying the size and drawings in line ministries, the grate plate will be fastened with bolts to the grate plate beam. Grate plate installed by the required plate girder

40、grate plate and grate arrangement according to diagram. Note that the required adjust horizontal and vertical grid plate gap. All of the grate plate and grate plate adjusting beam alignment and fixed, then, according to installation diagram to install blind plate. h、上機殼安裝：安裝上機殼鋼構(gòu)架。焊接側(cè)壁板、頂板。首先檢查檢查口、進

41、風(fēng)口等的形位公差，是否符合圖紙要求，要核對側(cè)壁板、頂板的編號，對號就位。施焊時要求氣密性好，不得有漏焊、氣孔等疵病。h, upper casing installation: Install the chassis steel frame. welded wall panels, roof.First check the inspection port, the inlet shape and position tolerances, etc., whether the drawings, to check wall panels, roof number, sit in the right

42、place. Shi welding required airtightness, not tainted welding, porosity, etc. Defects.i、 安裝頂部殼體和沖擊板。i, install the top of the shell and the impact plate.j、安裝機外固定及活動充氣風(fēng)管的主管道，注意適當(dāng)調(diào)整風(fēng)管與風(fēng)機相連部分的角度及長度，使其與風(fēng)機良好相配。j, install the machine and the activities of external fixation in charge of Road inflatable air

43、 duct, attention to appropriate adjustments to some of the wind pipe and fan connected to the angle and length to make it a good match with the fans.6、破碎機安裝F Crusher erection7、潤滑系統(tǒng)安裝a、按設(shè)計圖紙布置進行安裝。b、管道布置要牢固、整齊、美觀，力求捷徑，減少彎曲，彎曲半徑不小于管徑的3倍。c、管路安裝前應(yīng)進行酸洗，內(nèi)部不允許有鐵屑、氧化皮、雜物等。d、分配器應(yīng)安裝在易受到指示桿操作的地方，并使指示桿均指向一個方向。G

44、Insulating system erectiona, according to design layout drawings for installation.b, piping layout should be firm, clean, beautiful, sought a shortcut to reduce bending, bending radius of not less than 3 times the diameter.c, pipe pickling should be carried out before installation, within the allowe

45、d iron, oxide, and other debris.d, dispenser should be installed in vulnerable areas joystick directions, and to instruct all point to a direction lever.8、無負荷試運轉(zhuǎn)a、試車前準(zhǔn)備工作首先應(yīng)檢查各聯(lián)接螺栓是否擰緊，尤其是一些重要的部位，如地腳螺栓、活動框架與傳動軸的聯(lián)接螺栓、篦板與篦板梁的聯(lián)接螺栓、篦板梁與活動框架及側(cè)框架的聯(lián)接螺栓等。各風(fēng)機風(fēng)管內(nèi)暢通無異物，漏料斗中無異物，篦冷機各處不能有防礙其運行的工具及雜物存在。啟動油泵，檢查是否出油

46、，分配閥的工作情況，管路是否有滲漏，起動調(diào)整潤滑系統(tǒng)，確認供油系統(tǒng)工作正常。點動電動機檢查運轉(zhuǎn)方向是否正確。 檢查各溫度計及壓力表指針是否靈活準(zhǔn)確。HLoad free running testa, pre-trial preparation should first check whether the connection bolts tightened, especially in some important parts, such as anchor bolts, a framework for activities connected with the drive shaft bol

47、ts, grate plate and grate plate beam connection bolts, grate plate girder frame and side with the activities framework connection bolts. The fan duct no foreign body within the flow, no foreign body in the drain hopper, grate cooler running around can not have hampered the tools and debris in its ex

48、istence. Start pump, check out the oil, the work of distribution valves, pipes have leaks, starting to adjust lubrication system, oil supply system is working correctly identified. Check operation to move the motor direction is correct. Check the thermometer and pressure gauge pointer is flexible an

49、d accurateb、試運轉(zhuǎn)篦冷機主要空負荷試車時間不得小于8小時。 運轉(zhuǎn)時仔細檢查傳動是否平穩(wěn)，無異常聲響。 篦床運行平穩(wěn)，無卡碰、跑偏現(xiàn)象，篦縫均勻。 液壓系統(tǒng)工作正常。 各部位軸承不允許有過熱現(xiàn)象。 潤滑系統(tǒng)工作良好，各潤滑點滿足潤滑和密封要求，管路無滲漏情況。 各測量設(shè)備、控制裝置及報警裝置工作正常。 各風(fēng)機工作正常。以上檢查項目必須認真做好記錄。b, commissioning cooler time of the main air load testing not less than 8 hours.     carefully check

50、 the drive is running smoothly, no abnormal sound.     grate bed is stable, no card touch, deviation phenomenon, even sew grate.     hydraulic system working properly.     various parts of bearings does not allow overheating.  

51、60;  lubrication system working well to meet the lubrication points, lubrication and sealing requirements, pipeline without leakage.     The measurement equipment, control devices and alarm device is working properly.     The fan is working properly.Check

52、 the above items must be seriously good record.五、施工技術(shù)保證措施1各道工序的施工，必須嚴(yán)格執(zhí)行施工規(guī)范及設(shè)備安裝圖紙；2現(xiàn)場出現(xiàn)的設(shè)計更改，修配改工作，必須辦理現(xiàn)場簽證手續(xù)，并報AVIC工程師審批，批準(zhǔn)后執(zhí)行。5， technique guarantee1. Each process of construction, must be strictly enforced construction specifications and installation drawings;2. Scene design changes, repair wor

53、k to change, to apply for the visa site and report to the AVIC Engineer for approval, approval and implementation.六、 安全與文明施工保證措施 1、 安全工作方針： 以防為主，防管結(jié)合，專管與群管相結(jié)合，做到文明施工，以人為本，安全第一。 2、 保證措施: 1） 現(xiàn)場設(shè)置專職安全管理機構(gòu)。 2） 在計劃、布置、檢查、總結(jié)、評比生產(chǎn)任務(wù)的同時，計劃、布置、檢查、總結(jié)、評比、安全工作。 3） 根據(jù)工程進度情況和季節(jié)情況，組織進行施工階段性安全大檢查和季節(jié)性安全大檢查，對不安全情況，限期

54、整改落實到施工班組和人員上。 4） 進入施工現(xiàn)場的一切工作人員，必須正確穿戴好防護用品。 5） 施工現(xiàn)場文明整潔、材料、設(shè)備、機具放置有序道路暢通。 6）集體操作的工作，要分工明確，操作時應(yīng)有專人統(tǒng)一指揮，步調(diào)一致。 7） 工機具使用前必須檢查，消除事故隱患。 8） 夜間施工時要有足夠的照明設(shè)施。 9） 吊裝作業(yè)的規(guī)定 a、吊裝設(shè)備必須有專人負責(zé)指揮，吊裝前，要進行安全交底。 b、起吊前，對起吊重物的重量一定要查清，嚴(yán)格計算，選擇吊點，嚴(yán)禁吊裝機具超負荷工作。 c、吊裝前，對于大件一定要試吊，起吊后重物下面嚴(yán)禁站人，大型設(shè)備吊裝時，要設(shè)警戒線。 d、設(shè)備就位時，嚴(yán)禁把手、腳塞入起吊物和墊木、墊

55、塊之間，以免壓傷。 e、所有鋼絲卡扣要卡牢，鋼絲繩和卡扣要符合規(guī)定要求。 10） 防火、防爆措施 a、氧氣瓶、乙炔瓶等易燃易爆物品，嚴(yán)禁碰撞和在太陽下直曬。 b、在進行焊(割)工作時，應(yīng)將周圍易燃易爆品清除，或防護，防止火花濺落引起燃燒或爆炸。 c、清洗設(shè)備時，嚴(yán)禁吸煙，清洗油嚴(yán)禁亂倒。 d 、施工現(xiàn)場應(yīng)設(shè)有消防器材。 15） 臨時用電規(guī)定 a、現(xiàn)場臨時用電施工現(xiàn)場臨時用電安全技術(shù)規(guī)范的要求。b、施工現(xiàn)場使用的電氣工具，必須裝有漏電保護裝置及其它安全防護措施，絕緣性工具要經(jīng)常保持干燥，并經(jīng)常進行外觀檢查與耐壓試驗。6. Safty guarantee1, security policy: &#

56、160;   Case-based, anti-tube combination, specifically to deal with the combined control group, so that the construction of civilization, people-oriented, safety first.     2 assurance measures:       1) Setting the scene full-time sec

57、urity management institutions.       2) In the plan, layout, inspection, review and assessment of production tasks at the same time, planning, layout, inspection, review, assessment, safety at work.       3) According to the progress of the works and seasonal conditions, organizations, construction safety inspection and a seasonal periodic safety inspection, unsafe conditions, a deadline for rectification implemented in the construction team and p