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1、<p>  Paver screed</p><p>  1.1 Function Fulfilled by the Screed</p><p>  The screed, the road paver‘s working tool, fulfils the function of uniformly compacting the paving material across

2、the entire pave width and producing a close-textured and level surface. The screed‘s compacting systems shall pre-compact the mix to the greatest possible extent. This is to minimize the influence of layer thickness upon

3、 the amount of subsequent compaction by rolling when bringing about the pavement’s final density.</p><p>  For pre-compaction, different compacting systems are available:</p><p>  T = Tamper (an

4、 eccentric shaft causes the tamper bar to move up and down)</p><p>  V = Vibrators (vibrations are generated by an eccentric shaft acting on the screed plates at right angles to the direction of motion)</

5、p><p>  P = Pressure Bar(s) (the pressure bar(s) are hydraulically pressed onto the mix at a frequency of 68 Hz (approx.) and a maximum pressure of 130 bar)</p><p>  P1 = Screed equipped with 1 Pre

6、ssure Bar</p><p>  P2 = Screed equipped with 2 Pressure Bar</p><p>  1.2 Extending Screeds and Bolt-on Extensions</p><p>  For all VOGELE screeds, bolt-on extensions are available.

7、The VOGELE system of bolt-on extensions allows to easily and sturdily build up screeds to any pave width desired. Even when paving in large widths, VOGELE screeds work with highest precision and achieve superb degrees of

8、 uniform density right up to the pavement edges. When fitting bolt-on extensions, care must be taken to ensure that the bottom edge of the screed plate is flush with the adjacent units, otherwise a step may be produced i

9、n </p><p>  1.3 Set-Up of the Extending Screed</p><p>  1. Position both extending units in place so that the screed plate of the basic unit and the screed plates of the extending units are roug

10、hly level.</p><p>  2. Slacken the chains connecting the spindles on the extending unit so that each spindle can be adjusted independently.</p><p>  3. Carefully lower the screed onto the extend

11、ing units. Timber should be placed under the middle of the two extending units.</p><p>  4. Now adjust the screed planning angle via the tow point rams so that the screed plate rests on the timber.</p>

12、<p>  5. Remove the locking screw from the threaded bush on all spindles.</p><p>  6. Adjust all threaded bushes.</p><p>  7. Refit the locking screws.</p><p>  8. Raise the

13、screed and secure it so that it cannot sink.</p><p>  9. Lay a ruler along the inner and outer spindle pairs and then adjust the height of the extending unit via the front and rear spindles with the aid of a

14、 special wrench, so that the screed plate of the basic unit is level with the trailing edge of the extending unit. Now adjust the planning angle of the extending unit via the front spindle.</p><p>  10. Reco

15、nnect the spindle pairs with the chains.</p><p>  11. Raise the frame of the extending unit by approx. 4mm so that it roughly corresponds to the planning angle of the screed.</p><p>  12. During

16、 the first on-site job, the height of the extending units must be corrected until a longitudinal step is no longer visible.</p><p>  1.4 Fixed-Width Screeds</p><p>  1.4.1 Compacting Systems Ins

17、talled in Fixed-Width Screeds</p><p>  TV = Tamper and Vibrators</p><p>  Installed in:</p><p>  - SB 250 - SB 300</p><p>  Recommended for:</p><p>  -

18、All conventional mixes.</p><p>  - Materials which are easy to compact or thinner pavement layers.</p><p>  - Jobs where paving can be done in a largely constant width.</p><p>  Lar

19、ge radii.</p><p>  TP2 = Tamper and 2 Pressure Bars</p><p>  Installed in:</p><p>  - SB 250 (and Hydraulic Bolt-on Extensions)</p><p>  - SB 300 (and Hydraulic Bolt-on

20、 Extensions)</p><p>  Recommended for:</p><p>  - All conventional mixes.</p><p>  - A screed in TP2 version achieves a high pre-compaction even of thick pavement layers.</p>

21、<p>  - Mixes which are difficult to compact on account of their grain shape and consistency.</p><p>  - Jobs where paving can be done in a largely constant width.</p><p>  - Large radii.&

22、lt;/p><p>  - Less effort required for subsequent compaction by rolling.</p><p>  TP1 = Tamper and 1 Pressure Bar</p><p>  Installed in:</p><p>  - SB 250 (and Hydraulic B

23、olt-on Extensions)</p><p>  - SB 300 (and Hydraulic Bolt-on Extensions) Recommended for:</p><p>  - All conventional mixes.</p><p>  - Pre-compaction by a screed in TP1 version is h

24、igher than by a TV screed, but lower than by a screed in TP2 version.</p><p>  - Jobs where paving can be done in a largely constant width.</p><p>  - Large radii.</p><p>  - Less e

25、ffort required for subsequent compaction by rolling.</p><p>  TVP2 = Tamper, Vibrators and 2 Pressure Bars</p><p>  Installed in:</p><p>  - SB 250 - SB 300 - SB 250 B</p&g

26、t;<p>  Recommended for:</p><p>  - Jobs where paving can be done in a largely constant pave width.</p><p>  - Large radii.</p><p>  - SB 250, SB 300: All conventional mixes.

27、</p><p>  - SB 250 B: For paving PCC? as this type of job does not include subsequent compaction by rolling.</p><p>  1.4.2 Fixed-Width Screeds and Bolt-on Extensions</p><p>  As a

28、general rule, bolt-on extensions should be fitted symmetrically on both sides of the screed, wherever possible. The advantage of a Fixed-Width Screed is a deeper screed plate of 500mm compared to a screed plate of 250mm

29、found on Extending Screeds. This has a positive effect upon the screed‘s floating behaviour.</p><p>  Moreover, the leading edge of the Fixed-Width Screed forms a single line over the entire pave width and d

30、ifferent planning angles do not leave marks in the pavement. Fixed-Width Screeds are capable of handling considerably larger pave widths than Extending Screeds, albeit with restrictions as regards the screed‘s variabilit

31、y. As a result, Fixed-Width Screeds are particularly suited to paving long sections with a large, unchanging pave width.</p><p>  1.4.3 Building Up a Fixed-Width Screed with Bolt-on Extensions</p><

32、;p>  Bolt-on extensions are fitted to enlarge the screed’s width. The trailing edges of the screed plates shall be flush across the entire pave width. The leading edges of the screed plates should be set higher toward

33、s the outside by roughly 0.5mm.</p><p>  In order to prevent the bolt-on extensions from bending towards the rear as a result of the pressure exerted by the mix, horizontal braces must be fitted.</p>

34、<p>  Horizontal braces are to be fitted in such a way that the trailing edges of the screed plates are flush.</p><p>  To compensate the uplift at the outer edges of the screed, there should be a light

35、 sag of the screed when raised. The magnitude of this sag depends on the pave width. The sag can be adjusted by way of the braces over the screed’s basic unit.</p><p>  1.5 Set-Up of Tamper</p><p&

36、gt;  The tamper shall be set to an identical stroke length across the entire pave width. The setting can be changed by simply turning the eccentric bush on the shaft driving the tamper bar. The driving shaft is accessibl

37、e from behind, so that this can easily be done between job site sections. Adjusting the lower reversal point of the tamper bar, however, takes more time. First, the tamper shields need demounting. Then remove the screws

38、on all shaft brackets. After loosening the locking nut (2), the t</p><p>  1.6 Set-Up of Tamper Shield</p><p>  The tamper (3) must be set so that it rests on the wear strip (1) across the full

39、width. Then adjust the spring steel bar (2) on the tamper shield by means of screw (4) from the rear of the screed until a gap of 0.5 - 1mm is obtained between tamper bar and the spring steel bar. Release screws (6) and

40、fit various small shims (5) to align the tamper shield. With the tamper shield correctly aligned, the spring steel bar (2) is at least parallel with the tamper or preferably inclined slightly to the</p><p>&

41、lt;b>  Tip!</b></p><p>  At a stroke length of 2mm, the tamper bar should be flush with the screed plate</p><p>  (check with your hand).</p><p>  1.7 Set-Up of Pressure Ba

42、r(s)</p><p>  1. Unscrew the nut (2) with anti-twist device (3) on the hydraulic ram (1) for the pressure bar.</p><p>  2. Turn the hydraulic ram (1) to adjust the height of the pressure bar. Th

43、e clearance (7) between pressure bar and bottom edge of the screed plate should be at least 4mm.</p><p>  3. Check that the hydraulic ram for the pressure bar makes contact with metal plate (5) when retracte

44、d.</p><p>  4. Set pre-tension of spring (6) to 5.5mm via nut (4) to yield a distance (8) of 59.5mm.</p><p>  5. Resecure the hydraulic ram (3) for the pressure bar.</p><p>  1.8 Be

45、vel Irons</p><p>  Bevel irons shape and compact the edges of the pavement. They are available with a bevel edge of 45° and 60°. Their size depends on the thickness of the layer to be paved.A heati

46、ng rod can be installed as an option to improve the sliding properties of the bevel iron.</p><p>  1.9 Function Check of Screed Heating</p><p>  All screed components in contact with the hot mix

47、 should be heated to approx. 90 °C before starting work. It is recommended to protect the screed against excessive loss of heat to the surroundings so that the heating power can be utilized effectively, for instance

48、 by putting down the screed, preferably on hot mix. Asphalt may stick to the tamper bar, screed plates or pressure bar(s) if the screed temperature is too low. This can lead to the formation of strips and an irregular su

49、rface texture. T</p><p>  Should one of the green indicator lights extinguish over a prolonged period of time, then the reason may be:</p><p>  n Poor insulation</p><p>  n Asymmetr

50、ical power consumption</p><p>  n Generator temperature too high</p><p><b>  Tip!</b></p><p>  Directly after switching on screed heating, correct operation of the heati

51、ng rods can be checked by cautiously touching the tamper bar, screed plates and pressure bar(s).</p><p>  Advantage:</p><p>  A failure of heating rods is detected immediately. New parts can be

52、procured without delay to promptly restore the screed‘s full functionality.</p><p>  Parameters Influencing the Paving Process</p><p>  2.1 Paving Material</p><p>  2.2 Paving Param

53、eters</p><p>  2.3Relationship Between Tamper Speed and Pave Speed</p><p>  While paving, when screed tow point rams are not changed in position, an equilibrium of forces comprising pave speed,

54、screed weight and tamper speed is established. If any one of these parameters changes, this immediately affects the screed‘s floating behaviour. Tamper speed and pave speed are very strongly dependent on one another. Any

55、 change in pave speed without changing the tamper speed and position of the screed tow point rams will affect pre-compaction of the mix. If the pave speed is incr</p><p>  Paving with Automated Grade and Slo

56、pe Control</p><p>  If Automated Grade and Slope Control is used for paving, the desired elevation of the screed can be maintained by increasing the planning angle, but pre-compaction will not remain constan

57、t.</p><p>  After Compaction by Rolling</p><p>  When the roller passes over the mix, the amount of extra compaction will differ on account of varying pre-compaction and result in irregularities

58、 in the surface.</p><p>  2.4Functions of the Hydraulic Rams for Raising / Lowering the Screed</p><p>  Screed Float</p><p>  Normally, mix is paved with the screed in Screed Float

59、mode. In other words, the piston-side and rod-side valves operating the hydraulic rams are open for free up and down movement.</p><p>  Screed Assist</p><p>  If the bearing capacity of the mix

60、is poor, the screed will not reach the desired elevation even when set to a large planing angle. The Screed Assist function allows pressure to be applied separately to the right and left-hand hydraulic rams from below. T

61、his pressure counteracts the screed weight and allows it to float up in accordance with the magnitude of the pressure.</p><p>  Screed Freeze</p><p>  The Screed Freeze function is activated aut

62、omatically following a paver stop in Screed Float mode. The valves activating the hydraulic rams for raising / lowering the screed are closed on both the piston and the rod sides, thus briefly suspending the Screed Float

63、 mode in order to prevent irregularities in the pavement when resuming paving.</p><p><b>  攤鋪機(jī)的熨平板</b></p><p>  1.1熨平板履行的功能</p><p>  熨平板是道路攤鋪機(jī)的工作工具,能達(dá)到均勻密實整個攤鋪寬度的攤鋪材料和生產(chǎn)

64、質(zhì)感密切而且水平的表面的功能。熨平板的壓縮系統(tǒng),緊湊的組合到最大限度。這是為了盡量減少當(dāng)達(dá)到路面的最終密度時滾動對后續(xù)壓實層厚度的影響。</p><p>  對于預(yù)壓實,有不同的壓縮系統(tǒng)可供選擇:</p><p>  T=振搗夯錘(偏心軸使振搗夯錘向上和向下移動) V =振動器(振動產(chǎn)生的偏心作用在熨平板直角軸的運(yùn)動方向) P =壓力桿(壓力桿是液壓壓力在組合頻率68赫茲(約)和130

65、桿的最大壓力) P1 =熨平配備1壓桿 P2 =熨平配備2壓桿</p><p>  1.2 伸縮式熨平板和螺栓擴(kuò)展裝置</p><p>  對于所有的福格勒熨平板,都可以使用螺栓擴(kuò)展裝置。福格勒熨平板的螺栓擴(kuò)展系統(tǒng)可以很容易的得到任何所需寬度的熨平板。即使在一個大的寬度鋪路時,福格勒熨平板的工作精度仍然最高,而且可以使路面邊緣的均勻密度達(dá)到精湛的程度,當(dāng)安裝螺栓擴(kuò)展裝置時,必須采取護(hù)理

66、措施,以確保熨平板的底邊是與相鄰的部位平齊,否則一個小步驟都可能使攤鋪路面或熨平規(guī)劃角度發(fā)生改變。在攤鋪機(jī)的鋪設(shè)過程中,對預(yù)壓實,表面結(jié)構(gòu)和熨平板的浮動行為可以有一個消極的影響。</p><p>  1.3向上延伸式熨平板</p><p> ?、?擴(kuò)大延伸部位,使熨平板的基本部位和熨平板的延伸部位大致水平。 Ⅱ.放松鏈來連接擴(kuò)展部位的主軸,使每個主軸都可以獨立調(diào)整。 Ⅲ.仔細(xì)降低熨平板

67、的延伸部位。振搗夯錘應(yīng)安裝在兩個延長部位中間。 Ⅳ.通過撞擊的牽引點來調(diào)整熨平板的熨平刨角,使熨平板依賴于振搗夯錘。</p><p> ?、?從所有主軸的螺紋襯套中調(diào)整鎖緊螺釘。 Ⅵ.調(diào)整所有的螺紋軸套。 Ⅶ.重新裝上鎖緊螺釘。 Ⅷ.提高找平層并且固定它,以便它不能下沉。 Ⅸ.奠定了一個沿主軸內(nèi)部和外部的統(tǒng)治者,然后借助一個特殊的扳手,通過主軸的前部和后部調(diào)整延伸部位的高度,以便熨平板的基本部位與擴(kuò)展部

68、位后緣是水平的。然后通過主軸前端調(diào)整延伸部位的刨角。 Ⅹ.連接主軸和鏈。 Ⅺ.提高延伸部位的結(jié)構(gòu)約4毫米,使它與熨平板的刨角大致相符。 Ⅻ.在第一次現(xiàn)場工作中,必須糾??正延伸部位的高度直到縱向的平臺不再可見。 1.4寬度固定的熨平板</p><p>  1.4.1安裝有壓縮系統(tǒng)的固定寬度的熨平板</p><p>  1.4.2固定寬度的熨平板和擴(kuò)展螺栓</p>&l

69、t;p>  作為一般規(guī)則,在擴(kuò)展的螺栓兩側(cè)應(yīng)盡可能裝有對稱熨平板。一個固定寬度的熨平板的優(yōu)勢是與250mm的熨平板相比,500mm熨平板多了一個延伸熨平板。這對熨平板的浮動行為有積極的作用。此外,固定寬度熨平的領(lǐng)先優(yōu)勢是形成了整個攤鋪寬度超過一行和不同的刨角不離開路面的標(biāo)志。固定寬度的熨平板對于相當(dāng)大的攤鋪寬度處理能力比延伸熨平板強(qiáng),雖然它有限制熨平板的變異。因此,固定寬度的熨平板特別適合攤鋪一個大的、長的路段,且保持不變的攤鋪寬

70、度。 1.4.3建立固定寬度的熨平板和螺栓的擴(kuò)展</p><p>  螺栓上的擴(kuò)展配備擴(kuò)大熨平板的寬度。熨平板的后緣應(yīng)和整個攤鋪寬度平齊。熨平板的前緣應(yīng)朝外面高出大約0.5毫米。為了防止施加混合壓力,螺栓向后方彎曲時擴(kuò)展,且必須安裝水平支撐。水平支撐以和熨平板后緣平齊的方式安裝。為了彌補(bǔ)熨平板的外緣隆起,在熨平板提升時應(yīng)該有一個輕微的凹陷。這個凹陷的大小取決于攤鋪寬度。凹陷可以以熨平板的基本裝置伸張的方式來調(diào)整

71、。</p><p>  1.5振搗夯錘的設(shè)置</p><p>  振搗夯錘應(yīng)設(shè)置一個與整個攤鋪寬度相同的行程長度。只需轉(zhuǎn)動在振搗夯錘驅(qū)動軸上的偏心軸瓦就可以改變這個設(shè)置。傳動軸是從后面接近,以便可以很容易地完成工作現(xiàn)場之間的作業(yè)。但是,調(diào)整振搗夯錘的較低的逆轉(zhuǎn)點需要更多的時間。首先,振搗夯錘的外殼需要拆卸。然后移動所有軸支架上的螺絲。在松開鎖緊螺母(2)后,振搗夯錘的桿可以通過螺栓(1)來

72、調(diào)整。高度根據(jù)振搗夯錘沖程的選擇來設(shè)置的。</p><p>  1.6振搗夯錘外殼的設(shè)置</p><p>  振搗夯錘(3)必須被設(shè)置,以便它在橫跨整個寬度時依賴于消耗沉淀槽(1)。然后通過熨平板后方的螺絲(4)來調(diào)整振搗夯錘上的彈簧鋼條(2),直到振搗夯錘的桿和彈簧鋼條之間的縫隙為0.5 - 1毫米。松開螺絲(6),安裝各種小墊??片(5)以調(diào)準(zhǔn)振搗夯錘。隨著振搗夯錘的調(diào)準(zhǔn),彈簧鋼條(2

73、)至少平行于振搗夯錘或最好向前稍微傾斜。如果必要的話,檢查振搗夯錘和彈簧鋼條之間的間隙。</p><p>  注意! 在行程長度為2mm時,振搗桿應(yīng)該與熨平板平齊。</p><p><b>  1.7壓力桿的設(shè)置</b></p><p> ?、?擰松液壓油缸(1)上反捻裝置(3)的螺母(2)來使壓力桿工作。</p><p&

74、gt; ?、?打開液壓油缸(1)調(diào)整壓力桿的高度。壓力桿和熨平板底部邊緣之間的間隙(7)至少應(yīng)有4毫米。</p><p> ?、?檢查液壓油缸,使壓力桿和金屬板(5)在接觸時撤回。</p><p> ?、?通過螺母(4)把彈簧(6)的預(yù)張力設(shè)置為5.5毫米,以產(chǎn)生59.5毫米的距離(8)。</p><p> ?、?為了壓力桿重復(fù)加固液壓油缸。</p>

75、<p><b>  1.8斜角鐵桿</b></p><p>  斜角鐵桿的形狀和結(jié)構(gòu)緊湊的路面的邊緣。 他們提供了45°和60°的倒角,其大小取決于鋪層的厚度??梢园寻惭b一個加熱棒作為改善錐鐵的滑動性能的一個選項。</p><p>  1.9熨平板加熱功能檢查</p><p>  在開始工作前,所有與混合熱接觸的熨

76、平板組件都應(yīng)加熱到90°Ç左右。為了保護(hù)熨平環(huán)境不損失過多的熱量,而使加熱功率能夠被有效利用,最好是放下熨平板,選擇混合熱。如果熨平板溫度太低,瀝青可能會粘到振搗夯錘,熨平板或壓力桿上。這種現(xiàn)象可能會導(dǎo)致裂紋的形成和不規(guī)??則的表面紋理。在達(dá)到操作溫度之前,熨平板的浮動行為可能會有所變化,同時導(dǎo)致鋪層的厚度可能有所不同,而且會偏離所需的結(jié)果。對于”dash 2”機(jī),一個熨平板供熱的監(jiān)測裝置是可有可無的。這一特征監(jiān)視每

77、個加熱棒的功能是否正常,并表示沒有任何故障延誤。</p><p>  綠色指示燈熄滅過長時間,原因可能是:</p><p><b>  ※保溫性能差</b></p><p><b>  ※功耗不對稱</b></p><p><b>  ※發(fā)電機(jī)溫度過高</b></p>

78、;<p><b>  提示!</b></p><p>  直接打開熨平板加熱開關(guān)后,通過輕輕地碰觸振搗夯錘,熨平板和壓力桿來檢查加熱棒的正確操作。</p><p>  優(yōu)點:可以立即檢測加熱棒的故障??梢再徺I新的部件并毫不拖延地恢復(fù)熨平板的全部功能。</p><p>  鋪裝過程中的影響參數(shù)</p><p>

79、;<b>  2.1鋪裝材料</b></p><p><b>  2.2攤鋪參數(shù)</b></p><p>  2.3振搗夯錘速度和攤鋪速度的關(guān)系</p><p>  在鋪路時,當(dāng)熨平板牽引點的位置不改變,就會建立一個由鋪設(shè)速度,熨平板的重量和振搗夯錘速度組成的力量的平衡。如果這些參數(shù)的任何一個變化,會立即影響熨平板的浮動行

80、為。振搗夯錘速度和鋪設(shè)速度非常強(qiáng)烈的彼此依賴。振搗夯錘的速度和熨平板牽引點沒有任何改變而只改變攤鋪速度,將會影響混合料的預(yù)壓實。如果攤鋪速度增加,而增加振搗夯錘速度沒有同時增加,混合料的承重能力將降低,而且熨平板會在陡峭的刨角設(shè)置較薄的鋪層。</p><p><b>  鋪路中自動斜坡控制</b></p><p>  如果自動化斜坡控制用于攤鋪中,熨平板所需的高度就可

81、以通過提高規(guī)劃的角度來維持,但預(yù)壓實不會保持不變。</p><p><b>  滾動壓實后</b></p><p>  當(dāng)滾軸經(jīng)過混合料,額外壓實量對不同的預(yù)壓實會有所不同,而且會產(chǎn)生不規(guī)則的表面。2.4提高/降低熨平板浮動的液壓油缸的功能</p><p>  通常情況下,混合料是在熨平板處于熨平浮動模式下被攤鋪的。換句話說,活塞端和桿端閥門

82、的操作是在液壓油缸被打開且向下運(yùn)動時進(jìn)行的。</p><p><b>  熨平板的協(xié)助</b></p><p>  如果混合料的承載能力差,即使設(shè)置大刨角,熨平板也不會達(dá)到預(yù)期高度。熨平板的輔助功能允許壓力分別從下邊作用于右手的液壓油缸和左手的液壓油缸。這種壓力抵消了熨平板的重量而且允許它根據(jù)壓力的大小來浮動。</p><p><b>

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