查阅我国近几年全国固定资产投资的数额和建筑业的产值

2025-03-04 19:21:47
推荐回答(2个)
回答1:

总算弄完了,祝楼主成功!~~~~~~~~(还有一篇很好的文章,因为字数现实,所以给你网址:
h0t0t0p0://zhidao.baidu.com/question/69336630.html
把最前面的4个“0”去掉后在输入哦~~

10万亿总投资乃是今后3—5年的投资总蓝图,其中相当部分原本已经在“十一五”甚至“十二五”计划中。

2004年07月22日 07:00
中新社北京七月二十一日电(记者王彤)中国国家统计局最新公布的统计数据显示,今年上半年,中国全社会累计完成固定资产投资二万六千多亿元人民币,同比增长了百分之二十八点六,增幅比一季度回落了十四点四个百分点。城镇累计完成投资增幅回落十六点八个百分点;农村累计完成投资增幅回落九点一个百分点。

近年来,控制爆破技术在我国的各项建设中,越来越得到广泛的应用。尤其是在铁路、公路、隧道、港口、地下工程建设中的艰难施工地段,都需要应用它。例如,宝成铁路修至中段,嘉陵江水蜿蜒地流过山脚,呈Q形。不改直江道,铁路线就必需两度跨江。这时,人们通过精心的爆破设计和施工,将200余吨炸药分别装在30个药室中……。倾刻间山峦变成河谷,炸出一条长和宽都符合要求的新河道,收到了免修铁桥两座、工期提前了半年、节省30万元投资的三重效益。

我国地域广大,河流纵横分布,据统计,全国水力资源理论蕴藏量达6.8亿KW,居世界之冠。其中,可开发的装机容量为3.8亿KW.然而,80%的水力资源皆蕴藏在深谷江河之中,开发利用极为不便。为了利用这些取之不尽的水力资源,我国已采用了定向爆破筑坝技术来建筑水库,进行水力发电和灌溉农田。据统计大型定向爆破筑坝已达30座以上,使干旱的高原或沙漠出现了不少新的绿洲。此外,我国很多省份,已将控制爆破用于农田基本建设中,如削梁填沟、筑坝围困、移山造田等,为实现农业现代化做出了贡献。

众所周知,建筑工程需要大量的石材和料石。过去用普通爆破法开采料石,爆下的石块不成材,碎块多。利用控制爆破法,如预裂爆破、预切爆破、成型切割爆破等,可以开采出合乎建筑规格雏形的花岗岩、大理石和汉白玉等料石。控制爆破之所以能成形,其奥秘就在于加密炮孔,确保孔距小于由炮孔中心至临空面的距离,使炸药爆炸产生的应力波,首先在炮孔连线上炸出一条贯通性的裂缝,然后通过高温、高压爆炸气体的膨胀作用,将初步切割成型的料石推移出去。这就好像巧匠凿出料石,大力士搬移料石一样。

随着城市的改建和扩建,旧建筑物、构筑物等的拆除工作日益增多。早在五十年代,我国的爆破工作者,就在国内首次成功地用定向控制爆破拆除了市区内高达数十米的钢筋混凝土烟囱。前不久,某市采用控制爆破拆除了一座高14.4m,跨度为27.6m的钢筋混凝土结构的城门牌楼。离它仅十几米远的建筑物以及在牌楼地下通过的总自来水管和电缆都安全无恙。在国外,曾用控制爆破拆除了市区十余层至32层的大厦。一般皆先炸坍楼房之一角或一侧,随后每隔数十毫秒至半秒的间隔,连续起爆成百上千的炮孔,倒塌建筑物的碎片全部控制在5m~25m的范围内。

最近,我国又采用高能燃烧剂进行近人爆破试验,成功地用于石料和混凝土的切割或拆除。爆后完全无飞石现象,因而对近旁人员、设备等无损伤,这是我国在控制爆破技术上的又一个新的突破。

回答2:

zhidao.baidu.com/question/69336630.html

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