There are more and more kinds of thermal insulation building materials on the market. In the meantime, the thermal insulation products of polyurethane materials are enough for consumers to see for a period of time. Ordinary consumers are still very concerned about the price when choosing and purchasing, so I will first look at the market price of polyurethane direct-buried thermal insulation tubes. According to the development situation of prefabricated polyurethane insulating pipes, the price of directly buried insulating pipes has a great fluctuation compared with the previous period, which is undoubtedly good news for consumers. The price factor is certain. Let's take a look at the most important part, the technical parameters, and how the polyurethane direct-buried insulation pipe is heating.

兩種敷設(shè)埋設(shè)深度思索不同要素。

Consider the different elements of two laying depths.

(1)當(dāng)必定選用有補(bǔ)償直埋敷設(shè)辦法時(shí)，埋設(shè)深度只思索由于空中荷載的效果不會(huì)毀壞管道的安穩(wěn)便可，從經(jīng)濟(jì)、施工便利等方面思索。中選用有補(bǔ)償直埋敷設(shè)辦法時(shí)，盡量淺埋，普通覆土厚度大于0.6米即可，且與管徑巨細(xì)無關(guān)。

(1) When the direct burial method with compensation must be selected, the burial depth only considers that the effect of air load will not destroy the stability of the pipeline, and considers from the aspects of economy and construction convenience. In the case of direct burial with compensation, shallow burial should be used as far as possible. The thickness of common overlying soil is more than 0.6 meters, and it has nothing to do with the diameter.

(2)中選用無補(bǔ)償直埋敷設(shè)辦法時(shí)，埋設(shè)深度要思索管道的安穩(wěn)央求，安穩(wěn)性主要與覆土厚度有關(guān)，普通比有補(bǔ)償埋得深，中選用不預(yù)熱的無補(bǔ)償直埋敷設(shè)管道時(shí)，小覆土深度應(yīng)按《城市熱網(wǎng)規(guī)劃規(guī)范》(CJJ34—90)第7.2.15條實(shí)行，覆土厚度應(yīng)與管徑巨細(xì)成正比。

(2) When choosing the non-compensated direct burial method, the burial depth should consider the stability requirement of the pipeline. The stability is mainly related to the thickness of the overlying soil, which is generally deeper than that with compensation. When choosing the non-preheated direct buried pipeline without compensation, the minimum depth of the overlying soil should be implemented in accordance with Article 7.2.15 of the Code for Urban Heat Network Planning (CJJ34-90), and the thickness of the overlying soil should be proportional to the diameter of the pipeline.

規(guī)劃中究竟選用無補(bǔ)償敷設(shè)仍是有補(bǔ)償敷設(shè)辦法，繩尺是直管道較長(zhǎng)，中心分支較少，供熱介質(zhì)不逾越100℃時(shí)，我國(guó)供熱信息網(wǎng)了解到應(yīng)優(yōu)先選用無補(bǔ)償敷設(shè)辦法，不然，應(yīng)思索有補(bǔ)償敷設(shè)辦法。細(xì)致的熱網(wǎng)主干線應(yīng)選用無補(bǔ)償敷設(shè)辦法，而分支院子管網(wǎng)則應(yīng)選用有補(bǔ)償敷設(shè)辦法，但如今有的規(guī)劃者偏心有補(bǔ)償敷設(shè)，應(yīng)建議優(yōu)化規(guī)劃。熱熔聯(lián)接

In the planning, there are still compensatory laying methods. The length of the straight pipe is longer, the central branch is less, and the heating medium does not exceed 100 C. The heating information network of our country knows that the non-compensatory laying method should be preferred. Otherwise, the compensation laying method should be considered. Detailed heat network trunk line should be laid without compensation, while branch yard pipeline network should be laid with compensation, but now some planners have eccentricity and compensation, should recommend optimal planning. Hot melt connection

熱熔聯(lián)接在聚乙烯管道聯(lián)接中是一種長(zhǎng)見的聯(lián)接辦法，也是為經(jīng)濟(jì)可靠的一種辦法。熱熔聯(lián)接普通有以下幾種，熱熔對(duì)接、熱熔鞍形對(duì)接、熱熔承插聯(lián)接。

Hot melt bonding is a long-standing method in polyethylene pipeline connection, and it is also the most economical and reliable method. Hot-melt joints generally have the following kinds: hot-melt butt, hot-melt saddle butt and hot-melt socket joint.

大口徑黑夾克

Large caliber black jacket

1、熱熔對(duì)接

1. Hot-melt docking

熱熔對(duì)接是在必定的壓力、時(shí)辰和溫度條件下，焊接端面被加熱到焊接溫度，然后彼此聯(lián)接的辦法。但是在聚乙烯管熱熔對(duì)接進(jìn)程中，易受環(huán)境及人為要素的影響。

Hot-melt butting is a method in which the welding ends are heated to the welding temperature under certain pressure, time and temperature, and then joined to each other. However, in the process of polyethylene pipe hot melt docking, it is vulnerable to environmental and human factors.

2、熱熔鞍形對(duì)接

2. Hot-melt saddle docking

熱熔鞍形對(duì)接聯(lián)接進(jìn)程比較艱難普通都在工廠預(yù)制。

Hot-melt saddle butt connection process is more difficult, usually prefabricated in the factory.

3、熱熔承插聯(lián)接

3. Hot-melt socket connection

熱熔承插聯(lián)接在《燃?xì)庥寐竦鼐垡蚁┕芗芬?guī)范中已不選用，在給水管道中運(yùn)用口徑都很小，大口徑熱熔承插聯(lián)接施工中，因管子重、對(duì)口與刺進(jìn)深度艱難，無法確保聯(lián)接質(zhì)量。

Hot-melt socket connection has not been selected in the code of Buried Polyethylene Pipe Fittings for Gas Use. In the construction of large-caliber hot-melt socket connection, the quality of connection can not be guaranteed because of the heavy pipe, the difficulty of counterpart and penetration depth.