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.

兩種敷設埋設深度思索不同要素。

Consider the different elements of two laying depths.

(1)當必定選用有補償直埋敷設辦法時，埋設深度只思索由于空中荷載的效果不會毀壞管道的安穩(wěn)便可，從經濟、施工便利等方面思索。中選用有補償直埋敷設辦法時，盡量淺埋，普通覆土厚度大于0.6米即可，且與管徑巨細無關。

(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)中選用無補償直埋敷設辦法時，埋設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，普通比有補償埋得深，中選用不預熱的無補償直埋敷設管道時，小覆土深度應按《城市熱網規(guī)劃規(guī)范》(CJJ34—90)第7.2.15條實行，覆土厚度應與管徑巨細成正比。

(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)劃中究竟選用無補償敷設仍是有補償敷設辦法，繩尺是直管道較長，中心分支較少，供熱介質不逾越100℃時，我國供熱信息網了解到應優(yōu)先選用無補償敷設辦法，不然，應思索有補償敷設辦法。細致的熱網主干線應選用無補償敷設辦法，而分支院子管網則應選用有補償敷設辦法，但如今有的規(guī)劃者偏心有補償敷設，應建議優(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)接中是一種長見的聯(lián)接辦法，也是為經濟可靠的一種辦法。熱熔聯(lián)接普通有以下幾種，熱熔對接、熱熔鞍形對接、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、熱熔對接

1. Hot-melt docking

熱熔對接是在必定的壓力、時辰和溫度條件下，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接進程中，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、熱熔鞍形對接

2. Hot-melt saddle docking

熱熔鞍形對接聯(lián)接進程比較艱難普通都在工廠預制。

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《燃氣用埋地聚乙烯管件》規(guī)范中已不選用，在給水管道中運用口徑都很小，大口徑熱熔承插聯(lián)接施工中，因管子重、對口與刺進深度艱難，無法確保聯(lián)接質量。

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.