How should the clear width of a residential entrance door be calculated? The response to this controversial point comes

The pictures are all data pictures

Different people The net width of the entrance door has different understandings. Some people think it is the width of the door opening before the door is installed; some people think it is the width between the door frames after the door is installed (as shown on the left); others think it is the width of the human body after the door is opened (such as right picture).

□Dahe News·Dahe Client Reporter Cai Junyan

On October 29, Dahe News·Dahe Client published the article \”Does the net width of the entrance door include the thickness of the door frame and door panel?\” The title of \”Lawsuit between Owners and Developers\” was reported on the case of a resident in Zhongmou County suing the developer due to the clear width of the entrance door. This caused a stir and made some people in the construction circle feel uneasy, and also made some people in the construction industry feel uneasy. Some citizens are confused because the focus of the dispute between the two parties in the lawsuit is \”the net width of the entrance door should not be less than 0.9 meters.\” Does it refer to the width of the door opening before the door is installed, or the passing width after the door is installed, excluding the door frame and door panel? Many people are confused.

The reporter learned that this is due to the inconsistency between the national standards for door width in the \”Residential Design Code\” and the \”Building Design Fire Protection Code\”, and after the partial revision of the \”Building Design Fire Protection Code\”, the The meaning of \”clear width\” was unclear and the measurement method shown in the corresponding diagram was adjusted, which led to some complaints and even lawsuits. Industry insiders said that in response to this focus issue, they are actively reporting it to higher-level departments and working hard to resolve conflicts. In the next step, the net width of the entrance door will also have a tendency to be adjusted. In the 2019 draft for partial revision of the \”Code for Fire Protection Design of Buildings\”, it is planned to adjust the net width of the entrance door to 0.8 meters, and it is emphasized that this adjustment will not essentially affect the evacuation safety of personnel and the need for firefighters to carry equipment on their backs.

Confused about what is the standard for the clear width of an entrance door?

\”Entry doorHow should the net width be calculated? We also want to find out, otherwise we will feel unsure. \”Not long ago, Ms. Yang, the owner of a community in Zhongmou County, took the developer to court on the grounds that the width of the entrance door of her home was only 0.82 meters and did not meet national standards. It aroused a lot of attention, and everyone wanted to make a decision. Understood.

In this prosecution case, the owner believed that the clear width of the entrance door refers to the narrowest distance when the human body passes through the entrance door, that is, the clear width of the entrance door. However, the developer’s entrusted agent believes that based on the illustrations of the \”Building Design Fire Protection Code\”, it can be seen that the net width of the entrance door of a residential building is marked with the width of the door opening, which is 1.06 meters. When installing the door frame and The width of the entrance door behind the door panel is also 0.96 meters, which is also in compliance with relevant regulations… Both parties have different opinions.

In a construction company. Mr. Wang, who has worked for many years, told reporters that the reason for the dispute between the two parties is related to the mandatory provisions in the partially revised version of the \”Code for Fire Protection Design of Buildings\” that came into effect on October 1, 2018, which clearly states: \”Residential buildings The respective total clear widths of doors, safety exits, evacuation walkways and evacuation stairs should be calculated and determined, and the clear widths of doors and safety exits should be calculated and determined. The width should not be less than 0.9 meters, and the clear width of evacuation walkways, evacuation stairs and first-floor evacuation exterior doors should not be less than 1.1 meters…\” But what exactly does the clear width refer to? There is no clear and clear explanation in the specification, so that Disputes arise.

The problem is due to different requirements and the adjustment of the standard illustration.

In terms of the clear width of the entrance door, it is Why is there a dispute?

It is understood that on the one hand, the requirements for the width of the entrance door in the \”Residential Design Code\” and the \”Architectural Design Fire Protection Code\” are inconsistent, and on the other hand, it is also inconsistent with the \”Architectural Design Fire Protection Code\” The \”Residential Design Code\” implemented on August 1, 2012 is related to the adjustment of the illustrations before and after the partial revision of the Code. The minimum door opening width is 1 meter, but it does not involve issues such as the thickness of the door installed later.

The \”Building Design Fire Protection Code\” will be implemented on May 1, 2015 and October 1, 2018. The 2018 partially revised version of the \”Code for Fire Protection Design of Buildings\” that was implemented in 2018 has the same regulations on the clear width of the entrance door. However, the meaning of \”clear width\” is not clear. The description is not clear, but it has been supplemented in the corresponding illustrations of the \”Code for Fire Protection Design of Buildings\”

Industry insiders said that the illustrations of the \”Code for Fire Protection Design of Buildings\” have also been adjusted on September 1, 2014. , the illustrations of the \”Building Design Fire Protection Code\” implemented successively on June 1, 2015 are consistent with the illustrations of the entrance door. The width of the entrance door is the width of the door opening. However, the \”Building Design Fire Protection Code\” implemented on November 1, 2018 strengthens the width of the entrance door, clearly stating that the net width of the entrance door is not less than 0.9 meters, by adding the \”Schematic diagram of the net width of the evacuation door\” The method of enlarging the detailed drawing redefines the clear width calculation method, \”It can be seen from the enlarging detailed drawing that the clear width is the traffic width after the door is installed. \”Industry insiders said that due to the adjustment of the icon, the increase inProblems such as mismatch in design, construction and product standards have resulted in the clear width of some entrance doors being less than 0.9 meters.

Solution

Differential treatment for design and construction acceptance at different times

Industry insiders said that the partial revision of the \”Building Design Fire Protection Code\” and the adjustment of illustrations will bring Project design, construction, acceptance and other issues should be treated differently to prevent and control risks.

For projects that have not yet started, especially projects with a reserved door opening width of 1 meter

It is recommended that the design unit recalculate the width of the reserved opening, or remind the entrance door manufacturer in the future On the premise of ensuring quality, pay attention to the size of the door frame and ensure the net width of the entrance door; for the main construction phase of the project, if the reserved door opening width is 1.0 meters, it is recommended that the design institute review whether the reserved opening can be expanded, or adopt a method that meets the requirements Clear width requirements for entry doors.

For a completed project, if the measured width of the entrance door is less than 0.9 meters, it is recommended to conduct a detailed analysis of specific problems based on the measured width on site

The width error of the entrance door should be within 5% ( Net width is greater than 0.855 meters and less than 0.9 meters): According to Article 20 of the Ministry of Housing and Urban-Rural Development’s \”Regulations on Fire Protection Design Review and Acceptance of Construction Projects\”, the error does not exceed 5%, and it can be determined without affecting normal use functions and fire safety. To be qualified.

The net width of the entrance door is greater than or equal to 0.8 meters and less than 0.855 meters:

You can check the time when the \”Construction Engineering Fire Design Review Opinion\” was passed. If it was in 2018 Approval must be passed before November 1, 2019 (Illustration of \”Code for Fire Protection Design of Buildings\”, Atlas No. 18J811-1, date of approval), According to Article 40 of Order No. 51 of the Ministry of Housing and Urban-Rural Development, \”Before the implementation of the newly promulgated national fire protection technical standards for engineering construction, if the fire protection design of the construction project has been reviewed and qualified in accordance with the law, it shall be implemented according to the standards of the original review opinion\”, and it will be determined to be qualified; otherwise, it will be determined to be qualified. It is unqualified (note: 0.8 meters is based on the latest partial revision of the \”Building Design Fire Protection Code\”).

The net width of the entrance door is less than 0.8 meters:

It is judged as unqualified and the entrance door needs to be replaced.

Of course, the judgment of the above-mentioned qualified conclusion when it is less than 0.9 meters should be made by the construction unit to review the project design review time and the standards and specifications adopted.

Industry insiders said that as fire protection acceptance inspection becomes more and more strict, such conflicts accumulated in the early stage will gradually be resolved.