What are the definitions of reserved holes and reserved holes in buildings? What is the connection and difference?

There is no difference between the two.

The reserved hole refers to the reserved hole, both of which have the same definition. The reserved hole refers to the hole reserved by the building main body for burying water supply, heating and other facilities and pipelines during construction. In the installation of some large machinery, the reserved holes on the foundation also play an important role.

Generally, the reasons for the high or low foundation of reserved holes are mainly caused by design errors, and often the secondary grouting layer of equipment foundation is not left, which leads to the failure of normal installation of equipment; Of course, there are also many cases that are caused by failure to control during construction.

Because the hole is too deep to be modified, we can only find ways to remedy it during equipment installation. But many times, due to various reasons, the installation and construction personnel only take perfunctory treatment methods, and because they are not caused by their own reasons, they often simply deal with things, which is very difficult for quality control afterwards, and also leaves some hidden dangers for the safe and stable operation of equipment in the future.

Extended data:

Precautions for reserved holes (i.e. reserved holes):

1, insufficient hole depth:

Due to design errors and construction failures, the drilling depth is not enough. Design mistakes are usually not easy to find, and they usually forget to consider leaving a size for secondary grouting or not designing according to the size provided by the manufacturer;

In addition, due to careless operation during construction, concrete is directly poured into the mold from the upper opening, or the mold is damaged due to vibration, which causes concrete to enter the reserved cavity, making the hole shallow and unable to put the anchor bolt normally.

2, reaming die:

In this case, in the process of civil foundation construction, due to the insufficient strength of the mold buried in the cavity or the vibration damage during pouring, concrete squeezed the mold into the middle, which caused the foundation cavity to shrink inward, and the deformation degree of shrinkage far exceeded the elbow diameter of the anchor bolt, which led to the failure to put the anchor bolt in.

This kind of mold is generally made of welded steel bars, and then two layers are surrounded by fine steel mesh. However, due to the depth of the cavity of about 2m, there are few steel bars in the middle of the steel bars, and the strength is insufficient. Or because the vibrating rod was rammed directly on the mold when the operator poured concrete, and the steel wire mesh was smashed, so that the concrete entered the mold, resulting in a shallow hole and the anchor bolt could not be put in.

3. Up and down deflection of foundation hole:

In the process of construction, the reserved hole mould is not fixed firmly, and the concrete is impacted when pouring concrete, and the embedded mould is seriously deviated, which leads to the hole leaning to one side. In most cases, the upper hole deviation is small, the lower hole deviation is large, and the foundation construction quality is unqualified, which leads to the failure to place the equipment anchor bolts.

Because the length of the mold is generally about 2m, no matter what kind of mold is not reliably fixed, or it is not carefully operated during construction, it may lead to the deviation of the mold, which may lead to unqualified holes and the failure to put the anchor bolts normally.

4. Wrong hole position:

If the design and construction control are not good, the reserved holes will make mistakes, which will lead to the failure of normal installation of the equipment.

Baidu encyclopedia-reserved hole

Baidu encyclopedia-reserved hole