300mm Inspection Chamber Specification

The inspection well is used in the building area (residential area, public building area, factory area, etc.) to buried plastic drainage pipes with an outer diameter of no more than 800mm and a buried depth of no more than 6m. Or slope changes, water drops, etc., for the convenience of regular inspection, cleaning and dredging, or well-shaped structures made of plastic injection molding or bricks for downhole operation and inspection. Before, a customer asked about the 300mm inspection chamber specification. For the convenience of the customer's reference, the author puts all the inspection chamber specification at the end of the article. Customers who need to customize the inspection chamber are welcome to leave us a message. By the way, I would like to introduce to you the formation and prevention of diseases around urban road inspection wells. Customers who need to order inspection chambers can refer to the content of this article. For more inquiries, please leave us a message.

Formation and prevention of diseases around 300mm inspection chamber of urban roads

Due to the particularity of laying various pipelines on urban roads, the complexity of its foundation treatment is determined. With the development of society and the acceleration of urbanization, the weakest link of urban roads—the road surface settlement and damage around various pipeline inspection chamber has become the main reason for affecting road functions and reducing service life. roads, and even traffic safety hazards. Combined with many years of urban road construction practice, the author discusses the causes and prevention of diseases around the 300mm inspection chamber of urban roads with colleagues. In recent years, with the rapid growth of traffic volume, the road surface around the 300mm inspection chamber of urban roads has become increasingly damaged and difficult to maintain. The main reasons for the settlement and damage of the road surface around the 300mm inspection chamber are:

a design. When designing various pipeline inspection manholes, the strength requirements of bricks and mortar used as manhole construction materials are generally determined according to the pressure they bear. Considering the convenience of dredging and maintenance of the pipeline, the inner diameter of the manhole is determined according to the design standard, and the relationship between the 300mm inspection chamber and the pipeline, and the transition between the top surface of the masonry manhole and the joint of the manhole cover are rarely considered. After driving for a long time, the manhole cover, the manhole body and the cement or asphalt concrete pavement around the manhole will vibrate and separate. Only referring to the standard diagram, the shaft wall bearing capacity is far from meeting the road supporting requirements. In addition, due to economic reasons, rainwater pipes are often designed with low rainfall intensity, the daily discharge of sewage pipes is too small for the water volume standard, the design diameter of rainwater pipes and sewage pipes is too small, and the design fullness requirement is 75% to 85%. The 300mm inspection chamber often overflows in the event of a once-in-a-decade rainstorm or pipe blockage. Because the design does not fully consider the anti-overflow, the 300mm inspection chamber leaks outward and gets wet.

The second is construction.

Generally, it is only bricklaying, plastering and jointing, without any anti-seepage measures. When backfilling around the manhole, due to the small construction area, it is too laborious to use manual tamping, and it is impossible to turn over with electric tamping. In addition to the work of migrant workers, in order to make money, the construction personnel will bypass this part if they do not pay attention to it. Hidden danger. Shortly after being put into use, it will cause the surrounding manhole to collapse and the pavement to break. And it is quite difficult to maintain.

The third is management.

Rain and sewage pipes have been used for a long time, and regular inspection, dredging, and maintenance cannot be performed, and the quality of residents in small cities is low. Coupled with imperfect facilities, garbage often flows into the pipeline and accumulates for a long time, which increases the load on the pipeline and causes sewage to overflow frequently. Pass through the workbench until the pipeline is blocked, and the sewage in the 300mm inspection chamber overflows and flows out from time to time, causing good foundations and even roadbeds to be soaked, causing road diseases. In short, due to the design lag, maintenance can not keep up, long-term use, the 300mm inspection chamber on the road leaks, seepage, and the backfill density around the manhole cannot be reached. Over time, the road around the 300mm inspection chamber will gradually sink and break. In order to avoid the occurrence of this disease as much as possible, the author recommends prevention and treatment from the following aspects:

Firstly, the design should be ahead of schedule, and the inspection manhole should be properly raised according to the trend of people's living standard improvement.

The design criteria of:

1. To improve the anti-seepage requirements of the 300mm inspection chamber, consider plastering the inside and outside of the masonry of the 300mm inspection chamber;

2. To improve the strength of the brick masonry, if necessary, consider using concrete blocks instead of bricks or pouring concrete at 50-80cm close to the road surface to solve the problem that the pressure on the manhole wall is greater than the road load;

3. Put forward special requirements for backfilling around the manhole.

The second is to conscientiously follow the technical operation regulations for construction, and regard the construction of the 300mm inspection chamber as an important part of quality control, and strictly require it. The backfill material around the manhole is preferably backfilled with lime soil. The backfill part is 120cm deep from the road surface, and the outer wall of the manhole is 100cm outward and the pipe trench is backfilled in layers at the same time. In addition, according to the actual local geological conditions, it is generally pebble soil. When backfilling pipe trenches in some road sections, local materials are used to backfill around the manhole with pebble white mortar masonry. It has strong impact resistance and can effectively prevent the subsidence of the road surface. So far, the road surface around the manhole has not experienced any subsidence or brokenness.

The third is to strengthen management, regular inspection and maintenance, and timely dredging of sediments. As long as the design is scientific, the construction is standardized, and the management is in place, the disease of road surface subsidence and damage around the 300mm inspection chamber will be effectively cured.