450mm Plastic Inspection Chamber in Drainage System in Indonesia

The plastic inspection chamber is an indispensable structure in municipal engineering, and some problems will inevitably occur during use, so this article will analyze the problems and prevention measures of the inspection chamber in drainage system during the construction process. I hope this article will be helpful for using 450mm inspection chamber in drainage system in Indonesia.

Problems Existing in Plastic Inspection Chamber Construction Process and Prevention Measures

1. Situation overview

Although the 450mm inspection chamber is an auxiliary structure in municipal engineering, it has a decisive impact on road engineering and drainage engineering. The cement concrete pavement, especially around the 450mm inspection chamber, is subjected to vehicles driving, and bears more impact force, and is often the first to be damaged, which can easily cause the vehicle to jump, affecting the comfort and safety of driving, and also affecting the chamber circle and chamber wall. The connection affects the firmness and stability of the chamber and the chamber ring on the plastic inspection chamber, and makes it easy for the soil and debris on the ground to fall into the 450mm inspection chamber. Therefore, this will result in the safety and comfort of pedestrians, vehicles and other activities on the ground, as chamber as the pipeline. Drainage is difficult to function properly. The author has carefully observed the urban road surfaces of large and medium cities such as Fuzhou, Xiamen, Wuhan, Shanghai, Guangzhou, Beijing, and Shenyang, and found that the above-mentioned problems exist to varying degrees, seriously affecting urban vehicle traffic, and even causing traffic accidents.

Inspection Chamber in Drainage System

2. Cause Analysis

According to the author's careful observation and analysis, there are mainly the following reasons for the above situation.

2.1. Check the installation of manhole covers and manhole rings. Under the action of various forces of the car, the pavement will produce different sizes of compressive stress, tensile stress and shear stress in its structure. If these forces exceed the overall structure of the pavement structure or the strength of a certain component, the pavement will suffer damage such as fracture, subsidence, waves and wear. If the manhole cover is installed too high or too low, the chamber frame and well seat are vulnerable to the large impact force of the vehicle, causing the vehicle to jump, and increasing the various stresses on the cement concrete slab around the chamber cover. When the value exceeds the strength of the concrete pavement , the part of the concrete pavement will be destroyed. First of all, cracks are generated at the corners of the boards that vehicles often pass by, and quickly develop into criss-cross cracks, and in severe cases, develop into broken cracks, and even fall off into potholes. Once potholes are formed, the water on the road surface will penetrate into the base layer, so that the humidity of the roadbed will increase, and its plastic deformation will continue to accumulate and increase. Excessive plastic deformation will cause the bottom of the slab to lose its support, and the rigidity, strength and stability of the road surface will be damaged, so that the concrete pavement will be further damaged, the pothole area will increase, and the well chamber will be subjected to greater impact force from the vehicle, making the well cover and well frame very vulnerable to damage, which may cause it to move and dislocate or the well cover will rupture, or the well chamber will be damaged. 

In this way, the soil and sundries on the ground can easily fall into the 450mm inspection chamber. Since the bottom of the 450mm inspection chamber is not checked and excavated for impurities frequently, excessive impurities are deposited in the launder, which makes it difficult for the drainage pipes to run normally, and even cause pipe blockage.

2.2. Backfill and roll around the well chamber of the inspection chamber in drainage system

Sometimes in order to catch up with the construction period, the backfill soil does not reach the optimum water content, which is very easy to cause the formation of spring soil or a sudden change in settlement, and because the road roller is limited by the 450mm inspection chamber on the ground, it is difficult to roll the fill soil close to the well chamber in place. Thus there is a "dead angle" of rolling. In this way, the density of the backfill soil around the well chamber cannot meet the construction specification requirements, which can easily cause uneven settlement or collapse of the backfill soil around the 450mm inspection chamber, which will affect the cracks or collapse of the cement concrete slab, resulting in damage to the pavement slab and pipeline drainage. , affecting its normal and usable functions.

2.3. Inspection well masonry and other processes caused. During the construction, due to poor management or the workers who built the 450mm inspection chambers did not have the technology of municipal engineering construction, and did not accept the education and disclosure of the construction technicians, the 450mm inspection chambers built in this way often did not meet the requirements of the construction specifications, and their integrity and firmness And the stability and appearance size are poor, especially the foundation of the 450mm inspection chamber is not constructed according to the specification requirements, which may lead to the collapse of the well chamber in severe cases, resulting in the collapse of the road surface and blockage of drainage.

Plastic Inspection Chamber in Stock

3. Prevention and control measures

1. Before installing the 450mm inspection chamber ring and the 450mm inspection chamber cover, the top surface of the 450mm inspection chamber wall should be washed clean with water, and the mortar should be spread to level the 450mm inspection chamber ring and the road surface, so as to ensure the tight connection between the 450mm inspection chamber ring and the 450mm inspection chamber wall and the firmness and stability of the 450mm inspection chamber ring on the 450mm inspection chamber wall of the inspection 450mm inspection chamber. stability. In order to ensure that the elevation of the manhole cover is consistent with the elevation of the road surface, the longitudinal and transverse slope cables can be used for leveling when the manhole cover is installed, so that it is consistent with the longitudinal and transverse slope of the concrete pavement. On roads with heavy traffic, heavy-duty manhole covers should also be installed to ensure the safety of pedestrians, vehicles and other operations on the ground, and also to ensure that debris on the ground is not easy to fall into the 450mm inspection chamber, so as to ensure that the drainage pipes are unimpeded. In order to prevent cracks at the corners of the cement concrete slab around the manhole cover, steel bars can be added to the cement concrete slab around the manhole cover, with a diameter of 10MM and a distance of 10 cm from the 450mm inspection chamber frame diagram.

2. After the inspection 450mm inspection chamber is built and the mortar is fully cured, it can be backfilled around the 450mm inspection chamber chamber. The backfill soil must reach the optimal water content, and then backfill compactly. The upper layer of the backfill must be filled with lime soil or sand with a thickness of 60 cm. If it cannot be dried in the rainy season, it shall be backfilled with lime soil or sand to ensure its compactness and sudden change in settlement. In order to catch up with the construction period, the filler should choose materials with high strength, fast compaction and good water permeability, such as pebbles, crushed stones, and medium-coarse sand. For the "dead corner" of rolling, dynamic compaction can be used to ensure that the compactness meets the design requirements.

3. In order to avoid defects such as the integrity, firmness, stability and appearance of the inspection 450mm inspection chamber due to unskilled workers, the on-site technicians must strengthen the technical disclosure and education of the workers so that they can master the correct masonry process and construction Process and realize the importance of installing manhole covers and 450mm inspection chamber rings in terms of structural quality and use functions, and at the same time pay clear quality standards and technical points. During the construction process, it is necessary to check carefully, and correct any problems immediately until they are qualified. The key is to manage in place, operate carefully, and be responsible.