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Manholes

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Submitted By kenei
Words 1894
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Manholes:
Manhole is an opening constructed on the alignment of the sewer for facilitating a person access to the sewer for the purpose of purpose of inspection, testing, cleaning & removal of obstruction from the sewer line.

Object:
The following are the objects of the construction of manholes * They permit inspection, cleaning, maintenance of sewer line. The obstructions in the sewage flow are collected in manholes and then they brought to the surface. * The manholes allow the joining the sewers or changing the direction or alignment or both. * A manhole sometimes receives the contribution of sewage from sewers of various sizes and coming from various directions. * If manholes covers are perforated, the manholes may allow the escape of undesirable gases and thus, ventilation of sewers can be achieved. * The manholes facilitate the laying of sewers lines in convenient lengths.
Location:
Manholes should be built at every change of alignment, gradient and diameter. At the head of all sewers and branches and at every junction of two or more sewers. On sewers which are to be cleaned manually which cannot be entered for cleaning or inspection, the maximum distance between the two manholes should be 30 meters.
Constructional details:
The manholes are constructed directly over the centre line of the sewer. They are circular & rectangular in shape. Manholes should be of such size as will allow necessary cleaning & inspection of manholes.
Rectangular manholes:
These are the manholes of sizes like. 1) For the depth of manholes less than 0.90mtr, 900x800mm. 2) For the depth of manholes 0.90 up to 2.5 meter, 1200x900mm.

Rectangular manhole cover

Arch type manhole:
For the depth of 2.5 & above arch type of manhole can be provided and the internal sizes of chambers between brick faces shall be 1400x900mm.the width of manhole chamber on bends and junction of pipes with dia. greater than 450mm, should be suitably increased to 900mm or more so that benching width on either side of channel is at least 200mm. Circular manholes:
The circular manholes may be constructed as a alternative to rectangular as well as arch type manholes. These are the manholes are provided for all the depth starting from 0.90 m. circular manholes are straight down in lower portion and slanting in top portion so as to narrow down the top opening equal to dia. of manhole cover. Depending upon the depth of manhole the diameter of manhole changes. The internal diameter of circular manholes may be kept as following depths. * For depth above 0.90m and up to 1.65m, 900mm diameter. * For depth above 1.65m and up to 2.30m, 1200mm diameter. * For depth above 2.30m and up to 9.0m, 1500mm diameter. * For depth above 9m and up to 14m, 1800mm diameter.

Circular manhole cover
If the sewers are constructed in tunnel the manhole should be located at the access of working shafts and the manhole chamber must be constructed of a size to suit the working shaft or vice-versa.
The openings for entry into the manhole (without cover) should be of such minimum dimensions as to allow workman with cleaning equipments to access into the manhole without any difficulty. A circular opening is generally preferred. A minimum clear opening of 60cm is recommended. Suitable steps usually of cast iron shall be provided at entry.
Covers & frames:
The size of manhole covers should be such that there should be clear opening of not less than 560mm dia. for manholes exceeding 0.90m depth.
The frames of manhole shall be firmly embedded to correct alignment and level in plain concrete on the top of masonry. After completion of work the manhole cover should be sealed with grease.
Types of manhole:
Straight-Through manholes:
The simplest type of manhole is that built on straight run of sewer with no side junctions. Where there is change in the size of sewer, the soffit or crown level of the two sewers should be the same, except where special conditions require otherwise.
Junction manholes:
A manhole should be built at every junction of two or more sewers and the curved portions of the inverts of tributary sewers should be formed within the manhole. To achieve this with the best economy of the space, the chamber may be built of shape other than rectangular. The soffit of the smaller sewer at a junction should be not lower than that of the larger sewer in order to avoid the surcharging of the former when the latter is running full.

Side entrance manhole:
In larger sewers or where it is difficult to obtain direct access to the sewers from ground level, owing to existing service, gas, water etc. the success shaft should be constructed in the nearest convenient position off line of sewer and connected to the manhole chamber by a lateral passage.
House drainage:
Gully traps:
A gully trap is usually made of stoneware and cast-iron grating is provided at its top. The gully trap is provided inside a masonry chamber. A water seal about 60 to 70mm is provided in gully trap. The gully traps forms the starting point of horizontal flow of sewage. It is usually situated near the external face of the wall and kept slightly higher or even in line with ground level. The gully trap leads the sewage either to the sewer or to inspection chamber or to manhole.
A well designed gully trap may serve two or three connections from the nahani trap. But it is advisable to provide separate gully trap for sullage and soil waste. The top of the gully trap is provided with a cover cast iron which can be taken out easily for cleaning purpose.

Gully trap

Inspection chamber: The trap has a water seal of about 100mm and it is provided in the last manhole house drainage system. It thus conveys sewage from house to the public sewer. The main idea of providing the intercepting sewer trap is to prevent the entry of sewer gases from public sewer line to house drainage.
Hazards of manhole work:
The element of the sewer maintenance ignored very often and which requires careful attention and protective measures is the manhole work. The staff should be trained for comparatively easy act of removing a manhole cover, not only to avoid smeshed toes and fingers, but also to prevent more serious back injuries. In addition, the approaching drivers on the road should be warned from a distance about the manhole work in progress by the installation of suitable signals or lights.
The most serious hazard of manhole work are however flammable gas and oxygen deficiency. The staff should be thoroughly trained to carry out simple tests on every manhole before entry for oxygen deficiency, combustible, carbon monoxide or hydrogen sulphide.
If however an emergency demands to enter a gas-filled manhole or one where oxygen may be lacking, the worker should wear a self contained air breathing mask and a safety harness with lifetime. The extra two other employees should be stationed at the manhole opening because one individual cannot life an unconscious person out of a manhole.
Manhole safety: * Use safety harness & life line before entering into the sewer line. The two persons should stand at the top and they should give the signals to the person in manholes. * Test for the hazardous gases before entering into the manhole. * The manhole should be opened before one hour of the work. The care should be taken that it should be fenced to prevent any person, children in to the manholes. The dummy covers should be provided. * Use the mask when man has to into the sewer line. * No material should be kept near to the manhole as it can fall into the manhole which causes the accident. * Test the ladders of manhole before entering into the manholes. * The lighting material should be fire proof. * Lower all the tools into the manhole through buckets only.

Drop manhole:
When a sewer connects with another sewer, where the difference in level between water lines of main line and the invert level of branch line is more than 600mm or a drop of more than 600mm is required to be given in the same sewer line and it is uneconomical and impracticable to arrange the connection with in 600mm, a drop connection shall be provided for which a manhole may be built incorporating a vertical or near vertical drop pipe from the higher sewer to lower sewer. This pipe may be outside the shaft and encased in concrete or supported on brackets inside the shafts which should be suitably enlarged. If the drop pipe is outside the shaft the continuation of sewers should be built through the shaft wall to form a rodding and inspection eye. This should be provided with a half blank flange. If the drop pipe is inside the shaft, it should be in cast iron and it would be advantageous to provide adequate means for rodding and water cushion of 150mm depth should also be provided. The diameter of the back drop should be at least as large as that of incoming pipe
The drop pipe should terminate at its lower end with a plain or duck foot turned so as to discharge its flow at 45 degrees or less to the direction of the flow in main sewer and the pipe unless of cast iron, should be surrounded with 150mm of concrete.
In case of sewers over 450mm in diameter the drop in level may be accomplished by one of the following methods- a) A cascade:
This is a steep ramp composed of steps over which the flow is broken up and retarded. A pipe connecting the two levels is often concreted under the steps to allow small flows to pass without trickling over the steps. The cascade steps may be made of heavy duty bricks of class I quality cement concrete with granolithic finish or dressed granite. b) A ramp:
A ramp may be formed by increasing the grade of the last length of the upper sewer to about 45 degree or by constructing a steeply graded channel or culvert leading from the high level to the low level. In order to break up the flow down the ramp and minimize the turbulence in the main sewer. The floor of culvert ramp should be obstructed by raised transverse ribs of either brick or concrete at 1.15 m intervals and a stilling pool provided at the bottom of the ramp.

c) By drops in previous successive manholes :
Instead of providing the total drop required at the junction manhole, the same may be achieved by giving smaller drops in successive manholes preceding the junction manhole. Thus, for example, if a total drop of 2.4 m is required to be given, 0.6 m drop may be given in each of the previous three manholes and the last 0.6m may be given at the junction.
Scrapper or service type manholes-
All sewers above 450mm in diameter should have one manhole at intervals of 110 to 120 m of scrapper type. The manhole should have clear opening of 1200 x 900mm at the top to facilitate lowering of buckets.

References:
1.http://www.indiawaterportal.org/sites/indiawaterportal.org/files/Manual%20on%20sewage%20and%20sewerage%20treatment_CPHEEO_MoUD_%201993.pdf.

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