Improvements relating to Sewer Manholes and Chambers, Ventilating and other Shafts, and the like.
Year: 1891

page_text: Date of Application, 24th July, 1891
Complete Specification Left, 27th Jan., 1892-Accepted, 5th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements relating to Sewer Manholes and Chambers, Ventilating
and other Shafts, and the like.
I, WALTER CLIFFORD TYNDALE, of the Horse Guards, Whitehall, in the
County of London, Associate Member of the Institution of Civil Engineers, do
hereby declare the nature of this invention to be as follows:-
My invention relates to sewer manholes and chambers, ventilating and other
shafts and the like.
The main object of my said invention is to facilitate the construction and reduce
the cost of manholes and chambers on sewers or drains. My said invention is,
however, also applicable to shafts on subways, ventilating-shafts, wells, and to shafts
for other purposes.
In making a shaft, manhole or chamber according to my present invention, I
proceed as follows, that is to say :-I first form, by moulding in any convenient
manner, rings or annular or tubular pieces of rock-concrete, stoneware, fireclay or
similar material, of suitable shape and size, adapted to fit one upon another; and
I place these rings or annular or tubular pieces one above another until a shaft of
the required depth or height is thus produced. I so form the ends of the said rings
or annular pieces that an annular projection on the end of one ring will fit into a
corresponding socket or recess in the adjacent ring, thus facilitating the formation
of a water-tight joint.
I make the said rings or tubular pieces of circular, oval or other suitable shape
according to the purpose for which they are required. And, in cases where the
shaft is to be of varying diameter, I connect the parts of different diameter by
means of reducing rings or tubes, that is to say, rings or tubes which are of the
larger diameter at one end and of the smaller diameter at the other end.
When steps are required in the shaft, I find it advantageous to provide suitable
step-irons which are so constructed that parts of the same can be inserted in slots
in the end of one ring so that they are held in place by the adjacent ring, and
other parts of the said step-irons will then bear against the interior of the shaft.
The said slots may then be filled up with cement or similar material.
I prefer to make the aforesaid rings or tubes of rock-concrete, in which case the
interior of the shaft remains clean and white.
It is evident that a shaft can be constructed in accordance with my said invention
at a much lower cost and in much less time than the brickwork shafts hitherto
generally used. Moreover my improved shafts can be easily constructed in " water-
logged "land, or under water if necessary.
Dated this 24th dex of Inly 1801
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
0
COMPLETE SPECIFICATION.
Improvements relating to Sewer Manholes and Chambers, Ventilating
and other Shafts, and the like.
I, WALTER CLIFFORD TYNDALE, of The Horse Guards, Whitehall, in the
County of London, Associate Member of the Institution of Civil Engineers, do
hereby declare the nature of this invention and in what manner the same is to
[Price 8d1

page_text: be performed to be particularly described and ascertained in and by the following
statement:-
My invention relates to sewer manholes and chambers, ventilating and other shafts,
and the like.
The chief object of my invention is to facilitate the construction of manholes and
chambers in sewers or drains and to reduce the cost thereof.
My said invention is also applicable to ventilating shafts and to shafts for sub-
ways, wells, and the like.
In carrying my said invention into practice, I proceed as follows, that is to say
I first form by moulding or in any other convenient manner, rings or tubular
pieces of rock-concrete, stoneware or similar material, or metal. I make the said
rings of any suitable shape and size depending on the purpose for which the shaft
is to be used, and I form them at the ends so that an annular projection on the end
of one ring will fit into a corresponding socket or recess in the end of the next ring
to facilitate the making of a good water tight joint.
In the accompanying drawings,
Figure 1 is a vertical central section of a sewer manhole constructed according
to my invention in rock concrete.
Figure 2 is a transverse section of the same.
Figure 3 shows a slightly modified form of ring.
The several rings or annular sections of the shaft are shown at A. One end of
each of the said rings is made with a projecting lip B which fits into a corresponding
recess C in the end of the section or ring adjacent to it. Suitable cement is
preferably used to make the joint water-tight the jointing material being especially
needed when the rings are made of metal or stoneware.
Where it is necessary to narrow or widen the shaft I use a section of tube which
is narrower or wider at the bottom than at the top as at A¹. When steps are
required in the shaft, I use suitable step-irons which may be inserted in slots in the
end of one ring and held in place by the adjacent ring, or I may use horse shoe
shaped irons inserted in slots in the side of the shaft and secured by cement
suited to the material of which the rings are formed. Such step-irons are shewn
at D.
Shafts or manholes constructed according to my invention can be built in much
less time and at a lower cost than is the case with ordinary brickwork shafts and
the said manhole or shaft will be absolutely water-tight without the use of any
cement coating on the inside.
My improved shafts can be easily sunk in “water-logged" land or even under
water if necessary.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A shaft for a manhole or the like constructed of a series of rings or annular
sections made of rock concrete, stoneware or the like, or metal placed one upon
another, one end of each of the said rings or annular sections being furnished with
a projecting lip or otherwise shaped in such a manner as to fit a corresponding
recess or socket in the adjacent end of the next section so as to facilitate the forming
of aton tight inint substantially donosibed
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.