Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
CA 02427846 2003-05-02 02838 (PCT/JPp2/07226)
MANHOLE STRUCTURE CONSTRUCTING METHOD,
MANHOLE STRUCTURE WATER-STOP FLEXIBLE JOINT A.~1D
MANHOLE STRUCTURE
Background of the Invention
Field of the Invention
[0001] The present invention relates to a method for constructing manhole
structures, waterproof flexible joints for such manhole structures and the
manhole structures thus constructed.
Related Art Statement
[0002] There are a digging/reburying construction method, a jacking con-
struction method, etc. as pipe-paving technique. According to the jacking
construction method, a starting vertical hole and an arrival vertical hole are
first
dug, and then a sewer pipe is pushed into horizontally from the start vertical
hole
by means of a jack, while a horizontal hole is being dug by a horizontal
boring
machine.
[0003] Fig. 4 is a vertical sectional view of a part of a conventional manhole
structure 41. As shown in Fig. 4, a manhole 42 is placed in a vertical hole.
In order to minimize working, a steep pipe is generally used as an earth-
retaining
wall when such a vertical hole is dug. In the construction of the manhole, a
steel casing pipe serves as an outer mold frame 44, and the manhole 42 is
formed
between the outer mold frame 44 and an inner mold frame 45.
[0004] When the manhole 42 is constructed within such a vertical hole, an end
portion of a pipe 43 such as sewer pipe, as previously placed, is buried in a
concrete wall 46 of the manhole as required from an installation space for the
manhole 42.
[0005] Further, as shown in Fig. 4, an interface 47 between the pipe 43 and
the concrete wall 46 of the manhole is likely to serve as a passage for
leaking
water. Under these circumstances, a sand-attached short pipe in which sand 48
is glued around an outer peripheral surface 43a of the pipe 43 is often used.
[0006] In the manhole structure 41 shown in Fig. 4, the concrete 46 is rigidly
joined to the pipe 43, so that there is the possibility that the pipe 43 may
be
broken on earthquake or the like. Particularly when the pipe 43 is a Hume pipe
-1-
CA 02427846 2003-05-02 02838 (PCT'/JP02/07226)
or porcelain pipe, it is likely to be broken on ground displacement.
[0007] When the pipe 3 is a flexible pipe such as a resin pipe, it is less
likely
to be broken by ground displacement, but there is still a high possibility
that it
may be broken. Further, the resin pipe is not bonded to the concrete, so that
a
water passage is formed when a sand-attached short pipe is not used. Thus, the
resin pipe has a problem in waterproof.
[0008] As shown in Fig. 4, in the case of the sand-attached short pipe, a fine
gap 49 or the like is formed under the pipe 43 due to the dewatering sink
before
curing of the concrete 43 or after drying shrinkage of the concrete 46 with
lapse
of years, thereby causing water leakage.
[0009] Since the flexible pipe such as the resin pipe is particularly
flexible, it
is likely to become flat due to ground pressure or the like, so that formation
of
water passage cannot be completely prevented even by using the sand-attached
short pipe.
[0010]
Summary of the Invention
It is an object of the present invention to form 'a soft connection of the
manhole structure through joining the manhole to the pipe with the water-proof
flexible joint, so that the pipe can be prevented from being broken on
earthquake
or the like.
Further, it is another object of the present invention to completely
prevent water leakage between the manhole and the pipe.
[0011] The present invention relates to a method for constructing a manhole
structure in which a manhole and a pipe are joined together, said method
comprising: preparing a waterproof flexible joint for the manhole structure,
said
waterproof flexible joint comprising a rigid cylindrical portion and a
cylindrical
flexible portion, said cylindrical flexible portion comprising a covering
portion to
be fixed around an outer periphery of said pipe, a fixing portion to be fixed
to
said manhole and a connecting portion connecting the covering portion to the
fixing portion, said fixing portion being fixed to an outer periphery of said
rigid
cylindrical portion, said connecting portion being made of an elastic material
being capable of absorbing a displacement between the manhole and the pipe;
locating the waterproof flexible joint around the outer periphery of the pipe;
-2-
CA 02427846 2003-05-02 02838 (PCT/JP02/07226)
fixing the covering portion around the outer periphery of the pipe; and
pouring a
filler for the manhole around an outer periphery of the fixing portion.
[0012) Further, the present invention relates to a waterproof flexible joint
for
the manhole structure to be used in the above construction method as well as
to
the manhole structure obtained by the above method.
[0013] The present invention is based on the knowledge that the manhole
structure in which the joint portion between the pipe in the jacking method
and
the concrete manhole cast on site is made as a soft connection can be obtained
by
using the specific waterproof flexible joint for the manhole structure.
[0014] According to the present invention, the manhole structure, which
comprises the manhole, the pipe and the waterproof flexible joint for the
manhole
structure, is constructed by fixing the waterproof flexible joint around the
outer
periphery of the pipe and then pouring the manhole filler around the joint.
[0015] The waterproof flexible joint according to the present invention
comprises the rigid cylindrical portion and the cylindrical flexible portion.
The rigid cylindrical portion is located on a radially outer side of the
cylindrical
flexible portion and serves to fix the cylindrical flexible portion to the
manhole.
[0016] The cylindrical flexible portion comprises the covering portion to be
fixed around the outer periphery of the pipe, the fixing portion to be fixed
to the
manhole, and a connecting portion connecting the covering portion to the
fixing
portion.
[0017] According to the present invention, the fixing portion of the
cylindrical
flexible portion is fixed to the outer periphery of the rigid cylindrical
portion.
The rigid cylindrical portion serves to fix the fixing portion of the
cylindrical
flexible portion to the manhole.
[0018] According to the present invention, the manhole structure can be
constructed by fixing the covering of the cylindrical flexible portion to the
outer
periphery of the pipe and pouring the manhole filler around the outer
periphery
of the fixing portion of the cylindrical flexible portion.
[0019] In the present invention, the filler for manhole (hereinafter referred
to
as "manhole filler") includes concrete to be poured into a mold frame for
constructing the wall of the manhole on site or a filler to be filled in a
space
between an inner face of a hole formed in the wall of an assembled manhole or
-3-
CA 02427846 2003-05-02 02838 (PCT/JP02/07226)
the like and the waterproof flexible joint for fixing the waterproof flexible
joint
to the face of the hole.
[0020] In the present invention, the connecting portion of the cylindrical
flexible portion is made of the elastic material capable of absorbing
displacement
between the manhole and the pipe. This connecting portion is located between
the manhole and the pipe, and serves to absorb the displacement between the
manhole and the pipe.
[0021] In the present invention, the rigid cylindrical portion supports the
fixing portion of the cylindrical flexible portion and fix the fixing portion
to the
manhole when the manhole filler is poured around the outer periphery of the
fixing portion of the cylindrical flexible portion.
[0022] In the present invention, the rigid cylindrical portion keeps a space
between the fixing portion and the covering portion of the cylindrical
flexible
portion, and the connecting portion of the cylindrical flexible portion
absorbs
displacement between the manhole and the pipe within this space.
[0023] According to the present invention, after the waterproof flexible joint
for manhole structure is fixed around the outer periphery of the pipe, the
manhole
filler is poured around the outer periphery of the waterproof flexible joint.
Thus,
the manhole structure having the manhole and the pipe joined together by the
soft
connection can be extremely effectively constructed.
These and other objects, features and effects of the invention will be
apparent upon reading the following description of the invention in
conjunction
with the attached drawings, with the understanding that any modifications,
variations and changes can be made to the invention by the skilled person in
the
art to which the invention pertains.
Brief Descr~tion of the Drawines
For a better understanding of the invention, reference is made to the
attached drawings, wherein:
Fig. 1 is a vertical sectional view of a part of one embodiment of the
manhole structure according to the present invention;
Fig. 2 is a perspective view of a waterproof flexible joint for the
manhole structure according to the present invention;
Fig. 3 is a vertical sectional view of a part of another embodiment of
-4-
CA 02427846 2003-05-02 02838 (PCT/JP02/07226)
the manhole structure according to the present invention; and
Fig. 4 is a vertical sectional view of a part of a conventional manhole
structure.
[0024]
Detailed Description of the Invention
The present invention will be explained below in more detail.
(1) Manhole
In the present invention, manholes made of concrete cast on site as
well as other manholes produced preliminarily in factories, such as make-up
assembling manholes, can be used as manholes.
[0025] In the case of the make-up assembling manhole, a hole for the
connection with the pipe may be formed in the wall of the manhole on site, but
the hole is preferably formed in a factory or the like having well controlled
quality management.
[0026] In the present invention, the manhole made of the concrete cast on
site can be formed by pouring the manhole filler in a mold frame on site of
the
vertical hole.
[0027]
(2) Pipe
In the present invention, the pipe is a pipe for connecting one
manhole to another manhole or the like. Typically, the pipe is a sewer pipe.
Such pipes can be placed between at least two vertical holes by the jacking
method.
[0028]
(3) Manhole filler
In the present invention, the manhole filler is used to construct the
manhole on site or fixing the waterproof flexible joint to the inner face of
the
hole of the make-up assembled manhole.
[0029] As such a manhole filler, concrete, mortar concrete or the like can be
used at various quality levels without particular limitations. If the space is
narrow between the outer periphery of the rigid cylindrical body and the inner
face of the hole of the manhole, particularly non-shrinkable mortar, resin
mortar,
epoxy resin or the like may be favorably used.
-5-
CA 02427846 2003-05-02 0283$ (PCT/JP02/07226)
[0030] In the present invention, after the pipes are laid between at least two
vertical holes by the jacking method, the manhole is constructed by assembling
make-up concrete members inside the vertical hole and the manhole structure is
constructed by fixing the waterproof flexible joint to the inner face of the
cut
hole of the assembled manhole with the manhole filler after fixing the joint
around an end portion of the pipe.
[0031]
(4) Waterproof flexible joint for manhole structure
In the present invention, the waterproof flexible joint for manhole
structure comprises the rigid cylindrical portion and the cylindrical flexible
portion.
[0032] In the present invention, in the case of the manhole to be constructed
on site, the waterproof flexible joint can be attached to an end portion of
the pipe
placed by the jacking method or the like before forming the manhole wall of
the
concrete manhole.
[0033] Further, according to the present invention, in the case of the
assembled make-up concrete manhole, after the manhole wall is formed, the
waterproof flexible joint can be attached to the pipe placed by the jacking
method.
In this case, after another pipe is additionally joined to an end of the pipe
placed
by the jacking method such that an end of another pipe may extend inside the
manhole through the hole, the waterproof flexible joint can be inserted
between
the hole of the manhole wall and another pipe.
[0034]
(5) Cylindrical flexible portion
In the present invention, the cylindrical flexible portion is fixed to the
outer periphery of an end of the pipe, and comprises the covering portion to
cover that end of the outer periphery of the pipe, the fixing portion to be
fixed to
the manhole, and the connecting portion to connect the covering portion to the
fixing portion.
(0035] The fixing portion of the cylindrical flexible portion is fixed to the
rigid cylindrical portion. The fixing portion can be fixed to the rigid
cylindrical
portion by any of various fixing means without particular limitations. As the
fixing means, bonding or the like may be used. If durability or stability is
-6-
CA 02427846 2003-05-02 02838 (PCT/JP02/07226)
considered, particularly a fastening band or a tightening band may be
favorably
used.
[0036] The covering portion of the cylindrical flexible portion covers and is
fixed to the outer periphery of an end of the pipe. The covering portion may
be
fixed to that end of the outer peripheral portion of the pipe by any of
various
fixing means. Particularly a tightening band can be favorably used.
[0037] As the connecting portion of the cylindrical flexible portion, various
members may be used without limitation on their shape, etc. so long as the
members are made of elastic materials capable of absorbing displacement
between the manhole and the pipe within a space formed between the rigid
cylindrical portion and the pipe.
[0038] In the present invention, the manhole is formed by pouring the
manhole filler around the outer periphery of the fixing portion of the
cylindrical
flexible portion attached around the pipe.
[0039] In the present invention, the space between the inner face of the hole
of the preliminarily formed manhole and the rigid cylindrical portion can be
buried by pouring the manhole filler around the outer periphery of the fixing
portion of the cylindrical flexible portion attached around the pipe.
[0040] In the present invention, the fixing portion and the covering portion
of
the cylindrical flexible portion are fixed to the manhole and the pipe,
respectively.
By doing so, the constant space can be kept between the manhole and the pipe.
Further, even if the manhole and the pipe exhibit different displacements to
form
a positional deviation, the cylindrical flexible portion can effectively
absorb such
displacements to prevent the joining portion from being broken.
[0041] In the present invention, the cylindrical flexible portion can be
formed
from an elastic material. Any elastic material does without particular limita-
tions so long as it is soft enough to absorb displacement between the manhole
and the pipe. Cylindrical flexible portions made of various materials such as
rubber may be used.
[0042] The cylindrical flexible portion may have a structure having double
cylindrical portions folded back midway. The double cylindrical portions of
the
cylindrical flexible portion serve as a covering portion and a fixing portion,
respectively. The double cylindrical portions is connected together by a
CA 02427846 2003-05-02 . 02838 (PC"T/JP02/07226)
connecting portion.
[0043] The cylindrical flexible portion may be provided with the rigid
cylindrical portion at an inner side of the outer cylindrical portion so that
the
outer cylindrical portion may not be folded inside.
[0044]
(6) Rigid cylindrical portion
In the present invention, the rigid cylindrical portion can be made of
any of various materials in any of various forms without particular
limitations.
In the present invention, a rigid pipe may be used. As such a pipe, a
corrosion-
resistant pipe made of stainless steel or the like may be favorably used.
[0045] The rigid cylindrical portion ensures the space to receive the connect-
ing portion of the cylindrical flexible portion between the rigid cylindrical
portion and the pipe. For this purpose, the rigid cylindrical portion
preferably
has strength that makes it difficult to be deformed with pressure of cast
concrete,
etc. In the present invention, the rigid cylindrical portion made of the same
material as that of the pipe may be used.
[0046]
(7) Protective member
In the present invention, a protective member may be used to prevent
unfavorable flow-in of the manhole filler or to assuredly form the space to
receive the connecting portion of the cylindrical flexible portion.
[0048] Such a protective member keeps a specific space between the rigid
cylindrical portion and the pipe, between the rigid cylindrical portion and
the
covering portion of the cylindrical flexible portion or between the manhole
and
the pipe.
[0049] Thus, the protective member may be provided between the rigid
cylindrical portion and the covering portion of the cylindrical flexible
portion or
between the inner mold frame to receive the manhole filler and the connecting
portion of the cylindrical flexible portion, for example.
[0050] In the present invention, the protective member may be removed after
the manhole filler is poured and the manhole is formed.
[0051]
(8) Jaw portion
_g_
CA 02427846 2003-05-02
02838 (PCT/JPOZ/07226)
In the present invention, a jaw portion may be provided at the outer
periphery of the fixing portion of the cylindrical flexible portion. Such a
jaw
portion bites into the manhole filler so that it may fix the fixing portion of
the
manhole. Further, the jaw portion serves to enhance adhesion between the
fixing portion and the manhole filler.
[0052] Any material and any shape may be employed for the jaw portion so
long as it bites into the manhole filler and is fixed inside the manhole
filler.
The jaw portion is preferably made difficult to be deformed by the pressure of
the
cast manhole filler.
[0053) In the present invention, an adhesive or a pressure-sensitive adhesive
to bond the jaw portion to the manhole filler may be applied to that surface
of the
jaw portion which contacts the manhole filler.
[0054] As the adhesive, a water-swelling rubbery adhesive, a non-vulcanizing
butyl rubber-based adhesive or a water-swelling sealant may be used. The non-
vulcanizing butyl rubber-based adhesive is preferred.
[0055] In the case of the waterproof flexible joint having the fixing portion
with the jaw portion and the adhesive attached to the outer surface thereof,
when
the j aw portion to which the adhesive is applied at the outer periphery of
the
fixing portion is buried in the manhole filler, water permeation between the
manhole and the rigid cylindrical portion can be prevented, and water leakage
through the interface of the manhole filler can be completely prevented.
[0056] The present invention will be explained in more detail with reference
to the attached drawings.
Fig. 1 is a vertical sectional view of a part of one embodiment of the
manhole structure according to the present invention. Fig. 2 is a perspective
view of a waterproof flexible joint for the manhole structure according to the
present invention. Fig. 3 is a vertical sectional view of a part of another
embodiment of the manhole structure according to the present invention.
[0057] As shown in Figs. 1 and 2, the manhole structure 1 has a manhole 2, a
pipe 3 and a waterproof flexible joint 4 for the manhole structure.
[0058] In the present invention, the manhole structure 1 is constructed by
fixing the waterproof flexible joint 4 around the .outer periphery of the pipe
3 and
then pouring the manhole filler around the outer periphery of the waterproof
-9-
CA 02427846 2003-05-02 02838 (PCT/JP02/07226)
flexible joint 4.
[0059] The manhole structure 1 is provided with the waterproof flexible joint
around the outer periphery of the pipe 3. The waterproof flexible joint 4
comprises a rigid cylindrical portion 5 and a cylindrical flexible portion 6.
[0060] The cylindrical flexible portion 6 comprises a covering portion 6a to
cover the outer periphery of the pipe 3, a fixing portion 6b to be fixed to
the
manhole 2 and a connecting portion 6c connecting the covering portion 6a to
the
fixing portion 6b.
(0061] The fixing portion 6b is fixed to the outer periphery of the rigid
cylindrical portion 5. The connecting portion 6c is made of an elastic
material
capable of absorbing displacement between the manhole 2 and the pipe 3.
[0062] The covering portion 6a is fixed around the outer periphery of the
pipe 3. The manhole 2 is formed by pouring the manhole filler around the outer
periphery of the fixing portion 6b.
[0063] In the present invention, the fixing portion 6b may be provided with a
jaw portion 7 as shown in Figs. 1 and 2. The jaw portion 7 has a non-
vulcanizing
butyl rubber layer 8 at its surface. The jaw portion 7 bites into the manhole
2.
[0064] In the present invention, the covering portion 6a can be fixed to the
outer periphery of the pipe 3 by using a pipe-tightening band 9 as shown in
Figs. 1 and 2. The fixing portion 6b can be fixed to the rigid cylindrical
portion
5 by using a rigid cylindrical portion-tightening band 10.
[0065] The manhole structure 1 of Fig. 1 is constructed in a vertical hole,
and
an earth-retaining casing 11 may be used as a mold frame for the manhole
filler.
[0066] Fig. 3 shows another embodiment of the manhole structure according
to the present invention.
The manhole structure 21 is almost the same as the manhole structure
1 except that a waterproof flexible joint 24 for manhole structure is used.
[0067] The waterproof flexible joint 24 comprises a rigid cylindrical portion
25 and a cylindrical flexible portion 26.
[0068] The cylindrical flexible portion 26 comprises a covering portion 26a
to cover a outer periphery of a pipe 23, a fixing portion 26b to be fixed to a
manhole 22 and a connecting portion 26c connecting the covering portion 26a
to.
the fixing portion 26b.
-10-
CA 02427846 2003-05-02 02838 (PCT/JP02/07226)
[0069] The covering portion 26a at an inner side of the cylindrical flexible
portion 26 is fixed to a pipe 23 as a projected pipe by means of a tightening
band 29.
[0070] Protective members 33a and 33b are inserted between the rigid
cylindrical portion 25 and the covering portion 26a and among an inner mold
frame 34 for the manhole filler, and the connecting portion 26c, respectively.
[0071] The manhole filler ~ such as concrete is poured between an earth-
retaining casing 31 as an outer mold frame and an inner mold frame 34, thereby
forming a concrete wall of the manhole.
[0072] In the manhole structure of Fig. 3, a jaw portion 27 is provided at the
fixing portion 26 on the outer side of the cylindrical flexible portion 26,
and the
non-vulcanizing butyl rubber or water-swelling sealant 28 is set at a surface
of
the jaw portion 27, which bonds the jaw portion to the manhole filler.
Thereby,
waterproof can be enhanced.
[0073] In the present invention, waterproof can be also enhanced by
attaching the non-vulcanizing butyl rubber or water-swelling sealant to the
outer
periphery of the fixing portion of the cylindrical flexible portion or the
rigid
cylindrical portion without providing the jaw portion.
[0074] According to the present invention, the manhole structure in which
the manhole and the pipe are joined together via the soft connection can be
easily
constructed by fixing the waterproof flexible joint for the manhole structure
around the pipe and then pouring the manhole filler around. the outer
periphery of
the waterproof flexible joint.
-11-
