1. A gland provided for a pipe joint in which a spigot
is inserted into a socket, and
5 a seal member is inserted between an outer
circumference of the spigot and an inner circumference of
the socket,
wherein the gland is fit onto the spigot so as to
face an opening end face of the socket from outside and
10 is coupled to the socket with a plurality of fasteners so
as to press the seal member into the socket,
the gland has a pressing face for pressing the seal
member, a plurality of fastener insertion holes where the
fasteners are inserted, an equal interval region in which
15 intervals between the fastener insertion holes in a
circumferential direction are kept at equal intervals,
and an extended interval region in which an interval
between any adjacent two of the fastener insertion holes
is larger than the equal intervals, and
20 the extended interval region includes a reinforcing
member.
2. The gland as claimed in claim 1, wherein the extended
interval region faces an obstacle that interferes with a
25 joining operation for the pipes to each other.
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3. The gland as claimed in claim 1 or 2, wherein the
reinforcing member is provided on a side opposite to the
pressing face, protrudes from the side opposite to the
pressing face in a separating direction that separates
5 the spigot from the socket, and is located outside an
inner circumference of the gland in a radial direction,
and
a step portion is formed between the inner
circumference of the gland and an inner circumference of
10 the reinforcing member.
4. The gland as claimed in claim 1 or 2, wherein the
reinforcing member is provided on a side opposite to the
pressing face, protrudes from the side opposite to the
15 pressing face in a separating direction that separates
the spigot from the socket, and is located outside an
inner circumference of the gland in a radial direction,
and
a tapering portion is formed between the inner
20 circumference of the gland and an inner circumference of
the reinforcing member, and
the tapering portion tilts outward in the radial
direction as the tapering portion extends in the
separating direction that separates the spigot from the
25 socket.
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5. The gland as claimed in claim 1, wherein the
reinforcing member is provided between the two adjacent
fastener insertion holes in the extended interval region.
5 6. A pipe joint comprising the gland as claimed in claim
1, wherein a spigot is inserted into a socket,
a seal member is inserted between the outer
circumference of the spigot and the inner circumference
of the socket,
10 the gland is fit onto the spigot so as to face the
opening end face of the socket from the outside and is
coupled to the socket with the plurality of fasteners
while the extended interval region faces an obstacle that
interferes with a joining operation of the pipes,
15 the gland has a pressing surface in contact with the
seal member, and
the fasteners are inserted into the fastener
insertion holes of the gland.
20 7. A method for joining pipes using the gland as claimed
in claim 1, wherein the spigot is inserted into the socket,
and the gland is coupled to the socket and the seal member
is inserted between the outer circumference of the spigot
and the inner circumference of the socket by inserting
25 the fasteners into the fastener insertion holes of the
gland and tightening the fasteners in a state in which
the extended interval region of the gland faces an
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obstacle that interferes with a joining operation of the
pipes.
8. The method for joining pipes as claimed in claim 7,
5 wherein the spigot is inserted into the socket, and the
gland is coupled to the socket by inserting the fasteners
into the fastener insertion holes of the gland and
tightening the fasteners in a state in which the spigot
is diagonally deflected relative to the socket.