SANTAC CAP U-FD(P)
Water-proof ﬂexible joint for maintenance hatchAddition

Water-inﬂating rubber

Mortar stop sponge

Outer formworks(Casing)
Polyethylene cushioning material(Type1 : Gray / Type2 : Blue)

Maintenance hatch inner surface

Back-ﬁlling cushioning material

Main pipe

Back-up material

SANTAC CAP U-FD (P)Steel cylinder

Japan Sewerage New Technology Promotion Organization
Construction Technology Examination No. 1848

● Installation can be performed from the inner surface of the maintenance hatch .
● Clear earthquake resistance level 2.
● Water leakage is prevented by water expansion stop material.
● It can also be used for the propulsion method.
Installation Procedure
When water-inﬂating
coking is used to improve
the watertightness of the Adjusting the dimensions Inserting polyethylene cushioning
maintenance hatch drilling of the back-ﬁlling section and backing cushioning
cushioning material
Fabric tapeand ﬁlling mortar
No need when ﬁlling with sand.
boundaries.
《Option》 Water expansion caulking

When winding casing andmaintenance hatch with concrete,
etc.
Measure the distance from thewaterproofer to the outside of themaintenance hatch and adjust thedimension with polyethylene
cushioning and backing cushioning
materials.

Drilled surface
Coking is put on the drilledsurface, and shaped with a trowelso that the center of the drillingsurface is the thickest.
Note 1
Please dry with a burner, etc.
before applying it because it will
not stick to the wet side.

Position U-FD so that its top edge
is within 5mm of the manhole
inside.
Water-inﬂating rubber

Back-up material
insertions

Peel oﬀ the protective ﬁlm of thefastening band, and tighten thetwo fastening bands ﬁrmly withthe dedicated rajet wrench until
the band lifts up from the backside.
Retighten from the fastening
band on the back side.
Note 1
Be sure to remove the protective
ﬁlm from the fastening band.

Mortar stop sponge
U-FD main body rubber① Polyethylene cushioning materials andbacking cushioning materials will be madeto be enveloped by fabric tapes at the site.
② Insert the back ﬁlling section cushioning
material from the inside of the maintenancehatch.
③ Insert the polyethylene buﬀer material fromthe inside of the maintenance hatch.

Tightening band

Note 2
Coking requires 12 hours or more
for the surface to harden, so it'sbest to apply it 12 hours or moreago.

Flexible joint insertion

Cushioning material for backﬁlling section
Polyethylene cushioning material

Note 2Be sure to check the tighteningof the fastening band.

Back-up material
Push the backup material
between the steel cylinder andthe main pipe so that water stop
mortar does not enter.
N.B.
Make sure that the cut-oﬀ parthas two weighs on the back-up
material and that no waterproof
mortar enters from the cut-oﬀ
part.

Checking the main pipe
connection positionIf the main pipe is misaligned, checkthe connection position with themain pipe. If the width is small, cut
the mortar-stop sponge of theﬂexible joint with a cutter, etc., andadjust.

Cutting the pipe

Cut the main pipe according to theinner surface of the maintenancehatch.

Static mortar
ﬁllingMortar ﬁnish

Fill the gap between
the drilled surface andthe steel cylinder withwater stop mortar.

Depending on thedepth of the decorative
material, the back-up
material is pushed in,and mortar is ﬁlled tocarry out decorativeﬁnishing.

N.B.
The gaps in the formworks around the outercircumference of the hume pipe may become
blurred. Smooth the convex part with sander
and the concave part with epoxy, etc.

■ Tectonic proﬁle■ Dimensions of Rubber Body
(The type 2 products will be made-to-order.)Butyl rubber adhesive(Span seal)

Mortar stop sponge
Water-inﬂating rubber

TYPE1: V-150 〜 V-350/ H-200 〜 H-250
aPolyethylene
cushioning material

Back-up material

AB

Butyl rubber adhesive(Span seal)

Expansion band
(SUS304)

Fastening band
(SUS304)
Waterprooﬁng mortarLaa-a cross section

Polyethylene cushioning material(Type1 : Gray / Type2 : Blue)
CasingSANTAC CAP U-FD (P)Main pipe

B

Maintenancehatch innersurface

TYPE2: V-400 〜 V-600 / H-300 〜 H-800aA

Decorative ﬁnish

Cushioning
material for backﬁlling section
Water-inﬂating rubberLa

Steel cylinder(SUS304)

Water expansion
caulking

Mortar stop sponge

a-a cross section

Figures are from V-150 to V-350■ Rubber properties
ItemDensity

Normalcondition

Test value

Testing method1.15±0.05
Mg/ ㎥（1.11±0.05）

1.15（1.11）

JIS K 6268

Hardness‑60±5（50±5）6052

JIS K 6253

Tensile strengthMPa侒18.0

20.0（19.6）

JIS K 6251

Elongation％

侒400480（550）

JIS K 6251

+2（+1）JIS K 6257※1−5（−4）

JIS K 6257※1

Hardness change
Aging■ Rubber Dimensions Table

Standard value

Unit

Tensile strength change
Elongation change‑0 〜 +7％％

侑-20-30 〜 +10※ V : PVC pipe / H : Hume pipe−3（−10）※1: Normal oven method 70±1℃×72 hours

PVC pipe

V-150(165)304

Hume pipe
Dimensions(Unit mm) Product Number
Standard drilling(Tube Outer Diameter)
diameterBL

Product Number Standard drilling(Tube Outer Diameter)
diameterA

169 252 115(140)

H-200(318)464

Dimensions(Unit mm)
A

B

L

322 410 115(140)

V-200(216)356

220 304 115(140)

H-250(360)530

374 456 125(140)

V-250(267)410

271 356 115(140)

H-300(414)530

416 482 160(160)

V-300(318)464

322 410 115(140)

H-350(470)586

472 532 160(160)

V-350(370)530

374 456 115(140)

H-400(526)644

528 588 160(160)

V-400(420)530

422 482 160(160)

H-450(584)760

586 660 160(160)

V-450(470)586

472 532 160(160)

H-500(640)760

642 702 160(160)

V-500(520)644

522 588 160(160)

H-600(760)886

762 826 160(160)

V-600(630)760

632 692 160(160)

H-700(880)1002

882 946 160(160)

H-800(960)1120

962 1026 160(160)

JIS K 6257※1( ) are of type 2

Unit mm● Applicable types are PVC, hume, and resins● Figures in（ ）in L are for maintenance hatche with an internal diameter of 1500mm.

■ Physical properties of butyl rubber adhesive ■ Waterprooﬁng performance
Item

Normalcondition

Unit

Standard value

Test value

Testing method

Density

Mg/ ㎥

1.40±0.10

1.41

JIS K 6268

Penetration‑75±1577

JIS K 2207※2

Non volatility

MPa

侒9799

150℃×Weight remaining ratio
after 5 hours

Tensile strengthMPa侒0.0690.078

Elongation%

侒1000

1120

Waterprooﬁng
performance

Figures

External waterpressure

Loading time

Test Results

Normalposition‑

0.1Mpa3 minutes

No water leakEscapedisplacement

60 ㎜

0.1Mpa3 minutes

No water leak

JIS K 6251

Settlement
displacement

20 ㎜(15 ㎜ )0.1Mpa3 minutes

No water leak

JIS K 6251

Bending
displacement

15°(5°)

0.1Mpa3 minutes

No water leak

※2: Total weight 100g / Loading time 5 sec. / Measuring stitches 1 mm() Type 2

The speciﬁcations and appearance are subject to change without notice for
product improvement.

HAYAKAWA RUBBER CO. ,LTD
https://www.hrc.co.jp/

Head Oﬃce5351 Minamioka, Minoshima-cho, Fukuyama City, Hiroshima Prefecture

Overseas Dept.
1-16-10, Saga, Koto-ku, Tokyo
2020.11.19.SKD