Waterprooﬁng test

Adhesion test

Water stop ﬂexible joint for maintenance hatch

Hydraulic test

Vertical displacement test

Adhesion test

Hume pipe φ250 without

Hume Pipe Diameter 250
Displacement in the direction perpendicular to the tubeaxis 17 mm
Water pressure : 1 hour no abnormal

After attaching the SANTAC CAP to the maintenancehatch and hume pipe (φ250), the adhesion wasmeasured.

displacement
Water pressure1.5㎏f/㎠ : 1 hour
no abnormal

SANTAC CAP

Test conditions
The maintenance hatch and hume pipe (φ250) were
exposed outdoors after application of SANTAC CAP.
Outdoor exposure period: 15 months

Test Resultsn123※（）Within ㎏f/㎠

4

Average valueAdhesion
20.1 20.3 20.9 19.1
㎏f/25㎜×25㎜

20.3(3.3)

The disruption state was a cohesive disruption.

SANTAC BOND

Outline of external water pressure test
Testing method

Material/Butyl rubber

Since there is no oﬃcially speciﬁed method such as JIS, the water-tightness test was carried out in theThe number of SANTAC CAPs to which 1kgof SANTAC BOND adheres is as follows.

following manner in accordance with the test method of each Maintenance hatch Industry Association.

V- 75 〜 V-125 8pieces
Hydraulic tank

V-150 〜 V-300 6pieces① As shown in the ﬁgure on the left,
SANTAC CAP was attached to themaintenance hatch so that external
water pressure could act, and a tube
with a watertight lid was attached toSANTAC CAP, and the hydraulic watertank was ﬁxed to the maintenance hatch
outer wall to load water pressure.

Maintenance hatch
Bending angle

V-350 〜 V-400 5pieces② In order to conﬁrm the waterprooﬁng
property under the condition ofﬂexibility,a change angle was given by ajack and a hydropressure of 0.098Mpa
was maintained for 1 hour.

Jack③ The presence or absence of waterleakage was carried out visually, andthebending angle was read by a level
meter.

SANTAC CAP

Test Results
SANTAC CAP size

Types of pipes and pipe diameters External water pressure Bending angle Loading time250

Hume pipe φ250

0.147MPa0°

1 hourResults
No abnormal

200

PVC pipe φ200

0.098MPa10°

1 hourNo abnormal

250

Hume pipe φ2500.098MPa

10°

1 hourNo abnormal

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

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

HAYAKAWA RUBBER CO. ,LTD

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

Overseas Dept.
1-16-10, Saga, Koto-ku, Tokyo
2020.11.17.SKD

This product has been certiﬁed and certiﬁed by the Sewerage New Technology
Promotion Organization based on the Principal Terms for Implementation ofConstruction Technology Certiﬁcation Project (Sewerage Technology) in theConstruction Technology Certiﬁcation Project established by the Construction
Technology Certiﬁcation Council with the aim of contributing to the promotionof the utilization of new construction technology developed voluntarily by theprivate sector.

Innovative waterproof joints leading the 21st century
Water stop ﬂexible joint for maintenance hatch

SANTAC CAP

Certiﬁcation No. 1640

Speciﬁcations and composition

Tectonic proﬁleDimensions
Adhesive SPAN SEAL

Adhesive(SANTAC BOND)
Polyethylene cushioning materialExpansion

Butyl rubber adhesive(SPAN SEAL)

Inside maintenance hatch

Polyethylene cushioning
material
Butyl rubber adhesive
With protective ﬁlm(SPAN SEAL)

PVC pipe
Hume pipe

Mortar ﬁlling

Dimension table
Application

Main pipe

Part No.

Standarddrilling
diameterFastening band
Material/SUS304
PVC pipe

Fastening band
Material/SUS304

Rubber body

Note 1

Rubber body
Material/Specialty
synthetic rubber

Adhesive
SANTAC BOND

Since PVC pipes are ﬂexible pipes, pipe
openings may be deformed by earth pressure.
This is because there is a gap in the horizontal
direction between the maintenance hatch
drilling diameter and the PVC pipe, and before
returning ﬁll, take action in one of the followingways.
① Lateral gaps of 5cm or more are ﬁlled with
rapid-concluding cement.
② Insert the support bar in the verticaldirection of the PVC pipe until ﬁnishing work.

For details, please refer to the back cover page.

Comparison of Features and Method● The maintenance hatch
and fitting are cut off by
surface adhesion of adhesive(SPAN SEAL).
● Complete watertightness isachieved by crimping andfastening with pipes andfastening bands.

Conventional
methodSANTAC CAP

Watertightness

Flexibility

Durability

Workability

Economic Efficiency● SBR-based synthetic rubber
and its ingenuity enable us totrack uneven settlement andother changes.

● Durability is excellent due tothe use of SBR-based
synthetic rubber, Butyl
rubber-based adhesive,fastening bands, andforeclosure covers.
● It can be used under any
conditions because it uses
special synthetic rubber withozone resistance, weatherresistance, and chemicalresistance.

● It can be installed in about 20
minutes without skill.
● Anyone can easily apply theSANTAC BOND on themaintenance hatch side.
● It does not require curing andcan be filled back soon afterinstallation.

● The construction period can beshortened because backfillingis possible immediately aftermounting.
● Due to the watertightness andavailability of water, long-term
maintenance and management
costs can be reduced.

PowerfulSimple

Quickiy● It takes time for concrete,adhesives, and joints to cure,and it is not possible tobackfill.
● It is difficult to adjust thedeviation angle, and it isnecessary to devise abending tube or universal
fitting.
● Form assembly, concrete
placement and its curing arerequired.

● It does not require special
products and the cost of
installation is inexpensive.
However, because it is low inwatertightness and isunavailable, it incurs repair
costs and increases long-term
maintenance and management
costs. In addition, skilledconstruction is required forconstruction, and personnel
procurement and personnel
costs are a problem.

Bending angle

SPANSEAL● In some cases, water may leak ● It has little flexibility and mayfrom the surface over time.
receive displacement due to● There is a risk that irrigation
unequal settlement, etc., andmay be damaged or modified due
intruding water may enterto uneven settlement offrom the connection part.
backfilled soil and knitting loads ● Bonds are concrete or
associated with the drawing ofmortar.
arrowboards.

● Durability is unknown.

Note 2In order to ensure water-tightness, theminimum bond length between themaintenance hatch and the collar of theSANTAC CAP must be 5cm or moreaccording to the Sewerage Technology andTechnology Examination Certiﬁcate.

5㎝ or more

Hume pipe
Quik-setting cement

Supporting bar
Ceramics pipe

※ Please ask us because we have a detailed plan for each part number.

Procedure

20 minutes

Long time① After cleaning theopening, paint the ﬁrst
bond to avoid putting
water on this part.

② Installed in apredetermined position.

⑦ Pull protective ﬁlm oﬀ（Maintenance hatch side）⑧ Suﬃciently crimped③ Bond coating again.

④ SANTAC CAP installed.

⑨ Pull protective ﬁlm oﬀ（Pipe side）⑩ Tightening band

⑤ Positioning
The bond should betouched with yourﬁngers and allowed todry (5 to 10 minutes)
to a point where thebond is sticky but does
not stick to yourﬁngers.

⑥ From the inside of themaintenance hatch, ﬁll
the gap between thedrilled cross section andthe main pipe withcushioning material.

Especially below⑪ Fill mortar from inside tocomplete after backﬁll.
Precautions : Use protective equipment (gloves, etc.) to ensure safety.