NH-70-2 spec No.425-1

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

SPEC. F5-BC-425
Date: January, 2001

SPECIFICATIONS
of

NISSHA
Hydraulic pile hammer  

January 2001

Model
Pile hammer: NH-70-2

Quantity: unit(s)

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NIPPON SHARYO,LTD. 
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Nagoya, Japan
E-mail: KIDEN-KAIGAI@cm.n-sharyo.co.jp
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Home page: http://www.n-sharyo.co.jp
Marketing Tel: 81 - (52) -623-3316
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1 
 

NH-70-2 spec No.425-2

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

C O N T E N T S

Page
1. GENERAL
GENERAL CONDITIONS ..................
......... ...................
...................
............………3
...………3

2. OUTLINE………………………………………………......……..5

3. FEATURES ……………….........................................……...5

4. GENERAL
GENERAL VIEW …………………………………......……… 6

5. SPECIFICATION …………......................
…………........... .....................
...................……..
.........…….... 6

6. BLOW RATE
RATE BY STAGE
STAGE ………………………......……… 7

7. BASIC CONSTRUCTION .............

.........................
........................
...............……...
...……... 8

8. PRINCIPLE OF OPERATION
OPERATION …………………......……… 9

9. TABLE OF DYNAMIC ALLOWABLE

BEARING
BEARING FORCE……............………… 11

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NH-70-2 spec No.425-3

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

1. GENERAL CONDITIONS
1) This specifications shall cover the standard specification of Model NH-70-2
hydraulic pile hammer (here-in-after called “The machine” ) manufactured by
Nippon Sharyo, Ltd. shown in the drawing attached is the general arrangement
and principal dimensions of the
t he hydraulic pile hammer.

2) Design and workmanship

The machine shall be designed to perform the maximum efficiency with the
least fuel consumption and the lowest
l owest maintenance costs.
The workmanship shall be of the first class in all respects.
The machine shall be built for simple mechanical arrangement and easy in
inspection and maintenance.

3) Materials
The materials used in the manufacture of the machine shall be of the highest
quality, free from defects and imperfections.
Principal materials such as bolts, nuts, seals and steel plates used in the
machine confirm to the Japanese Industrial Standards. (Almost equal to ISO)

4) Test and inspection

Routine test and inspection in our factory shall be final.

5) Painting and lettering

Under-coating by anti-rust paint and enamel finishing shall be performed in
accordance with manufacturer’s standard practice.
Main parts of the equipment shall be painted in NISSHA Green and other
equipment in manufacturer’s standard.

6) Language and unit of measurement

measurement
All documentation, such as specifications, manuals, etc. shall be written in
English and all of equipment shall be designed in metric system.
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The equipment shall meet the following service conditions.
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temperature: -10 deg. C or higher and 35 deg. C or lower.
or accept the default settings.

8) Warranty
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All the machine specified herein shall be warranted by us for a period of twelve
Marketing (12) calendar months after the date of being to put into operation,
or fourteen (14) months after the date of shipment at a Japanese port, or one
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whichever is soonest.
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3 
 

NH-70-2 spec No.425-4

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

The warranty shall cover defects in design, materials and workmanship only,
shall not applicable to damage sustained mishandling of the machine or normal
wear and tear.
The warranty shall not be applicable to the parts and materials mentioned
below.

1) Wear plates
2) Wire ropes
3) Rubber made parts
4) Seals as o-rings, seal rings,
rings, back-up rings,
rings, etc.
5) Gaskets and sheet
sheet packings
packings
6) Filter elements
7) Batteries
8) Electric wiring
9) Glasses
10) Other quick moving parts
11) Lubricants

…………..Concluded

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4 
 

NH-70-2 spec No.425-5

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

2. OUTLINE

1) The Nippon Sharyo hydraulic hammer is a unique, new type unit completely different
from conventional ones which drive piles by lifting a ram to a certain height with a
hydraulic cylinder
cylinder and then letting it to drop by free ffall.
all.

The Nippon Sharyo hydraulic hammer is an epoch-making unit employing a “double

action” method in which the ram is forcefully accelerated by both hydraulic pressure
oil from the pump and high pressure gas to augment impact speed and thus creating
greater blow energy.

3. FEATURES

1) High blow rate, providing

providing better work efficiency.
2) Small longitudinal dimension, together with smaller size of adjacent leader and base
machine to be installed, makes transit
tr ansit easier.
3) Good blowing efficiency with
with deeper penetration per blow.
4) Small loss of hydraulic circuit, achieving
achieving less fuel cost.
5) Stabilized ram fall height adjustment because
because of installation of proximity switches.
6) Ram fall height can be confirmed at driver’s seat by adoption of ram fall height
indicating monitor.
7) Short stroke of cylinder, enabling longer
longer seal life.
8) Reduced fluctuation of hydraulic pressure lessens vibration of hose connecting
hammer and base machine, and lengthens hose life.
9) Sound insulator of our unique design for pile and cap blow enables work in low noise
noise..
10) Cushion wear alarm provides machine driver
driver with wear information of cushion.

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5 
 

NH-70-2 spec No.425-6

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

4. GENERAL VIEW

Fig. 1 General View of NH-70-2 Hydraulic

Hydraulic Hammer

5. SPECIFICATION

Model NH-70
Driving method Hydraulic cylinder,
double action
Ram weight 7.0 TON
Maximum ram stroke 1.28 m
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Blow
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Blow rate You 25 to 70 blow/min.
may change your settings at any time
(At maximum ram stroke)
or accept the default settings.
 Applicable pile
pile diameter
Concrete 300~600 mm dia.
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Steel pipe 300~800 mm dia.
Marketing Blow direction Vertical
Total weight (excl. cap)
Personalization 14.3 TON
Analytics Guide pipe, pitch x dia. 330 mm x 70 mm dia.
Reted pressure 160 kgf/cm 2 
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6 
 

NH-70-2 spec No.425-7

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

6. BLOW RATE BY STAGE

Stage Equivalent
Equivalent ram free fall height(m) Blow rate (blow / min)

8 1.28 25

7 1.12 27

6 0.96 30

5 0.80 35

4 0.64 40

3 0.48 47

2 0.32 54

1 0.16 70

*The blow rate above is the value for the hydraulic power source with pressure of 210
kgf/cm2  and flow rate of 218 l/min, and will vary depending on the specification of
hydraulic power sources.

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NH-70-2 spec No.425-8

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

7. BASIC CONSTRUCTION

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8 
 

NH-70-2 spec No.425-9

Due to company policy of continuous development and improvement, the right is reserved to change the specifications without
notice.

8. PRINCIPLE OF OPERATION

When ascending :
(1) Valve 1 and valve 2 are closed and valve 3 is opened.
(2) Pressurized oil from pump
pump flows
flows into
into the lower chamber of cylinder,
cylinder, oil in the upper
chamber returns to tank, and cylinder retracts to life ram.
(3) Simultaneously,
Simultan eously, excessive pressurized oil is stored in accumulator to reserve
pressure.
When descending :
(1) Valve 1 and valve 2 are opened, and valve 3 is closed.

(2) Pressurized
Pressuri zed oil from pump and oil in the lower chamber of
of cylinder flow into the upper
chamber of cylinder through valve 1.
(3) Simultaneously
Simultan eously oil pushed out by high pressure gas in accumulator passes through
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