Steel Tie Rods ( Sheet Pile Anchorage )

Steel Sheet pile walls can be strengthened by using steel steel tie rods  to connect to deadman anchorages allowing taller quay walls for port facilities or abutments. Correct design of steel tie rod  is vital for the stability of the structure as the main cause of failure for tied retaining walls is attributed to the tie rods, walings or anchorage. Steel tie rod are typically fabricated from round steel bars ensuring loads are safely transmitted from the retaining wall to the anchorage point.

Sheet piling Steel tie bar

Huaran New Material supply a number of solutions to meet the various anchorage situations encountered in practice. Traditional fixed ‘plate & nut’ connections can be used which initially are very economic but often do not allow for future movement in the structure such as settlement so can fail prematurely. Best practice in steel steel sheet pile anchorage design will use articulated steel tie rods which allow movement of the tie rod from its initial installation line to counter the effects of settlement in the structure. Further safety margins can be built in by using upset forged threads which reduces the stress at stiff sheet pile to tie rod connections.

Huaran New Material offer a range of very long, high-quality, steel tie rods made of round steel with a variety of connections including; upset threads, forged eyes, forged T-heads and forged spherical end.

The Construction Products Regulation of 2011 (CPR) came into force July 2013 making it mandatory for structural steel elements supplied within the European Union to be supplied CE marked indicating they meet the requirements of European harmonised design codes and are ‘fit for purpose’. Huaran steel tie rods, connections & walings meet this requirement and are manufactured under ISO 9001 and EN1090 independently audited quality systems. This has allowed Huaran New Material to successfully supply many projects around the world.

Sheet piling Steel tie bar

Problem situations can arise if the steel sheet pile embedment is too small or a change in terrain can cause the high lying soil to push the wall towards the water. To avoid failure of a sheet pile wall a secure anchorage should be provided. The main wall facing the water shall be attached by means of long tie rods to an anchor wall or deadman fixed inland. A cofferdam can be anchored by connecting steel tie rods from one side to the other.

The steel sheet piles are preferably anchored using round steel tie rods. The connection of the steel tie rod from  the front main wall to the rear to the anchor wall can be made individually. It is possible to connect the round steel anchors in each single sheet pile as well as to fasten them indirectly via a stiffening waling beam. In most cases, the waler consists of two U-profiles which are welded together with spacers. This is either attached to the sheet pile wall as tension waling with waling bolts or as compression waling on waling supports.

The waling performs several functions. On the one hand, it serves to align the steel sheet pile wall, on the other hand, it serves to transfer the loads and to fix the anchoring. The steel tie rods are attached to the waling via plates and nuts. To provide additional safety, the threads of the anchors should be upset providing more stress area at the threads than at the shaft of the steel tie rod. Thus upset threads absorb higher forces than the shaft of the steel tie rod system. To accommodate settlement of the ground steel tie rod connections should also be made in such a way that the threads are not subjected to bending. This is achieved by the use of articulated connections, eg pinned joints or spherical nuts and seating plates. By allowing the steel tie rod to rotate  overloading due to bending can be prevented.
Steel tie rods are safety critical items to the performance of an anchored sheet pile structure. By correct design of tie rods the future performance and service of the structure can be ensured for its design lifetime.

Types of steel tie rod

d1 type steel tie rod

1.Lock nut   2.Nut  3.Plate  4.Rod  5.Hingle Joint  6.Hinge Pin  7.Cotter Pin  8.Turnbuckle

D2 Type Steel Tie Rod

1.Lock nut   2.Nut  3.Plate  4.Rod  5.Hingle Joint  6.Hinge Pin  7.Cotter Pin  8.Turnbuckle

S1 Type Steel Tie Rod

1.Lock nut   2.Nut  3.Plate  4.Rod  5.Hingle Joint  6.Hinge Pin  7.Cotter Pin  8.Turnbuckle

S2 Type Steel Tie Rod

1.Lock nut   2.Nut  3.Plate  4.Rod  5.Hingle Joint  6.Hinge Pin  7.Cotter Pin  8.Turnbuckle

T1 Type Steel Tie Rod

1.T shape plate (Welded )   2.Hinge Pin  3.Cotter Pin  4.Rod  5.Turnbuckle  6.Hinge Joint  7.Plate  8.Nut  9.Lock Nut

Mechanical Properties of Steel Tie Rod

Steel Grade
Diameter
mM
Min Tensile Strength
MPa
Min Tensile Strength
MPa
Elongation
A
%
Reduction of Area
Z
%
Impact energy (longitudinal) Akw  J
20℃
0℃
-20℃
-40℃
-50℃
235
20-210
375
235
21
50
27
27
27
345
20-210
470
345
21
50
34
34
34
27
460
20-210
610
460
19
50
50
45
34
27
550
20-210
750
550
17
50
40
39
27
27
650
20-210
850
650
15
45
40
34
27
27

Dimensions of steel tie rod

  D
(mM)
T
(mM)
C
(mM)
E
(mM)
do
(mM)
L
(mM)
G
(mM)
20
16
28
39
19.5
65
M24×3
25
20
35
47
24.5
75
M30×3.5
30
26
41
55
29.5
85
M36×4
35
30
48
68
34.5
100
M42×4.5
40
35
55
76
39.5
105
M48×5
45
40
61
83
44.5
105
M56×5.5
50
42
68
97
49
125
M60×5.5
55
45
75
105
54
140
M68×6
60
50
81
113
59
145
M72×6
65
55
88
120
64
165
M76×6
70
60
95
133
69
170
M85×6
75
65
101
141
74
190
M90×6
80
70
108
148
79
210
M95×6
85
70
115
161
84
230
M100×6
90
75
121
170
89
250
M105×6
95
80
128
178
94
270
M110×6
100
85
135
186
99
285
M115×6
105
90
143
193
104
290
Tr125×10
110
95
149
200
109
300
Tr130×10
115
95
156
209
114
310
Tr135×10
120
100
162
225
119
320
Tr140×10
125
105
170
232
124
325
Tr150×12
130
110
176
246
129
330
Tr155×12
135
115
182
253
134
335
Tr160×12
140
120
189
260
139
340
Tr165×12
145
125
196
269
144
345
Tr170×14
150
130
202
278
149
350
Tr175×14
155
130
209
294
154
355
Tr180×14
160
130
216
303
159
360
Tr185×14
165
135
222
311
164
365
Tr195×16
170
140
229
320
169
370
Tr200×16
175
140
237
331
174
375
Tr205×16
180
140
246
341
179
380
Tr210×16
185
140
256
357
184
385
Tr220×18
190
140
266
368
189
390
Tr225×18
195
145
275
376
194
395
Tr230×18
200
150
280
385
199
400
Tr235×18
205
155
285
392
204
405
Tr240×18
210
160
290
400
209
410
Tr245×18