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Cap-shaped steel plate pile

A steel sheet pile and hat-shaped technology, which is applied to sheet pile walls, buildings, and foundation structure engineering, can solve problems such as reduced construction efficiency, local bending, and increased penetration resistance, so as to suppress bending/deformation, ensure stability, The effect of improving constructability

Active Publication Date: 2014-02-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] For such toppling and deflection of steel sheet piles, although there are methods of suppressing joint resistance by strictly specifying construction management standards, this leads to a decrease in construction efficiency at the same time.
[0014] In addition, there is a problem that the cause of the increase in frictional resistance due to the deformation of the steel sheet pile is not eliminated, so even if the steel sheet pile is pulled out and re-driven, it cannot be corrected.
However, it is obvious that if the section is enlarged, the penetration resistance during construction increases
In addition, if the plate thickness is reduced, damage such as local bending may occur during construction and transportation, which may cause problems in the performance of the steel sheet pile.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] As an example of the present invention, hat-shaped steel sheet piles of the specifications shown below were designed.

[0168] B=1400mm, H=540mm, θ=75°, I=114810cm 4 / m

[0169] Check whether the hat-shaped steel sheet piles of the above specifications are within the range of the above indicators.

[0170] Bringing the specifications of the above-mentioned hat-shaped steel sheet piles into the formula (4) and the formula group (C), the results are as follows.

[0171] (4) Formula: 2.65×10 -4 ×I+22≤θ≤80(20000≤I<200000)

[0172] 2.65×10 -4 ×I+22=2.65×10 -4 ×114810+22=52.4

[0173] 52.4<θ=75<80, θ is within the range of formula (4).

[0174] In the case of formula group (B): 67<θ≤80 (80000≤I<200000), θ=75° of the hat-shaped steel sheet pile satisfies 67<θ=75<80, that is, formula group (B).

[0175] Therefore, it turns out that the hat-shaped steel sheet pile of this Example mentioned above is excellent in economical efficiency and workability, and also is more exce...

Embodiment 2

[0177] As an example of the present invention, hat-shaped steel sheet piles of the specifications shown below were devised.

[0178] B=1400mm, H=540mm, θ=75°, I=81454cm 4 / m

[0179] Bringing the specifications of the above-mentioned hat-shaped steel sheet piles into the formula (4) and the formula group (B), the results are as follows.

[0180] (4) Formula: 2.65×10 -4 ×I+22≤θ≤80(20000≤I<200000)

[0181] 2.65×10 -4 ×I+22=2.65×10 -4 ×81454+22=43.6.

[0182] 43.6<θ=75<80, θ is within the range of formula (4).

[0183] When formula group (B): 67<θ≤80 (80000≤I<200000), θ=75° of the hat-shaped steel sheet pile satisfies 67<θ=75<80, that is, formula group (B).

[0184] Therefore, it turns out that the hat-shaped steel sheet pile of this Example mentioned above is excellent in economical efficiency and workability, and also is more excellent in economical efficiency.

[0185] In addition, in the above description, although the multiplication of the economic index and the cons...

Embodiment 3

[0190] As a research example on the setting method of the constructability index R of the present invention, a steel sheet pile model (length 100 cm) with a scale of 1 / 12 was pressed into a foundation made of No. 5 silica sand at a constant speed. Examples of construction tests of driven models.

[0191] Regarding the implementation examples of the model construction test, Table 3 shows the shape converted into the actual size, the economic index 1 / W and the constructability index R determined based on the shape. In addition, the shape of the sample is set such that the section moment of inertia I per 1 m of the sample is about 55000 (cm 4 / m).

[0192] Table 4

[0193] Implementation examples of model construction tests

[0194]

[0195] Table 5 compares the value of the penetration resistance (maximum load) P during construction and the normalized P / P45° of the penetration resistance (maximum load) P45° of the utilization case (2) (θ=45°), and the constructability inde...

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Abstract

Provided is a cap-shaped steel plate pile. When a steel plate pile wall is formed, cross sectional inertia moment I(cm<4> / m) every wall width of 1m, weight W(kg / m<2>) of unit wall area, penetration resistance (R) and a web angle theta(degree) are in the relation set to satisfy either following a formula group (A) or a formula group (B). The formula group (A) is that (W / I)XR< / =0.004, and 2.65X10<-4>XI+22< / =theta< / =2.80X10<-4>XI+48, wherein 20000< / =I<80000; 2.65X10<-4>XI+22< / =theta< / =70, wherein 80000< / =I<180000. The formula group (B) is that 0.004<(W / I)XR< / =0.0075, and 2.80X10<-4>XI+44.6<theta< / =80, wherein 20000< / =I<80000; 67<theta< / =80, wherein 80000< / =I<200000).

Description

technical field [0001] The invention relates to hat-shaped steel sheet piles used in underground soil retaining and river banks. [0002] In this specification, a hat-shaped steel sheet pile refers to a steel sheet pile in which a web portion is continuously formed at both ends of an upper flange portion, a lower flange portion is formed at each end of a pair of web portions, and the entire Formed into an approximate hat shape. Background technique [0003] As one of the performance indexes of the steel sheet pile wall constructed by fitting the joints of the steel sheet piles, there is a section moment of inertia (I) showing the rigidity of the wall. Generally speaking, if the section moment of inertia (I) is large, the deformation of the wall when loads such as earth pressure and water pressure act are small. [0004] Although the section moment of inertia (I) can be increased by increasing the plate thickness (t), height (H), etc. of the steel sheet pile, from an econom...

Claims

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Application Information

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IPC IPC(8): E02D5/04
Inventor 恩田邦彦河野谦治宇佐美俊辅
Owner JFE STEEL CORP
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