JP5114726B2 - Steel material for underground continuous wall and design method for steel material for underground continuous wall - Google Patents

Description

The present invention relates to a steel material for underground continuous walls and a method for designing a steel material for underground continuous walls that are widely used when building earth retaining walls or revetment walls in architectural civil works.

Conventionally, (1) steel materials for composite underground walls (composite steel sheet piles), which are used when constructing earth retaining walls or underground continuous walls and are combined and integrated with steel sheet piles and H-shaped steel, A steel material for underground continuous wall is known in which a linear steel sheet pile or a wall-plate-like steel sheet pile is fixed to one side flange of a section steel by welding (for example, see Patent Document 1).
Moreover, the underground continuous wall which combined U-shaped steel sheet pile and H-shaped steel, I-shaped steel, or T-shaped steel as steel material for underground continuous wall whose rigidity is higher than steel material for underground continuous wall of said (1). Steel materials are also known (see, for example, Patent Documents 3 to 6).

  When building underground continuous walls, it is constructed by connecting many steel sheet piles as described above in the horizontal direction, which costs a lot of money, but the length of one steel sheet pile for underground continuous wall is reduced. If possible, the underground continuous wall or retaining wall constructed using a large number of steel sheet piles will be easier to transport and easier to drive, as the weight of the steel material for the underground continuous wall will be lighter. The construction work period can be shortened, the underground continuous wall can be constructed at a low cost, and the construction cost can be reduced. Therefore, a lightweight and inexpensive steel material for underground continuous walls is desired.

  In the form in which the H-shaped steel sheet pile is fixed in the groove of the U-shaped steel sheet pile, since the H-shaped steel is fixed on the inner surface side where the inclination angle of the web of the U-shaped steel sheet pile is large, There is a problem that the ground inside the groove of the sheet pile is consolidated and easily closed, but the combination of the hat-shaped steel sheet pile and the H-shaped steel, which is looser than the inclination angle of the U-shaped steel sheet pile, reduces the consolidation of the ground. It has the advantage of eliminating more.

  By the way, since the hat-shaped steel sheet pile 2 manufactured by rolling as shown in FIG. 8 requires a large amount of rolling manufacturing equipment costs when the dimensions thereof are changed, the existing hat-shaped steel sheet piles are shown in FIGS. Is a hat-shaped steel sheet pile 2 having dimensions (unit: mm) as shown in FIG. As a characteristic of these hat-shaped steel sheet piles 2, webs 5 that are inclined so as to spread outward are integrally connected to both ends of the flange 7, and the arm portions 3, 4 are parallel to the flange 7. Is a hat-shaped steel sheet pile 2 having a hat-shaped cross section in which a joint 14 is integrally formed at the end of each arm portion 3, 4. When the joint 14 between the adjacent hat-shaped steel sheet piles 2 is fitted to each other, the hat-shaped steel sheet pile 2 is arranged on the arm central axis line. It is also possible to set up.

  Since the hat-shaped steel sheet pile 2 has the inclined web 5 and the arm portions 3 and 4 on both sides thereof, the sheet pile width is wide, so that the number of driven-in sheets is reduced and an inexpensive wall body is constructed. It is possible to do. On the other hand, the hat-shaped steel sheet pile having high bending rigidity without changing the sheet pile width dimension cannot be easily manufactured at low cost.

JP 62-133209 A JP-A-11-140864 Japanese Patent Laid-Open No. 55-68918 Japanese Patent Laid-Open No. 06-280251 JP 2005-127033 A Japanese Patent No. 3603793

In each of the above prior arts, it is disclosed that a U-shaped steel sheet pile and an H-shaped steel are combined. However, the relationship between the length dimension of the H-shaped steel with respect to the U-shaped steel sheet pile is clarified in a more economical manner. There is no disclosure about making steel for underground continuous walls.
In addition, since there is a problem that a hat-shaped steel sheet pile having a high bending rigidity without changing the sheet pile width dimension cannot be easily manufactured at a low cost, it is possible to utilize a hat-shaped steel sheet pile existing or manufactured in the future. An inexpensive steel material for underground continuous walls with high rigidity is desired.

When this inventor makes the underground continuous wall steel material which incorporated the H-shaped steel 6 in the hat-shaped steel sheet pile 2, when constructing an underground continuous wall or a retaining wall, Paying attention to the fact that there is no reasonable reason for the same cross section over the entire length in the vertical direction, and if it is possible to suppress the top end displacement of the retaining wall to a practically no problem, it is cheaper. The present invention has been completed by variously examining that it becomes a steel material for underground continuous wall, and by using such steel material for underground continuous wall, it becomes a cheaper underground continuous wall or retaining wall.
The present invention is an underground continuous wall steel that incorporates the H-section steel while taking advantage of the hat-shaped steel sheet pile 2 described above, and the relationship between the length of the H-section steel relative to the hat-shaped steel sheet pile 2 is specified. The purpose of the present invention is to provide a steel material for underground continuous wall and a method for designing steel material for underground continuous wall that are cheaper and more practical. Thereby, the design method of the steel material for underground continuous walls and the steel material for underground continuous walls which can construct | assemble a cheap and practical earth retaining wall or underground underground wall can be provided.

In order to solve the above-mentioned problems advantageously, in the steel material for underground continuous wall according to the first aspect of the present invention, webs inclined so as to spread outward are integrally connected to both ends of the flange, and the flange is attached to each web. Are formed by a hat-shaped steel sheet pile having a cross-sectional hat shape in which a joint is formed at the end of each arm portion, a flange of the hat-shaped steel sheet pile, and each web. A steel material for an underground continuous wall composed of an H-shaped steel fixed to the inner surface of the flange on the groove side, the second hat-shaped steel sheet pile and the second H-shaped steel having the same length as the hat-shaped steel sheet pile So as to be 110% or less of the top horizontal displacement Y in the design of the steel material for the second underground continuous wall in the retaining wall using the steel material for the second underground continuous wall welded over the entire length. , shorten the length of the H-shaped steel than the length of the hat-shaped steel sheet pile In addition, the H-shaped steel is arranged in the length dimension of the hat-shaped steel sheet pile, and the lower end level of the hat-shaped steel sheet pile is matched with the lower end level of the H-shaped steel, The upper end level of the H-section steel is lower than the upper end level, and both the transverse section composed only of the hat-shaped steel sheet pile and the synthetic section composed of the hat-shaped steel sheet pile and the H-section steel in the cross section. A steel material having a cross section of
Further, in the second invention, in the steel material for underground continuous wall of the first invention, the level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-shaped steel in the steel material for underground continuous wall is: It is characterized in that it is a H-section steel cut to a size within 60% of the wall height H from the design ground to the ground surface in the retaining wall made of steel for medium continuous wall, and cut short by the above level difference dimension. And
In the underground continuous wall steel material according to the third aspect of the present invention, inclined webs are integrally connected to both ends of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flange. It is fixed to the inner surface of the groove-side flange formed by a hat-shaped steel sheet pile with a hat-shaped cross section in which a joint is formed at the end of each arm part, the flange of the hat-shaped steel sheet pile, and each web. A steel material for underground continuous walls made of H-shaped steel, wherein a second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and a second H-shaped steel are welded over the entire length. The length of the hat-shaped steel sheet pile so that it becomes 110% or less of the top horizontal displacement Y in the design of the steel material for the second underground wall in the retaining wall using the steel material for the underground continuous wall. The length of the H-section steel is shorter than the dimension, and the length of the hat-shaped steel sheet pile The H-section steel is arranged in the method, and the upper end level of the hat-shaped steel sheet pile is matched with the upper end level of the H-section steel so that the lower end of the H-section steel is lower than the lower end level of the hat-shaped steel sheet pile. A steel having a level as a high-level position, and a transverse cross section composed of only a hat-shaped steel sheet pile, and a transverse cross section composed of both a hat-shaped steel sheet pile and an H-section steel; It is characterized by that.
In the fourth invention, in the steel material for underground continuous wall of the third invention, the level difference dimension between the lower end level of the hat-shaped steel sheet pile and the lower end level of the H-shaped steel in the steel material for underground continuous wall is It is characterized in that it is an H-shaped steel cut short to a dimension within 30% of the total length of the steel material for medium continuous wall.
In the steel material for underground continuous wall according to the fifth aspect of the present invention, inclined webs are integrally connected to both ends of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flange. It is fixed to the inner surface of the groove-side flange formed by a hat-shaped steel sheet pile with a hat-shaped cross section in which a joint is formed at the end of each arm part, the flange of the hat-shaped steel sheet pile, and each web. A steel material for underground continuous walls made of H-shaped steel, wherein a second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and a second H-shaped steel are welded over the entire length. The length of the hat-shaped steel sheet pile so that it becomes 110% or less of the top horizontal displacement Y in the design of the steel material for the second underground wall in the retaining wall using the steel material for the underground continuous wall. The length of the H-section steel is shorter than the dimension, and the length of the hat-shaped steel sheet pile The H-section steel is arranged in the method, and the upper end level of the H-section steel is set at a lower level than the upper end level of the hat-shaped steel sheet pile, and the H-section steel is lower than the lower end level of the hat-shaped steel sheet pile. The lower end level of the steel plate is a high level position, and the cross section includes a cross section composed of only a hat-shaped steel sheet pile and a cross section composed of both a hat-shaped steel sheet pile and a synthetic cross section composed of H-shaped steel. It is characterized by using steel.
In the sixth invention, in the steel material for underground continuous wall according to the fifth invention, the level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-shaped steel in the steel material for underground continuous wall is the underground The lower end of the hat-shaped steel sheet pile in the steel wall for the continuous wall, which is a H-shaped steel cut short to a dimension within 55% of the wall height H from the design ground to the ground surface in the retaining wall made of continuous wall steel. The level difference dimension between the level and the lower end level of the H-section steel is characterized by being an H-section steel that has been cut short to a dimension within 30% of the total length of the steel material for the underground continuous wall.
In the design method of the steel material for underground continuous wall according to the seventh aspect of the invention, the inclined webs are integrally connected to both ends of the flange so as to spread outward, and the arm portions are integrated with each web in parallel with the flange. Fixed to the inner surface of the groove-side flange formed by a hat-shaped steel sheet pile with a cross-sectional hat shape in which a joint is formed at the end of each arm part, the flange of the hat-shaped steel sheet pile, and each web It is a design method of the steel material for underground continuous walls which consists of the H-shaped steel, and the second hat-shaped steel sheet pile and the second H-shaped steel having the same length as the hat-shaped steel sheet pile over the entire length. The hat-shaped steel so that it becomes 110% or less of the design top horizontal displacement Y of the steel material for the second underground continuous wall in the retaining wall using the welded steel material for the second underground continuous wall. The length of the H-section steel is shorter than the length of the sheet pile, and the hat The H-shaped steel is arranged within the length dimension of the steel sheet pile, and the lower end level of the hat-shaped steel sheet pile is matched with the lower end level of the H-shaped steel so that it is higher than the upper end level of the hat-shaped steel sheet pile. The top level of the H-section steel is at a low level position, and the cross-section includes a cross-section composed of only a hat-shaped steel sheet pile and a composite cross-section composed of a hat-shaped steel sheet pile and an H-section steel. It is designed to be a steel material provided with.
In the eighth invention, in the design method of the steel material for underground continuous wall according to the seventh invention, the level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-shaped steel in the steel material for underground continuous wall is Designed to be a H-section steel that is cut within 60% of the wall height H from the design ground to the ground surface in the retaining wall made of steel material for underground continuous wall, and is cut short by the above-mentioned level difference dimension. It is characterized by that.
In the design method for the steel material for underground continuous wall according to the ninth aspect of the invention, webs inclined so as to spread outward are integrally provided at both end portions of the flange, and arm portions are integrated with each web in parallel with the flange. A hat-shaped steel sheet pile with a hat-shaped cross section formed at the end of each arm part, and a flange-side flange inner surface formed by the flange of the hat-shaped steel sheet pile and each web. A method for designing a steel material for a continuous underground wall composed of a fixed H-shaped steel, which includes a second hat-shaped steel sheet pile and a second H-shaped steel having the same length as the hat-shaped steel sheet pile over the entire length. The hat shape so as to be 110% or less of the top horizontal displacement Y in the design of the steel material for the second underground continuous wall in the retaining wall using the steel material for the second underground continuous wall welded by welding. The length of the H-section is shorter than the length of the steel sheet pile, and The bottom of the hat-shaped steel sheet pile is made such that the H-shaped steel is arranged within the length dimension of the hat-shaped steel sheet pile, and the upper end level of the hat-shaped steel sheet pile coincides with the upper end level of the H-shaped steel. The lower end level of the H-section steel is higher than the level, and the cross section includes both a cross section composed only of a hat-shaped steel sheet pile and a composite section composed of a hat-shaped steel sheet pile and H-section steel. It is designed to be a steel material having a cross section.
In the tenth invention, in the design method for the underground continuous wall steel material of the ninth invention, the level difference dimension between the lower end level of the hat-shaped steel sheet pile and the lower end level of the H-section steel in the underground continuous wall steel material is: It is characterized in that it is designed to be an H-shaped steel that is cut short to a dimension within 30% of the total length of the steel material for underground continuous wall.
In the design method of the steel material for underground continuous wall according to the eleventh aspect of the invention, the inclined webs are integrally connected to both ends of the flange so as to spread outward, and the arm portions are integrated with each web in parallel with the flange. Fixed to the inner surface of the groove-side flange formed by a hat-shaped steel sheet pile with a cross-sectional hat shape in which a joint is formed at the end of each arm part, the flange of the hat-shaped steel sheet pile, and each web It is a design method of the steel material for underground continuous walls which consists of the H-shaped steel, and the second hat-shaped steel sheet pile and the second H-shaped steel having the same length as the hat-shaped steel sheet pile over the entire length. The hat-shaped steel so that it becomes 110% or less of the design top horizontal displacement Y of the steel material for the second underground continuous wall in the retaining wall using the welded steel material for the second underground continuous wall. Make the length of the H-section steel shorter than the length of the sheet pile, and The H-shaped steel is arranged within the length dimension of the shaped steel sheet pile, and the upper end level of the H-shaped steel is lower than the upper end level of the hat-shaped steel sheet pile, and the lower end of the hat-shaped steel sheet pile. The lower end level of the H-section steel is higher than the level, and the cross section includes both a cross section composed only of a hat-shaped steel sheet pile and a composite section composed of a hat-shaped steel sheet pile and H-section steel. It is designed to be a steel material having a cross section.
In a twelfth aspect of the invention, in the method for designing an underground continuous wall steel material according to the eleventh aspect of the invention, the level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-section steel in the underground continuous wall steel material is The H-shaped steel cut short to a dimension within 55% of the wall height H from the design ground to the ground surface of the retaining wall made of the steel material for underground continuous wall, and the hat-shaped steel in the steel material for underground continuous wall The level difference dimension between the lower end level of the sheet pile and the lower end level of the H-section steel is characterized in that it is designed to be an H-section steel that is cut short to a dimension within 30% of the total length of the steel material for underground continuous wall. To do.

According to 1st invention or 7th invention , it can be set as the steel material for underground continuous wall which is practically cheap with the upper end level of H-section steel being a low level position rather than the upper end level of a hat-shaped steel sheet pile, When using as steel material for earth retaining wall where earth pressure acts from one side, even if earth pressure acts and the top of the earth retaining wall is displaced in the earth pressure acting direction, the same length Within 10% increase in top edge displacement Y when using steel material for underground continuous wall welded across the entire length of the hat-shaped steel sheet pile and H-shaped steel sheet pile (ie, within 110% of the top edge displacement Y) As an earth retaining wall that can be practically applied, an inexpensive and lightweight steel material for underground continuous wall can be used to make an economical earth retaining wall.
According to the second invention or the eighth invention , for the practically inexpensive underground continuous wall, the upper end level of the H-section steel is lower than the upper end level of the hat-shaped steel sheet pile within 60% of the wall height H. When it is used as a steel material for a retaining wall where earth pressure acts from one side, using this, earth pressure acts and earth pressure acts on the retaining wall. Even if the retaining wall top end is displaced in the direction, it can be suppressed to a displacement within 10% increase of the top end displacement Y as in the first aspect of the invention. As the steel material for the medium continuous wall, an inexpensive and lightweight steel material for the underground continuous wall can be used to make an economical earth retaining wall.
According to 3rd invention or 9th invention , it can be set as the steel material for underground continuous walls which is practically cheap with the lower end level of H-section steel as a high level position rather than the lower end level of a hat-shaped steel sheet pile, When used as steel material for earth retaining wall where earth pressure acts from one side, earth pressure acts and the top of the earth retaining wall is displaced in the direction in which earth pressure acts on the earth retaining wall Even in the same manner as in the first invention, it can be suppressed to a displacement within 10% increase of the top end displacement Y, and it is inexpensive as a steel material for underground continuous walls for retaining walls that are practically applied. An economical earth retaining wall can be obtained by using a steel material for light underground continuous wall.
According to the 4th invention or the 10th invention , the lower end level of the H-section steel is practically set at a high level position within 30% of the total length of the steel material for the underground continuous wall rather than the lower end level of the hat-shaped steel sheet pile. It can be used as an inexpensive steel material for continuous underground walls, and when this is used as a steel material for earth retaining walls where earth pressure acts from one side, earth pressure acts and earth retaining Even if the earth retaining wall top end is displaced in the direction in which earth pressure acts on the wall, it can be suppressed to a displacement within 10% increase of the top end displacement Y as in the first aspect of the invention. As the steel material for the underground continuous wall for the earth retaining wall, an inexpensive and lightweight steel material for the underground continuous wall can be used to make an economical earth retaining wall.
According to the fifth or eleventh invention , the upper end level of the H-section steel is set to a lower level position than the upper end level of the hat-shaped steel sheet pile, and the lower end level of the H-section steel is higher than the lower end level of the hat-shaped steel sheet pile. It can be a steel material for underground continuous wall that is practically inexpensive at the level position, and when this is used as a steel material for earth retaining walls where earth pressure acts from one side, earth pressure Even if the top end of the earth retaining wall is displaced in the direction of earth pressure action, it can be suppressed to a displacement within 10% increase of the top end displacement Y as in the first aspect of the invention. As the retaining wall, an inexpensive and lightweight underground continuous wall steel can be used to make an economical retaining wall.
According to 6th invention or 12th invention , while making the upper end level of H-section steel into a low level position within 55% of wall height H rather than the upper end level of a hat-shaped steel sheet pile, from the lower end level of a hat-shaped steel sheet pile The lower end level of the H-section steel can be a practically inexpensive underground continuous wall steel with a high level position within 30% of the total length of the underground continuous wall steel. Then, when used as a steel material for earth retaining walls where earth pressure acts from one side, earth pressure acts and the earth retaining wall top end is displaced in the direction in which earth pressure acts on the earth retaining wall. However, as in the first invention, it can be suppressed to a displacement within an increase of 10% of the top end displacement Y, and it is inexpensive and lightweight as a steel material for underground continuous walls for retaining walls that are practically applied. The steel wall for underground continuous walls can be used to make an economical earth retaining wall.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  First, with reference to FIG. 1 and FIG. 2, the basic form of the steel material 1 for underground continuous walls used in this invention is demonstrated.

  The steel material 1 for underground continuous wall of the present invention is a steel material for underground continuous wall having a combination configuration of a hat-shaped steel sheet pile 2 and an H-shaped steel 6 having a length shorter than the height of the hat-shaped steel sheet pile 2. 1 and a steel material 1 for underground continuous wall having a special combination configuration in which the H-shaped steel 6 is arranged so as to be within the length dimension of the hat-shaped steel sheet pile 2. Both the hat-shaped steel sheet pile 2 and the H-shaped steel 6 are rolled steel materials by hot rolling.

  In addition, one flange 6a in the H-shaped steel 6 is arranged on the groove side formed by the flange 7 and the web 5 in the hat-shaped steel sheet pile 2, and one flange 6a in the H-shaped steel 6 is a hat-shaped steel. Abutting against the inner surface of the flange 7 in the groove of the sheet pile 2, both side portions of the flange 6 a of the H-section steel 6 are fixed to the inner surface of the flange 7 in the hat-shaped steel sheet pile 2 by welding W over the entire length. .

In addition, in the steel material 1 for the underground continuous wall of the first embodiment, the lower end level of the hat-shaped steel sheet pile 2 and the lower end level of the H-shaped steel 6 are matched, and the H-section steel is higher than the upper end level of the hat-shaped steel sheet pile 2. The upper end level of 6 is a low level position, that is, the steel material 1 for the underground continuous wall in which the upper end of the H-section steel 6 is cut short, and the steel material 1 for the underground continuous wall is a hat-shaped steel sheet pile 2 in cross section. The steel material has both a hat-shaped cross section composed only of the cross section and a cross section composed of both the hat-shaped steel sheet pile 2 and the composite cross section composed of the H-section steel 6. More specifically, when the underground continuous wall steel 1 is used as a wall material for retaining walls, the upper end level of the hat-shaped steel sheet pile 2 in the underground continuous wall steel 1 and the H-shaped steel 6 The level difference dimension from the upper end level is set to a dimension within 60% of the wall height H (see FIG. 3) from the design ground to the ground surface in the retaining wall 8 by the steel material 1 for underground continuous wall. The H-section steel 6 is cut short by the difference dimension.
In this embodiment, the relationship between the wall height H, the length dimension L1 of the hat-shaped steel sheet pile 2, and the length dimension L2 of the H-section steel 6 satisfies H × 0.60> (L1-L2). Have been to. Said (L1-L2) is the length A of the part which has a cross section comprised only by the hat-shaped steel sheet pile 2 of the upper end side in the steel material 1 for underground continuous walls.

  Therefore, in this embodiment, a highly rigid portion C having a cross section in which the hat-shaped steel sheet pile 2 and the H-section steel 6 are integrated is formed from the middle to the lower side of the steel material 1 for the underground continuous wall. In the figure, 6b is the other flange of the H-section steel 6, and 6c is a web of the H-section steel.

Moreover, in 2nd Embodiment shown to FIG.1 (a) (c) and FIG. 2, the upper end level of the hat-shaped steel sheet pile 2 and the upper end level of the H-section steel 6 are made to correspond, and the lower end level of the hat-shaped steel sheet pile 2 is shown. It is steel material 1 for underground continuous walls which made the lower end level of H section steel 6 the high level position, ie, cut the lower end of H section steel 6 short. More specifically, the level difference between the lower end level of the hat-shaped steel sheet pile 2 and the lower end level of the H-section steel 6 in the underground continuous wall steel 1 is 30 of the total length of the underground continuous wall steel 1. It is set as the H-section steel 6 cut short to the dimension within%. Therefore, in this form, the high rigidity part of the cross section in which the hat-shaped steel sheet pile 2 and the H-section steel 6 are integrated is formed from the middle to the upper side of the steel material 1 for underground continuous wall.
In this embodiment, the relationship between the length dimension L1 of the hat-shaped steel sheet pile 2 and the length dimension L2 of the H-section steel 6 satisfies L1 × 0.30> (L1-L2). Said (L1-L2) is the length B of the part which has a cross section comprised only by the hat-shaped steel sheet pile 2 of the lower end side in the steel material 1 for underground continuous walls.

Furthermore, in 3rd Embodiment shown to Fig.1 (a) (d) and FIG. 2, the upper end level of the H-section steel 6 is made into a low level position rather than the upper end level of the hat-shaped steel sheet pile 2, and the hat-shaped steel sheet pile 2 This is the underground continuous wall steel 1 in which the lower end level of the H-section steel 6 is set to a high level position, that is, the upper end and the lower end of the H-section steel 6 are cut short. More specifically, the level difference between the lower end level of the hat-shaped steel sheet pile 2 and the lower end level of the H-section steel 6 in the underground continuous wall steel 1 is 30 of the total length of the underground continuous wall steel 1. The H-section steel 6 is cut short to a dimension within%, and the upper end level of the H-section steel 6 is less than 55% of the wall height H than the upper end level of the hat-shaped steel sheet pile 2. H-section steel 6 is used. Therefore, in this embodiment, a high-rigidity section having a cross-section in which the hat-shaped steel sheet pile 2 and one flange 6a of the H-shaped steel 6 are integrated at the intermediate portion excluding the upper and lower ends of the steel material 1 for the underground continuous wall. Forming.
In this form, the cross section comprised only by the length dimension L1 of the hat-shaped steel sheet pile 2, the length dimension L2 of the H-section steel 6, and the hat-shaped steel sheet pile 2 on the upper end side in the steel material 1 for underground continuous wall. The relationship between the length A of the portion having the length B and the length B of the portion having a cross section composed only of the hat-shaped steel sheet pile 2 on the lower end side in the steel material 1 for the underground continuous wall satisfies A + B = L1-L2. A <H × 0.55 is satisfied, and B <L × 0.30 is satisfied.

  In addition, in the hat-shaped steel sheet pile 2 of each form, the joint 14 is integrally formed in the arm parts 3 and 4 of the edge part of the hat-shaped steel sheet pile 2 manufactured by hot rolling. An upward opening groove joint 14 having an upwardly opening groove 12a and a locking claw part 13 is provided at the end of one arm part 3, and a groove opening downward at the end of the other arm part 4 A downward opening groove-type joint 14 having 12b and a locking claw portion 13 is provided.

  In any case of the first embodiment to the third embodiment, the present invention uses the steel materials 1 for underground continuous walls in these embodiments, and the earth retaining wall 8 as shown in FIG. Is used, the top end displacement of the underground continuous wall steel 1 is obtained by using the underground continuous wall steel in which the hat-shaped steel sheet pile and the H-shaped steel sheet pile of the same length are welded over the entire length. Under the condition that there is no practical problem by suppressing the top end displacement Y to within 10% (that is, within 110% top end displacement Y), the more economical underground wall steel 1 is clarified, Thus, in order to make it possible to construct a reasonable earth retaining wall 8, frame calculation analysis in which various ground N values and wall heights H are changed is performed for each embodiment, as shown in FIGS. 4 to 7. A graph of the top edge displacement was created.

The main dimensions in FIG. 3 are as follows.
(1) Wall height H is the height dimension from the design ground surface 10 to the ground surface 9 (2) EL is the height dimension from the virtual ground surface 11 to the design ground surface 10 (3) The penetration length L is Height dimension from virtual ground surface 11 to bottom of hat-shaped steel sheet pile 2

Further, the underground continuous wall steel 1 of the first embodiment as shown in FIG. 1B is more specifically used as the earth retaining wall 8 having the form as shown in FIG. The result of the above-mentioned frame calculation analysis on the extent to which the wall height H can be practically cut at the upper end side of the H-section steel 6 when a load of 10 kN / m ² per unit area is loaded on 9 Is shown in FIG. As a criterion for judging whether or not it can be cut practically, a steel material for continuous underground walls in which a hat-shaped steel sheet pile and an H-shaped steel sheet pile of the same length are welded over the entire length (the conventional underground in the cross section shown in FIG. 2 over the entire length) There is a design top end displacement Y [m] when using a steel material for continuous wall), and the maximum is 0.05 m [50 mm]. Therefore, for example, as a design top end displacement Y when using a conventional steel wall for underground continuous wall, a steel material for underground continuous wall with a performance that generates a top end displacement of 40 mm to 45 mm at the maximum is targeted. When the steel material for underground continuous wall of the present invention having the performance corresponding to the above is designed, it is surely within 10% increase of the conventional top end displacement Y [m] and within the maximum top end displacement 50 mm, The design of the steel material 1 for underground continuous wall of the present invention is facilitated, and there is no practical problem in particular as the retaining wall 8 using this, so that the top displacement Y [m] is within a maximum of 10% increase. Set to.

  In FIG. 4, the horizontal axis represents the ratio of the cut length (omitted length A [m]) of the upper end of the H-section steel 6 to the wall height H [m] (omitted length A [m] / wall height H [m]. ), Dimensionless, and similarly, on the vertical axis, the top end displacement in the case of the combination of the H-shaped steel with the upper end cut and the hat-shaped steel sheet pile 2 (in the graph, the top-end displacement when H steel is omitted) ) And the top-end displacement when the H-section steel 6 having the same length as the hat-shaped steel sheet pile 2 is welded over the entire length (in the graph, the top-end displacement during full-length welding is indicated) Of top end displacement / top end displacement during full length welding), that is, the dimension of the top end displacement is made dimensionless, and the dimension A [m] ratio obtained by cutting the upper end side of the H-section steel and the top end displacement increase ratio As shown by the relationship, in either case, to keep the top edge displacement increase rate within 10%, cut to within 60% of the wall height H as shown by the vertical dotted line. It can be seen that Rukoto is possible.

Therefore, it is possible to cut the H-section steel 6 beyond 0% of the wall height H to within 60% of the wall height H. For example, when cutting the H-section steel 6 to 10% of the wall height H, if the wall height is 4.5 m, the cut will be 0.45 m H-section steel, and if the wall height is 5 m, the cut will be 0.5 m H-section steel. Thus, an inexpensive H-section steel is obtained. When cutting the H-section steel to 60% of the wall height H, it becomes a cut of 2.7 m H-section steel at a wall height of 4.5 m, and at a wall height of 5 m it becomes a cut of 3 m H-section steel, which is extremely inexpensive. It becomes a steel material for underground continuous wall using H-shaped steel, and a steel material for underground continuous wall that is inexpensive. Also, if the wall height H is within 30%, there is almost no change in the rate of increase in the top end displacement, and the member equivalent to the steel material for underground continuous wall in which the hat-shaped steel sheet pile 2 and the H-shaped steel 6 have the same length It can be seen that it is.
In the graphs of FIGS. 4 and 5 and FIGS. 6 and 7 to be described later, the case where the N value of the ground is 10 and the wall height is 4.5 m is indicated by a black circle, the N value is 20 and the wall height is 4 The case of .5 m is indicated by a white circle, the case where the N value is 5 and the wall height is 4.5 m is indicated by a white square, and the case where the N value is 10 and the wall height is 5.0 m is indicated by a black square. .
In addition, it is expected that the top end displacement decreases as the N value increases, and the top end displacement increases as the wall height H increases.

  Next, as for the steel material 1 for underground continuous wall of the second embodiment, the top end displacement is confined within 10% increase of the Y [m] as in the first embodiment. FIG. 5 shows the result of the frame calculation analysis in this case.

In FIG. 5, the horizontal axis represents the ratio between the cut length of the lower end of the H-section steel 6 (omitted length B [m]) and the hat-shaped steel sheet pile overall length [m] (abbreviated length B [m] / sheet pile overall length [m]. ]) Dimensionlessly, the top end displacement in the case of the combination of the H-shaped steel 6 and the hat-shaped steel sheet pile 2 with the vertical axis cut similarly at the lower end side (in the graph, the top end displacement when the H steel is omitted) And the top end displacement when the H-shaped steel 6 having the same length as the hat-shaped steel sheet pile 2 (not cut) is welded over the entire length (in the graph, the top end displacement is described as the top end displacement during full length welding). The ratio (the top end displacement when the H steel is omitted / the top end displacement during full length welding), that is, the increase rate of the top end displacement is shown in a non-dimensional manner. To show the relationship between the ratio of the dimension B [m] cut at the lower end side of the H-section steel to the total length and the increase ratio of the top end displacement, in either case, the increase ratio of the top end displacement is kept within 10%. As can be seen from the vertical dotted line, it can be cut to within 30% of the total length of the sheet pile.
Therefore, it is possible to cut the H-section steel 6 to more than 0% and within 30% of the overall length of the hat-shaped steel sheet pile. Moreover, if it is within 20% of the total length of the sheet pile, there is almost no change in the rate of increase in the top end displacement, and the steel steel sheet pile 2 and the H-section steel 6 are the same members as those for the underground continuous wall steel having the same length. I know that there is.
Other configurations are the same as those of the above embodiment.

  Next, as for the steel material 1 for underground continuous wall of the third embodiment, the top end displacement is kept within 10% increase of the top end displacement Y [m], similarly to the first embodiment. 6 and 7 show the results of the frame calculation analysis for specifically deriving the ratios of the cut lengths on both the upper end side and the lower end side of the H-section steel. In FIG. 6, the ratio of the cut length B [m] at the lower end of the H-section steel 6 is fixed, and the ratio of the cut length A [m] at the upper end of the H-section steel 6 is changed. By fixing the ratio of the cut length A [m] on the upper end side of the H-section steel 6 to be constant and changing the ratio of the cut length B [m] on the lower end of the H-section steel 6, When cutting the upper and lower ends of 6, the possible ratio of the cut length A [m] at the upper end of the H-section steel 6 to the wall height H and the sheet pile of the cut length B [m] at the lower end of the H-section steel 6 It is a graph for deriving the ratio which can be cut to the full length.

  Specifically, in FIG. 6, the ratio of the cut length B [m] on the lower end side of the H-section steel 6 to the steel material for underground continuous wall (the overall length of the sheet pile of the hat-shaped steel sheet pile 2) 1 is fixed to 0.30. In other words, when the cut length B [m] on the lower end side of the H-section steel 6 is fixed and the cut length A [m] on the upper end side of the H-section steel 6 is changed, In order to suppress the end displacement within 10% increase of the top end displacement Y, it indicates how much the upper end can be cut at the wall height H. Further, if the lower end cut length B [m] of the H-section steel 6 is reduced, naturally, the rigidity of the steel material 1 for the underground continuous wall is increased and the top end displacement is reduced, so that the wall height H exceeds 0%. As shown by the vertical dotted line, it can be seen that the cut of the H-section steel 6 within 55% can be suppressed within a 10% increase in the top end displacement Y [m]. The contents obtained by making the vertical and horizontal axes dimensionless are the same as those shown in FIG.

  Moreover, in FIG. 7, when the ratio of the cut length A [m] on the upper end side of the H-section steel 6 to the wall height H is fixed to 0.55, that is, the cut length A [ m] is fixed, and when the cut length B [m] at the lower end of the H-section steel 6 is changed, the top end displacement is suppressed within 10%. It shows what percentage of the total length of the H-section steel 6 can be cut at the upper end side. Moreover, if the cut length A [m] on the upper end side of the H-section steel 6 is reduced, naturally the rigidity of the steel material 1 for underground continuous wall is increased and the top end displacement is reduced. As shown by the vertical dotted line, it can be understood that if the cut is on the upper end side of the H-section steel 6 within 55%, the top end displacement Y [m] can be suppressed within 10%. The contents in which the vertical axis and the horizontal axis are timed are the same as those shown in FIG.

  When the upper end side of the H-section steel 6 is cut, if it is a value exceeding 0% of the wall height H as described above, an economic merit is produced. For example, it is preferable to set the wall height H within 10% and within 55% of the wall height H. Further, when the lower end side of the H-section steel 6 is cut, if it is a value exceeding 0% of the total length of the steel material 1 for the underground continuous wall as described above, an economic merit is produced. Since the economical merit is small at the cut ratio close to 0% of the total length of the steel material 1, for example, it is practically set within a range of 5% to 30% of the total length of the steel material 1 for underground continuous wall. It is good to do so.

  In this invention, you may use the hat-shaped steel sheet pile 2 which manufactured the whole member by the hot rolling process, manufactures a joint part by a hot rolling process, and fixes it to the arm parts 3 and 4 by welding. A hat-shaped steel sheet pile 2 may be used.

(A) is a top view which shows the state which arranged and fitted the steel materials for underground continuous walls of 1st-3rd embodiment of this invention in parallel, (b) is for underground underground walls of 1st Embodiment. A side view of steel materials, (c) is a side view of steel materials for underground continuous walls of a 2nd embodiment, and (d) is a side view of steel materials for underground continuous walls of a 3rd embodiment. It is a top view which expands and shows the steel material for underground continuous walls of embodiment of this invention. It is a vertical side view at the time of using the steel material for underground continuous walls of each embodiment as a retaining wall, and is explanatory drawing for demonstrating the relationship with top edge displacement. When the retaining wall is constructed using the steel material for underground continuous wall according to the first embodiment of the present invention in which the upper end level of the H-section steel is lower than the upper end level of the hat-shaped steel sheet pile, the upper end level is changed. It is explanatory drawing for demonstrating the top end displacement in the case of. When the earth retaining wall is constructed using the steel material for underground continuous wall according to the second embodiment of the present invention in which the lower end level of the H-section steel is higher than the lower end level of the hat-shaped steel sheet pile, the lower end level is changed. It is explanatory drawing for demonstrating the change of the top end displacement in the case of. For the underground continuous wall of the third embodiment of the present invention in which the upper end level of the H-section steel is lower than the upper end level of the hat-shaped steel sheet pile and the lower end level of the H-section steel is raised above the lower end level of the hat-shaped steel sheet pile. In order to explore the limit of the upper end level in steel materials, to explain the change of the top end displacement when the retaining wall is constructed using steel materials for underground wall with the lower end level constant and the upper end level changed. It is explanatory drawing of. For the underground continuous wall of the third embodiment of the present invention in which the upper end level of the H-section steel is lower than the upper end level of the hat-shaped steel sheet pile and the lower end level of the H-section steel is raised above the lower end level of the hat-shaped steel sheet pile. In order to explore the limit of the lower end level in steel materials, to explain the change in top end displacement when the retaining wall is constructed using steel for continuous underground walls with the upper end level kept constant and the lower end level changed. It is explanatory drawing of. It is a top view which shows one form of the conventional hat-shaped steel sheet pile. It is a top view which shows the other form of the conventional hat-shaped steel sheet pile.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel material for underground continuous walls 2 Hat-shaped steel sheet pile 3 Arm part of hat-shaped steel sheet pile 4 Arm part of hat-shaped steel sheet pile 5 Web of hat-shaped steel sheet pile 6 H-shaped steel 6a One flange 6b H-shaped steel Steel other flange 6c H-shaped steel web 7 Hat-shaped steel sheet pile flange 8 Earth retaining wall 9 Ground surface 10 Designed ground surface 11 Virtual ground surface 12a Groove 12b Groove 13 Locking claw portion 14 Joint

Claims (12)

Inclined webs are integrally connected to both end portions of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flanges, and joints are formed at the end portions of the arm portions. A steel material for continuous underground walls comprising a hat-shaped steel sheet pile having a hat-shaped cross section, and an H-shaped steel fixed to the inner surface of the groove-side flange formed by the flange of each of the hat-shaped steel sheet piles and each web. In the retaining wall using the second underground steel wall material in which the second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and the second H-shaped steel are welded over the entire length. The length dimension of the H-section steel is made shorter than the length dimension of the hat-shaped steel sheet pile so that it becomes 110% or less of the designed top end horizontal displacement Y of the steel material for the second underground continuous wall, in Then co to dispose the H-beam and a hat-shaped steel sheet pile to a length within the dimensions By matching the lower end level of the hat-shaped steel sheet pile with the lower end level of the H-shaped steel, the upper end level of the H-shaped steel is lower than the upper end level of the hat-shaped steel sheet pile. A steel material for underground continuous wall, characterized in that the steel material has a cross section configured and a cross section of both a hat-shaped steel sheet pile and a composite cross section configured of H-shaped steel.   The level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-section steel in the above-mentioned underground continuous wall steel is the wall height from the design ground to the ground surface in the retaining wall by the underground continuous wall steel. The steel material for underground continuous wall according to claim 1, wherein the steel material has a dimension within 60% of H, and is an H-section steel cut short by the level difference dimension. Inclined webs are integrally connected to both end portions of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flanges, and joints are formed at the end portions of the arm portions. A steel material for continuous underground walls comprising a hat-shaped steel sheet pile having a hat-shaped cross section, and an H-shaped steel fixed to the inner surface of the groove-side flange formed by the flange of each of the hat-shaped steel sheet piles and each web. In the retaining wall using the second underground steel wall material in which the second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and the second H-shaped steel are welded over the entire length. The length dimension of the H-section steel is made shorter than the length dimension of the hat-shaped steel sheet pile so that it becomes 110% or less of the designed top end horizontal displacement Y of the steel material for the second underground continuous wall, in Then co to dispose the H-beam and a hat-shaped steel sheet pile to a length within the dimensions Match the upper end level of the hat-shaped steel sheet pile with the upper end level of the H-section steel, and set the lower end level of the H-section steel higher than the lower end level of the hat-shaped steel sheet pile. A steel material for underground continuous wall, characterized in that the steel material has a cross section configured and a cross section of both a hat-shaped steel sheet pile and a composite cross section configured of H-shaped steel.   The level difference dimension between the lower end level of the hat-shaped steel sheet pile and the lower end level of the H-shaped steel in the above-mentioned underground continuous wall steel is H cut by 30% shorter than the total length of the underground continuous wall steel. The steel material for underground continuous wall according to claim 3, wherein the steel material is shaped steel. Inclined webs are integrally connected to both end portions of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flanges, and joints are formed at the end portions of the arm portions. A steel material for continuous underground walls comprising a hat-shaped steel sheet pile having a hat-shaped cross section, and an H-shaped steel fixed to the inner surface of the groove-side flange formed by the flange of each of the hat-shaped steel sheet piles and each web. In the retaining wall using the second underground steel wall material in which the second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and the second H-shaped steel are welded over the entire length. The length dimension of the H-section steel is made shorter than the length dimension of the hat-shaped steel sheet pile so that it becomes 110% or less of the designed top end horizontal displacement Y of the steel material for the second underground continuous wall, in Then co to dispose the H-beam and a hat-shaped steel sheet pile to a length within the dimensions The upper end level of the H-section steel is lower than the upper end level of the hat-shaped steel sheet pile, and the lower end level of the H-section steel is higher than the lower end level of the hat-shaped steel sheet pile. A steel material for an underground continuous wall, characterized in that the steel material has a cross section composed of only a cross section of both a cross section composed of a hat-shaped steel sheet pile and a synthetic cross section composed of an H-shaped steel.   The level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-shaped steel in the steel material for underground continuous wall is the wall from the design ground to the ground surface in the retaining wall by the steel material for underground continuous wall. The level difference between the lower end level of the hat-shaped steel sheet pile and the lower end level of the H-shaped steel in the steel material for the continuous wall of the underground is H-section steel cut to a dimension within 55% of high H. The steel material for underground continuous wall according to claim 5, wherein the steel material for underground continuous wall is a H-shaped steel cut short to a size within 30% of the total length of the steel material for continuous wall. Inclined webs are integrally connected to both end portions of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flanges, and joints are formed at the end portions of the arm portions. A steel plate for continuous underground walls comprising a hat-shaped steel sheet pile having a hat-shaped cross section, and an H-shaped steel fixed to the inner surface of the groove-side flange formed by the flange of the hat-shaped steel sheet pile and each web. It is a design method, and the soil using the second steel material for continuous wall in which the second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and the second H-shaped steel are welded over the entire length. The length dimension of the H-section steel is set to be longer than the length dimension of the hat-shaped steel sheet pile so that it becomes 110% or less of the design top horizontal displacement Y of the steel material for the second underground wall in the retaining wall. shortened, and to dispose the H-beam in the length dimension of the hat-shaped steel sheet pile And a lower end level of the bottom level and the H-shaped steel of the hat-shaped steel sheet pile to match as well as the upper level of the H-shaped steel than the upper end level of the hat-shaped steel sheet pile and a low-level position, in cross section, a hat-shaped steel sheet pile Designed to be a steel material having a cross section composed of only a cross section of both a cross section composed of a hat-shaped steel sheet pile and a composite cross section composed of H-shaped steel. Steel design method.   The level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-section steel in the above-mentioned underground continuous wall steel is the wall height from the design ground to the ground surface in the retaining wall by the underground continuous wall steel. The design method for steel materials for underground continuous walls according to claim 7, wherein the design is such that the dimension is within 60% of H, and the H-section steel is cut short by the level difference dimension. . Inclined webs are integrally connected to both end portions of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flanges, and joints are formed at the end portions of the arm portions. A steel plate for continuous underground walls comprising a hat-shaped steel sheet pile having a hat-shaped cross section, and an H-shaped steel fixed to the inner surface of the groove-side flange formed by the flange of the hat-shaped steel sheet pile and each web. It is a design method, and the soil using the second steel material for continuous wall in which the second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and the second H-shaped steel are welded over the entire length. The length dimension of the H-section steel is set to be longer than the length dimension of the hat-shaped steel sheet pile so that it becomes 110% or less of the design top horizontal displacement Y of the steel material for the second underground wall in the retaining wall. shortened, and to dispose the H-beam in the length dimension of the hat-shaped steel sheet pile And an upper end level of the upper level and the H-shaped steel of the hat-shaped steel sheet pile to match as well as the lower level of the H-shaped steel lower end level of the hat-shaped steel sheet pile and a high level position, in cross section, a hat-shaped steel sheet pile Designed to be a steel material having a cross section composed of only a cross section of both a cross section composed of a hat-shaped steel sheet pile and a composite cross section composed of H-shaped steel. Steel design method.   The level difference dimension between the lower end level of the hat-shaped steel sheet pile and the lower end level of the H-shaped steel in the above-mentioned underground continuous wall steel is H cut by 30% shorter than the total length of the underground continuous wall steel. 10. The method for designing a steel material for underground continuous wall according to claim 9, wherein the steel material is designed to be a shape steel. Inclined webs are integrally connected to both end portions of the flange so as to spread outward, and arm portions are integrally connected to each web in parallel with the flanges, and joints are formed at the end portions of the arm portions. A steel plate for continuous underground walls comprising a hat-shaped steel sheet pile having a hat-shaped cross section, and an H-shaped steel fixed to the inner surface of the groove-side flange formed by the flange of the hat-shaped steel sheet pile and each web. It is a design method, and the soil using the second steel material for continuous wall in which the second hat-shaped steel sheet pile having the same length as the hat-shaped steel sheet pile and the second H-shaped steel are welded over the entire length. The length dimension of the H-section steel is set to be longer than the length dimension of the hat-shaped steel sheet pile so that it becomes 110% or less of the design top horizontal displacement Y of the steel material for the second underground wall in the retaining wall. shortened, and to dispose the H-beam in the length dimension of the hat-shaped steel sheet pile The upper level of the H-shaped steel than the upper end level of the hat-shaped steel sheet pile while the low level position, the lower end level of the H-shaped steel lower end level of the hat-shaped steel sheet pile and a high level position, in cross section, a hat-shaped Underground continuity characterized in that it is designed to be a steel material having a cross section composed of only steel sheet piles and a cross section composed of both a hat-shaped steel sheet pile and a composite cross section composed of H-shaped steel. Design method for wall steel.   The level difference dimension between the upper end level of the hat-shaped steel sheet pile and the upper end level of the H-shaped steel in the steel material for underground continuous wall is the wall from the design ground to the ground surface in the retaining wall by the steel material for underground continuous wall. The level difference between the lower end level of the hat-shaped steel sheet pile and the lower end level of the H-shaped steel in the steel material for the continuous wall of the underground is H-section steel cut to a dimension within 55% of high H. The design method of the steel material for underground continuous walls according to claim 11, wherein the steel material is designed to be an H-shaped steel that is cut short to a size within 30% of the total length of the steel material for continuous walls.

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