JPH05331835A - Section steel for continuous wall - Google Patents

Abstract

PURPOSE:To improve concrete filling to joint parts by forming the opening width of female joint parts at web end parts in such a way that narrow width parts and wide width parts may alternately be continued in the length direction. CONSTITUTION:The web 1W end parts of a section steel 1 for continuous wall are provided with female joints 1A, 1B opened in the web shaft center direction. Next, the joints are formed into the shape in which the joints 1A having longitudinal narrow open width K and the joints 1B having longitudinal wide opening width K are alternately and continuously repeated. Next, each joint 1A is continued to each joint 1B through a funnel-shaped transient shape part having a gradually changed shape. In the use for synthetic structure with concrete, concrete is longitudinally flowed from the openings of the joints 1B to fill in the joints A. Thus, concrete tilling in a joint engaging part is improved, efficient construction is available, and reliability is assured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous wall section steel used for a composite structure with concrete.

[0002]

2. Description of the Related Art As the development of deep underground space progresses, it is used as a shaped steel for a continuous wall member.
Various types of cross-sections such as that shown in FIG. 8 (a) and 8 (b) show an example of the product shape of a straight type steel sheet pile used as a shape steel of a member for a continuous wall, wherein (a) group is a left-right asymmetric type, and (b) group is a left-right symmetric straight type steel. It's a sheet pile. In (1) to (8) of group (a), the left side of the web is a male joint and the right side is a female joint. In the group (a), (7) and (8) are formed into a male joint by shaping the cross section of the material in a symmetrical shape and then crushing only one (left side) joint portion. In the group (b), (1) is a female joint, and other male joints (2) to (9) are paired and used in combination with this female joint.

A general application of these continuous wall shaped steels is to form two continuous wall shaped steel 1 webs as shown in FIGS. 6 (a), (b), (c) and (d). It is used as a so-called box-type steel sheet pile, in which the H-section steel 3 or the plate 5 is welded to form a section having an H-section. 6 (a) and 6 (c) are examples in which the H-shaped steel 3 is welded, and FIGS. 6 (b) and 6 (d) are examples in which the plate 5 is welded. Further, in FIGS. 6 (a) and 6 (b), a large H-section steel 2a having a wide web equivalent to the effective width W of the continuous wall section steel 1 is used as a member of the male joint.
In (c) and (d), a small H-shaped steel 2b having a narrow web is used as a member of the male joint. Furthermore, FIG.
In (a), a deformation preventing stiffener 4 is used to compensate for the insufficient strength of the continuous wall shaped steel 1 and the large H-shaped steel 2a.

The characteristics of this steel box-type sheet pile are that it is excellent in cross-sectional performance, so that the wall thickness can be made thin, and that the surface of the constituent members is smooth, which makes it suitable for the wall function.
Specific applications include continuous retaining walls for underground space construction, foundation piles, earthquake-resistant walls for permanent construction, landslide deep foundation piles, etc. However, in a composite structure with concrete, which is most commonly used as an earth retaining / water-stopping wall, the conventional continuous wall shaped steel has a female joint with a cross-sectional shape having an opening width k as shown in Fig. 5 (a). Only a narrow shape has a uniform cross section in the longitudinal direction, so when used with a male joint,
Since the inner space of the joint is narrow, it is difficult to directly fill the inside of the joint with concrete by inserting a tremie pipe or the like, and it is difficult for concrete to enter from the outside of the joint because the gap between the male and female joints is small.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a member for a continuous wall which is excellent in workability as a composite structure with concrete by increasing the filling property of the concrete into the joint fitting of the shaped steel for a continuous wall. It is intended to provide.

[0006]

The gist of the present invention is to provide a continuous wall shaped steel having female joints at both left and right ends or one end of a web, wherein the opening width of the female joint is wide in the longitudinal direction of the shaped steel. A shaped steel for a continuous wall, characterized in that narrow portions and wide portions are formed so as to be alternately continuous.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The operation and embodiments of the present invention will be described below with reference to the drawings. The most typical example of the shape of the continuous wall shaped steel 1 of the present invention is shown in FIGS. In the figure, (a) is a front sectional view, (b) is a side view, and (c) is a plan view. The continuous wall shaped steel 1 has a joint portion thickness T that opens in the axial direction of the web at both ends of the web 1W formed to have a predetermined web thickness T _W.
F female joint 1A (cross section AA) and female joint 1B (cross section B-
B). The shaped steel for a continuous wall of the present invention includes a female joint 1A (cross section AA) having a narrow opening width k in the length direction and an opening width k.
Wide female joint 1B (sectional B-B) of having a length l _a, l _b only continuously repeated shape alternately. Female joint 1A
(Cross section AA) and the female joint 1B (Cross section BB) are continuous through a funnel-shaped transitional shape portion having a length l _ab that gradually changes into mutual shapes, and FIG. It is a perspective view of the continuous wall shaped steel 1 of this invention shown in FIG.

The shape of the continuous wall shaped steel 1 in FIG. 1 and the shape of the continuous wall shaped steel 1 in FIG. 2 have the same shape of the narrow female joint 1A (cross section AA), but the wide female joint 1A. The shape of 1B (cross section BB) is different. That is, in the shaped wall for continuous wall 1 of FIG. 1, the joint height H of the female joint 1B is higher than that of the female joint 1A, whereas the joint height H of the shaped steel for continuous wall 1 of FIG. It is the same over the entire length.

The distance W between the center portions of the left and right female joints 1A is called the effective width. 4 (a) and 4 (b) are continuous wall shaped steel 1
4A shows a product shape example of a connecting member 6 having a male joint that fits into the female joint 1A of FIG. 4A, and the connecting member 6 of FIG. 4A is a simple H-shaped steel having a short flange width. The connecting member 6 of 1) is a deformed H-shaped steel in which a flange serving as a male joint is curved outward to increase a joint internal space (a pocket margin) formed at the time of fitting with a female joint. The sectional shapes of the continuous wall shaped steel 1 shown in FIGS. 1 and 2 and the connecting members shown in FIGS. 4 (a) and 4 (b) are completely symmetrical vertically and horizontally. The present invention can also be applied to the formation of a joint portion of a linear steel sheet pile having a certain similar shape or an asymmetrical shape in the vertical and horizontal directions.

The shape of the continuous wall shaped steel of the present invention is basically as shown in FIG.
7 is a perspective view showing a state in which the box-shaped steel sheet pile is used as a composite structure with concrete. By the way, in the case of a composite structure with concrete, it is difficult to fill the joint portion with concrete because the conventional straight type steel sheet pile has a joint portion shape as shown in FIG. 5 (a) over its entire length. When the shaped steel for continuous wall of the invention is used, concrete can easily enter the joint portion through the opening of the female joint 1B (cross section BB) as shown in FIG. 5 (b). The female joint 1A (cross section AA) is filled with concrete that has entered from the female joint 1B (cross section BB) by flowing through the inner wall of the female joint in the longitudinal direction. Moreover, as shown in FIG. 5C, the cross-sectional shape from the female joint 1B (cross section BB) to the female joint 1A (cross section AA) smoothly changes like a funnel, so that the filling effect is great. Furthermore, since the female joint 1B (cross section BB) projects substantially at right angles to the web surface, it is rich in concrete trapping effect and excellent in adhesiveness. Therefore, by using such a continuous wall shaped steel, it is possible to perform reliable and reliable construction on a composite structure with concrete.

As described above, when the continuous wall shaped steel 1 of FIG. 1 is used, the shape of the female joint 1B is excellent in the effect of trapping concrete, but the joint height H is large, so that it is formed into a box-shaped steel sheet pile. In that case, the wall thickness becomes relatively thick. On the other hand, when the continuous wall shaped steel 1 of FIG. 2 is used, the concrete capturing effect of the female joint 1B is inferior to that of the continuous wall shaped steel 1 of FIG.
The joint height H is the same as the dimension of the female joint 1A, and the wall thickness can be made relatively thin. Therefore, it is advantageous when it is desired to use the limited land space as effectively as possible.

By the way, the length l _a in the longitudinal direction of the female joint 1A (cross section AA) in FIG. 1 is determined to be the minimum required length in view of the guideability and the fitting strength of the joint, and the penetration of concrete. From the above, the maximum allowable length is determined depending on the joint shape and the working conditions, but is in the range of 100 to 500 mm in the normal usage of the shaped steel of the present invention. Also, female fitting 1
The length l _b in the longitudinal direction of B (cross section B-B) is the maximum allowable length from the viewpoint of guideability and fitting strength as a joint, and the minimum required length from the invasion of concrete. However, in the normal usage of the shaped steel of the present invention, the range is 200 to 1000 mm.

As described above, the optimum values of the joint lengths l _a and l _b are determined based on the guide conditions and fitting strength of the continuous wall joint as well as the penetration of concrete into the joint fitting portion.
It is decided comprehensively according to the joint shape and construction conditions. Therefore, the design conditions of the continuous wall, and depending on the construction environment for each construction project, optimal l _a, l _b is to be requested as a product. The length l _ab of the transitional shape portion is determined by the formability in plastic working together with the function surface as a funnel. In the conventional continuous wall construction method such as cells with straight type steel sheet pile, a high fitting tensile strength was inevitably required because of the structure that secures the strength by the tensile force to the steel sheet pile body, but the shape steel of the present invention is used. In the continuous wall construction method, the basic design is that each box-shaped steel sheet pile bears the wall strength, so the role of the joint is only to hold the connecting positions of the left and right box-shaped steel sheet piles. Tensile strength is not very important. Therefore, in practice, the joint length l _a
The ratio of the total length to the total length may be generally 30% or less, and the shaped steel for continuous wall of the present invention is very effective from the viewpoint of efficiency of construction and reliability of the structure.

[0014]

EFFECTS OF THE INVENTION The continuous wall shaped steel in which the opening width of the female joint portion of the present invention is formed so that the narrow portion and the wide portion are alternately continuous in the longitudinal direction of the shaped steel is concrete as a box-type steel sheet pile. When used in a composite structure with and, it is possible to accurately meet the market needs for the efficiency of construction and ensuring the reliability of the wall, because the joint fitting part has excellent concrete filling properties.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of the shape of a shaped steel for continuous wall of the present invention.

FIG. 2 is an explanatory diagram showing another example of the shape of the shaped steel for continuous wall of the present invention.

FIG. 3 is a perspective view of a shaped steel for continuous wall of the present invention.

FIG. 4 is a schematic sectional view of a male joint that is a mating partner.

FIG. 5 is an explanatory diagram showing the penetration of concrete into a joint portion.

FIG. 6 is an explanatory view showing an example of use in which a shaped steel for continuous wall is formed as a box-type steel sheet pile.

FIG. 7 is a perspective view showing a usage state as a composite structure with concrete.

FIG. 8 is an explanatory view showing a shape example of a conventional continuous wall shaped steel.

[Explanation of symbols]

 1 Shaped steel for continuous wall 1A Female joint with narrow opening 1B Female joint with wide opening 6 Connecting member

Claims (1)

[Claims] 1. In a continuous wall shaped steel having female joints on both left and right ends or one end of a web, the opening width of the female joints is such that narrow portions and wide portions are alternately continuous in the longitudinal direction of the shaped steel. A shaped steel for continuous walls, which is characterized by being formed as follows.