JPH03169911A - Construction of underground steel wall - Google Patents

Abstract

PURPOSE:To improve capacity to bear earth and water pressures and to resist earthquake by driving or erecting unit wall members into or in the ground, and by connecting the adjoining unit wall members by welding, making the members integral with a space formed inside. CONSTITUTION:For a unit wall member 15 provided with a broad plate member 15b on the rear side of a part 15a having a U shape section, brackets 15d are welded on both sides of the front of the part 15a having a U shape section. Connecting parts 15c of the adjoining unit wall members 15 are welded together and a connecting member 16 is placed over the brackets 15d, making the adjoining unit wall members 15 integral. Then the unit wall members 15 are continuously driven into or erected in the ground with positioning made by fitting the connecting parts 15c of the adjoining unit wall members 15 together. Excavation is made with a space corresponding to a basement 11 formed on the inner wall sides of the unit wall members 15. The unit wall members 15 are then connected together by welding same one after another, and the members are made integral in strong struction to serve as an earthquake resisting wall.

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a steel basement wall construction method particularly suitable for forming basement walls.

<<Prior Art>> In recent years, underground structures have been reconsidered as a countermeasure against land shortage, and there is a trend toward deeper and larger scale structures.

By the way, among this type of underground structure, the basement wall structure is
Generally, as shown in Fig. 4, a retaining wall 1 and a basement wall 2 are provided to drain the underground space, and the basement wall 2 is designed to have earthquake resistance. ing.

The retaining wall 1 mainly serves as a retaining and water-stopping function during the excavation process.For example, it is used in the steel sheet pile construction method, in which steel sheet piles are continuously driven into the ground while interlocking their joints, or in the steel sheet pile construction method, in which the steel sheet piles are continuously driven into the ground while interlocking the joints, or they are used to secure the ground while preventing the wall from collapsing. Underground continuous wall construction methods are used, in which a reinforced concrete wall is continuously formed underground by excavating with an excavator, inserting a reinforcing cage, and pouring concrete. Then, the role of the retaining wall 1 was completed by excavating underground and constructing the basement wall 2 of the basement, and it is left as it is. <Problems to be Solved by the Invention> As described above, the conventional retaining wall 1 is only a temporary structure until the basement wall 2 is installed. Therefore, regardless of the structure of the retaining wall 1, the basement wall 2 must have a structure that has soil/water pressure retention performance, seismic resistance, etc., and the construction as a whole requires increased costs and construction work. There was a problem that it became

A conceivable example of this type of basement wall structure is one in which unit wall members made of fJ4 are installed in series in the excavated space, and the unit wall members are integrated with concrete to form an earthquake-resistant wall. In this case, since force is transmitted through different layers of unit wall members and concrete, it is necessary to devise ways to integrate them in order to obtain satisfactory seismic performance.

As a result of studying the design conditions for this type of retaining wall and basement wall, the applicant found that when a continuous steel wall is adopted as a basement wall structure, the retaining wall is the unit wall that will ultimately constitute the basement wall. It was discovered that the conventional materials for retaining walls could be omitted by functioning with members, leading to the present invention.

An object of the present invention is to provide a method for constructing a steel underground wall that can form a highly durable and reliable underground wall economically and in a short period of time.

<Means for Solving the Problems> In order to achieve the above object, the steel underground wall construction method of the present invention provides an underground wall construction method in which long unit wall members made of steel are continuously penetrated or erected into the ground. The installation process, the excavation process of forming a space on the side of the unit wall member that will become the basement, and the integration process of connecting the adjacent unit wall members by welding improve soil/water pressure retention performance and seismic resistance. It is characterized by forming a basement wall with etc.

<<Function>> According to the construction method of the present invention, the unit wall member functions as a retaining wall until the end of the excavation process, and after the unit wall members are integrated by welding, the unit wall member functions as a basement wall. becomes.

In this case, since the integration process is performed after the excavation process, the welding process can be performed while directly viewing the adjacent unit wall members, and since the unit wall members are joined by welding, the top and bottom parts can be assembled as designed. Water pressure retention, earthquake resistance, etc. can be easily improved.

Here, the underground installation process of the present invention is not limited to the method such as the hollow pressing method or the driving method. For example, the underground installation process is not limited to the method of drilling in the ground, or after drilling the ground, and the method involves mixing the compacting material or the compacting material with the original earth and sand. It is also possible to form unit wall members and install them in succession by interposing them. In other words, the specific installation method can be selected as long as it provides a water-stopping function and does not impair the welding work in the integration process. Designed.

In addition, the excavation process is to provide an indoor space inside the unit wall, but for example, as described above, the unit wall member is installed using a compacting material or a mixture of compacting material and raw earth and sand. However, if the welded portion of the unit wall member is covered with a consolidating material or the like, the covering portion is removed to expose the welded portion.

Also, are the unit wall members in the integration process '? Connection methods using a-contact include connecting unit wall members directly, joining separate reinforcing steel members by welding to strengthen the integration, and connecting unit wall members that are connected at intervals. If they are connected to each other, they are connected using a steel connecting member.

In other words, unit wall members! The basement walls made of Il are integrated so that they have the soil and water pressure retention performance and seismic performance as designed.

<<Example>> Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the schematic structure of a basement 11 constructed by applying the present invention. A floor 13, a beam 14, etc., which are provided integrally with each other, are located. Although the explanation of the inner wall side of the basement wall 12 is omitted,
The interior is finished and sometimes decorated with decorative panels.

In addition, the basement wall l2 can be set at any position with respect to the supporting ground, and in addition to the design in which it is in contact with the supporting ground as shown in the same figure, there are also designs in which it is located below the supporting ground, and conversely, it is located on the supporting ground. Good too.

Furthermore, the basement wall 12 is constructed by using a long unit wall member l5 made of steel as shown in FIG. 2, and as shown in FIG. It is a continuous steel wall constructed by integrating process C of 15 pieces.

Here, the unit wall member l5 is designed as shown in FIG.
It has a shape of b.

Both ends of the plate portion 15b have joint portions 15c formed along the elongated direction, and as shown in the figure (opening), underground installation process A
The structure is such that the unit wall members 15 can be penetrated or erected while being positioned through the joints 15C.

In addition, receiving brackets 15d are welded to both front sides of the U-shaped section 15a in opposition to the plate portion l5b, and the joints 15c are welded and each bracket is The unit wall members 15 can be integrated by overlapping the connecting members 16 made of steel plates on the connecting members 15d and welding the overlapping portions of the connecting members 16.

In addition, the welding work of the connecting member l6 is performed at the joint part 1 as described later.
This is done after the 5c are joined together by welding.

Next, the concrete procedure of the steel underground wall construction method of the present invention will be explained with reference to FIG.

In addition, at the design stage, as in the past, based on geological surveys, we considered both the condition as a retaining wall and the condition as a basement wall depending on the structure, and taking into account the bearing capacity and depth of the ground, etc. The mechanical design of the unit wall member 15 has been made, and whether the unit wall member 15 should be continuously driven into the ground during underground installation work or whether it should be built into a hole excavated with a drilling machine or the like. etc. are determined. The underground installation process A is a work in which unit wall members 15 are continuously penetrated or erected into the ground. The unit wall member l5 is
They are installed continuously at a predetermined depth in the ground using a method selected at the design stage, such as the hollow pressing method or the driving method. In this case, as shown in FIG. 2 (opening), the joint portions 15c of the unit wall members 15 are fitted and positioned. Due to this fitting, the unit wall members 15 are connected to each other and have a water stop function.

The excavation process B is a work of forming a space corresponding to the basement l1 on the inner wall side of the unit wall member 15. The excavation work itself is performed in the same manner as before. In addition, here, by considering the construction method, if necessary, by lowering the underground water level using the well point construction method, etc., the water stop function of the unit wall members 15 installed in the underground installation process A is supplemented as described above. You can.

The integration process C is a process of welding together the unit wall members 15 installed in the underground installation process A.

In this welding operation, first, the joint parts 15c are joined while directly viewing the fitting parts. Next, as shown in FIG. 2 (opening), the connecting members 16 are placed on each bracket 15d, and the overlapping parts of the connecting members 16 are welded to make the unit wall members 15 strong as earthquake-resistant walls. be integrated.

In this case, if welding on the side of the joint 15c is omitted, or if the unit wall members 15 are provided with a distance between them in the underground installation process A, a single or multiple steel connecting members may be used. They may be integrated by welding.

Further, it is preferable that the welded portion be treated in advance by an appropriate method.

The basement wall 12 constructed in this way is constructed in the excavation process B.
During this period, the unit wall members 15 function as retaining walls, and after the unit wall members 15 are joined together in the integration step C, they are formed as continuous steel walls.

Therefore, the present invention allows the retaining wall to be used completely in the main body, making it unnecessary to use materials for conventional retaining walls, making it highly economical, and at the same time greatly shortening the construction period. Moreover, since the integration process C is performed after the completion of the excavation process B for conventional concrete-based continuous walls, welding can be performed while directly viewing the joints between the unit wall members 15, and the workability is good. Since the wall members 15 are joined together by welding, soil/water pressure retention and seismic resistance can be reliably obtained. In addition, the steel underground wall construction method of the present invention includes, for example,
The unit wall member can be modified or developed in various ways within the scope of the invention, such as by constructing two or more unit wall members joined together in the length direction, or by changing the specific shape of the unit wall member.

<<Effect>> As explained above, fI4il! of the present invention! In the basement wall construction method, the unit wall members are used as retaining walls during construction and ultimately become basement walls, so construction costs and construction times can be greatly improved, and conventional retaining wall materials are not required. Therefore, it can also contribute to the effective use of materials.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a basement structure with a basement wall constructed by applying the present invention, FIGS. FIG. 3 is a process diagram showing the above-mentioned wall construction procedure, and FIG. 4 is a schematic sectional view of a retaining wall and a basement wall shown as a conventional example. 11... Basement l2... Basement wall 15... Unit wall member

Claims (1)

[Claims] (1) An underground installation process in which a long unit wall member made of steel is continuously penetrated or erected into the ground, an excavation process in which a space is formed on the side of the unit wall member that will become the basement, and the adjacent A steel basement wall construction method characterized by forming a basement wall that has soil and water pressure retention performance, seismic resistance performance, etc. by an integration process in which unit wall members are connected by welding.