JPS6187015A - Method of building steel pipe sheet pile underground outer wall - Google Patents

Abstract

PURPOSE:To improve economical efficiency, by a method wherein, after excava tion for a landslide protection wall by means of steel pipe sheet piles is carried out, the sheet piles are welded to each other to arranged steels and reinforce ment to the inner side of the landslide protection wall, and concrete is placed in a given thickness in the inner side of the landslide protection wall. CONSTITUTION:A ground is excavated at the inside of steel pipe sheet piles 3, and after underground water is pumped up, and a connection between a C-shaped pipe 1 and a T-shaped rail 2 is joined in a direction, extending from a pit excavation bottom toward the upper part, by welding. A doweled stud 4 is welded to the inside of a landslide protection wall employing a sheet piles 3, and after longitudinal and lateral reinforcement 5 is superoposed with the doweled stud 4 for mounting, concrete 6 is a placed in a given thickness. This enables a steel pipe sheet pile landslide protection wall to be utilized as part of a regularily-built underground outer wall, resulting in improvement of econom ical efficiency.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention provides a steel pipe sheet pile retaining wall constructed to prevent ground collapse during ground excavation work. ), and more specifically, it relates to a method of constructing an underground exterior wall that integrally combines steel pipe sheet piles, reinforcing bars, steel frames, and concrete IJ-concrete.

(Prior art and its problems, etc.) When constructing an underground structure, it is necessary to excavate the ground and pump out groundwater in order to obtain the required underground space. For this reason, construction is currently progressing by constructing retaining walls, supporting the earth pressure and water pressure acting on them with struts, etc., and securing space. There are many types of retaining walls, struts, etc., depending on materials and construction methods, and retaining walls made of steel pipe sheet piles are one of them.

By the way, all of the conventional mountain retaining walls were used only as temporary structures, and after they were used they were left behind and never used. However, steel pipe sheet piles are steel products that are manufactured in a factory in an integrated manner. (steel pipe), and is in a higher position in terms of quality and precision than retaining walls made of other materials. It must be said that it would be extremely uneconomical to use such an excellent material merely as a temporary construction material and then leave it as is.

Moreover, constructing a permanent underground outer wall inside the temporary retaining wall increases the total cost and impedes the effective use of the site, which is problematic.

(Object of the invention) Therefore, the object of this invention is to utilize the steel pipe sheet pile as part of an underground outer wall (permanent structure) completely installed.

The object of the present invention is to provide a method of constructing an underground steel pipe sheet pile exterior wall that improves its economic efficiency.

(Structure of the invention FJi) In order to achieve the above object, the method for constructing an underground outer wall of steel pipe sheet piles of the present invention is such that after excavation of piles using steel pipe sheet piles (including steel sheet piles and other similar materials; the same shall apply hereinafter), steel pipes are The process of welding the sheet piles to each other from the inside of the cut surface, the process of attaching the required steel frame (or) reinforcing bars in the required form to the inside of the steel pipe sheet pile retaining wall, and the process of welding the steel pipe piles to the inside of the steel pipe sheet pile retaining wall. The process consists of pouring concrete to a certain thickness.

(Function and effect) First, the problem with using steel pipe sheet piles as permanent underground external walls is that although the steel pipe sheet piles themselves are strong enough to withstand out-of-plane forces such as soil pressure and water pressure, the joints are loose. However, it has insufficient resistance to in-plane forces such as seismic lateral force and shear force, and as a structural material, it is difficult to use as a shear wall or a support wall because it is a unidirectional material.

However, in this invention, steel pipe sheet piles are taken in together with steel frames and reinforcing bars, and are integrated into a composite structure with concrete. For this reason, it exhibits sufficient strength and rigidity not only against out-of-plane forces, but also against in-plane seismic lateral forces, shear forces, etc., and can be used as permanent underground external walls of buildings, retaining walls, earthquake-resistant walls, etc.
Can be used permanently as a supporting wall.

In addition, as a result of attaching steel frames and reinforcing bars to connect the structure with the underground external wall, which was considered a problem in the past, or in combination with steel columns and beams, the problem can be solved depending on the mode. As a result of its use, the utility value and economic efficiency of steel pipe sheet piles, which were previously simply left in the ground, will be significantly increased. Furthermore, there is no waste of space when constructing a permanent underground outer wall inside the temporary retaining wall, which reduces the total cost increase, and makes effective use of the site up to the retaining wall near the boundary line. It demonstrates excellent economic efficiency.

(Example) The underground outer wall of the steel pipe sheet piles shown in Figs. 1 to 3 is a retaining wall made of steel pipe sheet piles 3 driven by connecting a C-shaped pike 1 and a T-shaped pipe 2 as joints. It is constructed using.

That is, after excavating the ground inside the steel pipe sheet pile 3 and pumping out groundwater to obtain the required underground space, on the inside of the root cut surface, from the bottom of the root cut upwards, 1, C-shaped barge 1 and T-type The contact portion with the steel pipe 2 is joined by welding, and the steel pipe sheet piles 3, 3... have a single wall (or membrane) structure. Therefore, this greatly increases the resistance of the steel pipes '&3' to in-plane forces.

Next, Statzipel 4... as shear connectors are welded in the required number and in the required arrangement to the inside of the retaining wall made of steel pipe sheet piles 3..., vertical and horizontal reinforcing bars 5 are stacked and assembled, and concrete 6 of the desired thickness is poured. has been done.

Therefore, the steel pipe sheet piles 3, reinforcing bars 5, and concrete IJ-toro are completely integrated into a composite structure, and a highly rigid underground wall can be obtained by exhibiting the characteristics of each material. Therefore, it can be used as a permanent structural underground outer wall.

In addition, the construction of the steel pipe sheet pile underground wall is completed by repeating the above-mentioned steps in sequence upward at a constant height and constructing over the entire height of the steel pipe sheet pile 3.

By the way, the joint structure of the steel pipe sheet pile 3 has conventionally been the connection of the C-type vigs 1.1 to each other as shown in FIG. Some methods have been used, such as connecting them together, and any of these methods can be constructed in exactly the same way.0 In addition, if there is any concern about the rigidity of the wall structure made of steel pipe sheet piles 3... by simply welding the joints, please refer to Figure 1. As shown by two-dot chain lines, the problem is solved by welding steel plates 8 inserted between the steel pipe sheet piles 3 from the inside of the root cut surface, thereby forming a so-called steel frame structure.

(Second Embodiment) In the case of the underground outer wall of the steel pipe sheet piles shown in FIGS. 6 and 7, the through holes 8 are arranged in horizontal rows on the inside of the cut surface of each steel pipe sheet pile 3...
... is provided, and all of the horizontal stripes 9 are passed through this. Vertical line 10... is
Of each horizontal reinforcement 9..., several reinforcements are arranged at the parts exposed outside the steel pipe sheet piles 3.... Concrete 6 is steel pipe arrow f3...
Concrete is poured to the required thickness on the inside of each steel pipe sheet pile 3..., and concrete is also poured into the hollow part of each steel pipe sheet pile 3...
The rigidity is increased.

In addition, regarding the selectively arranged steel pipe sheet piles 3', these are made to reach the support layer 11 at 1 and are used as support piles. Therefore, this underground outer wall has an effect as a supporting wall.

(Third Embodiment) FIG. 8 shows a combination of a steel pipe sheet pile underground wall and a steel column.

In other words, the steel pipe sheet pile 3" at the column position is used as a flange part of -10,000, and the T-cut steel material 1 is attached to this.
21, and the column reinforcing bars 13 are wrapped around them and concrete is placed to form a pillow shape 14.

Therefore, in this case, the wall thickness of the steel pipe sheet pile 3' to be used as a lunge is adjusted in advance so that it will fit as part of the steel column. In addition, T-cut steel material 1
2, part 15 of the web is
Attach it to the inside of the steel pipe sheet pile 3' in advance.

Just to be sure, when driving the steel pipe sheet pile 3#, it is better to cover a portion 15 of the web with a foil such as an iron plate. This is because if the foil is removed at the time of welding, there is no need for cleaning.

In order to utilize the wall thickness of the steel pipe sheet pile 3'', the column reinforcing bars are assembled by welding both ends of the two 1st reinforcement 13 to the steel pipe sheet pile 3''. Column reinforcing bars may be assembled by welding 7-1 bars 13 to this. (Fourth embodiment) Figure 9 to Figure 11, the steel pipe sheet pile 3 at the column position can be directly attached to the steel column. This shows a case where it is not used as part of a flange, or a means to make the underground outer wall stronger.

That is, the @pipe pile 3 is provided with slit-shaped window holes 16 that allow the web portion of the column steel frame to protrude at a pitch of one foot in the vertical direction of the root cut I) plane.

On the other hand, a vertically elongated approximately hexagonal opening 1 (however, the shape is not limited to this) is formed in the column steel frame 17 at the center of its web.
79... are provided at substantially the same pitch as the annular holes 16, and the center of the web is vertically divided into two.

Then, the -10,000-piece divided body 17 is inserted into the hollow part of the steel pipe sheet pile 3, and its web portion is made to protrude outward through the window holes 16. On the other hand, the other divided body 171 transfers its web to the divided body 17 inside the pipe outside the steel pipe sheet pile 3.
．． The web is butt welded. Therefore, a composite structure in which the steel pipe sheet pile 3 and the column steel frame 17 are completely integrated is obtained. Therefore, by utilizing this, a highly rigid underground structure framework can be constructed.

(Fifth Embodiment) FIG. 12 shows a joint structure between a steel pipe sheet pile underground wall and a beam.

That is, both ends of hoop reinforcements 19 of the beam reinforcing bars are welded to the steel pipe sheet pile 3 (or stacked on a shear connector such as Statzipel) and assembled to the beam type 18 in the middle part of the steel pipe sheet pile 3, and integrated with the underground outer wall. It is formed by pouring concrete.

In addition, the head of the steel pipe sheet pile 3 is covered with a girder 20 to ensure stress transmission. The window holes 16 of the steel pipe sheet pile 3 shown are preferably drilled in advance, and a method of forming the tube body by rolling and welding a flat plate with holes drilled in advance may also be adopted.

[Brief explanation of the drawing]

1 to 3 are a plan view, an elevation view, and a side view showing an underground outer wall of a steel pipe sheet pile being constructed by the method of the first embodiment of the present invention, and FIGS. 4 and 5 are a joint section of a steel pipe sheet pile. Fig. 6 and Fig. 7 are plan views and elevation views showing the steel pipe sheet pile underground external wall constructed by the method of the second embodiment, and Fig. 8 is a plan view showing examples of different configurations of the method of the third embodiment. Plan views showing examples, Figures 9 to 1
Figure 1 is a plan view, front view, and cross-sectional view showing the connection between the steel pipe sheet pile and the steel frame, and Figure 12 is a cross-sectional view showing the connection between the steel pipe sheet pile and the underground outer wall and the beam. Inventor Yuyasu Ikuta

Claims (9)

[Claims] (1) (A) After excavating the piles using the steel pipe sheet piles (3)..., the process of welding the steel pipe sheet piles together from the inside of the cut surface, and (B)
A step of attaching steel frames (12), (17), and reinforcing bars (5) inside the steel pipe sheet pile retaining wall; (c) A step of pouring concrete (6) of the required thickness inside the steel pipe sheet pile retaining wall. , a construction method for an underground steel pipe sheet pile exterior wall. (2) A method for constructing an underground outer wall of steel pipe sheet piles, in which the mutual welding of the steel pipe sheet piles described in claim 1 is performed by welding the steel pipe sheet pile joints (1) and (2). (3) The reinforcing bars (5) described in claim 1 are attached by attaching shear connectors such as Studzipel (4) to the inner side of the cut surface of the steel pipe sheet pile (3), and stacking them on top of this. A construction method for underground steel pipe sheet pile walls by assembling reinforcing bars (5). (4) The attachment of the steel frame (12) described in claim 1 is achieved by attaching a part of the web (15) to the steel pipe sheet pile (3) in advance, and then attaching the web of the steel frame (12) to this. A construction method for underground steel pipe sheet pile walls by welding. (5) Reinforcing bars (9), (
10) is achieved by providing a through hole (8) on the inside of the cut surface of the steel pipe sheet pile (3), passing the horizontal reinforcement (9) through it, and attaching the vertical reinforcement (10) to the horizontal reinforcement (9). A construction method for underground steel pipe sheet pile walls using reinforcement. (6) Beam reinforcing bars (19) described in claim 1
Alternatively, the column reinforcing bars (13) are installed by welding both ends of the hoop bars to the steel pipe sheet piles (3). (7) The attachment of the steel frame (17) described in claim 1 is achieved by dividing the steel frame web into two parts (
17_1) into the hollow part of the steel pipe sheet pile (3), a part of the web protrudes through the window hole (16) provided inside the cut surface of the steel pipe sheet pile (3), and the other divided body (17_2)
The web is inserted into the divided body (1) from outside the steel pipe sheet pile (3).
7_1) A method of constructing an underground steel pipe sheet pile underground wall by bringing it into contact with the web and integrating it by welding. (8) Concrete (
6) is a construction method for underground external walls of steel pipe sheet piles in which the driving is also carried out inside the hollow part of the steel pipe sheet piles (3). (9) The through hole (8) described in claim 5 or the window hole (16) described in claim 7 is a method of forming a tube by rolling a flat plate that has been previously drilled. A method of constructing a steel pipe sheet pile underground external wall that is installed in advance on the steel pipe sheet pile (3) by etc.