KR20090064710A

KR20090064710A - Modifying method of basement slurry wall from one to two way resisting with using wire tensioning

Info

Publication number: KR20090064710A
Application number: KR1020070132009A
Authority: KR
Inventors: 이창남
Original assignee: 이창남
Priority date: 2007-12-17
Filing date: 2007-12-17
Publication date: 2009-06-22

Abstract

The present invention is a method for converting the underground continuous wall that can exert strength in only one direction up and down to a two-way up, down, left, and right support state, the basement floor that resists earth pressure and water pressure from the continuous wall 30 is damaged by the opening. Even in this case, it is a reinforcement method so that the continuous wall can support earth pressure and water pressure. Until now, if there is an opening in the basement floor in the continuous wall, a method of adding a reinforcement wall 60 or installing a horizontal beam 50 inside the continuous wall has been used. ) And tension so that the dynamic structure of the simple bore with the continuous wall is established. When the boundary wall around the opening facing the basement outer wall is used as the sub-axial wall 40, the earth pressure and the water pressure transmitted from the continuous wall are supported.

The steel wire 15 is to attach a fixing end 10 to the expansion bolt 12 by drilling a hole in the position close to the left and right end of the continuous wall, inserting the steel wire to the fixing end and fixing the steel wire to the tension fixing end with a hydraulic jack. This ensures lateral stiffness of the continuous wall without the addition of a separate reinforcement wall 60 or horizontal beam 50 inside the basement continuous wall, thereby smoothing the utilization of the basement plane and reducing construction costs and air.

Description

Modifying method of basement slurry wall from one to two way resisting with using wire tensioning}

The present invention is a method for converting a continuous wall, which is generally used as a basement mud and a basement permanent wall, from a top-bottom one-way support state to a top-bottom, left-right support state. Underground continuous wall 30 is a bar between the left and right unit continuous wall in contact with each other in the construction procedure is not even a single strand of continuous continuous each created as an independent column, just like a parquet floor. Therefore, since it does not receive any bending moment in the horizontal direction, the present invention relates to a construction method for converting steel wire tension to be able to resist bending moment in the horizontal direction.

The continuous wall continuously exchanges and supplies fresh bentonite liquid (mud) in the hollow wall to prevent the hollow wall from collapsing during the drilling of a rectangular cross section in the ground. When the vacant wall reaches a certain depth, the reinforcing steel network assembled from the ground is inserted into the vacant wall, and the concrete is poured through the induction pipe. It is buried vertically in this underground. When one reinforced concrete column is completed, spaced left and right a certain distance to complete another reinforced concrete columns in the ground in the same manner as described above, and then drilled a hole between the left and right reinforced concrete columns in the above-described method to fill the gap between the reinforced concrete columns As a result of the filling process, the continuous wall 30 is repeatedly formed to form a continuous wall shape. The continuous wall method developed in France was first used in the LG building in Yeouido, Seoul, and it is now generalized. Bentonite liquid is buried around the continuous wall, so it acts like a mud, but it does not leak water even if the waterproofing is omitted. Have However, the biggest disadvantage of this method is that, as described above, the bars are separated from each other without connecting a single strand between the left and right rectangular reinforcement concrete pillars, so that water penetrates through the gap and the bending moment in the horizontal direction You cannot receive it.

If the basement floor is blocked without openings throughout the plane, the bottom plate receives the earth pressure or water pressure received by one continuous wall and reliably transmits it to the opposite continuous wall to balance each other and thus become a permanently safe basement. However, in the basement floor, various kinds of holes must be drilled. If the opening is to be provided in contact with the continuous wall, the continuous wall that transmits the earth pressure and water pressure to the bottom plate of each basement floor loses its equilibrium, and the vertical seam is opened in the inner part. Buddhas can be driven into this cellar (Figure 9). Near the basement exterior walls are those that function by damaging the bottom plate, such as vents, equipment inlets, staircases, mechanical car parks, elevators, and ramps. In this case, until now, as shown in FIGS. 6 and 8, the reinforcement wall 60 is added to the inside of the continuous wall for each floor or the horizontal beam 50 is installed so that the horizontal beam delivers the load of the continuous wall 30 to the bottom plate. . However, due to the installation of a huge horizontal beam (50) in the basement prepared for a large amount of hard money, the necessary opening is pushed into the basement or reduced in size, there is a case that there is a difficulty in exercising the function. In addition, as the depth of the basement increases, the earth pressure and water pressure transmitted from the continuous wall often increase, so the horizontal beam often becomes unacceptably large in architectural design.

No matter how thick the underground continuous wall is, the construction process does not allow transverse continuous construction of each rectangular quadrangular column. Therefore, it is a technical problem to provide a method for designing a continuous wall that depends only on the vertical rigidity in both the horizontal and horizontal directions, so that even if an opening is formed in the base plate along the basement outer wall, it can be designed without great burden. Originally, the underground continuous wall has a large thickness (60 to 120 cm), which is a burden in the architectural design, so it is not desirable to reduce the width of the opening by adding a reinforcement wall 60 or a horizontal beam 50 to it. Therefore, the reinforcement method should not add the continuous wall thickness as much as possible. Therefore, the steel wire tension, which is 5 to 6 times stronger than ordinary rebar, is used as a reinforcement method.

In the present invention, in order to solve the difficulties of the existing underground continuous wall by adding the horizontal direction stiffness utilizing the tension of the steel wire (15) to the thick underground continuous wall installed in the past, in the vertical direction as well as in the left and right horizontal direction To be able to support the bending moment (see Fig. 9). Continuous walls are usually thicker than 60cm, 80cm, 100cm, and sometimes 120cm. Therefore, if the width of the opening is not large, arranging the steel wire in the horizontal direction inside the continuous wall and exerting tension to exert its tensile strength, the concrete of the simple beam outside the continuous wall (site facing the soil) will bear the compressive stress. The dynamic composition is established.

The steel wire 15 may be arranged close to the inner surface of the continuous wall, and if the size of the opening has some margin, the continuous wall 30 and the steel wire (by attaching the saddle 20 to the central portion in order to reduce the number of steel wires) You can also increase the distance from 15). In this case, a protective wall of minimum thickness for protecting the steel wire 15 is added. Generally, a boundary wall is required in a direction perpendicular to the continuous wall around the opening facing the basement outer wall. Using this as the minor axis wall 40 is convenient to bear the load transmitted from the continuous wall 30 or the reinforcing wall 60.

If the continual stiffness is given to the continuous wall 30 without the need to add a separate reinforcement wall 60 or the horizontal beam 50 inside the continuous wall 30 to resist the horizontal bending moment, Therefore, the necessary floorboard openings can be easily arranged, which frees up the construction plan and shortens the construction period as well as the construction period.

1 is a plan view of reinforcing the continuous wall of underground with a straight line tension between the right and left anchoring stage,

2 is an elevational view of reinforcing the continuous wall of underground with straight line tension between the right and left anchoring stages,

3 is an elevational view of reinforcing the continuous wall of the underground by giving an angle to the steel wire with a saddle between the left and right fixing ends,

4 is a detailed view of the fixing stage;

5 is a detail view of the saddle;

6 is a plan view of a horizontal beam,

7 is an elevation view of a horizontal beam,

8 is a continuous wall and a horizontal beam,

9 is a plan view before and after reinforcing the underground continuous wall with a straight line tension.

10: settlement stage 11: settlement block

12: expansion bolt 13: steel wire hole

14: steel wire wedge 15: steel wire

20: saddle 30: continuous wall

31: external vertical muscle 32: internal vertical muscle

33: horizontal band rebar 40: buttress wall (Buttress)

50: horizontal beam 60: reinforcement wall

As a means for achieving the technical problem, the horizontal stiffness increase of the underground continuous wall facing the floor opening proposed in the present invention, that is, the method of increasing the bending resistance moment is as follows.

(A) attaching the fixing end to the expansion bolt 12 by drilling a plurality of expansion bolt holes in the vertical direction as shown in FIG. 2 or 3 in the continuous wall 30 near the left and right subaxial walls 40 of the opening;

(B) attaching the two saddles 20 to the center between the left and right fixing ends 10 if there is room in the opening width as shown in FIG. 3 (if the height of the saddle is high, the surface of the continuous wall and the steel wire The space between them is increased, so the effect of reinforcing steel wire is increased);

(C) The steel wire 15 is inserted through the steel wire hole 13 drilled horizontally in the fixing end 10 and the steel wire wedge 14 is inserted into the conical wedge hole formed at the end of the steel wire hole outside the left and right fixing ends in a conventional manner. And generating a compressive stress in a horizontal direction inside the continuous wall by tensioning the steel wire with a hydraulic jack;

(D) Through (C), the horizontal tension force in the continuous wall caused by the earth pressure and the hydraulic pressure acting on the outside of the continuous wall is offset by the compressive force generated by the steel wire so as to equilibrate. Therefore, the unbalanced load due to the basement bottom plate being omitted is transferred to the left and right subshaft wall 40 by changing the direction to the left and right horizontal.

(E) The position of the steel wire at the anchorage end should be closer to the surface of the continuous wall to reduce the burden on the expansion bolt 12. Therefore, the thickness of the fixing end should be thinner as possible, and the minimum thickness of the fixing end for inserting and tensioning the steel wire wedge 14 is 45 mm.

(F) The steel wire mainly uses 15.2mm of 7 stranded wire and the tension of the hydraulic jack is about 15ton, so the thickness and quantity of the expansion bolt 12 should be sufficient to support this value.

(G) Since the bending angle of the steel wire placed on the saddle 20 cannot be increased, the compression force received by the saddle is not large, and the load on the expansion bolt 12 to which the saddle is attached is not very large.

Claims

In the case of constructing the continuous wall 30 on the periphery of the basement in a conventional manner and constructing the basement base plate therein, an opening is formed in the bottom plate adjacent to the continuous wall, thereby losing the balance between earth pressure and water pressure transmission.

(A) attaching the fixing end to the expansion bolt 12 by drilling the expansion bolt holes in the vertical direction close to the left and right subaxial wall 40 of the continuous wall of the bottom plate is removed;

(b) attaching the saddle 20 to a central portion between the left and right fixing ends 10 if there is room in the opening width;

(c) inserting the steel wire 15 through the steel wire hole 13 drilled horizontally into the fixing end and inserting the steel wire wedge 14 into the conical wedge hole formed at the end of the left and right fixing end outer steel wire holes;

(d) tensioning the steel wire 15 with a hydraulic jack with a hydraulic jack to generate a compressive stress in a horizontal direction inside the continuous wall;

The horizontal tension in the continuous wall caused by the earth pressure and water pressure acting on the outside of the continuous wall, including the one-way underground continuous wall with the tension of the steel wire, characterized in that the balance between the compression force generated by the tension of the wire Method to convert to two-way support.