JPH04128436A - Underground water discharging method in basement constructing method and reaction pile used for it - Google Patents

Abstract

PURPOSE:To prevent underground water from going inside the walls of a basement by burying a reaction pile in ground and connecting the walls of the basement to this reaction pile, and drawing up underground water through the hollow reaction pile. CONSTITUTION:A reaction pile 5 made of a hollow steel pipe pile is formed, and a spiral-wing 11 for forcing the pile go into the ground is formed on the outer circumference of the lower end of the reaction pile 5. In addition, a lot of water flowing holes 12 are provided on the upper area of the wing 11, and a hose insertion hole 13 is formed near the upper end of the reaction pile 5. In the next step, the head of a water suction hose 15 is inserted into the reaction pile 5 through the insertion hole 13 and is guided to drop to the lower end provided with water flowing holes 12 to draw the underground water flowing into the pile. This constitution can prevent the ground inside the walls of a basement from becoming muddy water state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for draining groundwater in a basement construction method and a basement wall used therein.

Conventional technology As a construction method that allows basement construction to be carried out in a short period of time and even in narrow spaces, the basement walls are assembled on the ground in advance, and the assembled basement walls are pushed into the ground while applying pressure force. Some models are designed to excavate the soil inside the wall at the same time or after entering the wall. Fig. 3 explains the method. In the figure, 1 is a basement wall, and this basement wall is assembled on a lower gop 2 placed along the basement wall and its lower beam 3. It consists of an outer wall part 3 made of precast concrete plates, and a lower beam 4 attached to the upper end of the outer wall part 3. 5 is a reaction pile driven into the ground around which the basement will be constructed; 6 is a press-in assembly installed on the top surface of the lower beam 4; It is connected to the upper end of a reaction pile 5, and while the reaction force is taken by the reaction pile 5, a pressing force is applied by a hydraulic jack 7, and the basement wall 1 is moved underground. Along with this approach, the soil surrounded by the wall is excavated and discharged to the outside.

Problems to be Solved by the Invention In the above construction method, the basement wall l is completely penetrated,
In addition, after excavating the internal soil, reinforcing is placed at the bottom and concrete is poured, so groundwater in the ground around the outer periphery does not enter into the wall 1, but when it enters before that. There is an inconvenience that the groundwater that gushes out at this stage enters the ground, and as a result, the ground inside becomes muddy, making it difficult to perform excavation and earth removal work, as well as publishing concrete 1, pouring, and reinforcing work after entering the site. There were drawbacks. This invention was made with the aim of eliminating such inconveniences by actively discharging groundwater in the surrounding ground during entry work. The purpose is to discharge wastewater without having to carry out large-scale construction work.

Means for Solving the Problems In order to solve the above problems, the method of the present invention is to bury reaction piles in the ground around the basement construction part, and to attach the basement walls assembled on the ground in advance to the reaction piles. In the basement construction method in which the reaction pile is connected to a basement wall and the basement wall penetrates into the ground while taking the reaction force with the reaction pile, the reaction pile is hollow and groundwater is pumped up and discharged through the reaction pile. It is characterized by that.

Similarly, the reaction pile of this invention is buried in the ground around the basement construction part and connected to the basement wall assembled in advance on the ground to support the reaction force when the basement wall is press-fitted. The reaction pile is hollow as a whole and has an opening at or near the upper end into which a water suction hose of a pump for pumping up groundwater is inserted.

Effects According to the present invention, since groundwater is pumped up through the hollow reaction pile, it is possible to prevent groundwater from penetrating into the basement wall. At this time, in the reaction pile of the present invention, groundwater that has entered the reaction pile is pumped up and discharged through the hose of the pump. In addition, since the pile used to absorb the reaction force during press-fitting is used, large-scale construction such as digging a special hole is not necessary.

Embodiment FIG. 1 shows a cross section of a reaction pile 5 in an embodiment of the present invention. A spiral wing is formed for embedding the power pile 5 in the ground. That is, the reaction pile 5 is driven into the ground by the blades at its tip while being rotated, but the present invention is not necessarily limited to this.

A large number of water inflow holes 12 are formed in the upper part of the wing at the lower end of the steel pipe reaction pile 5 along its outer periphery, penetrating the inside and outside of the shaft 5. On the other hand, - hose insertion holes 13 are formed near the upper end of the reaction pile 5 that protrudes above the ground. 14 is a pump installed on the ground, and the tip of its water suction hose 5 is inserted into the reaction pile 5 through the insertion hole 13 and dropped to the lower end where the inflow hole 12 is provided, thereby controlling the inflow. This is to pump up the groundwater flowing in from the hole 12. in this case,
By measuring the level of groundwater inside the reaction pile 5 before installing it and pumping up groundwater, it is possible to know at what stage groundwater will come out before excavation, and if the pump is driven at that stage. It's going to be a good thing.

The reaction piles 5 are usually installed at four locations along the outer periphery of the basement wall 1, and the hoses 15 are inserted into each of the locations to discharge water at a plurality of locations. In this case, it is more effective to provide the basement wall 1 with a structure that guides the groundwater inside to a portion of the basement wall.

Effects of the Invention As described above, according to the present invention, groundwater in the ground outside the wall is pumped up and discharged using the reaction pile used to take up the reaction force at the time of press-fitting. Not only can it prevent the ground inside the wall from becoming muddy, making excavation, earth removal work, and reinforcement work easier, but it also uses reaction piles, which are used in this type of basement construction method. There is no need to dig a special hole like a pothole, and there is no need for large-scale construction. Further, in the reaction pile of the present invention, it is only necessary to insert the suction hose of the pump through the insertion hole provided at or near the above-ground part, and the work for installing the hose is also facilitated.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a reaction pile installation part showing an embodiment of the present invention, and FIG. 2 is an overall vertical sectional view showing a method of constructing a basement. l...Basement wall, 5--Reaction pile, 13--Hose insertion hole, 15--Water absorption hose. Patent applicant Sekisui House Co., Ltd.

Claims (1)

[Scope of Claims] 1. A reaction pile is buried in the ground around the basement construction part, and a basement wall assembled on the ground in advance is connected to the reaction pile, and the reaction force is absorbed by the reaction pile. A method for discharging groundwater in a basement construction method, characterized in that the reaction pile is hollow and the groundwater is pumped up and discharged through the reaction shaft. . 2. Reaction piles that are buried in the ground around the basement construction area and are connected to the basement walls assembled above ground in advance to support the reaction force when the basement walls are press-fitted. A reaction pile for use in a basement construction method, characterized in that the entire structure is hollow, and an opening is formed at or near the upper end into which a water suction hose of a pump for pumping up groundwater is inserted.