JP2002206232A - Groundwater drainage well and execution method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a groundwater drainage well and an execution method therefor, which enables smooth execution during excavation by means of the drainage well while dispensing with a boring machine exclusive to the drainage well by avoiding the installation of the drainage well on an excavation site within an earth retaining wall, and which facilitates the removal of the drainage well after the termination of drainage. SOLUTION: The groundwater drainage well comprises a catchment device 9 and a filter material 10 infilled around a soldier beam 1. The catchment device 9 is installed in a gap 8 formed by the soldier beam 1 of the earth retaining wall, which is composed of a wide flange shape 2 whose end undergoes consolidation of foundation, the upper end of the consolidation-of-foundation part 5 of the shape 2, flanges 6 and 6, and a web 7. The catchment device 9 characteristically comprises a well pipe 12 with a screen and a lifting pump 12 installed within the well pipe 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a groundwater drainage well and a method of constructing the same, and more particularly, to a groundwater drainage well in which installation of a drainage well at the time of excavation is avoided from an excavation site in a retaining wall.

[0002]

2. Description of the Related Art The ground structure for constructing a structure is composed of a permeable layer such as a diluvial or an alluvial layer, which easily penetrates groundwater, and a low permeable soil layer. The groundwater in the aquifer containing a large amount of groundwater in the permeable layer is flowing as a water stream having a certain gradient.

On such ground, as shown in FIG.
When a structure with a long construction section such as a road is constructed and the construction extends to the underground and constructs an underground structure, it is necessary to have a high water stoppage, a short construction period, a low price and a deep wall, etc. Mountain retaining walls are often applied.

Conventionally, drainage of groundwater at an excavation site of an underground structure is performed, as shown in FIG. 7, by retaining retaining walls 21 and 21 'on the upstream side and the downstream side of the ground where the underground structure is constructed. Side to block the groundwater flow 23 in the aquifer 22 and then to the aquifer 24 in the walls of the cutoff walls 21, 21 '.
This is done by arranging drainage wells 25, 25 in the corresponding portions.

The drain well 25 is composed of a well pipe 26 with a screen installed in the ground and a pump 27 inserted and disposed inside the well pipe 26. The water level 28 of the mountain is lowered so that excavation can be smoothly promoted.

However, in the conventional method, it is necessary to use a dedicated drilling machine to construct the drain well 25, so that not only the construction cost is increased, but also the construction of the excavated ground is not performed. Also, the mountain retaining walls 21, 21 '
The problem of disposing drain wells 25 and 25 in a narrow excavation site surrounded by is that it becomes a hindrance to excavation and it takes time to remove the drain well even after drainage of the excavation site has been completed. The point was pointed out.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been proposed in order to solve the problems. The installation of a drain well is avoided from an excavation site in a retaining wall. This eliminates the need for a drilling machine dedicated to drainage wells, and facilitates construction during use excavation, and also facilitates removal of drainage wells even after drainage of the excavation site has been completed. It provides groundwater drainage wells and their construction methods.

[0008]

SUMMARY OF THE INVENTION A groundwater drainage well according to the present invention is provided in a gap formed by a parent pile of a retaining wall made of an H-shaped steel whose tip is solidified, an upper end of the H-shaped steel consolidation, a flange and a web. And a filter filled around the parent pile. The water collection device is characterized by comprising a well pipe with a screen and a water pump installed in the well pipe.

[0009] This makes it possible to carry out the construction smoothly and at low cost without using a drilling machine dedicated to the drainage well and installing the drainage well at the excavation site inside the retaining wall. The drain well can be easily removed even after the drainage of the drainage is completed, without restricting the construction of the underground structure.

The method for constructing a groundwater drainage well according to the present invention comprises drilling a wall hole of a retaining pier, inserting an H-beam into the drilled hole, and then consolidating the parent pile. Position the well tube with screen in the gap formed by the H-section steel flange and the web, located at the upper end of the compaction,
A pump is installed in the well pipe and the filter is filled around the parent pile, and the drain well can be installed without affecting the excavation site in the retaining wall without the need for a dedicated drilling machine. Even after drainage of the excavation ground is completed, the drainage well can be easily removed without restricting the construction of the underground structure.

Further, the method of constructing a groundwater drainage well according to the present invention also includes a method of cutting an H-shaped steel in which a well hole with a screen is disposed in a gap formed between a flange and a web by drilling a wall hole of a retaining pier. The parent pile is constructed by inserting it into the hole and solidifying it.After that, a pump is installed in the well pipe, and the filter is filled around the parent pile. It can be installed with improved workability without affecting the excavation site inside the retaining wall, and can be easily drained even after the drainage of the excavation site is completed without restricting the construction of the underground structure Wells can be removed.

In addition, each of the methods for constructing a groundwater drainage well according to the present invention is characterized in that after the H-shaped steel inserted into the drilled hole is solidified to form a parent pile, the hole wall of the retaining hole is washed. In this way, clogging of the hole wall is eliminated to maintain the drainage efficiency of groundwater.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
A parent pile of a retaining wall made of H-shaped steel having a solid tip,
It consists of a water collecting device installed in the gap formed by the upper end, the flange and the web of the foundation of the section steel, and a filter filled around the parent pile.The water collecting device is installed in the well pipe with screen and the well pipe. And a lift pump to be used. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view and a plan sectional view showing a partially cutaway groundwater drainage well according to the present invention.

In this embodiment, a parent pile horizontal sheet pile method is used to construct a retaining wall, and a parent pile 1 used in the method is made of H-shaped steel 2. The H-section steel 2 is inserted into a retaining wall hole 4 drilled in the ground 3, and forms a rooting part 5 at the bottom end thereof to root the parent pile 1.

The upper end of the rooted portion 5 of the H-section steel 2 and the H-section steel 2
A water collecting device 9 is installed in a gap 8 formed by the flanges 6 and 6 and the web 7, and a filter material is provided around the H-shaped steel 2 and the parent pile 1 including the gap 8. 10 are filled.

The water collecting device 9 is composed of a well tube 12 with a screen provided with a screen 11 at the lower end and a pump 13 installed inside the well tube.
It is configured to be able to drain groundwater on the side of the excavated ground partitioned by the retaining wall through a pumping pipe 14 connected to the ground.

The above-described filter material 10 is arranged so that dust such as soil from the hole wall diffused into the drilled retaining wall hole 4 is not sucked by the pump 13 together with the underground water and the screen 11 is clogged. Is what is being done.

As described above, since the groundwater drainage well according to the present invention is installed in the parent pile constituting the retaining wall, a conventional drilling machine for drilling a conventional drainage well is used. Since the drainage well is not installed at the excavation site inside the retaining wall, the ground inside the retaining wall can be excavated smoothly without hindrance. Even after the completion of the construction, the drain well can be easily removed without restricting the construction of the underground structure.

Next, a method for constructing a groundwater drainage well according to the present invention will be described. The method of constructing a groundwater drainage well according to the present invention comprises forming a parent pile by drilling a wall hole of a retaining pier, inserting an H-shaped steel into the drilled hole, and then consolidating the pile. Then, after a well pipe with a screen is arranged in a gap formed by the flange of the H-section steel and the web, a water pump is installed in the well pipe, and a filter is filled around the parent pile.

An embodiment of a method for constructing a groundwater drainage well according to the present invention will be described below with reference to the drawings.

2 to 4 are a perspective view and a plan sectional view showing a method of constructing a groundwater drainage well according to the present invention in accordance with each step.

FIG. 2 shows a construction process of the parent pile. In the present embodiment, the parent pile 1 is made of the H-shaped steel 2.
In order to construct the parent pile 1 constituting the retaining wall, the retaining wall hole 4 is drilled in the ground 3 with an auger, and the impervious layer 15 located below the aquifer constituting the ground 3 is formed. By reaching the retaining wall hole 4, the groundwater flow is cut off and groundwater in the excavated ground is specified.

H-shaped steel 2 constituting parent pile 1 of retaining wall
Is inserted after drilling the retaining wall hole 4 in the ground 3, and thereafter, a root fixing portion 5 is formed at the bottom end of the parent pile 1 in order to root the parent pile 1.

FIG. 3 shows the first half of the process of installing the water collecting device after the construction of the parent pile. The water collecting device 9 has a well tube 12 with a screen having a screen 11 at the lower end.
In the process for installing the water collecting device on the parent pile 1, after the parent pile 1 is solidified, the solidification portion 5 of the H-section steel 2 is formed.
And a well tube 12 with a screen is placed in a gap 8 formed by flanges 6 and 6 and a web 7 constituting the H-section steel 2.

In this step, since there is a possibility that clogging of the hole wall has occurred in the retaining wall hole 4 drilled by the auger, swabbing of the hole wall is performed to prevent this clogging. Since it is desirable to wash by jetting or jetting, it is appropriately adopted as necessary.

FIG. 4 shows the latter half of the process of installing the water collecting device. After the well pipe 12 with a screen is installed on the parent pile 1, the filter material 10 is filled around the parent pile 1 including the H-section steel 2 and the gap 8. Thereby, it is possible to prevent dust such as soil diffused into the groundwater in the retaining wall hole 4 from penetrating into the well pipe 12 with the screen, thereby forming clogging of the screen.

After the well tube 12 with the screen is installed, a pump 13 is inserted into the inside thereof to constitute the water collecting device 9. A pumping pipe 14 is connected to a pump 13 disposed inside the well pipe 12 with a screen, and groundwater on the excavated ground side partitioned by a retaining wall can be drained through the pumping pipe 14 by operating the pump 13. It is configured as follows.

The periphery of the parent stake 1 is filled with the filter material 10. The time for filling the filter stake 10 is after the well pipe 12 with the screen is installed on the parent stake 1.
It can be constructed regardless of before and after arranging the pump 13 in the well pipe 12 with the screen, whereby dust such as soil diffused into the groundwater of the retaining wall hole 4 is sucked by the pump 13 together with the groundwater. Also, the screen 11 can be configured so as not to be clogged.

The construction method of the groundwater drainage well according to the present invention is as follows.
With the above configuration, a dedicated drilling machine for drilling drain wells is not required, construction costs can be reduced, and underground structures can be maintained even after drainage of the excavation site has been completed. The drainage well can be easily removed without any restrictions on the construction.

The method for constructing a groundwater drainage well according to the present invention can be configured in a manner other than the above-described embodiment.

In another embodiment of the construction method according to the present invention, an H-shaped steel in which a well pipe with a screen is arranged in a gap formed by a flange and a web is inserted into the hole, and a wall hole of a mountain retaining is drilled. After that, the parent pile is constructed by solidification, and then a pump is installed in the well pipe to fill the filter around the parent pile.

Hereinafter, another embodiment of the construction method according to the present invention will be described with reference to the drawings. 5 and 6 are a perspective view and a plan sectional view showing another construction method of the groundwater drainage well according to the present invention according to each step.

FIG. 5 shows the first half of the process of constructing the parent pile. Also in the present embodiment, the parent pile 1 is made of H-shaped steel 2, and in order to construct the parent pile 1 constituting the mountain retaining wall, a mountain retaining wall hole 4 is formed in the ground 3 with an auger as shown in the figure. ing.

H-shaped steel 1 constituting parent pile 1 of retaining wall
5 is inserted after drilling the retaining wall hole 4 in the ground 3, but at a position corresponding to the upper end of the rooting portion 5 of the H-section steel 15;
A well pipe 12 with a screen is provided in advance in a gap 18 formed by the flanges 16 and 16 constituting the H-section steel 15 and the web 17.

FIG. 6A shows the latter half of the process of constructing the parent pile. The H-shaped steel 15 inserted into the retaining wall hole 4 drilled in the ground 3 forms a stiffening portion 5 for staking the parent pile 1 below the well pipe 12 with a screen at the bottom end. I have. In this way, the parent pile 1 blocks the flow of the groundwater flow by solidifying the impervious layer 15 located at the lower part of the aquifer constituting the ground 3 by reaching the retaining wall hole 4. Groundwater in the excavated ground.

FIG. 6B shows a process of installing a water collecting device on the parent pile. Similarly to the above embodiment, since the water collecting device 9 is composed of the well pipe 12 with the screen already installed and the pump 13 installed therein, the water collecting device is installed on the parent pile 1. For this purpose, after solidifying the parent pile 1, the pump 13 is inserted into the well pipe 12 with the screen to constitute the water collecting device 9.

A pump 13 arranged inside the well pipe 12 with a screen is connected to a pumping pipe 14 in the same manner as in the above embodiment, and groundwater on the side of the excavated ground partitioned by the retaining wall is pumped. It is configured such that the drainage through the pumping pipe 14 can be performed by the operation of 13.

In this step, the hole walls are cleaned in the same manner as in the above embodiment, thereby preventing the clogging of the retaining wall holes 4 drilled by the auger.

The periphery of the parent pile 1 is filled with the filter material 10 regardless of before and after the pump 13 is disposed in the well pipe 12 with the screen, and the soil which is diffused into the groundwater of the retaining wall hole 4. Even if dust such as is sucked together with the groundwater by the pump 13, the screen 11 is prevented from being clogged.

The construction method of the groundwater drainage well according to the present invention is as follows.
With the above configuration, it is not necessary to use a special drilling machine for drilling a drainage well, and it is possible to improve the workability while keeping the construction cost inexpensive and install it. Even after the drainage is completed, the drainage well can be easily removed without any restrictions on the construction of the underground structure.

Although the present invention has been described in detail with reference to the embodiment, the groundwater drainage well and the method of constructing the same according to the present invention are not limited to the above-described embodiment. It goes without saying that various modifications can be made to the basic structure and the construction method thereof without departing from the spirit of the present invention.

[0043]

The groundwater drainage well according to the present invention is a water collecting device which is installed in a gap formed by a parent pile of a retaining wall made of H-shaped steel whose tip is solidified, an upper end of the H-shaped steel consolidation, a flange and a web. And a filter filled around the parent pile, and the water collecting device is characterized by comprising a well pipe with a screen and a pumping pump installed in the well pipe. Is showing. Eliminates the need for special drilling machines for groundwater drainage wells. The construction can be performed smoothly and at low cost without installing a drain well at the excavation site inside the retaining wall. After drainage of the drainage well is completed, the drainage well can be easily removed without restricting the construction of the underground structure.

The method for constructing the groundwater drainage well according to the present invention is as follows.
The parent pile is constructed by drilling the hole in the retaining wall, inserting the H-shaped steel into the drilled hole, and then bolstering it. A well pipe with a screen is placed in the gap, and then a pump is installed inside the well pipe to fill the filter around the parent pile. It can be installed without affecting the excavation site in the wall, and also has the effect of easily removing the drain well without restricting the construction of the underground structure even after the drainage of the excavation site is completed.

In addition, the method of constructing a groundwater drainage well according to the present invention also includes cutting an H-section steel in which a well hole with a screen is arranged in a gap formed by a flange and a web by drilling a wall hole of a retaining pier. The parent pile is constructed by inserting it into the hole and solidifying it.After that, a pump is installed in the well pipe and the filter is filled around the parent pile, so in addition to the above functions, It has the effect of further improving workability.

Further, each of the construction methods of the groundwater drainage well according to the present invention is characterized in that after the H-shaped steel inserted into the drilled hole is solidified to form the parent pile, the hole wall of the retaining hole is washed. Therefore, in addition to the above effects, the effect of eliminating clogging of the hole wall and maintaining the drainage efficiency of groundwater is exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view and a plan sectional view of a groundwater drainage well according to the present invention.

FIG. 2 is a construction process diagram of a parent pile in a construction method of a groundwater drainage well according to the present invention.

FIG. 3 is a process diagram of the first half of installing a water collecting device in the method of constructing a groundwater drainage well according to the present invention.

FIG. 4 is a process diagram of the latter half of constructing a water collecting device in the method of constructing a groundwater drainage well according to the present invention.

FIG. 5 is a first half process diagram of constructing a parent pile in another method of constructing a groundwater drainage well according to the present invention.

FIG. 6 is a process diagram of the latter half of constructing a parent pile in another construction method of a groundwater drainage well according to the present invention (a) and a process diagram of constructing a water collecting device (b).

FIG. 7: Installation diagram of a conventional drainage well for groundwater

[Explanation of symbols]

1 Parent pile, 2 H-section steel, 3 Retaining ground, 4 Retaining wall hole, 5 Root, 6 flange, 7 web, 8 gap, 9 water collecting pipe, 10 filter material,
11 screen, 12 well tube with screen,
13 pump, 14 pumping pipe, 15 H-section steel, 16
Flange, 17 web, 18 gap, 21, 2
1 'Retaining wall, 22 aquifer, 23 groundwater flow, 24 aquifer, 25 drain well, 26 well pipe, 27 pumping pump, 28 water level,

Claims (5)

[Claims] 1. A water collecting device installed in a gap formed by an upper pile, an upper end, a flange and a web of a rock retaining wall made of an H-shaped steel having a solidified tip and a periphery of the water collecting device. Groundwater drainage well composed of filters to be filled. 2. The groundwater drainage well according to claim 1, wherein the water collecting device comprises a well pipe with a screen and a water pump installed in the well pipe. 3. A parent pile is formed by drilling a hole in a wall of a mountain retaining, inserting an H-shaped steel into the drilled hole, and then consolidating the pile. After that, the parent pile is positioned at the upper end of the consolidation. A well pipe with a screen is disposed in a gap formed by the flange and the web, and then a pump is installed in the well pipe to fill a filter around the parent pile. 4. The parent pile is drilled by drilling a hole in the wall of the retaining pier, inserting an H-shaped steel in which a well pipe with a screen is arranged in a gap formed by the flange and the web, and solidifying the hole. A method for constructing a groundwater drainage well in which a pump is installed in the well pipe and a filter is filled around the parent pile. 5. A method for constructing a groundwater drainage well according to claim 3, wherein after the H-section steel inserted into the borehole is solidified to form a parent pile, the hole wall of the retaining hole is washed. .