JP2012177277A - Groundwater catchment structure and groundwater conduction structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a groundwater catchment structure and a groundwater conduction structure which have less impact on a construction period.SOLUTION: In a groundwater catchment structure, an earth retaining wall 13 configured by a solidification material 14 and steel core materials 15 arranged inside the solidification material at a prescribed interval is constructed in a manner that divides an underground permeable layer to collect groundwater through a gap between an internal earth retaining wall at an excavation side and the underground water permeable layer. The groundwater catchment structure uses a water catchment device 11 which has: a steel water catchment box 21 with an opening section on one face; a screen pipe (a screen section) 23 arranged inside the steel water catchment box; and a first communication hole 24 installed inside the steel water catchment box so as to be communicated with the screen pipe. The steel water catchment box is fixed to the earth retaining wall in a manner that makes the opening section thereof face the internal earth retaining wall with a peripheral portion thereof fixed thereto at a depth where the opening section can be placed in the underground water permeable layer. The first communication hole of the steel water catchment box can be connected with a water passage pipe 33.

Description

  The present invention relates to a groundwater collection structure and a groundwater flow structure.

  When building a structure with a long extension, such as a box culvert, the retaining wall obstructs the flow of groundwater, causing a phenomenon like a subsurface dam, where the groundwater rises upstream and the water level falls downstream.

  In order to solve such a problem of groundwater, for example, the technique of Patent Document 1 is disclosed. Although the technique of this patent document 1 is suitable for letting the groundwater in the permeable layer located deeper than the underground structure, the groundwater in the permeable layer having the same depth as the underground structure is allowed to flow. Has a problem that the apparatus is large and the construction cost increases.

  Therefore, as a method of allowing groundwater to flow with a simple configuration (cheap), water drainage holes (soil cement continuous walls and mortar pile column walls) on the upstream and downstream sides of the horizontal boring are provided. At the same time, a construction method in which a water pipe is installed in the wall is known.

JP 2000-87380 A

  However, in the above-mentioned groundwater countermeasures, when water is passed through the shallow layer, it is necessary to provide a water hole in the open earth retaining wall being constructed by horizontal boring or the like, and construction after the building is impossible. In other words, there is a problem that the construction period is affected because it is necessary to perform a large-scale construction before the building construction.

  Then, this invention is made | formed in view of the said situation, and provides the groundwater collection structure and groundwater water flow structure which are hard to influence a construction schedule.

  In order to solve the above-mentioned problems, the invention described in claim 1 is characterized in that a retaining wall made of a solidified material and a steel core disposed in the solidified material at a predetermined interval divides the underground water permeable layer. A steel water collection box constructed to collect groundwater between the excavation side inside the retaining wall and the underground permeable layer, and having an opening formed on one side thereof A water collecting device comprising: a screen portion disposed inside the steel water collecting box; and a first communication hole formed in the steel water collecting box so as to communicate with the screen portion, The steel water collecting box has the opening at the depth position of the underground permeable layer and is opposed to the inside of the earth retaining wall, and the peripheral edge of the opening is fixed to the earth retaining wall, A water pipe is connectable to the first communication hole of the water collecting box.

  According to the invention described in claim 1, by installing a water collecting device on the wall surface of the retaining wall during or before the construction of the structure body, the construction of the subsequent groundwater flow structure and the structure work of the structure Can work in parallel. Therefore, it is difficult to affect the frame construction, and the construction period can be shortened.

  In the invention described in claim 2, a second communication hole is formed on the upper surface of the steel water collecting box to allow insertion of a high-pressure injection device used for cutting the solidified material of the retaining wall. It is a feature.

  According to the second aspect of the present invention, cutting of the solidified material of the retaining wall can be performed by inserting the high-pressure injection device from the steel water collection box side. Therefore, the solidified material can be easily cut into a desired shape with a simple configuration by simply forming the second communication hole in the steel water collection box.

  The invention described in claim 3 is a groundwater flow structure using the groundwater catchment structure according to claim 1, wherein at least by the high-pressure jet from a cavity formed in the retaining wall. A solidified material portion of the wall is cut to form a cutting hole for communicating the water collecting device and the underground water permeable layer, and the cutting hole and the steel water collecting box are filled with a filter material, It is characterized in that water can pass between the water permeable layer and the water collecting device.

  According to the third aspect of the present invention, the retaining wall can be cut during or after the construction of the structural body, so that the construction work is hardly affected and the construction period can be shortened.

  According to a fourth aspect of the present invention, there is provided a groundwater drainage structure using the groundwater catchment structure according to the second aspect, wherein the high-pressure jet is inserted into the steel drainage box from at least the second communication hole. The solidified material portion of the retaining wall is cut by high-pressure spraying by a device to form a cutting hole that connects the water collecting device and the underground water permeable layer, and a filter is formed in the cutting hole and the steel water collecting box. It is characterized by being filled with a material and allowing water to pass between the underground permeable layer and the water collecting device.

  According to the invention described in claim 4, since the retaining wall can be cut during or after the building of the structure, it is difficult to affect the frame work and the work period can be shortened. And when cutting the solidification material of a retaining wall, since a high pressure injection device is inserted from the steel water collecting box side, the solidification material can be easily cut.

  According to the groundwater collection structure and the groundwater flow structure of the present invention, the construction of the subsequent groundwater flow structure can be performed by providing a water collecting device on the wall surface of the retaining wall during or before the construction of the structure frame Work can be done in parallel with the construction of the structure. Therefore, it is difficult to affect the frame construction, and the construction period can be shortened. In addition, since the retaining wall can be cut during or after the construction of the structural body, the work period can be shortened.

It is a flowchart which shows the construction procedure of the groundwater water-flow installation in embodiment of this invention. It is a schematic side view (state of S1 of a flowchart) which shows a groundwater collection structure in an embodiment of the present invention. It is a schematic plan view which shows the state of FIG. It is a schematic perspective view of the groundwater collection structure which shows the state which attaches the water collection apparatus of FIG. It is the perspective view which looked at the water collecting apparatus in embodiment of this invention from the surface side. It is the perspective view which looked at the water collecting apparatus in embodiment of this invention from the back surface side. It is a schematic side view (state of S2 of a flowchart) which shows a groundwater collection structure in an embodiment of the present invention. It is a schematic side view (state of S3 of a flowchart) which shows the construction procedure of the underground water flow structure in embodiment of this invention. It is a schematic side view (state of S4 of a flowchart) which shows the construction procedure of the groundwater flow structure in the embodiment of the present invention. FIG. 10 is a schematic plan view showing the state of FIG. 9. It is a schematic side view (state of S5 of a flowchart) which shows the construction procedure of the groundwater flow structure in the embodiment of the present invention. It is a schematic side view (state of S6 of a flowchart) which shows the construction procedure of the groundwater flow structure in the embodiment of the present invention. It is a schematic side view (state of S7 of a flowchart) which shows the construction procedure of the groundwater flow structure in the embodiment of the present invention. It is a schematic plan view which shows the state of FIG. It is a schematic side view (state of S8 of a flowchart) which shows the construction procedure of the groundwater flow structure in the embodiment of the present invention. It is a schematic plan view which shows the state of FIG. It is a schematic side view (state of S9 of a flowchart) which shows the construction procedure of the groundwater flow structure in the embodiment of the present invention. It is a schematic side view (state of S10 of a flowchart) which shows the construction procedure of the underground water flow structure in the embodiment of the present invention. It is a schematic plan view which shows the state of FIG. It is the schematic (state of S11 of a flowchart) which shows the construction procedure of the groundwater flow structure in embodiment of this invention. It is the schematic which shows another aspect of the groundwater flow structure in embodiment of this invention.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flowchart showing a construction procedure from the groundwater collection structure according to the present embodiment to the groundwater flow facility through the groundwater flow structure. The construction procedure of the groundwater water flow facility 200 (see FIG. 20) will be described with reference to the flowchart of FIG. In the following construction procedure, in the construction of the underground structure 1, the earth retaining wall 13 divides the underground permeable layer 17 around both outer sides of the underground structure 1 to block the flow of groundwater. The construction will be described from the state where excavation inside the retaining wall where the underground structure 1 is constructed is completed. In addition, the groundwater water flow facility 200 in this embodiment includes the groundwater water flow structure 100, and the groundwater water flow structure 100 includes the groundwater water collection structure 10.

  First, as shown in FIGS. 2 to 4, in step S <b> 1, predetermined upper and lower portions of the steel water collection box 21 (detailed later) and the steel water collection box 21 of the water collection device 11 of the groundwater collection structure 10. The steel plate 12 for protecting the retaining wall is attached to the wall surface 13a of the retaining wall 13 in the range. This will be described in detail below.

  The earth retaining wall 13 is an underground continuous wall composed of a solidified material 14 and a steel core material 15 disposed in the solidified material 14 at a predetermined interval. The position of the underground permeable layer 17 is assumed in advance by survey boring, and when the inside of the retaining wall 13 is excavated, the position of the underground permeable layer 17 can be actually confirmed. Therefore, this position is confirmed after excavation, and the installation position of the steel water collecting box 21 on the wall surface 13a of the retaining wall 13 located on the upstream side and the downstream side in the running water direction is determined. Then, the solidified material 14 is substantially flush with the surface of the flange 15a of the steel cores 15 and 15 up to near the ground above the planned location of the steel water collecting box 21 and to about 2 m below the lower end of the steel water collecting box 21 below. Scraping is performed in series including the planned installation position of the steel water collection box 21 so that at least the solidified material 14 does not protrude from the flange surface (soil retaining wall surface smoothing step).

  Next, a steel water collection box 21 is installed. This installation position is a position where the upper end of the steel water collection box 21 corresponds to the depth position of the underground water permeable layer 17 in consideration of fluctuations in the groundwater level in advance. It is determined to be lower than the lowest groundwater level. And the opening part 22 of the steel water collection box 21 faces the inner side of the earth retaining wall 13, and the peripheral part is weld-fixed to the steel core materials 15 and 15 which adjoin the earth retaining wall 13 (water collector installation process) ).

  Subsequently, an iron plate 12 for protecting the retaining wall is installed above and below the steel water collection box 21. Specifically, the iron plate 12 is attached so as to block the exposed portion of the solidified material 14 that has been cut in the earth retaining wall smoothing step. The iron plate 12 has a width dimension spanned between the flanges 15a of the adjacent steel core members 15 and 15, and the side edges of the iron plate 12 are fixed to the flanges 15a of the steel core members 15 and 15 by welding. To do. In addition, the iron plates 12, 12 arranged in the vertical direction (when the iron plate 12 is divided into a plurality of pieces) and between the iron plate 12 and the steel water collecting box 21 are also fixed by welding. Further, when a gap is formed between the iron plate 12 and the solidified material 14 when the iron plate 12 is fixed by welding, it is desirable to fill the gap with mortar.

  Here, the water collecting apparatus 11 will be described. As shown in FIGS. 5 and 6, the water collecting apparatus 11 is a rectangular parallelepiped-shaped steel water collecting box 21 in which an opening 22 is formed on one surface facing the inner side (excavation side) of the retaining wall 13. The steel water collecting box 21 is formed on the upper surface 21a of the steel water collecting box 21 so as to communicate with the inside of the screen tube 23 and the screen pipe (screen portion) 23 disposed from the upper end to the lower end of the steel water collecting box 21. The 1st communicating hole 24 and the 2nd communicating hole 25 which can insert the high-pressure jet nozzle 31 (refer FIG. 13) used in order to cut the solidification material 14 of the earth retaining wall 13 are provided. The first communication hole 24 is formed in the vicinity of the end portion in the width direction of the steel water collection box 21, and the second communication hole 25 is formed in the approximate center in the width direction of the steel water collection box 21. Further, the first communication hole 24 is configured so that a water pipe 33 can be connected, and the second communication hole 25 is a guide for facilitating insertion of the high-pressure jet nozzle 31 and its rod 32 into the steel water collection box 21. The tube 34 is configured to be connectable. Moreover, the 1st communicating hole 24 and the 2nd communicating hole 25 are made into the cylindrical shape of the joint pipe | tube aspect which protruded upwards from the upper surface 21a of the steel water collection box 21 so that the water flow pipe 33 and the guide pipe 34 can each be connected easily. Is formed. Furthermore, when the 1st communicating hole 24 and the 2nd communicating hole 25 are formed in the steel water collection box 21 like this embodiment, it is from the high pressure jet nozzle 31 inserted using the 2nd communicating hole 25. Two protective members 26 made of steel pipe material are provided between the screen tube 23 and the position where the high-pressure jet nozzle 31 is inserted so that the screen tube 23 is not damaged by jet injection. In addition, the horizontal width toward the underground structure 1 side of the steel water collecting box 21 when fixed to the retaining wall 13 is a width that does not hinder when the underground structure 1 is constructed, that is, the underground structure The width is set so as not to contact the object 1. Incidentally, the screen tube 23 uses a wound screen tube, and allows only the ground water to pass between the inside of the tube and the outside of the tube without passing the filter material 40 described later. A screen portion is formed by partitioning the inside of the steel water collection box 21 with respect to the opening 22 side using a mesh screen without using the screen tube 23, and the inside of the screen portion and the first communication hole 24 are communicated with each other. You may do it.

  Subsequently, as shown in FIG. 7, in step S <b> 2, the dredger pipe 33 a of the water pipe 33 is connected to the first communication hole 24 of the steel water collecting box 21, and the guide pipe 34 is connected to the second communication hole 25. The guide tube 34 is raised up to the vicinity of the ground. Up to the above steps is the explanation of the groundwater collection structure 10 in the present embodiment. In the groundwater catchment structure 10, the solidified material 14 at the position where the steel catchment box 21 of the catchment device 11 is attached and fixed is cut, and the underground water permeable layer 17 and the catchment device 11 communicate with each other (details will be described later). To have a water collecting function. In addition, although it is a principle to perform this step before the construction of the underground structure 1 is started, the construction of the structure may be started as long as it does not interfere with the installation of the groundwater collecting structure 10.

  Then, as shown in FIG. 8, in step S3, the frame construction of the underground structure 1 is started or continued. Each process described later can be performed in parallel with the frame construction.

  Subsequently, as shown in FIGS. 9 and 10, in step S <b> 4, the solidified material 14 of the retaining wall 13 is drilled from the ground to slightly below the depth of the underground permeable layer 17 to form a drilled hole (vertical hole-shaped cavity). ) 28 (clogging wall drilling step).

  The hole 28 is formed by drilling from the upper side to the lower side to a predetermined depth using a hole drilling rod of a hole drilling machine 29 installed on the ground. The hole 28 is formed at a position facing the steel water collection box 21 in plan view. In addition, if the drilling hole 28 has previously decided the formation position of the cutting hole 37 by the high pressure injection mentioned later, before hardening of the solidification material 14 at the time of construction of the earth retaining wall 13, it will be above this cutting hole 37 in this solidification material 14. It is also possible to preliminarily form the hole 28 by burying a box-shaped form with a circular pipe up to the position. In this way, the drilling process can be shortened. Furthermore, if the retaining wall 13 is constructed by forming a vertical hole in advance by installing a box forming mold with a circular pipe up to a cutting hole forming position to be described later, the drilling step can be omitted.

Subsequently, as shown in FIG. 11, in step S5, the drilling accuracy such as whether the drilling hole 28 is bent or not is confirmed during the retaining wall drilling step (drilling accuracy checking step). ).
Specifically, the drilling accuracy is confirmed by inserting an in-hole clinometer 35 into the drilling hole 28 and measuring the hole bending at an appropriate location. In addition, in the place where the vertical hole (cavity) was previously formed with the boxing mold by the circular pipe, this drilling accuracy confirmation step can be omitted.

  Subsequently, as shown in FIG. 12, in step S6, after forming the hole 28, the hole rod is pulled up to the ground. Thereafter, in order to protect the hole wall of the hole 28, the mouth tube is inserted about 1 m below the top end of the hole 28.

  Subsequently, as shown in FIGS. 13 and 14, in step S7, a known high-pressure jet injection device is used, and a rod 32 having a high-pressure jet nozzle 31 of the high-pressure injection device at its tip is inserted into the hole 28, and this High-pressure jet injection is performed from the borehole 28 toward the underground water-permeable layer 17 and from the borehole 28 toward the steel water collection box 21, and the underground water-permeable layer 17 located outside the retaining wall 13 and the water collection The solidified material 14 is cut so as to communicate with the apparatus 11 (steel water collecting box 21) to form a cutting hole 37 (inner wall inner cutting process). Note that the cutting to the underground water permeable layer 17 side is performed by bringing the tip of the rod 32 to the bottom of the hole 28 (below the steel water collection box 21), and then the high pressure jet nozzle. It is performed by pulling up the water jet from 31 to a predetermined position above (to be positioned above the steel water collection box 21) while being rotated and rotated by a predetermined range in plan view. Moreover, the cutting to the water collecting apparatus 11 side is performed by rotating the high-pressure jet nozzle 31 to the opposite side during the cutting to the underground water permeable layer 17 side. At this time, care must be taken so that the cutting range is within the opening 22 of the steel water collection box 21. By the way, if the communication between the underground water permeable layer 17 and the water collecting device 11 (steel water collecting box 21) only needs to be cut from the hole 28, the second communication hole 25 of the water collecting device 11 is used. May not be provided.

  In high-pressure jet injection, for example, an abrasive (silica sand) is mixed in water and injected (abrasive jet). Cutting force can be increased by mixing abrasives. In the case where it does not penetrate through only the jet injection from the drill hole 28 to the water collecting device 11 side, the guide pipe 34 connected to the second communication hole 25 is used, and the above-described high-pressure jet nozzle 31 is inserted into the guide pipe 34. Is inserted into the steel water collecting box 21 from the water collecting device 11 side toward the hole 28, and high pressure jet injection is performed from near the lower end of the opening 22 of the steel water collecting box 21 to the upper end thereof. Then, the solidified material 14 is cut so as to allow communication between the hole hole 28 and the water collecting device 11 to form the hole 37. On the other hand, when the retaining wall 13 is thin, the drilling hole 28 is not formed in the retaining wall 13, and the solidifying material 14 only from the side of the water collecting device 11 using the second communication hole 25 and the guide tube 34 is used. You may form the cutting hole 37 connected to the underground water permeable layer 17 by cutting.

  Subsequently, as shown in FIGS. 15 and 16, in step S <b> 8, the inside of the cutting hole 37 formed in the above-described retaining wall internal cutting process is flushed (cleaned) through the cutting hole 28 and the guide tube 34. Specifically, the inside of the cutting hole 37 is flushed by injecting air from the high pressure jet nozzle 31 using the rod 32 on which the high pressure jet nozzle 31 used in the previous step is formed. When cutting only from the water collecting device 11 side, flushing is performed via the guide tube 34.

Then, as shown in FIG. 17, in step S9, the cutting state of the cutting hole 37 formed in the solidified material 14 of the retaining wall 13 is measured after the retaining wall internal cutting step (cutting state measuring step). .
Specifically, an ultrasonic measuring instrument 38 is used, and a measuring unit 39 of the ultrasonic measuring instrument 38 is inserted into the cutting hole 37 using the drilling hole 28 or the guide tube 34. Measure cutting condition. Alternatively, it may be visually observed after inserting a camera.

Subsequently, as shown in FIGS. 18 and 19, in step S <b> 10, a filter material such as sand whose particle size is adjusted so that the earth and sand of the underground water permeable layer 17 does not flow into the screen tube 23 within the formation range of the cutting hole 37. 40 is input (filter material input step).
Prior to the introduction of the filter material 40, a screen tube (screen portion) 41 is inserted into the hole 28. The installation range in the vertical direction of the screen tube 41 is a range in which the cutting hole 37 is formed on the underground water permeable layer 17 side, and is arranged up to a position slightly above the formation range. The filter material 40 is inserted through the hole 28 and filled in the steel water collection box 21 (the filter material 40 is not filled in the screen tube 23), but the guide connected to the steel water collection box 21 is used. If the pipe 34 is also used, the filter material 40 can be more reliably filled into the cutting hole 37 and the steel water collection box 21. In the case of cutting only from the water collecting apparatus 11 side, the filter material 40 is supplied only from the guide tube 34. By the way, the screen tube 41 in the hole 28 is for flushing when the filter material 40 in the hole 37 is clogged and the water flow function is reduced, so the inside of the screen tube 41 is kept hollow. There is a need. The screen tube 41 uses a winding screen tube, and allows only water to pass between the inside of the tube and the outside of the tube without passing the filter material 40.

  A pair of groundwater permeable structures 100, 100 can be constructed by performing the same steps on the upstream side and the downstream side of the above-described steps S1 to S10.

  Subsequently, as shown in FIG. 20, in step S <b> 11, the gap between the water pipe 33 (soot pipe 33 a) of the upstream water collecting apparatus 11 and the water pipe (soot pipe 33 a) of the downstream water collecting apparatus 11. Are connected by a water pipe 33 (horizontal pipe 33b) by a siphon method (water pipe installation step) to complete the groundwater water flow facility 200.

  At this time, the soot pipe 33a extends above the connecting portion between the soot pipe 33a and the horizontal pipe 33b, and the valve 42 is provided there. The valve 42 is provided on both the upstream side and the downstream side, and the upstream valve is 42a and the downstream valve 42b. And in order to let water flow through the water flow pipe 33, the water flow auxiliary pipe 43 is connected to the upstream side pipe 33a, and the valves 42a and 42b are both opened. Water is poured from the auxiliary water flow pipe 43, and the water overflows from the downstream valve 42b, so that the water supply pipe 33 (horizontal pipe 33b) is completely filled with water. In this state, the valves 42a and 42b are closed. To. With this configuration, the water continuously flows through the water conduit 33 due to the siphon effect thereafter. In addition, when water is poured from the downstream side, it is assumed that water is filled when water overflows from the upstream valve 42a. Further, water may be injected using the guide pipe 34 or the hole 28 on the upstream side or the downstream side. FIG. 20 is a front view of the water collecting device 11 shown on both sides from the excavation side, and the underground structure 1 shown between the water collecting devices 11 and 11 is a water pipe 33 (horizontal pipe 33b). Sectional drawing of the position which passes is illustrated.

  According to the present embodiment, the earth retaining wall 13 is being constructed during the building of the underground structure 1 (if it is the initial stage of building construction, the water collecting device 11 can be attached in some cases) or before construction. By providing the water collecting device 11 on the wall surface 13a, the subsequent construction of the groundwater flow structure 100 and the construction of the underground structure 1 can be performed in parallel. Therefore, it is difficult to affect the frame construction of the underground structure 1, and the construction period can be shortened. Moreover, since the water collecting apparatus 11 is attached to the wall surface 13a of the earth retaining wall 13 before the building construction, it is possible to work safely. Further, since the earth retaining wall 13 can be cut after the underground water collecting structure 10 is installed and during or after the construction of the underground structure 1, the construction period can be shortened. . Furthermore, when cutting the retaining wall 13 during or after the construction of the underground structure 1, the water collecting device 11 is already provided even if a large amount of groundwater is discharged, so the risk of water discharge is reduced. Can do. And since it is only necessary to weld and fix the steel water collecting box 21 to the steel core material 15 of the retaining wall 13, the construction cost can be reduced with a simple configuration.

  Moreover, since the 2nd communicating hole 25 which can insert the high pressure jet nozzle 31 used in order to cut the solidification material 14 of the retaining wall 13 was formed in the upper surface 21a of the steel water collection box 21, the solidification material of the retaining wall 13 When cutting 14, the high pressure jet nozzle 31 can be inserted from the steel water collecting box 21 side. Therefore, the solidified material 14 can be easily cut with a simple configuration in which the second communication hole 25 is formed in the steel water collection box 21.

  Further, by providing a drilling accuracy confirmation step for confirming the drilling accuracy during the formation of the drilling hole 28, the drilling hole 28 with a desired accuracy can be formed, and the desired groundwater water flow structure 100 is constructed. be able to.

  Further, by providing a cutting state measuring step of measuring the cutting state of the cutting hole 37 after forming the cutting hole 37, the cutting hole 37 with high accuracy can be formed inside the retaining wall 13, and a desired state can be formed. The groundwater flow structure 100 can be constructed.

  The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and configuration described in the embodiment are merely examples, and can be changed as appropriate.

  For example, in this embodiment, although the case where the horizontal pipe 33b of the water flow pipe 33 passes above the underground structure 1 was demonstrated, the underground structure 1 like the groundwater water flow installation 200 shown in FIG. You may comprise so that it may pass below. At this time, the first communication hole 24 may be formed on the lower surface of the steel water collection box 21. When comprised in this way, the process of falling down the dredging pipe 33a of the water flow pipe 33 from the steel water collecting box 21 of the water collecting device 11 is carried out along with excavation, and when the flooring is reached, the upstream side in the vicinity of the flooring surface A step of connecting the water pipe 33 and the downstream side with the horizontal pipe 33b of the water pipe 33 is performed in advance. Since the other steps can be performed in parallel with the underground construction of the underground structure as described above, the construction period is not delayed even if configured in this way. Moreover, by comprising in this way, groundwater is filled in the downstream water collecting apparatus 11 naturally through the water flow pipe 33 from the upstream water collecting apparatus 11. At this time, the guide tube 34 is vented. Thereafter, when the construction of the downstream water collecting device 11 is completed, the water flow can be made naturally. In addition, although the 1st communicating hole 24 was formed in the lower surface of the steel water collection box 21 in this embodiment, the upper surface of the steel water collection box 21 may be sufficient. When the first communication hole 24 is formed on the upper surface, a 180-degree bent pipe may be used as a part of the water culvert pipe to guide it downward.

  Moreover, the construction method of the groundwater water flow structure 100 of the said embodiment can be applied to the earth retaining wall comprised with a mortar pile column wall, the earth retaining wall comprised with a soil cement continuous wall, etc. For example, even in the case of an underground continuous wall in which a steel bar as a steel core material is disposed in a concrete wall, the steel water collecting box 21 is fixed to the reinforcing bar of the underground continuous wall on the excavation side, and the steel water collecting box 21 If the predetermined range of the earth retaining wall on the excavation side is covered with the iron plate 12 around the entire circumference, the present invention can be applied.

  DESCRIPTION OF SYMBOLS 1 ... Underground structure (structure) 10 ... Groundwater catchment structure 11 ... Water collecting device 13 ... Earth retaining wall 13a ... Wall surface (of earth retaining wall) 14 ... Solidification material 15 ... Steel core material 17 ... Underground water permeability Layer 21 ... Steel water collection box 21a ... Upper surface (of steel water collection box) 22 ... Opening 23 ... Screen tube (screen part) 24 ... First communication hole 25 ... Second communication hole 28 ... Drilling hole (cavity) 31 ... High pressure jet nozzle 32 ... Rod (rod member) 33 ... Water pipe 33a ... Saddle pipe 33b ... Horizontal pipe 37 ... Cutting hole 40 ... Filter material 100 ... Ground water water flow structure 200 ... Ground water water flow equipment

Claims (4)

A retaining wall composed of a solidified material and a steel core material disposed in the solidified material at a predetermined interval is constructed by dividing the underground water permeable layer,
A groundwater collecting structure for collecting groundwater between the excavation side inside the earth retaining wall and the underground permeable layer,
A steel water collection box with an opening formed on one side;
A screen portion disposed inside the steel water collecting box;
Using a water collecting device comprising a first communication hole formed in the steel water collecting box so as to communicate with the screen portion,
The steel water collecting box is fixed to the retaining wall at the peripheral edge of the opening while the opening is at the depth of the underground water permeable layer and is opposed to the inside of the retaining wall,
A groundwater water collecting structure, wherein a water pipe is connectable to the first communication hole of the steel water collecting box.   The 2nd communicating hole which can insert the high-pressure injection device used in order to cut the solidification material of the earth retaining wall is formed in the upper surface of the steel water collecting box. Groundwater collection structure. A groundwater flow structure using the groundwater catchment structure according to claim 1,
At least by the high-pressure injection from the cavity formed in the earth retaining wall, the solidified material portion of the earth retaining wall is cut to form a cutting hole in which the water collecting device and the underground water permeable layer communicate with each other.
A groundwater water-flowing structure, wherein the cutting hole and the steel water collecting box are filled with a filter material, and water can be passed between the underground water permeable layer and the water collecting device. A groundwater flow structure using the groundwater catchment structure according to claim 2,
The solidified material portion of the retaining wall is cut by high pressure injection by the high pressure injection device inserted into the steel water collection box from at least the second communication hole, and the water collection device and the underground water permeable layer are separated. A cutting hole that communicates is formed,
A groundwater water-flowing structure, wherein the cutting hole and the steel water collecting box are filled with a filter material, and water can be passed between the underground water permeable layer and the water collecting device.

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