JP2017115329A - Water supply facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply facility capable of water supply or pumping with a high degree of freedom without depending on the length of a water pipe.SOLUTION: A water supply facility 1 includes: a square water conduit 21 allowing water to flow through an internal region thereof; a protruding pipe 22 which is disposed protruding from the internal region of the square water conduit 21 to an external region of the square water conduit 21, which connects the internal region of the square water conduit 21 and the external region of the square water conduit 21 to allow water to flow therethrough; and an H-shaped steel 11 inserted into a pile hole 13 in the ground. The square water conduit 21 is disposed around the H-shaped steel 11 in the pile hole 13.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a water flow facility.

  Conventionally, in a construction site of an underground structure or the like, a well pipe for injecting or pumping groundwater has been buried for the purpose of adjusting the level of the groundwater. For example, Patent Document 1 shows an example of a well pipe. When forming a well pipe in this way, usually, a large well pipe is installed around or inside an excavation area where an underground structure is to be constructed, and water injection or pumping is performed by connecting the well pipe to a pump. It was.

JP 2008-274578 A

Here, in the conventional well pipe as described above, the water injection position and the pumping position are determined depending on the length of the well pipe installed in the ground, so the position is further lower than the tip of the well pipe. Water injection and pumping were not possible, and there were the following problems.
First, the length of the well pipe is designed and installed based on the groundwater level predicted by the preliminary survey, but the actual groundwater level may be higher or lower than predicted due to seasonal changes. . Therefore, for example, when the actual groundwater level is higher than expected, the length of the installed well pipe does not satisfy a sufficient length, and there is a possibility that suitable pumping cannot be performed.
In addition, there are cases in which existing wells (that is, wells whose lengths have been determined in advance) provided in advance at the construction site are reused for water injection and pumping. The groundwater level may have changed compared to the time when the existing well was formed due to the passage of time, etc. In this case, the length of the existing well may not be sufficient.
In view of the above points, even when the length of a well pipe is designed based on a preliminary survey, or when the length of a well pipe is fixed, such as when an existing well is reused Therefore, there has been a demand for a water flow facility that can perform water injection or pumping with a high degree of freedom without depending on the length of the well pipe.

  The present invention has been made in view of the above, and even if the length of the water pipe such as the well pipe is determined, the water injection position and the pumping position depend on the length of the water pipe. The purpose is to provide a water flow facility that can perform water injection or pumping with a high degree of freedom.

  In order to solve the above-described problems and achieve the object, the water flow facility according to claim 1 includes a water pipe that allows water to pass through an inner region, and an inner region of the water pipe. A projecting portion disposed so as to reach an outer region of the water pipe, wherein the projecting portion connects the inner region of the water pipe and the outer region of the water pipe so that water can pass therethrough. .

  The water flow facility according to claim 2 is the water flow facility according to claim 1, further comprising an insertion member inserted into a hole in the ground, and the water conduit is provided around the insertion member in the hole. Is arranged.

  The water flow facility according to claim 3 is a water flow facility according to claim 1 or 2, wherein at least one of a liquid or a gas is ejected to the projecting portion to wash the projecting portion. Means.

  According to the water flow facility according to claim 1, the projecting portion is disposed so as to reach from the inner region of the water pipe to the outer region of the water pipe, the inner region of the water pipe, and the outside of the water pipe. Since it is provided with a projecting part that connects the area so that water can be passed, the length of the water pipe is fixed by allowing water to be injected or pumped from the outside area of the water pipe through the projecting part. Even if it is a case, water injection position or pumping position is not dependent on the length of a water flow pipe, and water injection or pumping with a high degree of freedom can be performed.

  According to the water flow facility of claim 2, water can flow through the water pipe arranged around the insertion member in the hole in the ground, the inner area of the water pipe, and the outer area of the water pipe. With a projecting portion that connects to the hole, so that the water pipe can be placed in the hole for the insertion material, and it is not necessary to form a hole for the water pipe using a dedicated excavating machine. In addition to being able to reduce, since the water pipe is accommodated inside the hole portion, the water pipe is not located around or inside the excavation region, and it is possible to prevent the water pipe from restricting the excavation work and the underground frame work.

  According to the water flow facility according to claim 3, since the cleaning means for ejecting at least one of liquid or gas to the projecting portion is provided, the soil around the projecting portion and the projecting portion is clogged and water is poured. When the efficiency decreases, the clogging can be eliminated by washing, and the efficiency of water injection can be restored.

It is a top view which shows roughly the water flow installation which concerns on embodiment of this invention. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 2. It is CC sectional view taken on the line of FIG. It is a figure which shows the procedure 1 of a construction method, Comprising: Fig.5 (a) is an expanded sectional view corresponding to the AA arrow cross section of FIG. 1, FIG.5 (b) is the EE arrow of Fig.5 (a). FIG. FIG. 6A is a front view and FIG. 6B is a DD arrow in FIG. 6A, showing a water-conducting square tube inserted into a pile hole and the periphery of the lower end of the H-shaped steel. FIG. It is a figure which shows the procedure 2 of a construction method, Comprising: Fig.7 (a) is an expanded sectional view corresponding to the AA arrow cross section of FIG. 1, FIG.7 (b) is FF arrow of Fig.7 (a). FIG. It is a figure which shows the procedure 3 of a construction method, Comprising: Fig.8 (a) is an expanded sectional view corresponding to the AA arrow cross section of FIG. 1, FIG.8 (b) is GG arrow of FIG.8 (a). FIG. It is a figure which shows the procedure 4 of a construction method, Comprising: Fig.9 (a) is an expanded sectional view corresponding to the AA arrow cross section of FIG. 1, FIG.9 (b) is HH arrow of FIG.9 (a). FIG. It is sectional drawing corresponding to the AA arrow cross section of FIG. 1 which shows the water flow installation which concerns on the modification 1 roughly. It is a top view which shows roughly the water flow installation which concerns on the modification 2. FIG. It is II sectional view taken on the line of FIG. It is an enlarged view of the front-end | tip of the washing pipe | tube in the water flow installation which concerns on the modification 3. It is sectional drawing corresponding to the AA arrow cross section of FIG. 1 which shows the water flow installation which concerns on the modification 4 roughly.

  Embodiments of a water flow facility according to the present invention will be described below in detail with reference to the accompanying drawings. First, [I] the basic concept of the embodiment will be described, then [II] the specific content of the embodiment will be described, and finally, [III] a modification to the embodiment will be described. However, the present invention is not limited to the embodiments.

[I] Basic Concept of Embodiment First, the basic concept of the embodiment will be described. Embodiments relate to water flow equipment for performing water injection, water pumping, or both water pouring and water pumping. However, unless otherwise specified, the water flow facility will be described as “water injection”, and the case where the water flow facility performs “pumping” will be described as appropriate.

[II] Specific Contents of Embodiment Next, specific contents of the present embodiment will be described.

(Constitution)
FIG. 1 is a plan view schematically showing a water flow facility 1 according to the present embodiment, and FIG. 2 is a cross-sectional view taken along line AA in FIG. In the following, the XX ′ direction in each drawing is referred to as “width direction”, particularly the X direction is referred to as “right direction”, and the X ′ direction is referred to as “left direction” as necessary. Further, the YY ′ direction is referred to as “depth direction”, in particular, the Y direction is referred to as “front direction”, and the Y ′ direction is referred to as “rear direction”. Further, the ZZ ′ direction is referred to as “height direction” or “depth direction”, in particular, the Z direction is referred to as “upward direction”, and the Z ′ direction is referred to as “downward direction”. Further, the portion above the ground surface is referred to as “ground”, and the portion below the ground surface is referred to as “underground”. In addition, in FIG. 1, illustration of soil is abbreviate | omitted for convenience of illustration.

  Here, although the water flow facility 1 can be installed at an arbitrary place, in the present embodiment, as shown in FIGS. 1 and 2, soil composed of buried soil, sand layer a, clay layer, and sand layer b. It is assumed that it is installed in In addition, the soil of the center part of the water flow installation 1 has shown the state excavated by the well-known method to the predetermined depth (for example, several meters) for the purpose of construction of an underground building. Hereinafter, the excavated area is referred to as “excavated area”, and the ground surface of the excavated area is referred to as “flooring surface” 2 below. In this excavation area, a plurality (four in the present embodiment) of pots 3 for collecting drainage are provided. Moreover, in each figure, the groundwater level is illustrated by a one-dot chain line. For example, in FIG. 2, the groundwater level of the sand layer a and the groundwater level of the sand layer b are illustrated by a one-dot chain line.

  Here, the water flow facility 1 is generally configured to include a parent pile 10, a well 20, and a lateral sheet pile 30.

(Configuration-parent pile)
The parent pile 10 is an insertion material formed in the pile hole portion 13 in the ground, and is provided at a plurality of locations at regular intervals along the edge of the excavation region. The “pile hole” 13 is a cylindrical hole excavated along the height direction (Z-Z ′ direction) using a known excavating machine (such as an earth auger) at the place where the parent pile 10 is installed. Yes, the depth of the pile hole 13 is arbitrary, but in this embodiment, the depth reaches the clay layer. In addition, since any parent pile 10 can be configured in the same manner, only one parent pile 10 will be described below.

  3 is a cross-sectional view taken along the line B-B in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line C-C in FIG. 3. As shown in FIGS. 3 and 4, the parent pile 10 schematically includes an H-shaped steel 11 and a root hardening portion 12.

  Here, the H-shaped steel 11 is a known steel frame composed of a flange and a web, which is an insertion material that is inserted into the underground pile hole portion 13. The height of the H-shaped steel 11 corresponds to the depth of the pile hole portion 13, and the lower end portion of the H-shaped steel 11 is solidified by the root solidified portion 12.

  The root consolidation part 12 is a root consolidation means for solidifying the H-shaped steel 11 at the bottom of the pile hole 13 in the ground, and is formed, for example, by solidifying a known root consolidation liquid (for example, cement milk).

(Configuration-Well)
Returning to FIG. 1 and FIG. 2, the well 20 is a pumping means buried in the ground for pumping or pouring underground groundwater, and the underground hole 13 (specifically, H It is arranged on the side of the web of the mold steel 11. Here, the number of the wells 20 may be determined as appropriate according to the target pumping amount and water injection amount, but in the present embodiment, as shown in FIG. Here, as shown in FIGS. 3 and 4, the well 20 schematically includes a water passage tube 21, a protruding tube 22, and a cleaning tube 23.

  The water flow square tube 21 is a water flow means disposed around the H-shaped steel 11 in the pile hole portion 13, and is a water flow pipe through which water can pass through the inner region of the water flow square tube 21. . Here, “water can pass through the inner area of the water passage square tube 21” includes that water passes through the entire inner area of the water passage square pipe 21, but in the present embodiment, FIG. 3 and FIG. As shown in FIG. 4, a projecting pipe 22 is provided inside the water passage square tube 21, and at the time of water injection, water passes only inside the projecting pipe 22, and the inner peripheral surface of the water passage square pipe 21. Water does not pass through the space S between the projecting tube 22 and the outer peripheral surface of the cleaning tube 23. Note that the water and air after washing pass through the inside of the space S when washing with the washing tube 23 (described later). Moreover, this water flow square tube 21 can be arrange | positioned in arbitrary positions, as long as it is the inside of the pile hole part 13, for example, although it does not need to be connected with the H-shaped steel 11, in this Embodiment, the H-shaped steel 11 The web is connected by a known method (for example, welding or the like). In addition, the shape of this water flow square tube 21 is arbitrary as long as water can pass through it, and in the following, it is a square tube shape, but may be, for example, a circular tube shape or a polygonal tube shape.

  The projecting pipe 22 is a projecting portion arranged so as to extend from the inner region of the water flow angle tube 21 to the outer region of the water flow angle tube 21, and the inner region of the water flow angle tube 21 and the water flow It is a projecting portion that connects an external region of the square tube 21 so that water can pass through. Here, the “external region” is a region excluding the region where the pile hole portion 13 is provided in the ground, and may be any position around the pile hole portion 13. However, in the present embodiment, the region below the pile hole portion 13 will be described. This protruding pipe 22 can be arbitrarily arranged as long as it extends from the inner area of the water flow angle pipe 21 to the outer area of the pile hole portion 13 in the ground. However, in the present embodiment, the protruding tube 22 is disposed in the inner region of the water flow angle tube 21 along the height direction (Z-Z ′ direction), and the upper end of the protruding tube 22 is As shown in FIG. 2, it is located on the ground in the same manner as the water flow angle tube 21, and the lower end of the protruding tube 22 is positioned inside a protruding hole 24 (described later) as shown in FIG. The upper end of the protruding pipe 22 is connected to a pump or the like (not shown) so that water can be fed into the protruding pipe 22 or groundwater can be pumped up.

  The “protruding hole” 24 is a protruding part formed so as to reach the outer region of the pile hole 13 in the ground from the inner region of the water-conducting square tube 21. It is a hole that connects the inner region and the outer region of the pile hole portion 13 in the ground so that water can pass through, and is formed in the vicinity of the lower end portion of the pile hole portion 13. The depth of the projecting hole 24 is arbitrary, but in this embodiment, as shown in FIG. 4, the root is solidified from the bottom surface of the water flow angle tube 21 (the lid portion 21 a shown in FIG. 6 described later). It is excavated through the part 12 and the clay layer to reach the sand layer b. By providing the projecting hole portion 24 in this way, it is possible to inject groundwater from a location deeper than the lower end of the water flow angle tube 21. Therefore, even when the well 20 reaches only the clay layer, water can be poured into the sand layer b below the clay layer. Moreover, when pumping up, it can pump up from the deep position in the ground by providing the projecting hole 24, and can lower the groundwater level more than the case where the projecting hole 24 is not provided. it can.

  A plurality of screen opening holes 25 are formed on the outer peripheral surface of the lower end portion of the protruding tube 22. Here, the “screen opening hole” 25 is a hole for allowing water to pass between the underground and the inner region of the projecting pipe 22, and its shape as long as such water can be passed, Although the diameter, the number, and the like are arbitrary, in this embodiment, circular holes are formed at equal intervals along the height direction (Z-Z ′ direction). In addition, a filter material is installed in a space (a space around the protruding tube 22) in the inner region of the protruding hole portion 24 where the protruding tube 22 is not disposed to prevent clogging of the screen opening hole 25. It doesn't matter.

  The cleaning tube 23 is a cleaning unit that cleans the protruding tube 22 by ejecting at least one of a liquid or a gas to the protruding tube 22. The cleaning pipe 23 is disposed along the height direction (Z-Z ′ direction) at a position in front of the protruding pipe 22 (Y direction) in the inner region of the water flow angle pipe 21. As shown in FIG. 2, the upper end of the cleaning pipe 23 is located on the ground as in the case of the water-conducting square pipe 21 and is connected to a pump or the like (not shown). It is possible to send in gas. Any liquid or gas may be used as the liquid or gas, but those with little soil contamination are preferable. In this embodiment, water is sent as “liquid” and “air” is sent as “gas”. Further, the lower end of the cleaning pipe 23 is located inside the protruding hole 24 as shown in FIG. 4, and water and air fed from the upper end of the cleaning pipe 23 are ejected from the lower end, The installation tube 22 is washed. Here, “cleaning the protruding tube 22” means that water flows smoothly in the vicinity of the protruding tube 22 or the protruding tube 22, specifically, the screen opening of the protruding tube 22. It includes not only eliminating clogging of the holes 25 but also eliminating clogging of the soil (sand layer b) around the projecting pipe 22. Further, the position of the lower end of the cleaning tube 23 is arbitrary, but preferably a position above the lower end of the projecting tube 22 by a predetermined distance (for example, about 10 cm) (Z direction) as shown in FIG. Moreover, the direction of ejection is arbitrary, and it may be ejected toward the inner peripheral surface of the projecting hole 24 or the outer peripheral surface of the projecting tube 22, or may be directed in another direction.

(Configuration-horizontal sheet pile)
Returning to FIG. 1 and FIG. 2, the lateral sheet pile 30 is earth retaining means for preventing the collapse of the soil outside the excavation area. This horizontal sheet pile 30 is arrange | positioned in multiple places so that it may arrange in the up-down direction between the H-shaped steel 11 of each parent pile 10, and is arrange | positioned at the square ring surrounding the excavation area | region as a whole. The specific shape, material, and the like of the horizontal sheet pile 30 are arbitrary. For example, a wooden board or a steel sheet pile having a sufficient thickness necessary for retaining the earth may be used.

(Construction method)
Then, the construction method of the water flow installation 1 which concerns on this Embodiment is demonstrated.

  FIG. 5 is a diagram showing a procedure 1 of the construction method, in which FIG. 5A is an enlarged cross-sectional view corresponding to the cross-section taken along the line AA in FIG. 1, and FIG. It is EE arrow sectional drawing. In FIG. 5B, illustration of soil is omitted for convenience of illustration, and similarly, illustration of soil is also omitted in FIGS. 7B, 8B, and 9B described later. doing.

  As shown in FIG. 5, first, excavation of the pile hole portion 13, insertion of the parent pile 10 and the well 20 into the pile hole portion 13, and excavation of the excavation region are performed. Specifically, first, the pile hole 13 is excavated using a known excavating machine, and when a predetermined depth (for example, a depth reaching the clay layer) is reached, the bottom of the pile hole 13 is obtained. Pour root hardening liquid. Next, before the poured root hardening liquid is solidified, the H-shaped steel 11 and the water flow square tube 21 which are integrally welded in advance are suspended by a heavy machine or the like and dropped into the pile hole portion 13. And the lower end of the water flow angle tube 21 is arranged so as to reach the root-setting liquid.

  Here, FIG. 6 is an enlarged view showing the periphery of the lower end of the water flow square tube 21 and the H-shaped steel 11 inserted into the pile hole portion 13, FIG. 6A is a front view, and FIG. It is DD sectional view taken on the line of Fig.6 (a). As shown in FIG. 6, a lid portion 21 a is welded to the lower end of the water flow angle tube 21, and the root hardening liquid before the root consolidation portion 12 solidifies enters the water flow angle tube 21. This lid portion 21a can prevent this from happening. Here, the shape of the lid portion 21a is arbitrary, but it may be simply a flat plate shape. However, when the water flow angle tube 21 is installed by being pressed into the ground, the cross section taken along the arrow D-D as shown in FIG. It is preferable that the inverted triangular lid portion 21a is pointed downward when viewed. In addition, it fills in the position shallower than the root hardening part 12 in the pile hole part 13 by filling backfilling sand with water by a well-known method. Next, while excavating the excavation area, the lateral sheet piles 30 are appropriately arranged to form the earth retaining wall.

  7 is a diagram showing a procedure 2 of the construction method, in which FIG. 7A is an enlarged cross-sectional view corresponding to the cross section taken along the line AA of FIG. 1, and FIG. It is FF arrow sectional drawing of a). As shown in FIG. 7, after the root hardening liquid is solidified and the root hardening part 12 is formed, the projecting hole part 24 is formed. Specifically, a known small excavating machine (for example, core boring) is set at the upper end of the water flow angle tube 21, and the excavation part (for example, core bit) at the tip of the excavation machine is passed from the upper end of the water flow angle tube 21. Insertion is started, and excavation is started in a state where the excavation portion is in contact with the upper surface of the lid portion 21 a of the water flow angle tube 21. Here, as shown in FIG. 6, since the upper surface of the lid portion 21a is horizontal, the excavation part at the tip of the excavating machine can be stably arranged to start excavation. Although the depth of excavation at this time is arbitrary, in this embodiment, as shown in the drawing, the sand layer b is passed through the lid portion 21a, the root hardening portion 12, and the clay layer of the water flow angle tube 21. Drill until it reaches.

  As described above, in the present embodiment, a small excavating machine that passes through the inside of the water flow square tube 21 such as core boring may be used, and a dedicated large excavating machine that forms the well 20 as in the conventional case. Therefore, the labor and time required for excavation can be reduced and the work space can be reduced. In addition, when performing water injection or pumping, it is only necessary to provide a projecting hole below the pile hole part that has been formed in the past, rather than forming a single large well, Man-hours can be reduced.

  8 is a diagram showing the procedure 3 of the construction method, in which FIG. 8 (a) is an enlarged cross-sectional view corresponding to the cross section taken along the line AA of FIG. 1, and FIG. 8 (b) is FIG. It is GG arrow sectional drawing of a). As shown in FIG. 8, the protruding tube 22 and the cleaning tube 23 are inserted into the ground. Specifically, the protruding tube 22 and the cleaning tube 23 are inserted from the inside of the water flow angle tube 21 to the protruding hole 24, and the lower ends of the protruding tube 22 and the cleaning tube 23 are protruded. It abuts on the bottom of the hole 24. The protruding tube 22 and the cleaning tube 23 may be inserted separately or simultaneously. In the case of simultaneous insertion, the protruding tube 22 and the cleaning tube 23 are previously connected by a known method (for example, welding). Etc.).

  Finally, FIG. 9 is a diagram showing procedure 4 of the construction method, in which FIG. 9A is an enlarged cross-sectional view corresponding to the cross section taken along the line AA in FIG. 1, and FIG. It is HH arrow sectional drawing of a). As shown in FIG. 9, water is poured into the protruding pipe 22. The water poured in this way moves to the lower end of the projecting pipe 22 through the projecting pipe 22, passes through the screen opening hole 25 shown in FIG. sent to b.

  Here, when water is poured through the projecting pipe 22 for a long period of time, substances contained in the water are clogged in the screen opening hole 25, or the soil on the inner surface of the projecting hole 24 is clogged, Water injection efficiency may decrease. In such a case, the water injection efficiency can be recovered by feeding water and air into the cleaning tube 23 and ejecting the water and air from the lower end of the cleaning tube 23. Although the cleaning cycle is arbitrary, it may be executed periodically, for example, every predetermined period (for example, every 3 days).

  In this embodiment, cleaning is performed while water is being injected. However, the present invention is not limited to this, and cleaning may be performed in a state where water is stopped. For example, a known valve may be installed in the water passage tube 21, and water and air may be ejected from the cleaning tube 23 after stopping water injection by manually or automatically closing the valve.

(Effect of embodiment)
According to the water flow facility 1 according to the present embodiment as described above, the projecting pipe 22 is arranged so as to extend from the inner region of the water flow angle tube 21 to the outer region of the water flow angle tube 21, Since the projecting pipe 22 is provided to connect the inner region of the water flow angle tube 21 and the outer region of the water flow angle tube 21 so that water can flow, the water flow angle tube is provided via the projecting tube 22. Even if it is a case where the length of the water flow angle tube 21 is determined by being able to pour water or pump water from the outside area of 21, the water injection position and the water pumping position are not dependent on the length of the water flow angle tube 21, Water injection or pumping with a high degree of freedom can be performed. In addition, as described above, water injection or pumping can be performed in the external region located outside the pile hole portion 13, and the degree of freedom of the water injection position or pumping position can be improved. Even when 21 does not reach the lower layer of the clay layer, water can be injected or pumped in the lower layer of the clay layer by extending the projecting pipe 22 to the lower layer of the clay layer.

  Conventionally, large well steel pipes have been installed around and inside the excavation area where underground structures are to be constructed, and a dedicated excavation machine for forming large well steel pipes is required, so there is no flow of construction. There is a possibility that the number of man-hours related to construction will increase due to complications, etc., and because well steel pipes are located around and inside the excavation area (for example, material storage area and material processing area), excavation work and underground frame work May be restricted (for example, restrictions on the installation position and scale of the material storage area and the material processing area). However, according to the water flow facility 1 according to the present embodiment, the water flow angle tube 21 arranged around the H-shaped steel 11 in the underground pile hole portion 13, the internal region of the water flow angle tube 21, Since the projecting pipe 22 that connects the outer region of the water flow angle tube 21 so that water can flow is provided, the water flow angle tube 21 can be disposed in the pile hole portion 13 for the H-shaped steel 11 and is dedicated. It is not necessary to form a hole for the water-conducting square pipe 21 using the excavating machine, and the number of man-hours required for the construction can be reduced. It is possible to prevent the water passage angle tube 21 from being located inside and restricting the excavation work and the underground frame work by the water flow angle tube 21.

  In addition, since the cleaning pipe 23 that ejects at least one of liquid or gas to the protruding pipe 22 is provided, when the soil around the protruding pipe 22 or the protruding pipe 22 is clogged and the efficiency of water injection is reduced, Washing can eliminate clogging and restore water injection efficiency.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. For example, a temporary pile or a friction pile of a well-known structural column method can be suitably implemented. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above contents, and may vary depending on the implementation environment and details of the configuration of the invention. In some cases, only a part of the effects described above may be achieved.

(About dimensions and materials)
The dimensions, shapes, materials, ratios, and the like of each part of the water flow facility 1 described in the detailed description of the invention and the drawings are merely examples, and may be any other dimensions, shapes, materials, ratios, and the like.

(About water pipes)
In the present embodiment, the “water pipe” is the “water square pipe” 21 disposed inside the pile hole portion 13, but is not limited thereto, and the region other than the pile hole portion 13 ( For example, it may be a well-known “well steel pipe” (for example, a diameter of 500 mm) arranged in the excavation area or in a material storage place or a material processing place provided around the excavation area.
Here, as described above, the length of the well steel pipe is determined based on the groundwater level predicted by the preliminary survey, but the actual groundwater level can be higher or lower than predicted due to seasonal changes, etc. There is sex. For example, when the actual groundwater level is higher than predicted, the length of the well steel pipe does not satisfy a sufficient length, and there is a possibility that suitable pumping cannot be performed. However, even in this case, by excavating the projecting hole 24 at the bottom of the well steel pipe to compensate for the shortage, water can be pumped or injected from the projecting hole 24, and the lack of the length of the well steel pipe can be eliminated. .
In addition, when rebuilding work, etc., it is possible to reuse the existing well steel pipe buried in the soil. In this case, even if the existing well steel pipe is clogged, the well steel pipe The water can be poured or pumped suitably from the excavation area by excavating the lower part of the area.

(About projecting pipe)
In the present embodiment, the entire projecting pipe 22 is described as being left in the ground, but a part of the lower end of the projecting pipe 22 (for example, a portion corresponding to a clay layer and a sand layer b. The lower part of the installed pipe ”) and the upper most part (for example, the part corresponding to the buried soil and the sand layer a; hereinafter referred to as the“ upper part of the installed pipe ”) can be separated from each other. It may be left inside and the upper part of the projecting pipe may be pulled out from the ground. Although the specific content of such a separation structure is arbitrary, for example, a threaded joint may be provided at the connecting portion between the protruding tube upper portion and the protruding tube lower portion. Then, in the state where the protruding tube 22 is inserted into the well 20 and the lower end of the lower portion of the protruding tube is pressed against the bottom of the protruding hole 24 and fixed, the upper portion of the protruding tube is rotated about the axis. As a result, the coupling of the threaded joint is released, and only the lower part of the projecting pipe is dropped, and the upper part of the projecting pipe may be pulled out from the ground and separated. Thereby, since the water flow angle tube 21 can serve as the upper part of the protruding tube, water can be poured from the upper portion of the water flow angle tube 21. Further, the separated projecting pipe upper part can be reused as the projecting pipe upper part in the other well 20 as well, and the number of members required for construction can be reduced.

(About cleaning)
The timing for executing the cleaning is arbitrary, and in the present embodiment, the protruding tube 22 is periodically cleaned every predetermined period. However, the present invention is not limited to this. For example, you may perform washing | cleaning, when detecting that the water injection efficiency fell. FIG. 10 is a cross-sectional view corresponding to the cross section taken along the line AA of FIG. 1 schematically illustrating the water flow facility 100 according to the first modification. However, unless otherwise specified, the description is omitted because it is the same as that of the embodiment, and the same components as those of the embodiment are denoted by the same reference numerals as those used in the embodiment if necessary. Attached. In the second and third modifications, which will be described later, the description will be omitted as appropriate, and the same reference numerals as those used in the embodiment will be given.

  Here, the water flow facility 100 according to the first modification generally includes a pump 40 that pumps water to the well 20 and a flow meter 50 that measures the amount of water to be injected. The branch pipe that branches to the side is provided with a regulating valve 60 that adjusts the amount of water poured into each well 20. The adjustment valve 60 is open when the internal pressure of the projecting pipe 22 is lower than the reference value (for example, when the projecting hole portion 24 is not clogged), but the internal pressure is higher than the reference value. In such a case (for example, when the projecting hole 24 is clogged), it automatically closes and water injection to the projecting pipe 22 is stopped. When it is detected by a known means that the regulating valve 60 is in a closed state, water and air are ejected from the cleaning pipe 23 to the projecting pipe 22 where the regulating valve 60 is installed. good. With such a configuration, it is possible to automatically clean only the wells 20 that need cleaning, among the plurality of wells 20. The opening degree of the regulating valve 60 may be adjusted according to the height of the internal pressure. Further, by providing the common pump 40 for all the wells 20 as in the first modification, the water injection efficiency can be improved as compared with the case where the pump 40 is provided for each well 20. For example, even when one well 20 is clogged, by closing the regulating valve 60 of the well 20 and leaving the other regulating valve 60 open, the other well 20 is clogged while pouring water. The well 20 can be individually handled easily.

(About pumping)
In this Embodiment, although demonstrated as what injects water with the water flow installation 1, you may perform pumping as mentioned above, and in some wells 20 among several wells 20, pumping water, others The well 20 may be filled with water. FIG. 11 is a plan view schematically showing a water flow facility 200 according to Modification 2, and FIG. 12 is a cross-sectional view taken along the line II in FIG. The water supply facility 200 is provided with a well 70 for pumping water. When pumping water, the well 70 does not need to reach the lower sand layer b of the clay layer, so that the projecting pipe 22 stops at the upper sand layer a of the clay layer as shown. In addition, since the dry work of the flooring surface 2 of an excavation area | region can be ensured by lowering the water level of the sand layer a by pumping, it is not necessary to provide the pot place 3 as shown in embodiment like illustration.

(About the water flow angle tube)
In this Embodiment, after excavating the pile hole part 13 in the ground, the water flow angle tube 21 was inserted in the said pile hole part 13, but not only this but the water flow angle pipe 21 is known by the well-known press-fitting method. You may install it in the ground. In particular, the water flow angle tube 21 of the present embodiment has a strength suitable for the press-fitting method as compared with the water flow tube according to the prior art. That is, since the tip perforated steel pipe like the water pipe in Patent Document 1 of the prior art has a screen opening hole (slit) in the tip perforated steel pipe itself, the strength of the tip perforated steel pipe itself is reduced by the slit. Therefore, it has been difficult to ensure sufficient strength of the forged steel pipe at the tip (sufficient strength to withstand the press-fitting method). However, in the water flow angle tube 21 such as the water flow tube in the present embodiment, the screen opening hole 25 is provided in the protruding tube 22, so that it is not necessary to provide the screen opening hole 25 in the water angle tube 21 itself. Sufficient strength of the water angle tube 21 can be easily secured. Therefore, it can endure when the H-shaped steel 11 and the water flow square tube 21 are press-fitted together. Furthermore, in Patent Document 1, it is necessary to take measures against clogging (cloth filter or the like) in the slit in order to prevent soil from entering the slit from the slit of the perforated steel pipe at the time of press fitting. Then, since the hole like a slit is not provided in the water flow square tube 21 used as the object of press injection, the countermeasure against clogging is unnecessary and workability can be improved. When applying the press-fitting method as described above, as shown in FIG. 6, it is preferable to provide a taper at the lower end of the lid 21a. However, when the press-fitting method is not applied, it is simply a flat lid 21a. May be provided.

(About washing tube)
FIG. 13 is an enlarged view of the tip of the cleaning pipe 23 in the water flow facility 300 according to the third modification. In FIG. 13, the flow paths of water and air ejected from the cleaning pipe 23 are indicated by arrows. As shown in FIG. 13, a dish-like return portion 80 that is folded upward (Z direction) may be provided at a position below the outlet of the cleaning tube 23. By this return portion 80, water and air ejected downward from the cleaning pipe 23 are redirected upward by the return portion 80 and reach the entire projecting hole 24, so that more effective cleaning is possible. It becomes.

(About protruding holes)
In this embodiment, the protruding tube 22 is inserted into the protruding hole 24. However, the protruding tube 22 may not be inserted into the protruding hole 24. For example, the protruding tube 22 itself may be omitted, and water may flow directly to the inner region of the water flow angle tube 21 or the protruding hole portion 24. FIG. 14 is a cross-sectional view corresponding to the cross section taken along the line AA of FIG. As shown in FIG. 14, first, a projecting hole 24 is excavated and formed at the bottom of the well 20 in the same manner as in the embodiment, and then the projecting hole 24 is filled with a filter material 26. Prevents the soil surrounding the projecting hole 24 from collapsing. Although this filter material 26 can use crushed stone, for example, it is not restricted to this. Then, by operating a pump for pumping or pouring water (not shown), water can be passed between the well 20 and the ground (sand layer b) through the filter material 26 (projecting hole 24). . In addition, as shown in the drawing, the filter material 26 may be cleaned by filling the inside of the projecting hole 24 with a cleaning tube 23 in addition to the filter material 26 (particularly it is preferable to provide it when water is poured). The cleaning tube 23 may not be provided. Further, after the protruding tube 22 is inserted into the protruding hole 24, the filter material 26 may be filled around the protruding tube 22 of the protruding hole 24. In addition, the structure using such a filter material 26 is employable similarly also when using a well steel pipe as mentioned above.

(Appendix)
The water flow facility according to appendix 1 includes a water pipe that allows water to pass through the inner region, and a projecting portion that is arranged to extend from the inner region of the water pipe to the outer region of the water pipe. And a projecting portion that connects the inner region of the water conduit and the outer region of the water conduit so that water can pass therethrough.

  The water flow facility according to attachment 2 is provided with an insertion material inserted into a hole in the ground in the water flow facility according to attachment 1, and the water flow pipe is disposed around the insertion material in the hole. Has been.

  The water flow facility according to appendix 3 is provided with cleaning means for cleaning the projecting portion by jetting at least one of a liquid or a gas to the projecting portion in the water flow facility according to appendix 1 or 2.

(Additional effects)
According to the water flow facility described in appendix 1, the projecting portion is arranged to extend from the inner region of the water pipe to the outer region of the water pipe, the inner region of the water pipe, and the outer region of the water pipe If the length of the water pipe is fixed, water can be injected or pumped from the outside area of the water pipe via the protrusion. Even so, the water injection position and the pumping position are not dependent on the length of the water pipe, and water injection or pumping with a high degree of freedom can be performed.

  According to the water flow facility described in appendix 2, water can pass through the water pipe arranged around the insertion member in the hole in the ground, the inner area of the water pipe, and the outer area of the water pipe. Since it has a projecting part to be connected, it is possible to place a water pipe in the hole for the insertion material, making it unnecessary to form a hole for the water pipe using a dedicated excavating machine, reducing the man-hours related to construction In addition, since the water pipe is accommodated inside the hole portion, the water pipe is not located around or inside the excavation area, and it is possible to prevent the water pipe from restricting excavation work and underground frame construction.

  According to the water flow facility described in the supplementary note 3, since the cleaning unit that ejects at least one of liquid or gas to the projecting portion is provided, the soil around the projecting portion and the projecting portion is clogged and water injection efficiency is increased. When water drops, clogging can be eliminated by washing, and the efficiency of water injection can be restored.

DESCRIPTION OF SYMBOLS 1 Water flow equipment 2 Flooring surface 3 Kamba 10 Parent pile 11 H-shape steel (insertion material)
12 Root consolidation part 13 Pile hole (hole)
20 Well 21 Water-conducting square tube
21a Lid 22 Projection pipe (projection part)
23 Cleaning tube (cleaning means)
24 Projection hole (projection)
25 Screen opening hole 26 Filter material 30 Horizontal sheet pile 40 Pump 50 Flow meter 60 Control valve 70 Well 80 Return part 100, 200, 300, 400 Water flow equipment S Space

Claims (3)

A water pipe that allows water to pass through the internal area;
It is a projecting portion arranged so as to reach the outer region of the water pipe from the inner region of the water pipe, and water can pass through the inner region of the water pipe and the outer region of the water pipe. A projecting portion to be connected so as to be,
Water flow equipment. It has an insertion material inserted through the hole in the ground,
The water pipe is disposed around the insertion member in the hole,
The water flow facility according to claim 1. A cleaning means for cleaning the protruding portion by ejecting at least one of liquid or gas to the protruding portion;
The water flow facility according to claim 1 or 2.

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