JP2011021349A - Rainwater permeation pit excavator, construction method for laying rainwater permeation pipe, and rainwater permeation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rainwater permeation pit excavator capable of letting a rainwater permeation pipe reach the ground having permeability by small-scale construction work, to provide a construction method for laying the rainwater permeation pipe by use of the excavator, and to provide a rainwater permeation structure to be constructed by this method. <P>SOLUTION: This rainwater permeation pit excavator includes a base 1 having a through-hole 11 allowing a metallic pipe body SP to be inserted therethrough, a hydraulic jack 2 erected on the base, an elevatable slider 3 supported by the hydraulic jack, holding means 33, 34, 35 for holding the metallic pipe body while being supported by the slider, and a motor 4 supported on an upper part of the metallic pipe body to rotate an auger screw OS. In this construction method for laying the rainwater permeation pipe, the rainwater permeation pipe WP is inserted into the metallic pipe body after excavation and is packed with an inside filter IF and an outside filter OF on its inner side and outer side, respectively. The rainwater permeation structure is constituted by packing the whole inside of the rainwater permeation pipe passing through a bottom part of a street gutter basin LM and its outside with filters, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rainwater infiltration pit excavation apparatus for laying a rainwater infiltration pipe, a rainwater infiltration pipe laying method using the excavation apparatus, and a rainwater infiltration structure constructed by the rainwater infiltration pipe laying method. is there.

  A conventional rainwater infiltration structure is a structure in which a permeation pipe is buried directly under a hole penetrating the bottom of a street wall (collecting water), and this permeation pipe is filled with quarry (Patent Document 1). ). However, this type of technology is appropriate if the soil directly under the street (water collecting basin) is permeable, but if there is a distance to the permeable soil, rainwater is sufficient. It had the problem of not penetrating.

  In addition, the groundwater underground drainage structure in the ground where the aquifer, impervious layer, and non-aquifer are accumulated sequentially from the ground surface, the pre-boring method or Nakabori method is applied to the above three layers of ground. There was a mine that reached the aquifer, and there was one that constructed a drainage pipe with ordinary concrete (range of aquifer and impermeable layer) and porous concrete (position of non-aquifer) (patent) Reference 2). However, because this technology is a structure for draining surface water whose groundwater level has risen further due to rainwater, snowmelt water, etc., to ground subsurface aquifers, such as in coastal dunes, where the groundwater level is high, The construction itself was so large that it could not be implemented as a drainage structure in urban areas such as streets.

JP 2006-138197 A (page 8-9, FIGS. 1 and 5-12) JP 2001-329602 A (page 3, FIG. 1 and FIG. 2)

  By the way, in recent years, when there is rainfall that exceeds the capacity of the sewage pipe due to heavy rain called so-called guerrilla heavy rain, rainwater accumulates on the road surface, and when this flows into the river, it causes flooding of the river. When it flows into low-lying areas, it would cause damage such as flooding on the floor. Therefore, there is a need for a structure that can effectively infiltrate rainwater flowing into the streets into the ground. It was a difficult situation to install.

  The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide an infiltration mine excavator capable of allowing an infiltration pipe to reach a permeable ground by small-scale construction. Another object of the present invention is to provide a rainwater permeation pipe laying construction method using this and a rainwater permeation structure constructed by the construction method.

  In view of this, the present invention relating to the rainwater infiltration mine excavation apparatus simultaneously press-fits a metal pipe body having an inner diameter enough to allow the rainwater infiltration pipe to be laid therethrough and an auger screw rotatable inside the metal pipe body. An apparatus for providing a rainwater infiltration pit for laying the rainwater infiltration pipe, a base having a through-hole through which the metal pipe body can be inserted, a hydraulic jack erected on the base, A slider supported by the hydraulic jack and capable of moving up and down, holding means for holding the metal tube while being supported by the slider, and a motor for rotating the auger screw supported by the upper portion of the metal tube. It is characterized by having.

  According to the above configuration, the metal pipe body and the auger screw are simultaneously press-fitted into the ground by the lowering of the slider, and the earth and sand excavated by the auger screw is transported to the upper side of the metal pipe body and the pit is excavated downward in the ground. Will be able to. In addition, the auger screw is given a rotational driving force by a motor supported on the upper part of the metal tube, and the metal tube is held by the metal tube so that the metal tube is fixed. The auger screw is rotated based on the tube-making body. Furthermore, the auger screw is moved up and down integrally with the metal tube through a motor.

  In the above invention, the metal pipe body is a steel pipe formed by engraving a male screw on the outer surface near one end and a female screw on the inner surface near the other end, and the motor is screwed to the other end of the steel pipe. It can be set as the structure fixed to this steel pipe through the possible adapter.

  With such a configuration, the metal tube body can be connected by screwing, and the motor is fixed to the metal tube body by being supported by the adapter. That is, the adapter and the metal tube are fixed by screwing, and the adapter and the motor are connected. At this time, the adapter and the metal tube are screwed together by rotation in a direction different from the reaction force received by the rotation drive by the motor, that is, when the motor rotates to the right, the metal tube and the adapter Since the reaction force of the motor acts on the left rotation by screwing with the left screw, the adapter can be prevented from being loosened and detached due to the reaction force at the time of motor rotation.

  Moreover, the holding means in each of the above inventions can be a holding means constituted by a plurality of pressing bodies that can be pressed in the central direction from the periphery of the metal pipe body. With the above configuration, the plurality of pressing bodies supported by the slider press the metal tube disposed at the center of the slider, so that the pressing body can hold the metal tube as a whole. The plurality of pressing bodies may be installed on the same slider, and a through-hole through which the metal pipe body can be inserted may be provided at the center thereof, and the independent pressing bodies may be operated in synchronization with each other. . When providing an independent pressing body, it is preferable that each is supported by a plurality of sliders attached to individual hydraulic jacks, and the hydraulic jacks operate in synchronization.

  In each said invention, it is preferable that a base is a base which can mount | wear with the weight mounting tray which can mount a weight. In this case, when the metal tube and the auger screw are press-fitted, the reaction force received from the ground can be eliminated by the weight installed on the weight placing tray. This weight loading tray can be mounted at an appropriate location on the base, and the installation location can be changed according to the ground situation or the situation of the surrounding buildings.

  The base is a base configured in a quadrilateral plate shape, and the weight mounting tray can be mounted on any side of the quadrilateral of the base. In this case, basically, weights can be obtained while the balance of the base is favorably provided by mounting the weight placing trays at two symmetrical positions. In addition, if the weight loading tray cannot be installed at a symmetrical position due to the situation of the building around the street, the metal tube and orgas can also be installed by installing the weight loading tray at a position avoiding the building. It can counter the reaction force received by the press-fitting of the cru.

  Furthermore, the auger screw in each of the above inventions can be an auger screw having a drilling cutter at the tip. With such a configuration, when penetrating through the bottom of the street mast, a hole corresponding to the required area can be penetrated by the drilling cutter. In other words, since ordinary street lamps are made of concrete, it is difficult to make a through hole in the concrete only by rotating the auger screw. While providing a through-hole, the excavation of the ground is enabled, and further, the rock and the like existing in the ground can be crushed.

  The present invention relating to the rainwater infiltration pipe embedment method is a rainwater infiltration pipe laying method using the rainwater infiltration mine excavator, wherein the metal pipe and the auger screw are previously adjusted to a length corresponding to several strokes of the hydraulic jack. The base is installed around the upper opening of the street wall where the rainwater permeation pipe is to be embedded, the metal pipe is held by the holding means, and the auger screw is placed inside the metal pipe. The motor is installed at the upper end of the metal pipe body, the drive shaft of the motor is connected to the rotation shaft of the auger screw, and the slider is lowered while rotating the auger screw. Lower the metal pipe body and auger screw at the same time, penetrate the bottom of the street mast, press the metal pipe body and auger screw into the ground, and at the end of the predetermined descent Release the holding of the metal tube by the holding means and remove the motor from the auger screw, and then raise the slider, and the same kind of metal tube and auger screw are already pressed into After adding the metal tube and the auger screw, holding the metal tube by the holding means and installing the motor on the upper end of the metal tube and connecting it to the auger screw, the metal tube and the auger screw are again attached. Press in and repeat the above operation, press the metal tube and auger screw to the expected depth, then remove the auger screw and insert the rainwater infiltration tube inside the remaining metal tube. After filling the inside with a replaceable filter, the metal tube is removed.

  According to the above configuration, the metal pipe body and the auger screw can be lowered by raising and lowering the slider several times, and further, the permeability can be improved by adding the metal pipe body and the auger screw. It is possible to press-fit the metal pipe body until it reaches the soil region that it has. Thus, by fully press-fitting the metal tube body, in the state where the auger screw is removed, the inside of the metal tube body is in a hollow state, so if the rainwater permeation tube is inserted into this hollow portion, Rainwater infiltration pipes can be installed in the ground. Furthermore, when the permeable ground exists in a relatively shallow position, there is little addition of the metal pipe and auger screw, and when the permeable ground exists in a relatively deep position, the metal pipe And by adding a lot of auger screws, it is possible to cope with different soil conditions.

  In the said invention, after removing the said metal pipe body, it can be set as the structure filled with an external filter in the clearance gap produced by removal of this metal pipe body. In the case of such a construction method, the rainwater infiltration pipe is buried in the ground in a stable state, and when rainwater penetrates into the ground, it is filtered by both the inside and outside filters of the rainwater infiltration pipe. It becomes.

  In both the above-described inventions, the filter can be filled with a filter made of a material capable of adsorbing or capturing oil and metal components all over the rainwater permeation pipe. With such a configuration, it is possible to purify rainwater using the hollow interior of the rainwater permeation pipe, and it is possible to remove oil and metals that should not be drained into the ground.

  On the other hand, the present invention relating to a rainwater infiltration structure is a rainwater infiltration structure configured by the rainwater infiltration pipe laying method, and penetrates the bottom of a street wall while reaching the permeable ground. A pipe is laid and a filter is filled in almost the entire area of the rainwater permeation pipe.

  According to the above configuration, since the rainwater infiltration pipe can be arranged in the range from the bottom of the street mast to the permeable ground, a part of the rainwater that has flowed into the city mound can flow down to the rainwater infiltration pipe. It can be infiltrated into the ground in a water-permeable ground. As a result, the amount of rainwater flowing down the street can be reduced and the amount of inflow into the sewage pipe can also be reduced.

  In addition, the present invention relating to a rainwater infiltration structure is a rainwater infiltration structure configured by the rainwater infiltration pipe laying method, wherein the rainwater infiltration is within a range reaching the permeable ground while penetrating the bottom of the street. A pipe is laid, the rain filter is filled with an internal filter in the almost entire area inside the rainwater permeation pipe, and an external filter is filled outside.

  According to the above configuration, a part of rainwater flowing into the street can be permeated into the permeable ground from the rainwater permeation pipe, and the rainwater penetrating at that time is filtered, and the internal filter is replaced. Therefore, it can be used for a long period of time.

  The rainwater permeation pipe in the above invention can be a rainwater permeation pipe in which at least a portion installed on the permeable ground is constituted by a perforated pipe. In this case, it is possible to infiltrate rainwater not only from the lower end opening of the rainwater permeation pipe but also from the wall surface of the rainwater permeation pipe into the ground, thereby improving the permeation speed.

  According to the present invention concerning a rainwater infiltration mine excavation device, a rainwater infiltration mine can be excavated using a space of a base installed around a street wall where a rainwater infiltration pipe should be embedded. A sufficient depth of rainwater infiltration mine can be established by simple construction. In particular, the metal pipe body is press-fitted by lowering the slider with a hydraulic jack, so the driving force can be reduced by a small hydraulic generator, and the use space around the construction site should be small. Can do.

  In addition, according to the present invention concerning the rainwater infiltration pipe embedding method, it is possible to excavate the rainwater infiltration mine to the desired depth while adding the metal pipe body and auger screw having the same length as the stroke length of the hydraulic jack. The buried area of the rainwater permeation pipe is secured by the metal pipe body, which provides a small and simple construction method.

  Furthermore, since the present invention concerning the rainwater infiltration structure is constructed by the above construction method, it can be constructed on a small scale and easily, and an internal filter fills almost the entire area of the rainwater infiltration pipe. Therefore, the oil or metal that can be contained in the rainwater flowing from the roadway is adsorbed or captured by the filter, so that the oil and metal can be prevented from flowing into the underground. In addition, by filling a lump of the internal filter almost over the entire area of the rainwater permeation pipe, the filter can be easily removed and the filter can be easily replaced at an appropriate time. Furthermore, by providing an external filter, rainwater that has been further purified will penetrate into the ground.

It is explanatory drawing which shows embodiment of a rainwater penetration hole excavation apparatus. It is explanatory drawing which shows the relationship between a base, a hydraulic jack, and a slider. It is explanatory drawing which shows the relationship between a motor, a metal pipe body, and an auger screw. It is explanatory drawing which shows the usage condition of a rainwater penetration hole excavation apparatus. It is explanatory drawing which shows embodiment of a rainwater penetration pipe embedding construction method. It is explanatory drawing which shows embodiment of a rainwater penetration pipe embedding construction method. It is explanatory drawing which shows embodiment of a rainwater penetration pipe embedding construction method. It is explanatory drawing which shows embodiment of a rainwater penetration pipe embedding construction method. It is explanatory drawing which shows embodiment of a rainwater penetration pipe embedding construction method.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an embodiment of a rainwater penetration mine excavator will be described. In this embodiment, as shown in FIGS. 1 and 2, a base 1, a hydraulic jack 2 standing on the base 1, a slider 3 supported by the hydraulic jack 2, and a metal such as a steel pipe It is comprised by the motor 4 supported by the upper end of the pipe making body (it abbreviates as steel pipe hereafter) SP.

  The base 1 is a plate-like metal member having a through hole 11 at the center of which at least the steel pipe SP can be inserted, and is formed into a quadrilateral shape in plan view. Further, a flat portion is provided around the through hole 11, and the hydraulic jack 2 is installed on the flat portion.

  The hydraulic jack 2 is provided at two symmetrical positions with the through hole 11 as the center, and oil is supplied from a hydraulic device (not shown). The hydraulic jack 2 is configured such that the base end of the cylinder portion 21 is connected to the base 1 and the tip end of the piston portion 22 is connected to the slider 3. The slider 3 is configured to be movable up and down by oil entering and exiting.

  The slider 3 is provided with a through hole 31 at the center so that the steel pipe SP can be inserted, and a flat portion 32 is provided around the through hole 31. The planar portion 32 is provided with three pressing bodies 33, 34, and 35 that can advance and retreat toward the center of the through hole 31 (center line of the steel pipe SP inserted through the through hole 31) in plan view. The advance and retreat of the pressing bodies 33, 34, and 35 is operated by hydraulic cylinders 36, 37, and 38, and oil from the hydraulic device similar to the hydraulic jack 2 is used for the hydraulic cylinders 36 to 38.

  Here, as shown in detail in FIG. 2, innumerable irregularities are formed on the surfaces of the pressing bodies 33 to 35, and the pressing cylinders 33 to 35 are operated by simultaneously operating the hydraulic cylinders 36 to 38. Are simultaneously brought into contact with the surface of the steel pipe SP and pressed toward the center line of the steel pipe SP from three locations, and the steel pipe SP is held by the three pressing bodies 33 to 35 by balancing these pressing forces. It becomes. Therefore, the holding means is constituted by the whole of the pressing bodies 33 to 35 and the hydraulic cylinders 36 to 38. In order to balance the pressing forces of the three pressing bodies 33 to 35, for example, in a plan view, the forward and backward directions of the pressing bodies 33 to 35 are 120 ° with the center point of the through hole 31 as the center. It is arranged radially with an angle, and these pressing bodies 33 to 35 are made possible by pressing the steel pipe SP with the same pressing force. In the present embodiment, the pressing force is balanced by pressing from the above three directions, but it is also possible to adopt a configuration in which the two pressing bodies are arranged in opposite directions.

  The motor 4 is a so-called hydraulic motor, and can generate a rotational driving force by supplying oil by the hydraulic device described above. As shown in FIG. 3, the motor 4 is attached to the upper end of the steel pipe SP. As described above, in a state where the steel pipe SP is held by pressing of the pressing bodies 33 to 35, the steel pipe SP is Since it is integrated with the slider 3, the motor 4 is also integrated with the slider 3. And the drive shaft 41 of this motor 4 is arrange | positioned inside the steel pipe SP, and can be connected to the below-mentioned auger screw OS. Therefore, the main body portion of the motor 4 is fixedly supported by the steel pipe SP, and the auger screw OS can be rotationally driven inside the steel pipe SP.

  The auger screw OS includes a rotation shaft at the center and a spiral screw portion around the rotation shaft. When the rotation shaft rotates, the auger screw OS can be conveyed according to the spiral shape of the screw portion. That is, when the auger screw OS rotates inside the steel pipe SP, the earth and sand taken in from the tip of the steel pipe SP is conveyed by the screw portion of the auger screw OS. And when this conveyance direction is back of the auger screw OS, the earth and sand taken in from the front-end | tip of the steel pipe SP can be conveyed to the rear end of the steel pipe SP.

  As described above, the base 1 is a quadrilateral plate-like member in plan view, and the weight placing trays 12 and 13 can be mounted along each side of the quadrilateral ( (See FIG. 2). The weight mounting trays 12 and 13 can be fastened by bolts or the like in the vicinity of the side of the base 1, and are arbitrarily attached at one to four places on the base 1. In general, the hydraulic jack 2 is mounted symmetrically near the plane portion of the base 1 on which the hydraulic jack 2 is erected, but can be freely adjusted according to the situation of the surrounding structure where the base 1 is to be installed. It can be arranged. In addition, positioning members are erected on the weight loading trays 12 and 13 at the positions of the four corners of the substantially quadrangular shape so that the positions of the weights W of the substantially quadrangular shape in plan view are not changed. Further, the weight W is also provided with positioning plate members on four sides, and the whole is stabilized when a plurality of weights W are stacked and placed.

  Since the configuration is as described above, as shown in FIG. 4, the slider 3 is raised by operating the cylinder of the hydraulic jack 2, and then the hydraulic cylinders 36 to 38 that advance and retract the pressing bodies 33 to 35 are operated. The pressing bodies 33 to 35 are brought into contact with the steel pipe SP, and further, the hydraulic motor 4 is operated to rotate the auger screw OS disposed inside the steel pipe SP. By operating and lowering the slider 3, the steel pipe SP and the auger screw OS can be pressed into the ground.

  Then, by pressing the slider 3 up and down a plurality of times, it is possible to realize press-fitting for a desired length. Here, when the slider 3 is moved up and down, the operation of the motor 4 is stopped at the time when the first descent is finished, and then the pressing of the pressing bodies 33 to 35 is released, and the slider 3 is lifted to raise the original. Need to return to position. This is because if the operation of the motor 4 is not stopped, the steel pipe SP supporting the motor 4 is released from the fixed state by releasing the pressing members 33 to 35. After the slider 3 is lifted, the steel pipe SP is pressed again by the pressing bodies 33 to 35, the motor 4 is operated, and then the slider 3 is lowered, so that the press-fitting can be continued.

  In the present embodiment, a male screw is engraved at one end of the steel pipe SP and a female screw is engraved at the other end so that the same kind of steel pipe SP can be added. In this case, the connection between the steel pipe SP and the motor 4 includes a method of connecting the adapter 5 to which the motor 4 is mounted to the steel pipe SP. Specifically, a part of the adapter 5 is provided with a male screw portion for connection with the steel pipe SP, and this is screwed into a female screw at the other end of the steel pipe SP. Accordingly, the steel pipe SP can be attached to and detached from the steel pipe SP, and the motor 4 can be detached from the press-fitted steel pipe SP when the steel pipe SP is added, and can be easily attached to the added steel pipe SP.

  Next, an embodiment of the present invention relating to the rainwater infiltration pipe burying method will be described with reference to FIGS. In this embodiment, the rainwater infiltration digging apparatus is used. Since the rainwater infiltration mine excavation device has the above-described configuration, the rainwater infiltration mine excavation device is installed at a predetermined position. Moreover, after excavating a rainwater infiltration mine using the steel pipe SP and the auger screw OS, the rainwater infiltration pipe is embedded using the steel pipe SP.

  Therefore, as shown in FIG. 4, first, the rainwater infiltration burial device is installed so that the through hole 11 of the base 1 matches the position where the rainwater infiltration pipe should be embedded. Then, the steel pipe SP is inserted through the through hole 11 of the base 1 and the through hole 31 of the slider 3 so that the longitudinal direction is set up and down. At this time, the mouth guide 6 is provided so that the opening of the LM where the steel pipe SP is located does not collapse due to contact with the steel pipe SP. The first mouth guide 6 is a metal guide formed in a cylindrical shape, and a part of the guide 6 can enter the street LM from the opening of the street LM.

  Subsequently, the auger screw OS is inserted into the steel pipe SP, and the rear end (upper end) is connected to the drive shaft of the motor 4. The motor 4 is also connected to the rear end (upper end) of the steel pipe SP at the same time when the rear end of the auger screw OS is connected, and the installation of each member is completed. In the initial installation of the steel pipe SP and the auger screw OS, it is also possible to install the motor 4 integrally in the apparatus with the motor 4 connected in advance to the steel pipe SP and the auger screw OS. In the initial installation state, the slider 3 is in the raised position.

  After the installation is completed as described above, the steel pipe SP is held by the pressing bodies 33 to 35, the motor 4 is started, and the slider 3 is lowered (FIG. 5A). By the lowering of the slider 3, the auger screw OS excavates the earth and sand, and the earth and sand generated at that time can be transported upward in the steel pipe SP by the auger screw OS. Note that an adapter 5 for mounting the motor 4 is provided at the rear end (upper end) of the steel pipe SP. Since the adapter 5 is provided with a soil removal hole 51 for soil removal, the adapter 5 is transported. The earth and sand can be discharged to the outside of the steel pipe SP.

  When the lifting / lowering stroke of the slider 3 by the hydraulic jack 1 is large, the slider 3 is lowered once to enable the press-fitting of each one of the steel pipe SP and the auger screw OS. In order to press-fit each one of the steel pipe SP and the auger screw OS, the slider 3 is moved up and down several times. That is, since the steel pipe SP and the auger screw OS can be press-fitted only when the slider 3 is lowered, a part (for example, one third) of the total length of the steel pipe SP and the auger screw OS is caused by the lowering of one stroke. ) Is press-fitted, the holding of the steel pipe SP by the pressing bodies 33 to 35 supported by the slider 3 is released, the slider 3 is raised, and the slider 3 is lowered again while holding the steel pipe SP. It will be. By repeating this several times (for example, three times), one steel pipe SP and one auger screw OS can be press-fitted.

  In addition, when repeating raising / lowering of the slider 3 as mentioned above, it is necessary to stop the operation of the motor 4 before releasing the holding of the steel pipe SP by the pressing bodies 33 to 35 supported by the slider 3. Is as described in the embodiment of the apparatus. Moreover, the state where the press-fitting is started is a state in which the steel pipe SP and the tip (lower end) of the auger screw OS reach the bottom of the street LM. Since the range is a part of the whole, the press-fitting for one in the above description means a range excluding the depth of the street LM.

  Following the above process, in order to press-fit the steel pipe SP and the auger screw OS to a deeper position, a new similar steel pipe SP and auger screw OS are added to the already-fitted steel pipe SP and the auger screw OS, and the press-fitting is repeated. . Here, in order to add the new steel pipe SP and the auger screw OS, it is necessary to remove the motor 4 installed at the rear end (upper end) of the steel pipe SP and the auger screw OS. Therefore, first, the connection with the steel pipe SP is released. However, when a female screw is engraved in the steel pipe SP, the adapter 5 may be detached from the steel pipe SP. The disengagement method should just cancel a screwing state. If the connection between the drive shaft and the auger screw OS is a spline connection or the like, the connection can be released by pulling out the motor 4 (FIG. 5B).

  Thus, after removing the motor 4 from the steel pipe SP and the auger screw OS, the new steel pipe SP and the auger screw OS are coupled to the rear ends (upper ends) of the press-fitted steel pipe SP and the auger screw OS. This connection can be performed by screwing the steel pipe SP, and can be performed by inserting the auger screw OS into the spline shaft. Then, after connecting the new steel pipe SP and the auger screw OS, the press-fitting can be continued by connecting the motor 4 again to the rearmost end (uppermost end) (FIG. 6A).

  Subsequently, by operating the motor 4 and lowering the slider 3, the new steel pipe SP and the auger screw OS can be press-fitted (FIG. 6B). Depending on the stroke of the hydraulic jack 2, the slider 3 is moved up and down a plurality of times (FIGS. 7A and 7B). When the steel pipe SP and the auger screw OS are further added, the above is repeated to excavate the rainwater infiltration mine reaching a desired depth, and at the same time, the steel pipe SP is buried in the infiltration mine. (FIG. 8A). In FIG. 8A, a desired depth is defined as a state where the press-fit lengths L1 and L2 corresponding to two steel pipes SP are reached.

  When the steel pipe SP and the auger screw OS are press-fitted to a desired depth, the press-fitting of the steel pipe SP and the auger screw OS is stopped, the auger screw OS is removed, and the steel pipe SP is left (FIG. 8 ( b)). At this time, since the inside of the steel pipe SP is hollow (the excavated sediment is also discharged), the rainwater permeation pipe WP is inserted in a range up to a predetermined depth by inserting the rainwater permeation pipe WP into the hollow interior. Can be installed (FIG. 8C).

  At this time, the rainwater permeation pipe WP to be inserted uses a perforated pipe having a drainage through-hole formed at least in the peripheral portion near the tip. This is because even a normal vinyl chloride pipe functions as a permeation pipe, but if the ground near the tip of the laying area is a permeable ground, the permeation efficiency to the surrounding ground can be improved by using a perforated pipe.

  Following the above-described process, the inside filter IF is filled in the rainwater permeation pipe WP (FIG. 9A). As the filling range of the internal filter IF is wider, the filter effect is improved, so that the inner filter IF is almost entirely filled. As the filter, an adsorbent capable of adsorbing and removing harmful heavy metals, oil, COD components and the like in rainwater is used. For example, a long fiber nonwoven fabric can be used. The adsorbent is composed of inorganic or organic particulates or fibers, and is integrated into a cylindrical net to form a columnar internal filter IF as a whole. The cylindrical net is preferably configured to be in close contact with the inside of the rainwater infiltration pipe WP, and the material is preferably a material having corrosion resistance such as plastic or stainless steel. Also, for the integration of the adsorbent and the cylindrical net, the adsorbent having individual adsorbing performance such as harmful heavy metal adsorbent, oil adsorbent and COD component adsorbent is enclosed simultaneously. it can. At this time, these individual adsorbents can be encapsulated in layers, but can also be encapsulated after mixing the whole.

  Further, the steel pipe SP is pulled out and removed, and an outer filter OF is filled around the steel pipe SP (FIG. 9B). In the state where the steel pipe SP is pulled out, a gap is formed between the rainwater infiltration pipe WP and the ground, which is almost the same as the thickness of the steel pipe SP, and therefore the external filter OF is inserted into this gap. Here, the external filter OF can be easily inserted by making it cylindrical as shown in the figure, but is not limited to such a shape.

  As described above, the rainwater infiltration pipe WP can be buried deeply underground from the street LM, and the inner filter IF and the outer filter OF can be filled inside (FIG. 9C). ). The external filter OF is used when there is a gap between the rainwater infiltration pipe WP and the ground when the steel pipe SP is removed. For example, when the steel pipe SP is removed in the soft ground, the gap is not maintained. It is not used for.

  Next, an embodiment of the rainwater infiltration structure will be described. As shown in FIG. 9C, the present embodiment is configured by the above-described method, and in the above-described method, the steel pipe SP is removed and the filters IF and OF are filled. More specifically, the rainwater infiltration pipe WP is laid in a range from the street LM to the permeable ground, and the upper end of the rainwater penetration pipe WP is opened inside the street LM. The vicinity of the lower end of the rainwater permeation pipe WP is constituted by a perforated pipe, and the perforated pipe is installed at least on the permeable ground. The filters IF and OF are filled almost entirely including the perforated pipe.

  Since it is configured in this way, the rainwater flowing into the street LM passes through the inside of the rainwater permeation pipe WP and permeates into the ground in the perforated pipe at the tip and the external filter OF. Since it also passes through the internal filter IF, oil, metals and the like are removed. In addition, as described above, the filters IF and OF use a filter having a relatively large gap, so that clogging is hardly generated, and sufficient purification can be performed by contacting the filter over a long range. To do.

  The embodiment of the present invention is as described above, but various modes can be taken without departing from the spirit of the present invention. For example, the auger screw OS used in the rainwater penetration hole excavating apparatus has been described as having a spiral screw portion in the periphery. However, as shown in the figure, a drilling cutter HC ( The one with FIG. 4) can be used. That is, the initially installed auger screw OS that should be the top must not only excavate the ground but also penetrate the bottom of the street LM at the same time. If the HC is provided, the bottom of the street LM can be penetrated by operating the device. In the case of a configuration that does not include the above-described hole cutter HC, a through-hole having a predetermined diameter may be drilled in advance at the bottom of the street LM.

  In addition, it has been described that the rotational driving force is transmitted by spline coupling to the auger screw OS extension, but the present invention is not limited to this, and a male pin and a female die are inserted and a through pin is inserted. It is also possible to use a means for engraving male screws and female screws and screwing them together.

  Furthermore, regarding the connection of the steel pipe SP, the positions of the male screw and the female screw can be configured to be reversed, and the connection using a joint or the like is also possible. In addition, when the positions of the male screw and the female screw are reversed, it is natural that the screw portion provided in the adapter 5 becomes a female screw.

DESCRIPTION OF SYMBOLS 1 Base 2 Hydraulic jack 3 Slider 4 Motor 5 Adapter 6 Mouth guide 11 Through-hole 12, 13 Weight mounting tray 31 Through-hole 32 Planar part 33, 34, 35 Press body 36, 37, 38 Hydraulic cylinder 41 Drive shaft 51 Excavation hole HC Drilling cutter LM Townhouse SP Steel pipe OS Auger screw WP Infiltration pipe IF Internal filter OF External filter L1, L2 Press fit length W Weight

Claims (12)

Rainwater for laying the rainwater permeation pipe by simultaneously press-fitting a metal pipe body having an inner diameter that allows the rainwater permeation pipe to be laid and an auger screw rotatable inside the metal pipe body. An apparatus for providing a seepage pit,
A base having a through-hole through which the metal tube can be inserted, a hydraulic jack erected on the base, a slider supported by the hydraulic jack and movable up and down, and a metal pipe supported by the slider A rainwater seepage mine excavator comprising: a holding means for holding a body; and a motor that is supported on an upper portion of the metal pipe and rotates the auger screw. The metal pipe body is a steel pipe formed by engraving a male screw on the outer surface near one end and a female screw on the inner surface near the other end, and the motor can be screwed to the other end of the steel pipe. The rainwater infiltration mine excavator according to claim 1, wherein the excavator is a motor fixed to the steel pipe via an adapter. The rainwater seepage mine excavator according to claim 1 or 2, wherein the holding means is constituted by a plurality of pressing bodies that can be pressed in the center direction from the periphery of the metal pipe body. 4. The rainwater infiltration mine excavation device according to claim 1, wherein the base is a base on which a weight mounting tray on which a weight can be mounted can be mounted. 5. 5. The base is a base configured in a quadrilateral plate shape, and the weight mounting tray is a weight mounting tray that can be mounted on any side of the quadrilateral of the base. The rainwater seepage mine excavator as described. The rainwater infiltration digging apparatus according to any one of claims 1 to 5, wherein the auger screw is an auger screw having a drilling cutter at a tip. A rainwater infiltration pipe laying method using the rainwater infiltration mine excavation device according to any one of claims 1 to 6,
Configure the length of the metal tube and auger screw to match the number of strokes of the hydraulic jack,
The base is installed around the upper opening of the street wall where the rainwater infiltration pipe should be buried,
While holding the metal pipe body by the holding means, arrange an auger screw inside the metal pipe body,
The motor is installed at the upper end of the metal tube, and the drive shaft of the motor is connected to the rotation shaft of the auger screw.
While rotating the auger screw, the metal pipe body and the auger screw are simultaneously lowered by lowering the slider to penetrate the bottom of the street, and the metal pipe body and the auger screw are brought into the ground. Press fit into
At the end of the predetermined lowering, release the holding of the metal tube by the holding means, and after removing the motor from the auger screw, raise the slider,
The same type of metal tube and auger screw are added to the upper ends of the already press-fitted metal tube and auger screw, the metal tube is held by the holding means, and the motor is installed on the upper end of the metal tube. After connecting with the auger screw, press the metal tube and auger screw again,
Repeat the above operation, press the metal tube and auger screw to the expected depth, remove the auger screw, insert the rainwater infiltration tube into the remaining metal tube, and insert the rainwater infiltration tube into the rainwater infiltration tube. A rainwater infiltration pipe laying method characterized by removing a metal tube after filling a replaceable internal filter. The rainwater permeation pipe laying method according to claim 7, wherein after the metal pipe body is removed, an external filter is filled in a gap formed by the removal of the metal pipe body. The rainwater permeation pipe laying method according to claim 7 or 8, wherein the filter is filled with a filter made of a material capable of adsorbing or capturing oil and metal components throughout the rainwater permeation pipe. A rainwater infiltration structure constituted by the rainwater infiltration pipe laying method according to claim 7,
A rainwater infiltration structure characterized in that a rainwater infiltration pipe is laid in a range reaching the permeable ground while penetrating the bottom of the street wall, and an internal filter is filled in almost the entire area of the rainwater infiltration pipe. A rainwater infiltration structure constituted by the rainwater infiltration pipe laying method according to claim 8,
A rainwater infiltration pipe is laid in the area reaching the permeable ground while penetrating the bottom of the street mast, and the inner filter is filled almost inside the rainwater infiltration pipe, and the outer filter is filled outside. A rainwater infiltration structure characterized by that. The rainwater infiltration structure according to claim 10 or 11, wherein the rainwater infiltration pipe is a rainwater infiltration pipe in which at least a portion installed on the permeable ground is constituted by a perforated pipe.

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