JP6788491B2 - Supporting jig for multi-stage pipe and penetration method for multi-stage pipe - Google Patents

Description

The present invention relates to a bearing jig for a multi-stage pipe having a plurality of pipe bodies having different pipe diameters and to be penetrated into the ground, and a method for penetrating the multi-stage pipe.

When the ground slopes such as embankments, cuts, and residential land development sites that accompany the construction of railways and roads collapse when the amount of precipitation exceeds the penetration capacity of the ground and the groundwater level rises or the water content of the ground rises. There is. For this reason, draining the water in the ground lowers the groundwater level and the water content ratio of the ground, and in order to lower the water pressure and prevent the slope from collapsing, a water collection port (drainage hole) for collecting water in the ground. ), A drainage pipe provided with a slit on the peripheral surface of the pipe is conventionally penetrated into the ground. In addition, the rear end of the pipe is exposed from the ground (ground surface, ground, slope, etc.) in order to ensure that the water collected from the ground is drained from the ground.

However, when the length of the drainage pipe becomes long, the friction between the peripheral surface of the drainage pipe and the ground (hereinafter referred to as peripheral friction) increases, so that the drainage pipe cannot easily penetrate. Therefore, in order to prevent an increase in peripheral friction with the ground at the time of penetration, a plurality of pipe bodies having different pipe diameters are provided, and another pipe body is inserted into the pipe body having the largest pipe diameter among the plurality of pipe bodies. A method of penetrating a multi-stage drainage pipe that penetrates into the ground in this state and then penetrates into the ground with another pipe that is inserted into the pipe with the largest diameter has been conventionally proposed. ..

For example, Patent Document 1 eliminates the need for a step of pre-drilling a hole in a punched portion using a drilling machine, which is called pre-boring, so that the driving work can be easily performed and the construction labor can be reduced. Drainage pipes and their driving methods have been proposed. Specifically, inside the first pipe body in which the inner diameter of the tip portion is further reduced, the diameter of the main pipe portion having a diameter smaller than the inner diameter of the tip portion of the first pipe body and the diameter being larger than the inner diameter thereof are increased. With the second pipe body having the root portion inserted, these are driven into the slope, the root portion of the second pipe body is pressed, the main pipe portion is projected from the first pipe body, and further. The root portion is locked to the tip portion in the first tube body.

In the invention proposed in Patent Document 1, peripheral friction can be generated only in the extruded pipe body, and the occurrence of peripheral friction can be prevented in the other pipe bodies. Therefore, when the total length of the drainage pipe is long, it is possible to reduce the peripheral friction at the time of driving into the slope, and it is possible to improve the ease of driving the drainage pipe.

Further, although it is not a drainage pipe, Patent Document 2 states that on-site welding work is not required, the pile diameter can be increased, and the pile body is prevented from rising even when liquefaction occurs during an earthquake. In order to do so, a tubular steel pipe pile main body, a tapered tapered portion provided at the lower end portion of the steel pipe pile main body and whose outer diameter and inner diameter taper toward the bottom, and an upper end portion of the steel pipe pile main body are provided. Therefore, a tapered pile having a tapered portion whose outer diameter and inner diameter become thicker toward the upper side has been proposed.

In the invention proposed in Patent Document 2, when connecting the tapered piles at both ends in the pile axis direction, among the tapered piles at both ends adjacent to each other in the pile axis direction, the steel pipe pile main body of the tapered piles at both ends at the upper end is the tapered pile at both ends at the lower end. The diameter is larger than that of the steel pipe pile body, and the inner diameter of the tapered taper on both ends of the upper end is engaged with the outer diameter of the tapered taper on both ends of the lower end. By engaging the inner diameter of the tapered taper of the lower end taper pile with the outer diameter of the tapered taper, it is possible to easily connect the tapered piles on both ends adjacent to each other in the pile axis direction, and the conventional welding work. Is no longer needed.

Japanese Unexamined Patent Publication No. 2015-166519 JP 2015-175193

However, when the multi-stage drainage pipe or tapered pile disclosed in Patent Document 1 and Patent Document 2 is penetrated into the ground, the drainage pipe is used from the tip and the water collecting port (drainage hole), and the tapered pile is used. Sediment may flow into the pipe from the tip, or when a concrete breaker or the like is used, the sediment may flow into the pipe due to fluidization due to vibration. In particular, when the ground is highly water-containing or the gap ratio is large, in the so-called "loose" state, when constructing with a long pipe length, the pipe diameter inserted inside the multi-stage pipe is small. The pipe body (hereinafter, the second pipe body) is pushed to the normal position (normal locking position) in the pipe body having a large diameter (hereinafter, the first pipe body) arranged outside the second pipe body. It is difficult, and there is a risk that the multi-stage pipe will be pulled into the earth and sand to a depth not intended by the installer due to vibration. Such a phenomenon is caused by the normal position (normal locking) of the second pipe inserted inside the multi-stage pipe in the first pipe having a large diameter, which is arranged outside the second pipe. In the case of construction that is required to be pushed to the position), it is generated when the earth and sand that has flowed into these pipes bite between the first pipe and the second pipe when the second pipe is penetrated. In addition, since the peripheral surface friction between the peripheral surface of the pipe body and the ground is small in the loose ground, the rear end of the pipe body exposed from the ground of the multi-stage pipe is also drawn into the ground and collects water. Water may flow into the ground without being drained outside the ground.

The present invention has been made to solve the above problems, and it is possible to prevent the multi-stage pipe from being pulled into the ground even when it penetrates into the ground in a loose state. It is an object of the present invention to provide a method for penetrating a jig and a multi-stage pipe.

In order to achieve the above object, the first invention of the present invention is a pressure bearing jig for a multi-stage pipe having a plurality of pipe bodies having different pipe diameters and penetrating into the ground. , It is locked in a locking portion provided at the rear end of the pipe body exposed from the ground among the plurality of pipe bodies, comes into contact with the ground, and occurs in a direction in which the multi-stage pipe penetrates into the ground. The reaction force generated between the pipe and the ground causes a resistance force that repels the pulling force to act on the pulling force of the pipe, and the bearing jig has a notch that is narrower than the width of the locking portion. wherein the notch is characterized Rukoto through communication with the multi-stage pipe.

The second invention of the present application is a pressure bearing jig for a multi-stage pipe having a plurality of pipe bodies having different pipe diameters and penetrating into the ground, and the pressure bearing jig is the ground among the plurality of pipe bodies. With respect to the pulling force of the pipe generated in the direction in which the multi-stage pipe is intruded into the ground by being locked by a locking portion provided at the rear end of the pipe body exposed from the above. the reaction force generated between the ground, by the action of resisting force to repel the pulling force, the bearing capacity jig is characterized Rukoto which have a gripping mechanism for obtaining said resistance.

Third aspect of the present invention, the bearing capacity jig is provided with a small through-hole diameter than the outer diameter of the locking portion, the through hole is characterized Rukoto through communication with the multi-stage pipe.

Fourth aspect of the present invention, the through hole is characterized in a long hole shape der Rukoto in a plan view.

The present fifth invention, the bearing capacity jig is provided with a narrow notch width than the width of the locking portion, wherein the notch is characterized Rukoto through communication with the multi-stage pipe.

The present sixth invention, the locking portion is characterized Rukoto such is provided a separate member from said tubular body to the rear end portion of the tubular body exposed from the ground.

The present seventh invention, the bearing capacity jig, by the locking portion, detachably engaged in the axial direction or the direction perpendicular to the axis of the multi-stage pipe, characterized in Rukoto.

The present eighth invention, the locking portion is characterized Rukoto such formed integrally with the rear end portion of the exposed tube from the ground.

The present ninth invention, wherein the plurality of tubes, characterized that you have each a plurality of drain holes are formed.

The present tenth invention, the bearing capacity jig is characterized Rukoto which have a gripping mechanism for obtaining the resistance to pull into sediment of the multi-stage pipe.

The present eleventh invention, the gripping mechanism is characterized Rukoto to having a through-hole.

According to the first to eleventh inventions of the present application, when the multi-stage pipe is penetrated into the ground, the bearing jig is locked to the locking portion provided at the rear end of the pipe body exposed from the ground. By contacting the ground, the reaction force generated between the multi-stage pipe and the ground causes a resistance force that repels the pulling force to act on the pulling force of the pipe generated in the direction in which the multi-stage pipe penetrates into the ground. Can be done. As a result, the resistance to pulling in when the multi-stage pipe penetrates into the ground increases, and the pulling of the multi-stage pipe into the ground can be prevented. Therefore, even if the ground is in a so-called "loose" state, it is possible to prevent the multi-stage pipe from being drawn into the ground.

In particular, according to the third invention, a through hole having an inner diameter smaller than the width of the locking portion is provided, and the through hole communicates with the multi-stage pipe. Therefore, this bearing jig is exposed from the ground. By installing it between the locking part provided at the rear end and the ground, the multi-stage pipe is securely locked to the bearing jig, and the bearing jig comes into contact with the ground. The reaction force from the ground can effectively prevent the multi-stage pipe from being pulled into the ground.

In particular, according to the fourth invention of the present application, since the through hole has an elongated hole shape in a plan view, the pressure bearing jig can be installed at an angle with respect to the axial direction of the multi-stage pipe. Therefore, even in the case of a through hole, the bearing jig can be installed so that the plane of the bearing jig is parallel to the ground regardless of the inclination angle of the ground. As a result, the contact area between the bearing jig and the ground increases, and the resistance to pulling the multi-stage pipe into the ground increases. As a result, it is possible to more effectively prevent the multi-stage pipe from being drawn into the ground. Further, since the multi-stage pipe is regulated in the left-right direction, it is possible to prevent lateral movement when the multi-stage pipe penetrates.

Further, according to the fifth invention of the present application, since the notch portion having a width narrower than the width of the locking portion is provided and the notch portion communicates with the multi-stage pipe, the bearing jig is provided in the axial direction of the multi-stage pipe. It can be installed at an angle. Therefore, the bearing jig can be installed so that the plane of the bearing jig is parallel to the ground regardless of the inclination angle of the ground. As a result, the contact area between the bearing jig and the ground increases, and the resistance to pulling the multi-stage pipe into the ground increases. As a result, it is possible to more effectively prevent the multi-stage pipe from being drawn into the ground. Further, since the multi-stage pipe is regulated in the left-right direction, it is possible to prevent lateral movement when the multi-stage pipe penetrates.

In particular, according to the sixth invention of the present application, since a separate member different from the pipe body is provided at the rear end portion of the pipe body whose locking portion is exposed from the ground, it can be applied to an existing multi-stage pipe. ..

In particular, according to the seventh invention of the present application, since the bearing jig is detachably locked by the locking portion, the bearing jig is attached only at the time of penetrating the multi-stage pipe, and the bearing is supported when the construction is completed. The pressure jig can be easily removed. Therefore, since the bearing jig can be reused, it is possible to continuously perform the penetration work of the multi-stage pipe, shorten the construction period required for the penetration work of the multi-stage pipe, and perform the penetration work of the multi-stage pipe. The cost for manufacturing the bearing bearing jig can be kept low.

In particular, according to the eighth invention of the present application, since the locking portion is integrally molded with the rear end portion of the pipe body exposed from the ground, a step of providing the locking portion at the rear end portion of the pipe body in advance or in the field. The step of attaching the locking portion can be omitted without the need for.

In particular, according to the ninth invention of the present application, since a plurality of drain holes are formed in each of the plurality of pipe bodies, earth and sand easily flow into the pipe body through the drain holes, but by installing a bearing jig. , The resistance to the pulling of the multi-stage pipe into the ground is increased, and the pulling of the multi-stage pipe into the ground can be prevented. Therefore, it can be suitably used for a multi-stage drainage pipe in which such a drainage hole is formed.

In particular, according to the tenth invention of the present application, since it has a gripping mechanism for obtaining a resistance force against pulling the multi-stage pipe into the ground, the gripping mechanism has a resistance force against pulling the multi-stage pipe. By fixing a wire rope, a chain, or the like to a structure such as a construction stand or a fence and stretching it in the direction in which the above occurs, the resistance force of the bearing force jig can be increased. Therefore, it is possible to prevent the multi-stage pipe from being pulled into the ground even when the ground is looser.

In particular, according to the eleventh invention of the present application, an eyebolt or the like can be fixed to the through hole, and a wire rope or a chain or the like can be fixed to the eyebolt to a structure such as a construction stand or a fence and stretched. Further, when the eyebolt or the like is removed, the bearing jig can be accommodated without taking up space because there is no protruding portion.

(A) It is a top view of the pressure bearing jig of the multistage pipe which concerns on embodiment of this invention. (B) It is a side view of the pressure bearing jig of the multistage pipe which concerns on embodiment of this invention. (A) It is a perspective view of the pressure bearing jig of the multistage pipe which concerns on embodiment of this invention. (B) Side view showing the pull-in of the pipe generated in the direction in which the multi-stage pipe according to the embodiment of the present invention penetrates into the ground, and the resistance force due to the reaction force generated between the bearing jig and the ground. Is. It is a perspective view which fixed the eyebolt to the bearing jig of the multi-stage pipe which concerns on embodiment of this invention, and stretched the wire to the eyebolt. It is sectional drawing which represented typically the cross section of the slope of the soil which installs the multistage drainage pipe which concerns on embodiment of this invention. It is a side view which shows the multi-stage drainage pipe of the same above with the middle omitted. It is a top view of the attachment which constitutes the locking part provided at the rear end part of the 1st pipe body of a multi-stage drainage pipe. The joint shape which is the joint part between the 1st pipe body and the 2nd pipe body of the above-mentioned multi-stage drainage pipe is shown in the cross-sectional view of the 1st pipe body part, and the 2nd pipe body part is shown in the side view. Is. It is a partially enlarged cross-sectional view which shows the state which cut the tip part of the multi-stage drainage pipe of the same above, along the pipe axis direction. It is a side view which shows the extrusion jig of the multistage drainage pipe which concerns on embodiment of this invention. It is a figure explaining the inflow of earth and sand into the multi-stage pipe which concerns on this embodiment. It is a figure explaining the state that the earth and sand which flowed into the multi-stage pipe which concerns on this embodiment are clogged. It is a flowchart which shows the process of the penetration method of the multi-stage drainage pipe which concerns on embodiment of this invention. It is a photograph showing the pedestal installation process of the above-mentioned multi-stage drainage pipe penetration method. It is a process explanatory drawing which shows the extrusion jig assembly process of the above-mentioned multistage drainage pipe penetration method. It is a process explanatory view which shows the 1st pipe body extrusion process of the above-mentioned multi-stage drainage pipe penetration method. It is a process explanatory drawing which shows the bearing jig installation process of the penetration method of a multi-stage drainage pipe. It is a process explanatory drawing which shows the extrusion plate replacement process of the penetration method of the multi-stage drainage pipe of the same above. It is a process explanatory view which shows the 2nd pipe body extrusion process of the above-mentioned multi-stage drainage pipe penetration method. It is a process explanatory view which shows the 3rd pipe body extrusion process of the above-mentioned multi-stage drainage pipe penetration method. (A) It is a perspective view of the pressure bearing jig of a multi-stage pipe which concerns on the modification of embodiment of this invention. (B) It is a perspective view which fixed the eyebolt to the pressure bearing jig of the multistage pipe which concerns on the modification of embodiment of this invention, and stretched the wire to the eyebolt.

Hereinafter, the pressure bearing jig for the multi-stage pipe and the penetration method for the multi-stage pipe according to the embodiment of the present invention will be described in detail with reference to the drawings. In the following, an embodiment will be described as an example of a multi-stage drainage pipe in which drainage holes are bored in each pipe body constituting the multi-stage pipe, but the multi-stage pipe is a multi-stage drainage pipe. For example, a multi-stage pile (tapered pile) and the like are also included in the technical scope of the present invention.

<Supporting jig for multi-stage pipe>
First, the configuration of the bearing jig 20 (hereinafter, simply referred to as the bearing jig 20) of the multi-stage drainage pipe 10 of the present embodiment will be described with reference to FIGS. 1 to 3, 5 and 6. ..

The bearing jig 20 is used to prevent the multi-stage drainage pipe 10 from being drawn into the ground when the multi-stage drainage pipe 10 is penetrated into the ground. Specifically, the pressure bearing jig 20 is provided by a locking portion 11c provided at the rear end of the multi-stage drainage pipe 10 exposed from the ground (see FIGS. 5 and 6 for the locking portion 11c). , It is detachably locked to the multi-stage drainage pipe 10. As shown in FIG. 2B, the pressure bearing jig 20 comes into contact with the ground, and is between the bearing Q and the ground with respect to the pipe pull-in Q generated in the direction in which the multi-stage drainage pipe 10 penetrates into the ground. The reaction force generated in the above causes a resistance force R that repels the pull-in Q to act on the pull-in Q to prevent the multi-stage drainage pipe 10 from being pulled into the ground.

As shown in FIG. 1, the pressure bearing jig 20 is a flat rectangular plate-shaped member, and has a notch portion 21, a plurality of first holes 22, and a second hole 23. The notch 21 is provided by notching in the direction of the side 20C from the substantially central portion of the bearing jig 20. The width W1 of the notch 21 is narrower than the width W3 of the locking portion 11c provided at the rear end of the multi-stage drainage pipe 10 described later. By making the width W1 of the notch 21 narrower than the width W3 of the locking portion 11c, the locking portion 11c is securely locked to the bearing jig 20, and the multi-stage drainage pipe 10 is pulled into the ground Q. Can be prevented. In this embodiment, the width W3 means the maximum width (widest width) of the locking portion 11c.

Further, since the cutout portion 21 is cut out in the direction of the side 20C, the bearing jig 20 is placed in front of the locking portion 11c of the multi-stage drainage pipe 10, that is, with the locking portion 11c of the multi-stage drainage pipe 10. Installation of the bearing jig 20 is completed by a simple operation of inserting it between the ground and the ground. Therefore, the bearing jig 20 can be installed without bothering the construction worker, and has almost no effect on the construction of the multi-stage drainage pipe 10.

Further, since the notch portion 21 is provided, the bearing jig 20 can be installed at an angle with respect to the axial direction of the multi-stage drainage pipe 10. Therefore, as shown in FIG. 2B, the pressure bearing jig 20 is parallel to the ground regardless of the inclination angle of the ground through which the multi-stage drainage pipe 10 is penetrated. 20 can be installed. As a result, the contact area between the bearing jig 20 and the ground is increased, the resistance force R of the multi-stage pipe to the pull-in Q into the ground is increased, and the pull-in Q of the multi-stage drainage pipe 10 into the ground is more effective. Can be prevented. Further, since the multi-stage drainage pipe 10 is regulated in the left-right direction (Y-axis direction in FIG. 1), it is possible to prevent lateral movement when the multi-stage drainage pipe 10 penetrates.

The plurality of first holes 22 form a gripping mechanism for obtaining a resistance force R against the pulling Q of the multi-stage pipe into the ground, and the same number of the first holes 22 are provided on the opposite edge portions of the bearing jig 20. There is. In the example shown in FIG. 1, three first holes 22 are provided at the edge portions of the opposite sides 20B and 20D. The first hole 22 is a through hole provided so that a wire rope, a chain, or the like (hereinafter, referred to as a wire or the like) can be stretched. When the wire or the like is stretched, as shown in FIG. 3, the direction in which the resistance R is generated against the pull-in Q of the multi-stage drainage pipe 10 to be penetrated after the eyebolt 31 is fixed to the first hole 22 (arrow). Wire 32 or the like is stretched in the direction of). The bolt to be fixed to the first hole 22 is preferably one in which a wire such as an eyebolt is fixed to a structure such as a construction stand or a fence and is easily stretched, but other types of bolts may be used. The direction of the arrow shown in FIG. 3 is an example, and may be any other direction as long as the resistance R is generated against the lead-in Q of the multi-stage drainage pipe.

Further, the bolt may not be fixed in the first hole 22, and the wire or the like may be directly inserted into the first hole 22. Further, in the embodiment, the first hole 22 is a through hole in consideration of the plate thickness of the pressure bearing jig 20. However, it does not necessarily have to be a through hole, and if the bearing jig 20 has a sufficient plate thickness and the possibility that the bolt will come off is low, the hole may not penetrate the first hole 22. Further, the first hole 22 of the bearing jig 20 is not always necessary, and when a wire such as an eyebolt or the like is fixed to a structure such as a construction stand or a fence and not stretched, the first hole 22 is used. You may use the bearing jig 20 without the support.

The second hole 23 is a through hole provided for the operator to grip the pressure bearing jig 20. The second hole 23 is arranged between the notch 21 and the side 20A of the pressure bearing jig 20, and is provided so that the longitudinal direction thereof is the width direction of the notch 21. Further, the width W2 orthogonal to the longitudinal direction of the second hole 23 is wider than the thickness of the hand including the human finger. Therefore, the operator can insert the pressure bearing jig 20 into the second hole and grip the bearing jig 20 with one hand. Further, since the second hole 23 is arranged at a substantially central portion in the lateral direction of the bearing jig 20, the bearing jig 20 is well-balanced and easy to grip when held with one hand. As a result, the burden on the operator is reduced.

<Multi-stage drainage pipe>
Next, the multi-stage drainage pipe 10 according to the embodiment of the present invention will be described with reference to FIGS. 4 to 8.

FIG. 4 is a cross-sectional view schematically showing a cross section of a soil slope on which a multi-stage drainage pipe according to the present embodiment is installed. As shown in FIG. 4, the multi-stage drainage pipe 10 according to the present embodiment is provided in uncovered ground that is not coated with cement in earthwork structures such as embankments and cuts of railways, roads, residential land, etc. It is penetrated. The multi-stage drainage pipe 10 drains groundwater to suppress the rise in the groundwater level during rainfall, and also dissipates excess pore water pressure during an earthquake to lower the water pressure, thereby reducing the rainfall resistance of the slope. It has a function to improve earthquake resistance. Of course, it goes without saying that this multi-stage drainage pipe 10 can be applied not only to artificial slopes such as earthwork structures but also to natural slopes such as hills and steps.

The multi-stage drainage pipe 10 according to the present embodiment is made of a highly corrosion-resistant plated steel plate (for example, NSDH400 K27) having a plate thickness of several mm, and has three pipe bodies having a length of about 2 m and different diameters. I have. As shown in FIG. 5, the multi-stage drainage pipe 10 is composed of a first pipe body 11 as an outer pipe, a second pipe body 12 as a middle pipe, a third pipe body 13 as an inner pipe, and the like. .. The outer diameter of the second pipe body 12 is smaller than the inner diameter of the first pipe body 11, and the outer diameter of the third pipe body 13 is smaller than the inner diameter of the second pipe body 12. Therefore, the second tube body 12 can be accommodated in the first tube body 11, and the third tube body 13 can be accommodated in the second tube body 12. Further, as shown in FIG. 5, each of the first pipe body 11, the second pipe body 12, and the third pipe body 13 is provided with a plurality of drain holes H1 having a diameter of several mm that allow groundwater and excess pore water to permeate. Has been done.

Here, a locking portion 11c is provided at the rear end portion 11b of the first pipe body 11 having a large pipe diameter. The first pipe body 11 having a large pipe diameter is a pipe body that is exposed from the ground when the multi-stage drainage pipe 10 penetrates into the ground. In this embodiment, as shown in FIG. 6, the locking portion 11c is formed by the blocks 15 and 16 (attachments) divided into two blocks that form a cylindrical shape when combined. The block 15 has two extending portions 151 and 152 extending in the direction perpendicular to the axial direction at both ends, and the extending portions 151 and 152 have through holes 151h and 152h penetrating in the thickness direction, respectively. Is formed. Similarly, the block 16 has two extending portions 161, 162 extending in the direction perpendicular to the axial direction at both ends, and penetrates the extending portions 161, 162 in the thickness direction, respectively. Through holes 161h and 162h are formed.

Then, by combining and binding the blocks 15 and 16 to the rear end portion 11b of the first tubular body 11, the locking portion 11c is provided at the rear end portion 11b of the first tubular body 11. Specifically, bolts B and the like are inserted into the through holes 151h and 161h of the extension portions 251 and 161 of the blocks 15 and 16 and the through holes 151h and 162h of the extension portions 152 and 162, respectively, and are fastened with nuts N. By doing so, the blocks 15 and 16 are tied to the rear end portion 11b of the first tubular body 11 to provide the locking portion 11c. The shape of the locking portion 11c is not limited to the shape shown in FIG. 6, and various shapes can be adopted.

FIG. 7 shows a joint shape which is a joint portion between the first pipe body 11 and the second pipe body 12 of the multi-stage drainage pipe 10 according to the present embodiment, showing the first pipe body 11 portion in cross section and the second pipe. It is a partial cut sectional view which shows the body 12 part in the side view. As shown in FIG. 7, the tip portion 11a of the first tubular body 11 is gradually reduced in diameter via the tapered portion, and the rear end portion 12b of the second tubular body 12 is gradually expanded via the tapered portion. The diameter is large, and the tip end 11a of the first tube 11 and the rear end 12b of the second tube 12 are configured to fit and lock each other at the tapered portion when extended.

Similarly, the tip portion 12a of the second tubular body 12 is reduced in diameter, and the rear end portion 13b of the third tubular body 13 is enlarged in diameter, and the tip portion 12a of the second tubular body 12 is expanded. And the rear end portion 13b of the third tubular body 13 are fitted to each other to be fitted to each other. The tip refers to the end of the pipe body in the traveling direction when the multi-stage drainage pipe 10 is pushed into the ground and penetrated, and the rear end refers to the end on the opposite side (the same applies hereinafter). ..

Since the joint portion between the pipe bodies of the multi-stage drainage pipe 10 has such a configuration, it can be extended by using the extrusion jig 1 as described later. Further, as described above, the joint portion between the pipe bodies has a reduced diameter at the tip and an enlarged diameter at the rear end. Therefore, when the multi-stage drainage pipe 10 is extended and penetrated to a predetermined length, the pipe is piped. It is a mechanism that completes the joining of the bodies.

FIG. 8 is a partially enlarged cross-sectional view showing a state in which the tip end portion of the multi-stage drainage pipe 10 is cut along the pipe axis direction. As shown in FIG. 8, a conical tip cap 14 is fitted to the tip 13a of the third pipe body 13 in order to reduce the earth pressure resistance at the time of penetration. The tip cap 14 is made of a resin material such as polypropylene (PP resin).

<Extrusion jig>
Next, the extrusion jig for the multi-stage drainage pipe according to the embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 9, the extrusion jig 1 of the multi-stage drainage pipe according to the present embodiment has a rod 2 made of steel bar having a thread formed on the outer peripheral surface and an extrusion nut screwed into the thread of the rod. Two types of extrusion plates 5 (5') having different sizes that are fixed on the rod 2 with the 3 and the locking nut 4 and these nuts and abut on the pipe end of each pipe body of the multi-stage drain pipe 10 described above. ) (Extruded member), etc.

Further, the extrusion jig 1 is provided with a rod cap 6 which is attached to the rear end of the rod 2 to protect the end portion of the rod 2, and is fitted to the chisel T of the breaker which is a heavy machine from the outside and extruded by the breaker. It also has a chisel cap 7 that facilitates extrusion of the jig 1. The arrow in FIG. 9 indicates the penetration direction of the multi-stage drainage pipe 10, and the reference numeral 11 indicated by the overhead line of the alternate long and short dash line is the first pipe body which is the outermost pipe body of the multi-stage drainage pipe 10 described above. 11 is shown.

(rod)
A thread is formed on the outer surface of the rod 2, and as shown in FIG. 9, it can be easily added by a coupler 8 which is a mechanical joint. Therefore, a short rod 2 of about 1 m can be added at the site to make a long rod. Therefore, it is possible to install the multi-stage drainage pipe 10 even in a narrow construction site where there is no space for pushing a long rod against the ground.

(Extruded nuts and lock nuts)
The extruded nut 3 and the lock nut 4 are nuts having substantially the same shape that are screwed with the threads formed on the outer peripheral surface of the rod 2, and the extruded plate 5 (5') is sandwiched and sandwiched from both sides on the rod 2. It has a function of fixing the extrusion plate 5 (5') to the nut. Further, the extrusion nut 3 also has a function of an extrusion member for extruding the third pipe body 13 described above. The nut may have a polygonal (hexagonal) cross-sectional shape instead of a cylindrical nut, and can be changed as appropriate.

(Extruded plate)
The extrusion plate 5 (5') is a disk-shaped member made of carbon steel for machine structure (S45C), and has a function of contacting the pipe end of the above-mentioned multi-stage drainage pipe 10 and extruding it into the ground. .. There are a plurality of types of extrusion plates 5 (5') having different sizes for each of the pipe diameters 11 to 13 of the multi-stage drainage pipe 10, and the extrusion plate 5 is for extruding the first pipe body 11 and is extruded. The plate 5'is for extruding the second tubular body 12. The extrusion member for extruding the third pipe body 13 is also used as the extrusion nut 3.

(Rod cap)
The rod cap 6 is made of austempered ductile cast iron (ADI treatment: FCAD1200-2), and is a cap-shaped member having an inner peripheral surface that is just fitted onto the rod 2 of D32. As shown in FIG. 9, the rod cap 6 has a mushroom-shaped round and smooth shape at the rear end side. Therefore, the pressing force of the breaker or the hydraulic pile driver can be effectively transmitted to the rod 2.

Further, the shape of the rod cap 6 reduces the possibility that the breaker or the hydraulic pile driver is caught on the sharp end of the rod 2, and prevents the rod 2 from being bent by a heavy machine. Moreover, it is possible to prevent the worker from coming into contact with the sharp end of the rod 2 and being injured.

(Chiser cap)
The chisel cap 7 is a cylindrical member made of carbon steel for machine structure (S45C), and includes a cylindrical chisel cap main body 7A and a diameter-expanded portion 7B whose tip side is expanded in a trumpet shape. I have. Further, the chisel cap main body 7A is formed with a screw fixing portion 7C to which two bolts orthogonal to the axial direction of the chisel cap main body 7A are freely attached and retracted.

Therefore, the chisel cap 7 is attached to the chisel T of the breaker by accommodating the chisel T of the breaker in the chisel cap main body 7A and tightening and crimping with the two bolts of the screwed portion 7C. Then, using the shape of the enlarged diameter portion 7B whose diameter is expanded like a trumpet, the entire rod cap 6 and extrusion jig 1 attached to the rear end of the rod 2 are pushed out by the hydraulic pressure of the breaker, and the multi-stage drainage pipe is used. Penetrate 10 into the ground. According to the chisel cap 7, the hydraulic pressure of the breaker can be efficiently transmitted to the extrusion jig 1, and the extrusion jig 1 can be easily extruded.

<Clogged earth and sand>
Next, the inflow of earth and sand into the multi-stage drainage pipe 10 and its problem will be described with reference to FIGS. 10 and 11. As described above, a plurality of drain holes H1 having a diameter of several mm are bored in the multi-stage drain pipe 10 according to the present embodiment. Therefore, as shown in FIG. 10, earth and sand X flows into the multi-stage drainage pipe 10 from these drainage holes H1. Further, since there are gaps between the inner peripheral surface of the first tubular body 11 and the outer peripheral surface of the second tubular body 12, and the inner peripheral surface of the second tubular body 12 and the outer peripheral surface of the third tubular body 13, respectively. The earth and sand X also flows in from the gap at the tip of the multi-stage drainage pipe 10, and when a concrete breaker or the like is used, the earth and sand X flows into the pipe due to the fluidization of the earth and sand X due to vibration.

When constructing on the ground in a loose state, the earth and sand X that has flowed in between the first pipe body 11 and the second pipe body 12 is increased in diameter as the second pipe body 12 is pushed out. As shown in FIG. 11, the rear end portion 12b of the second tubular body 12 which is integrated in the rear end portion 12b and whose diameter is reduced and the tip portion 11a of the first tubular body 11 is expanded. The earth and sand X is in a compacted state (clogged state) between the two. Therefore, the tip end 11a of the reduced diameter first tube 11 and the rear end 12b of the expanded second tube 12 do not fit, and the position where the first tube 11 should be locked (correct locking position). It will be locked in front of.

In the penetration work of the multi-stage drainage pipe 10, since the pipe body can be pushed in until each pipe body is fitted, the pipe body is pushed in until the pushing amount reaches a predetermined length. However, as described above, the earth and sand X When the length of the multi-stage drainage pipe 10 is shortened when it is locked in front of the position where it should be locked due to the consolidation of the pipe, the multi-stage drainage pipe 10 becomes earth and sand X when the rod is pushed to the predetermined length. The phenomenon of being drawn inside occurs. In this way, if the above phenomenon occurs when the second pipe body 12 is pushed in, the first pipe body 11 is pulled into the earth and sand X, and therefore, in order to perform the subsequent work, it is pulled into the earth and sand X and buried. It is necessary to pull out or dig up the multi-stage drainage pipe 10 in the state from the earth and sand X. In the present embodiment, the problem is solved by using the bearing pressure jig 20 described with reference to FIGS. 1 and 2 for the penetration work of the multi-stage drainage pipe 10.

<How to penetrate a multi-stage drainage pipe>
Next, a method for penetrating the multi-stage drainage pipe according to the embodiment of the present invention will be described with reference to FIGS. 12 to 19. In the following description, a case where the multi-stage drainage pipe 10 is pierced by using a concrete breaker, in which the lead-in Q of the multi-stage drainage pipe 10 is likely to occur, will be described. In FIGS. 15 to 19, the threads of the drain holes H1 and the rods 2 formed in the respective pipe bodies 11 to 13 of the multi-stage drain pipe 10 are not shown.

(1) Positioning step (S101 in FIG. 12)
First, the penetration position of the multi-stage drainage pipe 10 is positioned (not shown). Specifically, the position, penetration angle, etc. of the multi-stage drainage pipe 10 to penetrate into the ground are specified by ground survey, survey, etc., and marked by marking or the like.

(2) Stand installation process (S102 in FIG. 12)
Next, as a preliminary preparation for the work of penetrating the multi-stage drainage pipe 10 into the ground, the gantry is assembled and installed. Specifically, as shown in FIG. 13, a single pipe is assembled in a torii shape using a clamp or the like, and a reserve single pipe is assembled with respect to the ground so as not to fall, and the reserve pipe does not shift. Support with support work. The torii-shaped horizontal pipe of the gantry makes it easy to specify the penetration direction of the multi-stage drainage pipe 10.

(3) Extrusion jig assembly process (S103 in FIG. 12)
Next, as shown in FIG. 14, the above-mentioned extrusion jig 1 is assembled and inserted into the multi-stage drainage pipe 10. Specifically, the extrusion plate 5 for extruding the first tubular body 11 is sandwiched between the extrusion nut 3 and the locking nut 4 and mounted near the center of one rod 2. Then, the rod cap 6 is fitted to the rear end of the rod 2. At this time, as shown in FIG. 15, the chisel cap 7 is also attached to the chisel T of the breaker.

(4) First tube body extrusion step (S104 in FIG. 12)
Next, as shown in FIG. 15, the multi-stage drainage pipe 10 is penetrated into the ground by using the extrusion jig 1 assembled in the previous step. Specifically, the extrusion plate 5 of the extrusion jig 1 extrudes the entire multi-stage drainage pipe 10 together with the first pipe body 11 to penetrate into the ground. Instead of using the extrusion jig 1, the multi-stage drainage pipe 10 may be directly extruded by the chisel cap 7 to penetrate into the ground. In this case, the extrusion jig assembly step, which is the previous step, can be omitted.

(5) Support jig installation process (S105 in FIG. 12)
Next, as shown in FIG. 16, the blocks 15 and 16 described with reference to FIG. 6 are assembled, and the locking portion 11c is attached to the outer peripheral surface of the rear end portion 11b of the first pipe body 11 of the multi-stage drainage pipe 10. Provide. Next, the pressure bearing jig 20 is locked to the locking portion 11c provided at the rear end portion 11b of the first tubular body 11. Specifically, the notch 21 of the pressure bearing jig 20 is inserted into the first pipe body 11 between the locking portion 11c and the ground, and the bearing pressure jig 20 is supported so that the plane surface is parallel to the ground. Install the jig 20.

Further, as shown in FIG. 3, in order to further obtain a resistance force R against the pull-in Q of the multi-stage drainage pipe 10, the pull-in Q of the multi-stage drainage pipe 10 to be penetrated after fixing the eyebolt in the first hole 22. A wire or the like may be stretched between the eyebolt and the gantry in a direction that produces a resistance force R. The pressure bearing jig installation step may be performed after the next extrusion plate replacement step.

(6) Extrusion plate replacement step (S106 in FIG. 12)
Next, as shown in FIG. 17, the extrusion plate, which is an extrusion member, is replaced. Specifically, the pressing by the breaker is interrupted, the extrusion jig 1 is pulled out from the multi-stage drainage pipe 10 to the position of the extrusion plate shown in FIG. 17, and the extrusion plate 5 for extruding the first pipe body 11 is pulled out to the first position. 2 Replace with an extrusion plate 5'for extruding the tube body 12.

(7) Second tube body extrusion step (S107 in FIG. 12)
Next, as shown in FIG. 18, the second pipe body 12 of the multi-stage drainage pipe 10 is penetrated into the ground by using the extrusion jig 1 replaced with the extrusion plate 5'in the previous step. Specifically, the rod 2 is extended by using the coupler 8, and the second pipe body 12 is extruded by the extrusion plate 5'of the extrusion jig 1 replaced in the previous step to obtain the second pipe body 12. The third pipe body 13 inserted into the second pipe body 12 is penetrated deep into the ground.

In this second pipe body extrusion step, as shown in FIG. 16, a locking portion 11c is provided on the outer peripheral surface of the rear end portion 11b of the first pipe body 11 of the multi-stage drainage pipe 10, and after the first pipe body 11 The pressure bearing jig 20 is locked to the locking portion 11c formed on the outer peripheral surface of the end portion 11b. Therefore, even if the earth and sand invade the inside of the pipe and become a consolidated state, the resistance force R against the pull-in Q of the multi-stage drainage pipe 10 into the ground increases due to the reaction force generated between the bearing jig 20 and the ground. Therefore, it is possible to prevent the multi-stage drainage pipe 10 from being pulled into the ground. The earth and sand that has entered the multi-stage drainage pipe 10 is collected from the drainage hole H1 drilled in the first pipe body 11 and the gap at the tip of the pipe body (the tip portions of the first pipe body 11 and the second pipe body 12). (The gap at the tip of the second pipe body 12 and the third pipe body 13) is discharged.

(8) Extrusion plate removing step (S108 in FIG. 12)
Next, an extrusion plate removing step of removing the extrusion plate, which is an extrusion member, is performed. Specifically, the extrusion jig 1 is pulled out from the multi-stage drainage pipe 10 to the position of the extrusion plate 5', the lock nut 4 is loosened, and the extrusion plate 5'is pulled out in a direction substantially orthogonal to the axis of the rod 2. Remove.

Since the extrusion nut 3 of the extrusion jig 1 also serves as an extrusion member for extruding the third pipe body 13, it is possible to save the trouble of mounting the final extrusion member, and it is possible to replace the extrusion jig. Time can be shortened. In addition, the types of extrusion members can be reduced, and the manufacturing cost of the extrusion jig 1 can also be reduced.

(9) Third tube body extrusion step (S109 in FIG. 12)
Next, as shown in FIG. 19, a third pipe body extrusion step is performed in which the multi-stage drainage pipe 10 is penetrated into the ground by using the extrusion jig 1 from which the extrusion plate 5'has been removed in the previous step. Specifically, the rod 2 is extended by using the coupler 8, the extrusion plate 5'is removed in the previous step, and the lock nut 4 is tightened and fixed until it comes into contact with the extrusion nut 3. After that, the third pipe body 13 is pushed out by the extrusion nut 3 of the extrusion jig 1 to penetrate the third pipe body 13 into the ground to a predetermined depth.

When this step is completed, the installation work of the multi-stage drainage pipe 10 is completed by removing the installed pedestal, the pressure bearing jig 20, the locking portion 11c provided on the first pipe body 11, and cleaning up. To do.

In the above description, a case where a concrete breaker is attached to the tip of the hydraulic excavator and the multi-stage drainage pipe 10 is penetrated into the ground has been described as an example, but it can be held in a narrow site where heavy machinery cannot be carried in. The extrusion jig 1 may be pressed by a pile driver or the like to allow the multi-stage drainage pipe 10 to penetrate into the ground.

<Action and effect of the pressure bearing jig and the penetration method of the multi-stage drainage pipe according to the embodiment>
As described above, the pressure bearing jig 20 for the multi-stage drainage pipe according to the present embodiment is a pipe body exposed from the ground among a plurality of pipe bodies 11 to 23 having different pipe diameters included in the multi-stage drainage pipe. The lead-in of the pipe that is locked to the locking portion 11c provided at the rear end portion 11b of the first pipe body 11 having a large pipe diameter, comes into contact with the ground, and occurs in the direction in which the multi-stage drainage pipe 10 penetrates into the ground. The reaction force generated between the force and the ground suppresses the pulling Q of the multi-stage drainage pipe 10 into the earth and sand. Therefore, when the multi-stage drainage pipe 10 is penetrated into the ground, the pressure bearing jig 20 is attached to the locking portion 11c provided at the rear end of the first pipe body 11 which is a pipe body exposed from the ground. By locking, the resistance R against the pull-in Q into the ground when the multi-stage drainage pipe 10 penetrates into the ground increases, and the pull-in Q into the ground of the multi-stage drainage pipe 10 can be prevented. it can. Therefore, even if the ground is in a so-called "loose" state, it is possible to prevent the multi-stage pipe from being pulled into the ground.

Further, since the pressure bearing jig 20 includes a notch portion 21 having a width narrower than the width W3 of the locking portion 11c, the first pipe body 11 which is a pipe body in which the pressure bearing jig 20 is exposed from the ground. By installing the multi-stage drainage pipe 10 between the locking portion 11c provided at the rear end portion 11b and the ground, the multi-stage drainage pipe 10 is securely locked to the bearing jig 20 and into the ground of the multi-stage drainage pipe 10. The pull-in Q can be effectively prevented.

Further, by using the notch 21, the bearing jig 20 can be installed at an angle with respect to the axial direction of the multi-stage drainage pipe 10. Therefore, the bearing jig 20 can be installed with the plane of the bearing jig 20 parallel to the ground regardless of the inclination angle of the ground. As a result, the contact area between the bearing jig 20 and the ground increases, the resistance force R of the multi-stage drainage pipe 10 to the pull-in Q into the ground increases, and the pull-in Q of the multi-stage drainage pipe 10 into the ground increases. It can be prevented more effectively. Further, since the multi-stage drainage pipe 10 is regulated in the left-right direction, it is possible to prevent lateral movement when the multi-stage drainage pipe 10 penetrates.

Further, the locking portion 11c of the multi-stage drainage pipe 10 according to the present embodiment is different from the first pipe body 11 at the rear end portion 11b of the first pipe body 11 having a large pipe diameter, which is a pipe body exposed from the ground. It is configured by providing blocks 15 and 16 which are members. Therefore, it can be applied to the existing multi-stage drainage pipe 10.

Further, in the pressure bearing jig 20 according to the present embodiment, since the pressure bearing jig 20 is detachably locked to the multi-stage drainage pipe 10 by the locking portion 11c, when the multi-stage drainage pipe 10 is pierced. Only the bearing jig 20 is attached, and the bearing jig 20 can be easily removed when the intrusion work of the multi-stage drainage pipe 10 is completed. Therefore, since the pressure bearing jig 20 can be reused, the intrusion work of the multi-stage drainage pipe 10 can be continuously performed, the construction period required for the intrusion work of the multi-stage drainage pipe 10 can be shortened, or the multi-stage type can be used. It is possible to keep the cost of penetrating the drainage pipe 10 and manufacturing the pressure bearing jig 20 low.

Further, a plurality of drainage holes H1 are formed in each of the first pipe bodies 11 to 3 pipe bodies 13 included in the multi-stage drainage pipe 10 according to the present embodiment. In this case, earth and sand easily flow into the pipe through the drainage hole H1, but by installing the bearing jig 20, the resistance force R of the multi-stage drainage pipe 10 to the pull-in Q into the ground increases, and the multi-stage drainage pipe 10 increases. It is possible to prevent the pull-in Q of the type drainage pipe 10 into the ground. That is, the pressure bearing jig 20 according to the present embodiment can be suitably used for the multi-stage drainage pipe 10 in which such a drainage hole H1 is formed.

Further, the bearing jig 20 of the multi-stage drainage pipe 10 according to the present embodiment has a gripping mechanism for obtaining a resistance force R against pulling Q of the multi-stage drainage pipe 10 into the ground. In this case, the resistance force R by the bearing jig 20 can be increased by stretching a wire or the like on the gripping mechanism and pulling the multi-stage drainage pipe 10 in the direction opposite to the penetration direction. Therefore, even in the construction in a looser state of the ground, it is possible to prevent the multi-stage drainage pipe 10 from being pulled into the ground.

Further, the gripping mechanism of the pressure bearing jig 20 of the multi-stage drainage pipe 10 according to the present embodiment has a first hole 22 which is a through hole. Therefore, the eyebolt can be passed through the first hole 22 and screwed with a nut (not shown) on the back surface of the pressure bearing jig 20 to fix the eyebolt, and a wire or the like can be stretched on the eyebolt. Further, when the eyebolt is removed, the bearing jig 20 can be accommodated without taking up space because there is no protruding portion.

Further, the method for penetrating the multi-stage drainage pipe 10 according to the present embodiment is a method for penetrating the multi-stage drainage pipe 10 having a plurality of pipe bodies having different pipe diameters into the ground. Then, the multi-stage drainage pipe 10 is formed by the step of penetrating the first pipe body 11 (the pipe body of 1) having a large pipe diameter into the ground so that a part of the pipe body is exposed from the ground and the reaction force generated between the pipe body 11 and the ground. The bearing jig 20 according to the present embodiment, which suppresses the pulling of the pipe into the ground, is locked to the locking portion 11c provided at the rear end portion 11b of the first pipe body 11 which has penetrated into the ground. A step of bringing the bearing jig 20 into contact with the ground, and a step of penetrating the second pipe body 12 and the third pipe body 13, which are other pipe bodies other than the first pipe body 11 penetrating into the ground, into the ground. Have.

Further, when the multi-stage drainage pipe 10 is penetrated into the ground, another pipe body (second pipe body 12, third pipe body 13) is contained in the first pipe body 11 having a large pipe diameter among the plurality of pipe bodies. ) Is inserted, a part of the first pipe body 11 having a large pipe diameter is exposed from the ground and penetrates into the ground, and the bearing jig 20 is inserted into the rear end portion 11b of the first pipe body 11 having a large pipe diameter. The other second pipe body 12 and the third pipe body 13 which are inserted into the first pipe body 11 having a large pipe diameter exposed from the ground by being locked to the locking portion 11c provided on the ground and in contact with the ground. Intrudes into the ground.

Therefore, the resistance force R against the pull-in Q into the ground when the multi-stage drainage pipe 10 penetrates into the ground increases, and the pull-in Q into the ground of the multi-stage drainage pipe 10 can be prevented. Even when penetrating into the ground in a so-called "loose" state, it is possible to prevent the multi-stage drainage pipe 10 from being pulled into the ground.

<Other Embodiments>
Although the present invention has been described in detail with reference to specific examples, the present invention is not limited to the above contents, and any modification or modification is possible as long as it does not deviate from the scope of the present invention.

For example, as in the bearing jig 40 shown in FIG. 20A, a tubular pipe joint 41 is provided in place of the notch 21 of the bearing jig 20 described with reference to FIGS. 1 and 2. It may be configured as such. The pipe joint 41 has an insertion hole 42 for inserting the multi-stage drainage pipe and a fixing bolt 43 (11c) for fixing the multi-stage drainage pipe to the bearing jig 40. Since the other configurations of the bearing jig 40 shown in FIG. 20A are the same as those of the bearing jig 20 described with reference to FIGS. 1 and 2, they are duplicated with the same reference numerals. The explanation to be performed is omitted.

In the case of the pressure bearing jig 40, the multi-stage drainage pipe is formed by inserting the multi-stage drainage pipe into the insertion hole 42 of the pipe joint 41 of the pressure bearing jig 40 and then locking the multi-stage drainage pipe with the fixing bolt 43 (11c). It is fixed to the pressure bearing jig 40. As a result, the reaction force generated between the bearing jig 40 and the ground suppresses the pulling Q of the multi-stage drainage pipe into the earth and sand, and even if the ground is in a so-called "loose" state, the multi-stage pipe is inside the ground. It is possible to prevent the pull-in Q to. Further, since the multi-stage drainage pipe is inserted into the insertion hole 42, the movement of the multi-stage drainage pipe is restricted not only in the left-right direction but also in the vertical direction, so that the multi-stage drainage pipe is lateral when penetrating. It is possible to prevent blurring.

A locking portion 11c is attached to the rear end portion 11b of the first pipe body of the multi-stage drainage pipe by blocks 15 and 16 (attachments) divided into two, which form a cylindrical shape when combined, as shown in FIG. When provided, if the width W3 of the locking portion 11c is configured to be larger than the inner diameter of the insertion hole 42 of the pipe joint 41, locking by the fixing bolt 43 (11c) becomes unnecessary.

Further, as in the above embodiment, as shown in FIG. 20B, the bearing jig 40 has a bolt (eye bolt) 31 in the first hole 22 provided at the edge portion of the bearing jig 40. The wire 32 or the like may be stretched in the direction in which the resistance R is generated against the pull-in Q of the multi-stage drainage pipe to be penetrated (the direction of the arrow). The direction of the arrow shown in FIG. 20B is an example, and may be any other direction as long as the resistance R is generated against the lead-in Q of the multi-stage drainage pipe.

Further, the notch 21 of the pressure bearing jig 20 may be a through hole penetrating in the plate thickness direction. In this case, it should be noted that the inner diameter of the through hole is made smaller than the width W3 of the locking portion 11c provided at the rear end portion 11b of the first tubular body 11. Further, the through hole preferably has an elongated hole shape in a plan view. By making the through hole a long hole shape in a plan view, the bearing jig 20 can be installed at an angle with respect to the axial direction of the multi-stage drainage pipe 10, and the bearing can be cured regardless of the inclination angle of the ground. The bearing jig 20 can be installed with the plane of the tool 20 parallel to the ground.

Further, the locking portion 11c of the multi-stage drainage pipe 10 may be integrally formed with the rear end portion 11b of the first pipe body 11. In this case, since the locking portion 11c is integrally molded with the rear end portion 11b of the first tubular body 11, it is necessary to install the locking portion 11c at the rear end portion 11b of the first tubular body 11 at the site or in advance. Instead, the mounting step of the locking portion 11c can be omitted.

Further, a rod-shaped member may be inserted into the drain hole H1 of the rear end portion 11b of the first pipe body 11 to replace the locking portion 11c. When the drain hole H1 has a slit shape, a plate-shaped member may be inserted into the drain hole H1 instead of a rod-shaped member. Further, a through hole through which the rod-shaped member or the plate-shaped member is inserted may be newly provided in the rear end portion 11b of the first tubular body 11.

In the above embodiment, as the multi-stage pipe, the embodiment is described by taking as an example a multi-stage drainage pipe in which drain holes are bored in each pipe body constituting the multi-stage pipe, but the application of the present invention is multi-stage. It is not limited to the type drainage pipe, and can be applied to, for example, a multi-stage pile.

1: Extrusion jig 2: Rod 3: Extrusion nut (nut)
4: Loosening prevention nut (nut)
5, 5': Extruded plate (extruded member)
50, 50': Plate body 51, 51': Detachable groove (groove)
52, 52', 53, 53': Counterbore part 6: Rod cap 7: Chisel cap 7A: Chisel cap body 7B: Diameter expansion part 7C: Screwing part 8: Coupler 10: Multi-stage drainage pipe 11: First pipe Body 12: Second pipe body 13: Third pipe body 11a, 12a, 13a: Tip portion 11b, 12b, 13b: Rear end portion 11c: Locking portion 14: Tip cap 15, 16: Block 151,161,152, 162: Extensions 151h, 161h, 152h, 162h: Through holes 20: Supporting jigs 20A, 20B, 20C, 20D: Supporting jig sides 21: Notch 22: First hole 23: Second hole 31: Eye bolt 32: Wire 40: Pressure jig 41: Pipe joint 42: Insertion hole 43: Fixing bolt B: Bolt H1: Drain hole N: Nut Q: Arrow R indicating the pull-in direction of the multi-stage pipe: Direction of resistance Arrow T: Chisel W1: Width of notch W2: Width of second hole W3: Width of locking part X: Sediment

Claims (11)

It is a pressure bearing jig for multi-stage pipes that has multiple pipe bodies with different pipe diameters and penetrates into the ground.
The pressure bearing jig is locked to a locking portion provided at the rear end of the pipe body exposed from the ground among the plurality of pipe bodies, and abuts on the ground.
With respect to the pulling force of the pipe generated in the direction in which the multi-stage pipe penetrates into the ground, the reaction force generated between the multi-stage pipe and the ground causes a resistance force to repel the pulling force .
The pressure bearing jig includes a notch having a width narrower than the width of the locking portion.
The cutout, Bearing jig multistage pipe, characterized in Rukoto through communication with the multi-stage pipe. It is a pressure bearing jig for multi-stage pipes that has multiple pipe bodies with different pipe diameters and penetrates into the ground.
The pressure bearing jig is locked to a locking portion provided at the rear end of the pipe body exposed from the ground among the plurality of pipe bodies, and abuts on the ground.
With respect to the pulling force of the pipe generated in the direction in which the multi-stage pipe penetrates into the ground, the reaction force generated between the multi-stage pipe and the ground causes a resistance force to repel the pulling force .
The bearing capacity jig Bearing jig multistage pipe, characterized in Rukoto which have a gripping mechanism for obtaining said resistance. The pressure bearing jig has a through hole having a diameter smaller than the outer diameter of the locking portion.
The bearing jig for a multi-stage pipe according to claim 1 or 2 , wherein the through hole communicates with the multi-stage pipe. The bearing jig for a multi-stage pipe according to claim 3, wherein the through hole has an elongated hole shape in a plan view. The pressure bearing jig includes a notch having a width narrower than the width of the locking portion.
The bearing jig for a multi-stage pipe according to claim 2 , wherein the notch portion communicates with the multi-stage pipe. The multi-stage pipe according to any one of claims 1 to 5 , wherein the locking portion is provided with a member separate from the pipe body at a rear end portion of the pipe body exposed from the ground. Supporting jig. The bearing control of the multi-stage pipe according to claim 6 , wherein the pressure bearing jig is detachably locked by the locking portion in the axial direction or the axially perpendicular direction of the multi-stage pipe. Ingredients. The bearing jig for a multi-stage pipe according to any one of claims 1 to 5 , wherein the locking portion is integrally molded with a rear end portion of a pipe body exposed from the ground. The bearing jig for a multi-stage pipe according to any one of claims 1 to 8 , wherein a plurality of drain holes are formed in each of the plurality of pipe bodies. The bearing jig for a multi-stage pipe according to claim 1, wherein the bearing jig has a gripping mechanism for obtaining the resistance force. The bearing jig for a multi-stage pipe according to claim 2 or 10 , wherein the gripping mechanism has a through hole on the inner peripheral surface.