JP2014031668A - Method for burying plastic cylindrical body underground - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for burying a plastic pipe 1 underground that can dig a hole without using a head member which remains in the ground so as to bury only the plastic pipe 1 underground.SOLUTION: A hard peg 3 which has a peg body 4 longer than the entire length of a plastic pipe 1 and which has a pointed head 5 at the tip position of the peg body 4 and a flange 6 with a diameter larger than that of the pipe 1 at the base end position is inserted in the plastic pipe 1 from the tip side of the pointed head 5, and the peg 3 is raised in the ground with the pointed head 5's tip as the lower end. The peg 3 is buried underground by applying load to the flange 6 from above, and the pipe 1 is pressed from the upper end side by the flange 6 moving down as the peg 3 moves down and the pipe 1 is buried underground guided by the peg 3, and only the peg 3 is removed after burying the pipe 1.

Description

  The present invention relates to an embedding method for embedding in a ground by pressing a plastic cylindrical body.

  For example, as a ground improvement work when the land is soft, a construction work in which a pipe is driven and buried in the ground is performed. Similarly, pipes may be driven to drain groundwater. In addition to these, construction for driving a pipe into the ground for various uses is common. An example of an embedding method for embedding such a pipe in the ground is given as Patent Documents 1 and 2. In each of Patent Documents 1 to 3, a head member for excavation is attached to the tip of a pipe to be embedded, a rod is inserted from above the pipe, and a load (for example, an air hammer or The excavator is struck by excavating a hydraulic excavator.

JP-A-8-209697 Japanese Utility Model Publication No. 3-69037 Registered Utility Model No. 3107557

However, in each of the above-mentioned patent documents, the head member must be left in the ground after the pipe is buried, and driving a large number of pipes requires the number of head members to be prepared, resulting in an increase in cost. To do. To avoid the use of a head member, for example, the upper end of the pipe may be struck or pushed into the ground, but if it is a metal pipe, noise and vibration can be ignored. Although it is possible, it is generally impossible to select such a construction method for plastic pipes because there is a high possibility of cracking when a load is applied to the upper end of the pipe. Therefore, there has been a demand for a method that allows construction without using the above-described head member when embedding a plastic cylindrical body in the ground.
The present invention has been made in order to solve the above-described problems, and the purpose thereof is to drill a hole without using a head member for excavation that remains in the ground, and to make only a plastic cylindrical body underground. An object of the present invention is to provide a method for underground embedding of a plastic cylindrical body that can be embedded in a wall.

In order to achieve the above object, according to the first aspect of the present invention, the plastic cylindrical body has a main body portion that is longer than the entire length of the cylindrical body, and has a sharp point at the tip position of the main body portion. A hard pointed columnar member having a head and having a projecting portion extending at least in the region of the wall thickness of the cylindrical body at the base end position is inserted from the pointed end side, and the pointed tip is The pointed columnar member is erected on the ground as the lower end, and the pointed columnar member is embedded in the ground by applying a load from above to the overhanging portion, and with the downward movement of the pointed columnar member The tubular body is pressed from the upper end side by the projecting portion that moves downward and embedded in the ground using the pointed columnar member as a guide, and only the pointed columnar member is embedded after the tubular body is embedded. The gist is that it was taken out
In addition, in the invention according to claim 2, in addition to the configuration of the invention according to claim 1, the cross-sectional shape of the outer peripheral surface of the main body portion of the pointed columnar member is the inner peripheral surface of the cylindrical body to be inserted. Its gist is that the cross-sectional shape is similar to that of the above.
Further, in the invention according to claim 3, in addition to the configuration of the invention according to claim 1 or 2, the outer peripheral surface of the main body portion of the pointed columnar member and the inner peripheral surface of the cylindrical body are close to each other. Is the gist.

In addition, in the invention according to claim 4, in addition to the configuration of the invention according to any one of claims 1 to 3, a guide hole is formed in advance at a position where the cylindrical body is embedded by the pointed columnar member. This is the gist.
Moreover, in addition to the structure of the invention in any one of Claims 1-4 in the invention of Claim 5, in the case where it hits a layer harder than the ground surface side in the middle of embedding the cylindrical body The gist is that the columnar member is taken out with the layer as the lowermost layer, and the cylindrical body remaining on the ground is cut.
Further, in the invention according to claim 6, in addition to the configuration of the invention according to any one of claims 1 to 5, the lower end surface of the cylindrical body is inclined with respect to the axial direction so that the tip thereof has a narrow angle. The gist is that it is formed at an angle in the direction.
Moreover, in invention of Claim 7, in addition to the structure of the invention in any one of Claims 1-6, the cross-sectional shape of the thickness direction of the lower end surface of the said cylindrical body is formed in the pointed cone shape. Is the gist.
The gist of the invention according to claim 8 is that, in addition to the configuration of the invention according to any one of claims 1 to 7, the cylindrical body has a circular cross section.
Further, in the invention according to claim 9, in addition to the configuration of the invention according to any one of claims 1 to 8, the outer peripheral position of the projecting portion of the pointed columnar member is extended toward the distal direction. The gist is that two overhangs are formed.
Moreover, in addition to the structure of the invention in any one of Claims 1-9, in the invention of Claim 10, a buffer member is arrange | positioned between the said overhang | projection part of the said cylindrical body and the said peak pillar-shaped member. The gist is to be done.

By adopting the configuration as described above, when the plastic cylindrical body is embedded in the ground, a load is applied from above to the protruding portion of the pointed columnar member, so that the cylindrical body is below the protruding portion. It will be pressed from the upper end side by movement. Then, if the pointed columnar member is taken out as it is at the stage where the cylindrical body is embedded, only the cylindrical body remains in the ground. As a result, a member necessary for excavation such as a head member becomes unnecessary, and the plastic cylindrical body is pressed from its upper end, but is embedded while being guided by the main body portion of the pointed columnar member. If the yield strength of the compressive stress in the axial direction is sufficiently large, the cylindrical body advances into the hole excavated by the tip of the pointed columnar member by the pressing force if it is difficult to bend and bending stress is generated. And if a pointed columnar member is taken out in a state where the cylindrical body is embedded, only the cylindrical body will be embedded in the ground.
As a result, it is possible to dig a hole without using a head member for excavation that remains in the ground and embed a plastic cylindrical body, and to leave only the plastic cylindrical body in the ground and The head columnar member can be collected.

Here, “loading the top columnar member in the ground by applying a load from above” gives a force to advance downward by hitting the columnar member from above or pressing it with a heavy object. That is. The pointed columnar member itself may be rotated to use the tip of the pointed head like a drill.
The length, diameter, cross-sectional direction thickness (wall thickness), etc. of the pipe can be appropriately changed according to the application. Further, the wall thickness is appropriately changed depending on the length and diameter. Further, the material is not particularly limited, and it is preferable to use an inexpensive recycled material.
As the material of the hard pointed columnar member, an alloy, a plastic, a glass fiber, a wooden, or the like is assumed. This is because plastic is also included as a material, but even if it is made of plastic, it can be used as the pointed columnar member of the present invention as long as sufficient rigidity can be obtained by making it solid.

The cross-sectional shape of the outer peripheral surface of the main body portion of the pointed columnar member is preferably similar to the cross-sectional shape of the inner peripheral surface of the cylindrical body to be inserted. This is because if the shape is not similar, useless gaps are generated between the two, and bending stress is easily generated when the cylindrical body is pressed from the upper end side. Moreover, it is preferable that the outer peripheral surface of the main body portion of the pointed columnar member and the inner peripheral surface of the cylindrical body are close to each other. This is because, if they are close to each other, the cylindrical body is difficult to bend when pressed from the upper end side. However, if they are close enough to be in close contact with each other, there is a possibility that the pointed columnar member cannot be taken out after the tubular body is buried due to expansion due to a change in the surrounding atmosphere or slight deflection. In the case of proximity, a slight gap (about 2 to 10 mm) is formed in the inserted state.
Prior to embedding the cylindrical body, it is preferable that the guide hole is formed in advance by a pointed columnar member at a position where the cylindrical body is embedded. As a result, the cylindrical body is more difficult to break and can be quickly buried in the ground. It is most preferable that the pointed columnar member is the same type of pointed columnar member as that used when embedding the cylindrical body, but it does not necessarily have to be the same type of pointed columnar member.
In addition, when a cylindrical body hits a layer that is harder than the ground surface, the pointed columnar member is taken out using that layer as the base layer, and the cylindrical body remaining on the ground is cut. (The position at which the cut is made is arbitrary).

There is a preferred form when the cylindrical body is pressed from its upper end side and embedded in the ground. That is, it is to make the tip (lower end) of the cylindrical body easy to bite into the ground.
For this purpose, it is conceivable to form the lower end surface of the cylindrical body at an oblique angle with respect to the axial direction so that the tip has a narrow angle. That is, it is formed so that the tip end of the cylindrical body is cut obliquely.
Moreover, it is possible to form the cross-sectional shape of the thickness direction of the lower end surface of a cylindrical body in the shape of a cone. For example, the cross-sectional shape in the thickness direction of the lower end surface is formed so as to be tapered from the outside to the inside or vice versa. It does not matter if the cross-sectional shape is not a uniform taper shape but a pointed cone shape.

The cylindrical body preferably has a circular cross section. This is because the cross-sectional circular shape has the best stress balance, and it is easy to manufacture a pointed columnar member. However, it is free to adopt a shape other than the circular cross section.
In addition, a second projecting portion extending toward the distal end is formed at the outer peripheral position of the projecting portion of the pointed columnar member to protect the vicinity of the upper end from an impact or the like when pressing the cylindrical body. It is preferable to do.
Similarly, it is preferable to dispose a buffer member between the protruding portion of the cylindrical body and the pointed columnar member from the viewpoint of mitigating impact.

  According to the invention described in each of the above claims, a plastic cylindrical body can be embedded by excavating a hole without using a head member for excavation that remains in the ground. It becomes possible to collect the pointed columnar member while leaving only the body in the ground.

(A) of a pipe used for an embodiment of the invention is a partially omitted perspective view, and (b) is a partially omitted vertical sectional view. (A) of a peg used for the same embodiment is a partially omitted perspective view, and (b) is a partially omitted vertical sectional view. The partially-omission front view of the state which inserted the peg in the said pipe. (A) is explanatory drawing of the state which has formed the guide hole by the peg, (b) is explanatory drawing of the state made to stand with respect to the ground, (c) has buried the pipe and the peg in the ground. Explanatory drawing explaining a state, (d) is explanatory drawing of the state which pulled up the peg in the embedment completion state of a pipe. The end view explaining an example of the pipe used in other embodiments. It is the shape of the lower end part of the pipe used by other embodiment, (a) is a perspective view, (b) is a front view. The partially abbreviate | omitted front view of the state which inserted the peg in the pipe through packing in other embodiment. (A) of the state which inserted the peg in the pipe in other embodiment is a partial expansion front view, (b) is a partial expansion longitudinal cross-sectional view.

Hereinafter, an example in which the present invention is applied to ground improvement work will be described with reference to the drawings as a specific embodiment of the underground method for embedding a plastic cylindrical body of the present invention.
1A and 1B show a pipe 1 as a cylindrical body used in the method of the present invention. The pipe 1 is made of a cylindrical vinyl chloride formed with the same inner diameter and outer diameter over the entire length. In this embodiment, the total length is 3000 mm, the thickness is 7 mm, and the outer diameter is 200 mm. As shown in FIG. 1 (b), the tip (lower end) of the pipe 1 is formed in a tapered shape with a tapered shape so that the thickness direction gradually decreases from the outside toward the inside, and a sharp inclined surface 2 is formed. Has been.
2 (a) and 2 (b) show a peg 3 as a pointed columnar member used in the method of the present invention. The peg 3 includes a peg main body 4 made of a hollow pipe material made of an aluminum alloy and having a circular cross section, a pointed head 5 welded to the tip of the peg main body 4, and a disk-shaped flange 6 welded to the base end of the peg main body. It consists of and. The peg body 4 has a length of 3010 mm and an outer diameter of 180 mm. The pointed head 5 has a total length of 150 mm and is formed in a conical shape. The flange 6 has a diameter of 240 mm and a thickness of 15 mm.
When the peg 3 is inserted into such a pipe 1, the distance in the cross-sectional direction between the pipe 1 and the peg body 4 in the inserted state is 3 mm on average. Further, as shown in FIG. 3, the peg body advances slightly downward from the lower end of the pipe 1 with the pipe 1 being in the uppermost position, that is, in contact with the back surface of the flange 6, and the pointed head is at the extended position. 5 will be arranged. Since the flange 6 is larger than the diameter of the pipe 1, the upper end of the pipe 1 is hidden in a plan view and only the flange 6 is visible.

Next, a method for burying the pipe 1 in the ground improvement work using the pipe 1 and the peg 3 will be described.
First, as shown in FIG. 4 (a), the peg 3 is erected and held so that the tip of the pointed head 5 is stuck in the ground surface at a position where the pipe 1 is embedded, and a load is intermittently applied from above. Make a call. This is performed, for example, by hitting with an air hammer or a shovel such as a hydraulic excavator. By this operation, a guide hole H for embedding the pipe 1 is formed.
Next, as shown in FIG. 4B, the peg 3 in a state where the pipe 1 of FIG. 3 is inserted is raised and held so that the tip of the pointed head 5 is stuck in the guide hole H. And a load is applied intermittently from above. Similarly to the above, this is performed by hitting with an air hammer or a shovel of a hydraulic excavator.
When the load is applied in this manner, the peg 3 is gradually buried in the ground, and the pipe 1 is also pressed from the upper end side by the flange 6 and moves downward as the peg 3 moves downward. In the present embodiment, as shown in FIG. 4C, the load is continuously applied until the flange 6 of the peg 3 reaches the ground surface. And as shown in FIG.4 (d), the embedding of the pipe 1 is completed by raising only the peg 3 upwards. Thereafter, a lid (not shown) is attached to the pipe 1 as necessary, and one burial operation of the pipe 1 is completed. Thereafter, the pipe 1 is embedded at a predetermined interval by the same operation.

With the configuration described above, the following effects are achieved in the present embodiment.
(1) The pipe 1 can be buried by excavating a hole without using a head member for excavation that remains in the ground, and the peg 3 can be recovered while leaving only the pipe 1 in the ground. it can.
(2) Since the pipe 1 is guided by the peg body 4 when descending, it is difficult to bend, and even if it is pressed by the flange 6 from above, it is not easily broken.
(3) First, the guide hole H is formed with the peg 3, and then the pipe 1 is embedded while being guided to the guide hole H using the same peg 3, so The resistance is relatively small and damage to the pipe 1 is small.
(4) A slanted surface 2 is formed at the tip of the pipe 1 so as to easily bite into the ground. In addition, since the inclined surface 2 is formed in a taper shape so that the thickness direction gradually decreases from the outside toward the inside, the soil is pushed outward as the pipe 1 moves downward. This contributes to ease of biting in the pipe 1.

The present invention may be embodied as follows.
The shape of the pipe 1 can be changed to various cross-sectional shapes as shown in FIG. 5 in addition to the above. In addition, since the above is the pipe 1 for ground improvement construction, although it was comparatively long and was large diameter, the size can be changed suitably according to a use. Moreover, the clearance gap between the peg main bodies 4 can also be changed suitably.
-Although the peg 3 was made to weld the peg main body 4 and the pointed head 5 in the above, it is free to implement in another form. For example, the whole body may be integrally formed, or two members may be connected by a coupling mechanism.
-Materials other than those described above may be used for the pipe 1 and the peg 3.
-In addition to the above embodiment, the shape of the tip of the pipe 1 is cut at an oblique angle with respect to the axial direction so that the tip of the lower end surface is narrow as shown in FIGS. 6 (a) and 6 (b). The surface 9 may be formed. Moreover, it does not necessarily need to be a shape that easily penetrates into the ground as described above. For example, if the thickness of the pipe 1 is thin or the ground is not hard, there is little need for such processing.
As shown in FIG. 7, the packing 10 may be disposed between the flange 6 and the pipe 1 with the peg 3 inserted through the pipe 1. If comprised in this way, the impact to the pipe 1 will be relieved.
As shown in FIGS. 8 (a) and 8 (b), the entire peripheral edge (or part) of the flange 6 is bent at the tip side to form the hanging wall portion 11, and the peg body 4, the flange 6, and the hanging wall portion. 11 may surround the upper portion of the pipe 1 in the space formed by the head 11. This protects the pipe 1 from impacts over a wider area. Of course, it may be combined with the packing 10.
• Pipe 1 does not have to be completely buried. For example, if the tip touches a very hard base, further entry may cause the pipe 1 to break, so do not force it, take out the peg 3 there and remove the unnecessary part left on the ground You may cut it.
-The guide hole H may not be present.
In addition, the present invention may be implemented in a modified form without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Pipe as a plastic cylindrical body, 3 ... Peg as a pointed columnar member, 4 ... Peg main body as a main-body part, 5 ... Pointed head, 6 ... Flange as an overhang | projection part.

Claims (10)

  The plastic cylindrical body has a main body part longer than the entire length of the cylindrical body, has a pointed head at the distal end position of the main body part, and at least the thickness of the cylindrical body at the proximal end position A hard pointed columnar member having a protruding portion extending over a width or more is inserted from the tip end side of the pointed head, and the pointed columnar member is erected on the ground with the tip of the pointed head as a lower end, and the protruding portion is On the other hand, the columnar member is embedded in the ground by applying a load from above, and the tubular body is moved from its upper end side by the overhanging portion that moves downward with the downward movement of the peaked columnar member. The plastic cylindrical body is characterized by being pressed and embedded in the ground as the pointed columnar member as a guide, and only the pointed columnar member is taken out after the cylindrical body is embedded. Burial method.   The cross-sectional shape of the outer peripheral surface of the main body portion of the pointed columnar member is similar to the cross-sectional shape of the inner peripheral surface of the cylindrical body to be inserted. Underground plastic cylinders.   The method of embedding a plastic cylindrical body according to claim 1 or 2, wherein the outer peripheral surface of the main body portion of the pointed columnar member and the inner peripheral surface of the cylindrical body are close to each other.   The method of embedding a plastic cylindrical body according to any one of claims 1 to 3, wherein a guide hole is formed in advance at a position where the cylindrical body is embedded by the pointed columnar member.   When it hits a layer that is harder than the ground surface in the middle of burying the cylindrical body, the pointed columnar member is taken out with the layer as the lowest layer, and the cylindrical body remaining on the ground is cut. The method according to claim 1, wherein the plastic tubular body is buried in the ground.   The plastic cylinder according to any one of claims 1 to 5, wherein a lower end surface of the cylindrical body is formed at an oblique angle with respect to the axial direction so that a tip thereof has a narrow angle. The method of burying the underground.   The method of embedding a plastic cylindrical body according to any one of claims 1 to 6, wherein a cross-sectional shape in a thickness direction of the lower end surface of the cylindrical body is formed in a conical shape.   The said cylindrical body is a cross-sectional circular shape, The underground embedment method of the plastic cylindrical body in any one of Claims 1-7 characterized by the above-mentioned.   9. The plastic-made product according to claim 1, wherein a second projecting portion extending toward a distal end is formed at an outer peripheral position of the projecting portion of the pointed columnar member. A method of burying tubular bodies underground.   10. A plastic cylindrical body according to any one of claims 1 to 9, wherein a buffer member is disposed between the tubular body and the protruding portion of the pointed columnar member. Method.

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