JP5463587B2 - Sediment fall prevention device for construction of hydraulic solidification liquid replacement pile and construction method of hydraulic solidification liquid replacement pile - Google Patents

Description

  The present invention relates to a method for constructing a sediment-preventing device for building a small-diameter hydraulic solidification liquid replacement pile and a hydraulic solidification liquid replacement pile used as a basis for relatively light structures such as detached houses and soil slabs.

The present applicant, as Japanese Patent Application No. 2010-13200, is a small-diameter pile used as a basis for a relatively light structure such as a detached house or a soil slab, and after excavating to a predetermined depth with a drilling auger, the drilling auger is pulled up. We have filed a method for constructing a hydraulic solidifying material liquid replacement pile, which sometimes discharges and fills the hydraulic solidifying material liquid from the tip of the excavating auger. A standard construction process of the construction method will be described with reference to FIGS.
(1) First, as shown in FIG. 10A, the center of the excavation auger 11 tip attached to the auger motor 15 of the construction apparatus 10 is set according to the drilling position (pile core position).
(2) Next, as shown in FIG. 10B, the excavation auger 11 is rotated and excavated to a predetermined depth.
(3) When the excavation auger 11 reaches a predetermined depth, discharge of the hydraulic solidifying material liquid is started from the discharge port at the tip of the excavation auger 11 (FIG. 10C).
(4) Next, as shown in FIGS. 10 (d) to 10 (e), the excavation auger 11 is rotated or is not rotated, and the hydraulic solidifying material liquid is pulled up while being discharged from the discharge port at the tip of the excavation auger 11. .
(5) Since the excavating auger 11 is pulled up as shown in FIG. 10 (e), the liquid level (pile head level) of the hydraulic solidifying material liquid 8 filled in the drilling hole has been lowered due to water loss and bleeding. In this case, as shown in FIG. 10 (f), the hydraulic solidifying material liquid 8 is adjusted and filled to adjust the liquid level to a predetermined position.
(6) Finally, the excavation auger 11 is completely lifted as shown in FIG.
Such a method for constructing a replacement pile is also disclosed in, for example, Patent Document 1 and Non-Patent Document 1.

JP2007-191857

Underground Continuous Wall Construction Method Design / Construction Handbook Japan Construction Mechanization Association Issued by Gihodo Publishing Co., Ltd. (pages 427-430)

In the construction method of hydraulic solidification liquid replacement pile as described above, after the completion of the construction (construction) of hydraulic solidification liquid replacement pile, excavated earth and sand excavated at the time of construction is deposited near the hole of the replacement pile . After completion of the construction, when the excavated earth and sand 13 near the hole 12a falls into the hole 12 as shown in FIG. 11 while the hydraulic solidifying liquid is not yet solidified, it enters the hydraulic solidifying liquid 8 and remains as it is. When the hydraulic solidifying material liquid 8 is solidified, a replacement pile with a soil block is formed. There is no particular problem if the absolute amount of mixed soil is small, but if the mixed soil is a relatively large mass of soil or if the mixed soil is larger than a certain amount, the replacement pile will be in a cross-sectional defect state and the required performance as a pile. Can no longer demonstrate.
As a measure for preventing the fall of the excavated sediment, the excavated sediment accumulated around the auger near the hole opening during the construction of the replacement pile is scraped out manually and moved to a place where there is no possibility of dropping. However, it is difficult to move excavated sediment completely to a place away from the hole at construction sites where a large number of piles are placed, and further excavation of excavated sediment due to the movement of construction machines and carelessness of workers. It is almost impossible to prevent sediment from dropping into the hole.
Therefore, if a lump or a certain amount of earth or sand falls into a hydraulic solidifying material liquid that has not yet solidified, it must be removed. Therefore, it takes time and effort. Moreover, if the earth and sand sinks deeply into the replacement pile, it will be difficult to find and remove.

  The present invention has been proposed to solve the above-mentioned problems. The purpose of the present invention is to replace the pile with the hydraulic solidifying material liquid while the hydraulic solidifying material liquid is not yet solidified immediately after the completion of the construction of the hydraulic solidifying material liquid replacement pile. Hydraulic solidification material liquid replacement pile construction soil fall prevention device (hereinafter also simply referred to as sediment fall prevention device) that eliminates dropping of soil blocks and sediment into the hydraulic solidification fluid) and hydraulic properties using the device The object is to provide a method for constructing a solidified material liquid replacement pile, and to realize a high-quality and sound hydraulic solidified material liquid replacement pile.

  In order to achieve the above object, the hydraulic solidifying material liquid replacement pile building earth and sand falling prevention device according to claim 1 of the present invention has a funnel-like shape in which the upper part is an inverted conical part and the lower part is a cylindrical part. It is divided in the axial direction, the divided pieces are connected to each other, and the first and second divided pieces are combined to form the original funnel shape. It is possible to open and close between the divided piece located at the end and the divided piece located at the end, and the end portion where the first divided piece and the divided piece located at the end are joined is the space between both ends. A fixing tool for fixing is provided, and it is possible to fix the end portions of each other together.

  With this configuration, for example, in the split structure, one can be opened and closed with respect to the other, so drilling around the excavating auger on the ground side of the excavating auger that has excavated in the ground with both open You can attach the auger so that you can hold it together, match the open ends of both, and fix it between the two with a fixture, and then attach it to the excavation auger. The cylindrical part penetrates into the drilling hole by sliding it to the side, and the device is fixed by pressing the earth and sand discharged around the drilling hole with the inverted conical part, and the earth and sand are also compacted and fixed. can do. Moreover, in consideration of workability at the site, the earth and sand fall prevention device of the present invention can be divided into three or more parts that can be further reduced in weight.

Therefore, after the construction of the hydraulic solidifying material liquid replacement pile has been completed and the excavating auger has been completely pulled out, before the hydraulic solidifying material liquid has yet to solidify, there is a risk that the hole will open due to the carelessness of workers, strong wind, vibration, etc. It is possible to prevent surrounding excavated earth and sand from falling into the hole and deteriorating the quality of the replaced pile after hardening.
Moreover, the earth and sand fall prevention device according to the present invention must be attached to the excavation auger during the construction of the hydraulic solidifying material liquid replacement pile and after the excavation of the excavation earth and sand is completed. By adopting the structure, it becomes possible to detachably attach to the excavation auger under construction.
Furthermore, by forming the lower part of the earth and sand falling prevention device according to the present invention in a cylindrical part, for example, a cylindrical part, it becomes easy to match the axis of the excavation auger with the axis of the apparatus. The work of sliding down as a guide and pressing down the excavated sediment near the hole opening is surely and easy.
In addition, since the shaft center of the excavation auger and the shaft center of the apparatus are substantially coincident with each other, the excavated earth and sand near the hole port pressed by the apparatus also has a mortar shape having a symmetrical gradient with respect to the excavation axis. The excavated sediment is more difficult to fall into the hole.
In the present invention, the term “inverted cone-shaped part” includes an inverted cone-shaped part and an inverted pyramid-shaped part, and the term “cylindrical part” refers to a cylindrical part and a rectangular cylindrical part. Including meaning.
In the present invention, the “first divided piece” and the “last divided piece” are, for example, two divided pieces, one is the first divided piece, and the other is In the case of a divided piece that is located at the end and is divided into three pieces, when the three divided pieces are connected in this order with the first piece, the second piece, and the third piece, the first piece is first The second piece is an intermediate piece, the third piece is the last piece, and in the case of a four-piece piece, the first piece is the first piece. The second and third sheets are intermediate pieces, and the fourth piece is the last divided piece. The same applies hereinafter.

Moreover, the hydraulic solidification material liquid substitution pile construction earth and sand fall prevention apparatus which concerns on Claim 2 of this invention is connected with the mutual connection of the said division | segmentation piece so that rotation is possible by the hinge member. .
In addition to the same effects as described above, this structure allows the divided parts to be connected to each other so as to be easily opened and closed by rotating them with a hinge member.

  Moreover, as for the earth-and-sand fall prevention apparatus for hydraulic solidification material liquid replacement | exchange pile construction which concerns on Claim 3 of this invention, the inclination gradient of a reverse cone-shaped part is 30-60 degrees with respect to the axial center of a cylindrical part. It is characterized by.

  By forming the upper part of the earth and sand fall prevention device according to the present invention in the inverted conical portion, the excavated earth and sand around the hole is pressed downward by the inverted conical part of the device set on the stationary auger, thereby Can be shaped into the shape of the inverted conical portion. Therefore, since the formed excavated sediment is fixed, the excavated sediment can be prevented from falling into the excavation hole. Further, if the slope of the inverted conical portion is 30 to 60 degrees with respect to the axis of the cylindrical portion, the formation of the excavated earth is relatively easy, and the hole side of the formed excavated earth and sand is relatively easy. The slope becomes gentle, and the excavated soil becomes more difficult to fall to the hole. If the slope is less than 30 degrees, the slope will be steep, and unexpected earth and sand will easily fall into the hole. If it becomes larger than 60 degrees, the gradient becomes gentler, and a great deal of labor is required to push the apparatus downward. Therefore, the inclination gradient of the inverted conical portion is 30 to 60 degrees, preferably 40 to 50 degrees with respect to the axial center of the cylindrical portion.

  Moreover, the earth-and-sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction concerning Claim 4 of this invention is characterized by the length of a cylindrical part being 3 cm-25 cm.

  The length of the cylindrical portion needs to be long enough to use the excavation auger as a guide. If the length is short, backlash of the device with respect to the excavation auger increases, and the shaft center of the excavation auger and the shaft center of the device easily shift. On the other hand, if the length is long, the length of pushing the cylindrical portion into the ground becomes long, and a large force is required for pushing, so that workability is lowered. Therefore, the length of the cylindrical portion is preferably in the range of 3 cm to 25 cm. In particular, the length of the cylindrical portion is preferably in the range of 5 cm to 15 cm in consideration of actual workability. Further, in order to prevent the excavation auger and the earth and sand fall prevention device from rotating together, a clearance is required between the excavation auger and the inner surface of the cylindrical portion of the device.

According to a fifth aspect of the present invention, there is provided a hydraulic solidifying material liquid replacement pile construction method including at least a excavation claw and a hydraulic solidifying material at a distal end portion of a drilling auger having a hydraulic solidifying material liquid supply passage therein. A liquid discharge port, and the excavation auger is dug up to a predetermined depth while rotating (forward or reverse rotation) with a construction device equipped with an auger motor, and then the hydraulic solidified material liquid is discharged from the discharge port while In the construction method of the hydraulic solidification material liquid replacement pile in which the excavation auger is rotated (forward rotation or reverse rotation) or without being rotated, and the predetermined section of the excavation part is filled with the hydraulic solidification material liquid.
The upper part is a funnel-shaped part with an inverted conical part on the upper side and a cylindrical part on the lower part. This part is divided in the axial direction, and the divided parts are connected to each other so that the first part and the last part are located. It is formed into the original funnel shape by combining the pieces, and it can be opened and closed between the connected first divided piece and the last divided piece, and this first divided piece At the end where the split piece positioned at the end is fitted, a fixing tool is provided to fix between the two ends, and the hydraulic solidification material liquid replacement is possible so that the ends can be fixed together. Prepare a sediment fall prevention device for pile construction,
While the excavation auger is in the ground, or just before the excavation auger is lifted to the ground after the completion of construction, the hydraulic solidification material liquid replacement pile construction soil fall prevention device is installed at the excavation auger. , And is slid downward about the excavating auger and pressed against the periphery of the hole with the inverted conical portion to fix the device.

  With this configuration, the excavated sediment discharged around the hole mouth is pressed, compacted and fixed at the inverted conical portion of the sediment-preventing device for hydraulic solidification liquid replacement pile construction to form the hydraulic solidification liquid replacement pile. Since it can be constructed, it can be constructed by preventing the excavated sediment from falling into the excavation hole, and a high-quality replacement pile can be constructed.

  Moreover, the construction method of the hydraulic solidifying material liquid replacement pile according to claim 6 of the present invention is such that the inclination gradient of the inverted conical portion of the hydraulic solidifying material liquid replacement pile building earth and sand falling prevention device is that of the cylindrical portion. It is 30 to 60 degrees with respect to the axis.

  In addition to the above actions and effects, if the slope of the inverted conical portion is 30 to 60 degrees with respect to the axis of the cylindrical portion, the slope on the hole side of the formed excavated earth and sand becomes an appropriate angle. As a result, the excavated soil becomes more difficult to fall into the excavation hole, and it becomes possible to construct a higher quality replacement pile.

  Furthermore, in the construction method of the hydraulic solidifying material liquid replacement pile according to claim 7 of the present invention, the length of the cylindrical portion of the hydraulic solidification material liquid replacement pile building earth and sand falling prevention device is 3 cm to 25 cm. It is characterized by that.

  When the length of the cylindrical portion is short, the rocking of the sediment-preventing device for the construction of the hydraulic solidifying material liquid replacement pile with respect to the excavating auger becomes large when guiding the mounting to the excavating auger. If the center is easily misaligned and conversely long, the length of pushing the cylindrical portion into the ground becomes long, and a large force is required to push in and the workability is lowered. Since the length of the cylindrical portion is 3 cm to 25 cm, the backlash against the excavation auger is small and can be easily pushed into the ground, so that the construction work can be easily performed.

According to the sediment-preventing device for building a hydraulic solidifying material liquid replacement pile according to the present invention and the method for building a hydraulic solidifying material liquid replacement pile using the device, the following effects are obtained.
(1) The earth and sand fall prevention device has a funnel-like shape with an inverted conical portion on the upper side and a cylindrical portion on the lower side, which is divided in the axial direction, and the divided pieces are connected to each other for the first time. The divided piece and the last divided piece are combined to form the original funnel shape, and can be opened and closed between the connected first divided piece and the last divided piece. So, with this openable part open, while the excavation auger is in the ground, or just before the excavation auger is lifted to the ground after the construction is completed, the excavation auger is placed on the ground side of the excavation auger. Set to embed the excavation auger in the center, close the open part and match each other's open end and fix it with a fixing tool, you can attach it to the excavation auger, and then excavate this earth and sand fall prevention device The device around the auger The cylindrical part penetrates into the upper part of the drilling hole, and the earth and sand discharged around the excavation hole is pressed to fix the device and to compact the earth and sand. Can be fixed and molded.

(2) Therefore, by using the earth and sand fall prevention device, after the construction of the hydraulic solidification liquid replacement pile is completed and the excavation auger is completely pulled out, before the hydraulic solidification liquid is still solidified, It is possible to prevent the excavated earth and sand around the hole from falling into the hole due to carelessness of workers, strong winds, vibrations, etc., and the replacement pile after hardening becoming poor in quality.
(3) The earth and sand fall prevention device according to the present invention is during construction of the hydraulic solidifying material liquid replacement pile and while the excavation auger is in the ground after the excavation of the excavation earth or sand is completed or the construction is finished. Immediately before the excavation auger is lifted to the ground, it must be attached to the excavation auger on the ground part side, but it can be detachably attached to the excavation auger under construction by making the device into at least a split structure. It becomes possible.
In particular, if the device is divided into two or more structures, connected to each other by hinge members such as hinges that can rotate with each other, and provided with a fixture such as a hook at each open end, the excavation auger is provided. Since it can be connected by one-touch so as to embrace, the workability and the convenience of handling of the apparatus are increased.

(4) By forming the lower part of the earth and sand falling prevention device according to the present invention in the cylindrical portion, it becomes easy to align the axis of the excavation auger with the axis of the device, and the excavation auger serves as a guide downward. The work of sliding and pressing down the excavated soil near the hole mouth is reliable and easy.
(5) In addition, since the axis of the excavation auger and the axis of the apparatus are almost coincident, the excavation earth and sand near the hole pressed by the apparatus also has a target gradient with respect to the excavation axis. It is formed in the shape of a mortar that has the excavated earth and sand more difficult to fall into the hole.

(6) By forming the upper part of the earth and sand fall prevention device according to the present invention in the inverted conical part, the excavated earth and sand around the hole mouth is pressed downward by the inverse conical part of the apparatus attached to the stationary auger. The excavated earth and sand can be formed into the shape of the inverted conical portion. Therefore, since the formed excavated sediment is fixed, it is possible to prevent the excavated sediment from falling into the excavation hole. In addition, since the slope of the inverted conical section is 30 to 60 degrees with respect to the axial center of the cylindrical section, the slope of the drilled earth and sand formed is at an appropriate angle, so that It becomes difficult to fall.

(7) In the earth and sand falling prevention device of the present invention, when the length of the cylindrical portion is short, when the guide is attached to the excavation auger, the device becomes loose with respect to the excavation auger. In contrast, if the axis is long, the length of pushing the cylindrical portion into the ground becomes long, and a large force is required to push in and the workability is lowered. Since the length of the cylindrical portion is 3 cm to 25 cm, the backlash against the excavation auger is small and can be easily pushed into the ground, so that the construction work can be easily performed.

(8) Moreover, according to the construction method of the hydraulic solidification material liquid substitution pile of this invention, the excavation earth and sand discharged | emitted around the hole mouth is the reverse cone shape of the sediment fall prevention apparatus for hydraulic solidification liquid substitution pile construction. Since the hydraulic solidification material liquid replacement pile can be constructed by pressing, compacting and fixing at the part, it is possible to construct the construction by preventing the excavated sediment from falling into the excavation hole, and it is possible to construct a high quality replacement pile. Further, immediately after the excavation auger is pulled up to the ground, the hydraulic solidifying material liquid may be scattered from the discharge portion at the tip of the excavation auger and contaminate the excavation soil around the hole opening. In the earth and sand falling prevention apparatus of the present invention, the earth and sand around the hole opening is covered with the apparatus, so that it is not contaminated by the hydraulic solidifying material liquid and is excellent in workability.

They are the perspective view (a) seen from the back side and the perspective view (b) seen from the front side of the earth-and-sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction which shows embodiment of this invention. It is a perspective view which shows the usage method of the earth-and-sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction of this invention to process order (a) (b) (c). It is sectional drawing (a) (b) which shows the use condition of the earth-and-sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction of this invention. It is sectional drawing which shows the state where the earth and sand around a digging hole mouth were compacted and fixed by the earth-and-sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction of this invention. It is sectional explanatory drawing which shows the soil removal condition immediately after the start of excavation of the excavation auger with a flat side surface. It is sectional explanatory drawing which shows the soil removal condition just before completion | finish of construction of a spiral screw auger. It is a perspective view of the earth and sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction which shows other embodiments of the present invention. It is a perspective view of the earth fall prevention device for hydraulic solidification material liquid substitution pile construction showing other embodiments of the present invention. It is a perspective view of the earth and sand fall prevention apparatus for hydraulic solidification material liquid substitution pile construction which shows other embodiment of this invention. It is explanatory drawing which shows the construction method of the conventional hydraulic solidification material liquid substitution pile in process order (a) (b) (c) (d) (e) (f). It is sectional drawing explaining the earth-and-sand fall state after the excavation auger raising in the construction method of the conventional hydraulic solidification material liquid substitution pile.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view (a) seen from the back side and a perspective view (b) seen from the front side of the sediment-preventing device for building a hydraulic solidifying material liquid replacement pile according to an embodiment of the present invention. .

As shown in the figure, the earth and sand falling prevention device 1 of this embodiment is shown in the case where the upper inverted conical portion 2 is an inverted conical portion and the lower cylindrical portion 3 is a cylindrical portion. Further, the division in the axial direction is shown in the case of two divisions.
The earth and sand fall prevention device 1 has a funnel-like shape with an inverted conical portion 2 on the upper side and a cylindrical portion 3 on the lower side, and is divided into two parts 1a and 1b in the axial direction (longitudinal direction). The other split piece 1b is connected by a connecting member 4 so that it can be opened and closed, and the open ends 2a and 2b of each other are provided with a fixture 5 for fixing between the two ends, and the open ends of the two can be fixed together. It has become.

In this example, one divided piece 1a and the other divided piece 1b are connected by a hinge member 4 as a connecting member and can be opened and closed. The connecting member is not limited to a hinge member, and any means may be used as long as it is a means for releasably connecting the divided pieces 1a and 1b, and conventionally known means can be employed. For example, a means can be exemplified in which a pin hole is provided in one divided piece 1a, a pin is provided in the other divided piece 1b, and they are connected to each other so as to be opened and closed.
Moreover, although it has shown with the hook member as the fixing tool 5 which fixes between the edge parts of the division | segmentation pieces 1a and 1b of this example, this is also not restricted to a hook member, A conventionally well-known means can be employ | adopted. .

  Therefore, the earth and sand falling prevention device 1 has a funnel-like shape in which the upper part is an inverted conical part 2 and the lower part is a cylindrical part 3, and is divided into two in the axial direction. 2a, the excavation auger 11 is centered on the ground portion 11a side of the excavation auger 11 excavated in the ground G as shown in FIG. The excavation auger 11 is set so as to embrace it, and the open ends 2a and 2b of both 1a and 1b are aligned as shown in FIG. It can be attached to the auger 11. Next, as shown in FIG. 2 (c), the sediment-preventing device 1 attached to the excavation auger 11 is slid downward with the excavation auger 11 as the center, so that the cylindrical portion 3 becomes the hole of the drilling hole 12. The outer surface (lower surface) of the inverted conical portion 2 presses the earth and sand 13 discharged to the periphery of the drilling hole 12a to compact and fix the earth and sand. In addition, although the fixing tool 5 is illustrated so as to be fixed to the outer surface of the inverted conical portion 2, it is not preferable because the fixing tool 5 penetrates into the formed excavated sediment. It is preferable that the fixing device 5 is provided on the inner surface of the inverted conical portion 2 because of good workability.

As shown in FIG. 5, when the excavation auger 11 is an excavation auger 11 having a flat side surface, the soil 13 is discharged immediately after excavation, and there is almost no soil discharged thereafter. Accordingly, the earth and sand fall prevention device 1 in the case of the excavation auger 11 having a flat side surface may be installed at an appropriate time while the excavation auger 11 exists in the ground G as shown in FIG.
However, when the excavating auger 11 is a spiral screw auger as shown in FIG. 6, the excavation mechanism of the spiral screw continuously excavates from the start of construction by excavation until the auger 11 is lifted to the ground and the construction is completed. Sediment is discharged to the ground. Therefore, when the excavation auger 11 is a spiral screw auger, as shown in FIG. 3 (b), at least the earth and sand fall prevention device 1 is opened immediately before the construction is finished and the auger 11 is pulled up to the ground. Then, the auger 11 is closed so as to be held in the cylindrical portion of the apparatus, and after being connected by at least one fixture (hook member) 5, it is slid downward as shown in FIG. The generated sediment is pressed by the inverted conical portion of the apparatus, and the cylindrical portion is penetrated into the excavation hole.

3 (a) and 3 (b) show a state in which the earth and sand fall prevention device 1 attached to the excavation auger 11 in this way presses and compacts and fixes the excavated earth and sand 13 discharged around the excavation hole 12a. (A) shows the case where the excavation auger 11 is a flat excavation auger, and (b) shows the case where the excavation auger 11 is a spiral screw auger.
When the excavation auger 11 is lifted to the ground and the earth and sand fall prevention device 1 is removed, the excavation earth and sand (drainage) 13 around the drilling hole 12a is compacted and fixed in a mortar shape as shown in FIG. The fall of earth and sand into the excavation hole 12 is prevented.

  The earth-and-sand fall prevention device 1 presses and compacts the earth and sand (soil discharge) around the drilling hole 12a by the inverted conical portion 2 and compacts and fixes the earth and sand to prevent the earth and sand from falling into the excavation hole 12. When the inclined gradient of the inverted conical portion 2 approaches 0 degree with respect to the axis of the cylindrical portion 3, it becomes steep and the earth and sand easily fall into the excavation hole 12 and is compacted and fixed, and is formed at 90 degrees (horizontal). When approaching, the slope becomes gentle, so a large force is required to hold down the soil and workability is reduced. Therefore, the inclination gradient of the inverted conical portion 2 is preferably in the range of 30 to 60 degrees with respect to the axial center of the cylindrical portion 3. If it is in the range of 30 to 60 degrees, it becomes easy to compact and fix the excavated sediment, and the gradient of the excavated sediment that has been compacted and fixed to the hole 12a side becomes an appropriate angle, so that the excavated sediment is It becomes difficult to fall into the hole 12a.

  In addition, the cylindrical portion 3 of the earth and sand falling prevention device 1 is a portion that serves as a guide when attached to the excavation auger 11 and slid. Therefore, the inner diameter of the cylindrical portion 3 is larger than the diameter of the auger 11, and the length of the cylindrical portion 3 needs to be long enough to use the excavation auger 11 as a guide. When the length is short, the backlash of the device 1 with respect to the excavation auger 11 becomes large, and the axis of the excavation auger 11 and the axis of the device 1 are likely to be displaced. On the other hand, if the length is long, the length for pushing the cylindrical portion 3 into the ground becomes long, and a large force is required for pushing, and workability is lowered. Accordingly, the length of the cylindrical portion 3 is preferably in the range of 3 cm to 25 cm. In particular, the length of the cylindrical portion is preferably in the range of 5 cm to 15 cm in consideration of actual workability.

  Further, a connecting member that connects the split pieces 1a and 1b so as to be opened and closed, for example, a hinge member 4 and a fixture 5 that fixes the open ends 2a and 2b of the split pieces 1a and 1b together, When provided on the outside, the hinge member 4 and the fixture 5 are buried in the earth and sand 13 when the earth and sand fall prevention device 1 is pressed against the excavated earth and sand 13 near the drilling hole 12a. Therefore, when the hinge member 4 or the fixture 5 is removed after use of the device 1, a part of the excavated earth and sand 13 formed by pressing and compacting at the corner is scraped, and the shaved earth and sand is still not solidified in the excavation hole 12. There is a risk of falling into a non-hydraulic solidifying material liquid. Therefore, it is preferable that the connecting member 4 and the fixture 5 are configured not to protrude outside the inverted conical portion 2. For example, it is preferable that the connecting member 4 is as smooth as possible and the fixture 5 is provided inside the inverted conical portion 2.

  FIG. 7: is a perspective view of the sediment fall prevention apparatus for hydraulic solidification material liquid substitution pile construction which shows other embodiment of this invention. The earth and sand falling prevention device 1A of this embodiment is provided with a casing 6 at the periphery of the upper end opening of the inverted conical portion 2, and the other components are the same as those of the above embodiment, so the same components are used. Are given the same reference numerals, and other detailed explanations are omitted.

  According to this embodiment, after mounting the apparatus 1A so as to embrace the excavation auger 11, it is easy to apply a force when pressing down downward manually. Further, in addition to the above action, when the excavated earth and sand around the hole opening 12a is pressed and compacted and fixed, it is compacted and fixed into a mortar shape as shown in FIG. Since the upper peripheral edge of the mortar is pressed by the housing 6 and is compacted and fixed, the mortar-shaped upper peripheral edge is formed and solidified in a horizontal ring shape. Thus, there is an advantage that the sand and sand can be prevented from further falling into the drilling hole 12 after being compacted and fixed.

  FIG. 8: is a perspective view of the sediment fall prevention apparatus for hydraulic solidification material liquid substitution pile construction which shows other embodiment of this invention. The earth and sand falling prevention device 1B of this embodiment is provided with an upper cylindrical body 7 having the same diameter as the upper end opening of the inverted cone-shaped portion 2 continuously from the upper portion of the inverted cone-shaped portion 2. Since it is the same as that of the said embodiment, the same code | symbol is attached | subjected to the same component and other detailed description is abbreviate | omitted. In this embodiment, the connection member (hinge member) 4 is provided only on the upper cylindrical body 7, and the fixture 5 is illustrated on the upper cylindrical body 7 and the inverted conical portion 2.

  The inverted conical portion 2 requires a certain minimum height to prevent sediment drop regardless of the gradient. If the gradient of the inverted conical portion 2 is loose, the outer diameter of the upper end opening becomes too large, and handling becomes inconvenient. According to this embodiment, in addition to the above action, during construction of replacement piles or when the excavation auger 11 is pulled out, the earth and sand 13 around the drilling hole 12a gets over the earth and sand fall prevention device 1B and enters the excavation hole 12. There is an advantage that can be prevented from falling.

  FIG. 9 is a perspective view of a sediment-preventing device for building a hydraulic solidifying material liquid replacement pile, showing still another embodiment of the present invention. In the earth and sand falling prevention device 1C of this embodiment, the divided pieces 1a and 1b are not connected to each other by a connecting member (hinge member) 4 so as to be opened and closed, and the divided pieces 1a and 1b are independently divided. The shape of the earth and sand falling prevention device 1C is obtained by combining the two. In this embodiment, when the divided pieces 1a and 1b are combined, on one side where they abut each other, the divided piece 1a is provided with a pin hole 4a, the divided piece 1b is provided with a pin 4b, and the pin hole 4a is provided with a pin 4b. Can be connected to each other, and on the other side, the split piece 1a is provided with a female clip member 5a, and the split piece 1b is provided with a male clip member 5b, and the split piece 1a, When the parts 1b are combined, the split pieces 1a and 1b can be fixed by fitting the male clip member 5b into the female clip member 5a. The female clip member 5 a and the male clip member 5 b are provided inside the inverted conical portion 2.

According to the earth and sand falling prevention device 1C of this embodiment, in addition to the above-described function, the members 4a and 4b that connect the divided pieces 1a and 1b and the members 5a and 5b that are fixed to the outside of the inverted conical portion 2 go out. There is nothing to do. Therefore, when removing the earth and sand falling prevention device 1C after use, there is an advantage that a part of the excavated earth and sand 13 formed by pressing, compacting and fixing is scraped off by the member and the earth and sand is not dropped into the excavation hole 12. is there.
In addition, although it can say about all embodiment, if the material will consider the handling of a construction site and will use steel material with big durability, it can obtain required rigidity easily. A resin such as FRP or PVC may be used as long as necessary rigidity and durability can be obtained.

  Next, the construction method of the hydraulic solidification material liquid substitution pile using the above-mentioned earth and sand fall prevention device 1, 1A, 1B, 1C (hereinafter referred to as earth and sand fall prevention device 1) will be described.

  In the excavation auger 11, the auger shaft is a hollow shaft and the inside serves as a supply passage for hydraulic solidifying material liquid, and the excavation claw 14 and the discharge port of the hydraulic solidifying material liquid are provided at the tip as shown in FIGS. 3 (a) and 3 (b). (Not shown). For the construction of the replacement pile, the excavating auger 11 is dug up to a predetermined depth while rotating (forward or reverse) with a construction apparatus 10 (see FIG. 10) equipped with an auger motor 15, and then the hydraulic solidified material liquid is discharged from the outlet. The hydraulic solidification material liquid replacement pile which is pulled up while discharging (with or without rotating) the excavation auger 11 and filling the predetermined section of the excavation part with the hydraulic solidification material liquid. In the construction method, while the excavation auger 11 is in the ground or immediately before the excavation auger 11 is lifted to the ground after the completion of construction, the earth and sand fall prevention device 1 is provided at the mouth of the drilling hole 12. Is installed by passing through the center of the excavation auger 11 and slid downwardly around the excavation auger 11 to press the excavation earth and sand 13 around the drilling hole 12a with the inverted conical portion 2 and compacting and fixing the earth and sand.

Here, while the excavation auger 11 is in the ground or just before the construction is completed and the excavation auger 11 is pulled up to the ground, the excavation auger 11 has a side surface as shown in FIG. In the case of the flat excavation auger 11, the earth 13 is discharged immediately after excavation, and there is almost no earth discharge after that. Therefore, in the case of the excavation auger 11 having a flat side surface, the soil 13 is discharged immediately after excavation, and there is almost no soil discharged thereafter. Therefore, when the digging auger 11 having a flat side surface is installed (set to the digging auger 11), the earth and sand fall prevention device 1 is installed while the digging auger 11 is present in the ground G as shown in FIG. It may be at an appropriate time.
However, when the excavating auger 11 is a spiral screw auger as shown in FIG. 6, the excavation mechanism of the spiral screw continuously excavates from the start of construction by excavation until the auger 11 is lifted to the ground and the construction is completed. Sediment is discharged to the ground. Therefore, when the excavation auger 11 is a spiral screw auger, it is necessary to set the earth and sand fall prevention device 1 immediately before the construction is finished and the auger 11 is pulled up to the ground as shown in FIG. Because there is.

  In addition, the earth and sand fall prevention device 1 is installed by first excavating on the ground portion 11a side of the excavation auger 11 excavated in the ground G as shown in FIG. 2 (a) with the divided pieces 1a and 1b opened. Set so that the auger 11 is held around the auger 11, and as shown in FIG. 2 (b), the open ends 2 a and 2 b of the both 1 a and 1 b are aligned, and a fixing tool 5 is used between the two 1 a and 1 b. Fixed and attached to the excavation auger 11. Next, as shown in FIG. 2C, the sediment fall prevention device 1 attached to the excavation auger 11 is slid downward using the excavation auger 11 as a guide to insert the cylindrical portion 3 into the drilling hole 12, and reversely. The excavated earth and sand 13 discharged to the periphery of the drilling hole 12a is pressed against the outer surface (lower surface) of the conical portion 2 and installed. Thereby, the excavated earth and sand 13 around the hole opening 12a is compacted and fixed. Therefore, even if the excavation auger 11 is lifted to the ground after completion of construction and the earth and sand fall prevention device 1 is removed, the excavation earth and sand 13 around the drilling hole 12a falls into the drilling hole 12 and the hydraulic solidification material liquid has not yet solidified. It can be constructed without being mixed in, and as a result, it is possible to prevent the replacement pile after curing from becoming poor in quality.

  If it demonstrates with the construction method of the hydraulic solidification material liquid substitution pile shown in FIG. 10, when the excavation auger 11 is the excavation auger 11 with a flat side surface, the earth-and-sand fall prevention apparatus 1 will process (b)-(d). If the excavation auger 11 is a spiral screw auger, the earth and sand fall prevention device 1 is installed and constructed immediately before the excavation auger 11 in step (e) is pulled up to the ground. By doing so, the hydraulic solidified material liquid replacement pile is constructed in the same manner as shown in FIGS. 10 (a) to 10 (f).

The above embodiment does not limit the present invention, and various modifications are allowed without departing from the scope of the present invention.
For example, in the above embodiment, the inverted conical portion 2 is shown as an inverted conical portion, and the cylindrical portion 3 is shown as a cylindrical portion, but the inverted conical portion 2 is an inverted hexagonal pyramid shape, An inverted pyramid shape such as an inverted octagonal pyramid shape may be used, and the cylindrical portion 3 may also be a hexagonal cylindrical portion or an octagonal cylindrical portion. Further, in the embodiment, the axial division is also shown in the case of two divisions, but this may be three or more divisions.

1, 1A, 1B, 1C Hydraulic solidifying material liquid replacement pile construction soil fall prevention device (sediment fall prevention device)
1a, 1b Dividing pieces 2 Inverted conical portion (inverted conical portion)
3 Cylindrical part (cylindrical part)
4 Connecting member (hinge member)
DESCRIPTION OF SYMBOLS 5 Fixing tool 6 Housing 7 Upper cylinder 8 Hydraulic solidification material liquid 10 Construction apparatus 11 Excavation auger 11a Ground part side 12 of excavation auger Excavation hole (hole)
12a Excavation hole 13 Excavation sediment around the excavation hole
14 Drilling claws

Claims (7)

  The upper part is a funnel-shaped part with an inverted conical part and the lower part is a cylindrical part. This part is divided in the axial direction. The divided parts are connected to each other and the first and the last divided parts are connected. Are formed into the original funnel-like shape, and can be opened and closed between the connected first divided piece and the last divided piece, and the first divided piece and A hydraulic unit characterized in that a fixing tool for fixing between the two end portions is provided at the end portion to which the split piece located at the end is combined, and the end portions can be fixed together. Sediment fall prevention device for construction of solidified liquid replacement pile.   2. The earth and sand falling prevention device for building a hydraulic solidified material liquid replacement pile according to claim 1, wherein the divided pieces are connected to each other by a hinge member so as to be rotatable.   3. The sediment fall prevention apparatus for building a hydraulic solidifying material liquid-substituted pile according to claim 1, wherein the inclined gradient of the inverted conical portion is 30 to 60 degrees with respect to the axis of the cylindrical portion.   The length of the said cylindrical part is 3 cm-25 cm, The sediment fall prevention apparatus for hydraulic solidification material liquid substitution pile construction of any one of the Claims 1 thru | or 3 characterized by the above-mentioned. At least the excavation claw and the discharge port of the hydraulic solidification material liquid are provided at the tip of the excavation auger having a hydraulic solidification material liquid supply passage inside, and the excavation auger is rotated by a construction device equipped with an auger motor (forward rotation). Or excavating the excavating auger while rotating (forward or reverse) or without rotating the excavating auger while discharging the hydraulic solidified liquid from the discharge port. In the construction method of the hydraulic solidification material liquid replacement pile that fills the predetermined section of the hydraulic solidification material liquid,
The upper part is a funnel-shaped part with an inverted conical part on the upper side and a cylindrical part on the lower part. This part is divided in the axial direction, and the divided parts are connected to each other so that the first part and the last part are located. It is formed into the original funnel shape by combining the pieces, and it can be opened and closed between the connected first divided piece and the last divided piece, and this first divided piece At the end where the split piece positioned at the end is fitted, a fixing tool is provided to fix between the two ends, and the hydraulic solidification material liquid replacement is possible so that the ends can be fixed together. Prepare a sediment fall prevention device for pile construction,
While the excavation auger is in the ground, or just before the excavation auger is lifted to the ground after the completion of construction, the hydraulic solidification material liquid replacement pile construction soil fall prevention device is installed at the excavation auger. A hydraulic solidification material liquid replacement pile construction method comprising: installing a hydraulic solidification material liquid replacement pile, wherein the pile is slid downward about a drilling auger and pressed against the periphery of a drilling hole with an inverted conical portion to fix the device.   6. The water according to claim 5, wherein the slope of the inverted conical portion of the hydraulic solidifying material liquid replacement pile building earth and sand falling prevention device is 30 to 60 degrees with respect to the axis of the cylindrical portion. Construction method of hard solidifying material liquid replacement pile.   The construction method of the hydraulic solidification material liquid replacement pile according to claim 5 or 6, wherein a length of the cylindrical portion of the sedimentation prevention apparatus for building a hydraulic solidification material liquid replacement pile is 3 cm to 25 cm. .

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