JP5230553B2 - Yatco lots and Yatcos, methods for reducing the strength of Yatco pillars using these, and methods for burying ready-made piles - Google Patents

Description

  The present invention relates to a yatco lot and a yatco used when burying a ready-made pile by a pre-boring method, and in particular, a yatco lot and a yatco equipped with means for reducing the strength of a yatko column, and these. The present invention relates to a method for reducing the strength of Yatco pillars and a method for burying ready-made piles.

  Conventionally, when a building structure such as a building is constructed, a ready-made pile is buried in the ground and integrally formed in order to support it. One of the methods of burying ready-made piles is the pre-boring method, which uses pre-bored piles such as hollow concrete piles.

  This is because in general building structures, there is an underground floor, or even when there is no underground floor, pile caps and underground beams are formed, so in most cases the pile head level is below the construction ground level. This is because it is necessary to set.

  On the other hand, in the construction management of the pre-boring method, the specimen is collected by collecting the overflow of the mixture (soil cement) of the pile periphery fixing liquid and excavated earth and sand generated when laying off-the-shelf piles using Yatco. Making and managing the strength is done. For this reason, a Yatco column in which soil cement is solidified is usually formed in the pile hole between the pile head level and the ground surface.

  The pile heads of ready-made piles need to be treated to connect to footing etc., so root cutting work must be done, but if the above Yatco pillars exist, root cutting work will not proceed smoothly or industrial disposal Since it becomes a material processing, it becomes high-cost. Therefore, it was necessary to prevent the solidified Yatco pillar formed in the pile hole and prevent the root cutting operation from being hindered.

  As a method for simplifying the root cutting work, there is one described in Japanese Patent No. 2555838 (Patent Document 1). This is a method in which normal-strength cement milk is injected into the root portion at the bottom of the soil cement column row hole and low-strength cement milk is injected into the root cut portion at the top of the soil cement column row hole.

  Moreover, there exists a thing described in Unexamined-Japanese-Patent No. 2001-336147 (patent document 2) as a processing method of the pile head of the ready-made pile for connecting to a footing. This is because the rotating cap is attached to the pile head of the ready-made pile and the ready-made pile is lowered, and then the thinning liquid is discharged from the nozzle attached to the rotating cap into the hollow portion of the ready-made pile, and the hollow portion of the ready-made pile is filled. This is a pile head treatment method in which the concentration of the curable material is reduced to reduce the solidification strength.

Japanese Patent No. 2555838 JP 2001-336147 A

  As described above, Patent Document 1 describes a method for simplifying the root cutting work, but it is necessary to prepare two types of cement milk of normal strength and low-strength cement milk. It becomes. In addition, the strength management of the soil cement generated when the ready-made pile is buried is not possible.

  On the other hand, Patent Document 2 describes a pile head treatment method in which the concentration of the curable material is reduced to reduce the solidification strength, but the curable material is filled in the hollow portion of the ready-made pile. In this method, the solidified Yatco pillar formed in the pile hole cannot be prevented in advance, and a smooth root cutting operation cannot be performed.

  The present invention has been made in view of the above-mentioned problems in the background described above, and is a solidified Yatco formed in a pile hole between the pile head level and the ground surface when embedding a pre-made pile by the pre-boring method. An object of the present invention is to provide a method and an apparatus for efficiently forming a low-strength Yatco column in order to prevent the column.

  As a result of intensive studies to achieve the above-mentioned object, the present inventors have remodeled a yatco used when embedding a ready-made pile in a pile hole, and lifted the yatco after embedding the ready-made pile in the pile hole. At the stage, it was found that if the strength of the curable filler (soil cement) already filled in the pile hole was reduced, a low-strength Yatco pillar could be efficiently formed, and the invention was completed.

  That is, the invention according to claim 1 is a lot that is connected to an upper portion of a rotary cap of a rod-type yatco used to embed a ready-made pile in a pile hole, and the lot is a hollow that serves as a discharge liquid passage. One to a plurality of discharge holes provided with a check portion for discharging the shaft portion and the discharge liquid in the lateral direction in the pile hole are provided, and the lower end portion of the hollow shaft portion is closed. It is characterized by.

  The rotating cap is the same as the conventional one, but in the present invention, a part of the lot is remodeled so that the discharge liquid such as dilution water or dilution solution can be discharged in the lateral direction in the pile hole. The discharge hole is provided. As a result, a low-strength Yako column can be easily formed in the process of burying a ready-made pile with a Yatco, which is efficient.

  A check valve is provided at the discharge port, thereby preventing the backflow of the curable filler from the outside.

  The lower end portion of the lot hollow shaft portion is closed so that the discharged liquid does not flow downward. Thereby, the discharge liquid can be efficiently discharged from the discharge port in the lateral direction in the pile hole.

  The method of providing the shape, size, number, and the like of the discharge port is not particularly limited as long as it is provided so as to reach the curable filler in the pile hole. In general, a pair is provided on the opposite side in the horizontal direction, or two pairs are provided in the vertical direction.

  According to a second aspect of the present invention, in the Yatco lot according to the first aspect, a stirring blade for stirring the discharge liquid discharged from the discharge hole on the outer surface of the lot at the same height as the discharge hole or below the discharge hole Is attached.

  By discharging the discharge liquid while rotating the stirring blade, the discharge liquid and the curable filler (soil cement) already filled in the pile hole are sufficiently mixed, so a low-strength Yatco column is uniformly formed. can do.

  The stirring blade is preferably provided at the same height as the discharge port or slightly below the discharge port. Specifically, it is 0 to 50 cm below. The shape, dimensions, number, etc. of the stirring blades are not particularly limited. It may be attached to a conventional Yatco lot.

  The invention according to claim 3 relates to a yatco in which the yatco lot according to claim 1 or 2 is incorporated, and a rotating cap having a pile gripping part for gripping a pile head of a ready-made pile to be embedded, and the rotation The Yatco lot according to claim 1 or 2 connected to an upper part of a cap, and a Yatco comprising one or more lots connected to the upper part of the lot and having a hollow shaft part, A drive unit and a discharge liquid supply unit for rotating the rotary cap and the lot in a forward and reverse direction are provided on the top of the Yatco.

  In the yatco of the present invention, the equipment other than the yatco lot may be the same as the conventional one. One to a plurality of connecting lots other than the Yatco lots of the present invention are connected and used depending on the depth in which the ready-made piles are buried and the length of the lots.

  As described above, the yatco of the present invention may be obtained by incorporating the lot of the present invention into a part of the yatco lots conventionally used, and the conventional yatco can be used as it is, which is efficient.

  The invention according to claim 4 is a method for reducing the strength of a Yatco pillar formed by a curable filler above a pre-made pile embedded in a pile hole, and is above the pre-made pile embedded in the pile hole The Yatco according to claim 3 is appropriately repeated up and down at a depth within a predetermined range to reduce strength in the uncured curable filler filled in the container, and the diluting water or the diluting solution is discharged from the discharge hole. It mixes with the said curable filling of the depth of a predetermined range, The hardening intensity | strength of this curable filling of the depth of a predetermined range is reduced, At least one part of a Yatco pillar is made low intensity | strength.

  The Yatco column referred to in the present invention is a strong soil cement column formed in a pile hole from a pile head level of an embedded ready-made pile to the ground surface. In this method of the present invention, the depth of the predetermined range of the pile hole to be reduced in strength can be arbitrarily set as long as it is above the ready-made pile buried in the pile hole to the ground surface.

  Since this reduction in strength is related to the ease of root cutting work, the depth of the predetermined range is usually the depth of the range of root cutting. In addition, the portion of the existing piles that have been buried needs to be firmly solidified in the pile periphery fixing liquid (soil cement) because of the support structure to the ground. It is preferable that it is a part above about 1 m of the pile head level of the ready-made pile.

  In addition, the curable filler referred to in the present invention is a soil cement in which excavated earth and sand are mixed in a pile circumference fixing liquid such as cement milk. This curable filler must be uncured when mixed with diluting water or diluting solution. When it is hardened or hardened, it cannot be mixed.

The degree of strength reduction is not particularly limited as long as it is cured with a weak strength that does not hinder the root cutting operation by the Yatsuko pillar. Generally, it is about 0.1 to 0.5 N / mm ² . The reduction in strength is achieved by discharging diluted water or a diluted solution from the discharge port of the Yatco lot of the present invention and mixing it with an uncured curable filler.

  The discharge is performed at a pressure of about 0.1 to 6.0 MPa. Examples of the diluted solution include a bentonite solution having a concentration of about 2 to 20%. The mixing is performed by appropriately repeating the Yachko lot of the present invention at a depth within a predetermined range where it is desired to reduce the strength while rotating the Yatco of the present invention. In order to perform sufficient mixing, it is preferable that the Yattco lot is provided with a stirring blade.

  The above discharge and mixing are usually performed when the ready-made piles are buried with the yatco of the present invention and then the yatco is pulled up to the ground. In this case, the Yatco (Yatco lot) does not repeat up and down, but is only pulled upward.

  In addition, after burying a ready-made pile with a conventional yatco, the yatco is once pulled up to the ground, and the yatco lot of the present invention is attached to form the yat of the present invention. You may insert in the pile hole with which it is filled, and you may perform the said discharge and mixing by repeating this up-down at the time of insertion of this yat or pulling-up of this yat or this yatco.

  The invention according to claim 5 is a method for burying a ready-made pile by a pre-boring method, wherein the rotating cap of the yatco according to claim 3 is attached to the buried pile, and the buried pile is made of an uncured curable filler. In the said claim 1 or claim 2, when it embed | buries to the predetermined depth in the pile hole currently filled, and when the predetermined depth is reached when removing the said rotation cap from an embedment pile and pulling up a Yatco The diluting water or diluting solution is discharged from the discharge hole of the Yatco lot described above, and the Yatco is pulled up while mixing these and the curable filler, and is filled above the predetermined depth at which discharge is started. The curable filler (Yatco pillar) is cured by reducing the curing strength.

  This invention is an invention according to an embodiment of the invention shown in claim 4. In the present invention, by using the yatco of the present invention according to the third aspect of the present invention, the strength of the curable filling (yatco pillar) can be reduced in the embedding process of the ready-made pile with the yatco, which is efficient. This facilitates the next root cutting operation.

  According to the present invention, when a prefabricated pile is embedded by a pre-boring method, it is possible to prevent a solidified Yatco column formed in a pile hole between the pile head level and the ground surface. Cutting work can be done smoothly. Moreover, since the Yatco used conventionally can be used and it can process in the embedding process of a ready-made pile, it is efficient.

It is a front view which shows an example of the lot for Yatco of this invention connected to the direct upper part of a rotation cap. FIG. 2 is a partial cross-sectional view of a Yatco lot corresponding to FIG. It is sectional drawing which shows the construction procedure in the burial method of the ready-made pile of this invention.

  Hereinafter, the present invention will be described more specifically with reference to the drawings.

  FIG. 1 shows an example of a Yatco lot 1 according to the present invention connected to an upper portion of a rotating cap 11, and FIG. 2 is a partial cross-sectional view thereof (a cross section in an orthogonal direction with respect to a discharge port portion).

  The Yatco Lot 1 of the present invention is a lot 1 connected to the upper part of a rotating cap 11 used when a ready-made pile is embedded in a pile hole with a rod type Yatco, as will be described later with reference to FIG. The lower end portion of the hollow shaft portion 9 serving as a passage for the discharge liquid 10 is closed (in the figure, reference numeral 7 indicates the closed portion).

  In this embodiment, the rotary cap 11 is the same as the conventional one, and a pile gripping portion 13 is formed by a key-like notch at the lower side of the side surface of the rotary cap body 12, and is provided on the head of the ready-made pile. It is locked to the protrusions and can transmit the rotational force. In the figure, only one pile gripping portion 13 is shown, but two or more are formed.

  A joint convex portion 3 is formed on the upper surface of the rotating cap 11, and is fitted into the joint concave portion 4 located on the inner surface of the lower end of the hollow shaft portion 9 of the Yatco lot 1, and a fixing pin (not shown) is fitted. By rotating the joint pin hole 14 from the outer surface of the hollow shaft portion 9 and engaging with the concave groove 8 formed in the joint convex portion 3, the rotary cap 11 and the Yatco lot 1 are detachably fixed.

  A similar connection mechanism is also used between the Yatco lot 1 and a lot connected to the upper side (see Lot 22 in FIG. 3 to be described later), whereby a plurality of lots are connected to each other (Yatco 1 in FIG. 3 to be described later). Reference) is formed. In the figure, reference numeral 2 denotes a joint projection for adding the upper lot.

  On the side of this Yatco lot 1 is provided with one to a plurality of discharge holes 5 provided with check valves 6, and by closing the lower end portion of the hollow shaft portion 9 as described above, The discharge liquid 10 supplied from above is discharged in the lateral direction in the pile hole.

  That is, the check valve 6 prevents the back flow of the curable filler from the outside, and the lower end portion of the lot hollow shaft portion 9 is closed so that the discharge liquid 10 does not flow downward. The discharge liquid 10 can be efficiently discharged from 5 in the lateral direction in the pile hole.

  With such a configuration, it is possible to reduce the strength of the Yatoko pillar formed in the root cutting part (see the root cutting part 29 in FIG. 3 (f) described later) in the final step of burying the ready-made piles with the Yatco. .

  Further, on the outer surface of the lot below the discharge hole 5, a stirring blade 15 for stirring the discharge liquid 10 discharged from the discharge hole 5 is attached via a fixture 16, and the discharge is performed while rotating the stirring blade 15. By discharging the liquid 10, the discharge liquid 10 and the curable filler (soil cement) already filled in the pile holes are sufficiently mixed, so that a low-strength Yako column can be uniformly formed.

  The shape, size, number, and the like of the stirring blade 15 are not particularly limited, and those attached to a conventional Yatco lot can be used. However, in order to uniformly form a low-strength Yatco column, the stirring blade 15 Is preferably provided below the discharge port 5 at the same height as the discharge port 5 or in a range up to about 50 cm.

  Since the discharge port 5 and the stirring blade 15 are in such a positional relationship, the discharge liquid 10 discharged from the discharge port 5 and the curable filler in the pile hole are effective due to the horizontal rotation of the stirring blade 15. Is stirred and mixed. This rotation is made by rotating the lottery lot 1 by a drive unit 20 (auger drive unit) at the top of the Yatco shown in FIG.

  FIG. 3 shows a state of construction in the method for burying a ready-made pile of the present invention, and construction is performed in the following procedure.

(1) Pile insertion (Refer to Fig. 3 (a) and (b))
The ready-made pile 26 is stowed in the pile hole 17 which is excavated by pre-boring and filled with the curable filler.

  Excavation of the pile hole 17 with an auger or the like before standing the ready-made pile 26, filling with a curable filler 24 such as cement milk, and creation of a root-solidified portion 27 with a root-solidifying liquid 28 are not particularly different from conventional ones. .

  The rotary cap 11 of the inventive yatco 19 provided with the inventive lottery lot 1 connected to the upper part of the rotary cap 11 is attached to the upper end of the ready-made pile 26, and the ready-made pile 26 is uncured curable filling. 24, and it goes up to a predetermined depth in the pile hole 17 filled with 24.

  The rotation cap 11 is attached to the upper end portion of the ready-made pile 26 by engaging the pile gripping portion (notch portion) 13 of the rotation cap 11 at the tip of the Yatco 19 with the locking fitting 25 provided on the pile head of the ready-made pile 26. By combining them.

  A plurality of normal lots 22 are connected above the lower lot 1.

(2) Remove the rotating cap by reverse rotation and pull up the Yatco (see Fig. 3 (c) and (d))
If the ready-made pile 26 which is a buried pile is stood to the predetermined depth, next, the auger is reversely rotated, the rotating cap 11 is removed from the ready-made pile 26, and the Yatco 19 is pulled up by about 1 m while leaving the ready-made pile 26. The lifting height can be easily determined by marking the lot 22 with a scale or the like.

  The reason why the later-described bentonite liquid starts to be discharged when the YATCO 19 is pulled up by about 1 m is to prevent the strength of the curable filler 24 filled around the embedded pile 26 from being lowered.

(3) Send the bentonite liquid and pull it up while stirring (see Fig. 3 (e))
Bentonite liquid as a diluting solution is sent from the discharge liquid supply port 30 located in the drive unit 20 of the auger, bentonite liquid is discharged from the discharge port 5 of the Yatco lot 1 at the lower end of the Yatco 19, and the inside of the pile hole 17 by the stirring blade 15 While mixing with the upper uncured curable filler 24, the Yatco 19 is pulled up.

The bentonite liquid and the uncured curable filler 24 are stirred by a stirring blade 15 attached slightly below the discharge port 5.
And the stirring cap 19 are pulled up until the rotary cap 11 reaches the ground. The bentonite liquid is discharged until the discharge port 5 reaches the ground.

(4) Suppress the self-hardness of the Yatco pillar and perform root cutting work (see Fig. 3 (f))
By stirring and mixing the curable filler 24 filling the upper part from the depth at which discharge is started and the bentonite liquid as the diluting solution, the Yatco pillar 23 (hardened material from the pile head level of the embedded ready-made pile 26) is mixed. The strength of the soil cement column formed in the pile hole 17 up to the surface 18 can be reduced.

  The range of the dotted line indicated by reference numeral 29 in FIG. 3 (f) is the root cutting part, and the root cutting work is facilitated by reducing the strength of the Yattoko pillar 23.

  The present invention reduces the strength of the Yatco pillar formed in the pile hole from the pile head level of the buried ready-made pile to the ground surface when embedding the ready-made pile by the pre-boring method, and facilitates the root cutting work. be able to.

1 ... Yatco lot,
2 ... Joint convex part,
3 ... Joint convex part,
4 ... Joint recess,
5 ... discharge port,
6 ... Check valve,
7: Blocking part,
8 ... concave groove,
9: Hollow shaft part,
10: Discharge liquid,
11 ... Rotating cap,
12 ... rotating cap body,
13 ... Pile gripping part (notch part),
14 ... Joint pin hole,
15 ... stirring blade,
16: Stirrer blade fixture,
17 ... Pile hole,
18 ... the ground surface,
19 ... Yatko,
20 ... drive unit,
21 ... Hydraulic swivel,
22 ... Lot,
23 ... Yatco pillar with reduced strength,
24 ... curable filling,
25. Locking bracket,
26 ... ready-made piles,
27 ... the root hardening part,
28 ... root hardening liquid,
29 ... root cutting part,
30: Discharge liquid supply unit

Claims (5)

  It is a lot connected to the upper part of the rotary cap of the rod type Yatco used to embed the ready-made pile in the pile hole, and the lot has a hollow shaft portion serving as a discharge liquid passage and the discharge liquid in the pile hole. One or more discharge holes provided with check valves for discharging in the horizontal direction are provided, and the lower end portion of the hollow shaft portion is closed.   The agitator blade for stirring the discharge liquid discharged from the discharge hole is attached to the outer surface of the lot at the same height as the discharge hole or below the discharge hole. lot.   A rotating cap having a pile gripping part for gripping a pile head of a ready-made pile to be buried, a Yatco lot according to claim 1 or 2 connected to an upper part of the rotating cap, and an upper part of the lot A YATCO having one to a plurality of lots connected to each other and having a hollow shaft portion, and at the top of the YATCO, a drive unit for reversibly rotating the rotation cap and the lot, and supply of discharge liquid Yatco characterized by being provided with a part.   A method for reducing the strength of a Yatco column formed by a curable filler above a prefabricated pile buried in a pile hole, and an uncured hardening filled above the prefabricated pile buried in the pile hole 4. The Yatco according to claim 3 is appropriately repeated up and down at a depth within a predetermined range in which the strength is desired to be reduced in the porous filler, and the hardening at a depth within the predetermined range is performed by discharging dilution water or diluted solution from the discharge holes. A method for reducing the strength of a Yatco column, comprising mixing with a functional filler and reducing the strength of at least a part of the Yatco column by reducing the curing strength of the curable packing having a depth within a predetermined range.   A pre-boring method for burying a ready-made pile, wherein the rotary cap of the Yatco according to claim 3 is attached to the buried pile, and the buried pile is filled in the pile hole filled with uncured curable filler. 3. The discharge of the lotus lot according to claim 1 or 2 when the predetermined depth is reached when the rotary cap is removed from the buried pile and then pulled up to a predetermined depth. The dilution water or the diluted solution is discharged from the hole, and while the mixture and the curable filler are mixed, the Yatco is pulled up, and the curable filler filled above the predetermined depth from which the discharge is started is cured. A method for burying a ready-made pile characterized in that the strength is lowered and cured.

Images