WO2013089466A1

WO2013089466A1 - Method and apparatus for pouring bonding filler in a perforation expansion portion for enhancing the support force of a pile or tensile member

Info

Publication number: WO2013089466A1
Application number: PCT/KR2012/010873
Authority: WO
Inventors: 임성대
Original assignee: (주)삼일이엔씨
Priority date: 2011-12-15
Filing date: 2012-12-14
Publication date: 2013-06-20
Also published as: KR101236765B1

Abstract

The present invention relates to a method for pouring a bonding filler after forming a hole portion at a perforation hole which is bored in a depth direction of the ground in order work on an expansion portion at which a pile or a tensile member for construction works is erected. A balloon containing the curable bonding filler is arranged at a leading bottom portion of the pile or tensile member, and the pile or tensile member is lowered down to the bottom of the hole portion. Then, the pile or tensile member is pressed such that the balloon disposed at the bottom portion is compressed in the vertical direction, and expands in the radial direction up to an outline of the hole portion. The bonding filler in the expanded balloon is filled in the hole portion while the dimensions of the hole portion are maintained.

Description

Method and apparatus for placing bonded filler material in perforated expansion part to expand bearing capacity of pile or tension member

The present invention relates to a construction method in the construction field associated with the foundation or the ground of the structure, and more specifically in the case of the compressed pile through the expansion of the end of the drilling hole to form an expansion base at the tip of the pile to improve the bearing capacity of the pile and tension In the case of a pile or anchor receiving the present invention relates to a method and apparatus for effectively placing the expansion portion in the construction to significantly improve the pull-out resistance by forming a fixed fixing portion in the end of the drilling hole.

In general, in the construction field, the entire drilling length is mainly used for the construction of tension members such as piles that are used for foundations, buoyancy-prevention anchors, slope stability, and piles that resist anchors or pull-outs used in ground-related structures. It is perforated with the same diameter.

If the drill is the same diameter, the drilling is simple and easy, but most of the drilling should be drilled deep to solid ground such as weathered rock or soft rock that can be firmly supported by structural members.

Particularly, in the case of compression members such as piles (forged piles, cast-in-place piles, single piles integrated with pillars, etc.), even if they drill deeply to solid ground, the area of the perforated tip is small so that the structural members can support the ground even if they withstand external forces. First, surrender (exceeds the allowable bearing capacity).

In addition, in the case of a tension member such as an anchor or a tension pile, a tension member is inserted into an already drilled hole. Therefore, a pull-out resistance that can resist pulling out of the tension member is so small that most of the tension member is drilled and inserted into a solid rock layer. By injecting and curing an injection material such as cement grout into the triple triplet in the hole, the frictional resistance and the adhesion resistance are increased to secure the pullout resistance.

It is necessary to secure as much drawing resistance as necessary within the small diameter of the drilled hole, so the drilling length is long, the structure and construction order of the tension member are complicated, the amount of injection material is excessive, the construction cost is high and the damage to the natural environment of the ground is increased. There was a problem that the environmental pollution contained in the contamination of the surrounding area by riding the groundwater.

In the construction work, the enlarged foundation part in the pile or the fixed fixing part enlarged in the tension member can solve the above-mentioned problems and disadvantages.In the case of the pile, the bearing capacity of the pile can be surely improved, and even in the case of the tension member such as an anchor The pullout resistance is remarkably improved.

As an example of such an improved construction method, Korean Patent No. 10-1011143 entitled "Application method for forming a foundation part of a pile tip and a fixed fixing part of a tension member, and a tool for expanding a wall for the same" is provided. have.

Another example of such an improved construction method is the Korean Patent No. 10-1027963, "Applicant's patented concrete construction method for piles and tension members for construction work".

In order to construct the enlarged foundation part of the pile or the enlarged fixed fixing part of the tension member, the expansion part must be formed in advance at the tip of the drilling hole. When the expansion part of the tip is formed, the expansion ceiling exists, so the slime discharge generated during the expansion is a normal vertical drilling point. It is disadvantageous compared to the above, and when concrete which is not hardened in the expansion part is poured in a general way, it may be difficult to guarantee the quality of the pile tip expansion base due to the slime penetration.

In addition, the expansion part can be prevented by installing the expansion wall support because the vacancy wall is easy to loosen or collapse, but the slime remaining on the bottom of the expansion part can adversely affect the bearing capacity and cause the subsidence of the foundation. Proper casting method is urgently needed.

Therefore, an object of the present invention in the construction of the expansion support to the pre-designed standard at the tip of the pile or tension member to improve the allowable bearing capacity of the pile or the pull-out resistance of the tension member in the construction related to the foundation or ground of the structure The present invention provides a method for adaptively placing a joint filler in the expanded expansion hole according to field conditions.

According to the above object, the present invention, in the method for forming the expansion portion in the drilling hole drilled in the depth of the ground for the construction of the enlarged portion fixed the construction member pile or tension member, and in the method of placing the joint filling material The lower part of the tip bottom of the member is equipped with a balloon embedded with a hardenable joint filling material, the pile or tension member is lowered to the bottom of the expansion portion, and the pile is pressed by pressing the pile or tension member, and the balloon is compressed upward and downward. It is a method of placing, characterized in that the expanded filling in the balun bonded radially expanded to the outside to be filled in the expansion while maintaining the specifications of the expansion.

It characterized in that the slime discharge port is formed in at least one of the core and the outer portion of the balun.

In addition, the balun may be provided with a central tube for forming a slime discharge port at the center of the balun and a balloon bottom support plate for supporting the bottom of the balun to discharge the slime remaining in the expansion portion.

It is characterized in that the front end portion and the filling material in the balun is connected to each other by the coupling member by hardening the bonding filler by connecting to the coupling member.

In addition, the method of forming the expansion portion in the drilling hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member for the construction of the present invention, and placing the joint filling material, the bottom of the tip bottom portion of the pile or tension member Install a balloon with a hardened joint filling material in the balloon, wherein the balloon is formed so that the horizontal and vertical expansion baluns are integrated in the vertical direction, lower the pile or the tension member to the bottom of the expansion portion, and then The vertical expansion balloon of the balun placed on the floor is compressed up and down, and the horizontal expansion balloon of the balloon expands radially to the outer part of the expansion part, so that the joint filling material in the balloon is filled in the expansion part while maintaining the specification of the expansion part. It is a casting method characterized by.

In addition, the present invention, in the method for forming the expansion portion in the drilled hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member and placing the joint filling material, the tip bottom of the pile or tension member An empty balloon is installed in the lower part of the part, and a pile or tension member is lowered to the bottom of the expansion part, and then a hardened joint filler is injected into the empty balloon to expand the balloon at the bottom of the expansion part radially to expand the balloon to the outer part of the expansion part. The inner filler filling material is characterized in that it is filled in the expansion while maintaining the specifications of the expansion.

In the present invention, by installing the observation equipment to the bottom of the balun to recover the state of the expansion can be observed.

In the present invention, the filling material in the balun is characterized by using a high-strength material having a compressive strength of 30 MPa to 300 MPa after 28 days of pouring, and on the balun with the high-strength bonding fill material, mortar or grout having lower structural performance than the bonding fill material is provided. It is characterized in that the expansion structure is formed in the expansion by finishing finishing with the joint filling material.

In the present invention, prior to lowering the pile or tension member to the perforation hole according to the site condition of the perforation part, an expansion ground support for supporting the expansion ground in the expansion hole of the drilling hole is selectively installed according to the state of the expansion ground layer. It features.

As another embodiment of the present invention, in the method of forming a expansion portion in the drilling hole drilled in the depth of the ground for the construction of the expansion portion in which the construction work pile or the tension member is stationary, and placing the joint filling material, the site of the expansion portion According to the condition, the process of selectively installing the expansion ground support for supporting the expansion ground in the expansion hole of the drilling hole, and after 28 days of placing the bottom portion of the expansion hole of the drilling hole high strength bonding to the compressive strength is 30MPa ~ 300MPa The process of pouring with filling material, the process of lowering the pile or tension member to the bottom of the expansion part with the coupling member installed at the bottom of the tip bottom part of the pile or tension member, and then placing it on the high-strength bonding filler material; Characterized in that it is made of a process of finishing finishing with a bonding filler material having a lower structural performance than the high strength bonding filler material on the high strength bonded filler material. The.

In another embodiment of the present invention, in the method for forming a expansion portion in the drilling hole drilled the ground in the depth direction for the construction of the expansion portion in which the construction work pile or the tension member is stationary, the casting filler According to the site condition, the process of selectively installing the expansion ground support for supporting the expansion ground in the expansion hole of the drilling hole, and after 28 days of placing the bottom portion of the expansion hole of the drilling hole, the compressive strength is 30MPa ~ 300MPa The process of placing with the filler filling material, the process of placing the reinforcing mesh for the field casting pile down to the bottom of the expansion part with the coupling member installed at the bottom of the distal bottom portion of the rebar mesh for the field casting pile; , The process of finishing the casting process with a bonding filler material having a lower structural performance than the bonding filler material on the high-strength bonded filler material placed in the expansion portion Shall be.

In another embodiment of the present invention, in the method for forming a expansion portion at the tip of the drilling hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member, the expansion wall With the expansion tool that can be maintained, the tip of the drilling hole is expanded and the upper base plate and the periphery of the expansion hole having a ceiling are supported to secure the previously designed expansion part standard, and between the expansion tool outer surface and the expansion ground surface. Fill in the gaps in the surrounding grounds by press-fitting the joint filler in the gap of the gap, and continuously press-in the joint filler in the voids created by gradually shrinking the expansion tools as the voids are filled to maintain the specifications of the expansion. It is characterized in that it is made of a process of fully filling the joint filling material in the expansion.

Bonding filler in the present invention is characterized by using at least one of grout, mortar, concrete.

The present invention forms a reliable expansion structure having a certain size and a certain strength at the tip of the underground drilling hole, so in the method of greatly improving the bearing capacity of the tip can effectively reinforce the inner portion and the surrounding ground of the expansion portion, so that the economic performance of the pile or anchor It can contribute greatly to improving the impact on the surrounding underground environment.

In particular, in the case of attaching the balun with high strength joint filler to the pile tip, the compressive strength as well as the flexural tensile strength and the adhesive strength are excellent after joining the pile filler. The same effect as that of a reinforcing steel sheet having a thickness of 1/3 to 1/5 of the thickness of the filling material may be applied. In this case, even a small balun thickness ensures stress transfer to the supporting ground, so that the height of the dilated part can be reduced, and the amount of rock drilling and the amount of soil to be treated are reduced. In addition, since the balun filled with high-strength bonding filler installed in the tip of the pile is applied, there is no phenomenon of inflow of foreign matter or aggregates from the filler, and the quality of the bonded filler in the ground can be ensured as in the ground. After the balun is installed, it is possible to apply high load to the pile from the ground before the joint filling material inside the balun solidifies, so that water or compressible slime in the remaining slime remaining on the floor is discharged to the upper part to prevent long-term settlement. The expanded bearing thickness (balloon thickness) of the pile is maintained to ensure structural safety.

And since most of the work is done on the ground and then installed at the front end, it is a very simple, economical and eco-friendly method that does not require installation and cleaning of the pouring hose or tremi tube.

1 to 8 are various embodiments of the method of pouring the joining filler to the perforated expansion to expand the bearing capacity of the pile or tension member of the present invention,

9 is a sectional perspective view of a balloon for pouring bonding filler;

FIG. 10 is a front sectional view of the balun for pour filling in FIG.

11 is another embodiment of the present invention for pouring the joint filling material without using a balloon;

Figure 12 is yet another embodiment of the construction procedure for placing the bonding filler in the expansion of the pile or tension member of the present invention without using a balloon.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 8, 11, and 12 are various embodiments of the method of pouring the bonding filler to the perforated expansion portion for expanding the bearing capacity of the pile or tension member of the present invention, the expansion of the pile or tension member for construction workers To show the various ways to form the expansion portion in the drilling hole drilled the ground in the depth direction for the sub-construction and to pour the bonding filler in accordance with the present invention.

It is to be understood that the "bonding filler" referred to in the present invention means a bonding material used when forming the foundation for construction in the pouring manner as concrete, mortar, grout or the like.

In the present invention, when the bonding filler is implemented at high strength in the present invention, a portion or all of the binders forming each of concrete, mortar, and grout may be replaced with a polymer having a polymer chemical structure to form a bonding filler (polymer bonding filler in this specification). Can be used).

The polymer concrete in the polymer bonded filler of the present invention may be polymer cement concrete (PCC), polymer concrete (PC: concrete), polymer impregnated concrete (PIC), or the like according to a manufacturing method. Polymer concrete exhibits high strength at early stages, which makes it possible to reduce the cross-section of the member, making it lighter, and having a nearly complete structure in terms of watertightness and airtightness, and thus have excellent resistance to absorption and permeability and resistance to gas permeation. .

In the present invention, the bonding filler material 12 is poured into the expansion part 22 of the punching hole 4, but the method of placing it using the balloon 26 (FIGS. 1 to 8) and the balloon 26 are not used. Both the methods of pouring (Figs. 11 and 12) are used. The joining filler material 12 placed in the expansion portion 22 of the drilling hole 4 is hardened to become an expansion structure for supporting the pile or the tension member. In the case of construction piles, the expansion structure is an enlarged support part formed at the tip to improve the bearing capacity of the pile, and in the case of the pile or anchor under tension, it is a fixed fixing part mainly formed at the tip part of the perforated hole to increase the pullout resistance. Significantly improved.

The expansion part 22 of the drilling hole 4 is formed in the ground support layer 2, such as a rock layer and the soil layer, Preferably it is located in the front-end | tip of the drilling hole 4. As shown in FIG.

First, the method of pouring the bonding filler material 12 into the expansion part 22 of the drilling hole 4 using the balloon 26 is demonstrated.

In the accompanying drawings, except for the pouring method of FIGS. 11 and 12, all use the filling material balun 26. 1 to 5, (a) shows an initial state in which the balloon 26 is inserted into the expansion portion 22 of the drilling hole 4, and (b) shows the balloon 26 in the pile or tension member 18. By pressing), the balloon 26 and the bonding material 12 filled in the balloon 26 are radially expanded from the bottom of the dilator 22.

The joining filler balun 26 is mounted to the bottom of the tip bottom portion 24 of the pile or tension member 18 through joining or fastening. The balloon 26 is used by using the same type of aramid fiber yarn used in parachute lines, body armor, or reinforcing fibers such as geotextiles as they are, or by weaving them to have wrinkles and bulky properties to extend in a radial direction. If necessary, it may be desirable to form the balloon 26 in the reinforcing fiber as a composite material in which a rubber layer capable of elastic expansion and contraction is formed as an inner skin.

The joint filling material balun 26 may be filled or filled with the joint filling material 12 therein, and the central slime outlet 38 is a passage through which the slime generated at the time of perforation or expansion may be discharged to the outside at the center when expanded. Is formed, the outer circumferential portion of the slime discharge port 40 of the groove shape is formed in an array.

The balloon 26 should have a surface area (volume) that can be deformed and can be in close contact with the outer sidewall of the dilator 22 when expanded. That is, as the balloon 26 is pressed on the pile or tension member 18 in the state of being positioned at the bottom of the dilator 22 by beating or continuous pressing, the height thereof decreases and radially expands at the same time. The expansion should have a surface area (volume) that can be in close contact with the outer wall of the expansion part 22 of the design specification.

After injecting the bonding material 12 into the balloon 26, the internal shape of the balloon is reduced to maintain the initial shape, or the initial shape is made of a string or a shell material such that the balloon can burst, break or peel off when the balloon is radially expanded. The shape should be made to have an initial reduced diameter that can sufficiently pass through the punching hole 4 by wrapping the balun with a retaining member.

A plurality of coupling members 28 are firmly coupled to the tip bottom portion 24 of the pile or tension member 18 between the tip bottom portion 24 and the bonding filler material 12 in the balun 26 when the bonding filler material 12 is hardened. Is extended downwards and positioned within the balloon 26, the coupling member 28 may also be used to limit the height of the reduction of the radially expanding balloon 26.

In the example of FIGS. 1 and 2, the initial height of the balloon 26 is formed to be within and outside the height of the expansion portion 22 when it is introduced through the drilling hole 4, and the bottom of the balloon 26 has a balloon bottom support plate ( 32 is optionally mounted.

In particular, in the case of Figure 2, unlike the central slime outlet 38 of the balun 26, unlike in Figure 1 in order to be better slime discharge is inserted into the center tube 36 is installed rigid.

In the example of FIG. 3, as shown in FIGS. 1 and 2, a method of initially filling the bonding filler 12 only in the balun 26 is not used. In FIG. 3, a part of the bonding filler material 12 is piled up at the outer end of the balloon 26, that is, the pile or tension member 18, and pressed by the bonding filler material consolidation plate 25 inserted into the tube. 26) The bonding filler material 12 in the upper portion is to be injected into the balloon 26 through the injection hole 24a formed in the tip bottom portion 24.

In the bonded filling material placing method shown in FIG. 4, the structure of the balloon 26 is somewhat different from that of FIG. 2. The balloon 26 of FIG. 4 has a structure in which the horizontally compressed balloon 26a and the vertically compressed balloon 26b are integrally formed up and down.

In the structure of the balloon 26 of FIG. 4, the pile or tension member 18 is lowered to the bottom of the enlarged portion 22 of the drilling hole 4 (see FIG. 4A), and the pile or tension member 18 is shown. When pressed, the vertical expansion balloon 26b of the balloon 26 placed on the bottom is first compressed in the vertical direction, and the bonding filler material 12 in the vertical expansion balloon 26b moves to the horizontal expansion balloon 26a. Accordingly, the horizontal expansion balloon 26a of the balloon 26 extends radially to the outside of the expansion portion 22 so that the bonding filler material 12 in the expansion balloon 26 maintains the specification of the expansion portion 22. Allow the bottom of 22 to be completely filled (see FIG. 4B).

In the balloon 26 of FIG. 4, the horizontal expansion balloon 26a is corrugated in the horizontal direction and the vertical expansion balloon 26b is corrugated in the vertical direction, and the vertical expansion balloon 26b is disposed below the horizontal expansion balloon 26a. It is better to be located in terms of the stability of the foundation. That is, when the coupling member 28 connecting the joint filling material 12 and the tip bottom portion 24 in the balloon 26 is formed above the vertical expansion balloon 26b, the wrinkles are unfolded. Since the bonding filler 12 is hardened because it can be bonded to each other more strongly.

When the expansion portion 22 is formed at the tip of the drilling hole 4 with the cutting bit sunk expansion tool, grooves may be naturally formed at the bottom of the expansion portion 22 as shown in FIG. The vertical expansion balloon 26b may be stored in a compressed state in the bottom recess of the study 22.

In FIG. 5, when grooves are formed in the bottom of the expansion part 22 of the drilling hole 4, the balloon bottom support block 34 and the support plate 32 are fixed to the bottom bottom of the balloon 26 in the structure as shown in FIG. 2. It shows an example of embossing as deep as the groove.

In the case of FIGS. 1 to 5, the expansion base is formed with the expansion tool 22 at the distal end of the drilling hole 4 and the upper base of the expansion part 22 is mounted at the distal end of the tubular casing 6. In the state supported by the support 20 in the state was described as an example, but Figure 6 is an exemplary view for explaining that it is possible even when there is no expansion ground support (20).

In addition, FIG. 6 shows a configuration in which the plate-shaped deformation preventing member 48 is hinged in a concentric arrangement to the outer bottom portion of the tip bottom portion 24 of the pile or the tension member 18.

Since the deformation preventing member 48 is a pile, it is folded vertically to the balloon 26 at the beginning of the tension member 18, and when the balloon 26 is extended radially, it spreads out as if the wings are unfolded and becomes horizontal. This is horizontally flattened as it is no longer bent, and the other bonding filler material 30, such as mortar, is additionally poured therein. Since the deformation preventing member 48 spreads the wings to support the horizontal state, the bonding filler 12 in the lower portion 22 prevents the occurrence of deformation due to the high load received from the upper portion.

Although the deformation preventing member 48 has been described as an example in the structure of FIG. 6, it should be understood that the strain preventing member 48 is also applicable to the structures of FIGS. 1 to 5 and 7 to 9.

When the expansion ground support 20 shown in FIG. 6 is not required, the ground support layer 2 in which the expansion portion 22 is formed is a fresh rock layer which does not have a fear of collapse when the expansion portion is formed.

In the case of Figure 7 shows an embodiment of the present invention is replaced with a reinforcing bar 42 for cast in place instead of using a ready-made pile or tension member 18 in the structure as shown in FIG.

It will be understood by those skilled in the art that the replacement of the reinforcing steel bar 42 for the cast-in-place pile may be similarly applied to the structures of FIGS. 1 and 3 to 5 as well.

8 is an example in which the empty balloon 26 is attached to the lower portion of the tip bottom portion 24 of the pile or the tension member 18. The empty balloon 26 is reduced at the same time as the pile or tension member 18 is pressed in the state where it is located at the bottom of the expansion portion 22 and expands radially. 22) It has a surface area that can be in close contact with the outer side wall.

As shown in (a) of FIG. 8, the empty balun 26 installed in the lower portion of the tip bottom portion 24 of the pile or the tension member 18 is lowered to the expansion part 22 of the drilling hole 4 and then the empty balun. Filling the bonding filler material 12 into the balloon 26 is completed by injecting the bonding filler material 12 that is curable in (26) through the feed tube 46. After the filling of the bonding filler material 12 is completed, the bonding filler material 12 is prevented from coming back up into the feeding tube 46 by using the valve means installed in the supply tube 46.

Thereafter, as shown in (b) of FIG. 8, the balloon 26 placed on the bottom of the dilation part 22 is pressed using a pile or a tension member 18, so that the balloon 26 and the bonding filler 12 therein are radially disposed. It is expanded and the joint filling material 12 in the balloon 26 and the balloon 26 to the bottom outside of the expansion portion 22 is filled. In this way, the lower portion of the expansion portion 22 is filled with the bonding material 12 of the balloon 26, and then the remaining portion of the expansion portion 22 is added as a separate bonding material such as mortar or grout 30. The filling of the joint filling material of the expansion part 22 is completed by pouring and filling.

9 and 10 are perspective cross-sectional and front cross-sectional views of the balloon 26 extending radially at the bottom of the expansion portion 22, and the filling material 12 is filled in the balloon 26. As shown in FIG.

9 and 10 show the configuration in which the tip bottom portion 24 of the pile or tension member 18 is formed of a bottom plate material made of steel, and the outside of the bottom plate material is formed by the joining portion 44 through a joining material or welding. The joint filling material 12 in the balloon 26 is directly connected to the bottom surface of the plate bottom of the tip bottom portion 24 by being connected to the joint filling balloon 26.

In this case, when the bonding filler 12 such as concrete is hardened, there is an effect of being firmly fixed to the bottom of the front bottom portion 24 that is steel as well as the coupling member 28.

According to the present invention, the joining filler material 12 that enters the balun 26 mounted on the lower portion of the tip bottom portion 24 of the pile or tension member 18 may be concrete, mortar, grout, or the like, and 28 days of pouring It is preferable to use a high strength material having a post-compressive strength of 30 MPa to 300 MPa, and more preferably to use a high strength material of 40 MPa to 200 MPa. The bonding filler 12 is preferably used as a polymer bonding filler for high strength.

After the bonding filler 12 made of high strength material is hardened in the balun as described above, it is very excellent not only in compressive strength but also in flexural tensile strength and adhesion strength, as if it is 1/3 to 1 / of the thickness of the filler filler 12 at the tip of the pile. 5 It has the same effect as the reinforcing steel sheet of thickness is attached. When such an effect is exerted, the thickness of the balloon 26 ensures stress transfer to the supporting ground, so that the height of the expansion portion 22 can be lowered, and the amount of rock drilling and the amount of soil to be treated can be reduced.

When applying the balun 26 filled with the high-strength bonding filler material 12 installed in the pile tip as in the present invention, the foreign matter enters the filler filler material 12 is covered by the balloon filler 26 is protected. Or aggregates are eliminated. Therefore, there is also an advantage that the quality of the joining filler material 12 placed in the expansion part 22 of the ground is secured as in the ground.

After the high strength bonding filler material 12 is poured into the distal end portion 22 of the drilling hole 4 using the balloon 26 as described above, before the bonding filler material 12 inside the balloon 26 is hardened. High loads can be applied to the pile from the ground so that water or compressible slime in the remaining slime remaining at the bottom of the expansion part 22 is discharged through the central slime outlet 38 or the side slime outlet 40 formed in the balun 26. Therefore, it is possible to prevent long-term settlement, and the structural stability can be ensured because the extended bearing thickness (balloon thickness) of the pile is maintained according to the designed dimensions.

More preferably, in the present invention, when the balloon 26 mounted on the lower portion of the tip reinforcement plate 24 of the pile or the tension member 18 is introduced into the expansion portion 22 through the drilling hole 4, the balloon ( Observation equipment shall be installed at the bottom of 26).

Therefore, whether the expansion part 22 is properly enlarged and punctured according to a previously designed standard and how much residual slime remains in the expansion part 22 can be known by photographing or measuring using the above-mentioned observation equipment, and enlarged puncture and slime discharged. If this is done properly, after recovering the observation equipment, it is to touch the bottom of the expansion portion 22 of the balloon 26.

After the balloon 26 is radially expanded and the high-strength bonded filler 12 is poured into the bottom portion of the tip expansion portion 22 of the drilled hole 4 in the balloon 26, the balloon 26 is placed on the balloon 26. Finishing the expansion of the expansion portion 22 by further placing the mortar or grout bonding filler material 30 of lower structural performance than the high-strength bonding filler material 12.

When the bonding filler material 12 is poured into the expansion portion 22 as described above, an expansion structure having a certain size and a certain strength is formed, and the bearing capacity of the tip portion is greatly improved.

Meanwhile, in FIG. 11, the bonding filler 12 is poured without using the balloon 26.

The method of placing the bonding filler material 12 in FIG. 11 without using the balloon 26 is for supporting the expansion ground in the expansion portion 22 of the drilling hole 4 according to the site condition of the expansion portion 22. The process of selectively installing the expansion ground support 20 and the bottom part of the expansion part 22 of the drilling hole 4 are poured into the high strength bonding filler 12 having a compressive strength of 30 MPa to 300 MPa after 28 days. And the pile or tension member 18 is lowered to the bottom of the expansion portion 22 while the coupling member 28 is installed at the bottom of the tip bottom portion 24 of the pile or tension member 18. The process of standing on the bonding filler material 12, and on the high-strength bonding filler material 12 placed in the expansion portion 22 to the bonded filler material 30, such as mortar or grout having a lower structural performance than the bonding filler material 12 This is done by the process of finishing casting.

FIG. 12 also shows another embodiment in which the bonding filler material 12 is directly poured without using the balloon 26 as in FIG. 11. In FIG. 12, in order to minimize the collapse of the expanding portion 22, a method of pouring the bonding filler 12 using the expanding tool is used.

12, it should be understood that the expansion ground support 20 shown in FIGS. 1 to 5 and 7 to 8 may be selectively used.

Referring to Figure 12, as shown in Figure 12 (a) to drill the ground and to install a tubular casing (6) in the drilling hole (4). Next, as shown in (b) of FIG. 12, the expansion tool 10, such as a drill or a water jet cutting machine, capable of expanding the wall, is positioned at the tip of the drilling hole 4, and then, as shown in FIG. As in c), the tip of the drilling hole 4 is drilled and expanded using the expansion tool 10 to form the expansion portion 22, and the slime generated by the cutting of the expansion tool 10 to the outside. Discharge.

The expansion tool 10 is preferably inclined in a conical shape on the upper side of the rotating body constituting the main body, which is useful for forming a ceiling shape that can reduce as much as possible the collapse of the upper base of the expansion portion 22 formed by expansion. .

12 (a) to (c) is also commonly applied to FIGS. 1 to 11, and the upper portion of the dilatation portion formed by using the dilation tool 10, that is, the ceiling portion is formed in a conical shape, and is inclined in a conical shape. As the ceiling has a ceiling, the joint filler 12, which is poured according to the embodiment of FIG. 12, is first injected from the outside of the expansion portion 22.

The dilatation tool 10 is more preferably a structure capable of cutting in the state of supporting the upper base of the dilation when cutting, when the ground position where the dilation is formed is a rock layer or a hard soil layer less likely to collapse when forming the dilation portion There is also an expansion tool structure that does not need to support the upper base.

In the embodiment of FIG. 12, after the expansion tool 22 is formed at the tip of the drilling hole 4 with the expansion tool 10, the expansion tool 10 is not reduced, that is, in the expanded state of the expansion tool 10. The high-strength joining filler material 12 is press-poured into the gap between the expansion ground surface and the expansion tool 10 in which the cutting operation is stopped, so that the outer dimensions of the expansion portion can be maintained as designed.

The above-mentioned "expansion ground surface" means any one or more of the ceiling of the expansion portion 22 and the expansion side wall inclined in the form of a cone, and the joint filling material into the gap between the expansion ground surface and the expansion tool 10 which has not yet been reduced. As the 12 is press-fitted, the joining filler 12 is filled from the outside of the expansion portion 22 formed at the tip of the drilling hole 4.

In order to facilitate press-fitting into the gap between the expansion tool 10 in the enlarged state and the expansion ground surface, an annular blocking plate can be installed on the connection table at the upper side of the expansion tool 10 so that it can be mounted and attached The filler 12 may be prevented from being pushed upwards to the punching hole 4.

In the periphery of the dilatation part 22, a void such as a hole or a gap may be generated. When the joint filling material 12 is pressed by a gap between the dilation tool 10 and the dilatation ground surface, as in the present invention, such voids are provided. It is possible to achieve the effect of filling all with the bonding filler (12).

Press-fitting method of the joint filling material 12 means both the gravity placing method using the pouring height and expandability, and the pressure placing method using a pump or a separate pressurizing device, which is filled in the expansion portion 22 according to the present invention Bonding filler material 12 is preferably used a high-strength material with a compressive strength of 30MPa ~ 300MPa after 28 days of pouring in order to secure a long-term allowable compressive load. The joining filler 12 may be used as one of grout, mortar, or concrete, or two or more materials as necessary.

Conventional grout material may not be used as a base for expansion of the expansion part 22 because of its low strength and because of cement dissolution, which is a factor of the bearing capacity of the pile or tension member.

However, in the present invention, the grout material may be used in the initial stage of press-pouring the joint filling material 12 into the gap between the ground tool 10 and the ground surface of the expansion part 22. Thus, when the grout material is initially used, the expansion tool 10 Injection through the gap between) and the ground of the expansion ground is very easy, and grout material is easily injected into the cracks or gaps of the ground around the expansion portion, so that the reinforcement of the expansion is done together with the strengthening of the ground. In this way, after filling the outer periphery of the expansion part with the grout material placement, the solidified concrete is poured into the expansion part of the drilling hole (4) to fill the joint. ).

As shown in (e) of FIG. 12, the joint filling material 12 is filled from the outside of the expansion part to maintain the specifications of the expansion part already secured, and gradually reduces the expansion tool 10, and the joint filling material 12 Pour it. In addition, when the expansion tool 10 is completely reduced, as shown in (f) of FIG. 12, the expansion filler 10 is fully charged and the bonding filler 12 is fully filled up to the depth of the expansion portion.

Upon completion of the casting of the joining filler material 12 in the above-described process, a reliable expansion structure 4 having a designed specification and a predetermined strength, that is, an expansion support part for a compression pile or an expansion fixing fixture for a tension member may be formed.

After recovering the expansion tool 10, as shown in (g) of FIG. Further, a reinforcing material 16 is preferably provided in the expanded structure 14 such as expanded concrete (or mortar, grout) formed in the expanding portion.

Various bonding filler material placing method of the present invention as described above can form a reliable expansion structure having a design according to the dimensions and the designed strength at the tip of the underground drilling hole can greatly improve the bearing capacity of the tip.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

Claims

In the method of forming the expansion part in the perforated hole which drilled the ground in the depth direction for the construction of the enlarged part which fixed the pile or tension member for construction work and placing the joint filler, it can be hardened in the lower part of the tip bottom of the pile or tension member. A balloon with a filler filling material is mounted, and the pile or tension member is lowered to the bottom of the dilator, and then the balun placed on the floor is pressed up and down by pressing the pile or tension member, and the balloon is extended radially to the outer circumference of the dilator. A method of placing a bonded filler material in the perforated expansion portion for expanding the bearing capacity of the pile or tension member, characterized in that the inner filler material is filled in the dilator while maintaining the dimensions of the dilator.
2. The method of claim 1, wherein a slime discharge port is formed in at least one of the core portion and the outer portion of the balun to increase the bearing capacity of the pile or tension member.
[4] The pile of claim 2, wherein the balun is provided with a center tube for forming a slime discharge port at the center of the balun and a balloon bottom support plate for supporting the bottom of the balun to discharge the slime remaining in the expansion portion. To pour perforated expansion joints in order to increase the bearing capacity of tension members.
The pile or tension member according to any one of claims 1 to 3, wherein the tip bottom portion and the in-balloon joint filler are connected to each other by a coupling member to fix the coupling member when the joint filler is hardened. How to pour the perforated expansion joint filler to increase the bearing capacity.
In the method of forming the expansion part in the drilling hole drilled the ground in the depth direction for the construction of the expansion portion fixed the construction member pile or tension member, and pouring the joint filler,
A balloon having a hardened joint filling material is installed in the lower portion of the tip bottom portion of the pile or tension member, and the balloon is formed such that the horizontal expansion balloon and the vertical expansion balloon are integrally formed in the vertical direction. After the member is lowered, the vertical expansion balloon of the balloon placed on the floor by pressing the pile or tension member is compressed up and down, and the horizontal expansion balloon of the balloon is radially extended to the outside of the expansion part. Method of pouring a joining filler to the perforation expansion to expand the bearing capacity of the pile or tension member, characterized in that the filling to the expansion portion while maintaining.
In the method of forming the expansion part in the drilling hole drilled the ground in the depth direction for the construction of the expansion portion fixed the construction member pile or tension member, and pouring the joint filler,
An empty balun is mounted under the tip bottom of the pile or tension member, and the empty balun is reduced radially at the same time as the pile or tension member is pressed in the state where it is located at the bottom of the expansion part and expands radially at the maximum expansion time. Formed to have a surface area that can be in close contact with the outer wall of the expansion part of the design specification, lower the pile or tension member to the expansion part, and press the pile or the tension member with the curable bonding filler in the empty balun to press the balloon height And at the same time, the balloon placed at the bottom of the dilator radially expands so that the joint filling material in the balun expanded to the outside of the dilator portion is filled in the lower portion of the dilator while maintaining the dimensions of the dilator portion. Supporting piles or tension members, characterized in that the remaining part is additionally poured by a separate joint filling material How to pour splice fillers in perforation extensions for increased intelligence.
The method of claim 1, 5 to 6, wherein the joining material in the perforated expansion portion for expanding the bearing capacity of the pile or tension member, characterized in that the observation equipment is installed to recover the bottom of the balun How to pour it.
The pile or tension member according to any one of claims 1 to 5, wherein a high-strength material having a compressive strength of 30 MPa to 300 MPa is used after 28 days of pouring the filling material in the balun. A method of placing a joint filler in the perforation extension to increase bearing capacity.
10. The method of claim 8, wherein the spun filling material is placed on the perforated expansion part to enlarge the bearing capacity of the pile or the tension member, characterized in that the finish is poured on the balun with the high-strength bonding material with mortar or grout.
The expansion ground according to any one of claims 1 to 5, wherein the expansion ground for supporting the expansion ground in the expansion hole of the drilling hole before the pile or the tension member is lowered into the drilling hole according to the site condition of the expansion hole. A method of placing a joint filler in the perforated expansion to expand the bearing capacity of the pile or tension member, characterized in that the support is selectively installed.
The method according to any one of claims 1, 5 to 6, wherein the joining filler material is used as one or more of grout, mortar, concrete, bonded to the perforated expansion portion for expanding the bearing capacity of the pile or tension member How to pour fillers.
The method of claim 1, wherein the joining filler is a polymer joining filler, wherein the joining filler is poured into the perforated expansion part to increase the bearing capacity of the pile or tension member.
The method according to any one of claims 1 and 5 to 6, wherein the plate-shaped deformation preventing member is hinged to the outer bottom of the tip bottom portion of the pile or the tension member in a concentric manner so that the balun is unfolded and horizontally expanded. A method of placing a joining filler in the perforated expansion to expand the bearing capacity of the pile or tension member characterized in that it is supported.
In the pouring apparatus for the construction of the joining filler material after forming the expansion part in the drilling hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member,
In the lower part of the tip bottom portion of the pile or tension member is embedded a hardened high-strength bonding filler material and is formed so that the balun for bonding filler material having a surface area that can be modified in shape and reach the outer portion of the expansion portion is mounted, and the core of the balun Bonding filler placing device, characterized in that configured to form a slime discharge hole selectively in one or more of the outer portion.
In the pouring apparatus for the construction of the joining filler material after forming the expansion part in the drilling hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member,
In the lower part of the tip bottom portion of the pile or tension member is embedded a hardened high-strength bonding filler material and is formed so that the balun for bonding filler material having a surface area that can be modified in shape and reach the outer portion of the expansion portion is mounted, and the core of the balun A slime discharge hole is selectively formed in at least one of the outer parts, and a joint filler material injection hole is formed in the tip bottom part, and a joint filler material is consolidated and inserted into the tube by accumulating a part of the filler filler material at the tip of the pile or tension member. Bonding material placing device, characterized in that configured to be injected into the balloon through the injection hole of a portion of the filling material in the tube by the pressure by the plate.
In the pouring apparatus for the construction of the joining filler material after forming the expansion part in the drilling hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member,
In the lower part of the tip or bottom portion of the pile or tension member is embedded a hardened high-strength bonding filler material and is configured to be fitted with a balloon for bonding filler material having a surface area that can be deformed and reach the outside of the expansion portion, the balloon is horizontal Bonding material placing device is characterized in that the balloon and the vertical expansion balloon is formed integrally in the vertical direction, and at least one of the core portion and the outer portion of the balloon is formed with a slime discharge hole selectively formed.
In the pouring apparatus for the construction of joining filler material after forming the expansion part in the drilling hole drilled the ground in the depth direction for the construction of the enlarged portion of the construction work pile or tension member,
The hollow balun for bonding filler is mounted on the lower part of the tip bottom of the pile or tension member, and the hollow balun can be filled with a hardened high strength bonded filler and can be deformed and its height as the pile or tension member is pressed. And at the same time expand radially and have a surface area that can be in close contact with the outer wall of the expansion part of the design specification at the maximum expansion, and at least one of the core and the outer part of the balun is applied to a pile or tension member on the ground. As the balun containing the joint filling material is pressed, the remaining slime remaining at the bottom of the expansion part is discharged to prevent long-term settlement. And a supply tube for selectively forming a slime discharge hole and being connected to the empty balun to supply a joint filling material into the empty balun.
18. The joining filler material according to any one of claims 14 to 17, wherein the tip bottom portion is formed of a sheet material and the outer edge of the bottom sheet is connected to the joining balloon balun through joining so that the joining filler material in the balun is connected to the bottom surface of the sheet bottom portion of the tip bottom portion. Bonding filling material placing apparatus characterized in that the direct contact is configured.
The apparatus of claim 14, wherein the support block filling the recess formed in the bottom of the dilator is expanded to the bottom surface of the balun.
18. The bonding filler placing device according to any one of claims 14 to 17, wherein the bonding filler is a polymer bonding filler.