KR20230156272A - Spiral Bolt For Ground Reinforcement - Google Patents

Abstract

In order to reinforce and strengthen the bearing capacity of the ground, there is a known method of inserting spiral bolts and piles for ground reinforcement and then additionally injecting mortar. That is, in the case of rocky ground, such as ground containing a rock layer or a large gravel layer, the rocky ground is excavated using an excavator, a pile for ground reinforcement is inserted into the excavation hole, and then mortar is poured.
Here, in the case of soft ground such as fill ground containing gravel or insufficient compaction rather than hard ground such as sand or clay, the bearing capacity may be insufficient with simple ground reinforcement piles. At this time, in order to stably fix the pillars of the post structure, the post structure can be stably fixed to the ground by using bolts, underground anchors, and double and triple spiral structure ground reinforcement piles (Spiral Bolt) provided with twisted flat iron. there is.

Description

Pile for ground reinforcement {Spiral Bolt For Ground Reinforcement}

The present invention relates to a reinforcing pile (spiral bolt) to increase the bearing capacity of soft ground. More specifically, it is necessary for the soft ground reinforcement method used when fixing and installing post structures used in civil construction facilities, steel structures, lighting towers, standing signs, natural power generation equipment facilities (wind power generators, solar power generators), etc. on soft ground. This relates to piles for ground reinforcement, and is about a configuration for smartly and highly efficiently injecting mortar by installing a tube in the pile for ground reinforcement.

In order to strengthen the bearing capacity of the ground and reinforce it, there is a known method of inserting ground reinforcement piles and then injecting additional mortar. That is, in the case of rocky ground, such as ground containing a rock layer or a large gravel layer, the rocky ground is excavated using an excavator, a pile for ground reinforcement is inserted into the excavation hole, and then mortar is poured. Here, in the case of soft ground such as fill ground containing gravel or insufficient compaction rather than hard ground such as sand or clay, the bearing capacity may be insufficient with simple ground reinforcement piles. At this time, in order to stably fix the pillars of the post structure, the post structure can be stably fixed to the ground by using bolts, underground anchors, and double and triple spiral structure ground reinforcement piles (Spiral Bolt) provided with twisted flat iron. there is.

In the prior art, reference is made to related patent publication No. 7943 (2016) as shown in FIGS. 1 and 2. Looking specifically, the ground reinforcement pile 100 includes a fuselage 110 and spiral wings 120 extending vertically downward from the bottom of the fuselage 110. The fuselage 110 has a cylindrical shape with a through hole 114 inside, and a mounting plate 112 is provided at the top. The mounting plate 112 is intended to be coupled to the flange portion 20 provided at the bottom of the post structure 10, and a plurality of bolt grooves 116 are provided in the circumferential direction for bolt connection. The spiral wing 120 has a structure in which a plurality of unit spiral parts 122 are repeated to increase ground bearing capacity. The spiral wing 120 is formed by twisting the central part of the flat iron, which is the base material, at a certain angle with respect to the central axis in the longitudinal direction to a certain length, so that the unit spiral part is continuous.

The tube 130 is inserted into the through hole 114 of the fuselage 110, passes through the through hole 114, and then is installed to extend to the bottom of the spiral wing 120. A hole penetrates the inside of the tube 130, and mortar is injected into the ground through this hole. The tube 130 may be made of a soft synthetic resin material. The tube 130 is fixed to contact the spiral wing 120, that is, the unit spiral portion 122, by a plurality of fixing parts 140, and the tube 130 is fixed by an appropriate number of fixing parts 140. It is fixed without being separated from the spiral wing (120). The fixing part 140 is usually applied with an adhesive material to fix the tube 130 to the surface of the unit spiral part 122, or the tube 130 is fixed to the unit spiral part 122 through another type of fixing member. ) can be fixed to the surface. In the soft ground reinforcement method using the ground reinforcement pile 100 having this configuration, first, once the location where the post structure 10 is installed is determined, the ground reinforcement pile 100 is installed in the soft ground 150 at that location. ) is inserted (S210).

Mortar is injected into the tube 130 of the ground reinforcement pile 100 so that the mortar is injected into the ground (S220). As shown, when the ground reinforcement pile 100 is inserted, a portion of the upper part of the body 110 of the ground reinforcement pile 100 is exposed to the ground, and the upper end of the tube 130 protrudes from the upper part of the body 110. And mortar is injected from the top of this tube 130. Since the hole in the tube 130 is relatively small, mortar is injected into the tube 130 using a pressurizing device (not shown). When mortar is injected in this way, mortar 160 comes out from the bottom of the tube 130 in the ground, and the mortar permeates into the soft ground 150 with many gaps. Once mortar injection is completed, the post structure 10 and the ground reinforcement pile 100 are coupled (fixed) with bolts, etc. In this way, a tube can be installed on the ground reinforcement pile and mortar can be injected into the soft ground through this, so the bearing capacity of the soft ground can be strengthened, and ultimately, the post structure can be stably fixed and installed in the soft ground in an easy and quick manner. You can.

Inserting the ground reinforcement pile 100 into soft ground while exposing a portion of the upper part of the body 110 of the ground reinforcement pile to the ground; Injecting mortar from the top of the tube 130 exposed at the top of the fuselage 110, causing the mortar to come out from the bottom of the tube 130, and injecting the mortar into soft ground; A step of coupling and fixing the post structure to the ground reinforcement pile (100); It is done based on the soft ground reinforcement method using ground reinforcement piles.

The ground reinforcement pile 100 includes a body 110 having a through hole 114 therein and a mounting plate 112 coupled to the post structure 10 at the top; Spiral wings 120 extending downward from the bottom of the fuselage 110 and having a plurality of unit spiral parts 122 to increase the bearing capacity of the ground; A tube 130 installed through the fixing part 140 to be inserted into the through hole 114 of the fuselage 110, pass through the through hole 114, and then extend to the bottom of the spiral wing 120; It is done including. The fixing part 140 is divided into a lower fixing part 141 that fixes the bottom of the tube 130 and a body fixing part 142 that fixes the body of the tube 130. There are at least two body fixing parts 142, including the first body fixing part 142 (142-1); Second body fixing part 142 (142-2); It is exemplified as a plurality of two or more provided as the third body fixing part 142 (142-3).

In the case of soft ground, the ground reinforcement pile is rotated and inserted into the ground without drilling a separate excavation hole, so mortar cannot be easily injected. Therefore, after inserting the ground reinforcement pile into soft ground, mortar is added to the ground reinforcement pile. Ground reinforcement piles with tubes are needed so that the ground can be reinforced evenly around the body.

The pile for ground reinforcement with enhanced bearing capacity of the present invention includes spiral wings inserted into the ground; A tube attached to the spiral blade and through which mortar moves; It includes a lower fixing part provided at the bottom of the tube to inject mortar into the ground through an external injection port,

The inner periphery of the lower fixing part takes the shape of a cylinder, and a piston of a corresponding shape is mounted thereon,

A cut groove is formed in the shape of an H on the surface of the spiral wing so that mortar can be introduced into the opposite side of the spiral wing to which the lower fixing part is attached,

The upper body of the upper part formed by cutting the incision groove is bent upward, and conversely, the lower body of the lower part is bent downward to provide an integrated mortar outflow and tube fixing bracket, and the incision groove is formed by laser cutting. ,

The upper body, which is the upper part of the integrated mortar discharge and tube fixing bracket, has a hole drilled into it and is provided as a tube fixing groove, so that the tube is inserted and fixed into the tube fixing groove, and the tube fixing groove is formed by laser cutting.

After inserting the bearing capacity reinforcement pile into the ground of soft ground, mortar is evenly spread around the body of the ground reinforcement pile to reinforce the ground, and the mortar is also applied to the opposite side where the lower fixing part (141) of the spiral wing (120) is attached. can be input.

Figures 1 and 2 are front views showing a ground reinforcement pile and its accompanying configuration, and an example diagram showing the state in which the ground reinforcement pile is constructed on soft ground and a block diagram of the construction method.
In Figure 3, Figure 3A is an enlarged cross-sectional view of a portion of the pile configuration for ground reinforcement; Figure 3B is an exemplary diagram showing an operating state; Figures 3C and 3D are cross-sectional perspective views of another embodiment showing its construction and operation.
Figure 4 shows one embodiment of the present invention.
Figures 5 to 8 show another embodiment.

We will look further into the conventional pile for reinforcing soft ground through the embodiment of Figure 3. It has a fuselage having a through hole inside and a mounting plate coupled to the post structure at the top, and a spiral wing 120 extending downward from the bottom of the fuselage, which is inserted into the through hole of the fuselage and passes through the through hole. It includes a tube 130 that is installed to extend to the bottom of the spiral wing 120, and is provided with a fixing part 140 that is attached to the spiral wing 120 when installing the tube, so that the tube is attached to the spiral wing 120. To ensure that it is firmly attached, when mortar is injected from the top of the tube, the mortar moves down along the tube and is injected into the soft ground from the bottom of the tube.

The lower end of the tube 130 has a tube bottom outlet 130a through which mortar is discharged, and the fixing part includes a cylindrical lower fixing part 141 for fixing the lower end of the tube, and the upper end of the lower fixing part 141 is the lower part of the tube. A tube lower fixing inlet (141e) is formed having an inner periphery corresponding to the outer periphery of the outlet (130a), the lower end (141d) of the lower fixing part (141) is blocked, and the body periphery of the lower fixing part (141) is formed. The perforated opening is partially formed and used as the external inlet (141a) of the lower fixing part (141). The inner periphery of the lower fixing part 141 takes a cylindrical shape, and correspondingly, a piston 141c which takes a cylindrical shape vertically up and down is mounted, and the outer periphery of the piston 141c is that of the lower fixing part 141. It goes up and down by sliding while in close contact with the inner surroundings, and normally closes the external inlet (141a) of the lower fixing part (141), so that the vertical length of the piston (141c) is outside of the lower fixing part (141). It is taken to be longer than the vertical length of the injection port 141a, and the lower space 141b of the lower fixing part 141 has a vertical length so that it can completely accommodate the piston 141c when it descends and reaches the lowest point position. When mortar is injected from the tube bottom outlet 130a into the interior of the lower fixing part 141 by taking it larger than the vertical length of the piston 141c, the pressure first lowers the piston 141c, and accordingly, the lower end height The external injection port 141a of the top 141 is opened to the outside and mortar is injected into the soft ground.

The tube is fixed to the spiral wing 120 through a plurality of body fixing parts 142, and the tube 130 is provided with the middle and middle of the body separated, and the body fixing part 142 is in the form of a pipe with an empty interior. By taking, each separate entrance of the tube 130 is configured to be fixed to each of the upper and lower entrances of the body fixing part 142, and the body fixing part ( 142) is provided with an external inlet 141a of the body fixing part 142, which is formed by opening a certain portion around the body, and the external inlet 141a of the body fixing part 142 is a blocking film that is normally kept in a blocked state. It is provided with (142a`), and the barrier film (142a`) is selected as a member that can be destroyed when the load pressure exceeds the set before construction, so that the external inlet (141a) of the lower fixing part (141) is opened and the mortar is externally weak. When the mortar is injected (m4) into the ground, the mortar flows smoothly downward, reaches the external injection port (141a) of the lower fixing part (141), and flows out. Afterwards, when the soft ground on the side of the lower fixing part 141 is compacted and the mortar can no longer escape, the internal pressure of the tube 130 increases, and accordingly, the internal pressure is applied to the blocking film 142a'. It operates on the principle that the barrier film (142a') is destroyed and the external inlet (141a) of the body fixing part (142) is opened and mortar is injected into the soft ground around it. The plurality of body fixing units 142 include the first body fixing unit 142 (142-1); Second body fixing part 142 (142-2); and a third body fixing part 142 (142-3), each of which includes an external inlet 141a and a blocking film 142a' of the body fixing part 142, and each blocking film 142a is sequentially provided. The rupture strength of `) is set differently, so that the external inlet 141a of the body fixing part 142 is sequentially opened in such a way that the barrier film 142a` ruptures from the bottom to the top, gradually starting from deep in the ground. It is designed to compact and reinforce soft ground by injecting mortar into the shallow area. Through this, the area where mortar is injected into the soft ground is prevented from clogging, allowing mortar to be smoothly injected into the soft ground.

However, according to the ground reinforcement pile (spiral bolt) for reinforcing soft ground according to the conventional embodiment of FIG. 3, when mortar is injected into the surrounding soft ground, the bottom is moved by the spiral wing 120, that is, the unit spiral portion 122. Since one side of the external injection port 141a of the fixing part 141 is blocked, it is not easy to spray mortar in that direction. In order to improve this, we will now look at the attached drawings to learn more about smarter ground reinforcement piles for soft ground reinforcement. The bearing capacity reinforcement pile of the present invention is composed of a means 100 that allows mortar to be sprayed (s2) on the lower side of the spiral wing 120 in the opposite direction to the side where the lower fixing part 141 of the tube 130 is attached. do. In the present invention, all grooves or cutting grooves can be formed through laser cutting or press processing.

As in the embodiment of FIG. 4, a mortar outflow hole (h110) is formed by making a groove (drilling a hole) on the lower side of the spiral wing 120 with the mortar spraying means 100 on the side opposite to the attachment of the tube 130. This can be achieved. Through this, the mortar is configured to pass through the mortar outflow hole (h100) and be sprayed (s2) on the side opposite to where the tube 130 is attached. Figure 4A is an exploded view of the spiral wing 120 and the tube 130 with the mortar outflow hole (h100), Figure 4B is a combined view, and Figure 4C is an exploded view of this side of the spiral wing 120 ( s1) This illustrates a state in which mortar is sprayed to the other side (s2), that is, the mortar is sprayed to both the side to which the tube 130 is attached and the opposite side to which the tube 130 is attached.

5 to 8 are more advanced, in which a mortar outflow and tube fixing bracket 120 integrated with a spiral wing 120 is formed as a means 100 for spraying mortar to the opposite side of the tube 130. A mortar outflow hole (h0) (can be replaced with 'mortar outflow groove' to distinguish it from the one in the embodiment of Figure 4 A) is formed (perforated) at the same time in an integrated manner. Looking in more detail, in Figure 5, the incision grooves (h1, h2) cut (cut) in an H shape on the surface of the spiral wing 120 are dented, so that the spiral wing 120 can be separated or removed from the body. Therefore, as shown in Figure 6, the non-cut portions (h3) that are not cut at the top and bottom can be bent (bended, bent, bent) at right angles (or acute or obtuse angles) up and down, respectively, around the bending axis. In this way, an integrated mortar outflow and tube fixing bracket 120 is formed. The drawing on the right in FIG. 6 shows a bent state from the side, and the bar shown in the oval box below FIG. 6 is an example to aid understanding.

And on the upper body of the bracket (h122), which is the upper part of the body of the integrated mortar outflow and tube fixing bracket (120) cut in an H shape, a groove (hole) corresponding to the outer periphery (outer shape) of the tube (130) is hollowed out (perforated). ) Provided with a tube fixing groove (h121). As shown in Figure 7, the tube 130 can be inserted (interposed) into the tube fixing groove (h121) and fixed very firmly. In addition, the tube fixing groove (h121) can be formed by adding it to the bracket lower body (h123), which is the lower part of the body cut in the shape of H, and then fixed more firmly by interposing a predetermined portion of the bottom of the tube 130. Mortar is sprayed (flowed, discharged) through the mortar outlet hole (h0).

As shown above, in Figures 6 and 7, the upper body (h122) of the upper part, which is formed by cutting the H-shaped cut grooves (h1, h2), is bent upward and at a right angle, and the lower body (h123) of the lower part is downward and bent at a right angle. Bend to form an integrated mortar drain and tube fixing bracket (120). Meanwhile, in the embodiment of FIG. 8, the lower body (h123) is bent (bent) downward at an acute angle of a predetermined angle (r1) that is less than a right angle, so that the opposite side becomes an obtuse angle (r1 < r2). Through this, in particular, when the bottom fixing part 141 at the bottom of the tube 130 penetrates the ground along the spiral wing 120 and descends into the ground, it receives less resistance from the soil and reduces the amount of friction.

Bottom fixing part (141); External inlet (141a) of the lower fixing part (141); Tube bottom fixed entrance (141e); post structure (10); Flange portion (20); Pile for ground reinforcement (100); Spiral wings (120); tube 130; Fixing part 140;

Claims (1)

In the ground reinforcement pile with enhanced bearing capacity,
Spiral wings inserted into the ground; A tube attached to the spiral blade and through which mortar moves; It includes a lower fixing part provided at the bottom of the tube to inject mortar into the ground through an external injection port,
The inner periphery of the lower fixing part takes the shape of a cylinder, and a piston of a corresponding shape is mounted thereon,
A cut groove is formed in the shape of an H on the surface of the spiral wing so that mortar can be introduced into the opposite side of the spiral wing to which the lower fixing part is attached,
The upper body of the upper part formed by cutting the incision groove is bent upward, and conversely, the lower body of the lower part is bent downward to provide an integrated mortar outflow and tube fixing bracket, and the incision groove is formed by laser cutting. ,
The upper body, which is the upper part of the integrated mortar discharge and tube fixing bracket, is provided with a hole and a tube fixing groove, so that the tube is inserted and fixed into the tube fixing groove, and the tube fixing groove is formed by laser cutting,
The lower body is bent downward and bent at a right angle,
Pile for ground reinforcement.