KR100793510B1 - Tension soil nail and construction method of underground wall using the same - Google Patents

Abstract

A tension soil nail and a construction method of an underground wall using the same are provided to simplify excavation work and to minimize an interval between underground walls by building the underground continual walls vertically and repeating process of constructing the tension soil nail. A tension soil nail comprises a lower fixed member(120) and an upper fixed member(130) by nuts, and includes steel wires(150) for tensile force from the upper fixed member to the lower fixed member. The upper fixed member has a front bearing force plate(131) having a rectangular hole(131), a plate-shaped mounting body(133) having wedge holes(135), and wedges(136) inserted in the wedge holes to hold the steel wires. The lower fixed member has a female screw(121) and a steel wire through hole(122). A grouting material injection hole(123) is formed at the center of the lower fixed member.

Description

Tension Soil Nail and Construction Method of Underground Wall Using It {TENSION SOIL NAIL AND CONSTRUCTION METHOD OF UNDERGROUND WALL USING THE SAME}

1 is a cross-sectional view showing a state of construction of an underground wall to which a conventional small nail is applied,

2a to 2f is a process diagram showing the construction process for the basement wall of FIG.

3 is a view showing a ground displacement state when vertical excavation by applying the existing small nail as shown in FIG.

Figure 4 is an exploded perspective view showing a tension thumbnail of an embodiment according to the present invention,

5 is an assembly cross-sectional view of FIG.

6 is an exploded perspective view showing a tension thumbnail of another embodiment according to the present invention,

7 is an assembly cross-sectional view of FIG.

8 is a cross-sectional view of an underground wall constructed using the tension nail of the present invention,

9A to 9F are process diagrams illustrating a process of constructing an underground continuous wall in FIG. 8;

10a is a plan view of a state in which the underground continuous wall is completed in accordance with the present invention,

FIG. 10B is a front view of a state viewed from the inside of FIG. 10A.

<Description of the symbols for the main parts of the drawings>

100: tension thumbnail 110: pipe

120: lower fixing member 121: female thread

122: steel wire through hole 123: grouting injection hole

130: upper fixing member 131: front pressure plate

132: rectangular hole 133: fixing body

134: pipe hole 135: wedge hole

136: wedge 140: nut

150: liner 151: shell

160: spacing member 200: outer wall

220: underground wall

The present invention relates to a tension soil nail and a method for constructing a continuous wall using the same, and more particularly, to construct a continuous wall in the shape of the construction of the wall of the building in plan view and excavate the inner side of the underground continuous wall However, the process of constructing the tension sole nail to be inclined downward on the underground continuous wall exhibited by this excavation is repeated several times, and then adopts the method of constructing the underground wall which is the main body of the building inside the underground continuous wall. The present invention relates to a tension soil nail which can be reinforced with ground around a continuous underground wall and reduce the thickness of the underground wall of a building body, and a construction method of an underground continuous wall using the same.

In general, various construction methods for the underground continuous wall are known. Among them, underground walls are constructed inside of them after excavation, ie, destruction at a predetermined depth while reinforcing the ground using nails (reinforcement materials).

As shown in FIG. 1, the primary shotcrete 11 is poured into the excavation side wall 10 excavated downward from the ground, and the primary shotcrete 11 is constructed as an existing underground nail using the existing small nail. Secondary shotcrete 12 is poured again after the small nail 13 is inserted and constructed to be inclined downwardly, and an underground wall 14, which is a main body of the building, is placed inside the spaced to some extent from the secondary shotcrete 12. In the space between the secondary shotcrete 12 and the subterranean wall 14, a back filling portion 15 backfilled with cement mortar is provided. The small nail 13 uses a steel pipe or a release steel bar.

In the existing underground wall structure as described above, the thickness of the primary and secondary shotcrete (11, 12) is a ', the thickness of the backfill portion 15 is b', the thickness of the underground wall 14 is c ' Indicated as.

As described above, the construction process of the continuous continuous wall to be constructed by using a small nail (reinforcement material) will be listed in detail. First, the excavation side wall 10 is excavated to have a depth of about 1.5 to 3M by using a fork lane 21, which is one of the excavating equipments as shown in FIG. 2A, and excavation to the surface of the excavation side wall 10 as shown in FIG. 2B. In order to prevent the side wall 10 from collapsing, the first shotcrete 11 is poured by a predetermined thickness and cured, and then the hole for installing the nailnail is inclined downwardly using the perforator 22 as shown in FIG. The drilling hole 23 is drilled.

Thereafter, as shown in FIG. 2D, the nail nail (reinforcement material) 13 is inserted into the drilling hole 23, and then cement grout or cement mortar is injected and grouted, and the second shotcrete 12 is poured as shown in FIG. 2E. After curing, it is further excavated to have the excavation side wall 10 to a depth of about 1.5 ~ 3M, as shown in Figure 2f, and then repeats the process as shown in Figure 2b to Figure 2e several times from a later step is an irregular surface The excavation work in the state which has a vertical digging side wall 10 is completed. At this time, the insertion depth of the small nail 13 should be installed to the area of passive earth pressure beyond the virtual destruction line so that the area of the main earth pressure does not move along the break line.

In the case of vertical excavation while stabilizing the soil by constructing the small nails 13 at predetermined depths in the order of FIGS. 2A to 2F as described above, as shown in FIG. When excavation is carried out to have the excavation side wall 10, the horizontal displacement δh, which is deformed inwardly when the upper portion of the excavation side wall 10 is deformed, and the vertical displacement δv, which is settled corresponding to the horizontal displacement δh, It is known that a horizontal displacement δO is generated even at a rear surface position which is easy to be generated and is separated by a predetermined distance L1 from the excavation side wall 10 on which the trench is formed.

As described above, after completion of the excavation work (vertical excavation) to a predetermined depth, the reinforcement work and the formwork is installed in the inner position of the excavation side wall 10, the concrete is poured into the formwork and cured, Dismantle and finish the construction of the underground wall by placing concrete mortar in the back filling part 15, which is a space between the second shotcrete 12 and the underground wall 14 of the excavation side wall 10, and performing the back filling operation. .

However, in the existing method of constructing and constructing an underground wall after digging using a small nail as described above, the primary and secondary shotcretes (11, 12) are simply cast on the excavation side wall (10), and the strength thereof. Is inevitably weak, because of this, due to the impact or vibration when drilling with the punching machine 22 for the construction of the small nail (13) was likely to cause local cracks or breakage, such as local cracks or falling on the excavation side wall (10).

In addition, the small nail 13 is inserted and grouted into the drilled hole 23 in the excavated side wall 10 which has been vertically excavated, that is, stabilizing the soil by using the small nail, or because it is soft ground, Displacement problems, ie, a horizontal displacement δh and a vertical displacement δv, are generated such that the upper part of the excavation side wall 10 that has been excavated at the depth H is easily broken.

In addition, since the excavation side wall 10 is excavated by using excavation equipment such as a fork lane 21 in the conventional excavation work, there is no choice but to excavate an irregular curved surface and install and demolish the formwork for the construction of the underground wall 14 here. Since the space to be secured must be secured, the backfill space must be widened. As a result, a large backfill space between the secondary shotcrete 12 and the underground wall 14 must be filled with cement mortar. Therefore, excessive consumption of construction materials and construction costs are increased. There was a problem.

In particular, the small nail 13 is inserted into the excavation side wall 10 on which the primary shotcrete 11 is poured, and the secondary shotcrete 12 is poured on the surface of the primary shotcrete 11 again. Since it is structurally incapable of having strength as a wall, it cannot be used as an underground wall 14, and since the back filling portion 15 is wide, the first and second shotcretes 11 and 12 and the back filling portion 15 are wide. ) And the base wall 14 has to be thick, which in turn has a problem that the building area is reduced.

The present invention has been researched and developed in order to solve the above-mentioned conventional problems, the object is to construct a continuous underground wall in the shape to intend the construction of the wall of the building when viewed in plan, and excavate the inner side of the underground continuous wall By repeating the process of constructing the tension sole nail down to the underground continuous wall exhibited by this excavation several times, and then adopting the method of constructing the underground wall which is the main body of the building inside the underground continuous wall. As well as the underground continuous wall by the nail, the surrounding ground is reinforced, and the underground continuous wall can be used as the underground wall of the building body, thereby reducing the thickness of the entire underground wall of the building body. Tension Soil Nails to Increase Construction Area and Construction Method of Underground Continuous Wall Using the Same To provide.

In addition, the present invention, unlike the existing construction method of the construction of the existing underground wall to install the first and second shotcrete on the excavation side wall, and install the nail nail, after constructing the underground continuous wall vertically and excavating the inside of the tension soil nail Since the process is repeated several times, the excavation work is simplified and construction is easy, and the excavation side wall is vertical and the side wall surface is relatively flat, so that the gap between the underground walls built inside is minimized, thereby The present invention is to provide a tension sole nail and construction method of underground continuous wall using the same to reduce construction materials and reduce working time.

The present invention for achieving the above object is the lower fixing member is fixed to one end of the nail (reinforcement) and the upper fixing member is fastened and installed by the nut on the other end of the tension from the upper fixing member to the lower fixing member In the tension sole nail including a steel wire connected to provide a connection, when the nail is used as a pipe, the tension can be imparted by selectively passing the steel wire inside or outside the pipe according to the construction conditions or design. It is done. In this case, the steel wire is covered with an outer sheath, and the outer skin of the steel wire should be allowed to flow in the axial direction when the steel wire is tensioned and extended.

In the tension nail of the present invention, the lower fixing member is provided with a cap type formed with a grouting material injection hole in the center while a steel thread through hole is formed so that a female thread for fastening with an outer surface of the pipe end is formed and a steel wire penetrates into or out of the pipe. This is preferred.

In the tension nail of the present invention, the upper fixing member in the case where the steel wire is provided to the outside of the pipe, the front pressure plate formed with a rectangular hole so that at least one adjacent pipe passes therethrough, and is provided in contact with the front pressure plate to It consists of a plate-shaped fixing body having a wedge hole in which the steel wire is provided on the outside, and a wedge inserted into the wedge hole of the fixing body to grip the steel wire.

In the tension nail of the present invention, the upper fixing member when the steel wire penetrates into the inside of the pipe includes a front pressure plate formed with a rectangular hole so that at least one adjacent pipe passes therethrough, and is provided in contact with the front pressure plate. It consists of a fixing body having a wedge hole formed in a cap shape to cover the end of the end and the nut is fastened to the inside of the pipe, and a wedge inserted into the wedge hole of the fixing body to grip the steel wire.

In the tension sole nail of the present invention, the steel wire is returned from the upper fixing member to the upper fixing member through the lower fixing member at the end of the pipe to fix both ends of the steel wire in the upper fixing member, or using two strands of steel wire. The steel wire ends can be fixed to the upper fixing member and the lower fixing member, respectively.

In addition, according to the present invention, a method of constructing a continuous underground wall using a tension sole nail is a first step of constructing an underground continuous wall in a shape intended to construct an underground wall of a building when viewed in a plan view, and the inside of the underground continuous wall is predetermined. The second step of drilling to the depth, the third step of drilling the hole for the nail nail installation to be inclined downward to the underground continuous wall caused by the excavation, inserting the tension sole nail into the hole for the nail nail installation hole of the underground continuous wall and through the pipe inner surface Injecting and curing the grouting material and then tensioning the steel wire to give tensile force to the steel wire, the fifth step of repeating the third and fourth steps several times, the first step to the fifth step The construction of underground wall which is the main body of the building by installing the reinforcement and formwork inside the continuous continuous wall body obtained by After the cement mortar is cured in the sixth step and the sixth step, the formwork is removed and the seventh step of filling the cement mortar in the space between the continuous wall and the underground wall is filled.

The process of constructing the first continuous underground wall of the first step is to use excavation equipment such as auger, hydro mill, rectangular continuous wall excavator, boring machine and the like to construct the underground wall of the building. Excavate a trench of a predetermined shape and insert a stress material such as a reinforcing steel bar or H type steel, steel pipe, sheet pile, panel, etc., and then install cement mortar. After excavating at a predetermined interval to complete the construction to build the preceding panel and then to build a continuous by excavating the trench between the construction.

Hereinafter, the construction method of the tension sole nail of the present invention and the underground continuous wall using the same will be described in detail with reference to the accompanying drawings.

Figure 4 is an exploded perspective view showing a tension thumbnail of one embodiment according to the present invention, Figure 5 is an assembled cross-sectional view of Figure 4, Figure 6 is an exploded perspective view showing a tension thumbnail of another embodiment according to the present invention, Figure 7 Is an assembled cross-sectional view of FIG.

As shown in the figure, the tension nail of the present invention 100 is provided with a nail reinforcement as a pipe 110, the lower fixing member 120 is fastened and fixed to one end of the pipe 110 and the other The upper fixing member 130 at the end is supported by the nut 140. Steel wire 150 is to impart a tension force from the upper fixing member 130 to the pipe 110 and the lower fixing member 120, depending on the construction conditions or design selectively inside or outside the pipe 110 It is installed to give tension. The steel wire 150 is covered with an outer shell 151, the outer shell 151 of the outer steel wire 150 allows the steel wire 150 to flow in its axial direction when it is extended by applying tension to the steel wire 150 You should be able to.

The lower fixing member 120 is formed with a female thread 121 for fastening with the outer surface of the end of the pipe 110 and the steel wire through-hole 122 is formed to guide the steel wire 150 to the inside or the outside of the pipe 110. Grouting material injection hole 123 is provided in the center cap shape.

The upper fixing member 130 is configured to be different from the case where the steel wire is penetrated to the inside of the pipe 110 and the outside of the pipe 110. When the steel wire 150 is installed to the outside of the pipe 110, the upper fixing member 130 has a rectangular hole 132 to pass through at least one or more adjacent pipe 110, as shown in Figs. The front pressure plate 131 is provided, it is installed in contact with the front pressure plate 131, the plate-shaped fixing having a pipe hole 134 and the wedge hole 135 through which the pipe 110 and the steel wire 150 of the outside passes through The body 133 is provided, and is inserted into the wedge hole 135 of the fixing body 133 and is provided as a wedge 136 for gripping the steel wire 150.

The upper fixing member 130 when the steel wire 150 penetrates into the pipe 110 has a rectangular hole 132 such that at least one adjacent pipe 110 penetrates as shown in FIGS. 6 and 7. The front pressure plate 131 is provided, is installed in contact with the front pressure plate 131 is formed in a cap shape covering the end of the pipe 110 and the nut 140 fastened thereto and a steel wire inside the pipe 110 A fixing body 133a having a wedge hole 135 through which the 150 is penetrated is provided, and is provided as a wedge 136 inserted into the wedge hole 135 of the fixing body 133a to grip the steel wire 150. do.

The pipe 110 is preferably provided as a steel pipe, but may be provided as a non-ferrous metal pipe or a fiber reinforced plastics (FRP) pipe.

Even if the construction is invaded by the land boundary of others in the tension soil nail of the present invention should not adversely affect the land construction of others, if the pipe 110 is applied to the steel pipe can not be constructed as a small nail.

In particular, when the pipe 110 is provided with fiber-reinforced plastic, after completing the construction of the underground continuous wall, the tension of the wire 150 is released from the tension sole nail of the present invention installed in the ground through the underground continuous wall. Pulling on the ends of the liner only removes the liner. Pipe 110 of fiber-reinforced plastic that is maintained in the ground construction does not need to be removed because it does not adversely affect the land work of others, which is a fragile material.

In the pipe 110 between the upper fixing member 130 and the lower fixing member 120, when the steel wire 150 is installed outside the pipe 110, a plurality of gap maintaining members 160 supporting the steel wire 150 are provided. Is installed.

The steel wire 150 is returned from the upper fixing member 130 to the upper fixing member 130 through the lower fixing member 120 at the tip of the pipe 110 as shown in the accompanying drawings, and has one strand at the upper fixing member 130. Although only shown and described as fixing both ends of the steel wire 150, it will be obvious that the steel wire ends can be fixed in the upper fixing member and the lower fixing member, respectively, using two strands of steel wire.

It will be described in detail with respect to the process of building the underground wall using the tension nail of the present invention configured as described above.

First, as shown in FIG. 9A, the outer wall 200, which is a continuous continuous wall, is constructed in a shape that intends to construct an underground wall of a building. In the process of constructing the outer wall 200, a trench 201 having a circular shape is continuously connected using an excavation equipment such as an auger, a boring machine, and the like to construct an underground wall of a building. Excavation to the depth according to the design value and inserting the H-type steel, which is a stress material 202 selectively in the trench 201 according to the construction design, the cement mortar 203 is poured and cured.

The trench may be excavated in a rectangular shape using a hydro mill, a rectangular continuous wall excavator, and the like in the case of excavation with a rectangular trench 201 at a predetermined interval to construct the preceding panel. After completing the process, excavation of the trench between them completes the construction of the trailing panel, so that a continuous underground continuous wall is constructed. The stress material 202 should also be installed in the rectangular trench. Since the trench is rectangular, the stress material 202 may be variously applied to rebar networks, steel pipes, sheet piles, panels, and the like. .

After completing the construction of the outer continuous wall 200, which is an underground continuous wall as described above, excavate the inner side of the outer wall 200, which is a dotted line shown in FIG. 9A, as shown in FIG. Excavate to a depth of approximately 1.5 ~ 3M using.

As the above-mentioned excavation of the inner side of the outer wall 200, the outer wall 200 is drilled down the perforated hole 23, which is a hole for installation of the nail nail, to be inclined downward using the perforator 22, which is a punching equipment, as shown in FIG. Subsequently, the tension sole nail 100 of the present invention is inserted into the perforation hole 23 of the outer wall 200 to complete the finish tension.

At this time, the construction process of the tension soil nail 100, the pipe 110 of the tension soil nail 100 is inserted into the drilling hole 23 located on the horizontal line of the outer wall 200, but in the tension soil nail 100 After removing the front pressure plate 131 and the fixing body 133, the lower fixing member 120 is inserted into the ground, and then the grout hose is connected to the end of the pipe 110, and the pipe 110 through the grout hose. The grouting material, either cement milk or cement mortar, is injected into the inner surface to cure.

Afterwards, the pipe 110 of the two or more tension sole nails 100 adjacent to each other among the tension soil nails 100 visible on the horizontal line of the outer wall 200 opens the rectangular hole 132 of the front pressure plate 131. It is installed to protrude through, the end of the pipe 110 protruding through the rectangular hole 132 of the front pressure plate 131 is in the pipe hole 134 of the fixing body 133, the end of the steel wire 150 The fixing body 133 is installed so as to be inserted into the wedge hole 135 of the fixing body 133, and then the nut 110 is fastened to the pipe 110 and the steel wire 150 is gripped by the wedge hole 135. After installing the wedge 136 as much as possible, tension the steel wire 150 with a tensioner to give a tensile force to the steel wire 150 and then remove the tensioner.

The inner side of the outer wall 200 described above is excavated again to a predetermined depth, and the punched hole 23 is drilled using the punching machine 22 which is a drilling equipment on the outer wall 200 that is present, and the punched hole of the outer wall 200. The outer wall 200 is obtained by inserting the tension sole nail 100 of the present invention in (23) and repeating it several times to complete the digging work as shown in FIG. 9F.

Reinforce the inside of the outer wall 200 which is the underground continuous wall and install the formwork, and then by pouring cement mortar to cure to build the underground wall 220 as a building body, the cement mortar of the underground wall 220 is cured and After the formwork is removed and the cement mortar is filled in the space between the outer wall 200 and the basement wall 220, the construction of the basement wall 220, which is the building body as shown in FIG. 8, is completed.

In the basement wall structure of the present invention, the thickness of the outer wall 200 is a and the thickness of the backfill portion is b, and the thickness of the basement wall 220 is represented by c. As the outer wall 200 is vertical, the space of the backfill portion is small. This reduces the consumption of construction aggregates and reduces the thickness of the entire wall.

As described in detail above, the construction method of the tension sole nail and the underground continuous wall using the same according to the present invention, the construction of the underground continuous wall in the shape to plan the construction of the wall of the building in plan view, By excavating the inside and repeating the process of constructing the tension soil nail down to the underground continuous wall that was exposed by this excavation several times, and then adopting the construction method of constructing the underground body which is the main body of the building inside the underground continuous wall. In addition, the underground continuous wall can be reinforced by tension tension nails, and the underground continuous wall can be used as the base wall of the building body, thereby reducing the thickness of the base wall of the entire building body. It is a useful invention that can increase the building area by decreasing.

In addition, the present invention, unlike the existing construction method of the construction of the existing underground wall to install the first and second shotcrete on the excavation side wall, and install the nail nail, after constructing the underground continuous wall vertically and excavating the inside of the tension soil nail As the process is repeated several times, the excavation work is simplified and construction is easy, and the excavation side wall is vertical and the side wall surface is relatively flat, so that the gap between the underground walls to be built inside is minimized. Can reduce the working time.

Claims (6)

delete delete The lower fixing member is fixed to one end of the nail (reinforcement material) and the upper fixing member is fastened and installed by the nut on the other end, and includes a tension wire connected to provide a tension force from the upper fixing member to the lower fixing member. For small nails, The upper fixing member provided with steel wires on the outside of the pipe is a plate-shaped plate having a front pressure plate formed with a rectangular hole so that at least one adjacent pipe passes therethrough, and a wedge hole provided in contact with the front pressure plate to install a steel wire outside the pipe. A fixing body and a wedge inserted into a wedge hole of the fixing body and holding a steel wire, The lower fixing member is a tension sole nail, characterized in that the female screw is formed for fastening with the pipe end outer surface and the steel wire through-hole is formed so that the steel wire penetrates into or out of the pipe. delete delete When viewed from a plan, the first step of constructing the underground continuous wall in the shape of the construction of the underground wall of the building, the second step of excavating the inner side of the underground continuous wall to a predetermined depth, down to the underground continuous wall exhibited by the excavation In the third step of obliquely drilling the holes for installing the nail nail, insert a tension sole nail in which one continuous steel wire is installed in the small nail installation hole of the underground continuous wall, inject and cure the grouting material through the inner surface of the pipe, and then The fourth step of applying the tensile force to the steel wire by tensioning, the fifth step of repeating the third and fourth steps of construction several times, the inner side of the underground continuous wall obtained by performing the steps from the first step to the fifth step In the sixth step, the cement mortar in the sixth step to install the base wall and formwork in the building and to install the cement mortar, the underground wall which is the main body of the building A method of constructing an underground wall using a tension soil nail, characterized in that the seventh step of removing the formwork after curing and filling the mortar with cement mortar in the space between the underground continuous wall and the underground wall.

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