KR101986134B1 - earth pressure supporting structure and construction method thereof - Google Patents

Abstract

The present invention relates to a structure to install an earth pressure support of a steel pipe cutting part with an adjustable height and a construction method thereof and, more specifically, to a structure to install an earth pressure support of a steel pipe cutting part with an adjustable height, capable of installing an earth pressure support without making a gap by properly adjusting the length of the earth pressure support when an error occurs between the length of the earth pressure support and the height of an earth pressure support installation space. According to the present invention, in regard to installing a vertical earth pressure support between a waterproof steel plate installed in the upper part of the steel pipe cutting part and a fixing plate installed in the lower part, a conduction prevention plate is installed between the fixing plate and the lower part of the earth pressure support, but the conduction prevention plate includes a vertically penetrated insertion hole formed to enable the lower part of the earth pressure support to be inserted thereinto, and a support protrusion gradually becoming taller as the protrusion gets closer to one side is formed on the edge of the insertion hole, and the earth pressure support includes a hanging protrusion formed on the edge of the lower part to be placed on the support protrusion. According to the present invention, since the height of the earth pressure support can be adjusted from the conduction prevention plate, the upper part of the earth pressure support is installed close to the waterproof steel plate, so the earth pressure support can be stably installed without an extra steel plate.

Description

[0001] The present invention relates to an earth pressure support structure for a steel pipe incision and to a tunnel construction method using the same,

More particularly, the present invention relates to a structure for installing the earth pressure support of a steel pipe cut-off part capable of adjusting the height of a steel pipe, and more particularly, The present invention relates to a structure for installing a soil-pressure supporting member of a steel pipe cut-out part, which can be installed without a gap, and a tunnel construction method using the same.

Generally, as shown in Patent No. 10-1022382, the non-detachable underground tunnel construction method includes a step of installing a propulsion base and a reaction wall, a step of guiding a leading pipe and a pipe, a step of grouting, a step of cutting a steel pipe, Installation step, form setting step, reinforcement step, concrete pouring and curing step, and internal excavation step of the structure.

1, the waterproof steel plate 2 is welded to the upper end of the steel pipe cutout portion 1 and the fixing plate 3 is welded to the lower end of the steel pipe cutout portion 1, And then a cylindrical earth pressure support base 4 is vertically installed between the waterproof steel plate 2 and the fixed plate 3 and the upper and lower ends are welded together.

In the course of horizontally cutting the side surface of the steel pipe P, it is difficult to precisely cut the steel pipe P, so that the opposite surfaces of the waterproof steel plate 2 and the fixing plate 3 are not substantially parallel. Since the waterproof steel plate 2 and the fixing plate 3 are not parallel to each other, the length of the earth pressure support 4 is long or short, which makes it difficult to install the waterproof steel plate 2 and the fixing plate 3.

When the length of the earth pressure support 4 is long, one end is cut to adjust the height. In order to improve the durability of the earth pressure support 4, concrete is poured therein and is cured. And it takes a considerable amount of time. Because of this problem, most earth pressure supports 4 are designed to be shorter than the actual length of the space to be installed, and a gap between the earth pressure supporter 4 and the waterproof steel plate 2, which is caused by this, is inevitable. This gap is formed by inserting the filling steel plate 5 made of metal and then integrating the waterproof steel plate 2 and the steel plate 5 and the steel plate 5 and the earth pressure support 4 sequentially by welding.

However, since the intervals of the gaps are different from each other, it is necessary to sufficiently retain the steel sheet 5 by thickness, and it is troublesome to carry all of these steel sheets 5. Nevertheless, since the surface of the steel plate 5 and the end of the earth pressure support base 4 are not completely tightly contacted with each other and a gap is formed in one of them, the weldability of the weld zone is difficult and the durability of the earth pressure support base 4 is unstable State.

The earth pressure support for solving such a problem is disclosed in Korean Patent No. 10-1462370, and its structure will be described as follows.

A vertical earth pressure support base 4 is provided between a waterproof steel plate 2 provided at the upper end of the steel pipe cutout 1 and a fixed plate 3 installed at the lower end of the steel pipe cutout 1, The conductive plate 6 is fixedly installed between the fixed plate 2 and the fixed plate 3. The conductive plate 6 is provided with an insertion hole 6a passing through the upper and lower portions, 6a. The conduction preventing plate 6 provided on the upper part forms an injection groove 6b penetrating from the outer side surface to the insertion hole 6a so that the mortar M can be injected into the space inside the insertion hole 6a.

The earth pressure supporter (5) having such a structure can be installed without a gap, and it is not necessary to carry a separate filler steel plate, thereby reducing the construction cost.

However, there is a disadvantage that the earth pressure support 4 can not be installed when a gap G larger than the thickness of the conduction preventing plate 6 is generated. Further, it is troublesome to install and remove a separate clamp in order to prevent the conduction preventing plate 6 from being separated from the earth pressure support base 4.

KR Patent Registration No. 10-1022382 (Mar. 23, 2011) KR Patent Registration No. 10-1462370 (November 10, 2014)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a steel pipe cutter capable of being installed in a stable manner without a gap even if the distance between the waterproof steel plate and the fixed plate is different from that of the earth pressure support, And a tunnel construction method using the same.

In order to achieve the above object, according to the present invention, there is provided a structure for installing a pressure-

In providing a vertical earth pressure support between a waterproof steel plate installed at the upper end of the steel pipe cutout and a fixed plate installed at the lower end,

A distance between the bottom of the earth pressure supporter and the fixed plate is reduced,

The lower end of the earth pressure support is inserted into the insertion hole, and the support step is formed on the insertion hole to gradually increase toward the one side,

And the earth pressure support base is formed with a locking protrusion around the lower portion so as to rest on the support protrusion.

Further, the support jaw may be formed as a step-like or inclined oblique line.

Further, the insertion hole is formed with a groove through which the latching jaw penetrates.

In addition, the tunnel construction method using the installation structure of the earth pressure support of the steel pipe cut-

In providing a vertical earth pressure support between a waterproof steel plate installed at the upper end of the steel pipe cutout and a fixed plate installed at the lower end,

A step of arranging a conduction preventing plate on the earth pressure supporting member, and placing a conduction preventing plate on the supporting member of the earth pressure supporting member;

Vertically placing a earth-pressure support having an anti-reflection plate therebetween between the waterproof steel plate and the fixing plate;

Lowering the conduction preventing plate to weld the conduction preventing plate and the fixing plate to integrate them;

Placing the locking protrusion on the upper end of the supporting protrusion after lifting the earth pressure support to rotate;

Welding the upper end of the earth pressure support to the waterproof steel plate and integrating them; And

Injecting a mortar into the insertion hole of the conduction preventing plate to cure it; .

Since the height of the earth pressure support is controlled from the travel prevention plate, the upper end of the earth pressure support is closely installed with the waterproof steel plate so that it can be stably installed without a separate steel plate There is an effect that can be.

In addition, since the height of the earth pressure support is adjusted by lifting and rotating the earth support, the elevation can be adjusted very quickly and easily.

In addition, since the conductive plate is mounted on the upper part of the step in the process of forming the groove through which the step can pass through the insertion hole, a separate clamp for supporting the conductive plate is not required.

In addition, by forming the supporting jaws obliquely with an oblique line, there is an effect that the height of the earth pressure support can be adjusted to a fine height.

Figs. 1, 2A, and 2B are views showing an installation structure of a conventional earth pressure support.
3 is a perspective view showing a structure of a earth pressure support according to the present invention.
4 is a front view showing the structure of the earth pressure support according to the present invention.
5 is a plan view showing the structure of the earth pressure support according to the present invention.
6 is a sectional view taken along the line AA in Fig. 5;
FIG. 7 is a flowchart of a tunnel construction process using a earth pressure support according to the present invention. FIG.
8 is a plan view showing a state in which the earth pressure support according to the present invention is rotated and raised and lowered.
9 is a sectional view taken along line BB of Fig.
10 is a plan view showing a state in which the earth pressure support member according to the present invention is rotated up and down.
11 is a cross-sectional view taken along line CC of Fig.
12 is a sectional view showing the earth pressure support according to another embodiment of the present invention;
13 is an exemplary view showing a earth pressure support according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the installation structure of the earth pressure supporter of the steel pipe cut-off section and the tunnel construction method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view showing the structure of the earth pressure support according to the present invention, FIG. 4 is a front view showing the structure of the earth pressure support, FIG. 5 is a plan view showing the structure of the earth pressure support, 9 is a cross-sectional view taken along line BB of FIG. 9, FIG. 10 is a plan view showing a state in which the earth pressure support is rotated to its maximum height by elevation, and FIG. Is a sectional view of the CC line.

As shown in these drawings, the installation structure of the earth pressure support of the steel pipe cut-off part according to the present invention includes a waterproof steel plate 20 installed at the upper end of the steel pipe cut-off part 10 and a vertical A conductive plate 50 is installed between the lower portion of the earth pressure support 40 and the fixing plate 30 and the conductive plate 50 is inserted into the insertion hole 51 The lower end of the earth pressure support base 40 is inserted into the insertion hole 51 and the base end of the earth pressure support base 40 is gradually raised toward the one side of the insertion hole 51, And a locking protrusion 41 is formed on the lower periphery thereof so as to be laid on the supporting protrusion 52.

The conduction preventing plate 50 is formed in a horizontal plate shape, and an insertion hole 51 is formed at the center in a circular shape. The insertion hole 51 is formed to be slightly larger than the outer diameter of the earth pressure support 40 so that the earth pressure support 40 is inserted.

Also, the conductive plate 50 is formed with a base plate 52 protruding upwardly from the insertion hole 51. The pedestal base 52 is formed around the insertion hole 51 so that it is formed in a circular shape when viewed from above, and is formed to be gradually higher toward one side. The gradually increasing shape is made up of stairs. A numerical value is written for each height on the periphery of the supporting jaw 52 so that the position of the jaw can be confirmed through numerical values.

In the meantime, the earth pressure support base 40 is formed in a cylindrical shape with concrete poured therein, and a locking protrusion is protruded around the lower portion thereof. The height of the earth pressure support base 40 is determined by the position of the engagement protrusion 41 because the engagement protrusion 41 is seated on the support protrusion 52 of the conductive plate 50.

As described above, the starting point at which the base jaws 52 are gradually elevated is provided at two or more positions, and the base jaws 41 are formed at regular intervals and at the same number in the same number.

The lower end of the earth pressure support 40 is inserted into the insertion hole 51 when the engagement protrusion 41 is located at the highest position of the support step 52, that is, The height of the engagement step 41 from the lower end of the earth pressure support 40 should be designed to maintain the state.

In addition, a recess 53 is formed in a portion of the periphery of the insertion hole 51, through which the latching protrusion 41 penetrates. The groove 53 is formed to be slightly larger than the engaging jaw 41 so as to smoothly pass through the engaging jaw 41.

A numerical value is written for each height on the base jaw 52, and is used for construction.

The tunnel construction method using the installation structure of the earth pressure support of the height-adjustable steel pipe incision part according to the present invention having the above-described structure is constructed by the process shown in FIG. 7, and the process will be described in detail.

(ST100) of stepping in the steel pipe (P) by using the hydraulic jack and the propulsion auxiliary pipe; A step (ST200) of grouting the outside of the gang by injecting a grout material through a valve installed in the steel pipe (P); Cutting a side surface of the steel pipe P (ST300); A step (ST400) of welding the waterproof steel plate (20) and the fixing plate (30) to the steel pipe cutout (10); A step ST500 of inserting the vertical beam B1 and the horizontal beam B2 into the steel pipe cutout 10; A step (ST600) of placing the conductive plate 50 on the earth pressure support 40 and placing the conductive plate 50 on the upper surface of the engagement protrusion 41 of the earth pressure support 40; (ST700) of vertically placing the earth pressure supporter (40) fitted with the conduction preventing plate (50) between the waterproof steel plate (20) and the fixed plate (30); A step (ST800) of lowering the conduction preventing plate (50) to weld and integrate the conduction preventing plate (50) and the fixing plate (30); (ST900) of lifting up the earth pressure support base (40) and rotating the earth pressure support base (40), and then seating the catching jaw on the upper end of the support base (52); (ST1000) welding and integrating the upper end of the earth pressure support stand (40) and the waterproof steel plate (20); (ST1100) injecting and curing the mortar M into the insertion hole 51 of the conduction preventing plate 50; Excavating the tunnel (ST1200); A step of arranging the reinforcing bars (ST1300); Pouring concrete (ST1400); .

First, a propulsion base and a reaction force wall are installed before the steel pipe P is press-fitted, and the steel pipe P is stepped up by using a hydraulic jack in a state where a leading pipe is inserted into the leading end of the steel pipe P And the inside of the press-fitted steel pipe P is excavated (ST100).

When the pressurization of the steel pipe P is completed, the grout material is injected through the valve provided in the steel pipe P to grout the outside of the gang to prevent the leakage of the ash (ST200).

When the grouting injection is completed, the side of the steel pipe P is cut. At this time, the left and right sides of the steel pipe P arranged in the horizontal direction are cut, and the steel pipe P arranged in the vertical direction is cut at the upper and lower sides, and partially cut sequentially (ST300).

Next, the waterproof steel plate 20 is welded to the upper end of the steel pipe cutout portion 10, and the fixing plate 30 is welded to the lower end of the steel pipe cutout portion 10 (ST400).

The vertical pipe (B1) and the horizontal pipe (B2) are inserted into the steel pipe cut-off portion (10). The vertical beam B1 is inserted into a vertically cut steel pipe cutout 10 and the horizontal beam B2 is inserted into a steel pipe cutout 10 cut in a horizontal direction. The portion to which the vertical beam B1 and the horizontal beam B2 are connected is integrated by bolting or welding (ST500).

Next, the plurality of earth pressure support rods 40 are respectively fitted with the conduction prevention plates 50, but the engagement protrusions 41 of the earth pressure support rods 40 and the groove 53 of the conduction prevention plates 50 do not coincide with each other, When the support stand 40 is vertically erected, the anti-reflection plate 50 is placed on the engagement protrusion 41 of the earth pressure support 40 (ST600).

In this state, the earth pressure support 40 is vertically positioned between the waterproof steel plate 20 and the fixed plate 30. At this time, since the conductive plate 50 is placed on the engagement protrusion 41 of the earth pressure support 40, a separate clamping device for supporting the conductive plate 50 is not necessary. Further, the installation and removal of the clamping device are also required (ST700).

Next, when the recess 53 is brought into alignment with the engagement protrusion 41 by rotating the conduction preventing plate 50, the engagement protrusion 41 passes through the recess 53 and the fall prevention plate 50 is lowered. The descending falling prevention plate 50 is closely attached to the lower fixing plate 30 and welded between the periphery of the transmission preventing plate 50 and the fixing plate 30 (ST800).

In this state, the earth pressure support base 40 is lifted and the upper end is brought into close contact with the waterproof steel plate 20, and then the earth pressure support base 40 is rotated. At this time, when the earth pressure supporting base 40 is rotated until the catching jaw 41 is caught by the receiving base 52, the catching jaw 41 is seated on the base receiving jaw 52 so that the earth pressure supporting base 40 does not descend (ST900).

The upper end of the earth pressure support 40 and the waterproof steel plate 20 are welded and integrated. In this state, the steel pipe P, the fixed plate 30, the conductive plate 50, the earth pressure supporter 40, and the waterproof steel plate 20 are all integrated (ST1000).

The mortar M is filled and cured into the groove 53 of the conduction prevention plate 50 in order to fill and reinforce the space formed in the insertion hole 51 of the conduction prevention plate 50 as the earth pressure support 40 ascends and descends The construction of the earth pressure support is completed (ST1100).

When the earth pressure support 40 is completed, the tunnel is excavated. In this process, while cutting the inner side steel pipe of the tunnel, the lower supporting beam and the central temporary strut are installed and the excavation is performed (ST1200).

Next, the foundation reinforcement, the intermediate column reinforcement, the wall reinforcement, and the slab reinforcement are disposed (ST1300).

Finally, the construction is completed by installing the formwork and pouring and curing the concrete (ST1400).

12 is a cross-sectional view illustrating a earth pressure support according to another embodiment of the present invention. As shown in the drawing, the earth pressure support 40 may also be provided with a conduction prevention plate 50 on the upper part thereof. This is used even when the earth pressure supporter 40 is raised to the maximum height and the waterproof steel plate 20 does not touch the upper end of the earth pressure supporter 40. That is, the gap between the waterproof steel plate 20 and the fixed plate 30 is extremely large. When the conductive plate 50 is installed on the top of the earth pressure support 40 as described above, the conductive plate 50 and the waterproof steel plate 20 are welded to each other, ).

FIG. 13 is an exemplary view showing a earth pressure support according to another embodiment of the present invention. As shown in the drawing, the support jaw 52 is formed in a sloped oblique shape. Since the height of the earth pressure supporter 40 can be controlled very finely when the support wall 52 is inclined, it is possible to substantially eliminate the gap between the top of the earth pressure supporter 40 and the waterproof steel plate 20 It is effective.

10: Steel pipe incision part 20: Waterproof steel plate
30: fixed plate 40: earth pressure support
41: latching jaw 50:
51: insertion hole 52:
53: groove B1: vertical beam
B2: Horizontal beam P: Steel pipe

Claims (6)

Step ST100 of stepping in the steel pipe P stepwise;
(ST400) welding the waterproof steel plate 20 and the fixing plate 30 to the upper and lower ends of the steel pipe cutout portion 10, respectively;
A step (ST600) of placing the conductive plate 50 on the earth pressure support 40 and placing the conductive plate 50 on the upper surface of the engagement protrusion 41 of the earth pressure support 40;
(ST700) of vertically placing the earth pressure supporter (40) fitted with the conduction preventing plate (50) between the waterproof steel plate (20) and the fixed plate (30);
A step (ST800) of lowering the conduction preventing plate (50) to weld and integrate the conduction preventing plate (50) and the fixing plate (30);
A step (ST900) of placing the locking protrusion (41) on the top of a stepped or inclined oblique base (52) after the earth pressure support (40) is lifted and rotated;
(ST1000) welding and integrating the upper end of the earth pressure support stand (40) and the waterproof steel plate (20); And
(ST1100) injecting and curing the mortar M into the insertion hole 51 of the conduction preventing plate 50; Wherein the tunnel construction method comprises the steps of:
Step ST100 of stepping in the steel pipe P stepwise;
A step (ST200) of grouting the outside of the gang by injecting a grout material through a valve installed in the steel pipe (P);
Cutting a side surface of the steel pipe P (ST300);
(ST400) welding the waterproof steel plate 20 and the fixing plate 30 to the upper and lower ends of the steel pipe cutout portion 10, respectively;
A step ST500 of inserting the vertical beam B1 and the horizontal beam B2 into the steel pipe cutout 10;
A step (ST600) of placing the conductive plate 50 on the earth pressure support 40 and placing the conductive plate 50 on the upper surface of the engagement protrusion 41 of the earth pressure support 40;
(ST700) of vertically placing the earth pressure supporter (40) fitted with the conduction preventing plate (50) between the waterproof steel plate (20) and the fixed plate (30);
A step (ST800) of lowering the conduction preventing plate (50) to weld and integrate the conduction preventing plate (50) and the fixing plate (30);
A step (ST900) of lifting the earth pressure support (40) to rotate and then placing a locking step on an upper end of a stepped or inclined oblique pedestal (52);
(ST1000) welding and integrating the upper end of the earth pressure support stand (40) and the waterproof steel plate (20);
(ST1100) injecting and curing the mortar M into the insertion hole 51 of the conduction preventing plate 50;
Excavating the tunnel (ST1200);
A step of arranging the reinforcing bars (ST1300); And
Pouring concrete (ST1400); A method of constructing a tunnel using an installation structure of the earth pressure support of a height-adjustable steel pipe incision comprising delete delete delete delete

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