KR102287212B1 - Steel pipe press-fitting apparatus - Google Patents

Abstract

The present invention relates to a steel pipe jacking apparatus with an improved grouting liquid injection structure, comprising: a lead steel pipe pressed into an underground excavation hole; a spray hole formed on the pressed front end of the lead steel pipe; and a guide cap which is formed along the outer peripheral surface of the lead steel pipe, wraps the spray hole, and has a rear-open spray space connected with the spray hole therein. The steel pipe jacking apparatus is implemented such that grouting liquid press-transported through the spray hole is injected toward the excavation hole through the spray space of the guide cap. Therefore, the grouting liquid is injected in the excavation hole at regular intervals, thereby stabilizing a ground of the excavation hole to construct the steel pipe jacking.

Description

Grouting liquid injection structure improvement type steel pipe press-fitting device {STEEL PIPE PRESS-FITTING APPARATUS}

The present invention relates to a steel pipe press-fitting device for burying a steel pipe by crossing an excavation hole formed in the ground. In particular, after press-fitting a lead steel pipe by a certain distance, the process of injecting the grouting liquid into the excavation hole is repeated while the press-fitting is performed. This is a technology related to a steel pipe press-fitting device with an improved grouting liquid injection structure that allows the grouting liquid to be directly injected at a certain distance.

In general, non-cutting excavation is an excavation method used to install water and sewage pipes, communication lines, or power lines by crossing the underground of an already constructed road. It is applied to cases where it is impossible to open and close due to interference or obstacles in vehicle communication.

Here, in the non-opening excavation method, a forward base and a reach base, which are the concept of a work area, are essential on both sides of a crossing road or obstacle. The steel pipe press-in method (underground press-in method, steel pipe loop method) is widely known by

As a technology related to such a steel pipe or a steel pipe press-fitting device for the same,

Republic of Korea Patent Registration No. 10-0887189 (Registered on February 27, 2009, hereinafter referred to as 'Document 1') 『Leading pipe device for holding curtain and horizontal adjustment press fit』 is presented,

Document 1 is a device for preventing the tip of a propulsion steel pipe installed in the ground from being bent downward by a load in an unstable ground in order to construct an underground structure by a non-opening method, the tip of the propulsion steel pipe and a cylindrical lead pipe connected to the lead pipe, and a spray nozzle mounted at the lower end of the fresh line pipe to spray the grouting mixture at a high speed in the ground direction supporting the lower end of the fresh line pipe, wherein the spray nozzle is centered on the outer peripheral surface of the lead pipe At a certain distance in the circumferential direction, the leak prevention plate protruding is formed to extend in the longitudinal direction of the lead pipe, thereby preventing the propulsion steel pipe from sagging downward by its own load. It is a technology related to the tube device.

As another technique, Korean Patent Registration No. 10-1065872 (Registered on Sep. 9, 2011, hereinafter referred to as 'Document 2') 『Propulsion lead pipe equipped with a spray nozzle』 is proposed,

Document 2 discloses a metal steel pipe that is a cylindrical pipe, a metal reinforcing ring that is a cylindrical pipe and is joined so that its inner surface is in contact with the outer surface of the distal end of the steel pipe, and is installed in a circumferential shape on the inner surface of the distal end of the steel pipe and contains air and bentonite. A nozzle bundle in which a plurality of spray nozzles are formed in a direction parallel to the central axis of the cylinder of the steel pipe, and air passing through the steel pipe and connected to the nozzle bundle to supply air to a space formed inside the nozzle bundle By including a supply pipe and a bento supply pipe that passes through the steel pipe and is connected to the nozzle bundle and supplies bentonite to the space formed inside the nozzle bundle, a lead pipe used in the steel pipe propulsion method for supporting the ground during underground structure construction It is a technology related to a lead pipe for propulsion equipped with a spray nozzle that enables smooth propulsion by spraying high-pressure air, bentonite, water, etc. in the front part.

Document 1. Korean Patent Registration No. 10-0887189 (Registered on February 27, 2009) Document 2. Korean Patent Registration No. 10-1065872 (Registered on September 9, 2011)

It is an object of the present invention to provide a grouting liquid injection structure improvement type steel pipe press-fitting device that allows the grouting liquid to be directly injected into an excavation hole at a predetermined distance.

Furthermore, it is an object of the present invention to provide a grouting liquid injection structure improvement type steel pipe press-fitting device that allows the injection amount of the grouting liquid injected into the excavation hole to be appropriately adjusted according to the soil quality.

In order to solve the above problems, a grouting liquid injection structure improvement type steel pipe press-fitting device according to the present invention,

Leading steel pipe press-fitted into an excavation hole formed in the ground;

a spray hole formed at a front end of the lead steel pipe press-fitted; and

a guide cap formed along the outer circumferential surface of the lead steel pipe and having a spray space part that is opened rearwardly inside the spray hole and is in communication with the spray hole;

It is characterized in that the grouting liquid, which is pressurized to the injection hole, including a, is injected toward the excavation hole through the injection space portion of the guide cap.

A grouting liquid injection structure improvement type steel pipe press-fitting device according to the present invention,

As the grouting fluid injection into the excavation hole is performed at a certain distance, the ground stability of the more robust and durable excavation hole is possible, and the optimal effect can be obtained because the injection amount of the grouting liquid can be adjusted according to the soil quality of the excavation hole. .

1 is a configuration diagram of a use state in which a grouting liquid injection structure improvement type steel pipe press-fitting device according to the present invention is installed;
2 is a cross-sectional side view showing a steel pipe press-fitting device according to the present invention;
3 and 4 are a side cross-sectional configuration diagram showing a first injection amount control means and its use state;
5 is a front configuration view for showing that the guider of the first injection amount adjusting means is made of two powders;
6 is a side cross-sectional configuration view showing a second injection amount control means;
7 is a front cross-sectional configuration view showing a second injection amount adjusting means;
8 is a side cross-sectional configuration view showing the use state of the second injection amount adjusting means;
9 is a side cross-sectional configuration view for showing the clean means;
Figure 10 is a side cross-sectional configuration view for showing the guide blades, slopes and concave grooves.

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

Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all the technical spirit of the present invention, so various equivalents that can replace them at the time of the present application It should be understood that there may be water and variations.

3, the direction of the guide cap side will be specified as the front or front side, and the guider side will be referred to as the rear or rear side.

1 to 10, the grouting liquid injection structure improvement type steel pipe press-fitting device according to the present invention,

It is largely composed of a fresh steel pipe 10 , an injection hole 20 , and a guide cap 30 .

Looking at each configuration,

The lead steel pipe 10 is

As shown in Figures 1 to 4,

It is press-fitted into the excavation hole (1) formed in the ground through a hydraulic jack, etc.

It is made of a metal material and has a certain length and has a hollow cylindrical structure.

At this time, a tube body 11 for pressurizing the grouting liquid supplied from the outside to the injection hole 20 is provided in the fresh steel pipe 10, and the tube body 11 includes an external grouting liquid supply device (not shown) and A pair of first supply lines 111 connected, a T-shaped relay member 112 connected to each of the first supply lines 111 , and an inlet of the relay member 112 and the injection hole 20 . and a second supply line 113 that interconnects them.

Here, a mixture of silicic acid and water is transferred to one first supply line 111 of each of the first supply lines 111 , and a mixture of bentonite and cement, etc. is transferred to the other first supply line 111 . This is transferred, and the two mixtures are mixed together while passing through the relay member 112 and transferred to the second supply line 113 .

The injection hole 20 is

As shown in Figures 2 to 5,

It is formed at the front end of the lead steel pipe 10 to be press-fitted to spray the grouting liquid,

It has a circular hole structure that is vertically penetrating through the lead steel pipe 10 .

At this time, the injection hole 20 is disposed in the uppermost area on the outer circumferential surface of the fresh steel pipe 10 , in which the grouting liquid pressurized to the injection hole 20 exits the injection hole 20 and the fresh steel pipe 10 . ) is guided by the guide cap 30 as it flows down the outer circumferential surface so that it can be evenly injected into the excavation hole 1 side.

The guide cap 30 is

As shown in Figures 2 to 5,

When the fresh steel pipe 10 is press-fitted, the grouting liquid injected from the injection hole 20 is guided toward the drilling hole 1 while blocking the flow of soil and the like scattered from the drilling hole 1 into the injection hole 20 side. In order to be injected,

The injection space 31 is formed along the outer circumferential surface of the lead steel pipe 10 and is opened rearwardly inside the injection hole 20 while surrounding the injection hole 20 to communicate with the injection hole 20 .

is made including

At this time, the guide cap 30 may be integrally installed on the lead steel pipe 10 by welding or the like while being made of a metal material.

And, as shown in FIG. 10, the guide cap 30 is hinged to the rear end adjacent to the injection hole 20, and is pushed open by the grouting liquid injected toward the excavation hole 1, and then loses weight when the injection is released. A guide blade 32 is further provided to the original position by the.

As a result, the guide wing 32 blocks the outlet side of the injection space 31, so that when the fresh steel pipe 10 is press-fitted into the drilling hole 1, the soil and the like separated from the drilling hole 1 are sprayed. Inflow into the space 31 can be prevented as much as possible, and when the grouting liquid is injected in the stationary state after press-fitting into the lead steel pipe 10, the guide blade 32 is pushed and rotated by the injection pressure of the grouting liquid. By being opened, it is possible to inject the grouting liquid to the excavation hole (1) side.

And as shown in FIG. 10 , a slope 33 inclined to the rear and a plurality of concave grooves 34 long in front and back are formed on the inner circumferential surface of the injection space 31 of the guide cap 30 . . These slopes 33 serve to guide the grouting liquid 1 so that the grouting liquid 1 can be pushed and moved more easily, and each of these concave grooves 34 also guides the grouting liquid 1 so that the grouting liquid 1 can be moved to the rear side more easily. do

Accordingly, the grouting liquid pressurized to the injection hole 20 is injected toward the excavation hole 1 through the injection space 31 of the guide cap 30 .

On the other hand, the grouting liquid injection structure improvement type steel pipe press-fitting device according to the present invention is a first for controlling the injection amount of the grouting liquid injected from the outlet side of the injection space 31 of the guide cap 30 to the excavation hole 1 side. It further comprises an injection amount control means (40A) or a second injection amount control means (40B).

First, the first injection amount adjusting means (40A) is

As shown in Figures 3 to 5,

Two or more recesses 41 formed along the outer circumferential surface of the lead steel pipe 10 and disposed rearwardly spaced apart from the exit side of the injection space 31 of the guide cap 30, and

An annular guider 42 that is inserted and mounted in one of the recesses 41 and is erected to protrude outward and faces the outlet side of the injection space 31 of the guide cap 30 . )

is made including

At this time, as shown in FIG. 5, the guider 42 is composed of two upper and lower powders 421 divided by hollow circles, and these two powders 421 pass through the flange provided on the inside thereof and the It is detached from the recess 41 by a bolt 422 fastened to the peripheral region of the recess 41 .

Eventually, the position of the guider 42 is adjusted back and forth based on the prior information on the particle size of the soil obtained through geological investigation before the press-fitting of the fresh steel pipe 10 into the excavation hole 1 to adjust the injection amount of the grouting liquid according to the soil quality. that can be adjusted. For example, the guider 42 may be displaced to reduce the injection amount of the grouting liquid when the particle size of the soil is large and to increase the injection amount of the grouting liquid when the particle size of the soil is small.

The second injection amount adjusting means (40B) is

As shown in Figures 6 to 8,

A first guide hole 43 formed to penetrate vertically on the outer circumferential surface of the lead steel pipe 10 and disposed rearwardly spaced apart from the exit side of the injection space 31 of the guide cap 30;

a second guide hole 44 disposed in an area vertically facing the first guide hole 43 while vertically penetrating the outer circumferential surface of the lead steel pipe 10;

A rod 45 disposed to pass through each of the guide holes 43 and 44,

An annular guider 46 that faces the exit side of the injection space 31 of the guide cap 30 while connecting the upper and lower ends of the rod 45;

a front cover (47) extending forward from the guider (46) to cover a portion of the outer peripheral surface of the lead steel pipe (10);

A rear cover 48 extending rearward from the guider 46 and disposed on the same straight line as the front cover 47 to cover the guide holes 43 and 44, and

A driving unit 49 for moving the guider 46 forward and backward (進退)

is made including

At this time, the driving unit 49 includes a piston 491 connected to the middle portion of the rod 45 and a pneumatic cylinder in which the piston 491 is built in and moves the piston 491 forward and backward by selective supply of air. It consists of a main body 492, which is an example and may be variously modified and changed within a range that satisfies the condition for moving the guider 46 forward and backward. And it is preferable that the pneumatic cylinder body 492 is fixedly installed in the lead steel pipe 10 through a separate support body or the like.

As a result, as the rod 45 and the guider 46 connected thereto move forward and backward by the driving unit 49, the guider 46 and the injection space 31 of the guide cap 30 between the exit side Since it is possible to increase or decrease the space, it is possible to control the injection amount of the grouting liquid.

Therefore, depending on the soil quality, the guider 46 may be disposed on the front side as in FIG. 6 or may be disposed on the rear side as in FIG. 8, and when the lead steel pipe 10 is pressed into the excavation hole 1 According to the position of the guider 46, the front cover 47 or the rear cover 48 covers and protects each guide hole 43, 44, so that the inflow of soil into the guide hole 43, 44 is always maintained. can be blocked

On the other hand, as shown in FIGS. 4 and 10, recessed concave grooves 423 and 461 are formed on the front surfaces of the guiders 42 and 46, and these grooves 423 and 461 are the guiders 42, 46) and when the grouting liquid located in the space between the outlet side of the injection space 31 is pushed and moved by the grouting liquid sprayed from the injection hole 20, it is more easily separated from the guiders 42 and 46 This is to guide the injection to move upward.

On the other hand, the grouting liquid injection structure improvement type steel pipe press-fitting device according to the present invention further comprises a clean means (50),

The cleaning means 50 is

As shown in Figure 9,

It is for removing foreign substances remaining in the outlet of the injection hole 20 and its surrounding area while receiving power from the driving unit 49 and moving back and forth,

'L'-shaped bracket 51 seated on the upper end of the guider 46 of the second injection amount adjusting means 40B,

A plate 52 horizontally extending forward from the lower end of the bracket 51, and

An iron brush (53) provided on the lower surface of the plate (52)

is made including

At this time, since the bracket 51 is detachably coupled to the upper end of the guider 46 by a bolt or the like, the clean means 50 can be mounted and used only when removing foreign substances.

Accordingly, as the brush 53 is moved back and forth by the driving unit 49 and the spray hole 20 and its surrounding area are cleaned, foreign substances are removed and the clogging of the spray hole 20 can be eliminated. .

In the above description of the present invention, with reference to the accompanying drawings, "a grouting liquid injection structure improvement type steel pipe press-fitting apparatus" having a specific shape and structure has been mainly described, but the present invention is capable of various modifications and changes by those skilled in the art, and such Modifications and variations should be construed as falling within the protection scope of the present invention.

A: Steel pipe press-fitting device
1: excavator
10: lead steel pipe
11: body
111: first supply line
112: relay member
113: second supply line
20: spray hole
30: guide cap
31: injection space part
32: guide wing
33 : slope
34: concave groove
40A: first injection amount control means
41 : recess
42 : guider
421: powder
422: Volt
423: home
40B: second injection amount control means
43: first guide hole
44: second guide hole
45: load
46 : guider
461: home
47: front cover
48: rear cover
49: drive unit
491: piston
492: pneumatic cylinder body
50: clean means
51: bracket
52: plate
53 : brush

Claims (7)

a fresh steel pipe 10 press-fitted into an excavation hole 1 formed in the ground;
an injection hole 20 formed at the front end of the lead steel pipe 10 press-fitted; and
The guide cap ( 30);
The grouting liquid, which is pressurized to the injection hole 20, including
The first injection amount adjusting means 40A or the second injection amount adjusting means 40B for controlling the injection amount of the grouting liquid injected from the outlet side of the injection space 31 of the guide cap 30 to the excavation hole 1 side Grouting liquid injection structure improvement type steel pipe press-fitting device, characterized in that it further comprises.
delete The method of claim 1,
The first injection amount adjusting means (40A) is
Two or more recesses 41 formed along the outer circumferential surface of the lead steel pipe 10 and disposed rearwardly spaced apart from the exit side of the injection space 31 of the guide cap 30;
An annular guider 42 that is inserted and mounted in one of the recesses 41 and is erected to protrude outward and faces the outlet side of the injection space 31 of the guide cap 30 . )
Grouting liquid injection structure improvement type steel pipe press-fitting device, characterized in that consisting of.
The method of claim 1,
The second injection amount adjusting means (40B) is
A first guide hole 43 formed to be vertically penetrating on the outer circumferential surface of the lead steel pipe 10 and disposed rearwardly spaced apart from the exit side of the injection space 31 of the guide cap 30;
a second guide hole 44 disposed in an area vertically facing the first guide hole 43 while vertically penetrating the outer circumferential surface of the lead steel pipe 10;
a rod 45 disposed to pass through each of the guide holes 43 and 44;
An annular guider (46) facing the outlet side of the injection space (31) of the guide cap (30) while connecting the upper and lower ends of the rod (45);
a front cover (47) extending forward from the guider (46) to cover a portion of the outer peripheral surface of the lead steel pipe (10);
a rear cover 48 extending rearward from the guider 46 and disposed on the same straight line as the front cover 47 to cover the guide holes 43 and 44;
A driving unit 49 for moving the guider 46 forward and backward.
Grouting liquid injection structure improvement type steel pipe press-fitting device, characterized in that consisting of.
5. The method according to claim 3 or 4,
Grouting liquid injection structure improvement type steel pipe press-fitting device, characterized in that recessed concave grooves (423, 461) are formed on the front surfaces of the guiders (42, 46).
5. The method of claim 4,
Grouting liquid injection structure, characterized in that it further comprises a cleaning means (50) for receiving power from the driving unit (49) and moving back and forth while removing foreign substances remaining at the outlet of the injection hole (20) and the surrounding area thereof. Improved steel pipe press-fitting device.
5. The method of any one of claims 1 or 3 or 4,
In the guide cap 30, the rear end adjacent to the injection hole 20 is hinged thereto, and is pushed and opened by the grouting liquid injected toward the excavation hole 1, and then the guide blade 32 is returned to its original position by its own weight when the injection is released. ) is provided,
Grouting liquid, characterized in that a slope 33 inclined to the rear and a plurality of concave grooves 34 long in front and back are formed on the slope 33 on the inner circumferential surface of the injection space 31 of the guide cap 30 . Steel pipe press-fitting device with improved injection structure.

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