KR101518283B1

KR101518283B1 - Non spacer type Multistage Grouting Device using the Multitube

Info

Publication number: KR101518283B1
Application number: KR1020140160362A
Authority: KR
Inventors: 김동세
Original assignee: 주식회사 마성건설; 김동세
Priority date: 2014-11-17
Filing date: 2014-11-17
Publication date: 2015-05-07

Abstract

The present invention relates to a tunnel construction method and a tunnel construction method that can suppress the ground displacement at the excavation or incision site in the tunnel construction site or the urban construction site, A bundle tube having one circular pipe for a packer and at least two circular pipe for grouting side-by-side attached to each other to form a hollow portion having a closed cross-section therein; And a plurality of packers attached to the respective base members, wherein the inner surface of the base member has a plurality of circular arc grooves through which protruded outer surfaces of the bundle pipes are inserted and closely contacted, The outer surface of which is a flat cylindrical shape In the shape of; The hollow portion of the closed end face is filled with water tight material; A packing material injection hole communicating with the inside of the packer through each of the base members is provided in the circular pipe for packing, and a grout material injection hole located in only one of the grout material injection spaces is provided in each circular pipe for grouting Wherein the grout reinforcement hole has at least one of a contact point between a junction point to an adjacent circular pipe and a contact point of a common circumscribed line outside the common circumscribed line and a contact point between the circular pipe adjacent to the both sides, And is located in one place.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-stage integrated multi-tube grouting apparatus,

The present invention relates to a tunnel construction method and a tunnel construction method that can suppress the ground displacement at the excavation or incision site in the tunnel construction site or the urban construction site, &Lt; / RTI >

The construction of tunnels and large-scale underground structures has been greatly increased due to the problem of traffic accidents due to population increase in the city, the improvement of urban aesthetics, and the maximization of the land utilization rate. As a result, The construction conditions such as the prevention of damage to the building have been getting worse. However, due to the continuous occurrence of various safety accidents, safety construction is more demanded than ever before.

On the other hand, the strength of the ground depends on the composition of the soil, the size, the porosity, the water content, the joint characteristics of the rock, and the weathering degree. If the ground is not strong or the groundwater level is high, In case that the adjacent building is damaged due to the loosening of the ground due to the excavation, it is general that the auxiliary method for stabilizing the ground is performed together with the excavation method for constructing the structure.

The most common of these auxiliary methods is an injection method in which an aqueous chemical liquid or the like is injected into the ground. Although the above-mentioned injection method can expect an order effect, the effect of reinforcing the ground can not be expected. There are many limitations in the application of the tunnel construction.

Among the methods developed to overcome the above problems, there is a steel pipe multi-stage grouting method, which comprises: (1) piercing the ground, (2) drilling a steel pipe having injection holes at regular intervals, Coking the outer wall of the steel pipe between the outer wall and the perforation hole to prevent leakage of the groundwater, drainage of the gravel and backflow of the injection material, and (4) injecting the material only within a limited range while preventing the backflow of the injection material. A step of injecting a sealing material between the outer wall of the steel pipe and the perforation hole, (5) a step of installing a packer inside the steel pipe, and (6) a step of injecting the grout material through the injection hole set by the packer.

In the above-mentioned multi-step grouting method, a grooved material is used to form a beam structure integrally formed with a steel pipe and its surrounding soil so as to have a bending stiffness, thereby supporting an upper load and dispersing the earth pressure, It is a very advantageous construction method because it increases the stability.

However, since the sealing material injected between the outer wall of the steel pipe and the perforation hole is bulky and does not leave a space, and the cementation strength is not too high, the cementitious material and the bentonite are mixed so as to penetrate the sealing material and spread widely in the ground. In order to exhibit the above-described function, the cementing time is required to be about 12 hours. Since the filling material is sequentially injected into each of the compartments defined by the packers, the construction time becomes long.

Therefore, various attempts have been made to research and develop a grouting apparatus capable of shortening the air while increasing the bending stiffness. One of the examples is disclosed in U.S. Patent Application Publication No. 10-2007-0033405 entitled " Grouting System Using Groove- Device and a ground reinforcement method using the same have been proposed

As shown in FIG. 1, the above-mentioned ground reinforcement apparatus comprises three or four steel pipes bundled together into a bundle steel pipe by bundling them together through a steel pipe bundling member, thereby improving the bending stiffness and simultaneously shortening the air flow .

However, in the ground reinforcement device 50 of the above-mentioned Japanese Patent Application Laid-Open No. 2007-0033405, when the spray hole 51a formed toward the forward direction outside the steel pipe 51 faces the inner surface of the hole H, In order to solve the problem that the injection hole is difficult to spray due to the airtight seal 51a being sealed, a spacing member 52 having various shapes is provided on the outer side of the steel pipe 51, There is a problem in that the size of the perforation hole H must be further enlarged. Further, when the injection material is simultaneously injected into the entire space of the perforation hole H, There is a possibility that the caulking material may be blown out. The injection material instantaneously injected due to the difference in the distance of the injection holes 51a provided in the respective steel pipes 51 is injected depending on a part of the injection holes 51a located at the shortest distance To thereby cause a problem that has not let go juipjae spread evenly throughout.

Figure 2 shows another prior art grouting device. FIG. 2 is an embodiment of the invention, entitled " Reinforcement Grouting Device " of Patent Registration No. 10-0933230, which comprises a tubular body having a predetermined length, a coupling hole formed along the longitudinal direction at its center, A space between the inner circumferential surface of the body and the engaging holes is divided into the same shape through a plurality of partition walls formed along the longitudinal direction, and one packer grout material injection hole 12 in which a spray hole is perforated at a certain point and a plurality of grout materials A grouting pipe (10) having an injection hole (14) formed therein; A packer which is connected to the ejection holes 24a communicating with the packer grout re-injection holes 12 and is expanded and brought into close contact with the perforation holes; A spacer 20 which is connected to the grouting hole 24a communicating with the grouting material injection hole 14 so as to be dispersed in the forward direction and is sprayed from the grouting hole 24a, )Wow; A sealing member coupled to one end of the grouting pipe 10 to close the end of the grouting pipe 10 and a sealing member connected to the other end of the grouting pipe and corresponding to the packer grout re-injection hole 12 and the grout material injection hole 14, respectively And a coupling member provided with an injection nozzle to which the injection nozzle is attached.

The 'reinforcing grouting device' of the registered patent publication No. 10-0933230 is characterized in that a compartment is formed by a predetermined section with respect to all the perforation holes, and the pressing force is dispersed and uniformly filled with grout material. Thus, in Patent Document 10-2007-0033405 It is possible to reinforce the ground efficiently as compared with the ground reinforcing apparatus. However, the grouting pipe (not shown) having a shape in which the packing grout re-injection hole 12 and the grout re- 10) is inevitably manufactured by a draw-forming method, and as described in the specification, it is not possible to use an inexpensive general steel material and is limited to an expensive aluminum material, so that the cost is greatly increased, and the elastic modulus The low-grade aluminum grouting tube is not very high in bending stiffness, It is difficult to expect a larger effect of the beam that acts as an important factor.

Furthermore, as in the case of the reinforcing grouting device of Patent Registration No. 10-0933230, as in the case of the ground reinforcement device of Japanese Unexamined Patent Application Publication No. 10-2007-0033405, the grout material injection hole provided outside the grouting pipe is an inner surface of the perforation hole There is still a problem of increasing the fabrication cost and increasing the size of the perforation hole in that the spacer is placed in order to solve the problem of being sealed.

KR 10-2007-0033405 A KR 10-0933230 B1 KR 10-1234814 B1 KR 10-1045727 B1

The present invention overcomes the material limit to the grouting pipe, increases the bending stiffness through the structural shape, increases the fabrication and the workability by omitting the spacers such as spacers, and does not use the sealing material to shorten the air The present invention has been made in view of the above problems.

According to a preferred embodiment of the present invention for solving the above-mentioned problems, a bundle tube for one of a packer circular pipe and at least two or more grouting round pipes is laterally attached to each other to form a closed hollow section, A plurality of base members installed at regular intervals surrounding the bundle tube and forming a multi-stage grout material injection space, and a plurality of packers attached to the respective base members, A plurality of circular arcs in which protruded outer surfaces of the protruded outer surfaces of the protrusions are in close contact with each other, and the outer surface of the protrusions has a flat cylindrical shape; A packer protector 310 having a band-shaped protrusion 311 protruded from the outer surface of the packer 300 is fitted to the front end of the base member 200. The hollow portion of the closed end face is filled with water tight material; A packing material injection hole communicating with the inside of the packer through each of the base members is provided in the circular pipe for packing, and a grout material injection hole located in only one of the grout material injection spaces is provided in each circular pipe for grouting Wherein the grout reinforcement hole has at least one of a contact point between a junction point to an adjacent circular pipe and a contact point of a common circumscribed line outside the common circumscribed line and a contact point between the circular pipe adjacent to the both sides, The multi-step integral multi-tube grouting apparatus is provided.

According to another embodiment of the present invention, there is provided a multi-stage integral multi-tube grouting apparatus free of spacers, characterized in that all grout reinforcement holes are provided between the junction and the contact point of the round steel pipe for grouting.

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According to another embodiment of the present invention, both ends of the base member are provided with ring grooves, and both ends of the packer are inserted into the ring grooves, and then the engaging bands are inserted into the ring grooves, Wherein the multi-step integral multi-tube grouting apparatus is provided with a separating member.

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According to another embodiment of the present invention, the base member 200 is provided with ring grooves at both ends thereof, and a packer protector 310 having an insertion protrusion 312 formed on the inner side of the base member 200 is inserted, Characterized in that the packer is attached to the base member by inserting both ends of the packer into the ring groove and then fitting the coupling band into one ring groove and fitting the insertion protrusion of the packer protector into the other ring groove. An integrated multi-tube grouting device is provided.

According to another embodiment of the present invention, the rear end of the bundle tube further includes a connection socket for connecting a supply pipe for supplying a packing material or a grout material to each of the round steel tubes of the bundle tube, A first socket integrally formed with the bundle tube while receiving an end of the bundle tube; a second socket integrated with the supply tube while receiving each end portion of the supply tube; and a watertight seal fitted between the first and second sockets Characterized in that the first socket and the second socket are coupled by bolting each of the fastening portions by attaching fastening portions each having a bolt hole in the first socket and the second socket. A multi-stage integral multi-tube grouting apparatus is provided.

According to another embodiment of the present invention, a receiving groove is provided at the other end of the first socket, a water-tight elastic member is inserted into the receiving groove, and a through-hole corresponding to each circular steel pipe of the bundle tube is formed And each of the supply pipes contacting the through holes is accommodated in the second socket in such a manner as to be gradually spaced apart from each other.

The grouting apparatus according to the present invention can use an ordinary steel pipe and can be manufactured economically, and by forming a plurality of round steel pipes as a bundle pipe, the sectional modulus is increased to greatly increase the bending stiffness.

Further, since the grouting apparatus according to the present invention does not require the installation of spacers, it is possible to reduce the manufacturing cost and minimize the size of the perforation holes, thereby improving the economical efficiency and the workability.

Further, since the grouting apparatus according to the present invention does not require a time for cementing the sealing material, it is possible to simplify the construction and to shorten the air.

Further, since the grouting apparatus according to the present invention grout only individual sections set in multiple stages, it is possible to uniformly inject the grout material as a whole, thereby improving the quality of construction.

1 is a perspective view and a sectional view for explaining a ground reinforcing apparatus according to the prior art.
2 is a perspective view and a cross-sectional view of another conventional grouting apparatus for reinforcement.
3 is a perspective view showing the entire grouting apparatus according to an embodiment of the present invention.
Fig. 4 is a cross-sectional view taken along line AA and BB in Fig. 3;
5 is a perspective view illustrating a structure of a base member according to an embodiment of the present invention.
6 is an explanatory view showing a process of installing a packer on the base member shown in Fig.
7 is a perspective view showing each embodiment of the packer guard of the present invention.
Fig. 8 is an explanatory view showing a function of the packer installed in the base member of the present invention. Fig.
FIG. 9 is a cross-sectional view showing a location where a grout re-injection hole is installed with respect to the configuration of various bundle tubes that can be practiced by the present invention.
10 is a perspective view and a cross-sectional view illustrating a state where a bundle pipe and a supply pipe are connected to a connection socket of the present invention.
11 is a perspective view of the connection socket shown in Fig. 10; Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to obscure or obscure the technical idea of the present invention due to the detailed description of the known structure in describing the present invention, the description of the structure of the above known structure will be omitted.

FIG. 3 is a perspective view showing the entire grouting apparatus according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line A-A and B-B in FIG.

3, the grouting apparatus according to the present invention includes a bundle tube 100 serving as a channel and a nozzle for injecting a packing material or a grout material into the packer 300 or the perforation hole H, A plurality of base members 200 installed on the outer surface of the bundle pipe 100 at intervals and a plurality of packers 300 attached to the base member 200.

As shown in FIG. 4 (a), the bundle pipe 100 is formed by side-attaching one round pipe section 110 for a packer and at least two rounding steel pipes 120 for grouting, And a hollow portion 130 of a closed cross section surrounded by the circular steel pipe is formed at the center.

The number of the circular steel pipes 120 for forming the bundle pipe 100 varies depending on the length of the grouting (the length of the bundle pipe or the length of the perforation hole) and the installation interval of the packer 300, The most common case is when the grouting length (the length of the bundle tube) is set at about 12M and the packer 300 is installed at an interval of 3M. In this case, as shown in each drawing, The circular steel pipe 110 and the four rounding steel pipes 120 for grouting are joined together to form one bundle pipe 100.

As described above, since the bundle tube 100 formed of a plurality of three or more circular steel tubes has a larger sectional modulus than that of forming a single large-diameter steel tube or forming a partition wall in the prior art, So that a strong beam action can be expected.

The bundle tube 100 composed of a plurality of circular steel tubes as described above is provided with a base member 200 surrounding the same. The base member 200 facilitates the installation of the packer 300 and allows the packer 300 to be operated efficiently.

There are various methods such as a method of attaching the packer 300 to the base member 200, but most preferably, the binding band 212 is used. The coupling band 212 may be a ring-shaped coupling unit using an elastic force, or may be coupled by tightening a band using a separate coupling unit.

5 shows a structure of a base member 200 of an embodiment in which a packer 300 can be installed using a coupling band 212. Figure 6 shows a structure in which a packer 300 is coupled to the base member 200 The process of being installed by the band 212 is described.

As shown in FIG. 5, when the base member 200 is coupled, the outer surface of the base member 200 is formed of a pair of split pieces so as to have a flat cylindrical shape, and band grooves 211 are formed on the outer surfaces of the both end portions. 6, after both ends of the packer 300 are inserted into the band groove 211 of the base member 200, the coupling band 212 is inserted into the band groove 211 The packer 300 is simply attached to the base member 200. [

The packer 300 attached to the base member 200 has the bottom surface of the packer 300 adhered to the flat surface of the base member 200 when the volume of the packer 300 is expanded by the injection of the packing material into the base member 200 And the packer 300 is completely free from the gap.

In addition, the base member 200 can secure the integrity of the bundle tube 100 to reinforce the rigidity thereof and allow the grout material to flow between the respective grout material injection spaces 220 to be described later through the joining portions of the respective round steel tubes And to eliminate the possibility of occurrence of gaps.

To this end, the inner surface of the base member 200 has a shape in which a plurality of arcs in which the protruding outer surface of the bundle tube 100, that is, the protruding surface of the circular steel tube,

The base member 200 is installed at regular intervals with respect to the longitudinal direction of the bundle pipe 100 to form a plurality of grout material injection spaces 220 between the base members 200, The packers 300 installed in the grout 300 form partition walls so that the respective grout re-injection spaces 220 become independent closed spaces. The concrete installation intervals of the base member 200 to the packer 300 are determined in consideration of the permeability coefficient of the ground, the joint characteristics of the rock, and the like.

The packer 300 installed in the base member 200 is made of a flexible synthetic resin or cloth so that expansion can be easily performed. During the process of inserting the grouting device into the perforation hole, There is a fear that damage such as scraping and tearing of the part may occur. Therefore, a packer protector 310 for preventing damage to the packer 300 may be further provided at the tip of the base member 200.

7 is a perspective view and a cross-sectional view of each embodiment of the packer guard 310 described above.

The packer protector 310 is band-shaped and protrudes from the outer surface of the packer 300 by being fitted to the front end of the base member 200. A vertical film 311 is formed on the front surface of the packer protector 310, 310 are not pushed toward the packer.

The packer protector 310 may be provided separately from the coupling band 212 for fixing the packer 300 as shown in FIG. 7 (a) The insertion protrusion 312 inserted into the band groove 211 may be formed so that the insertion protrusion 312 also functions as the coupling band 212 so that the installation of the one coupling band 212 may be omitted.

The material of the packer protector 310 is not particularly limited. However, when the insertion protrusion 312 is formed to serve also as the function of the coupling band 212, it is preferable to use a material capable of having some degree of elasticity Lt; / RTI >

Fig. 8 illustrates the operation of the packer 300 installed in the base member 200 of the bundle 100. Fig.

8A, a packing material injection hole 111 communicating with the interior of the packer 300 is provided through the base member 200, as shown in FIG. 8A. The packing material pressurized and supplied through the circular pipe for packing 110 is filled in the packing material 300 through the packing material injection hole 111 to expand the packing material 300, The partition wall is formed between the outer surface of the bundle pipe 100 and the perforation hole H. As the packing material, a tentative cement milk, a water glass of a cement suspension, or the like is used.

Meanwhile, in the bundle pipe 100, a plurality of circular steel pipes are laterally attached to each other. Specifically, when all the side faces between the circular steel pipes are welded, deformation may occur in the steel pipe, May be attached to each other.

Therefore, there is a possibility that a gap, which is communicated with the hollow portion 130 of the closed end face, occurs at a portion of the welded portion of the round steel tubes where welding is not performed, and this gap forms a leakage path of the grout material. In order to prevent leakage of the grout material, the hollow portion 130 of the bundle 100 is filled with the water retaining material 131 in the present invention.

The water pouring material 131 to be filled in the hollow part 130 is not particularly limited as long as it has sufficient water tightness without being easily shrunk by pressing. It may be a synthetic resin such as silicone or foamed urethane, And the like.

In the case of using the non-shrinkage mortar as the water-holding material 131 to be filled in the hollow portion 130, since the non-shrinkage mortar is restrained by the round steel pipe, the flexural stiffness of the bundle pipe 100 like a CFT (Concrete Filled Steel Tube) It is possible to expect a further strengthening effect.

As described above, when each independent closed space is formed for the multi-stage grout material injection space 220 formed between the bundle pipe 100 and the inner surface of the perforation hole H by expanding the packer 300, The grout material pipe 120 is provided with a grout material injection hole 121 located in one of the closed spaces, that is, only one of the grout material injection spaces 220 . Therefore, the grout material can be injected into only one closed space through one rounding steel pipe 120 for grouting, so that the grout reinforcement can be performed sequentially or simultaneously at all times with a stable pressing force.

On the other hand, the bundle pipe 100 is placed on the lower surface of the perforation hole H, where the grouting reinforcement is for reinforcing the soft soil, so that the inside of the perforation hole H is easily collapsed, The bottom surface of the bundle pipe 100 may be in contact with the bottom surface of the hole H in the perforation hole H even if the spacer is provided as in the prior art.

When the grout re-injection hole 121 is located at a position where the vertical load due to the own weight of the bundle 100 is received while being in contact with the bottom soil inside the perforation hole H, the vertical load is the injection pressure of the grout material Thereby preventing effective injection of the grout material.

Therefore, the grout re-injection hole 121 of the present invention is in a position not in contact with the lower surface of the perforation hole H, and even if it faces the accumulated soil, the vertical load due to the self weight of the bundle tube 100 can not be applied By placing the grout material at a position where the reduction of the injection pressure of the grout material can be minimized, the grout material can be efficiently injected, and spacers and the like can be omitted.

FIG. 9 shows positions where grout re-injection holes 121 for achieving the above-described effects can be installed with respect to the configurations of the various bundle pipes 100.

That is, in the grouting apparatus according to the present invention, the grout reinforcement hole 121 provided in the grouting round steel pipe 120 is formed by a joint point a with respect to the adjacent circular steel pipe and a common circumscribed line L (B) between the contact point (b) and the circular bore (b) adjacent to both sides.

However, even if the bundle pipe 100 is brought into contact with the inner bottom surface of the perforation hole H, grout material is provided between the junction points a and b such that the grout material can be spread in all directions of the perforation hole H. [ It is preferable that all of the injection holes 121 are provided.

The grouting apparatus of the present invention may further include a connection socket 400 for connecting the bundle tube 100 to the supply tube S. [ 10 is a perspective view and a cross-sectional view showing a state in which the bundle 100 and the supply pipe S are connected by the connection socket 400, and FIG. 11 is an exploded perspective view of the connection socket 400.

10, the connection socket 400 includes an inner socket 410 integrated with the bundle tube 100 at a rear end portion of the bundle tube 100, And a watertight elastic member 430 sandwiched between the inner socket 410 and the outer socket 420. The watertight elastic member 430 is provided with a bundle tube 100, The through holes 431 corresponding to the respective round steel pipes of FIG.

The supply pipe S supplies a packing material or a grout material to each circular pipe of the bundle pipe 100 and communicates with the circular pipe through a through hole 431 of the water-tight elastic member 430.

The ends of the supply pipes S are accommodated in the outer socket 420 and preferably the supply pipes S contacting the respective through holes 431 are accommodated in such a manner as to be gradually spaced from each other. The spaced-apart configuration for the supply tube S facilitates the filling operation of the packing material or grout material.

The inner socket 410 is configured such that one end thereof receives the end of the bundle tube 100 and the other end thereof has a receiving groove 411 so that the water-tight elastic member 430 can be inserted.

In addition, bolts are fastened to the inner socket 410 and the outer socket 420 by attaching the fastening portions 412 and 422 having bolt holes, respectively, and fastening the fastening portions 412 and 422 to the inner socket 410 and the outer socket 420 are coupled.

The connection socket 400 according to the present invention, in which the circular pipe and the supply pipe S of the pipe bundle 100 are fastened together with the water-tight elastic member 430 interposed therebetween, S, it is possible to facilitate the desorption operation and smoothen the end of the bundle pipe 100 so that the progress of the subsequent excavation work can be smoothly continued.

The end of each steel pipe constituting the bundle pipe 100 is formed in a closed structure and a finishing cap 320 for forming the closed structure or protecting the closed end is further provided at the tip of the bundle pipe 100 And the finishing cap 320 may be sharpened so that the leading end of the finishing cap 320 can be inserted into the grouting apparatus more easily.

The grouting reinforcement operation according to the present invention has been described as follows: i) the ground is punctured by using a perforator in the field surface, and then the perforation hole (H) is subjected to the grouting according to the present invention (Ii) expanding the packer 300 by pressurizing and injecting the packing material through the circular steel pipe 110 for packing, thereby forming a multi-stage closed space formed between the outer surface of the bundle tube 100 and the perforation hole H (Iii) applying grout material to each of the closed spaces through respective grouting round steel pipes 120 to perform grouting with respect to surrounding gravels, and iv) when the curing of the grout material is completed, And removing the connection pipe S by removing the connection socket 400 installed at the rear end of the connection socket 400. [

It is preferable that the pressing force for injecting the packing material of the step ii) into the packer 300 is set to be larger than the pressing force for injecting the grout material of the step iii) into the closed space, For example, 10 to 20 minutes. It is preferable that the grout material be injected in a state where the pressure applied to the packer 300 is maintained at this time.

Also, the grout re-injection in step iii) may be performed sequentially for each of the closed spaces of the multi-stages, but it is also possible to simultaneously perform the grout re-injection operation for all of them.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

100; Bundle tube 110; Round pipe for packer
111; Packing re-injection hole 120; Round steel pipe for grouting
121; Grout re-injection hole 130; Hollow portion
131; A water material 200; Base member
211; Ring groove 212; Coupling band
220; Grout reinjection space 300; Packer
310; Packer guard 311; A membrane jaw
312; An insertion protrusion 320; Closing cap
400; Connection socket 410; My socket
411; Receiving grooves 420; Outer socket
430; Watertight elastic member 431; Through-hole
412, 422; The fastening portion

Claims

A bundle tube 100 in which one packer round steel pipe 110 and at least two or more grouting round steel pipes 120 are laterally attached to each other to form a hollow section 130 having a closed cross section, A plurality of base members 200 and a plurality of packers 300 attached to each of the base members 200 to form a multi-stage grout re-injection space 220 while being installed at regular intervals around the base member 200 Lt; / RTI >
The base member 200 has a cylindrical shape having an outer surface formed in a continuous shape with a plurality of circular arcs on the inner surface of which the protruded outer surface of the bundle tube 100 is inserted and attached,
A packer protector 310 having a band-shaped protrusion 311 protruded from the outer surface of the packer 300 is fitted to the front end of the base member 200.
The hollow portion 130 of the closed end face is filled with the water retainer 131;
The packer circular pipe 110 is provided with a packing material injection hole 111 communicating with the interior of the packer 300 through each of the base members 200. Each circular pipe 120 for grouting Grout re-injection holes 121, which are located only in one of the grout re-injection spaces 220,
The grout reinforcement hole 121 is formed between the junction point a of the adjacent circular steel pipe and the contact point b of the common circumscribed line L located outside the common circumscribed line L, (B) between the contact points (b). The multi-step integrated bare tube grouting apparatus according to claim 1,

The multi-step integral type pipe according to claim 1, characterized in that grout reinforcement holes (121) are provided between the joining points (a) and (b) of the rounding steel pipe (120) Bundle grouting device.

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The battery pack according to claim 1, wherein a band groove (211) is provided at both ends of the base member (200), and both ends of the packer (300) are inserted into the band groove (211) Wherein the packer (300) is attached to the base member (200) by being fitted in the band groove (211).

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The apparatus according to claim 1, wherein a band groove (211) is provided at both ends of the base member (200), and a packer protector (310) having an insertion protrusion (312) And both ends of the packer 300 are inserted into the band groove 211 and then the coupling band 212 is inserted into the band groove 211 of one side and the packer protector 310 Wherein the packer (300) is attached to the base member (200) by fitting the insertion protrusion (312) of the packing member (300).

The connecting socket (400) for connecting a supply pipe (S) for supplying a packing material or a grout material to each round steel pipe of the bundle pipe (100) is provided at the rear end of the bundle pipe The connection socket 400 further includes an inner socket 410 having one end integrated with the bundle 100 while accommodating the end of the bundle tube 100, And a watertight elastic member 430 interposed between the inner sockets 410 and the outer sockets 420. The inner sockets 410 and the outer sockets 420 The inner socket 410 and the outer socket 420 are coupled by fastening the fastening portions 412 and 422 provided with the bolt holes to the fastening portions 412 and 420 respectively and fastening the fastening portions 412 and 422 to the bolts. Multistage integral multi - tube grouting device.

The waterproof elastic member (430) according to claim 7, wherein a receiving groove (411) is provided at the other end of the inner socket (410) to insert a watertight elastic member (430) The through holes 431 corresponding to the respective round steel pipes of the main body 100 are formed and the respective supply pipes S contacting the respective through holes 431 are accommodated in the outer socket 420 in such a manner as to be gradually spaced from each other A multi-step integral multi-tube grouting device without a spacer.