KR101770381B1 - Mortar injection method for sleeve joint - Google Patents

Abstract

The present invention relates to a method of injecting mortar in the process of forming a sleeve joint in a precast concrete method. Mortar is injected in the process of forming a sleeve joint by inserting an overhanging reinforcing bar protruding from the other structure or a second precast unit into a sleeve formed on a first precast unit. The mortar injection method for a sleeve joint comprises: a gap filling process of installing a temporary shield around a gap between the first precast unit and the other structure or the second precast unit and injecting mortar into the gap; and a sleeve filling process of injecting mortar into the sleeve of the first precast unit into which the overhanging reinforcing bar is inserted. The gap filling process and the sleeve filling process are separated and individually performed. The present invention separates and individually performs the process of filling the gap formed between the precast unit and the structure and the process of filling the sleeve into which the overhanging reinforcing bar is inserted to perform only necessary process first and prevent the delay of the unnecessary construction, if the gap needs to be filled first because of the need for further modification of verticality, or if the sleeve needs to be filled first because of additional construction.

Description

[0001] MORTAR INJECTION METHOD FOR SLEEVE JOINT FOR MALE INJECTION [0002]

The present invention relates to a method of injecting mortar, and more particularly, to a method of injecting mortar in a process of forming a sleeve joint in a precast concrete method.

Generally, the precast concrete method is a method in which a column, a beam, and a slab, which are the main constituent elements of a building, are manufactured in the form of a unit unit in advance in a factory and the precast unit is brought into the field, It is a construction method to construct a building.

This precast concrete method can minimize construction work, improve construction efficiency, reduce the construction period drastically, and secure a certain quality. Therefore, recently, there is a tendency that the construction to be applied by the precast concrete method is rapidly increasing. Especially, in the case of a parking lot having a large usage load and a frame construction having a large logistics structure.

In this precast concrete method, a mechanical joint process for continuously connecting reinforcing bars between an installation part of a floor or the like and a precast unit or between a precast unit and precast units is performed in the field for structural stability.

The mechanical joining method of the reinforcing bars is applied to coupler joints using couplers, weld joints for welding reinforcing bars, and sleeve joints for fixing reinforcing bars by inserting reinforcing bars into the sleeves.

The double sleeve joint is performed by inserting a reinforcing bar into a sleeve space called a splice sleeve and injecting mortar or the like around the reinforcing bar to harden the reinforcing bar. Respectively.

7 is a view for explaining a sleeve formed at a lower end of a precast concrete column.

The reinforcing bars 110 are positioned in the precast concrete columns 100 and the sleeves 120 connected to the reinforcing bars 110 are formed at the lower ends of the precast concrete columns 100 as needed. The reinforcing bars protruding from the floor or other precast units are inserted into the sleeve 120 and then hardened by injecting no shrinkage mortar so that the reinforcing bars 110 of the precast concrete column 100 are mechanically joined with each other do. At this time, the injection port 122 and the discharge port 124 for injecting the non-shrinkable mortar are connected to the outside of the precast concrete column 100 in each of the sleeves 120 formed in the precast concrete column 100. At this time, in order to completely fill the sleeve 120, the injection port 122 is located below the discharge port 124, and the non-shrinkable mortar injected through the injection port 122 fills the sleeve 120 and the upper discharge port 124, And shrink-free mortar is injected until it is discharged to the outside.

8 is a view for explaining a method of injecting non-shrinkable mortar in a conventional sleeve joining process.

And the precast concrete column 100 is installed on the floor 200. The lower surface of the precast concrete column 100 and the lower surface of the precast concrete column 100 are not positioned in contact with the floor 200 in consideration of the verticality of the precast concrete column 100 and the error of the contact surface, 200 are spaced apart from each other. The gap 220 between the lower surface of the precast concrete column 100 and the floor 200 is filled with the non-shrinkage mortar in the process of joining the sleeves. The gap between the lower surface of the sleeve 120 and the lower surface of the precast concrete column 100, 200 is completely filled with the non-shrinkable mortar and hardened, the installation is completed with the complete structure. In order to support the load of the precast concrete column 100 while maintaining the gap in the installation process through the sleeve joint, it is necessary to precisely measure and accurately measure the position and height at which the precast concrete column is to be installed, The pedestal 222 is positioned in the vicinity of the exiting reinforcement 210 projected from the floor 200 and no shrinkage is formed around the gap 220 between the lower surface of the precast concrete column 100 and the floor 200 A temporary membrane 230 is provided to prevent the outflow of the mortar. At this time, the precast concrete column 100 is positioned by aligning the vertical position with the pedestal 222 being disposed, and the inclined brace 240 for temporary fixing is installed, and the installation is completed by the injection of the non-shrinkable mortar The load of the precast concrete column 100 is supported.

When the shrinkable mortar is injected by connecting the hose 910 connected to the external mixer and the pressurizer 900 to the injection port 122 of the sleeve 120, Is filled upwards from the gap and filled up to the upper sleeve 120 after all the gaps between the gaps have been filled.

At this time, generally only one of the injection ports 122 formed in each of the plurality of sleeves 120 is opened for injection, and the remaining injection ports are temporarily blocked with a stopper 123 and the mortar is injected through one injection port. Shrinkable mortar is discharged from the discharge port 124 around the injection port when the injected non-shrinkage mortar fills all the gap between the bottom surface of the precast concrete column 100 and the bottom 200 and is filled up to the top of the sleeve 120. The mortar injection operation is completed while closing the outlet port 124 in order to prevent air from entering into the discharged sleeve outlet 124, closing all the exhaust ports, closing the injection port 122 to which the hose is connected.

However, since injection of the mortar for such a conventional sleeve joint has to fill the gap between the bottom surface of the precast concrete column 100 and the bottom 200 and all the sleeves, it is possible to change the injection process There is a drawback that it can not be done.

Korean Patent No. 10-0937745

It is an object of the present invention to provide a mortar injection method capable of changing an injection process according to various situations in a field during a mortar injection process for sleeve coupling.

According to another aspect of the present invention, there is provided a method of injecting mortar in a process of forming a sleeve joint in a precast concrete method, the method comprising the steps of: Wherein the temporary casting is installed around a gap between the first precast unit and the other precast unit or between the first precast unit and the second precast unit, A gap filling process to inject mortar into the gap; And a sleeve filling step of injecting a mortar into a sleeve of the first precast unit into which the reinforcing bars are inserted, wherein the gap filling step and the sleeve filling step are performed separately from each other.

In the specification of the present invention, a precast unit is used as a term including both a precast concrete column, a precast concrete wall, and a precast structure such as a precast concrete beam.

The present invention can selectively apply the sequence of performing the gap filling process first, performing the sleeve filling process later, performing the sleeve filling process first, and performing the gap filling process thereafter.

Conventionally, since the gap between the precast unit and the structure and the process of filling the mortar with the sleeve into which the reinforcing bars are inserted are continuously performed without being separated from each other, If necessary, the mortar injection process for the precast unit can not be performed until these are solved, and there is a problem that the air is lengthened.

In the present invention, the process of filling the mortar between the pre-cast unit and the structure and the process of filling the mortar with the reinforcing bar in the sleeve are separately performed, so that if further correction of the verticality is required, The first step of filling mortar between the first and second reinforcing bars is first performed. In the case where additional work is required on the floor, the order of filling the mortar with the reinforcing bar inserted therein can be changed, have.

Specifically, the sleeve filling process can be performed by injecting an external mortar through an injection port whose one end is opened inside the sleeve formed in the first precast unit and the other end is opened to the side of the first precast unit. At this time, in order to confirm that the sleeve is completely filled, a discharge port whose one end is opened inside the sleeve at the position higher than the injection port and the other end is opened to the side of the first precast unit is formed, and the mortar injected into the injection port is discharged The outlet is closed with a plug.

In the present invention, the gap filling process can be performed by injecting mortar through the inlet formed in the temporary membrane. Further, the gap filling step is carried out through the inside of the first precast unit, and the mortar is introduced into the first pre-cast unit through the inlet path whose one end is opened to the lower surface of the first precast unit and the other end is opened to the side of the first precast unit Can be performed by injection.

In order to separate the gap filling process and the sleeve filling process from each other, a lower end stopper fitted to the outer reinforcement bar and preventing the mortar from flowing downwardly of the sleeve can be provided.

At this time, it may be a structure in which a pedestal for maintaining the interval of the gap is fitted in the reinforcing bar and the lower end of the bar is positioned on the pedestal. And at least one adjustable pedestal which can be inserted into or removed from the reinforcing bar in a state where the reinforcing bar is inserted into the sleeve and the through hole through which the reinforcing bar is inserted is formed into a shape open at one side, A structure capable of adjusting the interval of the gap by adjusting the number of the variable pedestals can be applied.

Alternatively, in the case of a steel bar having a thread formed on the outer circumferential surface thereof, it is possible to use a structure in which the lower end is fixed by using a nut fastened to the thread of the reinforcing bar.

Further, the sleeve filling process is carried out by injecting the mortar through an injection path formed through the inside of the first precast unit, one end opening into the sleeve and the other end opening to the side of the first precast unit, The injection path formed in the plurality of sleeves is opened to the same side of the side surfaces of the first precast unit so that the sleeve filling process for the plurality of sleeves can be performed on the side where the injection path is opened. A part of the space where the precast unit is installed is formed in the side direction in which the work can be performed when the working space is insufficient due to the cliff or the wall so that the sleeve filling process for all the sleeves is performed on one side.

In the present invention constructed as described above, since the process of filling the gap formed between the precast unit and the structure and the process of filling the sleeve into which the reinforcing bar is inserted are separated and individually performed, In the case where the sleeve is firstly filled because of the additional construction or the like, the unnecessary air delay can be prevented by performing only the necessary process first.

FIG. 1 is a view for explaining a mortar injection method for sleeve coupling of reinforcing bars according to an embodiment of the present invention.
FIG. 2 is a view showing the outer shape of the inlet formed in the temporary membrane in the mortar injection method for the sleeve fitting of the reinforcing bar according to the present embodiment.
3 and 4 are views for explaining another embodiment of the present invention in which mortar can be injected only into the sleeve of the precast unit.
FIG. 5 is a view showing a state in which a work is performed according to an embodiment of the present invention when a work is not performed due to a cliff left on a precast column.
6 is a view for explaining another embodiment for injecting mortar into a gap between the bottom surface and the bottom of the precast unit.
7 is a view for explaining a sleeve formed at a lower end of a precast concrete column.
8 is a view for explaining a method of injecting non-shrinkable mortar in a conventional sleeve joining process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the accompanying drawings, embodiments of the present invention will be described in detail.

Hereinafter, a case where a precast concrete column, which is one of the precast units, is installed on the floor for the convenience of explanation is explained, but the present invention is not limited thereto and even if a precast wall or the like is installed on the floor, , And precast units may be appropriately modified and applied even when they are connected to each other.

FIG. 1 is a view for explaining a mortar injection method for sleeve coupling of reinforcing bars according to an embodiment of the present invention.

The reinforcing bars 110 are positioned inside the precast concrete columns 100 as the precast unit 100 and the sleeves 120 connected to the reinforcing bars 110 are formed at the lower ends of the precast units 100 The reinforcing bars 110 of the precast unit 100 and the reinforcing bars 210 of the floor 200 are formed by injecting non-shrinking mortar after the reinforcing bar 210 protruding from the bottom is inserted into the sleeve 120, ) Is completed is the same as in the conventional case. The injection port 122 and the discharge port 124 for injecting the non-shrinkable mortar are connected to the outside of the precast unit 100 in each of the sleeves 120 formed in the precast unit 100, The injection port 122 is positioned below the discharge port 124 in order to completely fill it, as in the conventional method.

The lower surface of the precast unit 100 is separated from the floor 200 so that the lower surface of the precast unit 100 does not contact the floor 200 in consideration of the verticality of the precast unit 100, The position and height to be installed in order to support the load of the precast unit 100 while precisely maintaining the gap 220 are precisely measured and displayed in advance so that the pedestal 200 ) Is also placed in the same manner as in the conventional method.

Furthermore, in the vicinity of the gap 220 between the lower surface of the precast unit 100 and the floor 200, the provisional membrane 230 for preventing leakage of the non-shrinkable mortar is surrounded, The injection port 122 for directly injecting the mortar into the gap 220 that separates the lower surface of the precast unit 100 from the floor 200 without passing through the injection port 122 formed in the sleeve 120 of the unit 100 Is formed in addition to the temporary membrane 230 in the present invention.

FIG. 2 is a view showing the outer shape of the inlet formed in the temporary membrane in the mortar injection method for the sleeve fitting of the reinforcing bar according to the present embodiment.

As shown, by adding an entry port 232 to the temporary membrane 230 surrounding the gap 220 that separates the lower surface of the precast unit 100 from the floor 200, A gap filling step of injecting mortar only into the gap 220 that separates the lower surface of the precast unit 100 from the floor 200 may be performed by separating the sleeve from the sleeve filling step of filling the mortar with the sleeve. have. The mortar is first applied only to the gap 220 that separates the lower surface of the precast unit 100 from the floor 200 and the stability is further improved and then the precast unit 100 is adjusted again And a sleeve filling step of injecting mortar into the sleeve 120 may be performed to complete the rebar joining. At this time, if the gap between the lower surface of the precast unit 100 and the floor 200 is changed while the precast unit 100 is being repositioned by adjusting the verticality, the process of injecting the mortar into the sleeve 120 Fill the mortar. Conversely, if there is no gap between the bottom surface of the precast unit 100 and the bottom 200 while the precast unit 100 is being repositioned by adjusting the vertical orientation, the mortar may be placed between the spaced apart sleeves 120, The mortar is injected into each of the sleeves 120 to perform the sleeve filling process.

1 and 2, a description has been given of a case where a filling port is additionally formed in the temporary membrane to construct the mortar only in the gap 220 that separates the lower surface of the precast unit 100 from the floor 200. However, It may be necessary to construct the gap 220 that separates the lower surface of the precast unit 100 from the floor 200 for later construction because the construction is not finished.

1, when the mortar is injected into the sleeve 120 of the precast unit 100, the gap 220 between the lower surface of the precast unit 100 and the floor 200 is filled with mortar .

Therefore, if a structure capable of injecting mortar into the sleeve of the precast unit 100 is first added, the mortar is first injected into the sleeve 120 and fixed to the sleeve 120, Mortar can be additionally applied to the gap 220 that separates the bottom surface of the cast unit 100 from the bottom surface 200.

3 and 4 are views for explaining another embodiment of the present invention in which mortar can be injected only into the sleeve of the precast unit.

Fig. 3 is a configuration that can be applied to all reinforcing steel structures, and Fig. 4 is a configuration that can be applied when the reinforcing steel is a threaded reinforcing steel.

3 and 4, compared to the conventional mortar injection process and the first mortar injection process, the lower portion of the sleeve 120 formed in the precast unit 100 is inserted into the reinforcing bar 210 The lower end stopper 226 is additionally used.

3, a pedestal 222 for supporting a load of the precast unit 100 and maintaining a gap between the lower surface of the precast unit 100 and the floor 200, The uppermost part of the pedestal 222 is formed in the center of the through hole through which the reinforcing bar 210 passes and the remaining part of the through hole can block the lower end of the sleeve 120 The mortar injected into the sleeve 120 does not flow down into the gap 220 that separates the lower surface of the precast unit 100 from the bottom 200. [

모양으로 두껍게 제작되어, 내부의 관통공에 내민철근(210)을 끼워서 설치한 뒤에 수직도 확인 등을 위하여 내민철근(210)이 프리캐스트 유닛의 슬리브(120)에 삽입되면 제거할 수가 없다. 가변받침대(225)는 관통공을 형성하면서도 한쪽으로 개구부가 형성된

모양으로 얇게 제작되어 여러 겹으로 끼워지며, 내민철근(210)이 프리캐스트 유닛의 슬리브(120)에 삽입된 경우에도 측면의 개구부를 통해서 제거할 수 있으며, 추가로 설치하는 것이 가능하다. 이와 같이, 내민철근(210)에 여러 겹으로 설치된 가변받침대(225)의 개수를 조절함으로써, 프리캐스트 유닛(100)의 수직도를 조절할 수 있다. 그리고 가변받침대(225)는 측면으로 개구부가 형성되어 슬리브(120)를 완전히 막을 수 없기 때문에 그 위에 중앙에 관통공만이 형성된

모양의 하단마개(226)를 위치시킨다.In this embodiment, the pedestal 222 having the penetrating hole in which the reinforcing bar 210 is inserted is used. In this case, when the reinforcing bar 210 is inserted into the through hole, the fixed pedestal 224 and the reinforcing bars 210 And a variable pedestal 225 which can be removed and inserted. Specifically, the fixed pedestal 224 is formed with only a through hole at the center thereof

And can not be removed if the reinforcing bar 210 is inserted into the sleeve 120 of the precast unit for the purpose of confirming the verticality after inserting the reinforcing bar 210 in the through hole. The variable pedestal 225 is formed with a through hole,

And it is possible to remove the reinforcing bars 210 through the openings of the sides even when the reinforcing bars 210 are inserted into the sleeves 120 of the precast unit. In this manner, the verticality of the precast unit 100 can be adjusted by adjusting the number of the variable pedestals 225 that are provided in multiple layers in the reinforcing bars 210. In addition, since the variable pedestal 225 can not completely block the sleeve 120 by forming an opening at the side thereof, only the through hole is formed at the center thereof

Shaped bottom cap 226 is positioned.

모양의 하단마개(226)를 고정하고 있기 때문에, 받침대가 꼭 내민철근(210)이 끼워지는 관통공을 구비한 형태가 아니어도 되며, 종래의 일반적인 받침대를 사용할 수 있다.
As shown in FIG. 4, when the reinforcing bar 210 is a threaded bar, only the through hole is formed at the center by using the nut 227

Shaped lower stopper 226 is fixed, it is not necessary to have a through hole for inserting the reinforcing bar 210, and a conventional conventional pedestal can be used.

As described above, when the mortar is injected by separating the gap 220 between the lower surface of the precast unit 100 and the bottom 200 and the sleeve 120 of the precast unit 100, A mortar injection process must be separately performed on the plurality of sleeves 120 formed in the unit 100. [

At this time, one side where the precast unit 100 is installed is clogged or clogged with a wall, so that an operator can not work or the worker can hardly perform the work because the gap with the wall is very close. In the conventional method, since the injection port 122 and the discharge port 124 formed in the sleeve 120 are respectively connected to the outer surface near the sleeve 120, it is difficult to individually perform the mortar injection process to the sleeve 120.

FIG. 5 is a view showing a state in which a work is performed according to an embodiment of the present invention when a work is not performed due to a cliff left on a precast column.

Conventionally, when there is a cliff on one side, there is a problem in that the work cost is increased and the safety is extremely deteriorated because the work is performed using special equipment such as a high-altitude work car.

As shown in the figure, the present embodiment includes an injection path 142 connected to a sleeve 120 positioned on the left that can not perform an operation due to a cliff, and a precast unit 100 ), It is possible to perform mortar injection into the sleeve on a workable surface.

As a method of injecting mortar only into the gap between the bottom surface and the bottom surface of the precast unit, the method of forming the inlet port formed in the temporary membrane as shown in FIGS. 1 and 2 can not be applied.

6 is a view for explaining another embodiment for injecting mortar into a gap between the bottom surface and the bottom of the precast unit.

The injection path 130 is formed in the precast unit 100 in order to inject the mortar directly into the gap 220 between the lower surface of the precast unit 100 and the floor 200. [ One end of the charging path 130 is opened through the side surface of the precast unit 100 and the other end is opened through the lower surface of the precast unit 100. The mortar is connected to the lower surface of the precast unit 100 through a hole formed in the lower surface of the precast unit 100 when the mortar is connected by connecting the hose 910 connected to the mixer and the pressurizer 900 to the open space through the side surface. And is injected directly into the gap 220 between the bottoms 200.

At this time, if the sleeve 120 of the pre-cast unit 100 is clogged by the lower end stop, it is preferable to form a discharge passage of a shape smaller than that of the injection opening of FIG. 1 or 2 in the temporary membrane 230.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Those skilled in the art will understand. Therefore, the scope of protection of the present invention should be construed not only in the specific embodiments but also in the scope of claims, and all technical ideas within the scope of the same shall be construed as being included in the scope of the present invention.

100: precast unit (concrete column) 110: reinforcing bar
120: Sleeve 122:
123: cap 124: outlet
130: input line 142: injection line
144: exhaust passage
200: bottom 210:
220: break 222: pedestal
224: Fixed pedestal 225: Adjustable pedestal
226: lower stopper 227: nut
230: temporary membrane 232: inlet
240: incline brace
900: Mixer and pressurizer 910: Hose

Claims (10)

A method of injecting mortar in a process of forming a sleeve joint by inserting an externally reinforcing bar protruding outward from another structure or a second precast unit to a sleeve formed in a first precast unit,
A gap filling step of installing a temporary membrane around a gap where the first precast unit and the other structure or the second precast unit are spaced apart from each other and injecting mortar into the gap; And
And a sleeve filling step of injecting a mortar into a sleeve of the first precast unit into which the reinforcing bars are inserted,
A lower end stopper fitted to the outer reinforcement to prevent the mortar from flowing into the lower portion of the sleeve in order to separately perform the gap filling process and the sleeve filling process separately,
Wherein the lower end stopper is positioned on a pedestal installed to be fitted to the outer reinforcement to maintain a gap between the lower end stopper,
Wherein the pedestal includes at least one variable pedestal having a through hole through which the externally reinforcing steel is inserted and which is open at one side and can be inserted into or removed from the reinforcing bar in a state where the externally reinforcing steel is inserted into the sleeve,
And adjusting the number of the variable pedestals fitted in the reinforcing bars so as to prevent the lower end stopping the flow of the mortar to the lower side of the sleeve.
The method according to claim 1,
Wherein the gap filling step is performed first, and the sleeve filling step is then performed.
The method according to claim 1,
Wherein the sleeve filling step is performed first and the gap filling step is performed thereafter.
The method according to claim 1,
Wherein the gap filling step is performed by injecting mortar through an inlet formed in the temporary membrane.
The method according to claim 1,
The gap filling process is performed through the inside of the first precast unit and the mortar is connected to the first precast unit through an input path whose one end is open to the lower surface of the first precast unit and the other end is open to the side of the first precast unit. And injecting the mortar.
delete delete delete delete The method according to claim 1,
Wherein the sleeve filling step comprises:
Casting the mortar through an injection path formed through the inside of the first precast unit and having one end opened to the inside of the sleeve and the other end opened to the side of the first precast unit,
Wherein the injection path formed in the plurality of sleeves is opened to the same side of the sides of the first precast unit so that the sleeve filling process for the plurality of sleeves is performed on the side of the side where the injection path is opened.

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