KR20090093373A - Mono Jack Device - Google Patents

Abstract

A single tensing device for an anchor PC steel strand is provided to efficiently perform the work in the hydraulic pressure direction control valve and pressure gauge at a preset pressure. A single tensing device for an anchor PC steel strand comprises a first spool for compressing a gusset(2), a second spool for tensing a steel strand(3) and a first hydraulic chamber(4), a second hydraulic chamber(5), and a third hydraulic chamber(6). The second hydraulic chamber is connected to a first hydraulic pressure supply and discharge line(A). The first hydraulic chamber houses the first spool and is connected to a third hydraulic pressure supply and discharge line(C). Third hydraulic chamber is connected to a second hydraulic pressure supply and discharge line(B). The first, second and third hydraulic pressure supply and discharge lines are blocked from the second hydraulic chamber by a partition wall and are connected to the fluid pressure direction control valve(14). The hydraulic pressure direction control valve includes a pressure gauge(13) connected to a main supply line(M) of a hydraulic pressure supply unit(10) equipped with a hydraulic pump(11) thereon so that, after a PC steel strand(W) is sufficiently tensed at a preset pressure, it is compressed in the gusset and coupling and anchoring the PC steel strand are enabled.

Description

Mono Tension Device of Settled PC Strand

In the present invention, when the strand is inserted into the rock from the tunnel wall or the soil wall to be fixed in the ground, the strand is buried between the tunnel wall or the soil wall and the rock using the tensile force of the PC strand, which has high tensile strength. The present invention relates to a mono jack device for fixing PC strands for tensioning strands.

In the tensioning device, the tensioner is embedded in the ground, and one end thereof is exposed to the surface outside the earth wall or tunnel, so that the exposed part is pulled to apply the pre-stress to the strand, so that the earth wall or tunnel The wall and the rock are in tension with each other. However, in the related art, a method of supporting a tunnel wall or other soil wall by fixing and disposing its tip portion on a rock using rebar or the like has been applied.

Therefore, conventionally, it is merely a concept of supporting soil walls, not a prestress concept.

Therefore, the present invention uses the pretensioning method for applying to the span beam, the rail PC support, the straight PC beam, the PC slab, and the earth anchor method of the bridge which requires a particularly low load, and the peripheral friction between the PC strand and the member during tension. It is aimed to provide a simple and efficient single tensioner.

For this purpose, the present invention is to set the pressure with the pressure gauge in order to provide a simple and efficient single tensioning device that can be operated and adjusted by hydraulic pressure, and there is no peripheral friction between the PC strand and the member, and according to this pressure setting The focus is on providing a single tensioning device that operates a hydraulic pump so that two sprues are free to reciprocate by three hydraulic lines.

Figure 1 is a schematic diagram showing the operation of the device clearly showing the relationship between the switching of the hydraulic flow direction control valve of the present invention and the corresponding hydraulic pump, tensioner.

FIG. 2 is a schematic explanatory view of a hydraulic pressure supply device driven by a motor in a step before the hydraulic line in FIG. 1.

FIG. 3 is a schematic explanatory view of a hydraulic supply device which is manually driven in a previous step of the hydraulic line in FIG. 1.

Figure 4 shows a cross-sectional view as one embodiment of the apparatus of the present invention.

The tension device of the present invention will be described below in detail using FIG. 1 as an embodiment.

The tension device of the present invention is largely divided into a hydraulic supply part, a hydraulic distribution part and a hydraulic use part (tensioner). The hydraulic supply part is divided into a hydraulic pump, a hydraulic gauge, a fluid supply and a return line, and the hydraulic distribution part is divided into a hydraulic distribution switching valve and a hydraulic feed line. In addition, the hydraulic use portion (tensile device) is composed of a first sprue, a second sprue, and the first to the third hydraulic chamber as shown in Figure 1 therein. In other words, the tension device of the present invention is basically settled in the ground and fixed to the part exposed to the ground surface fixed to the rock anchorage tension device is divided largely into a single tensioner, hydraulic supply line and hydraulic distribution line to pull the tension As the tensioning device is basically as shown in FIG. It is divided into first spun for pressing crimp, second spun for tension wire and first hydraulic chamber, second hydraulic chamber and third hydraulic chamber, and the second hydraulic chamber communicates with the first hydraulic supply and discharge line (A). The first hydraulic chamber has the first sprue embedded therein, and is in communication with a third hydraulic supply and discharge line C. The third hydraulic chamber is in communication with the second hydraulic supply and discharge line B. Blocked by the second hydraulic chamber and the partition wall, the second and third hydraulic lines (B) (C) are in communication with each other, these hydraulic supply and discharge lines (A) (B) (C) are adjusted in the hydraulic direction The pressure fluid supplied by the hydraulic directional valve is converted, that is, switched to be selectively supplied to the first hydraulic line A or the second hydraulic line B, and the hydraulic pressure The directional valve has a pressure gauge connected to the main supply line (M) of the hydraulic supply device having a hydraulic pump. Is then the PC strand (W) is a sufficient tension to the set pressure It is a tension device for rock anchored PC strands, characterized in that the fastening of PC strands is possible by crimping to the setset.

For other parts and accessories, a check key having a conventional structure is known, and thus description thereof is omitted here.

The hydraulic chamber is composed of hydraulic lines A, B and hydraulic directional control valves connected to the hydraulic directional control valves, and the hydraulic directional control valves are connected to the hydraulic pump via the main line and the return line.

A hydraulic pump control valve is attached to the hydraulic pump, a hydraulic line control opening and closing valve between the hydraulic pump and the main line is also attached, and a pump handle is also mounted when manually operating the hydraulic pump.

On the other hand, the single tensioning device is fastened and fastened PC strands at one end during work The wedge set and its centerline are aligned against each other and leveled to The pressure cylinder The PC stranded wire is clamped and pulled from the stranded tension cylinder while pressing the gasket.

According to the present invention, a portable portable drawer can support the tunnel wall or the earth wall effectively without any obstacle through the PC strands fixed therein, and also set the hydraulic direction control valve and the pressure gauge. Pressure can facilitate and reasonably drive a given task.

Figure 1 is a schematic view of the operation of the present invention showing the relationship between the switching of the valve for adjusting the hydraulic flow direction and the hydraulic pump driven by the hydraulic pressure, corresponding to the tensioner.

2 shows a schematic diagram of a hydraulic supply device driven by a motor.

3 schematically illustrates a hydraulic pressure supply device that is manually driven.

4 shows a cross-sectional view of the apparatus of the present invention as an embodiment.

<Key sign>

1. Tensioner

2. First Spoul

3. Second Spoul

5 ~ 7. 1.2,3 hydraulic chamber

11. Hydraulic pump

14. Hydraulic direction control valve

15. Hydraulic line shut off valve

20. Fixing PC stranded wire G set

A, B. Hydraulic line

W. PC Strand

The apparatus of the present invention is shown in Figs. 1 to 4 as one embodiment.

As described above, the hydraulic supply unit of the present invention ("hydraulic" refers to a fluid having a pressure, simply referred to as "hydraulic").

As shown in Figs. 2 and 3, the pump unit, the pressure gauge and the fluid main supply line (main line).

The fluid introduced from the oil tank is pumped to a predetermined pressure by a vibration pump or a hand pump operated by a pump handle, and is then sent to the hydraulic flow direction control valve 14 through the main line M.

The supplied fluid flows through the main line to the hydraulic flow direction control valve 14 and then in this hydraulic flow direction control valve 14 having three directional valve structures, as shown in FIG. Is switched to.

The structure and operation of the three-way control valve itself can be used since it is known on the market will be omitted here. However, in the present invention, it is also possible to use a manual portable hydraulic pressure direction control valve, which is left, neutral, and bypassed by a handle rotation as shown in FIGS. 2 and 3. Open).

The present invention will be described below the operation of the single tensioning device.

The 1st hydraulic chamber 4 of the tensioner mentioned above is equipped with the 1st hydraulic chamber inflow opening 7, and is provided with the substantially trapezoidal 1st spool 2 in it. As in 1, it moves forward or backward as the pressured fluid enters and exits. (If the fluid is inflowed through the hydraulic line A, the fluid is advanced through the hydraulic line C.) The second hydraulic chamber 5 is provided with a second inlet port (8) and connected to the hydraulic line A, the second hydraulic pressure The fluid flowing into the chamber 5 moves the first sprue 2 in the forward direction (right direction in FIG. 1). The second hydraulic chamber and the third hydraulic chamber are blocked by a partition wall except for the through hole through which the center PC strand is passed. At this time, as the PC stranded wire (W) held by the first spun (2) moves in the forward direction, the second spun (3), which also bites the PC stranded wire (W), also moves in the forward direction.

Next, when the pressure fluid flows into the third hydraulic chamber 6 via the inlet 9 through the B line, the second sprue 3 is reversed to the left in FIG. 1, and the C line communicated with the B line. The fluid having a predetermined pressure flowing through the gas flows into the first hydraulic chamber 7 and presses the first sprue 2 so as to bite the PC strand W and move backward to the left in FIG. The PC strand W is strongly tensioned in the drawing direction, which is the left direction of FIG. At this time, since the fluid introduced into the second hydraulic chamber, that is, the oil having a pressure, is discharged, when the fluid having the pressure is returned, the fluid is generally reversed from the above action and is recovered by the hydraulic pump through the return line R. . In addition, when the pressure fluid flows into the second hydraulic chamber 5, the pressure fluid in the hydraulic chamber 2 and the hydraulic chamber 3 is discharged out of the hydraulic chamber and is also recovered through the return line R.

The hydraulic supply mechanism for the above operation will be described next step by step by FIG.

a) Open the line open / close control valve 12 of the hydraulic pump 11.

b) The hydraulic pump 11 may use a manual pump or an automatic hydraulic pump configured with electric and electronic circuits or a pneumatic pump using air in consideration of site conditions. The hydraulic pressure formed is sent from the hydraulic pump 11 to the A line through the main line M at the set pressure set in the pressure gauge 13. In order to supply pressure fluid to the A line, the hydraulic direction control valve 14 is switched (converted) and flows to the right side, that is, the A line, and is supplied to the second hydraulic chamber 5.

c) Accordingly, the hydraulic pressure moves the first sprue 2 holding the stranded wire in the forward direction, which is the right direction in FIG. 1. Accordingly, the PC strand also moves in the forward direction. At this time, since the first sprue 2 is not pressured by hydraulic pressure, the first spoul 2 is moved forward in a state in which the crimping of the stranded wire is released.

Next, the pressure gauge 13 calculates the force acting on the numerical value of the pressure gauge 13 and sets the required pressure to the pressure gauge 13.

d) Operate the required force as set above and close the line open / close control valve (15). Then, the hydraulic pressure of the A line is maintained in the tensioner by the pressure gauge scale to maintain the position of the first sprue 2.

e) Next, when the hydraulic direction control valve 14 is switched in the B line direction, the first and second sprues 2 and 3 are spun in the PC direction in the backward direction, which is the left direction of FIG. Tension). At this time, the fluid of the A line is discharged from the second hydraulic chamber 5 and recovered through the A line. To prevent fluid backflow into the next A line, close the A line open / close control valve 15 and continue the PC strand tensioning operation. The hydraulic line open / close control valve 15 can be opened and closed by normal sensor operation according to the hydraulic pressure, and can be opened and closed manually.

f) Next, while tensioning the strand (W) for free-stress fixing of the strand, while tightening the PC strand cable fixing bolt 21 (not shown). The gasket 20 is manually driven to fix the PC strand in a state where the PC strand is sufficiently tensioned (to the left in Fig. 1).

By doing the above method continuously and giving each PC strand a free-stress By fastening the gasket 20, it is possible to fix the PC strand in a sufficiently tensioned state.

Claims (3)

In the rock anchoring tension device which is divided into a single tensioner, a hydraulic supply line, and a hydraulic distribution line to settle in the ground, fasten and fix the exposed part on the ground, and pull the tensioned strand. The tensioning device is basically It is divided into a first spun (2) for pressing crimp, a second spun (3) for tension wire tension and a first hydraulic chamber (4), a second hydraulic chamber (5), and a third hydraulic chamber (6). 2 Hydraulic chamber 5 is in communication with the first hydraulic supply and discharge line (A), the first hydraulic chamber 4 has the first sprue 2 therein, the third hydraulic supply and discharge The third hydraulic chamber 6 is in communication with the line C, and the third hydraulic chamber 6 is in communication with the second hydraulic supply and discharge line B, and is blocked by the partition wall with the second hydraulic chamber 5, and the second and the second 3 hydraulic lines (B) (C) are in communication with each other, these hydraulic supply and discharge lines (A) (B) (C) are connected to the hydraulic direction control valve (14), The pressure fluid supplied by the hydraulic direction control valve 14 is switched and selectively supplied to the first hydraulic line A or the second hydraulic line B, and the hydraulic direction control valve 14 ) Is equipped with a pressure gauge 13 connected to the main supply line (M) of the hydraulic supply device (10) having a hydraulic pump (10) and the PC stranded wire (W) is sufficiently tensioned at the set pressure and the Tension device for rock anchoring PC strands characterized in that the fastening of the PC strands by pressing on the gasket 20 is possible. The method of claim 1, The first hydraulic supply and discharge line (A) is equipped with a hydraulic line opening and closing control valve 15 to control the hydraulic line opening and closing, the fluid having a predetermined pressure supplied through the first hydraulic supply and discharge line (A) After the gas flows into the second hydraulic chamber 5, the hydraulic line opening / closing control valve 15 is closed to supply the first sprue 2 to the first sprue 2 while maintaining the predetermined pressure. Tensioning device for rock anchored PC strands which is positioned in the continuous forward direction. The method of claim 1, The hydraulic direction control valve 14 is a tensioning device of the rock anchoring PC stranding line to distribute the supplied fluid to the hydraulic line (A), or the hydraulic line (B) or the return line (R) manually or automatically directional control .