JPH10121466A - Stress material chuting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chuting device to certainly chute a stress material shorter than a drilled hole formed on the foundation in a normal state. SOLUTION: A stress chuting device is fixed on both of plates 11, 12 by arranging a lower end of a base material 15 for positioning on an upper side of a specified interval part 16 of the plates 11, 12 facing against each other. Thereby, an upper end of a stress material 1 is arranged on the lower side of the interval part 16 between these plates and engaged with an engagement rod 17, the base material 15 for positioning is hung down to a specified position in a drilled hole while confirming a position of the stress material 1 by matching it with a scale on the ground, thereafter, engagement of the stress material 1 and a chuting device 10 is released by drawing the engagement rod 17 out of a hole of the stress material 1 by actuating an actuation device 25, and it is positioned in the drilled hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stress material dropping device, and more particularly, to a stress material made of, for example, an H-shaped steel or the like in a drill hole provided along a mountain retaining line in order to prevent ground collapse or ground deformation. Regarding the device to be dropped.

[0002]

2. Description of the Related Art In general, a column-type underground continuous wall construction method (SM)
The pile body in the mountain retaining using the W method or the like is composed of a solidified material such as soil cement and a stress material such as a section steel represented by an H-section steel. Then, the stressed material is dropped into the mudified hole by pouring a solidifying agent while drilling the hole with the aus auger excavator or the like along the retaining line.

Usually, such a drop is carried out by suspending a stress member vertically using a wire rope with a crane. The drop of the stress material at this time means that the stress material is in a normal state (a state where the stress material is kept at a predetermined interval in relation to other stress materials or is dropped straight).
Is performed using a scale arranged on the ground so that

On the other hand, for the reason of material saving, the stressed material sufficiently exerts the function as a pile by combining it with a solidifying material. Therefore, even if the stress material is not set to the same length as the entire length of the drilled hole, there is no problem in strength if the connection with the solidified material is sufficient. The length may be shortened.

[0005] For this reason, when the stress material completely enters the borehole, the stress material becomes invisible due to the mud containing the solidifying agent. Therefore, after the stressed material has completely entered the drilled hole, it was impossible to confirm whether the stressed material was in a proper state by the scale, and had to rely on the feeling of the operator.

[0006]

However, it is difficult for even a skilled worker to determine whether or not the stressed material that has become invisible due to the mud is arranged in a normal state in the borehole. Therefore, the H-shaped steel as the stress material may not be properly dropped. As one example, as shown in FIGS. 15 and 16, a stress material 1 made of an H-section steel is entirely drilled 2
16 is rotated clockwise as shown by the arrow shown in FIG. 16 from the center line 3 of FIG.

FIGS. 17 and 18 show another example.
As shown in FIG. 2, the stress material 1 is dropped obliquely, and the lower part thereof contacts a new hole 2 adjacent thereto.
In still another example, as shown in FIGS. 19 and 20, opposite to the case shown in FIGS. 17 and 18, the upper portion of the stress material 1 faces the adjacent new hole 2. This is the case when the camera is dropped obliquely.

When the excavation proceeds as it is when such a stressed material 1 is dropped, the auger screw 4 of the Aus auger excavator touches or bites the dropped stressed material 1. That would hinder the work. Therefore, in order to prevent the auger screw 4 from hitting the stressed material 1, the stressed material 1 once dropped must be pulled up from the drilled hole 2 and dropped again in some cases, resulting in a problem that the working efficiency is extremely poor. .

For this reason, conventionally, although unnecessary in terms of function, the stress material 1 long enough to reach the scale was used only for dropping it into a normal state. As a result, there is a problem that the number of the stress members 1 to be used is large, so that the price also increases, and the construction cost also increases accordingly.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem, and a dropping device for surely dropping a stress material shorter than a hole formed in the ground in a proper state. Is to provide.

[0011]

SUMMARY OF THE INVENTION The present invention is an apparatus for dropping a stressed material, and is configured as follows to solve the above-mentioned technical problem. That is, the present invention is a stress material dropping device used for dropping a long stress material into a hole formed along a mountain retaining line, which is detachably attached to a lower end of a positioning base material. A recessed body whose portion protrudes from the lower end of the positioning base material, locking means provided on a part of the dropped body protruding from the lower end of the positioning base material, and And an actuating device for actuating the locking means, wherein the drop body is disposed at the upper end of the stress material to be dropped, and the stress material is provided at a part of the drop body projecting from the lower end of the positioning base material. Is locked by the locking means and lifted up. The positioning base material is aligned with a scale installed on the ground surface along the mountain retaining line, and the position of the stress material is confirmed and dropped into a drilled hole, and the predetermined position is determined. To By releasing the locking means when the location is characterized in that to obtain a drop inclusive positional accuracy of the stress member. Hereinafter, important components of the stress material dropping device according to the present invention will be described.

(Drop body) The important function of this drop body is to arrange and hold the positioning base material and the stress material on the same axis. Therefore, as long as the positioning base material and the stress material can be sandwiched and supported, their shapes and sizes are not particularly problematic. As a typical configuration, it is preferable to use a pair of plates.

(Positioning base material) The positioning base material is used for dropping the stressed material into an accurate position, so that it is basically as if the stressed material extends to the ground. It is preferable to use one having the same cross-sectional shape as the stress material. However, it is not necessary to use a material having the same cross-sectional shape as that of the stress material as long as the position where the stress material is dropped can be accurately measured.

(Locking means) The locking means is for dropping the stress material and temporarily connecting to the main body. Such a locking means is preferably locked by using a groove, a hole or the like formed in the stress material. One example is a locking rod. The locking rod enters and exits the drop-in body, and is inserted into and removed from a hole formed in the stress material to enable locking and releasing.

(Operating Device) Various operating devices for operating the locking means can be used depending on the specific structure of the locking means. If the locking means is a locking rod that moves in and out of the drop-down body as described above, a hydraulic piston cylinder mechanism using air or oil or the like can be used as the drive unit. However, it is also possible to install a small electric motor in the sinking body, convert the rotation of the electric motor into linear motion with a cam or the like, and move the locking rod.

According to the stress material dropping device of the present invention, first, the lower end of the positioning base material is fixedly connected to the upper half of the dropping body. Next, the upper end of the stress member is relatively arranged in the lower half of the drop body, and the locking means is operated by the operating device to temporarily lock and connect to the drop body. In this state, the stress material dropping device is lifted, and the stress material is inserted into a predetermined hole.

At this time, the lowering of the stress material is performed by applying the upper end of the positioning base material, which extends substantially directly above the stress material, to a scale disposed on the ground through the lowering device. Performing while positioning Then, if necessary, cure the mud in the borehole as it is until a predetermined hardness is reached, and then actuate the operating device to operate the locking means to lock the dropping body and the stress material. Is lifted, and the dropping device is lifted and lifted out of the borehole.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a stress material dropping device according to the present invention. As shown in FIG. 10, the dropping device 10 according to this embodiment drops a long H-shaped steel as a stress material 1 into a hole 2 formed by using an aus auger excavator O along a retaining line L. It is a device used for

At the time of dropping of the stress material 1, a scale S is installed on the ground surface along the mountain retaining line L in the same manner as in the prior art, and the position of the stress material 1 is confirmed using the scale S, and The drop position accuracy is obtained. As shown in FIGS. 1 and 2, the dropping device 10 has a pair of plates 1 facing each other at a predetermined interval.
It is provided with a drop body composed of 1 and 12.

The pair of plates 11 and 12 can be coupled to each other by four sets of bolts 13 and nuts 14 which are passed through bolt insertion holes (not shown) provided on the respective plates. . This plate 11, 1
2, the positioning base material 15 and the stress material 1 to be described later are disposed so as to be sandwiched therebetween. Become.

That is, the space 16 is a space necessary for connecting the positioning base material 15 and the stress material 1 via the plates 11 and 12, and the upper half of the space 16 , The lower end of the web 15a of the positioning base material 15 made of H-shaped steel, and the positioning base 1 in the lower half.
The upper end of the web 1a of the stress material 1 made of H-section steel having the same cross-sectional shape as that of the web 5 is arranged. Accordingly, this interval results in the positioning base material 15 entering the interval section 16.
And the thickness of the web of the stress material 1.

Holes are formed at the lower end of the positioning base material 15 at positions where the above-mentioned bolts 13 pass, and the bolts 13 are inserted through these holes, so that the plate 11,
12 and is firmly connected. On the other hand, the stress member 1 is detachably locked by locking means while being sandwiched between the plates 11 and 12. This locking means is composed of a single locking rod 17, which has a U-shape fixed to the back surface of the plate 11 (the surface opposite to the surface facing the other plate 12). The support bracket 18 is movably supported in a direction crossing the pair of plates 11 and 12 described above.

That is, the U-shaped support bracket 18
With the open end facing upward and one end plate
1 is firmly fixed by welding or the like. A locking rod 17 is provided substantially at the center of both end plates of the support bracket 18.
Are formed, and insertion holes 20 and 21 for the locking rods 17 are formed in the plates 11 and 12 on the central axis of these holes 19 as well. Therefore, the hole 20 formed in the plate 11 is perfectly aligned with the hole 19 formed in the end plate of the support bracket 18 which is in close contact with the plate 11.

The hole 21 formed in the plate 12 has a reinforcing annular portion 12 along its peripheral edge on the back surface.
a is formed integrally with the plate 12, thereby forming a receiving portion 22 for receiving a rod end portion of the locking rod 17, which will be described later, and performing secure locking. The locking rod 17 has a large-diameter annular flange portion 23 at an axially intermediate portion. This annular flange portion 23
The rod portion extending to one side further includes a support bracket 18.
Is slidably inserted through each of the holes 19 and 20 of the plate 11 and the distal end thereof is inserted into the receiving portion 22 of the opposing plate 12 as described above.

The end of the rod extending from the annular flange 23 to the other side is slidably inserted into a hole 19 formed in the end plate of the support bracket 18. Thus, the locking rod 17 is substantially movably supported by the support bracket 18. Further, around the rod portion extending to the other side from the annular flange portion 23,
A coil spring 24 is contracted and arranged between the annular flange portion 23 and the end plate of the support bracket 18. As a result, the locking rod 17 receives a biasing force such that the entirety of the locking rod 17 always moves to the plate 11 side.

The locking rod 17 is moved in the axial direction by an actuator 25 provided on the back surface of the plate 11. The actuating device 25 includes a driving unit including an air cylinder device 26 having a piston rod 26a that moves along the plate 11, and a link mechanism unit that transmits the movement of the piston 26a and moves the locking rod 17 linearly. It is composed of

Air cylinder device 2 constituting drive unit
The sixth cylinder 26b has its end fixed to the plate 11 and stands substantially vertically upward along the plate 11 as described above. This cylinder 26
b, an end of a piston rod 26a projecting therefrom is provided with a through hole 26c in a direction orthogonal to the longitudinal direction of the rod 26a.
The connecting rod 27 is passed through the through hole 26c.

Both ends of this connecting rod 27 are inserted into slots 28a (FIG. 2) formed in a pair of guide plates 28 fixed to the back surface of the plate 11, and move straight and stably upward along the plate 11. It has been made possible.
One end of a pair of link members 29 constituting a link mechanism is pivotally attached to both ends of a connecting rod 27 protruding through each slot 28a of the pair of guide plates 28.

The other end of each link member 29 is connected to another connecting rod 3 similarly to the connection with the piston rod 26a described above.
0, it is pivotally connected to one end of the connection piece 31. The upper end of the fork-shaped lever 32 is attached to the back surface of the plate 11 by a hinge device 33 immediately above the position where the above-described locking rod 17 is installed. The fork portion 32a of the fork-like lever 32 is
7 are disposed so as to straddle the annular flange portion 23 from above, and locking pins (not shown) provided on both sides of the annular flange portion 23 in slots (not shown) formed inside the fork portions 32a. Are engaged.

Such a fork-shaped lever 32 is shown in FIG.
As is apparent from FIG. 5, the upper end has an inverted L-shape protruding slightly away from the back surface of the plate, and the other end of the connection piece 31 is fixed to the end of the protruding portion at the upper end. The cylinder 26b of the above-described cylinder device 26 further includes a single air supply hose 34 for introducing air to move the internal piston, and an exhaust hose 35 for exhausting the air inside the cylinder 26b by moving the piston. Are connected to each other. The other end of the air supply hose 34 is connected to a pressurized air supply source (not shown) installed on the ground, and the other end of the exhaust hose 35 is open to the atmosphere.

Next, the operation of the stress material dropping device 10 according to the present embodiment and the procedure of dropping the stress material 1 into the drilled hole 2 using the dropping device 10 will be described. First, as described above, the lower end of the web of the positioning base material 15 made of the same H-shaped steel as the stress material 1 is arranged in the upper half of the space between the pair of plates 11 and 12, and the bolt 13 and the nut 1
4 and fastened together.

As a result, the positioning base 15 extends above the dropping device 10. As shown in FIG. 10, the positioning base material 15 is set to have a length such that the upper end reaches the scale S arranged on the ground when the stress material 1 is dropped into the hole 2 by the dropping device 10. . Therefore, it is preferable that the length is approximately the length of the hole 2 minus the length of the stress material 1.

The dropping device 10 waits in this state. Then, as shown in FIG. 4, the stressed material 1 to be dropped is drilled by an aus auger excavator O, and a solidifying agent is introduced into the drilled material 2 to be suspended by a crane or the like in a muddy drilling 2. As shown in FIG. 5, the stress material 1 is temporarily fixed at a position where its upper end slightly protrudes from the hole 2. Next, as shown in FIG. 6, the dropping device 10 suspended by the wires 36 via the positioning base material 15 is arranged on the temporarily fixed stress material 1.

Thereafter, when the cylinder device 26 of the dropping device 10 is operated to raise the piston rod 26a, the connecting rod 27 is moved along the guide slot 28a as shown in FIG. The link member 29 is raised. As a result, one end of the connection piece 31 is lifted. As a result, the fork-like lever 32 pivotally connected to the upper end by the hinge device 33 is rotated, and the fork portion 32a is pivoted away from the plate 11.

By rocking the fork portion 32a, the locking rod 17, which is in a locking relationship with the fork portion 32a as described above, is moved while compressing the coil spring 24 in a direction away from the plate 11, and as a result, The tip of the rod part of the stop rod 17 is the receiving part 2 of the plate 12.
2 and also from the gap 16 between the plates 11, 12. When the dropping device 10 is further lowered in this state, the upper end of the web of the stress material 1 is inserted and arranged in the lower half of the space 16 relatively.

Then, the lifting operation of the piston rod 26a in the cylinder device 26 is released to release the rod 26a.
When the lock rod 17 is set in the free operation state, the tip of the locking rod 17 is again moved to the interval
6 projecting transversely and passing through a hole formed in the stress material 1 to form a receiving portion 22 of the plate 12.
1, thereby ensuring a complete engagement between the stress member 1 and the dropping device 10 as shown in FIGS. 6 and 7.

At this time, as shown in FIG. 7, it is preferable to connect another wire 37 to the stress member 1 for safety. However, it is preferable that the wire 37 fastened to the stress material 1 be connected by a known means that can release the fastening by a remote operation.

Now, the temporary fixing of the stressed material 1 locked in the dropping device 10 is released, and the stressed material 1 is lowered to a predetermined depth in the hole 2 as shown in FIG. Then, the positioning base material 15 is lowered to an accurate position while being adjusted to the scale S on the ground. Thus, the stress material 1
Is accurately located at a predetermined position in the drill hole 2, then
The cylinder device 26 is operated, and the locking rod 17 is withdrawn from the gap 16 between the plates 11 and 12, as described above, whereby the locking of the stress material 1 with the dropping device 10 is released.

The dropping device 10 is again lifted by the wire 36 via the positioning base material 15,
It is pulled out from the drill hole 2. At this time, if necessary, the mud in the borehole 2 is cured as it is until a predetermined hardness is reached, and then the locking relationship between the locking rod 17 and the stress material 1 is released to release the dropping device 10. May be lifted and lifted from the inside of the hole 2.

When the stress material 1 is dropped into the hole 2 using such a stress material dropping device 10, even if the stress material 1 shorter than the length, that is, the depth of the hole 2 is dropped, the stress material 1 is dropped. Since the upper end of the positioning base material 15 attached to the apparatus 10 can be accurately positioned according to the scale S on the ground, such a short stress material 1 can be dropped to an extremely accurate position. As a result, the distance between the adjacent existing stress members can be kept extremely accurately, and the screw 4 of the aus auger excavator O can be prevented from coming into contact with the already dropped stress members 1. .

As shown in FIGS. 12, 13 and 14, plate-like guide pieces 40 are provided at both ends (non-web portions) in the width direction of the positioning base material 15 by the same protruding length as the plates 11 and 12. By mounting the stress material 1 so as to protrude from the positioning substrate 5, the stress material 1 can be easily arranged on the same axis as the positioning material 15, and as a result, the stress material 1 can be easily introduced into the gap 16 between the plates 11 and 12. can do. 12 to 14, the main part of the dropping device is omitted, and only a pair of plates 11 and 12 are shown.

In the stress material dropping device 10 according to the above-described embodiment, an example is described in which the positioning base material 15 is an H-section steel having the same cross-sectional shape as the stress material 1.
This is because the positioning base material 15 is used to drop the stress material 1 shorter than the hole 2 into an accurate position, so that it is basically as if the stress material extends to the ground. This is because However, it is needless to say that it is not necessary to use a material having the same cross-sectional shape as that of the stress material, as long as the drop position of the stress material can be accurately measured.

Further, in the stress material dropping device 10 according to this embodiment, a drive unit composed of a piston-cylinder device using air and a link mechanism unit are used as an operating device for operating the locking rod. A piston-cylinder device using oil or the like can be used, and a small electric motor can be installed in the sinking body, and the rotation of this electric motor can be converted into linear motion with a cam or the like to move the locking rod. Can also.

[0044]

As described above, according to the stress material dropping device of the present invention, even when a stress material shorter than the depth of the drilled hole is dropped, it can be accurately positioned using the scale installed on the ground. Since it is possible to reduce the stress, it is not necessary to use a longer stress material just to fit the scale as in the past, saving the stress material and improving the efficiency of the drop. Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing a stress material dropping device according to the present invention.

FIG. 2 is a cross-sectional view showing the stress material dropping device shown in FIG. 1 cut along line 2-2.

FIG. 3 is a sectional view similar to FIG. 2, showing an operation state of the stress material dropping device shown in FIG. 1;

FIG. 4 is an explanatory diagram showing an initial state of a dropping step of dropping a stress material into a hole.

FIG. 5 is an explanatory view showing a state in which the stress material put into the hole is temporarily fixed in the dropping step of dropping the stress material into the hole, following the initial state of FIG. 4;

FIG. 6 is an explanatory view showing a state where the stress material dropping device according to the present invention is connected to the temporarily fixed stress material shown in FIG. 5;

FIG. 7 is a front view showing the stressed material dropping device shown in FIG. 6 out of a hole for description and enlarged.

FIG. 8 is an explanatory view showing a state where a stress material is dropped into a predetermined position in a drilled hole using the stress material dropping device according to the present invention.

FIG. 9 is an explanatory view showing a state in which the stress material is separated from the state shown in FIG. 8 and the stress material dropping device according to the present invention is pulled up.

FIG. 10 is a configuration explanatory view schematically showing a state in which a mountain retaining work is performed using the stress material dropping device of the present invention.

11 is a view showing an arrangement state of the stress material dropped in the mountain retaining work shown in FIG.
It is sectional drawing cut | disconnected and shown along one line.

FIG. 12 is a front view showing another example of the positioning base material to which the stress material dropping device according to the present invention is attached.

FIG. 13 is a side view of the positioning base material shown in FIG.

FIG. 14 is a bottom view of the positioning base material shown in FIG.

FIG. 15 is an explanatory view showing a state in which the stress material has not been dropped in a correct posture in the retaining work by the conventional method of dropping the stress material.

FIG. 16 is a view of FIG. 15 showing an arrangement state of the dropped stress material in the conventional mountain retaining work shown in FIG.
It is sectional drawing cut | disconnected and shown along line 6-16.

FIG. 17 is an explanatory view showing a state in which the stress material has not been dropped in a correct posture in the retaining work by the conventional method of dropping the stress material.

FIG. 18 is a sectional view of FIG. 17 showing a state of arrangement of the dropped stress material in the conventional retaining work shown in FIG. 17;
It is sectional drawing cut | disconnected and shown along line 8-18.

FIG. 19 is an explanatory view showing a state in which the stress material has not been dropped in a correct posture in the retaining work by the method of dropping the stress material.

FIG. 20 is a view 20-2 in FIG. 19 showing an arrangement state of the dropped stress members in the mountain retaining work shown in FIG. 19;
It is sectional drawing cut | disconnected and shown along a 0 line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stress material 2 drilling hole 10 stress material dropping device 11 plate 12 plate 12 a reinforcing annular portion 13 bolt 14 nut 15 positioning base material 15 a positioning base web 16 spacing portion 17 locking rod 18 support bracket 19 hole 20 Hole 21 Hole 22 Receiving part 23 Annular flange part 24 Coil spring 25 Actuator 26 Cylinder device 27 Connecting rod 28 Guide plate 28a Guide slot 29 Link member 30 Connecting rod 31 Connecting piece 32 Fork-shaped lever 32a Fork part 33 Hinge device 34 Air supply Hose 35 Exhaust hose 36 Wire

Claims (4)

[Claims] 1. A stress material dropping device used to drop a long stress material into a hole formed along a mountain retaining line, wherein the stress material dropping device is detachably attached to a lower end of a positioning base material, and is partially attached. A dropping body projecting from a lower end of the positioning base material, a locking means provided on a part of the dropping body projecting from a lower end of the positioning base material, and provided on the dropping body; An actuating device for actuating the locking means, wherein the drop main body is arranged at the upper end of the stress material to be dropped,
The stress member is locked by the locking means and lifted on a part of the drop main body projecting from the lower end from the positioning base material, and the positioning base is mounted on a scale installed on the ground surface along the mountain retaining line. The stress material is dropped into the drilled hole while checking the position of the stressed material, and when installed at a predetermined position, the locking means is released to obtain the dropped position accuracy of the stressed material. Stress material dropping device. 2. The stress material dropping device according to claim 1, wherein the positioning base material has the same sectional shape as the stress material. 3. An H-shaped steel is used as the stress material, and the plates are arranged on both sides of the web of the H-shaped steel, and the holes through which the locking rods enter and exit are formed in the web. The stress material dropping device according to claim 2, characterized in that: 4. The drop main body is composed of a pair of plates facing each other and forming a predetermined space, and the locking means is provided on one of the pair of plates. A locking rod that is provided and is movable in a direction transverse to the gap, and a receiving portion that is formed on the other of the pair of plates and that receives a distal end portion of the locking rod. 2. The plate according to claim 1, wherein said plate is disposed at an upper end of said stressed material, and said locking rod is inserted into a hole formed at an upper end of said stressed material to lock and lift said stressed material. 4. The stress material dropping device according to any one of 2 and 3.