JP3158116B2 - Through-hole forming device in earth retaining wall construction work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through-hole forming apparatus in earth retaining wall construction work, and more particularly, to forming a through hole in a steel plate forming an earth retaining wall when a slurry is hardened to construct the earth retaining wall. The present invention relates to a through-hole forming apparatus.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing an earth retaining wall in a work of digging a trench or the like, an SMW (Soi) is used because it has a high water stopping property, has a short construction period, is inexpensive, and can have a deep wall.
l Mixing Wall) method is preferably used. This method uses a machine capable of simultaneously performing agitation and excavation to mix soil and cement milk or the like at the site to form a slurry, and to form a plurality of holes 101 as shown in FIG. 14 which is a plan view. The holes are drilled so as to form a row of holes between the ground and the groove (portion where the groove is dug) in communication with each other, and before hardening of the slurry, an H-shaped steel 102 or the like for reinforcement is erected, and the slurry is hardened and the soil is retained How to build a wall.

When the earth retaining wall is constructed in this way, for example, when the groundwater flows in the direction of the trench from the ground, the flow of the groundwater is interrupted at least during the construction period. Therefore, problems such as inundation and rise of well water level occur on the ground side, and problems such as well withering occur on the trench side. After the construction is completed, the retaining wall must be broken to remove the H-shaped steel, but the retaining wall is deep underground and hardened, making the operation extremely difficult and costly. If the removal of the retaining wall is incomplete, the problem due to the above-mentioned underground water shortage remains.

Therefore, the applicant of the present invention first submerged a tube in the slurry on the ground side with respect to the H-shaped steel before the slurry hardened, inflated the tube to push out the slurry, to secure a space, and to remove gravel in the space. After filling, the H-shaped steel is provided with a through-hole, and a retaining wall construction method is proposed in which a bypass pipe for connecting the groove side to the ground side (gravel) is attached (Japanese Patent Application No. 6-17585).

However, in the case of the earth retaining wall construction method, a through-hole is provided in the H-shaped steel to attach a bypass pipe that connects the groove side to the ground side, but the tip of the bypass pipe is attached to the pipe of the bypass mounting member. Since the through-hole is formed by inserting and tightening the flanges of the bypass pipe and the bypass mounting member with screws, there is a problem that the work of providing the through-hole requires time and effort. There is.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and in the construction of a retaining wall, a retaining wall construction capable of efficiently performing a work of forming a through hole in a steel plate constituting the retaining wall. An object of the present invention is to provide a through-hole forming device in construction.

[0007]

Means for Solving the Problems and Action / Effect The through-hole forming apparatus in the construction of the retaining wall according to the present invention provides a through-hole in the retaining wall construction for providing the through-hole in the steel plate in order to achieve the above object. In the forming apparatus, at least one temporary sealing plate which is mainly composed of a cylindrical body and can be pushed out by a predetermined pressing force on an inner peripheral side of the cylindrical body is provided, and the cylindrical body is inserted through the steel plate. And a pushing means for pushing out a temporary closing plate of the holding body. The pushing means has a porous tapered surface through which a fluid can pass through a front portion of the cylindrical body. A pushing member which is provided and is slid in the cylindrical body of the holding body,
And a pressing means attached to the holding member and pressing the pushing member so that the tapered surface of the pushing member pushes out the temporary closing plate to form a through hole.

[0008] According to the through hole forming apparatus in the earth retaining wall construction work of the present invention, since the temporary closing plate is mechanically pushed out by the pressing means, it serves as a through space in the cylinder after the temporary closing plate is removed. Through holes can be easily provided in the steel plate.

[0009] In the through hole forming apparatus in the construction of the retaining wall according to the present invention, it is preferable that a valve is provided between the holding body and the pressing means to block fluid from entering the holding body. In this way, by closing the valve after forming the through hole, the flow of the fluid can be prevented or the flow of the fluid can be intentionally controlled so as not to hinder other operations.

Further, in the through hole forming apparatus in the construction of the retaining wall according to the present invention, after the pushing member is pressed into the cylindrical body of the holding body to push out the temporary closing plate, the pushing member is pushed. It is preferable to provide a stopper for preventing return in the opposite direction. By this stopper, the pushing member is not pushed back by earth pressure or the like, and the flow of the fluid passing through the porous tapered surface of the pushing member is ensured.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a through-hole forming apparatus in the earth retaining wall construction work according to the present invention will be described with reference to the drawings.

The through hole forming apparatus of the present embodiment is used for construction work of a retaining wall as described later. FIG.
2 shows a slurry pushing-out device according to one embodiment of the present invention. FIGS. 1 and 2 show a slurry pushing-out device 1 according to this embodiment.
As shown in FIG. 1, the apparatus includes a long hanging rod 2a and a supporting rod 2b which are vertically connected to each other, and two chuck devices 3 provided on both sides of the hanging rod 2a.
This side view is shown in FIG.

The chuck device 3 is provided with a chuck mechanism 5 inside a cylindrical member 4 as shown partially broken. An enlarged view of the chuck mechanism 5 is shown in FIG. The chuck mechanism 5 is provided with two hydraulic cylinders 9 and 9 on an upper flange 8 of a frame 7 having a center portion defining a water flow hole 6. An annular rubber member 11 is mounted on a lower flange 10 of the frame 7. And the annular pressing plate 12 are alternately superimposed. The hydraulic cylinder 9
Is provided so that the uppermost pressing plate 12 can be pressed toward the lower flange 10. Further, a valve 13 for controlling the flow of water in the water hole 6 is provided at the upper end of the frame.

FIG. 3A shows the state of the hydraulic cylinder 9
In this state, the outer diameter of the rubber member 11 is slightly smaller than the inner diameter of the cylindrical member 4. In this open state, the outer diameter of the rubber member 11 is slightly smaller than the inner diameter of the cylindrical member 4. There is a gap between them. When the end of the tube 14 is fitted into this gap and the uppermost pressing plate 12 is pressed by the hydraulic cylinder 9, each rubber member 1 is pressed as shown in FIG.
1 is flattened and laterally protruded, and the protruding rubber member 11
The end of the tube 14 is sandwiched between the outer peripheral surface of the cylindrical member 4 and the inner peripheral surface of the cylindrical member 4 and pressed. As a result, the tube 14 and the water hole 6 are in sealed communication.

Each end of the tube 14 is attached to the two chuck devices 3 and 3 as described above. At the lower end of the support rod 2b, a tube turning head 16 having a water outlet 15 at the center as shown in FIGS. 1 and 2 is provided. In the tube folding head 16, the central portion of the tube 14 is folded, and the tube 14 is attached in a substantially U-shape along the support rod portion 2b as shown in FIG.

A hanging rod 17 is provided at the upper end of the hanging rod 2a, and the slurry pushing / pulling device of this embodiment can be lifted by a crane using the hanging rod 17. it can.

Next, a through hole forming apparatus according to an embodiment of the present invention will be described. The through-hole forming apparatus of the present embodiment has a holding body and a punching means.

FIG. 5 shows a state in which the holding body 20 is attached to the H-shaped steel 21. This holder 20
Has a temporary sealing plate 23 at one end on the inner peripheral side of the cylindrical body 22 and a flange 24 at the other end. This temporary sealing plate 23 is formed by forming a thin portion 23a in a circular shape near the outer periphery of a circular steel plate. Further, leaf springs 25, 25 are provided inside the cylindrical body 22 so that the temporary sealing plate 23 side is a free end. These leaf springs 25, 25 are provided such that their free ends are slightly separated from the inner peripheral surface of the cylindrical body 22 when no external force is applied, as shown in the figure. In addition, the cylindrical body 22 is usually
Before the H-shaped steel 21 is used for the earth retaining wall construction work, the H-shaped steel 21 is drilled and welded in advance.

Next, as shown in FIG. 6, a push-out member 26 is inserted into the cylindrical body 22, and a valve 27 having a circular water stop plate 27a and two hydraulic A cylindrical body 29 having cylinders (pressing means) 28, 28 is connected in the same order. The cylindrical body 29 has a flange 30 at the front end, and the flange 30 and the flange 24 of the cylindrical body 22 are tightened with bolts 31 so that the cylindrical body 29 and the cylindrical body 22 are fastened.
Are connected via a valve 27. This valve 27
Is to prevent water from entering the cylindrical body 22 of the holder 20.

The pushing member 26 is a plan view of FIG.
As shown in (a) and FIG. 6 (b), which is a side view, the short cylindrical body has inclined surfaces 32, 32 so that the front portion tapers from left and right toward the center. As shown in FIGS. 6B and 6D, the inclined surface 32 is provided with a number of slits 33 through which water can pass. The inclined surface 3 having the slit 33
2 corresponds to the porous tapered surface in the present invention.

Next, the push-out member 26 is pressed by the extension of the hydraulic cylinders 28,28. When the push-out member 26 is pressed in this way, as shown in FIG. 7, the push-out member 26 slides forward in the cylindrical body 22 and pushes out the temporary closing plate 23. At this time, the pressing member 2
6, a leaf spring 25 provided inside the cylindrical body 22 is hooked on a rear portion of the pushing member 26, and the pushing member 26
Is pushed out to a position where it cannot be pushed back.

Next, the cylindrical main body 29 having the hydraulic cylinder 28 is removed, and a bamboo joint 34 is attached instead. For example, a water pipe for flowing groundwater is connected to the bamboo shoot-like joint 34. Until the water pipe is connected, it is desirable to keep the circular water blocking plate 27a closed to prevent water from flowing out.

Next, a process of constructing a retaining wall using the slurry pushing-out device and the through-hole forming device of the present embodiment will be described with reference to FIGS.

First, excavation is performed by the SMW method, and as shown in a sectional view of FIG. 8B, a hole 41 in which a slurry 40 obtained by mixing earth and sand and cement milk or the like at the site is accumulated is excavated. As shown in FIG. 8A, which is a plan view seen from above, a plurality of holes 41 are dug in parallel to form a row of holes that communicate with each other. Three holes are drawn, but in fact more can be dug.) This row of holes is the portion that becomes the retaining wall. FIG.
In (a), the upper side of the row of holes becomes a ground that is not excavated, and the lower side becomes a groove where subway works and the like are performed. FIG.
8B is a cross-sectional view of the row of holes in FIG. 8A as viewed from the left side, and in FIG. As shown in FIG. 8A, a normal H-shaped steel 42 is erected in a predetermined hole of the hole row formed as described above.

Next, as shown in FIGS. 9 (a) and 9 (b), a pre-processed H-shaped steel 43 provided with the two holders 20 is built so that the holder 20 faces the groove side. Be included. By this embedding, as shown in FIG. 9B, the holding body 2 is positioned at a predetermined depth A or B of the hole 41.
0 and 20 are present (in FIG. 9B, only the plate surface on which the holding body 20 is provided is shown in the pre-processed H-shaped steel 43).

Next, by suspending the slurry pushing / pulling device 1 of the present embodiment, to which the tube 14 is attached as described above, with a crane by the hanging rod 17 as shown in FIG. The mold steel 43 is submerged in the slurry 40 on the side where the holding body 20 is not provided. Subsequently, the valve 13 is opened and water is injected into the tube 14 from one of the water holes 6 using a pump or the like (not shown), whereby the tube 14 is expanded and the slurry is pushed away. In this manner, the tube 14 pushes the slurry 40 from the upper end of the pre-processed H-section steel 43 to a portion slightly below the lower holding body 20. After slurry hardening,
The tube 14 is contracted by using a pump or the like (not shown) to draw water out of the flowing water hole 6 different from the one into which water was previously injected, and the tube 14 is contracted from the water jet port 15 (see FIG. 4 and the like). The slurry pushing / pulling device 1 is pulled out from the hole 41 by being lifted by the crane by the hanging rod 17 while supplying water to the lower side. If water is not supplied from the water jet port 15, the space below the tube 14 in the hole 41 may be decompressed and the hole 41 may collapse. Further, the supply of the water from the water ejection port 15 facilitates the pulling out of the slurry pushing and retracting device 1.

Next, as shown in FIGS. 11 (a) and 11 (b), the gravel 44 is put into the space from which the slurry pushing / pulling device 1 has been pulled out. The gravel 44 allows the passage of groundwater, and for example, earth and sand at a construction site can be used. A hardened slurry 45 exists under the gravel 44.

Next, the hardened slurry wall formed at the position indicated by the black spot 46 in FIG. The hardened slurry wall is formed by hardening the slurry and the like displaced by the tube 14. The collapse of the hardened slurry wall is shown in FIG.
As shown in (b), this is performed by ejecting a jet from the tip end portion 48 while inserting the jet supply pipe 47 from above.

Next, as shown in FIGS. 13A and 13B, the temporary closing plate 23 of the fixing member 20 is pushed by using the through hole forming apparatus of this embodiment according to the above-described operation. The pre-processed H-section steel 43 is provided with a through hole as a through space formed after being pulled out and pushed out. Next, as shown in FIG. 7 (b), a bamboo joint 34 is attached, and a water pipe is connected to the bamboo joint 34 for flowing groundwater. It is preferable that the earth and sand on the water pipe installation side of the hole row have been removed by the connecting step of the water pipes, in other words, a trench which is the purpose of construction is dug.

As a result of the above steps, the groundwater in the ground flows through the gravel 44, and the groundwater flows through the through holes, the bamboo joints, and the water pipe. A similar construction is made on the other side of the ditch, and groundwater flows into the gravel on the other side through this conduit. As a result, the groundwater can flow freely, and the ditch under construction can be stopped without dividing the groundwater.

In this embodiment, one temporary sealing plate 23 is provided on one end side of the push-out member 26, but it is pushed out so that muddy water, slurry and the like do not enter the push-out member 26 during construction. It may be provided on the other end side of the member 26.

The holding body 20 (cylindrical body 22) is not limited to the H-shaped steel, but may be a sheet pile or another steel plate.

Further, the slurry pushing and retreating apparatus 1 of this embodiment has two water holes 6, but water is injected from both and drains from both, water is injected from both and drains from one side, and water is injected from one side. Any way of use, such as draining from the other side, may be used.

Although water is injected into the tube 14 in this embodiment, it may be a liquid other than water or a gas such as air.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing a slurry pushing and retracting apparatus according to the present embodiment, wherein FIG. 1A is a front view and FIG. 1B is a plan view.

FIG. 2 is a side view of the slurry pushing-out device of the present embodiment.

FIG. 3 is an enlarged view of a chuck mechanism of the slurry pushing / pulling device of the present embodiment.

FIG. 4 is a front view showing a state in which a tube is attached to the slurry pushing / pulling device of the present embodiment.

FIG. 5 is a diagram illustrating an attached state of a holder of the through hole forming apparatus according to the present embodiment.

6A and 6B are diagrams showing a through hole forming apparatus according to the present embodiment, wherein FIG. 6A is a plan view, FIG. 6B is a partial right side view of FIG. 6A, FIG. (D) is a partial right side view of (c).

FIG. 7 is a side view illustrating a through-hole forming operation performed by the through-hole forming apparatus according to the present embodiment.

FIG. 8 is a view showing a retaining wall construction step (1) using the slurry pushing-out device and the through-hole forming device of the present embodiment.

FIG. 9 is a diagram showing a retaining wall construction step (2) using the slurry pushing-out device and the through-hole forming device of the present embodiment.

FIG. 10 is a diagram illustrating a retaining wall construction step (3) using the slurry pushing-out device and the through-hole forming device of the present embodiment.

FIG. 11 is a diagram illustrating a retaining wall construction step (4) using the slurry pushing-out device and the through-hole forming device of the present embodiment.

FIG. 12 is a diagram showing a retaining wall construction step (5) using the slurry pushing-out device and the through-hole forming device of the present embodiment.

FIG. 13 is a diagram showing a retaining wall construction step (6) using the slurry pushing-out device and the through-hole forming device of the present embodiment.

FIG. 14 is a diagram illustrating a conventional SMW method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slurry pushing-back apparatus 2a Suspension rod part 2b Support rod part 3 Chuck device 4 Cylindrical member 5 Chuck mechanism 6 Water flow hole 9 Hydraulic cylinder 11 Rubber member 13 Valve 14 Tube 15 Water ejection port 16 Tube return head 17 Hanging rod fitting 20 Holder 21 Pre-processed H-shaped steel 22 Cylindrical body 23 Temporary sealing plate 25 Leaf spring 26 Pushing member 27a Circular water stop plate 27 Valve 28 Hydraulic cylinder (pressing means) 32 Inclined surface (tapered perforated surface) 33 Slit 34 Bamboo joint 40 Slurry 41 hole 42 H-shaped steel 43 Pre-processed H-shaped steel 44 Gravel 45 Hardened slurry 47 Jet supply pipe

Claims (3)

(57) [Claims] 1. A through-hole forming device in earth retaining wall construction work for providing a through-hole in a steel plate, wherein the through-hole forming device is mainly composed of a cylindrical body and can be pushed out to the inner peripheral side of the cylindrical body by a predetermined pressing force. A holding body provided with at least one temporary sealing plate and having a cylindrical body fixed so as to be inserted through the steel plate, and a punching means for pushing out the temporary sealing plate of the holding body, The pushing means includes a pushing member provided with a porous tapered surface through which a fluid can pass at a front portion of the cylindrical body and slidable in the cylindrical body of the holding body; And a pressing means for pressing the member so that its porous tapered surface pushes out the temporary sealing plate to form a through hole. 2. A through hole in a retaining wall construction work according to claim 1, wherein a valve is provided between the holding body and the pressing means to block fluid from entering the holding body. apparatus. 3. A stopper is provided in the cylindrical body of the holding member to prevent the pushing member from returning in the direction opposite to the pushing direction after the pushing member is pushed to push out the temporary closing plate. The through-hole forming device in the retaining wall construction work according to claim 1 or 2, wherein: