JP2951227B2 - Construction method of sheet pile and casing tube used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a sheet pile used for earth retaining, closing, foundation of a structure, and the like, and a casing tube used for the method.

[0002]

2. Description of the Related Art Heretofore, when constructing a sheet pile, the pile sheet has been built by a hammering method or a digging method using a pile driving machine or the like. However, when there is an obstacle such as a boulder in the ground, it may not be possible to lay a sheet pile with these methods.
Using a tubing device as disclosed in Japanese Patent Application Publication No. 520, a continuous hole is excavated with a casing tube by an all-casing method, obstacles are removed, and soil and the like are once introduced into the hole to backfill the hole. After that, the piles were built using pile driving machines.

[0003]

However, such a conventional method requires a tubing device that pushes the casing tube while rotating the casing tube, and also requires another construction device such as a pile driver for driving a sheet pile. There was a problem. Also, due to the complexity of the process,
If the construction period is long and a pile driver is used, noise and noise
In some cases, the effects of vibration became a problem.

[0004] Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a sheet pile installation method and a casing tube which can be installed with a simple apparatus configuration, shorten the construction period, and generate less noise and the like. To provide.

[0005]

In order to achieve the above object, the present invention employs the following method to solve the problem.
That is, the casing tube provided with the excavation bit at the tip is pushed in while rotating to push the casing tube close to the adjacent sheet pile, excavate the earth in the casing tube, and after the excavation is completed, the joint of the adjacent sheet pile is joined. Then, the rotation is stopped by aligning the slit formed over the entire length along the axial direction of the casing tube, and thereafter, the opening member that closes the slit is removed to open the slit, and a joint for a new sheet pile is opened from the slit. Projecting out and engaging with the joint of the adjacent sheet pile, inserting the new sheet pile into the casing tube, putting earth and sand between the casing tube and the sheet pile, and then pulling out the casing tube. That is the construction method of the sheet pile. Further, the opening member may be pulled out and removed while applying vibration.

Further, in a casing tube provided with an excavation bit at its tip and pushed into the ground while rotating to excavate, a tube main body having a slit formed over the entire length along the axial direction, and the slit is closed and closed. And an opening member detachably attached to the tube main body. The casing tube used in the method of constructing a sheet pile is suitable for constructing a sheet pile. Also,
The opening member may be configured to close the slit and to be detachably fastened and attached to the tube body by fastening a T-groove formed in an axial direction of the tube body and a T protrusion.

[0007]

According to the construction method of the sheet pile, since the excavation is performed by the casing tube close to the adjacent sheet pile and the soil is discharged from the casing tube, excavation can be performed even if there is an obstacle such as a boulder in the ground. it can. After the excavation is completed, the rotation of the casing tube is stopped by aligning the slit of the casing tube with the joint of the adjacent sheet pile, and the opening member is removed to open the slit.
This allows a new sheet pile joint to protrude from the slit and engage with the adjacent sheet pile joint, allowing the sheet pile to be newly inserted into the casing tube without being hung by a crane, etc. Can be inserted. Next, earth and sand are put between the casing tube and the sheet pile to backfill the casing tube, and then the casing tube is pulled out.

Further, when the casing tube used in the method of constructing the sheet pile is driven to rotate and is pushed into the ground,
When the drill bit drills and the opening member is removed, the slit is opened over the entire length along the axial direction of the tube body. Further, the opening member and the tube main body are T-grooved and T-shaped.
With the fastener fastened by the projection, it is possible to prevent the gap between the slits from becoming wide due to the reaction force during the excavation by the excavation bit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of one embodiment of a tubing device used for carrying out the present invention. Reference numeral 1 denotes a tubing device, in which a lifting cylinder 4 for raising and lowering a lifting frame 3 is assembled on a base frame 2 held in a horizontal state, and a ring-shaped rotating member 6 is mounted on the lifting frame 3 via a bearing 5.
Is rotatably supported. A gear 7 is formed on the outer periphery of the rotating member 6, and a drive gear 8 a fixed to a rotating shaft of a hydraulic motor 8 provided on the elevating frame 3 is meshed with a gear 7 via an idle gear 9. Is configured to rotate the rotating member 6 by the rotation of.

[0010] A tapered hole 11 through which the casing tube 10 can be inserted is formed in the inner periphery of the rotating member 6, and the diameter of the tapered hole 11 is reduced so as to decrease downward. Above the rotating member 6, there is provided a bracket 13a which is raised and lowered by a chuck cylinder 12 arranged on the lifting frame 3. Between the bracket 13a and the rotating member 6, a rotating frame 1 is provided via a bearing 13b.
3c is supported and arranged to move up and down together with the bracket 13a. A wedge-shaped chuck member 14 suspended from the rotating frame 13c is inserted between the tapered hole 11 and the casing tube 10.

As shown in FIG. 2, in this embodiment, the casing tube 10 has a tube body 20a at the end and a plurality of tube bodies 20b for extension. Are formed.
At the opposite end of the drill bit 22, a tube body 2
An insertion portion 24 having an outer diameter smaller than the outer diameter of Oa is formed.

The extension tube body 20b has an insertion hole 26 at one end into which the insertion portion 24 is inserted, and an insertion portion 27 identical to the insertion portion 24 at the other end. I have. Insertion section 24 of tube body 20a at the tip
Is inserted into the insertion hole 26 of the extension tube body 20b, and the insertion portion 24 of the extension tube body 20b is inserted.
Is inserted into the insertion hole 26 of another extension tube main body 20b, and a plurality of extension tube main bodies 20b are added.

A plurality of pins 28 are radially inserted and fixed along the outer periphery, and the casing tube 10
Is formed to a required length. Further, a part of the tube body 20a at the distal end and a part of the tube body 20b for each extension are cut out continuously along the axial direction, and the slit 30 is extended over the entire length along the axial direction of the casing tube 10.
Are formed.

As shown in FIG. 3 (only one side is shown in FIG. 3), T-grooves 32 are formed in both ends of the tube bodies 20a and 20b so as to be continuous over the entire length. . The casing tube 10 has a pair of opening members 34 that are formed to have substantially the same width as the slits 30 and that can be fitted to close the slits 30.
a, 34b, and the entire length of each opening member 34a, 34b is formed to be the same as the tube body 20a at the tip and the tube body 20b for extension. In the present embodiment, the cross-sectional shape of the opening members 34a, 34b is formed in the same arc shape as the tube main bodies 20a, 20b, but the opening members 34a, 34b may be formed in flat plate shapes.

As shown in FIG. 4, in the opening members 34a and 34b, an insertion portion 36 and an insertion groove 38 are formed similarly to the insertion portion 24 and the insertion hole 26 of the tube main bodies 20a and 20b, respectively. Insertion portion 24 of tube body 20a
And the insertion portions 36 of the opening members 34a and 34b, a single cylinder is formed, and the insertion hole 26 of the tube body 20b and the insertion groove 38 of the opening member 34b form one continuous hole. It is configured.

Then, a plurality of pins 40 are inserted with the insertion portion 36 aligned with the insertion groove 38, and the opening member 34 is inserted.
a and 34b can be joined together. T-grooves 3 are provided on both side surfaces of the opening members 34a and 34b.
2, a T-shaped protrusion 42 is formed over the entire length.

Each of the opening members 34a and 34b is connected by a pin 40, and the T projection 42 is inserted into the T groove 32 to close the slit 30 as shown in FIG. In the present embodiment, the extension tube body 20b for the upper stage is used.
The stopper plate 44 is integrally fixed to the opening member 34b by a plurality of pins 46a and 46b to prevent the opening members 34a and 34b from coming off.

Next, a procedure for constructing a sheet pile using the casing tube of the above-described embodiment will be described. still,
In the present embodiment, a steel pipe sheet pile shown in FIG. 8 will be described as an example of the sheet pile 50. The sheet pile 50 is a joint 5 having slits 54 and 56 formed in the axial direction of a thin steel pipe on both sides of the outer circumference of the steel pipe 52.
8 and 60 are fixedly connected to each other, so that the sheet piles 50 can be continuously connected by the joints 58 and 60. The sheet pile 50 is not limited to the steel pipe sheet pile, and can be similarly implemented with steel sheet piles of other shapes.
The same applies to a concrete sheet pile.

First, the insertion portion 24 of the tube body 20a at the distal end is inserted into the insertion hole 26 of the tube body 20b for extension, and connected by a pin 28. Further, the T projections 42 of the opening members 34a and 34b are inserted into the T
0, the slit 30 is closed, and the stopper plate 44 is attached by pins 46a, 46b.

On the other hand, as shown in FIG.
The tubing device 1 is installed so that the casing tube 10 can be excavated as close to the joint 58 as possible. Then, as shown in FIG. 1, the casing tube 10 connecting the distal end tube body 20a and the extension tube body 20b is inserted into the tapered hole 11 of the rotating member 6, and the chuck cylinder 12 is driven to drive the bracket 13
a is lowered. As a result, the chuck member 14 is connected to the tapered hole 1 via the bearing 13b and the rotating frame 13c.
1 and the casing tube 10, and the rotating member 6 and the casing tube 10
Is concluded.

Next, the hydraulic motor 8 is driven to rotate, and the rotary member 6 is rotated via the drive gear 8a and the idle gear 9, and the casing tube 10 is rotated with the rotation of the rotary member 6.
Is rotated. In addition, the elevating cylinder 4 is driven to lower the elevating frame 3, and the casing tube 10 is pushed into the ground via the rotating member 6, the chuck member 14, and the like.

The drill bit 2 of the tube body 20a at the tip
2, the excavation is performed without any trouble even if there is an obstacle such as a boulder in the ground, and the sediment remaining in the casing tube 10 is caused to drop a hammer cradle lifted by a crane (not shown), and is discharged by the hammer rub or an auger. Discharge with a drill etc.

After excavation to a predetermined depth, the stopper plate 44 is once removed, and a new extension tube body 20b is connected by the pins 28 and 40 and added. By repeating this, excavation is performed to a depth corresponding to the length of the sheet pile 50, and the sediment inside is discharged. The reaction force during the excavation by the excavation bit 22 acts on the method of widening the interval between the slits 30, but the interval is not widened because it is fastened by the T groove 32 and the T protrusion 42. In addition, the T groove 32 and T
The present invention is not limited to the fastening mechanism using the protrusions 42, but may be implemented using a so-called fastening mechanism using a dovetail groove.

After the excavation is completed, the rotation of the casing tube 10 is stopped by aligning the joint 58 of the adjacent sheet pile 50 with the slit 30 of the casing tube 10. Then, as shown in FIG.
Is replaced with a holder plate 62 fixed by the pin 46a, and the adapter 64 is attached to the tip of the opening member 34b by the pin 46b.
Attach by

The adapter 64 is held by a vibrator 66 suspended by a crane (not shown), and the vibrator 66 is driven by the crane to drive the vibrator 66 to vibrate the opening members 34a and 34b.
As a result, the opening members 34a and 34b
The protrusion 42 is pulled up while sliding, and the slit 30 is lifted.
Is opened. Opening members 34a, 34 while applying vibration
By pulling out b, it can be pulled out smoothly, but it can also be carried out by pulling out directly with a crane without using the vibrator 66.

The opening members 34a and 34b are connected to the tube body 2
After removing from the holders 62a and 20b, the holder plate 62 is also removed, and a new sheet pile 50 is lifted by a crane as shown in FIGS.
And the joint 60 of the new sheet pile 50 is aligned with the joint 58 of the adjacent sheet pile 50.

Then, while the sheet pile 50 is lowered by the crane, the joint 60 of the new sheet pile 50 is projected from the slit 30 to engage with the joint 58 of the adjacent sheet pile 50, and the sheet pile 50 is inserted into the casing tube 10.
After the sheet pile 50 is inserted, the casing tube 10 and the sheet pile 5 are inserted.
The earth and sand 68 are put between 0 and backfilled. In addition, sheet pile 50
May be charged into the steel pipe 52 as required.

Thereafter, as shown in FIG. 7, the casing tube 10 is lifted by a crane (not shown) and pulled out from the ground. And again, the casing tube 1
0 is excavated by approaching the joint 58 of the sheet pile 50, and a new sheet pile 50 is built as described above.

As described above, even if there is an obstacle in the ground, the sheet pile 50 can be built, and the sheet pile 50 can be constructed with a simple device configuration without using a pile driver. In addition, since the procedure is simple, the construction period can be shortened, and the construction can be performed without using a construction device that causes large noise and vibration such as a pile driver, so that the influence on the environment can be reduced.

As described above, the present invention is not limited to such embodiments at all, and can be implemented in various modes without departing from the gist of the present invention.

[0031]

As described above in detail, the method of constructing a sheet pile according to the present invention is capable of embedding a sheet pile even if there is an obstacle in the ground, and using a simple device configuration without using a pile driver. Can perform construction. In addition, since the procedure is simple, the construction period can be shortened, and construction can be performed without using construction equipment that causes large noise and vibration such as a pile driver, so that the effect on the environment can be reduced. Play.

Further, the casing tube provided with an opening member for closing the slit is suitable for the construction of a sheet pile, and the casing tube in which the opening member and the tube body are fastened with a T-groove and a T-projection is used for excavation by a drill bit. The gap between the slits does not increase due to the reaction force.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a tubing device used for carrying out the present invention.

FIG. 2 is a schematic perspective view of a casing tube as one embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a T-groove and a T-protrusion according to the present embodiment.

FIG. 4 is an enlarged cross-sectional view of a reinforced portion of the opening member of the embodiment.

FIG. 5 is a cross-sectional view of the tubing device in a state where the opening member of the present embodiment is pulled out.

FIG. 6 is a cross-sectional view of the tubing device in a state where the sheet pile of the present embodiment is inserted into a casing tube.

FIG. 7 is a cross-sectional view of the tubing device in a state where the casing tube of the present embodiment is pulled out.

FIG. 8 is a plan view showing a state in which the sheet piles of this embodiment are continuously constructed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tubing apparatus 10 ... Casing tube 20a, 20b ... Tube main body 22 ... Drilling bit 30 ... Slit 32 ... T groove 34a, 34b ... Opening member 42 ... T protrusion 50 ... Yaita 58, 60 ... Joint 66 ... Vibrator

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-142835 (JP, A) JP-A-50-66914 (JP, A) JP-A-6-257366 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) E02D 7/00

Claims (4)

(57) [Claims] 1. An excavation is performed by rotating a casing tube provided with an excavation bit at a tip thereof while rotating and pushing the casing tube in close proximity to an adjacent sheet pile, and discharging the soil in the casing tube. The rotation is stopped by aligning the slit formed over the entire length along the axial direction of the casing tube with the joint of the sheet pile and stopping the rotation. Thereafter, the opening member that closes the slit is removed to open the slit. Project the joint of the sheet pile and engage it with the joint of the adjacent sheet pile, insert the new sheet pile into the casing tube, put earth and sand between the casing tube and the sheet pile, and then pull out the casing tube A sheet pile construction method characterized by the following. 2. The sheet pile construction method according to claim 1, wherein the opening member is pulled out and removed while applying vibration. 3. A casing tube having an excavation bit at its tip and excavating by being pushed into the ground while rotating, comprising: a tube main body having a slit formed over the entire length along an axial direction; And an opening member detachably attached to the tube main body. A casing tube used in a method for constructing a sheet pile, comprising: 4. The opening member closes the slit and is detachably attached to the tube main body by fastening a T-groove formed in an axial direction of the tube main body to a T-projection. A casing tube for use in the method of constructing a sheet pile according to claim 3.