JP2002047653A - Construction method for mortar pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constructing method for a mortar pile requiring no large execution machine, eliminating the effect on surrounding houses by noise or ground upheaval, and allowing execution on a road narrow in width or the like. SOLUTION: The ground 1 is drilled by a easing pipe 2, an H-steel 5 is inserted into a drilled hole 4, mortar 8 is placed in the hole 4, then the easing pipe 2 is extracted. A small boring machine used for casing drilling can be employed according to this construction method, noise or ground upheaval is not generated, thereby execution is allowed without receiving restrictions even on a road narrow in width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a mortar pile using a casing drilling method.

[0002]

2. Description of the Related Art Conventionally, various construction methods have been adopted as a method for forming an underground continuous wall such as a water stop wall or an earth retaining wall. For example, a steel sheet pile construction method in which a sheet pile of steel is driven by a pushing device, a CCP (Chemical) method in which an ultra-high pressure hardener is rotationally sprayed into the ground to cut the ground and simultaneously form a consolidated body.
Churning Pile method, JSG (Jumbo Je) that cuts the ground by rotatingly spraying an ultra-high pressure hardener with air into the ground, discharges slime to the surface, and forms a consolidated body at the same time.
t Special Grout) There is a chemical liquid injection method in which a liquid chemical such as a water glass solution is injected into the ground from a rod tube and solidified.

[0003]

The steel sheet pile construction method is excellent in strength, watertightness and durability, but cannot be constructed on narrow roads because it requires a large construction machine. There is a drawback that the noise is loud. The CCP method is
By giving directionality to the injection of the curing agent, horizontal, vertical,
There is an advantage that the construction can be performed in any diagonal direction, but there is a possibility that a bulge or the like is generated in the ground due to the pressure due to the high-pressure injection, which adversely affects neighboring houses. The JSG method is
Although the noise is small and the effect on the ground is small, a large crane is required for connecting and cutting rods during construction. The chemical solution injection method has a compact facility and machine and requires only a short construction period. However, there is a possibility that ground uplift due to the injection pressure of the chemical solution may occur and adversely affect nearby houses.

As described above, the conventional construction method requires a large construction machine, generates a large noise during construction,
Since the ground was raised, the impact on the space and neighboring houses was limited, and it was not suitable for construction on narrow roads.

The present invention solves such a problem and eliminates the need for a large-scale construction machine, eliminates the influence of noise and ground uplift on neighboring houses, and enables construction on narrow roads and the like. It is an object of the present invention to provide a method for forming a mortar pile that has been made possible.

[0006]

According to the present invention, a ground hole is drilled using a casing pipe, and a hole is drilled into the drilled hole.
A method is employed in which a section steel is inserted, a mortar is poured into the hole into which the H-section steel is inserted, and then the casing pipe is pulled out.

[0007] In this way, since the construction can be performed using a small boring machine used for drilling the casing, the construction can be performed easily even in a place where there is not enough space. Moreover, since the casing drilling has less noise during construction than the sheet pile method and the like, and there is no possibility of the ground being raised unlike the CCP method or the chemical liquid injection method, the concern of adversely affecting neighboring houses can be eliminated. Therefore, even on a narrow road, it is possible to construct without restriction.

In the present invention, a cushioning material may be provided on the H-section steel. According to this, when the construction place is, for example, a place close to the track, the vibration caused by the train is absorbed by the cushioning material, so that the influence of the vibration on the house can be reduced. Further, since the casing pipe is inserted into the hole, the H-section steel and the cushioning material can be inserted smoothly along the inner wall of the pipe.

Further, in the present invention, an H-shaped steel provided with a cushioning material may be inserted into a plurality of drilled holes at intervals, and a cushioning material may be inserted into a hole where the H-shaped steel is not inserted. .
According to this, the cushioning material is arranged in all holes,
There is an advantage that vibrations can be effectively absorbed and H-shaped steel can be saved to reduce costs.

Further, in the present invention, the holes for inserting the H-section steel are drilled at intervals, and mortar is injected into the ground by an injection pipe inserted into the holes, so that the gap between the holes is reduced. Can be filled with mortar to make it waterproof. According to this, there is an advantage that the number of man-hours for drilling holes can be reduced, the construction period can be shortened, and the cost can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a process diagram showing an example of a method for forming a mortar pile according to the present invention. Hereinafter, the construction order will be described in accordance with this. First, as shown in (a), the ground 1
Then, casing drilling is performed using the casing pipe 2. A bit 3 is provided at the tip of the casing pipe 2, and the hole 4 is drilled by the bit 3 while rotating the casing pipe 2 by a small boring machine (not shown). At this time, drilling is performed while discharging water from the end of the casing pipe 2.

In a normal boring machine provided with a wing bit at the tip of a rotating rod, drilling is performed while discharging muddy water to form a mud film on the hole wall so that the inner wall of the hole does not collapse. In the case of a hole, since there is no possibility that the inner wall will collapse due to the casing pipe 2, it is not necessary to use muddy water, and ordinary water may be used. According to the casing drilling, the inner diameter of the hole 4 is 150 mm.
And a hole having a smaller diameter can be formed as compared with the case of drilling with a wing bit using a normal boring machine (hole diameter of 500 mm or more).

Next, as shown in FIG. 1B, an H-section steel 5 is inserted into the hole 4 thus drilled. At this time, since the casing pipe 2 is inserted into the hole 4, the H-section steel 5 is
Is guided smoothly by the inner wall of

After the H-section steel 5 is inserted below the hole 4, an injection hose 7 connected to a pump device 6 is introduced into the hole 4 as shown in FIG. The mortar 8 is cast into the hole 4 via the hose 7. The mortar 8 is made of so-called cement milk in which cement, fly ash, sand, water and the like are mixed.

Thereafter, before the mortar 8 is solidified,
As shown in FIG. 1D, the casing pipe 2 is pulled out from the hole 4. At this time, the H-section steel 5 remains in the hole 4. Then, when the mortar 8 is solidified after a lapse of time, the mortar pile M in which the H-section steel 5 is embedded as a core material in the mortar 8.
Is created. A plurality of such mortar piles M are sequentially formed at predetermined intervals, and function as a water blocking wall or a retaining wall.

According to the above construction method, the formation work can be performed using a small boring machine for casing drilling.
Construction is possible even on narrow roads. Further, the casing bore does not generate a loud noise unlike the sheet pile method, and does not disturb the surroundings. Furthermore, since high pressure is not applied to the ground, it is possible to prevent the ground from rising, and to avoid adverse effects on nearby houses and the like.

FIG. 2 shows another embodiment of the present invention, which is an example in which a cushioning material 9 is attached to an H-section steel 5. Cushioning material 9
Is formed from, for example, a styrene foam square member, and is attached to the inside of the flange of the H-section steel 5 with an adhesive or a tape. The H-section steel 5 and the cushioning material 9 are integrally inserted into the hole 4 in the step of FIG. Also in this case, the H-section steel 5 and the cushioning material 9 can be guided smoothly by the inner wall of the casing pipe 2 and can be smoothly inserted.

According to this, the vibration transmitted through the ground is absorbed by the cushioning material 9, so that, for example, when the construction site is near a railway track, the influence of the train vibration on nearby houses can be reduced. .

FIG. 3 shows another embodiment of the present invention, in which an H-shaped steel 5 provided with the above-mentioned cushioning material is inserted into a plurality of holes at intervals (here, every other one). It is.
The plurality of holes 4a, 4b, and 4c are formed adjacent and in communication with each other, and an H-section steel 5 having a buffer material 9 attached to the holes 4a and 4c is inserted. The H-section steel 5 is not inserted in the hole 4b, and only the columnar cushioning material 10 is inserted in the center. The cushioning material 10 is also made of styrene foam or the like, like the cushioning material 9.

The method shown in FIG. 3 is suitable for a case where the earth pressure is small. According to this method, the number of the H-shaped steel members 5 can be reduced to half, so that the steel material can be saved and the cost can be reduced. Also, H
Since the buffer material 10 is also inserted into the hole 4b into which the shape steel 5 is not inserted, the buffer material is provided in all the holes, and the effect of vibration absorption is not impaired.

FIG. 4 shows another embodiment of the present invention, and is an example in which a space between holes drilled at intervals is filled with mortar. Reference numeral 11 denotes an injection pipe,
And is inserted into the hole 41 together with the H-beam 5 in the step of FIG. After the steps of FIGS. 1 (c) and 1 (d), as shown in FIG. 4, a mortar 13 as cement milk is injected into the ground 1 through a nozzle 12 provided at the lower end of the injection pipe 11. While spraying at a degree (for example, 3 to 5 MPa),
The injection pipe 11 is pulled up. The mortar 13 is the same as the mortar 8 filled in the hole 41.

As a result, the mortar 13 injected into the ground 1 reaches the hole 42 where the construction is completed, and the space between the hole 41 and the hole 42 is filled with the mortar 13. FIG.
Shows a horizontal sectional view in this case, in which the buried mortar 13 functions as a blocking wall such as a water blocking wall.

According to this, since a plurality of holes are drilled at intervals, the number of holes and the number of H-section steels are reduced, so that the number of steps and the construction cost are reduced, and the construction period can be shortened. In addition, since the space between the holes is filled with the mortar 13, the blocking function such as the water stopping property is not impaired.

FIG. 6 shows another embodiment of the present invention. In FIG. 4, the injection pipe 11 is supported inside the casing pipe 2 instead of supporting the injection pipe 11 on the H-section steel 5. It is an example. The nozzle 12 at the tip of the injection pipe 11 protrudes from a discharge hole (not shown) formed in the casing pipe 2. When the casing pipe 2 is pulled out, the injection pipe 11 is also pulled up together. In this process, the mortar 13 is injected from the nozzle 12 into the ground 1 to complete the construction with the hole 43 as in the case of FIG. The space between the holes 44 is filled with the mortar 13.

Although only one nozzle 12 is provided in FIGS. 4 and 6, a plurality of nozzles 12 may be provided. Further, the mortar 13 may be jetted in both directions by providing the nozzles 12 on both the left and right sides.

[0026]

According to the present invention, since the mortar pile is formed by using the casing drilling method, the boring machine may be small and does not require a large space for the work. Also, since no loud noise is generated and no ground is raised, there is no adverse effect on neighboring houses. For this reason, it is an effective construction method particularly for construction on narrow roads.

Further, according to the present invention, a small-diameter hole can be easily drilled, so that it is possible to cope with a small-scale construction, and since the H-section steel can be smoothly inserted by the casing pipe, the work can be efficiently performed. There are advantages to do.

Further, by providing a cushioning material to the H-section steel,
Vibration transmitted through the ground can be absorbed. in this case,
By inserting the H-shaped steel into the plurality of holes at intervals and inserting the cushioning material into the holes where the H-shaped steel is not inserted, the steel material can be saved, the cost can be reduced, and the vibration absorbing effect can be maintained.

Further, by drilling the holes for inserting the H-shaped steel at intervals, and by filling the space between the holes with mortar, the man-hour and cost can be reduced, and the function as a blocking wall can be maintained. .

[Brief description of the drawings]

FIG. 1 is a process diagram showing an example of a method for forming a mortar pile according to the present invention.

FIG. 2 is a horizontal sectional view showing another embodiment of the present invention.

FIG. 3 is a horizontal sectional view showing another embodiment of the present invention.

FIG. 4 is a vertical sectional view and a horizontal sectional view showing another embodiment of the present invention.

FIG. 5 is a horizontal sectional view showing a state in which a space between holes is filled with mortar.

FIG. 6 is a vertical sectional view and a horizontal sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Casing pipe 3 Bit 4 hole 5 H-section steel 6 Pump device 7 Injection hose 8 Mortar 9 Buffer material 10 Buffer material 11 Injection pipe 12 Nozzle 13 Mortar M Mortar pile

Continued on the front page (72) Inventor Daisaburo Uga 7-6, Bashizashi-cho, Tennoji-ku, Osaka-shi, Osaka Prefecture F-term (reference) 2D040 AA01 AA06 AB01 BB03 CA01 2D041 AA03 DA12 DA13 DB02 EA02 EA04 EB05 FA02 2D049 EA01 EA02 EA07 FB03 FB13 FB20 GA02 GA03 GB08 GC11 GE03 2D050 AA13 CA04 CB42 EE08

Claims (4)

[Claims] 1. A method for forming a mortar pile, comprising the following steps (a) to (d). (A) Step of drilling a ground using a casing pipe (b) Step of inserting an H-shaped steel into the drilled hole (c) Driving mortar into the hole where the H-shaped steel is inserted Step (d) Step of pulling out casing pipe after placing mortar 2. The method for forming a mortar pile according to claim 1, wherein the H-shaped steel is provided with a cushioning material. 3. An H in which a cushioning material is attached to a plurality of drilled holes.
The method according to claim 1, wherein the section steels are inserted at intervals, and a buffer material is inserted into a hole in which the H-section steel is not inserted. 4. A hole for inserting an H-section steel is formed at intervals, and mortar is injected into the ground by an injection pipe inserted into the hole to fill the space between the holes with mortar. The method for forming a mortar pile according to claim 1.