JPH03257280A - Construction method of vertical shaft - Google Patents

Abstract

PURPOSE:To construct a vertical shaft without generating noise and vibration by engaging a jack with tensile material fixed in plural borings through grout material to pressure-feed casings downward. CONSTITUTION:Plural borings are provided in such a way as to be positioned outside the peripheries of pressed-in casings A, A, as well a tensile material 6, 6 are inserted into the respective borings, and grout material 8 is injected therein for fixation. The casings A, A are then conveyed in so as to be accommodated inside the tensile material 6, 6. The inside of the casings A, A are drilled, and soil is removed, as well as the casings A, A are pressure-fed downward by a jack engaged with the tensile material 6, 6.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for constructing a shaft.

[Conventional technology]

Conventionally, the methods of constructing starting, intermediate, and reaching shafts and manholes for water and sewage systems during propulsion work include first driving steel sheet piles around the shaft, then excavating the inside of the steel sheet piles and removing the earth; The casing is fitted inside a tightening band that is supported by a weighted arm of heavy equipment via a jack.
Next, the earth and sand inside the casing is removed using a bucket, and the casing is pressed in and lowered using jacks, or a frame-shaped base with a weight is placed at the construction point, and then the tightening on the base is done by tightening the casing inside the band. There is a construction method in which after the casing is fitted, the earth and sand inside the casing is removed using a packet or the like, and the casing is pressed in and lowered using a jack.

[Problem to be solved by the invention]

When using steel sheet piles, large heavy machinery is required to drive the long sheet piles, so the work space becomes large, and the driving method generates large noises and vibrations, and the distortion of the steel sheet piles causes damage to the surrounding area. There have been problems in that the steel sheet piles may sink and have a negative impact on surrounding structures, or that the steel sheet piles may fall over and the wires may be cut when the steel sheet piles are pulled out, resulting in danger.

When using heavy equipment with a band for tightening, the equipment is equipped with an arm with a weight, which increases the size and requires a large work space, and there are problems such as the inability to use the heavy equipment for other purposes. there were.

Further, there are problems in that it takes time and effort when a larger reaction force is required on the ground, and there is a limit to the increase in the number of weights.

When using a base with a weight, heavy machinery is used for loading and unloading, which is extremely time-consuming, and if a large reaction force is to be obtained as described above, there is a problem in that the labor-intensive work of increasing the weight is required. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for constructing a shaft that can be constructed without noise and vibration, and that can obtain a reaction force depending on the ground without using a weight.

[Means to solve the problem]

In order to achieve the above object, this invention provides a plurality of boreholes extending from the ground to the ground so as to be located outside the periphery of a press-fit casing, and the tensile material inserted into each borehole is fixed by injection grouting material. After that, the casing is carried in so that it fits inside the tension material, the inside of the casing is excavated, the soil is removed, and the casing is pressed in and lowered by the action of each jack engaged with the tension material. It was designed so that a vertical shaft could be constructed.

In addition, a plurality of boring holes are provided from the ground to the ground so as to be located outside the periphery of the press-fit casing, and the tension material inserted into each of these bore holes is fixed with the injection grout material, and then settled inside the tension material. The casing is carried in, the inside of the casing is excavated, and the casing is press-fitted and lowered by the action of each jack engaged with the tension member, and the lower edge of the casing is expanded by the expanding blade at the lower edge of the casing. A necessary gap is formed between the entire outer circumference and the borehole wall, and muddy water is injected into this gap to construct the shaft.

[Effect]

The inside of the casing is excavated and soil is removed, and a shaft is constructed while the casing is pressed in and lowered by acting on a jack engaged with a tension member.

Further, the inside of the casing is excavated and soil is removed, and the casing is press-fitted and lowered by applying a jack engaged with the tension member.

Forming a gap between the entire outer periphery of the casing and the hole wall by the lower edge expanding blade of the casing to be press-fitted and lowered,
The muddy water injected into the rj1 gap reduces the earth pressure acting on the casing and prevents the wall of the cut hole from collapsing.

〔Example〕

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 15 of the accompanying drawings.

First, a plurality of boring holes 1 are provided from the ground to a predetermined depth so as to be located outside the enclosure of the press-fit casing A.

As shown in Fig. 1, the above-mentioned borehole 1 is constructed by driving a self-propelled excavator 2 and installing a steel pipe 4 which is raised and lowered using a leader mast 3 as a guide.After confirming the verticality, the above-mentioned steel pipe is 4 to excavate from the ground to a predetermined depth underground.

At this time, as shown in FIG. 2, a method such as injecting water from the lower end of the steel pipe 4 is used to smoothly excavate.

In addition, if the steel pipe 4 is short, the above-mentioned steel pipe 4 may be added by a screwing method or the like.

Then, the motor 5 is separated from the upper end of the steel pipe 4, and the third
A steel pipe 4 is left in the borehole 1 as shown in the figure.

Next, as shown in FIG. 4, a tensile material 6 such as a steel rod is inserted into the remaining sea bream pipe 4, and as shown in FIG. A press-fit hose 7 of grout material is inserted, and the tip of the hose 7 reaches near the lower end of the steel pipe 4.

Thereafter, as shown in FIGS. 6 and 7, the grout material 8 is press-fitted while gradually pulling up the hose 7. When the press-fitting reaches a predetermined range above the bottom of the borehole 1, the press-fitting is stopped and the grout material 8 is pressed into the hose 7. Only the anchor 7 is pulled out, and then the steel pipe 4 is pulled out to form an integral anchor 9 as shown in FIG.

The tension member 6 forming the anchor unit 9 was installed on the outer quadrant of the peripheral wall of the casing A as shown in FIG. Just increase the number.

After fixing the tension material 6, the casing A is set up on the ground inside the tension material 6, and then, as shown in FIG. 10 is engaged.

The above engagement method involves placing two sets of U-shaped steels 11 on the casing A, as shown in FIGS. 6 to intervene.

After that, the tensile material 6 is passed through the central through hole 12, the jack 10 is placed on the mold 1111, and then the tensile material 6 is placed on the mold 1111.
Although this is done by screwing in the nut 13 from the upper end, other methods other than the above may be used.

However, in addition to excavating the inside of the casing A and removing soil, the uniform stretching action of each jack 10 causes the casing A to be removed.
Send a huge amount of information.

When the jack 10 reaches its maximum extension, it is contracted and then the nut 13 is screwed in again.

Furthermore, the casings A are successively added as shown in FIG.

The upper and lower edges of the casing A to be added are connected by welding or bolting, and the casing A is made of metal or concrete.

In addition, a packet 15 of deep am cutting metal 14 is added to the excavated soil (
(as shown in FIG. 14) was used, but the soil may be excavated and removed by a method other than the above.

After completing the above steps and burying casing A underground,
As shown in FIG. 15, a foundation concrete 16 is placed at the bottom of the lowest casing A, and after the jacks 10 and steel molds 11 are removed, a portion of the tension member 6 slightly below the ground is cut.

Note that the casing A may have a square shape, an oval shape, etc. other than the circular shape shown in the figure.

Next, a second embodiment will be described based on FIGS. 16 to 18 of the accompanying drawings.

A drilling diameter expanding blade 21 is provided outside the entire lower edge of the casing A to form a gap 23 between the outer periphery of the casing A, which is press-fitted and lowered through the procedure of the first embodiment, and the wall of the excavation hole 22. Then, by operating the sand pump 25, the muddy water in the pit 24 is pumped through the vibrator 26 to the outside of the lower edge of the casing A to fill the gap 23, and the filled muddy water reduces the earth pressure. This prevents the wall of the excavation hole 22 from collapsing.

〔effect〕

As described above, according to the method for constructing a shaft according to the present invention, the casing is press-fitted and lowered by engaging the jack with the tensile material fixed in the ground through the grouting material, so the shaft can be constructed without noise or vibration. It can be installed even in narrow spaces.

In addition, it can be constructed regardless of groundwater, and
It also shortens the construction period and can be constructed at low cost.

Furthermore, the expanding blade creates a gap between the outer periphery of the casing and the excavation hole, and this gap is filled with muddy water, which reduces earth pressure and allows for smooth press-in and lowering of the casing. Collapse of the borehole wall can be prevented.

[Brief explanation of drawings]

The drawings show the shaft construction method according to the present invention, and FIGS. 1 to 8 are longitudinal sectional front views showing the process of fixing the tension material, and FIG. 9 shows the casing by engaging the tension material with a jack. 10 is an enlarged front view showing the main parts of the same as above, 11 is the same plan view, 12 is an enlarged side view of the jack, and 13 to 15 are vertical shafts. 16 is a vertical sectional front view of another embodiment, FIG. 17 is an enlarged vertical sectional front view of the enlarged diameter blade, and FIG. 18 is a sectional front view of the same. A... Casing, 2... Excavator, 4... Steel pipe, 6... Tensile material, 8... Grout material, 10. ... Jacket, 12 ... Through hole, 21 ... Expanding blade, 23 ... Gap, 1 ... Boring hole, 3 ... ... Leader mast, 5 ... Motor 7 ... Hose, 9 ... Anchor integrated, 11 ... Steel mold, 13 ... Nut, 22...Drilling hole, 26...Pipe. Figure 1 Figure 4 Figure 5 Figure 10 Figure 12 Figure 14

Claims (2)

[Claims] (1) A plurality of boring holes are provided from the ground to the ground so as to be located outside the periphery of the press-fit casing, and after the tensile material inserted into each of these boring holes is fixed with injection grout material, the tensile material is placed inside the tensile material. A method for constructing a vertical shaft, in which a casing is carried in so that it fits, the inside of the casing is excavated, the soil is removed, and the casing is pressed in and lowered by the action of each jack engaged with a tension member. (2) A plurality of boreholes are provided from the ground to the ground so as to be located outside the periphery of the press-fit casing, and after the tensile material inserted into each borehole is fixed with the injection grout material, The casing is carried in so that it fits, the inside of the casing is excavated and removed, and the casing is pressed in and lowered by the action of each jack engaged with the tension member, and the lower edge expanding blade of the casing is used to remove the casing. A shaft construction method in which a required gap is formed between the entire outer periphery of the shaft and the borehole wall, and muddy water is injected into this gap.