JP2003193456A - Apparatus and construction method for pressing in drain material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a construction method for pressing in a drain material, which allow a press-in pipe body to be easily pressed in to a prescribed drain-material press-in depth, by emitting a jet of excavating water from a lower end opening of an excavating water supply channel forming body so as to excavate hard stratum, in the presence of the hard stratum in the ground, and which consequently, enable a drastic reduction in the time and cost of execution of work for pressing in the drain material. <P>SOLUTION: This apparatus is equipped with: the press-in pipe body being pressed into the ground in a state of covering the periphery of the vertically elongated drain material; and the excavating water supply channel forming body for conducting underground excavation by emitting the jet of the excavating water from a lower end opening of an excavating water supply channel which is formed along the press-in pipe body. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a drain material press-fitting device and a drain material press-fitting method.

[0002]

2. Description of the Related Art Conventionally, by injecting a drain material into soft ground or sand ground that may be liquefied, excess pore water generated during an earthquake is caused to flow into the drain material early and the excess pore water pressure is increased. There is a liquefaction prevention construction method that suppresses the rise of water.

As one form of the drain material press-fitting device for press-fitting the drain material into the ground, a leader provided in a base machine is attached with a press-fitting pipe body extending in the vertical direction, and the press-fitting pipe body is vertically mounted in the press-fitting pipe body. Insert the drain material to be stretched in, press the press-fitting pipe body at the drain material press-fitting position in the same state, and lift the press-fitting pipe body when the press-fitting pipe body is press-fitted to the predetermined press-fitting depth of the drain material, thereby removing the drain material. There are some that are left in the ground.

[0004]

However, in the above-described drain material press-fitting device, it is sufficient that the soft geology is continuous in the depth direction so that the press-fitting pipe body can be easily press-fitted, but the hard material is hard on the way. If there is such a stratum, there is a problem that the press-fitting work of the press-fitting pipe body is difficult, or the press-fitting pipe body cannot be press-fitted further and the drain material cannot be press-fitted to a predetermined press-fitting depth.

For example, as shown in FIG. 1, a landfill layer 3 is formed on the alluvial layer 2 laminated on the dip layer 1, a sea sand layer 4 is formed on the landfill layer 3, and further, When the granulated slag layer 5 is formed on the sea sand layer 4 to form the landfill U, the landfill layer 3 which is a soft soil layer may be buried. 6
Is a tarpaulin.

In such a case, the landfill soil is landfilled on the buried water granulated slag layer 5 to form the landfill layer 3 whose ground surface is at the same level as that of the unburied water granulated slag layer 5. A sea sand layer 4 and a granulated slag layer 5 are laminated on the granulated slag layer 5 and the landfill layer 3.

As described above, when the water granulated slag layer 5 is formed at the ground surface position and the buried position, the water granulated slag layer 5 at the ground surface position is previously prepared by a drilling device (not shown). By excavating and forming a pre-drilled hole (not shown) at a position where the drain material D is press-fitted, the drain material D can be easily press-fitted through the pre-drilled hole, but at a buried position. It is very complicated to form the pre-drilled holes in the water granulated slag layer 5 in advance, which requires a long construction time, and also requires a great construction cost.

This is because the buried water granulated slag layer 5 is searched and specified in advance, and a drill for drilling (not shown) is advanced by the excavator to the position of the specified water granulated slag layer 5 to form a pre-drilled hole. This is because it takes a lot of time and labor to form the same, pull up the drill for drilling once, and then press-fit the drain material D.

[0009]

Therefore, in the present invention, a press-fitting pipe body that is press-fitted into the ground in a state of covering the periphery of a drain material that extends in the vertical direction and a drainage material that is formed along the same press-fitting pipe body. The present invention provides a drain material press-fitting device, comprising: a drilling water supply channel forming body that ejects drilling water from the lower end opening of the drilling water supply channel to excavate underground.

The present invention is also characterized by the following configurations.

The drilling water supply flow path forming body is formed of a pressurized water supply section and a nozzle section connected to the tip of the pressurized water supply section, and the nozzle section is located above the lower end section of the press-fitting pipe body. Placed in.

The pressing crushing body is extended downward from the press-fitting pipe body, and the sharpened lower end of the pressing crushing body is arranged below the lower end of the press-fitting pipe body.

Further, according to the present invention, the press-fitting pipe body that covers the periphery of the drain material extending in the vertical direction is built in the drain material press-fitting position, and the press-fitting pipe body is press-fitted into the ground.
Depending on the hardness of the geology, the drilling water pressurized to the required pressure is ejected to excavate the ground in advance, and when the drain material is press-fitted to the specified press-fitting position, the drain material is left in the ground. It is intended to provide a drain material press-fitting method characterized by pulling out a press-fitting pipe body.

Further, the feature is that the pressure of the drilling water is set to a low pressure when the geological hardness is low, and the pressure of the drilling water is changed to a high pressure when the geological hardness is high.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

That is, the drain material press-fitting device according to the present invention is formed along with the press-fitting pipe body that is press-fitted into the ground while covering the periphery of the drain material that extends in the vertical direction. And a drilling water supply channel forming body for ejecting drilling water from the lower end opening of the drilling water supply channel to excavate the ground.

The drilling water supply flow path forming body is formed of a pressurized water supply section and a nozzle section connected to the tip of the pressurized water supply section, and the nozzle section is more than the lower end section of the press-fitting pipe body. The pressing crushing body is disposed at an upper position and extends downward from the press-fitting pipe body, and the sharpened lower end of the pressing crushing body is arranged below the lower end of the press-fitting pipe body.

Further, in the drain material press-fitting method according to the present invention, a press-fitting pipe body which covers the periphery of the drain material extending in the vertical direction is built in the drain material press-fitting position and the press-fitting pipe body is press-fitted into the ground. At the same time, according to the hardness of the geology, the drilling water pressurized to the required pressure is ejected to excavate the ground in advance, and when the drain material is press-fitted to the predetermined press-fitting position, the drain material is left in the ground. I try to pull out the press-fitting pipe while keeping it.

When the geological hardness is low, the pressure of the drilling water is set to a low pressure, and when the geological hardness is high, the pressure of the drilling water is changed to a high pressure.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows a drain material press-fitting apparatus according to the present invention. The drain material press-fitting apparatus A has a leader 11 installed upright on a base machine 10 and a press-fitting apparatus extending vertically in the leader 11. Attach the tube body 12 so that it can move up and down, and press fit the tube body 12
A drilling water supply flow path forming body 13 is provided along the line.

As shown in FIGS. 2 to 5, the press-fitting pipe body 12 has a rectangular tubular press-fitting pipe body 14 extending vertically.
And a cylindrical tip 15 detachably attached to the tip of the press-fitting pipe main body 14, and a drain material guide pipe connected to the press-fitting pipe main body 14 with the lower end communicating with the tip 15. And part 16.

As shown in FIG. 2 and FIG. 3, a pair of left and right pressing crushing bodies 17, 17 are integrally attached to the lower end of the outer surface of the press-fitting pipe main body 14 at the corner portions facing left and right, and The crushed body 17, 17
7a and 17a are arranged below the lower end of the press-fitting pipe body 12, that is, the lower end of the pointed portion 15.

The tip 15 has a stepped small-diameter fit at the upper end.
The connecting portion 15a is formed, and the fitting / connecting portion 15a is inserted into the press-fitting pipe body 14
It can be inserted into the opening at the lower end from below, and a pair of front and rear through holes 18, 18, 19, and 19 are formed in the same fitting / connecting portion 15a and the press-fitting pipe main body 14 in the left-right direction. A pair of front and rear locking pins 20, 20 extending in the left-right direction are inserted into the holes 18, 18, 19, 19 so that they can be freely inserted and removed, and the fitting / connecting portion 15a
And the press-fitting pipe body 14 are detachably connected.

The pointed portion 15 is formed into a pointed cylindrical shape by gradually reducing the front-rear width of the lower half portion downward, and a drain member drawing slot 15b is formed at the lower end to form the drain member. The drain material D can be pulled out from the pull-out long hole 15b.

As shown in FIG. 4, the drain material guide pipe portion 16 is formed in an elliptic tubular shape extending in the vertical direction, and is formed at the left and right side corners of the inner peripheral surface of the press-fitting pipe body 14 on the long diameter side left and right side edges. The pipe spaces S, S are formed between the front and rear corners of the inner peripheral surface of the press-fitting pipe main body 14 and the front and rear side edges on the short diameter side while the parts are brought into contact with each other.

Here, the drain material D is formed in a narrow strip shape with a synthetic resin or the like so that it can be inserted into the drain material guide pipe portion 16 and is covered and guided by the drain material guide pipe portion 16 so as to be vertically moved. It is slidable in any direction.

The drain material D is the base machine 10
It is fed from a feeding reel (not shown) arranged above, and the tip end portion d is inserted from above into the drain material guide pipe portion 16 → the pointed head 15 → the drain material pull-out long hole 15b,
Tip d drawn from the drain material slot 15b
Is engaged with the anchor piece 21 formed in a three-pronged shape in a folded shape, and the tip portion d of the drain material D, to which an upward tensile force is applied in the same state, is attached to the lower end surface 15c of the pointed portion 15 on the anchor piece. twenty one
It is designed to be locked via.

Then, when the press-fitting pipe body 12 is lifted up from the state of being press-fitted into the ground, the anchor piece 21 is locked in the ground, and the drain material D is left in the ground, and the press-fitting pipe body 12 is pressed. The body 12 can be lifted.

Further, the drilling water supply channel forming body 13 is shown in FIGS.
As shown in FIG. 5, the pressurized water supply unit 22 and the pressurized water supply unit
It is formed from a nozzle portion 23 connected to the tip portion of 22.

The pressurized water supply unit 22, as shown in FIG.
Connect the base end of the water supply hose 25 to the water source 24 such as a water supply tank, and connect the hose 26,2
The base ends of 6 are connected, and the nozzles 23, 23 are connected to the tips of the hoses 26, 26 with built-in press-fitting pipes.

Here, at the lower end of the outer surface of the press-fitting pipe body 14,
Also, the front and rear side corners are integrally formed with the pipe passage forming portions 14a, 14a that bulge outward, respectively, and the pipe passage forming portions 14a, 14a are formed.
The upper end openings 27a, 27a therein communicate with the inside of the piping space S, S formed in the press-fitting pipe main body 14, and the middle portions 27b, 2
7b extends downward along the outer peripheral surface of the press-fitting pipe body 14, and the lower end openings 27c, 27c form pipe lines 27, 27 that open downward on the outside of the press-fitting pipe body 14. ,
The tips of the hoses 26, 26 with a built-in press-fitting pipe body are inserted and piped in the respective pipe lines 27, 27.

As described above, the hose 26 having a built-in press-fitting tube is built in the press-fitting tube 12 and the pipe passage forming portion 14a, so that the press-fitting tube 12 is built in when the press-fitting tube 12 is vertically slid in the ground. The hose 26 is prevented from being damaged.

The nozzle portion 23 is connected to the tip portion of the hose 26 with a built-in press-fitting pipe body, and the ejection hole 23a is opened downward along the axis of the press-fitting pipe body 12. twenty three
“A” is arranged at a lower end of the press-fitting pipe body 12, that is, at a position higher than a lower end of the pointed portion 15.

In this way, as shown in FIG. 6, the hose 26 with a built-in press-fitting tube and the nozzle portion 23 are connected in series,
With these, the drilling water supply passage 28 is formed along the press-fitting pipe body 12, and the drilling water W is ejected from the ejection hole 23a of the nozzle portion 23, which is the lower end opening of the excavation water supply passage 28, to make it hard. By excavating the water granulated slag layer 5 which is the stratum, the press-fitting pipe body 12 can be easily press-fitted.

At this time, since the lower end sharpened portions 17a, 17a of the pair of left and right pressing crushing bodies 17, 17 are arranged at a position lower than the lower end of the pointed portion 15, they are preceded by the press-fitting pipe body 12 to be press-fitted. And the pressure crushing bodies 17, 17 crush the water granulated slag layer 5 in advance, and subsequently, a pair of left and right pressure crushing bodies 17, 17 and the press-fitting pipe main body 14
A pair of front and back nozzles arranged 90 degrees apart in the circumferential direction
Since the drilling water is jetted from 23,23, the drilling force acts on the hard granulated slag layer 5 in good balance, and the granulated slag layer 5 can be efficiently drilled.

Although two nozzles 23 are provided in this embodiment, the number of the nozzles 23 is not limited to this, and the number of nozzles 23 can be increased or decreased as needed, and the arrangement position is appropriately pressed. It can be set in cooperation with the crushing body 17 so that the excavating force acts on the hard stratum in good balance.

Next, a construction procedure for press-fitting the drain material D into the landfill U will be described with reference to FIGS. 1, 6 and 7.

(1) The press-fitting pipe body for moving the base machine 10 to cover the periphery of the drain material D extending vertically.
Build (set) 12 into the drain material press-fitting position
(A).

(2) Operate a generator (not shown) (b), start a water supply pump (not shown) (c), set a hose reel (not shown) (d), and nozzle section twenty three
The construction is started by starting the ejection of the drilling water W set to a lower pressure (e) (f). At this time, measurement of the ejection pressure of the drilling water W and the like is also started.

(3) Water granulation When the water reaches the slag layer 5 (g), jetting of the drilling water W set to a high pressure from the nozzle portion 23 is started (h), and water is granulated by the high pressure drilling water W. The excavation of the slag layer 5 is started (i). In FIG. 1, 7 is an excavation hole excavated by the excavation water W.

At this time, the press crushing bodies 17, 17 reach the water granulated slag layer 5 in advance prior to the press-fitted pipe body 12 to be press-fitted, and the water granulated slag layer 5 is pressed and partially crushed. Then, as the drilling water is subsequently ejected from the nozzle portion, the pressure crushing bodies 17, 17 and the drilling water W cooperate with each other to excavate the water granulated slag layer 5, resulting in the water granulation. The slag layer 5 can be easily excavated, and the press-fitting work of the press-fitting pipe body 12 can be efficiently performed.

(4) When the press-fitting pipe body 12 penetrates the granulated slab layer 5 (j), the pressure setting of the drilling water W is switched to a low pressure (k), and the press-fitting pipe body 12 is continuously press-fitted. To do.

(5) When the landfill layer 3 is reached (l), ejection of high-pressure drilling water is stopped (m).

(6) Reach Alluvium 2 (n), and
When it reaches the dipping layer 1 (o), it is judged that the press-fitting pipe body 12 has reached a predetermined press-fitting position, and the lifting operation of the press-fitting pipe body 12 is started (p).

(7) The drain material D built in the press-fitting pipe body 12 and press-fitted into the ground has also reached a predetermined press-fitting position, and when the press-fitting pipe body 12 is pulled upward (p), the drain material D With the anchor piece 21 connected to the tip of the drainage material D being retained in the ground and the drain material D being left in the ground, the press-fitting pipe body 12 can be pulled up, and the drain material D is reclaimed into the landfill U. The work of burying the drain material D is completed by cutting the work piece in a state of being projected by a required length (q).

(8) The base machine 10 is moved (r), and the press-fitting pipe body 12 that covers the periphery of the drain material D extending in the vertical direction is installed (set) at the next drain material press-fitting position.

(9) The above operations (2) to (8) are repeated a required number of times.

(10) Cure (s).

As described above, in the case of the landfill layer 3, the alluvium 2 and the alluvial deposit 1 having low geological hardness, the low-pressure drilling water W is jetted to promote the smooth press-fitting of the press-fitting pipe body 12. In the case of the granulated slag layer 5 having a high geological hardness, the high-pressure drilling water W is ejected to efficiently excavate the hard granulated slag layer 5, and The press-fitting pipe body 12 can be press-fitted.

Therefore, it is possible to press-fit the drain material D while excavating a hard stratum without excavating a hard stratum such as the water granulated slag layer 5.
The burying work cost of the drain material D can be significantly reduced, and the burying work efficiency can be remarkably improved.

[0052]

According to the present invention, the following effects can be obtained.

According to a first aspect of the present invention, there is provided a drain material press-fitting device, wherein a press-fitting pipe body is press-fitted into the ground while the periphery of a drain material extending vertically is covered, and the drain material press-fitting device is installed along the press-fitting pipe body. And a drilling water supply channel forming body for ejecting drilling water from the lower end opening of the drilling water supply channel thus formed to excavate the ground.

Therefore, when there is a hard formation in the ground, the press-fitting pipe body is predetermined by ejecting the drilling water from the lower end opening of the drilling water supply channel forming body and excavating the hard formation. It can be easily pressed down to the drain material press-in depth.

As a result, the construction time and the construction cost for press-fitting the drain material can be greatly reduced.

In the drain material press-fitting device according to the second aspect of the present invention, the drilling water supply flow path forming body is formed of the pressurized water supply section and the nozzle section connected to the tip of the pressurized water supply section. The nozzle portion is arranged above the lower end portion of the press-fitting pipe body.

Therefore, while the press-fitting pipe body is being press-fitted,
Even if the press-fitting pipe collides with a hard formation, the nozzle is located above the lower end of the press-fitting pipe, so that the nozzle can be prevented from being damaged. As a result, the function of ejecting the drilling water in the nozzle portion can be ensured satisfactorily.

As a result, in such a case, the press-fitting pipe body can be easily press-fitted by promptly ejecting the drilling water from the nozzle portion to excavate the hard formation.

In the drain material press-fitting device according to the third aspect of the present invention, the pressure crushing body is extended downward from the press-fitting pipe body, and the sharpened lower end of the pressure crushing body is positioned lower than the lower end of the press-fitting pipe body. It is located in the lower position.

Therefore, when a hard formation exists,
The pressure crushing body crushes the hard strata in advance prior to the press-fitting pipe body to be press-fitted, and subsequently the drilling water is ejected from the nozzle part, so that the pressure crushing body and the drilling water work together to make it hard. Therefore, the hard formation can be easily excavated, and the press-fitting operation of the press-fitting pipe can be efficiently performed.

In the drain material press-fitting method according to the present invention as defined in claim 4, a press-fitting pipe body which covers the periphery of the drain material extending in the vertical direction is built in the drain material press-fitting position, and the press-fitting pipe body is underground. In addition to press-fitting into the ground, the drilling water pressurized to the required pressure is ejected according to the hardness of the geology, the ground is pre-excavated, and the drain material is pressed into the predetermined press-fitting position. The press-fitting pipe body is pulled out while it is left inside.

As described above, in the press-fitting operation of the press-fitting pipe body, the hard stratum is excavated by ejecting the drilling water pressurized to a required pressure according to the hardness of the geology, and the press-fitting pipe body is press-fitted. It is possible to ensure good efficiency.

As a result, the work efficiency of press-fitting the drain material can be improved and the construction cost can be reduced.

In the drain material press-fitting method according to the fifth aspect of the present invention, the pressure of the drilling water is set to a low pressure when the geological hardness is low, and the pressure of the drilling water is high when the geological hardness is high. So that it can be changed to.

In this way, when the geological hardness is low, low-pressure drilling water is ejected to promote smooth press-fitting of the press-fitting pipe body, and when the geological hardness is high, high-pressure drilling is performed. While ejecting water to efficiently excavate the hard formation, it is possible to press fit the press-fitting pipe into the hard formation,
It is possible to improve the efficiency of burying drain material.

[Brief description of drawings]

FIG. 1 is an explanatory view of a working state by a drain material press-fitting device according to the present invention.

FIG. 2 is a front view of a press-fitting pipe body provided in the drain material press-fitting device.

FIG. 3 is a view taken along the line I-I of FIG.

FIG. 4 is a sectional view taken along line II-II of FIG.

FIG. 5 is a partially cutaway side view of the press-fitting pipe body.

FIG. 6 is an explanatory view of an excavation work state by the press-fitting pipe body.

FIG. 7 is a flowchart showing a construction procedure for burying a drain material.

[Explanation of symbols]

A drain material press fitting device D drain material W drilling water 10 base machine 11 reader 12 Press-fit tube 13 Drilling water supply channel forming body

Claims (5)

[Claims] 1. A press-fitting pipe body which is press-fitted into the ground in a state where a drain material extending in the vertical direction is covered, and a lower end opening portion of a drilling water supply passage formed along the press-fitting pipe body. A drain material press-fitting device, comprising: a drilling water supply flow path forming body that further ejects drilling water to excavate underground. 2. The drilling water supply passage forming body is formed of a pressurized water supply section and a nozzle section connected to a tip section of the pressurized water supply section, and the nozzle section is more than the lower end section of the press-fitting pipe body. The drain material press-fitting device according to claim 1, wherein the drain material press-fitting device is arranged at an upper position. 3. The pressing crushing body is extended downward from the press-fitting pipe body, and the sharpened lower end of the pressing crushing body is arranged at a position lower than the lower end of the press-fitting pipe body.
Alternatively, the drain material press-fitting device described in 2. 4. A press-fitting pipe body which covers the periphery of a drain material extending in the vertical direction is installed at a drain material press-fitting position,
The same press-fitting pipe is press-fitted into the ground, and according to the hardness of the geology, the drilling water pressurized to the required pressure is ejected to pre-dig the ground, and the drain material is press-fitted to the predetermined press-fitting position. By the way, a drain material press-fitting method characterized in that the press-fitting pipe body is pulled out while the drain material is left in the ground. 5. The pressure of drilling water is set to a low pressure when the hardness of the geology is low, and the pressure of the drilling water is changed to a high pressure when the hardness of the geology is high. Drain material press-fitting method.