JPH0536567B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a paper drain construction device used for improving soft ground. This device relates to a device in which a paper insertion mandrel is inserted and held, the mandrel is driven into the ground, and after driving the mandrel to a predetermined depth, only the mandrel is pulled out, leaving the paper in the ground.

(Prior art and its problems) In the conventional paper drain construction equipment, the mandrel for paper insertion is suspended from the top of the leader by a wire for pulling out the bare paper, and the driving drive means (a winch device including the driving wire or the mandrel) is connected to the mandrel. In the past, driving was performed directly using a vibrator (exciter that generates vibrations), but if the length of the mandrel became long enough, buckling would occur during driving. The mandrel needs to be thick, and as the mandrel is driven into the ground, the paper that is being supplied hanging down from near the top of the leader is exposed in the air, and as a result, the paper is directly exposed to wind pressure and the paper is pushed into the supply roller. In order to prevent the paper from coming off the mandrel, it is necessary to interpose a telescopic windbreak pipe with a bellows structure between the top of the leader and the top of the mandrel. Due to the installation of the windbreak pipe, the height of the leader has to be increased by at least the length of the windbreak pipe when it is retracted. in this way,
In the conventional device, it is necessary to use a special pipe material with a considerably thick wall as the mandrel, which makes the mandrel expensive, and the installation of a windbreak pipe increases equipment costs.

(Technical means for solving the problems) The present invention solves the problems of the conventional device described above, and the technical means for this purpose is to provide a guide tube 3 in which an opening groove 5 is provided over the entire length. is fixed to the leader 1, a paper insertion mandrel 6 is inserted into the guide tube 3, and a support member 7 attached to the upper end of the mandrel is projected from the opening groove 5 to the outside of the guide tube 3. The supporting member 7 is connected to a mandrel driving means and a mandrel pulling driving means.

(Example) Examples of the present invention will be described below based on the drawings.

FIGS. 1 and 2 show a partially sectional side view and a front view, respectively, of a double-barreled paper drain construction device according to the present invention, and in these figures, 1 stands on a crawler-type mobile machine 2. configured reader,
Reference numerals 3, 3 denote a pair of left and right cylindrical guide tubes fixed in parallel to the leader 1 via mounting frame members 4, and these guide tubes 3, 3 are provided with opening grooves 5,
5 is formed over the entire length of each.
Reference numerals 6, 6 denote mandrels for inserting paper that are slidably inserted into the guide tubes 3, 3, and the upper ends of these mandrels 6, 6 are integrally interconnected by a support member 7. The member 7 protrudes from the open grooves 5, 5 of the guide tubes 3, 3, and as the mandrels 6, 6 move up and down, the open grooves 5,
It is designed to slide up and down along 5.
8 is a driving wire, one end of which is connected to the support member 7.
The other end is wound around the drum of a winch 9 installed on the mobile machine base 2. Reference numeral 10 denotes an air spring device as a hydraulic reciprocating means for mandrel driving, which is provided on the movable machine stand 2 located on the front side of the winch 9, and is connected to both ends of the stroke of the air spring device as will be described later. An intermediate portion of the driving wire 8 is wound between sheaves provided in the driving wire 8. The driving wire 8, the hydraulic reciprocating means 10, and the winch 9 constitute a mandrel driving means. Further, 11 is a drawing wire, one end of which is fixed to the upper side of the support member 7, and the other end of which is wound around the drum of a winch 12 installed on the mobile machine base 2. The drawing wire 11 and the winch 12 constitute a mandrel drawing drive means. Further, reference numeral 13 denotes a long belt-shaped paper that is fed into each mandrel 6, and is fed to the sheave 1 at the top of the leader 1 from each of the paper supply drums 14, two of which are installed on the mobile machine stand 2.
5 and 16 into the mandrel 6, and is held at the tip of the mandrel 6.

As shown in FIGS. 5 and 6, the air spring device 10 as the fluid pressure type reciprocating means has a fixed frame 17 fixed on the movable machine base 2 and a movable frame 18 disposed above the fixed frame 17. Serpentine air spring bodies 19, 19 are interposed between these air spring bodies 1.
By alternately supplying and exhausting pressurized air to 9 and 19, these air spring bodies 1
9 and 19 are made to extend and contract with a predetermined stroke, that is, to reciprocate, and sheave 20a,
20b and 21a, 21b are attached.
The driving wire 8 whose one end is fixed to the support member 7 at the upper end of the mandrels 6, 6 passes through the intermediate sheaves 22, 23 provided at the lower end of the leader 1.
20a → 21 in the sheave in this air spring device 10
The wire 8 is wound in the order of a → 20b → 21b, and the other end of the wire 8 is wound around the drum 9a of the winch 9 through another sheave 24. Also,
The drum 9a of this winch 9 can be rotated in the forward and reverse directions, but when driving the mandrel, it is braked so as not to rotate in the opposite direction to the winding direction, and the air spring device 1
When the wire 8 is pulled by a predetermined amount by one reciprocating motion of 0 and becomes slack, the slack is detected by an appropriate sensor, and the wire 8 is rotated in the winding direction by the amount of tension, and the wire 8 is wound up. When the mandrel is pulled out, it can freely rotate in the opposite direction (rewinding direction). Therefore, by continuously operating the air spring device 10, the driving wire 8 is pulled by a predetermined amount and is wound up by the winch 9, whereby the mandrels 6, 6 are successively driven into the ground. It is becoming more and more. Note that 25 in FIGS. 1 and 2 is an intermediate sheave around which the drawing wire 11 is wound.

Next, a paper drain construction method using the above-described paper drain construction device will be explained.

First, as shown in FIGS. 1 and 2, the mandrels 6, 6 are held so that their lower ends are in contact with the ground, and the air spring device 10 is activated while loosening the extraction wire 11. The driving wire 8 is pulled by a predetermined amount by an extension operation, and the mandrels 6, 6 are driven into the ground by an amount corresponding to the amount of tension, and the driving wire 8 is pulled by the contraction operation of the air spring device 10. The winch 9 is used to wind up the slackened portion. This series of steps is continuously repeated a required number of times to drive the mandrels 6, 6 into the ground to a predetermined depth. Fourth
The figure shows the mandrels 6, 6 being driven to a certain depth by the method described above. During this driving, each mandrel 6 slides inside the guide tube 3 fixed to the leader 1. In this case, the telescopic movement of the air spring device 10 and the winding action of the winch 9 allow for rapid downward movement, albeit intermittently. In this way, the mandrel 6,6
is driven to a predetermined depth, the air spring device 10
operation is stopped, the winch 9 on the driving wire 8 side is freed from reverse rotation, and the winch 12 on the pulling wire 11 side is activated to start pulling out the mandrels 6, 6. When the mandrels 6, 6 start to be pulled out, the tip of the paper 13, which had been locked to the lower end of each mandrel 6, comes off and is held by the earth and sand, and as the mandrels 6, 6 rise, the ground In other words, it is left inside and becomes embedded.

In the embodiment described above, an air spring device (hydraulic reciprocating means) is used as the mandrel driving means.
Although a device consisting of a winch and a driving wire was adopted, an exciter may be used as the driving means. Further, although this embodiment uses a double-barrel paper drain device consisting of a pair of left and right mandrels, the present invention can also be practiced using one mandrel or three or more mandrels.

(Effects of the Invention) According to the present invention, since the mandrel is supported and guided by the guide tube fixed to the leader, there is little risk of buckling even if a relatively thin-walled mandrel is used. An inexpensive mandrel can be used. In addition, since the guide pipe plays the role of a windbreak pipe, there is no need to install a windbreak pipe like in the past, and the height of the leader can therefore be kept to the minimum necessary height, thereby reducing equipment costs. can be made cheaper.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially sectional side view of a paper drain construction device, and FIG.
The figure is a front view of the same as above, Figure 3 is an enlarged cross-sectional view taken along the - line in Figure 2, Figure 4 is a front view similar to Figure 2 showing the state in which the mandrel has been driven down to a certain extent, and Figure 5 is a front view similar to Figure 2. 6 is a front view showing the air spring device, and FIG. 6 is a sectional view taken along the line -- in FIG. 5. 1... Leader, 3... Guide tube, 5... Opening groove, 6
... Mandrel, 7... Support member, 8... Driving wire, 9... Winch, 10... Air spring device (hydraulic reciprocating means), 11... Pulling wire, 12...
Winch, 13...Paper.

Claims (1)

[Claims] 1. A guide tube provided with an opening groove along its entire length is fixed to a leader, a paper insertion mandrel is inserted into this guide tube, and a support member attached to the upper end of the mandrel is inserted into the opening groove. A paper drain construction device in which a mandrel driving means and a pulling driving means are connected to the support member, which protrudes from the guide pipe.