JPS60208598A - Small diameter tube propulsion device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressurized small diameter pipe propulsion device, and more particularly to a device suitable for propelling and burying small diameter pipes in ground where there is a lot of underground sewage or high groundwater pressure.

Traditionally, for example, the inner diameter! A method of installing a small-diameter pipe of approximately OO% into the ground is to press-fit a small-diameter pipe of a fixed length directly into the ground, excavate and discharge earth and sand using a screw or auger inserted into the pipe, and then press-fit the pipe. Once this was completed, the next small-diameter pipe was added and press-fitted in the same way, and by repeating this process, a predetermined length of small-diameter pipe was buried.

However, according to the above-mentioned conventional method, the inside of the small-diameter pipe that should be buried or is buried is all under atmospheric pressure, and the ground at the face part is likely to collapse, causing accidents under the soil law.
In addition, when a small diameter pipe is used as a document, the subsequent pipes are joined by welding, but if there is water in the pipe, satisfactory welding cannot be performed, and if there is a lot of underground water, screw augers may be used. However, there are disadvantages such as the large amount of soil and water that is discharged, which requires water extraction work to dispose of it.

The present invention was made with the aim of improving the above-mentioned drawbacks, and when a small-diameter pipe is buried in ground with a lot of groundwater or high groundwater pressure, the inside of the small-diameter pipe is
Alternatively, the face is constantly maintained under pressure with compressed air,
Thus, the present invention provides a pneumatic small-diameter propulsion device that is useful for preventing the collapse of earth and sand and the discharge of a large amount of water along with earth and sand.

The drawings showing the embodiment of the device of the present invention will be explained below. In Fig. 1, (1) is a vertical shaft, (2) is a buried ground, and (3) is an earth retaining wall. wall (3
). (4) is a propulsion device for rotating the screw auger (6) inserted into the tube body (5) after press-fitting the tube body (5) into the ground (2); (7) is a propulsion device ( A slide base on which the frame (8) of 4) is movably mounted, the frame (8) having an operating cylinder (9) provided in the slide base (7).
The movable part of the cylinder (9) is fixed, and the propulsion device (4) is moved on the slide base (7) by the operation of the cylinder (9). The frame (8) has front and rear vertical walls αo) (divided by 1υ) spaced apart from each other, and the frame (8) has a vertical wall αo) (into the compartment (b)) which is rotatable and movable back and forth. A hollow shaft (2) penetrates horizontally in the front and back direction, and the hollow shaft (B) is connected to an exterior tube supported between the front and rear vertical walls (11) in the compartment (B) and a key (not shown). Rotation is transmitted to the hollow shaft (b) by rotating a gear wheel (16) fitted through the outer tube and fixed to the outer pipe (b) to the motor via a timing belt or chain (b). It has become so. In addition, a stopper is provided on the chamber (B) side of the hollow shaft, so that the hollow shaft can be rotated while rotating the chamber).
It is designed to be able to slide in the front and back direction between the front and rear walls of the hollow shaft (1) at the rear end of the hollow shaft (1) and a reciprocating cylinder (1) for the hollow shaft (2) by a rotary joint (2) installed at the rear end of the hollow shaft (1) and a reciprocating cylinder (2) for the hollow shaft. Further, the hollow shaft is provided with a swivel joint at the rear end thereof, and is connected to a compressed air source (not shown). pipe) is joined via pulp (goods) from the pipe (
Compressed air is supplied from 2) into the hollow shaft. (Foundation) is a hollow shaft with a transparent closure on the rear end surface.
□It is a blockage.

A rotary feeder (b) is provided in front of the above-mentioned compartment (), and the rotation axis (c) of the rotary feeder
is attached to the outer periphery of the hollow shaft (b) so as to rotate together with the hollow shaft (b), and to allow the back and forth movement of the hollow shaft (b). It is provided on the side, and the discharge port is provided on the rear lower surface side.

ing. The hollow shaft (b) extends forward through the feeder (b) and is connected to the hollow screw auger shaft o1 via an air pinch pulp having an opening/closing handle. The above-mentioned air supply pipe (2) is divided into two limbs via the pulp, and the pipe extending from the pulp is communicated with the feeder interior. ) located at the tip of the ground (
2) is a part of the cutter that performs cutting, and the force and part of the ivy are provided at the tip of the auger shaft o1, and as shown in Figs. opening C
The front plate η is equipped with a front plate η having a diameter of 181-, and the rear plate ▪ is equipped with a fan-shaped opening substantially the same as that of the front plate η, and the front plate is attached to the tip of the O-O shaft 01. Although the rear plate is fixed, the auger shaft 01 is regulated by a groove [411] provided on the outer periphery of the front plate on the back side of the front plate.
It is mounted so that it can rotate around the center. A through hole (in a bit with 4υ) is provided in the center of the front plate η, and a fan-shaped opening liI! of the rear plate is provided. One end edge of the fan-shaped plate part forming JlBl, that is, the edge on the side in the direction of excavation rotation, passes through the opening (to) - and the front plate -
The scrapers protruding further than the front surface of the auger are arranged in a row in the radial direction, and when the auger shaft is rotated in the direction (where the auger shaft performs the excavating action), the scrapers are subjected to the resistance of the earth and sand and are Rear face plate c1 until the edge of the face plate (b) on the rotational direction side) comes into contact with the scraper (b).
9) remains temporarily stationary, and the edge of the front plate (b) -
2) comes into contact with the scraper (goods), so that the rear plate (■) equipped with the scraper @4@4 is rotated together with the front plate (η), and thus the front, A fan-shaped opening (■) in which the opening and the row of the rear plate part (η) overlap appears, and the excavated earth and sand are fed into the pipe body (5) from this opening and opening member, and the screw auger (6)
It is designed to be carried backwards by. Then, when the auger shaft 0D is reversed, the scraper @
4 @ 4 temporarily comes to a standstill due to the resistance of the earth and sand, but the other edge (b) of the front plate @ η comes into close contact with the scraper, and the scraper and the rear plate together with the scraper come into contact with the scraper. While rotating it in the opposite direction, the fan-shaped opening 1 described above is connected to the front plate (3'
6. - indicates the position regulating ring of the rear plate -, ■ indicates the surveying target fixed to the auger shaft C1η, and the ring indicates the transit installed on the vertical pile (1).

The tube body (5) described above is formed by connecting a plurality of short tubes (j-/) (j-J)---(j-n) as schematically shown in FIG. The auger (6) and one auger shaft C are similarly short auger units (4-/) (4-1)---(4-n
) is inserted into the tube body (5). Each auger unit (4-/) (Go-J) --- (Otsu-
An opening @υ for introducing air into the hollow part of the auger shaft Ov is provided at the rear of the auger shaft 0υ of n), and is connected to the pipe stitch extending from the pulp CI through the pulp, Normally the pulp remains closed. In addition, an air pinch pulp located inside the air supply pipe via pulp i (b) is installed at the connecting part of the rearmost auger unit (≦-・n), and the valve is also normally closed. The state is maintained. - in Fig. 1S2 is a power wrench for rotating the tubular body (5) while holding its outer periphery, and controlling its advancement according to the advancement of the tubular body (5).

Next, the operating procedure of the propulsion device configured as described above will be explained. As shown in Fig. 1, the operating cylinder (9) is retracted and the propulsion device (4) is set at the rearmost position. When the motor (at 1 o'clock) is started and the gear wheel (at 1 o'clock, the hollow shaft is rotated through the outer tube), the rotary feeder @η, air pinch pulp, and auger part rotate, and the bit wheel rotates. Then, the shaft 00 of the screw (6) is driven to rotate in the scraper, and the cutter starts excavating the ground (2), and as described above, an opening appears, and the excavated earth and sand are piped through the opening. (5), is sequentially sent rearward by the rotation of the screw auger (6), and is airtightly discharged from the rotary feeder. If a large amount of groundwater is found in this discharged sediment,
The pulp is opened, compressed air from the pipe is supplied into the rotary feeder through the pipe, and the inside of the pipe body (5) is ventilated to pressurize the inside of the pipe body (5). Therefore, the inflow of groundwater from the above-mentioned opening (S) is prevented by air pressure. Thus, the operating cylinder (9) is gradually extended to advance the propulsion device (4), and at the point when the propulsion device (4) approaches the power wrench as shown in FIG. ) is reversed and the auger shaft clυ is rotated in the opposite direction. As mentioned above, the scraper comes to a temporary standstill due to the resistance of the earth and sand, and during that time the front plate cIη rotates in the opposite direction, causing the scraper to move in the opposite direction. the opening) is occluded. Next, when the pulp (goods) is opened, compressed air is sent into the hollow shaft (b) and auger shaft 01) through the pipe (c) and swivel shim ind. Open hole υ
This prevents groundwater from gushing out toward the ground and entering the pipe body (5). Next, close the pulp, loosen the tightening bolts of the propulsion head installed on the outside of the P-Tally Feeder (Incorporated), and release the connection between the propulsion head and the rear end of the tube body (5). When the operating cylinder (9) is retracted, the hollow shaft (B) remains as it is, the propulsion device (4) is retracted at Il, and the propulsion head is released from the rear end of the tube body (5). Leave. This retraction dimension is the range until the stopper (B) of the compartment (B) comes into contact with the front wall of the frame (8).

When a space is formed between the rear end of the tube body (5) and the propulsion head in this way, this space is used to produce pulp c1.
A pipe connects the engine and the pulp, and the pulp CI is opened to force air into the auger shaft Op. Next, when air with a pressure higher than the pressure air supplied in the pipe is supplied from the pipe into the air pinch pulp by opening the pulp 4 of the air pinch pulp, the inside of the pinch pulp is A stretchable resin film (54) stretched around the periphery is expanded to close the hollow passage.

During this time, the excavation section continues to be supplied with compressed air from the pulp tube. Next, close the pulp, remove the Bordeaux connecting the air pinch pulp and the hollow shaft, move the propulsion device (4) further back, and move the existing pipe body (5)
A new unit auger and short pipe are combined and positioned between the unit auger and the propulsion device (4) 7, and the work of connecting the unit auger and the pipe body is started. Although not shown, first connect the front end of the shaft of the new unit auger to the pinch pulp in the existing pipe, and also connect the new pinch pulp that has been installed in advance to the rear end of the new unit auger. ) to the hollow shaft, then open the pulp (goods) and feed compressed air into the hollow shaft (b) through the swivel joint (goods) to pressurize the inside of the shaft of the new auger unit. After the condition is established, remove the air supply hose. When this air supply hose is removed, the resin film shrinks and the hollow shaft (b) communicates with the auger shaft 01, and the pressurized air in the hollow shaft (b) acts on the auger shaft 0η. Subsequently, the pulp door is closed, the pipe OSa is removed, and the rear end face of the existing pipe and the front end face of the new pipe body are joined together, and if the pipe body is a steel pipe, they are welded together. Next, the propulsion device R (4) is moved forward slightly to position the propulsion head at the rear end of the new tube, and the two are airtightly connected with Bordeaux. Thereafter, the pulp is opened and air is pumped into the extended tube (5), while the tube (5) and screw auger (6) are rotated to carry out the next excavation operation.

Note that 1. The purpose of the transit test is to confirm the position of target @1 through a transparent blocking plate and to measure whether the tube (5) is moving along the planned line. In the above embodiment, the hollow part of the auger □ shaft 0υ is directly used as a means for blowing out compressed air from the front of a part of the cutter, but as shown in FIG. 7 and FIG. Even if the shaft is made of a double pipe structure and air is fed into the annular space, and a check valve is used instead of air pinch pulp, the air inlet from the pulp pipe and the ventilation part at the rear thereof can be used. If a closing device is provided, the same effect can be achieved. By employing this double-tube structure, it is possible to prevent the phenomenon of clouding of the cavity at the center of the auger shaft due to compressed air.

As described above, the small diameter pipe propulsion device according to the present invention propels the connecting pipe body (5) into the ground while sequentially connecting the trailing pipe to the leading pipe, and the screw inserted into the connecting pipe body (5). In a device that transports excavated soil backward □ by an auger, a screw auger ( 6) The shaft 0υ of the auger shaft 0υ is made hollow, and a through hole (sha) is provided on the tip surface of the auger shaft 0υ through which the hollow part of the auger shaft Op communicates with the ground, and each tube body (5) is formed. Short □ Suga (j-/) (j-, 2
)---Each auger unit in (j-n) (Otsu-/)
(4-J) --- An opening (5D and Pulp I4 is provided at the rear of each auger shaft of (, 4-n), and the hollow part of the auger shaft can be closed at the rear end of each auger shaft. A rotary shaft is installed in which a suitable pulp is installed, and the interior of the auger shaft (which drives the auger shaft 0η) is connected to a compressed air source by digging a pipe through the pulp. The feeder integral force and the compressed air source are connected by a pipe (goods) through a pulp (goods), and the hollow shaft
'') into the auger shaft Op and from the rotary feeder into the pipe body (5) to pressurize the auger shaft 0υ and the pipe body (5). Therefore, when excavating ground with a lot of groundwater, compressed air is sent into the pipe (5) and the auger shaft eυ to pressurize the inside of both (5) 0υ.・
If excavation is carried out in this condition, the excavation can be carried out smoothly without the soil collapsing. Since excessive inflow of groundwater into the pipe is prevented, welding work for connecting subsequent short pipes can be carried out accurately without any problems, and high-quality work can be carried out. Furthermore, since the soil with low moisture content is discharged through the pipe body, there is no need for water extraction work, and the cost of soil disposal can be reduced, resulting in great effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partial cross-sectional side view of the main part of the device in an excavating state, and FIG. 2 is a part of the propulsion device in a state where it is retracted for connection 6 of the following short pipe. The cross-sectional side view, Figures 3 and q are the front view and cross-section gJ of the leading pipe.
J-side view, J-side view, and J-th side view are front views of the front plate and rear side plate for forming the opening, and FIGS. 7 and 1 are shafts showing other embodiments of the shaft portion of the auger unit. FIG. 2 is a cross-sectional side view and a cross-sectional front view of the section. (5)...tube, (,3;-/)(!-2)-...(
, t-n)...Connection short pipe, (6)...Screw auger, (4-/)(4-,2)--1(4-n)...
・In the auger unit)...Hollow shaft, (Foundation)...Pulp, Vehicle...Pipe, (Foundation)...Rotary feeder, Op...Auger shaft, View...Pulp, (Foundation)
...pipe, (goods)...through hole, ■...opening, 藝υ...opening, -...pulp. Patent applicant Okumura Gumi Co., Ltd.

Claims (1)

[Claims] While sequentially connecting the trailing pipe to the leading pipe, the connecting pipe body is propelled into the ground, and the excavated soil is transported backward by a screw auger inserted into the connecting pipe body, and the ‘following pipe and propulsion device In a device for discharging earth and sand from a rotary feeder installed between a rotary feeder, an opening for earth and sand discharge is opened at the tip of the creauuger when it rotates in the digging/excavation direction, and is closed when it rotates in the opposite direction. -, the shaft 011 of the screw auger (6) is made hollow, and a through hole is provided in the tip surface of the auger shaft 01 through which the hollow part of the auger shaft 0υ communicates with the face ground. (
5) Each short tube (j-/) (j-co)---
Each auger unit in (j-n) (Otsu-/) (4-2
)---(4-n) opening and valve at the rear of each auger shaft! At the same time, an appropriate pulp capable of closing the hollow part of the auger shaft is arranged at the rear end of each auger shaft, and a hollow shaft (internal compression) is provided in the propulsion device that drives the upstream auger shaft eI. Connect the air source with a vibrator (2) through the pulp, and connect the rotary feeder that discharges earth and sand with the compressed air source through the noserp (2) with a pipe. Then, pressurized air is fed into the auger shaft 0'D from the hollow shaft (into the hollow shaft) and into the tube (5) from the two-tary feeder (goods) to the inside of the auger shaft eD and the tube (5). A propulsion device for a small diameter tube, characterized in that the inside thereof can be maintained in a pressurized state.