JPH05141184A - Propulsive embedding equipment for pipe - Google Patents

Abstract

PURPOSE:To enable a small diameter pipe to be embedded even in a hard ground so accurately and efficiently. CONSTITUTION:A foremost drill pipe 20 is provided with a center side shear blade 28 and a peripheral side shear blade 29 rotating in reverse with each other at its tip part in a concentric state. The center side shear blade 18 is made up into a convex spherical curved form, having a lot of drill tips on the surface. The peripheral side shear blade 29 is of cylindrical form, having each tip 12 on the tip part and an inner diametral surface being opposed to the center side shear blade 28. An intermediate drill pipe 30 consists of a pipe body 31 provided with two jack devices 33 in the inner diametral surface and a correction plate 34 interposing between this pipe body 31 and the foremost drill pipe 20. These jack devices 33 are connected even to the correction plate 34 in advance, thus this plate 34 is rocked in time of its expansion. A final drill pipe 40 has a detecting means, detecting a variation in the drilling direction, inside. Those of foremost drill pipe 20, intermediate drill pipe 30 and final drill pipe 40 are connected with one another in series and attached to the tip part of a pilot pipe 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion and embedding device for pipes, and more specifically, it embeds pipes for water supply, sewerage, communication, or power cables in the ground such as roads, tracks, dikes, rivers, etc. The present invention relates to a propulsion and burying device for pipes used when performing.

[0002]

2. Description of the Related Art When burying a small-diameter pipe for water supply, sewerage, communication or electric power cable in the ground such as a road, a track, a bank, a river, etc., a propulsion burying method is adopted. Pushing propulsion method and traction propulsion method are generally used as the propulsion burying method for small diameter pipes, but the push propulsion method is less efficient than the traction propulsion method, and the buried pipe is a vinyl chloride pipe or a fume pipe. In some cases, there is a problem that the pushing direction of the buried pipe is not constant and meanders. For this reason, the traction propulsion system is currently used as a prize.

The present state of the traction type propulsion burying method for the small diameter pipe will be described with reference to FIGS. 8 (a) and 8 (b). First, FIG.
As shown in (a), a starting shaft (1) and a working shaft (2) for work are excavated at both ends of the pipe burying section. Subsequently, a pilot head (3) and a predetermined number of pilot pipes (4) sequentially connected to the pilot head (3) from the starting shaft (1) toward the reaching shaft (2) are installed in the starting shaft (1). The installed hydraulic jack (5) is used to push and propel it one after another in a bug-like manner. At this time, the pilot head (3) compacts and removes the soil (8) in the conduit buried path, and facilitates the propulsion of the pilot pipe (4).

Then, when the tip of the pilot pipe (4) located at the head reaches the inside of the reaching shaft (2), as shown in FIG. 8 (b), from the tip of the pilot pipe (4) to the pilot head (3). ) Is removed, the expansion head (6) and the embedded pipe (7) are attached to the tip of the pilot pipe (4), and the expansion head (6) and the embedded pipe (7) are connected to the pilot jack (4) through the hydraulic jack. Tow by (5). As a result, the earth and sand (8) in the pipe burying path are pressed against the outer periphery of the burying pipe (7) in a compacted state as the expansion head (6) advances. The expansion head (6) is one of the buried pipes (7)
When moving forward by this amount, 2 at the rear end of the earliest buried pipe (7).
The front end of the second buried pipe (7) is connected, and the pulling operation by the reverse activation of the hydraulic jack (5) is restarted. At this time, one pilot pipe (4) protruding into the starting stand (1) is also removed. Until the tip of the buried pipe (7) located at the top reaches the starting shaft (1), the above-mentioned sequential connection and traction propulsion operation and the sequential removal operation of the pilot pipe (4) are performed for a predetermined number of buried pipes (7). Repeat. First buried pipe (7)
When the tip of the embedded pipe (7) is exposed from the side wall surface of the starting shaft (1), the last pilot pipe (4) and the expansion head (6) are removed from the tip of the buried pipe (7). In this way, a plurality of buried pipes (7) are provided between the starting shaft (1) and the reaching shaft (2).
A conduit (9) consisting of is formed.

[0005]

By the way, in the conventional traction propulsion method, the pilot pipe (4) is pushed and propelled while the soil (8) in the pipe burying route is compacted by the pilot head (3). A large compressive load is applied to the pilot head (3) as a consolidation resistance. Therefore, there is no problem when propulsion embedding a relatively small diameter pilot pipe (4) in a soft formation, but when applying the traction propulsion method to hard ground such as gravel layer and rock layer, the pilot head Since (3) does not have the active excavation function and the soil removal function, the consolidation resistance acting on the pilot head (3) increases, and the problems such as the bending of the pilot pipe (4) and the lowering of propulsion efficiency occur. Occur. And pilot pipe (4)
The buried pipe (7) meanders when towing.

[0006] Therefore, an object of the present invention is to provide a propulsion and embedding device for a pipe, by which the pilot pipe can be buried in the soil accurately and efficiently.

[0007]

In order to achieve the above object, the device of the present invention comprises a head drill pipe, an intermediate drill pipe, and a final drill pipe, which are connected in series.
The tip has a center-side shear blade and an outer-peripheral-side shear blade that rotate in opposite directions to each other in a concentric state, and the center-side shear blade has a convex spherical curved surface shape arranged on the axis of the leading drill pipe and has a surface. In the above, the outer peripheral side shear blade is a cylindrical one that accommodates the center side shear blade therein, and at least a portion facing the center side shear blade of the annular portion and the inner diameter surface of the tip. Has a drilling tip on

The intermediate excavation pipe is interposed between a pipe body having a jack device mounted on the inner diameter surface thereof, and the pipe body and the leading excavation pipe, and the rear end face of the leading excavation pipe is connected to the leading excavation pipe. The correction plate is configured to be connected to the jack device and swing with respect to the tubular body as the jack device expands and contracts.

The final excavation pipe is internally provided with detection means for detecting a change in the excavation direction.

[0010]

The object to be excavated, such as rock, is excavated and crushed by the excavating function of the center-side shear blade and the outer-side shear blade and the shearing force generated by the reverse rotation of both shear blades. The crushed bedrock, etc., has a drilling tip attached to the center-side shear blade forming a convex spherical curved surface shape,
It is further finely crushed in cooperation with a drilling tip located at least in a portion of the inner diameter surface of the cylindrical outer peripheral side shear blade facing the central side shear blade. During excavation work, if the excavation direction deviates from the predetermined direction, the deviation is detected by the detection means in the final excavation pipe and transmitted to the operator. The operator appropriately expands and contracts the jack device in the intermediate excavation pipe to correct this deviation, and swings the correction plate connected to the jack device. The swing of the correction plate changes the posture of the leading excavation pipe that is in close contact with the correction plate and changes the excavation direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the present invention will be described below with reference to FIGS.

A pipe propulsion and embedding device according to the present invention is shown in FIG.
As shown in Figure 1, the top drill pipe (20) and the intermediate drill pipe (30)
And the final drill pipe (40) are connected in series.

The head excavation pipe (20) is provided as an excavation means for hard ground such as gravel layer, rock layer, or hard clay layer, and its configuration will be described below with reference to FIG.

A drive source, for example, a hydraulic motor (22) is built in the fixed tube body (21).
Pinion (22B) fixed to the power shaft (22A) of 2)
Is engaged with the sun gear (25) fixed to the base end of the shear blade mounting shaft (24) which is rotatably supported by the shaft center of the tubular body (21) via the bearing (23A). Further, the sun gear (25) is a rotary pipe rotatably supported by bearings (23B) and (23C) at the front end of the fixed pipe body (21) via the planetary gear (25A) shown in FIG. By engaging with an internal gear (27) formed on the inner peripheral surface of the body (26), the center side shear blade (28) fixed to the front end of the shear blade mounting shaft (24) with a bolt (24A). ) And the outer peripheral side shear blade (29) fixed to the front end of the rotary tube body (26) with a bolt (26A) to form a power transmission device for rotational driving.

By utilizing the above planetary gear mechanism,
The central shear blade (28) and the outer peripheral shear blade (29) rotate in opposite directions when the hydraulic motor (22) is started. As a result, the object to be excavated, such as bedrock, is further finely crushed by the shearing force acting between the shearing blades (28, 29) in addition to the excavating function of the shearing blades (28) (29).

As shown in FIG. 4, the center side shearing blade (28) is provided with a suitable means such as screwing, press fitting, or shrink fitting on the surface of the tip mounting structure (11) formed in a substantially convex spherical curved surface. A large number of drilling chips (12) at a predetermined pitch using
(12) ····································································· To do. The convex spherical curved surface does not mean only a perfect spherical curved surface, but also includes a combination of a plurality of flat surfaces as shown in the drawing to approximate a spherical curved surface.

On the other hand, the outer peripheral side shear blade (29) has an annular drilling tip (1) over the entire circumference of the tip of the cylindrical pedestal (14).
6) (16) ..., and a large number of drilling tips (15), (15), ... on the inner surface of the pedestal (14) facing the central shear blade (28). Constitute. As the means for attaching the drilling tips (15) (16), screwing, press fitting, shrink fitting, or the like can be used as in the drilling tip (12) of the center side shear blade (28).

As described above, the center side shear blade (28) is formed into a substantially convex spherical curved surface shape, while the outer peripheral side shear blade (29) has an inner diameter surface and an excavating tip () at the portion facing the center side shear blade (28). By installing 15), the excavated rock mass etc. rotate in opposite directions as they move to the right in the drawing.
2) By the cooperation of (15), it is crushed even more finely. Therefore, it is unlikely that the rock bed or the like will be caught between the center side shear blade (28) and the outer side shear blade (29) to make it difficult to continue excavation. Further, since the center side shear blade (28) is arranged so as to be retracted by the distance (L) from the tip end portion of the outer peripheral side shear blade (29), the above-mentioned action is further effectively performed.

Further, the drilling tips (12) (15) (16)
Has a structure that can be attached to and detached from the center-side shear blade (28) and the outer-side shear blade (29), which facilitates the replacement of the tip after a predetermined period of use, and bites rocks, etc. It is also possible to partially repair each chip (12) (15) (16) when it is damaged due to the inclusion. Further, as shown in FIG. 1, the center side shear blade (28) has a shear blade mounting shaft (24).
Since it is fixed by a through bolt (24A) to the front end of the, it can be replaced according to the soil quality of the ground to be excavated. Since the outer peripheral side shear blade (29) is also fixed to the front end of the rotary tube body (26) with a bolt (26A), the central side shear blade (28)
Or it can be replaced in response to changes in the soil quality of the ground to be excavated.

A high-pressure water jetting device (not shown) including a water supply hose and a jetting nozzle is arranged in the head excavation pipe (20). Using this injection device, the center side shear blade (2
By injecting high-pressure water to the excavated portion by the 8) and the outer peripheral side shear blade (29), the excavation action of both the shear blades (28) (29) is strengthened and the soil is smoothly discharged.

Further, in the head excavation pipe (20), a head portion of an auger type earth discharging device is arranged. This earthmoving device uses a hydraulic motor (not shown) arranged in the start-up shaft (1) as a drive source, and uses each pilot pipe (4), final drill pipe (40), intermediate drill pipe (30) and An earth discharging pipe (51) inserted into each of the leading excavation pipes (20) has an earth discharging screw (not shown). By rotating the soil discharging screw by the hydraulic motor, excavated rock or the like is discharged through the soil discharging pipes (51) into the starting stand (1).

The high-pressure water jetting device and the auger type earth-discharging device are the rotary driving force transmitting device including a pinion (22B), a sun gear (25), a planetary gear (25A) and an internal gear (27). Install at a position that does not interfere with

The intermediate drill pipe (30) is the leading drill pipe (2).
It is provided as excavation direction correction means for making the pushing propulsion direction of 0) constant. This intermediate drill pipe (3
As shown in FIGS. 1 and 5, 0) is composed of a pipe body (31) and a correction plate (34) interposed between the pipe body (31) and the head drill pipe (20). ..

A stroke sensor control unit (32) having a built-in hydraulic flow path switching valve is fixedly installed in the pipe body (31), and four hydraulic jack devices (33) are arranged at circumferentially equidistant positions. Arrange. The cylinder portion of the hydraulic jack device (33) is mounted on the inner peripheral wall surface of the pipe body (31) via the bracket (35) and the pin (36), and the tip portion of the piston rod is mounted on the bracket (37) and the pin (38). ) On the inner peripheral wall surface of the correction plate (34). Further, the correction plate (34) has a positioning pin (3
After the front excavation pipe (20) is fitted with the fixing means such as bolts while 9) is fitted in the hole (39A) [see FIG. 2] formed in the rear plate of the front excavation pipe (20). Tightly connect to the end.

With the above structure, when the oil passage of the stroke sensor control unit (32) is switched to selectively operate the four hydraulic jack devices (33), the correction plate (34)
Oscillates in various directions as indicated by the chain double-dashed line. As a result, the posture of the leading excavation pipe (20) in close contact with the correction plate (34) changes, and the excavation direction changes.

The final excavation pipe (40) has a detection means inside for detecting a change in the excavation direction due to a change in soil quality or the like. As shown in FIG. 6 and FIG. 7, a plate-shaped collimation target (42) equipped with a light-emitting body, for example, an LED, is fixed to the front end of the tubular body (41) by using positioning adjusting means such as a positioning pin (46) Along with the arrangement, a projection path (43) for a laser beam emitted from a projector (not shown) for the laser beam provided inside the starting stand (1) is formed inside the tube body (41). The projection path (43) is also continuously formed in the pilot pipe (4). The front end plate (44) of the pipe body (41) is integrally joined and fixed to the rear end of the intermediate excavation pipe (30) by using a fixing means such as a positioning pin (not shown) and a tightening bolt. The outer diameter of the tubular body (41) is designed to be substantially equal to the outer diameter of the tubular bodies (21) and (31).

The propulsion direction detecting mechanism proposed by the present applicant in Japanese Patent Application No. 3-275129 can also be applied as such an excavation direction detecting means. That is, the projection path (4
In 3), two targets having a large number of luminous bodies are arranged apart from each other, and an image pickup means such as a theodolite is arranged in the starting shaft (1). Then, the light emitting bodies mounted on both targets have different arrangement modes and different emission colors for each target. In such a configuration, the position of the light emitters attached to both targets is recognized by the image pickup means, and the change in the excavation direction that occurs during excavation is detected by the displacement between the light emitters.

In FIG. 7, reference numeral (47) is the head drill pipe (20).
The insertion hole of the hose for supplying water to the high-pressure water injection device provided inside is displayed, and (48) supplies hydraulic oil to the hydraulic motor (22) provided inside the head drill pipe (20). Display the insertion hole for the hose. Reference numeral (49) is an insertion hole for an electric wire for supplying electric power to the stroke sensor control unit (32).

A method of operating the propulsion and burying device for a pipe having the above-mentioned structure will be described below.

First, the start-up resistance (1) is set at both ends of the pipe burying section.
And excavating the reaching shaft (2), and at a suitable position in or near the starting shaft (1), a hydraulic jack (5), an excavation control panel, an excavation direction control panel, a pump for supplying high-pressure water, a laser. Install a light beam projection device, hydraulic motor for driving the auger type soil discharge device (50), etc. As the buried pipe (7), for example, a vinyl chloride pipe with an outer diameter of 200 mm is prepared, and correspondingly, a leading drill pipe (20) with an outer diameter of about 250 mm, an intermediate drill pipe (30) with an outer diameter of about 241 mm, and A propulsion burying device consisting of a structure for sequentially joining the final drill pipe (40) is prepared. On the other hand, as a pilot pipe (4) to be connected to the rear end of this propulsion and burying device, a steel pipe with an outer diameter of about 240 mm having connection structures at both ends is prepared. Considering that the ground to be excavated is a hard gravel layer or rock layer, the outer diameter of the outer peripheral shear blade (29) is set to 260 mm, and the specifications of the hydraulic motor (22) and high pressure are correspondingly set. Select the water injection pressure. For example, the specifications of the hydraulic motor (22) include a rotation speed of 28 rpm, a normal operating pressure of 80 kgf / cm ² , an instantaneous maximum pressure of 115 kgf / cm ² , a normal output torque of 45 kgf ・ m, an instantaneous maximum output torque of 65 kgf ・ m, and a required oil amount of 9.5. In addition to selecting l / min, as the specifications of the outer peripheral side shear blade (29), a rotational torque of 190 kgf ・ m and a rotational speed of 6.5 rpm were selected, and as the specifications of the center side shear blade (28), a rotational torque of 45 kgf.・ M, rotation speed
Select 28 rpm. The pressure of high pressure water is set to 45 kgf / cm ² .

After the above-mentioned preparation work is completed, the hydraulic jack (5) provided in the starting stand (1) is activated to start the leading excavation pipe (20), the intermediate excavation pipe (30), and the final excavation pipe (40). And a plurality of pilot pipes (4) sequentially connected to the rear end of the propulsion embedding device obtained by joining the parts to each other are pushed toward the reaching pit (2) and propelled. During this pushing propulsion, the hydraulic motor (22) is activated to rotate the center side shear blade (28) and the outer side shear blade (29) in opposite directions via the planetary gear mechanism, and The rock on the pipe burial route is finely shredded to an average particle size of about 10 mm. Rock shattered by shearing together with jetted water, auger type earth removal device (50)
Thus, the soil is discharged into the starting stand (1) through the soil discharge pipe (51).

During the above-mentioned pushing propulsion, the final excavation pipe (40) from the laser beam projection device installed on the side of the starting stand (1).
A laser beam is projected toward the collimation target (42) mounted inside. When the action direction of the excavation load changes due to conditions such as rock mass on the excavation route, the projection position of the laser beam on the collimation target (42) shifts, and the resulting change in the light amount is mounted in the intermediate drill pipe (30). The stroke sensor control unit (32) is read as a change in the input signal. Based on the output signal sent from the stroke sensor control unit (32), the operator individually changes the stroke of the piston rod of each hydraulic jack device (33) on the starting shaft (1) side, and the correction plate (34). Is oscillated to correct the excavation direction. As a result, the propulsion direction of the leading excavation pipe (20) is automatically corrected, and the pilot pipe (4) connected to the rear end of the propulsion burying device is given a linear forward pushing posture.

Under the control of the forward pushing posture, the propulsion embedding device and the pilot pipe (4) sequentially connected to the rear end thereof are pushed and propelled toward the reaching thrust (2), whereby the starting thrust (1) And the reaching shaft (2) are linearly connected by a plurality of pilot pipes (4).

After that, the leading drilling pipe (20), the intermediate drilling pipe (30) and the final drilling pipe (40) are removed from the tip of the pilot pipe (4) in the reaching shaft (2), and further, for driving. A part of the auger type earth removing device (50) including the hydraulic motor is removed on the side of the starting stand (1). Then, the first buried pipe, for example, a vinyl chloride pipe (7) with an outer diameter of 200 mm, is connected to the tip of the earliest pilot pipe (4) using a connecting means such as screwing, and the pilot pipe (4) is provided on the starting stand (1). The hydraulic jack (5) is reversely activated to start the traction and propulsion of the buried pipe (7) by the pilot pipe (4). After that, the connecting operation and the pulling propulsion operation by the hydraulic jacks (5) are repeated for the plurality of embedded pipes (7) until the front end of the earliest embedded pipe (7) reaches the front wall of the starting stand (1). .. By this, the ultimate standing (2)
A line consisting of a predetermined number of buried pipes (7) is formed between and the starting stand (1).

[0035]

According to the present invention, since the center-side shear blade and the outer-side shear blade are rotated in opposite directions to each other, the object to be excavated has shearing force acting between the shearing blades in addition to the excavating function of both shearing blades. It is crushed reliably and efficiently by force.

Further, the center-side shear blade is formed into a convex spherical curved surface and is housed in the cylindrical outer-peripheral-side shear blade, and at least the portion of the inner-diameter surface of the outer-side shear blade facing the center-side shear blade is excavated. Since the chips are attached, the crushed rock etc.
It is crushed into smaller pieces as it passes between the two shearing blades. As a result, it is possible to prevent the excavation from becoming impossible due to the fact that the bedrock or the like is caught between the shearing blades, and the excavation work can be continued stably.

Further, the operator who has detected the deviation of the leading excavation pipe in the excavation direction during excavation can easily correct the excavation direction to a predetermined direction by appropriately operating the jack device in the intermediate excavation pipe. ..

From this point of view, according to the device of the present invention, it is possible to efficiently and accurately form a pipeline even in hard ground such as a gravel layer or a rock layer, which was difficult with the conventional device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pipe propulsion and embedding device according to the present invention.

FIG. 2 is a vertical cross-sectional view of a top drill pipe.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a vertical sectional view and a front view of a center side shear blade and an outer peripheral side shear blade.

FIG. 5 is a vertical sectional view of an intermediate drilling pipe.

FIG. 6 is a vertical sectional view of a final excavation pipe.

FIG. 7 is a front view of the final drill pipe viewed from the side of the intermediate drill pipe.

FIG. 8 (a) is a diagram showing a pilot pipe pushed in by a conventional pipe propulsion burying device, and FIG. 8 (b) is a diagram showing a buried pipe pulled in similarly.

[Explanation of symbols]

 4 Pilot Pipe 7 Buried Pipe 12 Drilling Tip 15 Drilling Tip 16 Drilling Tip 20 Leading Drilling Pipe 28 Center Side Shear Blade 29 Outer Side Shear Blade 30 Intermediate Drilling Pipe 31 Tube 33 Jack Device 34 Correction Plate 40 Final Drilling Pipe

Claims (1)

[Claims] 1. A leading digging pipe, an intermediate digging pipe, and a final digging pipe are connected in series, and the leading digging pipe has a center-side shearing blade and an outer-periphery-side shearing blade that rotate in opposite directions at their tips. It is provided in a concentric state, the center side shear blade is a convex spherical curved surface shape arranged on the axis of the leading drill pipe and has a drilling tip on the surface, and the outer peripheral side shear blade is the center side shear blade. A cylindrical shape for accommodating a blade therein, having a drilling tip at least at a portion facing the center side shearing blade of the annular portion at the tip and the inner diameter surface, and the intermediate drilling pipe has a jack device on the inner diameter surface. And a correction plate that is interposed between the pipe body and the head excavation pipe and that is in close contact with the rear end surface of the head excavation pipe when connected to the head excavation pipe,
The correction plate is connected to the jack device so as to swing with respect to the pipe body as the jack device expands and contracts, and the final excavation pipe internally includes a detection means for detecting a change in the excavation direction. A propulsion and burying device for pipes characterized by being.