JP2003097183A - Pipe jacking device of double tube excavation advancing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe jacking device of a double tube excavation advancing method capable of surely serving for cave-in of a road by surely controlling a diversion quantity of excavating sediment according to soil. SOLUTION: A balloon member 200 is installed on a sediment diversion passage inner wall surface of a casing rod 120, fluid is supplied to the balloon member by a fluid supply passage 220, and an inflating dimension of the balloon member is controlled by fluid pressure to form a shape of almost running along the inner wall surface of the casing rod at contraction time. The balloon member is preferably manufactured by using high strength rubber free from damages by sediment taken into a diversion passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe propulsion device of a double pipe cutting type, and more particularly to a device which can surely limit the amount of excavated sediment depending on the soil quality.

[0002]

2. Description of the Related Art In the construction of water and sewerage systems, water and sewer pipes are laid underground. Recently, in tourist spots, residential areas, etc., pipes for arranging cables are laid underground to protect the landscape.

When laying water and sewer pipes and other pipes in the ground, an excavation method was used in which the ground was excavated and pipes were laid and the excavated earth and sand were backfilled. However, after excavating the road and backfilling it,
Since it is necessary to re-pave and dust and noise become a problem, a pipe propulsion method for propelling and laying pipes underground has recently been adopted.

Although various methods are known for the above-mentioned tube propulsion method, the double tube cutting method is often adopted when laying a small diameter tube. The pipe propulsion device used in this double pipe cutting method basically consists of a slide base, a propulsion device main body, a propulsion jack, a casing rod (inner pipe) and a propulsion pipe (steel pipe), and the slide base has a propulsion device main body. Is mounted slidably and a propulsion jack is provided, and the propulsion jack advances the main body of the propulsion device.

The base of the propulsion pipe is fitted in the pusher of the propulsion device body, and the casing rod is rotatably incorporated in the propulsion pipe. A cutting bit is provided at the tip of the casing rod, a spiral strip steel for earth removal is attached to the inner wall surface of the earth and sand intake passage of the casing rod, and the base of the casing rod is attached to the spindle rod of the propulsion machine body. The casing rod is driven by the drive motor to rotate, and the cutting bit excavates forward, and the excavated earth and sand is taken into the earth and sand intake passage of the casing rod and is discharged to the rear by the action of the spiral strip steel. ing.

When the propulsion of the propulsion pipe is completed, the casing rod is pulled out, a vinyl chloride pipe or the like is set in the propulsion pipe, and a filling agent or the like is inserted between the propulsion pipe and the vinyl chloride pipe or the like to perform double work. Structure pipes can be laid.

[0007] The above-mentioned double pipe cutting method has a wide range of soil properties that can be applied from ordinary soil to cobblestone, boulder-mixed soil, and bedrock, and can directly reach existing manholes or existing shield tunnels. Since it has a double pipe structure, it has features such as no leakage.

[0008]

However, in the conventional pipe propulsion device described above, when the propulsion work is performed in a place where the soil quality is weak, such as sandy ground, the sediment around the propulsion pipe is largely collapsed and taken into the casing rod. However, there was a concern that the road might collapse.

In view of the above points, the present invention provides a pipe propulsion device of a double pipe cutting type in which the amount of excavated earth and sand taken in can be surely controlled according to the soil quality so that the depression of the road can be reliably served. The task is to do.

[0010]

In view of the above, the double-pipe-reduction-type pipe propulsion device according to the present invention drives the propulsion device main body on the slide base forward by the propulsion jack, while
A casing rod having a cutting bit at the tip is rotatably incorporated into the propulsion pipe, the propulsion pipe is attached to the propulsion device body, the casing rod is rotated by the propulsion device body, and the forward sediment is excavated by the cutting bit. In a pipe propulsion device for propelling the propulsion pipe while taking in the excavated earth and sand in the earth and sand intake passage of the casing rod and discharging the soil rearward, it is attached to the inner wall surface of the earth and sand intake passage of the casing rod. ,
A bag-shaped balloon member that expands due to the supply of a fluid and has a different expansion dimension depending on the fluid pressure, and has a shape that substantially follows the inner wall surface of the casing rod when contracted; and a fluid supply passage that supplies the fluid to the balloon member. It is characterized by having.

One of the features of the present invention is that a balloon member is provided in the casing rod, and the balloon member is inflated to control the passage area of the earth and sand intake passage of the casing rod.

[0012] Thus, when performing the propulsion work of the pipe in a soft soil such as sandy place, if the balloon member is inflated to an appropriate size, the amount of sediments taken into the casing rod is limited. Therefore, the sediments around the propulsion pipe will not be greatly collapsed, and the depression of the road surface can be reliably prevented.

Further, when the balloon member is completely deflated, the balloon member is in a form substantially along the inner wall surface of the earth and sand intake passage of the casing rod, so that the balloon member does not become a resistance to take in the earth and sand, and It is possible to secure the amount of sediment that is required for the promotion work of.

The size of the balloon member when inflated is arbitrary, but the balloon member is fully expanded when the balloon member is fully inflated so that the intake of sediment can be completely shut off when necessary. Is preferably configured to be closed.

The balloon member may be provided at any position in the longitudinal direction of the earth and sand intake passage of the casing rod. However, if it is provided at the rear portion of the casing rod, a large amount of earth and sand is generated even if the balloon member is inflated to limit the intake amount. It is preferable to install it on the tip end side of the earth and sand intake passage because the wastes are accumulated in the earth and sand intake passage and the post-work such as cleaning after the propulsion work becomes complicated.

The balloon member may be in the shape of a bag, and its material is not particularly limited as long as it can be inflated by the supply of fluid, and for example, rubber can be used. But,
The earth and sand taken in contain sharp rocks, and if the balloon member ruptures due to this, it becomes impossible to exert the effect of controlling the amount of earth and sand taken in, so a material of high strength may be used.

That is, the balloon member is preferably made of high-strength rubber which is not damaged by the earth and sand taken into the earth and sand intake passage. In order to further improve the reliability of the balloon member, the outer surface or the inner surface of the rubber should be covered with a reinforcing sheet that does not hinder the expansion of the rubber, such as a cloth sheet or a resin sheet, or a resin sheet reinforced with fibers. You may

Here, the earth and sand are meant to include not only soil that can be applied with the double pipe cutting method, ie, ordinary soil, but also boulders, boulder-mixed soil, and bedrock. Further, the fluid supplied to the balloon member may be any material as long as it can be supplied to the balloon member and can expand the balloon member, for example, oil or the like can be used, but it is easy to handle, such as air or water. It is better to use.

The method of attaching the balloon member to the casing rod is not particularly limited as long as it does not hinder the inflation and deflation of the balloon member. However, in order to securely fix the balloon member and to smoothly inflate and deflate the balloon member, the balloon member is fixed to the inner wall surface of the casing rod. It is better to attach them to the opposite parts of.

The fluid supply passage may be of any type as long as it can supply the fluid to the balloon member. For example, a pipe, a hose or a tube can be fixed to the inner surface of the casing rod. However, in consideration of the rotating operation of the casing rod, it is necessary to devise a joint on the base side of a pipe, a hose or a tube and a fluid supply method. Further, in the known pipe propulsion device of this kind, water is pressurized and supplied between the propulsion pipe and the casing rod to be ejected from the rear of the tip pit to prevent the casing rod from being blocked by cutting earth and sand. However, water can be supplied to the balloon member by utilizing the water supply structure on the main body side of the propulsion device.

The slide base, the propulsion unit main body, the propulsion jack, and the propulsion pipe are the same as those of the conventionally known pipe propulsion device.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to specific examples shown in the drawings. 1 to 4 show a preferred embodiment of a double-pipe cutting type pipe propulsion device according to the present invention. In the pipe propulsion device 10, the slide base 100
A propulsion device main body 110 is slidably mounted on the upper part of the slide base 100, and the propulsion device main body 110 is driven forward on the slide base 100 by a propulsion jack 150 and is retracted.

Further, the drive motor 1 is installed in the propulsion unit main body 110.
11, a spindle rod (not shown) is provided, and the spindle rod and the drive motor 11
A gear transmission mechanism is provided between the main body 121 and the main body 121 of the casing rod 120, and the base portion of the main body 121 of the casing rod 120 is attached to the spindle rod.

Further, the pusher 112 is attached to the propulsion unit main body 110.
Is attached, and the base of the propulsion tube 130 is fitted into the pusher 112. A casing rod 120 is incorporated in the propulsion tube 130, and a roller bearing (not shown) extending in the circumferential direction is interposed between the casing rod 120 and the casing rod 120 to ensure smooth rotation and straightness of the casing rod 120. Has become.

The casing rod 120 is constructed by attaching a pipe-shaped front conductor 122 to the tip of the main body 121, and the inside of the casing rod 120 serves as a passage for taking in earth and sand. Further, a cutting bit 140 is provided at the tip of the leading conductor 122.
Is attached, a plurality of cutting blades 141 are attached to the tip surface of the cutting bit 140 at a predetermined equal angular interval in the circumferential direction, and a strip steel 123 is spirally formed on the inner wall surface of the main body 121 of the casing rod 120. Installed on.

Further, a balloon member 200 is inserted into the front conductor 122 of the casing rod 120, and the balloon member 200 is attached to the inner wall surface of the front conductor 122 (the inner wall surface of the earth and sand intake passage) so as to face each other in a strip shape. Board 210
Is fixed by.

For example, locking bands are provided on the outer surface of the balloon member 200 so as to extend in the longitudinal direction or be spaced at intervals in the longitudinal direction, and both ends of the locking band are fixed to the balloon member 200. Alternatively, the mounting plate 210 may be inserted between the member 200 and the mounting plate 210, and the mounting plate 210 may be fixed to the inner wall surface of the front conductor 122 by boiling a screw or the like. Of course, the balloon member 120 can be attached by other methods. For example, the balloon member 200 is attached to the two attachment plates 2
Alternatively, the two mounting plates 210 may be sandwiched by 10 and fixed to the inner wall surface of the front conductor 122 by cooking with a screw or the like.

The balloon member 200 is formed in a bag shape using high-strength rubber, and the outer surface thereof may be covered with a reinforcing sheet, for example, a cloth sheet, a resin sheet, or a fiber-reinforced resin sheet, if necessary. it can.

The balloon member 200 can be freely expanded and contracted by the supply of water, and when fully expanded, the casing rod 12 is expanded as shown in FIG. 4 (c).
While the inside of the 0 front conductor 122 can be closed,
When it is completely contracted, as shown in FIG. 4 (a), it has a form substantially along the inner wall surface of the front conductor 122.

Further, a water supply pipe (fluid supply passage) 220 is attached to the inner wall surface of the casing rod 120 so as to extend in the longitudinal direction, the front end of the water supply pipe 220 is connected to the balloon member 120, and the rear end side has a joint. It is provided so that it can be detachably connected to a water supply pump (not shown) via the propulsion device main body 110, and when the connection is removed, the rear end of the water supply pipe 220 is fully closed.

For example, when laying a pipe in the ground, the starting shaft and the reaching shaft are excavated as usual, and the propulsion unit main body 110 and the slide base 100 are installed in the starting vertical shaft. The base of the propulsion pipe 130 is attached to the pusher, the casing rod 120 is incorporated in the propulsion pipe 130, the base of the casing rod 120 is attached to the spindle rod, and the drive motor 111 is driven to rotate the casing rod 120 and the propulsion jack 150.
When the propulsion unit body 110 is driven forward with, the cutting bit 14
0 excavates the front sediment, the excavated sediment is taken into the sediment intake passage of the casing rod 120, is sent backward by the spiral band steel and is discharged, thus propelling the propulsion pipe 130. it can.

When there is a distance between the starting shaft and the reaching shaft, the propulsion device main body 110 is retracted leaving the casing rod 120 and the propulsion pipe 130, and the casing rod 120
The main body 121 and the propulsion pipe 130 subsequent to the main body 11
Set to 0 and continue propulsion in the same way.

After the propulsion of the propulsion pipe 130, the casing rod 120 is removed from the propulsion pipe 130, the slide base 100 and the propulsion device main body 110 are pulled up from the starting shaft, and a vinyl chloride pipe or the like is inserted into the remaining propulsion pipe 130. However, the pipe can be laid in the ground if the filling work is performed.

At this time, when the ground is soft, the propulsion pipe 13
The earth and sand around 0 collapsed and the case sync rod 120
It will be taken in and there is a concern that the road will collapse.
However, in the case of the apparatus of this example, when the ground is very soft, water is supplied to the balloon member 200 before the start of the pipe propulsion work, and the balloon member 200 is sized according to the softness of the ground, for example, as shown in FIG. When the balloon member 200 is inflated by inflating it to the size shown in FIG. 4 (b) and removing the joint.

Then, since the passage area of the front conductor 122 of the casing rod 120 is almost halved by the balloon member 200, the earth and sand in front of the cutting bit 140 is not taken in unnecessarily, and the earth and sand around the propulsion pipe 130 is large. It does not collapse and there is no risk of road collapse.

The size of the balloon member 200 may be appropriately changed before or during the propulsion work in accordance with the softness of the ground, so that the intake amount of earth and sand can be appropriately controlled.

Further, when the balloon member 200 is completely deflated, the balloon member 200 becomes a shape substantially along the inner wall surface of the front conductor 122. Therefore, even when it is necessary to take in a large amount of earth and sand. Will not be a resistance to uptake.

Further, since the balloon member 200 is made of high-strength rubber, the balloon member 200 is not damaged and ruptured by the rocks having a sharp angle contained in the earth and sand, and the propulsion work can be smoothly advanced. You can

[Brief description of drawings]

FIG. 1 is a schematic side view showing a preferred embodiment of a pipe propulsion device of a double pipe cutting type according to the present invention.

FIG. 2 is a partially cutaway perspective view showing a main part in the embodiment.

FIG. 3 is an overall schematic perspective view showing the embodiment.

FIG. 4 is a diagram schematically showing the movement of the balloon member in the above embodiment.

[Explanation of symbols]

100 slide base 110 propulsion unit body 120 casing rod 121 Casing rod body 122 Lead conductor 130 propulsion tube 140 cutting bits 141 cutting blade 200 balloon member 210 Mounting plate 220 Water supply pipe (fluid supply passage)

Claims (6)

[Claims] 1. A propulsion device main body on a slide base is driven forward by a propulsion jack, while a casing rod having a cutting bit at its tip is rotatably incorporated into the propulsion pipe, the propulsion pipe is attached to the propulsion device main body, and the casing is also provided. Rotate the rod by the propulsion unit body,
In the pipe propulsion device, which is configured to excavate the front sediment by the cutting bit, take the excavated sediment into the sediment intake passage of the casing rod, and discharge the soil rearward while propelling the propulsion pipe, wherein the casing A bag-shaped balloon member which is attached to the inner wall surface of the earth and sand intake passage of the rod, expands due to the supply of a fluid, and has a different expansion dimension depending on the fluid pressure, and has a shape that substantially conforms to the inner wall surface of the casing rod when contracted; And a fluid supply passage for supplying fluid to a member. 2. The double-pipe cutting type pipe propulsion device according to claim 1, wherein the balloon member closes the earth and sand intake passage of the casing rod when the balloon member is fully expanded. 3. The balloon member is provided on the casing front end side of the earth and sand intake passage.
The double-pipe cutting type pipe propulsion device described. 4. The double pipe cutting method according to claim 1, wherein the balloon member is made of high-strength rubber that is not damaged by earth and sand taken into the intake passage. Pipe propulsion device. 5. The double-pipe cutting type pipe propulsion device according to claim 1, wherein the fluid supplied to the balloon member is air or water. 6. The double-pipe cutting-type pipe propulsion device according to claim 1, wherein the balloon members are attached to opposite portions of the inner wall surface of the casing rod.