JP4132456B2 - Propulsion method and lubricant injection method in the propulsion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a propulsion method for excavating a natural ground in order to lay a tunnel or a buried pipe in the ground.
[0002]
[Prior art and its problems]
The conventional method of injecting lubricant in the propulsion method is the friction resistance between the excavation ground and the outer peripheral surface of the propulsion pipe, which is generated when the excavator and the propulsion pipe are sequentially pushed in parallel with the excavation of the natural ground by the propulsion jack. In order to suppress the increase, the local concentrated injection method from the existing lubricant injection port of the propulsion pipe is performed.
[0003]
However, it is difficult to inject evenly around the entire circumference of the propulsion pipe that requires lubricant, and the strength of the propulsion pipe decreases when the number of injection ports is increased to inject the lubricant around the entire circumference. However, there is a problem that cracks and peeling breakage occur, and a lubricant injection device described in Japanese Patent Publication No. 4-23077 is known as a countermeasure.
[0004]
4 and 5, the excavator 21 and the propulsion pipe 22 are connected via a lubricant injection device 23, and the lubricant injection device 23 has substantially the same diameter as the outer diameter of the propulsion tube 22. It is comprised from the ring body 25 and the collar-shaped seal ring 27 provided in the outer peripheral part of the ring body 25. As shown in FIG.
[0005]
The ring body 25 is provided with injection ports 26 of the lubricant at equal intervals over the entire circumference so that the lubricant can be evenly injected over the entire circumference.
[0006]
Further, since the bowl-shaped seal ring 27 disposed in front of the injection port 26 in the traveling direction is always in contact with the excavated ground surface 29, there is an effect that the lubricant does not leak to the excavator 21 side. .
[0007]
However, in the conventional lubricant injection device, the lubricant injection port 26 opens to the outer peripheral side, and there is a problem that earth and sand generated during excavation enter the lubricant injection port 26 to cause clogging.
[0008]
An object of this invention is to provide the propulsion method which solves these problems, and the lubricating material injection method in a propulsion method.
[0009]
[Means for Solving the Problems]
A first invention is an excavator that excavates underground, a propulsion pipe that advances along an excavation hole formed by the excavator, and a lubricant injection device that injects a lubricant into a gap between the propulsion pipe and the excavation hole. In the propulsion method using
The lubricating material injection apparatus, and a recess which is open to the outer peripheral side, a lid composed of elastic material for opening and closing the recess, Ri Tona, thickness of the spacer provided between said lid and said recess It is possible to provide a lubricant reservoir passage to which the lubricant is supplied, and when the lubricant pressure in the lubricant reservoir passage exceeds a predetermined value, the opening / closing lid opens and supplies the lubricant backward. At the same time, when it is less than the predetermined value, earth and sand etc. are prevented from entering the sliding material reservoir passage.
[0010]
According to a second invention, in the first invention, the lubricant injection device includes a lubricant reservoir passage radially divided at equal intervals, a pressure sensor for detecting a pressure of the lubricant in each lubricant reservoir passage, A control valve that controls the inflow of the lubricant into each lubricant reservoir and the control valve that controls the pressure in each lubricant reservoir to be constant based on the detection value detected by the pressure sensor. And a controller.
[0011]
According to a third aspect of the present invention, there is provided a lubricant in a propulsion method in which a drilling hole is formed by an excavator, a propulsion pipe advances along the drilling hole, and a lubricant injection device injects a lubricant into a gap between the propulsion pipe and the drilling hole. In the injecting method, the lubricant injecting device arranges the sliding material reservoir passages each including a concave portion opened on an outer peripheral side and an opening / closing lid formed of an elastic body that opens and closes the concave portion radially at equal intervals. The pressure of the lubricant in the material reservoir passage is detected, and based on the detected value, the flow of the lubricant into each lubricant reservoir passage is controlled so that the pressure in each lubricant reservoir passage becomes constant. The opening / closing lid is opened by pressure, and the lubricant is supplied substantially uniformly from the lubricant reservoir passage to the outer periphery of the propulsion pipe.
[0012]
Operation and effect of the invention
In the first invention, in the propulsion method provided with a lubricant injection device on the front side of the propulsion tube for injecting the lubricant into the gap between the excavation hole formed by the excavator and the propulsion tube, the lubricant injection device includes the lubricant Is formed with a recess that opens to the outer peripheral portion and an open / close lid that is configured by an elastic body that opens and closes the recess, and opens when the pressure in the lubricant reservoir passage exceeds a predetermined value, Lubricant is supplied to the outer periphery of the propulsion pipe located at the rear, and when it is less than the predetermined value, it is closed so that earth and sand etc. do not enter the lubricant reservoir passage. Therefore, it is possible to reduce the frictional resistance generated between the outer periphery of the propulsion pipe and the natural ground, and to promote the long distance and curving of the propulsion pipe etc. by the propulsion method can do.
[0013]
In addition, since it has an open / close lid, it can suppress the intrusion of earth and sand into the lubricating material injection device that supplies the lubricating material, and can prevent the lubricating material injection device from being clogged with the earth and sand. The material can be allowed to flow only in the direction opposite to the propulsion direction, and it is possible to prevent useless supply of the lubricant in the propulsion direction.
[0014]
In the second and third inventions, the lubricant reservoir passages are radially divided at equal intervals, the control valve is arranged upstream of each lubricant reservoir passage, and the pressure of the lubricant in each lubricant reservoir passage is measured by a pressure sensor. Is detected. The detection value detected by the pressure sensor is input to the controller, and based on the detection value, the control valve is controlled so that the pressure in each sliding material reservoir passage becomes constant. Since the lubricant in the passage is supplied to the gap between the excavation hole and the propulsion pipe, pressure variation in the lubricant reservoir passage can be suppressed, and therefore the supply of the lubricant to the outer periphery of the propulsion pipe can be made uniform. Can do.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0016]
FIG. 1 shows a configuration diagram of this embodiment.
[0017]
A shield machine 1 that is excavated through the ground and a fume pipe 2 that is buried in an excavation hole excavated by the shield machine 1 are connected via a lubricant injection device 3. Steel collars 4 having substantially the same diameter as the outer diameters extend rearward from the rear end surfaces of the shield machine 1, the fume tube 2 and the lubricant injection device 3. Further, the outer diameters of the fume tube 2 and the tip of the lubricant injection device 3 are set so as to be fitted to the inner diameter portion of the collar 4. Inside the collar 4 is in contact with the outer diameter of the fume tube 2, and a water stop seal 5 is provided on the entire circumference so that muddy water does not enter the fume tube 2.
[0018]
Next, the detailed structure of the lubricant injection device 3 will be described with reference to FIG.
[0019]
The lubricant injection device 3 is roughly divided into a fitting portion that is fitted to the shield machine 1 and a lubricant injection portion that injects a lubricant.
[0020]
The fitting portion includes an annular member 3a having an outer diameter substantially the same as the inner diameter of the collar 4 of the shield machine 1, and disk-like members 3b and 3c attached to the front and rear of the annular member 3a. At this time, the outer diameter of the disc-shaped member 3c on the rear side of the annular member 3a is larger than the outer diameter of the annular member 3a and is substantially equal to the outer diameter of the fume tube 2.
[0021]
A second annular member 3d constituting the lubricant injection portion is attached to the rear end face of the disc-like member 3c of the fitting portion. Further, a disc-like member 3e is provided on the rear end surface of the second annular member 3d, and the skeleton of the lubricant injection device 3 is configured.
[0022]
A steel collar 4 is provided on the outer periphery of the disk-shaped member 3e, and the outer diameter of the disk-shaped member 3e is set so that the outer diameter of the collar 4 is substantially the same as the outer diameter of the fume tube 2. .
[0023]
On the outer periphery of the second annular member 3d, a lubricant injection lid 6 made of an elastic material is disposed via a spacer 5. The rear end surface of the lubricant injection lid 6 is cut off obliquely, the inclined surface is formed so as to be in contact with the outer peripheral portion of the disk-like member 3e, and a gap formed by the thickness of the spacer 5 is formed as the lubricant reservoir 7. Function. The second annular member 3d is provided with a through hole 3f for supplying the lubricant to the lubricant reservoir 7, and a pipe 3g is connected to the through hole 3f on the inner side of the second annular member 3d. The lubricant is supplied to the lubricant reservoir 7 by opening the injection valve 8 provided at the downstream of 3 g.
[0024]
The injection valve 8 is supplied with a lubricant by a pressure feed pump (not shown).
[0025]
A protective lid 9 is provided on the outer peripheral side of the lubricant injection lid 6 to prevent earth and sand and muddy water from entering the lubricant injection device 3. The length of the protective lid 9 is set so as to cover the outer peripheral portion of the disk-shaped member 3e. In addition, an elastic seal coat material is applied to the inside of the protective lid 9 to block intrusion of earth and sand.
[0026]
The spacer 5, the lubricant injection lid 6, and the protective lid 9 are fastened by bolts 11 and nuts 12 to the front end side of the second annular member 3 d via the fixing plate 10.
[0027]
FIG. 3 is a development view showing the detailed structure of the protective lid 9.
[0028]
As described above, the protective lid 9 is bolted to the second annular member 3d via the fixing plate 10, and the protective lid 9 is formed by stacking a plurality of strip-shaped blocking plates 13 on the outer periphery of the lubricant injection lid 6. It is formed by matching, and each piece is bolted and fixed. The overlapping lengths of the blocking plates 13 are set so that no gap is generated between the blocking plates 13 even when they are spread by the lubricant.
[0029]
It is comprised in this way, Next, an effect | action is demonstrated.
[0030]
When the shield machine 1 performs excavation work, the injection valve 8 is opened, and the lubricant is introduced into the lubricant reservoir 7. When the pressure in the lubricant reservoir 7 becomes equal to or higher than a predetermined pressure, the lubricant spreads the lubricant injection lid 6 and the protective lid 9 in the outer circumferential direction, and the gap between the disc-shaped member 3e is used as an injection port. The lubricant is supplied to the outer periphery of the fume tube 2.
[0031]
Therefore, the lubricant can be injected almost uniformly throughout the outer periphery of the fume tube 2, thereby reducing the frictional resistance generated between the outer periphery of the fume tube 2 and the ground, and the fume produced by the propulsion method is used. It is possible to promote the long distance and curving of the pipes and the like.
[0032]
Further, the lubricant injection lid 6 has a fastening portion with the second annular member 3d on the upstream side, and the injection port opened by the increase in the pressure of the lubricant is opened on the side opposite to the propulsion direction. Further, the outer periphery of the injection port Since the protective lid 9 is provided so as to cover the soil, it prevents the sand and the like from entering the lubricant injection device 3 for supplying the lubricant, and the inlet and the lubricant reservoir 7 are clogged with the sand and the like. This prevents the lubricant from flowing out in the direction opposite to the propulsion direction, and prevents the supply of useless lubricant in the direction of the shield machine 1.
[0033]
When the lubricant is not supplied to the lubricant reservoir 7, or when the pressure does not reach the predetermined pressure, the lubricant injection lid 6 contacts the disc-like member 3e, and earth or the like enters the lubricant reservoir 7. To prevent.
[0034]
As a second embodiment, the lubricant reservoir 7 is divided into a plurality of parts in the circumferential direction, and the lubricant is supplied to each through the injection valve 8. Furthermore, a pressure sensor 14 for detecting the pressure in the lubricant reservoir 7 is provided, and a controller for controlling the opening and closing of the injection valve 8 so that the pressure in each lubricant reservoir is constant based on the detection value of the pressure sensor 7. 15 was provided.
[0035]
With such a configuration, the pressure in the lubricant reservoir 7 can be made constant with high accuracy, and the supply of the lubricant to the outer periphery of the fume tube 2 can be made more uniform.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory diagram of an embodiment of the present invention.
FIG. 2 is a detailed explanatory view of the lubricant supply unit.
FIG. 3 is a development view of the protective lid.
FIG. 4 is a diagram illustrating a conventional example.
FIG. 5 is a diagram for explaining a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield machine 2 Hume pipe | tube 3 Lubricant injection | pouring apparatus 3a 1st annular member 3b Disk shaped member 3c Disk shaped member 3d 2nd annular member 3e Disk shaped member 3f Through-hole 3g Injection pipe 4 Collar 5 Spacer 6 Lubricant injection lid 7 Lubricant reservoir 8 Injection valve 9 Protective lid 10 Fixing plate 11 Bolt 12 Nut 13 Blocking plate

Claims (3)

An excavator that excavates underground,
A propulsion pipe that travels along a drilling hole formed by the excavator;
A lubricant injection device for injecting the lubricant into the gap between the propulsion pipe and the excavation hole;
In the propulsion method using
The lubricant injection device includes a recess opening on the outer peripheral side,
An open / close lid formed of an elastic body that opens and closes the recess;
Tona is, the can by the thickness of the spacer provided between the recess and the lid, comprising a lubricant reservoir passage lubricating material is supplied,
The opening / closing lid opens when the pressure of the sliding material in the sliding material reservoir passage exceeds a predetermined value, and supplies the sliding material to the rear, and when it is below the predetermined value, earth and sand do not enter the sliding fluid reservoir passage. A propulsion method characterized in that the opening / closing lid is closed. The lubricant injection device divides the lubricant reservoir passage radially at equal intervals,
A pressure sensor for detecting the pressure of the lubricant in each lubricant reservoir,
A control valve for controlling the flow of the lubricant into each lubricant reservoir,
A controller that controls the control valve based on the detection value detected by the pressure sensor so that the pressure in each of the lubricant storage passages is constant;
The propulsion method according to claim 1, comprising: Drilling holes by excavator,
In the lubricant injection method in the propulsion method in which the propulsion pipe advances along the excavation hole and the lubricant injection device injects the lubricant into the gap between the propulsion pipe and the excavation hole,
The lubricant injection device includes a recess opening on the outer peripheral side,
An opening / closing lid formed of an elastic body that opens and closes the concave portion, and a sliding material reservoir passage made up of radially arranged at equal intervals,
Detect the pressure of the lubricant in each lubricant reservoir,
Based on the detected value, control the inflow of the lubricant into each lubricant reservoir so that the pressure in each lubricant reservoir is constant,
A method of injecting lubricant in a propulsion method, wherein the opening / closing lid opens at a predetermined pressure, and the lubricant is supplied substantially uniformly from the lubricant reservoir passage to the outer periphery of the propulsion pipe.

Images