JP3792135B2 - Underground pipeline construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an underground pipe construction method in which propulsion pipes are connected one after another to excavators that excavate underground, and propulsion pipes are buried in the ground. Concerning construction of underground pipelines used as pipes.
[0002]
[Prior art]
Conventionally, in the underground pipe burying method, a manhole is provided at the target point of the excavator or the existing pipe is used as the target point, and if the excavator has dug up to the manhole or existing pipe at the target point, the excavator is removed. Another pipe was inserted from the inside of the manhole or the existing pipe toward the tip of the propulsion pipe buried by the excavator and connected to the propulsion pipe. On the other hand, there is one that uses the outer shell of an excavator as it is as a pipe that connects to a manhole or an existing pipe in order to improve work efficiency and effectively use the work machine.
When using the outer shell of the excavator as a pipe, the excavator is structured so that a plurality of outer shell pipes can be bent at a connecting portion so that the direction of travel can be changed. The part is embedded with mortar and used as a tube.
In recent years, there are earthquakes that exceed the allowable range of seismic design, and further improvement of seismic countermeasures is required. In particular, when water and sewage could not be used, it took many days to recover, and the problem was serious because the function of the city was paralyzed.
When a pipe buried in the ground is subjected to force due to ground displacement, etc., it is relatively strong against collapse of the pipe by bending or expanding and contracting over the entire long pipe, but at the connection to a human hole or existing pipe Because the received force concentrates on the connecting part, there is a high risk that the pipeline will collapse and lose its function.
However, if only the strength is increased, there is a high risk that the pipe line will collapse at a position far from the human hole or the existing pipe, and it will be difficult to specify the collapse position, resulting in a longer time for recovery.
Various forces such as contraction, expansion and contraction, and shearing are applied to the connection to the human hole or existing pipe, such as pitching, rolling, ground displacement, and floating due to liquefaction during an earthquake.
Therefore, it is necessary to absorb these displacements when these forces are applied.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to solve these conventional problems, absorb the force and displacement in the tension direction, the compression direction and the shear direction, improve the earthquake resistance, and also when the channel collapses It is to provide an underground conduit construction method that is easy to secure.
[0004]
[Means for Solving the Problems]
The configuration of the present invention that solves this problem is as follows.
1) In the underground pipe construction method in which a propulsion pipe is connected to the rear of an excavator with a rotating excavating blade at the tip, and the propulsion pipe and excavator are propelled to embed the propulsion pipe in the ground, The shell is composed of a plurality of tubular outer shell tubes, and an outer annular engagement portion projecting in an annular shape is provided on one of the opposing surfaces of the tube ends of the outer shell tube to be connected, and an outer annular shape is provided on the opposite surface of the other outer shell tube. An inner annular engagement portion having a smaller diameter than the engagement portion is provided, an annular seal member is provided on the outer periphery of the inner annular engagement portion or the inner periphery of the outer annular engagement portion, and on the inner side of the outer annular engagement portion. An inner annular engagement portion is inserted so that the seal member is compressed between the outer periphery of the inner annular engagement portion and the inner periphery of the outer annular engagement portion to stop water, and the opposing outer shell tubes are connected to a plurality of connection jacks. And excavating the ground using an excavator structured to transmit propulsive force and change propulsion direction. In the underground pipe construction method in which the advance pipe is buried in the ground, after reaching the target point, the excavating blade, the connecting jack, and the inner machine of the excavator are removed, and the outer annular engaging portion and the inner annular engaging portion of the connecting portion of the outer shell pipe are removed. Filling member with moderate elasticity and sealing property is filled from the clearance seal member with the joint to the inside of the pipe, and the inside of the clearance between the outer annular engagement portion and the inner annular engagement portion with the elastic ring ring member The seal member is sealed, and the inside of the ring member is filled with a concrete filler, and the outer shell tube is greatly displaced and deformed due to ground change due to the triple seal of the seal member, the filler member and the ring member. Underground pipe construction method that can secure sealing performance 2) The ring member fixes both ends to the outer annular engagement portion and the inner annular engagement portion, respectively, and a substantially U-shape toward the inside between both ends 1) above which is a structure bent in a shape Underground conduit construction method 3) The underground conduit construction method 4) Outer shell described in 1) or 2) above, wherein the filling member is a silicone resin that cures after filling and has sealing properties and appropriate elasticity. The underground pipe construction method according to any one of 1) to 3), wherein the pipe has a structure having a concrete layer inside, and the propulsion pipe uses a fume pipe having an inner diameter substantially the same as the inner diameter of the outer shell pipe. It is in.
[0005]
[Action]
In the present invention, after the excavator reaches the manhole or the existing pipe at the target point, the excavator blade and the connecting jack at the tip of the excavator are removed to leave only the outer shell pipe. Next, a filling member having appropriate elasticity and sealability is described inside the seal member of the clearance between the outer annular engagement portion and the inner annular engagement portion of the connecting portion of the outer shell tube. Next, the opening inside the clearance between the outer annular engagement portion and the inner annular engagement portion is sealed with an elastic member. By disposing the inner annular engagement portion so as to have a clearance inside the outer annular engagement portion, the displacement in the expansion / contraction direction is absorbed by sliding, and the elasticity of the filling member and the ring member absorbs the expansion / contraction direction. Absorb power. Further, if the slide is within an allowable range, the sealing performance is sufficiently secured by the sealing member, the filling member, and the ring member. For displacement in the shear direction, the displacement in the shear direction is absorbed by tilting the inner annular engagement portion so that there is a gap inside the outer annular engagement portion, and the elasticity of the filling member and ring member is absorbed. To absorb the force in the direction of expansion and contraction. Further, if it is within an allowable range, a sufficient sealing performance is secured by the sealing member, the filling member, and the ring member.
When the ring member has a curved structure such that the projecting portion is formed in a ring shape between both end portions, the ring member is a ring member that easily obtains a displacement in an elastic range in a bending direction or a tensile direction in a shear direction.
When the filling member is a silicone resin, it is cured after filling so as to have sealing properties and appropriate elasticity so that both absorption of external force and sealing properties can be achieved.
When the propulsion tube is a fume tube and a concrete layer is provided inside the outer shell tube, the inner surface of the outer shell tube can be used in the same manner as the inner surface of the fume tube.
The ring member is provided with an annular cement layer on the inner side of the ring member so that the ring member is embedded, so that the inner surface of the outer shell tube of the attachment portion of the ring member can be used in the same manner as the inner surface of the fume tube.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The propulsion pipe includes a fume pipe and an iron pipe, and it is preferable to use them properly depending on the purpose and application.
When a fume pipe is used for the propulsion pipe, a concrete layer is provided on the inner side of the outer shell pipe so that the inner diameter of the fume pipe and the inner diameter of the concrete layer provided on the inner side of the outer shell pipe are the same, so that there is no uneven surface. Therefore, it is preferable that the flow does not become a stagnation place.
The outer shell tube may be formed by connecting two outer shell tubes as an outer shell of an excavator, or may connect two or more outer shell tubes.
It is preferable that the filling member has an adhesive property so that it does not easily leak from the connecting portion of the outer shell pipe even when the pipe line collapses.
[0007]
【Example】
Embodiments of the present invention will be specifically described with reference to the drawings.
1 to 5 show that the ring member has a curved structure so that the projecting portion is formed in an annular shape between both ends, the filling member is a silicone resin, a fume tube is used as a propulsion tube, and the outer shell It is an example of the underground pipe construction method which provided the concrete layer inside the pipe | tube and provided the mortar layer inside the ring member.
FIG. 1 is an explanatory diagram of a connecting portion of an outer shell pipe of an excavator used in the underground conduit construction method of the embodiment. 2-4 is explanatory drawing of the underground conduit construction method of an Example. FIG. 5 is an explanatory view showing a state in which the outer shell tube of the excavator used for the underground conduit construction method of the embodiment is subjected to displacement and deformation.
In the figure, 1 is an excavator, 2 is a drilling blade, 3 is an outer shell tube, 3a is an annular engagement portion, 3b is a concrete layer, 4 is an outer shell tube, 4a is an inner annular engagement portion, 4b is a concrete layer, 4c is a water stop rubber, 5 is a silicone resin, 6 is a ring member, 7 is a mortar, 10 is a connection jack, 11 is a drive unit, 12 is a discharge pipe, 20 is a human hole, and 30 is the ground.
[0008]
In this embodiment, a sewer is added.
The excavator 1 is provided with a drilling blade 2 rotatably at the tip of a cylindrical outer shell tube 3, and a drive unit 11 that rotates the drilling blade 2 by driving inside the outer shell tube 3. A discharge pipe 12 is provided for taking in the earth and sand and gravel and sending it back.
Next, the outer shell 3 is a metal tube, and an outer annular engagement portion 3a is provided at the rear end so as to extend the tube rearward. Next, the concrete layer 3b is provided inside the outer shell 3 from the front end of the outer shell 3 to a predetermined position of the outer annular engagement portion 3a. The inner diameter of the concrete layer 3 b is set to be the same as the inner diameter of the fume pipe 21 connected to the rear of the excavator 1.
Next, the same outer shell tube 4 as the outer shell tube 3 is provided, and an inner annular engagement portion 4 a having a diameter smaller than the outer annular engagement portion 3 a by a predetermined amount is provided at the tube end of the outer shell tube 4. Next, the concrete layer 4b is provided inside the outer shell 4 from the rear end of the outer shell 4 to a predetermined position of the annular engagement portion 4a. The inner diameter of the concrete layer 4 b is set to be the same as the inner diameter of the fume pipe 21 connected to the rear of the excavator 1. Next, an annular water blocking rubber 4c is provided on the outer periphery of the inner annular engagement portion 4a.
Next, the outer shell tube 3 and the outer shell tube 4 are connected so that the inner annular engagement portion 4 a is inserted into the inner hole of the outer annular engagement portion 3 a of the outer shell tube 3. At this time, the water stop rubber 4c is compressed at the inner periphery of the outer annular engagement portion 3a and the outer periphery of the inner annular engagement portion 4a.
Next, the extendable connecting jack 10 is attached at one end near the portion where the outer annular engagement portion 3a is attached to the outer shell tube 3 so as to straddle the outer annular engagement portion 3a and the inner annular engagement portion 4a. The connection jacks 10 are provided at four locations in the circumferential direction.
[0009]
A fume pipe 21 is used as a propulsion pipe connected to the rear end of the outer shell pipe 4. Although not shown, the fume tube 21 used as the propulsion tube is connected and propelled one after another by being pushed in by a propulsion device from a human hole at a starting position.
Next, a silicone resin is prepared as a filling member. As the ring member 6, as shown in FIG. 1, a ring-shaped elastic member having a ring-shaped central portion projecting inwardly is prepared.
[0010]
In order to perform the underground burial work of the present embodiment, excavation is performed from the start point (not shown) by the excavator 1, and the fume pipe 21 is connected to the rear end of the outer shell pipe 4 of the excavator one after another. The fume pipe 21 is buried by pushing the rear end of the fume pipe so as to be pushed. The propulsive force of the outer shell tube 4 propelled by the fume tube 21 connected to the rear end is transmitted to the outer shell tube 3 by the connecting jack 10 and propelled.
In this way, when the fume pipe 21 is buried in the ground and reaches the human hole 20 as the target point, the tip of the outer shell pipe 3 is projected into the human hole 20.
Next, the excavating blade 1, the connecting jack 10 and the like are disassembled and removed from the excavator 1, so that the outer shell pipes 3 and 4 can be used as pipes.
Next, there is an annular clearance between the outer annular engagement portion 3a of the outer shell tube 3 and the inner annular engagement portion 4a of the outer shell tube 4, and the silicone inside the portion sealed with the waterproof rubber 4c. Resin 5 is filled. The silicone resin 5 is cured after filling to have appropriate adhesiveness, sealing property, and elasticity.
Next, the ring member 6 is attached to the annular opening portion inside the annular clearance between the outer annular engagement portion 3 a of the outer shell tube 3 and the inner annular engagement portion 4 a of the outer shell tube 4. As shown in FIG. 1, the ring member 6 has one end at the inner periphery of the outer annular engaging portion 3a and the other end at the inner annular engaging portion 4a so that the U-shaped protruding portion protrudes inward. Attach to the inner circumference of the.
At this time, the ring member 6 is attached between the concrete layers 3 b and 4 b inside the outer shell pipes 3 and 4. When the ring member 6 is attached, the ring member 6 is embedded with the mortar 7 so that the inner circumference and the inner diameter of the fume tube 21 and the concrete layers 3b and 4b are the same.
In this way, the inner circumferences of the outer shell pipes 3 and 4 are similar to the fume pipe 21 and have the same pipe diameter and the same pipe diameter and no flow stagnation.
[0011]
In this way, if the outer shell pipes 3 and 4 of the excavator 1 are used as connecting portions to the human hole 20, the force that expands and contracts the pipe line in the direction of the human hole 20 is displaced by an earthquake or the like. First of all, if the force is small, the strength of the mortar 7 will endure. Even when a stronger force is applied and the mortar 7 portion is crushed, the displacement of the mortar 7 within a predetermined range is caused by the sliding of the outer annular engagement portion 3a and the inner annular engagement portion 4a as shown in FIG. The force is absorbed to some extent by the elasticity of the absorbed and filled silicone resin 5 and ring member 6.
Further, when force and displacement are applied in the direction of shearing or bending the human hole 20, first, if the force is small, it will endure with the strength of the mortar 7. Even when a stronger force is applied and the mortar 7 is crushed, as shown in FIG. 5C, the outer tube 3 and the outer tube 3 are separated by the gap between the outer ring engaging portion 3a and the inner ring engaging portion 4a. As the outer shell tube 4 is inclined, the displacement is absorbed within a predetermined range, and the force is absorbed to some extent by the elasticity of the filled silicone resin 5 and the ring member.
Since the sealing performance is triple sealed with the water stop rubber 4c, the silicone resin 5, and the ring member 6, it is easy to ensure the sealing performance even when the displacement or force can be absorbed. Yes.
Therefore, it is easy to secure water stoppage and sewage in the event of an earthquake, etc., prevent secondary disasters due to sanitary problems such as sewage leaking, and secure drinking water. And reduce the number of work points for recovery.
[0012]
6 and 7 show another example of the embodiment.
In the figure, 22 is an iron pipe.
In another example of the embodiment, an iron pipe 22 is used as a propulsion pipe. As described above, the propulsion pipe may be determined based on the purpose and application. In some cases, the concrete layers 3b and 4b and the mortar 7 may not be provided inside the outer shell pipes 3 and 4.
[0013]
【The invention's effect】
According to the present invention, it is possible to absorb force and displacement in the pulling direction, compression direction, and shearing direction, improve earthquake resistance, and easily secure a flow path even when collapsed.
The ring member has a curved structure with a ring-shaped protrusion between both ends, which can absorb more displacement and force, and can secure sealing performance even when displaced, further improving earthquake resistance it can.
When the filling member is a silicone resin, more force can be absorbed, and the sealing property can be improved to further improve the earthquake resistance.
The propulsion tube is a fume tube, and the one with a concrete layer inside the outer shell tube and the one with an annular cement layer inside the ring member embedded with the ring member are used as the outer tube as the fume tube. It can be used, work can be done efficiently, and the amount of removed items can be reduced.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a connecting portion of an outer shell pipe of an excavator used in an underground conduit construction method of an embodiment.
FIG. 2 is an explanatory diagram of an underground conduit construction method according to an embodiment.
FIG. 3 is an explanatory diagram of an underground conduit construction method according to an embodiment.
FIG. 4 is an explanatory diagram of an underground conduit construction method according to an embodiment.
FIG. 5 is an explanatory view showing a state in which the outer shell tube of the excavator used in the underground conduit construction method of the embodiment is subjected to displacement / deformation.
FIG. 6 is an explanatory diagram of an excavator used in another example of the underground conduit construction method according to the embodiment.
FIG. 7 is an explanatory diagram of a connecting portion of an outer shell pipe of an excavator used in another example of the underground conduit construction method of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator 2 Excavation blade 3 Outer shell pipe 3a Outer ring engagement part 3b Concrete layer 4 Outer shell pipe 4a Inner ring engagement part 4b Concrete layer 4c Water blocking rubber 5 Silicone resin 6 Ring member 7 Mortar 10 Connection jack 11 Drive part 12 discharge pipe 20 human hole 21 fume pipe 22 iron pipe 23 outer shell pipe 23a outer annular engagement portion 23b concrete layer 24 outer shell tube 24a inner annular engagement portion 24b concrete layer 30 ground

Claims (4)

In the underground pipe construction method in which a propulsion pipe is connected to the rear of an excavator equipped with a rotating excavating blade at the tip, and the propulsion pipe and the excavator are propelled to embed the propulsion pipe in the ground, the outer shell of the excavator is Consists of a plurality of tubular outer shell tubes, and is provided with an outer annular engagement portion projecting annularly on one of the opposing surfaces of the tube ends of the outer shell tube to be connected, and the outer annular engagement on the opposite surface of the other outer shell tube An inner annular engagement portion whose diameter is smaller than the inner portion is provided, an annular seal member is provided on the outer periphery of the inner annular engagement portion or the inner periphery of the outer annular engagement portion, and the inner annular engagement portion is provided on the inner side of the outer annular engagement portion. Inserting the engaging part, the seal member is compressed between the outer periphery of the inner annular engaging part and the inner periphery of the outer annular engaging part to stop water, and the opposing outer shell pipes are connected by a plurality of connecting jacks. The excavator is excavated in the ground using an excavator structured to transmit the propulsive force and change the propulsion direction. In the underground pipe construction method to be buried in the ground, after reaching the target point, the excavating blade, the connecting jack and the excavator internal device are removed, and the outer annular engaging portion and the inner annular engaging portion of the connecting portion of the outer shell pipe are removed. A filling member having appropriate elasticity and sealing property is filled from the clearance seal member to the inside of the tube, and an opening inside the clearance between the outer annular engagement portion and the inner annular engagement portion is formed with an elastic ring member. Sealing, filling the inside of the ring member with concrete filler, and sealing performance even if the outer shell tube is greatly displaced or deformed due to ground change due to triple seal of sealing member, filling member and ring member Underground conduit construction method that can secure 2. The underground conduit according to claim 1, wherein the ring member has a structure in which both ends are fixed to the outer annular engagement portion and the inner annular engagement portion, respectively, and the portion between both ends is bent in a substantially U shape toward the inside. Construction method. The underground conduit construction method according to claim 1 or 2, wherein the filling member is a silicone resin that is cured after filling and has a sealing property and appropriate elasticity. The underground pipe construction according to any one of claims 1 to 3, wherein the outer shell pipe has a structure having a concrete layer on the inner side, and the propulsion pipe uses a fume pipe having an inner diameter substantially the same as the inner diameter of the outer shell pipe. Construction method.

Images