JP5161948B2 - Promotion method - Google Patents

Description

The present invention relates to a technique for constructing a pipeline by excavating through the ground without excavating the ground surface, and particularly relates to a propulsion method for suitably embedding a propulsion pipe having a screw lid in the ground.

  Traditionally, as a method of burying pipes to construct sewers and other pipes in the ground, excavating the ground surface and excavating the ground surface by digging the ground surface and laying a ready-made pipe on the bottom It is also known as a non-open cutting method that excavates and penetrates the ground.

  The non-open cutting method includes a shield method that digs the ground with a digging machine, assembles segments behind it and finishes the inner surface with a lining material, and a pre-made pipe called a propulsion pipe (fume pipe, steel pipe, ductile pipe, There is a propulsion method that pushes double-structure steel pipes, box culverts, etc.) into the ground.

  Of these, the propulsion method digs a resisting (starting resisting / reaching resisting) at both ends of the pipeline, pushes the excavator and the propelling pipe into the ground with a jack from the starting resist, After that, propulsion pipes are added one after another, so that a pipe line connecting the propulsion pipes from the start to the end is built in the ground.

  Here, the excavator has a cutter head at the front end, and the cutter head advances a drilling resistance larger than the diameter of the subsequent excavator main body and the propulsion pipe. A drug injection hole is opened, and a predetermined drug is injected from the inside of the propulsion pipe into the space between the inner periphery of the drilling anti-tube and the outer periphery of the propulsion pipe through the drug injection hole (Patent Document 1).

  For example, a lubricant is injected into the gap as a chemical agent to reduce the propulsion resistance of the excavator or the propelling pipe, or a curable resin is used to completely fill the gap when the excavator reaches the ultimate resistance. Grouting agent (backfilling agent) such as cement paste or cement mortar. As shown in FIG. 9, a check valve V is usually installed in the drug injection hole H in order to prevent the drug backflow.

Japanese Patent Application Laid-Open No. 11-256988

  However, according to the conventional propulsion method, when the propulsion pipe P advances in the excavation anti-T as shown in FIG. 9A, the stone S collides with the outer opening edge of the drug injection hole H, and the advancement of the excavation machine proceeds. It could be an obstacle. In addition, there is a problem that the pressure S and water tightness are hindered due to the collision of the stone S, as shown in FIG.

  In particular, in a fume pipe (centrifugal reinforced concrete pipe) often used as the propulsion pipe P, cracks reaching the inside of the fume pipe may spread over a wide area and may be repaired. However, the fume pipe is highly compacted by centrifugal force. Since it is made of PC concrete that is strong and excellent in water tightness, the original high strength and high water tightness of the fume tube cannot be recovered even if the cracked portion is repaired.

  The present invention has been made in view of the circumstances as described above. The purpose of the present invention is to prevent the propulsion pipe from being deformed or broken by the debris in the excavation shaft dug by the excavator. It is to be able to proceed smoothly in the drilling hole.

Since the present invention is to achieve the above object, a drug infusion holes propulsion tube having an opening with a female screw portion in the tube wall is connected to the rear of the excavator, the propulsion tube to be sequentially spliced to the excavator to its successor In the propulsion method of constructing a pipe line by the propulsion pipe in the ground by pressing it with a jack and making it enter the ground,
A screw cap having a concave cross section provided with an end plate at one end of a cylindrical body portion in which a discharge port having a predetermined opening area and a male screw portion corresponding to the female screw portion of the drug injection hole are formed. Use
Before the propulsion tube enters the ground, the screw lid is attached to the drug injection hole from the outside of the propulsion tube by coupling the female screw portion and the male screw portion, and the end plate portion is propelled. Positioned at the open end of the drug injection hole on the outer periphery side of the tube,
After allowing the propulsion pipe to enter the ground, the inner circumference of the excavation resistor digged by the excavator through the drug injection hole and the discharge port of the screw lid from the inside of the propulsion pipe and the propulsion pipe The present invention provides a propulsion method characterized by supplying a drug into a gap between the outer periphery.

In the propulsion method according to the present invention, a cylindrical body portion in which a discharge port having a predetermined opening area and a male screw portion corresponding to the female screw portion of the drug injection hole opened in the tube wall of the propulsion tube are formed. Using a screw cap with a concave cross section with an end plate at one end of the screw, before the propelling tube enters the ground, the screw cap is connected from the outside of the propelling tube by coupling the female screw portion and the male screw portion. Since it is attached to the injection hole and the end plate portion is positioned at the opening end of the drug injection hole on the outer peripheral side of the propulsion pipe, when the propulsion pipe advances through the excavation tunnel digged by the excavator, It is possible to prevent the stone in the excavation shaft from biting into the outer opening edge of the drug injection hole and hindering the progress of the propulsion tube.

  In addition, since the periphery of the drug injection hole can be prevented from being destroyed by a stone crash, the propulsion pipe can be buried in the ground without being deformed or destroyed.

Explanatory drawing showing the propulsion method according to the present invention Schematic perspective view showing an example of a propelling pipe used in the present invention FIG. 3 is a partial cross-sectional view along the axis of the propelling tube shown in FIG. 2, (a) is a vertical cross-sectional view showing a portion of a drug injection hole, and (b) is a vertical cross-section showing a state where a screw lid is attached to the drug injection hole. Figure The perspective view which shows the screw cover used by this invention Plan view of the screw cap shown in FIG. The perspective view which shows the screw lid used by this invention , and its fastening tool Cross-sectional view of relevant parts showing a state when a propulsion pipe with a screw lid used in the present invention is buried in the ground Partial sectional view of a pipe constructed using a propelling pipe with a screw lid used in the present invention Explanatory drawing showing the state where the propulsion pipe is buried in the ground by the conventional method

  Hereinafter, the present invention will be described in detail with reference to the drawings. First, referring to FIG. 1, the propulsion method for constructing a pipeline in the ground will be outlined. 1 is a start-up resistance that digs down a position to be an excavation start end for constructing a pipeline, and 2 is a position to be an end excavation end. A double-acting jack 3 (hydraulic jack) is installed in the start-up resistance 1, and a propulsion pipe 4 connected to the excavator M and its rear part by the jack 3. Is configured to be pushed into the ground toward the ultimate resistance 2. In particular, the propulsion pipe 4 is lowered from the ground into the starter 1 by the crane 5 and sequentially added to the succeeding of the excavating machine M, and the addition and pushing are repeated.

  The excavator M is a known device having a cutter head M2 at the front end of a cylindrical excavator main body M1 with a built-in motor and the like. The cutter head M2 is provided with a carbide bit that is rotationally driven. . Then, the excavating machine M digs in the ground while receiving back pressure (propulsive force) from the jack 3 via the propulsion pipe 4, and the subsequent propulsion pipe 4 advances in the excavation anti-T thus dug. When the leading excavator M reaches the reaching resistance 2, the excavating machine M is lifted from the ground by the crane 5 and collected, and the propulsion pipe 4 is provided between the starting resistance 1 and the reaching resistance 2. A continuous pipeline will be constructed.

  FIG. 2 shows a propulsion pipe used in the propulsion method as described above. In FIG. 2, the propulsion tube 4 is a fume tube (centrifugal reinforced concrete tube) having a diameter of 800 mm and a length of 2430 mm, and two drug injection holes 41 are opened at predetermined intervals on the tube wall. The drug injection hole 41 is for injecting a predetermined drug from the inside of the propulsion pipe 4 into the gap between the inner periphery of the excavation resist and the outer periphery of the propulsion pipe dug by the excavator. This is also used as a hole for suspending by the crane 5 as shown in FIG. In FIG. 1, 51 is a male screw member attached to the drug injection hole 41, 52 is a hanging girder connected to the male screw member 51, and the central part of the hanging girder 52 and the hook of the crane 5 are connected by a wire 53. It is.

  Next, FIG. 3 shows a cross section of the drug injection hole. As is clear from this figure, a nut member N is embedded in the tube wall of the propelling tube 4, and the inside of the nut member N is opened as a drug injection hole 41. The drug injection hole 41 is a through-hole that communicates with the inner periphery (female screw portion 41a) of the nut member N that opens inside the propelling tube 4 and opens to the outside with the outer peripheral side of the propelling tube 4 as a tapered portion 41b. A check valve V is attached to the female screw portion 41a from the inside of the propulsion pipe 4, and a metal screw lid 6 is attached to the outer peripheral side of the check valve V. The check valve V is used to prevent the backflow of the medicine into the propelling tube 4 and the inflow of groundwater, and is coupled to the outer periphery of the valve seat V2 that supports the valve body V1 with the female screw portion 41a. A male thread portion is formed.

On the other hand, the screw lid 6 is a member having a concave cross section having a cylindrical body portion 61 and an end plate portion 62 that closes one end of the body portion, and the other end side of the body portion 61 without the end plate portion 62. On the outer periphery of the (opening side), a male screw portion 61a that is coupled to the female screw portion 41a is formed. Further, the body portion 61 is formed with a horizontally long discharge port 61b having a predetermined opening area (about 4 cm ^{2 in} this example) between the end plate portion 62 and the male screw portion 61a. Can be spilled.

  In particular, the screw cap 6 is attached to the drug injection hole 41 so that the end plate portion 62 is positioned at the opening end (outer opening end) of the drug injection hole 41 on the outer peripheral side of the propelling tube 4. The discharge port 61 b faces the peripheral surface portion of the tapered portion 41 b of the injection hole 41.

  In addition, in this example, although the trunk | drum 61 and the end plate part 62 which comprise the screw cover 6 are joined and integrated by welding, both can also be integrally formed from a metal material.

As apparent from FIGS. 4 and 5 , in the screw lid 6 used in the present invention , semicircular cutout portions 62 a are formed at equal intervals in the circumferential direction at three peripheral edges of the end plate portion 62. The screw lid 6 is fastened and attached to the drug injection hole 41 by using the notches 62a.

  FIG. 6 shows a tool for fastening a screw lid to the drug injection hole. The tool 7 has a handle 71 for turning in a T shape and a cylindrical tool body 72 fixed to the lower end of the handle 71, and the tool body 72 corresponds to the notch 62 a of the screw lid 6. A cylindrical claw 72a is formed. According to the tool 7, the claw 72 a is locked to the notch 62 a of the screw lid 6, and the handle 71 is rotated in this state, whereby the screw lid is formed on the drug injection hole 41 from the outside of the propelling tube 4. 6 can be mounted easily and quickly.

  Here, in order to construct a pipe line by the propulsion pipe 4 in the ground by the propulsion method outlined above, the propulsion pipe 4 enters the ground by the pressing force by the jack 3 from the starting stand 1 shown in FIG. Before making the drug injection hole 41 of the propulsion tube 4 into the drug injection hole 41 from the outside of the propulsion tube 4 by connecting the screw cap 6 to the female screw part 41a and the male screw part 61a as shown in FIG. 41 and the end plate portion 62 of the screw lid 6 is positioned at the opening end of the drug injection hole 41 on the outer peripheral side of the propelling tube 4. Further, as shown in FIG. 7, a check valve V is attached to the medicine injection hole 41 from the inside of the propelling pipe 4 and one end of the medicine feeding pipe 8 is connected to the medicine injection hole 41.

  Thus, after the propelling tube 4 has entered the ground, a predetermined medicine is supplied from the ground into the medicine injection hole 41 through the medicine feeding pipe 8. Then, the valve body V1 of the check valve V is opened in a V shape as indicated by a one-dot chain line in FIG. 7 due to the pressure of the medicine, and thereby the medicine flows into the screw lid 6. Furthermore, the medicine that has flowed into the screw cap 6 flows out into the gap G between the inner periphery of the excavation anti-T and the outer periphery of the propelling tube 4 through the discharge port 61b.

  Incidentally, when the propulsion pipe 4 advances in the excavation anti-T, the propulsion resistance of the propulsion pipe 4 is reduced by supplying a lubricant as a chemical to the gap G. For this reason, the propulsion pipe 4 can smoothly travel in the excavation anti-T under a low load. In addition, according to the present invention, the screw lid 6 is attached to the drug injection hole 41 on the outer peripheral side of the propulsion tube 4, so that the stone in the excavation anti-T bites into the opening edge of the drug injection hole 41. It is possible to prevent the progress of the above-described process or the surroundings of the drug injection hole 41 from being destroyed by a stone crash. For this reason, it becomes unnecessary to repair the propulsion pipe 4 immediately after embedding, and the pressure resistance and water tightness of the propulsion pipe 4 can be maintained in an expected state.

  On the other hand, when the excavator M shown in FIG. 1 reaches the ultimate resistance 2, a grouting agent U such as a curable resin, cement paste, or cement mortar is supplied to the gap G as a medicine as shown in FIG. As a result, the gap G is completely filled, and the drug injection hole 41 is also completely closed by the filler f such as mortar on the inner peripheral side of the propulsion tube 4, whereby the stability of the propulsion tube 4 and the water stoppage are improved. Performance will be ensured.

  7 shows a vertical cross section around the drug injection hole 41 along the axis of the propulsion tube 4, and FIG. 8 shows a cross section around the drug injection hole 41 perpendicular to the axis of the propulsion pipe 4.

Although the preferred embodiment of the present invention has been described above, the propulsion pipe 4 is not limited to the fume pipe (the standard product includes those of 1200 mm and 800 mm in addition to the length of 2430 mm), but also a steel pipe, a ductile pipe, and a double structure. A steel pipe or the like may be used, and the form is not limited to a cylindrical shape, and a rectangular pipe such as a box culvert may be used. In addition, since the thing provided with the above chemical | medical agent injection holes 41 as an existing propulsion pipe is limited to a fume pipe | tube with a diameter of 800 mm or more, a fume pipe | tube with a diameter of 800 mm or more is also used as a propulsion pipe used by this invention. it is preferred.

M Excavator T Drilling Anti-G Gap 3 Jack 4 Propulsion Pipe 41 Drug Injection Hole 41a Female Screw 6 Screw Cover 61 Body 61a Male Screw 61b Discharge Port 62 End Plate 62a Notch 7 Tool 72a Claw

Claims (1)

A propelling pipe having a female injection hole in the pipe wall and having a drug injection hole opened is connected to the rear part of the excavator, and the excavator and the propelling pipe sequentially added thereafter are pressed with a jack to enter the ground. In the propulsion method of building the pipeline by the propulsion pipe in the ground,
A screw cap having a concave cross section provided with an end plate at one end of a cylindrical body portion in which a discharge port having a predetermined opening area and a male screw portion corresponding to the female screw portion of the drug injection hole are formed. Use
Before the propulsion tube enters the ground, the screw lid is attached to the drug injection hole from the outside of the propulsion tube by coupling the female screw portion and the male screw portion, and the end plate portion is propelled. Positioned at the open end of the drug injection hole on the outer periphery side of the tube,
After allowing the propulsion pipe to enter the ground, the inner circumference of the excavation resistor digged by the excavator through the drug injection hole and the discharge port of the screw lid from the inside of the propulsion pipe and the propulsion pipe A propulsion method characterized by supplying a medicine into a gap between the outer periphery.

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