JP5650554B2 - Water stoppage propulsion structure for wellheads in propulsion work - Google Patents

Description

  The present invention relates to a water stop propulsion structure for a wellhead in propulsion work. More specifically, the present invention relates to a water stop propulsion structure for a wellhead that propels an excavator or a buried pipe while preventing inflow of groundwater or the like from a wellhead opened to a start shaft.

  Conventionally, as a water stop propulsion structure for a wellhead in a propulsion work in which a sewer pipe or the like is laid in the ground, for example, one described in Patent Document 1 is known. Specifically, the wellhead propulsion structure in the wellhead in the propulsion work described in Patent Document 1 is a waterstop with the excavator 102 inserted in a waterstopper 107 attached to the wellhead 101 as shown in FIG. A frame 103 that surrounds the outer periphery of the body of the excavator 102 is attached to the rear end of the vessel 107.

  The water stop 107 includes a cylindrical outer shell 108 with a flange so as to surround the outer periphery of the body of the excavator 102, a water stop rubber 109 that closely contacts the cylindrical outer shell 108 with the outer periphery of the body of the excavator 102, A holding plate 110 to which the rubber 109 is attached is provided.

  Furthermore, a support portion 106 is formed by filling a hollow portion 104 between the excavator 102 and the frame body 103 with a hardener (green concrete) 105.

  In the water stop propulsion structure in the wellhead in the propulsion work described in Patent Document 1, by adopting such a structure, the frame body 103 and the hardener 105 are integrated into the large runout generated during the initial propulsion of the excavator. The outer peripheral surface of the excavating machine 102 is closely supported by the support unit 106, and it is possible to prevent inflow of groundwater or the like due to the reverse dripping of the water stop rubber 109 and the planned linear deviation of the excavating machine 102.

  Here, after the propulsion work is completed, the support portion 106 in which the frame body 103 and the hardener 105 are integrated with the waterstopper 107 remaining is dismantled and removed.

  As shown in FIG. 7, a buried pipe 113 is provided in the vertical shaft 112. When the buried pipe 113 is backfilled with earth or sand excavated in the vertical hole 112, the buried pipe 113 is filled with soil. The need to protect against pressure arises.

  Accordingly, a reinforcing bar is newly incorporated from the wellhead so as to surround the outer periphery of the buried pipe 113, and concrete is placed in a mold that encloses the reinforcing bar, and the protective concrete 114 is attached.

Japanese Patent No. 4512072

  However, the dismantling and removal of the concrete at the entrance in the shaft is forced to be harsh due to dust, noise, etc. in order to work with a concrete breaker or the like in a limited space.

  The demolished concrete is drawn up to the ground and processed as industrial waste. Therefore, many work days are required to dismantle and remove the wellhead concrete.

  The present invention was devised in view of the above points, and provides a water stop propulsion structure for a wellhead in propulsion work that enables the installation of protective concrete in a state where the wellhead support is left behind. It is the purpose.

  In order to achieve the above-mentioned object, the water stop propulsion structure in the wellhead in the propulsion work according to the present invention has one end abutting along the opening edge of the wellhead and being inserted into the wellhead along the peripheral edge of the other end. A water stop fitted with a water stop rubber so as to be in close contact with the outer peripheral surface of the machine, a rebar assembled to surround the water stop along the outer peripheral surface of the water stop, the water stop and A wellhead support unit integrally formed with concrete so as to surround the reinforcing bar and in close contact with the outer peripheral surface of the excavator.

  Here, one end abuts along the opening edge of the wellhead, and a waterproof rubber is attached so as to be in close contact with the outer peripheral surface of the excavator inserted into the wellhead along the periphery of the other end. It becomes possible to prevent the ejection of groundwater and earth and sand from the wellhead.

  In addition, it is integrally molded with concrete in a state of being in close contact with the outer peripheral surface of the excavator so as to surround the water stop and the reinforcing bar so as to surround the water stop along the outer peripheral surface of the water stop. By providing the wellhead support portion, it is possible to secure watertightness by restraining the excavator and preventing the water-stopping rubber from turning over.

  In addition, after completion of the propulsion work, construction of protective concrete is carried out to protect the buried pipe installed in the shaft from the earth pressure backfilled in the shaft, but the protective concrete is not removed without dismantling the wellhead support. It can be used as a part.

  Moreover, it is preferable that the wellhead support part reinforcing bar is integrated by joining the reinforcing bars during construction of the protective concrete by arranging the same reinforcing bars as those assembled during the construction of the protective concrete. .

  In addition, by connecting a reinforcing bar joint to one end of the reinforcing bar in a state where it is exposed to the open end face of the wellhead support part, it is easy to connect to the reinforcing bar assembled during the construction of protective concrete. It is preferable to do.

  In addition, by having a shock absorber fixed to the wellhead support part between the wellhead support part and the outer peripheral surface of the excavator, the shock caused by the excavation machine shake is alleviated and the adhesion to the buried pipe is secured. Is preferred.

  In addition, it is preferable to reduce friction between the excavator and the shock absorber by interposing a lubricant between the shock absorber and the outer peripheral surface of the excavator.

  According to the water stop propulsion structure in the wellhead in the propulsion work of the present invention, it is possible to install protective concrete with the wellhead support part remaining.

It is a schematic diagram for demonstrating the outline | summary of the propulsion work in the water stop propulsion structure of a wellhead in the propulsion work to which this invention is applied. It is a schematic diagram for demonstrating an example which attached the water stop to the wellhead in the water stop propulsion structure of the wellhead in the propulsion construction to which this invention is applied. It is a schematic diagram for demonstrating an example of the water stop propulsion structure of a wellhead in the propulsion construction which applied this invention. It is a schematic diagram for demonstrating the construction example of the protective concrete by the water stop propulsion structure of a wellhead in the propulsion construction to which this invention is applied. It is a schematic diagram for demonstrating the state after construction of the protective concrete by the water stop propulsion structure of a wellhead in the propulsion construction to which this invention is applied. It is a schematic diagram for demonstrating an example of the water stop propulsion structure of the conventional wellhead. It is a schematic diagram for demonstrating the construction example of the protective concrete by the water stop propulsion structure of the conventional wellhead.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.

  FIG. 1 is a schematic diagram for explaining an outline of propulsion work in a water stop propulsion structure at a wellhead to which the present invention is applied.

  In the propulsion work shown here, the bearing wall 2 is arranged on the wall surface in the start shaft 1, and the base end is supported on the starting frame 3 placed on the bottom surface in a state of being connected to the bearing wall 2. The main push jack 4 is installed while being supported by the pressure wall 2.

  Furthermore, a wellhead 5 is opened on the opposite wall surface of the main push jack 4, and the base end of the excavator 6 is pushed out by the main push jack 4 so that the excavation cutter 7 at the tip of the excavator 6 passes through the wellhead 5 and the ground. A buried pipe (not shown) is laid while excavating the mountain A.

  Here, FIG. 2 (FIG. 2 (a)) shows a schematic side view for explaining an example in which a water stop is attached to the wellhead in the present invention, and FIG. 2 (b) shows a waterstop at the wellhead in the present invention. The front schematic diagram for demonstrating the example which attached is shown.) Is a schematic diagram for demonstrating an example which attached the water stop to the wellhead in the waterwell propulsion structure of the wellhead in the propulsion construction which applied this invention. .

  A water stop 9 is attached by welding to a wellhead 5 having an inner diameter into which a drilling cutter 7 provided at the tip of the excavating machine 6 can be inserted into a wall surface (mountain retaining material) 8 in the start shaft 1.

  The water stop 9 includes a water stop pit portion 10 having a cylindrical shape, a flange portion 11 provided around a base end opening edge of the water stop pit portion 10, a presser plate 12 and a comb shape on the flange portion 11. It is comprised by the water stop rubber 14 attached with the adjustment board 13. As shown in FIG.

  The water stop rubber 14 has an inner diameter smaller than the outer diameter of the excavator 6 and the buried pipe (not shown), and the excavator 6 and the water stop rubber 14 in a state where the inner peripheral edge of the water stop rubber 14 is bent. It is set as the structure closely_contact | adhered to the outer peripheral surface of a buried pipe (not shown).

  Next, FIG. 3 (FIG. 3 (a)) shows a schematic side view for explaining an example of the water stop propulsion structure of the wellhead in the propulsion work to which the present invention is applied, and FIG. 3 (b) applies the present invention. FIG. 2 is a schematic front view for explaining an example of a water stop propulsion structure for a wellhead in propulsion work.) Is a schematic diagram for explaining an example of a water stop propulsion structure for a wellhead in propulsion work to which the present invention is applied. .

  Here, a gel-like lubricant (not shown) such as grease oil is applied to the outer peripheral surfaces of the excavator 6 and the buried pipe (not shown). Further, a buffer band 16 whose outer surface is formed in a concavo-convex shape is wound around the digging machine 6 and a buried pipe (not shown), and adjusted so that the tip side thereof is at the position of the water stop rubber 14.

  A plurality of main reinforcing bars 17 are assembled so as to surround the water blocking pit 10 of the water stop 9 attached in this way, and the distribution bars 18 orthogonal to the main reinforcing bars 17 are used when constructing the protective concrete. The bars are arranged at regular intervals.

  The front end of the force distribution bar 18 is in contact with the wall surface 8 and a reinforcing bar joint 19 is attached to the base end thereof. As shown in FIG. 4, the reinforcing bar joint 19 is open at both ends, and an internal thread (not shown) is formed on the inner peripheral surface thereof.

  Further, a male screw (not shown) formed on the outer peripheral surface of the distribution bar 18 is screwed from one opening end of the reinforcing bar joint 19 to a substantially central position of the female screw.

  Here, the formwork 15 is assembled in a state of being in contact with the other opening end of the reinforcing bar joint 19. The mold 15 is closely attached to the outer peripheral surface of the excavator 6 so as to surround the water stop 9, the main reinforcing bar 17 and the distribution bar 18 with the wall surface 8.

  By injecting the ready-mixed concrete 20 into the mold 15 assembled in this way, the wellhead support 24 in which the waterstop 9, the main reinforcing bar 17 and the distribution bar 18 are integrated with the ready-mixed concrete 20 is formed. It will be.

  The well wall 24 moves forward while the peripheral wall surface of the excavator 6 is supported by the buffer 16 of the well support 24. Therefore, by applying the lubricant to the peripheral wall surface of the buried pipe (not shown) that is sequentially connected to the rear end of the excavator 6, it can be held without being shaken by vibration or the like.

  In addition, although a present Example explains in full detail about the case where a water stop pit part is a cylindrical shape, an excavation machine is not necessarily a cylindrical shape, and there exists a rectangular or irregular circular shape.

  Therefore, the shape of the wellhead is also matched to the shape of the excavator, but by attaching the formwork so as to surround the outer periphery of the excavator body, the ready-mixed concrete poured into the formwork It becomes a water stop propulsion structure that is in close contact with the outer periphery of the fuselage and has improved water tightness.

  Further, the bar arrangement structure according to the present embodiment can be firmly integrated with the protective concrete, but it is not always necessary to have a bar arrangement structure composed of main reinforcing bars and bar arrangement bars.

  For example, when the bottom surface of the shaft is soft ground, the reinforcing concrete reinforcement structure may be a bi-directional main reinforcement, and it is preferable to have a reinforcement arrangement that matches the reinforcement concrete arrangement structure.

  Further, the reinforcing bar joint according to the present embodiment makes it possible to easily connect to the reinforcing bar assembled in the construction of the protective concrete, but it is not always necessary to provide the reinforcing bar joint. .

  For example, it may be configured to connect rebars assembled to construct protective concrete by welding, but in order to avoid danger due to rebar protrusion into the shaft and to improve work efficiency, It is more preferable to employ a mechanism for providing.

  Further, the shock absorber according to the present embodiment alleviates the impact caused by the swing of the excavator and ensures adhesion with the buried pipe, but it is not always necessary to provide the shock absorber.

  For example, in the case of soil that is expected to reduce excavation machine swing, it may be configured not to provide a buffer, but in terms of improving the close contact with the outer periphery of the excavator fuselage, It is preferable to provide the provided configuration.

  Further, the lubricant according to the present embodiment can reduce friction between the excavator and the shock absorber by interposing the lubricant between the shock absorber and the outer peripheral surface of the excavator. It is not always necessary to provide a lubricant.

  For example, a material with a small coefficient of friction may be adopted for the shock absorber, or water may be constantly injected between the shock absorber and the outer peripheral surface of the excavator, but reliability and work efficiency are improved. It is preferable to apply a gel-like lubricant such as grease oil.

  In such a water stop propulsion structure according to the present invention, first, high-concentration mud water is injected into the gap between the water stop well portion 10 and the propulsion unit 6 so as to have a required pressure.

  Here, as described in detail in FIG. 1, excavation work is performed so that the excavation cutter 7 is driven and rotated and the excavator 6 is pushed into the natural ground A by the main push jack 4.

  The initial process until the excavator 6 is settled in the natural ground A is the process in which the earth and sand collapse and the planned linear deviation of the excavator are the most among the entire propulsion processes up to the reach shaft.

  Thus, the large runout generated during the initial propulsion of the excavator 6 is caused by the excavator 6 by the wellhead support 24 in which the waterstop 9, the main rebar 17 and the distribution bar 18 of the waterstop pier 10 are integrated with raw concrete. It becomes possible to suppress by supporting the surrounding wall surface.

  Further, the buffer body 16 can alleviate the impact caused by the swinging of the excavator 6 and can secure adhesion with the buried pipe. Further, the lubricant such as grease oil can reduce friction between the excavator body 6 and the buffer body 16.

  Moreover, FIG. 4 (FIG. 4 (A)) shows the side schematic diagram for demonstrating the construction example of the protective concrete by the water stop propulsion structure of the wellhead to which this invention is applied, FIG. 4 (B) applied this invention. The side schematic diagram for explaining the construction example of the protective concrete by the water stop propulsion structure of the wellhead is shown.) Is a schematic diagram for explaining the construction example of the protective concrete by the waterstop propulsion structure of the wellhead to which the present invention is applied. is there.

  Here, after completion of the propulsion work, the lubricant applied between the buffer 16 of the wellhead support 24 and the buried pipe C is removed, and after cleaning, cement milk or the like (not shown) is injected.

  Next, as shown in FIG. 5, the protective concrete 25 protects the outer peripheral surface of the buried pipe C in order to protect the buried pipe C laid in the start shaft 1 from the earth pressure of the earth and sand D backfilled in the start shaft 1. Attached to surround.

  The protective concrete 25 is first subjected to surface treatment such as chipping on the concrete joint surface 27 and then to the female thread (not shown) of the reinforced joint 19 exposed on the end face of the wellhead support 24 in the protective concrete 25. The reinforcing bar 18A is screwed and connected to the main reinforcing bar 17A.

  Thus, the mold 15A can be assembled so as to surround the main reinforcing bar 17A and the distribution bar 18A assembled around the buried pipe C.

Furthermore, the protective concrete 25 is formed so that the circumference | surroundings of the buried pipe C may be surrounded by the ready-mixed concrete 20 being placed in the mold 15A.
In the figure, reference numeral 28 denotes a manhole for entering and leaving the buried pipe C from the ground.

  In the water stop propulsion structure in the wellhead in such construction, it can be used as protective concrete without tearing down the wellhead support portion after the completion of the propulsion work.

  Moreover, since the dismantling and removal work of the wellhead support portion is not required after the completion of the propulsion work, severe work due to dust, noise, etc. is eliminated, and the work days are considerably shortened.

  In addition, by arranging a reinforced joint on the joint surface of the wellhead support part with the protective concrete, it can be easily connected to the reinforcing bar arranged in the protective concrete without welding, etc. Can be integrated.

DESCRIPTION OF SYMBOLS 1 Start standing hole 2 Supporting wall 3 Starting stand 4 Main pushing jack 5 Wellhead 6 Excavator 7 Excavating cutter 8 Wall surface 9 Water stop 10 Water stopping well 11 Flange part 12 Holding plate 13 Comb adjusting plate 14 Water stopping rubber 15, 15A Formwork 16 Shock absorbers 17 and 17A Main reinforcing bars 18 and 18A Distribution bars 19 Reinforcement joints 20 Ready-mix concrete 24 Wellhead support 25 Protective concrete 27 Concrete transfer surface 28 Manhole

Claims (3)

A water stopper fitted with a water stop rubber so that one end abuts along the wall surface around the opening edge of the wellhead and close to the outer peripheral surface of the excavator inserted into the wellhead along the periphery of the other end ,
The required number of main reinforcing bars arranged around the water stop,
A distribution force that is perpendicular to the main reinforcing bar and arranged at predetermined intervals, the tip is in contact with the wall surface around the opening edge of the wellhead, and the base end is the length to the other end of the water stop With streaks,
A reinforcing bar joint attached to the proximal end of the reinforcing bar;
Wellhead support that is integrally formed from concrete from the wall surface around the opening edge of the wellhead to the rebar joint in a state of being in close contact with the outer peripheral surface of the excavator so as to surround the waterstop, main rebar, distribution bar and rebar joint A wellhead propulsion structure for wellheads in propulsion work. The water stop propulsion structure for a wellhead in the propulsion work according to claim 1, further comprising a buffer body fixed to the wellhead support portion between the wellhead support portion and the outer peripheral surface of the excavator . The water stop propulsion structure for a wellhead in the propulsion work according to claim 1 or 2, wherein a lubricant is interposed between the buffer body and the outer peripheral surface of the excavator .

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