JP4549247B2 - Propulsion pipe start entrance, start entrance structure and start entrance water stop method - Google Patents

Description

  The present invention is a propulsion pipe used in a propulsion method in which a propulsion unit is propelled first, and a plurality of propulsion pipes are sequentially propelled from the starting pit of the propulsion pipe in order to construct an underground conduit. It is related with the entrance for starting, its structure, and its water stop construction method.

  As a tunnel construction method, a propulsion machine is propelled in the ground using a jack for propulsion installed in the shaft on the start side of the propulsion pipe, and then propulsion equipment is propelled while sequentially connecting multiple propulsion pipes. A propulsion method for constructing a middle conduit is known.

  In addition to the construction of relatively short sections such as tracks and road crossing roads such as underground sidewalks and waterworks and sewers, this construction method also uses multiple propulsion pipes as intermediate mountain stoppers between the start side and arrival side shafts. Is also applied to a so-called pipe roof construction method in which the inner portion is widened by excavating the inside (see, for example, Patent Documents 1, 2, and 3).

  In this construction method, at the start of propulsion, the earth retaining wall of the start-side vertical shaft is cut with a propulsion machine to form a starting hole for the propulsion pipe in the earth retaining wall, and the propulsion unit and then the propulsion pipe are propelled from the starting hole. In order to lay out the propulsion pipe more accurately, the propulsion pipe that has been laid can be pulled back once, and then propelled again and laid again in order to lay the propulsion pipe more accurately. Done.

  By the way, the start entrance of the propulsion pipe is attached with a start entrance so that earth and sand and groundwater do not jet into the shaft at high pressure from the gap between the start well and the propulsion unit and the propulsion pipe during and after construction. .

  2. Description of the Related Art Conventionally, this type of starting entrance is provided with an entrance pipe 23 having a diameter through which a propulsion unit 21 and a propulsion pipe 22 can be inserted inside a start shaft 20 as shown in FIG. It is configured by attaching a donut-shaped rubber plate packing 24 formed to have a diameter slightly smaller than the outer diameter of the propulsion unit 21 and the propulsion pipe 22 to the portion, and rubber when the propulsion unit 21 and the propulsion pipe 22 pass through the entrance pipe 23. The plate packing 24 was deformed and brought into close contact with the outer peripheral surfaces of the propulsion pipe 21 and the propulsion pipe 22, so that the water stopping of the start well 20 was ensured.

Patent No. 3011902 JP 2004-353377 A Japanese Examined Patent Publication No. 6-102955 Japanese Patent Publication No. 7-76507 Japanese Patent Laid-Open No. 7-81486

  However, since the rubber plate packing 24 may be bent and damaged particularly when the propulsion unit 21 and the propulsion pipe 22 are pulled back, it is necessary to perform various repair methods for preventing this. .

  Further, when a rigid pipe having a very small radius of curvature is used as the propulsion pipe 22, it is necessary to provide a large clearance between the entrance pipe 23 and the propulsion pipe 22, and the clearance is not constant in the circumferential direction. In the rubber plate packing 24, there is a possibility that the rubber plate packing 24 is easily reversed by receiving a high water pressure, and there is a problem that reliable water stopping cannot be performed.

  The present invention has been made in order to solve the above-described problems, and can cope with the reverse of the pulling back of the propulsion unit and the propulsion pipe, and provides a clearance between the starting well and the propulsion unit and the propulsion pipe. An object of the present invention is to provide a propulsion pipe start entrance, a start entrance entrance structure, and a start entrance water stop construction method that can be surely blocked and water can be reliably stopped at a start pit.

For startup entrance propulsion tube according to claim 1, wherein, in the starting entrance propulsion tube used for jacking method for constructing the underground pipe with a plurality of propulsion tube to propel sequential passage while later the propulsion unit, wherein An entrance pipe through which the propulsion unit and the propulsion pipe can be inserted, and a seal member made of a wire brush attached to the inner periphery of the entrance pipe in a ring shape. The entrance pipes are mutually connected in the axial direction of the entrance pipe. The seal member is composed of a plurality of short pipes connected to and disconnected from each other, and the seal member projects from the inner periphery of the short pipe so as to block between the entrance pipe and the propulsion unit and the propulsion pipe. It is characterized by this.

In particular, the present invention makes it possible to simplify the installation by making the entrance for starting the propulsion pipe into parts, thereby making it possible to save labor in the field construction, etc. The launch of the shield machine in the shield method is not limited to the propulsion method. It can also be used for wellheads. Furthermore, it can be used as a ground survey or a preliminary survey for tunnel excavation, etc., and can also be used as a water-stopping measure at the hole in the boring method.
Further, by making the entrance pipe and the seal member into finer parts, it is possible to provide an entrance pipe having water stop performance as required. For example, when it is desired to improve the water stop performance, an entrance pipe having a high water stop can be provided by connecting a number of short pipes each having a seal member. Further, in principle, the sealing member is attached to all the short pipes, but it is not always necessary, and may be attached to some of them.

  In this case, a ready-made steel pipe can be used for the entrance pipe, and one or several steel wire brushes can be used as the seal member, and the seal member can be an entrance pipe. By providing a plurality of stages at predetermined intervals in the axial direction, the water stoppage can be enhanced.

  The start entrance for the propulsion pipe according to claim 2 is the entrance for start of the propulsion pipe according to claim 1, wherein the seal member is placed at least on the back side (opposite to the propulsion direction of the propulsion pipe) before the deformation. A spring member for restoring the state is attached.

  In particular, the present invention is provided in the case where the seal member is deformed to the back side by pulling back the propulsion unit and the propulsion pipe, and even if the seal member is deformed, the seal member easily returns to the original shape by the action of the spring member. Therefore, there is no particular problem when the propulsion pipe is propelled again.

  In this case, a leaf spring can be used as the spring member, and the spring member only needs to be attached to at least the back side of the seal member, but it can also be attached to the surface side of the seal member (the propulsion direction side of the propulsion pipe). For example, it is possible to prepare for deformation in the propulsion direction.

    The propulsion pipe start entrance according to claim 3 is the propulsion pipe start entrance according to claim 1 or 2, wherein a back-up material that prevents the seal member from reversing to the back side is provided on the back side of the seal member. It is characterized by being attached.

  In particular, the present invention provides for a case where the seal member is greatly deformed to the back side by pulling back the propulsion unit and the propulsion pipe and is likely to be reversed to the back side. The reversal of the seal member can be reliably prevented. In this case, a steel material or a hard resin material can be used as the backup material, and it is only necessary to overlap and attach the spring member on the back side of the seal member.

  The propulsion pipe start entrance according to claim 4 is the propulsion pipe start entrance according to claim 3, wherein the backup material is formed so as to be able to adjust the deformation amount of the seal member to the back side. It is a feature.

  In particular, the present invention provides for a case where the clearance between the propulsion pipe and the entrance pipe is not constant, such as when a rigid pipe having a very small radius of curvature is used as the propulsion pipe. The amount of deformation of the seal member can be adjusted by appropriately setting the inclination of the backup material according to the size of the clearance.

  For example, in the portion where the clearance between the propulsion pipe and the entrance pipe is large, the inclination of the backup material may be increased so that the seal member can be greatly deformed, and in the portion where the clearance is small, the inclination of the backup material may be reduced. Note that the backup material in this case can be installed at a predetermined inclination, for example, by using a hinge structure that can be fixed at an arbitrary angle with respect to a fixed portion fixed to the entrance pipe.

The structure of the entrance for starting the propulsion pipe according to claim 5 is the structure of the entrance for starting used in the propulsion method for constructing the underground pipe line by propelling the propulsion unit while sequentially propagating a plurality of propulsion pipes . It consists with the propulsion device and possibly promote tube insertion entrance pipe attached to the starting wellhead of the propulsion tube, the seal member comprising a wire brush attached to the inner circumference of the entrance pipe in a ring shape, wherein the entrance The pipe is composed of a plurality of short pipes that are connected to and disconnected from each other in the axial direction of the entrance pipe, and the seal member is formed on the inner periphery of the short pipe with the entrance pipe, the propulsion unit, and the propulsion pipe. It is characterized by being projected so as to close the gap.

The water stopping method for the entrance for starting the propulsion pipe according to claim 6 is the stopping of the entrance for starting used in the propulsion method for constructing an underground pipe line by propelling a plurality of propulsion pipes sequentially after the propulsion unit. In the water construction method, the propulsion unit and the propulsion pipe were constituted by an entrance pipe composed of a plurality of short pipes, and a plurality of seal members composed of wire brushes attached to the inner periphery of the short pipe in a ring shape. Attach a starting entrance to the starting pit of the propulsion pipe, and after propelling the propulsion pipe at the end from the starting pit, leave at least a short pipe fixed to the starting pit and remove the other short pipe It is characterized by.

  In the present invention, the water stop treatment can be surely performed without waste according to the amount of groundwater ejected from the starting pit, and when a large amount of groundwater is ejected, a large number of short pipes provided with a seal member are connected in series. Therefore, the water stoppage can be increased.

  In the present invention, a starting entrance consisting of an entrance pipe into which a propulsion unit and a propelling pipe can be inserted and a seal member made of a wire brush attached in a ring shape around the inner periphery of the entrance pipe is provided at the starting well of the propulsion pipe. By being attached, it is possible to prevent the groundwater and muddy water from being ejected and to reliably stop the entrance for starting.

  In addition, since the seal member is formed from a wire brush that is not easily deformed, the propelling pipe can be propelled very efficiently and smoothly without being easily deformed by pulling back the propelling pipe. be able to.

  1 (a), (b), and (c) show a starting entrance attached to the starting shaft of the starting side shaft of the propulsion pipe and the structure thereof, and in the figure, starting to the earth retaining wall 1 of the starting side shaft A wellhead 2 is formed, a cylindrical entrance pipe 3 is horizontally attached to the inside of the start well 2, and a seal member 4 is attached to the inner periphery of the entrance pipe 3 in a ring shape.

  The entrance pipe 3 is formed of a steel pipe having a slightly larger diameter than the propulsion unit 5 and the propulsion pipe 6 and is detachably attached to the peripheral portion of the wellhead 2 of the earth retaining wall 1 by an anchor bolt or the like.

  The sealing member 4 is formed of a steel wire brush 4a, and the wire brush 4a is superposed on one or several sheets depending on the size of the groundwater pressure acting on the start well 2 and the inner periphery of the tail portion of the entrance pipe 3 And is extended in a fin shape in the propulsion direction of the propulsion unit 5 and the propulsion pipe 6. Further, a grease-like waterproof material is applied to the surface of the wire brush 4a.

  In such a configuration, while the propulsion unit 5 and the propulsion pipe 6 propel the interior of the entrance pipe 3, the clearance (gap) a between the propulsion unit 5 and the propulsion pipe 6 and the entrance pipe 3 is blocked by the seal member 4. Thus, groundwater or the like does not spout from the gap 5 between the propulsion unit 5 and the propulsion pipe 6 and the entrance pipe 3 into the shaft.

  Moreover, since the seal member 4 is formed of a steel wire brush 4a having a certain rigidity and is formed by overlapping several wire brushes 4a, it may be easily deformed by the water pressure of groundwater. Therefore, the sealing member 4 is not reversed by the groundwater pressure and the water stoppage is not impaired.

  2 (a), 2 (b), and 2 (c) show modified examples of the present invention. In the case of FIG. 2 (a), leaf springs 7 are attached to both sides of the seal member 4 as spring members. A restoring force is applied to the seal member 4 using the force to return to the state before the deformation.

  According to the present invention, the seal member 4 is deformed when the propulsion unit 5 and the propulsion pipe 6 are pulled back during the construction, for example, when the propulsion pipe 6 is laid again and the propulsion pipe 6 is to be laid more accurately. Even so, the seal member 4 is simply restored to its original shape by the action of the leaf spring 7, so that the original water stop function is not impaired.

  In the case of FIG. 2B, the leaf springs 7 are attached to both sides of the seal member 4, and the backup material 8 made of steel or hard resin material is attached to one side thereof.

  According to the present invention, even when an excessive force acts on the seal member 4 when the propulsion unit 5 and the propulsion pipe 6 are temporarily pulled back during the construction, the seal member 4 is greatly increased by the action of the backup material 8. There will be no deformation and inversion, and the original water stop function will not be impaired.

  In the case of FIG. 2 (c), leaf springs 7 are attached to both sides of the seal member 4, a backup material 8 is attached to one side surface thereof, and the backup portion 8 is fixed to the entran pipe 3. By using a hinge structure that can be fixed at an arbitrary angle with respect to 8a, the deformation angle of the seal member 4 can be freely adjusted.

  According to the present invention, even when the clearance between the propulsion unit 5 and the propulsion pipe 6 and the entrance pipe 3 is not constant in the circumferential direction, the deformation amount of the seal member 4 can be adjusted according to the size. In particular, it is suitable when a rigid tube having a relatively small radius of curvature is used as the propelling tube 6.

  3 (a), 3 (b), and 3 (c) also show a modification of the present invention. For example, in the case of FIG. 3 (a), the seal member 4 has a plurality of stages at predetermined intervals in the axial direction of the entrance pipe 3. Is attached.

  3 (b) and 3 (c), the entrance pipe 3 is formed by connecting a plurality of short pipes 3a and 3b in the axial direction so as to be connected to and disconnected from each other. Seal members 4a and 4b are attached to the inner circumferences of the short pipes 3a and 3b, respectively.

  According to the invention of FIG. 3A, the plurality of seal members 4 are attached in a plurality of stages at predetermined intervals in the axial direction of the entrance pipe 3, so that the water stoppage of the start well 2 can be significantly increased. .

  In particular, according to the invention of FIGS. 3 (b) and 3 (c), it is necessary to connect as many short pipes 3a and 3b to which the seal member 4 is attached as necessary according to the amount of groundwater flowing out from the starting wellhead 2. Water can be stopped.

  In addition, after laying all the propulsion pipes 6, when stopping the start pit 2, the propulsion pipe at the rearmost end is propelled from the start pit 2, and only the short pipe 3 a fixed to the start pit 2 is left. By removing the other short pipe 3b, the water stop process of the start pit 2 can be completed very compactly.

  4 (a) and 4 (b), the shield tunnels 9 and 10 dug in parallel by the so-called pipe roof construction method are widened to construct a large-section tunnel in which the shield tunnels 9 and 10 are continuous. A construction method is shown, and a plurality of propulsion pipes 6 are laid in an arch shape between the shield tunnels 9 and 10 as a mountain retaining work, sequentially propelled from the shield tunnel 9 side to the shield tunnel 10 side.

  In this case, by using the starting entrance of the present invention for the segment 11 attached to the shield tunnel 9 on the arrival side at the position where the propulsion unit 5 and the propulsion pipe 6 start, It can be done reliably.

  The portion of the segment 11 through which the propulsion unit 5 penetrates is formed of a material such as a fiber reinforced concrete that can be cut so that the propulsion unit 5 can cut and propel it.

  The departure from the present application can cope with pulling back of the propulsion unit and the propulsion pipe, and can reliably close the gap between the start pit and the propulsion unit and the propulsion pipe to reliably stop the start pit.

The structure of the starting entrance and the starting entrance of the propulsion pipe attached to the starting pit of the retaining wall is shown, (a) is a longitudinal sectional view thereof, (b) is a sectional view taken along the line II in (a), ( c) is an enlarged view of the portion B in (a). (A), (b), (c) is the B section enlarged view in Drawing 1 (a) showing other examples of the present invention. The structure of the starting entrance and the starting entrance attached to the starting pit of the retaining wall is shown, (a) is a longitudinal sectional view thereof, (b) is a longitudinal sectional view of the starting entrance entrance, and (c) is a starting entrance. FIG. (A) is a longitudinal cross-sectional view which shows the propulsion pipe laid between the shield tunnels dug in parallel, (b) is an expanded sectional view of the part C in (a). It is a longitudinal cross-sectional view which shows the structure of the conventional entrance for a start.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Earth retaining wall of start side shaft 2 Start port 3 Entrance pipe 4 Seal member 4a Wire brush 5 Propulsion machine 6 Propulsion pipe 7 Leaf spring (spring member)
8 Backup material 9 Shield tunnel 10 Shield tunnel 11 Segment

Claims (6)

In the starting entrance propulsion tube used for jacking method of propulsion device a plurality of propulsion tube to propel sequential passage while later the building the underground pipe, the said propulsion unit and propulsion tube and can be inserted entrance pipe, A plurality of short pipes connected to and disconnected from each other in the axial direction of the entrance pipe. The seal pipe comprises a wire brush attached in a ring shape on the inner periphery of the entrance pipe. The propulsion pipe start entrance is characterized in that the seal member is provided on the inner periphery of the short pipe so as to project between the entrance pipe and the propulsion unit and the propulsion pipe.   2. The propulsion pipe start entrance according to claim 1, wherein a spring member for restoring the seal member to a state before deformation is attached to at least the back side of the seal member.   The propulsion pipe starting entrance according to claim 1 or 2, wherein a back-up material that prevents the seal member from being reversed to the back side is attached to the back side of the seal member.   4. The propulsion pipe starting entrance according to claim 3, wherein the backup material is formed so as to adjust a deformation amount of the seal member toward the back side. In the structure of a starting entrance used in a propulsion construction method in which a plurality of propulsion pipes are sequentially connected after a propulsion unit to construct an underground conduit , the propulsion unit and the propulsion attached to the start pit of the propulsion pipe It is composed of an entrance pipe through which a pipe can be inserted and a seal member made of a wire brush attached in a ring shape to the inner periphery of the entrance pipe. The entrance pipes can be connected to and disconnected from each other in the axial direction of the entrance pipe. A plurality of short pipes connected to each other, and the seal member protrudes from an inner periphery of the short pipe so as to block between the entrance pipe and the propulsion unit and the propulsion pipe. The structure of the entrance for starting the propulsion pipe.   In the water stopping method for the entrance entrance used for the propulsion method of building an underground conduit by sequentially propelling a plurality of propulsion pipes after the propulsion unit, the propulsion unit and the propulsion pipe can be inserted into a plurality of short lines. A starting entrance composed of an entrance pipe made of a pipe and a plurality of seal members made of a wire brush attached in a ring shape to the inner periphery of the short pipe is attached to the start well of the propulsion pipe, and the start well After the propulsion pipe at the last end is propelled, at least the short pipe fixed to the start pit is left, and the other short pipe is removed, and the water stop construction method for the start entrance of the propulsion pipe is characterized in that:

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