JP4081037B2 - Propulsion and shield combination method - Google Patents

Description

  The present invention relates to a propulsion and shield combined construction method, and more particularly, is used for construction of sewerage in an urban area, and a propulsion pipe is laid by propelling a shield machine and a propulsion pipe in the ground without excavating the ground. The present invention relates to a propulsion method and a shield combined method that are implemented in combination with a conventional propulsion method and a shield method in which a steel segment is assembled and covered.

  The propulsion and shield combined construction method can combine the propulsion construction method and the shield construction method, both well known as tunnel construction techniques, to make up for the disadvantages of both construction methods and to exhibit the advantages effectively. Specifically, the propulsion method is applied up to a certain distance from the shaft where construction starts, and the shield method is applied thereafter.

  In the propulsion method, propulsive force is applied to the end of the propulsion pipe row with a push jack to propel the entire propulsion pipe row and shield machine into the ground. For this reason, the longer the propelling tube row, the greater the propulsive force required. In order to generate this large propulsive force, equipment such as a push jack becomes large. Further, when a large propulsive force is applied to the connection portion of the propulsion pipe, the propulsion pipe, for example, a fume pipe, may cause damage or deformation. Therefore, with the propulsion method, it is difficult to carry out the long-distance propulsion work at once. If shafts are arranged at short intervals in order to shorten the propulsion distance, the influence on ground traffic and the like due to excavation increases, and the construction time and construction cost also increase.

On the other hand, in the shield method, after assembling concrete segments inside the shield machine, the segment cylinder is constructed, and then the segment cylinder is pushed backward with the excavation jack provided in the shield machine, and the reaction force from the extruded segment cylinder is used. Advance the shield machine. Therefore, even if the construction distance becomes long, it is sufficient that the excavation jack has an ability to advance the shield excavator, and the force applied to the segment cylinder does not become excessive. However, since the segment tube is formed, the construction efficiency is inferior compared to the propulsion method in which a propulsion pipe manufactured in advance is connected at the end.
Therefore, the tunnel construction over a long distance can be efficiently performed by applying a propulsion method that can be efficiently constructed at the start of construction, and switching to the shield method when the construction distance becomes long and the propulsion method becomes difficult. There is an advantage of doing so.

An example of the construction method is JP-A-7-54577.
In this publication, as shown in FIG. 9, an excavation part c is provided at the front end of the cylindrical outer shell base b, and a tail part d for assembling the segment s into a ring body (segment cylinder) r at the rear end. In the excavation hole formed by the shield machine a between the shield machine a provided with the forward jack f for advance and the forward position started from the shield machine a, the start position is An excavation hole is formed by propelling and embedding the fume pipe p with the advancement of the shield machine a using the provided push jack (not shown), and the excavation by the shield machine a following the excavation hole. The ring body r assembled by lifting the segment s by the erector e in the space in the tail portion d generated by the forward movement accompanying the forward movement of the digging jack f for the forward movement. By pushing out from the shield machine a, the ring body r forms a continuous shield hole, and the shield machine a is arranged in front of the tail part d and integrated with the ring body r assembled with the segment s. It has a configuration in which a connecting ring g that is formed in a cylindrical shape and is coupled to the fume tube p and the ring body r is previously stored. This has the above-described advantages (see Patent Document 1).

On the other hand, there is also a type in which an inner pipe is formed by inserting a gap in a segment pipe line by a steel segment to form an inner pipe line, and a lightweight mortar is filled in the gap to lay a shield pipe line (Patent Document 2). reference).
JP 07-54577 A Japanese Patent Laid-Open No. 08-189050

However, in the technique of Patent Document 1, the segment s is assembled in the tail portion d, and the inner diameter of the assembled ring body r is the same as the inner diameter of the fume tube p. Become. For this reason, since the weight of the segment s becomes heavy and the handling thereof becomes troublesome, the number of divisions of the segment s (in the circumferential direction) increases, and the assembling work becomes complicated and workability is lowered.
Further, a connecting pipe g made of a steel pipe is prepared separately, and the mounting work for integrally connecting the ring body r and the front end fume pipe p with the stud bolt by the flanges at the front and rear ends of the connecting ring g is complicated. Become.

  Moreover, even if it can employ | adopt the shield pipeline in the said patent document 2 instead of the shield pipeline of the said patent document 1, joining of a propulsion pipeline and the said interior pipe of the said shield pipeline is both pipe lines Since it becomes a system which couple | bonds with a planting bolt via the connection ring g arrange | positioned between, the centering operation | work of the said both pipe lines is not easy.

  The present invention facilitates construction by reducing the number of segment divisions as much as possible, and also facilitates the joining and centering operations of the two pipe lines, and further maintains the waterproof performance over a long period of time. Is an issue.

  In order to achieve the above object, the present invention includes a propulsion process in which a propulsion pipe connected from a start shaft to the rear of a shield machine is propelled in the ground and the propulsion pipe is laid, and the propulsion process is followed. A shield that assembles a segment tube made of steel segments in the assembly space inside the shield machine and uses the segment tube as a reaction member to propel the shield machine into the ground and lay the shield tube up to the reaching vertical hole. The propulsion and shield combined construction method comprises the steps of: the propulsion step is provided with a thrust receiving ring at the rear end of the assembly space of the shield machine, and the propulsion pipe is fitted to the rear end of the thrust receiving ring. And a step of applying a propulsive force from the propulsion pipe to the shield machine through the thrust receiving ring, and the shielding step includes the step of connecting the head segment tube to the propulsion pipe A step of connecting, a step of laying an interior pipe by pushing a predetermined gap into the segment cylinder from the reaching vertical hole, and a step of connecting the leading interior pipe to the propulsion pipe, and filling the gap with a filler. And adopting a configuration comprising:

  As described above, the propulsion step is provided with a thrust receiving ring at the rear end of the assembly space of the steel segment included in the shield machine, and the propulsion pipe is fitted and brought into contact with the rear end of the thrust receiving ring, By applying a propulsive force from the propulsion pipe to the shield machine through the thrust receiving ring, no connection member is used when connecting the steel segment and the leading propulsion pipe, so that the connection is easy.

  Moreover, the centering is easy by connecting the insertion opening of the top interior pipe to the notch recess of the top propulsion pipe via a water stop material.

In addition, since the nut mounting chamber with the inner peripheral side opened is formed at the front end portion of the leading propulsion pipe, the nut mounting chamber has a small depth in the radial direction of the mounting chamber due to the notch recess, and the segment cylinder and the top Can be easily connected to the propulsion pipe.
Further, since the inner peripheral side of the nut mounting chamber is closed by the interior pipe (GRC pipe), the mortar filling operation into the mounting chamber is not necessary.

As described above, the present invention can further improve the shield construction.
In addition, when connecting the steel segment and the leading propulsion pipe, there is nothing to connect through any member, so the connection is easy, and the nut mounting chamber has a short depth in the radial direction due to the cut recess, so It can be done easily.
Further, since the insertion opening of the interior pipe is fitted and connected to the cut recess of the leading propelling pipe, the centering is easy.

  The embodiment of the present invention will be described with reference to FIGS. 1 to 8. Reference numeral 1 is a start shaft, 2 is a reach shaft, 3 is a main push jack, 5 is a shield machine having excavation and propulsion functions, A rotatable cutter 7 is attached to the tip of the cylinder 6 and is driven by a rotary driving machine 8. A segment assembly space 9 for assembling a steel segment, which will be described later, is provided in the tail portion 6a at the rear end of the steel outer cylinder 6. In the vicinity of the assembly space 9, an erector 10 for installing the steel segment at a predetermined assembly position is installed. Reference numeral 11 denotes an excavation jack disposed between the segment assembly space 9 and the receiving member 12.

A thrust receiving ring 13 is detachably fixed to the rear end of the segment assembly space 9 of the steel outer cylinder 6 and is fixed by a fixing bolt 14. The end (rear part) side from the thrust receiving ring 13 position of the steel outer cylinder 6 is defined as a receiving port 6b. The insertion port 21 of the leading propulsion pipe 20 is connected to the receptacle 6b and brought into contact with the thrust receiving ring 13, and the propulsive force is transmitted from the propulsion pipe 20 to the shield machine 5 through the thrust receiving ring 13.
The insertion port 21 of the leading propulsion pipe 20 is formed by a recessed step 22, and a water stop rubber 29 is attached to the circumferential groove 22 a of the step 22. A normal propulsion pipe 20 that is substantially the same as the conventional one is sequentially connected to the rear of the leading propulsion pipe 20. The connection between the rear end portion of the leading propulsion pipe 20 and the subsequent propulsion pipe 20 is similar to a normal propulsion pipe connection. (Not shown).

Reference numeral 23 denotes a nut mounting chamber provided on the inner surface side of the recessed step portion 22 of the insertion opening 21, which is formed by the side plate 25 embedded at an appropriate interval from the end plate 24, and the reinforcing rib 26 at an appropriate interval in the circumferential direction therebetween. Is disposed. Reference numeral 27 denotes a bolt hole.
Reference numeral 28 denotes a notch recess formed by cutting out a part of the inside of the nut mounting chamber 23 of the leading propulsion pipe 20 and an end of the leading propulsion pipe 20.

  A steel segment 30 has a box shape having end flanges 31 and side flanges 32 on four sides of a curved plate formed on a predetermined inner surface. Bolt holes 33 are provided in the end flanges 31. Bolt holes (not shown) are also formed in the side flange 32.

Reference numeral 40 denotes a leading interior pipe made of, for example, alkali-resistant glass fiber reinforced cement (GRC), which has an insertion port 41 formed by a concave groove 42 at one end and a collar-shaped receiving port 43 at the other end. is there. Reference numeral 44 denotes a mortar inlet, and 45 is a waterproof rubber mounted in the concave circumferential groove 42.
46 is a following interior pipe, which is also made of the above-mentioned GRC, and has an insertion port 47 formed by a recessed step at one end and a collar-shaped receiving port 48 at the other end. Reference numeral 49 denotes a waterproof rubber attached to the recessed step.

Next, the propulsion and shielding method of the present invention will be described.
First, the shield machine 5 is positioned at the start port 1a in the start shaft 1, and the rod 3a of the main jack 3 interposed between the shield machine 5 and the rear wall of the start shaft 1 is moved forward to shield. At the same time as the machine 5 is pushed in, the shield machine 5 is activated to excavate the ground to form an excavation hole. After the shield machine 5 is moved forward by a predetermined amount, the rod 3a of the main push jack 3 is once retracted, and the tip of the propulsion pipe 20 is fitted into the rear part of the steel outer cylinder 6 of the shield machine 5 to receive thrust. The ring 13 is brought into contact. The rear end portion of the propulsion pipe 20 is positioned on the front surface of the rod 3a via the pressing plate 4, and the rod 3a is advanced to push the propulsion pipe 20 and at the same time, the shield machine 5 is activated and propelled. Then, while a succeeding propulsion pipe 20 is connected to the propulsion pipe 20 on the front side, the propulsion is propelled a predetermined distance toward the reaching shaft 2.
That is, the propulsion pipe 20 is connected to the receiving port 6b at the rear end of the segment assembly space 9 formed in the steel outer cylinder 6 of the shield machine 5, and the shield machine is connected from the propulsion pipe 20 through the thrust receiving ring 13. A driving force is added to 5.
Thus, the propulsion pipe having a predetermined length is formed by the reaction force of the main jack 3 acting on the rear wall provided with the shield machine 5 and the propulsion pipe 20 in the start shaft 1 and the excavation action of the shield machine 5. Formed (see FIGS. 1, 2 and 7).

Next, when the propulsion by the propulsion pipe 20 becomes more difficult or when a hypercurved curve is required at the tip of the propulsion pipe, the segment pipe is constructed by the shield method. That is, after the thrust receiving ring 13 is removed from the steel outer cylinder 6, the segments are assembled in a ring shape using the steel segments 30 that are manufactured by being divided in the segment assembly space 9 of the steel outer cylinder 6 in the circumferential direction. A cylinder 35 is formed.
The end plate 24 of the insertion opening 21 of the propulsion pipe 20 and the end flange 31 on one side of the steel segment 30 are connected by a bolt and a nut 34 with a water stop material 36 interposed therebetween. On the other hand, when the excavation jack 11 is attached between the end flange 31 on the other side and the receiving member 12 and the rod 11a of the excavation jack 11 is operated and the shield excavation machine 5 is started, the reaction from the segment cylinder 35 occurs. With force (as a reaction force member), the shield mowing machine 5 moves forward in the ground together with the steel outer cylinder 6. By advancement of the shield machine 5, a segment assembly space 9 is formed in the steel outer cylinder 6, and a segment cylinder 35 is formed by assembling a steel segment 30 in the space 9. By repeating this, a continuous segment cylinder 35 is formed. It is formed.

  The segment cylinder 35 is pushed backward by the extension of the excavating jack 11, and at the same time, the shield excavator 5 moves forward to perform excavation. The reaction force support during the forward movement of the shield machine 5 at this time is performed by the friction force between the segment cylinder 35 and the ground, and the propulsion pipe 20 and the ground. In this shield method, the shield machine 5 is extended every time the assembly of the steel segments 30 for each ring is completed, and a segment pipe line is laid between the shield machine 5 and the propulsion pipe 20 (FIG. 2). And 3). (In addition, every time the ring body is assembled, the backfill material is injected into the gap with the ground.)

  In the case of the sharp curve, the steel outer cylinder 6 is divided into two in the longitudinal direction, and a plurality of hydraulic cylinders are arranged on both inner cylinder inner surfaces and straddling both outer cylinders, and are fitted and connected. The advance and retreat amount of the hydraulic cylinder is adjusted so that an angle is provided between the outer cylinders.

  When the laying of the segment pipe is completed, the shield machine 5 is removed, and secondary lining in the segment pipe is performed. This secondary lining is a push-in jack installed between the GRC pipe 40 and the rear wall of the reaching shaft 2 by positioning the GRC pipe 40 at the reaching port 2a in the segment pipe line from the reaching port 2a on the reaching shaft 2 side. The 50 rods 50a are advanced and pushed through the pressing plate 51 with a gap S therebetween. After the GRC tube 40 is moved forward by a predetermined amount, the rod 50a is once moved backward. The distal end portion (insertion opening) 47 of the subsequent GRC tube 46 is watertightly connected to the receiving port 43 of the GRC tube 40 through a water stop rubber 49, and the rear end portion thereof is positioned on the front surface of the rod 50a. The subsequent interior pipe 46 is pushed in. And pushing and connection are repeated in this way. When the insertion opening 41 of the leading GRC pipe 40 is fitted into the cut recess 28 of the propulsion pipe 20, the pushing of the GRC pipes 40 and 46 is completed, and the GRC pipe line is formed (FIGS. 4, 6 and 8). reference).

  A predetermined gap S between the inner diameter of the segment pipe and the outer diameter of the GRC pipe is filled with a filler, for example, air mortar 53, from the inlet 44 of the GRC pipe 40 to form a mortar packed layer (FIG. 5). reference).

  As described above, the shield pipe is formed by integrating the segment pipe on the outside, the mortar packed bed on the middle, and the GRC pipe on the inside.

The connection between the GRC pipes 40 and 46 and the propulsion pipe 20 is made by fitting the insertion port 41 of the GRC pipe 40 into the cut recess (inner peripheral side receiving port) 28 of the propulsion pipe 20 via the water stop material 45. . Thus, since the inside of the shield pipe line is formed by the GRC pipe 40, the construction time is significantly reduced as compared with the finishing process by the secondary lining using the conventional formwork.
Moreover, by connecting the GRC pipes 40 and 46 with the water stop rubber 49, the water stop is improved and the operation is also easy.

  The cylindrical outer diameter of the segment cylinder 35 is approximately the same as that of the propulsion pipe 20. The inner diameters of the GRC pipes 40 and 46 are substantially the same as that of the propulsion pipe 20, and the outer diameter is smaller than the inner diameter of the cylinder assembled by the steel segment cylinder 35.

Partial enlarged sectional view of a propulsion state according to an embodiment of the present invention Partial enlarged sectional view after completion of propulsion according to an embodiment of the present invention The partial expanded sectional view which shows the excavation state of the steel segment which concerns on embodiment of this invention The partial expanded sectional view which shows the pushing state of the interior pipe which concerns on embodiment of this invention The partial expanded sectional view which shows the state after completion | finish of the shield which concerns on embodiment of this invention Partial enlarged sectional view of FIG. Sectional drawing which shows the excavation state of the steel segment which concerns on embodiment of this invention Sectional drawing which shows the pushing state of the steel segment of the interior pipe which concerns on embodiment of this invention Schematic sectional view of the prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Start shaft 1a Start port 2 Arrival shaft 2a Arrival port 3 Former push jack 3a Rod 4 Pressing plate 5 Shield engraving machine 6 Steel outer cylinder 6a Tail part 6b Receiving port 7 Cutter 8 Rotating drive 9 Segment assembly space 10 Elector 11 Excavation jack 11a Rod 12 Receiving member 13 Thrust receiving ring 14 Fixing bolt 20 Leading propulsion tube 21 Insert port 22 Recessed stepped portion 22a Circumferential groove 23 Nut mounting chamber 24 End plate 25 Side plate 26 Reinforcement rib 27 Bolt hole 28 Notch recess 29 Water stop rubber 30 Steel segment 31 End flange 32 Side flange 33 Bolt hole 34 Bolt and nut 35 Segment tube 36 Water stop material 40 Leading interior pipe (GRC pipe)
41 Insertion opening 42 Circumferential groove 43 Reception opening 44 Air mortar injection opening 45 Water stop material 46 Subsequent interior pipe 47 Insertion opening 48 Reception opening 49 Water stop rubber 50 Push-in jack 51 Press plate 53 Air mortar

Claims (3)

Following the propulsion process in which the propulsion pipe 20 is laid in the ground by propelling the propulsion pipe 20 connected to the back of the shield excavation machine 5 from the start shaft 1 and the shield excavation machine 5, A segment cylinder 35 made of a steel segment 30 is assembled in the assembly space 9 in the shield machine 5 and the shield cylinder 5 is propelled into the ground by using the segment cylinder 35 as a reaction member so that the shield cylinder 35 reaches a vertical hole. In the propulsion and shield combined construction method, which consists of a shield process that lays up to 2
In the propulsion step, a thrust receiving ring 13 is provided at the rear end of the assembly space 9 of the shield machine 5, and the propulsion pipe 20 is fitted and brought into contact with the rear end of the thrust receiving ring 13. A step of applying a propulsive force to the shield machine 5 via the thrust receiving ring 13; a step of connecting the leading segment cylinder 35 to the propulsion pipe 20; A step of pushing and laying the inner pipe 40 with a predetermined gap S in the cylinder 35 and connecting the leading inner pipe 40 to the propulsion pipe 20; and a step of filling the gap S with the filler 53; A propulsion and shield combined construction method characterized by   The propulsion and shield combined construction method according to claim 1, wherein the insertion opening 41 of the leading inner pipe 40 is connected to the cut recess 28 of the leading propulsion pipe 20 via a water stop material 45.   The propulsion and shield combined construction method according to claim 1 or 2, wherein a nut mounting chamber (23) whose inner peripheral side is open is formed at a front end portion of the leading propulsion pipe (20).

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