JP3634715B2 - Middle push pipe for propulsion method of power cave - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intermediate push pipe used when a power cave is constructed by a propulsion method.
[0002]
[Prior art]
When constructing a power cave, the same propulsion method is used as when constructing sewers and other underground passages. The propulsion method is a method in which a propelling pipe is sequentially added to the rear end of the excavator and pushed forward by a main pushing device. A general propulsion pipe used for the construction method is a concrete pipe in which one end of a concrete pipe is integrally provided with a receiving collar made of steel plate and the other end is similarly provided with a steel pipe insertion ring.
[0003]
When a single-core power cable is laid in a cave constructed with such a propulsion pipe, the magnetic flux leaking from the power cable changes its size while passing through the steel collar and ring described above, resulting in hysteresis loss. There is a problem that causes iron loss such as eddy current loss and power loss.
[0004]
The applicants have already filed patent applications for the propulsion pipes with the above-mentioned measures to prevent iron loss (Japanese Patent Application No. 10-157869). This is a configuration in which a notch extending over the entire length is provided and a non-magnetic stainless steel member is integrated in the notch.
[0005]
When the above-mentioned propulsion pipes for preventing iron loss are added sequentially, the non-magnetic stainless steel members of both the front and rear propulsion pipes are fitted inside and outside of the fitting collar and insertion ring. It is added while maintaining the overlapping positional relationship.
[0006]
On the other hand, when the propulsion distance by the above propulsion method is increased or when propelling a sharp curve, the propulsive force of the main pusher device is increased depending on the situation, but if the propulsive force becomes excessive, the propulsion pipe There is a risk of exceeding the allowable load. In such a case, an intermediate pusher tube is interposed in the middle of the propelling tube at an appropriate distance interval, and an intermediate pusher device is installed in the intermediate pusher tube portion, so that the propulsive force is A method of reducing the load acting on the propulsion pipe by dividing the intermediate pusher into the intermediate pressing device is used.
[0007]
The intermediate pusher tube is composed of a steel intermediate pusher outer tube called an intermediate pusher S tube and a steel intermediate pusher inner tube called an intermediate pusher T tube, and a rear end portion of the intermediate pusher outer tube. The front end portion of the inner pusher inner tube is fitted to the inner pusher, and an intermediate pusher device including a plurality of jacks is interposed therebetween.
[0008]
After the completion of the construction, the above-mentioned intermediate pushing device is removed, but the intermediate pushing tube is not removed, and constitutes a part of the power path. For this reason, there is a possibility that iron loss may occur in the portion of the intermediate push pipe for the same reason as in the propulsion pipe. For this reason, the non-magnetic stainless steel member as described above is also interposed in the middle pusher outer tube and the middle pusher inner tube of the intermediate pusher tube, and the nonmagnetic stainless steel members of both pipes are fitted in a positional relationship overlapping in the inner and outer directions. It is desirable to have a matching structure.
[0009]
[Problems to be solved by the invention]
When constructing a propulsion method using the above intermediate pusher and intermediate pusher, when the main pusher is driven, the propulsive force is applied to the rear end of the intermediate pusher and the inner pusher inner pipe is When the intermediate pusher is driven against the outer tube and the intermediate pusher is driven, the intermediate pusher inner tube supports the reaction force and the intermediate pusher outer tube is pushed forward.
[0010]
While the above drive is repeated, the intermediate pusher outer tube and the intermediate pusher inner tube may rotate in the circumferential direction relatively. When such rotation occurs, the positional relationship between the two non-magnetic stainless steel members is shifted, so that both non-magnetic stainless steel members are mutually short-circuited by the other steel member and pass magnetic flux, resulting in iron loss. The problem arises.
[0011]
Then, this invention makes it a subject to prevent the iron loss reliably by preventing the relative rotation of the inner pushing outer tube and the inner pushing inner tube during the construction of the propulsion method.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides an intermediate pusher tube for a power road propulsion method comprising a combination of an intermediate pusher outer tube and an inner pusher tube fitted from the rear to the inner diameter side. The annular metal member constituting the inner push outer tube and the inner push inner tube is divided into a non-circular steel member provided with a notch in a part of the circumference, and a non-integrated intermediate member in the notch portion. The intermediate pusher outer tube and the inner pusher inner tube are provided with a restricting means for restricting the positional relationship between the inner pusher tube and the inner pusher inner tube so that the nonmagnetic metal members of the inner pusher tube and the inner pusher inner tube overlap each other. The configuration was provided.
[0013]
When the intermediately pressed outer tube and the intermediately pressed inner tube are fitted to each other, the intermediately pressed tube having the above configuration prevents the passage of magnetic flux while maintaining the positional relationship in which both nonmagnetic metal members overlap each other. Moreover, as a result of the relative rotation in the circumferential direction being prevented by the action of both regulating means, the non-magnetic metal member is prevented from being short-circuited by the other steel member.
[0014]
The restricting means includes a restricting convex portion provided in the intermediate pusher outer tube and a restricting concave portion provided in the intermediate pusher inner tube, and the restricting convex portion and the restricting concave portion are connected to the intermediate pusher outer tube. It is possible to adopt a combined configuration so that it can be freely fitted and removed in the length direction of the inner push inner tube.
[0015]
In addition, the restricting convex portion is configured by a restricting rod that protrudes rearward from the inner collar rear surface of the inner diameter surface of the intermediate outer tube and that is provided at a predetermined interval with the inner diameter surface. The restriction recess may be constituted by a guide having a parallel opposing surface that is provided on the inner diameter surface of the inner pusher tube and receives the restriction rod.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0017]
As shown in FIG. 1, the intermediate pusher tube of the embodiment is configured by a combination of an intermediate pusher outer tube 1 and an intermediate pusher inner tube 2. The intermediate outer tube 1 is disposed at the front in the propulsion direction (see arrow A), the intermediate inner tube 2 is disposed at the rear, and the inner inner tube 2 is connected to the inner diameter from the rear of the intermediate outer tube 1. Mated to the surface.
[0018]
The intermediately pressed outer tube 1 includes a metal tube portion 3 as an annular metal member, and a concrete tube portion 4 that is formed concentrically at the front end and integrated with the same outer diameter. An inner collar 5 as an annular metal member is provided on the inner diameter surface of the metal tube portion 3 at a position close to the front end portion. The concrete tube portion 4 is provided on the outer surface of the inner collar 5 and the inner diameter surface of the metal tube portion 3. The rear ends of the two are joined together. The intermediate outer tube 1 is manufactured by a centrifugal molding machine. The metal tube portion 3 is attached to the mold in advance, and the concrete tube portion 4 is formed by centrifugal molding so that they are integrally coupled.
[0019]
As shown in FIG. 2, the metal pipe portion 3 is complementary to a notched circular steel member 3 a provided with a notched portion 6 over its entire length and a portion of the notched portion 6. And a nonmagnetic metal member 3b joined and integrated by welding. As the nonmagnetic metal member 3b, for example, austenitic stainless steel can be used. This material is the same for other nonmagnetic metal members described below.
[0020]
The inner collar 5 has a steel member 5a having a notch 7 having the same width at the same position as the notch 6 of the metal tube part 3, and is welded to the notch 7. And the non-magnetic metal member 5b joined and integrated.
[0021]
A contact ring 8 is detachably attached to the rear surface of the inner collar 5 by a bolt 9. The bolt 9 is screwed into a nut 10 embedded in the concrete pipe portion 4. The abutment ring 8 is constituted by a channel-shaped steel ring, and a large number of reinforcing ribs 11 are provided on the inner side over the entire circumference. The front end of the intermediate pressing device 12 configured by a required number of jacks is applied to the above-described contact wheel 8 (see FIG. 1). The contact ring 8 distributes the load acting on the inner collar 5 from the intermediate pushing device 12 to protect it, and is removed after the construction is completed. Further, the contact wheel 8 is provided with a recess 13 for inserting a later-described regulation square bar 31 (see FIG. 5).
[0022]
Depending on the specifications of the intermediate push outer pipe 1, the concrete pipe portion 4 may be omitted and the tip end portion of the metal pipe portion 3 may be directly connected to the rear end portion of the front propulsion pipe.
[0023]
On the other hand, as shown in FIG. 1, the inner pusher tube 2 is formed by joining and integrating an insertion ring 15 having an L-shaped cross section at the rear end portion of the metal tube portion 14. The tip of the rear propulsion pipe 16 is inserted into the insertion ring 15. An inner collar 17 is provided on the inner diameter surface of the rear end portion of the metal pipe portion 14 so as to face the insertion ring 15. A number of reinforcing ribs 18 are provided between the inner collar 17 and the insertion ring 15. An inward leading end collar 19 is provided at the leading end portion of the metal tube portion 14. The metal pipe portion 14, the insertion ring 15, the inner collar 17 and the tip collar 19 all constitute an annular metal member.
[0024]
The tip collar 19 is provided with a recess 21 for inserting the intermediate pressing device 12 (see FIGS. 4 and 5). The rear end of the intermediate pressing device 12 inserted through the recess 21 is brought into contact with the inner collar 17 (see FIG. 1).
[0025]
Several strips of metal wire 22 are wound around the outer peripheral surface of the distal end portion of the metal pipe portion 14 with a slight interval, and a seal member 23 is attached to the interval portion (see FIG. 6). When the distal end portion of the metal tube portion 14 of the inner pusher inner tube 2 is inserted into the inner diameter surface of the metal tube portion 3 of the intermediate pusher outer tube 1 from its rear end portion and fitted together, the fitting portion of both is a seal member. 23, they are brought into close contact with each other and sealed. The metal wire 22 also constitutes an annular metal member.
[0026]
Similarly to the metal tube portion 3 of the intermediate pusher outer tube 1, the metal tube portion 14 also includes a steel member 14 a (see FIGS. 3 and 4) having a notch portion 24 and the notch portion 24. And a non-magnetic metal member 14b joined and integrated. The insertion ring 15 also has a steel member 15a provided with a notch 25 having the same width at the same position as the notch 24, and a nonmagnetic metal member 15b joined and integrated with the notch 25. It consists of.
[0027]
Similarly, the inner collar 17 includes a steel member 17a having a notch 26 (see FIG. 3) and a nonmagnetic metal member 17b joined and integrated with the notch 26. Further, similarly for the tip collar 19 and the metal wire 22, steel members 19 a and 22 a each having a notch 27 (see FIGS. 4 and 5) and 28 (see FIG. 3), and the notch 27, 28 and non-magnetic metal members 19b and 22b joined and integrated.
[0028]
The above is the configuration related to the iron loss prevention structure of the intermediately pressed outer tube 1 and the intermediately pressed inner tube 2, but the anti-rotation structure of both will now be described.
[0029]
The anti-rotation structure includes a regulation square bar 31 (see FIGS. 1, 3, and 5) as a regulation convex portion provided in the intermediate pusher outer tube 1 and a pair of opposed as a regulation concave portion provided in the intermediate pusher inner tube 2. The guide plates 32 and 32 are configured.
[0030]
As shown in FIG. 5, the regulation square bar 31 is joined and integrated with the rear surface of the inner collar 5, and is inserted into the recess 13 of the contact ring 8, and its rear end is in the vicinity of the rear end portion of the metal tube portion 3. To reach. In addition, a space a (see FIG. 1) for receiving the intermediate inner tube 2 is provided between the regulation square bar 31 and the inner diameter surface of the metal tube portion 3.
[0031]
The guide plates 32, 32 are joined and integrated to the inner diameter surface of the metal tube portion 14 inside the notch recess 33 (see FIG. 5) provided in the tip collar 19 of the inner pusher tube 2. It has parallel opposing surfaces that receive the restricting square bar 31.
[0032]
The positional relationship between the position of the regulation square bar 31 and the guide plates 32 and 32 fitted therewith is such that the metal tube portions of the intermediate pusher outer tube 1 and the intermediate pusher inner tube 2 when they are fitted. The nonmagnetic metal members 3b and 14b of 3 and 14 are in a relationship of overlapping inside and outside. The regulation square bar 31 and the guide plates 32 and 32 are combined so as to be freely detachable in the length direction.
[0033]
It should be noted that the position where the regulation square bar 31 and the guide plates 32 and 32 are provided is desirable because the steel members 3a and 14a are wider in the circumferential direction than the non-magnetic metal members 3b and 14b.
[0034]
The embodiment of the intermediate pusher tube is configured as described above, and the intermediate pusher 12 is interposed between the contact ring 8 of the intermediate pusher outer tube 1 and the inner collar 17 of the intermediate pusher inner tube 2, and the restriction square bar. When 31 is fitted between the guide plates 32, 32, the nonmagnetic metal members 3b, 14b are in a position where they overlap each other and are interposed between the propelling pipes 16 in this state.
[0035]
When the main pushing device is driven, the intermediate pushing inner tube 2 is pushed in by contracting the middle pushing device 12 in the direction of arrow A in FIG. When the intermediate pushing device 12 is driven, the intermediate pushing outer tube 1 is advanced by generating a propulsive force with the inner pushing inner tube 2 side as the reaction force support side.
[0036]
In the construction process of the propulsion method as described above, even if a circumferential force acts between the intermediate pusher outer tube 1 and the intermediate pusher inner tube 2, the engagement between the regulation square bar 31 and the guide plates 32, 32. Thus, the relative rotation of the two is regulated. As a result, the positional relationship between the nonmagnetic metal members 3b and 14b is maintained.
[0037]
Further, even if the intermediate pusher outer tube 1 and the intermediate pusher inner tube 2 bend with each other or contract in the axial direction, both may come into contact with each other as long as the relative rotation of both is prevented. The nonmagnetic metal members and the steel members are only in contact with each other, and the nonmagnetic metal members 3b and 5b of the intermediate pusher outer tube 1 are in contact with the steel members 14a, 15a, 19a and 22a of the intermediate pusher inner tube 2. On the contrary, the nonmagnetic metal members 14b, 15b, 19b, and 22b of the inner presser inner tube 2 do not contact the steel members 3a and 5a of the intermediate presser outer tube 1.
[0038]
【The invention's effect】
As described above, according to the present invention, in the power cave constructed by the propulsion method using the intermediate pusher pipe, the circumferential direction of the intermediate pusher outer pipe and the intermediate pusher inner pipe constituting the intermediate pusher pipe is increased. Since the relative rotation is restricted by the fitting of the restricting convex part and the restricting concave part, the positional relationship between the two nonmagnetic metal members is maintained. As a result, the nonmagnetic metal member of one tube is not brought into contact with the steel member of the other tube and short-circuited, and the passage of magnetic flux can be reliably prevented. As a result, it is possible to prevent the occurrence of iron loss in the intermediate pusher tube, and for the other propulsion pipes, the use of non-ferrous metal type iron loss prevention type means less power loss over the entire length. A cavernous canal can be constructed.
[Brief description of the drawings]
1 is a cross-sectional view taken along the line II-II of FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1. FIG. 4 is an exploded perspective view of the same. Partially enlarged exploded perspective view of the same. [FIG. 6] Partially enlarged sectional view of FIG.
DESCRIPTION OF SYMBOLS 1 Middle push outer pipe 2 Middle push inner pipe 3 Metal pipe part 3a Steel member 3b Nonmagnetic metal member 4 Concrete pipe part 5 Inner collar 5a Steel member 5b Nonmagnetic metal member 6 Notch part 7 Notch part 8 Contact ring 9 Bolt 11 Reinforcement rib 12 Intermediate pressing device 13 Recess 14 Metal pipe portion 14a Steel member 14b Nonmagnetic metal member 15 Insertion ring 15a Steel member 15b Nonmagnetic metal member 16 Propulsion pipe 17 Inner collar 17a Steel member 17b Nonmagnetic metal member 18 Reinforcing rib 19 Tip collar 19a Steel member 19b Nonmagnetic metal member 21 Recess 22 Metal wire 22a Steel member 22b Nonmagnetic metal member 23 Seal member 24 Notch portion 25 Notch portion 26 Notch portion 27 Notch 28 Notch 31 Restriction square bar 32 Guide plate 33 Notch recess

Claims (4)

In the intermediate pusher tube for the propulsion method of the power cave constructed of a combination of the intermediate pusher outer tube and the inner pusher tube fitted to the inner diameter side from the rear portion, the intermediate pusher outer tube and the intermediate pusher inner tube are The annular metal member is constituted by a notched circular steel member provided with a notch in a part of the circumference, and a nonmagnetic metal member integrated and integrated in the notch, And a non-magnetic metal member of the inner pusher tube is provided on the intermediate pusher tube and the intermediate pusher tube with a regulating means for restricting the positional relationship between the inner pusher tube and the inner pusher tube. Medium push pipe for propulsion method. The restricting means includes a restricting convex portion provided on the intermediate pusher outer tube and a restricting concave portion provided on the intermediate pusher inner tube. 2. The intermediate push pipe for the electric power road propulsion method according to claim 1, wherein the push pipes are combined so as to be detachable in the length direction of the push inner pipe. The restricting convex portion is constituted by a restricting rod that protrudes rearward from the inner collar rear surface of the inner diameter surface of the inner pusher outer tube and is provided with a required interval between the inner diameter surface, 3. The power road propulsion according to claim 2, wherein the restriction recess is configured by a guide having a parallel opposing surface that is provided on an inner diameter surface of the inner pusher tube and receives the restriction rod. Medium push pipe for construction method. 4. The intermediate push tube for a power road propulsion method according to claim 1, wherein the nonmagnetic metal member is austenitic stainless steel. 5.

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