JP2991674B2 - Propulsion pipe and pushing wheel for propulsion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propulsion pipe and a push ring for a propulsion method.

[0002]

2. Description of the Related Art A propulsion method has been frequently used as a method of burying a ductwork without causing congestion of an underground object or a traffic obstacle. The length of the propulsion pipe used in this method is 0.4 considering the water stoppage and seismic resistance of the joint part of the propulsion pipe in the curved part included in the construction area.
範 囲 2.43 m.

[0003] The above-mentioned propulsion pipe is generally a centrifugal reinforced concrete pipe (so-called fume pipe). The front end of the propulsion pipe as viewed in the propulsion direction is formed into a slightly smaller diameter to serve as an inlet, and the rear end is made of steel. Are integrally provided.

[0004]

In the propulsion method, the propulsion pipe as described above is pushed in by a propulsion device while sequentially adding the propulsion pipe in the starting pit. In this case, inside the propulsion pipe, plumbing pipes such as a drain pipe, a hydraulic hose, a blower pipe, a water supply pipe, and a lubricant supply pipe,
Cables for power supply, measurement management, control, and the like are inserted, and these pipes and cables are drawn out of the starting pit to the ground, and are respectively connected to ground facilities.

As described above, when a new propulsion pipe is to be added while the pipes and cables are inserted through the cylindrical propulsion pipe, the pipes and cables are once cut off and the new propulsion pipe is cut off. It is necessary to install the propulsion pipe in the starting pit, reconnect the pipes and cables after inserting the cut ends of the propulsion pipe into the propulsion pipe.

[0006] The above-mentioned pipes are steel pipes, FRP pipes, or the like, and are connected using joints. The length of the pipes is the same as that of the propulsion pipe (0.4 to 2.43 m). Since a shorter part is used in the part, the frequency of disconnection and reconnection of the piping is increased, which causes a significant decrease in work efficiency.

[0007] In particular, the sludge pipe is separated from the ground by a head difference from the sludge tank on the ground, and when separated, the sludge flows backward and spouts into the starting pit, thereby contaminating the inside of the starting pit and workers. Is a major cause of difficulty in work.

Accordingly, the present invention provides a propulsion pipe and a press ring which can be refilled without disconnecting pipes and cables when refilling the propulsion pipe, thereby improving work efficiency and eliminating contamination by sludge. The task is to provide.

[0009]

[Means for Solving the Problems]

(1) In order to solve the above problems, a propulsion pipe according to the present invention includes a reinforced concrete pipe body provided with a slit having a required width over the entire length, and a reinforced concrete that is fitted and locked in the slit so as to be freely detachable. And a main body side plate integral with the internal reinforcing bar of the pipe main body is provided on both inner side surfaces of the slit of the pipe main body, respectively, and a lid body integral with the internal reinforcing bar is provided on both outer side surfaces of the lid body, respectively. A side plate is provided, and the lid is fitted and locked in the slit of the tube main body, and the main body side plate and the lid side plate are connected and integrated by a coupling means (claim 1). The propulsion pipe of the above configuration is hung in a start pit with the lid connected to the pipe main body, and after removing the lid, pipes and cables are inserted into the inside of the pipe through the slit of the pipe main body, and then the lid is closed. The body is fitted and locked in the slit and connected to the pipe main body to form a cylindrical propulsion pipe, which is thereafter used in the same manner as a normal propulsion pipe.

(2) In the propulsion pipe having the above-described configuration, the main body side plate is provided with a locking step protruding inward of the slit over the entire length, and a positioning portion is provided on a part of the main body side plate. The side plate is provided with an engaging recess for engaging with the locking step portion over its entire length, and a part of the lid side plate is fitted with the positioning portion to position the lid in the longitudinal direction with respect to the tube body. It is possible to adopt a configuration in which a counterpart positioning portion is provided. The positioning portion and the mating positioning portion fitted thereto have an uneven fitting structure, but it does not matter which of the main body side plate and the lid side plate becomes the positioning concave portion or the positioning convex portion.

(3) In the above-mentioned propulsion pipe, the slit may have a width corresponding to a central angle of 90 degrees or near 90 degrees of the pipe body (claim 3). This is because, when a normal cylindrical propulsion pipe is buried in the ground, the distribution of earth pressure acting on the propulsion pipe becomes the smallest around 45 degrees from the top of the upper surface to both sides. Is provided at a position where the pressure distribution is small.

(4) In the above-described propulsion pipe, the pipe body has a main body female joint at one end thereof and a main body male joint at the other end, and the lid has a lid female joint at one end thereof. Having the other end with a lid male joint, in a state where the lid is fitted and locked in the slit of the tube main body, the main body female joint and the lid female joint form one female joint, A configuration in which the main body male joint and the lid male joint form one male joint can be adopted (claim 4). In a normal propulsion pipe,
Although a female joint made of a steel plate serving as a receiving port is integrally provided at the rear end, a male joint is not necessarily provided at a front end serving as a receiving port. However, in the propulsion pipe in which the pipe main body and the lid are separated as in the present invention, the internal reinforcements of the pipe main body and the lid are independent of each other. It is necessary to provide a female female joint and a male male joint at both ends, respectively, and a female female joint and a male male cover at both ends of the lid, respectively.

(5) In the above-mentioned propulsion pipe, lower protruding portions for joints are provided on both side edges of the main body female joint and the main body male joint, respectively, and each of the lid female joint and the lid male joint is provided. It is possible to adopt a configuration in which lower recesses for a joint which are engaged with the lower projections are provided on both side edges, respectively. When the lid is fitted and locked in the slit of the pipe main body, the lower recesses of the female joint of the lid and the male joint of the lid male engage with the lower projections of the female female body and the male male body of the pipe main body, respectively. A split joint is formed to improve the integrity and sealing between the female joint of the main body and the female joint of the lid and between the male joint of the main body and the male joint of the lid.

(6) In the above-mentioned propulsion pipe, a structure in which a protective steel plate is integrally provided on the upper surface of the lid can be adopted. With this configuration, when drilling or excavation is mistakenly performed from the ground surface after burying the propulsion pipe,
The propulsion pipe is protected by the protective steel plate.

(7) In the above-mentioned propulsion pipe, the heights of the inner peripheral side of the main body side plate and the lid side plate on the inner peripheral side of the propulsion pipe are determined with reference to the concrete outer peripheral surfaces of the pipe main body and the lid, respectively. By forming lower than the peripheral surface,
It is possible to adopt a configuration in which a step portion on the main body side and a step portion on the lid side are formed, and these step portions are abutted in the circumferential direction to form a mounting groove for the seal member. In the propulsion pipe having the above configuration, the body side plate and the lid side plate are lower than the thickness of the concrete, so that the fluidity of the concrete is improved at the time of manufacturing. Conversely, if each side plate is formed at the same height as the thickness of concrete, the fluidity of concrete will be hindered, the thickness of concrete near the side plate will be insufficient, and it will be necessary to supplement the mortar. Then, the fluidity is improved and the thickness of the concrete is uniformly finished. In addition, the inner peripheral edge of the side plate is buried in the concrete at the time of manufacturing, but after the concrete is solidified, a file is added to expose the inner peripheral edge of the side plate. Since the main body side step portion and the lid body side step portion are generated by the razor, the mounting groove of the seal member is formed by aligning both step portions in the circumferential direction. Therefore, the sealing effect can be increased by mounting the sealing member in the groove.

(8) When the above-described propulsion tube is pushed by the propulsion device, an annular pressing wheel is interposed between the propulsion tube and the propulsion device. Since pipes and cables are also inserted into this push wheel, when the push wheel is moved to the rear end of a new propulsion pipe, it is necessary to disconnect and reconnect the pipes and cables. In order to solve the inconvenience, the pressing ring according to claim 8 is formed by a cut-out circular member having a slit similar to the end face shape of the tube main body. According to this shape of push wheel, piping and cables can be passed through the slit,
The pressing wheel can be moved without separating them.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1A and 1B, a propulsion pipe 1 for a propulsion method according to the present invention comprises a pipe main body 2 and a lid 3.
Consists of The pipe main body 2 and the lid 3 are both made of reinforced concrete having the same radius of curvature. The tube body 2 is provided with a slit 4 having a required width over the entire length thereof, and the lid 3 is fitted and locked inside the slit 4 so as to be freely detachable.

As shown in FIG. 2, the width of the slit 4 has a width corresponding to the central angle θ (90 degrees in the case shown) of the tube main body 2. The center angle θ, that is, the width of the slit 4 is appropriately selected within a range where the pipes and cables used in the propulsion method can be freely passed and the necessary strength of the pipe main body 2 is maintained. Desirably, it is desirable to select an angle of 90 degrees or an angle near it (about ± 10 degrees).

The distribution of the earth pressure acting on the propulsion pipe is as follows:
As shown in FIG. 3, the tensile stress is distributed in a range indicated by a sign a of ± 45 degrees with respect to a vertical reference line V passing through the center of the propulsion pipe 1, and a horizontal reference line H The compressive stress is distributed in a range indicated by a sign b of ± 45 degrees with respect to. The inflection point c at which the tensile stress changes to the compressive stress is a portion where the pressure distribution is minimized. Therefore, by locating the joint between the pipe body 2 and the lid 3 at the inflection point c, the load resistance of the propulsion pipe can be maintained equal to that of a normal propulsion pipe.

The pipe main body 2 has a main body side plate 5 (see FIG. 2) made of a steel plate on both inner surfaces of the slit 4, and a main body female joint made of a steel plate is provided at a rear end (reception port side) of the main body side plate 5. 6 (FIG. 1
) Is provided, and a main body male joint 7 also made of a steel plate is provided at the front end (insertion side).

As shown in FIGS. 4 and 5, the main body side plate 5 has an engaging step 8 projecting inwardly of the slit 4 at an intermediate portion in the width direction over the entire length.

Further, a part of the main body side plate 5 is provided with a tapered positioning recess 9 whose upper end side is widened and narrowed downward.

The main body side plate 5 is provided with bolt holes 11 at regular intervals in its length direction.
The bolt operation box 12 is integrally provided on the inner surface of the main body side plate 5 (the surface opposite to the slit 4) (FIG. 7).
(B)). The bolt operation box 12 is open to the inner surface of the tube body 2.

The female joint 6 of the main body is shown in FIG.
As shown in FIG. 3, the center of a joint plate 14 having a cutout section is welded to the outer periphery of a cutout end plate 13 along the rear end face of the pipe body 2. And the other part is integrated with the concrete 15 of the pipe body 2. The end plate 13 and the joint plate 14 are welded and integrated to the rear end of the main body side plate 5, that is, the female end. Lower joints 16 are formed on both side surfaces of the joint plate 14 for a joint.

As shown in FIGS. 5 and 8, the concrete 15 of the pipe body 2 has a small diameter portion 18 at a front end thereof via a step 17.
Is provided.

As shown in FIGS. 6 and 8, the main body male joint 7 has a circular shape along the outer circumference of the small-diameter portion 18 on the outer circumference of the cutout end plate 19 along the end surface of the small-diameter portion 18. The arc-shaped small-diameter joint plate 21 is welded, and the arc-shaped large-diameter joint plate 22 along the outer periphery of the large-diameter portion of the concrete 15 is connected to the small-diameter joint plate 21 via a spacer 23 corresponding to the height of the step portion 17. Is welded to the outer surface of the end. Two ribs 24 parallel to the circumferential direction are integrally welded to the outer surface of the small-diameter joint plate 21 to prevent a later-described packing 25 from shifting.

A reinforcing bar 26 is provided in the length direction and the width direction between the main body female joint 6 and the main body male joint 7, and forms a skeleton of the pipe main body 2.

On the other hand, the cover 3 is
Are provided with hanging bolt insertion holes 27 (see FIGS. 1 and 2), and a steel plate cover side plate 5 'is provided on both outer surfaces of the concrete 15' (see FIG. 4). At the rear end of the side plate 5 ', a female joint 6' made of steel plate is provided, and at the front end, a male joint 7 'made of steel plate is also provided (see FIG. 5).

The lid side plate 5 'is shown in FIGS.
As shown in (a), a locking recess 8 ′ is provided in the middle portion in the width direction over the entire length, and is locked on the locking step 8 of the main body side plate 5. The locking positions the lid 3 in the radial direction with respect to the tube body 2.

FIG. 4 shows a part of the lid side plate 5 '.
As shown in FIG. 5A and FIG. 5, a tapered positioning projection 9 ′ having a wide upper end and narrowing downward is provided, and is vertically detachable in the positioning recess 9 of the main body side plate 5. Is fitted to. The fitting positions the lid 3 in the longitudinal direction with respect to the tube body 2.

The cover side plate 5 'is provided with a bolt hole 11' corresponding to the bolt hole 11 of the main body side plate 5, and a nut 28 is welded to the inner surface of the bolt hole 11 '(FIG. 7 (b)).

The lid female joint 6 'has an arc-shaped end plate 13' along the rear end face of the lid 3 (see FIG. 4A).
The center part of an arc-shaped joint plate 14 'is welded to the outer surface of the joint plate 14'. About half of the joint plate 14 'protrudes rearward beyond the end plate 13', and the remaining part is the concrete 1 of the lid 3
Integrated with 5 '. The end plate 13 'and the joint plate 14'
Are integrally welded to the rear end of the lid side plate 5 '.

On both sides of the joint plate 14 ', FIG.
As shown in (a), the lower concave portion 16 ′ for a split joint is used.
Is formed, and is combined with the lower projection 16 of the joint plate 14 of the female female joint 6 in a notched joint shape (see FIG. 7A).

As described above, the structure of the female cover joint 6 ′
The main body female joint 6 has the same structure as the main body female joint 6 except for the size of the central angle. In a state where the lid 3 is fitted and locked in the slit 4 of the pipe main body 2 to form the propulsion pipe 1, the female female joint 6 and the female lid 6 ′ constitute an annular female joint 29 as a whole ( FIG. 1A).

As shown in FIG. 8, the concrete 15 'of the lid 3 is provided with a small-diameter portion 18' at the front end via a step 17 ', and the male male cover 7' is provided with the small-diameter portion 18 '. The small-diameter portion 18 'is formed on the outer periphery of an arc-shaped end plate 19' along the end face of the small-diameter portion.
The arc-shaped small-diameter joint plate 21 'along the outer periphery of the concrete 15' is welded and the arc-shaped large-diameter joint plate 22 'along the outer periphery of the large-diameter portion of the concrete 15' is spacers corresponding to the height of the step 17 '. This is welded to the outer surface of the end of the small-diameter joint plate 21 ′ via 23 ′. Two ribs 24 ′ are provided on the outer surface of the small-diameter joint plate 21 ′ in parallel with the circumferential direction.

As described above, the structure of the cover male joint 7 'is the same as that of the above-described main body male joint 7 except for the size of the central angle, and the other structures are the same. An annular male joint 31 is constituted by the joint 7 '(FIG. 1 (a)).
reference).

A reinforcing bar 26 ′ is provided in the length direction and the width direction between the female cover joint 6 ′ and the male cover joint 7 ′, and forms a skeleton of the cover 3.

In the propulsion pipe 1, the skeleton of the above-mentioned pipe body 2 and the skeleton of the lid 3 are housed in a cylindrical form in combination in a basket form, and then concrete is put thereinto. It is formed by rotating at high speed and applying centrifugal force. During the molding, the main body side plate 5 and the lid body side plate 5 'hinder the circumferential flow of the concrete, and the finished surface of the concrete near these side plates 5, 5' may be recessed. In order to do so, as shown in FIG.
The height of 5 ′ (height based on the outer peripheral surface of concrete 15, 15 ′) may be formed to be lower than the finished inner peripheral surface of concrete 15, 15 ′. By doing so, the fluidity of the concrete is improved, and the finished heights of the inner peripheral surfaces of the concretes 15 and 15 'are made uniform.

If both side plates 5, 5 'are formed low as described above, a concave portion is formed between the inner peripheral surfaces of the concrete 15, 15', so that this portion is also filled with concrete. However, the filled concrete can be easily removed by adding a filer after molding, and the removal results in a main body side step 32 and a lid side step 32 '. When these two step portions 32 and 32 ′ are abutted in the circumferential direction, a mounting groove 34 of the packing 33 in the length direction is formed.

Concrete 1 between the joint plate 14 'of the female cover joint 6' and the large-diameter joint plate 22 'of the male cover joint 7'.
A protective steel plate made of a steel plate covering the exposed portion of 5 ′ may be provided integrally with the concrete 15 ′. FIG. 10 shows a case where the two joint plates 14 ′ and 22 ′ are integrated and the joint plates 14 ′ and 22 ′ are also used by one protective steel plate 35.

The above-mentioned protective steel plate 35 is used when boring or the like is mistakenly performed from the ground after the propulsion pipe 1 is buried.
The propulsion pipe 1 is prevented from being destroyed.

The propulsion pipe 1 according to the embodiment is as described above. After centrifugal molding is performed in a factory, a suspension bolt 37 (see FIG. 2) is attached to the suspension bolt insertion hole 27 of the lid 3 and the lifting machine is used. The lid 3 is temporarily removed from the pipe main body 2 (see a two-dot chain line in FIG. 2), and a sealing agent 36 (see FIG. 7) is filled between the main body side plate 5 and the lid side plate 5 ′. Into the slit 4 and the bolt operation box 12
The bolt 37 is inserted into the bolt holes 11 and 11 ′ and the cover 3 is integrally connected to the pipe body 2 by screwing to the nut 28, and further, around the small-diameter joint plates 21 and 21 ′ of the male joint 31. The packing 25 is mounted between the ribs 24 and 24 'and transported to the site.

FIG. 11 shows a portion of a starting shaft 38 in which the above-described propulsion pipe 1 is used to carry out the propulsion method. Start pit 38
A propulsion device 42 including a required number of jacks 39, reaction force support walls 41, and the like, a base 40, and the like are installed in the inside. The propulsion pipes 1 suspended from the ground on the base 40 are sequentially added to each other, and Push into the excavation pit 43. On the ground around the starting pit 38, a lifting machine 44, a sludge tank 52, a winding drum 53, and other various kinds of machinery and equipment required for the propulsion method are installed, and various pipes 45 and cables 4 connected to these are installed.
Class 6 is drawn into the propulsion pipe 1 in the excavation pit 43.

A push ring 47 is interposed on the rear end face of the rearmost propulsion tube 1 to which a propulsion force is directly applied by the propulsion device 42 via a cushion material 49. As shown in FIG. 14, the pressing ring 47 is formed by a missing circular member having a slit 48 that matches the end face of the tube body 2.

In FIG. 14, the position at which the jack 39 is pressed against the end face of the pressing wheel 47 is indicated by a chain line.

As shown in FIG. 11, when the propulsion of the last propulsion pipe 1 is completed, the pipe 45 and the cable 46 are pulled out from the slit 48 of the push wheel 47 to the ground, and the pipe 4
5 is connected to the sludge tank 52 or the like with a required extra length,
The cable 46 is connected to required equipment via a winding drum 53.

Next, as shown in FIG. 12, the propulsion device 42 is contracted before the new propulsion pipe 1 is suspended in the starting shaft 38,
The push wheel 47 is moved backward by the lifting device 44, and a new propulsion pipe 1 is suspended between the push wheel 47 and the last propulsion pipe 1. The center is aligned with the last propulsion tube 1 on the base 40, and the operator operates the bolt operation box 12 from inside the new propulsion tube 1.
(Refer to FIG. 7 (b)) Insert a tool and remove the bolt 37.

Thereafter, as shown in FIG. 13, the lid 3 is lifted to open the slit 4 of the pipe main body 2 and the slit 4 and the slit 48 of the pressing ring 47 are pulled out from the rear end of the last propulsion pipe 1. The pipe 45 and the cable 46 are passed (see FIG. 14). Thereafter, the lid 3 is fitted and locked in the slit 4 again, and the bolt 37 is fastened. Next, the end plates 13, 13 'of the female joint 29 at the rear end of the last propulsion tube 1,
A cushion material 49 is interposed between the new propulsion pipe 1 and the end plates 19 and 19 ′ of the male joint 31, and a sealant 51 is provided.
(See FIG. 8).

Thereafter, the propulsion device 42 is slightly moved to move the pressing wheel 4.
7, the new propulsion pipe 1 is pushed, and the male joint 31 of the propulsion pipe 1 is inserted into the female joint 29 of the last propulsion pipe 1. As a result of the insertion, the packing 25 comes into close contact with the inner peripheral surface of the female joint 29, and the sealing agent 51 is compressed and enters the gap. As the sealant 51 in this case, a material obtained by adding a curing agent to liquid polybutadiene (commercially available under the trade name of “TS seal”) is preferable.

After completing the above preparations, the propulsion device 4
2 is driven to propel all the preceding propulsion tubes 1 in the excavation pit 43 together with the new propulsion tube 1. Thereafter, a new propulsion pipe is added and propelled one after another in the same manner.

The pipe 45 has an appropriate extra length on the ground, so that it is not necessary to add another pipe until the extra length is exhausted. However, when the extra length is exhausted, it is necessary to add a new pipe 45. In this case, since the replenishment is performed on the ground which is not affected by the head difference, there is no contamination of the surrounding area due to the ejection of the sludge.

[0052]

As described above, since the propulsion pipe and the press ring according to the present invention have slits, there is no need to disconnect and reconnect pipes and cables when adding the propulsion pipe. Is greatly improved, and the surrounding area is prevented from being polluted because no mud is blown out.
Further, since a flexible tube can be used for the piping, a curved portion can be dealt with without using a joint.

The pipe body and lid of the propulsion pipe are made of reinforced concrete and have a required thickness. However, since the lid is fitted inside the slit of the pipe, a step is formed on the outer peripheral surface. And can be handled in the same manner as a normal cylindrical propulsion pipe.

Further, since the pipe main body and the lid are independent from each other via the main body side plate and the lid side plate, the lid can be easily separated from the pipe main body after the both are integrally formed by centrifugal molding. Can be.

Further, according to the second aspect of the present invention, the positioning of the lid in the radial direction and the length direction with respect to the pipe main body is ensured. According to the third aspect of the present invention, a load resistance equivalent to that of a normal propulsion pipe can be obtained. According to the fourth aspect of the invention, it is easy to independently configure the skeleton including the reinforcing bar of the pipe main body and the lid. According to the fifth aspect of the present invention, the sealability of the joint portion is improved by the joint break. The invention according to claim 6 can prevent breakage of the propulsion pipe when boring is performed from the ground by mistake. According to the invention of claim 7, the finished thickness of the concrete at the time of centrifugal molding becomes uniform, and the sealing property between the main body side plate and the lid side plate is improved.

[Brief description of the drawings]

FIG. 1A is a perspective view of a propulsion pipe according to an embodiment. FIG. 1B is an exploded perspective view of the same.

FIG. 2 is an enlarged sectional view of the above.

FIG. 3 is a pressure distribution diagram of the above.

FIG. 4 (a) is a partial perspective view of a lid body of the above, and (b) is a partial perspective view of a pipe body of the same.

FIG. 5 is a partially cut-away exploded perspective view of the same.

FIG. 6 is a perspective view of a front end portion of the pipe body according to the first embodiment;

7A is a sectional view taken along line 7a-7a in FIG. 1A. FIG. 7B is a sectional view taken along line 7b-7b in FIG. 1B.

FIG. 8 is a sectional view of a butt portion of the propulsion tube according to the first embodiment.

FIG. 9 is a sectional view of a modified example taken along line 7a-7a of FIG.

10 (a) is a perspective view of a modification of the above lid, and FIG. 10 (b) is an enlarged sectional view of FIG. 10 (a).

FIG. 11 is a sectional view showing the state of implementation of the propulsion method.

FIG. 12 is a sectional view showing the state of implementation of the propulsion method.

FIG. 13 is a sectional view showing the state of implementation of the propulsion method.

FIG. 14 is a partial perspective view when the propulsion method is implemented.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Pipe main body 3 Lid 4 Slit 5 Main body side plate 5 'Lid side plate 6 Main body female joint 6' Lid female joint 7 Main body male joint 7 'Lid male joint 8 Locking step 8' Locking recess 9 Positioning recess 9 'Positioning projection 11 Bolt hole 11' Bolt hole 12 Bolt operation box 13 End plate 13 'End plate 14 Joint plate 14' Joint plate 15 Concrete 15 'Concrete 16 Lower protrusion 16' Lower recess 17 Step 17 ' Step 18 Small diameter portion 18 'Small diameter portion 19 End plate 19' End plate 21 Small diameter joint plate 21 'Small diameter joint plate 22 Large diameter joint plate 22' Large diameter joint plate 23 Spacer 23 'Spacer 24 Rib 24' Rib 25 Packing 26 Iron bar 26 'Reinforcing bar 27 Hanging bolt insertion hole 28 Nut 29 Female joint 31 Male joint 32 Body side step 32' Lid side step 33 Packing 34 Mounting groove 3 Reference Signs List 5 protection steel plate 36 sealant 37 hanging bolt 38 launching pit 39 jack 40 base 41 reaction force support wall 42 propulsion device 43 muddy tank 44 winding drum 45 pipe 46 cable 47 press ring 48 slit 49 cushion material 51 sealant 52 excavation Pit 53 lifting machine

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Miyahara 961 Toendo, Aichigawa-cho, Aichi-gun, Shiga Prefecture Inside Kurimoto Concrete Industry Co., Ltd. 47 at 373 (56) References JP2-106093 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/06 311

Claims (8)

(57) [Claims] 1. A reinforced concrete pipe main body provided with a slit of a required width over the entire length, and a reinforced concrete lid body fitted and locked in the slit so as to be freely detachable. A body side plate integral with the internal reinforcing bar of the pipe body is provided on each of the inner side surfaces, and a lid body side plate integral with the internal reinforcing bar is provided on each of the outer side surfaces of the lid. A propulsion pipe for a propulsion method, wherein the main body side plate and the lid side plate are connected and integrated by a connecting means. 2. A locking step projecting inwardly of the slit is provided on the main body side plate over the entire length, a positioning portion is provided on a part of the main body side plate, and the locking step is provided on the lid side plate. An engaging recess to be engaged is provided over the entire length thereof, and a mating positioning portion is provided at a part of the lid body side plate to be fitted with the positioning portion to perform positioning of the lid body in the longitudinal direction with respect to the tube body. A propulsion pipe for a propulsion method according to claim 1. 3. The tube according to claim 1, wherein the slit is 90 degrees or 90 degrees.
The propulsion pipe for a propulsion method according to claim 1 or 2, having a width corresponding to a central angle near the degree. 4. The tube main body has a female body joint at one end and a male body joint at the other end, and the lid has a female joint at one end and a lid at the other end. In a state where the main body female joint and the lid female joint form one female joint, the main body male joint and the lid 4. The propulsion pipe for a propulsion method according to claim 1, wherein the male joint forms one male joint. 5. A lower projection for connecting and disconnecting is provided on each of both side edges of the female female joint and the male male joint, and the lower projection is provided on both lateral edges of the female female cover and the male male cover. The propulsion pipe for a propulsion method according to any one of claims 1 to 4, further comprising a lower recessed portion for a joint which engages with the lower portion. 6. The propulsion pipe for a propulsion method according to claim 1, wherein a protective steel plate is integrally provided on an upper surface of the lid. 7. The height of the inner peripheral side of the main body side plate and the lid body side plate on the inner peripheral side of the propulsion pipe is formed lower than the concrete inner peripheral surface of the pipe main body and the lid body with reference to the concrete outer peripheral surface thereof. The main body side step portion and the lid body side step portion are formed respectively, and these step portions are butted in the circumferential direction to form a mounting groove for the seal member.
A propulsion pipe for a propulsion method according to any one of the above. 8. A push ring for a propulsion method comprising a cutout circular member having a slit having the same width as a slit of a pipe body of the propulsion method for a propulsion method according to any one of claims 1 to 7.