JP2001295580A - High-water-pressure joint structure of centrifugal reinforced concrete pipe for propulsion and manufacturing method of the pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a centrifugal reinforced concrete pipe for propulsion which has excellent jointing properties and flexibility in a joint part and which can ensure high watertightness and can endure a high water pressure. SOLUTION: The centrifugal reinforced concrete pipe 1 for propulsion has a jointing part 21 of a reduced bore in the pipe end part on one side, and the jointing part 21 and the whole of the other outer peripheral surface of the pipe are covered with a steel sheet 2. An injection hole 5 is provided in the jointing part 21 so that a lubricant or a water cut-off agent can be injected from inside, and a rubber band fastener 41 is provided on the pipe end side of the jointing part 21, while rings 4 are provided, in widths of individual rubber bands, in the intermediate part. The rubber band 61 for jointing, which functions as a guide for insertion of a collar part, is disposed on the pipe end side, while the rubber band 6 for a joint is disposed on the deep side apart from the pipe end, and the rubber band 62 for water expansion jointing is provided between the rubber band 61 for jointing and the rubber band 6 for the joint.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure joint structure of a propulsion fume pipe for propelling underground and a method of manufacturing the propulsion fume pipe.

[0002]

2. Description of the Related Art Conventionally, a propulsion pipe a has a groundwater pressure of 0.2 MPa.
(Megapascal) in many cases, and water is stopped at the joint of the propulsion pipe a by one rubber ring between the groove c provided at the joint of the joint and the collars b and e. d (see FIG. 11) or two rubber rings f (see FIG. 12).
The rubber ring f has a structure in which an injection hole g for injecting a waterproofing agent is provided at the joint of the propulsion pipe a.

[0003]

(1) However, underground spaces are being developed in urban areas, and sewage pipes, communication and power pipes to be newly installed underground are about 50 m deep underground. Need to be laid. In addition, due to recent improvements in civil engineering technology, construction has been required to be performed up to 50 m underground, that is, up to a high water pressure of about 0.5 MPa. When a fume pipe is laid underground at such a depth, it is important to ensure the watertightness of the pipe joint and the watertightness of the pipe body. (2) The conventional joint structure shown in FIGS. 11 to 12 having a structure in which one rubber ring d or two rubber rings f is arranged at a joint portion of a joint portion is highly watertight at the time of joining in a horizontal state. Even when the joint performance is as described above, sometimes the nectarity of the joint portion is reduced and water may leak. The reason for this is that a part where the compression ratio of the rubber ring is reduced occurs in a part of the pipe circumferential direction due to some factor. For example, when the pipe is subjected to a partial pressure, the pipe may bend or shift at the joint due to the curved construction. The nectarity of the joint portion of the propulsion pipe is such that a rubber ring attached to the propulsion pipe is compressed with a collar, and the repelling force is used to secure water stopping performance. However, if a rubber ring with a large cross-section is used to compress the rubber ring with a strong force, a strong repulsive force will cause a slight displacement of the pipe, which will only slightly change the compression ratio of the rubber ring, so that a high degree of nectarity will be obtained. can get. However, since the pipes must be joined with a large force when joining the pipes, the rubber ring is turned up and the pipes are not in complete contact with each other at the time of joining. Sometimes. Also, since the rubber ring pushes the collar with strong repulsive force, the steel part of the joint part becomes large, and when the pipe must be bent and laid as in the case of curved construction, etc. Are not bent, and the flexibility of the joint portion is impaired. On the other hand, if the repulsion of the rubber ring is reduced by using a rubber ring having a small cross section so that it can be easily joined, the steel property of the joint portion is reduced, so that the pipes are easily bent, and the flexibility of the joint portion is reduced. The rubber ring has the advantage of being better, but the resilience of the rubber ring is reduced. As a result, when a bias is applied to the pipe due to meandering of the pipe or the like and the joint is displaced, there is a problem that an appropriate compression rate of the rubber ring is reduced and water leakage is caused. Therefore, when trying to obtain a high water-honey property at the pipe joint portion, it is a major problem to provide a joint structure that can be easily joined and has a performance that is rich in flexibility. (3) When the propulsion pipe made of concrete is normally propelled,
Since the outer wall surface of the concrete surface is damaged by rubbing or the like, the location where it can be used is up to an external water pressure of about 0.2 MPa. When using at an outside water pressure exceeding this, measures such as reducing damage by covering the outer peripheral surface with a steel pipe are taken. On the other hand, the propulsion pipe is provided with an injection hole h for injecting grout from the inside of the pipe into a gap between the excavated soil and the pipe. Separation occurs between them.
As a result, there is a problem that water infiltrates from the peeled gap, enters through the boundary between the iron plate and concrete, and eventually leaks water from the joint. Further, as shown in FIG. 13, when the propulsion pipe is propelled, a separation M occurs between the iron plate j and the concrete k covering the outer periphery due to friction between the soil and the outer wall surface, and groundwater intrudes from the gap where the separation M has occurred. However, there is a problem that water leakage occurs at the joint L. Furthermore, for the same reason, there is a problem that water leaks from the grout-filled injection hole h. (4) In the conventional method of manufacturing a fume tube for propulsion, a hole is formed for mounting an injection hole in a steel cylinder disposed on the outer periphery, and the hole is formed by placing concrete in a formwork and then casting concrete. I have. However, since the steel cylinder and concrete are not integrally formed around the opening, the iron plate and concrete are separated from each other due to the repeated temperature difference between day and night in the storage place after building and the uneven pressure during propulsion. There is a problem that. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has a good joining property and flexibility in a joint portion, and can ensure high water honey properties, and a propulsion fume tube capable of withstanding high water pressure. It is an object of the present invention to provide a method for manufacturing a propulsion fume tube in which a lubricant injection hole is formed without cutting a structure and a reinforcing bar.

[0004]

In order to achieve the above object, the structure of the propulsion fume tube according to the first aspect of the present invention has a joint 21 having a reduced diameter at one end of the tube. An injection hole 5 is provided in the joint 21 of the propulsion fume tube 1 in which the joint 21 and the entire outer peripheral surface of the tube are covered with the iron plate 2 so that a lubricant or a water blocking agent can be injected from the inside. A rubber ring stopper 41 is provided on the tube end side of the joint portion 21, a ring 4 is provided at the intermediate portion at a width of each rubber ring, and a rubber joint for guiding the insertion of the collar portion is provided on the tube end side. Along with the ring 61, the joint rubber ring 6 is arranged on the far side away from the pipe end, and a water expansion joint rubber ring 62 is arranged between the joint rubber ring 61 and the joint rubber ring 6. It is characterized by doing. The invention according to claim 2 is characterized in that the injection hole 5 according to claim 1 is provided at a position between the rubber ring 6 for joint and the rubber ring 62 for water expansion joint. According to a third aspect of the present invention, the injection hole 5 of the first aspect is brought close to the pipe end, and the rubber ring 61 for joining is used.
And a rubber ring 62 for water expansion joint. The invention described in claim 4 is characterized in that the space B is filled with a fluid filler that expands by reacting with water from the injection hole 5 in the pipe of claim 1. Claim 5
The invention described in (1) is characterized in that at the time of curve construction according to the first aspect of the present invention, a lubricant that reduces friction when the rubber ring is bent and makes it slippery is injected from the injection hole 5 in the pipe into the space B. And The invention of the structure of a propulsion fume tube according to claim 6 is characterized in that the other end of the concrete propulsion fume tube 1a having a joint 21 with a reduced diameter at one end of the tube is anchored to the inner surface of the end. 16 and the anchor 16 is welded.
A water expansion ring is disposed closer to the end of the pipe, the outer periphery of the joint 21 is covered with an iron plate, and an injection hole 5 is provided in the joint 21 so that a lubricant or a water blocking agent can be injected from the inside. A rubber ring stopper 41 is provided on the tube end side of the tube 21, a ring 4 having the width of each rubber ring is provided on the intermediate portion, and a rubber ring 61 for joining which serves as a guide for inserting the collar portion is provided on the tube end side. Together with
The joint rubber ring 6 is arranged on the far side away from the pipe end, and a rubber ring 62 for water expansion joint is arranged between the joint rubber ring 61 and the joint rubber ring 6. Claim 7
The method for manufacturing a propulsion fume pipe according to the invention described in (1), has a joint 21 having a reduced diameter at one end of the pipe, and the joint 2
A hole 12a is formed at the injection hole 12 of the iron plate 2 of the propulsion fume tube 1 in which the entire outer peripheral surface of the tube 1 and the other tube is covered with the iron plate 2, avoiding the spiral reinforcing bar and the vertical bar, and the inner surface of the hole 12a. A cylindrical body 24 having a thread is welded, and a cylindrical body 17 having a cap fitted to an entrance is screwed to the cylindrical body 24.
It is characterized by centrifugal molding.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The structure of the fume tube for propulsion according to claim 1 of the present invention has a joint 21 having a reduced diameter at one end of the tube, and the joint 21 and the entire outer peripheral surface of the tube are made of an iron plate 2. The joint 21 of the propulsion fume tube 1 covered with
An injection hole 5 is provided so that a lubricant or a water blocking agent can be injected from the inside,
A rubber ring stopper 41 is provided on the tube end side of the joint portion 21, a ring 4 is provided at the intermediate portion at the width of each rubber ring, and a joint for guiding the insertion of the collar portion is provided on the tube end side. Rubber ring 6
1 and a rubber ring 6 for joint is disposed on the back side away from the pipe end, and a rubber ring 62 for water expansion joint is disposed between the rubber ring 61 for joint and the rubber ring 6 for joint. ing. In the invention described in claim 2, the injection hole 5 in claim 1 may be provided at a position between the joint rubber ring 6 and the water expansion joint rubber ring 62. According to a third aspect of the present invention, the injection hole 5 of the first aspect is characterized in that:
It may be provided near the pipe end and at a position between the joining rubber ring 61 and the water expansion joining rubber ring 62. According to a fourth aspect of the present invention, the space B may be filled with a fluid filler which expands by reacting with water from the injection hole 5 in the pipe of the first aspect. The invention according to claim 5 is a method according to claim 1,
A lubricant may be injected into the space B from the injection hole 5 in the pipe to reduce friction when the rubber ring is bent and make the rubber ring slippery. The invention of the structure of a propulsion fume tube according to claim 6 is characterized in that the other end of the concrete propulsion fume tube 1a having a joint 21 with a reduced diameter at one end of the tube is anchored to the inner surface of the end. A water expansion ring is arranged on the pipe end side of the anchor 16, the outer periphery of the joint 21 is covered with an iron plate, and a lubricant or a water blocking agent is injected into the joint 21 from inside. A hole 5 is provided, a rubber ring stopper 41 is provided on the tube end side of the joint 21, and a ring 4 is provided at an intermediate portion with a width of each rubber ring, and a collar portion is inserted on the tube end side. A joint rubber ring 61 serving as a guide is arranged, and a joint rubber ring 6 is arranged on the back side away from the pipe end, and a water expansion joint is provided between the joint rubber ring 61 and the joint rubber ring 6. Rubber ring 6
2 are arranged. In the above-described case, in the joint structure using the rubber ring and the collar, the rubber ring having three different functions and functions of the joining rubber ring 61, the joint rubber ring 6, and the water-expandable rubber ring 62 is connected to the joint portion. In this case, good bonding and flexibility and high nectarity can be ensured. In order to obtain a high degree of honey, the rubber ring must have a compressibility as uniform as possible in the circumferential direction of the pipe even when it is subjected to displacement at the joint of the pipe. Therefore, one so-called water-swellable rubber ring 62, which is slightly smaller and whose volume is expanded by water, is arranged between the two rubber rings of the joining rubber ring 61 and the joint rubber ring 6. In this structure, when bending occurs in the joint portion of the propulsion pipe due to uneven earth pressure or the like, the cross section of the water-expandable rubber ring 62 is slightly smaller than the other two rubber rings,
At the beginning of the displacement, the joining rubber ring 61 and the joint rubber ring 6, which are two rubber rings, mainly work to absorb the displacement,
When the displacement gradually advances, a load due to the displacement gradually acts on the water-expandable rubber ring 62, so that the water-expandable rubber ring 62 also maintains a gap B between the pipe and the collar, so that the repulsive force is large. Become. As described above, initially, the two rubber rings support the partial pressure, but the three rubber rings gradually resist the displacement, so that the flexibility of the joint portion is not greatly impaired. Since the compression ratios of the rubber rings 6, 61, and 62 are uniformly maintained above, high water honey can be obtained. Also, even if an excessive load acts on the three rubber rings 6, 61, 62, the compression ratio of the rubber rings 6, 61, 62 is reduced, and even if water enters the joint from outside the pipe, the two By the rubber ring for joining 61 and the water-swellable rubber ring 62 arranged between the rubber rings for joint 6,
The water-expandable rubber ring 62 expands in volume by reacting with the water that has entered, so that high water honey can be achieved. This water-expandable rubber ring 62 has a slightly smaller cross-sectional shape than the other two bonding rubber rings 61 and the joint rubber rings 6. Since it is surrounded by the rubber ring, it does not come into contact with water outside the pipe or water inside the pipe in a normal state, and therefore, the water-swellable rubber ring 62 may expand. Therefore, the flexibility of the joint portion is not significantly impaired. Generally, the resistance at the time of joining is almost determined by the largest rubber ring used. In this structure, the water-swellable rubber ring 62 disposed at the intermediate portion is
Since it is formed slightly smaller than 1, the resistance at the time of joining is
Since the leading joining rubber ring 61 does not become larger than the resistance force when it is inserted into the collar 23, good joining properties can be obtained. Furthermore, when the water-swellable rubber ring 62 disposed in the middle part of the joint is arranged close to one of the other two rubber rings, the bonding rubber ring 61 and the joint rubber ring 6, the water-swellable rubber ring 62 is short. The function of the rubber ring can be effectively exhibited even with the length of the joint. That is, one water-expandable rubber ring 6
Two adjacent rubber rings 61 and two joint rubber rings 6 adjacent to 2
A space B is provided between the space B and the injection hole 5 is used in the space B from the inside of the pipe.
In addition to the reinforcement of the water stoppage by 2, a flowable filler 8 of a urethane-based material which reacts with water and deposits and expands is injected. In the injection operation, when the first rubber ring, the middle water-swellable rubber ring, and the last rubber ring are arranged close to each other, the space formed between the first rubber ring and the middle water-swellable rubber ring is used. The filling 8 is injected into the part. Further, when the tubes are designed and bent by curve construction or the like, the rubber rings 6 and 61 are easily slipped,
In addition, it is preferable to inject a lubricant to make it easy to bend. Therefore, the rubber rings 6, 61 can be prevented from being worn by the friction at the time of bending. And in the case of the above-mentioned joint structure, the water pressure generated around 50m underground is 0.5MPa.
a (megapascal). As shown in FIGS. 6 to 10, the method for manufacturing a propulsion fume tube according to the invention of claim 7 includes a joint 21 having a reduced diameter at one end of the tube. And the entire outer peripheral surface of the pipe
A hole 12a is drilled at the injection hole 12 of the iron plate 2 in the propulsion fume tube 1 covered with
A threaded socket 24 is welded to the inner surface of the hole 12a, and a cylindrical body 17 with a cap fitted at the entrance is screwed to the socket 24 and then centrifugally molded. The iron plate 2 has a diameter substantially equal to the diameter of the opening hole, and is approximately 30 m.
The socket 24 having a length of about m is integrally attached to the iron plate, which is arranged in the formwork, and then the assembled reinforcing cage is put into the formwork, and the prepared socket 24 having a predetermined thickness is added. It is formed by casting concrete. As a result, since the iron plate 2 and the socket 24 are integrated, no separation occurs between the iron plate 2 and the concrete of the propulsion fume tube, so that there is no problem in construction in a place where the external water pressure is high. Further, since the socket 24 is divided, it is not necessary to cut the reinforcing bar of the reinforcing bar cage and put it into the cylinder of the iron plate 2, so that the opening of the injection hole 12 is not weakened in strength.

[0006]

As described above, the present invention has the following advantages. (1) In the joint structure using rubber rings and collars, three rubber rings with different functions and functions are arranged in the joints to ensure good jointability, flexibility, and high water honey can do. (2) The joint structure of the present invention can withstand a high water pressure of 0.5 MPa (megapascal) generated near 50 m underground. (3) Since the injection pipe of the injection hole is attached after the rebar is inserted, it can be set on the mold without cutting the rebar. Therefore, there is no reduction in strength caused by cutting the reinforcing bars.

[Brief description of the drawings]

FIG. 1 is a front view of a half cross-sectional view of a propulsion fume tube having an outer peripheral surface covered with an iron plate according to the present invention.

FIG. 2 is a right side view of a propulsion fume tube in which the outer peripheral surface of the present invention is covered with an iron plate.

FIG. 3 is a cross-sectional view of a joint part of a propulsion fume tube having an outer peripheral surface covered with an iron plate according to the present invention.

FIG. 4 is a sectional view of a joint portion according to another embodiment of the present invention.

FIG. 5 is a sectional view of a joint portion according to another embodiment of the present invention.

FIG. 6 is an explanatory view before forming in a method for manufacturing a propulsion fume tube according to the present invention.

FIG. 7 is an explanatory view of a state in which a tubular body is attached before molding in the method of manufacturing a propulsion fume tube according to the present invention.

FIG. 8 is a sectional view of a tubular body in the method for manufacturing a propulsion fume tube according to the present invention.

FIG. 9 is a sectional view of a main part of the method for manufacturing a propulsion fume tube according to the present invention.

FIG. 10 is an explanatory diagram from the inner side of the method for manufacturing a propulsion fume tube according to the present invention.

FIG. 11 is a cross-sectional view of a conventional propulsion fume tube using a single waterproof rubber ring. .

FIG. 12 is a cross-sectional view of a conventional fume tube using two rubber rings for stopping water. .

FIG. 13 is an explanatory diagram of a peeling and water leakage state in a conventional propulsion fume tube. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion fume tube 11 Main body 11a Spiral rebar 11b Vertical bar 12 Injection hole 13 Joint 14 Injection hole 15 Notch 16 Anchor 16a Reinforcement 17 Cylindrical body 18 Screw 19 Cap 2 Coated iron plate 21 Joint 22 Hole 23 Collar part 24 Socket 25 Welding Part 3 Cushion material 4 Ring 41 L-shaped stopper 5 Injection hole 51 Cylindrical part 52 Cap 6 Rubber ring for joint 61 Rubber ring for joint 62 Rubber ring for water expansion joint 7 Color W Inner frame

Claims (7)

[Claims] 1. An end portion of one side of the tube has a joint portion 21 having a reduced diameter, and the joint portion 21 and the entire outer peripheral surface of the tube are made of an iron plate 2.
An injection hole 5 is provided in the joint 21 of the propulsion fume tube 1 covered with the above so that a lubricant or a water blocking agent can be injected from the inside, and a rubber ring stopper 41 is provided on the tube end side of the joint 21. Along with
A ring 4 having the width of each rubber ring is provided in the middle portion, and a joining rubber ring 61 serving as a guide for inserting the collar portion is arranged on the tube end side, and a joint is provided on the far side away from the tube end. A propulsion fume tube structure comprising: a rubber ring 6 for disposition; and a rubber ring 62 for water expansion joining between the rubber ring 61 for joining and the rubber ring 6 for joint. 2. The structure of the fume tube for propulsion according to claim 1, wherein the injection hole 5 is provided at a position between the joint rubber ring 6 and the water expansion joint rubber ring 62. 3. The propulsion according to claim 1, wherein the injection hole is provided near the pipe end and provided between the joining rubber ring and the water expansion joining rubber ring. Fume tube structure. 4. The structure of a propulsion fume tube according to claim 1, wherein the space B is filled with a fluid filler which expands by reacting with water from the injection hole 5 in the tube. 5. The method according to claim 1, wherein at the time of curve construction, a lubricant is injected into the space B from the injection hole 5 in the pipe so as to reduce friction when the rubber ring is bent and to make it slippery. Structure of the propulsion fume tube described in the above. 6. An anchor 16 is welded to the inner surface of the other end of a concrete propulsion fume tube 1a having a joint 21 having a reduced diameter at one end of the tube.
A water expansion ring is disposed closer to the end of the pipe, the outer periphery of the joint 21 is covered with an iron plate, and an injection hole 5 is provided in the joint 21 so that a lubricant or a water blocking agent can be injected from the inside. A rubber ring stopper 41 is provided on the tube end side of the tube 21, a ring 4 having the width of each rubber ring is provided on the intermediate portion, and a rubber ring 61 for joining which serves as a guide for inserting the collar portion is provided on the tube end side. Together with
A propulsion characterized by disposing a joint rubber ring 6 on the far side away from the pipe end, and disposing a water expansion joint rubber ring 62 between the joint rubber ring 61 and the joint rubber ring 6. Fume tube structure. 7. One end of a tube has a joint 21 having a reduced diameter, and the joint 21 and the entire outer peripheral surface of the tube are covered with an iron plate 2
A hole 12a is formed at the injection hole 12 of the iron plate 2 in the propulsion fume pipe 1 covered with
A threaded cylindrical body 24 is welded to the inner surface of the hole 12a,
The cylindrical body 24 has a cylindrical body 17 with a cap fitted at the entrance.
And then centrifugally molding the screw.