JP2001303888A - Leading pipe used for pipe jacking method and molding method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a leading pipe enabling long-distance execution in a pipe jacking method for burying a pipe body in the ground. SOLUTION: In the pipe jacking method, the leading pipe A disposed for connection to the front end of a Hume pipe following an advancing machine for excavation is composed of as thick a concrete pipe part 1 as the Hume pipe or more, having the same inner diameter as the following Hume pipe, and a steel pipe 2 with a prescribed thickness, integrated closely with the outer periphery of the pipe part 1. A spigot 3 of a concrete pipe is formed one side of an axial direction, and a collar 4, made of a steel pipe, for receiving the spigot 3 of the following Hume pipe is formed on the other side thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head pipe used in a propulsion method for burying a pipe such as a sewer pipe or a gas pipe in the ground and a molding method thereof. The present invention relates to a method for forming the leading tube.

[0002]

2. Description of the Related Art When a pipe is buried in the ground, a propulsion pipe (fume pipe) is sequentially inserted into the excavator through a head pipe while excavating the ground from a starting shaft to a reaching shaft. A propulsion method is adopted in which it is followed and pushed forward.

In this propulsion method, the outer peripheral surface of the propulsion pipe is directly
The outer diameter of the excavator must be reduced because it may be damaged due to contact with the excavation ground, or the frictional resistance between the propulsion pipe and the excavation wall surface may increase, making it difficult to propel the propulsion pipe and making long-distance construction impossible. The gap between the inner peripheral surface of the excavation ground excavated by the excavator and the outer peripheral surface of the propulsion pipe, which is larger than the outer diameter of the propulsion pipe,
The propulsion pipe is buried between the starting shaft and the reaching shaft by propelling while injecting and filling the lubricating material from the injection port formed on the peripheral wall of the propulsion pipe. However, since the sliding material is a liquid material obtained by adding water to bentonite or a polymer, in a sandy ground or the like, the injected sliding material permeates the ground and is dissipated. For this reason, in sandy ground, etc., first, a hardening material such as mortar is injected to cover the excavation wall surface, and the lubricating material is injected between the coated hardened body surface and the outer peripheral surface of the fume pipe while propelling. The so-called two-layer injection propulsion method is used.

[0004]

However, in the above two-layer injection propulsion method, the curable material is injected from the outer periphery or the rear end of the excavator. In the former case, the curable material is sufficient to cover the excavation wall surface. A thick cured body layer cannot be obtained, and the dissipation of the lubricant cannot be sufficiently prevented. In the latter case,
There is a problem in that the cured body layer becomes thick and a space for filling the lubricant cannot be sufficiently secured, and the frictional resistance during propulsion cannot be reduced until it is satisfied.

[0005] The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a leading pipe which enables long-distance construction. Another object of the present invention is to establish a molding method capable of easily manufacturing a head tube achieving the above object while maintaining high quality.

[0006]

The technical means taken by the present invention to achieve the above object is to secure a filling space for the curable material to be injected, and to form an inner mold until the curable material is cured. The top tube has a function as a frame and can secure a space for filling with a lubricant. The specific configuration of the leading pipe is such that the inner diameter is the same as the inner diameter of the subsequent fume pipe (propulsion pipe), and the outer diameter is smaller than the outer diameter of the excavator and larger than the outer diameter of the fume pipe. It is characterized by comprising. Further, the top pipe has a concrete portion whose inner diameter is the same as the inner diameter of the subsequent fume pipe and whose wall thickness is equal to or greater than the thickness of the fume pipe, and a steel pipe section of a predetermined thickness which is tightly integrated with the outer periphery of the concrete section. The spigot of the concrete part is formed on one side in the axial direction, and a steel collar for receiving the spigot of the following fume tube is formed on the other side.

[0007] An injection hole for a curable material penetrating inside and outside is formed in the peripheral wall of the leading tube. The number of injection holes for the curable material may be one or more. However, in order to reduce the resistance during propulsion, it is preferable to open a large number of injection holes for the curable material along the circumferential direction. Further, the collar of the above-mentioned leading pipe may be a steel pipe portion alone, or may be a double structure in which a metal band ring is laminated on the inner peripheral surface of the steel pipe portion.

Further, by forming the above-mentioned head tube using a centrifugal molding method, it is possible to form a head tube in which a steel pipe portion (outer layer) and a concrete portion (inner layer) are tightly adhered and integrated. That is, a cas is attached to the front and rear edges in the axial direction of a steel pipe portion having an outer diameter larger than the outer diameter of the fume pipe, and the front and rear cass are placed on a driving wheel and rotated to supply a cement material into the rotating steel pipe. Then, the concrete part is tightly integrated with the inner surface of the steel pipe part, and after molding, the front and rear cass are removed to obtain a leading pipe. And
By providing an anchor on the inner surface of the steel pipe part, the steel pipe part and the concrete part can be more tightly integrated with each other. Further, the forming of the head pipe is not limited to the method of applying the centrifugal forming method, and a member obtained by dividing the steel pipe portion into a plurality (for example, two parts) along the circumferential direction is put on the outer periphery of the concrete portion. They may be connected to each other so as to be laminated and integrated.

According to the above-described means, a space for filling the curable material to be injected is secured, and a function as an inner mold frame until the curable material is cured is provided. Can be secured. And since the outer diameter of the leading pipe leading pipe is at least larger than the outer diameter of the fume pipe following the leading pipe and smaller than the outer diameter of the excavator,
It is possible to reduce the contact between the outer peripheral surface of the fume pipe to be pressed and pushed and the inner peripheral surface of the ground excavated by the excavator. Thereby,
Since resistance during propulsion can be reduced, long-distance construction of propulsion work can be realized. Further, since the inner diameter of the leading pipe is the same as the inner diameter of the fume pipe that follows, it can be used as it is as a buried pipe and is economical. According to the second aspect, since the outer layer is a steel pipe, the friction with the hardening material (primary lubricant) injected from the injection hole or the excavator side of the front pipe is smaller than that of the concrete front pipe, Propulsion work can be performed more smoothly, and a cured body layer having an appropriate thickness can be formed without breaking the cured inner peripheral surface of the curable material. Furthermore, since it is a laminated structure of a concrete part and a steel pipe part, floating due to buoyancy when a sliding material is injected can be prevented as compared with a head pipe made only of concrete or steel pipe. Therefore, it is possible to reduce the contact of the leading pipe with the excavated ground during propulsion.

According to a fourth aspect of the present invention, the collar into which the spigot of the subsequent fume tube is inserted has a double structure made of a steel member, so that the projection of the collar is made thicker. It is possible to increase the waterproofness of a fume pipe connection having a spigot smaller than the outer diameter of the concrete part by a simple manufacturing process without special processing. Further, when the head pipe is formed by the forming method described in claim 5, a head pipe in which the outer steel pipe and the inner concrete pipe are tightly adhered and integrated can be efficiently produced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a leading pipe A arranged and connected to the leading end of a fume pipe B following an excavator. This leading pipe A is formed of a concrete part 1 of an inner layer and an outer layer by a forming method applying a centrifugal forming method described later. The steel pipe portion 2 is configured to be closely adhered and integrated.

The inner concrete portion 1 is formed in a tubular body whose inner diameter is the same as the inner diameter of the subsequent fume tube B and whose wall thickness is equal to or larger than the wall thickness of the fume tube B. On one side, a spigot (connecting portion) 3 to be inserted and connected to the rear portion of the excavator C is integrally formed.

The steel pipe part 2 tightly integrated with the outer peripheral surface of the concrete part 1 is a steel pipe of a predetermined thickness having a strength enough to withstand the earth pressure, for example, a steel pipe having a thickness of 15 mm. Used, the outer diameter is smaller than the outer diameter of the excavator C, and the length in the axial direction is substantially the same as the length of the concrete part 1 described above. The steel pipe portion 2 has one end in the axial direction aligned with the rear end of the spigot 3 of the concrete portion 1, so that the other end of the steel pipe portion 2 extends and protrudes in the axial direction from the other end of the concrete portion 1. A collar 4 for receiving the spigot 5 of the fume tube B is formed. That is, the outer diameter D1 of the leading pipe A is configured to be larger than the outer diameter D2 of the subsequent fume pipe B and smaller than the outer diameter of the excavator C.

In addition, a plurality of hardening material injection holes 6 penetrating inside and outside penetrate in the circumferential direction at the peripheral wall near the spigot 3 in the leading pipe A having a laminated structure of the concrete part 1 and the steel pipe part 2. Has been established. Further, the steel pipe portion 2
The metal band-shaped ring 7 is fitted and laminated on the inside of the collar 4 portion to be integrated, and the water stopping property with the subsequent fume tube B is improved. Further, an anchor 8 is fixed to the inner surface of the steel pipe 2 to strengthen the connection and integration between the inner concrete part 1 and the steel pipe 2. And the top tube A
In the peripheral wall of the fume tube B, which will be described later, a lubrication material injection hole penetrating inside and outside is formed.

As shown in FIG. 2, the spigot 3 of the head tube A is inserted into the rear part of the excavator C and connected to the head tube A constructed as described above.
The spigot 5 of FIG. Then, the curable material is filled into the voids on the peripheral surface of the head tube, and the head tube moves forward with the propulsion, and is hardened while passing, forming a hardened layer. Then, a lubricant is injected into the gap between the hardened layer and the fume tube. The curable material may be a mortar obtained by kneading cement and sand, or a material obtained by adding bentonite to this mortar, or a mixture of water glass and sand. Any material can be used as long as it cures after a certain period of time.
It is preferable to mix the mortar with the bentonite because the mortar easily flows in the pipe or the hose at the time of injection. For the injection of the curable material, a mixer (not shown) is installed in a shaft and supplied to an injection pipe by driving a pump. Examples of the lubricant include a highly viscous aqueous solution mainly composed of fats and oils and bentonite, and a spherical shape obtained by adding water to a highly absorbent polymer (for example, an acrylic acid / vinyl alcohol copolymer) which becomes a spherical elastic body when absorbing water. An elastic body or the like is used.

FIG. 3 is a process chart showing a manufacturing process of the leading tube A described above. The well-known centrifugal molding of fume tubes,
Casings connected and fixed on both sides in the axial direction of a cylindrical mold (mold) are placed on a driving wheel, and cement is put into a mold rotating by driving the driving wheel, so that the cement is applied to the inner surface of the mold. The concrete pipe (fume pipe) is formed by adhering to a uniform thickness and removing the molding layer from the mold. The manufacturing method of the present invention makes the mold in the centrifugal molding method separable from the cas, uses a steel pipe constituting an outer layer in the mold, tightly integrates a concrete layer attached to the inner surface of the steel pipe, and removes the cast from the cast. What separates.

Step (a) is a process of assembling the form, and the leading tube A
Casings 9 on both sides in the axial direction of the steel pipe portion 2 constituting the outer layer of
Connect 9 '. An anchor 8 may be fixed to the inner surface of the steel pipe portion 2 in order to strengthen the tight integration with the concrete layer formed on the inner surface of the steel pipe portion 2. The cas 9 attached to one side of the steel pipe 2 has a step formed on the inner surface so as to constitute the spigot 3 of the concrete pipe, and the other cas 9 ′ determines the side end of the concrete section 1 and at the same time determines the side end of the concrete section 1. It is configured to form a collar 4 consisting only of a steel pipe portion 2 extending in the axial direction from the end.

Step (b) is a step of forming the concrete portion 1. The steel tube portion 2 with the cass 9, 9 'attached to both sides in the axial direction is placed on the driving wheel 10, and the cast wheels 9, 9' are placed on the driving wheel 10.
0 is driven to rotate the steel pipe portion 2, and the concrete material a adjusted to a predetermined flow state is placed in the rotating steel pipe portion 2.
And a concrete layer having a predetermined thickness is formed.

The step (c) is a step of separating the steel pipe and the cas of the formwork. The cass 9 and 9 ′ on both sides are removed while the concrete part 1 having a predetermined thickness is tightly integrated with the inner surface of the steel pipe part 2. Obtain tube A. The step (d) is a collar part forming step in which a metal band ring 7 is fixed to the inner surface of the collar 4 of the steel pipe part 2 by polymerization. In addition, a plurality of injection holes 6 for the curable material are formed on the peripheral wall near the spigot 3 at intervals in the circumferential direction, and the formation of the injection holes 6 for the curable material is performed in step (a). A hole is formed in a predetermined position of the steel pipe part 2 used as a steel pipe, a core is inserted into the hole from the inside of the steel pipe and is projected inside the steel pipe, and an injection hole is formed by charging the concrete material in the step (b), or After the step (d), an injection hole for the curable material may be opened with a drill or the like. If the outer diameter of the concrete portion is the same as the outer diameter of the fume tube, the molding device used for manufacturing the fume tube can be used as it is, which is economical.

FIG. 4 shows another method of forming the leading tube A,
(A) shows a semicircular outer layer member 2a, 2b obtained by dividing a steel pipe into two parts on the outer peripheral surface of a concrete part 1 previously formed by a centrifugal molding method or the like, and a bracket 12 attached to the outer layer member 2a, 2b. The members are fastened to each other with a fastener 11 such as a bolt and a nut so as to be in close contact with the outer peripheral surface of the concrete portion 1, and the butted edges of the outer layer members 2a and 2b are connected by welding. The concrete part 1 and the outer layer member 2
The outer peripheral surface of the concrete portion 1 or the outer layer members 2a and 2
It is more effective to apply an adhesive to the inner surface of b or both. After connecting the outer layer members 2a and 2b to form an annular shape, the bracket 12 to which the fastener 11 is attached is cut off from the outer layer members 2a and 2b as shown in FIG. In the above embodiment, the head pipe has been described as a synthetic pipe including a concrete part and a steel pipe part. However, the present invention is not limited to this, and the head pipe may be made of only concrete or steel pipe. Although the injection hole of the curable material has been described as being opened in the leading pipe, the present invention is not limited to this. For example, the injection hole may be injected from the outer periphery or the rear end of the excavator. Furthermore, although the description has been made assuming that one head tube is provided, the present invention is not limited to this, and a plurality of head tubes may be provided continuously. In addition, the present invention includes an excavator in which the rear end is stepped down to have a small diameter and the same as the outer diameter of the leading pipe.

[0021]

According to the first and second aspects of the present invention, the leading pipe used in the propulsion method according to the present invention has an outer diameter larger than at least the outer diameter of the fume pipe following the leading pipe.
Since the diameter is smaller than the outer diameter of the excavator, it is possible to reduce the contact of the outer peripheral surface of the fume pipe to be pressed and pushed with the inner peripheral surface of the ground excavated by the excavator. Accordingly, resistance during propulsion can be reduced, and long-distance construction of propulsion work can be realized. According to the third aspect of the present invention, since the outer layer is a steel pipe, a lubricating material (primary lubricating material) to be injected from an injection hole of the head pipe compared with a conventional concrete pipe head pipe.
Friction with the vehicle and the propulsion operation can be performed more smoothly. Furthermore, since it is a laminated structure of a concrete pipe and a steel pipe, it is possible to prevent floating due to buoyancy when a sliding material is injected, as compared with a head pipe made only of a concrete pipe or a steel pipe. Therefore, it is possible to reduce the contact of the leading pipe with the excavated ground during propulsion. Further, with the configuration described in claim 4, it is possible to enhance the water stoppage of the subsequent fume pipe connection. Further, according to the forming method described in claim 5, it is possible to efficiently produce a head pipe in which the outer steel pipe and the inner concrete pipe are tightly adhered and integrated.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a leading tube according to the present invention.

FIG. 2 is an explanatory diagram showing a connection use mode of a leading tube.

FIG. 3 is an explanatory view showing a method of forming a leading tube.

FIG. 4 is an explanatory view showing another method of forming the leading pipe.

[Explanation of symbols]

 A: Top pipe B: Fume pipe 1 ... Concrete pipe section 2 ... Steel pipe 3 ... Spigot 4 ... Collar 6 ... Lubricant injection hole 7 ... Strip ring 8 ... Anchor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Masao Okabe, Inventor 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka Prefecture Inside Okumura Gumi Co., Ltd. (72) Shunzo Azumi 2-chome, Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka No.2 No.2 Okumura Gumi Co., Ltd. (72) Hiroshi Shiratori 1-5-15 Uesugi, Aoba-ku, Aoba-ku, Sendai-shi, Miyagi F-term in the Tohoku branch of T-FU Corporation (reference) 2D054 AC18 AD22 AD28 FA12 4G058 AA01 AB01 AC13 AE12 AF06 BA01 BA13 EA32 EA41

Claims (5)

[Claims] In the propulsion method, a leading pipe arranged and connected to a leading end of a fume pipe following an excavator, wherein the leading pipe has the same inner diameter as an inner diameter of a subsequent fume pipe and an outer diameter of the leading fume pipe. A leading pipe used in a propulsion method, wherein the leading pipe has a diameter smaller than the outer diameter of the excavator and larger than the outer diameter of the fume pipe. 2. A concrete part having an inner diameter equal to the inner diameter of a subsequent fume pipe and having a thickness equal to or greater than the thickness of the fume pipe, and a predetermined thickness which is tightly integrated with an outer periphery of the concrete part. 2. A head pipe used in the propulsion method according to claim 1, wherein the steel pipe part comprises a steel collar for receiving a spigot of a concrete part on one axial side and a spigot of a succeeding fume pipe on the other side. 3. The head pipe used in the propulsion method according to claim 1, wherein an injection hole of a curable material penetrating inside and outside is formed in a peripheral wall of the head pipe. 4. The propulsion method according to claim 1, wherein the collar in the leading pipe comprises a steel pipe part and a metal band ring fixed to the inner peripheral surface of the steel pipe part. Head tube. 5. A steel pipe having an inner diameter larger than the outer diameter of the fume pipe, a cascade is attached to the front and rear edges in the axial direction, and the front and rear cass are put on a driving wheel and rotated, and a cement material is poured into the rotating steel pipe. A method of forming a leading pipe for use in a propulsion method, comprising supplying and centrifugally forming a concrete pipe portion to be tightly integrated with the inner surface of a steel pipe, and removing the front and rear cass to obtain a leading pipe after forming.