JPH036713Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention Industrial application field This invention belongs to the field of constructing underground structures such as underground roads, water and sewerage systems, and public ditches by digging three cylindrical bodies into the ground.

BACKGROUND TECHNOLOGY A propulsion jack is interposed between three underground cylindrical bodies installed in succession at a launch base, and the front part of the connecting member through which the three cylindrical bodies are inserted is the front part of the first cylinder. It is fixed with a fixing device, and at the rear of the connecting member, it is fixed with a removable fixing device via forward jacking equipment.
The first cylinder moves forward by releasing the fixing device at the rear, and uses the total reaction force of the second and third cylinders as a reaction force to move it forward by the action of the first propulsion jack. The fixing device is attached, the first propulsion jack is shortened, the second propulsion jack is propelled, and the total reaction force of the first and third cylinders connected by the connecting member is used as a reaction force to move forward, and the third cylinder is moved forward. For forward movement, the second propulsion jack is shortened, the rear forward movement jack equipment is extended, and the total reaction force of the first and second cylinders connected by the connecting member is used as a reaction force to move forward, and the above operations are performed sequentially. The three cylinders were repeatedly advanced from the launch base into the ground.

Problems to be solved by the invention In the case of the above-mentioned conventional technology, the total resistance of the cutting edge resistance when the first cylindrical body digs into the ground and the frictional resistance of the earth and sand around the first cylindrical body is 1.The frictional resistance force on the bottom surface due to the weight of the second cylindrical body is greater than that of the second cylindrical body, and the second and third cylindrical bodies move backward. Therefore, either make the first cylindrical body shorter or shorter, or prevent the receding action of the cylindrical body. The above cylinder prevention equipment is required until the three cylinders advance underground, either by installing a propulsion facility (also known as a reaction wall) at the rear of the third cylinder, or by using a towing member, earth anchor, etc. from the front of the launch base. It was. These cylindrical body regression prevention devices have the problem of increasing labor and construction costs.

(b) Means for solving the structural problems of the invention From the front of the three cylinders constructed according to the above-mentioned conventional technology, detachable jack fittings are attached to both sides of the second and third cylinders. At the same time, a support jack is attached so as to face diagonally backward, and a reaction force receiving member with a continuous mountain-shaped protrusion parallel to the side surface of the cylinder is installed on both sides of the starting base, and this reaction force receiving member supports both sides of the cylinder. The jack is extended and supported to prevent the second and third cylindrical bodies from retreating.

Function: In the process of digging the first cylinder into the ground using the device of the present invention, the fixing device at the rear of the forward jack equipment is released to free the connecting member, and then the first cylinder is moved to the second and third cylinders by the first propulsion jack. The total reaction force of the reaction force due to the friction of the cylinder's own weight and the support reaction force due to the extension of the support jacks installed on both sides of the second and third cylinders is the frictional resistance of the surrounding earth and sand of the first cylinder and the cutting of the cutting edge. Since it is much stronger than the sum of the resistances, it is possible to easily make the first cylindrical body dig.

The advancement of the second cylindrical body releases the first support jack and the first propulsion jack, and the support reaction force due to the extension of the second support jack and the first and third cylindrical bodies integrally connected by the connecting member. The second propulsion jack is actuated using the total reaction force as a reaction force to advance the second cylindrical body.

Next, the third cylinder moves forward by releasing the second propulsion jack and the second support jack, and the sum of the support reaction force of the reaction force receiving member due to the extension of the first support jack and the reaction forces of the first and second cylinders. The forward jacking equipment is operated using the reaction force as a reaction force to advance the third cylindrical body.

If the following fourth cylinder is required at the starting base after the above operation has been repeated one cylinder forward by one cylinder length, the fourth cylinder is installed and the forward jacking equipment etc. is transferred to the rear of the fourth cylinder at the same time. A third propulsion jack is interposed between the third and fourth cylinders, and the first support jack etc. are re-interposed in the fourth cylinder, and the above action is repeated, causing the cylinder to retreat as the cylinder moves forward. When this is no longer possible, the supporting jacks, etc. are removed and the cylinders are dug into the ground using only conventional techniques.

Embodiment An embodiment of the device of the present invention will be described with reference to the drawings.

The first, second and third cylindrical bodies 1 ₁ , 1 ₂ , 1 ₃ are disposed in tandem in succession in the starting base 10 from the front.
A connecting member 2 is connected between each of the cylinders 1 ₁ , 1 ₂ , 1 ₃ and the forward jack equipment 4 attached to the rear of the third cylinder 1 ₃ .
is fixed to this connecting member 2 at the front part of the first cylindrical body ₁ with the fixing device 3, and the forward jacking equipment 4
It is fixed by a detachable fixing device 3' at the rear, and first and second propulsion jacks ₆₁ , ₆₂ are interposed from the front between each cylinder ₁₁ , ₁₂ , ₁₃ , and the second, Third cylindrical body 1 ₂ ,
First _and second support jacks 9 ₁ and 9 ₂ are attached to the rear of both outer surfaces of the tube 1 3 via removable jack mounts 8 in the direction diagonally rearward of the cylindrical side surface. A reaction force receiving member 7 having a continuous mountain-shaped protrusion is installed on the inner surface of the starting base parallel to the side surface of the cylinder, and the support jack 9 ₁ ,
At step 9 ₂ , the reaction force receiving member is used as a reaction force to prevent the second and third cylindrical bodies 1 ₂ and 1 ₃ from retreating. In addition,
Reference numerals 7', 7'', 8', 8'', 9', 9'' and 9 indicate the mounting bolts, nuts, and mounting plates of the jack mount, reaction force receiving member, and support jack.

The step of excavating and advancing the first cylindrical body 1 ₁ into the ground is as follows:
The fixing device 3' at the rear of the forward jack equipment 4 is released to free the connecting member 2, and the reaction force of the reaction force receiving member 7 supported by the operation and extension of the first and second support jacks 9 ₁ and 9 ₂ is , the total reaction force of the third cylindrical bodies 1 ₂ and 1 ₃ is much greater than the sum of the cutting resistance of the cutting edge 5 on the front surface of the first cylindrical body 1 ₁ and the frictional resistance of the earth and sand surrounding the first cylindrical body 1 ₁ Since this becomes a strong reaction force, the first cylindrical body 1 ₁ is easily moved forward by excavation by the first propulsion jack 6 ₁ .

The forward movement of the second cylindrical body ₁₂ is achieved by releasing the first propulsion jack ₆₁ and the first support jack ₉₁ , fixing the fixing device 3' at the rear of the forwarding jack equipment 4 to the connecting member 2, and The total reaction force of the reaction force of the frictional resistance of the surrounding earth and sand of the first cylinder 1 ₁ and the self-weight reaction force of the third cylinder 1 ₃ is generated by connecting the cylinders ₁ 1 and 1 ₃ with the connecting member 2. 2
The second cylindrical body 1 ₂ is advanced by the second propulsion jack 6 ₂ using the total reaction force of the support reaction force of the reaction force receiving member 7 due to the extension of the support jack 9 ₂ as a reaction force.

The front of the third cylindrical body 1 ₃ releases the second propulsion jack 6 ₂ and the second support jack 9 2 , and the support reaction force of the reaction force receiving member 7 due to the extension of the first support jack 9 ₁ and the first and second propulsion jacks 9 ₂ are released. The third cylindrical body 1 ₃ is advanced via the connecting member 2 in the forward jacking equipment 4 using the total reaction force of the two cylindrical bodies 1 1 and _{1 2 as} a reaction force.

Repeat the above work steps sequentially to create the first, second,
Advance the third cylinder into the ground.

Once the three cylinders have been dug into the ground, the total reaction force of the other two cylinders is used as a reaction force to alternately move the cylinders forward one by one using conventional construction methods.

C. Effects of the invention The following are the major effects of the device of the invention.

Conventionally, when multiple cylinders are excavated into the ground from a starting base in sequence, it is impossible to dig the cylinders due to a retreat phenomenon of the rear cylinder due to insufficient reaction force generated at the initial stage. There were many. As a countermeasure for this, for example, you can build a reaction wall at the rear of the launch base and use the propulsion method, or you can build a small guide shaft in front of the cylinder and build reaction equipment in front of it and use a towing tool to move the cylinder. They had installed restraints to prevent the body from returning, built underground reaction force equipment using earth anchors, or built retention equipment, modified the launch pad in the launch base, or constructed ground reaction force equipment mechanisms. Both methods had the serious disadvantage of requiring large-scale equipment, high construction costs and long construction times, and being limited to the site.

However, in the device of the present invention, the structure is such that the support jacks are removably mounted diagonally rearward on both sides of the second and third cylinders from the front of the group of cylinders disposed at the starting base. It has a simple structure in which it is supported by a support jack on the reaction force receiving member on the side of the cylinder, and can be easily attached and detached using bolts and nuts, and can be easily reused after the fourth cylinder. This method eliminates the reaction force that occurs at the initial stage when a group of cylinders is sequentially dug into the ground from a starting base using simple equipment, without employing various extremely uneconomical reaction force reinforcement equipment, which is a disadvantage of the conventional method. It is a device that can easily solve the major drawback of not being able to dig due to the backing of the rear cylinder due to lack of force, and once this standard device is manufactured, it can be reused in any location, and from the next generation onwards. There is no production cost and only the installation cost is required. Moreover, no damage is caused to the cylinder, and there is no need to replace the jack mount.

Therefore, the device of the present invention is extremely economical, easy to operate, convenient, safe, and technically excellent.

[Brief explanation of the drawing]

1, 3 to 6 are plan views showing the steps of one embodiment of the present invention. FIG. 7 is a detailed plan view of the device. Figure 2 is a sectional view. Code, 1 ₁ , 1 ₂ , 1 ₃ , 1 ₄ ...first, second, third, fourth cylinder, 2 ...connection member, 3, 3' ...fixer, 4 ...forward jacking equipment , 5...blade mouth, 6
₁ , 6 ₂ , 6 ₃ ...first, second, third propulsion jacks,
7... Reaction force receiving member, 8... Jacket fixture, 9 ₁ ,
9 ₂ ...First and second support jacks, 10...Starting base.

Claims (1)

[Scope of utility model registration request] A propulsion jack is interposed between each of the three underground cylinders that are successively arranged in tandem at the launch base, and a fixing device is used at the front of the first cylinder in front of the connecting member through which the three cylinders are inserted. At the rear of the connecting member, it is fixed with a removable fixing device via a forward jacking device attached to the rear of the third cylinder, and at the same time, a removable fixing device is installed on both sides of the second and third cylinders. An initial stage of an underground cylinder consisting of a support jack mounted obliquely rearward to the side of the cylinder, and a reaction force receiving member parallel to the side of the cylinder and having continuous mountain-shaped protrusions on the side of the starting base. Starting device.