JP3751222B2 - Bucking prevention device and propulsion pipe for backing prevention - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and a propulsion pipe that prevent backing of a propulsion pipe row that is pushed back to a start shaft when a pipe is connected during propulsion in a propulsion method in which a propulsion pipe is buried in the ground.
[0002]
[Prior art]
In the propulsion method, the excavator and the excavator are pushed by pressing the rear end of the propulsion pipe row with a main push jack installed in the start shaft while cutting the ground with the face plate of the excavator set at the tip of the propulsion pipe row. In general, a method of burying the propelling pipe at a predetermined position is often used. Installation of the propelling pipe during propulsion construction is completed once the propulsion pipe has been buried, the main jack is reduced, and the next propulsion pipe is installed and installed in the space formed between the propelling pipe and the main jack. A method is used in which the rear end of the propulsion pipe is pressed with a main jack to connect to the previous propulsion pipe. However, under soil conditions with high groundwater pressure and earth pressure, large water pressure and earth pressure act on the faceplate at the tip of the excavator, and when the main jack is reduced, the propulsion pipe row that follows the excavator moves behind the starting shaft. Backing will be pushed back to the side. For this reason, there is a problem that there is no space for installing the next propulsion pipe, or that the water stop rubber on the start-up entrance wall reverses due to the removal of the propulsion pipe and the water stoppage disappears, causing groundwater and earth and sand to erupt into the shaft. Was.
[0003]
For this reason, anchor bolts are embedded on both sides of the propulsion pipe, and the anchor provided on the start shaft wall is fastened and fixed with a wire or steel, thereby preventing the propulsion pipe from backing due to the shearing force of the anchor bolt. Is commonly used.
[0004]
[Problems to be solved by the invention]
The above-described backing prevention technology is effective in propulsion work with a shallow earth covering and a small diameter of the propulsion pipe because the backing force is relatively small, but it is effective for fixing the anchor bolt to the outer wall of the propulsion pipe. It is necessary to embed and install a large number of anchors, which complicates the work for producing the propulsion pipe. Also, during propulsion work, anchor bolts are attached to the anchors on the outer wall of the propulsion pipe before the main push jack is reduced, and are fastened with anchors and wires, etc. provided on the starting vertical wall, and then the main push jack is reduced. It is a complicated work to hang the next propulsion pipe in that space, remove the wire after connecting with the previous propulsion pipe, and remove the anchor bolt attached to the outer wall of the propulsion pipe, and the time it takes to embed the propulsion pipe Was significantly reduced. In particular, when the propulsion pipe has a large diameter or a relatively large backing force acts, the number of anchor bolts increases, and it takes time to install and remove the anchor bolts, so that it does not take time to embed the propulsion pipe. Problems also arise. Furthermore, since the force of the anchor bolt acts on the anchor portion of the outer wall of the propelling pipe, there is a problem that the outer wall is damaged.
[0005]
For this reason, the present invention provides a backing prevention device and a backing pipe for preventing backing that can efficiently and easily prevent backing of the thrust pipe without damaging the outer wall of the thrust pipe.
[0006]
[Means for Solving the Problems]
That is, the present invention is a device for preventing the backing of the propelling pipe row being pushed back into the start shaft by the water pressure or earth pressure acting on the excavator face plate at the tip when the propelling pipe is connected during propulsion construction,
A pair of support materials installed so as to face both side surfaces of the propulsion pipe in front of the start shaft,
Equipped on the inside of the pair of support members, and a holding fitting that is curved along the outer periphery of the propulsion pipe,
A tension material for fastening the pair of support materials at a plurality of locations;
It is a backing prevention apparatus comprised with the fixing material which fixes the said pair of supporting material so that it may not move to the back of a propulsion direction.
Also, a propelling pipe that prevents backing using the backing preventing device described above,
It is a propulsion pipe for backing prevention provided with a concave portion in a ring shape so that the pressing metal fitting of the support material can fall in front of the steel collar behind the propulsion pipe.
[0007]
The support material needs to have a relatively high strength in order to press-contact the outer periphery of the propulsion tube with a presser fitting, and a steel material such as H-shaped steel is used. The length of the support material is made longer than the outer diameter of the propulsion tube in order to tighten at the upper part of the propulsion tube. The presser fitting provided on the support member is manufactured by being curved along the outer periphery of the propulsion pipe, and has a predetermined length in the circumferential direction to evenly distribute the tightening force from the support member. A large frictional force can be generated by attaching a rubber material to the contact surface of the presser fitting.
[0008]
The tension material is fastened and fixed with a holding fitting around the outer periphery of the propulsion pipe by pulling a pair of support materials inward. As the tension means, a conventional apparatus such as a tension with a PC steel material or a chain block may be used. Tensile materials are installed at two locations, upper and lower, that do not interfere with the propulsion pipe.
The fixing member is arranged and fixed behind the support member so that the pair of support members do not move rearward in the propulsion direction. As a fixing method of the fixing material, a method of supporting from the rear side of the start shaft wall by a support material on both sides of the propulsion pipe, a method of supporting by an anchor provided in front of the start shaft wall, or the like may be adopted. As the fixing material, it is necessary to support a relatively large backing force, and a strong H-type steel material or the like is used.
[0010]
The concave portion provided behind the propulsion tube may be manufactured by welding a ring-shaped cylinder so as to be inscribed in the inner surface of the steel collar, or may be an integrated structure obtained by processing the steel collar. The propulsion tube for preventing backing having a concave portion is not limited to a reinforced concrete tube, and can be used for all propulsion pipe materials such as a synthetic steel pipe and a steel pipe.
[0011]
When the propulsion construction of one propulsion pipe is completed, the outer periphery of the propulsion pipe is tightened with a pressing metal fitting by pulling the pair of support materials inward by a tension means such as a PC steel material provided on the upper portion of the support material. For this reason, the propulsion tube is restrained and fixed by the frictional force of the presser fitting. Then, the main pushing jack is reduced to secure a space between the rear end of the propulsion pipe and the head of the main pushing jack, and the next propulsion pipe is suspended and installed. When the installation is completed and the rear end of the next propulsion pipe is pressurized with a push jack to complete the connection of the propulsion pipe, the support member tensioning means is released and the propulsion pipe is not restrained. And the propulsion embedding of the next propulsion pipe is resumed. Further, by providing the recess behind the propulsion tube, the force for fixing and holding the propulsion tube becomes a frictional force and a shearing force, and a very large backing preventing force can be obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view for explaining a backing preventing apparatus of the present invention. The propulsion pipe 1 installed in the start shaft is supported and fixed by a pair of rail members 8 provided below both side surfaces of the propulsion pipe 1, and propulsion is buried in a planned direction. A pair of support members 2 that are higher than the outer diameter of the propulsion tube 1 are installed on both side surfaces of the propulsion tube 1. On the inner side of the pair of support members 2, a pressing metal fitting 3 that is curved along the outer periphery of the propulsion pipe 1 is provided. A fixing member 6 is installed on the upper rear part of the pair of supporting members 2 so as to come into contact with the supporting member 2, and both ends thereof are fixed to the start shaft 18. A fixing member 6 is installed in a lower part of the rear of the support member 2 so as to contact the support member 2, and both ends thereof are fixed to the start shaft wall 18 and the rail member 8. Above and below the pair of support members 2, tension members 4 such as PC steel materials are installed through the support member 2, and both ends thereof are fixed by a fixture 5 such as a nut. By installing the tension jack 7 between the support material 2 and the fixture 5 at one end of the upper tension material 4, the tension material 4 can be efficiently tightened or loosened.
[0013]
In the present embodiment, the method of using the tension jack 7 for tightening the tension material 4 is disclosed, but a method of directly tightening or loosening the fixtures 5 at both ends can also be used.
The tension material 4 changes the number of used and the diameter according to the backing force calculated in advance.
[0014]
The pair of support members 2 and the fixing member 6 are made of steel material such as H-type steel having a relatively high strength in order to withstand a large backing force.
[0015]
A rubber material is attached to the portion of the presser fitting 3 mounted on the pair of support members 2 so as to be in contact with the propulsion tube 1, so that the transmission of the tension force from the support material 2 can be made uniform. The frictional force can be increased.
[0016]
FIG. 2 is a plan view for explaining the backing preventing apparatus of the present invention. A pair of support members 2 are provided behind the start pit wall 9 provided on the front face of the start shaft so as to face both side surfaces of the propulsion pipe 1. The pair of support members 2 is provided with a tension member 4 that penetrates the support member 2 and is fixed at both ends with a fixture 5. Behind the pair of support members 2, a fixing member 6 is fixed to the start shaft walls 18 on both sides so as to contact the support member 2. Reinforcing members 19 that support the fixing material from the start shaft wall 18 are attached to both ends of the fixing material 6.
[0017]
Although the embodiment in which the reinforcing member 19 is provided obliquely from the starting vertical wall 18 as reinforcement of the fixing member 6 is disclosed, when the backing force is very large, a plurality of pieces from the rear of the starting vertical wall 18 to the fixing member 6 are provided. It is also possible to use a method of extending and supporting the pressing member.
[0018]
Next, a method for preventing the backing of the propulsion pipe using this apparatus will be described. When the propulsion work for one propulsion pipe 1 is completed, the rear end surface of the propulsion pipe 1 is supported while the main push jack 10 is stretched, and the tension jack 7 provided on the support member 2 is stretched. The support material 2 is pulled inward. By tightening the support member 2, the presser fitting 3 is brought into close contact with the outer periphery of the propulsion tube 1 to hold and fix the propulsion tube 1. Then, the main pushing jack 10 is reduced to secure a space between the rear end of the propulsion pipe 1 and the head of the main pushing jack 10. The next propulsion pipe 1 is suspended and installed in the space.
When the installation of the propulsion pipe 1 is completed, the rear end of the next propulsion pipe 1 is pressurized by the main push jack 10 and the rear end face of the previous propulsion pipe 1 is brought into contact with the front end face of the next propulsion pipe 1 for propulsion. When the connection of the pipe 1 is completed, the tension jack 7 of the support member 2 is reduced to loosen the support member 2 and the propulsion pipe 1 is opened. Then, the next propulsion embedding of the propulsion pipe 1 is resumed.
[0019]
FIG. 3 is a longitudinal sectional view for explaining the propulsion pipe for preventing backing according to the present invention. A ring-shaped recess 13 is provided in front of a steel collar 12 fixed to the outer peripheral surface of the rear end of the reinforced concrete propulsion pipe 1. The concave portion 13 is configured such that a ring-shaped concave cylindrical body 14 is fixed by welding or the like so as to be inscribed in the steel collar 12, and a front cylindrical body having the same diameter as the steel collar 12 is formed on the front surface of the concave cylindrical body 14. 15 is covered and fixed by welding or the like. The width of the ring-shaped recess 13 is such that the presser fitting 3 provided on the support member 2 is fitted.
[0020]
In the present embodiment, the reinforced concrete-made propulsion pipe 1 has been disclosed. However, the present invention is not limited to the reinforced concrete pipe, and may be employed for a propulsion pipe such as a synthetic steel pipe or a steel pipe.
[0021]
FIG. 4 is a longitudinal sectional view for explaining the concave portion in detail. A steel collar 12 fixed to the outer peripheral surface of the rear end of the concrete propulsion pipe 1 protrudes rearward by a certain length so that the front end portion of the next propulsion pipe 1 can be fitted. A ring-shaped concave cylindrical body 14 is welded to the front steel collar 12 portion fixed to the concrete portion of the propulsion pipe 1 so as to be inscribed in the steel collar 12. The outer periphery of the front end of the recessed cylindrical body 14 is covered with a front cylindrical body 15 having the same diameter as the steel collar 12 and welded to form a concave portion 13 between the steel collar 12 and the front cylindrical body 15. . In the recess 13, the pressing metal 3 of the support material 2 is fitted. On the inner peripheral surface of the concave cylindrical body 14, there are provided a ring-shaped anchor bar 17 for fixing the concave cylindrical body 14 to the concrete and a ring-shaped embedded waterproofing material 16 for retaining the waterproofing.
[0022]
In the present embodiment, the formation of the recess 13 has been described by combining a ring-shaped cylinder, but it is also possible to integrate the steel collar 12 and process it with a single steel material.
[0023]
【The invention's effect】
As described above, with the backing prevention device of the present invention, the propellant tube can be held and fixed or released simply by tensioning or loosening the tendon at the top of the pair of support members, as in the prior art. The complicated work of installing and removing multiple anchor bolts has been eliminated, and it is now possible to perform very efficient and anti-backing work. In addition, when a relatively large backing force is applied, it is possible to obtain the backing prevention force by the friction force and the shearing force of the recess provided in the propulsion tube by using the backing prevention propelling tube in combination. , Excellent safety prevention for backing.
[0024]
[Brief description of the drawings]
FIG. 1 is a front view for explaining a backing preventing apparatus of the present invention.
FIG. 2 is a plan view for explaining a backing preventing apparatus of the present invention.
FIG. 3 is a longitudinal sectional view illustrating a propelling pipe for preventing backing according to the present invention.
FIG. 4 is a longitudinal sectional view for explaining a recess in detail.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Support material 3 Holding metal 4 Tension material 5 Fixing tool 6 Fixation material 7 Tension jack 8 Rail material 9 Starting pit wall 10 Main pushing jack 11 Supporting wall 12 Steel collar 13 Recess 14 Recess cylinder 15 Front cylinder 16 Water-stopping material 17 for embedding 17 Anchor bar 18 Starting shaft 19 Reinforcing material

Claims (2)

When propulsion pipes are connected during propulsion construction, the apparatus prevents the backing of the propulsion pipe row from being pushed back into the start shaft by water pressure or earth pressure acting on the tip excavator faceplate,
A pair of support materials installed so as to face both side surfaces of the propulsion pipe in front of the start shaft,
Equipped on the inside of the pair of support members, and a holding fitting that is curved along the outer periphery of the propulsion pipe,
A tension material for fastening the pair of support materials at a plurality of locations;
An anti-backing device comprising: a fixing member that fixes the pair of supporting members so as not to move backward in the propulsion direction. A propulsion pipe that prevents backing using the backing prevention device according to claim 1,
A propulsion pipe for backing prevention, characterized in that a concave portion is provided in a ring shape so that the pressing metal fitting of the support material can fall in front of a steel collar behind the propulsion pipe.

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