JPS5912319Y2 - Combined cutting edge device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for an economical, safe, and reliable excavation method, which is carried out by attaching a special cutting edge to the tip of a precast cylindrical body that is advanced underground.

The conventional method of advancing a cylinder with a cutting edge attached to its tip is (1) by using a powerful propulsion jack equipment to advance the cylinder as a reaction force receiver, or (2) by using the above-mentioned undivided cutting edge. This method is used to connect the cutting edge to the succeeding cylinder and digging simultaneously with the integrated cutting edge and the cylinder.

Since both of the above methods use an indivisible cutting edge, the extremely strong resistance to cutting through the cutting edge is eliminated, and in order to make the cutting edge dig, a considerable number of jacking equipment with great capacity are installed. Not only is the cost extremely high, but the work is also fraught with danger as all powerful jacking equipment is operated at the same time.
Furthermore, the digging resistance exerted on the cutting edge changes locally, and this change often causes the cutting edge to dig in a biased direction, and once deviation occurs, it is extremely difficult to correct the direction.

In addition, the Metselue method, which is a conventional method for propulsion through the split cutting edge, is not a method of advancing a pre-cat cylinder as in the present invention, but is a method of manufacturing a cylinder using cast-in-place concrete, so it is difficult to advance the split cutting edge. The reaction force is applied to formwork and shoring, but the support of this temporary equipment is not reliable in its ability to support the reaction force, and there is a risk that the shoring will often break and cause an accident. Not only that, but the work efficiency is poor because concrete is cast on site.

In addition, in another example of a conventional split cutting edge, a fully split cutting edge is used in which the entire circumference of the cutting edge can be divided and slid, and a movable support frame is provided on the inner periphery of this split cutting edge. A complete cylindrical body is separately arranged at the rear, and after advancing all the divided cutting edges one by one using the complete cylindrical body as a reaction force using the complete cylindrical body and a propulsion jack interposed between the two, the movable support The frame is also moved forward using a propulsion jack, and then the rear complete cylinder is advanced using a conventional construction method, but according to this method, the three parts of the fully divided cutting edge, the movable support frame, and the complete cylinder are moved forward. The blades are separated and move forward separately, so there is a lack of rigidity in the fully divided cutting edge, the directionality is large, and the movable support frame is not integrally connected to the complete cylinder, so it has the disadvantage of lacking rigidity. In the composite cutting edge device of the present invention, only the upper and side parts of the cutting edge are configured as a split cutting edge, and the lower bottom of the cutting edge or the lower bottom and the lower side of the cutting edge are of an integral structure, and the precast tube at the rear It is constructed as a cylindrical fixed blade mouth that is rigidly connected to the body, and the lower part of the support frame provided on the inner periphery of the blade mouth is rigidly connected to the cylindrical fixed blade mouth, and the upper part is also connected to the cylindrical body by a connecting member. Since it is solidified at the front part, the rigidity and strength of the cutting edge and support frame are high, and the cutting edge has excellent directionality and stability.

In addition, as a type of split cutting edge in the United States, the lower part of the entire circumference of the cutting edge is an integrated cutting edge, and the entire upper circumference is made up of finely divided cutting edges, and each tunneling machine advances separately. However, this is not related to the rear structure that is poured or shaped at the rear of the tunnel excavation machine, but only relates to the structure within the tunnel excavation machine itself, and is not related to the structure that is installed forward as in the present application. The front part of the cylindrical body and part of the bottom plate or side plate of the cylindrical body are combined with the cylindrical body to form a fixed cylindrical body that is integrated with the cylindrical body, greatly increasing the stability and rigidity of the cylindrical body. The structural purpose and effect are completely different from those in which the precast cylindrical body is advanced into the ground and installed by dividing the upper and side parts of the cutting edge to reduce the digging resistance of the cutting edge. It is.

As mentioned above, conventional construction methods had many serious drawbacks.

The device of the present invention divides the cutting edge into parts to divide the advancing resistance of the cutting edge, and causes the precast cylinder to receive the divided cutting edge propulsion reaction force, thereby ensuring and facilitating the advancement of the cutting edge. In addition to eliminating the above-mentioned drawbacks, the lower part of the cutting edge is fixed to the front part of the precast cylinder, and the cutting edge is fixed to the cylinder, increasing the directionality and rigidity of the cutting edge, making the cylinder safe, easy, and reliable. This provides an economical digging device.

Hereinafter, one embodiment of the composite cutting edge device of the present invention will be explained based on the drawings.

In Figures 1 to 3, one part or all of the upper side of both sides of the upper side of the cutting edge attached to the front part of the precast cylinder 1 to be advanced into the ground (if the main body is in the upper L part) is shown in the advancing direction. The rear part of the divided blade part 2 is slidably covered with the front outer surface of the cylinder 1, and the remaining part of the blade part other than the divided blade part 2 is divided into a plurality of pieces to form a divided blade part 2. The rear part of the part is fixedly connected to the front part of the cylinder body 1 to form a cylinder body fixed blade opening 3, and each divided blade opening 2
A forward jack 4 for advancing the blade is attached to the front part of the cylinder 1 for each divided blade opening 2, and a pushing force receiving member is used to transmit the pushing force when the advancing jack 4 is activated to the divided blade opening 2. 5 are each fixed to the inner surface of the divided cutting edge 2, and a support frame 6 for supporting the cutting edge is provided along the inner surface of the cutting edge, and the lower end of this support frame 6 is fixed to the bottom of the cylindrical fixed cutting edge 3. In addition, it is a composite cutting edge device in which the upper part of the support frame 6 and the front part of the cylindrical body 1 are fixedly connected by a connecting member 7.

In the above embodiment, the forward jack 4 is provided for each divided blade opening 2, but since each divided blade opening 2 is advanced one piece at a time, the forward jack 4 is placed at the front of the cylinder 1. There is also another embodiment in which each divided cutting edge 2 is moved forward without being fixed.

If the soil type is such that the earth pressure acting on the outer surface of the divided cutting edge 2 is extremely large, the forward resistance force of the cutting edge 2 can be reduced by inserting a lubricant between the support frame 6 and the split cutting edge 2 as shown in Figure 8. can be reduced.

Next, the functions and effects of the composite cutting edge device of the present invention will be described.

As shown in FIG. 4, the advancing jack 4 is operated to advance every other piece of the divided cutting edge 2 by one stroke length.

This is a method for moving the forward divided cutting edge 2 forward in the correct direction using the adjacent split cutting edges 2 on both sides as guides.

When all the divided cutting edges 2 have been advanced by one process length in this manner, the cylinder body 1 is advanced by one process length using a conventional method.

In this way, the cylinder 1 and the cutting edges 2 and 3 have moved forward by one stroke length.

As described above, the combined cutting edge device of the present invention has a split cutting edge in both the upper part and the side or a part above the cutting edge, and also has an integral blade in the bottom plate or the lower side. It has a structure as a mouth, and this integrated cutting mouth is fixed to the front part of the precast cylinder at the rear to form a fixed cutting mouth on the cylinder. The support frame and the front part of the cylinder are connected by a connecting member, and the lower part of the support frame is fixed to the cylinder blade opening. The synergistic effect of these is the reduction of cutting resistance by division and separation of the cutting edge digging resistance, the addition of rigidity to the cutting edge by the fixed cutting edge of the cylinder, and the rigidity and safety of the fixed cutting edge of the cylinder and the support frame that is directly or indirectly fixed to the cylinder. Along with this, it has many effects and advantages such as good directionality of the divided cutting edge, increased rigidity, directionality, and stability of the entire cutting edge, as well as good economic efficiency and safety.

[Brief Description of the Drawings] Figures 1 to 3 are views of one embodiment of the composite cutting edge device of the present invention, where Figure 1 is a longitudinal sectional view and Figure 2 is an arrow taken along the line A-A in Figure 1. A front view, FIG. 3 is a cross-sectional view taken along the line B--B, and FIG. 4 is a vertical cross-sectional view showing the divided blade opening in an advanced state. 1... Precast cylinder, 2... Divided cutting edge, 3... Fixed cutting edge of cylinder, 4... Forward jack, 5...・・Pushing force receiving material, 6・・・・・・
Support frame, 7...Connecting member, 8...Sliding material.

Claims (1)

[Scope of utility model registration request] A part or all of the upper part of both sides including the upper side of the cutting edge attached to the front part of the precast cylinder to be advanced into the ground is divided into compound arc pieces in the forward direction to form a divided cutting edge, and the rear part of the remaining part is This part is connected to the front part of the cylinder, and this part becomes a fixed blade opening, and a forward jack for advancing the divided blade opening is attached to the front part of the cylinder, and the pushing force when the forward jack is activated is applied to the divided blade opening. A pushing force receiving material for transmitting the force is attached to each divided blade mouth, and a support frame is provided along the inner surface of the blade mouth, and this support frame and the front part of the cylinder are connected by a connecting member, and the lower part of the support frame is connected to the cylinder. A composite blade device configured to be fixed to a fixed body blade.