JPH10168873A - Core material inserting device and core material insert method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable insertion easily and with high accuracy in the case of constructing a continuous ground improver and inserting a core material in the improver before the improver is consolidated. SOLUTION: A fluting device 1 comprising a cutter post 2 and an endless chain 3 stretched on the outer periphery thereof is used, and an entraining member 9 which can be locked in a core material 8 or a locking member projected on the core material 8 in the cross direction of the cutter post 2 is removably installed on the endless chain 3. By descending of the entraining member 9 caused by circulation of the endless chain 3, the core material 8 is forcedly inserted along the cutter post 2 into the ground improver 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for inserting a core material into a method for constructing a continuous ground improvement body using a trench-type ground improvement machine and inserting a core material into the improvement body before consolidating the improvement body. And a method for inserting a core material using the same.

[0002]

2. Description of the Related Art A core material such as an H-shaped steel, a steel sheet pile, a steel pipe sheet pile or the like is inserted into a ground improvement body or a soil cement pile retaining wall constructed as a foundation of a structure or a retaining wall. In this case, insertion is generally performed by vibrating the core material while holding the upper portion of the core material with a vibrohammer and lowering the core material by its own weight.

According to this method, if the core material itself has a certain degree of rigidity, it can be inserted without any problem. However, the rigidity of the core material decreases as the material length increases, and the core material is easily deformed. , Makes insertion difficult.

[0004] In particular, in the case of constructing a ground improvement body by the deep mixing method, the insertion work is more difficult because the ground improvement body immediately after construction has a high viscosity and a large insertion resistance.

[0005] Even if it is possible to insert the core material to a predetermined depth, the insertion accuracy is reduced as long as the core material is supported at only one point at the upper portion, and therefore, it is easy to deviate from the target position.

When the ground improvement body is constructed in a state of being inclined with respect to the vertical, the core material also needs to be inserted with an inclination. However, in the method of supporting the core material at one point, the insertion accuracy is reduced. It is impossible to secure the core material and the core material itself does not descend or hardly descends due to the viscous resistance of the improved body. Therefore, it is practically impossible to insert the core material.

On the other hand, in the case of a soil cement retaining wall, it is possible to increase the water content of the soil cement and liquefy the soil cement itself to insert the core material by its own weight in a state where its fluidity is enhanced. In addition, the use range is limited because the uniaxial strength of the retaining wall after consolidation is reduced due to an increase in moisture.

The present invention proposes an apparatus and a method capable of easily and highly accurately inserting a core material into a ground improvement body in view of the above background.

[0009]

SUMMARY OF THE INVENTION In the present invention, a digging device for constructing a continuous ground improvement body is utilized, and a core material is forcibly inserted into the improvement body by circulation of an endless chain, so that the improvement can be easily and easily performed. Performs insertion work with high precision.

The digging apparatus comprises an endless chain having a cutter post and an agitating claw projecting therefrom, which is stretched around the outer periphery of the cutter post, and which is used for inserting a core material. Is composed of a digging device and an entraining member which is detachably mounted on the endless chain.

The entraining member projects and is inserted on one side in the direction of travel of the cutter post so that it can be locked downward by a core member or a locking member projecting from the core member in the width direction of the cutter post. In the device, the endless chain circulates in the direction in which the entraining member descends, so that the core material descends along the cutter post as the entraining member descends.

By forcibly lowering the core material by the entraining member mounted on the endless chain, the influence of the resistance from the improved body is eliminated or reduced, so that it is not necessary to apply vibration to the core material. , And can be easily inserted. As a result, in addition to a long steel sheet pile, which becomes difficult to insert as a core material due to resistance from the improved body, it is possible to reliably insert a reinforcing steel or PC steel material having no bending rigidity to the target depth.

Further, since the core material is guided and inserted into the entraining member descending along the cutter post, the position of the lower end of the core material is regulated in the width direction and the advancing direction of the cutter post by the entraining member and the cutter post. Therefore, in addition to the case where the core material is inserted vertically and the case where the core material is inserted at an angle, a certain insertion accuracy is ensured. If the upper part is held when the core material is inserted, a certain position is maintained over the entire length. It becomes possible to insert in.

In particular, the driving member can be locked to the core member in the width direction of the cutter post, so that the core member can be locked in the width direction of the cutter post at the locking position with the driving member. Since the movement can be restricted, the insertion accuracy is improved.

[0015] Further, since the entraining member can be locked upward to the core member or the locking member as described in claim 3, the core member can be pulled up by the entraining member, so that the insertion position is shifted. Correction can be made when a gap occurs during insertion or during insertion.

In this case, the entraining member is formed so as to be able to come out forward in the traveling direction of the cutter post so that the entraining member can be detached from the core member or the locking member by advancing the cutter post.

According to a fourth aspect of the present invention, when the entraining member according to the third aspect can be locked to the core member or the locking member also in the forward direction of the cutter post in the advancing direction of the cutter post, the entraining member when the core material is inserted The core material is prevented from slipping out of the core.

According to a fifth aspect of the present invention, the core member is inserted into the endless chain by locking the entraining member downward with the core member or the engaging member supported on the ground. Is performed by circulating in a direction in which the core material descends, and the core material is lowered along the cutter post.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is to continuously move a cutting post 2 and a trench apparatus 1 comprising an endless chain 3 provided with a cutting agitating claw 4 so as to remove the cut soil and the solidified material. After constructing the ground improvement body 7 by stirring and mixing, FIG.
As shown in FIG. 5, the core material 8 is inserted into the ground improvement body 7 before the ground improvement body 7 is consolidated.

In the digging apparatus 1, the cutter post 2 is moved along the frame 6 by the hydraulic cylinder mounted on the base machine 5 in the horizontal direction by using the base machine 5 as a reaction force. While cutting the ground in a groove shape, the ground is improved by mixing the solidified material discharged from the cutter post 2 or supplied from the ground with the cutting soil, thereby constructing a ground improvement body 7 continuous in a wall shape. I do.

In the case of a slurry, the solidified material is discharged from near the lower end of the cutter post 2 or injected from near the ground. In the case of powder or pellets, a predetermined amount is sprayed on the ground in advance, or is injected or sprayed from the side near the ground where the endless chain 3 penetrates into the ground.

The core material insertion device is removably mounted on the digging groove device 1 and its endless chain 3 and projects on one side in the direction of travel of the cutter post 2 on a plane. Locking member protruding in the width direction of 2.
It is composed of an entraining member 9 which can be locked to the lower part 10. FIG.
Although the entrainment member 9 is installed at one position corresponding to the lower end portion of the core member 8, the entrainment member 9 may be installed at a position corresponding to an intermediate portion in the longitudinal direction of the core member 8.

The entraining member 9 includes a fixing portion 91 fixed to the endless chain 3 and a locking portion 92 which extends from the fixing portion 91 toward the core material 8 and is locked to the core material 8 or the locking member 10.
FIG. 7 shows an example of the entraining member 9 in a case where the core member 8 is an H-section steel and a locking member 10 is protruded outside the flange thereof.
When the locking member 10 is protruded from the driving member 9, the entraining member 9
92 are arranged side by side, and the core material 8 is sandwiched from both sides in the width direction of the cutter post 2. Since the locking portion 92 of the first aspect only needs to be locked downward to the core member 8 or the locking member 10, its elevation shape is not limited.

In the example of FIG. 7, since the locking portions 92, 92 sandwich the core 8 with a certain clearance therebetween, the core 8 can be locked to the entraining member 9 in the width direction of the cutter post 2. The core member 8 can be restrained from moving beyond the clearance in the width direction of the cutter post 2.

When the core member 8 is an H-section steel, the entrainment member 9 can also be locked downward to the core member 8 by forming an opening in the web.
One or two locking portions 92 project from 91. Also in this case, the locking portion 92 is provided with the
Therefore, the core member 8 can be restricted from moving in the width direction of the cutter post 2.

The entraining member 9 is detachably fixed to the endless chain 3 by screwing a bolt 11 penetrating through the fixing portion 91 into the endless chain 3 as shown in the figure.
The endless chain 3 is sandwiched between the entrainment member 9 by a clamp, a U-bolt, or a plate connected to the endless chain 3 and the entrainment member 9 is restrained by the endless chain 3. Alternatively, it is also fixed by engaging and stopping.

FIG. 8 shows an example of the entraining member 9 when the core material 8 is a PC steel material. In this case, a fixing plate connected to the lower end of the PC steel for fixing to the ground improvement body 7 is provided with a locking member 10.
Used as Also in this case, the entraining member 9 is
2 and 92 are arranged side by side, and the core member 8 is sandwiched from both sides in the width direction of the cutter post 2, so that the core member 8 has a role of restricting the movement of the cutter post 2 in the width direction.

FIG. 9 shows an example of the entraining member 9 when the core material 8 is a steel sheet pile. In this case, a locking member is attached to the lower end of the core material 8.
10 is projected, and the entraining member 9 is provided with locking portions 92, 92.
So that they are locked on both sides in the width direction of the cutter post 2. Also in this case, the entraining member 9 has a role of restricting the movement of the core material 8.

Since the steel sheet piles are turned one by one and are inserted in the width direction of the cutter post 2 between adjacent steel sheet piles, the locking portions 92, 92 do not collide with the core material 8. ,
On the plane, the core material 8 is located on one side in the width direction with respect to a center line facing the traveling direction of the cutter post 2 so as to sandwich the core material 8. In this case, the entraining member 9 is detached from the endless chain 3 each time the insertion of one core material 8 is completed, and is fixed again by changing its direction.

FIG. 10 shows a state in which the locking member 92 of the entraining member 9 can be locked to the locking member 10 upward when the locking member 10 is protruded from the core member 8. An example is shown in which the locking member 10 is sandwiched from above and below, and the core member 8 can be pulled up by the entraining member 9. When the core member 8 is an H-section steel and an opening is formed in the web as described above, the locking portion 92 inserted into the opening can also be locked to the core member 8 upward. It is not necessary that 92 be shaped as in FIG. The entraining member 9 shown in FIG. 10 corresponds to correction when the insertion position of the core material 8 is shifted or when the insertion is shifted during insertion.

In FIG. 10, since the locking portion 92 can also be locked to the locking member 10 upward, the locking member 10 can be locked even when the entrainment member 9 is pulled up after the insertion of the core material 8 is completed. Since the locking is performed, the locking portion 92 is cut out from the core member 8 so that the entraining member 9 can come out of the locking member 10 by the advance of the cutter post 2 after the insertion.

FIG. 11 shows a case in which the notch 93 is formed in the locking portion 92 as shown in FIG. 10, and the depth of the notch 93 is increased so that the locking portion 92 becomes the core material 8 or the locking member 10. To cutter post 2
An example in which the notch 93 is formed so as to be locked forward in the traveling direction of the core member 8 to prevent the core member 8 from detaching from the entraining member 9 when the core member 8 is inserted will be described. In this case, the core material 8,
Alternatively, the locking member 10 is locked on the inner periphery of the notch 93 when the core material 8 moves in a direction away from the cutter post 2.

As shown in FIGS. 1 to 3, the upper portion of the core member 8 is supported by a wire 12 or the like, or together with the support by the wire 12 or the like as shown in FIGS. It is arranged at a predetermined position in a state guided by the like, and in that state, the lower part of the core material 8 or the locking member 10
The entraining member 9 located on the ground is locked downward.

FIGS. 1 and 2 show a case where the core material 8 is an H-shaped steel, and FIG. 1 shows a case where the heads of the core materials 8 having the same length are aligned and inserted.
FIG. 2 shows a case where core members 8 having partially different lengths are inserted with their ends aligned. FIG. 3 shows a case where the core material 8 is a reinforced cage. In this case, the hoop reinforcement of the reinforcing rod cage becomes the locking member 10,
The locking portion 92 of the entraining member 9 locks the locking member 10 downward at the outer periphery of the core member 8 or through the core member 8.

FIGS. 4 to 6 show the procedure for inserting the core member 8 at an angle. In this case, the ground improvement is performed in a state where the frame 6 of the base machine 5 is inclined, and the insertion of the core material 8 is performed as it is. FIG. 4 shows a state before the core material 8 is installed, and FIG.
2 shows a state in which the core member 8 is guided and installed by the guide member 14 installed along the inclined surface, and insertion is started. FIG. 6 shows a case where a gantry 15 having an inclined surface is installed on the ground in place of the guide member 14 of FIG.

After the entrainment member 9 is locked, the endless chain 3 is moved to the entrainment member 9 while supporting or holding the upper portion of the core 8.
The core material 8 is inserted by circulating in a direction in which the core material 8 descends.

When the entire length of the core 8 has been inserted at a predetermined position on the plane, the insertion of the core 8 is completed. If an error occurs during insertion, the core member 8 is once pulled up by the entraining member 9 shown in FIG. 10 and reinserted.

After the insertion of the core material 8 is completed, the entraining member 9 is lifted to the ground as it is, and the digging device 1 is advanced to the next core material 8 insertion position. The entraining member 9 is a core member 8 or a locking member.
When the cutter post 2 is to be locked upward, the cutter post 2 is once advanced to detach the entraining member 9 from the core member 8, and then the entraining member 9 is raised to advance the trench apparatus 1.

After the digging device 1 advances, the next core material 8 is inserted.

[0040]

According to the first to fourth aspects of the present invention, the engraving device for constructing the continuous ground improvement body is used, and the entraining member for downwardly engaging the core or the engaging member protruding from the core is used. By lowering by circulation of the endless chain, the core material is forcibly inserted into the improved body, so it is not affected by the resistance from the improved body, and it is not necessary to give vibration when inserting by its own weight, Insertion can be performed reliably and easily.

As a result, in addition to a long steel sheet pile, a steel bar having no bending rigidity or a PC steel can be used as a core material.
Including these, the core material can be reliably inserted to the target depth.

Since the core material is regulated in the width direction and the traveling direction of the cutter post by the entraining member and the cutter post, a constant insertion accuracy can be obtained not only when the core material is inserted vertically but also when the core material is inserted at an angle. Can be secured.

In the second aspect, since the entraining member is also locked to the core in the width direction of the cutter post, the movement of the core in the width direction of the cutter post can be restricted, and the insertion accuracy is improved.

In the third aspect, since the entraining member is also locked upward by the core member or the locking member, the core member can be pulled up by the entraining member, and when the insertion position shifts or during the insertion, a shift occurs. Can be corrected when it is done.

In a fourth aspect, the entrainment member of the third aspect is a core material,
Alternatively, since the locking member can be locked to the front side in the traveling direction of the cutter post, it is possible to prevent the core material from coming off from the entrainment member when the core material is inserted.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a state where a core material is inserted by a digging device and an entraining member.

FIG. 2 is an elevational view showing a state of inserting a core material when the lengths of the core materials are different.

FIG. 3 is an elevation view showing a state of insertion of a core material when the core material is a reinforced cage.

FIG. 4 is a side view showing a base machine and a digging device when inserting a core material at an angle.

FIG. 5 is a side view showing a state where a core member 8 is inserted by a guide member and a digging groove device installed in the base machine of FIG. 4;

6 is a side view showing a state in which a core 8 is inserted by a gantry and a digging groove device installed on the ground instead of the guide member of FIG.

FIG. 7 is a cross-sectional view showing an example of an entraining member when the core material is an H-section steel.

FIG. 8 is a cross-sectional view showing an example of the entraining member when the core material is a PC steel material.

FIG. 9 is a cross-sectional view showing an example of the entraining member when the core material is a steel sheet pile.

FIG. 10 is an elevational view showing an entraining member and a core material according to claim 3;

FIG. 11 is an elevational view showing an entraining member and a core member according to claim 4;

[Explanation of symbols]

1 ... Drilling groove device, 2 ... Cutter post, 3 ... Endless chain, 4 ... Cutting stirrer claw, 5 ... Base machine, 6 ...
... frame, 7 ... ground improvement body, 8 ... core material, 9 ... entrainment member, 91 ... fixed part, 92 ... locking part, 93 ... notch,
10 ... locking member, 11 ... bolt, 12 ... wire, 13 ...
Leader, 14 ... Guide member, 15 ... Stand.

Claims (5)

[Claims] The cutting soil and the solidified material are agitated and mixed while continuously moving a digging device comprising an endless chain provided with a cutter agitating claw projecting from a cutter post and an outer periphery thereof. A continuous ground improvement body is an insertion device used for a method of inserting a core material into the improvement body before consolidation of the improvement body, and is detachably mounted on the trench apparatus and its endless chain. A driving member which projects on one side in the traveling direction of the cutter post on the plane and can be locked downward by a core member or a locking member projecting from the core material in the width direction of the cutter post, and An endless chain insertion device in which an endless chain circulates in the descending direction, and the entraining member descends along the cutter post as the entraining member descends. 2. The core material insertion device according to claim 1, wherein the entraining member can be locked to the core material in a width direction of the cutter post. 3. The core material insertion device according to claim 1, wherein the entraining member is lockable upward with the core material or the locking member, and is capable of being pulled out forward in the traveling direction of the cutter post. 4. The core material insertion device according to claim 3, wherein the entraining member can be locked to the core material or the locking member in a forward direction of the cutter post in the traveling direction. 5. The cutting soil and the solidified material are agitated and mixed while continuously moving a cutter post and an excavation device comprising an endless chain provided with a cutting stirrer protruding from the periphery of the cutter post. A method of constructing a continuous ground improvement body and inserting a core material into the improvement body using the core material insertion device according to any one of claims 1 to 4 before consolidation of the improvement body,
After the entraining member of the core material insertion device is locked downward by the core material supported on the ground or by a locking member projecting in the width direction of the cutter post from the core material, the endless chain is entrained by the entraining member. A core material is circulated in the direction in which the core material descends, and the core material is lowered along the cutter post.