JP3741807B2 - Core material insertion device and core material insertion method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a core material insertion device used for a method of constructing a continuous ground improvement body by a digging groove type ground improvement machine and inserting a core material into the improvement body before consolidation of the improvement body, and a core material using the same It relates to the insertion method.
[0002]
[Prior art and problems to be solved by the invention]
When inserting core materials such as H-shaped steel, steel sheet piles, and steel pipe sheet piles into ground improvement bodies and soil cement pile retaining walls constructed as foundations and retaining walls for structures, the upper part of the core material is generally vibro hammered. Insertion is performed by applying vibration to the core material while being held in place and lowering the core material by its own weight.
[0003]
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 easily deforms. It becomes difficult.
[0004]
In particular, when the ground improvement body is constructed by the deep mixing method, the ground improvement body immediately after the construction is high in viscosity and the insertion resistance is large, so that the insertion work is more difficult.
[0005]
Even if it is possible to insert up to a predetermined depth, since the insertion accuracy is lowered as long as the core material is supported by only one upper point, it is likely to be out of the target position.
[0006]
In addition, when the ground improvement body is constructed in a state inclined with respect to the vertical, the core material also needs to be inserted with an inclination, but the method of supporting the core material at one point should ensure the insertion accuracy. However, the core material itself does not descend or is difficult to descend due to the viscous resistance of the improved body, so that it is substantially impossible to insert the core material.
[0007]
On the other hand, with the soil cement retaining wall, it is possible to insert the core material with its own weight while increasing its fluidity by increasing the moisture in the soil cement and liquefying the soil cement itself. The range of use is limited in order to sacrifice the uniaxial strength of the retaining wall after consolidation due to the increase.
[0008]
The present invention proposes an apparatus and method that can insert a core material into a ground improvement body easily and with high accuracy from the above background.
[0009]
[Means for Solving the Problems]
In the present invention, the digging apparatus for constructing the continuous ground improvement body is used, and the core material is forcibly inserted into the improvement body by the circulation of the endless chain, so that the insertion operation can be performed easily and with high accuracy.
That is, according to the present invention, as described in claim 1, cutting is performed while continuously moving a digging apparatus comprising an endless chain projecting from a cutter post and a cutting stirring claw, which is stretched around the cutter post. This is an insertion device used for a method of constructing a continuous ground improvement body by stirring and mixing soil and solidification material, and inserting a core material into the improvement body before consolidation of the improvement body, The endless chain is detachably mounted, and is composed of a locking member that protrudes on the core material on a flat surface, or a locking member that can lock the core material downward. The endless chain circulates in the direction of the core member, and the core member is inserted along the cutter post as the entraining member descends.
[0010]
As described above, the grooving device is composed of a cutter post and an endless chain that is stretched around the outer periphery of the cutter post and is provided with a cutting stirring claw. The entraining member is detachably attached to the endless chain.
[0011]
The entrainment member is a locking member (especially a locking member protruding in the width direction of the cutter post on the core material) or one side of the cutter post in the traveling direction on the plane so that the core material can be locked downward. As the endless chain circulates in the direction in which the entraining member descends, the insertion device lowers the core material along the cutter post as the entraining member descends.
In addition, the width direction of a cutter post is the width direction of the cutter post in FIG. 7, FIG. 8, and FIG.
[0012]
Since the core material is forcibly lowered by the entrainment member attached to the endless chain, the influence of the resistance from the improved body is eliminated or reduced, so there is no need to give vibration to the core material, and it is reliable and easy. Can be inserted. As a result, in addition to the long steel sheet pile that is difficult to insert as a core material due to the resistance from the improved body, it is possible to reliably insert a reinforcing bar without bending rigidity and a PC steel material to the target depth.
[0013]
In addition, the core material is guided and inserted into the entraining member that descends along the cutter post, so that the position of the lower end of the core material is regulated by the entraining member and the cutter post in the width direction of the cutter post and the direction in which the endless chain descends. Therefore, in addition to the case where the core material is inserted vertically, the insertion accuracy is ensured even when the core material is inclined, and if the upper portion is held when the core material is inserted, the entire length is constant. It becomes possible to insert in the position.
[0014]
In particular, by enabling the entrainment member to be locked to the core material in the width direction of the cutter post as described in claim 2, the core material is moved against the movement of the cutter post in the width direction at the locking position with the entrainment member. Since it can restrain, insertion accuracy improves.
[0015]
In addition, since the entrainment 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 entrainment member. It is possible to correct when a deviation occurs during insertion.
[0016]
In this case, the entraining member is formed so that the locking member or the core material can be pulled out to the opposite side of the cutter post in the moving direction so that the entraining member can be detached from the locking member or the core material by the advancement of the cutter post.
The moving direction of the cutter post is the right side direction in FIGS. 1, 2, and 3, and the opposite direction side is FIGS. 1, 2, 3, 7, 8, 9, and 9. 1 0, the direction of left side in FIG. 11.
[0017]
Further, as described in claim 4, the entrainment member according to claim 3 can be used when the core member is inserted if the locking member protruding from the core material or the core material can be locked in the direction away from the cutter post. The core material is prevented from coming off from the entraining member.
[0018]
As described in claim 5, the core member is inserted into the endless chain after the entraining member is locked downward by the core member or the locking member supported on the ground. is circulated in the direction is carried out by lowering the core material along the cutter post.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The invention of claim 1 improves the ground by stirring and mixing the cutting soil and the solidified material while continuously moving the digging apparatus 1 comprising the cutter post 2 and the endless chain 3 on which the cutting stirring claw 4 protrudes. After the body 7 is constructed, the core material 8 is inserted into the ground improvement body 7 before the ground improvement body 7 is consolidated as shown in FIG.
[0020]
In the grooving device 1, a cutter post 2 is moved along a frame 6 by a hydraulic cylinder mounted on a base machine 5 and moved in a horizontal direction using the base machine 5 as a reaction force, and the cutting stirring claw 4 of the circulating endless chain 3 is grounded. The ground is improved by mixing the solidified material discharged from the cutter post 2 or supplied from the ground with the cutting soil while cutting into a groove shape, and a ground improvement body 7 that is continuous in a wall shape is constructed.
[0021]
In the case of a slurry, the solidified material is discharged from the vicinity of the lower end portion of the cutter post 2 or injected from the vicinity of the ground portion. In the case of powder or pellet form, a predetermined amount is sprayed on the ground in advance, or the endless chain 3 in the vicinity of the ground is thrown in or sprayed from the side penetrating into the ground.
[0022]
The core material insertion device is detachably attached to the digging groove device 1 and its endless chain 3, and projects to the core material side on the plane, on the plane, in the core material 8 or the core material 8 in the width direction of the cutter post 2. consists lockable entraining member 9 the locking member 10 is projected downward. In FIG. 1, the entraining member 9 is installed at one position corresponding to the lower end portion of the core material 8, but the entraining member 9 may also be installed at a position corresponding to the middle portion in the length direction of the core material 8. is there.
[0023]
The entraining member 9 includes a fixing portion 91 fixed to the endless chain 3, and a locking portion 92 that projects 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 entrainment member 9 in the case where the core member 8 is an H-shaped steel and the locking member 10 protrudes from the outside of the flange. When the locking member 10 protrudes from the core member 8, The entraining member 9 has the engaging portions 92 and 92 arranged in parallel, and the core material 8 is sandwiched from both sides of the cutter post 2 in the width direction. Since the locking part 92 of claim 1 only has to be locked downward to the core member 8 or the locking member 10, the elevational shape thereof is not limited.
[0024]
In the example of FIG. 7, the core member 8 can be locked to the entraining member 9 in the width direction of the cutter post 2 by sandwiching the core member 8 with a certain clearance between the locking portions 92, 92. 8 can be restrained against movement in the width direction of the cutter post 2 exceeding the clearance.
[0025]
When the core material 8 is an H-shaped steel, the entraining member 9 can be locked downward to the core material 8 by forming an opening in the web. In this case, the entraining member 9 is one piece from the fixing portion 91. Or two locking portions 92 are overhanging. Also in this case, since the locking portion 92 can be locked to the core material 8 in the width direction of the cutter post 2, the movement of the core material 8 in the width direction of the cutter post 2 can be restricted.
[0026]
The entraining member 9 is detachably fixed to the endless chain 3 by screwing a bolt 11 penetrating the fixing portion 91 into the endless chain 3 as shown in the figure, as well as a clamp or U bolt connected to the fixing portion 91, Alternatively, the endless chain 3 is sandwiched between the entraining member 9 by a plate and the entraining member 9 is constrained to the endless chain 3, or is fitted to or engaged with the endless chain 3 at the fixing portion 91 to prevent it from coming off. Also fixed by.
[0027]
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 material for fixing to the ground improvement body 7 is used as the locking member 10. Also in this case, since the engaging member 9 has the engaging portions 92 and 92 arranged in parallel and sandwiches the core material 8 from both sides of the cutter post 2 in the width direction, the core material 8 is moved in the width direction of the cutter post 2. Have the role to restrain.
[0028]
FIG. 9 shows an example of the entrainment member 9 when the core material 8 is a steel sheet pile. In this case, a locking member 10 projects from the lower end portion of the core member 8, and the entraining member 9 is arranged in parallel so that the locking portions 92, 92 are locked to the locking member 10 on both sides in the width direction of the cutter post 2. Become a shape. Also in this case, the entraining member 9 has a role of restricting the movement of the core member 8.
[0029]
Since the steel sheet piles are turned one by one and inserted between the adjacent steel sheet piles in the width direction of the cutter post 2, the locking portions 92, 92 do not collide with the core material 8, and the core material. 8 is positioned on one side of the plane in the width direction from the center line facing the traveling direction of the cutter post 2 so as to sandwich 8. In this case, the entraining member 9 is removed from the endless chain 3 every time the insertion of one core member 8 is completed, and is fixed again by changing the direction.
[0030]
FIG. 10 shows that when the locking member 10 protrudes from the core member 8, the locking portion 92 is locked so that the locking portion 92 of the entraining member 9 can be locked to the locking member 10 upward. An example is shown in which the member 10 is sandwiched from the bottom and the core member 8 can be pulled up by the entraining member 9. When the core material 8 is H-shaped steel and an opening is formed in the web as described above, the locking portion 92 inserted through the opening can lock the core material 8 upward. 92 need not be shaped as shown in FIG. The entraining member 9 shown in FIG. 10 corresponds to correction when the insertion position of the core member 8 is shifted or when a shift occurs during the insertion.
[0031]
In FIG. 10, the locking portion 92 can also be locked above the locking member 10 , so that it can be locked to the locking member 10 even when the entraining member 9 is pulled up after the insertion of the core material 8 is completed. Thus, the locking portion 92 is cut out from the core material 8 side so that the entraining member 9 can come out of the locking member 10 by the advancement of the cutter post 2 after the insertion is completed.
[0032]
In FIG. 11, when the notch 93 is formed in the locking part 92 as shown in FIG. 10, the distance behind the notch 93 is increased, and the locking part 92 attaches the locking member 10 or the core material 8 to the cutter post 2. An example in which the core member 8 is prevented from detaching from the entrainment member 9 when the core member 8 is inserted by forming the notch 93 in a shape that can be locked in the direction opposite to the traveling direction of is shown. In this case, the core member 8 or the locking member 10 is locked to the inner periphery of the notch 93 when the core member 8 is about to move away from the cutter post 2.
[0033]
The core material 8 is supported by the wire 12 or the like at the top as shown in FIGS. 1 to 3, or guided by the reader 13 or the frame 6 of the base machine 5 together with the support of the wire 12 or the like as shown in FIGS. In this state, it is arranged at a predetermined position, and in this state, the lower part of the core member 8 or the locking member 10 is locked downward by the entraining member 9 located on the ground .
[0034]
1 and 2 show a case where the core 8 is an H-shaped steel, and FIG. 1 shows a case where the heads of the core 8 having the same length are inserted in alignment. FIG. 2 shows a core having a partially different length. 8 is a case where the tips are inserted with their ends aligned. FIG. 3 shows a case where the core material 8 is a reinforcing bar rod. In this case, the hoop bar of the reinforcing bar becomes the locking member 10, and the locking portion 92 of the entraining member 9 is engaged with the locking member 10 on the outer periphery of the core material 8 or through the core material 8 downward. Stop.
[0035]
FIGS. 4-6 shows the point in the case of inserting the core material 8 inclining. In this case, the ground improvement is performed in a state where the frame 6 of the base machine 5 is inclined, and the core material 8 is also inserted as it is. FIG. 4 shows the state before the core material 8 is installed, and FIG. 5 shows that the core material 8 is guided by the guide member 14 installed along the inclined surface of the leader 13 or the frame 6 and the insertion is started. Show the state. FIG. 6 shows a case where a stand 15 having an inclined surface is installed on the ground instead of the guide member 14 of FIG.
[0036]
After the entrainment member 9 is locked, the core material 8 is inserted by circulating the endless chain 3 in the direction in which the entrainment member 9 descends while supporting or holding the upper portion of the core material 8.
[0037]
When the entire length of the core material 8 is inserted at a predetermined position on the plane, the insertion of the core material 8 is completed. When an error occurs during the insertion, the core member 8 is once pulled up by the entraining member 9 shown in FIG.
[0038]
After the insertion of the core material 8 is completed, the entraining member 9 is raised as it is to the ground, and the digging apparatus 1 is advanced to the next core material 8 insertion position. When the entraining member 9 is locked upward to the core member 8 or the locking member 10, the cutter post 2 is once moved forward to disengage the entraining member 9 from the core member 8, and then the entraining member 9 is raised and excavated. The groove device 1 is advanced.
[0039]
After the digging apparatus 1 is advanced, the next core material 8 is inserted.
[0040]
【The invention's effect】
In the first to fourth aspects, the digging apparatus for constructing the continuous ground improvement body is utilized, and the entraining member that locks downward to the locking member protruding from the core material or the core material is circulated by endless chain circulation. By lowering, the core material is forcibly inserted into the improved body, so there is no need to be affected by the resistance from the improved body, and there is no need to give vibration when inserting with its own weight. Insertion is possible.
[0041]
As a result, in addition to the long steel sheet piles, reinforcing bars and PC steel materials having no bending rigidity can be used as the core material, and the core material including these can be reliably inserted to the target depth.
[0042]
In addition, since the core material is regulated by the entraining member and the cutter post in the width direction of the cutter post and the direction in which the endless chain descends , the core material is inserted not only vertically but also when it is inserted at an angle. Accuracy can be secured.
[0043]
According to the second aspect, since the entraining member is also locked to the core member in the width direction of the cutter post, the movement of the core member in the width direction of the cutter post can be restricted, and the insertion accuracy is improved.
[0044]
In claim 3, since the entraining member is also locked upward to the core member or the locking member, the core member can be pulled up by the entraining member, and when the insertion position is deviated or during the insertion, Corrections are possible.
[0045]
In claim 4, the entraining member of claim 3 is configured so that the locking member protruding from the core material or the core material can be locked in the direction away from the cutter post . The core material is prevented from coming out.
[Brief description of the drawings]
FIG. 1 is an elevational view showing a state in which a core material is inserted by a digging apparatus and an entraining member.
FIG. 2 is an elevational view showing how a core material is inserted when the lengths of the core materials are different.
FIG. 3 is an elevational view showing a state of core material insertion when the core material is a reinforcing bar.
FIG. 4 is a side view showing a base machine and a grooving device when a core material is inserted at an angle.
5 is a side view showing a state in which a core member 8 is inserted by a guide member and a grooving device installed in the base machine of FIG. 4. FIG.
6 is a side view showing a state where the core member 8 is inserted by a gantry and a digging groove device installed on the ground instead of the guide member of FIG. 5; FIG.
FIG. 7 is a cross-sectional view showing an example of an entraining member when the core material is H-shaped steel.
FIG. 8 is a cross-sectional view showing an example of an entrainment member when the core material is PC steel.
FIG. 9 is a cross-sectional view showing an example of an entraining member when the core material is a steel sheet pile.
FIG. 10 is an elevational view showing the entraining member and the core member 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]
DESCRIPTION OF SYMBOLS 1 ... Groove device, 2 ... Cutter post, 3 ... Endless chain, 4 ... Cutting stirring claw, 5 ... Base machine, 6 ... Frame, 7 ... Ground improvement body, 8 ... Core material, 9 ... Entraining 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)

A continuous ground improvement body is prepared by stirring and mixing the cutting soil and solidified material while continuously moving the grooving device consisting of an endless chain with a cutting stirring claw protruding from the cutter post and its outer periphery. constructs a insertion device for use in a method of inserting a core material into an improved body before consolidation of the improvement thereof, said Homizo device detachably mounted on the endless chain, on a plane, the core It is composed of a locking member that protrudes to the material side and protrudes from the core material, or an entraining member that can lock the core material downward, and the endless chain circulates in the direction in which the entraining member descends. Core material insertion device that lowers the material along the cutter post. The core material insertion device according to claim 1 , wherein the entraining member is capable of locking the locking member of the core material or the core material in the width direction of the cutter post . Entraining member upwardly into engagement possible to the locking member or core member, the locking member or core material according to claim 1 or claim 2, wherein the traveling direction of the cutter post can be escaped to the opposite direction Core material insertion device. The core member insertion device according to claim 3 , wherein the entrainment member is capable of locking the locking member or the core material protruding from the core material in a direction away from the cutter post .   A continuous ground improvement body is prepared by stirring and mixing the cutting soil and solidified material while continuously moving the grooving device consisting of an endless chain with a cutting stirring claw protruding from the cutter post and its outer periphery. A method of constructing and inserting a core material into the improved body using the core material inserting device according to any one of claims 1 to 4 before the improved body is consolidated, After locking the entraining member of the core material insertion device downward to a certain core material or a locking member protruding in the width direction of the cutter post on the core material, the endless chain is circulated in the direction in which the entraining member descends. A core material insertion method that lowers the core material along the cutter post.

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