JP3760365B2 - Core material erection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for building a core material in concrete that has been driven into a trench when a continuous underground wall is constructed.
[0002]
[Prior art]
  FIG. 6 is a diagram illustrating a conventional technique for constructing a continuous underground wall, and a problem in the conventional technique, in which (A) is a two-sided view depicting a completed continuous underground wall; B) is a vertical cross-sectional view in a state where the construction of the core material is started, (C) is a vertical cross-sectional view in a state where the core material is being constructed, and (D) It is a vertical sectional view in a state where the core material is biased.
  As shown in the upper half of FIG. 6A, the trench 1 is formed by excavating the ground. The vertical cross section of the trench 1 is shown in FIG.6As shown in the lower half of (A).
  Concrete 2 is driven into the trench 1, and a core material (in this example, H-shaped steel) is placed therein.3The concrete 2 is hardened in a state where it is built vertically, and a continuous underground wall is formed.
  In the plan view drawn in the upper half of this FIG. 6 (A), it is drawn by cutting the length in the horizontal direction (the vertical direction in the figure. In the horizontal longitudinal direction described above, many core materials (H-shaped steel) 6, the length L of the core material 3 is shown in FIG.₀Is shorter than the actual shape, but is a long member such as 30 meters.
[0003]
In order to construct the continuous underground wall having the structure as described above, concrete 2 is placed in the trench 1 as shown in FIG. 6B, and the core 2 is hardened before the concrete 2 is hardened. Build material 3. Although it is suspended by a crane in this example, the core material 3 sinks into the concrete 2 by its own weight at the initial stage of construction as shown in FIG.
[0004]
[Problems to be solved by the invention]
As the core material 3 sinks into the concrete 2, it becomes increasingly difficult to sink. The dimension Lx shown in FIG. 6C is a depth dimension in which the core material 3 is immersed in the concrete, and gradually increases as the work progresses.
The reason why the settlement gradually becomes difficult is mainly due to the fact that the frictional resistance between the side surface of the core material 3 and the concrete 2 increases as the dimension Lx increases.
Furthermore, the concrete contained in the bottom of the trench is injected earlier than the concrete of the surface layer portion, the degree of hardening is advanced in the deeper portion than the surface layer portion, and the dimension Lx This is because the buoyancy that the core material 3 receives from the concrete 2 increases with the increase in the number of the cores 3.
[0005]
Furthermore, it cannot be overlooked that the prevention or reduction of pollution associated with the construction of the continuous underground wall indirectly promotes the difficulty in settlement of the core material 3.
In other words, the soil generated by excavating the trench is sieved to collect aggregate, mixed with cement milk, and put into the trench. In this case, the mixing ratio of earth and sand as cement waste and cement milk is one of important matters that must be considered based on various working conditions, and is deeply related to material cost and concrete strength. This cement milk mixing ratio also affects the environmental maintenance around the continuous underground wall construction site.
[0006]
Increasing the mixing ratio of cement milk reduces the amount of soil reuse. This means that the amount of generated soil increases.
Therefore, the traffic volume of construction vehicles carrying cement milk increases, and the traffic volume of construction vehicles for transporting residual soil also increases, which has a negative impact on the lives of neighboring residents and the activities of neighboring industries. Effect.
For this reason, it is a recent trend to reduce pollution by reducing the mixing ratio of cement milk as much as possible within the range allowed by other conditions.
However, if the mixing ratio of cement milk is small and the amount of reused soil is increased, it becomes difficult to insert the core material. The reason is as follows.
That is, the cement milk initially has fluidity and hardens gradually. Compared to this, there is very little change in fluidity with time of soil discharge, and less fluidity than cement milk. For this reason, concrete with a low cement milk mixing ratio is poor in fluidity, and it is difficult to sink the core material by its own weight even in the initial state where the cement component is not cured.
[0007]
(Refer to FIG. 6C) When the dimension Lx in which the core material 3 sinks into the concrete 2 increases, it becomes difficult to sink due to the reason described above. In addition, if the cement milk mixing ratio is reduced in order to reduce residual soil carry-out pollution, it becomes more difficult for the core material 3 to sink.
However, it is extremely undesirable to apply a pressure input as indicated by the arrow P.
The reason is that the core material 3 may be inclined as compared with the vertical posture as shown in FIG. 6D.
If the core material, which is an important strength member, is biased, the strength quality of the continuous underground wall will deteriorate. Nevertheless, it is very difficult to inspect whether the core 3 is standing straight or inclined in the concrete 2. For this reason, when the core material 3 is press-fitted as indicated by the arrow P, the quality reliability of the continuous underground wall is lowered.
[0008]
Therefore, in the present situation, when the core material 3 no longer sinks (in the present invention, when the core material does not sink (fall down), including the case where the sinking speed is remarkably reduced and almost stops visually). The operation of lifting the core material 3 slightly with a crane and dropping it is repeated. If this operation is performed violently, vibration and noise pollution are generated, so it cannot be performed very violently.
If the cement milk mixing ratio is increased so that the core material does not have to be lifted / dropped vigorously, the amount of residual soil may increase and cause pollution, and the material cost of cement will increase.
[0009]
The present invention has been made in view of the above-described circumstances, and a core material can be safely, surely, and quickly built in concrete in a vertically downward position with high accuracy, It aims at providing the construction method suitable for implementing the method which can be built at an inclination angle, and said method.
[0010]
[Means for Solving the Problems]
The basic principle of the present invention created to achieve the above object will be briefly described with reference to FIG. 1 corresponding to the embodiment as follows.
To hold the core 3 vertically and push it down into the concrete below (not shown),
The core member 3 is gripped by the chuck mechanism 6, and the chuck mechanism is pressed down by the hydraulic cylinder 8 while the chuck mechanism is guided in the vertical direction by the reader 4. The hydraulic cylinder is attached to a leader 4, and the leader is attached to “an arm 5 a that is a work front attachment for a construction vehicle such as a shovel car”, and its inclination angle can be adjusted. The reaction force of the core material press-fitting is supported by the construction vehicle via the arm 5a.
[0019]
In the present invention, a novel improvement is added to the structure of the chuck mechanism.
That is, the configuration of the invention according to claim 1 is:A chuck mechanism that supports the core material built into the concrete so that it can be gripped and released; and
  A reader for guiding the chuck mechanism to move in parallel;
  A hydraulic cylinder that reciprocates along the reader with the chuck mechanism;
  A hydraulic circuit including a hydraulic pump and control valves for supplying pressure oil to the hydraulic cylinder,
  In addition, the leader can be attached to an arm configured as an attachment for a working machine of a construction vehicle, and an earth auger or a drilling device similar to the earth auger is attached to the leader.Not
Furthermore, the chuck mechanism is
A chuck body with a U-shaped cross-section with a shape and dimensions that fits around the core;
A roller member for guiding the core material so as to be movable in the longitudinal direction;
A chuck claw that clamps the core material so that it can be gripped and released; and
And a roller member that supports the U-shaped chuck body and guides the guide body along the guide rail of the reader.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  FIG. 1 is a front view showing an embodiment of a core building device configured to carry out a core building method according to the present invention.
  A member denoted by reference numeral 4 is a leader and, as will be described in detail with reference to FIGS. 2 and 3 to be described later, an arm of a work machine (an excavator in this example) which is an earthwork attachment for a construction vehicle. The arm of the car 5) is attached to and supported by the tip of 5a.
  With this configuration, it is convenient to operate the construction vehicle to lift and transport the leader, or to lower it and set it on the ground. In addition, the inclination angle of the leader 4 (referenced to the earth) This is convenient because the angle formed with respect to the vertical line can be freely controlled.
  In a construction vehicle, a hook-shaped member that supports and drives an earthwork machine such as a bucket has various names such as an arm, a boom, a wrist, and the definition is not clear.
  In the present invention, the arm is a collective term for “a member that constitutes a working machine for a construction vehicle and is a hook-like member that is mounted on a chassis or a frame and supports an earthwork machine”.
  The reader is used in a state where it is fixedly supported in the vertical vertical direction or the diagonal vertical direction. The leader 4 is provided with a guide rail 4a, and the roller 7 isThroughThus, the chuck arm 6 c of the chuck mechanism 6 is guided in parallel with the reader 4.
As will be described in detail later with reference to FIG. 4, the core portion of the present invention is in a specific configuration of the chuck mechanism.
  The chuck mechanism 6 is reciprocated up and down by a hydraulic cylinder 8 so as to translate in the longitudinal direction of the reader 4. The chuck mechanism 6 includes a chuck claw 6a driven by a chuck cylinder 6b, and can grip the core material 3 in parallel with the reader 4 or release the grip.
[0028]
  FIG. 2 is a view for explaining the working state of the core erection device depicted in FIG. 1 described above. The core suspended by a crane is shown in the overall front view of the core erection device. The material is added. However, the core material is drawn by cutting the length direction.
  The core material 3 is suspended just above the trench 1 into which the concrete 2 has been poured, and is suspended vertically downward as indicated by arrows a and b.
  Since the core building device is mounted on the arm 5a of the shovel car 5, it can be moved freely.
  When the core material crane 9 is suspended as shown by an arrow a, a chuck mechanism (abbreviation: chuck) 6 is placed in front of the core material 3 in advance to be on standby.
  In the above state, that is, in a state where the core material is suspended at the solid line position, the chuck claw 6 a of the chuck mechanism 6 is loosened and the core material is suspended in the chuck mechanism 6.As will be described in detail later with reference to FIG. 4, the structure of the chuck mechanism is important.
  The core material 3 penetrating the chuck 6 reaches the surface of the concrete 2 as indicated by an arrow b, and sinks into the concrete 2 by its own weight.
  When the dead weight settlement of the core material 3 is proceeding smoothly and quickly, the core material building device according to the present invention only needs to be stopped. However, the chuck mechanism 6, the guide roller 4b, and the guide shoe 4c (refer to FIG. 1 for details) function as a guide for lowering the core material in a vertical posture. That is, for example, the core material 3 is prevented from shaking in a pendulum shape due to a gust of wind.
[0029]
  While the core material 3 sinks its own weight to a predetermined depth, the penetration of the core material 3 into the concrete 2 is stopped or the penetration speed is remarkably reduced due to some circumstances (for example, hardening of the concrete). Then, when it is difficult to settle the dead weight (see also FIG. 1), the chuck cylinder 6b is operated to close the chuck claw 6a, and the chuck mechanism 6 grips the core material.
  The hydraulic cylinder 8 is extended to push down the core 3 strongly, thereby pressing into the concrete and promoting the building work.
  During the above press-fitting, the core material must receive the reaction force received from the concrete.Yes.
This embodiment, The reaction force received by the hydraulic cylinder 8 is received by the leader 7, and the leader 4 is supported by the arm 5a of the construction vehicle. In this way, the reaction force of the core press-fitting is supported by the construction vehicle that is the base machine.The
[0030]
In the vicinity of the technical field to which the present invention belongs, there is a so-called press-fitting type pile driving, and a technique of supporting a reaction force for press-fitting a pile into the ground with a hydraulic cylinder through an arm of the working machine. There was no specific idea yet.
In the present invention (see FIG. 1), the upward reaction force applied to the core member 3 is mainly supported by the arm 5a of the shovel car via the hydraulic cylinder 8. However, the gravity load of the chuck mechanism 6 and the gravity load of the leader 4 are also applied downward against the reaction force of the core material 3. Therefore, the construction vehicle does not support 100% of the reaction force in which the core is pressed into the concrete.
However, it should be noted that the role of the reader 4 in the present invention is limited to “support and guidance of the chuck mechanism and its driving means”. That is, one of the structural features is that the reader 4 is not equipped with equipment other than the core material press-fitting means (for example, an excavator such as an earth auger).
[0031]
Compared with known pile driving techniques, the present invention has the “difference in configuration” as described above. As a result, “difference in action and hardening” also appears, but more importantly, “ There is a difference in technical thought.
That is, the press-fitting pile driving device and the pile driving method try to press the pile into the natural ground forcibly. On the other hand, the present invention starts and subsides the core material into the artificially placed concrete, and assists and promotes the penetration of the core material when it is difficult to settle down. It is what.
Due to such fundamental differences in technical idea, the present invention differs in all of the purpose, configuration, action, and effect as compared with the press-fitting pile driving technique.
[0032]
In the present invention, when the core material can be settled by its own weight, no handling is performed. However, being in this auxiliary position does not significantly reduce the practical value of the present invention. The reason is as follows.
The work conditions for building a core material change in a complex manner depending on a wide variety of conditions, ranging from uncontrollable natural changes such as weather and design choices such as the composition of concrete. It is important to handle the change, while paying attention to the progress.
That is, (see FIG. 6A) When the present invention is not applied, when concrete 2 is driven into the trench 1 and a plurality of (M) core members 3 are sequentially built therein, There is a time difference between the time when the core material is penetrated into the concrete and the time when the last M-th core material is penetrated, and the hardening of the concrete progresses during this time.
For this reason, when the mixing composition of the concrete is selected so that the M-th core material can settle by its own weight, the concrete hardness when the first core material is subjected to its own weight settlement is softer than necessary. This means that it is disadvantageous in terms of the quality of the product (for example, continuous underground wall) and waste soil treatment because it uses concrete with less aggregate and much moisture.
[0033]
The final M-th core material is used when solidified concrete is used to eliminate the above disadvantages, improve product quality, reduce waste generation, reduce environmental pollution and reduce construction costs. The concrete must be hardened before it is installed, and the core material cannot be penetrated.
If the construction of the Nth core material stops before the construction of the Mth core material, serious damage will occur.
That is, the N-th core material is constrained by concrete at the lower half, and cannot penetrate or be pulled out. Furthermore, the concrete hardens before the remaining MN core materials are built. What happens if a continuous underground wall that lacks core material is formed? Considering the time, labor, and materials of crushing → removal → reconstruction, the loss is enormous.
The practical value of preventing such a serious situation is enormous. The practical effect of this actual form (FIG. 2) is precious even if at least a sense of security that there is no risk of falling into such a serious situation is obtained. From this point of view, in the core material building method according to the present embodiment, even if the core material building device is not operated, that is, even if the core material 3 is built to a predetermined position only by its own weight subsidence, Built-in equipment should be evaluated as fulfilling its role.
[0034]
FIG. 2 shows a state in which the core 4 is erected vertically with the reader 4 standing vertically. Although not shown in the drawings, the erection posture of the core material is not necessarily vertical, and a predetermined inclination angle may be given in design.
In such a case, if the reader 4 is held at the predetermined inclination angle, the core member 3 is built at a predetermined inclination angle in parallel with the reader.
Considering such inclined building, the present invention not only assists and promotes the self-weight subsidence, but also makes it possible to build a slant that cannot be achieved by the self-weight subsidence, and performs the building work safely and efficiently. That you can. It was possible to achieve a new effect that could not be expected in the past.
[0035]
In the present embodiment, an inclination angle sensor 25 is attached to the reader 4 as shown in FIG. This tilt angle sensor may be a system that reads an angle by visual observation or a system that outputs an electrical signal.
In the case of a tilt angle sensor of a visual reading type, an operator recognizes the tilt angle of the reader 4 by the tilt angle sensor and adjusts the tilt angle to a predetermined angle (for example, 0 degrees, for example, 15 degrees). The built-up inclination angle of the core material 3 can be adjusted to a predetermined angle.
In the case of an electrical output type tilt angle sensor, the output signal is input to an automatic control device (not shown), and the automatic control device causes the undulation cylinder of a construction vehicle (for example, excavator 5 in FIG. 3) as a base machine. The operation valve 5a is controlled to make the reader 4 have a predetermined inclination angle.
By controlling the inclination angle of the reader 4 as described above, a core material erection operation with a predetermined inclination angle can be performed.
[0036]
  FIG. 3 shows an embodiment in which the core material is built in the method different from that in FIG. 2 using the core material building device according to the present invention depicted in FIG. It is the figure which added the arrow showing the action | operation of this core material erection apparatus to the front view with the core material erection apparatus which supports this.
FIG. 3 also has a significance as a reference diagram for understanding the necessity of the present invention and the practical effects of the present invention.
  The core material 3 suspended by the crane 9 is suspended into the concrete 2 in the trench 1 as shown in the drawing, and is built under its own weight. Meanwhile, the core building device is waiting in the vicinity of the trench 1.
  If the core material 3 is built to a predetermined depth under its own weight, the task of the core material building device that has been waiting is completed.
  If for some reason it is difficult to sink the weight of the core material 3, the excavator 5 moves forward as indicated by the arrow f and approaches the trench 1, and grips the core material 3 by the chuck mechanism 6 (arrow g).
  When the core material 3 is gripped (see also FIG. 1), the hydraulic cylinder 8 is extended to press the core material 3 into the concrete.
[0037]
As an application example of the core material building method shown in FIG. 3, the core material building device is constructed in the sense of an ambulance in the event of a subsidence. There is also a process of waiting.
When such a construction method is applied to large-scale construction, cranes 9 are arranged at several locations, and the construction of the core material is carried out at each location, and the construction of the core material at these multiple locations is made into one core material construction. Can be supported.
[0038]
The operation described above with reference to FIGS. 2 and 3 is the operation of press-fitting the core material 3 into the concrete 2. However, when the press-fitting of the core material 3 is stopped halfway for some reason, the apparatus of the present invention is used. It is also possible to pull out the core material 3 from the concrete.
If the concrete hardens after the core material is pulled out, the subsequent procedure is troublesome, but still "the state in which the lower half of the core material 3 is solidified into concrete and the upper half protrudes into the air" Can be prevented, and the extracted core material can be reused.
When the core material 3 is pulled upward, the force of the hydraulic cylinder 8 can be effectively utilized by supporting the reaction force by the outrigger 27 shown in FIG.
[0039]
  When the shovel car 5 is advanced as in the embodiment shown in FIG. 3 and the core material 3 is gripped by the chuck 6 as indicated by the arrow g, the chuck 6 grips the core material from the side. The structure must be able to.
  FIG. 4 shows one embodiment of a chuck mechanism configured to be able to grip the core material from the side and release the grip, and the chuck mechanism guided by the reader is fitted to grip the core material. FIG. 6 is a diagram in which a chuck claw is added with a virtual line to a horizontal sectional view schematically drawn with a solid line.FIG. 4 shows the core part of the present invention.
  In the chuck mechanism 10, a support bracket 10b is integrally connected to a main body 10a having a U-shaped cross section that is fitted to the core member 3, and rollers 7 and 7 attached to the bracket 10b are provided as follows. Guided by the guide rail 4 b of the reader 4.
  A guide roller 10c and a guide roller 10d are provided on the inner side surface of the U-shaped main body 10a so that the core member 3 can be displaced relatively smoothly in the direction perpendicular to the paper surface. .
  The above relative displacement is effective when the U-shaped main body 10a is fitted to the core material 3 that has not yet completely stopped when the weight of the core material 3 is reduced.
  When the U-shaped main body 10a is externally fitted to the core member 3 as shown in the figure, and the web of the core member 3 is clamped by a pair of chuck claws 10e as depicted in phantom lines, the gripping operation is completed. .
  As shown in phantom lines with reference numerals 10f and 10g in FIG. 4, a chuck body having a U-shaped cross section is extended in the direction of the opening so that it can be sandwiched by covering the entire width dimension W of the core material 3. In addition to the construction, if the latch 31 is screwed by the hinge pin 32 so as to be rotatable as indicated by the reciprocating arrows i and j, the core material 3 can be gripped with a strong force.
[0040]
As described above, the core material 3 can be continuously pushed down into the concrete in the trench 1 in the correct vertical position and in the correct position by the hydraulic cylinder. When the descent driving of the core material 3 is stopped or decelerated remarkably, an oil hammer wave is generated as described below, and this oil hammer wave is introduced into the hydraulic chamber of the hydraulic cylinder, The construction of the core material 3 is completed by momentarily generating a strong hydraulic extension force, overcoming the resistance of the concrete, driving the core material 3 downward and pushing it into the concrete.
[0041]
FIG. 5 shows an example of a known technique for instantaneously increasing the extension force of the press-fitting cylinder using oil hammer waves and thereby driving the pile into the ground. It is the figure which added the hydraulic circuit for pile press-fit, the hydraulic circuit for oil hammer generation, and the control system for oil hammer generation.
The hydraulic pump 18 that is rotationally driven by the motor M sucks the hydraulic oil in the tank T and pumps it. The pressurized hydraulic oil is regulated to a rated pressure by a relief valve type pressure regulating valve 19 and supplied to the press-fitting cylinder 11 through an operation valve 21.
A chuck 5 ′ is attached to the lower end portion of the piston rod of the press-fitting cylinder and holds the pile 16.
When the press-fitting cylinder 11 is extended by operating the operation valve 21, the pile 16 is press-fitted into the ground 17, and when the press-fitting cylinder 11 is contracted, the pile 16 is pulled out from the ground 17.
[0042]
The structure and function described above with reference to FIG. 5 are general known hydraulic circuit components that do not include an oil hammer circuit.
In the example of FIG. 4, when a large load (resistance of the ground 17) is applied to the press-fit cylinder 11 and the press-fit cylinder 11 is prevented from extending, the pressure oil that has passed through the operation valve 21 enters the press-fit cylinder 11. Since it cannot flow, the oil hammer circuit solenoid valve 23 and the oil hammer circuit pressure regulating valve 26 are circulated and returned to the oil tank T. Thereby, the steady flow of the direction of arrow d and arrow e has generate | occur | produced.
The oil hammer circuit solenoid valve 23 is an open / close valve type solenoid valve controlled by the oil hammer circuit controller 24, and is kept in a normal state (when no oil hammer is generated).
[0043]
Even if the oil hammer circuit solenoid valve is opened and the steady flow indicated by the arrows d and e is generated, the oil hammer circuit pressure regulating valve 26 is provided in the flow channel of the steady flow. The hydraulic oil in the high-pressure side pipe is maintained at almost the rated pressure.
In this state, when the oil hammer circuit solenoid valve is suddenly closed, an oil hammer wave is generated on the upstream side and guided as indicated by arrows a and b, and the arrow c enters the cylinder bottom hydraulic chamber of the press-fit cylinder 11. It is applied as follows.
The oil hammer wave is an instantaneous pressure pulse wave and its flow rate is very small, but the peak value of the pressure waveform is significantly higher than the rated pressure of the hydraulic pump 18. Thereby, the extension force of the press-fitting cylinder 11 increases remarkably instantaneously, and the pile 16 is press-fitted into the ground 17.
[0044]
The amount of oil in one oil hammer wave is very small, and the press-fitting cylinder 11 does not produce a stroke sufficient to visibly lower the pile 16, but if the pile 16 descends even with a small dimension, the pile The static friction between the ground 17 and the pile 16 that constrained the 16 is changed to dynamic friction, the friction coefficient is reduced, and the pile 16 becomes easy to move.
And when the pile 16 becomes easy to move as described above, even if the pulse of the oil hammer wave guided to the cylinder bottom chamber of the press-fitting cylinder 11 disappears, “the oil is discharged from the hydraulic pump 18 and regulated by the pressure regulating valve 19. In addition, since the pressure of the hydraulic oil at the rated pressure is constantly applied to the cylinder bottom chamber of the press-fitting cylinder 11, the pile 16 that has become easy to move due to the reduction of the friction coefficient uses the oil hammer wave as a priming water, Continue sinking into the ground 17. This continuation is difficult to perpetuate, but serves to amplify the subsidence of micro dimensions caused by oil hammer waves.
Still, the extension dimension of the press-fitting cylinder 11 triggered by one oil hammer wave is a small amount of millimeters to centimeters, but the oil hammer circuit solenoid valve 23 is repeatedly opened and closed by the action of the oil hammer circuit controller 24. Then, when the oil hammer is generated in a short cycle of a second unit or less, the press-fitting cylinder 11 extends at a speed that is visible.
[0045]
(See FIG. 5) The hydraulic pressure source of this embodiment is supplied from the shovel car 5 shown in FIG. Construction vehicles generally have a hydraulic cylinder and a hydraulic motor for driving a work machine, and are provided with means for supplying pressure oil to the construction vehicle.
I. To use the self-propelled function,
B. It is also convenient for supporting the reaction force of core material press-fitting,
C. It is also advantageous that it can be supplied with pressure oil.
The hydraulic pump 18, the pressure regulating valve 19, the operation valve 21, and the hydraulic oil tank T illustrated in FIG. 5 are configured to be used for core material press-in by borrowing the equipment of the shovel car 5 (FIG. 1).
Other components dedicated to oil hammer generation, that is, the oil hammer circuit solenoid valve 23, the oil hammer circuit controller 24, the oil hammer circuit pressure regulating valve 26, and the pilot check valve 22 are provided in the valve stand 28 shown in FIG. It is stored.
The valve stand 28 is attached to the reader 4 via a cushioning material. In this example, a vibration-proof rubber is used as a buffer material. However, when the present invention is carried out, the material and structure of the buffer material are not particularly limited.
The vicinity of the cylinder bottom of the hydraulic cylinder 8 is fixedly installed on the valve stand 28.
Due to such a structure, the reaction force of static pressure input of the hydraulic cylinder 8 is supported by the weight of the shovel car 5 through the valve stand 28, the buffer material (not shown), the leader 4 and the arm 5a in this order. But
The shocking extension force of the hydraulic cylinder 8 due to the occurrence of the oil hammer described above is mainly supported by the inertial force of the valve stand 28 (the rate at which the shock force is transmitted to the reader 4 by the action of the buffer material is small). Therefore, penetration of the core material can be effectively promoted by oil hammer without exerting a harmful impact load on the leader 4 and others.
[0050]
【The invention's effect】
  Claim1According to the inventive device, when the settlement due to the dead weight of the core material suspended and built in the concrete by the crane is stagnant or difficult, the core material is effectively supported to penetrate into the concrete, It can be built up to a predetermined position with an accurate posture.
  As the core material penetrates into the concrete as the building work progresses, the buoyancy received by the core material increases, and in addition, the concrete hardens as time passes. Becomes increasingly difficult.
  In addition, if the composition of the ingredients is changed so as to improve the quality of the concrete, the fluidity of the concrete before hardening decreases, and it becomes more difficult to settle down by its own weight.
  This claim1The fact that the inventive device supports the penetration of the core material means that the work efficiency is improved by facilitating the core material construction work,
  Furthermore, it has the significance of making it possible indirectly to improve the concrete quality by increasing the cement content in the concrete mixing ratio and decreasing the water content.
  In addition, facilitating the press-fitting of the core material into the concrete with low fluidity makes it possible to use concrete with a high proportion of aggregate.
  When excavating trenches, sieving generated soil to separate aggregate, and mixing concrete using the aggregate, the ability to use large amounts of aggregate reduces the amount of earth and sand discarded Let me.
Since the structure of the present invention is characterized by the chuck mechanism and the shape and size of the chuck body having a U-shaped cross section can be fitted on the core material, it is “suspended by a crane and built in concrete. The core material can be gripped from the side of the “core material”.
Conventionally, there is no chuck for gripping the core material for press-fitting, so it cannot be compared, but a known device for gripping a long steel material has a structure in which the steel material is suspended by a crane and inserted into the chuck. Met. Compared to this, the chuck mechanism of this claim can be entered and gripped in the middle of the erection work.
When constructing the core material, the core material construction device according to the present invention is not absolutely necessary, and if it is necessary, it will be supported, and if it is not necessary, it will be entrusted to the self-weight subsidence of the core material. The construction of this claim must be such that the core material during the construction work can be gripped from the side.
Furthermore, the device of the present invention can move relative to the core material in a “state in which the grip is released” by the roller that guides the core material (the vertical movement of the core material is not constrained).
By utilizing this action, when the core material is sinking its own weight, it is left to the sinking of its own weight while guiding with a roller, and when the sinking of its own weight is difficult, the core material is immediately gripped and press-fitted. "Quick work on building core material" is now possible.
[Brief description of the drawings]
FIG. 1 shows the core material according to the present invention.It is the whole front view on which the state where the device is used is drawn.
[Fig. 2] Built-in core material depicted in Fig. 1 aboveOnlyIt is shown to explain the working condition of the device. The core material suspended by the crane is added to the overall front view of the core material building device.The
3 is depicted in FIG. 2 above.It is a reference figure for showing the work state of a core erection device, and explaining necessity and an effect of the present invention.
[Fig. 4]It is the horizontal sectional view on which the principal part of the core erection device concerning the present invention was drawn.
FIG. 5 shows an example of a known technique for instantaneously increasing the extension force of a press-fitting cylinder using an oil hammer wave and thereby driving a pile into the ground. It is the figure which added the hydraulic circuit for pile press-fit, the hydraulic circuit for oil hammer generation, and the control system for oil hammer generation.
FIG. 6 is a view showing a conventional technique for constructing a continuous underground wall and a problem in the conventional technique. FIG. 6 (A) is a two-sided view illustrating a completed continuous underground wall. B) is a vertical cross-sectional view in a state where the construction of the core material is started, (C) is a vertical cross-sectional view in a state where the core material is being constructed, and (D) It is a vertical sectional view in a state where the core material is biased.
[Explanation of symbols]
1 ... trench
2 ... concrete
3. Core material
4 ... Leader
4a, 4b ... guide rail
5 ... excavator car
5a ... arm
6 ... Chuck mechanism (abbreviation: chuck)
6a ... Chuck claw
6b ... Chuck cylinder
6c ... Chuck arm
7 ... Laura
8 ... Hydraulic cylinder
9 ... Crane
10 ... Chuck mechanism
10a ... U-shaped body in cross section
10b ... Bracket
10c ... Side roller
10d ... Guide roller
10e ... Chuck claw
10f, 10g ... extension
11 ... Press-fit cylinder
16 ... Pile
17 ... Ground
18 ... Hydraulic pump
19 ... Pressure control valve
20 ... Check valve
21 ... Control valve
22 ... Pilot check valve
23. Oil hammer circuit solenoid valve
24. Oil hammer circuit controller
25. Inclination angle sensor
26 ... Oil hammer circuit pressure regulating valve
27 ... Outrigger
28 ... Valve stand
31 ... The premium
32 ... Hinge pin
a, b, c: arrows indicating the course of the oil hammer wave
d, e: arrows representing the circulation path of hydraulic oil
f ... Arrow indicating the forward direction of the excavator
g ... Arrow indicating the direction of gripping the core material
T ... Hydraulic oil tank

Claims (1)

A chuck mechanism that supports the core material built into the concrete so that it can be gripped and released; and
A reader for guiding the chuck mechanism to move in parallel;
A hydraulic cylinder that reciprocates along the reader with the chuck mechanism;
A hydraulic circuit including a hydraulic pump and control valves for supplying pressure oil to the hydraulic cylinder,
The leader can be attached to an arm configured as a construction machine attachment for a construction vehicle, and the leader is not equipped with an earth auger or a drilling device similar to the earth auger. ,
Furthermore, the chuck mechanism is
A chuck body with a U-shaped cross-section with a shape and dimensions that fits around the core;
A roller member for guiding the core material so as to be movable in the longitudinal direction;
A chuck claw that clamps the core material so that it can be gripped and released; and
And a roller member that supports the U-shaped chuck body and guides the guide body along the guide rail of the leader .

Images