JP2004076301A - Hammer grab bucket and excavation method in steel pipe using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hammer grab beneficial in cost and an excavation method in a steel pipe using the same enhancing the operability and eliminating the impulse sound, without replacing the hammer grab itself even in the case where the diameter and length are different from each other in the method of excavating in a steel pipe as a casing. <P>SOLUTION: An upper pulley block 15 is attached to the inside of a cylindrical upper frame 11 and a lower pulley block 17 is attached to the inside of the lower frame 12. A weight 16 is detachably arranged at the outside lower part of the upper frame 11. The excavation method in the steel pipe using the hammer grab is provided as a base means in which a shell mounting frame 13 is detachably fixed to the lower side of the lower frame 12 to arrange openably/closably a pair of shells 14 constituted of right and left symmetrical shells. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
In the method of excavating the inside of a steel pipe as a casing using a hammer grab, the present invention easily copes with changes in the diameter of the steel pipe by replacing necessary members such as shells having various sizes as attachments as needed. The present invention relates to a hammer grab that can be used and a method for excavating in a steel pipe using the hammer grab.
[0002]
[Prior art]
Conventionally, in the cast-in-place pile method and other foundation works, means for excavating a steel pipe as a casing driven into the ground using a hammer grab has been used. For example, as shown in the working state diagram of FIG. 14, a hammer grab 7 in which a steel pipe 3 is driven into the ground 1 using a casing excavator 2 and a weight is incorporated by a suspension wire 6 hanging from the tip of a jib 5 of a crane 4. Is suspended and lowered into the steel pipe 3, and the shell opening / closing wire 8 is driven to perform excavation in the ground by the shell 14.
[0003]
The type of the steel pipe 3 as a casing is determined by the specifications of the construction work to be performed. There are various types of steel pipe diameters such as φ1000, φ1200, φ1300, φ1500, φ1800, φ2000, and hammers corresponding to this steel pipe diameter. A method of selecting a grab 7 and performing excavation work is generally used.
[0004]
[Problems to be solved by the invention]
However, the above conventional excavation method in the steel pipe has to change the hammer grab 7 itself according to the diameter of the steel pipe 3 which differs depending on the construction specifications. Preparing the model hammer grab 7 in advance is disadvantageous in terms of cost and has a problem that the operation at the time of replacement is troublesome.
[0005]
In addition, the conventional hammer grab has a crown and a crown head because the suspension wire is a single rope, and a noise problem may occur due to an impact sound when the crown and the crown head are attached and detached. There are also challenges.
[0006]
Therefore, in view of the above circumstances, the present invention can easily cope with the case where the diameter of the steel pipe differs depending on the construction specifications without exchanging the hammer grab itself, and enhances operability and emits an impact sound. It is another object of the present invention to provide a hammer grab which is advantageous in terms of cost and a method for excavating steel pipes using the hammer grab.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention attaches an upper pulley block inside a cylindrical upper frame, attaches a lower pulley block inside the lower frame, and detachably disposes weights on the outer lower side of the upper frame. A hammer grab in which a shell mounting frame is detachably fixed to a lower side of a frame and a pair of shells having a bilaterally symmetrical configuration is arranged to be openable and closable, and a steel pipe excavation method using the hammer grab is provided as basic means.
[0008]
The entire suspension is supported by a support rope via a suspension wire attached to the upper surface of the upper frame, while the open / close rope is guided from the lower pulley block to the upper frame via the respective pulleys of the upper pulley block via guide rollers. It is connected to the socket.
[0009]
In the present invention, a steel pipe as a casing is driven into the ground, a hammer grab incorporating a weight is suspended by a suspension wire and lowered into the steel pipe, and the shell opening / closing wire is driven to excavate the ground with the shell. In the excavation method, the shell is removed from the shell mounting frame, the weight is removed from the outer lower side of the upper frame, a shell having a different diameter is mounted on the shell mounting frame, and the weight is replaced and mounted. The grab can be modified to fit steel pipes with different diameters. It is also possible to replace the shell mounting frame together with the shell and attach it to the lower side of the lower frame so that the hammer grab is adapted to steel pipes having different diameters.
[0010]
According to such a hammer grab and a steel pipe excavation method using the hammer grab, a steel pipe as a casing is driven into the ground, and the entire hammer grab is suspended by a support rope via a suspension wire and lowered into the steel pipe. When the open / close rope is wound up from the shell, the shell closes, so that the steel pipe can be excavated using a hammer grab. When changing the hammer grab to accommodate different steel pipe diameters as the casing, the shell is removed with the lever, and the weight is also removed from the lower outside of the upper frame. Next, the other shell is mounted on the shell mounting frame using the tie rod mounting pin and the shell mounting pin together with the lever, and the changing operation is completed by mounting another weight. It is also possible to attach the shell after replacing the shell mounting frame.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 is a fully opened cross-sectional view of an example in which a hammer grab according to the present invention is used as a casing and adapted to a steel pipe diameter of φ1000, FIG. 2 is a fully closed cross-sectional view of the bucket, and FIG. 3 is an assembled view. In the figure, 11 is a cylindrical upper frame, 12 is a cylindrical lower frame, 13 is a shell mounting frame, and 14 is a pair of shells in a symmetrical configuration. An upper pulley block 15 is attached inside the upper frame 11, and weights 16, 16 are disposed on the outer lower side of the upper frame 11.
[0012]
A lower pulley block 17 is attached to the inside of the lower frame 12, and the lower pulley block 17 is movable up and down via a guide bar 18. The pulley shaft 17 a of the lower pulley block 17 is connected to the weights 16, 16 using connecting rods 19, 19, pins 20, 20 and pins 21, 21. The shell 14 is attached to the shell mounting frame 13 using a pin 22 so as to be freely opened and closed. The lower side portion 17b of the lower pulley block 17 and the levers 14a and 14a of the shell 14 are connected to the rods 23 and 23 and the pin. 24, 24 and pins 25, 25 are used for connection.
[0013]
4 is a front view of FIG. 3, FIG. 5 is a front view thereof, FIG. 6 is a view of FIG. 4 E, and a guide roller 26 and a suspension ring 27 are attached to the upper surface of the upper frame 11. The support rope 28 supports the entire hammer grab via a suspension wire 29 of the suspension ring 27. Reference numeral 30 denotes an opening / closing rope, and the opening / closing rope 30 is connected to the socket 31 on the upper frame 11 through the guide roller 26 through the pulleys of the lower pulley block 17 and the upper pulley block 15. The guide roller 26 has a function of preventing wear and damage due to threading of the opening / closing rope 30. 7 is a BB sectional view of FIG. 3, FIG. 8 is a CC sectional view, and FIG. 9 is a DD sectional view.
[0014]
FIG. 10 is an assembly diagram of a hammer grab adapted to a steel pipe diameter of φ1200 as a casing, FIG. 11 is an assembly diagram when adapted to a steel pipe diameter of φ1300, and FIG. 12 is a case of fitting to a steel pipe diameter of φ1500. FIG.
[0015]
When such a hammer grab is used, a steel pipe as a casing is driven into the ground in a cast-in-place pile or other foundation work, and then the entire hammer grab is suspended by a support rope 28 via a suspension wire 29 of a suspension ring 27 and the inside of the steel pipe. When the open / close rope 30 is loosened after being lowered to the lower position, the lower pulley block 17 and the rods 23 and 23 are lowered by the weights of the weights 16 and 16 and the lever 14a is pushed downward to open the shell 14 as shown in FIG. . Then, by winding up the opening / closing rope 30, the lower pulley block 17 moves to the upper position shown in FIG. 2, the lever 14a moves upward via the rods 23, 23, and the shell 14 closes. By repeating this operation repeatedly, the inside of the steel pipe can be excavated using a hammer grab.
[0016]
The weights 16 and 16 assist the opening and closing operation of the shell 14, increase the gripping force with an increase in the tension of the opening and closing rope 30 on the closing side, and increase the opening speed by increasing the weight on the opening side. And since the impact at the opening end can be taken greatly, the mud or the like is prevented from adhering to the shell 14 even in the ground having a large adhesion force such as mud or the like. When the hanging wire 29 is lowered and wound, the hammer grab is slightly inclined, but can be guided and corrected by the shell 14 on the lower side and the weights 16 and 16 on the upper side. Therefore, the weights 16, 16 also serve as hammer grub guide members.
[0017]
In the hammer grab according to the present invention, the support rope 28 and the opening / closing rope 30 are both composed of two pieces, so that the crown and the crown head in the conventional example are unnecessary, and no impact sound is generated during the detaching operation. There is no noise problem. Furthermore, the shell 14 can be opened and closed any number of times, and the earth and sand can be re-gripped.
[0018]
Next, with reference to FIG. 1 and FIG. 13, an operation for changing the hammer grab to a steel pipe diameter of φ1000 to φ1200 as a casing will be described. First, the pins 22 and 25 in FIG. 1 are extracted, and then the shell 14 for φ1000 is removed together with the lever 14 a as shown in FIG. 13, and the weights 16 and 16 are also removed from the outside lower side of the upper frame 11. Next, the φ1200 shell 14c is mounted on the shell mounting frame 13 by using the tie rod mounting pin 25 and the shell mounting pin 22 together with the lever 14b, and the φ1200 weights 16a and 16a are mounted to perform the changing operation. finish.
[0019]
When changing the hammer grab from φ1000 to φ1300 or φ1500, the shell mounting frame 13a suitable for φ1300 is replaced as shown in FIGS. 14e is mounted on the shell mounting frame 13a using the tie rod mounting pin 25 and the shell mounting pin 22, respectively, and is replaced with φ1300 weights 16b and 16b and φ1500 weights 16c and 16c.
[0020]
【The invention's effect】
According to the present invention described above, a steel pipe as a casing is driven into the ground, the entire hammer grab is suspended by a support rope and lowered into the steel pipe. When drilling with a hammer grab and changing the hammer grab to fit different steel pipe diameters, remove the shell and weight and attach the other shell to the shell mounting frame along with the lever, The change operation can be completed by attaching another weight. Therefore, it is not necessary to replace the hammer grab itself according to the length of the steel pipe, which differs depending on the construction specifications, and there is no need to prepare various types of hammer grabs in advance. The operation at the time is easy, and there is no possibility of causing a noise problem due to an impact sound during the operation.
[0021]
Therefore, according to the present invention, even if the diameter of the steel pipe is different depending on the construction specifications, it is not necessary to replace the hammer grab itself, so that the operability is improved and no impact sound is generated, which is advantageous in terms of cost. A hammer grab and a method for excavating a steel pipe using the hammer grab can be provided.
[Brief description of the drawings]
FIG. 1 is a full sectional view of a bucket in an example in which a hammer grab according to the present invention is adapted to a steel pipe diameter of φ1000.
FIG. 2 is a cross-sectional view of the bucket in FIG. 1 fully closed.
FIG. 3 is an assembly drawing of a hammer grab according to the present invention.
4 is a view as seen from an arrow A in FIG. 3;
FIG. 5 is a front view of FIG. 4;
6 is a view taken in the direction of arrow E in FIG. 4;
7 is a cross-sectional view taken along line BB in FIG.
8 is a cross-sectional view taken along the line CC of FIG.
9 is a sectional view taken along the line DD of FIG.
FIG. 10 is an assembly drawing of a hammer grab adapted to a steel pipe diameter of φ1200.
FIG. 11 is an assembly drawing of a hammer grab adapted to a steel pipe diameter of φ1300.
FIG. 12 is an assembly drawing of a hammer grab adapted to a steel pipe diameter of φ1500.
FIG. 13 is an exploded view of the main part for explaining the operation when changing the hammer grab to adapt to different steel pipe diameters.
FIG. 14 is a working state diagram when excavating using a normal hammer grab.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Upper frame 12 ... Lower frame 13, 13a ... Shell attachment frame 14, 14c, 14d, 14e ... Shell 14a, 14b ... Lever 15 ... Upper pulley block 16, 16a, 16b, 16c ... Weight 17 ... Lower pulley block 18 ... Guide bar 19 ... Connecting rod 23 ... Rod 26 ... Guide roller 27 ... Suspension ring 28 ... Support rope 29 ... Suspension wire 30 ... Opening / closing rope 31 ... Socket reference number P3463

Claims (5)

The upper pulley block is installed inside the cylindrical upper frame, the lower pulley block is installed inside the lower frame, the weight is detachably placed on the lower outside of the upper frame, and the shell mounting frame is attached on the lower side of the lower frame. A hammer grab characterized in that a pair of shells which are fixed freely and have a symmetrical configuration are arranged to be openable and closable. The upper pulley block is installed inside the cylindrical upper frame, the lower pulley block is installed inside the lower frame, the weight is detachably placed on the lower outside of the upper frame, and the shell mounting frame is attached on the lower side of the lower frame. A pair of shells that are freely fixed and symmetric are arranged so as to be openable and closable, and are suspended by a support rope via a suspension wire attached to the upper surface of the upper frame, while the opening and closing rope has a guide roller. A hammer grab connected to the socket on the upper frame through the respective pulleys of the upper pulley block from the lower pulley block. A steel pipe as a casing is driven into the ground, a hammer grab with a built-in weight is suspended by a hanging wire and lowered into the steel pipe, and the shell opening / closing wire is driven to excavate the ground with the shell. In the method
Remove the shell from the shell mounting frame and remove the weight from the outside lower side of the upper frame, and attach the shell with different diameter length to the shell mounting frame and replace the weight to install the hammer grab with different diameter length A drilling method in a steel pipe using a hammer grab, which is modified to be adapted to the steel pipe. A steel pipe as a casing is driven into the ground, a hammer grab with a built-in weight is suspended by a hanging wire and lowered into the steel pipe, and the shell opening / closing wire is driven to excavate the ground with the shell. In the method
The upper pulley block is installed inside the cylindrical upper frame, the lower pulley block is installed inside the lower frame, the weight is detachably placed on the lower outside of the upper frame, and the shell mounting frame is attached on the lower side of the lower frame. A hammer grab is configured by opening and closing a pair of shells that can be opened and closed symmetrically and configured to be openable and closable. A hammer grab that is modified to fit a steel pipe with a different diameter by attaching the shell to the shell mounting frame using the tie rod mounting pin and the shell mounting pin and replacing the weight. Drilling method in steel pipe using. The method for excavating a steel pipe using a hammer grab according to claim 3 or 4, wherein the shell mounting frame is exchanged together with the shell and attached to the lower side of the lower frame so that the hammer grab is adapted to steel pipes having different diameters.

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