JPH06317079A - Hammer grab for cast-in-place pile construction - Google Patents

Abstract

PURPOSE:To increase the take-in amount of excavated earth and sand by installing an elevating/sinking frame which elevates and sinks in association with the motion of a wire rope within the body of a hammer grab, furnishing a plurality of links to transmit the motion of the frame to a pair of shells, and coupling one-side ends of these links with the two ends of each shell. CONSTITUTION:In the condition that a latch 3 installed at a hammer grab is hitched at a hitch piece 12, the body 1 of the hammer grab is hung by a wire rope 17. At this time, shells 20 are in opened condition, and if the wire rope 17 is paid off to permit the grab body 1 to fall, the shells 20 bite into the earth deeply, so that the take-in amount of the excavated earth and sand increases wherein the earth and sand have no risk of extruding from the joining faces of the shells 20. When the shells 20 bite into the earth, their tips receive a vertical load due to collision with the ground, but because the two ends of each shell 20 are coupled with links 36 and the shells 20 are supported on an elevating/sinking frame 6 through the links 36 and a beam 30, the load is transmitted to the frame 6 from the ends of the shells 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hammer mug for use in cast-in-place pile construction such as an orcasing method.

[0002]

2. Description of the Related Art The ortho-casing method is one in which a casing pipe made of steel with a drilling claw at the lower end is rotated or rocked to be installed in the ground, and when the upper end of the casing pipe descends to a predetermined position, another operation is performed. Is a method of drilling a vertical hole for placing concrete to be a pile by repeating the work of excavating the earth and sand in the casing pipe with an excavator for medium excavation and discharging the soil. Hammer grabs are used for such excavating tools for medium digging as the all casing method.
Shown in. In FIG. 3, reference numeral 1 is a main body of the humbug club, 2 is a cylinder for suspension, which is slidably attached to a bracket 11 fixed to the upper part of the main body of hammer 1 over a predetermined vertical width, and 13 is a cylinder for suspension 2 attached downward. It is a spring that urges. Reference numeral 3 is a latch of a suspension supporting cylinder 2 for hanging a latch 12 which will be described later. The latch 3 is attached to the bracket 11 by a pin 3a.
It is attached so as to be rotatable around. Reference numeral 5 denotes an upper sheave rotatably mounted on the upper portion of the inside of the humbug club body 1 via a shaft 4, 6 is an elevating frame attached to the lower portion of the inside of the hanger grab body 1 so as to be capable of moving up and down, and 8 is an axis for the elevating frame 6. A lower sheave rotatably mounted via 7, and a spring 9 provided between a supporting member for supporting the shaft 4 and the elevating frame 6.

Reference numeral 17 is a wire rope wound around a winch provided in a crane or the like, 14 is a chain attached to the wire rope 17 through a swivel joint 16, and 10 is one end in the upper portion of the hammer grab body 1. A wire rope 12 connected between the lower sheave 8 and the upper sheave 5 is connected via a pin 23, and the wire rope 12 is provided between the other end of the wire rope 10 and the chain 14. It is an intermediary premium.

Reference numeral 20 denotes a shell which is openably and closably mounted on the lower left and right portions of the main body 1 of the hammer via the pins 18, and as shown in FIG. 4, the shell 20 has an arc shape. Reference numeral 19 denotes an arm portion having one end fixed to the central portion of the inner surface of each shell 20,
Reference numeral 22 designates the center of the lower end of the main body 1 of the hanger and each shell 20.
Is a plurality of links connecting the arm part 19 and the arm part 19 via pins 21 and 21.

3 and 4 are inserted into the casing pipe used in the all-casing construction method and dropped from above, and the shell 20 is hard to be excavated by the falling energy. No, wire rope 1
By moving 7 up and down, each shell 20 is opened and closed to excavate earth and excavate soil.

[0006] The shell 20 has a sharp tip, and has a shape that is difficult to insert into the ground. Therefore, when it is dropped from above, it contacts the ground first, so that the arm member 19 is formed at the center of the arc forming the shell 20 so that the force received thereby can be efficiently transmitted to the main body 1.
And a link 22 is attached to the tip of the arm portion 19.

[0007]

In the structure of this conventional shell, as shown in FIG. 4, when the shell 20 is opened, the arm portion is close to the center of the circular arc drawn by the two shells 20. 19 is overhanging, and when the shell 20 is opened and the hammer mug is dropped to make it hard to get into the ground,
There is a problem that the arm portion 19 interferes and the shell 20 cannot be deeply embedded in the ground. Further, when the shell 20 is closed and the excavated earth and sand is to be taken into the shell 20, there is a problem that the arm portion 19 and the link 22 become an obstacle, and the earth and sand stick out from the mating surfaces of the shells 20 and may be missed. . Also, the shell 20
When the shell is closed, the excavated earth and sand may wrap around above the arm portion 19 and the link 22, and when the shell 20 is opened and discharged, the digging that wraps around above the arm portion 19 and the link 22. When the earth and sand do not fall and especially sticky earth and sand, the hammer mug must be violently shaken up and down, which causes a problem that noise is generated. In addition, the shell 20
The center part of the arc is strong because it has the arm part 19, but the end is weak because it is open, and when it falls, this part collides with a large boulder, or when the shell is closed, the boulder grips. There was a problem that it was easily deformed by some people.

The present invention has been made in view of the above problems, and provides a hammer mug for cast-in-place pile construction, which can improve the uptake performance and excretion performance of excavated soil and is also excellent in strength. The purpose is to

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention drops a Hammaglab suspended by a single wire rope, and lowers the Hammaglab main body attached to the lower end of the Hammaglab body by the fall energy. A pair of shells having sharp tips are embedded in the ground, and the shells are opened and closed along with the upper and lower sides of the wire rope to excavate the earth and sand, and the soil is excavated. And a plurality of links for transmitting the movement of the lifting frame to the pair of shells, one end of each link being connected to both ends of each shell. Is characterized by.

[0010]

Since the present invention has the above-mentioned structure, when the wire rope is unwound from the state where the shell is closed and the elevating frame is lowered with respect to the main body of the hammer, the link with one end connected to both ends of the pair of shells is The shell opens through. In this state, when the wire rope is extended to drop the hammer mug and make the shell hard to get into the ground,
Since there is no link in the inner space between the shells, the link does not increase the resistance of the shell to bite into the ground,
The shell is deep and difficult to reach. In addition, if the wire rope is wound up and the lifting frame is lifted with respect to the main body of the hanger grab from the state where the shell is difficult to fit in the ground, both ends of the shell will be pulled and closed via links, but the arm part will be inside the shell. Since there is no sand, a large amount of earth and sand is stored between the shells, and the links are connected to both ends of the shells, so that they do not interfere with earth removal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a hammer mug for cast-in-place pile construction according to the present invention will be described with reference to FIGS. 1 and 2A to 2C. In the present embodiment, a hammer mechanism 1, a lifting frame 6 and a lifting mechanism using the wire rope 10,
The latching mechanism of the latch 12 between the wire rope 10 and the chain 14 by the latch 3 and the like have exactly the same structure as the hammer mug shown in FIG.

Reference numeral 20 denotes a pair of shells, 32 denotes a lower cylindrical body which is a lower structural body of the Humma grab body 1, and the shell 2
Reference numeral 0 denotes a central portion of which is attached to the lower left and right portions of the lower tubular body 32 via a pin 18 so as to be openable and closable. A beam 30 is fastened to the elevating frame 6 and bolts 31, and the beam 30 has a shape in which both ends are lowered. 32
Reference numeral a is a guide groove which is vertically provided on both sides of the lower cylindrical body 32 and which guides the T-shaped portions 30a at both ends of the beam 30. 32b is a rib for reinforcing the left and right of the groove 32a, 32c is a rib for reinforcing the lower tubular body 32, 32d is a drain hole, 36
Are attached to the T-shaped portions 30a at both ends of the pin 30 and the brackets 20a provided at both ends of the circular arc portion of the shell 20, respectively.
It is a link connected by 4, 35.

Further, 20b is a plate for reinforcing the outer peripheral portion of the lower edge of the shell 20, 20c is a plate for reinforcing the inner peripheral portion of the upper edge of the shell 20, and 20d is the center of the arc portion of the shell 20. It is a vertical rib to reinforce.

Next, the operation of the present invention will be described with reference to FIGS. 1 and 2.
Will be specifically described in accordance with. As shown in FIG. 1, when the latch 3 provided on the hammer tab of the present invention is hooked on the latch 12, the wire rope 17 suspends the hammer tab body 1. At this time, each shell 20 is in an open state, and when the wire rope 17 is unrolled and the hammer mug main body 1 is dropped, the shell 20 is difficult to dig into the ground due to the falling energy. Since there is no arm portion 19 as described above, the shell 20 can be deeply inserted into the soil, and the arm portion does not obstruct the earth and sand from protruding from the mating surface of the shell 20, so that the excavated earth and sand can be taken in. The amount increases. Further, when the shell 20 is pushed into the ground, the tip of the shell 20 receives a vertical load due to a collision with the ground. Both ends of the shell 20 are connected to the link 36, and the shell 20 includes the link 36 and the beam 30. Since it is supported by the elevating frame 6 via the, the load received at the tip of the shell 20 is transmitted to the elevating frame 6 from both ends of the shell 20. Further, since both ends of the circular arc of the shell 20 are supported by the links 36, the strength is increased and the shell 2 is protected against boulders or the like.
The deformation of the shell 20 when 0 collides can be prevented. In the present embodiment, a plate 20b for reinforcing the outer peripheral portion of the lower end edge of the shell 20 and the shell 20
Since the plate 20c for reinforcing the inner peripheral portion of the upper edge of the shell is provided, the strength of the shell 20 is further increased, and the deformation of the shell 20 due to boulders or the like can be more reliably prevented. Further, in this embodiment, since the vertical ribs 20d for shell reinforcement are provided inside the shell 20, the shell 20
The shell portion between the tip of the shell and the pins 18 provided on the left and right sides of the lower end of the hanger mug body 1 is strengthened, so that the shell 20 is less likely to be deformed, and the load is transmitted to the hanger mug body 1 through the pins 18 smoothly. be able to.

As described above, when the shell 20 is pushed into the ground, the wire rope 17 is slightly loosened due to the inertial force and the timing difference for applying the brake of the winch. As a result, the suspension support cylinder 2 is lowered by the spring force of the spring 13, the latch 3 is rotated about the pin 3a as shown by the arrow a in FIG. 1, and the inner end of the latch 3 is rotated downward to engage the latch. Off 12

When the wire rope 17 is wound while the latch 12 is disengaged from the latch 3 as described above, the swivel joint 16 connected to the wire rope 17 and the lifting chain.
The wire 14 and the wire rope 10 are also wound up together, and the latch 12 is pulled out upward from the suspension supporting cylinder 2. Since the wire rope 10 is hung between the lower sheave 8 attached to the elevating frame 6 and the upper sheave 5 attached to the main body 1 of the hammer drum, the elevating frame 6 is also elevated. Be raised to. As a result, the beam 30 fastened to the elevating frame 6 by the bolts 31 moves upward with the T-shaped portions 30a at both ends being guided by the vertical grooves 32a provided in the lower tubular body 32. Then, the shell 20 is pulled to the center via a link 36 that is connected to both ends of the T-shaped portion 30a by a pin 34 and is also connected to a bracket 20a provided on the shell 20 and a pin 35, whereby the tip is caught in the excavated ground. The earth and sand are scraped to the center by the respective shells 20 in this state, and finally the earth and sand are sandwiched between the respective shells 20, and the earth and sand are bid up and taken into the upper inside of the shell 20.

Here, when the earth and sand are taken in by the shell 20, the earth and sand can be taken up to the upper side because there is no arm portion described in the prior art in the center inside the shell 20. Further, since the links 36 are connected to both ends of the circular arc of the shell 20, it is possible to scrape earth and sand while supporting the entire shell 20 and prevent damage such as deformation of the shell 20.

When the shell 20 is closed and soil is taken in as described above, the spring 9 for urging the shell opening direction is compressed,
When the wire rope 17 is further wound up, the hammer drum main body 1 is pulled up. Then, after pulling up to the earth discharging position on the ground, the upper protruding portion of the suspension cylinder 2 was hooked by a support fitting generally called a crown (not shown) suspended by a wire rope different from the wire rope 17. After that, when the wire rope 17 is loosened, the main body 1 of the hammer moves downward, compresses the spring 13, and the latch 3 pivots in the direction opposite to a of FIG. 1 by its own weight balance moment. Level. When the wire rope 17 is further loosened, the spring force of the shell opening direction urging spring 9 is large, so that the latch 12 overcomes the weight balance moment of the latch 3 and rotates so that the inner end of the latch 3 moves downward. While passing through that part, the latch 3 rotates upward again after passing through that part.

Here, since the suspension supporting cylinder 2 is suspended by the crown, and accordingly the hammer main body 1 is also suspended, when the wire rope 17 is further loosened, the wire rope 10 is also loosened, The elevating frame 6 also descends. At this time, the spring force of the spring 9 for urging the shell opening direction assists the lowering of the elevating frame 6. Although the shell 20 is opened via the link 36 in this manner, since there is no conventional arm portion in the center of the inside of the shell 20, it is possible to allow the smooth to discharge the earth and sand inside the shell 20. Then, when the wire rope 17 is wound up, the latch 12 is caught by the latch 3 and the wire rope 17 returns to the state of suspending the main body 1 of the hammer as shown in FIG. 1, and the wire rope 17 is again fed out to drop the hammer rope. , The shell 20 is embedded in the ground. By repeating such operations, the ground in the casing is excavated and soil is removed.

[0020]

As described above, according to the present invention, the arm portion conventionally located at the center of the inside of the shell is removed, and the movement of the lifting frame 6 is transmitted to both ends of the arc of the shell. By attaching the link 36, the following effects can be obtained. (1) When dropping the hanger mug to make the shell hard to dig into the ground, it can be made to dig deeper into the soil than before, and further, when the shell is closed and the excavated earth and sand are scraped up, the sand is put above the shell. Therefore, the amount of uptake of excavated sediment is increased. (2) Since there is no obstruction inside the shell, soil can be discharged smoothly. (3) When the shell is pushed into the ground, both ends of the shell are connected to and supported by links, so that the shell can be prevented from being deformed even when the shell collides with a boulder, etc. It is possible to scrape earth and sand while supporting the entire shell and prevent damage such as deformation of the shell. (4) When the weight of the shell is the same as that of the conventional shell, the components corresponding to the arm portions can be utilized for strengthening the shell, and the structure of the shell can be rationalized.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a hammer mag according to the present invention.

2 (A) and 2 (B) are sectional views taken along the line EE and FF in FIG. 1, respectively, and FIG. 2 (C) is an enlarged sectional view taken along line GG of FIG. 2 (A).

FIG. 3 is a front view showing a conventional hammer grill.

FIG. 4 is a view as seen from an arrow HH of FIG.

[Explanation of symbols]

 1 Hammer grab body 2 Cylinder for suspension 3 Latch 6 Lifting frame 5,8 Sheave 9,8 Spring 10,17 Wire rope 12 Latch 16 Swivel joint 18, 34, 35 pin 20 Shell 30 Beam 32 Lower cylinder 32a Guide groove 36 Link

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[Procedure amendment]

[Submission date] April 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

Reference numeral 20 denotes a pair of shells, 32 denotes a lower cylindrical body which is a lower structural body of the Humma grab body 1, and the shell 2
Reference numeral 0 denotes a central portion of which is attached to the lower left and right portions of the lower tubular body 32 via a pin 18 so as to be openable and closable. A beam 30 is fastened to the elevating frame 6 and bolts 31, and the beam 30 has a shape in which both ends are lowered. 32
Reference numeral a is a guide groove which is vertically provided on both sides of the lower cylindrical body 32 and which guides the T-shaped portions 30a at both ends of the beam 30. 32b is a rib for reinforcing the left and right of the groove 32a, 32c is a rib for reinforcing the lower tubular body 32, 32d is a drain hole, 36
Are links connected to the T-shaped portions 30a at both ends of the beam 30 and the brackets 20a provided at both ends of the arc portion of the shell 20 by pins 34 and 35, respectively.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

When the shell 20 is closed and soil is taken in as described above, the spring 9 for urging the shell opening direction is compressed,
When the wire rope 17 is further wound up, the hammer drum main body 1 is pulled up. Then, after pulling up to the earth discharging position on the ground, the upper protruding portion of the suspension cylinder 2 was hooked by a support fitting generally called a crown (not shown) suspended by a wire rope different from the wire rope 17. After that, when the wire rope 17 is loosened, the main body 1 of the hammer moves downward, compresses the spring 13, and the latch 3 pivots in the direction opposite to a of FIG. 1 by its own weight balance moment. Level. When the wire rope 17 is further loosened, the latch 12 is urged by the spring force of the spring 9 for urging the shell opening direction.
Passes over the weight balance moment of the latch 3 while rotating so that the inner end of the latch 3 moves downward, and after passing, the latch 3 rotates upward again.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 4

[Correction method] Change

[Correction content]

4 is a H-H arrow view of FIG.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 592003474 Hokkaido Machinery Development Co., Ltd. 10-1-15 Naeho-cho, Higashi-ku, Sapporo-shi, Hokkaido (71) Applicant 593103928 Nisshin Basic Industrial Co., Ltd. 1765 Otsu-Otsu, Kochi-shi, Kochi (71) Applicant 591137363 Taiyo Foundation Co., Ltd. 3-4 Nihonbashi Kobunecho, Chuo-ku, Tokyo (71) Applicant 591135185 Foundation Industrial Co., Ltd. 5-14-1 Kamata, Ota-ku, Tokyo (71) Applicant 391039829 Toyo Techno Co., Ltd. 5-4-12 Hiroo, Shibuya-ku, Tokyo (72) Inventor Masami Nako, 225, Teraji, Kurosaki-cho, Nishikanbara-gun, Niigata Prefecture (72) Ryuichi Kanaoka 2-42, Futamatagawa, Asahi-ku, Yokohama, Kanagawa Prefecture 3 Futamatagawa Gardena No. A306 (72) Inventor Hiroshi Kusumi 40, 1-56, Sakaemachi, Ushiku City, Ibaraki Prefecture (72) Inventor Hisashi Kumagai Hokkaido Tag 7-23-1-4 Kiyota, Toyohira-ku, Yokohama (72) Inventor Mitsuaki Shimamura 3-8-1 Ino, Toride-shi, Ibaraki (72) Inventor Sumio Chikazawa 984-2, Otsuko, Kochi-shi, Kochi (72) Invention Hidenori Fujiki 185-15, Kinmeicho, Soka-shi, Saitama Prefecture (72) Inventor Toshio Yagi 4-25-25-110 Kisiya, Tsurumi-ku, Yokohama-shi, Kanagawa (72) Seiya Yamaguchi 1 Kamikimoto-cho, Miyamae-ku, Kawasaki-shi, Kanagawa 9th-7th Mitsuki Green Heights C-203

Claims (1)

[Claims] 1. Hammer grabs suspended by one wire rope are dropped, and a pair of shells having a sharp lower tip attached to the lower end of the main body of the hammer are inserted into the ground by the falling energy, and the wire ropes In a humbug club for excavating and discharging earth and sand by opening and closing the shell as the wire rope moves up and down, an elevating frame that moves up and down according to the movement of the wire rope is provided. -A hammer mug for cast-in-place pile construction, wherein a plurality of links for transmitting the movement of the shell to the pair of shells are provided by connecting one end of each link to both ends of each shell.