JPH05248089A - Jack for construction work - Google Patents

Abstract

PURPOSE:To improve the safety of the building construction work and working efficiency by carrying out the extension/contraction of a hydraulic cylinder and the jointing of strats alternately, carrying out jack-up in the state where the upper part of a building is assembled, and executing the construction of the lower part of the building. CONSTITUTION:A plurality of jacks are arranged, and a piston rod is extended by supplying oil into the hydraulic cylinder 1 of each jack. Then, the hook of a ratchet 9 pushes up a strat 7, and after an auxiliary beam 23 contacts a beam 20, the beam 20 is lifted up, together with the upper part of a building. Then, the piston rod is extended to the full, and an another strat 7 is interposed between the rising strat 7 and a base seat 6. In this case, the tapered part 7a at the top edge is inserted into a receptacle 7b, and the base edge is placed on the base seat 6. Then, each hydraulic cylinder 1 is contraction-driven, and the load of the building is applied to the strat 7, and the hook of the ratchet 9 is engaged with the flange 8 of the lower side strat 7. In succession, the hydraulic cylinder 1 is extended to lift up the beam 20, and the next strat is joined between the lower side strat 7 and the base seat 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack used in a construction method in which an upper part of a building is constructed on the ground and then lifted in the air to construct a lower part of the building.

[0002]

2. Description of the Related Art As a construction method of a prefabricated house, for example, a construction method is known in which materials are lifted and assembled by a truck crane. In addition, truck cranes may not be available when working in remote areas of mountains, or where the site or approach road is narrow.In that case, generally build a scaffold to build the building from below. The conventional construction method is adopted.

[0003]

However, such a conventional method has the following problems.
There is a problem that the number of man-hours is large and a great deal of labor is required, and further, since there is a lot of work at a high place on the scaffold, the risk of construction tends to be high.

In this regard, the present applicant has filed Japanese Patent Application No. 2-247.
No. 921 proposes a small and lightweight jack that lifts the upper part of a building assembled on the ground. By constructing the lower part of the building below the upper part of the building lifted by using this jack, it becomes possible to construct the building without building scaffolding even in the remote areas of mountains or narrow places where truck cranes cannot be used.

It is an object of the present invention to provide a jack that is easier to use and is applicable to such a jack-up construction method.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a vertically extending telescopic cylinder that integrally telescopes, a connecting plate that connects the upper ends of these telescopic cylinders, and a joint that is arranged in parallel with the telescopic cylinder. Possible struts, flanges formed on each strut, and members provided on the connecting plate to engage and support the flanges upward.

[0007]

When the tip of the strut supports the upper part of the building and the flange of this strut is supported by the connecting plate by the support member to extend the telescopic cylinder, the strut rises together with the upper part of the building.

When another strut is added below the strut that has risen to a predetermined position and the telescopic cylinder is contracted, the upper part of the building is supported on the ground by the strut. When the support member supports the lower strut flange to extend the telescopic cylinder again, the building further rises.

By repeating this work, the building rises to the required height.

Since the struts do not project into the building,
Jack up work can be done with the upper part of the building completely assembled.

[0011]

1 to 6 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 is two hydraulic cylinders that are erected in parallel. As shown in FIG. 2, the hydraulic cylinder 1 is composed of a cylinder tube 2 and a piston rod 3 protruding upward from the cylinder tube 2, and by supplying high pressure hydraulic oil to the cylinder tube 2 via a hydraulic pipe (not shown), The piston rod 3 is expanded and contracted synchronously.

The upper ends of the piston rods 3 are connected by an upper connecting plate 4, and the lower ends of the cylinder tubes 2 are connected by a lower connecting plate 5.

A pedestal 6 is fixed to the lower connecting plate 5 between the cylinder tubes 2. The pedestal 6 supports struts 7 arranged in parallel with the hydraulic cylinder 1.
Further, a hole through which the strut 7 penetrates is formed in the center of the upper connecting plate 4 above the pedestal 6.

The strut 7 is a pipe-shaped member that is slightly shorter than the total stroke distance of the piston rod 3. As shown in FIG. 4, a taper portion 7a having a gradually reduced diameter is provided at the tip and a taper portion at the base end. There is provided a socket 7b having a shape and dimension that fits around the outer periphery of 7a. A flange 8 is formed at the base end of the tapered portion 7a. The upper connecting plate 4
The hole is formed so that the flange 8 can pass through.
A semicircular positioning plate 6a for positioning the socket 7b of the strut 7 is fixed to the pedestal 6.

The upper connecting plate 4 connecting the hydraulic cylinders 7 is provided with a ratchet 9 as a member for engaging and supporting the flange 8. The ratchet 9 is a case 13 in which a claw 10 protruding laterally to the lower side of the flange 8 and a spring 11 biasing the claw 10 in the projecting direction are housed in a case 13.
The base end 10a of the claw 10 penetrates the case 13 and is hinged to the lever 12 outside the case 13 as shown in FIG. The lever 12 is not directly locked to the case 13, but is held in contact with the case 13 by the spring 11 via the base end 10a of the pawl 10, and is rotated to operate the base end 10a.
Is pulled out from the case 13 against the spring 11, and the claw 10 is retracted from below the flange 8.

On the upper connecting plate 4, ratchets 9 having such a structure are provided at two opposite positions, and the piston rod 3 of the hydraulic cylinder 1 is connected to the upper connecting plate 4 via the case 13 of these ratchets 9. Join.

Next, the operation will be described.

In FIG. 1, a beam 20 supports the upper part of the building and is supported by a foundation 21 of the building through a support pipe 22. The upper part of the building is assembled on this beam 20. When the top of the building is assembled, use the jack to lift the top of the building. In that case, jack up at least four corners of the top of the building.

The jack has two beams 20 as shown in FIG.
Place on the ground below the inside of the joint. In this state, the hydraulic cylinder 1 contracts and the struts 7 are supported by the pedestal 6.

After arranging the jacks at the predetermined supporting positions, the auxiliary beams 23 are placed on the struts 7, high pressure hydraulic oil is supplied from the hydraulic device to the hydraulic cylinders 1 of all the jacks, and the piston rods 3 are synchronized. Drive extension.

The auxiliary beam 23 is arranged at an angle of about 45 degrees with respect to both beams 20 so as to be able to support both of the two beams 20 that are joined at a right angle in the corner of the building. 7 supports the central portion of the auxiliary beam 23.

As the piston rod 3 extends, the claws 10 of the ratchet 9 move through the flanges 8 to the struts 7.
And push the auxiliary beam 23 against the beam 20,
Lift 0 with the top of the building.

When the piston rod 3 is fully extended in this manner, another strut 7 is inserted between the raised strut 7 and the pedestal 6 as shown in FIG.

Since the strut 7 is slightly shorter than the total stroke distance of the piston rod 3, the tapered portion 7a at the tip is first inserted into the socket 7b of the strut 7 supported above, and then the base end is placed on the pedestal 6. This task is easy to do.

Next, the hydraulic cylinders 1 are simultaneously driven to contract. Along with this, the load of the upper part of the building supported by the hydraulic cylinder 1 is applied to the struts 7. The struts 7 connected to the tapered portion 7a through the socket 7b of the same type are further firmly connected to each other by the load acting on the building downwards.

Immediately before the piston rod 3 reaches the most contracted position shown in FIG. 3, the upper connecting plate 4 is placed on the lower strut 7.
Over the flange 8 fixed to the taper portion 7 of the socket 7, but at this time, the pawl 10 of the ratchet 9 descends along the taper surface of the outer periphery of the socket 7b to retreat against the spring 11, and when the flange 8 is crossed over. As shown in FIG. 4, advance to the forward position. Therefore, it is not necessary to operate the lever 12 when the hydraulic cylinder 1 is driven to contract.

In this way, when the hydraulic cylinder 1 is contracted to the position shown in FIG. 3 and the pawl 10 of the ratchet 9 engages with the flange 8 of the lower strut 7, the hydraulic cylinder 1 is restarted.
Is driven to extend and the beam 20 is lifted. This allows the beam 2
Since 0 further rises by an amount corresponding to the stroke distance of the hydraulic cylinder 1, a third strut 7 is added between the raised lower strut 7 and the pedestal 6.

By repeating the above work until a predetermined number of struts 7 are added, the upper part of the building rises to a predetermined height. In this state, the lower part of the building is constructed below the beam 20.

By the way, a lateral load may act on the upper part of the building thus jacked up due to an earthquake or wind, but since this jack basically has a structure for supporting only a downward load, It is necessary to put a rope between the upper part of the building and the ground for the lateral load.

However, as shown in FIG. 6, the seat plate 14 having a large area is laid on the ground, and the lower connecting plate 5 of the jack is installed.
Is fixed to the seat plate 14 by the clamp 15, while the taper portion 7a of the strut 7 at the upper portion is locked to the auxiliary beam 23 through the socket 16 and the vise 17, and the auxiliary beam 23 is fixed by another clamp 18. When the strut 7 is locked to the strut 20, the strut 7 structurally serves as an upper fixed column, and the lower end is also stably supported by the seat plate 14, so that the lateral rigidity and buckling strength of the jack are greatly increased. Therefore, it is possible to omit the restraint rope by such a treatment.

Now, when the construction of the lower part of the building makes it unnecessary to support the upper part of the building, the jack is removed.

This work is carried out by repeating the work of removing the lower strut 7 while the upper strut 7 is supported by the hydraulic cylinder 1 as opposed to the case of jacking up. In this case, since the strut 7 is connected by the taper portion 7a and the socket 7b, the beam 20 is supported by the hydraulic cylinder 1, and if the load on the lower strut 7 is removed, the lower strut 7 is replaced by the upper strut 7 thereof. Can be easily separated from.

In this way, first, the lowermost strut 7 is removed, the hydraulic cylinder 1 is contracted, and the second lower strut 7 is brought into contact with the pedestal 6, and the hydraulic cylinder 1
To engage the ratchet 9 with the flange 8 of the strut 7 above it. When the hydraulic cylinder 1 is extended, the ratchet 9 needs to pass through the outside of the flange 8 of the strut 7 that abuts on the pedestal 6. At that time, the lever 12 is rotated about 90 degrees as shown in FIG. 4 to temporarily retract the pawl 10 of the ratchet 9.

After the pawl 10 has passed through the flange 8, the lever 12 is rotated to the original position, and the hydraulic cylinder 1 is extended while the pawl 10 is advanced to support the upper strut 7.

Thus, while the hydraulic cylinder 1 is expanding and contracting, the struts 7 are sequentially removed from the lower stage to contract the jack to the initial state and remove it.

In this jack, the auxiliary beam 23
Since there is no member protruding above, the jack-up work can be performed without any interference with the structural members on the upper part of the building. Therefore, the upper part of the building may be jacked up in a completely assembled state on the ground, and there is no need to reconstruct a part of the floor or roof of the upper part of the building after removing the jack.

[0038]

As described above, the jack of the present invention lifts the upper part of the building to an arbitrary height by alternately extending and contracting the hydraulic cylinder and adding struts.
It is possible to construct a building without performing work in high places, and since there is no member projecting inside the upper part of the building, the upper part of the building can be lifted in a completely assembled state.
Therefore, there is an effect that the safety of construction work and work efficiency are significantly improved.

Further, because of its small size and light weight, it can be easily applied to the construction work in a narrow place where it is difficult for a truck crane to enter or in a remote mountain area.

[Brief description of drawings]

FIG. 1 is a side view of a jack, an upper beam of a building, and a foundation showing an embodiment of the present invention.

FIG. 2 is a side view of a jack and a beam showing a strut addition operation.

FIG. 3 is a side view of the jack and the beam showing the contracting operation of the hydraulic cylinder.

FIG. 4 is an enlarged vertical sectional view of a strut connecting portion and a ratchet.

FIG. 5 is an enlarged rear view of the ratchet showing the combined state of the lever and the claw.

FIG. 6 is a side view of a jack and beam showing another embodiment for increasing lateral stability.

[Explanation of symbols]

 1 Hydraulic cylinder 7 Strut 8 Flange 9 Ratchet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tsunehisa Matsuda 2-11-1, Shibadaimon, Minato-ku, Tokyo Fujiville Nippon Mining Machinery Co., Ltd. (72) Inventor Tadao Ishikawa 2-chome, Hamamatsucho, Minato-ku, Tokyo No. 1 World Trade Center Building Kayaba Industry Co., Ltd.

Claims (1)

[Claims] 1. Stretching cylinders arranged in parallel vertically extending and contracting integrally, a connecting plate for connecting the upper ends of these stretching cylinders, a strut capable of being added in parallel with the stretching cylinder, and strut for each strut. A jack for construction work, comprising a formed flange and a member provided on the connecting plate to engage and support the flange upward.