JP3072176B2 - Jack for construction work - Google Patents

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 method of constructing a prefabricated house or the like, there is known a method of assembling while lifting materials with a truck crane, for example. In addition, truck crane may not be used when performing construction in a remote mountainous area or when the construction site or approach road is narrow, in which case, generally build a scaffold and build the building from below Conventional construction methods are employed.

[0003]

However, such conventional construction methods include:
There is a problem that a large number of man-hours are required and a large amount of labor is required, and there is a tendency that the risk of construction is increased due to an increase in height work on a scaffold.

[0004] In this regard, the present applicant has filed Japanese Patent Application No. 2-247.
No. 921 proposes a small and lightweight jack for lifting the upper part of a building assembled on the ground. If the lower part of the building is constructed under the upper part of the building lifted by using the jack, it is possible to construct the building without assembling a scaffold even in a remote mountainous area or a narrow place where a truck crane cannot be used.

[0005] It is an object of the present invention to provide a further easy-to-use jack applicable to such a jack-up method.

[0006]

The present invention, there is provided a means for achieving] is of upright on the ground
A telescopic cylinder which expands and contracts in the vertical direction is a telescopic cylinder and topped possible strut erected on the ground in parallel, the flange formed on each strut is attached to the telescopic cylinder, upwardly engage support flanges A support member and a jack arranged under the upper part of the building being assembled.
In g, the strut supporting the upper part of the building at the tip is extended by the telescopic cylinder and pushed up by the support member,
After adding another strut under it, disengage the support member and flange and transfer the load of the building to the strut,
The building is lifted by repeating the operation of contracting the telescopic cylinder, engaging the support member with the flange of another strut and pushing up, and after construction, lower the strut of the lower strut while supporting the flange of the upper strut with the support member. The strut was disassembled by repeating the removal operation while extending and retracting the telescopic cylinder. In addition, two telescopic cylinders were arranged in parallel, and the upper ends of these telescopic cylinders were connected by a connecting plate so as to expand and contract integrally, and the struts were disposed between the telescopic cylinders. Also, a flange is formed at the tip of the strut, and a tapered part is provided on the flange,
A socket fitted to the tapered portion was provided at the base end.

[0007]

When the upper part of the building is supported by the end of the strut and the flange of the strut is supported on 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 to the lower side of the strut which has been raised to a predetermined position and the telescopic cylinder is contracted, the upper part of the building is supported on the ground by the strut. The building is raised further when the telescopic cylinder is extended again by supporting the flange of the lower strut with the support member.

By repeating this operation, the building is raised to a required height.

[0010] Since the strut does not protrude into the building,
Jack-up work can be performed with the upper part of the building completely assembled. After installation, the upper strut hula
With the flange supported by the support member, remove the lower strut
Repeat the work while expanding and contracting the telescopic cylinder
The struts can be disassembled.

[0011]

1 to 6 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes two hydraulic cylinders that stand in parallel. As shown in FIG. 2, the hydraulic cylinder 1 is composed of a cylinder tube 2 and a piston rod 3 projecting upward from the cylinder tube 2. By supplying high-pressure hydraulic oil to the cylinder tube 2 via a hydraulic pipe (not shown), two cylinders are provided. The piston rod 3 is extended 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 a strut 7 arranged in parallel with the hydraulic cylinder 1.
At the center of the upper connecting plate 4 above the pedestal 6, a hole is formed to allow the strut 7 to pass therethrough.

The strut 7 is a pipe-like member slightly shorter than the entire stroke distance of the piston rod 3. As shown in FIG. 4, a tapered portion 7a whose diameter is gradually reduced is provided at the distal end, and a tapered portion is provided at the proximal end. A socket 7b having a shape and a size fitted to the outer periphery of 7a is provided. A flange 8 is formed at the base end of the tapered portion 7a. The upper connecting plate 4
Is formed in such a size 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 base 6.

The upper connecting plate 4 for connecting the hydraulic cylinder 7 is provided with a ratchet 9 as a member for engaging and supporting the flange 8. The ratchet 9 has a claw 10 projecting downward from the side of the flange 8 and a spring 11 for urging the claw 10 in the protruding direction.
The proximal 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 10 a of the claw 10.
Is pulled out of the case 13 against the spring 11, and the claw 10 is retracted from below the flange 8.

The upper connecting plate 4 is provided with two ratchets 9 having the above-described structure, and the piston rod 3 of the hydraulic cylinder 1 is connected to the upper connecting plate 4 via the case 13 of the ratchet 9. Join.

Next, the operation will be described.

In FIG. 1, reference numeral 20 denotes a beam for supporting the upper part of the building, which is supported on a foundation 21 of the building via a support pipe 22. The upper part of the building is assembled on this beam 20. When the upper part of the building has been assembled, use the jack to lift the upper part of the building. In this case, at least four corners of the upper part of the building are supported by jacks.

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

After arranging each jack at a predetermined support position, the auxiliary beam 23 is placed on the strut 7, and high-pressure hydraulic oil is supplied from a hydraulic device to the hydraulic cylinders 1 of all jacks, and the piston rods 3 are synchronized. Is extended.

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

As the piston rod 3 extends, the pawl 10 of the ratchet 9 is moved through the flange 8 into the strut 7
After the auxiliary beam 23 is brought into contact with the beam 20,
Lift 0 with the top of the building.

When the piston rod 3 is fully extended in this way, 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 entire stroke distance of the piston rod 3, the tapered portion 7a at the distal end 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 can be done easily.

Next, the hydraulic cylinders 1 are simultaneously driven to contract. Accordingly, the load on the upper part of the building supported by the hydraulic cylinder 1 is applied to the strut 7. The strut 7 connected via the socket 7b of the same type as the tapered portion 7a is further firmly connected by the load acting on the upper part of the building in the downward direction.

Immediately before the piston rod 3 reaches the most contracted position shown in FIG.
When the pawl 10 of the ratchet 9 descends along the tapered surface of the outer periphery of the socket 7b, it retreats against the spring 11 and moves over the flange 8 at this time. It advances to the forward position as shown in FIG. 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 contracts 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 driven to elevate the beam 20. Thereby, the beam 2
0 further rises by an amount equivalent to the stroke distance of the hydraulic cylinder 1, so the third strut 7 is added between the raised lower strut 7 and the pedestal 6.

By repeating the above operation until a predetermined number of struts 7 are added, the upper part of the building is raised 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 be applied to the upper part of the building which has been jacked up due to an earthquake, wind, or the like. However, since this jack basically has a structure for supporting only a downward load, these jacks are not used. It is necessary to set up a stay rope between the upper part of the building and the ground against the lateral load of the building.

However, as shown in FIG. 6, a large seat plate 14 is laid on the ground, and the lower connecting plate 5 of the jack is provided.
Is fixed to the seat plate 14 with the clamp 15, the tapered portion 7 a of the upper strut 7 is locked to the auxiliary beam 23 via the socket 16 and the vise 17, and the auxiliary beam 23 is When the strut 7 is locked to the strut 7, the strut 7 is structurally fixed at the upper end and the lower end is 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 stay line by such a treatment.

When the support at the upper part of the building becomes unnecessary due to the construction at the lower part of the building, the jack is removed.

This operation is performed by repeating the operation of removing the lower strut 7 while the upper strut 7 is supported by the hydraulic cylinder 1 contrary to the jack-up operation. In this case, since the struts 7 are connected to each other by the tapered portion 7a and the socket 7b, the beam 20 is supported by the hydraulic cylinder 1, and when the load on the lower struts 7 is removed, the lower struts 7 are moved to the upper struts 7 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.
To engage the ratchet 9 with the flange 8 of the strut 7 thereon. 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 the pedestal 6. At this time, the pawl 10 of the ratchet 9 is temporarily retracted by rotating the lever 12 about 90 degrees as shown in FIG.

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 with the pawl 10 advanced, thereby supporting the upper strut 7.

In this way, while the hydraulic cylinder 1 is extended and contracted, the struts 7 are sequentially removed from the lower stage, so that the jack is contracted and removed to the initial state.

In this jack, the auxiliary beam 23
There is no member that protrudes upward, and the jack-up operation can be performed without any interference with components at the top of the building. Therefore, the upper part of the building may be jacked up in a state of being completely assembled on the ground, and there is no need to reconstruct a part of the floor or the roof at the upper part of the building after removing the jack.

[0038]

As described above, the jack of the present invention raises the upper part of the building to an arbitrary height by alternately performing expansion and contraction of the hydraulic cylinder and extension of the strut.
The building can be constructed without working at heights, and since there are no members protruding inside the upper part of the building, the upper part of the building can be lifted in a completely assembled state.
For this reason, there is an effect of greatly improving the safety and work efficiency of the construction work.

Further , a strap is provided between the two telescopic cylinders.
The struts are easy to support the struts. Also, strike
Rats are fitted with a taper at the tip and a socket at the base
The struts are easy to attach and detach.
You. In addition, since it is small and lightweight, it can be easily applied to construction work in a narrow place where a truck crane is difficult to enter or in a mountainous remote place.

[Brief description of the drawings]

FIG. 1 is a side view of a jack, a beam at the top 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 adding operation.

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

FIG. 4 is an enlarged longitudinal sectional view of a strut connection portion and a ratchet.

FIG. 5 is an enlarged rear view of the ratchet showing a coupling 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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsunehisa Matsuda 2-1-1, Shiba-Daimon, Minato-ku, Tokyo Fuji Building Nippon Mining Machinery Co., Ltd. (72) Inventor Tadao Ishikawa 2--4 Hamamatsucho, Minato-ku, Tokyo No. 1 World Trade Center Building Kayaba Industry Co., Ltd. (56) References JP-A-59-177480 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 21/16

Claims (3)

(57) [Claims] 1. A telescopic cylinder that stands on the ground and expands and contracts in the vertical direction, a strut that can be extended and erected on the ground in parallel with the telescopic cylinder, a flange formed on each strut, and a telescopic cylinder. , and a support member for upward engage support flanges, building during assembly
In the jack located below the upper part, the strut supporting the upper part of the building at the tip is extended by the telescopic cylinder and pushed up by the support member, and another strut is added below it, and then the engagement between the support member and the flange is performed. Remove and transfer the load of the building to the strut, contract the telescopic cylinder, engage the support member with the flange of another strut and push it up repeatedly to lift the building and support the upper strut flange after construction A jack for building construction, characterized in that a strut is disassembled by repeatedly performing a work of removing a lower strut while being supported by members while expanding and contracting an extendable cylinder. 2. Two telescopic cylinders are arranged in parallel.
The upper ends of these telescopic cylinders are connected with a connecting plate to expand and contract integrally.
And place the struts between the telescopic cylinders
The jaw for construction work according to claim 1, wherein
Stick. 3. A flange is formed at the tip of the strut,
The flange is provided with a tapered portion, and the tapered portion is provided at the base end.
2. The socket according to claim 1, wherein a socket to be fitted is provided.
A jack for construction work according to claim 2.