JPH06219691A - Jack - Google Patents

Abstract

PURPOSE:To provide a jack which can favorably be used for preload and also as an ordinary jack to ensure quick and simple works, wherein the structure is simple, the cost suppressed, and the preload in the timbering work can certainly be borne easily. CONSTITUTION:A jack is formed from a screw type jack body 10 provided with length adjustability with forward feeding of a male thread member and a hydraulic type jack body 20 provided with length adjustability by means of increase/decrease of the oil pressure, wherein the two jack bodies 10, 20 are installed in gang-arrangement in the axial direction. The screw type jack body is first subjected to length adjustment and interposed in the gap between cut beams, and then the hydraulic jack body is pressuried and elongated, and an initial load is applied on the cut beams so that a preload is applied to the timbering work, and thereby a preload method is established where movement of the timbering is hindered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack, and more particularly, to a cliff wall composed of a cross pile and a main pile for receiving earth pressure of excavated ground, and an uprising and cutting member for supporting back earth pressure applied to the wall. TECHNICAL FIELD The present invention relates to a jack suitable for use as a preloading jack for supporting a preload in a civil engineering construction mountain truss structure including a support structure composed of a beam and a beam, which is interposed between the girders constituting the support structure.

[0002]

2. Description of the Related Art Conventionally, as one of the construction methods for constructing underground chambers and underground malls, cliff work has been carried out to prevent collapse of the excavated ground. Along with this, there is a tendency that the basement floor is deeply multi-layered, and along with this, the scale of the mountain girder structure used for mountain girder construction is also increasing. There are roughly two types of mountain piers, concrete gravel framing and yaita yama framing. The former is more expensive, and the latter is widely used for economic reasons. (S.M.
W. Construction method) parent pile side sheet pile structure is adopted in many sites.

This S. M. W. The main pile lateral sheet pile structure of the construction method is composed of a cliff wall which supports earth pressure of the surrounding ground at the time of excavation and a support work which supports the cliff wall. The cliff wall is composed of a main pile and a horizontal sheet pile, receives earth pressure of the excavated ground, and is supported by the uplift of the support work. Further, the support work is composed of a bulge and a girder, and supports the back surface earth pressure applied to the retaining wall.

At this time, as the construction progresses, the earth pressure acting on the surrounding ground causes movement of the cliff wall, which is prevented by being supported by the support work.

For this reason, a jack is interposed between the beams that constitute the support work to adjust the length of the support work and prevent the movement of the cliff wall.

By the way, as the jack interposed between the beams, a screw type jack (so-called giraffe jack) in which a male screw and a female screw are screwed together and the length of which is expanded and contracted by the screwing of both is used. However, this screw-type jack is convenient because it has a simple structure for adjusting the length of the girder at the time of assembling the support work, but it is convenient once the construction progresses and the earth pressure of the surrounding ground acts. When this happens, the size of the back surface earth pressure applied to the cliff wall becomes much larger than the operating pressure (50t) of the screw type jack, so the length adjustment becomes almost impossible, and it is only a mere heavy rod. There was a problem that it did not exist.

On the other hand, the cutting beam itself has an elastic compressive strain,
In addition to contraction due to creep strain, familiarity of joints, etc., the cliff walls loosen, and movements that cannot be avoided for supporting work occur. There was a problem that it was necessary to prevent

Therefore, as a measure against these conventional problems, a hydraulic jack whose pressure is much higher than the operating pressure of the above-mentioned screw type jack (300 t) and whose length can be expanded and contracted by pressurizing and depressurizing the hydraulic pressure, It has come to be used to support the above-mentioned support work. At this time, a preload construction method has been performed in which the hydraulic jack is interposed between the beams and a pressure is applied to the beams in advance by the hydraulic jack to prevent the support work from moving.

However, the hydraulic jack used in the preloading method has an advantage that the construction is easy because the working pressure is large, while the product price is high and the amount of oil used is also large. There is a problem that the running cost is high due to the large size, fine adjustment of the length at the time of setting is complicated, and the construction takes time.

[0010]

In view of the above problems of the prior art, the main object of the present invention is to provide a jack having both the advantages of the screw type jack and the advantages of the hydraulic type jack. It is an object of the present invention to provide a jack which has a simple structure and is capable of easily and surely constructing a civil engineering construction mountain mooring structure and significantly reducing the product cost and the running cost.

[0011]

SUMMARY OF THE INVENTION According to the present invention, such an object is to provide a screw type jack body in which a male screw and a female screw are screwed together, and the length of which is expanded and contracted by the screwing of the male screw, and hydraulic pressure. With a hydraulic jack body whose length expands and contracts due to pressure increase and decrease,
This is achieved by providing a jack characterized by being connected in the axial direction.

[0012]

As described above, according to the present invention, the jack in which the screw type jack body and the hydraulic type jack body are axially connected to each other is provided. When it is used for a frame, it can be easily and surely constructed by interposing it between the beams that constitute the support work.

That is, by interposing the jack of the present invention between the beams constituting the support work, and applying the hydraulic pressure to the hydraulic jack body in advance to exert a pressure on the beams, the preloading method is performed, whereby the beams are cut. It absorbs elastic compression strain, creep strain, shrinkage caused by familiarity of the joint part, and looseness generated at the retaining wall.

At this time, first, the screw type jack body is made to have a length close to the width of the gap between the beams. Next, the screw type jack is interposed between the beams, and a male screw is screwed to apply pressure to the beams. Next, pressurize the hydraulic pressure of the hydraulic jack body to extend the length of the hydraulic jack body,
By applying an initial load to the beam, a preload is applied to the support work and a preloading method is performed to prevent the support work from moving.

As a result, it becomes possible to support the back surface earth pressure applied to the retaining wall and prevent the displacements of the beams and retaining walls, thereby avoiding the movement of the supporting work.

Further, since the main piles and the side sheet piles constituting the mountain retaining wall, and the uprising and the cutting beam constituting the supporting structure are in close contact with each other, there is a dimensional error between the retaining wall and the supporting structure. Even if the error is absorbed, it becomes possible to construct the civil engineering construction mountain structure.

Therefore, with this jack, it is possible to reliably support the back surface earth pressure acting on the cliff wall by supporting work, and prevent accidents such as ground subsidence and sediment collapse. .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention. A jack 1 is a screw type jack body 10 in which a male screw and a female screw are screwed together and the length of which is expanded and contracted by the screwing of the male screw.
And a hydraulic jack body 20 that expands and contracts in length by increasing and decreasing the pressure of the hydraulic pressure, and the screw type jack body 10 and the hydraulic jack body 20 are connected in the axial direction.

The screw type jack body 10 has a male thread body 30 having a male thread, a female thread to be screwed to the male thread, and a female thread body to be screwed and coupled to the male thread body so as to face each other. And 40.

Further, the male screw body 30 includes a handle 33 in which four grips 32 are radially provided on a solid cylindrical base portion 31, and shafts 35, 35 connected to both sides of the base portion 31. A male screw 34 is screwed on the outer periphery of the shaft 35.

Further, the female screw body 40 has a tubular body 42 having an internal thread 41 screwed into its inner diameter portion, a rectangular plate-shaped end plate 43 joined to the end face of the tubular body 42, and the end plate 43. And a support portion 45 composed of four trapezoidal plate-shaped rib plates 44 connected to the cylindrical body 42.

In the screw type jack body 10, the left and right male threads 34 of the male thread body 30 are screwed with the female threads 41 of the two female thread bodies 40 in opposition to each other. It can be formed by threadingly disposing female screw bodies 40 on the left and right, and by rotating the handle 33 and screwing the screw body 30, the length of the screw type jack body 10 can be expanded and contracted. it can.

On the other hand, the hydraulic jack body 20 includes a hydraulic body 50 on which hydraulic pressure acts, a support body 60 connected to the hydraulic body 50, and a safety stopper 70 screwed to the hydraulic body 50.
Consists of.

The hydraulic body 50 has a hydraulic cylinder 52 having a cylinder hole 51 therein, a ram piston 53 slidably fitted in the hydraulic cylinder 52, and an opening end of the cylinder hole 51. The ram piston retainer 54 screwed to the enlarged diameter hole portion 51a formed by the above, and the external thread 54a screwed to the outer periphery of the screw 51b is screwed together, and the rectangle connected to the solid end portion of the hydraulic cylinder 52. An oil seal 56, which includes a plate-shaped end plate 55 and is provided on the outer periphery of the end of the ram piston 53, is fitted with an oil seal 56 for preventing oil leakage, and the ram piston 53 and the cylinder hole 51 are connected to each other. Oil 57 is interposed between the
A conducting passage 52a communicating with the cylinder hole 51 is opened in the hydraulic cylinder 52, and a connecting nut 58 is screwed into an end portion of the conducting passage 52a. A hydraulic hose 59, which is connected to a hydraulic source (not shown), is connected to the connecting nut 58, and hydraulic pressure from the hydraulic source acts on the internal oil 57.

Further, in the support 60, the connecting hole 61 is fitted in the connecting portion 53b formed by reducing the diameter of the end of the ram piston 53, and the pressing ball 62 and the stopper screw 63 are formed.
Attachment 64 connected via the end plate 65, a rectangular plate-shaped end plate 65 connected to a solid end of the attachment 64, and four trapezoidal plate-shaped ribs connected to the end plate 65 and the attachment 64. Plate 66
The presser balls 62 are fitted in the four recesses 53c radially provided on the outer periphery of the coupling portion 53b, and the four female screws 6 radially provided on the attachment 64 are formed.
It is integrally formed by screwing a stopper screw 63 to 4a.

Further, the safety stopper 70 is composed of four solid grips 72 radially projecting from a solid cylinder 71 and screws 73 screwed into the inner diameter of the cylinder 71.

Then, the safety screw 70 is screwed to the hydraulic body 50 by screwing the female screw 73 to the male screw 53d screwed on the outer periphery of the ram piston 53.
Further, the coupling hole 61 is fitted to the coupling portion 53b of the ram piston 53, the pressing ball 62 is fitted to the recess 53c, and the stopper screw 63 screwed to the female screw 64a is screwed to push the pressing ball 62. The ram piston 53 and the attachment 64 are integrally connected by pressing to connect the support body 60 to the hydraulic body 50.

In this way, the hydraulic body 5 on which the hydraulic pressure acts
0, a support body 60 connected to the hydraulic body 50, and a safety stopper 70 screwed to the hydraulic body 50 are integrally formed.

The hydraulic jack body 20 is axially connected to the screw type jack body 10 by joining the end plate 55 to the end plate 43 of the screw type jack body 10 by a joining means such as welding. As a result, the jack 1 is formed.

The jack 1 thus formed is
The length of the screw type jack body 10 is expanded / contracted by screwing the male screw, and the length of the hydraulic type jack body 20 is expanded / contracted by pressurizing / depressurizing the hydraulic jack body 20 to apply an initial load to the beam K, thereby supporting the work. It is possible to add a preload to the preloading method to prevent the movement of the support work.

In this way, by carrying out the preloading method with the jack 1, the back surface earth pressure applied to the mountain retaining wall composed of the main pile and the side sheet pile is supported, and the displacement caused by the cutting beam K and the uprising is prevented. Block and avoid the movements that occur during the shoring.

At this time, the jack of the present invention is interposed between the cutting beams K forming the supporting work, and the preloading method is performed by applying a hydraulic pressure to the hydraulic jack body in advance to exert a pressure on the cutting beam K. By doing so, the elastic compressive strain, the creep strain, the shrinkage caused by the familiarity of the joint portion, and the looseness caused in the retaining wall are absorbed.

Then, the main piles and the side sheet piles constituting the mountain stop wall,
Also, since the uprising and the girder K that constitute the support work are in close contact with each other, even if there are dimensional errors in the retaining wall and the support work, the errors are absorbed to perform the civil construction mountain stop frame structure. Will be able to.

Therefore, with this jack, it is possible to reliably support the back surface earth pressure acting on the cliff wall by supporting work, and prevent accidents such as ground subsidence and sediment collapse. .

Next, the usage will be described.

According to the present invention, the screw type jack body and the hydraulic type jack body are axially connected to each other. Therefore, the jack type structure is used for the civil engineering construction mountain structure which is composed of the mountain retaining wall and the supporting structure. In this case, the preloading method can be easily and surely constructed by interposing between the beams G and K which constitute the supporting work.

That is, first, by turning the handle 32 of the screw-type jack body 10 by hand to rotate the handle 33 and screwing the screw 34 with respect to the female screw 41, the length of the screw-type jack body 10 is increased. Are expanded and contracted to be approximately the same as the gap between the beams K.

Next, the end plate 43 and the end plate 65 are respectively brought into contact with the end faces of the two cut beams K, K to interpose the screw type jack body 10 between the cut beams K, and
The male screw 34 is screwed to close the gap between the cut beams K and K, and pressure is applied to the cut beams K and K.

Subsequently, the hydraulic pressure of the hydraulic jack body 20 is pressurized to cause the ram piston 53 to project and move from the hydraulic cylinder 52, the length of the hydraulic jack body 20 is extended, and the beam beams K, K are initialized. Apply a load. At this time, the handle 72 is turned to cause the female screw 73 to be advanced, and the safety stopper 7
0 is brought into contact with the end surface of the hydraulic cylinder 52 to prevent an unexpected situation and maintain the original position.

As a result, a preload is applied to the supporting work consisting of the sill beams K and the uprising, and the preloading method is carried out to prevent the supporting work from moving.

In this way, by carrying out the preloading method with the jack 1, the back surface earth pressure applied to the mountain retaining wall composed of the main pile and the side sheet pile is supported, and the displacement caused by the cut beam K and the uprising is prevented. Block and avoid the movements that occur during the shoring.

At this time, the jack of the present invention is interposed between the cut beams K, K constituting the support work, and the hydraulic jack body is preliminarily acted with hydraulic pressure to exert a pressure on the cut beams K, K.
By performing the preloading method, the elastic compressive strain, creep strain, shrinkage due to the familiarity of the joint portion, and the looseness caused at the retaining wall are absorbed.

Then, the main piles and the side sheet piles constituting the mountain stop wall,
Also, since the uprising and the girder K that constitute the support work are in close contact with each other, even if there are dimensional errors in the retaining wall and the support work, the errors are absorbed to perform the civil construction mountain stop frame structure. Will be able to.

Therefore, with this jack, it is possible to reliably support the back surface earth pressure acting on the cliff wall by supporting work, and prevent accidents such as ground subsidence and sediment collapse. .

In the present invention, the shapes of the male screw body 30 and the female screw body 40 are not limited to those in the above embodiment, and the length thereof can be expanded and contracted by screwing the screw, and the beam girder K is used. The shape is not limited as long as the gap between them can be closed together with the hydraulic jack body 20. Further, in the present invention, the shapes of the hydraulic body 50, the support body 60, and the safety stopper 70 are not limited to those in the above-described embodiment, and the length thereof can be expanded and contracted by the action of hydraulic pressure, and the space between the beams G and K. The shape is not limited as long as the gap can be closed together with the screw type jack body 10.

Further, the end plates 43, the end plates 55, and the end plates 65 are not limited to the rectangular plate-like ones described above, but may be disc-shaped ones.

Further, the end plate 43 for integrally connecting the screw type jack body 10 and the hydraulic type jack body 20.
The connection between the end plate 55 and the end plate 55 is not limited to the welded connection in the above-described embodiment, and it goes without saying that a bolt and nut connection may be used.

The jack 10 of the present invention is optimal for use in the earth retaining structure for civil engineering and construction of the above-mentioned in-situ sand mixing method (SMW method), but is not limited to this. Instead, it can be suitably used for a replacement construction method, a pack construction method (PIPW construction method), and other mountain suspension structures for civil engineering.

Further, the jack 10 of the present invention can be suitably used for the above-mentioned earth retaining frame for civil engineering and construction, and can also be used in the same manner for other uses of the jack used for general civil engineering and construction work. At the same time, it is needless to say that it can be used in the same manner for other commonly used jack applications.

[0051]

As described above, according to the present invention, the jack in which the screw type jack body and the hydraulic type jack body are axially connected to each other is provided. When it is used for a mountain stop frame, it has an excellent advantage that it can be easily and surely constructed by interposing it between the beams constituting the support work.

That is, by interposing the jack of the present invention between the beams constituting the support work, and applying a hydraulic pressure to the hydraulic jack body in advance to exert a pressure on the beams, the preloading method is performed, whereby the beams are cut. It can absorb elastic compression strain, creep strain, shrinkage due to familiarity of the joint part, and looseness that occurs on the retaining wall, so that it supports the back surface earth pressure applied to the retaining wall and also supports these girders and There is an advantage that the displacement that occurs in the cliff wall can be prevented and the movement that occurs in the support work can be avoided.

Further, since the main piles and the side sheet piles constituting the mountain retaining wall and the uprising and the cutting beam constituting the supporting structure are in close contact with each other, there is a dimensional error between the mountain retaining wall and the supporting structure. Even so, there is an advantage that it becomes possible to carry out the civil engineering construction mountain structure by absorbing the error.

Therefore, with this jack, it is possible to reliably support the back surface earth pressure acting on the cliff wall by supporting work, and prevent accidents such as ground subsidence and sediment collapse. There are advantages.

Further, after adjusting the length of the screw type jack body in advance and interposing it between the cut beams to close the gap between the cut beams,
Since the hydraulic jack is pressurized to extend the length of the hydraulic jack to apply an initial load to the beam, there is an advantage that the preloading method can be performed easily and quickly.

Further, since the length of the screw type jack body is adjusted in advance and then the length of the hydraulic type jack body is extended, the stroke of the hydraulic type jack body becomes extremely short and the amount of oil used becomes short. There is an advantage that the cost can be significantly reduced.

Further, since the length of the hydraulic jack body is extended after adjusting the length of the screw type jack body, the stroke of the hydraulic jack body is extremely short. It has the advantage that it can be made smaller than half of that, and the product price can be significantly reduced.

Further, since the screw type jacks which have become disused or in stock due to the recent popularization of hydraulic type jacks can be reused, it is possible to reduce wastes and effectively use resources. There are advantages.

Further, the jack of the present invention is suitable for use in the above-mentioned earth retaining structure for civil engineering, and also for general civil engineering construction work other than this and other commonly used jacks. Since it can be used as required, it has an extremely large effect in that it can be widely used for general purposes.

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of a jack according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of a civil engineering construction mountain truss structure provided with the jack.

[Explanation of symbols]

 1 Jack 10 Screw Type Jack Body 20 Hydraulic Jack Body 30 Male Thread Body 31 Base 32 Handle 33 Handle 34 Male Thread 35 Shaft 40 Female Thread Body 41 Female Thread 42 Cylindrical Body 43 End Plate 44 Rib Plate 45 Support 50 Hydraulic Body 51 Cylinder hole 51a Expanded hole 51b Female thread 52 Hydraulic cylinder 52a Conducting path 53 Ram piston 53a Recess 53b Coupling 53c Recess 53d Male thread 54 Ram piston retainer 54a Male thread 55 End plate 56 Oil seal 57 Oil 58 Connection nut 59 Hydraulic hose 60 Support Body 61 Coupling Hole 62 Presser Ball 63 Stopper Screw 64 Attachment 64a Female Thread 65 End Plate 66 Rib Plate 70 Safety Stopper 71 Cylinder 72 Handle 73 Female Thread K Cut Beam

Claims (3)

[Claims] 1. A screw-type jack body, in which a male screw and a female screw are screwed together, the length of which is expanded / contracted by screwing of the male screw, and a hydraulic jack body whose length is expanded / contracted by pressurization / depressurization of hydraulic pressure.
A jack characterized by being arranged continuously in the axial direction. 2. A retaining wall composed of a cross sheet pile for receiving earth pressure of the excavated ground and a main pile, and a support structure composed of an uprising and a girder for supporting back earth pressure applied to the wall. 2. The jack according to claim 1, wherein the jack is a preload jack that is interposed between the girders constituting the support work and supports the preload in the civil engineering construction mountain truss structure. 3. The jack according to claim 1, wherein the hydraulic jack body is provided with a stopper for holding a length set by pressurizing and depressurizing the hydraulic pressure.