JP2974976B2 - Girder support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure cylinder type girder support used for earth retaining support.

[0002]

2. Description of the Related Art In general, in a girder support used in this type of shoring support, pins at both ends of a cylinder are arranged between ribs of a pressing plate, and pins are inserted through the ribs and the pads. Pressing plates are swingably attached to both ends of the cylinder. Further, a valve for water injection and pressure release is protruded from a pad on one end side of the cylinder.

[0003] Then, this cutting beam support is inserted between the sheet piles of the earth retaining structure, and both pressing plates are opposed to the protruding parts of the sheet piles. In this state, high-pressure water is supplied from the pump into the cylinder via the valve. Upon injection, the cylinder is extended so that the pressing plate is pressed against the belly. Also, when dismantling the earth retaining structure, when the valve is opened by pressing the head, the cylinder is released and the internal pressure is contracted, so that the girder support can be lifted in this state and removed from the space Has become.

[0004] In this type of girder support, the valve protrudes from a pad on one end of the cylinder.
At the time of each of the above operations, it is necessary to protect the valve so that it does not collide with other objects. For this reason, in the conventional girder support, for example, the rib of the pressing plate corresponding to the valve,
There has been proposed a configuration in which a guard member for protecting the valve is disposed adjacent to the valve and is prevented from coming off by a pin inserted through the rib and the pad.

[0005]

However, in this conventional structure, the guard member is attached to the rib of the pressing plate by one pin. For this reason, when the press plate is swung about the pins with respect to both ends of the valve when the cutting beam support is put in and out of the upright of the sheet pile, the guard member is also swung around the pins. . As a result, there has been a problem that the guard member is separated from the protection position corresponding to the valve, and the valve cannot be protected.

The present invention has been made by paying attention to such problems existing in the conventional technology. It is an object of the present invention to provide a girder support in which a guard member can always be arranged at a protection position corresponding to a valve, and the valve can be reliably protected. The other purpose is to provide a guard member that can maintain sufficient strength, does not hinder the swinging of the pressing plate, and can smoothly insert and remove the sheet pile between the prongs. To provide support.

[0007]

In order to achieve the above-mentioned object, in the girder support according to the first aspect of the present invention, pads provided at both ends of a cylinder are attached between ribs of a pair of pressing plates. And, in a cutting beam support in which a valve for water injection and pressure release is protruded from a pad on one end side of the cylinder, a pair of guard members for protecting the valve between the pad corresponding to the valve and the rib of the pressing plate. And at least one guard portion extending from the mounting portion to the side of the valve, and the pair of mounting portions are integrally connected by a connecting portion.

According to the second aspect of the present invention, in the cutting beam support according to the first aspect, the mounting portion of the guard member is connected to at least a hole or notch through which the valve passes at least at a lower portion of the valve. It is formed in such a way that

According to a third aspect of the present invention, in the cutting beam support according to the first or second aspect, the guard member has a bent portion that engages with a front edge of the pad. According to a fourth aspect of the present invention, in the cutting beam support according to any one of the first to third aspects, a lid is attached to an upper end of the guard member so as to be openable and closable.

According to a fifth aspect of the present invention, in the cutting beam support according to the first or second aspect, the guard portion is formed integrally with the mounting portion in a planar manner to form a mounting guard portion, and the end of the mounting guard portion is provided. Turn the part back to make it a folded guard part,
The folded guard portion is formed integrally with the connecting portion.

[0011] According to the invention described in claim 6, according to claims 1 to 5,
In the girder support according to any one of the above, the cylinder is constituted by a large-diameter cylinder and a small-diameter cylinder, and the cylindrical body is formed so as to fill a gap between the large-diameter cylinder and the small-diameter cylinder. It is provided in.

Therefore, in the girder support according to the first aspect, the pair of mounting portions of the guard member are interposed between the pad and the rib of the pressing plate, and the guard member is integrally mounted on the pad. Can be For this reason, even when the pressing plate is swung with respect to the pads at both ends of the cylinder, the relative position between the guard member and the pad does not change. Therefore,
The guard portion of the guard member can always be arranged at the protection position corresponding to the valve, and the valve can be reliably protected.

Further, since the connecting member is provided between the pair of mounting portions, the guard member can maintain sufficient strength, can smoothly swing the pressing plate, and can protrude between the uprights of the sheet pile. The work of taking in and out of the girder support can be performed smoothly. In the girder support according to claim 2, a hole or notch through which the valve passes is formed at the connecting portion connecting the mounting portions of the guard member so that the mounting portions are connected at least at the lower portion of the valve. I have. For this reason, even when the pressing plate is swung with respect to the pads at both ends of the cylinder, the movement of the guard member is restricted by the connecting portion at the lower part of the valve, and the positional change between the guard member and the pad is prevented.

According to the third aspect of the present invention, in addition to the mounting portion of the guard member being mounted between the pad and the rib of the pressing plate, the bent portion of the guard member is engaged with the front edge of the pad. Thus, the guard member is locked and held to the pad. For this reason, the locking strength of the guard member to the pad can be increased, and the strength of the guard member itself can be increased by forming the bent portion.

In the cutting beam support according to the fourth aspect, when the lid is disposed at the closed position, the upper part of the valve is concealed. Therefore, the valve can be protected from the side by the guard member and also from above by the lid.

According to a fifth aspect of the present invention, the mounting guard portion is formed by integrally forming the guard portion and the mounting portion in a planar shape, and the folded guard portion is formed by folding at the end of the mounting guard portion. , The folded guard portion is formed integrally with the connecting portion. For this reason, the guard member can be easily formed by folding a predetermined portion with a single plate-like body. In addition, since the mounting guard portion and the folded guard portion are integrally formed via the folded portion, the strength of the guard portion can be maintained.

In the girder support according to the sixth aspect, when high-pressure water is injected into the cylinder from the valve, the cylinder is extended by the relative movement of the large-diameter cylinder and the small-diameter cylinder, and the pressing plate is expanded. At this time, a cylindrical body is provided at the opening end of the large-diameter cylinder to fill a gap between the large-diameter cylinder and the small-diameter cylinder. For this reason, it is prevented that small stones, sand, or soil enter the gap and hinder relative movement between the large-diameter cylinder and the small-diameter cylinder. Further, since the small-diameter cylinder slides on the inner peripheral surface of the cylindrical body, rattling between the large-diameter cylinder and the small-diameter cylinder is prevented.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 3, the beam support 11 includes a cylinder 12 and pad 12 at both ends thereof.
a and 12b are provided. A pair of pressing plates 13 and 14
Is a state in which pads 12a and 12b are arranged between each pair of ribs 13a and 14a protruding from the opposing surface.
By inserting a pin 15 from the pad 14a to the pads 12a and 12b, the pin 15 is swingably attached to both ends of the cylinder 12.

A pair of positioning plates 16 having a substantially L-shaped cross section are welded and fixed to the outer surfaces of the pressing plates 13 and 14, and as shown in FIG.
In the case of mounting between the sheet piles 1,
7 is placed on the belly 18. A pair of latch frames 19 are provided with ribs 13a, 14a of the pressing plates 13, 14, respectively.
When the cutting beam support 11 is pulled out from between the sheet piles 17 of the earth retaining structure, a pulling tool or the like is hooked on these latch frames 19 when the cutting beam support 11 is pulled out from between the sheet piles 17.

The valve 20 protrudes from the pad 12a at one end of the cylinder 12 and serves both as an injection plug for injecting high-pressure water into the cylinder 12 and a valve for releasing the internal pressure of the cylinder 12. The valve 20 is projected from the side surface of the pad 12a so as to extend obliquely upward at a predetermined angle with respect to the axis of the cylinder 12, and is opened by pressing its head in the axial direction with a pressure release tool or the like. It has become.

As shown in FIGS. 1 to 4, a pair of guard members 21 are provided at a mounting portion 22 extending to the outer end side with a pad 12 a corresponding to the valve 20 and a rib 13 of the pressing plate 13.
a mounting hole 22 through which the pin 15 is inserted is formed at the outer end side of the mounting portion 22.

The guard portion 24a is formed on the inner end side of the mounting portion 22 of each guard member 21 through a crank-shaped bent portion 25, and a reinforcing rib 26 is formed on the outer surface thereof. The pair of guard portions 24b are integrally formed in a substantially U-shape via a connecting portion 27, and both guard portions 25b are welded to the guard portions 25a to improve the strength of the guard portions 25.

The circular hole 28 is formed in the connecting portion 27 of the guard portion 25b, and the valve 20 is inserted obliquely upward from the outside to the inside. The pressing plates 13 and 14 correspond to the cylinder 1
Even when the guard member 21 is swung with respect to the pads 12a and 12b at both ends, the guard member 2 is connected by the connecting portion 27 of the guard member 21.
The movement of the guard member 21 and the pad 12a is prevented from shifting.

The guard portions 25 of each guard member 21 are extended in parallel at predetermined intervals on both sides of the valve 20 to protect the valve 20 from collision with other objects from both sides. In addition, the guard member 21 is connected to the pad 12a by engaging the bent portions 25 with both side edges of the front surface of the pad 12a.
a.

The lid 29 is attached to the upper end of the guard portion 25 of one guard member 21 via a hinge 30 so as to be openable and closable, and when its free end is closed, the guard portion 25 of the other guard member 21 is closed. So that it comes into contact with the upper end of the Then, in the closed state of the lid 29,
The upper part of the valve 20 is concealed to protect the valve 20 from collision with other objects from above.

Next, the operation of the thus constructed cutting beam support will be described. Well, this girder support 1
In the case where 1 is used for earth retaining support, as shown in FIG.
The positioning plate 16 is placed on the upper surface 8, and the pressing plates 13, 14 are arranged to face the side surfaces of each belly 18. In this state, when high-pressure water is injected into the cylinder 12 from the valve 20 by a pump (not shown), the extension of the cylinder 12 causes the pressing plates 13 and 14 to be pressed against the belly 18, and the both bellies 18 are pressed against the earth pressure or the earth pressure. The concrete is maintained at a predetermined interval while withstanding the concrete casting pressure and the like.

In dismantling the earth retaining structure, when the head of the valve 20 is pressed in the axial direction with a pressure release tool or the like, the valve 20 is opened and the cylinder 12 is contracted by releasing the internal pressure. . In this state, both pressing plates 13, 1
By pulling a pull-out tool or the like on the latch frame 19 on the top 4, the cutting beam support 11 can be raised and pulled out from between the 18 and can be removed.

As described above, the cutting beam support 11 is connected to the sheet pile 17.
When putting in and out between the stomachs 18, both pressing plates 13,
14 is swung about the pin 15 with respect to the pads 12a and 12b at both ends of the valve 12. At this time, the guard members 21 are integrally locked and held on the pad 12a by the engagement between the valve 20 inserted into the circular hole 28 and the connecting portion 27.

Therefore, the relative position between the guard member 21 and the pad 12a does not change with the relative swing between the pressing plate 13 and the pad 12a, and the guard member 21 is always in the protection position corresponding to the valve 20. Are located in Accordingly, the guard portion 24 of the guard member 21 can reliably protect the valve 20 from collision with other objects.

The effects achieved by the above embodiment will be described below. (1) In the girder support of this embodiment, the pair of mounting portions 22 of the guard member 21 are interposed between the pad 12a and the rib 13a of the pressing plate 13, and the guard member 21 is integrated with the pad 12a. Mounted Therefore, even when the pressing plate 13 is swung with respect to the pads 12a at both ends of the cylinder 12, the guard member 21 and the pad 1
There is no possibility that the relative position with respect to 2a changes. Therefore, the guard portion 22 of the guard member 21 can be always disposed at the protection position corresponding to the valve 20, and the valve 20 can be protected reliably. (2) Since the connecting portion 27 is provided between the pair of mounting portions 22, the guard member 21 can maintain sufficient strength, can swing the pressing plate 13 smoothly, and The work of taking in and out the cutting beam support 11 between the raising members 18 can be performed smoothly. (3) A circular hole 28 through which the valve 20 passes is formed in the connecting portion 27 that connects the mounting portions 22 of the guard member 21. Therefore, even when the pressing plate 13 is swung with respect to the pad 12 a of the cylinder 12, the movement of the guard member 21 is restricted by the connecting portion 27 at the lower part of the valve 20,
The position change between the guard member 21 and the pad 12a is prevented. (4) Further, in addition to the mounting portion 22 of the guard member 21 being mounted between the pad 12a and the rib 13a of the pressing plate 13, the bent portion 25 of the guard member 21 is engaged with the front edge of the pad 12a. The guard member 21 is locked and held to the pad 12a. Therefore, the locking strength of the guard member 21 with respect to the pad 12a can be increased, and the strength of the guard member 21 itself can be increased by forming the bent portion 25. (5) In addition, when the lid 29 is disposed at the closed position, the upper part of the valve 20 is concealed, so that the valve 20 can be protected from the side by the guard member 21 and the lid 29 It can also be protected from above. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, parts different from the first embodiment will be mainly described.

As shown in FIG. 5, a pair of left and right mounting guards 32 are provided with the guard 24a and the mounting 22 of the first embodiment.
Are integrally formed in a planar shape. The folded guard portion 33 is folded back at a folded portion 34 at the inner end (lower left portion in the figure) of the mounting guard portion 32, and the mounting guard portion 3 is formed.
2 and is formed so as to extend in parallel with a predetermined interval. An outer end portion (upper right portion in the drawing) of the folded guard portion 33 is formed integrally with the connecting portion 27. Therefore, the guard member 2
1 is formed by sequentially bending one sheet at a predetermined position.

The lid 29 is attached to the attachment guard 32 by a pair of hinges 30, but the position where the hinge 30 is attached is opposite to that of the first embodiment. Then, as shown in FIG. 6, with the valve 20 inserted into the circular hole 28, the outer end side of the mounting guard portion 32 is
a between the rib 13a and the pad 1
It is attached and fixed to the rib 2a and the rib 13a.

According to the second embodiment, the following effects are exhibited in addition to the effects of the first embodiment. (1) Since the mounting guard portion 32 and the return guard portion 33 are integrally formed at a predetermined interval via the return portion 34, the guard member 21 has excellent strength and excellent protection performance for protecting the valve 20. ing. (2) Since the strength of the guard member 21 is high, there is no need to provide the reinforcing rib 26 of the first embodiment on the mounting guard portion 32 or the folded guard portion 33 or to join another member, thereby simplifying the configuration. be able to. In addition, pad 1
There is no need to provide the bent portion 25 of the first embodiment so as to engage with 2a. (3) Since the guard member 21 is formed by sequentially bending a single plate-like body at a predetermined position, its manufacture is easy. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to the drawings. In the third embodiment, parts different from the first and second embodiments will be mainly described.

As shown in FIGS. 8 and 9, the polyurethane cylinder 35 is formed by integrating one end of an inner cylinder 36 having a small diameter and an outer cylinder 37 having a large diameter with a bottom wall 38. As shown in FIG. 7, the cylinder 12 includes a large-diameter cylinder 12c and a small-diameter cylinder 12 that reciprocates inside the large-diameter cylinder 12c.
d. The cylinder 35 is a large-diameter cylinder 12
c is attached to the open end.

As shown in FIG. 8, the annular recess 39 is
5 is formed between the inner cylinder 36 and the outer cylinder 37, and the open end of the large-diameter cylinder 12c is fitted. The insertion hole 40 is formed by the inner cylinder 36 of the cylinder 35, and the small-diameter cylinder 12d
Are slidably inserted into the inner peripheral surface of the inner cylinder 36.

As shown in FIG. 7, when this cutting beam support 11 is used for earth retaining support, high-pressure water is injected into the cylinder 12 from the valve 20 by a pump, and the large-diameter cylinder 12c and the small-diameter cylinder 12d are used. Due to the relative movement of the cylinder 12, the cylinder 12 is extended, and the pressing plates 13, 14 are expanded.

At this time, the cylindrical body 35 is attached to the open end of the large-diameter cylinder 12c, and the gap between the large-diameter cylinder 12c and the small-diameter cylinder 12d is filled.
A large diameter cylinder 1
This prevents the relative movement between the small cylinder 2d and the small diameter cylinder 12d from being hindered. In addition, since the small-diameter cylinder 12d slides on the inner peripheral surface of the inner cylinder 36 of the cylindrical body 35, rattling between the large-diameter cylinder 12c and the small-diameter cylinder 12d is prevented, and the relative displacement between the large-diameter cylinder 12c and the small-diameter cylinder 12d. Movement is performed smoothly. In addition, the work at the time of transporting, installing, and ending the work of the girder support 11 can be performed smoothly.
For this reason, handling of the cutting beam support 11 can be facilitated.

Further, the large-diameter cylinder 12
c and the small-diameter cylinder 12d are prevented from entering the gap between the small-diameter cylinder 12d and the large-diameter cylinder 12d.
c and the small-diameter cylinder 12d are prevented from being damaged. Therefore, the durability of the cylinder 12 can be improved.

The present invention can be embodied with the following modifications. (A) As shown in FIG. 10, the mounting portions 22 and the guard portions 24 of the pair of guard members 21 are integrally formed by a single plate via the bent portion 25, and the space between the guard members 21 is formed. It is connected by welding at the plate-shaped connecting portion 27.
Further, a notch 3 having an open upper portion is provided at the center of the connecting portion 27.
1 so that the valve 20 can be inserted. That is, the connecting portion 27 is connected below the valve 20.

With such a configuration, the configuration of the guard member 21 is simplified, and the guard portion 24 can be always disposed at the protection position corresponding to the valve 20, so that the valve 20 can be reliably protected. it can. (B) As shown in FIG. 11, the pair of guard portions 24 and the connecting portion 27 are integrally formed at a lower portion on the outer end side of the guard portion 24, and the upper portion of the guard portion 24 is bent to form a bent portion 25.
forming a. In addition, a bent portion 25b is formed by bending the inner end side of the mounting portion 22, and is fixedly joined to the bent portion 25a. Furthermore, a notch 31 is provided above the connecting portion 27 so that the valve 20 can be inserted therethrough.

Even with such a configuration, the guard portion 24 can protect the valve 20 reliably. (C) Without providing a hole or notch in the connecting portion 27,
An elongated rectangular plate-like connecting portion is provided at a lower portion of the valve 20 to connect between both mounting portions 22. (D) One guard member 21 is disposed between one side of the pad 12 a corresponding to the valve 20 and one rib 13 a of the pressing plate 13, and the guard member 21 is substantially laterally placed on the upper end of the guard portion 24 of the guard member 21. An L-shaped lid 28 is attached so as to be openable and closable.

In such a configuration, one side of the valve 20 can be protected by the guard member 21, and the other side and the upper side of the valve 20 can be protected by the lid 29. (E) The guard member 21 is also provided between the pad 12b on the side without the valve 20 and the rib 14a of the pressing plate 14, so that the handling of the girder support is made easier. (F) The configuration of the guard member 21 of the present invention is embodied in a girder support in which the valve 20 is erected upward from the pad 12a of the cylinder 12 perpendicularly to the axis of the cylinder 20. (G) Connecting portion 27 of guard member 21 of the second embodiment
Is provided with the notch 31 shown in FIG. 10 or FIG. (H) In the second embodiment, the return guard portion 33
With respect to the mounting guard portion 32, so that the distance between the folded guard portion 33 and the mounting guard portion 32 gradually increases toward the outer end side.

With such a configuration, the number of bent portions of the guard member 21 can be reduced, and the manufacture can be performed more easily. (I) The mounting guard portion 32 and the return guard portion 33 are tilted so as to correspond to the direction in which the bulb 20 extends and to become higher toward the inner end side.

In this case, the protection of the valve 20 can be performed more effectively. (J) As shown in FIGS. 12 and 13, an annular ridge 41 is formed on the inner peripheral surface of the inner cylinder 36 so as to be in sliding contact with the outer peripheral surface of the small-diameter cylinder 12d.

In the case of such a configuration, the large-diameter cylinder 1
Small stones, sand, or soil enter the gap between the large-diameter cylinder 12c and the small-diameter cylinder 12c.
d is more effectively prevented from hindering the relative movement of the cylinders 12c and 12d, and rattling between the large-diameter cylinder 12c and the small-diameter cylinder 12d is effectively prevented.
The relative movement of d is performed more smoothly. (K) As the material of the cylindrical body 35, a synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride; a synthetic rubber such as polyurethane rubber or silicone rubber; or a metal such as aluminum or copper. (L) The cylindrical body 35 is bonded and fixed to the opening end of the large-diameter cylinder 12c with an adhesive.

In this manner, the cylindrical body 3 is formed by repeating the relative movement of the large-diameter cylinder 12c and the small-diameter cylinder 12d.
5 can be prevented from coming out of the open end of the large-diameter cylinder 12c, and the girder support 11 can be used in a stable state for a long period of time. (M) The cylindrical body 35 is formed integrally with the open end of the large-diameter cylinder 12c.

In this case, the labor for fitting the cylinder 35 into the large-diameter cylinder 12c can be saved. (N) The cylindrical body 35 is formed in a cylindrical shape, and is joined and fixed to the inner peripheral surface of the inner cylinder 36.

With this configuration, the configuration of the cylinder 35 can be simplified, and the possibility that the cylinder 35 comes off the opening end of the large-diameter cylinder 12c can be prevented.

Further, the technical idea grasped from the above embodiment will be described below. (1) The girder support according to claim 2, wherein the hole is a circular hole, and the upper and lower portions of the circular hole in the connecting portion connect the two mounting portions.

With this configuration, even when the pressing plate is swung with respect to the pads at both ends of the cylinder, the movement of the guard member with respect to the pad is restricted. The valve can always be placed in the protection position where the valve is to be protected, and the valve can be reliably protected. (2) The guard member according to claim 2, wherein the guard portion and the mounting portion are formed in a crank shape through a bent portion, and the guard portion connected by a connecting portion is fixed to the guard portion. Girder support.

According to this configuration, the strength of the guard portion can be increased, and the guard member can be made strong. (3) The cutting beam support according to claim 2, wherein the notch is formed in a substantially U-shape such that an upper portion is opened in a connecting portion.

With this configuration, the valve can be easily inserted into the notch of the connecting portion, and the guard member can be easily assembled to the pad. (4) The girder support according to claim 3, wherein the guard member is formed in a crank shape through a bent portion, and a reinforcing rib is formed on a side surface of the guard portion.

With this configuration, the required strength can be exhibited even if the thickness of the guard member is reduced. (5) The cutting beam support according to (4), wherein the reinforcing rib has a lateral U-shape.

According to this configuration, the strength of the guard member can be further increased. (6) The girder support according to claim 5, wherein the folded guard portion is formed so as to extend substantially parallel to the mounting guard portion.

With this configuration, the guard member can be easily manufactured while maintaining its strength. (7) In the cylindrical body, one end of an inner cylinder having a small diameter and an outer cylinder having a large diameter are integrally formed by a bottom wall, and an annular recess is formed by the inner cylinder and the outer cylinder. 7. A structure in which an open end of a cylinder is fitted.
Cut beam support as described in.

With this configuration, the cylindrical body can be easily mounted on the open end of the large-diameter cylinder, and the gap between the large-diameter cylinder and the small-diameter cylinder can be filled.

[0058]

The present invention is configured as described above, and has the following effects. According to the girder support of the invention according to claim 1, the guard portion of the guard member can always be arranged at the protection position corresponding to the valve,
The valve can be reliably protected.

Further, since the guard member has the connecting portion between the pair of mounting portions, sufficient strength can be maintained, the pressing plate can be smoothly swung, and the gap between the uprights of the sheet pile can be maintained. The work of taking in and out of the girder support can be performed smoothly.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention, even when the pressing plate is swung with respect to the pads at both ends of the cylinder, the movement of the guard member is regulated by the connecting portion at the lower part of the valve, and the positional change between the guard member and the pad can be prevented. .

According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the second aspect, the strength of locking the guard member to the pad can be increased, and the strength of the guard member itself can be increased by forming the bent portion.

According to the invention set forth in claim 4, according to claim 1,
In addition to the effects of any one of the inventions of (1) to (3), the valve can be protected from the side by the guard member, and also can be protected from above by the lid.

According to the invention set forth in claim 5, according to claim 1,
In addition to the effect of the second aspect, the guard member can be easily formed by folding a predetermined portion with a single plate-like body, and the mounting guard portion and the folded guard portion are integrated with each other via the folded portion. Since it is formed, the strength of the guard portion can be improved.

According to the invention set forth in claim 6, according to claim 1,
In addition to the effects of any one of the inventions of (1) to (5), a cylinder is provided at the open end of the large-diameter cylinder to fill a gap between the large-diameter cylinder and the small-diameter cylinder. For this reason, it is possible to prevent pebbles, sand or soil from entering the gap and hindering the relative movement of the two cylinders. In addition, since the small-diameter cylinder slides on the inner peripheral surface of the cylinder, it is possible to prevent rattling between the large-diameter cylinder and the small-diameter cylinder, and to smoothly perform the relative movement between the large-diameter cylinder and the small-diameter cylinder. . Therefore, handling of the girder support can be facilitated.

In addition, since the cylindrical body can prevent pebbles, sand or soil from entering the gap between the two cylinders, it is possible to prevent the large-diameter cylinder and the small-diameter cylinder from being damaged. As a result, the durability of the cylinder can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a girder support according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a use state of the girder support.

FIG. 3 is a partially enlarged plan view of the girder support.

FIG. 4 is an exploded perspective view showing a guard member and a lid.

FIG. 5 is an exploded perspective view showing a guard member and a lid according to a second embodiment.

FIG. 6 is a partially enlarged perspective view showing a state where a guard member is attached to a pad.

FIG. 7 is a perspective view showing a cutting beam support according to a third embodiment.

FIG. 8 is a cross-sectional view showing a state where the cylindrical body is mounted on an open end of a large-diameter cylinder.

FIG. 9 is a perspective view showing a cylindrical body.

FIG. 10 is a perspective view showing another example of the guard member.

FIG. 11 is a perspective view showing still another example of the guard member.

FIG. 12 is a sectional view showing a state in which a cylinder as another example is mounted on a cylinder.

FIG. 13 is an enlarged sectional view showing a portion of an annular ridge of the cylindrical body of FIG. 12;

[Explanation of symbols]

11: Cut beam support, 12: Cylinder, 12a, 12b
... Pad, 13, 14 ... Pressing plate, 13a, 14a ... Rib, 20 ... Valve, 21 ... Guard member, 22 ... Mounting part,
24, 24a, 24b ... guard part, 25, 25a, 25
b: bent portion, 27: connecting portion, 28: circular hole, 29: lid,
31: Notch, 32: Mounting guard part, 33: Fold guard part.

Claims (6)

(57) [Claims] 1. A cutting beam support in which pads provided at both ends of a cylinder are attached between ribs of a pair of press plates, and a valve for water injection and pressure release is provided on a pad at one end of the cylinder. A pair of mounting portions of a guard member for protecting the valve are interposed between the pad corresponding to the valve and the rib of the pressing plate, and at least one guard portion extending from the mounting portion to the side of the valve is provided. And a cutting beam support in which the pair of mounting portions are integrally connected by a connecting portion. 2. The girder support according to claim 1, wherein a hole or a notch through which the valve passes is formed at a connection portion of the guard member so that both mounting portions are connected at least at a lower portion of the valve. 3. The girder support according to claim 1, wherein the guard member has a bent portion that engages with a front edge of the pad. 4. The girder support according to claim 1, wherein a lid is attached to the upper end of the guard member so as to be openable and closable. 5. The guard portion is formed integrally with the mounting portion in a planar shape to form a mounting guard portion, and an end of the mounting guard portion is folded back to form a folded guard portion, and the folded guard portion is integrally formed with a connecting portion. A cutting beam support according to claim 1. 6. The large-diameter cylinder and a small-diameter cylinder, wherein the cylinder is provided at an open end of the large-diameter cylinder so as to fill a gap between the large-diameter cylinder and the small-diameter cylinder. A cutting beam support according to any one of Items 1 to 5,