JPH06167025A - Opening and closing strut device - Google Patents

Abstract

PURPOSE:To improve the work efficiency and safety without the need of turning in a work for laying a buried structure by an open cut work. CONSTITUTION:The forward ends of strut element 1, 2, the base ends of which are rotatable attached by a shaft to an earth retaining material 21, are connected to each other. An elongation and contraction device 4 for connection is provided on the strut elements, and a safety cylinder 8d is externally fitted to the connecting part. Coiled springs 7b or the like for energizing the strut elements 1, 2 in a horizontal position are disposed between the strut element 1, 2 and the earth retaining material 31. When a buried structure 32 is lowered, a safety cylinder moving lever 9 and a strut parting lever 10 are sequentially operated by the weight of the structure 32 above the connecting part. While the safety cylinder 8d is moved from the connecting position, the strut elements 1, 2 are parted by the contraction of the elongation and contaction device 4 and opened downward, with the rotatably supporting part 3 in the center. After the buried structure 32 passes, the strut elements 1, 2 are returned to their initial horizontal positions by the energizing force of the coiled springs 7b or the like. After that, the elongation and contraction device 4 is elongated to connect the strut element 1, 2 to each other, and further the safety device 8d is returned to the connecting position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a girder device which can be opened and closed and is used as a support material for mountain retaining works during excavation work.

[0002]

2. Description of the Related Art In excavation work, as a horizontal member for supporting a mountain retaining material, a crossbeam is installed between opposing mountain retaining materials.

Steel cutting beams are generally used as cutting beams.
For example, they are installed at required intervals in the continuous direction of the excavation groove and in the up-down direction in the form of supporting the waving that presses the sheet pile and the like.

[0004]

In the excavation work using a cutting beam as described above, when installing various pipes and other buried objects in the excavation groove, the cutting beam becomes an obstacle. Therefore, when the buried object is hung in the excavation trench, the work of reassembling the beams is required, which not only complicates the construction but also causes a problem of safety during the work of reassembling.

The present invention has been made to solve the above-mentioned problems, and provides an open / close type traverse device which is excellent in workability and safety that does not require refilling in laying buried objects by excavation work. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION The device of the present invention is a cutting beam device for supporting a mountain retaining member composed of a sheet pile, an uprising, etc., installed in an excavation trench, the cutting beam having two cutting beams. It is composed of truss elements and can be opened and closed by dividing and connecting the truss elements. The two girder elements are pivotally attached to one of the mountain retaining members whose base ends are opposed to each other, and can be rotated around the pivoted parts, and the member axes are aligned to connect the tip ends to each other. Consists of a beam.

The simplest method of connecting the beam elements is as follows.
For example, a method of connecting by connecting a cylindrical connecting member fitted to the outer periphery of one of the beam members to the connecting portion between the beam elements,
A method of connecting along a rod-shaped or plate-shaped connecting member, a method of connecting with a hook-shaped connecting member, and the like are conceivable. However, in this case, it is necessary to have a structure or a cross section that can secure the strength as a beam in the connection portion.

Further, a jack or an air bag is interposed at the connecting portion between the cutting beam elements, or a wedge is inserted between the uprising member and the base end portion of the cutting beam element to form the cutting beam element. It is also conceivable to introduce an axial force into the to strengthen the connection state.

In addition to this, at least one of the cutting beam elements is provided with a cutting beam element expanding / contracting device for axially expanding / contracting the cutting beam element, and the cutting beam element is rotated about the base end portion in a contracted state. It is conceivable to extend the truss element at the time of connection so that stress can be transmitted as an integral truss.

Further, with respect to these beam members, spring means for urging the beam elements to their connecting positions (usually, the position where the beam elements are horizontal) are provided so that an embedded object or the like can be removed. It is possible to automatically return the open girder element to the connecting position when passing it through.

The mountain retaining material referred to here excludes the beams.
It refers to sheet piles, upsets, and other members used as mountain retaining works in excavation work.

The open / close type beam device according to the present invention is usually provided with two upper and lower beams.
When more than one step is provided and an embedded object or the like passes through, the beam device other than the passing position is in the connected state.

An expansion / contraction device for expanding / contracting the truss element is
A hydraulic jack, a hydraulic jack, a mechanical type having a spring mechanism or a link mechanism, etc. are not particularly limited. Such an expansion / contraction device may be used for one of the two beam elements, and the other may be a steel material such as an ordinary steel pipe or shaped steel.
It is also possible to provide truss element expansion and contraction means on both.

In the state in which the trellis element expansion / contraction device is contracted, the weight of the buried object or the like acts on the trellis element, so that the trellis element opens downward and allows the buried object or the like to pass through. Regarding the above, there are a case of manual and a case of automatic.

In the case of manual operation, for example, when the expansion / contraction device is a hydraulic jack, a hose connected to the hydraulic pump may be provided with an operation section composed of a one-touch nipple or the like. Type switches, levers, etc. can be used.

The simplest automatic method is to use the weight of the buried object, and a cutting beam dividing lever is provided above the connecting portion between the cutting beam elements to bury it in the excavation groove. When hanging an object or the like, the lever can be operated by contacting the buried object or the like and receiving a load, so that the connection between the beam members can be cut off by contraction of the expansion device. In addition, it is possible to operate the telescopic device by an electric switch using various sensors.

In order to return the cutting beam element to the connecting position, in addition to lifting it to a predetermined position by hand, it is conceivable to use various spring materials and gas dampers as the above-mentioned spring means. An appropriate one may be used depending on the position and usage. Further, there may be a case where two or more types of spring means are used together, such as a case where two or more cutting beam devices are provided.

For example, in the connected state, the tip ends of the trellis elements are brought into a state in which a knock pin provided on one side is fitted into a pin hole provided on the other side and a pressing force is applied by the trellis element expansion / contraction means. , Can be integrated as a cross beam, but a safety device consisting of other auxiliary connecting members and stoppers is further provided at the connecting portion, and even if a falling object hits the cross beam, Can be prevented from opening carelessly.

Regarding the form of the safety device, a cylindrical one,
Rod-shaped or plate-shaped along the beam element, cover-shaped covering the connection part, and pin type, wedge type,
Combinations with other fasteners are possible. Also,
Regarding the operation of this safety device, it may be manual or automatic.

That is, in the case of manual operation, the safety device is directly removed by hand, or an operating portion for releasing the safety device is provided at the connecting portion or at a position apart from the connecting portion to suspend an embedded object or the like. At the time of unloading or the like, the connection state by the safety device may be released.

In the case of automatic operation, a safety device release lever may be provided above the connecting portion and actuated by utilizing the weight of the buried object, etc., as in the case of the cutting beam dividing lever described above.

[0022]

EXAMPLES Next, the illustrated examples will be described.

FIG. 1 and FIG. 2 show a first embodiment of a retractable truss device of the present invention.

The mountain retaining material 31 is a sheet pile 31a along the ground surface.
Is held by the two-stage uprising 31b and the vertical beams 31c arranged thereon, and the cutting beam device of the present invention is provided between the opposing vertical beams 31c.
These mountain retaining materials 31 are supported by being arranged in steps.

Each of the cutting beam devices is formed by connecting two cutting beam elements 1 and 2 in the central portion of the device, and the base end portion is axially attached to a vertical beam 31c constituting the mountain retaining member 31, and the axial attachment portion 3 is provided. It is possible to rotate around. Further, a spring member 7 for returning the beam elements 1, 2 to the horizontal connection position is attached to the shaft attaching portion 3.

As shown in FIG. 3, one of the trellis elements 1 is provided with a hydraulic jack having a coil spring 4a as an expansion / contraction device 4 so that the expansion / contraction can be performed in the axial direction. On the upper surface of the tip portion, when the water drain valve 4b and the buried object or the like are suspended, the water drain valve 4b is opened by the contact of an object from above, and a cut beam dividing lever 10 for dividing the cut beam elements 1 and 2 is provided. There is a knock pin 5 at the tip.

As shown in FIGS. 4 and 5, the other beam member 2 has a guide tube 8a and a guide tube 8a having a shape in which a tip end thereof hangs along both side surfaces from the upper surface and both ends thereof are projected. A protective cover 8b is provided to cover the upper surface of the guide cylinder 8a, and the tapered pin 8c penetrates between both ends of the guide cylinder 8a. In addition, a pin hole 6 into which the knock pin 5 is fitted is provided at a position facing the knock pin 5 of the trellis element 1.

As shown in FIG. 6, the two beam members 1 and 2 are formed by extending a telescopic device 4 composed of a hydraulic jack.
The knock pin 5 at the tip is fitted into the pin hole 6, and the member beams are aligned to form a horizontal beam. In this connected state, the upper surface and the side surface of the connecting portion are the guide cylinders 8.
Protected by a and the protective cover 8b, damage due to contact with other objects is prevented. Further, by inserting the taper pin 8c, the lower surface side of the connecting portion is supported.

Girder cutting lever 1 for opening the drain valve 4b
In order to prevent water from being accidentally drained by hitting a falling object or the like, 0 indicates as shown by the chain double-dashed line in FIG.
It is turned backward about the axis of the base end, and is tilted forward to set the drainage valve 4b when the buried object is hung down. At this time, the protective cover 8b is turned upside down.

Further, as shown in FIG. 1, one end of the cutting beam device arranged in the lower stage is axially attached to the vertical beam 31c of the mountain retaining material 31 and the other end slides along the cutting beam element 1. A movable water supply lever 17 is attached. A water supply jack 18 is provided at the lower end of the vertical beam 31c, and the water supply jack 18 is pushed through a link 19 that interlocks with the water supply lever 17 so that the pressurized water in the jack is sent to the water pressure jack 18 through a water supply pipe 20. There is. A one-touch joint 21 is attached to the upper end of the water supply pipe 20, and pressurized water can be supplied also from a pump provided outside the excavation groove. In the figure, 22 is a release valve for letting out excess pressurized water.

In the mountain retaining method using this open / close type beam cutting apparatus, when the buried object 32 such as a laying pipe is hung in the excavation groove, the beam cutting lever 10 above the connecting portion is pulled out with the taper pin 8c pulled out. When the buried object 32 comes into contact with, the weight of the buried object 32 opens the water drain valve 4b by the beam cutting lever 10 to release the water pressure. At this time, the trellis element 1 is contracted by the force of the coil spring 4a in the contraction device 4 composed of a hydraulic jack, and the two trellis elements 1 and 2 that have been butted are separated from each other, and the shaft attachment portions 3 respectively As a result, the embedded object 32 can be hung down as shown in FIG. When the embedded object 32 passes, the spring member 7 works and the two beam members 1, 2 return to the horizontal position. At this time, the guide tube 8a
The cut beam element 2 provided with is returned first, and then the other cut beam element 1 is guided by the guide tube 8a to return to the fixed position. After the two girder elements 1, 2 are aligned in a straight line, pressurized water is sent to a contracting device 4 composed of a hydraulic jack, the girder element 1 is extended, and the ends thereof are butted and fixed to form a horizontal girder.

In the present embodiment, the buried object 32 approaches the traverse elements 1, 2 of the lower traverse device, contacts the water feed lever 17, and pushes this downward, so that the water feed jack 18 is connected via the link 19. Press to send the pressurized water into the contractor of the upper beam device. Therefore, the embedded object 32 comes into contact with the cutting beam dividing lever 10 of the lower cutting beam device so that the lower cutting beam elements 1 and 2 are contacted.
Prior to the opening, the two cutting beam elements 1 and 2 of the upper cutting beam device can be butt-fixed and fixed to automatically form a horizontal cutting beam.

In the present embodiment, only one of the beam members 1 is provided with the contracting device 4 so that it can be expanded and contracted.
Both may be stretchable. The device can also be directly attached to the abdomen 31b or the like.

FIG. 8 shows the installed state of the opening / closing type beam device according to the second embodiment of the present invention, and FIG. 2 shows a modified example corresponding to the upper beam device of FIG. is there.

Also in the second embodiment, the cutting beam device is used as the pile retaining material 3 such as a sheet pile.
It is provided between the upper and lower two stages. Each girder device is one in which two girder elements 1, 2 are connected at the center of the device,
A safety cylinder 8d as a safety device is externally fitted to the connecting portion. In FIG. 9, the safety cylinder 8d is shown in cross section.

Each of the truss elements 1, 2 has a mountain retaining material 3 at its base end.
It is pivotally mounted on the shaft 1 and is rotatable about the shaft mounting portion 3 within a vertical plane. Also in the case of the present embodiment, it is not always necessary to rotate in the vertical plane, and the shaft of the shaft mounting portion 3 may be oblique, or the shaft mounting portion 3 may be a universal joint. For example, when the axis of the shaft attachment portion 3 is oblique, there is also an advantage that the distance by which the truss elements 1, 2 are lowered becomes shorter than when the axis attachment portion 3 is horizontal.

One of the trellis elements 1 constitutes an expansion / contraction device 4 composed of a hydraulic jack or the like, and can be expanded / contracted in the axial direction. In the connection state of the beam, the expansion device 4 is extended, the knock pin 5 at the tip of the beam element 1 is fitted into the pin hole 6 at the tip of the beam element 2 on the other side, and the outside of the pin is inserted by the safety tube 8d as described above. The cover prevents the beam from accidentally opening due to a fallen object or some other reason.

The safety cylinder 8d is connected to the truss beam element 2 by a spring 11, and the spring 11 biases the safety cylinder 8d toward the connecting position between the truss beam elements 1 and 2. Therefore, by moving the safety cylinder 8d axially rearward of the truss element 2 against the biasing force, the connection state can be released by the safety cylinder 8d.

This release is performed by the L provided on the upper part of the beam element 2.
It is performed by a safety cylinder moving lever 9 having a character shape. That is, one end of the L-shaped safety cylinder moving lever 9 is located above the connection position of the truss elements 1 and 2 as a force applying portion, and the other end thereof has a rear diameter expansion of the safety cylinder 8d as shown in FIG. When the force is applied to the force applying portion from above by a predetermined amount or more, the L-shaped safety cylinder moving lever 9 rotates about the central shaft attachment portion to move the safety cylinder 8d. Let

The safety cylinder moving lever 9 is not simply locked, but, for example, a long groove is formed on the side surface of the safety cylinder 8d, and the end opposite to the force applying portion is axially attached to the long groove. Good. In addition, a roller 9a (see FIG. 9) is provided in the force applying portion so that the embedded object 32 such as a steel pipe can be smoothly hung when the buried beam 32 is hung while the beam is opened.

Reference numeral 12 in the drawing denotes L provided at the base of the beam member 2.
The safety cylinder fixing lever has a character shape. When the safety cylinder moving lever 9 is operated, the safety cylinder 8d moved rearward can be locked and fixed by the locking portion 12a at the tip. That is,
When the buried object 32 passes and the cutting beam is returned to the original state, if the safety cylinder 8d returns by the biasing force of the spring 11 before the cutting beam elements 1 and 2 become horizontal, the cutting beam element 1 , It is difficult to connect the two automatically, but the safety tube fixing lever 12
The problem is solved by fixing with. The safety cylinder fixing lever 12 has a shaft with the truss element 2 when the truss element 2 is returned to the horizontal state, the base portion 12b opposite to the locking portion 12a hits the stopper 13 provided on the mountain retaining member 31. The safety cylinder 8d is unlocked by rotating at the attachment part.

On the other hand, the expansion / contraction device 4 has an L for contracting the expansion / contraction device 4 and disconnecting the connection state between the beam members 1, 2.
A trellis-shaped beam dividing lever 10 is provided, and a force greater than a predetermined amount acts on the force applying portion provided above the connection position to rotate about the shaft attachment portion and contract the expansion / contraction device 4. To function. If the telescopic device 4 is a hydraulic jack,
The girder cutting lever 10 has a function of opening the drain valve. In addition, the expansion / contraction device 4 may be a link mechanism operated by the cutting beam dividing lever 10. The beam dividing lever 10 is connected to the main body of the expansion / contraction device 4 by a spring 14.

After passing through the buried object 32, in the case of the upper beam device, the compressed gas damper 7a expands to its original state, whereby the beam elements 1 and 2 are returned to the horizontal position, and the expansion device 4 is expanded.
And the safety cylinder 8d is sequentially returned to the original position in the connected state. In FIG. 2, 15 is a stopper for adjusting the beam member 1 to a horizontal connection position.

In the case of the lower beam device, the buried object 32
As the coil spring 7b in the expanded state is contracted under the weight of, the beam members 1, 2, the expansion device 4 and the safety cylinder 8d are sequentially returned to the original position in the connected state, as in the case of the upper stage. To do.

FIG. 10 and FIG. 11 show a third embodiment of the opening / closing beam system of the present invention. This embodiment is similar to the manually operated member in the second embodiment, except that the safety cylinder moving lever 9, the cut beam dividing lever 10 and the members related thereto which are automatically operated by the weight of the buried object 32 and the like in the second embodiment are eliminated. It has the function of.

That is, when suspending the buried object 32 or the like,
If there is a misalignment or the like with respect to the excavation groove, it is possible that the safety cylinder moving lever 9 and the girder cutting lever 10 may not come into contact with each other.
When some misalignment is allowed, manual operation may be easier. The third embodiment is mainly intended for such a case.

When the safety cylinder 8d of the connecting portion is moved and the expansion / contraction device 4 is contracted, when the embedded object 32 is hung, the weight of the embedded object 32 is used to push open the beam members 1 and 2. The configuration in which the traverse elements 1 and 2 are returned to the horizontal position by the gas damper 7a or the coil spring 7b after the buried object has passed is similar to that of the second embodiment.

In the present embodiment, instead of providing the safety cylinder moving lever 9 above the connection portion, the safety cylinder 8 externally fitted to the connection portion is provided.
d is directly grasped by a hand, or is pulled by an operation of a pulling lever 23 or the like provided on the mountain retaining material 31 via a rope, a wire, a pulley or the like, and the locking portion 2 at the tip of the safety cylinder fixing lever 24
Temporarily stop at 4a.

In the figure, 11 is a spring for urging the safety cylinder 8d to the connecting portion of the truss elements 1 and 2 in a state where the device of the present invention acts as a horizontal truss. The tube 8d protects the connection portion and prevents axial buckling.

Also, the expansion / contraction device 4 is expanded / contracted by the operation of the one-touch nipple 25 or the like provided on the mountain retaining material 31 or the like, instead of providing the cutting beam dividing lever 10 above the connecting portion.

As a procedure in construction, when connecting the buried object 32 or the like, first, the safety cylinder 8d is moved and temporarily fixed by the safety cylinder moving lever 9, and then the expansion / contraction device 4 is operated by operating the one-touch nipple 25. When contracted, in this state, the girder elements 1, 2 are pushed downward by the weight of the buried object 32 and the like,
After passing through the buried object 32 and the like, the beam members 1 and 2 are returned to the horizontal position by the gas damper 7a or the coil spring 7b. Then, the expansion device 4 is extended by operating the one-touch nipple 25, and the temporary fixing of the safety cylinder 8d is released.
The original connection status can be restored.

[0052]

[Effect of the Invention] When excavating an embedded object in excavation work, the beam automatically opens due to the weight of the embedded object, and after passing through the embedded object,
By returning to the original position, the work of reassembling the conventional beam is unnecessary, and workability is greatly improved.

By providing the safety device at the connecting portion between the beam members, it is possible to prevent the beam from being opened accidentally due to a fallen object or the like.

After passing through the buried object, it can be immediately restored to its original state, and again functions as an integrated beam, so that construction safety is high.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an excavation groove showing a state in which a device according to a first embodiment of an open / close beam system of the present invention is installed.

FIG. 2 is a plan view corresponding to FIG.

FIG. 3 is a cross-sectional view of the truss element on the side provided with the expansion device.

FIG. 4 is a view of the tip portion of the other beam member viewed from a direction perpendicular to the material axis.

FIG. 5 is a view corresponding to FIG. 4 seen from the material axis direction.

FIG. 6 is a cross-sectional view of a connecting portion where the beam elements are butted against each other.

FIG. 7 is a cross-sectional view of the upper part of the excavation groove showing a state in which the truss element is rotated by the load of the buried object.

FIG. 8 is a vertical cross-sectional view of an excavation groove showing a state in which the device is installed in the second embodiment of the open / close beam system of the present invention.

9 is a front view (partially sectional view) corresponding to the upper beam device in the embodiment of FIG.

FIG. 10 is a vertical cross-sectional view of an excavation groove showing a state where the device is installed in a third embodiment of the open / close beam system of the present invention.

11 is a front view (partial cross-sectional view) corresponding to the upper beam device in the embodiment of FIG.

[Explanation of symbols]

1, 2 ... Beam element, 3 ... Shaft attachment part, 4 ... Expansion / contraction device, 4a ...
Coil spring, 4b ... drain valve, 5 ... knock pin, 6
... pin hole, 7 ... spring material, 7a ... gas damper, 7b ... coil spring, 8 ... safety device, 8a ... guide tube, 8b
… Protective cover, 8c… Taper pin, 8d… Safety cylinder, 9
… Safety cylinder moving lever, 10… Cut beam dividing lever, 11… Spring, 12… Safety cylinder fixing lever, 13… Stopper, 14
... Spring, 15 ... Stopper, 16 ... Induction fitting, 17 ... Water supply lever, 18 ... Water supply jack, 19 ... Link, 20 ...
Water pipe, 21 ... One-touch joint, 22 ... Release valve, 23 ... Tension lever, 24 ... Safety cylinder fixing lever, 24
a ... Locking part, 25 ... One-touch nipple, 26 ... Hose, 31 ... Mountain retaining material, 31a ... Sheet pile, 31b ... Raised 3
1c ... Vertical beam, 32 ... Buried object

Front page continuation (72) Inventor Akira Nakagawa 4 Sumitomo Construction Co., Ltd. 13-13 Arakicho, Shinjuku-ku, Tokyo (72) Inventor Rokuro Ota 460-4 Nishiarai, Omiya-shi, Saitama Egawa Machinery Co., Ltd.

Claims (7)

[Claims] 1. A girder device for supporting a mountain retaining material installed in an excavation trench, wherein a base end portion of the beam is pivotally attached to one of the opposing mountain retaining materials and is rotatable. Having two girder elements that form a girder by connecting the tip parts to each other,
An open / close type beam device which can be opened and closed by dividing and connecting the beam elements. 2. The spring means for connecting the cutting beam element and the mountain retaining member and for urging the cutting beam element to a connecting position between the cutting beam elements is provided. Opening and closing beam device. 3. A truss element expanding / contracting device is provided on at least one of the truss elements.
The open-close type beam device described. 4. Above the connection between the beam elements,
A cutting beam dividing lever for contracting the cutting beam element expansion / contraction device to disconnect the cutting beam elements from each other is provided, and when the buried object is hung in the excavation groove, the cutting beam is loaded by the buried object. The opening / closing type beam device according to claim 3, wherein the dividing lever is operated. 5. The open / close beam apparatus according to claim 3 or 4, wherein an auxiliary connecting member is provided at a connecting portion between the beam elements, and the disconnection elements are prevented from being separated by rotation. An opening / closing type beam device characterized by having a device. 6. The open / close type beam device according to claim 5, wherein a safety device release lever for releasing the connection by the safety device is provided above the connection portion between the beam elements. When hanging up buried objects,
An opening / closing type beam device, wherein the safety device release lever is operated by a load from the buried object. 7. The open / close type traverse device according to claim 5, wherein the connecting member constituting the safety device is a tubular member externally fitted to a connecting portion between the traverse beam elements.