JP2000226851A - Strut rod device for earth retaining panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strut rod device for earth retaining panels capable of stably finely adjusting the axial directional length, easy in operation even if the earth retaining panels are put under earth pressure and safely and easily contractible for turning/retreating to a position running along the groove excavating earth retaining panels when a buried pipe is lowered. SOLUTION: A strut rod device 1 of earth retaining panels 3, 3 erected on both sides of an excavating groove are provided with a turning support part 8 for supporting the strut rod device 1 on one end so as to be turnable, connecting devices 7 arranged in both end parts of the strut rod device 1, a hydraulic cylinder 5 being an axial directional extensible/contractible means of the strut rod device 1 and a threadedly engaging extensible/contracible device 6. Then, when removing fluid pressure inside of the hydraulic cylinder 5, a compression spring 12 inside of the hydraulic cylinder 5 automatically contracts the hydraulic cylinder 5 to shorten the strut rod device 1. The threadedly engaging extensible/contractible device 9 can easily adjust the length of the strut rod device 1 at assembling/disassembling time of the earth retaining panels 3, 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a girder rod device provided to support a retaining panel erected along both sides of a trench to be excavated so as to resist the earth pressure.
The present invention relates to improvement of the expansion / contraction means.

[0002]

2. Description of the Related Art Conventionally, for example, when a buried object such as a sewer pipe is buried in the ground, the ground is excavated to form an excavation trench, and soil on both sides of the excavation and after excavation falls into the excavation trench. In order to prevent this, a plurality of retaining panels are erected along both sides of the excavation trench. In addition, the earth retaining panel,
It sinks with the excavation of the ditch. Here, in order to prevent these standing earth panels from falling into the inside of the excavation trench due to earth pressure during the excavation work, cutting beam rods are provided in the lateral direction between the earth panels on both sides. When the buried pipe, for example, a sewer pipe, is lowered into the excavation groove, the cutting beam rod becomes an obstacle, so the fluid pressure type telescopic device (hydraulic cylinder) provided on the cutting beam rod contracts the cutting beam rod. One end of the cutting beam rod is detached from one of the retaining panels, and the cutting beam rod is turned around a pin of a pivotable support provided near the other end of the cutting beam connected to the retaining panel. Is turned in a direction parallel to the direction of rotation.

[0003]

By the way, in the prior art girder rods, a system using only a hydraulic cylinder or a system using only a screw-in telescopic device such as a turnbuckle is used for its expansion and contraction. . However, in the method using only the hydraulic cylinder, the cylinder continues to expand while the pressure in the hydraulic cylinder is strong, and the hydraulic cylinder stably resists compression while there is internal pressure. When the internal pressure is removed to cause contraction, the contraction operation becomes unstable. For this reason, it is difficult to fine-tune the length of the cutting beam rod because the retaining panels on both sides are connected by the cutting beam rod in accordance with the groove width. Also, it is difficult to stably connect both ends of the. Furthermore, as described above, it is difficult to easily perform the work of contracting and turning the cutting beam rod to lower the buried pipe into the excavation groove.

[0004] On the other hand, in the system using only the screwing extension device, the length of the cutting beam rod can be finely adjusted, and the length of the cutting beam rod can be adjusted in accordance with the groove width. There is an advantage that it is easy to attach / detach to / from the panel or the guide rail for the retaining panel, but it is not easy to extend and retract the screwing extension device when earth pressure is applied to the retaining panels on both sides, and moreover, perform this extending and retracting operation. It is dangerous because the work must be carried out by workers entering the trench during excavation. The same problem also occurs in the case of contracting and turning the cutting beam rod for lowering the buried pipe into the excavation groove.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to combine a fluid pressure cylinder system and a screwing expansion / contraction system so that the disadvantages of both systems can be compensated for and the desired length can be achieved. Easy to fine-adjust the length, easy to expand and contract even under the condition of earth pressure, stable expansion and contraction operation, and easy to turn as described above. To provide.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems in the prior art, a cutting beam rod device for a retaining panel according to the present invention comprises:
A pivoting support portion that pivotally supports the cutting beam rod device at one end thereof; a coupling device at both ends of the cutting beam rod device, which detachably connects it to the retaining panel; and an axial direction of the cutting beam rod device. A fluid-type telescopic device constituting a telescopic means,
A hydraulically expanding and contracting device, wherein the hydraulically expanding and contracting device is configured to contract when fluid pressure is removed.

[0007] The fluid-type telescopic device may be a fluid-pressure cylinder, and a spring for storing a force for urging the cylinder in a contraction direction when the cylinder is extended by the introduction of fluid pressure may be provided inside the fluid-pressure cylinder.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of a cutting beam rod device for a retaining panel according to the present invention. FIG.

[0009] As shown in FIG.
Earth retaining panels standing along both sides of the trench 2 to be excavated 3,
3 is erected in the lateral direction as a strut. As shown in FIG. 2, the cutting beam rod device 1 includes a rod 4, a hydraulic cylinder 5 as a fluid-type telescopic device, a screw device 6 as a screw-type telescopic device, two connecting devices 7 at both ends, and a swing support. A part 8.

The rod 4 is made of a pipe material. One end of the rod 4 is connected to a hydraulic cylinder 5 and the other end is connected to a screw device 6 in a longitudinal direction. One connecting device 7 is fixed to the outer end of the hydraulic cylinder 5, and the other connecting device 7 is fixed to the outer end of the screw device 6 via the turning support 8.

As shown in FIGS. 1 and 2, the hydraulic cylinder 5 is connected between one end of the rod 4 and one connecting device 7, and includes a cylinder 9, a piston 10, a piston rod 11, a spring 12 And a bush 13.

A cylinder head 14 is screwed to the inner end of the cylinder 9. A space 15 is formed on the axis of the cylinder head 14, and a flow path 16 is formed orthogonal to the space 15, and water flows into the space 15 in the flow path 16. A swivel joint 17 for inflow and outflow from the space 15 is fixed. The swivel joint 17 is connected via a pipe 21 to a water pressure source (not shown). A bush 13 is fixed to the outer end of the cylinder 9 to close a chamber in the cylinder 9.

The outer diameter of the piston 10 is set to the inner diameter of the cylinder 9, and a disk-shaped piston ring 18 is fixed to the piston rod 11 to be described later via the piston 10 by a bolt 19 in the axial direction. A packing 20 is fitted in the groove on the outer peripheral surface.

The piston rod 11 has a smaller diameter than the inner diameter of the cylinder 9, and the piston ring 18 and the piston 10 are fixed to the inner end thereof by bolts 19, and the other end is radially insertable and removable. Connecting device 7 via pin 21
Is fixed.

The flange portion 22 of the bush 13 is fitted and fixed to the outer diameter portion 23 of the cylinder 9, and the outer surface 25 of the piston rod 11 is in sliding contact with the hole 24. The spring 12 is a coil spring.
And the outer peripheral surface 25 of the piston rod 11, and
It is inserted between the piston 10 and the bush 13 in a compressed state.

The screw device 6 includes a male thread pipe 27, a male thread tip rod 28, a rotating part 30 with a female thread, and the like.

The male thread pipe 27 has a predetermined length, and a male thread tip rod 28 is inserted and fixed to the inner surface of its outer end. The external thread 31 is formed over the entire length of the outer surface of the external thread pipe 27. On the other hand, the inner end of the male thread pipe 27 is in contact with the cylinder head 14. The male screw tip rod 28 has a cylindrical concave portion 33 formed at the outer end thereof in the axial direction. And male screw tip rod 2
8 is provided with a pin hole 34 extending in a radial direction orthogonal to the cylindrical concave portion 33.

A flange 14a is formed on the side of the cylinder head 14 opposite to the hydraulic cylinder 5, and a support pipe 35 is fixed inside the flange 14a by screwing.

Reference numeral 29 denotes an extension pipe used in accordance with the interval between the retaining panels 3 and 3, to which a support pipe 32 of the rotating section 30 having the female thread is fixed. The support pipe 35, the extension pipe 29, and the support pipe 32 are integrated with each other by welding. On the inner surface of the rotating pipe 30 with the female thread, a female thread 36 to be screwed to the male thread 31 of the male thread pipe 27 is formed. The inner end of the female threaded rotary pipe 30 is fixed to a half-rotatable cylindrical rotary cover 38, and the rotary cover 38 rotatably engages with the annular projection and the annular groove on the outer peripheral surface of the support pipe 32. ing. At the outer peripheral surface of the female threaded rotary pipe 30, for example, three wrench holes 37 are formed at intervals in the circumferential direction.

The connecting device 7 is of a known type, and includes a hydraulic cylinder-side connecting device 7a and a screw device-side connecting device 7b. The head member 40, the sleeve member 41,
A contact member 42 and a cotter 43 are provided. The head member 40 has a T-shaped head 45 formed integrally with the main body 44 at an outer end portion of a cylindrical main body 44, and a cotter hole 46 is formed in the main body 44 so as to have a diameter perpendicular to the axis. It is pierced in the direction. The sleeve member 41 has a cylindrical shape, and an annular outer flange 47 is formed at an outer end thereof.
7, a cotter hole 48 is provided in the radial direction. A ring-shaped contact member 42 made of a rubber material is fixed to the flange 47 on the side opposite to the cotter hole. By inserting the cotter 43 into the cotter holes 46 and 48, the head member 40 is prevented from falling out of the sleeve member 41.

The turning support portion 8 includes a U-shaped turning member 50 and two vertical pins 51 as shown in FIGS. And the turning member 50 is
1 is fixed to the sleeve member 41 of the connecting device 7 (7b), and when one pin 51 is removed, the other pin 51
Is used as a vertical rotation axis so that the cutting beam rod device 1 can be turned horizontally in a required direction.

As shown in FIG. 1, in order to assemble the cutting beam rod device 1 to the retaining panels 3 and 3 (the guide rail 52 thereof), pressurized water is supplied into the hydraulic cylinder 5 through the swivel joint 17 and the piston 10 Is displaced to the right in FIG.
Is moved to the connecting device 7 (7a) side while being compressed. Thereby, the hydraulic cylinder 5 is extended until the cutting beam rod device 1 extends to a length close to a predetermined interval between the retaining panels 3. After closing the hydraulic cylinder 5 while maintaining the hydraulic pressure in the hydraulic cylinder 5, a tool such as a wrench is inserted into the concave hole 37 of the screw device 6, and the rotary pipe 30 with internal threads is rotated. At this time, the rotating cover 38 rotates together with the rotating pipe 30 around the support pipe 32. Therefore, even if there is a difference in the extension amount of the hydraulic cylinder 5, the rotation of the rotary pipe 30 causes the external thread pipe 27 screwed therewith to advance and retreat in the axial direction, and the length of the screw device 6 is adjusted to a predetermined value. The total length of the cutting beam rod device 1 is set so as to have a predetermined size suitable for the groove width.

Next, for example, an elongated window hole 53 of (the guide rail 52 of) the earth retaining panels 3, 3 erected on the ground surface.
(FIG. 4) The connecting devices 7 (7
After inserting the T-shaped heads 45a, 7b) from the inside to the outside of the groove as shown in FIG. As a result, the T-shaped head 45 does not fall out of the window 53 due to the principle of bayonet coupling, and the cutting beam rod device 1 is connected and mounted between the retaining panels 3. The window 53 may be provided in the panel 3 itself as shown by a virtual line in FIG. Such a retaining panel 3,
The assembly of 3 is made possible on the ground by the ease and stability of the length adjustment of the girder rod device 1. The same applies to decomposition.

Next, the operation of the girder rod device 1 when a sewer pipe or the like is inserted into the bottom of the groove 2 from above will be described.

First, the pin 21 between the hydraulic cylinder 5 of the cutting beam rod device 1 and the connecting device 7 (7a), which is stretched between the retaining panels 3 and 3 under earth pressure, is pulled out to remove the cutting beam rod device. When the hydraulic cylinder 5 is released in a cantilevered state and the hydraulic pressure of the hydraulic cylinder 5 is released, the piston rod 1
1 stably retreats toward the screw device 6 (to the left in FIG. 2). Therefore, it is not necessary to rotate the screwing extension device 6 against the earth pressure or to reduce the earth pressure, and it is not necessary for the worker to get down into the excavation groove and work at risk. By the stable contraction of the hydraulic cylinder 5, the cutting beam rod device 1 itself automatically contracts. Then, one of the two pins 51 of the turning support portion 8 is removed, and the cutting beam rod device 1 is turned by using the remaining pin 51 as a rotation axis so as to be parallel to the longitudinal direction of the excavation groove 2, so that cutting is performed. When the beam rod device 1 is retracted, a sewer pipe or the like can be lowered into the groove 2 from above the groove 2.

In the present embodiment, the fluid expansion and contraction device is
Although a hydraulic cylinder is used, a hydraulic cylinder may be used.

[0027]

As described above, the cutting beam rod device for a retaining panel according to the present invention has a swivel support portion that supports it at one end so as to be able to swivel. Can be turned. And since the connection device is provided at the end of the cutting beam rod device, the connection of the cutting beam rod device to the retaining panel or its guide rail can be reliably performed. Further, the girder rod device has a hydraulic expansion / contraction device that constitutes an expansion / contraction device in the axial direction, and a screwing expansion / contraction device. The telescopic device is automatically contracted to enable the turning of the cutting beam rod without reducing the earth pressure on the retaining panel. Also, when assembling and disassembling the retaining panel, the cutting beam rod device is engaged with the threaded telescopic device. Can be adjusted by fine-tuning the length. Then, when lowering the buried pipe into the excavation trench, remove the connecting device on the side opposite to the swivel support part of the cutting beam rod device, and when the fluid of the fluid pressure type telescopic device is drained, it automatically contracts, so Even under pressure, the cutting beam rod device can be easily turned and retracted in the direction along the retaining panel. In addition, the threaded telescopic device allows for accurate adjustment of the length of the traversing rod device after the hydraulic telescopic device has been appropriately extended by the introduction of fluid. And, since the screwing extension device makes it possible to easily adjust the length of the girder rod device in accordance with the excavation width of the groove, it becomes possible to assemble the retaining panel on the ground surface.

[Brief description of the drawings]

FIG. 1 is a view in a longitudinal direction of a trench when a retaining panel is erected in a trench and a cutting beam rod device is mounted.

FIG. 2 is a sectional view of a cutting beam rod device.

FIG. 3 is an explanatory view showing a turning state of the cutting beam rod device.

FIG. 4 is an assembled perspective view of a retaining panel and a cutting beam rod device.

FIG. 5 is an exploded perspective view of a part of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 cutting beam rod device 5 fluid pressure type telescopic device (hydraulic cylinder) 6 screwed telescopic device (screw device) 7 (7a, 7b) coupling device 8 turning support part 9 cylinder 10 piston 11 piston rod 12 spring 13 bush 14 cylinder head 15 Vacuum 16 Flow path 27 Male thread pipe 28 Male thread tip rod 30 Female threaded rotary pipe 32 Bearing pipe 35 Support pipe 37 Recessed hole for rotary tool 38 Cylindrical rotary cover 40 Head member 41 Sleeve member 43 Cotta 44 Body 45 T-shaped head

Claims (2)

[Claims] 1. A cutting rod device of a retaining panel provided between a retaining panel erected along both sides of an excavation groove and provided so as to resist earth pressure. A pivoting support portion for supporting, a connecting device at both ends of the cutting beam device and detachably connecting it to the retaining panel, and a fluid pressure type expanding / contracting device constituting axial expansion / contraction means of the cutting beam device, With a screw extension device,
A hydraulic beam type telescopic device, wherein the hydraulic device is configured to contract when fluid pressure is removed. 2. The hydraulic expansion and contraction device according to claim 1, wherein the hydraulic expansion and contraction device is a hydraulic cylinder and has a spring therein for storing a force for urging the cylinder in a contracting direction when the cylinder is extended by the introduction of hydraulic pressure. The beam cutting device for a retaining panel according to claim 1.