JPH0310198Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to an earth retaining device for an excavation trench, and in particular, to prevent the trench wall excavated by an excavation device from collapsing, steel sheet piles are erected along the trench wall. In addition, we aim to improve efficiency and reduce the amount of materials used to interpose and fix the spacing member between the steel sheet piles in the trench width direction through the raised material, and also to reduce the amount of materials required for these tasks. All construction work can be done from the ground level without entering the building.

BACKGROUND TECHNOLOGY Generally, in construction work to bury telegraph, telephone lines, water, sewage, gas pipes, etc. underground, an open trench is excavated in advance, and the pipe is laid from above the trench to the bottom of the trench. Backfill the excavated soil and bury it. The width of the open groove
The trench walls are 60 to 90 cm wide and about 150 cm deep, but the walls of these trenches are often made of soil and are prone to collapse, making it dangerous for workers to work inside the trenches.
Earth retaining work will be carried out to prevent the ditch walls from collapsing. This earth retaining work involves driving and erecting steel sheet piles or planks along the trench walls, and then applying stripping materials to the steel sheet piles in the same direction, and adjusting the expansion and contraction in the trench width direction between the stripping materials. This was achieved by intervening and fixing spacing members (struts) such as flexible tubes. For this reason, many spacing members are used to sufficiently resist the earth pressure on the trench walls, so a large number of load-bearing materials exist in the trench in the trench width direction, and the conduit is laid at the bottom of the trench. Construction work to do so will also be extremely difficult.

Furthermore, in this type of construction, it is often prohibited for the construction owner (for example, Nippon Telegraph and Telephone Corporation, etc.) to allow workers to enter the trench to perform various tasks in order to prevent personal injury. In many cases, all cable burying work must be done from above the open trench.

Problems to be Solved by the Invention However, according to the above-mentioned conventional technology, steel sheet piles, etc. must be driven into at least the trench bottom to prevent the trench walls near the trench bottom from collapsing. It is necessary to hammer in the upper end of the steel sheet pile. Moreover, in order to prevent the driven steel sheet piles from collapsing and to resist a predetermined earth pressure, it is necessary to interpose and fix a large number of spacing members between the steel sheet piles via a raising member. Moreover, these operations must be performed from above the groove, that is, without a worker entering the groove, resulting in poor work efficiency. Even when a conduit with a cable inserted is laid at the bottom of the groove, many spacing members are interposed in the width direction of the groove, so the conduit laid in the longitudinal direction of the groove is inserted into the groove. However, the work of placing it on the bottom of the groove is troublesome and time-consuming. Of course,
Insertion of the pipe into the groove must also be carried out from above the groove. Therefore, cable burying work requires a lot of materials and complicated labor, and the work efficiency is low.
There were problems such as.

Means for Solving the Problems In order to solve the above problems, the present invention includes a pair of side members that are suspended and fixed to the upper end of a steel sheet pile erected along the trench wall of an excavation trench; a retractable member that connects the upper ends of the side members, a retractable spacing member below the retractable member that connects the lower ends of the side members, and an outer upper end and an inner lower end of the side members, respectively To provide an earth retaining device for an excavated trench, which comprises a supporting member provided therein and through which a raising member is inserted in a detachable manner.

Effects According to the above configuration of the present invention, the steel sheet pile is placed without being driven into the trench bottom, the side member is suspended and fixed to the upper end of the sheet pile, the raising member is attached, and the spacing member is operated. When the steel sheet piles are fixed in contact with the groove walls and the contraction members are operated to bring the upper ends of the side members closer to each other, the lower ends of the steel sheet piles are expanded and pressed toward the groove walls using the spacing member as a fulcrum. This eliminates the need to interpose a large number of spacing members near the groove bottom, making the groove space larger, making it easier to bury the pipe, and keeping the top and bottom of the raising material, contraction member, and spacing member Since the two pieces are integrally assembled to the side member, the reinforcing work to prevent the steel sheet piles from falling down is simple, quick, and easy.

Embodiments The present invention will be explained below based on illustrated embodiments.

Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a side view, Figs. 4 and 5 are a plan view and side view of the spacing member, and Fig. 6 is a cross section taken along line A-A in Fig. 2. Figure, 7th
The figure and FIG. 8 are a plan view of an excavated trench and a sectional view taken along the line B-B in FIG. 7, showing an example of use.

In FIGS. 1 to 6, 1 is a pair of left and right side members, 2 is a retractable member that is pivotally connected to the upper end of the side members 1 and 1, and 3 is the lower end of the side members 1 and 1. The spacing member is pivotably connected to and expandable and retractable, and these form a quadrilateral structure.

The side member 1 is a metal plate having a width smaller than the steel sheet pile 4 and a height of about 80 cm. The upper and lower ends of the metal plate are bent outward and inward, respectively, and the upper end is suspended from the upper end of the steel sheet pile 4. It has a hook part 1a to be lowered and a frame part 5 that can be connected to the hook part 1a to surround the steel sheet pile 4, and has a support part 6 on the outside of the frame part 5 through which a raising material 36 is inserted and fixed, Moreover, it has a support part 7 on the lower end on which another belly raising material 37 is placed and fixed.
The support portion 6 includes a pair of upper and lower overhang portions 6a, 6a that protrude outward from the frame portion 5, and an inverted U-shaped stop pin 6b that can be inserted and removed from above at the ends of the overhang portions 6a, 6a. The support portion 7 is provided on the inside of the side member 1, whereas the support portion 6 is provided on the outside of the side member 1, and therefore the raised members 36 and 37 are positioned to sandwich the steel sheet pile 4.

The shrinkable member 2 has a short tube 9 and an inner tube 10 pivotally connected to brackets 8, 8 fixed to the left and right side members 1, 1 at the height of the frame portion 5 by shaft pins 11, 11, respectively.
Outer tube 1 with this short tube 9 and inner tube 10 inserted into both ends
2, the short tube 9 and the outer tube 12 are connected and fixed by a pin 13, while the inner tube 10 and the outer tube 12 are engaged so as to be movable in the axial direction. That is, as shown in FIGS. 4 and 5, the inner tube 10 and the outer tube 12 each have pin holes 14 and 15 drilled in the diametrical direction at a certain distance, and the outer tube 12 has pin holes 14 and 15 formed in the diametrical direction. It has a long hole 16 in the same row as the pin hole 14. Pin hole 15 is pin hole 14
The pin holes 15 on either side match with any of the pin holes 14 whose position changes as the inner tube 10 slides, and the pin holes 17
can be inserted. A U-shaped metal fitting 18 is positioned in the elongated hole 16, sandwiching the outer tube 12, and a pin 19 is inserted through the elongated hole 16 from the metal fitting 18 into the pin hole 14 of the inner tube 10. This metal fitting 18
is provided with a protrusion 18a that protrudes laterally, and horizontal hydraulic drive device fixing parts 20, 20a that face at least the same line as the protrusion 18a are fixed to the side of the outer tube 12 in the form of wings. ing. The hydraulic drive device fixing portions 20, 20a have a recess 21 in which a simple hand-operated hydraulic pressure generating device and a small jack connected by a pressure oil pipe are placed and fixed. 11a,1
7a and 19a are chains for connecting pins.

In the spacing member 3, lid portions 23, 23 made of angle material, which constitute the support portion 7, are pivotally connected via shaft pins 24, 24 to brackets 22, 22 fixed to the left and right side members 1, 1. , and there is a ready-made screw-type jack 25 between these lid parts 23, 23.
are connected by pins 26 and 27. This screw type jack 25 is attached to the case 28 as shown in FIG.
, a shaft 29 that is inserted through the case 28 and can move back and forth in the axial direction, and a lock plate 3 that passes through the shaft 29 and is fixed to the case 28 via a lock spring 30.
1 and the lock plate 31, a drive spring 32 is interposed between the drive plate 33, which passes through the shaft 29 and is tiltable.
and a drive lever 34 that tilts the drive plate 33. When the drive lever 34 is repeatedly tilted back and forth, the drive plate 33 tilts and pushes the shaft 29 out of the case 28, while the drive lever 34 is tilted in the opposite direction as shown in the figure. If the shaft 29 is tilted in the direction and pressure is applied to the shaft 29, the shaft 29 will be pulled toward the case 28 side.

Next, an example of use of the above embodiment will be explained based on FIGS. 7 and 8. Steel sheet piles 4, 4 are inserted along both groove walls 35a, 35a of the groove 35, which has been excavated in advance to a predetermined width and depth with an excavator such as a backup, and the upper ends of the steel sheet piles 4, 4 are inserted from the groove 35. It is made to protrude at a predetermined height and is placed upright on the groove bottom 35b without driving the lower end into the groove bottom 35b.
When the steel sheet piles 4, 4 are erected for a predetermined length, for example, 3 to 4 m, closely spaced along the longitudinal direction of the groove 35 or along the groove walls 35a, 35a at a predetermined interval, the steel sheet piles 4, 4 located at both ends thereof are A retaining device is inserted between each pair of sheet piles 4, and the frame portions 5, 5 of the side members 1, 1 are fitted to the upper ends of the steel sheet piles 4, 4, respectively, and are hooked to the upper ends of the steel sheet piles 4, 4, respectively. The parts 1a, 1a are suspended and fixed. When the pair of earth retaining devices are suspended in the groove 35 at intervals of 3 to 4 m, the support members 6 and 7 facing each other in the longitudinal direction of the groove 35 are
6 and 37 respectively. This work is done in groove 35.
Do it from above. The steel sheet piles 4a in the intermediate portion are integrated with the steel sheet piles 4 by the raising members 36 and 37, making them difficult to fall down. Next, the spacing member 3 is operated to press the steel sheet piles 4, 4 on both sides against the groove walls 35a, 35a, thereby fixing the spacing. This operation is performed using drive lever 3.
4 is repeated back and forth, and the shaft 29 is made to protrude from the case 28 toward the side member 1 side. After the spacing member 3 is thus fixed between the steel sheet piles 4, 4, the upper end portions of the steel sheet piles 4, 4 are drawn closer to each other by operating the contraction member 2. In this operation, the jack 38 is placed and fixed on the hydraulic device fixing part 20 of the contraction member 2, and the operating rod 39 is brought into contact with the protrusion 19, so that pressure oil is supplied to the jack 38. In this case, the pin 17 connecting the inner tube 10 and the outer tube 12 is removed. Therefore, the operating rod 3 of the jack 38
9 moves, the protrusion 19 pulls the inner tube 10 along the elongated hole 16 to the left in FIG. The distance between the hooks 1a and 1a becomes narrower. Therefore, the removed pins 17 are inserted into the pin holes 14 and 15 to fix the outer tube 12 and the inner tube 10 in a non-expandable manner. That is, when the interval between the upper ends of the steel sheet piles 4, 4 is shortened, the interval between the lower ends of the steel sheet piles 4, 4 is expanded using the interval retaining member 3 as a fulcrum. As a result, the lower end portions of the steel sheet piles 4, 4 come into pressure contact with the groove wall 35a near the groove bottom 35b, so that a wide space inside the groove 35 can be maintained without intervening the spacing member 3 near the groove bottom 35b.

In order to remove the earth retaining device installed as described above, place the jack 38 of the retractable member 2 on the hydraulic device fixing part 20 in the same manner as in the above operation, and retract the retractable member 2 so that the pin 17 can be easily removed. After
When the pin 17 is removed, the contraction member 2 is expanded by the width-expanding force of the spacing member 3 and returns to its original length. On the other hand, the contraction member 2 can also be extended, and in this case, the jack 38 is placed and fixed on the hydraulic device fixing part 20a on the opposite side from the hydraulic device fixing part 20 in the opposite direction, and the jack 38 is The metal fitting 18 having the portion 18a is removed by removing the pin 19, the metal fitting 18 is clamped and fixed to the inner tube 10 through the pin hole 14, and the operating rod 39 of the jack 38 is applied to the protruding portion 19. Then, when pressure oil is supplied to the jack 38, the actuating rod 39 pushes the metal fitting 18 to the right in FIG. 6, so that the length of the contraction member 2 is expanded and can return to its original length. Next, push down the drive lever 34 of the spacing member 3 and move the shaft 29 to the case 2.
8 and remove the raising members 36 and 37, the entire earth retaining device can be removed upward from within the groove 35. Since the height of the side members 1, 1 is approximately 80 cm, such operations can be performed by the worker bending down and inserting his/her hand from above the groove 35. There is no need for staff to enter.

Effects of the invention According to the invention described above, there are provided a side member that is suspended and fixed to a steel sheet pile erected along the trench wall of an excavation trench, and a retractable member that is pivotally connected between the side members and is expandable and retractable. It is possible to obtain an earth retaining device that copes with the earth pressure applied to the steel sheet piles by using a quadrilateral structure consisting of a spacing member, and furthermore, by operating the contraction member to reduce the spacing between the upper ends of the steel sheet piles, the steel sheet piles can be The gap between the lower ends can be expanded and the pipe can be pressed against the groove wall, and there is no need to provide a spacing member at the bottom of the groove, allowing for extra space within the groove, making it possible to improve the efficiency of conduit embedding work. It is possible to reduce the amount of earth retaining materials. Moreover, since it is integrally constructed as an earth retaining device, there is no need to assemble it before use, and it can also be disassembled if necessary, making it convenient and easy to handle. Furthermore, by reducing the height of the side members, workers can put their hands into the groove from above the groove to operate the spacing member or contraction member, or install the lifting member, making it easier to carry out work within the premises. Earth retaining work can be carried out without the need for personnel to enter. Moreover, since the steel sheet piles can be placed and erected without driving them into the trench bottom, the work of erecting the steel sheet piles is simplified, which not only improves the work efficiency of earth retaining work, but also improves cable burying work, etc. This has the effect of improving work efficiency, etc.

[Brief explanation of the drawing]

Fig. 1 is a front view, Fig. 2 is a plan view, Fig. 3 is a side view, Figs. 4 and 5 are a plan view and side view of the spacing member, and Fig. 6 is a cross section taken along line A-A in Fig. 2. Figure, 7th
The figures and FIG. 8 are a plan view of an excavated groove and a sectional view taken along the line B-B in FIG. 7, showing an example of use. DESCRIPTION OF SYMBOLS 1... Side member, 1a... Hook part, 2... Contraction member, 3... Spacing member, 4... Steel sheet pile, 5...
Frame portion, 6, 7... Support portion, 10... Inner pipe, 12...
...outer tube, 14, 15... pin hole, 16... oblong hole,
18...Metal fitting, 20, 20a...Hydraulic device fixing part, 21...Recess, 25...Screw type jack, 2
8... Case, 29... Shaft, 30... Lock spring, 31... Lock plate, 32... Drive spring, 33... Drive plate, 34... Drive lever, 35
... Groove, 36, 37 ... Raising material, 38 ... Hydraulic device.

Claims (1)

[Scope of utility model registration request] A pair of side members that are suspended and fixed to the upper ends of steel sheet piles erected along the trench walls of an excavation trench, a contractable member that connects the upper ends of the side members and is expandable and contractible, and a lower part of the contractible members. The method is characterized in that it is comprised of an elastic spacing member that connects the lower ends of the side members, and support parts that are provided on the outer side of the upper end and the inner side of the lower end of the side member, and through which the belly-raising material is inserted in a detachable manner. Earth retaining device for excavated trenches.