JPS6310250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an earth retaining method for preventing landslides on the inner walls of trenches excavated for burying water pipes, sewer pipes, gas pipes, electric wires, telephone cables, etc.

Conventionally, in order to prevent landslides on the inner wall of the excavated trench, earth retention shoring has been widely used, in which sheet piles are erected on the inside wall of the excavated trench, and the opposing sheet piles are erected and strut beams are stretched. However, since this earth retaining shoring is carried out by workers inside the excavated trench, it is extremely dangerous if the inner wall of the excavated trench were to cause a landslide during the work.

For this reason, recently, an earth retention shoring device disclosed in Japanese Utility Model Application Publication No. 56-25744 was developed that uses sheet piles and can be constructed without requiring workers to enter the excavated trench.

As shown in Fig. 1, this earth retention shoring device consists of guide rails 1 that are erected at required intervals along both sides of an excavation trench, and guide rails 1 that are adjacent to each other on both sides of the excavation trench.
A rectangular frame-shaped guide frame 2 fitted vertically and slidably in between, and a plurality of sheet piles whose longitudinal side edges are slidably engaged with each other so as to sink using the outer surface side of each guide frame 2 as a guide. 3 and a spindle 4 that connects the guide rails 1 facing each other in the groove width direction.
and a support frame 5 which prevents the sheet pile 3 from separating outward from the guide frame 2, which is provided on the outer upper part of the guide frame 2.

Such an earth retaining support device connects opposing guide rails 1 in advance with a spindle 4, and then suspends them using a crane or the like at predetermined intervals in the longitudinal direction of an excavated trench. The rectangular frame-shaped guide frame 2 is suspended and fitted between the guide rails 1 adjacent to each other on the wall using a crane or the like, and then a plurality of sheet piles 3 are sequentially attached to the longitudinal side edges of the rectangular frame-shaped guide frame 2 through the support frame 5 on the outside upper part. It is installed by engaging the parts.

However, with this earth retention shoring device, the guide rail 1 must be set on site after accurately measuring the distance in the longitudinal direction of the excavated trench.
Workability is poor, and the construction efficiency of earth retaining shoring does not improve as much as expected. In addition, this earth retention shoring device has a complicated structure and has many parts.
The cost is high.

The present invention was made to solve this problem, and consists of sequentially setting a belt-shaped guide panel having a frame into which the lightweight steel sheet piles are inserted and the lightweight steel sheet piles in the longitudinal direction of the inner wall of the excavation trench. The purpose is to provide an earth retaining method for excavated trenches.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The earth retaining method for an excavated trench according to the present invention will be explained below using figures.

First, each member for constructing the earth retaining method of the present invention will be explained with reference to FIG. 2. Reference numeral 10 is a band-shaped guide panel, and the inner surface thereof is made of square pipe (or channel material) between the upper and lower crossbars 11. A plurality of vertical rods 12 made of rectangular pipes (or channel materials), five in this example, are provided at regular intervals in the longitudinal direction, and a pin hole 13 is provided in the side surface of each vertical rod 12. The upper side rail 11 of this guide panel 10
An angle member 14 is fixed in the upper longitudinal direction, and a lifting plate 16 having a round hole 15 is fixed on the angle member 14 at the position of the vertical beam 12. A frame 17 is fixed to the back of the guide panel 10, and the outer plate of the frame 17 is made of a corrugated steel plate 18, and a plurality of reinforcing plates, five in this example, are arranged at regular intervals in the longitudinal direction of the frame 17. 19 is fixed and frame 1
7 are divided. A hydraulic jack 20 connects the opposing guide panels 10, and a connector 22 having pin holes 21 is fixed at both ends.
23 is the pin hole 21 of the connector 22 of the hydraulic jack 20 and the pin hole 13 of the vertical rail 12 of the guide panel 10.
This is a pin that is inserted into the 24 is guide panel 1
A lightweight steel sheet pile 25 is inserted into the frame 17 of 0, and 25 is a foot chain for suspending the guide panel 10 from the upper end of the lightweight steel sheet pile 24 which is press-fitted into the trench bottom. 26 is a large drum otoshi that is applied to the lower part of the lightweight steel sheet pile 24 that has been erected, and 27 is a large drum ochi 2.
A hydraulic jack is used as a strut extending between 6 spaces, and a connector 28 connected to a large drum drop 26 is fixedly installed at both ends of the jack.

Next, the earth retaining method of the present invention using the above-mentioned members will be explained with reference to FIGS. 3a to 3d. Prior to trench excavation, the guide panels 10 are faced to each other, and the connectors 22 at both ends of the hydraulic jack 20 are connected to the guide panel 1.
0 and pin holes 2 on both ends.
A pin 23 is inserted through 1 and 13 to couple the hydraulic jack 20 to the opposing guide panel 10, and the hydraulic jack 20 is expanded and contracted appropriately to match the width of the groove to be excavated.

Now, as shown in Fig. 3a, once groove A has been excavated to a predetermined depth with a backhoe, the facing guide panels 10 connected with hydraulic jacks 20 are lifted onto the upper part of the inner wall of the end of groove A. The suspension rope W is moored to the round hole 15 of the plate 16, and is lowered by a crane or the like and held as it is. Next, a lightweight steel sheet pile 24 is inserted into the frame 17 on the back side of the guide panel 10 as shown in FIG. Next, the lifting plates 16 at both ends of the guide panel 10 are placed opposite each other.
As shown in FIG. 3c, the base end of the hook chain 25 is anchored to the round hole 15 of the guide panel 10, and the hook _25a is engaged with the upper end of the lightweight steel sheet pile 24, so that the guide panel 10 is suspended from the lightweight steel sheet pile 24. Next, as shown in the figure, earth and sand 30 are placed in the gap between the lightweight steel sheet pile 24 and the inner wall of the excavated trench A.
backfill. Next, the hydraulic jack 20 is extended and the lightweight steel sheet piles 24 facing each other are stretched. Then, if necessary, as shown in FIG. 3d, a large drum otoshi 26 is applied to the lower part of the lightweight steel sheet piles 24 which are facing each other, and a hydraulic jack 27 as a strut is connected to the large drum otoshi 26 by connecting connectors 28 at both ends. The lightweight steel sheet pile 24 and the guide panel 10, which are opposed to each other, are stabilized by locking and extending the hydraulic jack 27.
Thereafter, the above steps are repeated as the trench A is excavated.

In this way, the gas pipe P etc. can be suspended and laid at the bottom of the excavation bottom A.

As described above, in the earth retaining method of the present invention, the guide panel 10 facing the upper part of the inner wall of the excavated trench A is suspended by a crane or the like, and the guide panel 10 is suspended within the frame 17 on the back side of the guide panel 10. Insert the lightweight steel sheet pile 24 and press fit it into the groove bottom, and then insert the guide panel 10.
The guide panels 10 can be connected and arranged one after another without taking any set intervals, and the light steel sheet piles 24 can be set with guide rails and guide frames as in the past. Unlike the case where the guide panel 10 is installed through the support frame of the guide frame, it can be inserted into the frame 17 of the guide panel 10 immediately after the guide panel 10 is set. improve. Furthermore, since the work can be carried out on the ground, there is no need for the worker to enter the excavation trench A, making it safe. In addition, when constructing a cut beam by raising the lower part of the lightweight steel sheet pile 24 that has been erected and faces each other as necessary, the lightweight steel sheet pile 24 has already been press-fitted into the bottom of the excavation trench A, and the lightweight steel sheet pile 24 is 24 and the guide panel 10 are firmly supported by the hydraulic jack 20, so it is safe for the worker to enter the excavation trench A and work there.

Furthermore, in the earth retaining method of the present invention, even if a pipe C that crosses the excavated trench A is laid, the depth of the light steel sheet pile 24 in that part is made shallow to avoid the pipe C crossing the excavated trench A. Therefore, construction can be carried out without any problems.

As detailed above, the earth retaining method of the present invention has good workability, and since the work is carried out on the ground, the construction is efficient and safe.Also, even if there is a cross pipe in the excavation trench, it can be constructed without any problem. The structure is simple with fewer parts used, so each part can be assembled,
It has the benefits of easy dismantling and easy construction management.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional excavated trench earth retaining support device, Fig. 2 is a perspective view showing each member used in the excavated trench earth retaining method of the present invention, and Fig. 3 a to d are the earth retaining method of the present invention. Fig. 4 is a perspective view showing the construction process of the earth retaining method when the excavated trench has a cross pipe. 10... Band-shaped guide panel, 11... Yokoban,
12... Vertical beam, 13... Pin hole, 14... Angle material, 15... Round hole, 16... Lifting plate, 17... Frame, 18... Corrugated steel plate, 19... Reinforcement plate, 20... ...Hydraulic jack, 21...Pin hole,
22... Connector, 24... Light steel sheet pile, 25...
...Futsukuchain, 26...Otsuzumi Otoshi, 27...
Water pressure jack, 28... Connector, 30... Backfilling earth and sand, A... Excavation trench, P... Gas pipe, etc., C...
...transverse pipe.

Claims (1)

[Claims] 1. A band-shaped guide panel that is connected to the inner wall of a trench excavated to a predetermined depth and facing each other with a hydraulic jack is suspended using a crane, etc., and then a lightweight steel sheet pile is placed inside the frame on the back of the guide panel. Then, both ends of the band-shaped guide panels facing each other are suspended from the upper end of the lightweight steel sheet pile using a foot chain, and then backfilling is performed between the lightweight steel sheet pile and the excavated groove. An earth retaining method for excavated trenches in which the hydraulic jacks are extended, the lightweight steel sheet piles facing each other are stretched, and the process is repeated as the excavated trench progresses.