JP3353200B2 - Earth retaining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining method, and more particularly to an earth retaining method applied to give a prestress against a soil water pressure to a horizontally rigid earth retaining wall, for example, a continuous underground wall. is there.

[0002]

2. Description of the Related Art In a conventional earth retaining method, as shown in FIG. 10A, after the construction of a pair of earth retaining walls 1 is completed, a ground 2 extending between the earth retaining walls 1 and 1 is entirely excavated, as shown in FIG. 10B. 3 and cutting beam 4 extending in the vertical and horizontal directions in the horizontal plane
A soil retaining support is constructed to hold the retaining wall 1, and then the ground 2 is further excavated as shown in FIG. 10C. Subsequent erection of the earth retaining structure was being carried out afterwards.

[0003]

However, in the above-mentioned conventional method, a soil retaining structure is installed every time the ground 2 is excavated to a predetermined depth. Increases, allowing the occurrence of stress and deformation, and the retaining wall is displaced inward as shown in FIG.
The soil on the side of the ground, which should fill the deformed space, moved toward the deformed part, causing land subsidence on the ground surface.

[0004] For this reason, it was necessary to make the retaining wall large in rigidity. However, there were disadvantages that the wall thickness became large, it became economically expensive, and the land occupied area became large.

[0005] In addition, when the ground is particularly soft, there is a method of performing ground improvement such as injection of a chemical solution. However, since the ground improvement is extremely expensive, the entire excavated ground cannot be improved. As shown in the drawing, the preceding underground beam 5 had to be constructed only in a part, and large stress and deformation occurred in the retaining wall 1 in the portion without the preceding underground beam 5.

An object of the present invention is to eliminate the above-mentioned disadvantages.

[0007]

The earth retaining method of the present invention comprises:
Construct a pair of retaining walls, excavate a narrow groove extending vertically in the ground existing between the pair of retaining walls, in the groove, apply a predetermined tension between the pair of retaining walls, A pair of upsets, a girder inserted between the pair of upsets via a hydraulic jack, a tension detector for the girder, and a soil retaining structure device including a tension control system, and the tension detector giving a predetermined tension between a raised the pair of belly through the Setsuhari by the hydraulic jack in response to more outputs, to the excavating the pair of earth retaining walls while maintaining the predetermined tension force It is characterized by.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1 and FIG. 2, each of the vertical (depth) along the left and right retaining walls 1, 1 having high rigidity, such as a continuous underground wall (continuous wall). Direction)), and a plurality of cutting beams horizontally arranged via hydraulic jacks 7 with a certain vertical interval between the left and right side uplifts 6,6. 8
And a tension detector (not shown) for detecting the tension of the girder 8 and a tension control system 9 for operating the hydraulic jack 7 to equalize the tension of the girder 8 to a predetermined value. Is configured.

Reference numeral 11 denotes a hydraulic hose connecting the hydraulic jack 7 and the tension control system 9.

In the earth retaining method of the present invention, as shown in FIG. 3, after the construction of the earth retaining walls 1 and 1 is completed, prior to the main excavation of the ground 2 between the earth retaining walls 1 and 1, the trench for the continuous wall is excavated. A narrow groove 12 extending between the retaining walls 1 and 1 is excavated to a predetermined depth in the ground 2 by a machine, and the soil retaining structure device 10 is inserted into the groove 12 from above the ground 2.

After the earth retaining frame device 10 is inserted, the hydraulic jack 7 is operated by the tension control system 9 so that the shear beam tension expected to be applied when the excavation is completed is applied to the pair of shear beams via the respective shear beams 8. After that, the groove 12 is filled or solidified with sand or the like.

The above-mentioned groove 12 is provided at other portions of the ground 2 at a predetermined interval as necessary, and similarly,
Is inserted, tension is applied between the retaining walls 1 and 1 via the cutting beams 8, and the soil is filled with sand or the like.

After all the trenches 12 are filled with sand or the like, main excavation is performed for each step of the cutting beam 8 while the earth retaining structure device 10 is filled, and the cutting beam 8 of each step is provided for each step. The tension control system 9 adjusts the tension of the ground by the tension detector so that the tension is adjusted to the magnitude of the tension on the side surface of the ground while maintaining the ideal soil retaining state.

When the final excavation is completed, construction is performed according to the conventional method.

In addition, an inclinometer is installed on the belly 6 as needed, and the deformation of the retaining wall 1 is measured, and the tension control system 9 adjusts the cutting beam tension while grasping the stress state of the retaining wall. Thus, the distribution of the earth pressure acting on the retaining wall 1 can be made uniform, the required rigidity of the retaining wall 1 can be reduced (two inexpensive), and the amount of deflection of the wall can be minimized.

Further, depending on the ground conditions, the groove 12 may be formed to a position deeper than the surface with the final floor, and the earth retaining structure device 10 may be inserted into this.

FIGS. 4 and 5 show another embodiment of the earth retaining structure apparatus according to the present invention. In this embodiment, a plurality of intermediate piles 13 extending in the vertical direction are fixed to the cutting beam 8.

According to this embodiment, the required strength of the earth retaining frame device 10 can be ensured even when the length of the cutting beam 8 becomes long.

In order to cope with only the increase in the length of the groove 12, as shown in FIG. Stability can also be achieved. In addition, this pile can also be partially used as the intermediate pile 13.

As shown in FIG. 7, during the main excavation, in addition to the above-mentioned earth retaining structure device 10, the construction may be carried out while additionally erectionally extending a belly 3 extending horizontally in the earth retaining wall 1 as in the prior art.

Further, since the vertical position of the cutting beam 8 can be freely changed, as shown in FIG. 8, for example, the bulltozer 15 or the like can be arranged in a convenient manner for excavation.
As shown in FIG. 9, the space 1 where the train enters and the underground passage 1
6 and the like can be arranged conveniently for building structures.

[0023]

According to the earth retaining structure apparatus and the earth retaining method of the present invention, there are various advantages as described below.

(1) The displacement of the retaining wall can be suppressed to an extremely small amount.

(2) In the case of the conventional construction method, it is necessary to determine the cross-sectional performance of each member of the earth retaining work in a state immediately before installing the cutting beam (a large stress state generated in a very short time). According to this, the cutting beams for each step can be set in advance in a well planned manner.
It is not necessary to cover the short-term abnormal condition immediately before the installation of the girder.Therefore, the wall thickness of the retaining wall can be made thinner than the conventional method, and the embedding of the wall can be shortened. it can.

(3) The use of a measuring device capable of grasping the stress and displacement state of the earth retaining work can be applied while adjusting the tension of the girder prior to the main excavation, so that the soil water pressure acting on the earth retaining wall can be equalized. Therefore, the rigidity of the retaining wall can be made smaller (the wall thickness is smaller) than in the conventional method, and the retaining wall can have an economical cross section.

(4) The installation work (jumping and forging work) of earth retaining supports can be performed on the road. Therefore,

The work of skipping and blacksmithing, which is performed at each excavation stage, can be carried out at once, and the work of the blacksmith can be carried out at one time.

Also, as in the conventional method, it is dark, narrow,
Since work is not performed on a pile with poor scaffolding, work efficiency is high and work safety is high.

Further, the excavation work is not interrupted by the conventional earth retaining support installation work, so that the work is continued and the work efficiency is improved.

Further, since the work space is before the digging work is performed, a wide space for the entire excavation space can be used, and the work efficiency is improved.

[0032] Therefore, the steps of excavation and earth retaining support installation can be shortened by these things. In addition, work can be performed locally.

(5) Further, since the belly is installed in the vertical direction, the earth retaining support can be installed before the main excavation.

(6) Since the horizontal and vertical positions of the cutting beams can be freely changed, each work can be performed efficiently.

(7) When removing the girder at the time of constructing the structure, the uprighting can also be used in the vertical direction, so that the girder reshuffling work becomes easy.

(8) Lastly, it is possible to collectively pull out and remove like a pile, and the work for removing and raising the belly is simple and efficient.

[Brief description of the drawings]

FIG. 1 is an explanatory front view of an earth retaining frame apparatus to which the present invention is applied .

2 is an enlarged front view of a portion of the earth retaining Frames apparatus shown in FIG.

FIG. 3 is an explanatory plan view of the earth retaining structure device shown in FIG . 1 ;

FIG. 4 is a partially enlarged front view showing another embodiment of the earth retaining structure apparatus shown in FIG . 1 ;

FIG. 5 is an explanatory side view showing another embodiment of the earth retaining structure apparatus shown in FIG . 1 ;

FIG. 6 is an explanatory plan view showing still another embodiment of the earth retaining frame apparatus shown in FIG . 1 .

FIG. 7 is an explanatory plan view showing still another embodiment of the earth retaining frame apparatus shown in FIG . 1 .

FIG. 8 is an explanatory front view of the present invention.

FIG. 9 is an explanatory front view showing another example of the present invention.

FIG. 10A is a front view for explaining a conventional earth retaining method.

FIG. 10B is a front view for explaining a conventional earth retaining method.

FIG. 10C is a front view for explaining a conventional earth retaining method.

FIG. 11 is an explanatory front view of a conventional earth retaining structure device.

FIG. 12 is an explanatory front view of a conventional earth retaining structure device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soil retaining wall 2 Ground pile 3 Uplift 4 Cut beam 5 Underground beam 6 Piled uplift 7 Hydraulic jack 8 Cut beam 9 Control system 10 Soil retaining structure device 11 Hydraulic hose 12 Groove 13 Middle pile 14 Collapse prevention pile 15 Bulldozer 16 space

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 17/04 E02D 17/08

Claims (1)

(57) [Claims] 1. A pair of retaining walls are constructed, and a narrow groove extending vertically is excavated in a ground existing between the pair of retaining walls, and a predetermined groove is formed between the pair of retaining walls in the groove. A pair of belly upsets, a girder inserted through a hydraulic jack between the pair of uprights, and a tension detector for the girder,
Inserting a soil retaining structure device comprising a tension control system, applying a predetermined tension between the pair of belly uprights via the cutting beam by the hydraulic jack in response to the output from the tension detector, retaining method characterized by the excavating the pair of earth retaining walls while maintaining the tension force.