JPH07896B2 - Construction method for underground wall - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a continuous wall in the ground.

[Conventional technology]

Conventionally, as a method of constructing a continuous wall in the ground,
As shown in the drawing, the preceding element groove 4 is excavated and formed in the ground 10 while being filled with the muddy water 5, and the steel preceding element 11 having a plurality of female joints 1 is formed into the muddy water in the preceding element groove 4. 5, the partition plate 12 extending in the up-down direction is fixed to both sides in the width direction of the partition plate 12 extending in the up-down direction to form a protection / reaction force member 14, and the protection / reaction force thereof is formed. Each male joint 13 of the member 14 is inserted into each female joint 1 of the preceding element 11, and a granular filler 15 such as gravel is filled between the partition plate 12 and the end of the groove 4 for the preceding element. Moreover, a partition member 16 is interposed between each female joint 1 and the side wall of the preceding element groove 4.

Next, as shown in FIG. 14, the muddy water between the leading element 11 and the side wall of the leading element groove 4 is solidified to form a solidified material layer.
After forming 17, as shown in FIG. 15, while excavating the groove 18 for the trailing element, the protective and reaction force member 14 and the partition member 16 are removed, as shown in FIG. 16, A construction method is known in which a plurality of male joints 13 of the steel trailing element 19 are inserted into the female joint 1 of the preceding element 11.

[Problems to be Solved by the Invention]

In the case of the conventional continuous wall construction method, a heavy weight protection / reaction member 14 and two partition members 16 are installed in a complicated structure, and then the preceding element 11 and the side wall of the preceding element groove 4 are installed. After the solidified material layer 17 is formed by injecting the muddy water solidifying material between the two, it is necessary to pull out and collect the heavy protection and reaction member 14 and the two partition members 16, so that the construction is complicated. Is. Further, since the protection and reaction force member 14 and the partition member 16 need to be manufactured, there is a problem that the construction cost becomes high.

It is an object of the present invention to provide a method for constructing a continuous underground wall that can advantageously solve the above problems.

[Means for Solving the Problems]

In order to achieve the above object, in the method for constructing an underground continuous wall of the present invention, the inside of the female joint 1 in the steel preceding element 2 including the female joint 1 having a partially cut-out circular cross section extending in the vertical direction. In the state where the flexible material tube 3 having the closed lower end is accommodated, the muddy water 5 in the groove 4 for the preceding element provided with the preceding joint element 2 in the ground
The tube 3 is brought into close contact with the inner peripheral surface of the female joint 1 by arranging it inside and injecting the liquid 6 into the tube 3 to expand it, and then between the groove 4 for the preceding element and the preceding element 2. After providing a solidifying material layer or granular filler in
The groove 8 for the trailing element is excavated, then the tube 3 is pulled out upward from the female joint 1, and the groove 8 for the trailing element is formed.
The steel trailing element 9 is inserted therein, and the trailing element 9 is directly or indirectly inserted and connected to the female joint 1 of the leading joint portion element 2.

〔Example〕

 The present invention will now be described in detail with reference to the illustrated example.

FIG. 10 shows a steel leading element 2 and a steel trailing element 9 used in an embodiment of the present invention, in which both widthwise ends of each flange in a steel element body 20 having an H-shaped cross section, The central portion in the circumferential direction of the steel female joint 1 having a partially cut circular section is fixed by welding.

FIG. 11 shows an example of the male male joint member 21 used in the embodiment of the present invention, in which the front opening 2 in each of the elements 2 and 9 is provided on both sides in the width direction of the strip-shaped plate member 22.
The engaging portion 25 having an arc cross section having a width wider than that of the rear opening 24 is integrally provided.

FIG. 12 shows another example of the steel male joint member 21 used in the embodiment of the present invention, in which H-section steel is used.

When constructing a continuous underground wall using the preceding element 2, the following element 9 and the male joint member 21 shown in FIG. 11, first, as shown in FIG. 1, while filling the muddy water 5,
After excavating and forming the groove 4 for the leading element in the ground 10, as shown in FIG. 2, the leading element 2A in which the flexible material tube 3 is inserted into the female joint 1 in the rear portion and the female joint 1 in the front portion The preceding element 2B having the tube 3 made of a flexible material inserted therein is inserted into the muddy water 5 in the groove 4 for the preceding element and built up, and the male joint member extends over the female joint 1 in each of the preceding elements 2A and 2B. 21 is inserted, and a liquid 6 such as water is injected into the tube 3 inserted in the female joint 1 at the front part of the leading element 2B, and the tube 3
Is expanded and brought into close contact with the inner peripheral surface of the female joint 1, and in this state, a granular filler 15 made of crushed stone or the like is filled between the leading element 2B and the end of the leading element groove 4. The tube 3 that is in close contact with the inner peripheral surface of the female joint 1 of the preceding element 2B is kept in a close contact state until the granular filler 15 is removed.

The tube 3 is arranged so as to extend over the entire length of the female joint 1, and the lower end portion of the tube 3 is closed and temporarily fixed to the female joint 1 with an adhesive tape or the like.

Next, as shown in FIG. 3, a liquid 6 such as water is injected into the tube 3 inserted into the female joint 1 of the preceding element 2A, the tube 3 is expanded, and the inner circumference of the female joint 1 is expanded. Adjacent to the surface, then adjacent preceding elements 2A, 2
Between the female joint 1 of B and the side wall of the groove 4 for the preceding element,
The mortar injection pipe 27 is arranged and each preceding element 2A, 2
A granular filler 15 is filled between the B and the groove 4 for the preceding element.

Next, while mortar is being injected from the mortar injection pipe 27, the mortar injection pipe 27 is pulled up to form a concrete outflow preventing mortar layer between the pair of adjacent female joints 1 and the side walls of the preceding element groove 4. .

Next, as shown in FIG. 4, adjacent preceding elements 2A, 2
The portion surrounded by B is filled with concrete to provide a solidifying material layer 7.

Next, as shown in FIG.
After excavating the groove 8A for the trailing element, the first trailing element 9A in which the tube 3 made of a flexible material is inserted and temporarily fixed in the female joint 1 at the rear is used for the first trailing element. It is inserted and built in the muddy water 5 in the groove 8A, and then, as shown in FIG. 6, a liquid 6 such as water is placed in the tube 3 inserted in the female joint 1 of the first trailing element 9A. Inject
The tube 3 is expanded and brought into close contact with the inner peripheral surface of the female joint 1.

Next, the mortar injection pipe 27 is arranged outside between the adjacent female joints 1 of the preceding element 2A and the first succeeding element 9A, and the first succeeding element 9A and the first succeeding element groove 8A. And the granular filler material 15 is filled between them.

Next, as shown in FIG. 7, the female joint 1 of the preceding element 2A
While inserting the male joint member 21 between the female joint 1 and the female joint 1 in the first trailing element 9A, and while injecting the mortar from the mortar injecting pipe 27, the mortar injecting pipe 27 is pulled up, and the pair of adjacent female joints 1 And a side wall of the groove for the element, a mortar layer for preventing concrete outflow is formed. Then the leading element 2A and the first trailing element 9A
The portion surrounded by and is filled with concrete to provide the solidifying material layer 7.

Similarly, as shown in FIG. 8, the second and subsequent trailing element grooves 8B are excavated, and the second and subsequent trailing elements 9B are installed and the male joint member 21 is inserted. The filling of the granular filler 15 and the formation of the solidified material layer 7 are repeated.

In the above embodiment, the adjacent leading element and trailing element are indirectly connected by the male joint member 21 inserted over the female joint 1, but as shown in FIG. Alternatively, the female joint 1 may be directly inserted with the male joint 26 provided on the other element to connect the respective elements. In addition, concrete filling and mortar injection pipes in the area surrounded by adjacent elements
The injection of mortar from 27 may be performed simultaneously.

The cross-sectional shape of the female joint 1 may be a substantially notched circular shape, for example, a partially notched ellipse. Further, in FIG. 2, the tube 3 inserted into the female joint 1 of the preceding element 2A is expanded by liquid injection and brought into close contact with the inner peripheral surface of the female joint 1, and the preceding element 2A and the preceding element groove The granular filler material 15 may be filled also between the ends of No. 4 and No. 4.

When carrying out the present invention, instead of the granular filler 15,
A low-strength mud solidifying material such as a water glass mud solidifying material or a cement mud solidifying material may be used.

〔The invention's effect〕

Since the present invention is configured as described above, it has the effects described below.

The preceding element 2 is arranged in the muddy water 5 in the groove 4 for the preceding element in a state in which the tube 3 made of a flexible material is previously arranged in the female joint 1 on the side of connecting the following element in the preceding element 2. Then, the liquid 6 is injected into the tube 3 to expand the tube 3 and bring the tube 3 into close contact with the inner peripheral surface of the female joint 1, and then the preceding element groove 4
After providing the solidifying material layer 7 or the granular filler between the first element 2 and the leading element 2, the groove 8 for the trailing element is excavated, and then the tube 3 is pulled out upward from the female joint 1 and for the trailing element. Since the steel trailing element 9 is inserted into the groove 8 and the trailing element 9 of the female joint 1 of the leading joint portion element 2 is directly or indirectly inserted and connected, the trailing element connection in the leading element 2 is performed. The expanded tube 3 can prevent the granular filler material 15 and the solidifying material from entering the female joint 1 on the side, and thus the partition plate 12 and the male joint 13 that have been conventionally used.
The underground continuous wall can be easily and quickly constructed without using the protective and reaction force member 14 and the two partition members 16.

[Brief description of drawings]

1 to 8 are cross-sectional plan views showing the construction sequence of the underground wall of the present invention, FIG. 9 is a cross-sectional plan view showing a state in which elements are directly inserted and connected, and FIG. 10 is an element with a female joint. FIG. 11 is a perspective view showing an example of the male joint member, and FIG. 12 is a perspective view showing another example of the male joint member. 13 to 16 are cross-sectional plan views showing the order of construction of conventional underground continuous walls. In the figure, 1 is a female joint, 2 is a leading element, 3 is a flexible material tube, 4 is a groove for leading element, 5 is muddy water, 6 is liquid, 7 is a solidifying material layer, 8 is a groove for trailing element. , 9 is a trailing element, 15 is a granular filler, 21 is a male joint member, 25 is an engaging portion, and 26 is a male joint.

Claims (1)

[Claims] 1. A tube 3 made of a flexible material, the lower end of which is closed in the female joint 1 of a steel preceding element 2 having a female joint 1 having a partially cut-out circular cross section which extends in the vertical direction. In the state where the tube is accommodated, the preceding joint element 2 is arranged in the muddy water 5 in the groove 4 for the preceding element provided in the ground, and the liquid 6 is injected into the tube 3 to expand the tube. 3 is brought into close contact with the inner peripheral surface of the female joint 1, and then the preceding element groove 4 and the preceding element 2
After providing a solidifying material layer or a granular filler between them, the groove 8 for the trailing element is excavated, then the tube 3 is pulled out upward from the female joint 1, and the steel is inserted into the groove 8 for the trailing element. A method for constructing a continuous underground wall, in which the trailing element 9 is inserted and the trailing element 9 is directly or indirectly inserted and connected to the female joint 1 of the preceding joint portion element 2.