JP2000248542A - Solidifying material outflow preventive method from element in steel underground continuous wall construction method and steel underground continuous wall member used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely restrain the outflow of a solidifying material such as a concrete filled at preceding element execution work even if an excavating wall surface is not smooth. SOLUTION: In this steel underground continuous wall construction method, excavation is performed while stabilizing a groove wall by a stabilizing liquid, and after completing the excavation equivalent to the preceding element section length, steel underground continuous wall member 1A to 1E are built up while mutually connecting these, and next, after placing foot protection concrete 12 under the steel underground continuous wall members 1A to 1E, concrete is filled inside an excavating groove. Above preceding element execution prevents the outflow of a solidifying material such as the concrete filled by arranging packer bodies 6, 6 by filling mortar or concrete brought into close contact with an excavating groove wall on an outside surface of the steel underground continuous wall members 1A to 1E arranged in both end parts among the plural underground continuous wall members 1A to 1E.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solidified material for preventing a solidified material from flowing out to a joint portion when concrete is poured into an element (solidified material filling) in a steel underground continuous wall method. The present invention relates to an outflow prevention method and a steel underground continuous wall member used for the method.

[0002]

2. Description of the Related Art Conventionally, underground continuous walls have been excavated while stabilizing a trench wall using a stabilizing liquid, and after completion of a predetermined excavation, a reinforcing steel cage is erected and replaced with a stabilizing liquid. In most cases, a continuous reinforced concrete wall body buried in the ground is constructed by installing a reinforced concrete wall, but in recent years, it is called "NS-BOX" and has a substantially H-shaped cross section or box having fitting joints at both ends. A steel underground continuous wall member (hereinafter simply referred to as a steel continuous wall member) having a shape is built after excavation, and is filled with a solidifying material such as concrete as needed to provide high strength and thin wall continuous. A method of constructing a wall has been proposed and put to practical use.

[0003] The steel underground continuous wall method can reduce the wall thickness as compared with the conventional underground continuous wall method in which a steel cage is built and filled with concrete. Since it is a prefabrication method, it is possible to reduce the number of man-made operations such as welding work and to save labor. Since it is a factory product, there is no need for a processing yard on site. By connecting the short steel continuous wall members by bolting, handling becomes easy and construction is possible even in a narrow work place. Since the left and right steel connecting wall members are connected by a fitting joint, accuracy can be ensured even at a large depth exceeding 50 m, and the like. It is a construction method.

At the time of construction, a portion where a continuous wall is to be constructed is allocated to elements serving as concrete placing blocks, as in the prior art. As a construction procedure, a method in which the preceding element and the following element are alternately allocated in the direction of the continuous wall, excavation of the preceding element and concrete placement are performed first, and then excavation of the subsequent element and concrete placement are performed. There is a so-called one-sided pushing method in which excavation for each element and concrete casting are sequentially performed toward one side of the continuous wall to extend the continuous wall. A plurality of guts (units of excavation) are used per element.

[0005] An example of a method of constructing the preceding element and a method of constructing the latter element separately will now be described with reference to the drawings. First, the construction of the preceding element is stabilized by the excavator 50 as shown in FIG. If the excavation is performed while protecting the groove wall with the liquid, the steel connecting wall members 51, 51,.
Steel concrete wall member 51,
The concrete 52 is poured to prevent the 51... From moving, and finally a solidified material 53 such as concrete is filled.
FIG. 8 is a plan view of the continuous wall after the solidification material is filled.

[0009] On the other hand, as shown in FIG. 9, the section between the preceding elements is excavated by excavation using an excavator 50, and the joint is cleaned by a joint cleaner 54 (jet cleaning), as shown in FIG. 9. Or brush cleaning)
Then, after installing the steel connecting wall members 51, 51 ...
A solidifying material 53 such as concrete is cast.

When the preceding element is constructed, concrete leakage prevention measures are always taken to prevent the poured concrete (solidified material) from flowing toward the joint portion with the succeeding element. Since concrete is prevented from flowing out from the bottom opening of the steel continuous wall member by the solidified concrete, measures are taken to prevent the concrete from flowing out from the side portion of the steel continuous wall member.

In the example of the outflow prevention structure shown in FIG. 10, a pressing plate 54 orthogonal to the flange surface is fixed to the end position of the flange outer surface of the steel continuous wall members 51, 51 disposed at both ends by welding or the like. This is an example in which a rubber sheet 55 is connected to the tip of the holding plate 54 to prevent concrete from flowing out. This is an example, but most of the conventional ones attempt to prevent the concrete from flowing out by providing a rubber sheet in the longitudinal direction of the member even though the mounting structure is slightly different. Reference numeral 56 denotes a joint protection plate provided to prevent concrete or back crushed stone from flowing into the inside of the joint.

[0009]

However, in the case of the above-described structure for preventing the solidified material from flowing out by the holding plate 54 and the rubber sheet 55, the excavation accuracy is secured with high accuracy in the depth direction of the ground, and the wall surface is secured. If the smoothness is secured, the effect of preventing solidified material from flowing out can be quite expected, but in practice, the smoothness of the wall surface is poor, and the excavation width has a partial error due to the wall surface falling, falling down etc. However, there still remains a problem that a solidified material such as concrete flows out of a partially formed gap.

[0010] Therefore, the main object of the present invention is to provide a steel underground continuous wall construction method that can completely suppress the outflow of the solidified material even if the excavated wall is not smooth due to surface fall or collapse. To provide a method for preventing solidified material from flowing out and to provide a steel underground continuous wall member used for the method.

[0011]

According to the present invention, in order to solve the above-mentioned problems, excavation is performed while stabilizing the groove wall with a stabilizing liquid, and after excavation for the element section length is completed, the cross section is approximately H.
A plurality of steel underground continuous wall members each having a male or female joint are connected to each other at the flange end of the steel or box-shaped steel member, and then the lower part of the steel underground continuous wall members is connected. After laying concrete in the ground, in the element construction in the steel underground continuous wall construction method of filling the inside of the excavation trench with solidification material, among the plurality of steel underground continuous wall members, disposed at both ends On the outer surface of the steel underground continuous wall member, a packer body made of mortar or concrete filled in close contact with the excavation groove wall is provided to prevent the solidified material from flowing out. is there.

In a more specific mode, excavation is performed while stabilizing the groove wall with a stabilizing liquid, and after excavation for the element section length is completed, a male or female member is formed at the flange end of the substantially H-shaped or box-shaped steel member in cross section, respectively. A plurality of steel underground continuous wall members provided with female joints are connected to each other, and a plurality of steel underground continuous wall members are connected to each other, and then concrete is poured into the lower part of the steel underground continuous wall members, and then solidified in the excavation trench. In the element construction in the steel underground continuous wall method for filling the material, among the plurality of steel underground continuous wall members, for the steel underground continuous wall member disposed at the end, the outer surface of the flange Standing pieces that are respectively continuous in the longitudinal direction of the member are fixed at the end positions, and a pair of the rising pieces fixed to both ends of the outer surface of the flange, and a sheet for a packer is stretched between these standing pieces. During production Prevent the outflow of the solidified material by filling the inside of the sheet for packer with mortar or concrete and forming a packer body that is in close contact with the excavation groove wall before the filling of the solidified material is performed by using a member for the connecting wall. It is characterized by doing so.

[0013] In the present invention, since the packer body is provided on the outer surface of the steel underground continuous wall member disposed at both ends, even if the surface of the excavated wall is not smooth even if the wall surface falls or collapses. The expanded packer body is completely adhered to the excavation wall surface, so that the outflow of the solidified material can be completely suppressed.

On the other hand, the steel underground continuous wall members disposed at both ends are desirably manufactured in advance in a factory.
The steel underground continuous wall member used in the method of preventing solidified material outflow is a steel underground continuous wall member having a male or female joint at a flange end of a substantially H-shaped or box-shaped steel member, respectively. In the above, the upright pieces continuous in the longitudinal direction of the member are fixedly provided at the outer surface end positions of the flange, and the upright pieces fixed at both ends of the outer surface of the flange are paired, and the packer sheet is interposed between these upright pieces. It is characterized by being passed over.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a steel underground continuous wall member 1 used in the method for preventing solidified material from flowing out according to the present invention.
FIG. 2 is a perspective view of the packer body as viewed from above, and FIG.

A steel underground continuous wall member 1 comprises a steel member formed into a substantially H-shaped cross-section by a web 2 and flanges 3 and 4 at male and female joints at ends of the flanges 3 and 4 respectively.
In the illustrated example, the member is provided with the C-shaped female joints 5, 5,..., And as described above, is built while being connected to each other inside the groove after the excavation is completed. In addition, as for the joint shape, a standard type is illustrated, but a plurality of other types are prepared in advance.

In the present invention, particularly, the ready-made steel continuous wall member 1 is modified so that the outer surfaces of the flanges 3 and 4 are provided with the packers 6 and 6 filled with mortar or concrete. Specifically, standing pieces 7, 7,... Having an L-shaped cross section, which are respectively continuous along the longitudinal direction of the member, are fixed to both ends of the outer surfaces of the flanges 3, 4, respectively.
(4) a pair of opposing standing pieces 7, which are fixed at both ends,
The packer body 6 is formed by bridging a packer sheet 8 between the standing pieces 7, 7. A method of fixing the packer sheet 8 to the upright piece 7 is as follows. An end of the packer sheet 8 is sandwiched by a pressing plate 9 on a horizontal flange surface of the upright piece 7, and screws 10, 10 are arranged at predetermined intervals in the longitudinal direction of the member. .., But other fixing methods may be used. Reference numeral 11 denotes an injection pipe for filling mortar or concrete inside the packer sheet 8.

In the construction, excavation is performed while stabilizing the groove wall with a stabilizing liquid, and after excavation for the length of the preceding element section is completed, the left and right male or female joints are interconnected as shown in FIG. However, a plurality of, in this example, five steel continuous wall members 1A to 1E are erected. Of these steel continuous wall members 1A to 1E, steel continuous wall members 1A at both ends,
1E, the steel connecting wall member 1 shown in FIG. 1 and having the packer body 6 on the outer surface of the flange is used, and the intermediate steel connecting wall members 1B to 1D are the existing steel connecting wall members as they are. Used.

When the steel connecting wall members 1A to 1E have been completely installed, the reinforced concrete 12 is placed and the mortar or concrete is filled into the packer body 6.

The order of construction is as follows:
If the construction is performed in the order of 2 → packer body 6, the packer body 6 may not be in close contact with the excavated wall at the lower part of the steel continuous wall member 1.
First, the mortar or concrete is filled into the packer body 6 to a predetermined height position (at least an upper position from the upper surface of the compacted concrete 12), and then the compacted concrete 12 is poured. It is desirable to carry out.

The mortar or concrete filling operation for the packer body 6 is performed by supplying and connecting a unit injection pipe 11a having a predetermined length by using a hoist 13 or the like while supporting the injection pipe 11 on a guide wall. After the extension to the position, the injection pipe 11 and the hose of the transport pump 16 are connected, and the mortar or concrete carried by the mixer 14 from the ready-mixed plant is put into the hopper 15.

When the mortar or concrete is filled to a predetermined height through the injection pipe 11 and the packer body 6 is completely formed at the lower portion of the outer surfaces of the steel continuous wall members 1A and 1E, a tremy pipe (not shown) And the concrete 12 is poured to a predetermined height. The consolidation concrete 12 supports the steel continuous wall members 1A to 1E so as not to move when the concrete (solidified material) is filled, and the solidified material such as the concrete to be filled with the steel continuous wall members 1A to 1E. It has two functions to prevent it from flowing out from the lower end.

When the placing of the reinforced concrete 12 is completed, as shown in FIG. 3, the inside of the packer body 6 is filled with mortar or concrete again using the injection pipe 11 to complete the packer body 6. . The feed rate from the transfer pump 16 is set so that the top level of the mortar or concrete to be filled rises at a speed of 3 to 5 m / h as a guide. The injection pipe 11 is pulled out at appropriate times so as to be maintained at about 1 to 3 m. In addition, the length of the pipe is gradually shortened by extracting the unit injection pipe 11a as appropriate while adjusting to the filling amount of mortar or concrete. FIG. 4 is a perspective view showing a completed state of the packer body 6.

Next, if the joint protection plate 17 is provided on the C-shaped female joints 5, 5 of the steel connecting wall members 1A, 1E at the ends, the inside of the excavation groove, more precisely, as shown in FIG. To
Concrete, mortar, and mud mortar in the narrow space between the inside of the box surrounded by the steel continuous wall members 1A to 1E and the space between the flange surface and the excavation wall surface and between the packer bodies 6, 6. A solidifying material such as a mud solidifying material is filled using a tremy tube. In parallel with or prior to the concrete casting, crushed stones are introduced into the back side of the joint protection plates 17, 17.

Thereafter, the construction of the preceding element is completed,
At the stage where the excavation of the following element is completed, as shown in FIG.
By cleaning A and 1E, integration with the concrete poured into the following element is achieved. This joint cleaning machine 20 is provided with legs 20b, 20b fitted and inserted into the C-shaped female joints 5, 5 of the end steel continuous wall members 1A, 1E, and is a device which can be raised and lowered by hanging wires. The inside of the end steel continuous wall members 1A and 1E is cleaned by jetting jet water from a jet nozzle 20a provided on the inner surface side.

[0026]

As described above in detail, according to the present invention, since the packer body is provided on the outer surface of the steel ground wall member disposed at both ends, even if the wall surface is peeled off or collapsed. Even if the excavation wall surface is not smooth, it is possible to completely suppress the outflow of the solidified material such as concrete filled at the time of constructing the preceding element.

[Brief description of the drawings]

FIG. 1 is a perspective view of a steel underground continuous wall member 1 according to the present invention as viewed from above.

FIG. 2 is an overall construction procedure diagram of the packer body 6;

FIG. 3 is a view showing a procedure for filling mortar or concrete into a packer body 6;

FIG. 4 is a perspective view showing a completed packer body.

FIG. 5 is a plan view of a concrete (solidified material) casting situation.

FIG. 6 is a view showing a joint cleaning procedure when a subsequent element is constructed.

FIG. 7 is a plan view of a conventional general steel underground continuous wall.

FIG. 8 is a diagram showing a preceding element construction stage in the steel underground continuous wall method.

FIG. 9 is a subsequent element construction stage diagram in the steel underground continuous wall method.

FIG. 10 is a plan view showing an example of a measure for preventing solidified material from flowing out during construction of a preceding element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Steel underground continuous wall member, 2 ... Web, 3/4 ... flange, 5 ... C-shaped female joint, 6 ... Packer body, 7 ... Standing piece, 8 ... Packer sheet, 9 ... Holding plate, 10 ... Screw,
11 ... Injection pipe, 12 ... Consolidation concrete, 17 ...
Joint protection plate, 18: crushed stone, 20: joint cleaning machine

Claims (3)

[Claims] 1. Excavation is performed while stabilizing a groove wall with a stabilizing liquid.
A plurality of steel underground continuous wall members each having a male or female joint are connected to each other at the flange end of the steel or box-shaped steel member, and then the lower part of the steel underground continuous wall members is connected. In the element construction in the steel underground continuous wall method of filling the solidification material inside the excavation trench after placing concrete in the foundation, the steel underground continuous wall members are disposed at both ends. The outer surface portion of the steel underground continuous wall member is provided with a packer body filled with mortar or concrete that is in close contact with the excavation groove wall to prevent the solidified material from flowing out. A method for preventing solidified material from flowing out of elements in underground continuous wall construction. 2. Excavation is performed while stabilizing the groove wall with a stabilizing liquid.
A plurality of steel underground continuous wall members each having a male or female joint are connected to each other at the flange end of the steel or box-shaped steel member, and then the lower part of the steel underground continuous wall members is connected. In the element construction in the steel underground continuous wall method of filling the solidification material inside the excavation trench after placing the concrete in the foundation, the steel underground continuous wall member is arranged at an end portion of the members. For steel underground continuous wall members, upright pieces continuous in the longitudinal direction of the member are fixedly provided at the outer surface end positions of the flange, and the upright pieces fixed at both end portions of the outer surface of the flange are paired. A steel underground continuous wall member in which a packer sheet is stretched between the standing pieces is used, and before the solidification material is filled, mortar or concrete is filled inside the packer sheet and excavated. Solidifying material outflow preventing method from elements in steel underground continuous wall method being characterized in that so as to prevent the outflow of the solidified material by forming a packer body in close contact with the groove wall. 3. A steel underground continuous wall member provided with a male or female joint at a flange end of a substantially H-shaped or box-shaped steel member in cross-section, respectively, wherein said flange is disposed at an end position of an outer surface of said flange. And a pair of standing pieces fixed to both ends of the outer surface of the flange, and a sheet for a packer is stretched between these standing pieces. Wall members.