JP3473778B2 - Continuous wall method and equipment used for it - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous wall construction method, and more particularly, to a technique for ensuring continuity of a reinforced member or a lateral strip at a boundary portion between a leading panel and a trailing panel.

[0002]

2. Description of the Related Art In the construction of a continuous wall construction method, a plurality of leading panels are formed at a predetermined interval, and then a trailing panel is formed between the leading panels. Here, unless the continuity of the reinforcing material or the lateral strip at the boundary between the preceding panel and the following panel is ensured, the strength at the joint part of the panel is reduced, and the strength and reliability of the entire continuous wall becomes a problem. Will occur.

On the other hand, in the prior art, when forming the preceding panel, a joint bar or joint strip is installed at a joint with the succeeding panel so that the transverse strip and the succeeding panel of the preceding panel are installed. Continuity with the horizontal strips was secured.

[0004]

Here, in the prior art, when installing a joint strip, a steel plate is built in a continuous wall groove to serve as a preceding panel so that a portion in the vicinity of the joint and other portions can be installed. It was necessary to partition and crush stones near the joint. However, the work of assembling steel plates and the addition or removal of crushed stone is a very complicated work. Then, when a plurality of preceding panels are formed, it is necessary to repeat such a complicated work, and it is necessary to spend a great deal of labor and cost. Therefore, there has been a demand for a technique capable of easily installing the joint strip during the construction of the continuous wall construction method, but such a technique has not been proposed yet.

The present invention has been proposed in view of such problems of the prior art, and an object of the present invention is to provide a technology capable of easily installing a joint strip during construction of a continuous wall construction method.

[0006]

The continuous wall construction method of the present invention comprises:
It includes a continuous wall groove excavating step of excavating a continuous wall groove to be a preceding panel, and an erection step of building a cage in the excavated continuous wall groove, wherein the cage is a continuous longitudinal strip and a horizontal direction. It is composed of a direction strip, a spacing member and a joint strip, and crosses a part of the excavation surface on the side connected to the trailing panel of the excavated continuous wall groove during the building process. With this, a slit for inserting a joint strip is formed by excavating a predetermined distance.

In carrying out this continuous wall construction method, in the apparatus used in the continuous wall construction method of the present invention, a support member to which the lower end portion of the cage is attached and a monitor provided at the end portion of the support material. The monitor includes a pair of nozzles which are arranged at a predetermined interval in the vertical direction and eject a cross jet, and the cross jet ejected from the nozzle is a continuous wall groove in which a cage is built. It is set to form a slit for inserting a joint strip by excavating a part of the excavation surface on the side connected to the trailing panel by a predetermined distance.

Further, in the continuous wall construction method of the present invention, at the same time as excavating the continuous wall groove to be the preceding panel, a part of the excavation surface on the side connected to the trailing panel is excavated by the cross jet for a predetermined distance. To form a slit for inserting a joint strip and an erection process of building a cage in the excavated continuous wall groove, wherein the cage is a continuous longitudinal strip and a horizontal strip. And a spacing member and a joint strip.

In carrying out this continuous wall construction method, in the apparatus used in the continuous wall construction method of the present invention, the excavation mechanism for excavating the continuous wall groove to be the preceding panel and the upper part of the excavation mechanism are vertically moved. A pair of nozzles that are arranged at a predetermined interval and eject a cross jet is provided, and the cross jet that is jetted from the nozzle is one of the excavation surfaces on the side connected to the trailing panel of the excavated continuous wall groove. It is set so as to excavate a portion by a predetermined distance to form a slit for inserting a joint strip.

Here, it is desirable to insert not only the joint strip but also the water blocking film into any one of the slits for inserting the joint strip.

In carrying out the present invention, as the excavating means for carrying out the continuous wall trench excavating step, any known excavating equipment can be used, but other than the so-called "bucket type" excavating machine is used. Preferably.

[0012] Further, it is preferable to use the technique disclosed in Japanese Patent Application No. 6-5534 previously filed by the applicant of the present invention for the cage building process.

In the practice of the present invention, in order to ensure the continuity of the transverse strips, the number of slits excavated and formed by the cross jets corresponds to the number of rows of the transverse strips, and their positions are also the same. Corresponds to the position of the horizontal strip.

[0014]

According to the continuous wall construction method of the present invention and the apparatus used therefor having the above-mentioned structure, the continuous wall groove is excavated as the preceding panel, and the cage is built in the excavated continuous wall groove. . Here, the cage is a continuous longitudinal strip,
It is composed of a horizontal strip, a spacing member, and a joint strip. When the cage is built, continuous vertical strips are inserted into the continuous wall grooves. At the time of building this cage, a so-called "cross jet" is jetted from a pair of nozzles arranged at intervals in the up-down direction, on the side connected to the trailing panel of the excavated continuous wall groove. A part of the excavated surface is excavated by a cross jet for a predetermined distance to form a slit for inserting a joint strip. And build a cage containing joint strips,
That is, at the same time as the cage is lowered, the joint strip is inserted into the formed slit.

Further, according to the continuous wall construction method of the present invention, at the same time as excavating the continuous wall groove to be the leading panel, the joint strip is inserted by a cross jet on a part of the excavated surface on the side connected to the trailing panel. It is possible to form a slit for use and insert the joint strip into the slit during the building process. Therefore, when the cage containing the joint strip is built, the installation of the joint strip is completed.

That is, according to the present invention, a slit having a width and a depth necessary and sufficient for inserting the joint strip is formed in the continuous wall groove excavation step or the building step,
When building the cage, the joint strip is inserted into the slit. Therefore, it is not necessary to install a partition plate (steel plate) and to charge and remove crushed stones, and the work becomes easier accordingly.

Here, when excavating the slit into which the joint strip is inserted, if the depth of the slit is too deep, it has a bad influence on the excavation work of the continuous wall groove for the trailing panel and the like, which is very inconvenient. . However, in the present invention, the cross jet is used to excavate the slit. Since the cross jet does not excavate farther than the portion where the two jets intersect or collide, the excavation is controlled by controlling the distance from when the jets jet to when the jets intersect (or collide). The distance can be controlled with extremely high accuracy. Therefore, the depth of the slit has an appropriate value and does not adversely affect the strength and reliability of the continuous wall.

[0018]

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

In FIG. 1, a continuous wall groove H for a preceding panel is excavated in the ground G where a continuous wall is to be constructed. Here, the excavation of the continuous wall groove H is performed by a known excavation device indicated by reference numeral 10 as a whole. The excavating device 10 can be used with any type of excavating equipment other than a so-called "bucket type" excavating machine. In addition, the code | symbol 8 has shown the excavation mechanism.

When the excavation trench H has been excavated to a predetermined depth level, the excavation device 10 is pulled up, and the strip material attaching device 12 as shown in FIG. In the illustrated embodiment, regarding the construction of the strip material or the cage, for example, Japanese Patent Application No. 6-
The technology disclosed in No. 5534 is used, and the building process will be described later.

In FIG. 2, a strip member mounting device (device for housing a cage) generally designated by reference numeral 12 is a support member 14 to which (the lower end portion of) a cage D is mounted, and monitor portions 16 and 1.
Includes 6 and. The cage D includes a plurality of vertical strips 6 ... (The configuration of the cage using the vertical strips 6 will be described later) and a horizontal strip 32 shown by a dotted line in FIG. .., lateral strip 32 ..., and joint strip 6J
..., and are composed of.

Here, the joint strips 6J ... are not only those projecting in the horizontal direction as shown in FIGS. 2 or 9 and 10, but are also inclined with respect to the horizontal plane as shown in FIGS. 11-14. It may be a protruding one. The details of the joint strip will be described later.

The monitor unit 16 is provided with a pair of nozzles 18A and 18B which are arranged at a predetermined interval in the vertical direction, and the jet J from the nozzles 18A and 18B, respectively.
A and JB are jetted. Here, the jets JA and JB form a so-called "crossed jet". Reference numeral 24 is a hose for supplying a liquid (for example, bentonite) forming the jets from the nozzles 18A and 18B.

In FIG. 2, if the strip attachment device 12 attached with the cage D is lowered into the continuous wall groove H, the jet JA,
By JB (cross jet), the slit H for inserting the joint strip on both end sides of the continuous wall groove H (the surface side connected to the succeeding panel)
2 are drilled. Then, the cage D is built as the strip attachment device 12 descends, and the joint strips 6J ... Are arranged in the excavated slit H2.

The strip mounting device 12 has the bottom portion HB of the continuous wall groove H.
When reaching, the building of the cage D is completed. However, although not shown, a water blocking film holding part is provided in the monitor part 16, a water blocking film is attached to the holding part, and the fitting strip and the water blocking film are attached to one of the joint strip insertion slits H2. It may be inserted.

The strip attachment device 12 as described above reaches the bottom portion HB of the continuous wall groove H to build a cage (not shown), and the joint strip formed in the continuous wall groove H. A state in which the joint strip 6J is built in the insertion slit H2 is shown in plan in FIG. Note that, in FIG. 3, the horizontal strips and the spacing members are represented only by dotted lines, and reference numerals and other details are omitted. As is clear from FIG. 3, in this embodiment, the longitudinal strips 6 ... Are arranged in two rows, and the horizontal strips are also required in two rows. Therefore, the joint strip insertion slits H2 are formed on both left and right sides. Two rows are formed on the surface. That is, the same number of slits H2 for inserting joint strips as the number of rows in which the transverse strips are arranged are formed.

After the cage (not clearly shown in FIG. 3) is built and the state shown in FIG. 3 is reached, concrete is poured. As a result, the preceding panel is created.

Next, referring to FIG. 4, the cage building process will be described in more detail.

In FIG. 4, above the opening of the continuous wall groove H, a spacer holder 101 having upper and lower openings slightly smaller than the opening is installed by means not shown. Inside the spacer holder 101, a spacer 110, which functions as a lateral member represented by reference numeral 32 in FIGS. 2 and 3, and a joint strip 6J are stacked and housed, and the four corners of these spacers 110 have high tension wires. (Eg Tegusu) 1
02 is connected to each other at a predetermined interval C. As described above, although not shown in FIG. 4, the side edge of the spacer 110, which functions as a lateral strip, is in contact with an adjacent panel, and the spacer 110 shown in FIG.
A joint strip as shown by -14 is provided.

The pair of through-holes 114 formed in the spacer 110 are provided in a longitudinal direction made of, for example, carbon fiber, which is wound around a reel (not shown in FIG. 4) and has tensile strength and flexibility. The direction strip 6 is inserted. Here, through hole 1
The inner diameter of 14 is formed sufficiently larger than the outer diameter of the longitudinal strip 6.

When the cage D is built, for example, when the spacing between the adjacent spacers 110 is too long, it is preferable to prevent the bending of the strip 6 by using the positioning member 4. The spacer 110 is made of a material having tensile strength and flexibility, but the positioning member 4 is usually made of plastic or the like.

When building the cage D in the mode shown in FIG. 4, a plurality of strips 6 and 6 wound around a reel (not shown)
, Are inserted into the through holes 114 of the plurality of spacers 110, 110 accommodated in the spacer holder 101, and the lower end portion is fixed to the lowest spacer (not shown) by any means. Then, by rotating the reel, the longitudinal strips 6, 6 ... Are fed out, and the spacers 110 ... Are sequentially pulled down from the spacer holder 101 and lowered.

When the lower ends of the longitudinal strips 6, 6 ... Have reached the bottom of the continuous wall groove H, the tops of the strips 6, 6 and the uppermost spacer 110Z are fixed by a known cone-shaped wedge 109. Then, the cage indicated by reference numeral D is assembled. And
Concrete is poured to form a continuous wall (not shown). At the time of this concrete pouring, the upper spacers of the lowest spacers are pushed up by the concrete, but the four high tension wires 102 keep the distance between the spacers at a predetermined interval C against the pushing force. As a result, the cage D is built.

5 and 6 show a state after the cage D including the joint strips 6J ... Is built. And the preceding panel made by pouring concrete is
Is designated by reference numeral PP. This preceding panel PP
To the following panel (indicated by a chain double-dashed line in FIG. 7) FP
It is a part of the joint strip 6J that projects to the side. The protruding portion of this joint strip 6J is the strip 6F of the trailing panel FP.
By overlapping with, the continuity of the horizontal strip is secured. As a result, the strength and reliability of the joint surface between the leading panel PP and the trailing panel FP are improved.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the embodiment of FIGS. 1-7 are designated by similar reference numerals.

In FIG. 8, an excavating device 10A for excavating a continuous wall groove H using the excavating mechanism 8 is substantially the same as the excavating device 10 shown in FIG. 1, but the excavating device 10A has a cross jet flow. A pair of nozzles (in FIG. 8, the nozzle state is not clearly shown) for ejecting the jet streams J1 and J2 are provided.

By the cross jets ejected from the nozzle,
The side connected to the trailing panel is excavated with a predetermined width and a predetermined depth, and the excavating device 10A descends to form the slit H2 for inserting the joint strip. Then, in the slit H2, a joint strip is inserted in the subsequent cage building process.

This second embodiment is shown in FIG. 1-7 except that the slit H2 is excavated at the same time as the continuous wall groove H is excavated.
Is almost the same as the first embodiment. Therefore, duplicate description of other configurations and operations will be omitted.

A mode in which the leading panel and the trailing panel are joined by the joint strip is shown in FIGS. 9-14. FIG. 9 mainly shows a mode of the joint when the continuous wall is used as a temporary structure, and for easy understanding, the state viewed from the plane and the state viewed from the front are combined and expressed. Ground G
A cage D is built in the casing D, and the cage D includes a vertical strip 6, a horizontal strip 32, a spacing member 34, and a horizontal strip 32.
It is composed of a joint strip 6J, which is formed as a projecting portion at both ends. Then, FIG. 10 shows the joining of the leading panel and the trailing panel in which the cage as shown in FIG. 9 is built.

FIGS. 11-14 show an example in which the continuous wall is used as the main installation. Fig. 11 (For ease of understanding,
In the case of (a state viewed from the front and a state viewed from the plane) are combined, the joint strip 6J extends obliquely upward, and the joining of the leading panel and the trailing panel is In that case, it becomes like FIG. On the other hand, in the case of FIG. 13 (for easy understanding, the state viewed from the front and the state viewed from the plane are expressed in combination), the joint strip extending diagonally upward and the diagonal downward And the joint strips extending in the direction are staggered. When joining the leading panel and the trailing panel, the joint strips are joined together in the manner shown in FIG.

The embodiments shown in the drawings are merely examples and do not limit the technical scope of the present invention. For example, for building a cage, see Fig. 4 or Japanese Patent Application No. 6-5.
It is not necessary to limit to the technology disclosed in No. 534.

[0042]

The effects of the present invention are listed below.

(1) The joint strip can be installed very easily and reliably.

(2) There is no need for complicated work such as installation of a partition plate and introduction of quarry.

(3) Since the slit for installing the joint strip is excavated by a cross jet, the depth of the slit is prevented from becoming unnecessarily large, which adversely affects the strength of the trailing panel or the entire continuous wall. There is no fear.

(4) The labor and cost spent for producing a continuous wall can be kept low.

[Brief description of drawings]

FIG. 1 is a front view showing a continuous wall groove excavation process in a first embodiment of the present invention.

FIG. 2 is a front view showing a cage building step in the first embodiment of the present invention.

FIG. 3 is a plan view showing a state after the cage is inserted in the first embodiment.

FIG. 4 is a perspective view showing one aspect of building a cage.

FIG. 5 is a plan view showing a state immediately after building the cage according to the first embodiment.

FIG. 6 is a front view showing a state immediately after building the cage according to the first embodiment.

FIG. 7 is a plan view showing a state at the time of forming the following panel after forming the preceding panel according to the first embodiment.

FIG. 8 is a front view showing a continuous wall trench excavation process in the second embodiment of the present invention.

FIG. 9 is an explanatory diagram showing an example of a joint strip, showing a state viewed from above in a plan view and a state viewed from a front below.

FIG. 10 is a diagram showing a joint mode of the joint strip shown in FIG. 9;

FIG. 11 is an explanatory view showing a state as viewed from above in a plan view and a state as viewed from below in a front view, showing another example of the joint strip.

FIG. 12 is a diagram showing a joint mode of the joint strip shown in FIG. 11;

FIG. 13 is an explanatory view showing a state as viewed from above in a plan view and a state as viewed from below in a front view, showing still another example of the joint strip.

FIG. 14 is a view showing a joint mode of the joint strip shown in FIG. 13.

[Explanation of symbols]

G: Ground where continuous walls should be constructed H ... Continuous wall groove for preceding panel H2: Slit for inserting joint strip C: Space between adjacent spacers D: cage 6 ... Longitudinal strip 6F: Strip panel material 6J ... Joint strip 8 ... Excavation mechanism 10, 10A ... Drilling equipment 12 ... Strip attachment device 14 ... Support material 16 ... Monitor section 18A, 18B ... Nozzle J1, J2, JA, JB ... Jet (cross jet) 24 ... Hose 32 ... Lateral strip 34 ... Spacing material 101: Spacer holder 102 ... High tension wire 110 ... Spacer 110Z ... Top spacer 114 ... through hole PP: Trailing panel FP: Leading panel

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Claims (4)

(57) [Claims] 1. A continuous wall groove excavating step of excavating a continuous wall groove to be a preceding panel, and an erection step of building a cage in the excavated continuous wall groove, wherein the cage is a continuous vertical groove. It is composed of a directional strip, a transverse strip, a spacing member and a joint strip, and the excavation surface on the side connected to the trailing panel of the excavated continuous wall groove during the building process. A continuous wall construction method characterized by forming a slit for inserting a joint strip by excavating a part of it with a cross jet for a predetermined distance. 2. A device for building a cage used in the continuous wall construction method according to claim 1, wherein a support member is attached to a lower end portion of the cage body, and the support member is provided at an end portion of the support member. The monitor includes a pair of nozzles which are arranged at a predetermined interval in the vertical direction and eject a cross jet, and the cross jet ejected from the nozzle is a continuous wall in which a cage is built. Used in the continuous wall construction method, characterized in that it is set to excavate a part of the excavation surface on the side connected to the trailing panel of the groove for a predetermined distance to form a slit for inserting a joint strip. Device. 3. At the same time as excavating a continuous wall groove to be a leading panel, a part of the excavation surface on the side connected to the trailing panel is excavated by a cross jet for a predetermined distance to insert a joint strip. It includes a step of forming a slit and a step of building a cage in the excavated continuous wall groove, wherein the cage is a continuous longitudinal strip, a transverse strip, a spacing strip and a joint strip. A continuous wall construction method characterized by being composed of and. 4. A device for excavation used in the continuous wall construction method according to claim 3, wherein an excavation mechanism for excavating a continuous wall groove to be a preceding panel, and a predetermined upper and lower direction in an upper portion of the excavation mechanism. A pair of nozzles that are arranged at intervals and eject a cross jet is provided, and the cross jet that jets from the nozzle is a part of the excavation surface on the side connected to the trailing panel of the excavated continuous wall groove. A device used in a continuous wall construction method, which is set so as to excavate a predetermined distance to form a slit for inserting a joint strip.