JP3005664B2 - Joint construction method of connecting wall and reaction force device used for the construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a joint between elements when constructing a continuous wall such as a cast-in-place type retaining wall or a water impervious wall for each element, and a method of constructing a joint between the elements. And a reaction force device for taking a reaction force at the ground.

[0002]

2. Description of the Related Art In forming a joint between elements of a continuous wall, it is necessary to prevent leakage of a solidified material such as concrete and to take a reaction force against a solidified material side pressure.

[0003] In the joint construction of the conventional RC structure connecting wall, FIG.
As shown in (1), apart from the reinforcing bar 1 as a structural material, a joining steel plate 2 is attached to an end face (joining side) of concrete, and side steel plates 3 are further installed on both sides thereof. For preventing leakage, the gap between the side steel plate 3 and the ground is sealed with a hard rubber sheet 4 as shown in FIG. As shown in FIG. 10, a joint protection steel member 5 and a joint protection plate 6 are provided around the protruding end portion 1a serving as a joint of the reinforcing bar 1 with respect to the solidified material side pressure (pressure at the end face of the concrete). A required number of reaction members 7 of steel or the like are stacked and installed between the joint protection plate 6 and the joining steel plate 2, and crushed stones 8 are filled between the joint protection plate 6 and the ground. The solidified material side pressure is transmitted to the ground.

[0004]

However, according to the above-mentioned prior art, there are the following problems. Since the joined steel plate 2 is not included in the continuous wall structural material, it is uneconomical, and due to the problem of manufacturing accuracy, unlike the reinforced cage, which is generally manufactured on site, it is required that the steel plate be manufactured accurately in a factory. This contributed to the increase in construction costs.

[0005] A steel material for protecting the joint and a steel material for transmitting the reaction force are separately required.
In addition, a series of work such as input and removal of crushed stone requires a great deal of labor, which greatly increases the construction cost. It was difficult to completely remove the crushed stone.

An object of the present invention is to reduce the number of steel materials required for joint construction, effectively use the joints, improve workability, reduce work costs, and shorten the work period in view of the above-mentioned problems in the related art. Another object of the present invention is to provide a reaction force device that can reliably transmit the reaction force when taking a reaction force against the solidified material side pressure at the ground, and has good workability in installation and removal.

[0007]

According to the joint wall connecting method of the present invention, fitting joints are provided at both ends of a steel connecting wall member, and the fitting joints are fitted to each other to form a steel connecting wall. When the members are connected to each other and the solidified material is cast, a part of a reaction force device having an expansion jack is fitted to a fitting joint portion of an unfitted steel continuous wall member, and the reaction force device is Take the reaction force to the ground through. The reaction force device can move the fitting joint portion of the steel continuous wall member while protecting the steel joint wall member from the solidified material or the like along with the rise of the height of the top of the solidified material.

The reaction force device according to the present invention is characterized in that a supporting plate and a pressing plate which are brought into contact with the ground are connected via a telescopic jack, and the pressing plate is connected to a fitting joint provided at an end of the continuous wall member. The joint protection part which fits with the part is provided protrudingly. The support plate is preferably supported so as to be swingable with respect to the telescopic jack.

This reaction force device can have a structure in which the pressing plate and the joint protection portion are vertically long, and a plurality of supporting plates are vertically connected to the pressing plate via expansion / contraction jacks. .

[0010]

Since the steel continuous wall members have fitting joints at both ends thereof, they can be connected only by fitting the fitting joints to each other. With respect to the side pressure of the solidified material, a part of the reaction force device is fitted to the fitting joint of the unfitted steel continuous wall member to extend the telescopic jack, and the ground is grounded through the reaction force device. The reaction force can be taken by transmitting the force. In this case, since a part of the reaction force device is fitted to the unfitted fitting joint portion, the reaction force device can be installed at an appropriate position for taking the reaction force, and Infiltration of the solidified material or the like into the air can be prevented.

[0011] The reaction force device is a single set in which the supporting plate and the pressing plate are connected via a telescopic jack.
The handling is easy, and the reaction force can be transmitted according to the situation at the site by simply extending the telescopic jack, and the installation position can be easily moved and removed by contracting.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 (plan view) shows one example of the method according to the present invention. The excavator excavates the excavation groove 10 for one element, into which H-type male and female steel connecting wall members 11.
12 are alternately arranged, and the fitting joints 11a and 12a at both ends of both flanges are fitted and connected to each other.
The fitting joints 11a at both ends of the steel continuous wall member 11 are of female type, that is, a shape in which a slit is provided in the entire length of the vertically long pipe. The joint portion 12a is of a male type, that is, has a T-shaped cross section in the vertical direction.

For both ends of one element, a female steel connecting wall member 11 is used. In addition, for example, an angle steel 14 is provided at the center of the outer surfaces of both flanges of the steel connecting wall member 11, that is, at a position facing the web 13. And a rubber sheet 1
The rubber sheet 15 is used to seal the gaps between the side walls of the excavation groove 10 and, together with the webs 13 of the female steel continuous wall members 11 at both ends, a concrete casting area for one element is defined. Further, reaction force devices A are installed at both ends of the excavation groove 10, respectively, and the reaction force devices A and the unfitted fitting portions 11a of the female steel continuous wall members 11 at both ends are used to form the excavation grooves 10. The reaction force is applied to both end wall surfaces as described later. Then, in this state, concrete 16 is cast in the concrete casting area and one element of the continuous wall is constructed.

FIGS. 5 and 6 show an example of the reaction force device A. FIG.
This reaction force device A has a pair of pipe-shaped or rod-shaped vertically long joint protection portions 18 projecting in parallel via ribs 19 on the front surface of a vertically long pressing plate 17, and also has, for example, a rear surface of the pressing plate 17. Three hydraulic telescopic jacks 20 are protruded at predetermined vertical intervals, and a support plate 21 is swingably supported at the tip of each telescopic jack 20 by a universal joint 22. Each telescopic jack 20 can be individually expanded and contracted by hydraulic pressure supplied from a hydraulic pump (not shown) through a hose 23.

[0015] The reaction force device A includes one
Or a plurality of units are suspended by a crane C or the like as shown in FIG.
The joint protection portion 18 is fitted to an unfitted fitting joint portion 11a of the female steel continuous wall member 11 serving as a joint with the next element, and reaches a required height along the fitting joint portion 11a. Suspended and temporarily received with hanging wires. Then, the telescopic jack 20 is extended to press the support plate 21 against the end face of the excavation groove 10, and the lateral pressure acting on the female steel continuous wall members 11 at both ends from the cast concrete 16 is applied to both end faces of the excavation groove 10. To communicate.

In this case, since each extensible jack 20 can be individually extended and retracted, and each supporting plate 21 can also be individually swung, each reaction force device A is provided with the joint protection portion 18 connected to the fitting joint portion 11a. Even if it is fitted, it can follow the unevenness of the end face of the excavation groove 10. Further, each reaction force device A is provided with its joint protection portion 18.
Is fitted to the fitting joint portion 11a, so that the reaction force can be reliably transmitted to the female steel continuous wall members 11 at both ends by accurately positioning it at an appropriate position for taking the reaction force.

Further, the joint protection portion 18 of the reaction force device A is fitted to the fitting joint portion 11a of the female steel continuous wall member 11 serving as a joint with the next element while the concrete 16 is being poured. Therefore, even if there is any leaked concrete, it is prevented from entering. As the concrete placement continues, the distribution of lateral pressure changes depending on the rise of the top height and the elapsed time,
As shown in FIG. 3, the reaction force device A is sequentially moved as necessary so that an appropriate reaction force can be obtained for the change. In this case, the joint protection portion 18 slides along the fitting joint portion 11a while being fitted to the fitting joint portion 11a, so that the reaction force device A can be moved smoothly, and the intrusion of concrete or foreign matter can be prevented even during the movement. it can. As shown in FIG. 4, the reaction force devices A are sequentially removed from unnecessary ones.

In the case of concrete, the solidified material side pressure varies depending on the composition, wall thickness, casting speed, and the like.
Usually, it is said to be about 12 to 13 tons per square meter, and the position showing the maximum value of the lateral pressure rises with the passage of time, and the solidified material close to a liquid state has a lateral pressure distribution substantially equal to the liquid pressure. Therefore, the installation position, the number of the reaction force devices, and the like are determined according to the properties of the solidified material, construction conditions, and the like.

It should be noted that the construction depth is shallow, and
When the lateral pressure of the solidified material is not excessively large, such as when the rigidity of the material 12 is high, the countermeasures A may not be used and only the leakage prevention measures may be adopted.

FIG. 7 shows another example of the reaction force device. This reaction force device B is composed of two separable units B1 and B2. One unit B1 is provided with a pair of pipe-shaped or rod-shaped vertically long joint protection portions 18 protruding in parallel through ribs 19 on the front surface of a vertically long pressing plate 17.
7 is provided with a male rail 24 projecting therefrom. The other unit B2 has a female rail 26 projecting from a front surface of a vertically long steel material (for example, an H-shaped steel) 25 and
A telescopic jack 20 is protrudingly provided on the back surface of the telescopic jack 5, and a supporting plate 21 is fixed to the end of the telescopic jack 20 or supported so as to swing freely.

When this reaction force device B is used, the male rail 24 of the unit B1 is fitted to the female rail 26 of the unit B2. These units B1 and B2 are relatively movable up and down, and can be slightly bent at the fitting portions of the male and female rails.

[0022]

The effects of the joint construction method of the present invention are as follows. Since the steel continuous wall member is provided with fitting joints at both ends thereof, it can be connected only by fitting the fitting joints to each other, so that there is no need to use a joint steel plate other than the structural material as in the related art. It can be expected to shorten the construction period and the construction cost.

With respect to the side pressure of the solidified material, a part of the reaction force device is fitted to the fitting joint of the unconnected steel continuous wall member to extend the telescopic jack, and through the reaction force device. By transmitting the reaction force to the ground, the reaction force can be taken, so not only is there no need for multiple joint protection materials, reaction force materials, crushed stones, etc., but also the installation and removal work of these Therefore, workability is greatly improved.

Since no crushed stone is used, foreign matter such as crushed stone does not remain in the wall.

When installing the reaction force device, a part thereof is fitted to the fitting joint of the steel continuous wall member, so that it is accurately positioned at an appropriate position for taking the reaction force and is connected to the steel continuous wall member. The ground reaction force can be reliably transmitted to the member, and the fitting joint portion can be protected by a part of the reaction force device to prevent infiltration of solidified material and foreign matter.

When the reaction force device is moved, the reaction force device can be moved up and down along the fitting joint of the steel continuous wall member, so that the reaction device can be moved smoothly and the fitting joint can be moved during the movement. Can be protected.

According to the reaction force device of the present invention, the following effects can be obtained. (1) Since the supporting plate and the pressing plate are connected to each other via a telescopic jack, the set is easy to handle and can be used repeatedly as it is.

(2) The reaction force can be transmitted according to the situation at the site simply by extending the telescopic jack, and the installation position can be easily moved and removed by contracting.

(3) As described in claim 4, if the supporting plate is supported swingably on the telescopic jack, it can follow the unevenness of the ground at the time of installation.

(4) If the pressing plate and the joint protection portion are vertically long and a plurality of supporting plates are vertically connected to the pressing plate via the telescopic jack, respectively, The lateral pressure of the solidified material can be efficiently transmitted over a wide range by one reaction force device without being affected by the unevenness of the ground.

[Brief description of the drawings]

FIG. 1 is a plan view showing one application example of a method according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a side view in which the reaction device has been moved upward from the state of FIG. 2;

FIG. 4 is a side view in which a reaction force device that is no longer necessary from the state of FIG. 3 is removed.

FIG. 5 is a plan view of an example of the reaction force device.

FIG. 6 is a side view of the reaction force device.

FIG. 7 is a plan view of another example of the reaction force device.

FIG. 8 is a schematic plan view of a conventional construction method.

FIG. 9 is a plan view showing an example of solidified material leakage prevention in a conventional construction method.

FIG. 10 is a plan view showing an example of joint part protection and reaction force countermeasures in a conventional construction method.

[Explanation of symbols]

 AB reaction device 11 ・ 12 Steel continuous wall member 11a ・ 12b Fitting joint part 16 Concrete 17 Press plate 18 Joint protection part 20 Telescopic jack 21 Support plate

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kimiaki Ishihara 2-58-8 Kita-Aoyama, Minato-ku, Tokyo Co., Ltd. Intra-company group (72) Inventor Masahiko Hayakawa 2-58 Kita-Aoyama, Minato-ku, Tokyo Co., Ltd. (72) Inventor: Hikaru Miki 2-6-3, Otemachi, Chiyoda-ku, Tokyo Nippon Steel Corporation (72) Inventor: Kazuyuki Tazaki 2-6-1, Otemachi, Chiyoda-ku, Tokyo New Japan Inside Steel Corporation (72) Inventor Masatake Tatsuta 2-6-1 Otemachi, Chiyoda-ku, Tokyo Nippon Steel Corporation (72) Inventor Toshio Watanabe 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (56) References JP-A-54-81616 (JP, A) JP-A-56-30244 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D 5 / 18-5/20

Claims (5)

(57) [Claims] 1. A fitting joint is provided at both ends of a steel continuous wall member,
When the fitting joints are fitted to each other to connect the steel connecting wall members to each other and the solidified material is cast, the fitting joint of the unfitted steel connecting wall member has a telescopic jack. A joint construction method for connecting walls, wherein a part of a force device is fitted and a reaction force is applied to the ground through the reaction force device. 2. The joint construction of a connecting wall according to claim 1, wherein said reaction force device is moved along said fitting joint portion as the height of the top of the solidified material is increased. Method. 3. A joint in which a supporting plate and a pressing plate which are brought into contact with the ground are connected via a telescopic jack, and the pressing plate is fitted with a fitting joint provided at an end of the continuous wall member. A reaction force device for connecting a joint of a continuous wall, wherein a protection part is protruded. 4. The reaction force device according to claim 3, wherein the supporting plate is swingably supported by the telescopic jack. 5. The pressure plate and the joint protection portion are vertically long, and a plurality of the pressure supporting plates are connected to the pressure plate via a telescopic jack at intervals vertically. A reaction force device for connecting a joint of a continuous wall according to item 1.