JPH0673728A - Method of joining continuous walls and reaction device used in iys installation - Google Patents

Abstract

PURPOSE:To reduce number of steel members required for joint installation, to improve working efficiency, to reduce construction cost and period, and in connection with taking of reaction force by natural ground against lateral pressure of setting material, ensuring transfer of the reaction force and to improve working efficiency of installation and removal. CONSTITUTION:Both ends of continuous wall steel members 11 and 12 are provided with fitting joints 11a and 12a, and the joints 11a and 12a are mutually fitted in, and the steel members 11 and 1 2 are connected to each other. At the time of placing setting material, a section 18 of a reaction device A which has an expansion jack 20 is fitted into the joint 11a of the member which has not yet been fitted into, and the reaction force is taken by the natural ground via the device A. The reaction device A is constituted with a pushing plate 17 and a bearing plate 21 that are connected together via the expansion jack 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a joint between elements for constructing a connecting wall such as a cast-in-place type earth retaining wall or a water-impervious wall for each element, and a solidification material side pressure in the construction For a reaction force device for taking a reaction force against 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 solidifying material such as concrete and to exert a reaction force against the lateral pressure of the solidifying material.

In the conventional joint construction of the RC structure wall, as shown in FIG.
In addition to the reinforcing bar 1 as a structural material, a joining steel plate 2 is attached to an end surface (concrete joining side) of concrete, and side steel plates 3 are further installed on both sides thereof as shown in FIG. Then, for leakage prevention, as shown in FIG. 9, the gap between the side steel plate 3 and the ground is sealed with a hard rubber sheet 4. As for the solidified material side pressure (concrete end face pressure), as shown in FIG. 10, the joint protection steel material 5 and the joint protection plate 6 are installed around the projecting end portion 1a that serves as the joint of the reinforcing bar 1. The reaction protection material 7 made of steel or the like is placed between the joint protection plate 6 and the joint steel plate 2 in a required number of layers, and crushed stones 8 are filled between the joint protection plate 6 and the ground. The pressure of the solidified material is transmitted to the ground.

[0004]

However, the above-mentioned conventional example has the following problems. Since the joined steel plate 2 is not included in the wall structure material, it is uneconomical, and due to the problem of manufacturing accuracy, it is required to be manufactured accurately in the factory unlike the rebar baskets that are generally manufactured on site. It was one of the factors that pushed up the construction cost.

It is necessary to separately provide a steel material for protecting the joint and a steel material that transmits a reaction force.
Furthermore, a large amount of labor is required for a series of operations such as the input and removal of crushed stones, which greatly increases the construction cost. It was difficult to completely remove the crushed stone.

In view of the above problems in the prior art, it is an object of the present invention to reduce the number of steel materials required for joint construction and to make effective use of them, improve workability, reduce construction cost, and shorten construction period. Another object of the present invention is to provide a reaction force device that can reliably transmit the reaction force when the reaction force is applied to the solidified material side pressure and that has good workability in installation and removal.

[0007]

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

In the reaction force device according to the present invention, the pressure support plate and the pressure plate to be brought into contact with the natural ground are connected via the expansion and contraction jack, and the pressure plate is fitted with the fitting joint provided at the end of the wall member. It is a projecting joint protection part that fits with the part. It is preferable that the pressure support plate is swingably supported by the telescopic jack.

This reaction force device may have a structure in which the pressing plate and the joint protection portion are vertically long, and a plurality of pressure supporting plates are connected to the pressing plate at vertical intervals through expansion jacks. .

[0010]

Since the steel connecting wall member is provided with the fitting joint portions at both ends thereof, it can be connected only by fitting the fitting joint portions to each other. With respect to the lateral pressure of the solidified material, a part of the reaction force device is fitted to the fitting joint portion of the unfitted steel wall member to extend the telescopic jack, and the ground force is transmitted via the reaction force device. The reaction force can be taken by transmitting to. In this case, since a part of the reaction force device is fitted in the unfitted fitting joint portion, the reaction force device can be installed at an appropriate position for taking the reaction force, and the fitting joint portion It is possible to prevent the infiltration of solidifying material into the.

Since the reaction force device is one set in which the pressure bearing plate and the pressing plate are connected through the expansion jack,
It is easy to handle, 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 now be described in detail with reference to the drawings. FIG. 1 (plan view) shows one construction example of the method according to the present invention. The excavator excavates the excavation groove 10 for one element, and the H-shaped male and female two-type steel wall member 11 is formed therein.
12 are alternately arranged, and the fitting joint portions 11a and 12a at both ends of both flanges are fitted and connected to each other to be built.
The fitting joint portions 11a at both ends of the steel connecting wall member 11 have a female shape, that is, a shape in which a slit is provided in the entire length of the vertically long pipe, whereas the fitting end portions of the steel connecting wall member 12 are fitted. The joint portion 12a is a male type, that is, has a T-shaped cross section in the entire vertical length.

A female steel wall member 11 is used for both ends of one element, and at the center of the outer surface of both flanges of the steel wall member 11, that is, at a position facing the web 13, for example, a mountain steel 14 is used. To the rubber sheet 1
5, the rubber sheet 15 is used to seal the gap between both side wall surfaces of the excavation groove 10, and the concrete placing area for one element is defined together with the webs 13 of the female steel wall members 11 at both ends. Also, reaction force devices A are installed at both ends of the excavation groove 10, and the reaction force device A and the unfitted fitting joint portions 11a of the female steel wall members 11 at both ends are utilized to make the excavation groove 10 respectively. A reaction force is applied to the wall surfaces at both ends as described below. Then, in this state, concrete 16 is placed in the concrete placing area to construct one element of the connecting wall.

An example of the reaction device A is shown in FIGS.
In this reaction force device A, a pair of pipe-shaped or rod-shaped vertically long joint protection portions 18 are provided in parallel on the front surface of the vertically long pressing plate 17 via ribs 19, and, for example, on the rear surface of the pressing plate 17 are provided. Three hydraulic expansion / contraction jacks 20 are provided so as to project vertically at a predetermined interval, and a pressure support plate 21 is swingably supported by a universal joint 22 at the tip of each expansion / contraction jack 20. Each telescopic jack 20 can be individually telescopicized by hydraulic pressure supplied from a hydraulic pump (not shown) through a hose 23.

The reaction device A is provided with 1 on one side of the trench 1.
Platform or multiple units as shown in FIG.
The joint protection portion 18 is fitted to the unfitted fitting joint portion 11a of the female steel connecting wall member 11 to be a joint with the next element, and the fitting protection portion 18 is moved up to the required height along the fitting joint portion 11a. Hang it down and temporarily receive it with a hanging wire. Then, the expansion jack 20 is extended to bring the pressure bearing plate 21 into pressure contact with the end surface of the excavation groove 10, and the side pressure acting on the female steel wall members 11 at both ends from the cast concrete 16 is applied to both end surfaces of the excavation groove 10. Communicate to.

In this case, since each expansion / contraction jack 20 is individually expandable / contractible and each pressure bearing plate 21 is also individually swingable, in each reaction force device A, the joint protection portion 18 is connected to the fitting joint portion 11a. Even if fitted, it is possible to follow the unevenness of the end face of the excavation groove 10. Further, each reaction force device A has its joint protection section 18
Is fitted into the fitting joint portion 11a, the reaction force can be accurately transmitted to the female steel connecting wall members 11 at both ends by accurately positioning at a position suitable for taking a reaction force.

Further, the joint protection portion 18 of the reaction force device A is fitted into the fitting joint portion 11a of the female steel wall member 11 which serves as a joint with the next element while the concrete 16 is being poured. Therefore, even if there is leaked concrete, it is prevented from entering. If you continue to pour concrete, the distribution of lateral pressure will change depending on the rise in the crown height and the elapsed time.
As shown in FIG. 3, the reaction force device A is sequentially moved as needed so that an appropriate reaction force can be obtained with respect to 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 smoothly moved, and concrete or foreign matter can be prevented from entering during the movement. it can. As shown in FIG. 4, the reaction force device A is sequentially removed from unnecessary ones.

In the case of concrete, the lateral pressure of the solidifying material varies depending on the composition, wall thickness, casting speed, etc.
Usually, it is said that about 12 to 13 tons per square meter, the position showing the maximum lateral pressure rises with the passage of time, and in the solidified material which is close to liquid, the lateral pressure distribution is almost the same as the hydraulic pressure. Therefore, the installation position of the reaction force device, the number of units used, and the like are determined according to the properties of the solidified material and the construction conditions.

The construction depth is shallow, and the steel wall member 11 is used.
When the lateral pressure of the solidifying material does not become too large, such as when the rigidity of 12 is high, the reaction force device A may not be used, and only 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. In one unit B1, a pair of pipe-shaped or rod-shaped vertically long joint protection portions 18 are provided in parallel with each other through ribs 19 on the front surface of the vertically long pressing plate 17, and the pressing plate 1 is provided.
The male type rail 24 is provided on the back surface of 7. The other unit B2 has a female rail 26 protruding from the front of a vertically long steel material (for example, H-shaped steel) 25, and the vertically long steel material 2
A telescopic jack 20 is provided so as to project from the back surface of 5, and a support plate 21 is fixedly or swingably supported at the tip of the telescopic jack 20.

When the reaction 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 connecting wall members are provided with fitting joints at both ends, they can be connected by simply fitting the fitting joints to each other, thus eliminating the need for joining steel plates other than structural materials as in the past. It can be expected to shorten the construction period and the construction cost.

With respect to the lateral pressure of the solidified material, a part of the reaction force device is fitted to the fitting joint portion of the unfitted steel wall member to extend the telescopic jack, and the reaction force device is used. Since it is possible to take a reaction force by transmitting it to the ground, it is not only necessary to use multiple joint protection materials, reaction materials, crushed stones, etc. as in the past, but also to install and remove these. Therefore, the workability is greatly improved.

Since crushed stone is not used, foreign matter such as crushed stone is not left inside the wall.

When installing the reaction force device, a part of the reaction force device is fitted to the fitting joint portion of the steel wall member, so that the reaction device is accurately positioned at a position suitable for taking a reaction force, and the steel wall member is installed. The reaction force of the natural ground can be reliably transmitted to the member, and furthermore, the fitting joint portion can be protected by a part of the reaction force device to prevent the infiltration of the solidifying material and the foreign matter.

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

Further, the reaction device according to the present invention has the following effects. (1) Since the pressure bearing plate and the pressure plate are connected to each other via the expansion jack, the set is easy to handle and can be repeatedly used as it is.

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

(3) When the pressure bearing plate is swingably supported on the telescopic jack as described in claim 4, it is possible to follow the unevenness of the ground upon installation.

(4) When the pressing plate and the joint protection portion are vertically long and a plurality of pressure supporting plates are connected to the pressing plate at intervals in the vertical direction through expansion jacks, respectively. The lateral pressure of the solidified material can be efficiently transmitted over a wide range by one reaction force device and without being affected by the unevenness of the ground.

[Brief description of drawings]

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

FIG. 2 is a side view of the above.

FIG. 3 is a side view showing the reaction force device moved upward from the state shown in FIG.

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

FIG. 5 is a plan view of an example of a 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 a solidified material leakage prevention example in a conventional construction method.

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

[Explanation of symbols]

 A / B Reaction force device 11/12 Steel connecting wall member 11a ・ 12b Fitting joint part 16 Concrete 17 Press plate 18 Joint protection part 20 Expansion jack 21 Pressure plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kimiaki Ishihara 2-5-8 Kita-Aoyama Minato-ku, Tokyo Stock company inter-company (72) Inventor Masahiko Hayakawa 2-5-8 Kita-Aoyama Minato-ku, Tokyo In-house group (72) Inventor Miki Tsukasa 2-3-6 Otemachi, Chiyoda-ku, Tokyo New Nippon Steel Corporation (72) Inventor Kazuyuki Tasaki 2-3-6 Otemachi, Chiyoda-ku, Tokyo New Within Nippon Steel Co., Ltd. (72) Inventor Masaki Tatsuta 2-6-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Steel Co., Ltd. (72) In-house Toshio Watanabe 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (5)

[Claims] 1. A fitting joint portion is provided on both ends of a steel wall member,
When the fitting joint portions are fitted to each other to connect the steel connecting wall members to each other, and when the solidifying material is cast, the fitting joint portion of the unfitted steel connecting wall member has an expansion jack. A method for constructing a joint for a connecting wall, characterized in that a part of the force device is fitted and a reaction force is applied to the natural ground through the reaction force device. 2. A joint wall joint construction according to claim 1, wherein the reaction force device is moved along the fitting joint portion as the height of the top end of the solidified material is raised. Method. 3. A joint for connecting a pressure plate and a pressing plate, which are brought into contact with the natural ground, through a telescopic jack, and the pressing plate is fitted with a fitting joint portion provided at an end of the connecting wall member. A reaction force device for connecting joints of connecting walls, which is characterized in that a protective portion is projected. 4. A reaction force device for jointing a joint wall according to claim 3, wherein the pressure bearing plate is swingably supported on the telescopic jack. 5. The pressing plate and the joint protection portion are vertically long, and the plurality of pressure bearing plates are connected to the pressing plate at intervals in the vertical direction via expansion and contraction jacks. The reaction force device for joint construction of a continuous wall according to.