JPH02311621A - Joint structure and method of concrete frame plate for underground wall - Google Patents

Abstract

PURPOSE:To make appearance better as well as to improve miniaturization for a frame plate and water stoppability by piercing a bar supporting side pressure of placed concrete through a void between frame plates, while forming a longitudinal groove in this void and closing this groove doubly. CONSTITUTION:Each frame plate 2 consisting of a PC concrete front layer 21 with a seat part 23 and a permeable concrete rear layer 22 is parallelly installed with a void 3 in between and a bar 5 fixed to natural ground 1 is pierced through this void 3. A batten 6 and seat plates 8, 9 externally fitted in this bar are clamped by a nut, locking the frame plate 2 tightly. Next, concrete 12 is placed in space between the natural ground 1 and the frame plate 2 and, after being hardened, the seat plate 9 is removed and then the bar 5 is cut in the void 3. In addition, a sealant 13 is filled up in the void 3 and, after a longitudinal trough is formed, a cap 14 is inset, charging mortar 15 into a halving joint. Then, water seeping out of the natural ground 1 is discharged by way of the rear face layer 22, the longitudinal trough and a void 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure and method for jointing a concrete frame board for an underground wall constituting a disposable formwork for concrete cast between it and the ground.

[Conventional technology]

Conventionally, when constructing a concrete underground wall in front of the ground, a discarded formwork was erected with a space between it and the front of the ground.
Concrete is poured between this disposable formwork and the ground, and the said disposable formwork was composed of a plurality of concrete frame plates arranged side by side, but it is used to construct the said disposable formwork. If multiple frame plates are large, there is an advantage that the lateral pressure only needs to be supported at the left and right ends of the frame plates because the whole frame plate is one piece, but in order to manufacture this in a factory, etc. Not only does it require formwork, but it also makes transportation and construction difficult. For this reason, if the frame plates are divided into smaller pieces and a plurality of these smaller frame plates are jointed at the construction site to form a disposable form, the amount of concrete that is poured into each frame will be reduced. The lateral pressure must be supported individually in each frame,
For this purpose, it is necessary to install a bar between the earth and each frame plate, and to support the lateral pressure through this bar.In addition, it is necessary to install mortar between the left and right frame plates to be jointed. will be filled with joint material.

[Problem to be solved by the invention]

On the other hand, the concrete frame board for underground walls is composed of a front layer made of precast concrete and a rear layer made of permeable concrete integral therewith,
If the water seeping from the ground flows down to the lower water collection area through the layer on the rear surface, if the water permeability of the layer on the rear surface decreases due to clogging, the layer on the rear surface will There is a problem in that the water that has reached the layer cannot flow down through the clogged area and becomes stagnant.

In addition, in order to connect the rod material and frame plate to support the lateral pressure, the rod material is passed through a hole temporarily made in the frame, and a washer and a nut are attached to the tip of the bar material on the front and rear surfaces of the frame plate. Therefore, after the concrete has hardened, it is necessary to perform water-stopping treatment on the holes in the frame plate, and there is also an appearance problem in that the holes leave marks on the surface of the sacrificial formwork.

This invention was made with attention to these problems, and even if the water permeability of the rear layer of the concrete frame board for underground walls decreases, it ensures smooth flow of water and supports lateral pressure. The purpose is to eliminate the need for the rod to penetrate the frame plate, making it possible to downsize the frame plate and improve its water-stopping properties.

[Means to solve the problem]

In order to achieve the above object, the present invention has the following configuration, where the terms "front" and "back" refer to the indoor side surface formed by the underground wall as the front surface, and the surface opposite to this as the rear surface. The joint structure of the concrete frame board for underground walls of the present invention includes a plurality of frame boards consisting of a front layer made of precast concrete and a back layer made of permeable concrete and facing the front surface of the ground. In the joint structure of concrete frame plates for underground walls, which are jointed between mutually opposing end faces and constitute a disposable concrete formwork cast between them and the ground, the left and right frame plates are joined with a gap between them. A board is placed between the rear surfaces of both adjacent frame plates to partition the rear surface of the gap and the poured concrete, and a seat plate is placed between the front surfaces of both adjacent frame plates. A bar extending from the ground side is passed through the batten and the gap, and this bar is fixed to the seat board and the batten.

In addition, the joint method for concrete frame boards for basement walls is as follows:
A plurality of frame plates consisting of a front layer made of precast concrete and a back layer made of permeable concrete and facing the front side of the ground are placed adjacent to each other with a gap between the opposing end faces. After being erected, a batten is placed between the rear surfaces of both adjacent frame boards, touching the left and right rear surfaces, and a seat board is placed between both adjacent frame boards, touching the left and right front and rear surfaces individually, A bar extending from the ground side is passed through the batten, the gap, and the seat board, and the bar is fixed to the batten and the seat board, and then concrete is placed between the front surface of the ground and the rear surface of the frame board. After pouring and hardening, removing the seat plate and cutting the bar within the gap,
Thereafter, a sealing material is applied to a portion of the frame plate near the front surface within the gap, and a downspout is formed on the rear side of the sealing material in this gap.

In the joint method, there is a notch along the edge of the front surface of both adjacent frame plates, and a vertical groove formed by the notch in both frame plates is filled with a filler material to fill the gap together with the sealing material. It can also be severely occluded.

[Effect]

In the above-mentioned joint structure, the rods that support the lateral pressure of the concrete poured between the disposable formwork and the other piles pass between the left and right concrete frame plates, so there is no need to drill holes in the frame plates. The lateral pressure can be supported.

In addition, if groundwater from another mountain reaches the layer behind the frame plate through the concrete placed between the frame plate and the ground after the underground wall is constructed,
Water flows down the rear layer and is guided to a predetermined location at the bottom.

When the water permeability of the rear layer decreases due to clogging, water flows from side to side in the rear layer, flows down the gap between the frame plates as a downspout, and reaches the predetermined location.

In the above-mentioned joint method, when the tip of the bar and the seat plate that were on the front of the frame board are removed, there is no protrusion on the front of the disposable formwork, and since the bar was protruding from between the frame boards, No hole marks remain on the disposable formwork. The gap between the left and right frame plates is closed with poured concrete on the rear side and sealed with sealant on the front side to form a downspout.Water moves horizontally to the downspout, avoiding the area that is clogged with the layer on the back side. You will be guided. Furthermore, even if this downspout were to become blocked for some reason, water would be able to move through the gap between the rear layers of adjacent frame plates, so water would not flow down through the adjacent frame plate. can.

Here, if a phase notch is formed on the front surface of both frame plates and the vertical grooves formed by both phase notches are filled, the gap will be doubly closed by the sealing material and the filler material, so water will not be absorbed from the sealing material. Even if there is a leak, the filling material can prevent water from leaking to the front of the basement wall, and if there is a gap parallel to the downspout between the sealing material and the filling material, this gap can be Since it becomes the next downspout, even if water leaks from the sealing material, it will drain away from now on.

[Example] FIG. 1 is a plan cross-sectional view of an example, in which a plurality of frame plates 2 are arranged at a predetermined interval in front of a ground 1. The interval between the ground mass 1 and the frame board 2 is an area for pouring concrete 12 for the underground wall shown in Fig. 4, which will be described later. An outer formwork (not shown) may be placed with a gap large enough for a worker to fit between the two, and the concrete 12 may be cast between this outer formwork and the frame plate 2. This embodiment will be described below based on a construction method in which concrete is poured in the space between the frame plate 2 and the ground 1 without using the outer form.

The frame plate 2 has a front layer 21 made of precast concrete and a rear layer 2 made of known water-permeable concrete.
2, and both layers 21 and 22 are integrated. Further, a seat portion 23 integrated with the front layer 21 is provided on the rear layer 2 at a position along the edges extending in the vertical direction on the left and right sides of the frame plate 2.
It is formed flush with the surface of 2. Therefore, on the rear surface of the frame plate 2, the layer 22 on the rear surface is exposed in areas other than the seat portion 23.

Further, on the front surface of the frame plate 2, phase notches 24 are formed along edges extending in the vertical direction on the left and right sides of the frame plate 2.

Also, the rear layer 22 is cut out along the lower edge of the frame plate 2 to form a gap 25 (see FIG. 5).

The frame plates 2 are arranged in an upright manner with a gap 3 formed therebetween. In the gap 3, the rear end is attached to the ground 1 with an anchor 4.
The tip of a bar 5 made of an iron rod or the like fixed by known means such as the above passes through the hole. On the rear surface of the frame plate 2, a batten 6 covering the rear surface of the gap 3 is arranged along the edge of the frame plate 2 and spanning both frame plates 2. A nut 7 is attached to the bar 5 on the rear side of the frame plate 2.
are screwed together and a seat plate 8 is fitted on the outside, and on the front side of the frame plate 2, a seat plate 9 is fitted on the bar 5 and a seat plate 11 is fitted on the outside.
are screwed together.

Therefore, adjust the tightness of nuts 7, 11 and seat plate 8.
9 fixes the left and right frame plates 2 and fixes the eye plate 6 to the rear surface of the frame plate 2. In this embodiment, the bars 5 are arranged in three places, one above the other, and therefore the seat plates 8.9 are also arranged in three places, above and below. The portion of the frame plate 2 that this seat plate 8.9 comes into contact with is made into a seat portion 23 with high strength.

In this way, when the relative positions of both frame plates 2 and the relative positions of these and the ground 1 are determined, the gap 25 is opened from the rear surface of the batten 25a.
Block it with When the gap 25 is not open on the rear surface of the frame plate 2, that is, when the gap 25 is formed in a downward concave shape at the lower end of the layer 22 on the rear surface, the batten 25a is unnecessary.

Next, concrete (as shown in Figure 4) is placed between the ground 1 and the frame board 2.
12 is poured. Of course, reinforcing bars are placed here before the concrete 12 is placed. Since the gap 3 between both frame plates 2 is closed by the battens 6 on the rear side, the concrete 12 does not enter the gap 3.

Although the lateral pressure of the poured and installed concrete 12 is applied to the frame plate 2, the frame plate 2 is supported by the ground 1 at the left and right ends via the bar 5 equipped with a seat plate 9 and nuts 11. Therefore, the lateral pressure of the concrete 12 is supported by the ground 1.

After the concrete 12 hardens, the nut 11 is removed and the seat plate 9 is removed, and the tip of the bar 5 is inserted into the gap 3.
Cut inside. For this cutting, a separately manufactured tool can be used, or a known fusing machine can be used as is or by changing the size and orientation of the nozzle as necessary. Note that once the concrete 12 has finished hardening, the concrete 12 is replaced with the frame board 2.
It is integrated with the underground wall to form an underground wall as a whole.

A sealing material 13 having expandability and waterproofing properties is filled in the gap 3 at a position close to the front surface of the frame plate 2 to close the front surface of the gap 3. As a result, a downpipe utilizing the void 3 is formed. A vertically long cap 14 is fitted into the front end of the gap 3, and the vertical groove formed by the notch 24 in both frame plates 2 is filled with mortar 15 to make it flush with the front surface of the frame plate 2. . A surface finish 16 is applied to the front surfaces of the plurality of frame plates 2 which are thus connected in series, if necessary. This surface finish 1
6 may be covered with a finishing material or may be painted.

The water seeping out from the ground 1 reaches the rear surface of the frame plate 2 through cracks in the concrete 12, flows down the layer 22 on the rear surface, and reaches the void 25 forming a horizontal gutter.

- The water in the cavity 25 is discharged through a predetermined route, but
As shown in the figure, the water may be collected in an underground water collection pit 18 via a drain pipe 17. The water here may be pumped out by a pump or the like and used after predetermined treatment such as sterilization, or it may be directly disposed of.

If the rear layer 22 is clogged, the water will bypass the clogged area and flow down, but if the area of the clog is large, the water will not be able to flow down as it is, so it will flow left and right. Flows down from an unblocked area,
Further, it reaches the gap 3 which forms a relay machine and flows down from there. Therefore, even if clogging occurs over the entire width of one frame plate 2, water will flow down through the gaps 3 to the gaps 25 forming the horizontal gutter, and even if one gap 3 is clogged, the water will Through the layer 22 on the rear surface of the adjacent frame plate 2, the gap 3 on the side thereof is
and flows down from here.

Figure 6 shows a one-span disposable formwork 1 with three frame plates 2 arranged side by side.
It is a plan view of an example in which a 'O' is configured, in which the central frame plate 2 has a flat plate shape, and the left and right frame plates 2 are provided with bent portions 2a and have a planar shape. Such disposable formwork 10 is used by arranging a plurality of them at equal intervals, and as shown in FIG. A frame 10a is placed in between to close the block, and then concrete 12 is poured. Thereby, it is possible to construct an underground wall in which the columns A are integrated. In this case, the span can be adjusted by increasing or decreasing the number of flat frame plates 2.

Note that the rod supporting the lateral pressure of the frame plate 2 with the bending part 2a is connected to the frame plate 2 at the end without the bending part 2a by the means shown in FIGS. At one end, a frame 10 is hung between adjacent bent parts 2a.
By passing a bar between a and the ground 1, the lateral pressure of the concrete 12 is supported. In this case, the tip of the bent portion 2a is supported by a frame 10a, and this frame 10a is supported by a bar (not shown), so that the lateral pressure of the concrete 12 is supported by the ground 1. Of course, so-called vertical flaps and horizontal flaps are arranged on the front surface of the frame 10a.

In this way, the frame plate 2 can be used both with and without the bending part 2a, or only with the bending part 2a.

(Effects of the Invention) As explained above, in this invention, the rods supporting the lateral pressure of poured concrete are made to penetrate the gap between the left and right frame plates and protrude from the front side of the frame plates. It is no longer necessary to drill holes for passing through the frame bars, and therefore it is possible to joint multiple smaller frame plates, making it easier to manufacture and transport the frame plates. Even if the water permeability of the constituent rear layer decreases, the void used for the joint can be used as a downspout, so water can flow smoothly through the downspout. . Thus, in the present invention, it is possible to downsize the frame plate constituting the sacrificial formwork and to facilitate drainage of water from the rear surface of the sacrificial formwork.

In addition, if phase gaps are formed on the front surfaces of both frame plates and the vertical grooves formed by both phase gaps are filled, the gap will be doubly closed by the sealing material and the filling material, so water will not leak from the sealing material. There is also the effect that the filling material can prevent water from leaking to the front surface of the basement wall, even if the filling material exists.

[Brief explanation of drawings]

Figure 1 is a plan sectional view of the john section when the frame board is installed, Figure 2
The figure is a front view of the frame board when it is installed, Figure 3 is a rear view of the same,
Figure 4 is a plan cross-sectional view of the completed underground wall, Figure 5 is a cross-sectional view of the same side, Figure 6 is a plan view showing an example of disposable formwork, and Figure 7 is a diagram showing the use of the disposable formwork shown in Figure 6. FIG. 3 is a plan view of a basement wall. 1... Earth, 2... Frame board, 3... Void, 5...
Bar material, 6... batten, 8, 9... seat board, 10... discarded formwork, 12... concrete, 13... sealing material, 15... filling material, 21...・Front layer, 22...
Rear layer, 23... seat, 25... void. Patent Applicant Taisei Corporation Agent Patent Attorney Tetsuya Mori Patent Attorney Yoshiaki Naito Agent Patent Attorney Shimizu Masaru Agent Patent Attorney Makoto Ohga No. 1 Figure 2 Figure 3 Figure 1) 25 b
ti:)Q 5Figure 4

Claims (3)

[Claims] (1) A plurality of frame plates consisting of a front layer made of precast concrete and a rear layer made of permeable concrete and facing the front side of the earth are jointed between their mutually opposing end surfaces, In the joint structure of concrete frame plates for underground walls that constitute the disposable concrete formwork cast between the ground and the ground, the left and right frame plates are erected adjacent to each other with a gap between them, and both adjacent A batten that partitions the rear face of the gap and the poured concrete is placed between the rear faces of the frame plates, and a seat board placed between the front faces of both adjacent frame plates, the batten, and the gap are provided with a base plate. A joint structure of a concrete frame board for an underground wall, characterized in that a bar extending from the base is penetrated and the bar is fixed to the seat board and batten. (2) A plurality of frame plates consisting of a front layer made of precast concrete and a rear layer made of permeable concrete and facing the front side of the ground are placed with a gap between the mutually opposing end surfaces. After they are erected adjacent to each other, a batten is placed between the rear surfaces of both adjacent frame boards so that they are placed against the left and right rear surfaces, and a seat board is placed between both adjacent frame boards and placed on the left and right front and rear surfaces individually. A bar extending from the ground side is passed through the batten, the gap, and the seat board, and this bar is fixed to the batten and the seat board, and then between the front surface of the ground and the rear surface of the frame board. After concrete is poured and hardens,
The seat plate is removed and the bar is cut within the gap, and then a sealing material is applied to a portion of the frame near the front of the frame board within the gap, and a downpipe is installed behind the sealing material in this gap. A method for joining concrete frame plates for underground walls, characterized by forming. (3) There is a notch along the edge of the front surface of both adjacent frame plates, and the vertical groove formed by the notch in both frame plates is filled with a filler material to double the gap with the sealing material. 3. The method of joining concrete frame plates for underground walls according to claim 2, wherein the joints are closed.