JPH08240032A - Connecting structure for side wall and continuous underground wall in underground structure - Google Patents

Abstract

PURPOSE: To transmit the force except the vertical force from a side wall to a continuous underground wall, and not to arrest the temperature shrinkage of the side wall completely. CONSTITUTION: A separation sheet 10 is stretched between a side wall 2 and a continuous underground wall 1 to keep both walls 2, 1 from adhering and binding to each other. Many binding bars 20 extended in the radial direction are buried in the projected state in the inner surface of the continuous underground wall 1, the projected parts are covered with caps 22, and the separation sheet 10 is pressed by the collars 23 of the caps 22. A separation agent 24 such as grease or the like is applied to the surface of the cap 22 and then concrete is placed to construct the side wall 2 where the cap 22 is buried. Only the radial movement of the side wall 2 is permitted, and the stress except the above is transmitted to the continuous underground wall 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a side wall and a continuous underground wall in an underground structure such as an LNG storage underground tank.

[0002]

2. Description of the Related Art As a method of constructing an underground structure, there are a forward winding method and a reverse winding method. For example, in the construction of an underground tank, both methods are almost the same until the continuous underground wall surrounding the tank construction area is constructed into a cylindrical wall shape by reinforced concrete, and then the ground inside the continuous underground wall is set to a predetermined depth. The normal winding method is to form the bottom slab after excavating everything, and then construct the side wall along the inside of the continuous underground wall. The reverse winding method is to construct the side wall sequentially from the top along the side wall. In any case, an underground structure that serves as a storage space is constructed inside the side wall. By the way, the side wall is constructed by placing concrete using the continuous underground wall as the outer formwork.At that time, the connecting bar that extends horizontally in the radial direction is embedded in advance on the inner surface of the continuous underground wall. Every time, the connecting line is protruded by connecting it by the protruding length to the side wall, and the side wall is included to improve the connecting force of the side wall to the continuous underground wall and prevent the tank from floating. The structure is taken.

By the way, for example, when the stored material of the tank is an ultra-low temperature material such as LNG, a phenomenon occurs in which the side wall is contracted and displaced inward in the radial direction under the influence of the ultra-low temperature. This temperature contraction is restrained because the side wall is connected to the continuous underground wall by the connecting line, and as a result, cracks may occur in the side wall. As an underground tank that takes this into consideration, the actual fair 6-27593
Japanese Unexamined Patent Publication (Kokai) proposes an underground tank using a slip bar type connecting bar that transmits only a vertical force and enables the side wall to contract in the radial direction, that is, the axial direction of itself.

[0004]

The underground tank of the above publication has the following problems. That is, the slip bar type connecting bar transmits only the force in the vertical direction, and it is impossible to transmit the stress in other directions, for example, in the circumferential direction. Also, after the construction of the continuous underground wall, the side wall where the concrete is placed is adhered and bonded to the uneven surface of the continuous underground wall, making it difficult for both walls to be cut off, and the temperature shrinkage of the side walls is restrained by the continuous underground wall, causing cracking. .

The present invention has been made in view of the above circumstances and is capable of transmitting a force other than the vertical direction, for example, a circumferential force of an underground tank, from a side wall to a continuous underground wall, and the temperature of the side wall. It is an object of the present invention to provide a joint structure of a side wall and a continuous underground wall in an underground structure that does not restrain contraction at all.

[0006]

According to a first aspect of the present invention, a connecting structure of a side wall and a continuous underground wall in an underground structure is a continuous underground wall constructed in the ground and the inside of the continuous underground wall. A continuous underground wall and side wall connection structure in an underground structure in which both walls are connected by a connecting streak interposed perpendicularly to the boundary surface of both walls between the side wall constructed close to ,
An edge-cutting sheet is stretched between the side wall and the continuous underground wall, one end of the connecting bar is fixed to the continuous underground wall, and the other end has a flange that holds the edge-cutting sheet and its surface. It is characterized in that it is buried in the side wall in a state in which a cylindrical cap provided with an edge cutting agent on the side wall is covered.

According to a second aspect of the present invention, in the connecting structure of the side wall and the continuous underground wall in the underground structure according to the first aspect, the cap is made of an elastic material, and the cap is formed by elastic deformation. It features a structure that is fitted and fixed to the end side.

[0008]

According to the present invention, since the edging sheet is stretched between the side wall and the continuous underground wall, both walls are in an edging state in which they are not adhered to each other. Further, the side wall is not restricted by the continuous underground wall, and only the movement of the connecting muscle in the axial direction is allowed, and the movement in the other direction, for example, the circumferential direction is restricted by the connecting muscle. Therefore, when a temperature shrinkage movement is attempted to occur on the side wall, the side wall slides along the outer peripheral surface of the cap covered by the connecting muscles (the surface of the cap on which the edging agent is provided), and is restrained by the continuous underground wall. Shrinks without receiving heat. When the side wall receives a force other than the radial direction, such as the vertical direction or the horizontal direction other than the radial direction, for example, the circumferential direction, the force is transmitted to the continuous underground wall via the connecting muscle, and the rigid structure is retained. When the water blocking sheet is used as the edge cutting sheet, the brim of the cap that covers the connecting line presses the edge cutting sheet and makes close contact with the sheet surface, so the entry of water from the continuous underground wall to the side wall is blocked by the edge cutting sheet. At the same time, there is no risk that the concrete on the side wall will leak to the back of the edging sheet during concrete pouring. In addition, if the cap that covers the connecting muscle is formed of an elastic material such as a resin material and the diameter is expanded by elastic deformation so that the cap is fitted and fixed to the connecting muscle, the cap can be easily and surely connected. In addition to fixing the cap to the connecting muscle, there is no need to use an adhesive between the cap and the connecting muscle or to form a screw on the cap or the connecting muscle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an underground tank will be described below with reference to the drawings. FIG. 1 shows the underground tank T, and reference numeral 1 is a continuous underground wall. The continuous underground wall 1 is constructed in a cylindrical wall shape in the ground G so as to surround the tank construction area. A side wall 2 is formed inside the continuous underground wall 1, a bottom slab 3 is formed at the bottom, and further on the upper part. The lid plate 4 is constructed to configure the underground tank T. Each of these constituent parts is constructed of cast concrete.

An edge-cutting sheet 10 is stretched between the side wall 2 and the continuous underground wall 1 so as to cover the entire inner peripheral surface of the continuous underground wall 1. The edging sheet 10 is made of a material such as polyethylene which is cut into a rectangular shape or a belt shape having a thickness of about 0.5 mm and has a large number of edges. In addition, when viewed from the inside of the underground tank T, the entire surface is covered with the upper one covering the lower one.

The continuous underground wall 1 and the side wall 2 are connected to each other by a large number of connecting lines 20 arranged in a lower portion of the side wall 2. The connecting muscles 20 are arranged in a plurality of rows in the vertical direction and are arranged in a large number in the circumferential direction. As shown in FIG. 2, one end side of the connecting streak 20 is embedded and fixed by an epoxy resin 21 or the like in a hole formed by radially drilling the inner surface of the continuous underground wall 1, and the other end side thereof is a continuous ground. It projects from the inner surface of the middle wall 1, and its axial direction is set horizontally in line with the radial direction of the underground tank T. A circular hole is formed in a portion of the edge cutting sheet 10 where the connecting bar 20 is provided, and the connecting bar 20 is formed in the hole.
Has been passed through.

As shown in FIG. 3, a tubular cap 22 is placed on the other end of the connecting bar 20, and the cap 22 is buried in the side wall 2. The cap 22 is made of, for example, a resin such as soft vinyl chloride, has a cylindrical shape with a bottom, and a flange 23 is formed at the end portion on the opening side. The inner length of the cap 22 is substantially the same as the protruding length of the connecting bar 20 from the continuous underground wall 1, and the inner diameter is slightly smaller than the outer diameter of the connecting bar 20. Further, the diameter of the collar 23 is larger than the outer diameter of the connecting bar 20 and is set to a size capable of sufficiently closing the hole of the edging sheet 10 through which the connecting bar 20 passes. Then, the cap 22 is pushed to the protruding end side of the connecting bar 20 from the opening side of the cap 22 while being expanded by elastic deformation until the brim 23 presses the edge cutting sheet 10, thereby covering the connecting bar 20. . The cap 22 is in close contact with and fixed to the connecting muscle 20 with a strong frictional force. The surface of the cap 22 is coated with grease, a peeling agent or the like as an edge cutting agent 24 with the side wall 2. Since the edge cutting agent 24 is applied to the surface of the cap 22 as described above, the side wall 2 and the cap 22 and thus the connecting streak 20 are not directly connected, but in the vertical direction from the side wall 2 and, for example, in an underground tank. Horizontal stress such as the circumferential direction of T is transmitted to the continuous underground wall 1, and only radial stress is slid by the edging agent 24 and is not transmitted.

Next, a procedure for constructing the underground tank T will be briefly described. First, the continuous underground wall 1 is built in the ground G. Next, in the case of the normal winding method, the ground G inside the continuous underground wall 1 is completely excavated to a predetermined depth, the bottom slab 3 is formed, and the edging sheet 10 is put on the inner surface of the continuous underground wall 1. As described above, one end side of a large number of connecting muscles 20 is embedded and fixed in a hole formed by drilling a radial direction at a predetermined location of the continuous underground wall 1 and further a cap 22 is provided on the other end side.
The connecting sheet 20 and the edge-cutting sheet 10 with the cap 22.
It is pressed against one continuous underground wall with the tsuba 23. After that, after applying an edging agent 24 such as grease or a release agent on the surface of the cap 22, the side wall 2 is laid between the continuous underground wall 1 and the inner formwork is assembled at a predetermined interval. ,
Concrete is placed between the formwork and the continuous underground wall 1 to bury the cap 22 in the side wall concrete and
To build. Further, in the case of the reverse winding method, while excavating the ground G from the surface of the ground, the edge cutting sheet 10 is stretched inside the continuous underground wall 1 each time according to the progress thereof, and then the side wall 2 is sequentially constructed to form a predetermined location. Edge cut sheet 10
And the connecting bar 20 is embedded in the continuous underground wall 1, the cap 22 is further covered with the connecting bar 20, and then the edge cutting agent 24 is applied to the surface of the cap 22, and then the side wall 2 is continuously constructed. , Bottom plate 3 is formed. And both methods,
Finally, the lid plate 4 is provided to complete the construction.

According to the connecting structure of the side wall 2 and the continuous underground wall 1 in the underground tank T according to the present embodiment, the connecting bar 20 buried in the side wall 2 has the cap 22 covered by the connecting bar 20. Since the edging agent 24 is applied to the surface, the side wall 2 is not restricted by the underground continuous wall 1 at all, and only the movement of the connecting muscle 20 in the axial direction is allowed. The movement in the direction) is restrained by the connecting muscle 20. Therefore, when the temperature shrinkage that moves inward in the radial direction occurs in the side wall 2, the side wall 2 is correspondingly
Slides along the outer peripheral surface of the cap 22 (the surface of the cap 22 on which the edging agent 24 is provided) covered by the connecting muscles 20, and the temperature shrinkage occurs without receiving a restraining force.
Further, even if the pumping pressure acts on the bottom slab 3 and a force to raise the side wall 2 is applied, the connecting bar 20 receives the force and transmits it to the continuous underground wall 1, and conversely, the continuous underground wall 1 The weight is transmitted to the side wall 2 and the rise of the side wall 2 is suppressed. further,
When a stress (shear force) in a horizontal direction other than the radial direction, such as a circumferential direction, is relatively generated between the continuous underground wall 1 and the side wall 2 due to an earthquake or the like, the stress is transmitted to the continuous underground wall 1, The side wall 2 is supported by the continuous underground wall 1 to hold the rigid structure. That is, the stress other than the radial direction is transmitted from the side wall 2 to the continuous underground wall 1, and the displacement of the side wall 2 is restrained by the continuous underground wall 1.

Further, since the edging sheet 10 is stretched between the continuous underground wall 1 and the side wall 2 and the both walls 1 and 2 are not joined, the temperature shrinkage of the side wall 2 causes the continuous underground wall 1 to contract. It is avoided that it is bound by an adhesive bond. The edge-cutting sheet 10 is stable in a state in which it is pressed down by the collar 23 of the cap 22 covered by the connecting streak 20 and stretched on the wall surface without causing problems such as turning over, and moreover, from the continuous underground wall 1. It blocks the leakage of groundwater in the inside of the side wall 2. Along with this, the concrete on the side wall 2 has a brim 2.
There is no danger of being blocked by 3 and leaking to the continuous underground wall 1 side

The cap 22 put on the connecting muscle 20 is
As long as it is made of a material having elasticity, it is configured to be fitted and fixed to the connecting bar 20 by the diametrical expansion deformation, so that the cap 22 can be easily and securely used without using an adhesive. The cap 22 can be fixed to the connecting muscle 20 and screws can be formed on the inner surface of the cap 22 and the connecting muscle.
Alternatively, since the connecting bar 20 does not need to be processed, the construction cost can be reduced.

[0017]

As described above, according to the first aspect of the present invention.
In the connection structure between the side wall and the continuous underground wall in the underground structure according to (1), an edge cutting sheet is stretched between the side wall and the continuous underground wall, and one end side of the connecting line interposed between the both walls is continuous. It is fixed to the underground wall, and the other end side is buried in the side wall in a state that it has a brim that holds the edging sheet and the surface is covered with a cylindrical cap having an edging agent for the wall. Therefore, the temperature shrinkage in the radial direction of the side wall is completely allowed without being constrained by the continuous underground wall, and in the vertical direction or in the horizontal direction other than the radial direction, such as the circumferential direction in the case of an underground tank. When the side wall receives a force other than in the radial direction, the side wall is supported by the continuous underground wall via the connecting muscles, and the movement due to the force is blocked to hold the rigid structure. In addition, when the edge cut sheet is pressed down by the brim of the cap that covers the connecting bar, and if a water shield sheet is used as the edge cut sheet, intrusion of groundwater from the continuous underground wall to the side wall is blocked by the edge cut sheet. In addition, the concrete on the side wall does not leak to the side of the continuous underground wall.

Further, like the connecting structure of the side wall and the continuous underground wall in the underground structure according to claim 2, the cap for covering the connecting line is formed of an elastic material such as a resin material, and elastic expansion deformation is performed. If the cap is fitted and fixed to the connecting muscles, the cap can be easily and surely fixedly attached to the connecting muscles, and processing such as using an adhesive or forming screws on the caps or connecting muscles is required. Since there is no such thing, the construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an underground tank to which an embodiment of the present invention is applied.

FIG. 2 is a side sectional view showing details of a joint structure of a side wall and a continuous underground wall.

FIG. 3 is a perspective view showing a cap that covers the connecting muscle.

[Explanation of symbols]

1 ... Continuous underground wall, 2 ... Side wall, 3 ... Bottom plate, 4 ... Lid plate, 10
... Edge-cutting sheet, 20 ... Connecting line, 22 ... Cap, 23
… Tsuba, 24… edging agent, T… tank.

Front page continuation (72) Inventor Masaki Wakabayashi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Innovator Masanobu Kuroda 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Masafumi Adachi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd.

Claims (2)

[Claims] 1. A connecting bar interposed between a continuous underground wall constructed in the ground and a side wall constructed close to the inside of the continuous underground wall in a state orthogonal to the boundary surface of both walls. Is a connecting structure of a side wall and a continuous underground wall in an underground structure that connects both walls by, an edge sheet is stretched between the side wall and the continuous underground wall, and the connecting muscle has one end side thereof. It is fixed to the continuous underground wall, and the other end side is buried in the side wall in a state that it has a brim for pressing the edge cutting sheet and the surface is covered with a tubular cap provided with an edge cutting agent for the side wall. A combined structure of a side wall and a continuous underground wall in an underground structure. 2. The side wall in the underground structure according to claim 1, wherein the cap is made of an elastic material, and is fitted and fixed to the other end side of the connecting muscle by elastic deformation. And the continuous underground wall.