JPS63220000A - Securing structure of thermal insulation member in reinforced concrete structure - Google Patents

Abstract

PURPOSE:To secure a board member firmly to the concrete body side without causing shearing breakdown or pressure breakdown of the board member, by fastening a plate inserted at an anchor bolt inserting position of the board member. CONSTITUTION:Many board members 14 composed of inorganic thermal insulation material are secured through an anchor bolt 12 to the inside of concrete body 10. A plate 16 previously formed with an insertion hole 16a having larger inner diameter than that of the anchor bolt is inserted into an anchor bolt insertion recess made in the board member 14. A receiving unit 20 is driven on the rear face of the insertion hole 16a, and a tightening nut 26 is driven through a spring member 24 at the projecting end of the anchor bolt 12. Consequently, breakdown of the board member 14 due to over tightening of nut can be prevented, and warping of the board member 14 due to differential thermal stress can be absorbed through compressible deformation of the spring 24.

Description

Detailed Description of the Invention (Industrial Application Field) This invention is a heat insulating material for concrete structures that require extremely high heat insulation properties, such as liquid barriers placed around low-temperature liquefied gas storage tanks. The installation involves structural improvements.

(Prior art) For example, liquid barriers placed around low-temperature liquefied gas storage tanks such as LPG and LNG have durability against extremely low temperatures when liquefied gas leaks, and high temperatures caused by leaked liquefied gas fires. Durability is required.

In this respect, a liquid barrier made of reinforced concrete alone is not only disadvantageous in terms of earthquake-resistant design, but also has many layers, as the concrete walls are inevitably formed thickly when considering the thermal gradient and thermal stress caused by the low-temperature liquid. It has to be a divided wall structure and takes a long time to construct. In addition, a single concrete wall structure has a disadvantage in terms of liquid tightness as it is prone to cracking due to thermal stress.

Therefore, it has been conventional practice to provide a heat insulating material on the inner surface of a concrete wall.

However, a heat insulating layer made of a synthetic resin such as urethane foam is not suitable as a heat insulating material for a dike due to its durability against high temperatures.

Therefore, in the past, as a material for the heat insulating material, a hard plate made of an inorganic heat insulating material formed in the shape of a tile, such as perlite concrete, light foam precast plate of foam glass, etc., was used, as shown in Fig. 3. The plate body 1 is connected to the liquid dike main body 2
The gaps between the plates 1 are filled with a joint material, and the gaps are either left as they are or filled with mortar or the like.

Note that if the plate 1 is directly fixed to the dike main body 2, unevenness will occur in the surface finish of the plate depending on the construction accuracy of the wall, so it is recommended to fix the plate 1 with a predetermined gap from the wall. I have to.

As a means for maintaining the gap at a constant distance, conventionally, a hard synthetic resin spacer block 4 is arranged around the outer periphery of the anchor bolt 3 on the back side of the plate 1, and the plate of the anchor bolt 3 is Fixation is completed by screwing the nut 5 into the protruding end from the washer 6,
Next, a filler 7 is filled in a recess 1a formed on the front surface of the plate 1 and forming the seat surface of the nut 5, thereby completing the assembly.

(Problems to be Solved by the Invention) However, the structure of this installation has the following various problems.

First of all, since the plate body 1 described above is made of a material that is relatively weak against tightening force, it is easy to cause shear failure or bearing stress failure due to excessive tightening of the nut 5. Ta.

As a countermeasure in this case, we use a torque wrench to obtain the optimal tightening condition, but in reality, even if the tightening torque is strictly controlled in this way, some cracks may occur during construction. was reported.

In addition, due to the structure of this installation, the surface of the dike body 2 has unevenness, and the spacer block 4 is used to maintain a constant gap distance, so the construction accuracy of the dike body 2 also depends on the plate body. 1, and when the wall surface is uneven, the plates 1 are not arranged on the same plane and tend to be uneven.

Yet another problem is that when the gap is filled with mortar, the plate 1 tends to warp significantly in the event of leakage of low-temperature liquefied gas, but in this state, the mortar has no ability to follow deformation. As a result, the plate body 1 has a habit of being destroyed at the joints with the anchor bolts 4, cracking, and peeling off.

This invention was made in view of the above-mentioned shortcomings of the prior art, and aims to be able to firmly fix the plate to the concrete frame without causing shear failure or bearing failure, and to achieve high precision in the construction of the concrete frame. It is possible to improve the finishing accuracy of the board surface regardless of the situation, and the board itself has a structure that absorbs warping, preventing cracking of the joint material and the board itself due to warping, and eliminating the inconvenience caused by this. The installation of insulation in concrete structures provided with structure provides structure.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a concrete structure which is formed into a tile shape with a predetermined gap provided between the inner side of the concrete structure and the concrete structure via anchor bolts. In a concrete structure formed by fixing and arranging a large number of plates made of inorganic heat insulating material, a plate is insert-molded in which an insertion hole having an inner diameter larger than the diameter of the anchor bolt is formed in advance at the anchor bolt insertion position of the plate. Then,
At the back of the insertion hole, a receiving nut is screwed onto the outer periphery of the anchor bolt, and a tightening nut is screwed onto the end of the anchor bolt protruding from the plate via a spring material, and the plate The gist is that the plate body is fixed to the anchor bolts while being sandwiched between nuts.

(Function) The tightening torque from each nut is not applied directly to the plate, but is received by the plate, so there is no damage to the plate due to over-tightening.

The distance between the plate and the concrete frame can be adjusted using a receiving nut.

When the plate is warped due to a difference in thermal stress, the deformation of the plate is absorbed by compressive deformation of the spring.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

FIG. 1 and FIG. 2 show an embodiment in which the present invention is applied to a heat insulating structure for a dike.

In the figure, reference numeral 10 denotes the main body of the dike, which is made of reinforced concrete or precast concrete, constructed prior to the insulation construction. The dike main body 10 has a convex cross-section, and has a large number of anchor bolts 12 regularly protruding from its inside.

Reference numeral 14 denotes a plate made of an inorganic heat insulating material fixed to the inner wall surface of the main body of the dike. It is also an inorganic heat insulating material with low temperature durability.

As shown in FIG.
A mounting plate 16 is integrally fixed to the bottom of the hole by insert molding in advance during precasting.

The plate 16 is made of a steel plate, and has an insertion hole 1 in the center thereof having an inner diameter sufficiently larger than the outer diameter of the anchor bolt 12.
6a, and the plate 14 is formed on the peripheral edge.
A plurality of anchors 18 are provided protrudingly to bite into the inside of the plate body 14.
is strongly connected to.

On the other hand, the male threaded portion 12 of the protruding end of the anchor bolt 12
A nut 20 for receiving the plate body 14 is screwed and fixed to a, and receives the back surface of the plate 16 with the anchor bolt 12 inserted into the insertion hole 16a.

In addition, a compression coil spring 2 is attached to the outer periphery of the protruding end of the anchor bolt 12 from the plate 16 via a washer 22.
4 is inserted, and by screwing and fixing a tightening nut 26 to the outer periphery of the anchor bolt 20 at the tip of the spring 24, the plate 16 is held between both nuts 20 and 26 while the spring 24 is compressed. The plate body 14 is fixed to the inner wall surface of the liquid barrier main body 10 by pinching. The gap d between the plates 14 and the dike main body 10 can be adjusted by adjusting the nuts 20, and the plates 14 can be mounted on the same plane without shifting their positions.

In addition, when fixing, the plate body 14 is directly attached with a nut 20.
26 is not applied, and the plate 16
It is supported only by the holding force of the anchor 18, and accidents such as cracking will not occur.

In the fixed state, in order to effectively utilize the spring pressure of the spring 24, a cap 28 made of a PVC pipe or the like is fitted around the outer periphery of the protruding end of the anchor bolt 12 from the plate 16 to form a space for accommodating the spring 24. In this state, the above-mentioned installation is performed by inserting a heat insulating filler 3 into the opening of the hole 14a.
Fill in 0.

Note that each plate body 14 is arranged in a tiled manner with predetermined vertical and horizontal gaps on the inner wall surface of the dike body 10, but at least a first
As shown in FIGS. (a) and (b), a spacer block 32 is interposed to prevent the spring 24 from moving downward, and in this state, the gap between the joints between adjacent plates 14 is filled with a joint material. 34, fixing of each plate body 14 is completed.

In the above configuration, when the plate body 14 is brought into contact with low-temperature liquefied gas or thermal deformation occurs in the plate body 14 due to a fire caused by the gas, the insertion hole 16a compresses the spring 24 due to the warpage. As a result, the plate body 14 remains fixed in a flexible state without being destroyed at the joint with the anchor bolt 12.

If the gap d is injected and filled with a synthetic resin foam having high elasticity, the foam will deform together with the plate 14 due to its deformation-following properties, and leakage of liquefied gas can be prevented if the joint 32 cracks.

Further, in the above embodiment, a coil spring is used as the spring 24, but other spring materials such as a disc spring, a plate spring, a rubber plate, etc. may be used.

(Effects) As explained in detail using the embodiments above, in this invention, when tightening a nut, torque is not applied directly to the plate, but is applied to the plate, so that the plate does not break due to excessive tightening. do not have.

Further, the distance between the plate and the concrete frame can be adjusted using a receiving nut, and the plates can be placed on the same plane with high accuracy without being affected by the finishing accuracy of the concrete frame.

In addition, in this invention, when the plate is warped due to a thermal gradient due to contact with leaked liquefied gas or flame, the deformation of the plate is absorbed by the compressive deformation of the spring, preventing damage at the joint with the anchor bolt. Peeling associated with this can be prevented.

Therefore, the present invention is suitable for attaching a heat insulating material to a concrete structure that requires extremely high heat insulation properties, such as a liquid barrier disposed around a low-temperature liquefied gas storage tank.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1(a) is a cross-sectional view of a dike according to the present invention, and FIG.
) is a front view, Figure 2 is an enlarged sectional view of section A in Figure 1(a),
FIG. 3 is a sectional view showing the structure of a conventional dike in which a heat insulating material is installed. 10...Dike main body/concrete frame) 12...
Anchor bolt 14... Plate body (insulating material) 16... Plate 16a... Insertion hole 20... Receiving nut 24... Compression coil spring (spring material) 26...
Tightening nut patent applicant Obayashi Co., Ltd.
Patent Attorney - Ken Iro Interpolation Patent Attorney Masatoshi Matsumoto Figure 1 (a) Figure 1 (b) Figure 2 -11-Y-111no

Claims (1)

[Claims] (1) A concrete structure in which a large number of plates made of inorganic heat insulating material formed in the shape of tiles are fixedly arranged inside a concrete frame with a predetermined gap between the concrete frame and the concrete frame via anchor bolts. , a plate is insert-molded in advance at the anchor bolt insertion position of the plate body, with an insertion hole having an inner diameter larger than the diameter of the anchor bolt, and a plate is inserted into the plate on the back surface of the insertion hole to receive the outer periphery of the anchor bolt. At the same time, a tightening nut is screwed onto the protruding end of the anchor bolt from the plate via a spring material, and the plate body is fixed to the anchor bolt with the plate sandwiched between the nuts. A fixing structure for a heat insulating material in a concrete structure, which is characterized by: