JPH10298917A - Formed core and its connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foamed core which can be surely connected even in the site of execution and can meet various kinds of standards, and its connection structure. SOLUTION: In a long foamed core 1 in which an upper member 2 is combined with a lower member 3, a fitting part comprising a recessed bar part an/or a projected bar part which is continuously formed in the longitudinal direction is provided on a lower surface 2a of the upper member 2, a fitting part comprising a projected bar part to be fitted to the recessed bar part provided on the lower surface of the upper member 2 and/or the recessed bar part provided on the lower surface 2a of the upper member 2 is provided on an upper surface 3a of the lower member 3, and the projected bar part is formed wider than the recessed bar part by 0.4-4.0 mm. The upper member 2 is combined with the lower member 3 without using any adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed core and a connecting structure thereof, and more particularly to a precast (PC) hollow floor plate bridge used as a subgrade of a bridge girder or an elevated road, and an R castable on site.
The present invention relates to the above-mentioned core and its connection structure which can be reliably connected and embed in reinforced concrete of a hollow C-plate bridge, and which can correspond to various standards.

[0002]

[Technical background] Reinforced concrete is a structural member with high load-bearing properties, in which the tensile strength of concrete is increased by a metal wire embedded inside, and is widely used for structures under heavy loads such as bridge girder and elevated roads. ing. However, since the reinforced concrete has a large weight per unit volume, it is common practice to reduce the weight by hollowing the inside.

Conventionally, an iron cylindrical form is placed in a form,
Concrete is poured into a space formed by the mold and the cylindrical mold to produce a lightweight reinforced concrete having a cylindrical hollow portion. Such lightweight reinforced concrete may be factory-produced (i.e., precast) or may be constructed on site, but in any case,
Since the cylindrical form is heavy, there is a problem that large heavy equipment is required and workability is poor. For these reasons, recently, lightweight foam cores that can be carried by human power are being used.

The foam core has advantages that it is lightweight, has good workability, is easy to construct on site, and does not need to be removed after being buried in concrete. However, on the other hand, there are the following problems.

(1) Unlike an iron cylindrical mold, a foam core has a length of about 2000 mm because of molding. Therefore, in actual use, it is necessary to connect a plurality of foam cores in the length direction. Conventionally, this connection is performed by using an adhesive, a tape, a connection jig (for example, Japanese Utility Model Laid-Open No.
No. 5707), there is a problem that the work efficiency of concrete casting is remarkably reduced, resulting in an increase in cost. Moreover, the pressure (buoyancy) applied to the foam core with the pouring of concrete is
Also a volume × 2.35ton / ^{m 3.} For this reason, the core joints connected only by the adhesive or the like are not enough to withstand the buoyancy, and the core joints may be separated when the concrete is poured.

(2) As a usual foam core, a rectangular foam block obtained by molding is used to have a desired shape using a processing jig such as a hot wire. Work using such a processing jig requires considerable work time and cost, has the disadvantage that the dimensional accuracy of the foam core is poor, and a large amount of material loss occurs due to processing. The square foam block is usually 2000 mm × 1000 mm × 5
The thing of about 00 mm is the mainstream. Therefore, if such a block is used as it is, a foam core having a height of 500 mm or more cannot be manufactured. In order to adjust the height, a foam core is composed of a plurality of members, and these members are used in an integrated manner. However, in such a foam core made of a plurality of members, each member cannot be integrated accurately, or even if the members can be integrated accurately, they are integrated by the buoyancy described above during concrete casting. There is a problem that the core is separated, and further, there is a problem that workability is deteriorated due to the use of an adhesive or a coupling member, and the cost is increased.

(3) Further, when a foam core is molded using a dedicated mold, the size (particularly height) of the foam core is determined by the type of a bridge girder or a subgrade. However, there is a problem that the standard dimensions are various, and it is necessary to prepare as many molds as the number of the types.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-described problems, and is capable of reliably connecting not only in a factory but also in a construction site, and is capable of complying with various standards. It is an object of the present invention to provide a body core and a connection structure thereof.

[0009]

SUMMARY OF THE INVENTION A foam core according to the present invention is an elongated member in which an upper member and a lower member are combined and connected, and a lower surface of the upper member is provided in a longitudinal direction of the upper member. Is provided with a fitting portion comprising a concave ridge portion and / or a convex ridge portion continuously formed on the lower member, and a convex ridge portion fitted on a concave ridge portion formed on a lower surface of the upper member on the upper surface of the lower member. And / or a concave portion that fits into a convex portion formed on the lower surface of the upper member. The convex portion is 0.4 to 4 times larger than the concave portion. The upper member and the lower member are combined and combined without using an adhesive by being formed to be 0.0 mm wide.

The concave and / or convex ridges formed on the lower surface of the upper member of the foam core of the present invention and the convex and / or concave ridges formed on the upper surface of the lower member include: When the lower member and the lower member are combined and connected, the concave and convex portions may be fitted to each other, and the upper and lower members may be integrated so as to be hardly displaced.

Here, the concave ridge portion can be formed on the lower member, and the convex ridge portion can be formed on the upper member. Conversely, the convex ridge portion can be formed on the lower member, and the concave ridge portion can be formed on the upper member. You can also.
Of course, the concave ridge and the convex ridge may be formed on the lower member, and the convex ridge and the concave ridge fitted with the concave ridge and the convex ridge may be formed on the upper member.

Further, in the foam core of the present invention, as described above, a spacer material can be provided between the upper member and the lower member. On the upper surface of this spacer material, a ridge or / and / or a concave ridge fitted on the lower surface of the upper member are formed, and on the upper surface of the spacer, a lower ridge is formed. A convex ridge or / and / or a concave ridge that fits into the concave ridge or / and the convex ridge provided on the upper surface of the member is formed.

[0013] The connecting structure of the present invention uses the above foam core, wherein the upper member is disposed to be displaced in the longitudinal direction with respect to the lower member, and the lower surface of one upper member is fitted. The foamed core is connected by combining and joining the joining portion to the fitting portions on the upper surfaces of the two lower members.

As described above, in the foam core of the present invention, the projection width of the ridge portion is 0.4 to 4.
Since it is formed large in the range of 0 mm, a strong connection between the upper member and the lower member can be realized without using an adhesive.

Further, in the connection structure of the present invention, since the foam cores can be firmly connected to each other, the continuous connection of the foam cores due to buoyancy at the time of placing concrete can be achieved. , Will not be impaired. In addition, in the case where the foam core is temporarily installed continuously, even if the mutual positional relationship between the upper member and the lower member becomes inappropriate, the upper member and the lower member are slid with each other. Thereby, the mutual position of the upper member and the lower member can be easily corrected.

Since the foam core of the present invention is formed by combining and joining the upper member and the lower member, the upper core member is made up of a conventional foam core made by molding or foam block processing. By adjusting the thickness of the lower member, the range of height adjustment can be doubled. In addition, if you need a foam core with a higher height,
By using a foam core in which a spacer member is inserted between the upper member and the lower member, the height can be adjusted in a wider range.

As described above, the foam core is integrated, connected, and supported in a concrete form by an appropriate method. Thereafter, the concrete is poured into the formwork, and a strong and lightweight reinforced concrete structure can be obtained without collapsing or the like due to the influence of buoyancy or the like.

The foam core of the present invention can be obtained by the same molding method as that of a normal foam block.
The mold used usually comprises a fixed mold and a movable mold. As this mold, a dedicated mold may be used,
It is also possible to use an existing foam block molding die which is generally used with a simple improvement.

In the case of a dedicated mold, various types of foam cores can be manufactured by providing the fixed mold and the movable mold with a mechanism capable of adjusting the width and height of the upper member and the lower member. it can. Also, when improving an existing molding die, for example, a fixed die is provided with an uneven die mounted on the inner surface in order to provide a fitting portion on the lower surface of the upper member or the upper surface of the lower member,
If necessary, a spacer die for adjusting the width can be provided on the side surface. A master mold having a surface shape corresponding to the shape of the upper and lower surfaces of the foam core is attached to the moving mold, and a spacer mold for height adjustment is provided between the moving mold base and the master mold. It may be provided.

In the master mold, the required width of the foam core is usually 500 mm or less. For this reason, the master mold has a configuration in which (A) an upper member and a lower member can be formed as a pair,
(B) The upper member or the lower member can be formed two at a time. In the case of (A), two upper members or two lower members are provided so that a partition part is provided in the master mold so that the upper member and the lower member are separately formed in the case of (A). As the member is formed as an object,
Can be configured. Also, this master mold
In the case of (A), two upper members or two lower members are connected to each other so that the upper member and the lower member are connected to each other. It can be configured to be molded. In this case, the pair of members or the two members in the connected state may be separated using a jig using a hot wire or the like.

As described above, according to the present invention, the use of the foam core having the above-described structure can improve the construction efficiency and the cost. In addition, unlike the case of processing the foam block, since it is formed by molding, unnecessary cutting chips are not generated, and a product having excellent dimensional accuracy can be obtained. Further, since the molding die can be molded without using a special mold, equipment costs can be reduced. In addition, since the upper member and the lower member are integrated with each other as compared with a normal foam core, a spacer material can be interposed between the upper member and the lower member. The range is wide, and a wide variety of foam cores can be formed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 to 3 relate to a foam core according to an embodiment of the present invention. 1 and 2 (a)
As shown in FIG. 1, the foam core 1 is composed of an upper member 2 and a lower member 3. In this embodiment, the lower surface 2a of the upper member 2
Along the longitudinal direction of the lower member 3, and along the longitudinal direction of the upper surface 3 a of the lower member 3, the convex ridges 5, 5 corresponding to the concave ridges 4, 4. have. Then, the upper member 2 and the lower member 3 are integrated by fitting the respective concave ridges 4 and convex ridges 5 with each other to form the foam core 1 as shown in FIG. 2B. Is done.

The dimensions of the foam core 1 are determined depending on the depth and width of the concrete in which it is buried, the scale of the structure, and the like. When used, the width (W) is about 400-1000 mm,
Height (H) about 200-800 mm, length (L) about 200
It is about 0 mm.

The depth h1 of the ridge 4 is about 10 mm and the width w1
Is about 20 to 50 mm, and the height h2 of the ridge 5 is about 1
0 mm and width w2 are wider than width w1 by about 0.5 to 4.0 mm. As a result, once they are fitted together, they do not come off easily, and their integrity is kept strong.

In this embodiment, the lower side of the foam core 1 is tapered, and the upper corner is chamfered. This is to support the foam core 1 in a concrete form and to promote the flow of the concrete into the entire form when the concrete is poured. The cross-sectional shape of the core can be various shapes such as an ellipse and a pentagon.

The foam core 1 is limited to a length of about 2000 mm due to the size limitation of the molding machine for molding the foam core. They need to be connected in different directions and buried in concrete.

FIG. 3 shows a method of connecting the foam core 1. As shown in the drawing, the foam core 1 has an upper member 2 and a lower member 3 which are connected to each other while being shifted in the longitudinal direction.
And, the concave ridges 4, 4 formed on the lower surface 2a of the upper member 2 exposed by shifting the upper member and the lower member,
The ridges 5, 5 formed on the upper surface 3a of the lower member 3 of the other foam core 1 are fitted to connect the adjacent foam cores 1 to each other. In this case, the connection strength is sufficient for normal use, but if the connection strength is particularly required, the connection portion may be reinforced with a tape or the like. Therefore, it is no longer necessary to use an adhesive or a reinforcing jig to connect the upper member and the lower member as in the related art. The upper member 2 and the lower member 3
By further increasing the amount of shift (for example, by shifting the length of the core to half of the total length) and connecting the cores to each other, a stronger connection is possible.

The protruding portion at the end of the connected foam core 1 is cut using a hot wire or the like. In addition, depending on the length of the connected foam core, an upper member cut in half at one end and a lower member cut in half at the other end may be used depending on the length of the connected foam core. Thus, the yield of the foam core can be improved.

In the present invention, the upper member 2 of the foam core 1
Of the fitting portion provided on the lower surface 2a of the lower member 3 and the upper surface 3 of the lower member 3
The form of the fitting portion provided in a is not limited to that shown in this embodiment, and various forms are conceivable. FIG. 4A shows another embodiment of the fitting portion, in which a projection 5 and a groove 4 are provided on the lower surface 2a of the upper member 2 and the upper surface 3a of the lower member 3, respectively. . In the case of this example, since the lower surface of the upper member is left-right asymmetric, the joining direction of the upper member 2 and the lower member 3 can be specified. In the present invention, a convex ridge may be provided on the upper member 2 side and a concave ridge may be provided on the lower member 3 side, and the number thereof may be one to many.

FIG. 4B is a perspective view showing another embodiment of the foam core of the present invention, in which the upper member 2 and the lower member 3 of the core are provided.
And a spacer member 6 fitted to them. Several types of spacer members 6 having different heights H are prepared, and these are selectively loaded between the cores.
The height of the core can be adapted to several kinds of standard dimensions. The spacer member 6 is formed of a foam,
On the upper surface, a convex ridge 6a fitted to the concave ridge 4 of the upper member 2 is provided, and on the lower surface, a concave ridge 6b fitted to the convex ridge 5 of the lower member 3 is provided. Also in the case of this embodiment,
The upper member 2, the spacer member 6, and the lower member 3 are firmly connected by the respective convex ridges and concave ridges, and the connection between adjacent cores can be performed by the method shown in FIG.

Next, an embodiment of a molding machine for molding the foam core 1 will be described with reference to FIGS. FIG. 5 is a partially cutaway perspective view of the molding machine. In FIG. 5, the molding machine 10 is basically a block-shaped rectangular mold (a fixed mold 11 and a movable mold 13). And the uneven mold 12 and the master mold 1 in the molding die.
4a and a spacer mold 14b. The upper member 2 and the lower member 3 of the foam core 1 are formed in the molding machine 10 by a first space 16 and a second space 16 surrounded by the concave and convex mold 12, the master mold 14a and the partition wall 15.
Each is formed by the space 17.

The concave and convex mold 12 is fixed inside a fixed mold 11, and the molding surface thereof is fitted with the lower surface of the upper member 2 of the foam core 1 to be molded and the upper surface of the lower member 3. A concave ridge portion 12a and a convex ridge portion 12b forming a portion are provided. That is, the shape of the fitting portion provided on the lower surface of the upper member or the upper surface of the lower member of the foam core is determined by the molding surface of the uneven mold 12. Therefore, the uneven mold 12
By changing the shape, it is possible to form a fitting portion having a necessary connection strength suitable for the use of the foam core. In addition, by attaching the spacer mold 15a to the side surface of the fixed mold, it is possible to adjust the width of the foam core.

As described above, the master mold 14a in which the concave and convex ridges are formed so as to conform to (ie, fit with) the lower surface shape of the upper member and the upper surface shape of the lower member.
The upper member and the lower member can be molded by attaching to the movable mold 13 via the spacer mold 14b. in this case,
The master mold 14a may have a shape capable of molding a pair of an upper member and a lower member at one time, or may have a shape capable of molding only two members at a time.

In the molding machine 10 of the present embodiment, the height of the foam core can be adjusted by attaching the spacer mold 14b having a different thickness under the master mold 14a. Further, by attaching spacer molds 15a having different thicknesses to the side surfaces of the fixed mold, the width of the foam core can be adjusted. This enables molding of foam cores having various heights and widths. FIG. 6 shows a spacer mold 14 which is slightly thicker than FIG.
b shows a molding machine 10 using a slightly thinner spacer mold 15a.

The movable mold 13 generally forms a vertical mold with the fixed mold 11, and by moving the movable mold 13 in the horizontal direction, the lid of the mold is opened,
The molded foam core is released from the fixed mold 11.

The fixed mold 11 and the moving surface 13
, Uneven mold 12, master mold 14a, spacer mold 1
In order to attach 4b, fixing means such as bolts are usually employed.

For molding of the foam core, pre-expanded particles, such as polystyrene, are placed in the above-mentioned fixed mold, sealed with a moving mold, and the pre-expanded particles are foamed by the heat of steam. It is performed by After the foaming is completed, the movable mold is moved to take out an integrally molded product of the upper member and the lower member in the fixed mold. By separating the molded product by a cutting method such as a hot wire, an upper member and a lower member of a foam core can be formed. By combining and combining the created upper member and lower member, the foam core of the present invention can be obtained.

FIG. 7 shows a reinforcing bar structure of a subgrade of an elevated road, and the foam core 1 formed as described above.
Are connected in a plurality of longitudinal directions and stored in a space defined by the reinforcing bar 18. The foam core in each section is placed on a pedestal and fixed with a band or the like so as not to be displaced from the pedestal 20 by casting concrete. Since the connection strength between the foam cores of the present invention is improved, it is possible to reduce the number of fixing points as compared with the conventional one.

FIG. 8 is a view showing a reinforced concrete structure in which the foam core 1 is embedded. As previously mentioned,
Such a structure can be precast or constructed on site.

FIG. 9 is a view showing various construction modes of the foam core 1. As shown in FIG. FIG. 3A shows a foam core 1 having the shape shown in FIGS.
FIGS. 3 (b) and 3 (c) also show a state in which the columnar and substantially elliptical foam core 1 is fixed by means of the core 1 and the bolts 22. FIGS. I have.

[0041]

As described above, according to the present invention, the following effects can be obtained. (1) Accurate positioning is possible at the time of construction on site, so that there is no inconvenience such as a decrease in structural strength due to poor positioning as in the related art.

(2) Since the foam cores have a divided structure and are fitted to each other, the connection between the foam cores is strong enough to withstand the pressure during concrete pouring. And the operation can be easily performed.

(3) The molding machine of the foamed core of the present invention can be manufactured using the conventional block molding machine, and the molding of the core can be performed very easily in a short time. High accuracy and good yield.

(4) Several types of foam cores conforming to the standard can be molded by one molding machine.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a foam core according to the present invention in a divided state.

2 (a) is a front view of the foam core of FIG. 1 in a divided state, FIG. 2 (b) is a front view of a combined state, and FIG. 2 (c) is an enlarged view of a lower surface of an upper member and an upper surface of a lower member.

FIG. 3 is a perspective view showing a method of connecting the foam cores of FIG.

FIG. 4 is a view showing another embodiment of a foam core.
FIG. 7A is a front view showing another example of the lower surface of the upper member and the upper surface of the lower member, and FIG. 8B is a perspective view of an example in which a spacer member is interposed.

FIG. 5 is a partially cutaway perspective view of the molding machine according to the present invention.

6 is a perspective view of the molding machine of FIG. 5 when a thin replacement spacer member is used.

FIG. 7 is a perspective view showing a state in which the foam core of the present invention is housed in a reinforcing structure of a subgrade on an elevated road.

8 is an enlarged cross-sectional view of a main part of FIG. 7 showing a support state in the reinforcing steel structure of the foam core.

FIGS. 9A to 9C are views showing various construction modes of a foam core.

[Description of Signs] 1 Foam core 2 Upper member of foam core 2a Lower surface of upper member 3 Lower member of foam core 3a Upper surface of lower member 4 Concave ridge 5 Convex ridge

Claims (2)

[Claims] 1. An elongated foam core in which an upper member and a lower member are combined and joined, and a concave formed continuously on a lower surface of the upper member in a longitudinal direction of the upper member. A fitting portion comprising a ridge portion and / or a ridge portion is provided, and a convex ridge portion fitted on a concave ridge portion formed on a lower surface of the upper member on the upper surface of the lower member; A fitting portion comprising a concave ridge portion fitted to the convex ridge portion formed on the lower surface of the member; and the convex ridge portion is formed to be 0.4 to 4.0 mm wider than the concave ridge portion. By doing so, the upper member and the lower member,
A foam core, which is combined and bonded without using an adhesive. 2. A connection structure using the foam core according to claim 1, wherein an upper member of the foam core is displaced in a longitudinal direction with respect to a lower member, A foam core is connected by combining and fitting a fitting portion on a lower surface of one upper member to a fitting portion on an upper surface of two lower members. Connection structure.