JPH10298918A - Form for filling concrete of slab bridge girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of the work, and reduce the cost of the work by using only two kinds of forms manufactured of the synthetic resin in which the leachate from the concrete is stopped by making use of the slight force against the deformation corresponding to the shape of a bridge girder, the work is efficient by reducing the weight of the form, the elastic force to suppress generation of the permanent deformation and distortion is kept, and a gap present between slab pier is covered with a bottom part by the deformation force when the slight external force is applied. SOLUTION: A gutter type groove-shaped form 11 in which inclined support plates 13, 13 to be engaged with an inclined wall of a lower base piece of a slab bridge girder are extended from each side edge of a flat bottom plate 12, is formed of the resin material. In the support plate 13, an upwardly projected curved part 16 of sharp curve is continuously connected close to the tip, and a recessed curved part 17 of gentle curve is continuously connected to the flat bottom plate in a corrugated manner on the whole, and strip-shaped packings 14, 15 are mounted on the tip part on the outer side of the support plate 13 and the continuously connected part of the recessed and projected curved parts 17, 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab bridge formed between parallel and parallel slab bridges. The present invention relates to a gutter-type groove-shaped formwork to be installed in a minimum gap portion to be formed.

[0002]

2. Description of the Related Art By embedding a lower end foundation deep in the soil,
One end or an intermediate portion is supported on a crosspiece formed in the upper part of each pier of the pier group of piers erected at a predetermined interval and corresponding to the road width direction, and extends in accordance with the extending direction of a road or the like. A large number of bridge girder groups are mounted with increasing or decreasing the number of parallel juxtapositions according to the size of the road width or the like, and connecting between the piers.

[0003] The bridge girder is classified into a slab bridge girder and a girder bridge girder according to the shape of each girder. The formwork according to the present invention is mainly used for the slab girder.
The slab bridge girder is formed integrally with a pair of base pieces extending on both lower sides of the bridge main body over the entire length of the bridge girder for the stability thereof, and the base piece is an inclined wall descending outward and downward. And a vertical wall following it.

[0004] Concrete is poured into the gaps left between the slab bridges in parallel at predetermined intervals and then filled with each slab bridge and up to the top surface of the bridge. Asphalt and the like are laid on the entire surface of the cast concrete.

Prior to placing concrete in the gap of each slab bridge, the bottom of the gap between a pair of juxtaposed and adjacent slab bridges is opposed to each other in order to prevent accidental dropping of concrete. A concrete casting formwork is installed in advance so as to be engaged with the inclined wall surfaces of the pair of base pieces.

[0006] There are various types of this formwork for closing the bottom portion of the gap left between the slab bridges, and an upwardly curved arch-type fitting that positively utilizes the inclined wall surface of the base piece. Mold, gutter-type V-shaped gutter type of end-expanded V-shape, and a gutter type integrally provided with a flat bottom plate at the center and a pair of inclined plates that open and extend obliquely upward from both side edges in the plan view. There is a groove type and the like.

[0007] It is difficult to remove these molds after installation and subsequent concrete casting, and it is required to have sufficient strength and durability to withstand the concrete casting work. In order to satisfy this demand, a 0.8 mm thick steel plate form plate subjected to galvanization is mainly used as a gutter type groove form form of a slab bridge.

[0008]

However, the steel sheet form is naturally heavy, and causes permanent set during handling.
Also, it is difficult to determine the deformation along the form of the bridge on the form due to the rigidity of the form itself at the time of or after the concrete is poured, and as a result, a gap is required between the form and the bridge. There is an inconvenience that the moisture contained in the concrete oozes out of the gap with the passage of time, and furthermore, rust is generated on the formwork itself. Furthermore, in order to cope with the change in the gap width between the parallel slab bridges due to the fixedness of the steel sheet form, there is also the inconvenience that several types of forms must be prepared.

According to the present invention, a slab bridge is used as a bridge placed between bridges that are erected, and the bottom of each gap left between the slab bridges in a parallel state is closed. The present invention is limited to the case where a gutter-type groove is used as a concrete casting formwork as a member to be disposed in the apparatus.

[0010] The present invention greatly improves the above-mentioned inconveniences and problems inherent in the steel plate form, that is, it uses a synthetic resin material as the form and has a certain degree of shape corresponding to the shape of the bridge. The ability to stop the seepage of concrete from concrete, improve the efficiency of work associated with the reduction of formwork, maintain elasticity to prevent permanent deformation and distortion, and maintain a certain level of external force. Due to the deformation force at the time of addition, the blockage at the bottom of the gap existing between the slab bridges can be covered with only two types of formwork, and this can be covered, thereby improving work efficiency and reducing work cost. The purpose is to realize the following.

[0011]

In order to achieve the above object, the present invention employs the following arrangement. The gutter-type groove-type formwork according to the present invention is a strip-shaped flat bottom plate that receives a load of concrete, and an inclined wall surface of a base piece that extends at a lower end portion of a slab bridge girder extending diagonally from both side edges of the plate. And a pair of inclined support plates which can be locked to each other. These are integrally formed of a synthetic resin material.

The inclined support plate of the formwork has an upwardly convex curved portion connected to a portion near the front end thereof, and a concavely curved portion upwardly connected to the flat bottom plate near the flat bottom plate to prevent external load. In order to obtain a certain degree of deformability, a waveform is formed as a whole, and the connecting portion of the concave and convex curved portion and the outer surface of the distal end portion have a Shore A hardness of 60 over the entire length of the bearing plate.
A soft band-like packing of ° -70 ° is attached.

The upwardly curved portion of the inclined support plate is formed with a sharp curve having a small radius of curvature whose center point is found outside the support plate, while the concavely curved portion is formed inside the support plate. The point is determined and formed with a gentle curve of about four times the radius of curvature of the convexly curved portion, and the sharply curved convexly curved portion exerts a larger deformation force when an external load is applied.

The strip-shaped packing position mounted on the outer surface of the connecting portion of the bilaterally curved portion constituting the inclined support plate is located at substantially the middle of the horizontal length of the inclined support plate. With the packing attached to the bridge, it always maintains its contact force firmly on the bridged surface, ensuring the effectiveness of the water stopping effect.

In the above-mentioned formwork, the thickness of the strip-shaped flat bottom plate and the cross-sectional thickness in the vertical direction of the inclined support plate are set to be substantially the same, which means that the plate thickness of the inclined support plate is flat. It is naturally formed to be thinner than the plate thickness, so that when the concrete load acts on the inclined support plate from above, along the bridge girder, more specifically, along the inclined wall surface of the base piece forming a part of the bridge girder Therefore, the belt-shaped packing is more securely deformed, and thereby the pressure-contact of the base piece of the strip-shaped packing to the inclined wall surface is further strengthened.

In the inclined support plate exhibiting the entire waveform, the thickness of the connecting portion between the concave and convex curved portions is formed to be the thinnest in the mold, whereby the flexibility at the connecting portion is maximized, and the belt-like shape is formed. The packing is pressed against the bridged surface, which further enhances the water stopping effect.

[0017]

Embodiments of the present invention will now be described with reference to the drawings. One group of the slab bridge girder is juxtaposed and juxtaposed on the cross beam 7 of the pier 6 erected at a predetermined pitch (see FIG. 8). With respect to this group of slab bridges, specific numerical values such as a pair of slab bridges in parallel and a gap left between both bridges are defined by JIS standards.

That is, as shown in FIG. 7, the arrangement gap (P) between the pair of slab bridges 1, 1 is 710 to 770 mm.
The upper gap (Q) between the folded main bodies 1 and 1 is 70 to 130 m.
m, the width of the base pieces 2 and 2 extending from the lower side surfaces of the bridged main body 1 from the main body 1 is 30 mm, and the sloped wall 3 of the down sloped wall 3 and the vertical wall 4 forming the base piece 2 is formed. The inclination angle (θ) is defined as 45 °, and the minimum lower gap (S) between the vertical walls 4, 4 of the pair of bridge base pieces is defined as 10 to 70 mm.

The entire form of the concrete form 11 for stuffing concrete of the slab bridge 1 according to the present invention has a band shape, and is installed near the bottom of the gap between the parallel slab bridges 1 and 1. The formwork 11 extends obliquely outward from both side edges of the flat bottom plate 12, which are locked to the flat bottom plate 12 that closes the gap and the inclined wall 3 of the base piece 2 that extends below the bridge 1. It is a so-called gutter-type groove-type formwork which is constituted by integrally forming a pair of inclined support plates 13 and 13 which are protruded (see FIGS. 1 and 2).

The mold 11 is made of a thermoplastic resin material, for example, hard vinyl chloride, polypropylene, polyethylene or the like, preferably hard vinyl chloride (PVC) resin because of its durability, elasticity and rigidity. The pair of bearing plates 13, 13 are formed to be slightly thinner than the flat bottom plate 12, and thus have a certain degree of deformation tolerance.

A pair of bearing plates 13, 13 are provided at the tip and middle positions on the outer surfaces with a Shore A hardness of 60 ° to 70 ° having a semicircular cross section over the entire length of the bearing plate 13, for example, soft vinyl chloride. (PVC), band-shaped waterproof packings 14 and 15 made of polyurethane, rubber, or the like are bonded by bonding means, or a rigid vinyl chloride resin flat bottom plate 12 and a pair of support plates 13 and 13 and a rigid vinyl chloride resin packing 14 When all of 15 are made of a vinyl chloride resin, the entire mold including the packing is integrally formed by extrusion molding.

In the folding of the extrusion integral molding, the support plate 1
3 and the band-shaped packings 14 and 15 maintain their adhesive strength, and the main molding is expected to lead to cost reduction and secure uniform physical properties.

The formwork 11 is formed by the weight of concrete cast from above in the gap between the parallel bridges 1 and 1. In particular, the pair of support plates 13 and 13 are formed by tilting the base piece 2 of the bridge. It is configured to deform along the wall 3 to enhance a certain degree of flexibility and a water stopping effect.

That is, each of the support plates 13, 13 has a small radius of curvature (T) at the portion near the tip thereof.
A convex curved portion 16 having a sharp curve having a large curvature radius and a gentle curved concave portion 17 having a large radius of curvature (U) are formed in a series below the flat bottom plate 12. The inclined support plates 13, 13 are constituted by both curved portions 16, 17, and have a waveform as a whole (FIG. 1).
And FIG. 2).

More specifically, the sharply curved convexly curved portion 16
Means that the radius of curvature (T) whose center point is set outside the bearing plate 13 of the form is 15 mm, while the concave curved portion 1 having a gentle curve
7, a radius of curvature (U) corresponding to four times the radius of curvature of the convexly curved portion 16 having a center point set inside the support plate 13 and having a radius of curvature of 60 mm, The band-like packing 15 is mounted on the outer surface of the connecting portion between the concave and convex curved portions 17 and 16 (see FIGS. 1 and 2).

The load of the concrete poured into the gap between the bridges 1, 1 is mainly concentrated on the flat bottom plate 12 of the formwork 11, and the two inclined support plates 13, 13 are inclined on the base piece 2 of the bridge. Since it is supported by the wall 3, the concrete load acts on the support plate 13 obliquely upward, and the flat bottom plate 1
2, the thickness of the support plate 13 at the oblique section (X) extending vertically from the flat bottom plate 12 surface is:
The thickness of the flat bottom plate 12 is substantially the same as the thickness of the flat bottom plate 12. The thinning of the inclined support plate 13 makes the deformation of the support plate itself to some extent easier, and the unevenness curved portion 17 constituting the support plate is formed. , 16 in the vicinity of the connecting portion are formed to be the thinnest,
This makes the deformation of the bearing plate 13 easier at this point (see FIGS. 1 and 2).

While being made of a hard resin material,
The bearing plate 13, which has a relatively large tolerance for deformation, is capable of deforming along one bridging surface centered on the base piece 2 because it can absorb the gap width between the parallel bridging beams.
According to the IS standard, the gap (S) derived between the base pieces 2 and 2, which is the minimum gap of the slab bridge, is set to be within the range of 10 to 70 mm.
The width of the flat bottom plate 12 of the mold 11 corresponding to
1 and the width of the flat bottom plate 12 corresponding to a gap of 45 mm or less is set to 2 mm.
Type B shown in FIG. 2 set to 4 mm and 1.5 mm thick
With only two types of formwork, the installation gap of the slab bridge girder that changes can be absorbed and dealt with.

The maximum specific gravity of concrete is 2.5 g / cm.
³ Based on this value, the maximum load of the concrete which the flat bottom plate 12 of the formwork 11 receives is, of course, when the gap of the bridge is 70 mm, and the concrete height is 93 mm.
The maximum load for folding set to 1 cm x 1 cm x 93 cm
cm × 2.5 g / cm ³ ≒ 1.63 kgf / cm.

In the case of the slab bridge girder 1 with a gap of 70 mm, which is the most severe condition, various gutter-type forms cannot withstand the load of concrete when the bridge girder is bridged. It is as follows. ◎ Gutter type V-type steel plate mold with 0.8 mm thickness ・ ・ ・ ・ ・ ・ ・ ・ ・ About 1.8 kgf / cm ◎ Gutter type V-type steel plate form with 1.0 mm thickness ・ ・ ・ ・ ・ ・··· Approximately 3.0 kgf / cm ◎ Invention type A frame made of hard PVC lacking packing ··· About 2.2 kgf / cm ◎ Invention type A frame made of rigid PVC and fitted with packing ··· About 2.4 kgf / cm

From the above experimental results, the type A formwork of the present invention, particularly the formwork equipped with two band-shaped packings, has a maximum static load of 2.4 kgf / cm, which is larger than the maximum static load of concrete of 1.63 kgf / cm. The flat bottom plate 12 is made of a hard vinyl chloride (PVC) resin, and the plate thickness is 2.5 m.
By setting m, it was possible to obtain a formwork having a load resistance higher than that of a 0.8 mm thick steel plate formwork conventionally used.

In the case of the type B formwork which is in charge of the case where the gap of the slab bridge is 45 mm or less, the maximum load applied to the flat bottom plate portion of the formwork is 1 cm × 4.5 cm × 93 cm × 2.5 g / cm. ² ≒
1.05 kgf / cm 2. Naturally, in comparison with the type A formwork which copes with the most severe situation, the flat bottom plate can be thinner and the type B formwork can be used. As a result of the experiment, it was possible to sufficiently cope with a plate thickness of 1.5 mm.

Since the inclined support plates 13 of the form 11 are always in contact with the inclined wall 3 of the base piece 2 of the bridge 1, the same load resistance as the flat bottom plate 12 of the form is required. However, the cross section thickness (X) in the vertical direction of the support plate 13 is set to be approximately 2.5 mm so that the support plate 13 is not deformed or distorted when the molds 11 are stacked.

As a result, the thickness of the inclined support plates 13, 13 is naturally made thinner than the thickness of the flat bottom plate 12 of the mold.
The sharply curved convexly curved portion 16 constituting an inclined support plate
In addition, the thickness of the connecting portion between the two curved portions of the concave curved portion 17 having a gentle curve is particularly thin, so that the deformation at the connecting portion becomes easy, and as a result, the bridged base piece 2 of the support plate 13 is formed. The deformation along the surface of the inclined wall 3 is easy.

Although there is a concern that water in the concrete will seep out over time from the gap formed between the slab bridge girder 1 and the formwork 11, the inclined support plate 1 of the formwork 11 of the present invention.
The presence of the band-shaped packings 14 and 15 having a semi-annular cross section attached to the front end portion 3 and the outer surface of the connecting portion of the uneven curved portions 17 and 16 respectively indicates the linear sealing property between the bridge and the support plate of the formwork. In particular, when the load of the concrete strongly acts on the support plate and the pressing deformation of the band-shaped packing, the tightness of the gap can be made stronger.

The sealing performance required of the two band-shaped packings 14 and 15 is such that the surface of the concrete bridge girder is rough and the presence of the packing having a Shore A hardness of 60 ° to 70 ° depends on the outer wall surface of the formwork. The water stop effect is made more effective by the double guard.

Further, the two band-like packings also have an effect of preventing the form from slipping off from the bridged surface of the formwork itself, and as specifically disclosed in the above-mentioned experimental results, a resin-made package lacking the band-like packings. The load capacity of the formwork is 2.2kgf
/ Cm, but the load-bearing capacity of the formwork in which the present invention is mounted with two strip-shaped packings is 2.4 kgf / cm, as clearly shown by the numerical value. saw.

The contact portion of the formwork 11 with the inclined wall 3 of the base piece 2 of the bridge 1 is mainly made of band-like packings 14,15.
Therefore, if it can withstand the load of cast concrete, it is not necessary to install a formwork above the base piece 2 of the bridge girder, and two strip-shaped packings are located on the inclined wall surface of the base piece. Is sufficient, and the amount of extension of the base piece 2 in the horizontal direction from the main body of the slab bridge is set to 30 mm in JIS standard.
The horizontal interval between the two band-shaped packings mounted on the base 3 is set to 14 mm.

Since the narrowest gap of the slab bridge, that is, the gap between the pair of base pieces is set in the range of 10 to 70 mm according to JIS standard, it is approximately 45 m which is a substantially intermediate gap.
m or more, the thickness of the flat bottom plate 12 of the formwork in charge of the case of 2.m or more.
The thickness of a flat bottom plate 12 of a type A formwork (see FIG. 1) in which the width of the flat bottom plate is set to be as large as 5 mm and the width of the flat bottom plate is set to 49 mm, and a case in which the load of concrete is relatively small is 45 mm or less. Type B formwork set as small as 1.5 mm and width of flat bottom plate set at 24 mm (see Fig. 2)
With only two types of molds, it was possible to cover all gaps formed by slab bridge girder.

[0039]

According to the present invention, a gutter according to the present invention is formed by integrally forming a flat bottom plate and an inclined support plate extending obliquely from both side edges thereof for receiving concrete to be cast in a gap portion of the parallel slab bridge girder. By forming the mold itself from a resin material, the grooved formwork has various aspects of the effects that are required on the formwork such as light weight, durability, rust prevention, elasticity, and manufacturability. Can be used.

More specifically, in comparison with the conventional steel plate form, the 1 kg / m steel form is 420 g / m in the resin form, and a weight reduction of about 58% is realized. Accordingly, workability is easy in various directions.

Also, the inclined support plate of the mold is formed by connecting the convexly curved portion and the concavely curved portion to form a waveform as a whole.
Due to the load of the concrete to be cast, the bearing plate is easily deformed along the sloped wall of the bridge girder base, and the deformation of this bearing plate is transferred to the bridge girder base of the two band-shaped packings mounted on the support girder. And make the crimping of
As a result, it is possible to more reliably stop water seeping out of concrete.

The deformation tolerance of the inclined support plate having the corrugated structure forming the formwork is well adapted to the change in the gap of the slab bridge, and the bridge is set in the range of 10 to 70 mm according to the JIS standard. For the gap change, 45mm, which is almost the middle of the gap width, is used as the responsible section, and large and small, that is, only two types of molds, that is, type A and B form, absorb the gap change of the bridge girder. By responding, it was possible to reduce costs and improve work efficiency.

Further, the two band-shaped packings mounted on the outer surface of the inclined support plate at a predetermined interval can make the waterproof effect accompanying the deformation of the support plate stronger, and furthermore, the presence of this packing Promotes stable placement of the formwork in the bridged gap.

The larger the gap of the bridge, the greater the load of concrete on the formwork that blocks the gap below, especially on its flat bottom plate. Therefore, by changing the plate thickness of both the type A and the type B which are exchanged according to the size of the gap, the cost of the material for forming the form is reduced.

[Brief description of the drawings]

FIG. 1 is an end view of a large (type A) gutter channel formwork embodying the present invention.

FIG. 2 is an end view of a small (type B) gutter channel formwork embodying the present invention.

FIG. 3 is a cross-sectional view of a type A formwork set on a base piece on a slab bridge with a gap of 70 mm.

FIG. 4 is a cross-sectional view of a type A formwork set on a base piece on a slab bridge with a gap of 45 mm, and the right partial view particularly shows concrete casting.

FIG. 5 is a cross-sectional view of a type B form set folded on a slab-bridged base piece having a gap of 45 mm.

FIG. 6 is a cross-sectional view of a form B in which a type B formwork is installed on a base piece on which a slab bridge having a gap of 10 mm is installed, and particularly, a right partial view shows a state where concrete is poured.

FIG. 7 is an explanatory diagram of numerical standards of slab bridge girders mounted in parallel with a gap defined by the JIS standard on the pier side rail.

FIG. 8 is a schematic perspective view of a part of a group of slab bridge girder mounted side by side on a cross rail of a pier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Formwork 12 Flat bottom plate 13, 13 Inclined support plate 14 Belt packing 15 Belt packing 16 Convex curved part of sharp curve 17 Concave curved part of gentle curve

Claims (6)

[Claims] 1. A gutter-type groove-shaped formwork made of synthetic resin in which a band-shaped flat bottom plate and an inclined support plate extending from both sides thereof are integrally formed. A slab bridge-filled concrete in which a convex curved portion is formed into a waveform in which a concave curved portion is connected to a flat bottom plate, and a band-shaped packing is attached to a connecting portion of the uneven curved portion and an outer surface of a tip portion. Formwork. 2. In the inclined support plate, the upwardly curved portion has a sharp curve with a small radius of curvature, while the concavely curved portion has a gentle curve with a radius of curvature approximately four times that of the convexly curved portion. The form for concrete for concrete filling of a slab bridge according to claim 1, wherein 3. The slab bridge according to claim 1, wherein the band-shaped packing position mounted on the outer surface of the connecting portion of the uneven curved portion is located substantially at the middle of the horizontal length of the inclined support plate. Formwork for stuffed concrete. 4. The flat bottom plate in a strip shape and the cross-sectional thickness in the vertical direction of the inclined support plate are set to be substantially the same, whereby the inclined support plate is set to be thinner than the flat bottom plate. 1
3. The formwork for thinned concrete of the slab bridge girder according to any one of the items 1 to 3. 5. The stuffed concrete of claim 1, wherein the thickness of the connecting portion of the bilaterally curved portion constituting the inclined bearing plate is formed to be the thinnest in the formwork so as to be easily deformed. Formwork. 6. The minimum gap is set in the range of 10 to 70 mm by JI.
The formwork installed in the gap portion of the slab bridge girder specified in S has a gap of the bridge girder of 45 mm or more.
And a gap 4 with a wide and flat bottom plate
6. A slab bridge girder according to claim 1, wherein the slab is formed of two types of forms, each having a thickness of 1.5 mm and a narrow bottom plate having a width of less than 5 mm. Formwork.