JP2000290935A - Form timbering structure of haunch part of bridge floorboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of cement paste at placing time, to secure construction work, and to increase efficiency by arranging a telescopic auxiliary form in a concrete floorboard form to be formed on a bridge girder, and bringing the auxiliary form into close contact with clearance of a form joining part. SOLUTION: A sub-form 23 having an auxiliary form 22 telescopic in the width direction is installed between a flange haunch part 3 of a main girder and a form 15, and an inclined face 20 is formed in a step difference part of the flange haunch part 3 and the form 15. In this case, the width direction is adjusted by a long bolt 24 and a nut 25, and unevenness with the flange haunch part 3 is adjusted by a push-up bolt 32. The auxiliary form 22 and the sub-form 23 are brought into close contact with both sides forms to prevent the sub-form 23 from being deformed by a load of concrete to thereby prevent leakage of cement paste at concrete placing time, to prevent a stain of a web of the main girder, and to accurately and inexpensively form a floorboard.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the field of structural technology for form supports used in the construction of concrete slabs for bridges such as decimal girder.

[0002]

2. Description of the Related Art It is clear that the recent improvement in citizens' lives is supported by the rise of industrial society, and the rise of the industry is carried out by various industrial facilities constructed throughout the country. Railways and roads are indispensable for transporting conventional facilities between industrial facilities scattered throughout the country.

[0003] In particular, roads can be transported directly from door to door from industrial facility to industrial facility, so that roads are laid all over the country because of the ability to transport goods and human resources. Road networks are steadily laid nationwide in the future. It is expected to be.

[0004] As is well known, the terrain of Japan is occupied by many mountain forests and is in a special geographical location close to a long and intricate coastline.
Arterial roads are indispensable for tunnel and bridge facilities.

[0005] Of these, most of the bridges are of the type in which a concrete floor slab is provided between the main girders arranged on the piers. Therefore, not only bridges of this kind with a small number of main girder types, but also bridges with general concrete slabs, the tensile stress generated on concrete slabs near the main girder of concrete cast between main girder is As shown in FIG. 5, a haunch part 4 fixed by a predetermined length is formed from the upper floor slab 3 of the main girder 1 of the concrete 2 to be cast between the main girder 1 for the purpose of reducing the occurrence of cracks. It is usually done.

When forming a concrete floor slab, a floor slab form is used, but as shown in FIG. The concrete 2 is cast on the upper surface, but in the haunch portion 4, a wooden piece is formed from the end of the formwork 5 on the main girder side to the end of the flange 3 of the main girder 1. The formwork 6 was fitted in the meantime, and the continuous concrete 2 was poured into the haunch portion 4.

However, when the bridge is constructed, the distance between the end of the flange 3 of the main girder 1 and the end of the floor slab 5 is constant due to errors in installation and construction. Therefore, the interval must be measured, and the wooden form 6 must be cut each time, and the wooden form 6 fitted between the form 5 and the flange protruding corner 3 of the main girder 1 must be measured. Due to the strength and rigidity of the formwork 6, as shown in FIG. 7, the wooden formwork 6 bends due to the weight of the concrete between itself and the flange 3. In addition to this, the cement paste 2 'leaks out and the cement paste 2' attached to the main girder 1 must be removed and cleaned after construction. Inefficiency, resulting in product failure,
There is a disadvantage that the reliability of the product is lost and the cost is high.

To cope with this, for example, a wooden form 6
There is also a work of attaching tape or the like to the joint of the flange 3 and the work. However, since this work is a kind of auxiliary work, it is difficult to expect the accuracy of the work with perfect accuracy. Paste work is poor and cement paste 2
There was also an inconvenience that leakage of ′ was inevitable.

[0009]

It is an object of the present invention to provide a technical problem to be solved in order to solve the problems of molding failure of a haunch portion of concrete casting and leakage of cement paste 2 'on a bridge having a concrete slab. Using the advantage of assembling by connecting with each other through the bolts of the metal formwork, the auxiliary formwork with the starting end ridge of the haunch part as the cover part is provided on the sub formwork for the haunch part and the main formwork. Even if mounting errors occur in the gap between the formwork and the flange of the main girder,
Between the worker and the flange through the long bolt, securely prevent the cement paste 2 'from leaking out at the haunch, perform concrete placement efficiently, and press the end of the form receiving beam. By installing bolts, forcibly deforming the tip of the formwork beam in advance to offset the deflection due to concrete load, preventing misalignment between the sub-form and the upper flange of the main girder, and constructing the haunch part It is intended to provide an excellent formwork support structure for a haunch portion of a bridge deck slab, which is beneficial to the application field of bridge construction technology in the construction industry.

[0010]

In accordance with the above-mentioned object, the construction of the invention of the present application, which has the features of the above-mentioned claims, is based on the above-mentioned formwork of the general part of the concrete slab, and the upper flange of the main girder coming out of the upper flange. In the formwork support structure of the haunch part of the bridge slab having the haunch part adjusting formwork, the subforme is formed from the end of the main formwork of the formwork of the general part to the upper flange protruding corner of the main girder. So that the upper surface is connected smoothly, and the upper and lower molds are allowed to come into close contact with the upper flange protruding corners via long bolts from the main mold to the sub mold. An auxiliary form having a flange that can be covered from the end of the form to the start of the sub form is connected via the long bolt, and the upper form of the auxiliary form is The ridge of the haunch is formed on the The other base is that a push bolt is interposed from the main girder side end of the form receiving beam provided to the back surface of the upper flange of the main girder, and in this aspect, A technical measure is adopted in which the upper corner of the end of the sub-mold and the upper corner of the flange of the main girder have a function of being able to adhere to each other.

[0011]

In the construction described above, when constructing a bridge having a concrete floor slab of a small number of main girder types or the like, the concrete slab to be cast between the main girders has a haunch portion, but the mold for the concrete to be cast is not required. The frames are joined to each other with a predetermined area by sewing the unit form to each other, and the auxiliary form having the ridge line of the haunch part on the upper surface is provided near the main girder of the form, and the sub form is connected to the main form by the bolt. The cement paste is inserted between the sub-form and the flange of the main girder while placing concrete while adjusting the space between the flange protruding corners as closely as possible. Due to the tight joints, there is no leakage, no post-cleaning, no need for sealing, etc., and the end of the beam supporting the formwork near the main girder is Provide a push bolt for the back side of the spar flange, Because, in addition forced deformation at the tip of the mold receiving beam to prevent tongue and groove of the flange on the secondary mold and the main girder by offsetting the deflection by concrete load,
There is no additional work such as post-cleaning of the spilled concrete, so the construction efficiency is good and the cost is low.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG.

It is to be noted that the same parts as those shown in FIG.

The embodiment shown in FIG. 1 shows a concrete floor slab forming work for a bridge of a few main girder types.

In contrast to the construction of the haunch portion 3 of the concrete slab 2 which is an important point of the gist of the invention of this application, the structure of the shoring 14 is an enlarged portion of FIG. As shown in FIGS. 3 and 4, the formwork of the general part between the haunch parts 4 and 4 for the concrete floor slab is made of steel as shown in FIGS. The dish-shaped main form 15 has sewing bolt holes 16 and is formed to have a predetermined area with each other.
2 has a ridge line 18 of the haunch portion on the surface, has a flat portion 19 connected to the main formwork 15 at the same level, and has an inclination angle θ of the set haunch portion from the ridge line 18 as shown in FIG. The auxiliary formwork 22 is connected to the auxiliary formwork 22 at the start end of the sub formwork 23 having the inclined surface 20, and a sewing bolt hole 16 corresponding to the bolt hole of the main formwork 15. And a sub-form 23 corresponding to the haunch portion
The sewing bolt hole 16 is also formed on the surface corresponding to
The sub-form 23 is covered by the flange 21 on the upper side of the auxiliary form 22, and its tip is securely provided between the end of the sub-form 23 and the main form 15 and the flange 3. The haunch portion can be reliably covered on the upper side even if the gap has some mounting error.

Then, the long bolts 2 are inserted into the sewing bolt holes 16, 16, 16 of the main mold 15, the auxiliary mold 22, and the sub mold 23.
4 is fastened and connected via a nut 25.

The three main frames 15, the auxiliary frame 22, and the sub-frame 23 are connected to each other by bolts 16, 16, 16,... As shown in FIG. 3 and FIG.
Through the long bolt 24 and nuts 25
The sewing bolt hole 16 of the sub-form 23 is externally inserted into a portion of the long bolt 24 protruding toward the main girder 1, and the nut 25 is connected and integrated.

At this time, the flange 2 on the upper surface of the
1 overlaps with the upper surface of the end of the sub-form 23, the corner of the sub-form 23 and the corner of the flange 3 of the main girder 1 are tightly closed as shown in FIGS. Even if the flanges 3 are in close contact with each other, even if the gap between the flange 3 and the main formwork 15 or the auxiliary formwork 21 has an error only in a minute space, the concrete covered by the flange 21 and cast into place. There is no possibility that the cement paste 2 ′ leaks out of the gap between the sub-form 23 and the flange 3 and the gap between the sub-form 23 and the auxiliary form 22.

It is not necessary to perform a sealing operation or the like in the gap between the sub-form 23 and the flange 3 or in the gap between the auxiliary form 22 and the sub-form 23.

In the above configuration, when concrete is poured into the haunch portion 4 of the concrete slab,
The auxiliary formwork is mounted on the cross beam 12 and provided at the upper part of the form support beam 30 and sewn to each other by bolt stitching. 22 and a sub-form 23 near the main girder 1 of the auxiliary form 22.
Is set, and through a long bolt 24 and a nut 25,
The haunch part is set so as to undercover, and a push bolt 32 is screwed into a bracket 31 previously fixed to the main girder 1 of the form receiving beam 30 in the meantime. Of the sub-form 23
And tightly contact with each other so that there is no difference between the gap and the flange 3.

Then, the flange 21 of the auxiliary mold 22 is covered on the upper surface of the sub mold 23 on the side opposite to the main girder 1 to complete the preparation.

At this time, the tight connection between the auxiliary mold 22 and the sub mold 23 is made as scheduled by adjusting the nuts 25, 25 with respect to the long bolts 24.

When the concrete 2 is cast on the formwork, there is no gap such as misalignment at the joint between the sub-form 23 and the flange 3 as in the prior art.
Is prevented from leaking, and the web of the main girder 1 is not stained, so that there is no need for a subsequent auxiliary cleaning operation or the like.

In order to prevent the sub-form 23 from bending due to the gravity of the cast concrete in the haunch portion, the tip of the form receiving beam 30 is raised by the amount of deflection caused by the concrete load. It is forcibly deformed by being pushed down by the push bolt 32 to offset the deflection caused by the concrete load, thereby preventing misalignment between the sub-form 23 and the main girder upper flange 3 and deforming the movable form of the haunch 4. There is no danger of occurrence, etc., and the concrete floor slab is surely cast including the haunch portion 4 as designed.

It should be noted that the embodiment of the present invention is not limited to the above-described embodiment, and various forms such as using a plurality of long bolts 24 in the bridge axis direction can be adopted.

[0026]

As described above, according to the invention of this application, the flange of the main girder and the end of the formwork which have conventionally been a neck in forming a concrete floor slab such as a bridge of a few main girder type. Of the cement paste 2 'in the haunch portion is eliminated, an accurate concrete slab can be formed as designed, and an excellent effect of increasing the reliability of the bridge is exhibited. .

Also, a push bolt is provided in the vicinity of the main girder of the form receiving beam, and forcible deformation is applied to the tip of the form receiving beam in advance to offset the deflection due to the concrete load, thereby making the sub-form and the main girder. To prevent misalignment with the upper flange, thus preventing leakage of cement paste from this point,
An excellent effect that an accurate concrete floor slab can be formed as designed can be obtained.

Further, for the main formwork connected to the predetermined area,
By connecting the sub-form to the corner of the flange of the main girder via long bolts, if the spacing between the flange of the main girder and the main form has an installation error due to construction, The difference between the auxiliary form and the sub form is achieved by absorbing errors, etc., and the flange of the auxiliary form provided on the main form via a long bolt also covers the upper surface of the base end of the sub form. Therefore, an excellent effect that the cement paste is prevented from leaking from the misaligned portion is provided.

[0029]

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a main body of the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of FIG.

FIG. 3 is an enlarged partial sectional view of FIG. 2;

FIG. 4 is an assembled perspective view of a movable mold.

FIG. 5 is a partial sectional view of a general mode of a haunch portion.

FIG. 6 is a sectional view of a wooden formwork of a haunch portion according to the prior art.

FIG. 7 is a side view of a mode of leakage of cement paste from the wooden form.

[Explanation of symbols]

 2 Concrete floor slab 1 Main girder 3 Flange haunch part 23 Preparing formwork 5 Formwork bridge floor slab 13 Shoring 23 Secondary formwork 24 Long bolt 21 Flange 22 Auxiliary formwork 32 Push bolt

[Procedure amendment]

[Submission date] April 8, 1999 (1999.4.8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4 ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 9, 1999 (1999.4.9)

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 3

FIG. 4

[Procedure amendment]

[Submission date] June 17, 1999 (1999.6.1
7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Sugimoto 2-5-37 Kaminishi, Hirano-ku, Osaka-shi, Osaka Asahi Industry Co., Ltd. F term (reference) 2D059 AA14 DD08 DD15 GG55

Claims (4)

[Claims] In a formwork supporting structure of a haunch portion of a bridge slab having a haunch portion adjusting formwork from a formwork of a general portion of a concrete floor slab to an upper corner of a main girder, a main portion of the general portion is provided. The sub-form is smoothly arranged from the top surface from the end of the form to the upper flange protruding corner of the main girder. From the main form to the sub-form, a long bolt is interposed, and A formwork supporting structure for a haunch portion of a bridge floor slab, characterized in that the sub-form is freely abuttable. 2. An auxiliary mold having a flange which can be covered from the end of the main mold to the start of the sub-mold is provided with the long bolt. 1. A form support structure for a haunch portion of the bridge floor slab according to 1. 3. The structure for supporting a formwork of a haunch portion of a bridge floor slab according to claim 2, wherein a starting edge of a slope of the haunch portion is formed on an upper surface of the auxiliary formwork. 4. A form support structure of a haunch portion of a bridge slab having a haunch portion adjusting form from a formwork of a general portion of a concrete slab to an upper corner of a main girder. The sub-form is smoothly disposed from the upper surface from the end of the main form to the upper flange of the main girder, and the main girder of the form receiving beam disposed from the main form to the sub-form. A form supporting structure for a haunch portion of a bridge floor slab, wherein a push bolt is provided from a side end to a back surface of an upper flange of the main girder.