JPH08150611A - Manufacture of precast sole plate - Google Patents

Abstract

PURPOSE: To make a number of days for manufacturing a formwork unnecessary and to resolve economical disadvantage for the cost of the formwork so far manufactured each time. CONSTITUTION: A formwork for the body 1 of a sole plate is enabled to correspond to a precast sole plate having various size by separately forming both the body 1 of the sole plate and a haunch part 2 and thereafter unifying them. Further, a number of days is unnecessary for forming the formwork of the haunch part 2 made of concrete and a cost is low reduced. The formwork is unnecessary in the case of the haunch part 2 made of steel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a precast slab of a bridge structure.

[0002]

2. Description of the Related Art For a bridge floor slab, a formwork is manufactured on site, a reinforcing bar is arranged on the formwork, and a formwork slab for casting concrete is prepared in advance at a factory. There is a precast floor slab in which rebar is placed on the frame, concrete is cast and manufactured, and brought to the site. Precast floor slabs have the advantage of being able to significantly reduce traffic restrictions when replacing and repairing existing floor slabs, because there is no work such as formwork, rebar placement, or concrete placement on site.

[0003] A haunch B for transmitting stress to a supporting girder C smoothly on both the cast-in-place slab and the precast slab, as shown in FIG.
A cross-section changing portion 1 is formed as a haunch portion B between the support beam C and the floor slab together with the support portion B2.

[0004] Generally, the length and the number of girder of the bridge floor slab are different for each bridge, and a drainage gradient is provided in the width direction of the bridge surface. The spacing between the lower surface of A and the supporting spar C of the floor slab is different as H1, H2 in FIG. 13 and H1, H2, H3 in FIG. 14, and the size and shape of the haunch portion B are different. Not constant. Therefore, it is impossible to standardize the size and shape of the haunch.

[0005] This poses a major disadvantage for precast slabs made in the factory. In the precast slab, as shown in FIG. 15, the slab main body A and the haunch portion B are integrally formed, so that each time, a steel mold for the precast slab corresponding to the situation at the site must be manufactured. It takes many days for forming the formwork, and the produced steel formwork is amortized only with individual precast slabs, so the formwork cost is very high and there is an economic disadvantage. Although the floor slab main body A is divided into two parts from the center in FIG. 15, the bridge structure is different as shown in FIGS. 13 and 14, and the on-site working conditions are different. It is divided into appropriate sizes in the axial direction and the width direction depending on the working conditions.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems of the number of days required for manufacturing a formwork in a precast slab and the economic disadvantage of formwork cost by means described below. is there.

[0007]

According to the present invention, in order to solve the above-mentioned problems, a slab main body and a haunch portion are separately formed, and thereafter, a haunch portion is integrated with the back surface of the slab main body to form a precast slab. Provides a means of fabrication.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a precast floor slab 1
It is a perspective view which shows the Example which produced the haunch part 2 and 2, respectively. Although not shown, the floor slab main body 1 and the haunch portion 2 are formed by casting concrete into steel molds that have been manufactured in advance.

Here, since the bottom plate of the formwork for forming the floor slab main body is formed flat along the bottom surface of the floor slab main body 1, various forms can be obtained simply by changing the position of the side plate. It can also handle the production of precast floor slabs of large size. Further, the mold for forming the haunch portion is manufactured in a size and a shape suitable for the situation at the site, but since the size is small, the manufacturing period and cost can be reduced.

The floor slab main body 1 and the haunch portion 2 formed as described above are integrated as shown in FIG.

A specific example of the integration of the floor slab body 1 and the haunch portion 2 will be described below. In FIG. 3, the floor slab body 1 and the haunch 2
And are integrated by adhering the concrete surface joints with an adhesive.

In FIG. 4, the floor slab main body 1 and the haunch section 2 are arranged such that the anchor 3 previously embedded in the haunch section 2 is positioned in the notch 4 of the floor slab main body 1. The filling material 6 is injected from the injection hole 5 pierced into the holes to be integrated. In addition, the concrete surface joint between the floor slab body 1 and the haunch 2 may be integrated using an adhesive or a filler.

In FIG. 5, the floor slab body 1 and the haunch portion 2 are formed by inserting an anchor 7 previously embedded in the floor slab body 1 into an insertion hole 8 formed in the haunch portion 2. And the haunch part 2 are joined, and the notch 9 of the haunch part 2 is filled with the filler 6 to be integrated. In addition, the concrete surface joint between the floor slab body 1 and the haunch 2 may be integrated using an adhesive or a filler.

In FIG. 6, the floor slab main body 1 and the haunch portion 2 are formed by an insert anchor 1 embedded in the haunch portion 2 in advance.
An anchor bolt 13 is inserted through the notch 11 of the floor slab main body 1 through the insertion hole 12, fastened and integrated, and the notch 11 is filled with the filler 6. In addition, the concrete surface joint between the floor slab body 1 and the haunch 2 may be integrated using an adhesive or a filler.

In FIG. 7, the floor slab main body 1 and the haunch portion 2 are formed by an insert anchor 1 previously embedded in the floor slab main body 1.
An anchor bolt 17 is inserted through the notch 15 of the haunch part 2 through the insertion hole 16 into the hammer 4, fastened and integrated, and the notch 15 is filled with the filler 6. In addition, the concrete surface joint between the floor slab body 1 and the haunch 2 may be integrated using an adhesive or a filler.

In the precast floor slab integrally manufactured with the floor slab body thus formed and the haunch portion, the haunch portion may be made of steel instead of concrete. Hereinafter, an example in which the haunch portion is made of steel will be described.

In FIG. 8 and FIG. 9, the haunch 2 has a longitudinal rib 23 in the bridge axis direction and a lateral rib 24 in the width direction between the upper plate 21 and the lower plate 22 having the bolt insertion holes 26 formed therein. It is manufactured in a haunch shape as a whole. The floor slab main body 1 and the haunch portion 2 are in close contact with the lower surface of the floor slab main body 1 and the upper surface of the haunch portion 2, and anchor bolts 25 previously embedded in the floor slab main body 1 are inserted into bolt insertion holes 26 of the haunch portion 2. The protruding tip is inserted into the bottom surface of the floor slab main body 1 and tightened with a nut 27 to be integrated. Here, the upper plate 21 and the lower plate 2
2. The vertical ribs 23 and the horizontal ribs 24 are all formed of a steel plate.

In FIGS. 10 and 11, the haunch portion 2
The vertical ribs 23 in the bridge axis direction and the horizontal ribs 24 in the width direction are located between the upper plate and the lower plate having the anchors 28 protruding from the upper surface, and are formed in a haunch shape as a whole. The floor slab body 1 and the haunch portion 2 are arranged by positioning an anchor 28 projecting from the lower surface of the floor slab body 1 in a notch 29 previously cut in the floor slab body 1 on the upper plate 21 of the haunch portion 2. The filling material 30 is filled into the floor slab body 1 through the opening 29a above the floor slab body 1 to be integrated. Here, the upper plate 21, the lower plate 22, the vertical ribs 2
3. Each of the horizontal ribs 24 is formed of a steel plate.

In this way, the precast floor slab is formed as a whole.

[0020]

According to the present invention, since the floor slab main body and the haunch portion are separately formed, the floor slab main body form can be adapted to precast floor slabs of various sizes simply by changing the position of the side plate. When the haunch is made of concrete, the haunch part formwork is small, so the production period is short, and the cost can be kept low.When the haunch part is made of steel, a formwork is required. It has a great effect of not doing so.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a precast slab in which a slab main body and a haunch portion are separately formed.

FIG. 2 is a perspective view showing an embodiment in which a floor slab body and a haunch portion which are separately formed are integrated.

FIG. 3 is an explanatory view showing an embodiment in which the floor slab body and the haunch portion are integrated.

FIG. 4 is an explanatory view showing another embodiment of the integration of the floor slab body and the haunch portion.

FIG. 5 is an explanatory view showing another embodiment of the integration of the floor slab main body and the haunch portion.

FIG. 6 is an explanatory view showing another embodiment of integration of the floor slab body and the haunch portion.

FIG. 7 is an explanatory view showing another embodiment of the integration of the floor slab body and the haunch portion.

FIG. 8 is an explanatory view showing an embodiment in which a steel haunch portion is integrated with a floor slab main body.

FIG. 9 is a plan view showing an embodiment of a haunch portion made of steel.

FIG. 10 is an explanatory view showing another embodiment in which a steel haunch portion is integrated with a floor slab main body.

FIG. 11 is a plan view showing an embodiment of a steel haunch portion.

FIG. 12 is an explanatory view of a haunch portion in a bridge floor slab according to a conventional example.

FIG. 13 is an explanatory view showing a relation between a drainage gradient of a floor slab and a haunch portion in a bridge slab according to a conventional example.

14 is an explanatory diagram according to a conventional example showing a relationship between a drainage gradient of a floor slab and a haunch portion in the bridge slab having a different number of digits from the bridge slab shown in FIG. 9.

FIG. 15 is an explanatory view showing a conventional example of a precast floor slab.

[Explanation of symbols]

 1 ... Floor slab body 2 ... Haunch part

Claims (3)

[Claims] 1. A method for manufacturing a precast slab, comprising forming a slab body and a haunch portion separately, and then integrating the haunch portion on the back surface of the slab body. 2. The method according to claim 1, wherein the haunch portion is made of concrete. 3. The method according to claim 1, wherein the haunch portion is made of steel.