JPH04237705A - Pc slab of bridge pedestrian lane and center removing method for it - Google Patents

Abstract

PURPOSE:To facilitate execution of works and increase the strength by installing PC slabs with a horizontal slab body in conjugation on one side over a curbstone part, and arranging them and sucuring at/to the desired part on a bridge with the aid of props. CONSTITUTION:PC slabs 1 for a pedestrian path on a bridge are formed in prestressed concrete structure, wherein a slab body 3 is provided conjugately on one side over the curbstone part 2 horizontally. A metal fixture 6 is furnished at a left and a right edge of this body 3, and an assistant prop 9 with elevation/sinking adjustability is installed on the undersurface of the body 3. Rubber sheets 10 are placed in line on a ground covering side receptacle table of the bridge, and thereover those slabs 1 are laid in the condition that the end of the body 3 is placed and secured. The height of the prop 9 is adjusted, and its bottom is put in tight contact with the bridge surface, and the slabs 1 are joined together by the abovementioned metal fixtures 6. The gaps between the slabs 1 are stopped up by pressure with a backup material and filled with mortar, and asphalt 11 paving is applied over the slabs 1. This arrangement enables increasing the strength, reducing the weight, facilitating execution of works, shortening the construction term, and performing easy repair partially and burying of additional cable, etc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC deck slab for a bridge walkway and a method for hollowing out a bridge walkway using the PC deck slab for a bridge walkway.

0002

[Prior art] Conventional on-site hollow concrete construction methods include burying foamed resin boards and hollowing them out, burying plywood formwork and hollowing them out, burying lightweight blocks, and burying widening pipes. There are various methods such as hollowing out the material using a foam board, but the most common method is to bury it in a foamed resin board. In this case, the foamed resin board conforms to "JIS A
9511 Foam Polystyrene Heat Insulating Board No. 1" is used.

0003

[Problems to be Solved by the Invention] The prior art described above has the following problems. 1. Because it is cast-in-place concrete, the construction period is long and quality control is difficult. 2. Because the filling material is lightweight, it is difficult to position it in concrete that has not yet hardened. 3. It is not possible to meet the request to further reduce the weight of the bridge walkway. The present application has been made in view of the above-mentioned problems of the conventional technology, and its purpose is to provide a device that can do the following. The rank of the bridge (main girder) may be reduced by shortening the construction period and hollowing out, which is economical and allows for repairs and maintenance even after construction.
It is easy to maintain, perform additional work, and bury cables, etc. in hollow holes, so it will produce overall economic effects.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention is as follows. That is, the first invention includes the curb portion 2 and the back surface portion 2 of the curb portion 2.
The slab main body 3 is connected horizontally at a slightly upper position in A and in a direction perpendicular to the longitudinal direction of the curb section.
The curb portion 2 and the deck slab body 3 are integrally constructed of a prestressed concrete structure, and is a bridge sidewalk PC deck slab.

[0005] The second invention is a method for hollowing out bridge walkways, which is characterized by comprising the following steps. First step: When widening or newly constructing a sidewalk on a bridge, install a pedestal on the ground side at the location where it is desired to install a bridge sidewalk PC deck slab, and lay out rubber plates. Second step Fine adjustment of the height of the installation location of the curbstone section 2 is performed by dry mixing mortar at the installation location of the curbstone section 2. Third step: Attach the floor slab body by aligning the anchor bolts on the ground side with the holes in the slab body. Step 4: Extend the auxiliary support column to the required length. Step 5: Stretch the rubber plate pasted under the auxiliary support column until it comes into close contact with the bridge body. Step 6: Push back-up material (sponge, Styrofoam, etc.) between the floor slabs and pour mortar. Step 7: Paving the deck slab with asphalt.

[0006]

[Action] Explain along with the effects.

[0007]

[Example] An example will be described with reference to the drawings. 1
is the PC floor slab for the bridge sidewalk section of the present application. This floor slab is composed of a curb section 2 and a floor slab main body 3 that is connected horizontally at a slightly upper position on the back surface 2A of the curb section 2 in a direction orthogonal to the longitudinal direction of the curb section. ing. In the figure, 2A1 is the upper back part located above the floor slab main body 3 in the back part 2A of the curb part 2, and 2A2
is a lower back part located below the floor slab main body 3 in the back part 2A of the curb part 2. In addition, the curb stone part 2 has the same structure as a known curb stone in a cross-sectional structure cut in a direction perpendicular to the longitudinal direction of the curb stone part.

Reference numeral 4 denotes an upper surface stepped portion composed of the upper back surface 2A1 of the curb section 2 and the upper surface of the floor slab body 3, and 5 indicates the upper surface step section composed of the lower rear surface 2A2 of the curb section 2 and the lower surface of the floor slab body 3. This lower surface stepped portion constitutes a so-called hollow structure. The curb portion 2 and the slab body 3 are integrally constructed of a prestressed concrete structure. 1A and 1B are reinforcing bars, and 1C is a PC steel wire. Although it varies depending on the conditions of the installation location, the dimensions of this application are for reference: front and rear length ~2490mm, width ~994mm
It is about mm.

Furthermore, reference numeral 6 denotes a joining fitting provided at the center of the left and right sides of the floor slab body 3, 7 an anchor bolt hole opened at the center near the rear side of the floor slab body 3, and 8 a predetermined hole in the floor slab body 3. It is an auxiliary fulcrum part provided at a location, and is composed of a central auxiliary fulcrum hole 8A and an insert nut 8B provided around this auxiliary fulcrum hole. Therefore,
When the floor slab main bodies 3 are arranged side by side, the joining fittings are attached so that the joining fittings 6 of the floor slab main body located on the left side and the joining fittings 6 of the floor slab main body located on the right side face each other. The structure of the joining fitting 6 is an outer side wall 6A of a box-like body 6A having a rectangular plane.
A long connecting hole 6A2 is opened in the outer side wall 1, and the connecting long hole 6A2 in the outer side wall is opened at the left and right side wall surfaces of the floor slab main body, and is embedded with the top surface open. 6
B is an anchor reinforcing bar that connects and fixes the box-like body and the floor slab.

Reference numeral 9 denotes an auxiliary support column, which includes a round steel 9B of a predetermined height planted in the center of the upper surface of a planar circular base plate 9A, a lower pipe 9C planted on the outer periphery of this round steel, and a lower pipe 9C planted on the outer periphery of this round steel. An upper pipe 9D is screwed to the lower pipe so that it can be raised and lowered, and a round steel 9B is horizontally attached to the upper surface of the upper pipe.
It is composed of an upper fixing plate 9E which is stretched in a state where it is penetrated, and a bolt hole 9E1 opened in this upper fixing plate 9E.

[0011] Next, the process of laying the bridge sidewalk PC deck slab 1 of the present invention will be explained in order. First step: When widening or newly constructing a sidewalk on a bridge, a pedestal is provided on the ground side at a location where it is desired to install the bridge sidewalk PC floor slab 1, and rubber plates 10 are laid out. Second step The height of the curb stone section 2 is finely adjusted using dry mortar (cement and sand that does not contain water) at the location where the curb stone section 2 is installed. Third step: Align the anchor bolts on the ground side with the holes in the slab body and attach the slab body. Fourth step: Extend the auxiliary support column to the required length. Adjust the round steel at the top of the auxiliary support by rotating it with a pipe wrench. Step 5: Stretch the rubber plate 10 pasted under the auxiliary support column until it comes into close contact with the bridge body. 6th Step A backup material (sponge, styrofoam, etc.) is pushed between the floor slabs and mortar is injected. This is for waterproofing. Seventh step: Pave the deck slab with asphalt 11.

0012

[Action] Explain along with the effects.

[0013]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects. 1. Since the construction period can be shortened, costs can be reduced. In other words, by prefabricating it in a factory, the sidewalk portion does not need to be made of cast-in-place concrete. In this point,
If the sidewalk is made of cast-in-place concrete, it will take several weeks to cure. 2. Bridges can be made smaller. In other words, by using prestressed concrete, the strength of the members is high and the walkway portion can be made thinner. Moreover, since it is light, the bridge can be made smaller. 3. Easy to repair. That is, since it is formed by combining small parts, it is easy to handle and only the damaged part can be replaced. 4. Maintenance is easy. That is, it is durable because it uses high-strength materials. The aforementioned repairs are easy. 5. Additional construction is easy. In other words, when you want to add a sidewalk on the other side of a bridge, it is easy to install the floor slab, so it is a small-scale construction project. 6. It can be buried underground and can be easily added. That is, since the pavement (slab) itself can be easily removed and installed, it is easy to add cables and the like buried under the pavement (hollowed portion). Items to be buried under sidewalks include communication cables, power transmission lines, and water pipes. 7. Safety is improved through optimal design. In other words, with current construction methods, when a truck lands on the sidewalk, the pavement may cave in.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view after construction.

FIG. 2 is a side view of a bridge sidewalk PC deck slab.

FIG. 3 is a plan view of the reinforcement arrangement state.

FIG. 4 is a cross-sectional view showing the installation state of the bridge sidewalk PC deck slab.

FIG. 5 is a front view of the same as above.

FIG. 6 is an enlarged view of the same as above.

FIG. 7 is a plan view of the joint fitting.

FIG. 8 is a side view of the same as above.

FIG. 9 is a front view of the same as above.

FIG. 10 is a plan view of the auxiliary support column.

FIG. 11 is a front view of the same as above.

[Explanation of symbols]

1 PC floor slab for bridge walkway 2 Curb section 3　Floor slab body 4 Top stepped section 5 Lower step part 6 Joining metal fittings 7 Anchor bolt hole 8 Auxiliary fulcrum part 9 Auxiliary support section

Claims (2)

[Claims] [Claim 1] Curbstone portion 2 and back surface portion 2A of this curbstone portion 2
It is composed of a floor slab main body 3 which is horizontally connected in a direction slightly above the longitudinal direction of the curb section, and the curb section 2 and the floor slab main body 3 are integrally constructed of a prestressed concrete structure. PC deck slabs for bridge walkways are characterized by: [Claim 2] A method for hollowing out bridge walkways, characterized by comprising the following steps: First step: Install a pedestal on the ground side at the desired location and lay out rubber plates. Second step Fine adjustment of the height of the installation location of the curbstone section 2 is performed by dry mixing mortar at the installation location of the curbstone section 2. Third step: Attach the floor slab body by aligning the anchor bolts on the ground side with the holes in the slab body. Step 4: Extend the auxiliary support column to the required length. Step 5: Stretch the rubber plate pasted under the auxiliary support column until it comes into close contact with the bridge body. Step 6: Push back-up material between the floor slabs and inject mortar. Step 7: Paving the deck slab with asphalt.