JPS60138106A - Casting replacement construction method of synthetic beam floor panel in road bridge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for replacing a composite girder deck for forming a road surface such as a passageway made of cypress wood.

Concrete wood slabs that form road surfaces such as passageways include synthetic girder slabs and non-synthetic girder slabs. Is the former composite girder floor slab a floor slab or this wood slab? It is common to have a structure in which the supporting main girder made of steel is integrated and resists the loading of moving vehicles, etc. The latter non-synthetic girder deck does not exceed the above-mentioned effectiveness even just by the strength of the main girder. It has a structure that can withstand loads.

By the way, in recent years, as concrete slabs have become obsolete, more and more work is being done to replace wooden slabs, or to replace wooden slabs.

When performing this replacement work 4, if the woodblock is the non-synthetic girder slab mentioned above, the main girder is made of a strong acid such as light, so it is replaced one by one while managing traffic by one-way traffic. However, in the case of a composite girder deck in which the deck slab and the main girder supporting it are integrated to resist the load, the structure of the composite girder deck %[ Naturally, it is expected that the problem of insufficient strength of the main girder will occur when the slab is replaced, and this provision also makes it extremely difficult to carry out floor slab replacement work without customs clearance. Therefore, in the past, except for sites where the width was wide enough for one repetition of construction, it was necessary to construct so-called emergency constructions that straddle the honor construction area, or to secure a detour and create a branch road accordingly. Work was being carried out to replace the floor slabs to accommodate traffic using temporary construction and other means.

However, with such conventional methods, even if the emergency construction is to be carried out, it is a fairly large-scale construction work that straddles the replacement work section, which requires a great deal of effort and cost.
! In addition, there are problems such as it is often difficult to secure a detour depending on the section of the replacement work, and in any case, measures that can solve these problems are strongly desired.

The present invention has been made in consideration of one or more of the following points:
Fundamentally, large-scale traffic management methods such as securing detours and constructing emergency roads, which require a large amount of earthen floor space and expense, should be fundamentally eliminated.
Is there a method for replacing composite girder slabs that allows x<1? This is what we are trying to provide.

Hereinafter, an embodiment of the invention will be described in detail based on the drawings.

First, the basic idea when implementing the construction method according to the present invention will be explained with reference to FIGS. 1 and 42. When replacing composite girder slabs, the problem is ensuring the strength of the steel girders. In other words, the steel girder after removing the old deck slab will not be strong enough to handle live loads such as vehicle traffic. Therefore, in the present invention, we adopted a construction method in which half of each side is replaced, and in this case, as shown in the gI diagram, the middle girder 3 between the two outer girders 1 and 2 extending in the horizontal axis direction is connected to the floor slab 4 and the edge Therefore, this middle girder 3 is considered to be a non-synthetic sheath, and reinforcing steel wire 5 such as wire is stretched in order to compensate for the lack of strength. 3℃, load IL in the opposite direction to the middle girder 3? It is unique in that it is reinforced to the same 4 degree 'jm extension as the outer girder l, which is a composite girder.

We briefly describe the specific examples shown in FIGS. 3 to 6.

Figure 3 1al to tg+ are process diagrams showing the steps for replacing the floor slab. First, as shown in the same figure (at), each steel # girder (external digit 1.2, middle digit 3)
After assembling the scaffolding 7 on the lower m11j and the measurement method, support the connecting girder 8a that connects the two girders 2 and 3 between the outer girder 2 and the middle girder 3, and the floor slab above the connecting girder 8a. Attach an additional girder such as the distal girder 8b.

These additional girders will also be stored so that they can be used as permanent girders like the other girders.

Next, in the vicinity of the girder end of the middle girder 3, a
As shown in b), a hole 10 for bolt insertion is made near the cape 9 of the middle girder 3, and this hole 10Y is used to install an anchor for fixing the end of the reinforcing steel wire 5 of the middle girder, which will be described later. Metal fittings 11
& Bolt. This anchor fitting 11 is also bolted to the vicinity of the other end of the middle girder 3 in the same manner.In this case, both anchor fittings 11 are attached in the same manner as each other. An example of this anchor 11 using the Sakaki of Guminato is as shown in Fig. 5, ta+ and tbl, where the main body part 38 is attached to the main body part 3a of the middle girder 3 and the lower flange 3b perpendicular to the main body part 3a. A fixed pair of L-shaped plates 11atlla are formed so as to be sandwiched from both sides, a backing plate 11b is placed on the lower surface of the F section flange 3b, and a steel wire through-hole 11CY is melted and sealed on this backing plate Ilb. Extending bearing plate lid
and a reinforcing lip that integrates and reinforces the support plate lid and the contact plate 11b, and is integrally fixed to the middle girder 3 with bolts 12 as shown.

After attaching the anchor fixture 11 as described above, the support device 6 is attached to the middle girder 3. The mounting position and number of the support devices 6 depends on the length of the medium @3, but preferably 4! As shown in FIG. 2, it is best to attach a total of 3 pieces, each 1 inch long, at 104 equal positions along the length of the middle girder 3. 6tal and tbl show a specific example of the structure of this support device 6, which includes a horizontal plate 6a that abuts the lower surface of the lower flange 3b of the middle girder 3 and extends in the longitudinal direction of the lower flange 3b.

A horizontal member 6b made of a channel material which is arranged in the horizontal direction orthogonal to the horizontal plate 6a and is sufficiently longer than the width of the lower flange 3b, and one end of the horizontal member 6b is 7 at each end. The other end is F of the upper flange 3C.
A pair of upper slanted frame rods are arranged with cedar walls that are in contact with the surrounding plate acl and clamp the main body part 3a.
, 6c, and a pair of lower inclined frames, one end of which is attached to the top and bottom of both ends of the horizontal member 6b, the other end of which resides in the cross section of the main body portion 3a0), and which are converged into one so as to intersect on a vertical line segment. 6d, 6d and this inclined frame 6d
A pair of reinforcing inclined frames 6e + 6e are attached, one end of which is attached to the bottom surface of both ends of the horizontal plate 6a at positions 90 degrees different from the horizontal plate 6a, and the other end is fixed to the convergence position of the HTJ ge inclined frame 6d. Reinforcement slope 7V
- Muro e, 5e and fdJR tilt frame 6d, 6
An engagement groove 6. is provided in the 8-cuboid gyrus, which is in the direction of the central axis of the inverted pyramid formed in d, so as to have a sliding angle of 0J, and that engages with the steel wire 5 at the tip. 6g of movable pillars with f & and 6g of this town moving fork pillar
Hydraulic jack 6h arranged between the base end of the horizontal plate 6a and the horizontal plate 6a
and *6t, 6j for positioning the lower flange 6bKR of the support device 6 provided on the lower flange 6b. In addition, B] IJil pillar 6gKi
z adjustment nut) 6k is screwed together, and the upper sloped frame A
One of the inclined frames 6c and 6c and the support device t6 are attached to the middle girder 3 by bolts and nuts 6n in order to facilitate their removal.

To attach the support device 16 with such a stiff configuration to the Br fixed location of the middle girder 3, one end of the steel wire is fixed to the anchor fitting 11 at one end of the girder, and the other end of the steel wire is fixed to the other end of the m#5. While pulling the d lever into the s-line hole 11c of the anchor fitting 11 at the end of the girder, insert the shank 5 into the engagement groove 6 at the tip of the movable strut 6g.
The steel wire 5 is engaged with the wire 5, and the other end is fixed to the anchor fitting 11 (t''C).

After completing the tensioning work of the steel wire 5 in this way,
Set the hydraulic jack 6tl in the dark, extend it slowly and push down the town moving fork pillar 6g to tension the steel wire 5, and in this state, rotate the nut 6k to fix the town moving fork pillar 6g, and then By asking the middle girder 3 to carry the load M in the opposite direction in advance,
The middle girder 3 will be reinforced in a practical manner, and the tension of the mis will be managed by hydraulic pressure. For example, hydraulic jack 6
A load cell or the like may be provided between h and the sounding support 6g.

After completing the reinforcing work for the middle girder 3, as shown in Figure 3 (bl), set the barrier ##I fence 13 as shown in Fig. Fold out the one-side width floor slab as shown by the medium chain line, and then modify or strengthen the dowels as necessary (and also remove the middle girder 3 and outer girder 2).
After reinforcing the upper flanges by providing reinforcement materials 14 on the upper flanges of each, as shown in FIG. Erection 15 yen, set on-site reinforcing bars 16, and use early-strengthening concrete to construct C joint concrete 1.
7 is poured, and the precast floor slab 15 and the outer girder 2 are integrated. 7. Furthermore, after pouring concrete for the ground cover as shown in the figure tdl, the asphalt line equipment 8 was installed.

In this way, the old floor slab 40 one side width wood block was replaced by the predetermined length.Here, the remaining arrow pieces are 111111! i1
Replace the board version with the same suggestion as above. r, as shown in the same figure tdl, the new floor plate survey was made in a panic #till
3'? Traffic switching regulations were carried out on the set soil, and after sanding the remaining one-side width floor slab as shown by the chain line in Figure 2(e), as needed, the +
Reinforcement 5 Furthermore, reinforcing members 14' are provided on the upper flanges of the inner girder 3 and the outer girder l, respectively, to reinforce the upper flanges.

Next, as shown in Figure 1), the precast floor slab 15' is erected, and the on-site reinforcing bars 16' are set, and the joint concrete 17' is cast to integrate the precast floor slab 15' and the outside @l. . Furthermore, as shown in tgl in the same figure, the joint concrete 19 on the middle girder 3 is formed by pouring ultra-fast hardening concrete, and both gray cast slabs 15 are formed.
, 15' and the middle girder 3 are integrated into the pressure, then the middle girder 3
The reinforcing materials, such as the steel wires 5 and the support devices 6, are removed, and then, after pouring concrete at the ground level, asphalt paving 8' is applied to complete the process of replacing the girder gap. Then, by repeating the above-mentioned work steps one after another, the machine 7111
! By doing this, the entire area scheduled for replacement is replaced.

In addition, in the actual example, the steel wire 50 supporting device 6 for reinforcing the middle girder 3 is shown as a ringing strut driven by a hydraulic jack. A configuration with +tA ability that can make it tense is fine, but it is limited to the example and requires more than one effort! i? As mentioned above, in the uninvented method of replacing composite girder slabs, after removing the old slab, the middle girder, which will be the edge cut, is reinforced in advance by means of pilings, supporting devices, etc., and then replaced one side at a time. Because of the 5 conventional method, it is possible to avoid quite large-scale traffic management methods such as securing detours and temporary construction work that requires a lot of intermediate work and expense, and it is also possible to eliminate the actual construction of the middle girder. :j[ll''l 1. The reinforcing means are relatively simple and can be used repeatedly, such as support devices and steel wires.

It is said to be effective in improving work efficiency and reducing construction costs.

[Brief explanation of the drawing]

Figures 1 to 5g and 6(g) show one embodiment of the present invention. Figures 1 and 2 are model diagrams showing the basic concept of the construction method based on the invention. Figure 4 is a process diagram showing the procedure for changing the plate (al and (bl are the approximate positions of the anchors and tools, respectively).
Figure 1, Figure 5 (al and (b) & m of air anchor equipment
A front view and a 1111 side view showing the configuration, and a schematic diagram (al and lbl are the front view and side view of the support device. 1.2... External volume, 3... Middle girder, 4... Old floor Edition, 5
...Reinforcement steel wire, 6. Support device, 11. Anchor equipment,] 5, 15'°... Brekkiist floor slab,
17.17'...Joint concrete, 18, 18'
...asphalt pavement, 19...joint concrete. Figure 3 (Q)

Claims (1)

[Claims] The outer girders extending in the axial direction have an intermediate fI that also extends in the transverse direction, and each of these girders and the concrete deck slab thereon are integrally under a live load. This is a replacement construction method for composite girder slabs, which have a structure that resists corrosion. A process of fixing both ends of the steel wire near the girder end of the middle girder, a step of attaching a support device having a movable column of the support device, and pushing the movable column so that it engages the OJ # column of the support device at least at one place between both fixing points of the steel wire; and (2) after replacing the one side width slab with 8 between the girder ends of each girder, the process of replacing the remaining one side width deck. Replacement method for composite girder slabs.