Deck slab lifting device and deck slab lifting method using same

Abstract

To provide a floor slab hanging device and a floor slab hanging method using the same capable of easily performing work in a short time by a small number of workers, and preventing unnecessary stress from acting on a floor slab.SOLUTION: A floor slab hanging device 1 for lifting a floor slab P1 comprises: a hanging balance frame body 2 combined with a steel material; a plurality of fixed pulleys 3 attached to the hanging balance frame body 2; and a plurality of hanging members 4 for hanging up the floor slab P1 inserted through the two adjacent fixed pulleys 3. Both ends of each hanging member 4 of the plurality of hanging members 4 are connected to different hanging metal fittings Hb of a plurality of hanging metal fittings Hb attached to the floor slab P1.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a deck slab lifting device used during deck erection work and a deck slab lifting method using the same. [Background technology]

[0002] In bridge deck erection work, in which the deck is lifted and installed on the bridge girders, in order to ensure the flatness of the deck after it is erected on the bridge girders, it is necessary to suppress deformation of the deck when it is lifted and lowered during erection so as to avoid unnecessary stress.

[0003] Traditionally, a number of hanging fittings have been embedded in a precast concrete deck (hereafter referred to as PCa deck) to provide multi-point suspension, and a lifting scale made of steel members assembled in a ladder shape to minimize bending stress has been used to lift the PCa deck by hanging wires vertically from the lifting scale.

[0004] Specifically, in the case of a pretensioned prestressed concrete deck P1 (hereafter referred to as a PC deck), it is common to lift it at eight points using a lifting balance, as shown in Figure 2. However, even in this case, it was necessary to check whether the load was being evenly applied to each of the lifting materials (each wire) at the lifting point by adjusting the length of the lifting materials such as the lifting wires with a chain block 5 and measuring the tension applied to each of the lifting materials with a load meter.

[0005] This required checking the load at eight locations and coordination between each location, which not only increased the difficulty of the work but also required the deployment of eight workers, which led to increased costs.Therefore, there was a demand for a deck slab suspension device that could reduce the number of workers required and enable easy installation in a short time.

[0006] For example, Patent Document 1 discloses a suspended balance device 1 comprising a balance body 2, a counterweight 3 provided at the rear end of the balance body 2, a bracket holding portion 4 provided at the front end of the balance body 2, and a hanging material such as a wire 61 for hanging the balance body 2, the length of which can be adjusted by a chain block 7 (see paragraphs

[0017] to

[0047] of the specification of Patent Document 1 and Figures 1, 5, 6, etc. of the drawings).

[0007] However, the hoisting balance device 1 described in Patent Document 1 is a hoisting balance device used when attaching a bracket to a bridge pier to prevent the bridge from falling over, and was not applicable to the erection work of a deck. Furthermore, the invention described in Patent Document 1 did not recognize at all the above-mentioned problem of lifting the deck so as not to apply bending stress to the deck. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2020-84634 A Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, the present invention has been devised in consideration of the above-mentioned problems, and its object is to provide a deck slab lifting device and a deck slab lifting method using the same that can be used easily and in a short time by a small number of people and that does not apply unnecessary stress to the deck. [Means for solving the problem]

[0010] The deck slab hoisting device according to claim 1 is a deck slab hoisting device for hoisting a deck, and is provided with a suspension balance frame body formed by combining steel materials, a plurality of fixed pulleys attached to the suspension balance frame body, and a plurality of suspension members for hoisting the deck slab that are inserted through the fixed pulleys, is, one The end is attached to the deck The above Multiple hanging fixtures The other end of the first hoisting tool is connected to one of the first hoisting tools, and is inserted through two adjacent fixed pulleys of the plurality of fixed pulleys.Each of them is connected to a different hanging hardware.

[0011] The deck slab suspension device of claim 2 is characterized in that, in the deck slab suspension device of claim 1, each of the multiple suspension members is length adjustable by a manually operated length adjustment jig.

[0012] The deck slab suspension device of claim 3 is the deck slab suspension device of claim 2, characterized in that each of the multiple suspension members is equipped with a load meter so that tension can be measured.

[0013] The method for lifting a deck slab of claim 4 is a method for lifting a deck slab using a deck slab lifting device described in any one of claims 1 to 3, characterized in that the hanging material is inserted through two adjacent fixed pulleys, and both ends of the hanging material are respectively connected to different hanging fittings of a plurality of hanging fittings attached to the deck slab, and the deck slab is lifted using the deck slab lifting device.

[0014] The method for lifting a deck slab of claim 5 is a method for lifting a deck slab using the deck slab lifting device described in claim 3, characterized in that the hanging material is inserted through two adjacent fixed pulleys, both ends of the hanging material are respectively connected to different hanging fittings of a plurality of hanging fittings attached to the deck slab, and the deck slab is lifted using the deck slab lifting device, and the length of each of the plurality of hanging materials is adjusted using the length adjustment jig so that the measurement values ​​of the load meter are as uniform as possible. Effect of the Invention

[0015] According to the inventions of claims 1 to 5, since both ends of the hanging material inserted into two adjacent fixed pulleys are connected to different hanging fittings, the tensions applied to the hanging material when lifting the different hanging fittings are approximately equal, making it easy to lift without applying unnecessary stress to the deck slab. Also, the number of personnel required for each hanging fitting can be halved, making it possible to easily and quickly install the deck slab with a small number of personnel.

[0016] In particular, according to the invention of claim 5, the length of each of the plurality of hanging members is adjusted using a length adjustment jig so that the measurement values ​​of the load meters are as uniform as possible, so that no unnecessary stress is applied when the deck is lifted, and the flatness of the deck can be ensured after it is erected on the bridge girder. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram showing the state in which a deck slab is being lifted using a deck slab lifting device according to an embodiment of the present invention, where (a) is a front view seen in the bridge axis direction, and (b) is a vertical cross-sectional view seen perpendicular to the bridge axis. [Diagram 2] Figure 2 is a schematic diagram showing the state in which a deck is lifted using a conventional deck lifting device, where (a) is a front view seen in the bridge axis direction, and (b) is a vertical cross-sectional view seen perpendicular to the bridge axis. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a deck slab lifting device and a deck slab lifting method according to the present invention will be described in detail with reference to the drawings.

[0019] [Deck slab suspension device] First, a deck slab hoisting device 1 according to an embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing a state in which a deck P1 is hoisted using the deck slab hoisting device 1 according to an embodiment of the present invention, where (a) is a front view seen in the bridge axis direction, and (b) is a vertical cross-sectional view seen in a direction perpendicular to the bridge axis. Note that the deck P1, which is a pretensioned PC deck, will be described as an example of the deck to be hoisted.

[0020] As shown in Fig. 1, the deck slab hoisting device 1 according to this embodiment is a deck slab hoisting device for hoisting a deck P1. This deck slab hoisting device 1 is composed of a suspension balance frame 2 made of a combination of steel materials, a number of fixed pulleys 3 attached to this suspension balance frame 2, and a number of suspension members 4 for hoisting the deck P1.

[0021] (Hanging balance frame) The hanging balance frame 2 has a frame body as its base, in which upper main steel materials 20, such as H-shaped steel, I-shaped steel, or channel steel, and lower main steel materials 21 are combined in a crisscross pattern, and a number of auxiliary steel materials 23 are attached across the lower end of the lower main steel material 21 to increase rigidity, forming a ladder shape when viewed from above.

[0022] A lifting plate 24 for lifting with a lifting machine such as a crane is provided protruding upward from the upper end of the upper main steel material 20 of the lifting balance frame 2. A lifting hole 24a is formed in this lifting plate 24, and it can be lifted with a sling wire W1 hooked to a lifting machine via a metal fitting such as a shackle S1 or a round ring R1.

[0023] A hanging plate 25 for hanging the fixed pulley 3 is protruded downward from the lower end of the lower main steel member 21 of the hanging balance frame 2. A hanging hole 25a is formed in this hanging plate 25, and the fixed pulley 3 can be hung via a metal fitting such as a shackle S1.

[0024] (fixed pulley) The fixed pulley 3 is a so-called fixed pulley that does not move but only swings when connected to the hanging plate 25, and has the function of changing only the direction of the force acting on the hanging material 4 inserted through the fixed pulley 3 without changing the magnitude of the force. In the illustrated embodiment, four pairs of fixed pulleys 3 are attached in accordance with the number of hanging plates 25 of the hanging balance frame 2, for a total of eight.

[0025] (Hanging material 4) The hoisting member 4 is a wire rope made of a sling wire for hoisting the deck P1, and is passed through two adjacent fixed pulleys 3, 3 attached to the suspension plate 25 of the same lower main steel member 21. Of course, the hoisting member 4 is not limited to a wire rope, and can be any long wire capable of suspending the weight of the deck P1 to be borne. Both ends of this hoisting member 4 are connected to two different hoisting fittings Hb attached to different positions on the deck P1 via chain blocks 5 and load meters 6, which will be described later. These hoisting fittings Hb are attached to the deck P1 with embedded anchors.

[0026] Furthermore, a chain block 5 is attached to one end of this hanging material 4 via a round ring R2, and the length can be adjusted by the chain block 5. This chain block 5 is not limited to a chain block, and may be any manually operated length adjustment tool such as a lever block (registered trademark).

[0027] A load meter 6, such as a load cell, capable of measuring the stress (tension) acting on the hanging member 4 is attached to the other end of the hanging member 4 via a round ring R2. This makes it possible to accurately grasp the stress (tension) acting on the hanging member 4. However, as described below, the number of load meters 6 that were previously required for each hanging fitting Hb of the deck P1 has been halved, which halves the effort and time required to check the load (stress).

[0028] [How to lift the deck] Next, a deck hoisting method according to an embodiment of the present invention, in which the deck P1 is hoisted using the above-mentioned deck hoisting device 1, will be described with reference to Figures 1 and 2. The method will be described in comparison with the case in which the deck P1 is hoisted using a conventional deck hoisting device 10 shown in Figure 2. Figure 2 is a schematic diagram showing the state in which the deck is hoisted using a conventional deck hoisting device, where (a) is a front view seen in the bridge axis direction, and (b) is a vertical cross-sectional view seen at right angles to the bridge axis. Note that the same reference numerals indicate the same configuration as the above-mentioned deck hoisting device 1.

[0029] As shown in Fig. 2, the conventional deck slab suspension device 10 includes a lifting balance frame 2 having the same configuration as the deck slab suspension device 1, and a chain block 5 is attached directly to the suspension plate 25 of the lifting balance frame 2, and its lower end is connected to a lifting fitting Hb via a load meter 6. For this reason, the conventional deck slab suspension device 10 is provided with a chain block 5 as a lifting material for lifting the deck P1 for each lifting fitting Hb corresponding to the lifting point for lifting the deck P1, and each chain block 5 is provided with a load meter 6.

[0030] In the conventional deck hoisting device 10, unnecessary stresses on the deck P1, particularly the stresses acting on the lifting fittings Hb, which are the lifting points, were varied to prevent bending stresses from occurring in the deck P1, and the stresses acting on each lifting point were checked using a load meter 6.

[0031] In other words, with the conventional deck slab suspension device 10, the length of the chain block 5 had to be adjusted for each suspension fitting Hb, which is the lifting point of the deck P1, while checking the measurement value of the load meter 6, and moreover, these adjustments had to be done by workers communicating with each other. For this reason, with the conventional deck slab suspension device 10, a worker was required for each suspension fitting Hb, that is, for four locations along the direction perpendicular to the bridge axis when viewed from the front as shown in Figure 2(a) and two rows along the bridge axis direction as shown in Figure 2(b), for a total of eight suspension fittings Hb.

[0032] Moreover, it was not just a matter of adjusting the length; changing the length of one chain block 5 also changes the measurement value of the load meter 6 at an adjacent location, so length adjustments had to be made in eight locations in coordination, making it a difficult and time-consuming task.

[0033] In contrast, as shown in Fig. 1, in a deck slab suspension device 1 according to an embodiment of the present invention, as described above, one suspension member 4 is connected to two adjacent different suspension fittings Hb via a chain block 5 via two adjacent fixed pulleys 3, 3. Since the fixed pulley 3 only changes the direction of the force without changing the magnitude of the force, the two different suspension fittings Hb connected by the single suspension member 4 are lifted with approximately the same force. This eliminates the need to uniformly adjust the force used to lift these suspension fittings Hb.

[0034] In other words, while the conventional deck slab suspension device 10 requires coordinated length adjustment at eight locations, the deck slab suspension device 1 only requires coordinated length adjustment at four locations. This significantly reduces the difficulty of the work, and not only does it cut the work time in half, it can be completed in a much shorter time.

[0035] In addition, the deck slab lifting device 1 reduces the difficulty of the work, thereby reducing the risk of unnecessary stress acting on the deck, making it easier to lift the deck P1 without applying unnecessary stress to it.

[0036] Furthermore, with the deck slab lifting device 1, the number of locations where length adjustments are made with the chain block 5 while checking the measurements from the load meter 6 has been halved from eight to four, so the number of personnel required for each lifting fixture Hb can be reduced by at least half. Furthermore, as the skill level of workers increases, the difficulty of the work decreases, so it becomes possible for them to adjust the length by working at two adjacent locations at the same time, and the number of workers required to lift the deck slab P1, from eight, can be reduced to two, making it possible to perform the work safely.

[0037] In short, according to the above-described deck slab hoisting device 1 according to the present embodiment and the deck slab hoisting method according to the present embodiment using the deck slab hoisting device 1, the deck slab erection work can be easily performed by a small number of personnel in a short time. Also, according to the deck slab hoisting device 1 according to the present embodiment and the deck slab hoisting method according to the present embodiment using the deck slab hoisting device 1, the difficulty of the work is reduced, so that the risk of unnecessary stress acting on the deck can be reduced, and it becomes easy to hoist the deck P1 without unnecessary stress acting on it.

[0038] Although the deck hoisting device 1 according to the embodiment of the present invention and the deck hoisting method according to the embodiment of the present invention using the same have been described in detail above, the above-mentioned and illustrated embodiments are merely examples of specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted in a restrictive manner based on these. [Explanation of symbols]

[0039] 1: Deck slab suspension device 10: Conventional deck suspension device 2: Hanging balance frame 20: Upper main steel material 21: Lower main steel material 23: Auxiliary steel material 24: Lifting plate 24a: Lifting hole 25: Hanging plate 25a: Hanging hole 3: Fixed pulley 4: Hanging material 5: Chain block (manually operated length adjustment jig) 6:Load cell P1: PC floor slab (floor slab) G1: Ground Hb: Hanging hardware R1,R2:Round ring S1: Shackle W1: Sling wire

Claims

1. A deck slab lifting device for lifting a deck, The suspension balance frame is made of a combination of steel materials, and a plurality of fixed pulleys are attached to the suspension balance frame. A plurality of suspension members are inserted through the fixed pulleys to hoist the deck. One end of each of the plurality of hanging members is connected to one of the plurality of hanging hardware attached to the deck, and the other end is inserted through two adjacent fixed pulleys of the plurality of fixed pulleys and connected to a different one of the plurality of hanging hardware. A deck slab suspension device characterized by the above.

2. The length of each of the plurality of hanging members is adjustable by a manually operated length adjustment jig.

2. The deck slab suspension device according to claim 1 .

3. Each of the plurality of hanging members is equipped with a load meter so that tension can be measured.

3. The deck slab suspension device according to claim 2 .

4. A method for lifting a deck using the deck lifting device according to any one of claims 1 to 3, comprising: The suspending member is inserted through two adjacent fixed pulleys, and both ends of the suspending member are respectively connected to different suspending fittings of a plurality of suspending fittings attached to the deck, and the deck is hoisted using the deck suspending device. A method for lifting a deck, comprising:

5. A method for lifting a deck using the deck lifting device according to claim 3, comprising the steps of: The suspending member is inserted through two adjacent fixed pulleys, and both ends of the suspending member are respectively connected to different suspending fittings of a plurality of suspending fittings attached to the deck slab, and the deck slab is hoisted using the deck slab hoisting device; The length of each of the plurality of hanging members is adjusted by the length adjustment jig so that the measurement values ​​of the load meters are as uniform as possible. A method for lifting a deck, comprising:

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