Concrete floor slab stripping device and method

Abstract

To provide a device and a method for separating and removing only an adhering portion of concrete from a flange of a steel girder without damaging the flange.SOLUTION: A device for separating a concrete floor slab for separating and crushing a concrete floor slab 10 from a steel girder 11 comprises: a U-shaped arm 26 comprising an upper arm 27, a lower arm 28, and a connecting portion 29 for loosely fitting an adhering portion 17 of concrete that is a part of the concrete floor slab 10 adhered to a flange 12 of the steel girder 11 remaining after cutting off the concrete floor slab 10 from the steel girder 11 and the flange 12 together; a vertical jack 34 attached to the upper arm 27; a gripper 43 attached downward to a piston rod 39 of the vertical jack 34 and pressing an upper surface of the adhering portion 17 of concrete to separate and crush; and a reaction force receiving member 35 attached to an upper surface of the lower arm 28 and in contact with a lower surface of the steel girder 11 to receive a reaction force of the gripper 43.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a concrete slab peeling device and method for peeling and removing a deteriorated concrete slab from a steel girder to which a reinforced concrete slab is joined. [Background technology]

[0002] Reinforced concrete decks can be divided into non-composite girders, in which the reinforced concrete deck and steel girders are joined using slab anchors or other means, and composite girders, in which the reinforced concrete deck and steel girders are integrated using stud dowels or other means. In the following description, a composite girder is exemplified, but the present invention is directed to general steel girders, including non-composite girders. As shown in Figure 8(a), a composite girder is constructed by welding a number of dowels 14, such as studs, to the flanges 12 of a steel girder 11, and laying a reinforced concrete deck 10 so that it is integrated with these dowels 14. In addition to serving as a deck that directly bears live loads, the deck also serves as part of the main girder in a composite girder. Therefore, if damage occurs to the deck, it has a significant impact on the function of the bridge, and this is the part that is most often repaired or reinforced. There are many types of dowels 14, including stud dowels as shown in Figure 8(a), horseshoe-shaped dowels with loop rebar welded to a channel as shown in Figure 8(b), dowels with hook-shaped rebar welded as shown in Figure 8(c), and dowels made of high-strength bolts as shown in Figure 8(d).

[0003] When attempting to remove an old concrete slab 10 from a steel girder 11 in order to lay a new concrete slab 10, in the case of a composite girder, a large number of dowels 14 are welded to the flanges 12 of the steel girder 11, and the concrete slab 10 is laid integrally with these dowels 14, so the old concrete slab 10 cannot be easily removed from the steel girder 11. Therefore, as shown in Figure 9, the concrete slab 10 is cut using a water cutter, wire saw, or the like, so as not to damage the steel girders 11. There are several ways to cut the concrete slab 10, including cutting the haunch portion 25 horizontally along the horizontal cutting line 16, or first cutting along the vertical cutting lines 15 on both sides of the flange 12, and then cutting the portion remaining on the flange 12 horizontally along the horizontal cutting line 16 at a position several centimeters thick. When cutting in this way, the concrete adhesion portion 17 that is in close contact with the flange 12 remains, along with part of the dowel 14. Conventionally, this remaining concrete adhesion portion 17 has been chipped away by manually operating a chipping tool. The chipping tool is operated manually and breaks up the concrete by vibrating and impacting the concrete, but the vibrations and impacts create a lot of noise and fatigue, which adversely affects the human body, so there is a limit to the amount of time that can be used. Another problem is that when breaking up the concrete, the cutting edge of the chipping tool is pushed into the flange 12, causing damage to the flange 12. In the above example, a method was described in which the concrete deck was cut horizontally and the remaining concrete adhesion portions were destroyed, but a method in which the concrete adhesion portions are crushed without cutting horizontally may also be used.

[0004] BACKGROUND ART A device is known for demolishing concrete pillars and concrete walls using a hydraulic jack instead of a chipping tool (Patent Document 1). As shown in Figure 10, this device involves attaching a U-shaped frame 18 consisting of a U-shaped upper frame 19 and lower frame 20 to a self-propelled shovel or the like, placing non-destructible concrete 24 such as a concrete pillar in the lower frame 20 for receiving the reaction force, rotating a screw shaft 21 attached to the upper frame 19 to bring it together with a hydraulic jack 22 toward the non-destructible concrete 24, and then extending the hydraulic jack 22 to drive a sharp tool 23 into the non-destructible concrete 24. As the sharp tool 23 advances, cracks occur in the non-destructible concrete 24, and the reinforcing bars are pulled and break due to stress concentration, allowing the sharp tool 23 to penetrate into the non-destructible concrete 24 and destroy it. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 49-2331 Summary of the Invention [Problem to be solved by the invention]

[0006] When the device described in Patent Document 1 is applied to peeling off the concrete adhesion portion 17 attached to the flange 12, the sharp tool 23 pierces the concrete adhesion portion 17, and further, when the sharp tool 23 is pushed in, the tip pierces the flange 12, not only damaging or damaging the steel girder 11 but also resulting in insufficient peeling of the concrete portion around the dowels 14 such as studs welded to the flange 12.

[0007] An object of the present invention is to provide an apparatus and method for peeling and removing only the portion of concrete adhering to a steel girder flange without damaging the flange. [Means for solving the problem]

[0008] The concrete floor slab peeling device according to claim 1, A concrete slab peeling device for peeling and crushing a concrete slab 10 from a steel girder 11, The upper arm 27, the lower arm 28, and the connecting portion 29 are joined to form a U-shaped arm. The concrete floor slab 10 is cut from the steel girder 11, and the concrete adhering portion 17 of the concrete floor slab 10 attached to the flange 12 of the remaining steel girder 11 is loosely fitted into the flange 12. The above a shaped arm 26; a jack 34 attached to the upper arm 27; The piston rod 39 of the jack 34 The thickness of the concrete adhesion portion 17 is not more than the thickness of the concrete adhesion portion 17. a gripper 43 attached to the concrete structure to press the concrete adhering portion 17 and break it up; a reaction force receiving member 35 attached to the lower arm 28 and in contact with the flange 12 to receive the reaction force of the gripper 43; Because the law of nature, The U-shaped arm 26 is made up of two pieces of approximately the same shape connected at a predetermined interval via a connecting member 31, and the jack 34 is attached to an upper gap 32 formed by the two upper arms 27 so as to be positionally adjustable, and the reaction force receiving member 35 is attached to a lower gap 33 formed by the two lower arms 28 so as to be positionally adjustable. It is characterized by:

[0010] A compression plate 41 is attached to the piston rod 39 of the jack 34, and one or more of the grippers 43 are detachably attached to the compression plate 41. The thickness of the concrete adhesion portion 17 is not more than the thickness of the concrete adhesion portion 17. It is characterized by being provided with

[0011] The jack 34 is characterized in that the upper arm 27 is clamped and fixed between a jack fixing metal fitting 36 and a jack support metal fitting 37.

[0012] The jack 34 is characterized in that it is provided in positioning holes 48 drilled at predetermined intervals in the upper arm 27 so that its position can be adjusted freely.

[0013] The reaction force receiving member 35 is characterized in that it is provided in positioning holes 49 bored at predetermined intervals in the lower arm 28 so that its position can be adjusted freely.

[0014] The grippers 43 are characterized in that one or more of them are screwed into a plurality of gripper insertion screw holes 44 formed in the compression plate 41, and one or more protrusions 45 are formed at the ends of the gripper insertion screw holes 44.

[0015] Claim Section 7 The concrete floor slab peeling method described above is as follows: The concrete floor slab peeling device according to claim 1 is used, A part of the concrete slab 10 attached to the flange 12 of the steel girder 11 The aforementioned a step of cutting the concrete floor slab 10 while leaving a concrete adhesion portion 17; The flange 12 and the concrete attachment portion 17 are connected by a U-shaped arm 26 consisting of an upper arm 27, a lower arm 28 and a connecting portion 29. The aforementioned a step of loosely fitting the fitting portion 30; a step of pressing the upper surface of the concrete adhering portion 17 with a gripper 43 of a vertical jack 34 attached to the upper arm 27 while receiving a reaction force by a reaction force receiving member 35 attached to the lower arm 28 in contact with the flange 12, thereby separating and crushing the concrete adhering portion 17 from the flange 12 of the steel girder 11; The present invention is characterized in that it comprises:

[0016] The concrete deck 10 is characterized in that it is joined to the steel girder 11 via dowels 14, such as those made of multiple studs, horseshoe-shaped channels with loop reinforcing bars welded to them, hook-shaped reinforcing bars welded to them, or high-strength bolts.

[0017] The step of separating and crushing the concrete adhering portion 17 from the flange 12 is characterized in that it is carried out sequentially at predetermined intervals in the length direction of the flange 12.

[0018] Two or more concrete slab peeling devices are arranged in parallel along the length of the flange 12 and the concrete adhesion portion 17 attached to this flange 12, and the multiple concrete slab peeling devices are driven to peel and crush the concrete adhesion portion 17. [Effects of the Invention]

[0019] According to the invention described in claim 1, A concrete slab peeling device that peels and crushes a concrete slab from a steel girder. The upper arm, the lower arm, and the connecting part of the U-shaped arm are fitted together. The concrete floor slab is attached to the flange of the remaining steel girder after the concrete floor slab is cut from the steel girder. The concrete floor slab is attached to the flange of the remaining ... The aforementioned A U-shaped arm, a jack attached to the upper arm; The piston rod of the jack The thickness of the concrete adhesion part is less than the a gripper attached to the concrete to press against the adhering portion of the concrete to separate and crush it; a reaction force receiving member attached to the lower arm and in contact with the flange to receive the reaction force of the gripper; Because the law of nature, The U-shaped arm is made up of two pieces of approximately the same shape connected at a predetermined interval with a connecting material interposed therebetween, and the jack is attached to the upper gap between the two upper arms so as to be positionally adjustable, and the reaction force receiving member is attached to the lower gap between the two lower arms so as to be positionally adjustable. This provides the following advantages: (1) Noise-free, silent crushing is possible, so there are no restrictions on use and it is not affected by the surrounding environment. Noise problems are reduced, especially when used in urban areas. (2) The gripper was attached so that it protruded below the thickness of the concrete. Only the portion of the concrete adhering to the flange can be peeled off and removed from the flange without damaging or injuring the flange of the steel girder. (3) By selecting the length of the hydraulic hose, the work can be carried out by leaving the electric pump in place, reducing the labor required. (4) In places where there is no power supply, it can be operated with a manual pump. (5) The height of the gripper can be easily adjusted to accommodate changes in the thickness of the remaining concrete. (6) The jack capacity can be easily changed, allowing specifications to be adapted to the concrete strength. (7) Concrete adhesion parts can be peeled and crushed not only on horizontal flanges but also on vertical or angled flanges. In addition, not only flat concrete adhesion parts but also curved concrete adhesion parts can be peeled and crushed. (8) The U-shaped arm consists of two approximately identical pieces connected at a predetermined distance by a connecting member, and the jack is attached in an adjustable position in the upper gap between the two upper arms, and the reaction force receiving member is attached in an adjustable position in the lower gap between the two lower arms, so the positions of the jack and the reaction force receiving member can be easily adjusted according to the width and size of the concrete adhesion area.In addition, concrete pieces that are separated and crushed from the concrete adhesion area are pushed toward the free end of the concrete in the width direction of the flange, etc., and do not remain in the concrete adhesion area, making it easy to remove the separated and crushed concrete pieces.

[0021] Claim Section 2 According to the invention described above, A compression plate is attached to the piston rod of the jack, and one or more of the grippers are detachably attached to the compression plate. The thickness of the concrete adhesion part is less than the By providing these grippers, the number of grippers can be optimally set according to the width, thickness, and size of the concrete adhesion area. Also, by adjusting the tip of the gripper to be equal to or smaller than the thickness of the concrete adhesion area, the compression plate comes into contact with the concrete adhesion area, so the tip of the gripper does not come into contact with the flange, preventing damage to the flange.

[0022] Claim Section 3 According to the invention described above, The jack is fixed by clamping the upper arm between a jack fixing bracket and a jack support bracket, so the position of the vertical jack can be adjusted according to the width, thickness, and size of the concrete adhesion area.

[0023] Claim Section 4 According to the invention described above, The jack is mounted in positioning holes drilled at predetermined intervals in the upper arm so that its position can be adjusted freely, so that the position of the jack can be easily adjusted according to the width, thickness and size of the concrete deposit.

[0024] Claim Section 5 According to the invention described above, The reaction force receiving member is freely position-adjustable in alignment holes drilled at predetermined intervals in the lower arm, so that the reaction force receiving member can be easily positioned according to the width, thickness, and size of the concrete adhesion portion.

[0025] Claim Section 6 According to the invention described above, The grippers are made by screwing one or more into a plurality of gripper insertion screw holes formed in the compression plate, and one or more protrusions are formed at the lower ends of the gripper insertion screw holes, so the number of grippers and their installation positions can be selected depending on the width, thickness, and size of the concrete adhesion area.

[0026] Claim Section 7 According to the invention described above, The concrete floor slab peeling device according to claim 1 is used, A part of the concrete slab attached to the flange of the steel girder The aforementioned a step of cutting and removing the concrete deck slab while leaving the concrete adhering portion; The flange and The aforementioned The concrete adhesion area, The aforementioned Upper arm and The aforementioned Lower arm and The aforementionedConsists of a connecting part The aforementioned U-shaped arm The aforementioned a step of loosely fitting the fitting portion; Attached to the lower arm The aforementioned A reaction force receiving member is attached to the upper arm while contacting the flange and receiving the reaction force. The aforementioned pressing the concrete adhesion portion with the gripper of the jack to separate and crush the concrete adhesion portion from the flange of the steel girder; Therefore, it has the same effect as the invention described in claim 1.

[0027] Claim Section 8 According to the invention described above, Concrete deck The cutting and removing step involves cutting and removing the steel girder and the concrete floor slab attached to the dowels, leaving the concrete-attached portion of the concrete floor slab attached to the dowels, which are laid and formed between the steel girder and the dowels. Concrete adhering to the flange can be easily removed.

[0028] Claim Section 9 According to the invention described above, The process of separating and crushing the concrete adhesion portion from the flange is carried out sequentially at predetermined intervals along the length of the flange, so that the concrete pieces separated and crushed from the concrete adhesion portion are pushed out sequentially into the gap between the two arms connected at a predetermined interval, and do not remain in the concrete adhesion portion, allowing the concrete to be separated and crushed efficiently.

[0029] Claim Section 10 According to the invention described above, Two or more flanges are provided in the longitudinal direction of the flange and the concrete attachment portion attached to the flange. The aforementioned Concrete slab stripping devices are installed in parallel and multiple devices are driven to strip and crush the adhered concrete portions. Normally, only one device is used, but if necessary, two or more devices can be installed in parallel, making it possible to strip and crush a wide area of ​​concrete with a single load, reducing work time and improving work efficiency. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is an exploded perspective view showing an embodiment of a concrete slab stripping device and method according to the present invention; [Figure 2] (a) is an oblique view of two grippers 43 attached to the left and right or top and bottom of a compression plate 41, (b) is an oblique view of one gripper 43 attached to the center of the compression plate 41, and (c) is an enlarged front view and bottom view showing an example in which multiple protrusions 45 are formed at the tip of the gripper 43. [Figure 3] 4(a) is a perspective view of a gripper 43 in which one side of the tip is cut into a tapered surface at a predetermined angle n, such as 30 degrees, 45 degrees, or 60 degrees, to form a protrusion 45; FIG. 4(b) is a perspective view of a gripper 43 in which half of the tip is cut into a tapered surface at a predetermined angle n, such as 30 degrees, 45 degrees, or 60 degrees, to form a protrusion 45; FIG. 4(c) is a perspective view of a gripper 43 in which both sides of the tip are cut into a tapered surface at a predetermined angle n, such as 30 degrees, 45 degrees, 60 degrees, or 90 degrees, to form a protrusion 45; FIG. 4(d) is a perspective view of a cylindrical gripper 43 of size M16, with a pointed tip that is conical at 90 degrees, a flat tip diameter of Φ4 mm, and a blade height h of 6 mm; and FIG. 4(e) is a perspective view of a cylindrical gripper 43 of size M16, with a flat two-stage rod tip with a tip diameter of Φ12 mm, and a blade height h of 8 mm. [Figure 4] (a) is a side view of the gripper 43 when set at the upper edge A near the free end of the concrete adhesion portion 17, (b) is a side view of the gripper 43 when set at the middle B of the concrete adhesion portion 17, and (c) is a side view of the gripper 43 when set at the center C of the concrete adhesion portion 17. [Figure 5] (a) is a plan view showing that one edge portion A in Figure 4(a) has been sequentially peeled and crushed, and the shaded portion has been crushed; (b) is a plan view showing that the middle portion B in Figure 4(b) has been sequentially peeled and crushed, and the shaded portion has been crushed; (c) is a plan view showing that the other edge portion A' in Figure 4(a) has been sequentially peeled and crushed, and the shaded portion has been crushed; and (d) is a plan view showing that after the A, B, and A' portions have been sequentially peeled and crushed, the remaining concrete adhesion portion 17 in the shaded portion around the dowel 14 at the center C has been crushed. [Figure 6] (a) is a side view of a flat concrete adhesion portion 17 being peeled and crushed with a gripper 43, (b) is a side view of the concrete adhesion portion 17 being peeled and crushed to a certain extent after it has been peeled and crushed to a certain extent, when many uneven surfaces remain, with a gripper 43 having protrusions 45 of 45 degrees or 90 degrees as shown in Figure 3(c), and (c) is a side view of the concrete adhesion portion 17 being peeled and crushed when it remains around a dowel 14 with a gripper 43 having sharp protrusions 45 of 45 degrees or more as shown in Figure 3(a). [Figure 7] FIG. 2 is a side view of two concrete slab peeling devices of the present invention set side by side. [Figure 8] (a) is an oblique view of a concrete composite girder in which a concrete deck slab 10 is laid on a steel girder 11 using a stud dowel 14; (b) is an oblique view showing an example in which a horseshoe-shaped dowel 14 with loop rebar welded to a channel is welded to the steel girder 11; (c) is an oblique view showing an example in which a hook-shaped rebar dowel 14 is welded to the steel girder 11; and (d) is an oblique view showing an example in which a high-strength bolt dowel 14 is used on the steel girder 11. [Figure 9] This is a cross-sectional view of a deteriorated concrete deck 10 after cutting, leaving a concrete adhesion portion 17 on a flange 12. [Figure 10] 1 is an explanatory diagram of a conventional device for destroying concrete pillars and the like. DETAILED DESCRIPTION OF THE INVENTION

[0031] The concrete floor slab peeling device of the present invention is A concrete slab peeling device for peeling and crushing a concrete slab 10 from a steel girder 11, a U-shaped arm 26 consisting of an upper arm 27, a lower arm 28, and a connecting portion 29 for loosely fitting the flange 12 into a concrete attachment portion 17 of the concrete floor slab 10 attached to the flange 12 of the remaining steel girder 11 obtained by cutting the concrete floor slab 10 from the steel girder 11; a jack 34 attached to the upper arm 27; a gripper 43 attached to the piston rod 39 of the jack 34 to press against the concrete adhering portion 17 to separate and crush it; a reaction force receiving member 35 attached to the lower arm 28 and in contact with the steel girder 11 to receive the reaction force of the gripper 43; It consists of:

[0032] The U-shaped arm 26 is made up of two approximately identical pieces connected at a predetermined distance via a connecting member 31, and the vertical jack 34 is attached to the upper gap 32 formed by the two upper arms 27 so that its position can be adjusted freely, and the reaction force receiving member 35 is attached to the lower gap 33 formed by the two lower arms 28 so that its position can be adjusted freely.

[0033] A compression plate 41 is attached to the piston rod 39 of the jack 34, and one or more grippers 43 are detachably provided on the compression plate 41.

[0034] The jack 34 is fixed by clamping the upper arm 27 between a jack fixing metal fitting 36 and a jack support metal fitting 37 .

[0035] The vertical jack 34 is provided in positioning holes 48 drilled at predetermined intervals in the upper arm 27 so that its position can be adjusted freely.

[0036] The reaction force receiving member 35 is provided in positioning holes 49 bored at predetermined intervals in the lower arm 28 so that its position can be adjusted freely.

[0037] One or more of the grippers 43 are screwed into a plurality of gripper insertion screw holes 44 formed in the compression plate 41, and one or more protrusions 45 are formed at the lower end of the gripper insertion screw holes 44.

[0038] The concrete floor slab peeling method of the present invention for peeling and crushing the concrete floor slab 10 from the steel girder 11 includes the following steps: a step of cutting the concrete slab 10 while leaving a concrete adhesion portion 17 of the concrete slab 10 attached to the flange 12 of the steel girder 11; a step of loosely fitting the flange 12 and the concrete attachment portion 17 into a fitting portion 30 of a U-shaped arm 26 consisting of an upper arm 27, a lower arm 28, and a connecting portion 29; a step of pressing the concrete adhering portion 17 with a gripper 43 of a jack 34 attached to the upper arm 27 while receiving a reaction force by a reaction force receiving member 35 attached to the lower arm 28 in contact with the flange 12, thereby separating and crushing the concrete adhering portion 17 from the concrete floor slab 10; It consists of:

[0039] The concrete deck 10 is formed by pouring and placing dowels 14, such as those made of multiple studs, horseshoe-shaped channels with loop reinforcing bars welded to them, hook-shaped reinforcing bars welded to them, or high-strength bolts, on the steel girders 11.

[0040] The step of separating and crushing the concrete adhering portion 17 from the flange 12 is carried out sequentially at predetermined intervals in the length direction of the flange 12.

[0041] Two or more concrete slab peeling devices are arranged in parallel along the length of the flange 12 and the concrete adhesion portion 17 attached to this flange 12, and the multiple concrete slab peeling devices are driven to peel and crush the concrete adhesion portion 17. [Example]

[0042] In Figure 1, two U-shaped arms 26 are each formed into a U-shape by an upper arm 27, a connecting portion 29, and a lower arm 28. These two U-shaped arms 26 are fixed at the connecting portion 29 with a tubular connecting member 31 sandwiched between them and bolted to a distance of, for example, 70 mm. An upper gap 32 is formed at the tip portions of the two upper arms 27, and a lower gap 33 is formed at the tip portions of the two lower arms 28. A vertically extendable vertical jack 34 is attached facing downward in the upper gap 32. Furthermore, a reaction force receiving member 35 having a tip 35a on its upper surface is attached to the upper edge of each of the lower arms 28.

[0043] A jack fixing bracket 36 with flanges on both ends is attached to the lower end of the cylinder 34a of the vertical jack 34 so as to fit from below the two upper arms 27, and a jack fixing ring 38 is fitted and fixed from below this jack fixing bracket 36, with a piston rod 39 protruding from below. A jack support bracket 37 is fitted into the top of the cylinder 34a, and the jack fixing bracket 36 and jack support bracket 37 clamp the upper arms 27 from above and below, adjust their position, and fix them with bolts. Pressure oil ports 53 and 54 are provided on the upper and lower sides of the cylinder 34a. A jack head plate 40 is fitted onto the lower end of the piston rod 39, and the lower end of this jack head plate 40 is fitted into a fitting hole 42 of a disk-shaped compression plate 41. This compression plate 41 is provided with vertical gripper insertion screw holes 44 at 90-degree intervals in the center and on its outer periphery. As shown in FIG. 2(a), two grippers 43 are screwed into the gripper insertion screw hole 44 of this compression plate 41, spaced 180 degrees apart and protruding a predetermined distance from below. Alternatively, as shown in FIG. 2(b), one gripper 43 is screwed into the gripper insertion screw hole 44 in the center, protruding a predetermined distance from below. The number and screw positions of the grippers 43 are not limited to the illustrated example and may be set as appropriate.

[0044] 2(c), the gripper 43 has a plurality of quadrangular pyramidal protrusions 45 formed at the lower end thereof, and a hexagonal bolt hole 46 formed at the upper end thereof. With the compression plate 41 attached to the vertical jack 34, the jack fixing bracket 36 and the jack support bracket 37 are fitted into the upper gap 32 from the side so as to sandwich the upper arm 27 from above and below. After fitting, two positioning pins 47 are inserted into alignment holes 48 on both sides of the vertical jack 34 to position it, and after positioning, the jack fixing bracket 36 and the jack support bracket 37 are fastened to the upper arm 27 with bolts. A pressure oil pipe of an electric pump 51 is connected to a pressure oil port 53 and a pressure oil port 54 of the vertical jack 34. The electric pump 51 is connected to a generator 50, and switching of the pressure oil is controlled by an operation remote controller 52. The electric pump 51 can also be a manual pump. The tongues 35b of the reaction force receiving members 35 that receive the reaction force are fitted onto the upper edges of the lower arms 28, and the reaction force receiving members 35 are positioned in one of the alignment holes 49 and attached with bolts.

[0045] Examples of different shapes of the gripper 43 are shown in FIG. The gripper 43 in FIG. 1(a) shows an example in which one surface of the tip is cut into a tapered surface at a predetermined angle n, such as 30 degrees, 45 degrees, or 60 degrees, to form a protrusion 45. The gripper 43 in FIG. 4(b) shows an example in which half of the tip end is cut into a tapered surface at a predetermined angle n, such as 30 degrees, 45 degrees, or 60 degrees, to form a protrusion 45. The gripper 43 in FIG. 4(c) shows an example in which protrusions 45 are formed by cutting both surfaces of the tip into tapered surfaces at a predetermined angle n, such as 30 degrees, 45 degrees, 60 degrees, or 90 degrees. The gripper 43 in (d) shows an example in which the angle n of the pointed tip of the cylindrical gripper 43 of size M16 is conical at 90 degrees, the tip diameter is flat with Φ4 mm, and the blade height h is 6 mm. The gripper 43 in (e) shows an example in which the tip of the cylindrical gripper 43 of size M16 is a flat two-stage rod tip with a tip diameter of Φ12 mm and a blade height h of 8 mm.

[0046] The operation of removing and removing the concrete adhering portion 17 adhering to the flange 12 using the concrete slab removing device configured as above will now be described. Peeling action at one edge A in Figure 4(a) In Figure 4(a), the position of the reaction force receiving member 35 is fixed in the positioning hole 49 on the tip side of the lower arm 28, and the vertical jack 34 is aligned so that it coincides with the vertical line of this reaction force receiving member 35 and positioned with two positioning pins 47, and is fixed to the upper arm 27 with the jack fixing bracket 36 and the jack support bracket 37. At this time, the fixing screw position of the reaction force receiving member 35 is the position of the black circle in the positioning hole 49 shown in Figure 4(a), and the position of the positioning pin 47 is the position of the black circle in the positioning hole 48.

[0047] In Figure 5(a), the piston rod 39 of the vertical jack 34 is pushed down so that the center of the compression plate 41 is positioned at A1 of A of the concrete adhesion portion 17, and the concrete adhesion portion 17 and the flange 12 are clamped between the compression plate 41 and the reaction force receiving member 35, and the U-shaped arm 26 is fixed. After the U-shaped arm 26 is fixed to A1, the piston rod 39 of the vertical jack 34 is further pushed down to cause the gripper 43 to sink into the concrete adhesion portion 17, thereby peeling and crushing the concrete adhesion portion 17 attached to the flange 12 as shown by the diagonal lines.

[0048] Here, the distance by which the tip of the gripper 43 protrudes from the lower surface of the compression plate 41 is adjusted to be equal to or less than the thickness of the concrete adhesion portion 17. As a result, when the lower surface of the compression plate 41 comes into contact with the upper surface of the concrete adhesion portion 17, the tip of the gripper 43 does not come into contact with the flange 12, and the flange 12 is not damaged. Because the projections 45 of the gripper 43 have a small diameter, the compressive load of the vertical jack 34 is transmitted to the gripper 43, applying high compressive stress to the gripper 43, which peels and crushes the adhering concrete portion 17. The projections 45 of the gripper 43 are composed of five to ten quadrangular pyramids, and the gripper 43 is attached to the compression plate 41. By setting the protruding height of the gripper 43 to be equal to or less than the thickness of the adhering concrete portion 17, the protrusions 45 are peeled and crushed without reaching the surface of the flange 12. When the piston rod 39 of the vertical jack 34 is pressed down, the two reaction force receiving members 35 on the lower arm 28 are attached approximately 70 mm apart, but as shown in FIG. 5(a), a crack is generated in the direction from the gripper 43 toward the two reaction force receiving members 35, exceeding the distance between these two reaction force receiving members 35, thereby more effectively peeling the adhering concrete portion 17. It is desirable to set the stroke of the piston rod 39 so that the amount of descent of the gripper 43 does not reach the surface of the flange 12. Furthermore, because some stud dowels and other dowels 14 remain in the concrete adhesion portion 17, it is desirable to set the gripper 43 so as to be positioned around the dowels 14 so as not to come into contact with the stud dowels and other dowels 14. The concrete pieces that are separated and crushed at position A1 are pushed out toward the free end of the concrete, such as in the width direction of the flange, in the gap between the two arms connected at a predetermined distance, and do not remain on the concrete adhesion portion 17.

[0049] After peeling and crushing at the A1 position, the gripper 43 is raised, the U-shaped arm 26 is moved so that the gripper 43 is positioned at the A2 position, and peeling and crushing is performed in the same manner as above. When the peeling position of the concrete adhesion portion 17 is directly above the vertical stiffener 13, such as position A4, the vertical stiffener 13 is inserted into the lower gap 33 of the two lower arms 28 to peel and crush the concrete adhesion portion 17. The same process is repeated until the other end An is peeled and crushed.

[0050] Peeling action at the middle part B in Figure 4(b) When the peeling operation at one edge A of the concrete adhesion portion 17 in Figures 4(a) and 5(a) is completed, as shown in Figure 4(b), the relative positions of the reaction force receiving member 35 and the vertical jack 34 are maintained in the same position as in Figure 4(a), and the concrete deck peeling device is moved to position B1 in the middle portion B of Figure 5(b). In the same manner as above, the sections are peeled and crushed in order from B1 to Bn at the other end as shown by the hatched areas.

[0051] Peeling action at the other edge A' in Figure 4(c) After the peeling and crushing on one side A, B of the concrete adhesion portion 17 is completed, as shown in Figure 5(c), the other edge portion A' is peeled and crushed sequentially from A1' to the other end An' as indicated by the diagonal line. The above-mentioned peeling and crushing at A, B, and A' leaves a concrete adhesion portion 17 around the dowel 14.

[0052] Peeling action at the center C in Figure 4(c) The gripper 43 is positioned at the center C in Figure 4(c), and as shown in Figure 5(d), the concrete adhesion portion 17 remaining around the dowel 14 is peeled off and crushed sequentially from C1 to the other end Cn as shown by the hatched area. 4(c), when the position is set to the center C, the reaction force receiving member 35 of the lower arm 28 cannot be aligned with the center line C due to the central web plate of the steel girder 11. Therefore, the reaction force receiving member 35 is inserted to the deepest position below the flange 12, and only the vertical jack 34 is moved to the black circle position of the alignment hole 48 so that it is aligned with the center line C, and then fixed. In the above example, the order of peeling and crushing was first one edge side, then the other edge side, and finally the center, but this is not limited to this, and it is also possible to first peel and crush one edge side, then the center, and finally the other edge side.

[0053] 5(a), (b), (c), and (d) are shown in four rows of peeling and crushing points indicated by x marks, but the number is not limited to this and may be three rows, five rows, or more depending on the width and thickness of the concrete adhesion portion 17, the position and number of dowels 14, the number of grippers 43, etc. The spacing between the peeling and crushing points is also not limited to the example shown, and it is desirable to find a method that can peel and crush the concrete most efficiently and reliably by changing the number of grippers 43 depending on the width and thickness of the concrete adhesion portion 17. [Example]

[0054] In the above embodiment, one concrete slab peeling device was used to perform the peeling and crushing work, but as shown in Figure 7, two concrete slab peeling devices and methods can be set side by side to perform the peeling and crushing work. For example, the inner spacing between the two U-shaped arms 26 is 70 mm, and the spacing between the two concrete slab peeling devices and methods is set to 170 mm. These dimensions are merely examples and are not limiting. The number of concrete slab peeling devices may be three or more.

[0055] In the above embodiment, as shown in Figures 2(a) and 2(b), an example in which two grippers 43 are attached to the compression plate 41 and an example in which one gripper 43 is attached are shown, but this is not limited to this, and one, two, three, four, five, etc. can be selected as appropriate depending on the location of use, such as the end or center of the concrete adhesion portion 17 or around the stud dowel 14.

[0056] In the above embodiment, as shown in Figure 2(c), the protrusions 45 of the gripper 43 attached to the compression plate 41 are an example of about 10 quadrangular pyramids, which is mainly used when peeling and crushing flat concrete adhesion portions 17, as shown in Figure 4(a). However, the present invention is not limited to this example, and various shapes such as those shown in FIGS. 3(a), (b), (c), (d), and (e) may be used. Figure 3(a) shows an oblique view of a gripper 43 with a protrusion 45 formed by cutting a tapered surface at a specified angle n, such as 30 degrees, 45 degrees, or 60 degrees, from one side of the tip of the gripper 43. The gripper 43 with the sharp protrusion 45 in this example is mainly used when a concrete adhesion portion 17 remains around the dowel 14, as in Figure 5(d), but can also be used in places where there is no dowel 14, as in Figures 4(a) and (b). Figure 3(c) shows a gripper 43 in which both sides of the tip are cut into tapered surfaces at a specified angle n, such as 30 degrees, 45 degrees, 60 degrees, or 90 degrees, to form a protrusion 45.This is used when, as shown in Figure 4(b), many uneven surfaces remain after the concrete adhesion portion 17 has been peeled and crushed to a certain extent, but the use is not limited to this example. FIG. 3(d) shows a cylindrical gripper 43 of size M16 with a 90-degree conical tip, a flat tip diameter of Φ4 mm, and a blade height h of 6 mm. FIG. 3(e) shows a cylindrical gripper 43 of size M16, with the tip thereof being a flat two-stage rod tip with a tip diameter of Φ12 mm and a blade height h of 8 mm.

[0057] In the above example, a vertical jack was used to remove and crush the horizontal concrete adhesion portion 17 remaining on the horizontal flange 12 of the steel girder 11. However, when removing and crushing a non-horizontal concrete adhesion portion 17 attached to a vertical or inclined flange 12, the U-shaped arm 26 can be adjusted to the angle of the flange 12 and clamped together with the concrete adhesion portion 17 to remove and crush it.

[0058] In the above embodiment, the case of a composite girder has been described, but the present invention may also be applied to general steel girders including non-composite girders. In the above example, the concrete adhesion portion 17 was described as peeling and crushing the remaining portion after cutting the concrete deck 10 along a horizontal cutting line 16 several centimeters thick above the flange 12, but this also includes cases where the concrete portion is crushed without cutting horizontally. [Explanation of symbols]

[0059] 10...Concrete deck, 11...Steel girder, 12...Flange, 13...Vertical stiffener, 14...Stud or other dowel, 15...Vertical cutting line, 16...Horizontal cutting line, 17...Concrete attachment portion, 18...U-shaped frame body, 19...Upper frame, 20...Lower frame, 21...Screw shaft, 22...Hydraulic jack, 23...Sharp tool, 24...Non-destructive concrete, 25...Haunch portion, 26...U-shaped arm, 27...Upper arm, 28...Lower arm, 29...Connecting portion, 30...Fitting portion, 31...Connecting material, 32...Upper gap, 33...Lower gap, 34...vertical jack, 35...reaction force receiving member, 36...jack fixing bracket, 37...jack support bracket, 38...jack fixing ring, 39...piston rod, 40...jack head plate, 41...compression plate, 42...fitting hole, 43...gripper, 44...gripper insertion screw hole, 45...protrusion, 46...hexagonal bolt hole, 47...positioning pin, 48...alignment hole, 49...alignment hole, 50...generator, 51...electric pump, 52...operation remote control, 53...pressure oil port, 54...pressure oil port, 55...handle.

Claims

1. A concrete slab peeling device that peels and crushes a concrete slab from a steel girder. a U-shaped arm consisting of an upper arm, a lower arm, and a connecting portion, for loosely fitting together a concrete attachment portion of a portion of the concrete deck attached to a flange of the remaining steel girder after the concrete deck has been cut from the steel girder and the flange; a jack attached to the upper arm; a gripper attached to the piston rod of the jack so as to protrude to a thickness equal to or less than the thickness of the concrete adhering portion, and pressing against the concrete adhering portion to separate and crush it; a reaction force receiving member attached to the lower arm and in contact with the flange to receive the reaction force of the gripper; It consists of The U-shaped arms are made up of two approximately identical arms connected at a predetermined distance by a connecting material, and the jack is attached to the upper gap between the two upper arms so that its position can be adjusted freely, and the reaction force receiving member is attached to the lower gap between the two lower arms so that its position can be adjusted freely.

2. A concrete floor slab peeling device as described in claim 1, characterized in that a compression plate is attached to the piston rod of the jack, and one or more of the grippers are detachably attached to this compression plate and protrude below the thickness of the concrete adhesion portion.

3. 3. The concrete slab peeling device according to claim 1, wherein the jack is fixed by clamping the upper arm with a jack fixing bracket and a jack support bracket.

4. 4. A concrete slab peeling device according to claim 1, 2 or 3, wherein the jacks are provided in position-adjustable positions in alignment holes drilled at predetermined intervals in the upper arm.

5. 4. A concrete slab peeling device according to claim 1, 2 or 3, wherein the reaction force receiving member is provided in positioning holes drilled at predetermined intervals in the lower arm so that the position can be adjusted freely.

6. The concrete floor slab peeling device according to claim 2, characterized in that one or more of the grippers are screwed into a plurality of gripper insertion screw holes formed in the compression plate, and one or more protrusions are formed at the lower end of the gripper insertion screw holes.

7. The concrete floor slab peeling device according to claim 1 is used, a step of cutting and removing the concrete slab while leaving a portion of the concrete adhering to the flange of the steel girder; a step of loosely fitting the flange and the concrete attachment portion into the fitting portion of the U-shaped arm consisting of the upper arm, the lower arm, and the connecting portion; a step of pressing the concrete adhesion portion with the gripper of the jack attached to the upper arm while the reaction force receiving member attached to the lower arm comes into contact with the flange and receives a reaction force, thereby separating and crushing the concrete adhesion portion from the flange of the steel girder; A method for removing a concrete floor slab, comprising:

8. A method for removing a concrete slab as described in claim 7, characterized in that the process of cutting and removing the concrete slab comprises cutting and removing the concrete slab while leaving the concrete-adhered portion of the concrete slab attached to the steel girder and the dowels, which are laid and formed with multiple dowels interposed between the steel girder and the dowels.

9. 9. The method for removing a concrete slab according to claim 7, wherein the step of removing and crushing the concrete-adhered portion from the flange is carried out sequentially at predetermined intervals in the length direction of the flange.

10. A concrete slab peeling method as described in claim 7, 8 or 9, characterized in that two or more concrete slab peeling devices are arranged in parallel in the longitudinal direction of the flange and the concrete adhesion portion attached to the flange, and the multiple concrete slab peeling devices are driven to peel and crush the concrete adhesion portion.

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