Bridge cap beam through core rod dismantling method

Abstract

The present application relates to a kind of bridge bent cap through core rod dismantling method.1) Compared with the traditional method of using crane to drag for dismantling, the method is more labor-saving and convenient by using hoist and crane to cooperate, and will not cause damage to the concrete around the reserved hole of pier column;2) Compared with the traditional method of using binding type fixed steel rod method, the present application sets lifting hole at one end of through core rod, which ensures that steel rod will not fall off during lifting and lowering without affecting the stress of steel rod;3) In the present application, crane hook is lifted to the end of crane arm, which can avoid the swing of crane hook during the process of pulling hoist chain, and ensure that steel rod is pulled along a straight line;4) In the present application, operator can operate on the top of bent cap, without using basket to carry out high-altitude operation, which is safer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge bent cap or column bent cap construction, and particularly relates to a bridge bent cap core rod dismantling method. BACKGROUND

[0002] For bridge bent cap or column bent cap construction, two construction methods of core rod method and hoop method are usually adopted. The hoop method is only applicable to cylindrical piers, and the core rod method is applicable to not only cylindrical piers but also square piers and rectangular piers. The core rod method is to reserve a core rod installation hole before pouring concrete of the pier column, then install a steel rod (the diameter of the steel rod is generally 10-15 cm, and the length is 1.8-2.8 m) as a support structure, install a unloading device on the steel rod, and then install a main cross beam and a distribution beam as a support structure of a formwork.

[0003] Since the steel rod is heavy, manual dismantling is difficult, and a crane is usually used to directly pull and dismantle the steel rod, which has high construction safety risk and can cause damage to the pier column. SUMMARY

[0004] In view of the above problems, the present application provides a more labor-saving and convenient bridge bent cap core rod dismantling method to effectively prevent the steel rod from falling off during hoisting.

[0005] The specific technical scheme is as follows:

[0006] A bridge bent cap core rod dismantling method comprises the following steps:

[0007] A lifting hole is arranged at one end of the core rod;

[0008] Before dismantling the bent cap formwork and the steel platform, the first dismantling rod in the connecting piece is arranged in the lifting hole, and then the first dismantling rod is fastened to the connecting piece;

[0009] The length of the lifting chain in the hand-operated hoist is adjusted to be the same as the length of the core rod, the lower lifting hook in the hand-operated hoist is hung on the second dismantling rod in the connecting piece, and the hand-operated chain in the hand-operated hoist is temporarily fixed to the top of the bent cap;

[0010] The bent cap formwork and the steel platform are dismantled by a crane;

[0011] The crane arm is started, the crane hook is lifted to the top of the bent cap, and the upper lifting hook of the hand-operated hoist is hung on the crane hook;

[0012] The crane arm is adjusted so that the crane hook is lifted to the top end of the crane arm, and the lifting chain is kept horizontal at the same time;

[0013] The hand-operated chain is pulled by an operator at the top of the bent cap, the core rod is slowly pulled out, the crane is started after the core rod is completely pulled out, and the core rod and the hand-operated hoist are lowered to the ground, thereby completing the dismantling.

[0014] Specifically, the connecting piece further comprises a connecting frame, and the first and second dismantling rods are correspondingly arranged and fixed on the connecting frame.

[0015] Specifically, the first dismantling rod is fixed on the connecting frame by a nut.

[0016] Specifically, the second dismantling rod is fixed on the connecting frame by a nut.

[0017] Specifically, the connecting frame is formed by welding a steel plate.

[0018] The above scheme has the following advantages:

[0019] 1) Compared with the traditional method of using a crane to drag for dismantling, the present method uses a hoist and a crane to cooperate, which is more labor-saving and convenient, and does not cause damage to the concrete around the reserved hole of the pier column;

[0020] 2) Compared with the traditional method of using a hoist and a crane to cooperate, the present method sets a lifting hole at one end of the through rod, which ensures that the steel rod will not fall off during lifting and lowering without affecting the stress of the steel rod;

[0021] 3) In the present application, the crane hook is lifted to the end of the crane arm, which can avoid the swinging of the crane hook during the dragging of the hand-pulled chain, and ensure that the steel rod is dragged along a straight line;

[0022] 4) In the present application, the operator can operate on the top of the cap beam, without the need to ride a basket for high-altitude operation, which is safer. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The present application provides a dismantling schematic diagram in the embodiment;

[0024] Figure 2 The present application provides a structure schematic diagram of the through rod in the embodiment;

[0025] Figure 3 The present application provides a structure schematic diagram of the connecting piece in the embodiment.

[0026] In the drawings: 1, through rod; 2, lifting hole; 3, connecting piece; 31, first dismantling rod; 32, second dismantling rod; 33, connecting frame; 4, hoist; 41, lifting chain; 42, lower hook; 43, hand-pulled chain; 44, upper hook; 5, cap beam; 6, crane arm. DETAILED DESCRIPTION

[0027] With reference to the drawings and specific embodiments, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0029] The present application will be further described below in combination with the drawings and specific embodiments, but is not limited to the present application.

[0030] As shown in Figure 1 , Figure 2 , Figure 3 The bridge bent cap through rod dismantling method provided in the embodiments of the present application comprises the following steps:

[0031] A lifting hole 2 is arranged at one end of the through rod 1;

[0032] Before the bent cap formwork and the steel platform are dismantled, the first dismantling rod 31 in the connecting piece 3 is arranged in the lifting hole 2, and then the first dismantling rod 31 is fastened to the connecting piece 3 by means of a nut;

[0033] The length of the hoisting chain 41 in the hand-operated hoist 4 is adjusted to be the same as the length of the through rod 1 (to ensure that the steel rod can be pulled out at one time), the lower lifting hook 42 in the hand-operated hoist 4 is hung on the second dismantling rod 32 in the connecting piece 3, and the hand-pulling chain 43 in the hand-operated hoist 4 is temporarily fixed to the top of the bent cap 5;

[0034] The bent cap 5 formwork and the steel platform are dismantled by means of a crane;

[0035] The crane arm 6 is started, the crane hook is lifted to the top of the bent cap 5, and the upper lifting hook 44 of the hand-operated hoist 4 is hung on the crane hook;

[0036] The crane arm 6 is adjusted to lift the crane hook to the top end of the crane arm 6, while ensuring that the hoisting chain 41 remains horizontal;

[0037] The hand-pulling chain 43 is pulled by an operator at the top of the bent cap 5, so that the through rod 1 is slowly pulled out with the crane arm 6 as a fulcrum, and after the through rod 1 is completely pulled out, the crane is started to lower the through rod 1 and the hand-operated hoist 4 to the ground, thereby completing the dismantling.

[0038] Compared with the traditional method of using a crane to pull for dismantling, the present method uses the hand-operated hoist 4 and the crane to cooperate, which is more labor-saving and convenient, and will not cause damage to the concrete around the pier column reserved hole.

[0039]

[0039] Compared with the binding type fixing steel rod method used in the traditional demolition method, the present application sets a lifting hole 2 at one end of the through rod 1, which ensures that the steel rod will not fall off during the lifting and lowering process without affecting the stress of the steel rod.

[0040] As shown in Figure 3 The connecting piece 3 also includes a connecting frame 33, and the first demolition rod 31 and the second demolition rod 32 are correspondingly threaded on the connecting frame 33 and then fastened on the connecting frame 33 by using nuts.

[0041] The above is only the preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A method of removing a bridge bent crosstie, comprising: The utility model relates to a connecting piece for removing a cover beam formwork and steel platform, which comprises: a lifting hole is arranged at one end of a through rod; a first removing rod in the connecting piece is arranged in the lifting hole before the cover beam formwork and the steel platform are removed, and then the first removing rod is fastened to the connecting piece; the length of a lifting chain in a hand-operated hoist is adjusted to be the same as the length of the through rod, and then a lower hook in the hand-operated hoist is hung on a second removing rod in the connecting piece, and a hand-operated chain in the hand-operated hoist is temporarily fixed to the top of the cover beam; the cover beam formwork and the steel platform are removed by a crane; the crane arm is started, the crane hook is lifted to the top of the cover beam, and an upper hook of the hand-operated hoist is hung on the crane hook; the crane arm is adjusted, the hook is lifted to the top end of the crane arm, and the lifting chain is kept horizontal; workers pull the hand-operated chain at the top of the cover beam, slowly pull out the through rod, and then the crane is started to lower the through rod and the hand-operated hoist to the ground, and the removal is completed.

2. The method of claim 1, wherein, The connecting piece further comprises a connecting frame, and the first removing rod and the second removing rod are arranged in the connecting frame.

3. The method of claim 2, wherein, The first removing rod is fixed to the connecting frame by a nut.

4. The method of claim 2, wherein, The second removing rod is fixed to the connecting frame by a nut.

5. The method of claim 2, wherein, The connecting frame is formed by welding a steel plate.

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