Transportation method for dismantling formwork in narrow space of prefabricated small box girder

Abstract

The present application relates to a kind of precast small box girder narrow space inside template removal transport method, comprising the following steps: a, precast small box girder (2) both ends install pulley assembly (4), the steel wire rope (3) of winch (1) is passed through pulley assembly (4), steel wire rope (3) is equipped with hook (6);B, remove template (5), hook (6) hoist template (5);C, start winch (1), template (5) is transported to port;D, unload template (5), reverse start winch (1), so that hook (6) reset;E, repeat c to e to template (5) removal.By setting pulley assembly (4), form the template (5) transport mechanism of rotation, control winch (1) positive and negative work, can be achieved in precast small box girder (2) inside fast reverse transport template (5) of removal.Solve the traditional method using manpower and mechanical drag, construction efficiency is low, construction dangerous coefficient is high, damage precast small box girder internal concrete problem.

Description

TECHNICAL FIELD

[0001] The present application relates to a prefabricated small box girder narrow space inside the template removal transportation method, belongs to the field of bridge construction technology. BACKGROUND

[0002] With the accelerated construction of China's infrastructure, especially the prefabricated construction of highway prefabricated small box girder, which becomes the key step to restrict the rapid construction on site, how to speed up the prefabrication of box girder, speed up the prefabricated small box girder internal narrow space formwork removal speed, improve the construction efficiency and reduce the construction risk has been a difficult problem that has plagued the site workers. The traditional process of prefabricated small box girder internal formwork removal and transportation mainly relies on manpower lifting and mechanical dragging, which has low construction efficiency, high construction risk coefficient, and often damages the internal concrete of prefabricated box girder. Therefore, it is an important step to set up a prefabricated small box girder internal narrow space formwork removal and transportation method for the rapid, efficient and safe transportation of such prefabricated small box girder internal formwork removal construction.

[0003] At present, the building formwork transportation device disclosed in the domestic patent CN218805985U and the building formwork transportation device disclosed in the domestic patent CN218400580U both adopt screw transmission. Since the conveying length of both is limited and the cost is relatively high, they cannot be actually used for prefabricated small box girder internal narrow space formwork removal and transportation operation. SUMMARY

[0004] The technical problem to be solved by the present application is that the traditional method adopts manpower lifting and mechanical dragging, which has low construction efficiency, high construction risk coefficient and damages the internal concrete of prefabricated small box girder.

[0005] The technical solution adopted by the present application to solve the technical problem is: a prefabricated small box girder internal narrow space formwork removal and transportation method, comprising the following steps:

[0006] a. Installing a pulley assembly at both ends of the prefabricated small box girder, and winding the steel wire rope of the winch through the pulley assemblies at both ends of the prefabricated small box girder in sequence, and installing a hook on the steel wire rope inside the prefabricated small box girder;

[0007] b. Removing the formwork and lifting the formwork through the hook;

[0008] c. Starting the winch to transport the formwork to one end of the prefabricated small box girder;

[0009] d. Unloading the formwork, reversing the winch, and re-entering the hook into the prefabricated small box girder;

[0010] e. Repeating steps c to e to complete the formwork removal.

[0011] In the above method, the winch in step a is arranged at the upper middle part of the prefabricated small box girder.

[0012] The pulley assembly in the method comprises a fixing part, a pulley and a support, the fixing part is fixed at the upper end of the prefabricated small box girder, one end of the support is connected with the fixing part, the pulley is rotatably arranged at the end of the support away from the fixing part, and the steel wire rope is embedded in the pulley groove.

[0013] Further, the fixing part in the method is in L-shaped structure, and two fixing parts are oppositely arranged, the inner walls of the fixing parts are in contact with the side walls of the ports of the prefabricated small box girders, the outer walls of the fixing parts are provided with connecting parts, connecting bolts are arranged on the connecting parts, and nuts are arranged outside the connecting parts, and one end of the support is connected with the connecting part.

[0014] Further, the inner walls of the fixing parts are provided with rubber pads.

[0015] Further, the connecting part in the method is in U-shaped structure, and the bottom surface of the connecting part is provided with a penetrating hole, and the shank of the connecting bolt is arranged in the penetrating hole.

[0016] Further, the support in the method has three groups, and each group of the support is connected with the connecting part on the corresponding side.

[0017] Further, two groups of the supports are connected with the two connecting parts respectively, and are arranged in an expanded shape in an inclined manner, and one group of the support is arranged horizontally and connected with the connecting part in the notch.

[0018] Further, the connecting parts in the method are arranged in two groups at intervals, and the connecting bolts are arranged on each group of the connecting parts, and the ends of the supports are connected with the corresponding connecting parts.

[0019] The two hooks in the method are arranged at intervals on the steel wire rope.

[0020] The method forms a rotating formwork transportation mechanism through the arrangement of the pulley assembly, controls the forward and reverse operation of the winch, and can realize the rapid reverse transportation of the formwork in the prefabricated small box girder. The method realizes the transportation of the formwork by dragging the steel wire rope through the forward and reverse operation of the winch, changes the traditional process of mainly relying on manpower and mechanical dragging for the transportation of the formwork in the prefabricated small box girder, and has the disadvantages of low construction efficiency, high construction risk coefficient and frequent damage to the internal concrete of the prefabricated box girder. The method reduces the construction difficulty of workers, realizes the rapid transportation of the formwork in the narrow space of the prefabricated small box girder, improves the safety of on-site construction, has high construction efficiency, strong operability, can effectively shorten the construction period, and can realize cyclic use of the device, save construction cost, and the effect completely meets the actual construction needs through on-site actual construction test. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The figure is a schematic diagram of the installation structure of the application.

[0022] Figure 2 The structural schematic diagram of the pulley assembly of the present application.

[0023] Figure 3 The structural schematic diagram of the present application Figure 1 The enlarged structural schematic diagram of the structure at I.

[0024] Figure 4 The structural schematic diagram of the present application Figure 1 The sectional structural schematic diagram of the present application.

[0025] Figure 5 The structural schematic diagram of the present application Figure 4 The structural schematic diagram of the template hoisting to the end of the prefabricated small box girder.

[0026] In the figure, 1 is a hoist, 2 is a prefabricated small box girder, 3 is a steel wire rope, 4 is a pulley assembly, 41 is a connecting bolt, 42 is a fixing piece, 43 is a rubber gasket, 44 is a bracket, 45 is a pulley, 46 is a connecting piece, 5 is a template, and 6 is a hook. DETAILED DESCRIPTION

[0027] The present application will be further described below in combination with the drawings.

[0028] As Figures 1 to 5 shown, the template removal and transportation method in the narrow space of the prefabricated small box girder of the present application comprises the following steps:

[0029] a. The pulley assembly 4 is installed at both ends of the prefabricated small box girder 2, and the steel wire rope 3 of the hoist 1 is wound over the pulley assembly 4 at both ends of the prefabricated small box girder 2 in sequence, and the hook 6 is installed on the steel wire rope 3 inside the prefabricated small box girder 2;

[0030] b. The template 5 is removed and hoisted by the hook 6;

[0031] c. The hoist 1 is started to transport the template 5 to one end of the prefabricated small box girder 2;

[0032] d. The template 5 is unloaded, the hoist 1 is started in reverse, and the hook 6 is re-entered into the prefabricated small box girder 2;

[0033] e, repeat steps c to e to complete the template 5 removal. Those skilled in the art can understand that step a is mainly a preparation stage, and the arrangement of the hoisting member is carried out, the pulley assembly 4 is installed at both ends of the prefabricated small box girder 2, specifically at the upper side wall of the prefabricated small box girder 2 channel, the steel wire rope 3 is turned, and at the same time the steel wire rope 3 of the winch 1 is wound around the pulley assembly 4 at both ends of the prefabricated small box girder 2 in sequence, the steel wire rope 3 is arranged in a loop shape on the outside of the upper end of the prefabricated small box girder 2 and inside the prefabricated small box girder 2 through the pulley assembly 4, and the movement and resetting of the steel wire rope 3 can be realized through the forward and reverse rotation of the winch 1, and in order to facilitate the suspension of the template 5, hooks 6 are preferably arranged on the steel wire rope 3, and the hooks 6 should actually be located inside the prefabricated small box girder 2 and hung with the removed template 5 by workers. Step b is mainly completed by manual work, and the template 5 is directly hung on the hook 6 after being removed by the worker. Step c transports the template 5 to the port of the prefabricated small box girder 2, mainly by starting the winch to drive the steel wire rope 3 to move and thereby realize the movement of the template 5. Step d resets the hook 6 to facilitate the continuous transportation of the template 5, and the hook 6 is sent to the template 5 hoisting position inside the prefabricated small box girder 2 by reversing the winch 1. Step e only needs to repeat steps c to e to complete hoisting, transportation and resetting according to the position of the template 5, until the template 5 is completely removed.

[0034] Preferably, in the above method, the winch 1 in step a is arranged at the upper middle part of the prefabricated small box girder 2. Those skilled in the art can understand that in order to ensure that the winch 1 works stably, the winch 1 is preferably arranged at the upper middle part of the prefabricated small box girder 2.

[0035] Preferably, in the above method, the pulley assembly 4 comprises a fixing member 42, a pulley 45 and a bracket 44, the fixing member 42 is fixed at the upper end of the prefabricated small box girder 2, one end of the bracket 44 is connected with the fixing member 42, and the pulley 45 is rotatably arranged at the end of the bracket 44 away from the fixing member 42, and the steel wire rope 3 is embedded in the groove of the pulley 45. Those skilled in the art can understand that the structure of the pulley assembly 4 in the method is preferably, specifically comprising a fixing member 42, a pulley 45 and a bracket 44, the fixing member 42 is fixed at the upper end of the prefabricated small box girder 2 to realize the connection between the pulley assembly 4 and the prefabricated small box girder 2. The bracket 44 is mainly used to adjust the position of the pulley 45 to avoid the contact between the steel wire rope 3 and the side wall of the prefabricated small box girder 2, which may cause abrasion between the steel wire rope 3 and the side wall of the prefabricated small box girder 2 during use. Therefore, one end of the bracket 44 is connected with the fixing member 42, the pulley 45 is rotatably arranged at the end of the bracket 44 away from the fixing member 42, and the steel wire rope 3 is embedded in the groove of the pulley 45 to realize the turning control of the steel wire rope 3.

[0036] Preferably, the fixing part 42 in the above method is L-shaped structure, and the number is two and is arranged opposite, the inner wall of the fixing part 42 is connected with the side wall of the port of the prefabricated small box girder 2, the outer wall of the fixing part 42 is provided with a connecting piece 46, the connecting bolt 41 is arranged on the connecting piece 46, and the nut is arranged outside the connecting piece 46. One end of the support 44 is connected with the connecting piece 46. Those skilled in the art can understand that the structure of the fixing part 42 is further optimized in the method, in order to facilitate the connection and fixation with the prefabricated small box girder 2, the fixing part 42 is preferably L-shaped structure, and the number is two and is arranged opposite, the inner wall of the fixing part 42 is connected with the side wall of the port of the prefabricated small box girder 2, and the actual fixing part 42 is connected with the upper end surface and the end side wall or the inner upper wall and the end side wall of the prefabricated small box girder 2. At the same time, the connecting piece 46 is arranged on the outer wall of the fixing part 42, the connecting bolt 41 is arranged on the connecting piece 46, and the nut is arranged outside the connecting piece 46. The inner wall of the fixing part 42 is tightly contacted with the side wall of the prefabricated small box girder 2 under the action of the screw thread pretightening force by screwing the nut, so that the fixing of the fixing part 42 is realized, and one end of the support 44 is connected with the connecting piece 46. The steel wire rope 3 can be contacted with the side wall of the prefabricated small box girder 2 after passing through the pulley 45.

[0037] Preferably, the inner wall of the fixing part 42 in the above method is provided with a rubber gasket 43. Those skilled in the art can understand that in order to increase the friction, the inner wall of the fixing part 42 is preferably provided with a rubber gasket 43.

[0038] Preferably, the connecting piece 46 in the above method is U-shaped structure, and the bottom surface is provided with a penetrating hole, and the screw rod of the connecting bolt 41 is arranged in the penetrating hole. Those skilled in the art can understand that since the connecting piece 46 is connected with the connecting bolt 41 and the support 44, in order to ensure the structural strength of the connecting piece 46, the connecting piece 46 is preferably U-shaped structure, and the bottom surface is provided with a penetrating hole, and the screw rod of the connecting bolt 41 is arranged in the penetrating hole.

[0039] Preferably, the support 44 in the above method has three groups, and is connected with the connecting piece 46 on the corresponding side. Those skilled in the art can understand that in order to ensure the supporting and steering effect of the steel wire rope 3, the support 44 in the method preferably has three groups, and is connected with the connecting piece 46 on the corresponding side. The position of the support 44 can be adjusted according to the installation position. In the method, the support 44 is preferably inclined and connected with the upper connecting piece 46, and the other two supports 44 are connected with the lower connecting piece 46. As long as the steel wire rope 3 does not contact with the side wall of the prefabricated small box girder 2 after passing through the pulley 45, the effect can be achieved.

[0040] Preferably, in the above method, two groups of the supports 44 are connected with two connecting members 46 respectively, and are arranged in an expanding shape, one group of the supports 44 is arranged horizontally and is connected with the connecting member 46 in the notch. It can be understood by those skilled in the art that the arrangement of three groups of the supports 44 is further preferred, specifically, two groups of the supports 44 are connected with two connecting members 46 respectively, and are arranged in an expanding shape, one group of the supports 44 is arranged horizontally and is connected with the connecting member 46 in the notch. In this arrangement, the actual steel wire rope 3 is wound outside the pulley 45 at the end of the upper support 44 into the sliding groove, and then is wound outside the pulley 45 at the end of the middle support 44 into the sliding groove, and then is slid out of the sliding groove inside the pulley 45 at the end of the bottom support 44.

[0041] Preferably, in the above method, the connecting member 46 is two groups arranged at intervals, and a connecting bolt 41 is arranged on each connecting member 46, and the end of the support 44 is connected with the corresponding connecting member 46. It can be understood by those skilled in the art that, in order to ensure the structural strength, the connecting member 46 is preferably two groups arranged at intervals, and a connecting bolt 41 is arranged on each connecting member 46, and the end of the support 44 is connected with the corresponding connecting member 46.

[0042] Preferably, in the above method, the hook 6 is two and is arranged at intervals on the steel wire rope 3. It can be understood by those skilled in the art that, in order to ensure the stable suspension of the formwork 5, the hook 6 is preferably two and is arranged at intervals on the steel wire rope 3, which actually makes the formwork 5 bear force on both sides, ensures the stable force bearing of the formwork 5 during transportation, and avoids excessive shaking.

Claims

1. A method for transporting formwork for dismantling narrow spaces in precast small box girder, characterized in that The method comprises the steps of: a. installing pulley assemblies (4) at both ends of a prefabricated small box girder (2), and winding a steel wire rope (3) of a winch (1) over the pulley assemblies (4) at both ends of the prefabricated small box girder (2) in sequence, and a hook (6) is installed on the steel wire rope (3) inside the prefabricated small box girder (2); b. removing a formwork (5) and lifting the formwork (5) through the hook (6); c. starting the winch (1) to transport the formwork (5) to one end of the prefabricated small box girder (2); d. removing the formwork (5) and reversing the winch (1) to re-enter the hook (6) into the prefabricated small box girder (2); e. repeating steps c to e to complete the removal of the formwork (5); The pulley assembly (4) comprises a fixing piece (42), a pulley (45) and a bracket (44), the fixing piece (42) can be fixed at the upper end of the prefabricated small box girder (2), one end of the bracket (44) is connected with the fixing piece (42), the pulley (45) is rotatably arranged at the end of the bracket (44) away from the fixing piece (42), and the steel wire rope (3) is embedded in the groove of the pulley (45).

2. The prefabricated small box girder inner narrow space form removal template transportation method according to claim 1, characterized in that: The winch (1) in step a is arranged in the middle of the upper end of the prefabricated small box girder (2).

3. The precast small box girder inner narrow space form removal template transportation method according to claim 1, characterized in that: The fixing piece (42) is L-shaped and two pieces are arranged opposite to each other, the inner walls of the fixing piece (42) are connected with the side walls of the ports of the prefabricated small box girder (2), the outer wall of the fixing piece (42) is provided with a connecting piece (46), the connecting piece (46) is provided with a connecting bolt (41) penetratingly arranged thereon, a nut is arranged outside the connecting piece (46), and one end of the bracket (44) is connected with the connecting piece (46).

4. The precast small box girder inner narrow space form removal template transportation method according to claim 1, characterized in that: The inner wall of the fixing piece (42) is provided with a rubber gasket (43).

5. The precast small box girder inner narrow space form removal template transportation method according to claim 3, characterized in that: The connecting piece (46) is U-shaped and provided with a penetrating hole in the bottom surface, and the shank of the connecting bolt (41) is penetratingly arranged in the penetrating hole.

6. The precast small box girder inner narrow space form removal template transportation method according to claim 3, characterized in that: The bracket (44) has three groups and is connected with the corresponding connecting pieces (46) respectively.

7. The precast small box girder inner narrow space form removal template transportation method according to claim 6, characterized in that: Two groups of brackets (44) are connected with two connecting pieces (46) respectively and are arranged in an expanded shape, and one group of brackets (44) is arranged horizontally and connected with the connecting piece (46) in the notch.

8. The precast small box girder inner narrow space form removal template transportation method according to claim 3, characterized in that: The connecting pieces (46) are two groups arranged at intervals, and the connecting bolts (41) are penetratingly arranged on each group of connecting pieces (46), and the ends of the brackets (44) are connected with the corresponding connecting pieces (46) respectively.

9. The method of claim 1, wherein: The hooks (6) are two and are arranged at intervals on the steel wire rope (3).

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