Method for erecting precast beams of small-span reservoir dam bridge

Abstract

The invention relates to a small-span reservoir dam bridge precast beam erecting method. The method comprises the following steps that S1, a bridge girder erection machine is assembled and moves forwards to pass through holes; s2, transporting and erecting precast beams of the first three spans; s3, subsequent span precast beams are transported and stacked; s4, the bridge girder erection machine continues to move forwards by two spans, erection of the two spans of precast beams is completed through the precast beams stacked before, and the remaining unerected precast beams are moved to the two spans of precast beams; s5, the step S4 is repeated until the front supporting legs move to the tail of the bridge, and erection of the last two-span precast beams is completed; and S6, the bridge erecting machine moves forwards and is dismantled. The method is high in construction efficiency, good in economical efficiency and high in safety.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy project construction, and particularly relates to a method for erecting precast beams of a small-span reservoir dam bridge. Background Art

[0002] A dam is a water retaining structure that intercepts the flow of rivers and channels to raise the water level or regulate the flow. In addition to setting gates and auxiliary buildings, a bridge connecting the two banks of the dam is usually set on the dam for vehicles and pedestrians to pass. The bridge usually adopts T-shaped beams or other forms of precast concrete beams. The two ends of the precast beam are erected above the pier on the overflow dam, and the span of the precast beam is equal to the width of the gate between the piers. When using a crawler crane to erect the precast beam, it is difficult to achieve due to the limited space of the dam and the insufficient bearing capacity of the precast beam. Therefore, a bridge erecting machine is often used to erect the precast beam. The conventional method of erecting a bridge erecting machine is to assemble the bridge erecting machine at the bridge head and then move it forward to the first span. The beam transporter transports the precast beam to the bridge head. The bridge erecting machine erects the precast beam of the first span. The bridge erecting machine moves forward to the second span. The beam transporter transports the precast beam to the bridge deck of the first span. The bridge erecting machine erects the precast beam of the second span. Repeat the above steps and erect the precast beams span by span until the erection of the last span of the precast beam is completed. The following problems exist in the method of erecting precast beams span by span according to the traditional bridge erecting machine:

[0003] 1. The beam transporter needs to transport the precast beam along the bridge deck of the erected precast beam to the tail of the bridge erecting machine for feeding the beam. The bearing capacity of the precast beam cannot meet the passage of the beam transporter, and it is necessary to reinforce the precast beam or take other temporary measures to allow the beam transporter to pass, which additionally increases the amount of temporary measures and has poor economy;

[0004] 2. The bridge erecting machine needs to move forward many times to erect the precast beam span by span, the process is cumbersome, and the construction period is long; after erecting each span of the bridge, the bridge erecting machine needs to stop working and wait for the erected precast beam to be reinforced or other temporary measures to be taken, which additionally increases a large amount of construction time;

[0005] 3. The beam transporter transporting the beam along the erected bridge deck and adding temporary measures are all high-altitude operations, and the construction risk is high. Summary of the Invention

[0006] The present invention aims to solve the deficiencies of the prior art and provides a method for erecting precast beams of a small-span reservoir dam bridge.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A method for erecting precast beams of a small-span reservoir dam bridge, including the following steps:

[0008] S1. Assemble the bridge erecting machine and move it forward through the hole;

[0009] Construct the main dam body and pier. Assemble the bridge erecting machine with a crawler crane at the bridgehead on the dam crest. The bottom of the bridge erecting machine is successively provided with a front support leg, a middle support leg, and a rear support leg. After the bridge erecting machine is assembled, it is moved forward. Move the front support leg to the pier of the third span, move the middle support leg to the pier of the first span, and the rear support leg is erected at the bridgehead;

[0010] S2. Transport and erect the precast beams of the first three spans;

[0011] The beam transport vehicle transports the precast beam to the space between the rear support leg and the middle support leg, and use the bridge erecting machine to successively erect the precast beams of the first span, the second span, and the third span;

[0012] S3. Transport and stack the precast beams of the subsequent spans;

[0013] Continue to use the beam transport vehicle to transport the precast beams of the subsequent spans that have not been erected to the bridgehead, and use the bridge erecting machine to stack the precast beams of the subsequent spans that have not been erected on the precast beams of the second span and the third span that have been erected;

[0014] S4. The bridge erecting machine continues to move forward two spans, and use the precast beams stacked before to complete the erection of the precast beams of these two spans, and move the remaining precast beams that have not been erected to these two spans of precast beams;

[0015] S5. Repeat S4 until the front support leg moves to the bridge tail to complete the erection of the precast beams of the last two spans;

[0016] S6. The bridge erecting machine moves forward and is dismantled;

[0017] After the rear support leg of the bridge erecting machine moves to the bridge tail, use the crawler crane to dismantle the bridge erecting machine to complete the erection of all precast beams of the dam bridge.

[0018] Particularly, the span of the reservoir dam bridge is ≤20m, and the number of spans is ≤9 spans.

[0019] Particularly, the expanded distance between the front support leg and the middle support leg of the bridge erecting machine and the expanded distance between the middle support leg and the rear support leg are greater than twice the span of the dam bridge, and the lateral clear distance of a pair of front support legs, a pair of middle support legs, and a pair of rear support legs are all greater than the lateral width of the dam bridge deck.

[0020] Particularly, when the precast beams that have not been erected are stacked, a temporary support and a temporary support are provided between the upper and lower adjacent layers of precast beams. The temporary support is arranged on the top of the lower precast beam and is on the same vertical line as the permanent support of the precast beam of the lowest layer that has been erected. The temporary support is arranged on the top of the precast beam and on both sides of the temporary support, and is used to support the wing plate of the upper precast beam.

[0021] The beneficial effects of the present invention are:

[0022] 1. The beam transporter does not need to transport the beam on the precast beam deck that has been erected. The beam transporter only needs to transport the precast beam to the bridgehead for feeding the beam at one time. Therefore, there is no need to additionally increase the amount of temporary measures for beam transportation and feeding, and the economy is good;

[0023] 2. The bridge erecting machine moves forward two spans each time, simplifies the construction process, and shortens the erection period of precast beams by half; moreover, the bridge erecting machine does not need to stop work and wait for the precast beams that have been erected to be reinforced or take other temporary measures. The bridge erecting machine can continue to erect until all precast beams are erected, greatly shortening the construction period;

[0024] 3. During the erection process of the precast beam, there is no other aerial work except for setting up temporary bearings and temporary supports for the stacking of precast beams, and the construction safety is high. Brief Description of the Drawings

[0025] Figure 1 It is a schematic diagram of S1 of the erection method of the present invention;

[0026] Figure 2 It is a schematic diagram of S2 of the erection method of the present invention;

[0027] Figure 3 It is a schematic diagram of S3 of the erection method of the present invention;

[0028] Figure 4 It is a schematic diagram after the bridge erecting machine continues to move forward two spans in S4 of the erection method of the present invention;

[0029] Figure 5 It is a schematic diagram after the un-erected precast beam is moved forward and stacked in S4 of the erection method of the present invention;

[0030] Figure 6 It is a schematic diagram after the front outrigger is moved to the bridge tail in S5 of the erection method of the present invention;

[0031] Figure 7 It is a schematic diagram after the bridge erecting machine completes the erection of the last two spans of precast beams in S5 of the erection method of the present invention;

[0032] Figure 8 It is a schematic diagram of S6 of the erection method of the present invention;

[0033] Figure 9 It is a schematic diagram of the positions of the temporary bearing and the temporary support during the stacking of the precast beam in the erection method of the present invention;

[0034] In the figure: 1 - crawler crane; 2 - brake pier; 3 - bridge erecting machine; 31 - front outrigger; 32 - middle outrigger; 33 - rear outrigger; 4 - beam transporter; 5 - precast beam; 51 - temporary bearing; 52 - temporary support; 53 - permanent bearing;

[0035] The following will be described in detail with reference to the embodiments of the present invention and the accompanying drawings. Detailed implementation mode

[0036] The present invention will be further described below in conjunction with embodiments:

[0037] A method for erecting precast beams of a small-span reservoir dam bridge includes the following steps:

[0038] S1. Assembly and forward movement of the bridge erection machine 3 through the hole, referring to Figure 1 ;

[0039] Build the main dam body and the pier 2. Assemble the bridge erection machine 3 with a crawler crane 1 on the bridge head of the dam top. The bridge erection machine 3 is successively provided with a front support leg 31, a middle support leg 32, and a rear support leg 33 at the bottom. After the bridge erection machine 3 is assembled, it is moved forward. Move the front support leg 31 to the pier 2 of the third span, move the middle support leg 32 to the pier 2 of the first span, and the rear support leg 33 is erected on the bridge head; the bridge erection machine 3 directly moves two spans. Compared with moving span by span, the number of movements and the moving time of the bridge erection machine 3 are reduced, thereby shortening the construction period;

[0040] S2. Transportation and erection of the precast beams 5 of the first three spans, referring to Figure 2 ;

[0041] The beam transport vehicle 4 transports the precast beam 5 to between the rear support leg 33 and the middle support leg 32, and uses the bridge erection machine 3 to successively erect the precast beams 5 of the first span, the second span, and the third span;

[0042] S3. Transportation and stacking of the precast beams 5 of the subsequent spans, referring to Figure 3 ;

[0043] Continue to use the beam transport vehicle 4 to transport the precast beams 5 of the subsequent unerected bridge spans to the bridge head, and use the bridge erection machine 3 to stack the precast beams 5 of the subsequent unerected bridge spans on the precast beams 5 of the second span and the third span that have been erected;

[0044] The beam transport vehicle 4 does not need to transport beams on the bridge deck of the precast beams 5 that have been erected. The beam transport vehicle 4 only needs to transport the precast beams 5 to the bridge head for feeding the beams at one time. Therefore, there is no need to additionally increase the amount of temporary measures for beam transport and feeding, and the economy is good; since it is a small-span reservoir dam bridge, the number of remaining precast beams 5 is not large, and the precast beams 5 that have been erected can bear them;

[0045] S4. The bridge erection machine 3 continues to move forward two spans, and uses the precast beams 5 stacked before to complete the erection of the precast beams 5 of these two spans, and moves the remaining unerected precast beams 5 to the precast beams 5 of these two spans, referring to Figure 4 , Figure 5 ;

[0046] S5. Repeat S4 until the front support leg 31 moves to the bridge tail to complete the erection of the precast beams 5 of the last two spans, referring to Figure 6 , Figure 7; Since the number of precast beams 5 is relatively small and two spans are moved each time, rapid continuous construction can be achieved, reducing the construction interruption time and improving the overall construction efficiency; rapid continuous construction reduces the waiting time of construction personnel, improves the personnel utilization rate, and reduces the labor cost.

[0047] S6. The bridge erecting machine 3 is moved forward and removed, referring to Figure 8 ;

[0048] After the rear leg 33 of the bridge erecting machine 3 is moved to the bridge end, the bridge erecting machine 3 is removed by using the crawler crane 2, and the erection of all the precast beams 5 of the dam bridge is completed.

[0049] The span of the reservoir dam bridge is ≤ 20 m and the number of spans is ≤ 9 spans.

[0050] The expansion distance between the front leg 31 and the middle leg 32 of the bridge erecting machine 3 and the expansion distance between the middle leg 32 and the rear leg 33 are greater than twice the span of the dam bridge, and the lateral clear distance of a pair of front legs 31, a pair of middle legs 32, and a pair of rear legs 33 are all greater than the lateral width of the dam bridge deck.

[0051] Referring to Figure 9 , when the unerected precast beams 5 are stacked, a temporary support 51 and a temporary brace 52 are provided between the upper and lower adjacent layers of precast beams 5. The temporary support 51 is arranged on the top of the lower precast beam 5 and is located on the same vertical line as the permanent support 53 of the lowermost erected precast beam 5. The temporary brace 52 is arranged on the top of the precast beam 5 and on both sides of the temporary support 51, and is used to support the wing plate of the upper precast beam 5. During the erection process of the precast beam 5, there is no other high-altitude operation except for the temporary support 51 and the temporary brace 52 for stacking the precast beam 5, and the construction safety is high.

[0052] Embodiment 1

[0053] The span of the reservoir dam bridge is ≤ 20 m and the number of spans = 7 spans.

[0054] A method for erecting precast beams of a small-span reservoir dam bridge includes the following steps:

[0055] S1. Assembling and moving the bridge erecting machine 3 forward through the hole, referring to Figure 1 ;

[0056] Build the dam main body and the pier 2. After the construction of the dam main body structure is completed, assemble the bridge erecting machine 3 with the crawler crane 1 at the bridgehead on the dam top. The bridge erecting machine 3 is successively provided with a front leg 31, a middle leg 32, and a rear leg 33 at the bottom. After the bridge erecting machine 3 is assembled, move it forward, move the front leg 31 to the pier 2 of the third span, move the middle leg 32 to the pier 2 of the first span, and the rear leg 33 is erected at the bridgehead;

[0057] S2. Transporting and erecting the precast beams 5 of the first three spans, referring to Figure 2 ;

[0058] The beam transporter 4 transports the precast beam 5 to the position between the rear support leg 33 and the middle support leg 32 at the tail of the bridge erecting machine 3 at the bridge head, and uses the bridge erecting machine 3 to erect the precast beam 5 for the first span, the second span, and the third span in sequence;

[0059] S3. For the transportation and stacking of the precast beams 5 of the subsequent spans, refer to Figure 3 ;

[0060] Continue to use the beam transporter 4 to transport the precast beams 5 of the subsequent unerected bridge spans to the bridge head, and use the bridge erecting machine 3 to stack the precast beams 5 of the subsequent unerected bridge spans on the precast beams 5 of the second span and the third span that have been erected;

[0061] S4. The bridge erecting machine 3 moves forward two more spans, moves the front support leg 31 of the bridge erecting machine 3 to the pier 2 of the fifth span, moves the middle support leg 32 to the pier 2 of the third span, and moves the rear support leg 31 to the pier 2 of the first span; use the bridge erecting machine 3 to erect the precast beams 5 stacked on the second span and the third span to the fourth span and the fifth span, and at the same time stack the remaining unerected precast beams 5 on the precast beams 5 of the fourth span and the fifth span that have been erected, refer to Figure 4 , Figure 5 ;

[0062] S5. Repeat S4, the bridge erecting machine 3 moves forward two more spans, moves the front support leg 31 of the bridge erecting machine 3 to the bridge tail, moves the middle support leg 32 to the pier 2 of the fifth span, and moves the rear support leg 33 to the pier 2 of the third span, and use the bridge erecting machine 3 to erect the precast beams 5 stacked on the fourth span and the fifth span to the sixth span and the seventh span, refer to Figure 6 , Figure 7 ;

[0063] S6. The bridge erecting machine 3 moves forward and is dismantled, refer to Figure 8 ;

[0064] After the rear support leg 33 of the bridge erecting machine 3 is moved to the bridge tail, use the crawler crane 2 to dismantle the bridge erecting machine 3 to complete the erection of all the precast beams 5 of the dam bridge.

[0065] In the present invention, the beam transporter 4 does not need to transport the beam on the deck of the precast beam 5 that has been erected. The beam transporter 4 only needs to transport the precast beam 5 to the bridge head for feeding the beam once, so there is no need to additionally increase the amount of temporary measures for beam transportation and feeding, and the economy is good; the bridge erecting machine 3 moves forward two spans each time, simplifies the construction process, and shortens the erection period of the precast beam 5 by half; and the bridge erecting machine 3 does not need to stop work and wait for strengthening the precast beam 5 that has been erected or taking other temporary measures. The bridge erecting machine 3 can continue to erect until all the precast beams 5 are erected, greatly shortening the construction period; during the erection process of the precast beam 5, there is no other high-altitude operation except for setting the temporary support 51 and the temporary bracing 52 for stacking the precast beam 5, and the construction safety is high.

[0066] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0067] In addition, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for erecting precast beams of a small-span reservoir dam bridge, characterized in that, It includes the following steps: S1. Assemble the bridge erecting machine (3) and move it forward to cross the pier; Construct the main body of the dam and the pier (2). Assemble the bridge erecting machine (3) with a crawler crane (1) at the bridgehead on the dam top. The bridge erecting machine (3) is successively provided with a front support leg (31), a middle support leg (32), and a rear support leg (33) at the bottom. After the bridge erecting machine (3) is assembled, move it forward. Move the front support leg (31) to the third-span pier (2), move the middle support leg (32) to the first-span pier (2), and the rear support leg (33) is erected at the bridgehead; S2. Transport and erect the precast beams (5) of the first three spans; The beam transport vehicle (4) transports the precast beam (5) between the rear support leg (33) and the middle support leg (32), and uses the bridge erecting machine (3) to successively erect the precast beams (5) of the first span, the second span, and the third span; S3. Transport and stack the precast beams (5) of the subsequent spans; Continue to use the beam transport vehicle (4) to transport the precast beams (5) of the subsequent un-erected bridge spans to the bridgehead, and use the bridge erecting machine (3) to stack the precast beams (5) of the subsequent un-erected bridge spans on the precast beams (5) of the second span and the third span that have been erected; S4. The bridge erecting machine (3) continues to move forward two spans, and uses the precast beams (5) stacked before to complete the erection of the precast beams (5) of these two spans, and move the remaining un-erected precast beams (5) to these two spans of precast beams (5); S5. Repeat S4 until the front support leg (31) moves to the bridge tail and complete the erection of the precast beams (5) of the last two spans; S6. Move the bridge erecting machine (3) forward and disassemble it; After the rear support leg (33) of the bridge erecting machine (3) moves to the bridge tail, use the crawler crane (2) to disassemble the bridge erecting machine (3) to complete the erection of all the precast beams (5) of the dam bridge.

2. The erection method of precast beams for a small-span reservoir dam bridge according to claim 1, characterized in that, The span of the reservoir dam bridge is ≤ 20m, and the number of spans is ≤ 9 spans.

3. The precast beam erection method for a small-span reservoir dam bridge according to claim 1, characterized in that, The expanded distance between the front support leg (31) and the middle support leg (32) of the bridge erecting machine (3) and the expanded distance between the middle support leg (32) and the rear support leg (33) are greater than twice the span of the dam bridge. The lateral clear distance between a pair of front support legs (31), a pair of middle support legs (32), and a pair of rear support legs (33) is greater than the lateral width of the dam bridge deck.

4. A method for erecting precast beams of a small-span reservoir dam bridge according to claim 1, characterized in that, When stacking the un-erected precast beams (5), a temporary bearing (51) and a temporary support (52) are provided between the upper and lower adjacent layers of precast beams (5). The temporary bearing (51) is arranged on the top of the lower precast beam (5) and is located on the same vertical line as the permanent bearing (53) of the lowermost precast beam (5) that has been erected. The temporary support (52) is arranged on the top of the precast beam (5) and on both sides of the temporary bearing (51) for supporting the wing plate of the upper precast beam (5).

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