Reinforced concrete prefabricated cover plate and construction method thereof

Abstract

The application discloses a construction method of a reinforced concrete prefabricated cover plate and relates to the field of bridge pier construction. The method comprises the following steps: manufacturing a concrete prefabricated plate; hoisting the concrete prefabricated plate to the top of a bridge pier for arrangement; placing a second type of steel at a manhole; and pouring concrete on the top of the bridge pier. The concrete prefabricated plate with the first type of steel inserted into two ends is arranged on the top of the bridge pier. The first type of steel at the two ends of the concrete prefabricated plate is in abutment with the bridge body on the top of the bridge pier. The concrete prefabricated plate is not in contact with the bridge body of the bridge pier. The concrete prefabricated plate is immersed in the hollow part of the bridge pier. The height of the top of the concrete prefabricated plate is not higher than the height of the bridge pier. The manhole is arranged on the top of the bridge pier. The second type of steel is placed at the manhole instead of the concrete prefabricated plate. Finally, the concrete is poured on the top of the bridge pier to complete the capping work of the bridge pier, so that the construction risk is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge pier construction, in particular to a reinforced concrete prefabricated cover plate and a construction method thereof. BACKGROUND

[0002] A bridge pier is a middle support structure of a bridge except for a bridge abutment which connects with a road embankment at both ends in a bridge with two holes and more than two holes. The function of the bridge pier is to support a bridge span structure, and the bridge abutment has the function of connecting with the road embankment and preventing the road embankment from sliding.

[0003] The reinforced concrete prefabricated cover plate is widely used in different places such as municipal roads, garden facilities, residential areas, schools and sports stadiums. In bridge construction, the reinforced concrete prefabricated cover plate is mainly used for covering the top of the bridge pier, and then the top of the bridge pier is poured to realize the sealing work of the top of the bridge pier.

[0004] At present, in order to save the construction cost of the bridge, the pier body is designed as a hollow structure in the bridge construction, which can reduce the material cost and effectively reduce the self-weight and the pressure on the ground, thereby reducing the construction cost of the foundation. However, when pouring the top of the bridge pier, the formwork needs to be erected because the pier body is a hollow structure, otherwise the concrete will directly fall into the interior of the pier body. In order to support the formwork, a bracket is generally erected on the pier body to support, and then the pouring of the concrete of the top of the bridge pier is carried out. This construction method involves a lot of high-altitude work, and the construction personnel need to be suspended in the air and manually install the bracket on the pier body, so the construction risk is large. SUMMARY

[0005] In view of the defects in the prior art, the technical problem solved by the present application is how to reduce the construction risk.

[0006] To achieve the above purpose, the construction method of the reinforced concrete prefabricated cover plate provided by the present application comprises the following steps:

[0007] The concrete prefabricated plate is made, the concrete prefabricated plate is hoisted to the top of the bridge pier, and the concrete prefabricated plate is arranged in sequence along the pier body. In the arrangement process, the position of the concrete prefabricated plate is at the manhole-free position of the top of the bridge pier, the first type steel frame at both ends of the concrete prefabricated plate is arranged on the pier body at the top of the bridge pier, and the second type steel is arranged at the manhole of the top of the bridge pier.

[0008] On the basis of the above technical scheme, before the second type steel is arranged at the manhole of the top of the bridge pier, the following steps are specifically included: the second type steel is cut, and the cut part is connected through a fixing structure.

[0009] On the basis of the above technical scheme, after the second type steel is placed at the manhole at the top of the bridge pier, the following steps are specifically included: concrete pouring work is carried out on the top of the bridge pier, after the concrete solidifies, the concrete at the manhole is excavated, and a section of the second type steel located at the top of the manhole is removed.

[0010] On the basis of the above technical scheme, after the section of the second type steel located at the top of the manhole is removed, the following steps are specifically included: the second type steel has a section located in the hollow inside the bridge pier, one end of the section of the second type steel is bound by the hoisting device, the end is connected with the manhole, the fixing structure of the other end of the second type steel is disassembled, the section of the second type steel is in a vertical state, and then the hoisting device can be used to hoist the section of the second type steel out of the manhole.

[0011] On the basis of the above technical scheme, before the concrete prefabricated plate is hoisted to the top of the bridge pier, the following steps are specifically included: the lifting lugs are welded on the concrete prefabricated plate.

[0012] On the basis of the above technical scheme, the reinforced concrete prefabricated cover plate comprises a plurality of concrete prefabricated plates and a bridge pier, the concrete prefabricated plates are in a strip shape, and a plurality of first type steels are inserted into both ends of each concrete prefabricated plate.

[0013] On the basis of the above technical scheme, the first type steel is provided with a lifting pad at the bottom, and the lifting pad is used to increase the height of the concrete prefabricated plate.

[0014] On the basis of the above technical scheme, the concrete prefabricated plate is arranged at the position without the manhole at the top of the bridge pier, and the second type steel is arranged at the position with the manhole at the top of the bridge pier.

[0015] On the basis of the above technical scheme, the second type steel comprises four third type steels, a connecting plate is arranged at each cutting position of the second type steel, bolt holes are formed in each connecting plate, and the adjacent third type steels are fixed through the connecting plate and a bolt assembly.

[0016] On the basis of the above technical scheme, the concrete prefabricated plate is made of C35 concrete, the longitudinal reinforcement in the concrete prefabricated plate is made of φ28, the stirrup is made of φ12, the first type steel is made of G10, and the second type steel is made of G28b.

[0017] Compared with the prior art, the present application has the following advantages:

[0018] 1. The first type steel at both ends of the concrete prefabricated plate is abutted with the bridge body at the top of the bridge pier, the concrete prefabricated plate itself does not contact the bridge body of the bridge pier, so the concrete prefabricated plate is immersed in the hollow inside the bridge pier; the reason for designing this structure is that after the bridge pier is completed and capped, other building structures need to be installed at the top of the bridge pier, in order not to change the overall height of the bridge pier and avoid adverse effects on subsequent construction, so the top height of the concrete prefabricated plate cannot be higher than the height of the bridge pier.

[0019] Therefore, the concrete prefabricated plate 1 can play the role of a bottom mold, and the capping work of the bridge can be completed without additional support erection, compared with the existing construction method, the concrete pouring work is completed by placing the completed concrete prefabricated plate on the top of the pier through the tower crane, without additional support erection and bottom mold by manpower, reducing the high-altitude operation of the construction personnel, and ensuring the construction safety.

[0020] 2. A manhole will be provided at the top of the pier, and the second type steel will be placed at the manhole instead of the concrete prefabricated plate, because after the concrete pouring work is completed, in order to open the manhole, the concrete and the support inside the manhole need to be removed. Compared with the removal of the concrete prefabricated plate, the former has lower construction difficulty and can shorten the construction period; and compared with the prior art, this construction method does not need additional support erection and bottom mold, so the support does not need to be removed in the later period, thereby shortening the construction period and improving the construction efficiency. In summary, this construction method can shorten the construction period and improve the construction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The flowchart of the construction method of the reinforced concrete prefabricated cover plate in the embodiment of the application;

[0022] Figure 2 The left view of the reinforced concrete prefabricated cover plate in the embodiment of the application;

[0023] Figure 3 The top view of the reinforced concrete prefabricated cover plate in the embodiment of the application;

[0024] Figure 4 The front view of the reinforced concrete prefabricated cover plate in the embodiment of the application;

[0025] Figure 5 The sectional view of the second type steel cutting position of the reinforced concrete prefabricated cover plate in the embodiment of the application.

[0026] In the figure: 1-concrete prefabricated plate, 2-first type steel, 3-cushion, 4-pier, 5-second type steel, 6-manhole, 7-connection plate, 8-bolt hole. DETAILED DESCRIPTION

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

[0028] Referring to Figure 1 the construction method of the reinforced concrete prefabricated cover plate in the embodiment of the application, the following steps are included:

[0029] S1: inserting a plurality of first type steels 2 into both ends of each concrete prefabricated plate 1;

[0030] S2: hoist the finished concrete prefabricated slab 1 to the top of the pier 4 by the tower crane, and arrange the concrete prefabricated slab 1 along the bridge body; during the arrangement, the concrete prefabricated slab 1 is positioned at the top of the pier 4 without the manhole, and the first type steel 2 at both ends of the concrete prefabricated slab 1 is erected on the bridge body at the top of the pier 4;

[0031] S3: place the second type steel 5 at the manhole at the top of the pier 4;

[0032] S4: perform concrete pouring at the top of the pier 4.

[0033] Therefore, the first type steel 2 at both ends of the concrete prefabricated slab 1 is abutted against the bridge body at the top of the pier 4, and the concrete prefabricated slab 1 itself does not contact the bridge body of the pier 4, so that the concrete prefabricated slab 1 is sunk into the internal hollow of the pier 4; the reason for designing this structure is that after the capping work of the pier 4 is completed, other building structures need to be additionally installed at the top of the pier 4, in order not to change the overall height of the pier 4 and avoid adversely affecting the subsequent construction, so that the top height of the concrete prefabricated slab 1 cannot be higher than the height of the pier 4.

[0034] Therefore, the concrete prefabricated slab 1 can play the role of a bottom form, and the capping work of the bridge can be completed without additionally erecting a support, compared with the existing construction method, which only needs to place the finished concrete prefabricated slab 1 at the top of the pier 4 by the tower crane, without the need for additional erection of a support and a bottom form to complete the concrete pouring work, thereby reducing the high-altitude operation of the construction personnel and ensuring the construction safety.

[0035] The manhole is provided at the top of the pier 4, and the second type steel 5 is placed at the manhole instead of the concrete prefabricated slab 1, because after the concrete pouring work is completed, in order to open the manhole 6, the concrete and the support in the manhole 6 need to be removed. The removal of the second type steel 5 is easier than the removal of the concrete prefabricated slab 1, so that the construction period can be shortened; and compared with the prior art, the construction method does not need to additionally erect a support and a bottom form, so that the support does not need to be removed in the later period, thereby shortening the construction period. In summary, the construction method can shorten the construction period and improve the construction efficiency.

[0036] Preferably, before the finished concrete prefabricated slab 1 is hoisted to the top of the pier 4 by the tower crane in S2, the following step is specifically included: welding and installing lifting lugs on the concrete prefabricated slab 1.

[0037] The benefit of the design is that the concrete prefabricated slab 1 is heavy and long, and direct lifting may cause the concrete prefabricated slab 1 to tilt and fall, which may cause certain safety hazards, therefore, the lifting lug is installed on the concrete prefabricated slab 1, and the lifting work is more stable through the lifting lug, and the steel bars of the lifting lug are welded with the steel bars of the concrete prefabricated slab 1, which further strengthens the firmness between the lifting lug and the concrete prefabricated slab 1, thereby improving the safety of construction.

[0038] Preferably, referring to Figure 1 Before S3, the second steel 5 is processed on the ground, and the second steel 5 is cut into four sections, and each section of the second steel 5 is connected through the connecting plate 7 and the bolt assembly.

[0039] The benefit of the design is that after the top concrete pouring work of the bridge pier 4 is completed, the manhole 6 is sealed by the concrete and the second steel 5, and in order to maintain the bridge pier 4 in the future, the manhole 6 must be in an open state, therefore, the concrete poured at the top of the manhole 6 and the second steel 5 are removed, and in order to facilitate the removal of the second steel 5, the second steel 5 is cut in advance, and the connecting plate 7 and the bolt assembly are used to connect each section of the second steel 5, and only the bolt assembly needs to be removed, and the second steel 5 is separated, and the cutting work of the second steel 5 in the air is not needed, which reduces the construction difficulty and improves the construction efficiency.

[0040] Preferably, referring to Figure 1 After S4, the concrete at the manhole is dug out, the bolt assembly of the second steel 5 at the top of the manhole 6 is disassembled, and the second steel 5 at the top of the manhole is removed.

[0041] The benefit of the design is that in order to facilitate the maintenance of the bridge pier 4 in the future, the manhole 6 cannot be blocked, and when the concrete pouring work is performed at the top of the bridge pier 4, the entire top surface of the bridge pier 4 is poured, therefore, after the concrete pouring work is completed and the concrete is solidified, the concrete and the second steel 5 at the manhole need to be removed, so that the manhole 6 is in an open state, thereby facilitating the maintenance of the bridge pier 4 in the future.

[0042] Preferably, referring to Figure 1As shown, after the second type steel 5 located at the top of the manhole is taken out, the method specifically comprises the following steps: the second type steel 5 has a section located in the hollow of the pier 4, and one end of the second type steel 5 is connected with the manhole 6, the end of the second type steel 5 connected with the manhole 6 is bound by the tower crane, the construction personnel are from the manhole 6, the inner inspection platform is arranged in the pier 4, the construction personnel walk to the other end of the section of the second type steel 5 along the inner inspection platform, the bolt assembly fixed on the section of the second type steel 5 is disassembled, the section of the second type steel 5 is in a vertical state, and then the section of the second type steel 5 can be hoisted out of the manhole 6 by the tower crane.

[0043] The second type steel 5 is finally in a vertical state through the above method, the end of the second type steel 5 is hoisted by the tower crane, the hoisting rope of the tower crane extends into the pier from the manhole 6, the second type steel 5 is located directly below the manhole 6, the second type steel 5 can be recycled through the tower crane, the second type steel 5 can be reused, the material cost is reduced, and certain economic benefits are obtained.

[0044] The reinforced concrete prefabricated slab 1 cover plate in the embodiment of the application, as shown in Figure 2 and Figure 3 comprises a plurality of concrete prefabricated slabs 1, the concrete prefabricated slab 1 is in a strip shape, and a plurality of first type steels 2 are inserted into both ends of each concrete prefabricated slab 1.

[0045] The height of the top of the concrete prefabricated slab 1 cannot be higher than the height of the pier 4 because of construction requirements, the first type steels 2 are inserted into both ends of the concrete prefabricated slab 1, the placement groove is excavated in advance at the top of the pier 4, the first type steels 2 are placed in the placement groove, the first type steels 2 abut against the placement groove, the falling of the concrete prefabricated slab 1 is avoided, and the height of the top of the concrete prefabricated slab 1 will not be higher than the height of the pier 4.

[0046] Preferably, an ear is arranged on the concrete prefabricated slab 1, and the steel bars of the ear are weldedly connected with the steel bars of the concrete prefabricated slab 1.

[0047] The concrete prefabricated slab 1 has a large weight, and the falling accident in the hoisting process is avoided, and the construction safety is ensured, so the ear is arranged on the concrete prefabricated slab 1, and the steel bars of the ear are weldedly connected with the steel bars of the concrete prefabricated slab 1, so that the firmness between the ear and the concrete prefabricated slab 1 is further strengthened.

[0048] Preferably, as shown in Figure 2As shown in the drawings, the first steel 2 is provided with a lifting pad 3 at the bottom, which is used to increase the height of the concrete precast slab 1.

[0049] The benefit of such design is that there will be some errors in the construction process. In order to make the top of the concrete precast slab 1 not higher than the height of the pier 4, the placing groove will be excavated to a certain depth. Therefore, in order to make the concrete precast slab 1 placed parallel to the horizontal line, the lifting pad 3 is provided at the bottom of the first steel 2 to lift one end of the concrete precast slab 1, so that the concrete precast slab 1 is parallel to the horizontal line.

[0050] Preferably, the length of the first steel 2 inserted into the concrete precast slab 1 is not less than 350mm, and the spacing between adjacent first steels 2 can be selected as 200mm.

[0051] The benefit of such design is that in order to avoid the first steel 2 from falling off from the inside of the concrete precast slab 1 during the supporting process, the length of the first steel 2 inserted into the concrete precast slab 1 is not less than 350mm, so that the firmness between the first steel 2 and the concrete precast slab 1 is improved, thereby improving the safety of construction; because the construction of the pier 4 is completed after the top is capped, there are other construction processes at the top of the pier 4, so the steel reinforcement is installed in advance along the bridge body vertically upward. In order to avoid collision between the first steel 2 and the extended steel reinforcement, a certain spacing is required between adjacent first steels 2, and the spacing can be selected as 200mm by measurement.

[0052] Preferably, referring to Figure 3 and Figure 4 As shown in the drawings, the concrete precast slab 1 is provided at the top of the pier 4 without manhole, and the second steel 5 is provided at the top of the pier 4 with manhole.

[0053] The benefit of such design is that because the manhole 6 needs to be left after capping the top of the pier 4 for the later maintenance of the pier 4, and because the top of the pier 4 is poured with concrete as a whole, it is impossible to leave a manhole alone, therefore, in order to facilitate the opening of the manhole 6 after the concrete pouring construction, the second steel 5 is placed at the manhole of the top of the pier 4, and the reason is that the second steel 5 is convenient to take out after the pouring construction.

[0054] Preferably, the second steel 5 includes four third steels, referring to Figure 5 As shown in the drawings, the second steel 5 is provided with a connecting plate 7 at each cutting position, and a bolt hole 8 is formed on each connecting plate 7, and the adjacent third steels are fixed by the connecting plate 7 and the bolt assembly.

[0055] The second type steel 5 is cut before being placed, and is fixed through the connecting plate 7 and the bolt assembly, and when the second type steel 5 needs to be taken out, the bolt assembly is only needed to be disassembled, and each section of the second type steel 5 can be separated, so that the construction safety is improved, and the construction efficiency is improved.

[0056] Preferably, the concrete prefabricated slab 1 is selected from C35 concrete (the type of concrete), the longitudinal reinforcement in the concrete prefabricated slab 1 is selected from φ28 (the type of reinforcement), the stirrup is selected from φ12, the reinforcement of the lifting lug is selected from φ20, the first type steel 2 is selected from G10 (the type of steel), and the second type steel 5 is selected from G28b.

[0057] The bridge pier 4 has a large structure weight, and in order to ensure the construction safety of the bridge pier 4 and the service life in the later period, the strength of the material itself needs to be strengthened, so that the overall structure can be more stressed and firm, and therefore the above construction materials can be selected.

[0058] The present application is not limited to the above-mentioned embodiments, and for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements are also considered to be within the protection scope of the present application. The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A construction method of a reinforced concrete precast cover slab, characterized by, The reinforced concrete prefabricated cover plate comprises a plurality of concrete prefabricated plates (1), wherein each concrete prefabricated plate (1) is in a strip shape, and a plurality of first steel bars (2) are inserted into both ends of each concrete prefabricated plate (1), and the method comprises the following steps: The concrete prefabricated plate (1) is manufactured, a plurality of first steel bars (2) are inserted into each concrete prefabricated plate (1), the concrete prefabricated plate (1) is hoisted to the top of the pier (4), and the concrete prefabricated plate (1) is arranged in sequence along the bridge body; during the arrangement, the concrete prefabricated plate (1) is located at the top of the pier (4) without a manhole, and the first steel bars (2) at both ends of the concrete prefabricated plate (1) are arranged on the bridge body at the top of the pier (4); the second steel bar (5) is arranged at the manhole at the top of the pier (4); Before the second steel bar (5) is arranged at the manhole at the top of the pier (4), the second steel bar (5) is cut into four sections, and the cutting portions are connected through the connecting plates (7) and the bolt assemblies; After the second steel bar (5) is arranged at the manhole at the top of the pier (4), the following steps are included: the concrete at the top of the pier (4) is poured, after the concrete is solidified, the concrete at the manhole is excavated, and the section of the second steel bar (5) at the top of the manhole is removed; After the section of the second steel bar (5) at the top of the manhole is removed, the following steps are included: the second steel bar (5) has a section located in the hollow of the pier (4), one end of the section of the second steel bar (5) is bound by the hoisting equipment, the end is connected with the manhole (6), the bolt assembly at the other end of the second steel bar (5) is disassembled, the section of the second steel bar (5) is in a vertical state, and the section of the second steel bar (5) is hoisted out of the manhole (6) by the hoisting equipment.

2. The construction method of a precast reinforced concrete cover slab as claimed in claim 1, wherein, Before the concrete prefabricated plate (1) is hoisted to the top of the pier (4), the following steps are included: the lifting lugs are welded on the concrete prefabricated plate (1).

3. The construction method of a precast reinforced concrete cover slab as claimed in claim 1, characterized in that: The first steel bar (2) is provided with a lifting pad (3) at the bottom, and the lifting pad (3) is used to increase the height of the concrete prefabricated plate (1).

4. The construction method of a precast reinforced concrete cover slab as claimed in claim 1, wherein: The second steel bar (5) comprises four third steel bars, the connecting plates (7) are arranged at each cutting portion of the second steel bar (5), the bolt holes (8) are formed in each connecting plate (7), and the third steel bars adjacent to each other are fixed through the connecting plates (7) and the bolt assemblies.

5. The construction method of a precast reinforced concrete cover slab as claimed in claim 1, wherein: The concrete prefabricated plate (1) is made of C35 concrete, the longitudinal reinforcement in the concrete prefabricated plate (1) is made of φ28, the stirrup is made of φ12, the first steel bar (2) is made of G10, and the second steel bar (5) is made of G28b.

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