Construction method and structure of prefabricated cover plate at hollow pier manhole

Abstract

The application relates to a construction method and structure of a prefabricated cover plate at a manhole of a hollow pier, which comprises the following steps: setting a bracket and a support on opposite sides of the hollow pier respectively; hoisting the prefabricated cover plate so that both ends of the prefabricated cover plate are arranged on the bracket and the support respectively; pouring concrete in the hollow pier to form a solid section at the top of the pier and a manhole, wherein the manhole is located above the support, and the support is removed after the pouring is completed. By installing the support near the manhole of the pier body, pouring the bracket far from the manhole, arranging both ends of the prefabricated cover plate on the bracket and the support respectively, and removing the support after the concrete pouring at the top of the pier is completed, the manhole is reserved, the method is safe and economical, the installation and removal of the support are convenient, the structure is light, the removed support can be repeatedly used, the construction efficiency is improved, the construction period is shortened, and the method is economical and practical.

Description

Technical Field

[0001] The present invention relates to the field of bridge pier construction, and in particular to a construction method and structure of a prefabricated cover plate at a manhole of a hollow pier. Background Art

[0002] Hollow bridge piers refer to piers made of concrete or reinforced concrete with hollow, thin-walled structures. Compared with gravity-supported solid piers, this saves masonry materials and reduces weight, ensuring both the safety of the bridge and the economic and social benefits of construction. When pouring the top of a hollow pier, to prevent concrete from falling into the pier body, a precast reinforced concrete cover plate is installed on the top of the pier, supported by the pier body corbels. Precast reinforced concrete cover plates are mainly used to seal the top of the pier during bridge construction. After the sealing is completed, the pier top concrete can be poured. The advantages of precast reinforced concrete cover plates are convenient construction and high efficiency.

[0003] In recent years, with the rapid development of transportation both domestically and internationally, the substantial increase in transport volume, the increasing vehicle loads, and the long-term effects of both the natural environment (such as atmospheric corrosion, temperature and humidity fluctuations) and operational conditions (such as increased load frequency and material and structural fatigue), many bridges have gradually failed to meet the requirements of modern transportation, posing a direct threat to the safety of people's lives and property. Consequently, research into the maintenance, reinforcement, and repair of bridge structures has garnered widespread attention. Compared to the superstructure, the substructure of a bridge is more susceptible to damage. Manholes are crucial for pier inspection. Maintenance personnel access the piers through manholes and ladders, using the built-in inspection platforms to perform maintenance. The construction of hollow piers requires both the provision of a manhole and the installation of a cover plate, making construction even more challenging. Summary of the Invention

[0004] The embodiment of the present invention provides a construction method and structure for a prefabricated cover plate at a manhole of a hollow pier, so as to solve the problem in the related art of how to complete the construction of a prefabricated reinforced concrete cover plate at the manhole and reduce the construction difficulty.

[0005] In a first aspect, a construction method for a prefabricated cover plate at a manhole in a hollow pier is provided, which comprises: arranging a corbel and a bracket on opposite sides of the hollow pier; hoisting the prefabricated cover plate so that its two ends are respectively placed on the corbel and the bracket; pouring concrete in the hollow pier to form a solid section of the pier top and a manhole, and the manhole is located above the bracket, and the bracket is removed after the pouring is completed.

[0006] In some embodiments, the prefabricated cover plate is provided with hanging bars; after the prefabricated cover plate is hoisted, the method further includes: connecting the hanging bars to the steel bars of the solid section of the pier top.

[0007] In some embodiments, the step of providing a corbel and a bracket on opposite sides of the hollow pier includes: pre-embedding a climbing cone in the hollow pier, and connecting and fixing the climbing cone to the bracket with bolts.

[0008] In some embodiments, a distribution beam is fixed above the bracket, and the distribution beam is supported below the prefabricated cover plate; the removal of the bracket includes: loosening bolts, lowering the bracket and the distribution beam as a whole, and lifting the distribution beam and the bracket out of the manhole.

[0009] In some embodiments, the prefabricated cover plate is welded with lifting lugs, and the prefabricated cover plate is hoisted using the lifting lugs.

[0010] On the second aspect, a construction structure of a prefabricated cover plate at the manhole of a hollow pier is provided, which includes: a corbel and a bracket arranged on opposite sides of the hollow pier, and the bracket is located below the manhole; a prefabricated cover plate, whose two ends are respectively placed on the corbel and the bracket, and the top of the prefabricated cover plate is used for casting the solid section of the pier top.

[0011] In some embodiments, the prefabricated cover plate is provided with hangers, which are used to connect with the steel bars of the solid section of the pier top.

[0012] In some embodiments, lifting lugs for lifting are welded on the prefabricated cover plate.

[0013] In some embodiments, the length of the bracket is greater than the width of the manhole.

[0014] In some embodiments, a distribution beam is fixed above the bracket, and the distribution beam is supported below the prefabricated cover plate.

[0015] The beneficial effects brought about by the technical solution provided by the present invention include:

[0016] The embodiment of the present invention provides a construction method and structure for a prefabricated cover plate at a manhole of a hollow pier. The method comprises installing a bracket near the manhole of the pier body, casting a corbel at a position far from the manhole, and then placing the two ends of the prefabricated cover plate on the corbel and the bracket respectively. After the concrete pouring of the pier top is completed, the bracket can be removed, which not only completes the reservation of the manhole but also is safe and economical. The bracket is easy to install and disassemble, has a light structure, and can be reused repeatedly after being disassembled, thereby improving construction efficiency, shortening the construction period, and being economical and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A flow chart of a method for constructing a prefabricated cover plate at a manhole in a hollow pier provided by an embodiment of the present invention;

[0019] Figure 2 A left side view of the prefabricated cover plate construction structure for the manhole of a hollow pier provided by an embodiment of the present invention;

[0020] Figure 3 A top view of the prefabricated cover plate construction structure at the manhole of a hollow pier provided by an embodiment of the present invention;

[0021] Figure 4 A front view of a prefabricated cover plate construction structure for a hollow pier manhole provided by an embodiment of the present invention;

[0022] Figure 5 A top view of a prefabricated cover plate provided in an embodiment of the present invention;

[0023] Figure 6 This is a left view of the prefabricated cover plate provided in an embodiment of the present invention.

[0024] Numbers in the figure:

[0025] 1. Manhole; 2. Solid section of pier top; 3. Prefabricated cover plate; 4. Distribution beam; 5. Bracket; 6. Climbing cone; 7. Hollow pier near the manhole; 8. Corbel; 9. Hollow pier far from the manhole; 10. Lifting lug; 11. Lifting rod. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] The embodiment of the present invention provides a construction method for a prefabricated cover plate at a manhole of a hollow pier, which can solve the problem in the related art of how to complete the construction of a prefabricated reinforced concrete cover plate at the manhole and reduce the construction difficulty.

[0028] See also Figure 1 and Figure 2As shown, a construction method for a prefabricated cover plate at a manhole of a hollow pier provided by an embodiment of the present invention may include: arranging a corbel 8 and a bracket 5 on opposite sides of the hollow pier; hoisting the prefabricated cover plate 3 so that its two ends are respectively placed on the corbel 8 and the bracket 5; pouring concrete in the hollow pier to form a solid section 2 at the top of the pier and a manhole 1, and the manhole 1 is located above the bracket 5, and the bracket 5 is removed after pouring. In this embodiment, by supporting the two ends of the reinforced concrete prefabricated cover plate A at the manhole 1 on different structures, the corbel 8 is poured on the hollow pier body at the far manhole 9 of the hollow pier, one end of the prefabricated cover plate 3 is supported on the corbel 8, and the near manhole 7 of the hollow pier is connected to the triangular bracket through the pre-buried climbing cone 6, and the other end of the prefabricated cover plate 3 is supported on the bracket 5, which completes the reservation of the manhole 1 and is safe and economical.

[0029] See also Figure 6 As shown, in some embodiments, the prefabricated cover plate 3 is provided with a hanging bar 11; after the prefabricated cover plate 3 is hoisted, the method may further include: connecting the hanging bar 11 to the steel bars of the solid section 2 of the pier top. In this embodiment, after the prefabricated cover plate 3 is hoisted, before the concrete of the top of the hollow pier is poured, the hanging bar 11 needs to be implanted into the solid section to be poured at the pier top, and connected to the upper pier top steel bars. The newly added prefabricated cover plate 3 and the solid section 2 of the pier top are connected as a whole through the hanging bar 11, and the whole is stressed, which is safer and more reliable. This can avoid the unfavorable stress on the cantilever at one end of the prefabricated cover plate 3 at the manhole 1 after the bracket 5 is disassembled.

[0030] See also Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments, providing the corbels 8 and the brackets 5 on opposite sides of the hollow pier may include pre-embedding a climbing cone 6 in the hollow pier and fastening the climbing cone 6 to the bracket 5 with bolts. In this embodiment, before the brackets 5 are installed, four climbing cones 6 are pre-embedded near the manhole 1 before the pier body of the high hollow pier is cast. Two integrally welded triangular brackets are connected to the climbing cones 6 via high-strength bolts. After the concrete pouring of the solid section 2 at the pier top is completed, the brackets 5 can be easily disassembled, resulting in efficient and convenient construction.

[0031] See also Figure 2 and Figure 3As shown, in some embodiments, a distribution beam 4 is fixed above the bracket 5, and the distribution beam 4 is supported below the prefabricated cover plate 3; the removal of the bracket 5 may include: loosening the bolts, lowering the bracket 5 and the distribution beam 4 as a whole, and hanging out the distribution beam 4 and the bracket 5 from the manhole 1. In this embodiment, the distribution beam 4 is placed between the two upper cross bars of the bracket 5. In order to ensure stable force, the distribution beam 4 and the bracket 5 should be fixed in a limited position. When the bracket 5 is disassembled, first loosen the climbing cone bolts, lower the bracket 5 and the distribution beam 4 on the bracket 5 as a whole, and then hang out the distribution beam 4 from the manhole 1. After repeated calculations and verifications, after the bracket 5 is disassembled, it can be hung out from the diagonal direction of the manhole 1, and the disassembled bracket 5 can be reused, which improves economic efficiency.

[0032] See also Figure 5 As shown, in some embodiments, the prefabricated cover plate 3 is welded with a lifting lug 10, and the prefabricated cover plate 3 is hoisted using the lifting lug 10. In this embodiment, before the prefabricated cover plate 3 is hoisted, the lifting lug 10 needs to be welded and installed on the prefabricated cover plate 3, and the lifting lug steel bars need to be firmly welded to the prefabricated plate steel bars to ensure the reliability of the connection and the safety of the hoisting.

[0033] See also Figure 4 As shown, in some embodiments, before pouring the concrete corbels at the far end of the high-center pier body, a pouring formwork is set up.

[0034] See also Figure 6 As shown, a construction structure of a prefabricated cover plate at a manhole of a hollow pier provided by an embodiment of the present invention may include: a corbel 8 and a bracket 5 arranged on opposite sides of the hollow pier, and the bracket 5 is located below the manhole 1; a prefabricated cover plate 3, both ends of which are respectively placed on the corbel 8 and the bracket 5, and the top of the prefabricated cover plate 3 is used to cast the solid section 2 of the pier top. In this embodiment, since a manhole 1 is reserved near the manhole for maintenance personnel to inspect, if concrete corbels are also used, the corbels need to be chiseled out after the casting is completed, and the construction is more complicated and uneconomical. By using the bracket 5, the use of the manhole 1 during the construction process is not affected, and the installation and disassembly are convenient, the structure is light, and the disassembled bracket 5 can still be reused repeatedly, thereby improving construction efficiency, shortening the construction period, and being economical and practical.

[0035] See also Figure 2As shown, in some embodiments, the precast cover plate 3 is provided with a hanger 11, and the hanger 11 is used to connect with the steel bars of the solid section 2 of the pier top. In this embodiment, since the upper concrete of the hollow pier top has been poured, after the bracket 5 is removed, one end of the precast cover plate 3 near the manhole is in a cantilever state, which is unfavorable for stress. By arranging the hanger 11 in the precast cover plate 3, half of the hanger 11 is poured in the precast cover plate 3 and the other half extends outward, after the precast cover plate 3 is hoisted into place, the protruding part of the hanger 11 is implanted into the solid section to be poured at the pier top, and is connected to the steel bars of the upper solid section of the hollow pier top, so that the precast plate and the solid section of the pier top are integrated into one, and better stress is borne.

[0036] See also Figure 5 As shown, in some embodiments, the precast cover plate 3 is welded with a lifting lug 10 for lifting. In this embodiment, the reinforced concrete precast slab has a large deadweight. By providing the lifting lug 10 on the precast cover plate 3 and welding the lifting lug 10 to the precast slab reinforcement, a lifting point is provided during the lifting process, making lifting safer and more convenient.

[0037] See also Figure 2 As shown, in some embodiments, the length of the bracket 5 is greater than the width of the manhole 1. In this embodiment, the dimensions of the manhole 1 are 790×800mm, and the crossbar of the bracket 5 is slightly longer than the width of the manhole 1, with a crossbar length of 900mm. While ensuring the size of the manhole 1 is constant and construction is economical, the ends of the prefabricated cover 3 can fall completely on the distribution beam 4, providing more stable and reliable force.

[0038] See also Figure 2 As shown, in some embodiments, a distribution beam 4 is fixed above the bracket 5 , and the distribution beam 4 is supported below the prefabricated cover plate 3 .

[0039] Specifically, the construction method of the prefabricated cover plate at the manhole of the hollow pier of the present invention includes the following steps:

[0040] 1. Concrete corbel pouring

[0041] Opposite to the bracket 5 , a C40 concrete corbel 8 is cast together with the main structure at the far end of the hollow pier 9 as a placement platform for one end of the prefabricated cover plate 3 .

[0042] 2. Bracket installation

[0043] Eight climbing cones 6 are pre-embedded at four pre-embedded locations near the manhole 7 of the hollow pier. Compared to traditional pre-embedded parts, climbing cones 6 are easier to process and install, have a higher load-bearing capacity, and are practical and economical. Two brackets 5 are connected to the climbing cones 6 via high-strength bolts. A 20a steel distribution beam 4 is installed above the crossbar of the climbing cones 6, and the distribution beam 4 is fixed to the crossbar of the climbing cones 6 in a limited manner.

[0044] 3. Hoisting of reinforced concrete prefabricated cover

[0045] After the corbel 8 is cast and reaches full strength, and the bracket 5 is installed, the precast cover 3, made of C40 concrete, is hoisted. The precast cover 3 is hoisted using lifting lugs 10 welded to the plate, with one end resting on the corbel 8 and the other on the distribution beam 4 of the bracket 5. To ensure the cantilever end of the cover is secure after the bracket 5 is removed, a hanger 11 is installed at the cantilever end of the precast cover 3. The hanger 11 is connected to the reinforcement of the main structure of the pier top solid section 2.

[0046] 4. Pour the solid section concrete on the pier top formwork

[0047] After the pier top cover plates are all installed, the main structural steel bars are installed, the formwork is hoisted, a manhole 1 is reserved, and the concrete of the solid section 2 of the pier top is poured.

[0048] 5. Bracket disassembly

[0049] After the concrete pouring of the solid section 2 of the pier top is completed, the bracket 5 is removed. Loosen the bolts of the climbing cone 6, lower the bracket 5 and the distribution beam 4 on the bracket as a whole, then lift the distribution beam 4 out of the manhole 1, and drag the bracket 5 out along the diagonal direction of the manhole 1.

[0050] The principles of the construction method and structure of a prefabricated cover plate at a hollow pier manhole provided in an embodiment of the present invention are as follows:

[0051] The present invention installs a climbing cone 6 and a bracket 5 near the manhole of the hollow pier. An I-beam distribution beam 4 is placed on the bracket 5, and the distribution beam 4 and bracket 5 are fixed with a limiter. A concrete corbel 8 is cast at the hollow pier away from the manhole. Precast cover plate hanger bars 11 are embedded in the solid section of the pier top to be cast, integrating the newly added precast plate with the solid section 2 of the pier top. The precast cover plate 3 at the manhole 1 is placed on the distribution beam 4 at one end and on the concrete corbel 8 at the other end. After the concrete at the pier top is poured and cured to reach the required strength, the bracket is removed, completing the construction. The bracket 5 is lightweight and easy to disassemble. The disassembled bracket 5 can be reused repeatedly, reducing costs, improving economic efficiency, and achieving a balance between production and conservation.

[0052] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is 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, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0053] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0054] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A construction method for prefabricated cover plates at hollow pier manholes, characterized in that: It includes: Corbels (8) and brackets (5) are respectively provided on opposite sides of the hollow pier; Hoisting the prefabricated cover plate (3) so that its two ends are respectively placed on the corbel (8) and the bracket (5); Concrete is poured in the hollow pier to form a pier top solid section (2) and a manhole (1), and the manhole (1) is located above the bracket (5). After the pouring is completed, the bracket (5) is removed; The corbels (8) and brackets (5) are respectively provided on opposite sides of the hollow pier, including: Embedding a climbing cone (6) in the hollow pier, and connecting and fixing the climbing cone (6) to the bracket (5) using bolts; The prefabricated cover plate (3) is provided with a hanging rod (11); After the prefabricated cover plate (3) is hoisted, the method further comprises: Connecting the hanger bar (11) to the steel bars of the pier top solid section (2); A distribution beam (4) is fixed above the bracket (5), and the distribution beam (4) is supported below the prefabricated cover plate (3); The step of removing the bracket (5) comprises: Loosen the bolts, lower the bracket (5) and the distribution beam (4) as a whole, and lift the distribution beam (4) and the bracket (5) out from the manhole (1).

2. The construction method of the prefabricated cover plate at the manhole of the hollow pier according to claim 1, characterized in that: A lifting lug (10) is welded to the prefabricated cover plate (3), and the prefabricated cover plate (3) is hoisted using the lifting lug (10).

3. A construction structure of a prefabricated cover plate at a hollow pier manhole, characterized in that: It includes: Corbels (8) and brackets (5) are arranged on opposite sides of the hollow pier, and the brackets (5) are located below the manhole (1); The prefabricated cover plate (3) has two ends respectively placed on the corbel (8) and the bracket (5), and the top of the prefabricated cover plate (3) is used to cast the pier top solid section (2).

4. The construction structure of the prefabricated cover plate at the manhole of the hollow pier according to claim 3, characterized in that: The prefabricated cover plate (3) is provided with a hanger bar (11), and the hanger bar (11) is used to be connected to the steel bars of the pier top solid section (2).

5. The construction structure of the prefabricated cover plate at the manhole of the hollow pier according to claim 3, characterized in that: The prefabricated cover plate (3) is welded with a lifting lug (10) for lifting.

6. The construction structure of the prefabricated cover plate at the manhole of a hollow pier according to claim 3, characterized in that: The length of the bracket (5) is greater than the width of the manhole (1).

7. The construction structure of the prefabricated cover plate at the manhole of a hollow pier according to claim 3, characterized in that: A distribution beam (4) is fixed above the bracket (5), and the distribution beam (4) is supported below the prefabricated cover plate (3).

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