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

Abstract

The invention relates to a construction method and structure for a prefabricated cover plate at a manhole of a hollow pier. The construction method comprises the steps that a bracket and a bracket are arranged on the two opposite sides in the hollow pier correspondingly; a prefabricated cover plate is hoisted, and the two ends of the prefabricated cover plate are erected on the bracket and the bracket correspondingly; and concrete pouring is conducted in the hollow pier to form a pier top solid section and a manhole, the manhole is located above the bracket, and the bracket is dismantled after pouring is completed. The bracket is installed at the position, close to the manhole, of the pier body, the bracket is poured at the position, far away from the manhole, of the pier body, then the two ends of the prefabricated cover plate are erected on the bracket and the bracket correspondingly, after concrete pouring of the pier top is completed, the bracket can be dismantled, reservation of the manhole is completed, safety and economy are achieved, the bracket is convenient to install and dismantle and light in structure, and the dismantled bracket can still be repeatedly used; the construction efficiency is improved, the construction period is shortened, and economy and practicability are achieved.

Description

Technical Field

[0001] The 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 solid piers, this can save masonry materials and reduce weight, which can not only ensure the safety of the bridge, but also ensure the economic and social benefits of the construction. When pouring the top of the hollow pier, in order to prevent the concrete from falling into the pier body, it is necessary to set up a prefabricated reinforced concrete cover plate on the top of the pier, and the cover plate is supported on the pier body bracket. The prefabricated reinforced concrete cover plate is mainly used for covering the top of the pier in bridge construction. After the covering is completed, the concrete on the top of the pier can be poured. The advantages of the prefabricated reinforced concrete cover plate are convenient construction and high efficiency.

[0003] In recent years, with the rapid development of domestic and foreign transportation, the substantial increase in transportation volume, the increasing vehicle load, and the long-term effects of the natural environment (atmospheric corrosion, temperature, humidity changes, etc.) and the use environment (increased load frequency, fatigue of materials and structures, etc.), many bridges have gradually failed to meet the requirements of modern transportation, directly threatening the safety of people's lives and property. Therefore, research on the maintenance, reinforcement and repair of bridge structures has attracted widespread attention. Compared with the superstructure, the substructure of the bridge is more susceptible to disease. The manhole is an important passage for the inspection and maintenance of the bridge piers. The maintenance personnel enter the bridge piers through the manhole and ladder, and use the inspection platform set in the bridge piers to inspect the bridge piers. At the top of the hollow pier, it is necessary to reserve a manhole and complete the erection of the cover plate, which makes the construction more difficult. Summary of the invention

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

[0005] In a first aspect, a construction method for a prefabricated cover plate at a manhole of a hollow pier is provided, which comprises: respectively 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 removing the bracket after pouring is completed.

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

[0007] In some embodiments, the step of respectively 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 pre-embedded climbing cone to the bracket by 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 dismantling of the bracket includes: loosening the climbing cone, lowering the bracket and the distribution beam as a whole, and lifting the distribution beam and the bracket out from the manhole.

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

[0010] In the second aspect, a construction structure of a prefabricated cover plate at a manhole of a hollow pier is provided, which comprises: 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 erected on the corbel and the bracket, and the top of the prefabricated cover plate is used for casting a solid section of the pier top.

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

[0012] In some embodiments, lifting ears 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 far 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 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 of a hollow pier provided by an embodiment of the present invention;

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

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

[0024] Numbers in the figure:

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

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 creative work are 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 of how to complete the construction of a prefabricated reinforced concrete cover plate at the manhole in the related art and reduce the construction difficulty.

[0028] See also Figure 1 and Figure 2As shown, a construction method of 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 on 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 the pouring is completed. In this embodiment, by making the two ends of the reinforced concrete prefabricated cover plate A at the manhole 1 supported 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, the near manhole 7 of the hollow pier is connected to the triangular bracket through the embedded climbing cone 6, and the other end of the prefabricated cover plate 3 is supported on the bracket 5, which not only completes the reservation of the manhole 1 but also is safe and economical.

[0029] See also Figure 6 As shown, in some embodiments, the prefabricated cover plate 3 is provided with a hanging rod 11; after the prefabricated cover plate 3 is hoisted, it can also include: connecting the hanging rod 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 on the top of the hollow pier is poured, the hanging rod 11 needs to be implanted into the solid section to be poured on 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 rod 11, and the whole is stressed, which is safer and more reliable. It can avoid that after the bracket 5 is disassembled, the cantilever at one end of the prefabricated cover plate 3 at the manhole 1 is unfavorably stressed.

[0030] See also Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the corbels 8 and the brackets 5 are respectively provided on opposite sides of the hollow pier, which may include: pre-embedded climbing cones 6 in the hollow pier, and the pre-embedded climbing cones 6 are connected and fixed to the brackets 5 by 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 poured, and the two integrally welded triangular brackets are connected to the climbing cones 6 by high-strength bolts. After the concrete pouring construction of the solid section 2 on the top of the pier is completed, the brackets 5 are easy to disassemble, and the construction is efficient and convenient.

[0031] See also Figure 2 and Figure 3As shown, in some embodiments, a distribution beam 4 is fixed on the top of the bracket 5, and the distribution beam 4 is supported under the prefabricated cover plate 3; the removal of the bracket 5 may include: loosening the climbing cone 6, dropping 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 bolt, drop 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 continue to be used in reverse, which improves the economic benefits.

[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 bar needs to be welded firmly with the prefabricated plate steel bar 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 in 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, whose two ends are respectively mounted on the corbel 8 and the bracket 5, and the top of the prefabricated cover plate 3 is used for pouring the solid section 2 on 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 pouring, which makes the construction 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 prefabricated 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 is poured, after the bracket 5 is removed, one end of the prefabricated cover plate 3 near the manhole is in a cantilever state, which is unfavorable for stress. By configuring the hanger 11 in the prefabricated cover plate 3, half of the hanger 11 is poured in the prefabricated cover plate 3, and the other half is extended outward. After the prefabricated cover plate 3 is hoisted in place, the extended part of the hanger 11 is implanted into the solid section to be poured on the pier top, and is connected to the steel bars of the upper solid section of the hollow pier top, so that the prefabricated plate and the solid section of the pier top are integrated and better stressed.

[0036] See also Figure 5 As shown, in some embodiments, a lifting lug 10 for lifting is welded on the prefabricated cover plate 3. In this embodiment, the self-weight of the reinforced concrete prefabricated slab is relatively large. By arranging the lifting lug 10 on the prefabricated cover plate 3, the lifting lug 10 is welded and connected to the steel bar of the prefabricated slab, and a lifting point is provided during the lifting process, making the 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 size of the manhole 1 is 790×800mm, and the crossbar length of the bracket 5 is slightly longer than the width of the manhole 1, and the crossbar length is 900mm. On the basis of ensuring that the size of the manhole 1 is constant and the construction is economical, the end of the prefabricated cover plate 3 can fall completely on the distribution beam 4, and the force is more stable and reliable.

[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 comprises 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-buried at the four pre-buried points of the hollow pier near the manhole 7. Compared with traditional pre-buried parts, the climbing cone 6 is easier to process and install, has a higher load-bearing capacity, and is practical and economical. The two brackets 5 are connected to the climbing cone 6 by high-strength bolts, and the upper part of the climbing cone 6 crossbar is installed with a 20a steel distribution beam 4, and the distribution beam 4 is fixed to the climbing cone 6 crossbar.

[0044] 3. Lifting of reinforced concrete prefabricated cover

[0045] After the corbel 8 is cast and reaches the required strength and the bracket 5 is installed, the precast cover plate 3 is hoisted. The precast cover plate 3 is precast with C40 concrete. The precast cover plate 3 is hoisted by the lifting lug 10 welded on the precast cover plate 3, with one end resting on the corbel 8 and the other end resting on the distribution beam 4 of the bracket 5. To ensure the safety of the cantilever end of the cover plate after the bracket 5 is removed, the cantilever end of the precast cover plate 3 is equipped with a hanging rod 11, which is connected to the steel bars of the main structure of the solid section 2 of the pier top.

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

[0047] After the pier top cover is completely installed, the main structure reinforcement is installed, the formwork is hoisted, a manhole 1 is reserved, and concrete is poured for the solid section 2 of the pier top.

[0048] 5. Bracket removal

[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 hoist 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 construction method and structural principle 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, and an I-beam distribution beam 4 is placed on the bracket 5. The distribution beam 4 and the bracket 5 should be fixed in a limited position. A concrete corbel 8 is cast at the hollow pier away from the manhole, and a prefabricated cover plate hanging rod 11 is implanted into the solid section to be cast at the top of the pier, so that the newly added prefabricated plate and the solid section 2 at the top of the pier are integrated. One end of the prefabricated cover plate 3 at the manhole 1 is placed on the distribution beam 4, and the other end is placed on the concrete corbel 8. After the concrete pouring of the top of the pier is completed and the curing reaches the strength, the bracket is disassembled to complete the construction. The bracket 5 has a light structure and is easy to disassemble. The disassembled bracket 5 can be repeatedly used, which reduces the cost, improves the economic benefit, and achieves both production and saving.

[0052] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 position, be constructed and operated in a specific position, 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 an indirect connection through an intermediate medium, or it can be a connection between the 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply 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 including 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, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0054] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A construction method for prefabricated cover plates at manholes in hollow piers, characterized in that: It includes: Corbels (8) and brackets (5) are respectively arranged on opposite sides of the hollow pier; The prefabricated cover plate (3) is hoisted 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 solid section (2) on the pier top and a manhole (1), and the manhole (1) is located above the bracket (5). After the pouring is completed, the bracket (5) is removed.

2. The construction method of the prefabricated cover plate at the manhole of the hollow pier according to claim 1, characterized in that: The prefabricated cover plate (3) is provided with a hanging rod (11); After the prefabricated cover plate (3) is hoisted, the method further comprises: The hanger bar (11) is connected to the steel bars of the pier top solid section (2).

3. The construction method of the prefabricated cover plate at the manhole of the hollow pier according to claim 1, characterized in that: The corbels (8) and brackets (5) are respectively arranged on opposite sides of the hollow pier and include: A climbing cone (6) is embedded in the hollow pier, and the embedded climbing cone (6) is connected and fixed to the bracket (5) by bolts.

4. The construction method of the prefabricated cover plate at the manhole of the hollow pier as claimed in claim 3 is 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); The removing of the bracket (5) comprises: The climbing cone (6) is loosened, the bracket (5) and the distribution beam (4) are lowered as a whole, and the distribution beam (4) and the bracket (5) are hoisted out from the manhole (1).

5. 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 on the prefabricated cover plate (3), and the prefabricated cover plate (3) is hoisted using the lifting lug (10).

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

7. The construction structure of the prefabricated cover plate at the manhole of the hollow pier as claimed in claim 6, 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).

8. The construction structure of the prefabricated cover plate at the manhole of the hollow pier as claimed in claim 6, characterized in that: The prefabricated cover plate (3) is welded with a lifting lug (10) for lifting.

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

10. The construction structure of the prefabricated cover plate at the manhole of the hollow pier according to claim 6, 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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