Large-diameter heat pipe fixing pier assembly structure and construction method thereof

Abstract

The present application relates to the technical field of direct-buried laying engineering of heat pipes, in particular to a large-diameter heat pipe fixed pier assembly structure; the large-diameter heat pipe fixed pier assembly structure comprises a fixed pier foundation and prefabricated reinforced concrete side plates, the prefabricated reinforced concrete side plates comprise two first reinforced concrete side plates and two second reinforced concrete side plates, the first reinforced concrete side plates and the second reinforced concrete side plates are connected in a head-to-tail mode along two sides of the fixed pier foundation in a horizontal direction of the fixed pier foundation to form a pouring space, the first reinforced concrete side plates and the second reinforced concrete side plates are each provided with a first steel bar at a top portion along a height direction of the fixed pier foundation, and the first reinforced concrete side plates and the second reinforced concrete side plates are each provided with a second steel bar along two sides of the fixed pier foundation in the horizontal direction; the present application further provides a construction method of the large-diameter heat pipe fixed pier assembly structure, the fixed pier foundation and the prefabricated reinforced concrete side plates are constructed synchronously, the side plates are used as a next step of a concrete pouring formwork, process waiting is avoided, and the total construction period is greatly shortened and the cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of direct burial engineering technology for thermal pipelines, specifically to a prefabricated structure for fixed piers of large-diameter thermal pipelines and its construction method. Background Technology

[0002] In the direct-buried laying of centralized heating pipelines in urban areas, reinforced concrete fixed piers are required at intervals along the pipeline to prevent excessive displacement of the heating pipelines due to temperature changes. Currently, the common structural forms of fixed piers are cast-in-place reinforced concrete fixed piers and fully precast buttress-type fixed piers. These have some drawbacks. For example, cast-in-place reinforced concrete fixed piers have long construction cycles, require on-site formwork erection and dismantling for each pier, have low formwork turnover rates, significant material waste, and involve a large amount of on-site wet work. Fully precast buttress-type fixed piers, for large-diameter pipelines with a diameter greater than 1 meter, require enormous pier volumes, resulting in heavy precast components, extremely high transportation costs, and significant on-site hoisting difficulties and safety risks. Furthermore, the stress mode of buttress-type structures under pipeline thrust is more complex, and the design calculations differ from those for cast-in-place structures, increasing technical uncertainties.

[0003] Therefore, it is urgent to improve the existing structure of the fixed support for heating pipelines and solve the technical defects of the existing technical solutions. Summary of the Invention

[0004] The purpose of this invention is to provide an assembled structure for a fixed support of a large-diameter thermal pipeline to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a prefabricated structure for a fixed pier of a large-diameter thermal pipeline, comprising a fixed pier foundation and precast reinforced concrete side panels. The precast reinforced concrete side panels include two first reinforced concrete side panels and two second reinforced concrete side panels. The first and second reinforced concrete side panels are connected end to end along the horizontal direction of the fixed pier foundation to form a casting space, and both the first and second reinforced concrete side panels are vertically and fixedly connected to the fixed pier foundation. Both the first and second reinforced concrete side plates have first reinforcing bars at the top along the height direction of the fixed pier foundation, and both the first and second reinforced concrete side plates have second reinforcing bars on both sides along the horizontal direction of the fixed pier foundation.

[0006] Furthermore, the precast reinforced concrete side slabs have pipe passage openings, which correspond to the positions of the heating pipes, and the surrounding area of ​​the pipe passage openings is reinforced with steel bars.

[0007] Furthermore, a third reinforcing bar is reserved at the top of the fixed pier foundation along the height direction.

[0008] Furthermore, grouting sleeves are pre-embedded at the bottom of the precast reinforced concrete side plate along the height direction of the fixed pier foundation. The grouting sleeves are provided with grouting holes and grout outlet holes, and the spacing of the grouting sleeves is consistent with that of the third reinforcing bar.

[0009] Furthermore, hooks are pre-embedded at the top of the precast reinforced concrete side panels along the height direction of the fixed pier foundation.

[0010] Furthermore, both the first and second reinforced concrete side plates include a protective layer, which extends to both sides along the horizontal direction of the fixed pier foundation. The first and second reinforced concrete side plates form a casting space through the extension.

[0011] Compared with the prior art, the beneficial effects of the above-mentioned technical solution of the present invention are: This invention can easily adapt to engineering needs of pipes with different diameters and different water supply and return pipe spacings by adjusting the size of the precast reinforced concrete side plate and the position of its reserved opening, thus greatly improving its versatility.

[0012] The second objective of this invention is to provide a construction method for the aforementioned prefabricated structure of a fixed pier for a large-diameter thermal pipeline, comprising the following steps: Step S1: Excavate the site to the required elevation for the fixed pier foundation, pour the fixed pier foundation, tie the reinforcing bars of the fixed pier foundation, and accurately reserve the third reinforcing bar. Step S2.1: Utilize the space around the site to lay out the formwork for the first and second reinforced concrete side panels, and tie the first and second reinforced concrete side panels and the reinforcing bars of the second reinforced concrete side panels through the formwork. Step S2.2: Reserve second reinforcing bars on both sides of the first and second reinforced concrete side plates along the horizontal direction of the fixed pier foundation, and reserve first reinforcing bars at the top of the first and second reinforced concrete side plates along the height direction of the fixed pier foundation. Step S3: Simultaneously pour and cure the first reinforced concrete side plate, the second reinforced concrete side plate and the fixed pier foundation; assemble the first reinforced concrete side plate and the second reinforced concrete side plate to form a pouring space; Step S4: When the compressive strength of the first and second reinforced concrete side plates reaches 80% of the design requirements, roughen the inside of the first and second reinforced concrete side plates, hoist the first and second reinforced concrete side plates to the top of the fixed pier foundation, align the grouting sleeve with the third reinforcing bar and slowly lower it into place, and then inject the grouting material. Step S5.1: Install the heating pipes, tie the ring-shaped steel bars around the heating pipes in the pouring space, and tie the steel bars at the top of the fixed pier. Step S5.2: Lap-connect the longitudinal reinforcement at the corner of the fixed pier foundation with the reinforcement at the corner of the third reinforcement; Step S5.3: Lap-connect the top reinforcing bar of the fixed pier with the first reinforcing bar; Step S6.1: Seal the joint between the first reinforced concrete side plate and the second reinforced concrete side plate, as well as the joint between the precast reinforced concrete side plate and the fixed pier foundation. Step S6.2: Pour concrete into the pouring space, then seal the hook and grind the sealed area smooth.

[0013] The above technical solution produces the following technical effects: This invention allows for the simultaneous construction of fixed pier foundations and precast reinforced concrete side panels, avoiding delays in construction processes and significantly shortening the overall construction period. The precast reinforced concrete side panels serve as permanent formwork during final pouring, saving the time and material waste associated with traditional cast-in-place methods for setting up and dismantling side formwork. Furthermore, the on-site fabrication of the precast reinforced concrete side panels completely eliminates the expensive long-distance transportation costs and traffic constraints associated with large precast components. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall schematic diagram of the present invention after casting is completed; Figure 3 This is a schematic diagram showing the disassembled structure of the present invention; Figure 4 This is a schematic diagram of the structure of the second reinforced concrete side plate of the present invention; Tag name: 1-Precast reinforced concrete side plate; 10-Fixed pier foundation; 2-First reinforced concrete side plate; 3-Second reinforced concrete side plate; 4-Third reinforcing bar; 5-Grouting sleeve; 6-Second reinforcing bar; 7-First reinforcing bar; 8-Extension; 9-Hook. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Example 1 Please refer to Figure 1-4This application provides a prefabricated structure for a fixed pier of a large-diameter thermal pipeline, including a fixed pier foundation 10 and precast reinforced concrete side plates 1. The fixed pier foundation 10 is positioned along the Y-direction along its height. A third reinforcing bar 4 is pre-installed at the top of the fixed pier foundation 10 along the Y-direction, and the third reinforcing bar 4 is perpendicular to the fixed pier foundation 10. The precast reinforced concrete side plates 1 include two first reinforced concrete side plates 2 and two second reinforced concrete side plates 3. Grouting sleeves 5 are pre-embedded at the bottom of the precast reinforced concrete side plates 1 along the height direction of the fixed pier foundation 10. The grouting sleeves 5 have grouting holes and grout outlet holes. The spacing between the grouting sleeves is consistent with that of the third reinforcing bars 4. After the grouting sleeves 5 are hoisted into place, they are connected to the third reinforcing bars 4 by injecting high-performance grout. The first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 are connected end-to-end along the horizontal direction of the fixed pier foundation 10 to form a pouring space. Furthermore, both the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 include a protective layer. The protective layer extends to both sides along the horizontal direction of the fixed pier foundation 10, forming extensions 8. The first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 form the pouring space through the extensions 8. The top of the pouring space is open along the Y direction. Preferably, the thickness of the protective layer is 50mm. Furthermore, both the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 are vertically fixed to the fixed pier foundation 10.

[0017] Furthermore, both the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 are provided with first reinforcing bars 7 at their top along the Y direction, and second reinforcing bars 6 are provided on both sides of the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 along the horizontal direction of the fixed pier foundation 10. It should be noted that the horizontal direction includes the length and width of the horizontal plane of the fixed pier foundation 10. Even further, the precast reinforced concrete side plate 1 has pipe passage openings, which correspond to the positions of the heating pipes. Reinforcing bars are provided around the pipe passage openings. The pipe passage openings pre-reserve space for the heating pipes, ensuring the accuracy of the pipe passage opening positions, reducing on-site construction work, improving construction efficiency, and avoiding damage to the precast reinforced concrete side plate 1 from on-site excavation of the pipe passage openings, thus ensuring the structural integrity of the side plate. Moreover, the pipe passage openings correspond to the positions of the heating pipes, precisely matching the routing and layout requirements of the heating pipes, reducing additional pipe stress caused by installation errors, and improving the long-term operational stability of the heating pipes. In addition, reinforcing steel bars compensate for the loss of structural bearing capacity caused by excavating the opening for pipe passage, improve the strength and crack resistance of the structure, avoid structural cracking and damage, and improve construction safety.

[0018] Furthermore, each of the precast reinforced concrete side panels 1 has a pre-embedded hook 9 at the top along the Y direction. After the precast reinforced concrete side panels 1 are produced, they need to be transported to the construction site for hoisting and positioning. The hook 9 can be directly connected to the slings and lifting tools of the hoisting equipment to bear the overall weight of the side panel, meet the stress requirements of the component transportation and hoisting process, have good overall stress resistance and high load-bearing strength, and ensure the safety of hoisting operations.

[0019] Furthermore, the sides of the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 furthest from the protective layer are both roughened surfaces, and the first reinforcing bar 7 and the second reinforcing bar 6 are both pre-embedded in the roughened surfaces. After the heating pipes are installed in the pouring space and the internal reinforcing bars are tied, the poured concrete, the roughened surfaces, and the fixed pier foundation 10 are combined to form a complete fixed pier prefabricated structure.

[0020] Example 2 Please continue to refer to this. Figure 1-4 The second objective of this application is to provide a construction method for the aforementioned prefabricated structure of a fixed pier for a large-diameter thermal pipeline, comprising the following steps: Step S1: Excavate the site to the required elevation of the fixed pier foundation 10, pour the fixed pier foundation 10, tie the steel bars of the fixed pier foundation 10, and accurately reserve the third steel bar 4.

[0021] Step S2.1: Utilize the space around the site to lay out the formwork for the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3, and tie the reinforcing bars of the first reinforced concrete side plate 2, the second reinforced concrete side plate 3 and the second reinforced concrete side plate 3 through the formwork.

[0022] Step S2.2: Reserve second reinforcing bars 6 on both sides of the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 along the horizontal direction of the fixed pier foundation 10, and reserve first reinforcing bars 7 at the top of the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 along the height direction of the fixed pier foundation 10. It should be noted that the length of the first reinforcing bar 7 needs to meet the requirement of the lap length of the reinforcing bar to meet the lap length of the top reinforcing bar of the fixed pier; the second reinforcing bar 6 needs to meet the requirement of the anchorage length of the reinforcing bar; the grouting sleeve 5 is provided with grouting holes and grout outlet holes, and the spacing of the grouting holes and grout outlet holes is consistent with that of the third reinforcing bar 4.

[0023] Step S3: Simultaneously pour and cure the first reinforced concrete side plate 2, the second reinforced concrete side plate 3 and the fixed pier foundation 10; after assembling the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3, a closed pouring space is formed to achieve the effect of a formwork. Step S4: When the compressive strength of the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 reaches 80% of the standard compressive strength of the concrete cube, the interior of the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 is roughened, and the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3 are hoisted to the top of the fixed pier foundation 10. The grouting sleeve 5 is aligned with the third reinforcing bar 4 and slowly lowered into place. Then, high-performance grouting material is injected into the grouting sleeve 5 to achieve a reliable grouting anchor connection between the precast reinforced concrete side plate 1 and the fixed pier foundation 10 to form an integral whole.

[0024] Step S5.1: Install the heating pipes, tie the ring-shaped steel bars around the heating pipes in the pouring space, and tie the steel bars at the top of the fixed pier. Step S5.2: Lap-connect the longitudinal steel bars at the corner of the fixed pier foundation 10 with the steel bars at the corner of the third steel bar 4; Step S5.3: Lap-connect the top steel bar of the fixed pier with the first steel bar 7; Step S6.1: Seal the joints between the first reinforced concrete side plate 2 and the second reinforced concrete side plate 3, as well as the joints between the precast reinforced concrete side plate 1 and the fixed pier foundation 10, to prevent grout leakage. Preferably, clamps are used to temporarily reinforce the corners of the precast reinforced concrete side plate 1 to avoid corner misalignment or positional deviation during subsequent concrete pouring operations, ensuring that the forming angle and geometric dimensions of the corner meet the design requirements. Furthermore, the clamp reinforcement can constrain the deformation of the precast reinforced concrete side plate, enhance the stability of the corner area and the overall support structure, and reduce safety risks during the support stage.

[0025] Step S6.2: Pour concrete into the pouring space, vibrate and compact it, then use mortar to seal the hook 9 and grind the sealed area smooth. The concrete poured this time will tightly combine the roughened surface of the precast reinforced concrete side plate 1 with the fixed pier foundation 10, and finally form a complete reinforced concrete fixed pier that is completely equivalent to the stress performance of the cast-in-place structure.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated structure for a fixed pier of a large-diameter thermal pipeline, comprising a fixed pier foundation (10) and precast reinforced concrete side panels (1), characterized in that, The precast reinforced concrete side plate (1) includes two first reinforced concrete side plates (2) and two second reinforced concrete side plates (3). The first reinforced concrete side plates (2) and the second reinforced concrete side plates (3) are connected end to end along the horizontal direction of the fixed pier foundation (10) to form a casting space. The first reinforced concrete side plates (2) and the second reinforced concrete side plates (3) are both vertically fixed to the fixed pier foundation (10). The first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) are provided with first reinforcing bars (7) at the top along the height direction of the fixed pier foundation (10), and the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) are provided with second reinforcing bars (6) on both sides along the horizontal direction of the fixed pier foundation (10).

2. The prefabricated structure for fixing large-diameter thermal pipelines according to claim 1, characterized in that, The precast reinforced concrete side plate (1) has a pipe passage opening, which corresponds to the position of the heating pipe, and the surrounding area of ​​the pipe passage opening is provided with reinforcing bars.

3. The prefabricated structure for fixed supports of large-diameter thermal pipelines according to claim 1, characterized in that, The fixed pier foundation (10) has a third steel bar (4) reserved at the top along the height direction.

4. The prefabricated structure for fixing large-diameter thermal pipelines according to claim 3, characterized in that, The precast reinforced concrete side plate (1) has a grouting sleeve (5) embedded at the bottom along the height direction of the fixed pier foundation (10). The grouting sleeve (5) has a grouting hole and a grout outlet hole. The spacing of the grouting sleeve is consistent with that of the third steel bar (4).

5. The prefabricated structure for fixing large-diameter thermal pipelines according to claim 1, characterized in that, The top of each of the precast reinforced concrete side panels (1) along the height direction of the fixed pier foundation (10) is pre-embedded with hooks (9).

6. The prefabricated structure for fixing large-diameter thermal pipelines according to claim 1, characterized in that, Both the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) include a protective layer. The protective layer extends to both sides in the horizontal direction of the fixed pier foundation (10) to form an extension (8). The first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) form a pouring space through the extension (8).

7. A construction method for the prefabricated structure of a fixed pier for a large-diameter thermal pipeline as described in any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Excavate the site to the required elevation of the fixed pier foundation (10), pour the fixed pier foundation (10), tie the steel bars of the fixed pier foundation (10), and accurately reserve the third steel bar (4). Step S2.1: Use the space around the site to lay out the formwork for the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3), and tie the reinforcing bars of the first reinforced concrete side plate (2), the second reinforced concrete side plate (3) and the second reinforced concrete side plate (3) through the formwork. Step S2.2: Reserve second reinforcing bars (6) on both sides of the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) along the horizontal direction of the fixed pier foundation (10), and reserve first reinforcing bars (7) on the top of the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) along the height direction of the fixed pier foundation (10). Step S3: Simultaneously pour and cure the first reinforced concrete side plate (2), the second reinforced concrete side plate (3) and the fixed pier foundation (10); after assembling the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3), a pouring space is formed; Step S4: When the concrete compressive strength of the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) reaches 80% of the standard concrete cube compressive strength, the interior of the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) is roughened, and the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) are hoisted to the top of the fixed pier foundation (10), so that the grouting sleeve (5) is aligned with the third reinforcing bar (4) and slowly lowered into place, and then the grouting sleeve (5) is filled with grout. Step S5.1: Install the heating pipe, tie the ring-shaped steel bars around the heating pipe in the pouring space, and tie the steel bars at the top of the fixed pier. Step S5.2: Connect the longitudinal steel bars at the corner of the fixed pier foundation (10), the annular steel bars, and the steel bars at the corner of the third steel bar (4) by lapping. Step S5.3: Lap-connect the top steel bar of the fixed pier with the first steel bar (7); Step S6.1: Seal the joint between the first reinforced concrete side plate (2) and the second reinforced concrete side plate (3) and the joint between the precast reinforced concrete side plate (1) and the fixed pier foundation (10); Step S6.2: Pour concrete into the pouring space, then seal the hook (9) and grind the sealed area flat.

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