A connection node used in the construction of a heating network well chamber reinforced concrete structure

Abstract

This application discloses a connection node used in the construction of a reinforced concrete structure for a heating network well chamber, belonging to the technical field of connection nodes in building engineering. To address the problem of connecting the large-sized precast steel cage to the well chamber base in existing large-scale heating network well chamber construction, this application embeds a pre-embedded part in the well chamber base and uses this pre-embedded part to replace the traditional connecting steel bars of the well chamber base as the connection part with the precast steel cage. Simultaneously, the steel bar connection part is used to fix the precast steel cage to the well chamber base. This design optimizes the connection between the steel bars in the traditional precast steel cage and connecting steel bars into a connection between the pre-embedded part and the steel bar connection part, and optimizes the traditional regional steel bar connection into a point connection of multiple load-bearing points. This design greatly reduces the workload of fixing the precast steel cage to the well chamber base and also reduces the connection difficulty. This application is mainly used as a connection node in the construction of a reinforced concrete structure for a heating network well chamber.

Description

Technical Field

[0001] This utility model belongs to the technical field of connection nodes in building engineering, and specifically relates to a connection node used in the construction of a heating network well chamber steel reinforcement structure. Background Technology

[0002] Heating network manholes are an important component of the pre-embedded heating network pipelines. Generally, they serve as inspection wells to control the flow velocity and volume of water in the heating network pipelines within a given area. Construction typically begins with excavating a foundation pit, followed by the construction of the manhole base at the bottom of the pit. The base usually consists of two layers: a lower concrete foundation layer and an upper reinforced concrete layer. The main body of the manhole is then constructed on the reinforced concrete layer. For small manholes, precast concrete structures can be used, meaning the reinforced concrete structure is cast in a factory according to the design requirements and then hoisted onto the base. Concrete is then applied to the joint between the main body and the base for fixation. Alternatively, a precast steel cage structure can be used, which is then fixed to pre-reserved connecting steel bars on the base before being cast in the foundation pit. For large manhole structures, the steel cage structure is typically constructed directly on the base, and then... The reason why large-scale well chamber structures are not prefabricated is that, firstly, the prefabricated reinforced concrete structure of a large well chamber is too heavy to be hoisted; secondly, although the prefabricated steel cage structure can meet the hoisting requirements, its large size and large number of steel bars make it difficult to connect and fix it with the reserved steel bars on the base. The disadvantages of directly constructing the steel cage structure on the well chamber base are: firstly, the operating space in the construction area within the foundation pit is limited; secondly, construction can only begin after the well chamber base is completely constructed, delaying construction time; and thirdly, construction within the foundation pit relies solely on manual labor for steel bar erection and fixing, and is greatly affected by environmental factors, impacting construction efficiency. Therefore, developing a connection node to simplify the connection between the prefabricated steel cage and the well chamber base in the construction of large-scale heating network well chambers, based on the inconveniences of the existing steel structure construction, is very much in line with practical needs, allowing the construction of large-scale heating network well chambers to use prefabricated steel cages. Utility Model Content

[0003] In order to solve the problem that the prefabricated steel cage is too large to be easily connected to the well base in the construction of existing large-scale heating network well chambers, this utility model provides a connection node used in the construction of the steel reinforcement structure of the heating network well chamber.

[0004] A connection node used in the construction of a heating network well chamber steel reinforcement structure, the connection node includes a pre-embedded part and a steel reinforcement connection part, the pre-embedded part is pre-embedded in the well chamber base, and the steel reinforcement connection part is set on the top of the pre-embedded part and is detachably connected to the pre-embedded part.

[0005] The embedded part includes an embedded cone, which is erected in the concrete foundation layer in the well chamber base. The bottom end of the embedded cone extends to the lower part of the concrete foundation layer and is inserted into the soil layer at the bottom of the foundation pit. A limiting plate is fixed to the top of the embedded cone, and a connecting seat is fixed to the top of the limiting plate. Multiple sets of steel reinforcement lap splices are fixed to the side wall of the connecting seat along the circumference. Both the limiting plate and the connecting seat are located in the rebar concrete layer in the well chamber base. The steel reinforcement lap splices are used to support and fix the steel mesh in the rebar concrete layer. The top of the connecting seat is coplanar with the top of the rebar concrete layer and is detachably connected to the steel reinforcement connection part.

[0006] Furthermore, the embedded cone includes a cross steel fixing plate, which is fixed at the center of the bottom of the limiting plate. The outside of the cross steel fixing plate is wrapped with a concrete wrapping layer, which is cylindrical and has a pointed bottom.

[0007] Furthermore, the connecting seat is a block structure, and multiple threaded holes are machined at equal intervals along the circumference at the edge of the top of the connecting seat. The connecting seat and the steel bar connection part are connected and disassembled by multiple connecting bolts.

[0008] Furthermore, the connecting seat is a hollow block structure;

[0009] Furthermore, the rebar connection includes a connecting plate, and multiple connecting strip holes are equidistantly machined along the circumferential direction at the top edge of the connecting plate. Each connecting strip hole is correspondingly matched with a connecting threaded hole. A retaining sleeve is fixedly connected at the top center of the connecting plate, and the enclosed area of ​​the retaining sleeve is the arrangement area of ​​the extended rebar group.

[0010] Furthermore, multiple reinforcing ribs are arranged circumferentially on the outside of the retaining sleeve, the side of each reinforcing rib is fixedly connected to the retaining sleeve, and the bottom of each reinforcing rib is fixedly connected to the top of the connecting plate.

[0011] Furthermore, a limiting sleeve is fixedly connected to the upper part of the outer side wall of the connecting seat in the circumferential direction. The top of the limiting sleeve is set higher than the top of the connecting seat. The limiting sleeve is used to circumferentially limit the connecting plate to improve the docking accuracy between the connecting plate and the connecting seat.

[0012] Furthermore, the connecting seat is a block structure, and an extension sleeve is fixedly connected to the top of the connecting seat. A set of limiting pin holes are machined on the front and rear sides of the extension sleeve. A limiting pin is inserted into each limiting pin hole, and the limiting pin is interference-fitted with the limiting pin hole. The steel bar connecting part is inserted into the extension sleeve and is detached and connected to the extension sleeve through the pin.

[0013] The limiting pin hole is a tapered hole. The large end of the limiting pin hole is connected to the outer side wall of the extension sleeve, and the small end of the limiting pin hole is connected to the inner side wall of the extension sleeve. The pin is a tapered pin that cooperates with the limiting pin hole.

[0014] The rebar connection includes a connecting plate, and a retaining sleeve is fixedly connected to the top of the connecting plate. The enclosed area of ​​the retaining sleeve is the arrangement area of ​​the extended rebar group, and the top of the retaining sleeve is located below the limiting pin hole.

[0015] The beneficial effects of this application compared to the prior art are:

[0016] This application provides a connection node for the construction of a heating network well chamber reinforced concrete structure. By embedding a pre-embedded part in the well chamber base and using the pre-embedded part to replace the traditional connecting steel bars of the well chamber base as the connection part with the precast steel cage, the connection node is fixed to the well chamber base in conjunction with the steel bar connection part. Through the design of this application, the connection between steel bars in the traditional precast steel cage and connecting steel bars is optimized into the connection between the pre-embedded part and the steel bar connection part. The traditional regional steel bar connection is optimized into a point connection of multiple load-bearing points. This design greatly reduces the amount of work required to fix the precast steel cage to the well chamber base, and also reduces the connection difficulty. At the same time, it allows the precast steel cage to be applied to the construction of large heating network well chambers.

[0017] The connection node provided in this application for the construction of the steel reinforcement structure of the heating network well chamber can be completed within the factory area, eliminating the need for workers to construct it on-site in the foundation pit. It also frees the construction of the steel reinforcement cage from the constraints of the well chamber base, allowing it to be constructed synchronously with the well chamber base. This greatly shortens the overall construction time of the heating network well chamber and improves the construction efficiency of the heating network well chamber. Attached Figure Description

[0018] Figure 1 This is a connection diagram of the connection nodes in a specific embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the connection node in a specific embodiment of this application;

[0020] Figure 3 This is a top view of the embedded part in the first specific embodiment of this application;

[0021] Figure 4 This is a top view of the embedded part in the second specific embodiment of this application;

[0022] Figure 5 These are top views of the steel bar connection parts in Specific Embodiment 1 and Specific Embodiment 2 of this application;

[0023] Figure 6 This is a partial cross-sectional schematic diagram of the embedded part in Specific Embodiment 1 and Specific Embodiment 2 of this application;

[0024] Figure 7 This is a schematic diagram of the connection node in the third specific embodiment of this application;

[0025] Figure 8 This is a schematic diagram of the connection nodes in the third specific embodiment of this application;

[0026] Figure 9 This is a top view of the embedded part in the third specific embodiment of this application;

[0027] Figure 10 This is a schematic diagram illustrating the operation of the connecting nodes in this application;

[0028] Figure 11 This is a schematic diagram showing the arrangement of the connecting nodes in this application;

[0029] Figure 12 A schematic diagram showing the layout of the reinforced concrete layer for the connection nodes in this application;

[0030] Figure 13 This is a top view of the precast steel reinforcement cage supporting the connection node in this application. Detailed Implementation

[0031] Specific implementation method one: Combining Figures 1 to 6 This embodiment describes a connection node used in the construction of a heating network well chamber steel reinforcement structure. The connection node includes a pre-embedded part 1 and a steel reinforcement connection part 2. The pre-embedded part 1 is pre-embedded in the well chamber base, and the steel reinforcement connection part 2 is disposed on the top of the pre-embedded part 1 and is detachably connected to the pre-embedded part 1.

[0032] The pre-embedded part 1 includes a pre-embedded cone 11, which is erected in the concrete foundation layer 7 in the well chamber base. The bottom end of the pre-embedded cone 11 extends to the lower part of the concrete foundation layer 7 and is inserted into the soil layer 6 at the bottom of the foundation pit. The top of the pre-embedded cone 11 is fixedly connected to a limiting plate 12. The top of the limiting plate 12 is fixedly connected to a connecting seat 13. Multiple sets of steel reinforcement lap splice units 14 are fixedly connected to the side wall of the connecting seat 13 along the circumferential direction. The limiting plate 12 and the connecting seat 13 are both located in the rebar-reinforced concrete layer 8 in the well chamber base. The steel reinforcement lap splice unit 14 is used to support and fix the steel mesh in the rebar-reinforced concrete layer 8. The top of the connecting seat 13 is coplanar with the top of the rebar-reinforced concrete layer 8 and is detachably connected to the steel reinforcement connection part 2.

[0033] The embedded cone 11 includes a cross steel fixing plate 111, which is fixed at the center of the bottom of the limiting plate 12. The outside of the cross steel fixing plate 111 is wrapped with a concrete wrapping layer 112, which is a cylinder and has a pointed bottom.

[0034] The connecting seat 13 is a block structure. Multiple threaded holes 131 are machined at equal intervals along the circumference at the edge of the top of the connecting seat 13. The connecting seat 13 and the steel bar connection part 2 are connected and disassembled by multiple connecting bolts.

[0035] The rebar connection part 2 includes a connecting plate 21. Multiple connecting strip holes 211 are machined at equal intervals along the circumference at the top edge of the connecting plate 21. Each connecting strip hole 211 is correspondingly matched with a connecting threaded hole 131. A retaining sleeve 22 is fixedly connected at the top center of the connecting plate 21. The enclosed area of ​​the retaining sleeve 22 is the arrangement area of ​​the extended rebar group 3.

[0036] The outer side of the retaining sleeve 22 is provided with multiple reinforcing ribs 23 along the circumferential direction. The side of each reinforcing rib 23 is fixedly connected to the retaining sleeve 22, and the bottom of each reinforcing rib 23 is fixedly connected to the top of the connecting plate 21.

[0037] This embodiment provides a connection node used in the construction of a heating network well chamber reinforced concrete structure. The pre-embedded cone 11 also participates in the construction of the well chamber base during its arrangement. When constructing the well chamber base, a base arrangement trench is first excavated at the bottom of the foundation pit. Traditionally, the well chamber base is arranged by directly pouring a concrete foundation layer 7 into the base arrangement trench. After the concrete foundation layer 7 is fixed, support bricks are arranged on top of it, and steel mesh is simultaneously laid on the support bricks. Using the steel mesh as anchoring, another layer of concrete is poured to form an anchored concrete layer 8. The concrete foundation layer 7 and the anchored concrete layer 8 together constitute the well chamber base structure, serving as support for the main body of the well chamber. When using the connection node provided in this application for well chamber construction, after excavating the base arrangement trench at the bottom of the foundation pit, multiple pre-embedded parts 1 are directly inserted into the soil layer 6 at the bottom of the foundation pit according to the pre-set structural outline of the main body of the well chamber. Figure 10 As shown, it is worth noting that the insertion depth of the pre-embedded part 1 is not very deep, only enough to ensure that the pre-embedded part 1 can remain upright and fixed in the soil layer 6 at the bottom of the foundation pit. After the pre-embedded part 1 is fixed, concrete is poured in the base arrangement groove to form a concrete foundation layer 7. The pouring height of the concrete foundation layer 7 is below the limiting plate 12. After the concrete foundation layer 7 has solidified, a steel mesh is laid on the steel reinforcement lap unit 14 on the side of the connecting seat 13. Here, the function of the steel reinforcement lap unit 14 is the same as that of the supporting bricks used in the construction of traditional heating network well chambers, which is to support the steel mesh in the reinforced concrete layer 8. The steel reinforcement lap unit 14 can be in various forms, such as the simplest block, to play a role in lapping and fixing. After the steel mesh is lapped, it is fixed by welding to ensure the reliability of the connection of the steel mesh. Figure 1 and Figure 3 As shown, the rebar lap splice unit 14 can also be composed of multiple supporting half-grooves. One end of each supporting half-groove is fixedly connected to the side wall of the connecting seat 13. The supporting half-groove type support structure can position the extended rebars in the rebar mesh and weld the rebars to the supporting half-grooves to ensure the installation accuracy of the rebar mesh. Supporting rebars 5 can also be directly lapped on the supporting half-grooves, with the shape as shown in the figure. Figure 11As shown, a steel mesh is then laid on the support area supported by the supporting steel bars 5, and the supporting steel bars 5 are welded and fixed to the supporting mesh. This can also achieve the purpose of stable installation of the supporting mesh. After the steel mesh is laid out, concrete is poured with the steel mesh as the anchor to form the anchor concrete layer 8. The pouring height of the anchor concrete layer 8 does not exceed the top of the connecting seat 13. At this point, the pre-embedded part 1 has been pre-embedded in the well base and can be used as the connection foundation of the precast steel cage 4.

[0038] The rebar connection 2 is divided into two parts during installation. First, the connecting plate 21 is welded and fixed to one end of multiple extended rebars 3. The multiple extended rebars 3 can be independent rebars or extended rebars pre-reserved during the preparation of the precast rebar cage 4. If it is the former, the other end of the multiple extended rebars 3 needs to be welded and fixed to the bottom of the precast rebar cage 4. The multiple extended rebars 3 and the connecting plate 21 form a connection fulcrum for disassembly and connection with the top of the connecting seat 13. In this embodiment, the connecting plate 21 and the connecting seat 13 are disassembled and connected by bolts. In order to ensure the connection flexibility between the connecting plate 21 and the connecting seat 13, the connection hole of the connecting plate 21 is set as a strip hole. The retaining sleeve 22 on the top of the connecting plate 21 is used to protect the weld point between the extended rebars 3 and the connecting plate 21 to prevent the weld point from being damaged by external interference during transportation. The retaining sleeve 22 is welded to the connecting plate 21 after the extended rebars 3 are welded to the connecting plate 21. The reinforcing ribs 23 on the outside of the retaining sleeve 22 are used to improve the support strength of the retaining sleeve 22. When connecting the connecting plate 21 and the connecting seat 13, some threaded holes and strip holes may have errors in processing, resulting in inaccurate connection. However, at least 2 / 3 of the threaded holes 131 on each node must be fixed with the corresponding strip holes 211 by bolts. It is worth noting that building the steel cage is only the first step in constructing the main structure of the well chamber. Later, the formwork constraint is needed for pouring. Therefore, the connection between the steel cage and the base is only to ensure that the steel cage will not be displaced due to the interference of concrete slurry during subsequent pouring. Therefore, it is not necessary for all connections to be fixed with bolts.

[0039] Specific Implementation Method Two: Combining Figures 1 to 6 To explain this embodiment, the difference between this embodiment and the first specific embodiment is that the connecting seat 13 is a hollow block structure;

[0040] A limiting sleeve 15 is fixedly connected to the upper part of the outer side wall of the connecting seat 13 in a circumferential direction. The top end of the limiting sleeve 15 is set higher than the top end of the connecting seat 13. The limiting sleeve 15 is used to circumferentially limit the connecting plate 21 to improve the docking accuracy between the connecting plate 21 and the connecting seat 13. Other components and connection methods are the same as in the first specific embodiment.

[0041] This embodiment is a further optimization of the structure provided in Specific Embodiment 1. Considering that only the area with the threaded hole 131 machined in the connecting seat 13 serves as the connecting part, the middle part of the connecting seat 13 can be hollowed out in order to reduce the weight and manufacturing cost of the embedded part. The limiting sleeve 15 is welded to the side wall of the connecting seat 13 later. The function of the limiting sleeve 15 is to constrain and limit the connecting plate 21 in the circumferential direction, improve the accuracy of the docking between the connecting plate 21 and the connecting seat 13. At the same time, under the action of the limiting sleeve 15, when the bolt is tightened later, it can also be ensured that there will be no positional deviation between the connecting plate 21 and the connecting seat 13, thus improving the accuracy of bolt tightening.

[0042] Specific implementation method three: Combining Figures 7 to 9 This embodiment describes a connection node used in the construction of a heating network well chamber steel reinforcement structure. The connection node includes a pre-embedded part 1 and a steel reinforcement connection part 2. The pre-embedded part 1 is pre-embedded in the well chamber base, and the steel reinforcement connection part 2 is disposed on the top of the pre-embedded part 1 and is detachably connected to the pre-embedded part 1.

[0043] The pre-embedded part 1 includes a pre-embedded cone 11, which is erected in the concrete foundation layer 7 in the well chamber base. The bottom end of the pre-embedded cone 11 extends to the lower part of the concrete foundation layer 7 and is inserted into the soil layer 6 at the bottom of the foundation pit. The top of the pre-embedded cone 11 is fixedly connected to a limiting plate 12. The top of the limiting plate 12 is fixedly connected to a connecting seat 13. Multiple sets of steel reinforcement lap splice units 14 are fixedly connected to the side wall of the connecting seat 13 along the circumferential direction. The limiting plate 12 and the connecting seat 13 are both located in the rebar-reinforced concrete layer 8 in the well chamber base. The steel reinforcement lap splice unit 14 is used to support and fix the steel mesh in the rebar-reinforced concrete layer 8. The top of the connecting seat 13 is coplanar with the top of the rebar-reinforced concrete layer 8 and is detachably connected to the steel reinforcement connection part 2.

[0044] The embedded cone 11 includes a cross steel fixing plate 111, which is fixed at the center of the bottom of the limiting plate 12. The outside of the cross steel fixing plate 111 is wrapped with a concrete wrapping layer 112, which is a cylinder and has a pointed bottom.

[0045] The connecting seat 13 is a block structure. An extension sleeve 16 is fixed to the top of the connecting seat 13. A set of limiting pin holes 161 are machined on the front and rear sides of the extension sleeve 16. A limiting pin is inserted into each limiting pin hole 161, and the limiting pin is interference-fitted with the limiting pin hole. The steel bar connecting part 2 is inserted into the extension sleeve 16 and is detached from the extension sleeve 16 by the pin.

[0046] The limiting pin hole 161 is a tapered hole. The large end of the limiting pin hole 161 is connected to the outer side wall of the extension sleeve 16, and the small end of the limiting pin hole 161 is connected to the inner side wall of the extension sleeve 16. The pin is a tapered pin that cooperates with the limiting pin hole 161.

[0047] The rebar connection part 2 includes a connecting plate 21, and a retaining sleeve 22 is fixedly connected to the top of the connecting plate 21. The enclosed area of ​​the retaining sleeve 22 is the arrangement area of ​​the extended rebar group 3, and the top of the retaining sleeve 22 is located below the limiting pin hole 161.

[0048] This embodiment provides a connection node structure that differs from that of Specific Embodiment 1. In this embodiment, the embedded part 1 and the rebar connection part 2 are not connected by bolts, but rather fixed by an insert-type limiting method. The main structure of the embedded part 1 is the same as that provided in Specific Embodiment 1. The difference lies in that an extension sleeve 16 is provided on the top of the connecting seat 13 in this embodiment. The extension sleeve 16 is used to accommodate the rebar connection part 2. Due to the different connection structure, the structure of the rebar connection part 2 has also been improved. In this embodiment, the main structure of the rebar connection part 2 still consists of a connecting plate 21 and a retaining sleeve 22. During connection, the connecting plate 21 is first welded and fixed to multiple extended rebars 3, and then the retaining sleeve 22 is welded to the outside of the multiple extended rebars 3 to protect the welding points. In this embodiment, the outer contour of the retaining sleeve 22 is coplanar with the top contour of the connecting plate 21. At the same time, the arrangement height of the retaining sleeve 22 is lower than the arrangement height of the limiting pin hole 161 in the extension sleeve 16. In the design, the design size of the rebar connection part 2 is smaller than the internal size of the extension sleeve 16 to ensure that the rebar connection part 2 can be inserted into the extension sleeve 16. As mentioned above, the connection between the rebar cage and the base is only to ensure that the rebar cage will not shift during subsequent cement pouring. Therefore, high fitting constraints are not required here. The limiting idea of ​​this embodiment is to set the rebar connection part 2 in the extension sleeve 16 and support its bottom through the connecting seat 13. By inserting an interference fit limiting pin into the limiting pin hole 161, the end of the limiting pin extends to the upper part of the retaining sleeve 22 and contacts the retaining sleeve 22. This blocks the upward trend of the retaining sleeve 22 to ensure the stability of the rebar connection part 2 in the extension sleeve 16.

[0049] In addition to the above-mentioned longitudinal constraint limiting method, the rebar connection part 2 can also be fixed by threaded clamping. The structure of the embedded part 1 and the rebar connection part 2 is similar to the structure described above in this embodiment. The difference is that the limiting pin hole 161 is optimized into a threaded hole. At the same time, the top height of the retaining sleeve 22 is not lower than the arrangement height of the threaded hole. During installation, the rebar connection part 2 is inserted into the extension sleeve 16. At this time, the bolt is screwed into the threaded hole and the bolt end is made to make tight contact with the retaining sleeve 22. The clamping force provided by the opposing bolt ensures that the working position of the rebar connection part 2 will not change.

[0050] Compared with the arrangements in Specific Embodiment 1 and Specific Embodiment 2, the arrangement provided in this embodiment has the advantage of not requiring high precision in the fit between the embedded part 1 and the steel bar connection part 2. It is sufficient to ensure that the steel bar connection part 2 can be inserted into the extension sleeve 16. This provides good compensation for processing and assembly errors, making it easier to connect the precast steel cage 4 with the well base and improving construction efficiency.

[0051] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

[0052] Working principle

[0053] The working principle of this application is illustrated below using the technical solution provided in Specific Implementation Method Three as an example:

[0054] First, when constructing the well chamber, it is necessary to excavate the foundation pit in the area, and excavate the base arrangement trench at the top of the foundation pit and the base arrangement trench at the bottom of the foundation pit. After that, multiple pre-embedded parts 1 are directly inserted into the soil layer 6 at the bottom of the foundation pit according to the pre-designed structural outline of the main body of the well chamber. Figure 10As shown, it is worth noting that the insertion depth of the pre-embedded part 1 is not very deep, only enough to ensure that the pre-embedded part 1 can remain upright and fixed in the soil layer 6 at the bottom of the foundation pit. After the pre-embedded part 1 is fixed, concrete is poured in the base arrangement groove to form a concrete foundation layer 7. The pouring height of the concrete foundation layer 7 is below the limiting plate 12. After the concrete foundation layer 7 has solidified, a steel mesh is laid on the steel reinforcement lap unit 14 on the side of the connecting seat 13. After the steel mesh is laid, concrete is poured using the steel mesh as anchor bars to form an anchor concrete layer 8. The pouring height of the anchor concrete layer 8 does not exceed the top of the connecting seat 13. At this point, the pre-embedded part 1 has been pre-embedded in the well chamber base. The connecting plate 21 is welded and fixed to one end of multiple extension steel bars 3, and the other end of the multiple extension steel bars 3 is fixed to the prefabricated steel cage. This process is repeated to set multiple steel bar connection parts 2 at the bottom of the prefabricated steel cage 4. The prefabricated steel cage 4 with multiple steel bar connection parts 2 is hoisted into the foundation pit and adjusted with the assistance of the staff so that each steel bar connection part 2 is inserted into the top of a pre-embedded part 1. The longitudinal limit is set by the limiting pin to ensure the reliability of the insertion of the steel bar connection parts 2. At this point, the prefabricated steel cage 4 has been connected to the well base through the connection node provided in this application. The only subsequent step is to arrange the pouring formwork on the inner and outer sides of the prefabricated steel cage 4 and pour concrete.

Claims

1. A connection node used in the construction of a reinforced concrete structure for a heating network well chamber, characterized in that: The connection node includes a pre-embedded part (1) and a steel bar connection part (2). The pre-embedded part (1) is pre-embedded in the well chamber base, and the steel bar connection part (2) is set on the top of the pre-embedded part (1) and is detachably connected to the pre-embedded part (1). The pre-embedded part (1) includes a pre-embedded cone (11), which is erected in the concrete foundation layer (7) in the well chamber base. The bottom end of the pre-embedded cone (11) extends to the lower part of the concrete foundation layer (7) and is inserted into the soil layer (6) at the bottom of the pit. The top of the pre-embedded cone (11) is fixedly connected to a limiting plate (12). The top of the limiting plate (12) is fixedly connected to a connecting seat (13). Multiple sets of steel reinforcement lap units (14) are fixedly connected to the side wall of the connecting seat (13) along the circumferential direction. The limiting plate (12) and the connecting seat (13) are both located in the rebar concrete layer (8) in the well chamber base. The steel reinforcement lap unit (14) is used to support and fix the steel mesh in the rebar concrete layer (8). The top of the connecting seat (13) is coplanar with the top of the rebar concrete layer (8) and is detached and connected to the steel reinforcement connection part (2).

2. The connection node used in the construction of the steel reinforcement structure of a heating network well chamber according to claim 1, characterized in that: The embedded cone (11) includes a cross steel fixing plate (111), which is fixed at the center of the bottom of the limiting plate (12). The outside of the cross steel fixing plate (111) is wrapped with a concrete wrapping layer (112). The concrete wrapping layer (112) is a cylinder, and the bottom end of the concrete wrapping layer (112) is set as a pointed tip.

3. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 2, characterized in that: The connecting seat (13) is a block structure. Multiple connecting threaded holes (131) are machined at equal intervals along the circumference at the edge of the top of the connecting seat (13). The connecting seat (13) and the steel bar connection part (2) are connected and disassembled by multiple connecting bolts.

4. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 3, characterized in that: The connecting seat (13) is a hollow block structure.

5. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 2 or 3, characterized in that: The rebar connection part (2) includes a connecting plate (21). Multiple connecting strip holes (211) are machined at equal intervals along the circumference at the top edge of the connecting plate (21). Each connecting strip hole (211) is matched with a connecting threaded hole (131). A retaining sleeve (22) is fixedly connected at the top center of the connecting plate (21). The area enclosed by the retaining sleeve (22) is the arrangement area of ​​the extended rebar group (3).

6. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 5, characterized in that: The outer side of the retaining sleeve (22) is provided with multiple reinforcing ribs (23) along the circumferential direction. The side of each reinforcing rib (23) is fixedly connected to the retaining sleeve (22), and the bottom of each reinforcing rib (23) is fixedly connected to the top of the connecting plate (21).

7. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 5 or 6, characterized in that: A limiting sleeve (15) is fixedly attached to the upper part of the outer side wall of the connecting seat (13) along the circumferential direction. The top of the limiting sleeve (15) is set higher than the top of the connecting seat (13). The limiting sleeve (15) is used to circumferentially limit the connecting plate (21) to improve the docking accuracy between the connecting plate (21) and the connecting seat (13).

8. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 2, characterized in that: The connecting seat (13) is a block structure. An extension sleeve (16) is fixed to the top of the connecting seat (13). A set of limiting pin holes (161) are machined on the front and rear sides of the extension sleeve (16). A limiting pin is inserted into each limiting pin hole (161), and the limiting pin is interference-fitted with the limiting pin hole. The steel bar connecting part (2) is inserted into the extension sleeve (16) and is detached from the extension sleeve (16) by the pin.

9. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 8, characterized in that: The limiting pin hole (161) is a tapered hole. The large end of the limiting pin hole (161) is connected to the outer side wall of the extension sleeve (16), and the small end of the limiting pin hole (161) is connected to the inner side wall of the extension sleeve (16). The pin is a tapered pin that cooperates with the limiting pin hole (161).

10. The connection node used in the construction of a heating network well chamber steel reinforcement structure according to claim 8 or 9, characterized in that: The steel bar connection part (2) includes a connecting plate (21), and a retaining sleeve (22) is fixedly connected to the top of the connecting plate (21). The enclosed area of ​​the retaining sleeve (22) is the arrangement area of ​​the extended steel bar group (3), and the top of the retaining sleeve (22) is located below the limiting pin hole (161).

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