Method for connecting a round pipe section to a comprehensive pipe gallery

Abstract

This invention relates to a method for connecting circular jacking pipe sections to integrated utility tunnels. The method involves pre-embedding connecting sleeves, internal embedded parts, and external embedded parts on the end faces of the jacking pipe sections, and pre-embedding bottom plate parts in the construction shaft bottom slab. After the jacking pipe section is jacked into place, the external embedded parts are welded and fixed to the bottom plate embedded parts. During the construction of the integrated utility tunnel, its main reinforcement is threaded to the connecting sleeve, and internal and external embedded parts are pre-embedded in the tunnel and at the tunnel ends. A water-swellable sealing adhesive layer is applied between the end faces. After the integrated utility tunnel is poured, sealant is filled into the circumferential gap between the internal and external embedded parts of the tunnel and the pipe section, and then a ring-shaped waterproof steel plate is welded across the gap. The external embedded parts at the tunnel ends are then circumferentially welded to the external embedded parts of the pipe section. Finally, plain concrete is used to fill the gap. This invention, through its multi-layered waterproofing and structural integration design, completely solves the problems of high leakage risk, difficult construction, and poor structural integrity at the connection points.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering construction technology, and more specifically, to a method for connecting a circular jacking pipe section to a comprehensive utility tunnel. Background Technology

[0002] In the construction of urban underground utility tunnels, to minimize disruption to surface traffic and the environment, trenchless circular pipe jacking is often used when crossing key nodes, while the connecting conventional sections utilize open-cut cast-in-place construction. At the interface between the circular pipe jacking section and the cast-in-place utility tunnel, i.e., the launching or receiving shaft location, the connection point is highly susceptible to leakage and structural damage. Existing connection methods generally suffer from the following problems: high construction difficulty and inconvenience; high leakage risk; high construction cost, long construction time, and unreliable results. Therefore, there is an urgent need for a connection method that can reduce construction difficulty, eliminate leakage risks, achieve structural integration, and is economical and efficient. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for connecting a circular jacking pipe section to an integrated utility tunnel, which aims to solve the problems existing in the prior art.

[0004] According to the present invention, a method for connecting a circular pipe jacking section to a comprehensive utility tunnel is provided, which is used to connect a circular pipe jacking section to a cast-in-place open-cut comprehensive utility tunnel at the construction shaft, and includes the following steps: Step 1: When pouring the bottom slab of the construction well, embed the bottom slab pre-embedded parts at the designated locations; Step 2: When prefabricating the jacking pipe section, multiple connecting sleeves are pre-embedded circumferentially on the end face of the jacking pipe section to be used for connection. External pre-embedded parts are pre-embedded at the outer end of the jacking pipe section, and internal pre-embedded parts are pre-embedded at the inner end of the jacking pipe section. Step 3: Push the jacking pipe section into place so that the end of the jacking pipe section extends into the construction well; Step 4: Inside the construction well, fix the external embedded parts of the pipe section to the embedded parts of the base plate using connectors; Step 5: Construct the integrated utility tunnel by threading the ends of the main reinforcing bars of its internal steel reinforcement skeleton to the connecting sleeves on the end face of the jacking pipe section; pre-embed pre-parts in the integrated utility tunnel at the connection end, and set at least one annular water-swellable sealing adhesive layer between this end and the end face of the jacking pipe section; pre-embed pre-parts on the outer edge of the end of the integrated utility tunnel; and then pour the concrete of the integrated utility tunnel. Step 6: Fill the circumferential gap between the embedded parts in the pipe section and the embedded parts in the pipe gallery with sealant; Step 7: Weld an annular waterproof steel plate to the inner side of the embedded parts in the pipe section and the pipe gallery. The annular waterproof steel plate covers the circumferential gap and the sealant, and is fully welded to the embedded parts in the pipe section and the pipe gallery respectively. At the same time, weld the outer embedded part at the end of the pipe gallery to the outer embedded part of the pipe section along the circumferential direction. Step 8: Fill the gap between the integrated utility tunnel and the bottom slab of the construction well with plain concrete to complete the connection.

[0005] Preferably, the connecting sleeve is a straight thread sleeve or a tapered thread sleeve, and has two rings, inner and outer, arranged circumferentially along the end face of the jacking pipe section; the main reinforcement bars of the steel reinforcement cage of the integrated pipe gallery are correspondingly arranged as inner and outer rings, and are screwed into the connecting sleeves of the inner and outer rings one by one.

[0006] Preferably, both the embedded part inside the pipe section and the embedded part outside the pipe section are annular cylindrical components. The embedded part inside the pipe section and the embedded part outside the pipe section are respectively attached and fixed to the inner wall and outer wall of the jacking pipe section, and their end faces are flush with the end face of the jacking pipe section.

[0007] Preferably, the embedded part in the pipe gallery is an annular cylindrical component adapted to the embedded part in the pipe section, and its embedded rear end face is flush with the end face of the connection end of the integrated pipe gallery; the embedded part at the end of the pipe gallery is an annular plate-shaped component, the inner diameter of which is less than or equal to the outer diameter of the jacking pipe section, and the outer diameter of which matches the outer diameter of the integrated pipe gallery, and the plate surface of the embedded part at the end of the pipe gallery is flush with the end face of the connection end of the integrated pipe gallery.

[0008] Preferably, in step four, the connecting member is a vertically arranged connecting steel plate, the upper end of which is welded and fixed to the outer wall of the pre-embedded part of the pipe section, and the lower end is welded and fixed to the pre-embedded part of the bottom plate embedded in the bottom plate of the construction well.

[0009] Preferably, in step five, the water-swellable sealant layer consists of two concentric layers arranged at intervals. After the concrete of the integrated pipe gallery is poured, the water-swellable sealant layer is pressed tightly against the end face of the jacking pipe section and the end face of the integrated pipe gallery.

[0010] Preferably, in step seven, the annular waterproof steel plate is an annular cylindrical component, and the outer diameter of the annular waterproof steel plate matches the inner diameter of the embedded part in the pipe section and the embedded part in the pipe gallery; after welding, the annular waterproof steel plate spans the circumferential gap, and its two ends are continuously and fully welded to the inner surfaces of the embedded part in the pipe section and the embedded part in the pipe gallery, respectively.

[0011] Preferably, in step five, after the integrated pipe gallery is cast in place, its inner diameter is consistent with the inner diameter of the jacking pipe section, and the inner hole of the connecting end of the integrated pipe gallery is a circular cross-section that matches the inner hole of the jacking pipe section.

[0012] Preferably, in step eight, the plain concrete used for filling is C20 plain concrete, which fills the gap between the outer bottom surface of the integrated utility tunnel and the bottom slab of the construction well, forming a smooth transition support foundation.

[0013] Preferably, the construction well is a launching well or a receiving well; when it is a launching well, the pipe section used for connection is an end pipe section; when it is a receiving well, the pipe section used for connection is a beginning pipe section.

[0014] The connection method between circular jacking pipe sections and integrated utility tunnels provided by this invention completely reconstructs the connection form between circular jacking pipe sections and cast-in-place integrated utility tunnels through systematic pre-embedded component design and multiple internal and external connections and waterproofing processes. In terms of structural integration, the mechanical connection between the main reinforcement and the connecting sleeve, the full-welded bridging of the internal waterproof steel plate, and the circumferential welding of the external pre-embedded components create a robust structural whole between the jacking pipe section and the integrated utility tunnel, with continuous reinforcing steel and coordinated internal and external steel frames, fundamentally solving the cracking risks caused by uneven settlement. Regarding waterproofing reliability, a four-layer complementary waterproofing system is constructed, consisting of "end-face water-swellable sealing adhesive, circumferential gap sealant, internal full-welded waterproof steel plate, and external circumferential weld," perfectly combining flexible adaptive waterproofing with rigid cut-off waterproofing to achieve the engineering goal of zero leakage. In terms of construction convenience and economy, most of the high-precision operations are transformed into prefabrication on the ground and pre-embedding procedures in open-cut construction. Underground operations are simplified to several clear steps such as screwing in steel bars, applying adhesive and welding, which significantly reduces the difficulty of construction in narrow spaces and the reliance on highly skilled workers, greatly shortens the construction period, and has outstanding overall cost advantages. Attached Figure Description

[0015] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

[0016] Figure 1 A schematic plan view of the starting section of the pipe jacking well according to an embodiment of the present invention is shown.

[0017] Figure 2 A schematic diagram of the vertical cross-section of the jacking well section according to an embodiment of the present invention is shown.

[0018] Figure 3 A schematic diagram of the connection structure between the jacking pipe section and the cast-in-place integrated pipe gallery in the jacking starting shaft according to an embodiment of the present invention is shown.

[0019] In the diagram: 1. Embedded part in the base plate; 2. Connecting sleeve; 3. Embedded part outside the pipe section; 4. Embedded part inside the pipe section; 5. Water-swellable sealing adhesive layer; 6. Embedded part inside the pipe gallery; 7. Embedded part outside the pipe gallery end; 8. Sealant; 9. Annular waterproof steel plate; 10. Connecting steel plate. Detailed Implementation

[0020] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0021] This invention provides a method for connecting circular pipe jacking sections to a comprehensive utility tunnel, used to connect circular pipe jacking sections to an open-cut, cast-in-place comprehensive utility tunnel at a construction shaft. The construction shaft is either a launching shaft or a receiving shaft; when it is a launching shaft, the pipe jacking section used for connection is the end pipe jacking section; when it is a receiving shaft, the pipe jacking section used for connection is the beginning pipe jacking section. See also... Figures 1 to 3 The following section uses the connection construction at the starting shaft of a circular pipe jacking section in a certain integrated utility tunnel project as an example to describe the invention in detail. The connection method between the circular pipe jacking section and the integrated utility tunnel includes the following steps: Step 1: When pouring the bottom slab of the construction well, embed the bottom slab pre-embedded part 1 at the designated location.

[0022] Specifically, the construction shaft is a rectangular vertical shaft, constructed using the open-cut method. After the reinforcement of the construction shaft's bottom slab is tied and before concrete pouring, the positioning and fixing of the bottom slab embedded part 1 is carried out. According to the design, after the jacking pipe section extends into the starting shaft, its axis coincides with the design axis of the connection end of the integrated utility tunnel (the connection end is the end facing the jacking pipe section, and the connection end is a gradually changing section from square to round). The bottom slab embedded part 1 can be a rectangular steel plate or an angular steel plate, with several J-shaped anchor bars welded to its back, anchored into the bottom slab concrete.

[0023] Step 2: When prefabricating the jacking pipe section, multiple connecting sleeves 2 are pre-embedded circumferentially on the end face of the jacking pipe section to be used for connection. External pre-embedded parts 3 are pre-embedded at the outer end of the jacking pipe section, and internal pre-embedded parts 4 are pre-embedded at the inner end of the jacking pipe section.

[0024] Specifically, in the prefabricated steel mold of the pipe jacking section prefabrication plant, embedded parts are installed for the special pipe jacking section intended for connection. This includes: precisely drilling holes in the end face template of the pipe jacking section for fixing the connecting sleeve 2, the embedded part 4 inside the pipe section, and the embedded part 3 outside the pipe section.

[0025] The connecting sleeve 2 is a straight threaded sleeve or a tapered threaded sleeve of the same specification as the main reinforcement of the jacking pipe section, with two rings, inner and outer, evenly arranged around the end face of the jacking pipe section. The axis of the connecting sleeve 2 is parallel to the axis of the jacking pipe section. The inner end of the connecting sleeve 2 is connected to the main reinforcement of the jacking pipe section, and its outer open end is tightly attached to the end face template and sealed to prevent concrete from entering.

[0026] The embedded part 4 inside the pipe section is an annular cylindrical steel component with the same inner diameter as the inner diameter of the jacking pipe section, which fits tightly against the inner mold. One end of the embedded part 4 inside the pipe section is flush with the end face of the jacking pipe section, and the other end extends into the concrete pouring space. Several J-shaped anchor bars are welded around the embedded part 4 inside the pipe section to enhance the anchoring.

[0027] The external embedded part 3 of the pipe section is also a ring-shaped cylindrical steel component with the same outer diameter as the outer diameter of the jacking pipe section, and it fits tightly against the inner wall of the outer formwork. One end of the external embedded part 3 is flush with the end face of the jacking pipe section, and the other end extends into the concrete pouring space. Several anchor bars are also welded around the circumference of the external embedded part 3 to enhance the anchoring.

[0028] After all embedded parts are installed and inspected, the concrete for the jacking pipe section is poured and cured. After demolding, check the threads of the connecting sleeve 2 for integrity, apply grease, and screw on the plastic protective cap; apply anti-rust paint to the exposed metal embedded parts. After the jacking pipe section is prefabricated, the embedded parts 4 inside the pipe section and the embedded parts 3 outside the pipe section are respectively attached and fixed to the inner and outer walls of the jacking pipe section, and their end faces are flush with the end face of the jacking pipe section. This special jacking pipe section will be used as the first section (at the receiving well) or the last section (at the launching well) of the jacking pipe section for connection.

[0029] Step 3: Push the jacking pipe section into place, so that the end of the jacking pipe section extends into the construction shaft. Specifically, the pipe jacking machine starts from the launching shaft. After completing the entire jacking section, the first dedicated pipe jacking section is jacked into the receiving shaft. On the launching shaft side, the last pipe jacking section is pushed to the designed position, so that its end extends into the launching shaft by a predetermined length, forming space for subsequent operations. At this time, the connecting sleeve 2 at the end of the pipe jacking section is located in the construction shaft, and the external embedded part 3 and the internal embedded part 4 of the pipe section are at least partially located in the construction shaft.

[0030] Step 4: Inside the construction well, the external embedded part 3 of the pipe section is fixedly connected to the embedded part 1 of the bottom plate through a connector.

[0031] Specifically, the connector is a vertically arranged connecting steel plate 10. The upper end of the connecting steel plate 10 matches the arc-shaped groove structure of the outer embedded part 3 of the pipe section. Its upper end is tightly fitted to the bottom outer wall of the outer embedded part 3 of the pipe section and welded with fillet weld. Its lower end is fully welded to the outer surface of the bottom plate embedded part 1 for fixation. This step provides a solid vertical support for the end of the cantilevered jacking pipe section and accurately fixes it at the design elevation to prevent displacement during subsequent pouring and settlement.

[0032] Step 5: Construct the integrated utility tunnel by threading the ends of the main reinforcing bars of its internal steel reinforcement skeleton to the connecting sleeves 2 on the end face of the jacking pipe section; pre-embed the embedded parts 6 in the integrated utility tunnel at the connection end, and set at least one annular water-swellable sealing adhesive layer 5 between the end and the end face of the jacking pipe section; pre-embed the external embedded parts 7 at the outer edge of the end of the integrated utility tunnel; and then pour the concrete of the integrated utility tunnel.

[0033] Specifically, in the construction well ( Figure 3 Inside the starting shaft, the steel reinforcement framework for the integrated utility tunnel begins to be tied. The connecting end of the integrated utility tunnel is a transition section that changes from rectangular to circular, with its end face being a straight surface that mates with the jacking pipe section. After the integrated utility tunnel is cast in place, its inner diameter is consistent with the inner diameter of the jacking pipe section, and the inner hole of the connecting end of the integrated utility tunnel has a circular cross-section that matches the inner hole of the jacking pipe section.

[0034] First, the ends of the main reinforcing bars of the integrated utility tunnel's steel reinforcement cage are machined with external threads that match the connecting sleeves 2. The main reinforcing bars of the integrated utility tunnel's steel reinforcement cage are correspondingly arranged in inner and outer rings, and each is screwed into the inner and outer rings of the connecting sleeves 2 pre-embedded on the end face of the jacking pipe section, and tightened to the specified torque using a wrench. This operation connects the load-bearing steel bars of the integrated utility tunnel with the internal steel reinforcement cage of the jacking pipe section, forming a continuous load-bearing system that runs through the joint.

[0035] Subsequently, the stirrups and tie bars of the integrated utility tunnel's steel reinforcement cage are tied to complete the overall steel reinforcement cage binding. At the ends of the steel reinforcement cage, the embedded parts 6 inside the utility tunnel and the embedded parts 7 outside the utility tunnel ends are also precisely fixed. The embedded part 6 inside the utility tunnel is an annular cylindrical component that matches the embedded part 4 inside the pipe section. The material and dimensions of the embedded part 6 inside the utility tunnel are exactly the same as those of the embedded part 4 inside the pipe section. Its rear end face after pre-installation is flush with the end face of the connection end of the integrated utility tunnel (flush with the end template) and forms a circumferential gap with the end face of the embedded part 4 inside the pipe section. The embedded part 6 inside the pipe gallery is an annular cylindrical component adapted to the embedded part 4 inside the pipe section, and its embedded rear end face is flush with the end face of the connection end of the integrated pipe gallery; the embedded part 7 at the end of the pipe gallery is an annular plate-shaped component, the inner diameter of which is less than or equal to the outer diameter of the jacking pipe section, and the outer diameter of which matches the outer diameter of the integrated pipe gallery. The plate surface of the embedded part 7 at the end of the pipe gallery is flush with the end face of the connection end of the integrated pipe gallery and faces the end face of the embedded part 3 outside the pipe section, forming another outer annular butt joint. Several J-shaped anchor bars are also welded to the side of the embedded part 6 inside the pipe gallery and the embedded part 7 at the end of the pipe gallery facing the concrete pouring space to enhance the anchorage.

[0036] Before formwork assembly, two concentric ring-shaped water-swellable sealant layers 5 must be applied radially at intervals on the end face of the jacking pipe section. After all the above procedures are completed and passed inspection, the formwork for the integrated utility tunnel is erected, and the integrated utility tunnel concrete is poured. After the concrete for the integrated utility tunnel is poured, the water-swellable sealant layer 5 is pressed tightly against the end face of the jacking pipe section and the end face of the integrated utility tunnel. During the pouring process, an attached vibrator is used to assist in vibration to ensure a tight bond between the old and new concrete at the ends and that there are no voids behind any embedded parts. The formwork is then removed after curing to the design strength.

[0037] Step 6: Fill the circumferential gap between the embedded part 4 in the pipe section and the embedded part 6 in the pipe gallery with sealant 8.

[0038] Specifically, workers enter the integrated utility tunnel to treat the circumferential gaps. First, they use a wire brush and high-pressure air to clean the loose debris and dust from the inner walls of the gaps. Then, using a caulking gun, they inject two-component polysulfide sealant 8 into the circumferential gaps to fill them, and use a scraper to compact and smooth it, ensuring a smooth transition with the inner walls of the embedded parts 4 in the pipe sections on both sides and the embedded parts 6 in the utility tunnel. The sealant 8 forms a flexible waterproof barrier.

[0039] Step 7: Weld an annular waterproof steel plate 9 to the inner side of the embedded part 4 in the pipe section and the embedded part 6 in the pipe gallery. The annular waterproof steel plate 9 covers the circumferential gap and the sealant 8, and is fully welded to the embedded part 4 in the pipe section and the embedded part 6 in the pipe gallery respectively. At the same time, weld the embedded part 7 at the end of the pipe gallery to the embedded part 3 in the pipe section along the circumferential direction.

[0040] Specifically, the annular waterproof steel plate 9 is an annular cylindrical component, and the outer diameter of the annular waterproof steel plate 9 matches the inner diameter of the embedded part 4 in the pipe section and the embedded part 6 in the pipe gallery; after welding, the annular waterproof steel plate 9 spans the circumferential gap, and its two ends are continuously and fully welded to the inner surfaces of the embedded part 4 in the pipe section and the embedded part 6 in the pipe gallery, respectively.

[0041] In practice, a ring-shaped waterproof steel plate 9 is pre-rolled and welded from steel plates of a certain thickness in the factory. Its length precisely covers the entire circumferential gap and the embedded parts area on both sides within a certain length range. The entire ring-shaped waterproof steel plate 9 is placed centered inside the circumferential gap, with its two ends respectively adhering to the inner surfaces of the embedded parts 4 in the pipe section and the embedded parts 6 in the pipe gallery. First, circumferential spot welding is performed for fixation, followed by continuous and uninterrupted full welding. Two complete circumferential fillet welds firmly connect the ring-shaped waterproof steel plate 9 to the structures on both sides, forming a rigid barrier that will never leak, and protecting the internal sealant 8 and waterproof sealant from external damage.

[0042] Meanwhile, on the outside of the integrated utility tunnel, the joint between the external embedded part 7 at the end of the tunnel and the external embedded part 3 of the pipe section is fully welded in a circumferential direction to form a circumferential weld. This circumferential weld not only provides an outer rigid waterproof layer, but more importantly, it firmly connects the outer wall of the jacking pipe section to the outer wall of the integrated utility tunnel, forming a strong connection frame with the internal annular waterproof steel plate 9, which works in conjunction with the outer wall and has multiple closures.

[0043] Step 8: Fill the gap between the integrated utility tunnel and the bottom slab of the construction well with plain concrete to complete the connection.

[0044] Specifically, after the completion of the integrated utility tunnel pouring and the welding structure construction of the connection nodes between the integrated utility tunnel and the jacking pipe section, a simple formwork was erected in the gap between the outer bottom of the integrated utility tunnel and the bottom plate of the construction shaft, and C20 plain concrete was poured. This filling layer completely filled the gap and wrapped the lower half of the circumferential weld at the connection between the connecting steel plate 10, the bottom plate embedded part 1, and the external embedded part 7 at the end of the utility tunnel and the external embedded part 3 of the pipe section. On the one hand, it provides uniform and dense bottom support for the integrated utility tunnel, reducing the concentrated pressure on the lower structure; on the other hand, it forms permanent anti-corrosion protection for the bottom connection weld and metal components, and makes the inner and outer surfaces of the entire connection area smoothly transition and neatly designed. At this point, the entire connection construction between the circular jacking pipe section and the integrated utility tunnel is completed.

[0045] In summary, the connection method between the circular jacking pipe section and the integrated utility tunnel provided by this invention, through systematic pre-embedded component design and multiple internal and external connections and waterproofing processes, completely reconstructs the connection form between the circular jacking pipe section and the cast-in-place integrated utility tunnel. Regarding structural integration, through the mechanical connection of the main reinforcement and the connecting sleeve, the full welding bridging of the internal waterproof steel plate, and the circumferential welding of the external pre-embedded components, the jacking pipe section and the integrated utility tunnel form a robust structural whole with continuous reinforcing steel and coordinated internal and external steel frames, fundamentally solving the cracking risks caused by uneven settlement. In terms of waterproofing reliability, a four-layer complementary waterproofing system is constructed, consisting of "end-face water-swellable sealing adhesive, circumferential gap sealant, internal full-welded waterproof steel plate, and external circumferential weld," perfectly combining flexible adaptive waterproofing with rigid cut-off waterproofing to achieve the engineering goal of zero leakage. In terms of construction convenience and economy, most of the high-precision operations are transformed into prefabrication on the ground and pre-embedding procedures in open-cut construction. Underground operations are simplified to several clear steps such as screwing in steel bars, applying adhesive and welding, which significantly reduces the difficulty of construction in narrow spaces and the reliance on highly skilled workers, greatly shortens the construction period, and has outstanding overall cost advantages.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for connecting a circular pipe jacking section to a comprehensive utility tunnel, used to connect a circular pipe jacking section to a cast-in-place open-cut comprehensive utility tunnel at the construction shaft, characterized in that... Includes the following steps: Step 1: When pouring the bottom slab of the construction well, embed the bottom slab pre-embedded parts at the designated locations; Step 2: When prefabricating the jacking pipe section, multiple connecting sleeves are pre-embedded circumferentially on the end face of the jacking pipe section to be used for connection. External pre-embedded parts are pre-embedded at the outer end of the jacking pipe section, and internal pre-embedded parts are pre-embedded at the inner end of the jacking pipe section. Step 3: Push the jacking pipe section into place so that the end of the jacking pipe section extends into the construction well; Step 4: Inside the construction well, fix the external embedded parts of the pipe section to the embedded parts of the base plate using connectors; Step 5: Construct the integrated utility tunnel by threading the ends of the main reinforcing bars of its internal steel reinforcement skeleton to the connecting sleeves on the end face of the jacking pipe section; pre-embed pre-parts in the integrated utility tunnel at the connection end, and set at least one annular water-swellable sealing adhesive layer between this end and the end face of the jacking pipe section; pre-embed pre-parts on the outer edge of the end of the integrated utility tunnel; and then pour the concrete of the integrated utility tunnel. Step 6: Fill the circumferential gap between the embedded parts in the pipe section and the embedded parts in the pipe gallery with sealant; Step 7: Weld an annular waterproof steel plate to the inner side of the embedded parts in the pipe section and the pipe gallery. The annular waterproof steel plate covers the circumferential gap and the sealant, and is fully welded to the embedded parts in the pipe section and the pipe gallery respectively. At the same time, weld the outer embedded part at the end of the pipe gallery to the outer embedded part of the pipe section along the circumferential direction. Step 8: Fill the gap between the integrated utility tunnel and the bottom slab of the construction well with plain concrete to complete the connection.

2. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, The connecting sleeve is a straight threaded sleeve or a tapered threaded sleeve, and has two rings, inner and outer, arranged circumferentially along the end face of the jacking pipe section; the main reinforcement of the steel reinforcement skeleton of the integrated pipe gallery is correspondingly arranged as inner and outer rings, and is screwed into the connecting sleeves of the inner and outer rings one by one.

3. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, Both the internal and external embedded parts of the pipe section are annular cylindrical components. The internal and external embedded parts are respectively attached and fixed to the inner and outer walls of the jacking pipe section, and their end faces are flush with the end face of the jacking pipe section.

4. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 3, characterized in that, The embedded part inside the pipe gallery is an annular cylindrical component adapted to the embedded part inside the pipe section, and its embedded rear end face is flush with the end face of the connection end of the integrated pipe gallery; the embedded part at the end of the pipe gallery is an annular plate-shaped component, the inner diameter of which is less than or equal to the outer diameter of the jacking pipe section, and the outer diameter of which matches the outer diameter of the integrated pipe gallery, and the plate surface of the embedded part at the end of the pipe gallery is flush with the end face of the connection end of the integrated pipe gallery.

5. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, In step four, the connector is a vertically arranged connecting steel plate. The upper end of the connecting steel plate is welded and fixed to the outer wall of the pre-embedded part of the pipe section, and the lower end is welded and fixed to the pre-embedded part of the bottom plate embedded in the bottom plate of the construction well.

6. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, In step five, the water-swellable sealing adhesive layer consists of two concentric layers spaced apart. After the concrete of the integrated pipe gallery is poured, the water-swellable sealing adhesive layer is pressed tightly against the end face of the jacking pipe section and the end face of the integrated pipe gallery.

7. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 3, characterized in that, In step seven, the annular waterproof steel plate is an annular cylindrical component, and the outer diameter of the annular waterproof steel plate matches the inner diameter of the embedded part in the pipe section and the embedded part in the pipe gallery. After welding, the annular waterproof steel plate spans the circumferential gap, and its two ends are continuously and fully welded to the inner surfaces of the embedded parts in the pipe section and the embedded parts in the pipe gallery, respectively.

8. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, In step five, after the integrated pipe gallery is cast in place, its inner diameter is consistent with the inner diameter of the jacking pipe section, and the inner hole of the connecting end of the integrated pipe gallery is a circular cross-section that matches the inner hole of the jacking pipe section.

9. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, In step eight, the plain concrete used for filling is C20 plain concrete. The plain concrete fills the gap between the outer bottom surface of the integrated utility tunnel and the bottom plate of the construction well, forming a smooth transition support foundation.

10. The method for connecting a circular jacking pipe section to a comprehensive utility tunnel according to claim 1, characterized in that, The construction well is either a launching well or a receiving well; when it is a launching well, the pipe section used for connection is the end pipe section; when it is a receiving well, the pipe section used for connection is the beginning pipe section.

Images