Construction method of non-reverse excavation type outlet pipeline for cast-in-place pipe gallery

Abstract

The application discloses a construction method of a non-reverse excavation type outlet pipeline of a cast-in-place pipe gallery, in the process of the construction of the comprehensive pipe gallery, the construction of the transverse connecting channel is simultaneously performed, and the prefabricated well section is installed in the connecting channel to form the outlet well, and the comprehensive pipe gallery, the connecting channel and the outlet well form the through outlet channel, so that compared with the prior art, the main structure of the pipe gallery is not damaged, the service life of the main body of the pipe gallery can be prolonged, meanwhile, the waterproof structure is arranged at each connecting position of the outlet well, the risk of leakage can be further reduced, and the construction period and the construction cost can be greatly reduced compared with the prior art.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a construction method for non-reverse excavation outgoing pipelines for cast-in-place pipe galleries. Background Technology

[0002] Currently, in municipal engineering projects, the outgoing pipelines of utility tunnels mostly adopt the reverse excavation method. This involves excavating the outer ground to the side wall of the utility tunnel after the main structure is poured, then chiseling out pre-reserved holes in the main structure to lead out the pipelines, and finally backfilling and sealing with concrete. The outgoing pipelines lack dedicated channels, and the reverse excavation construction damages the main structure and waterproofing layer of the utility tunnel, resulting in high risks of leakage, long construction periods, and high costs.

[0003] Therefore, it is necessary to improve the existing utility tunnel outlet structure and construction methods to avoid damage to the main structure and waterproof layer of the utility tunnel, and to provide dedicated outlet channels for pipelines to extend the service life of the utility tunnel. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a construction method for non-reverse excavation outgoing pipelines for cast-in-place pipe racks, which can avoid damage to the main structure and waterproof layer of the pipe rack, and the pipeline has a dedicated outgoing channel to extend the service life of the main structure of the pipe rack.

[0005] The present invention provides a construction method for trenchless outgoing pipelines in cast-in-place pipe galleries, comprising the following steps:

[0006] S1: According to the design requirements, several prefabricated well sections are manufactured, and each prefabricated well section has a connecting structure at both ends;

[0007] S2: During the construction of the integrated utility tunnel, at the location of the pre-set outgoing pipeline, the construction of the connecting channel is carried out simultaneously along the transverse direction of the integrated utility tunnel, so that the connecting channel is connected to the integrated utility tunnel, and an installation seat is provided at the top of the connecting channel.

[0008] S3: Install one of the prefabricated well segments made in step S1 onto the top of the mounting base through a connecting structure, and install the bottom of the next prefabricated well segment onto the top of the previous prefabricated well segment through a connecting structure, thereby completing the installation of all prefabricated well segments in sequence to form an outlet well, so that the outlet well is connected to the connecting channel.

[0009] S4: Waterproof structures are provided around the connection points between several prefabricated well sections and the connection points between the prefabricated well sections and the mounting base in step S3.

[0010] S5: Install the conduit in the outlet well according to the design requirements.

[0011] Furthermore, in step S3, the integrated utility tunnel, connecting passage, and outgoing well are sequentially connected to form a continuous outgoing passage.

[0012] Furthermore, in step S1, the prefabricated well section is manufactured in the factory. The prefabricated well section is a hollow structure with openings at both ends. The prefabricated well section includes several prefabricated well sections I and several prefabricated well sections II. The prefabricated well sections I and II are arranged at intervals along the outgoing line direction, and one prefabricated well section I is installed on the top of the mounting base.

[0013] Furthermore, the lower end of the prefabricated well section I is provided with a connecting ring protrusion, the upper end of the prefabricated well section I is provided with a mortise joint, the lower end of the prefabricated well section II is provided with a tenon head that mates with the mortise joint, and the upper end of the prefabricated well section II is provided with a connecting ring groove that mates with the connecting ring protrusion.

[0014] Furthermore, an annular water-stop strip is provided inside the connecting ring groove.

[0015] Furthermore, in step S4, the waterproof structure includes a waterproof layer and a concrete layer. The waterproof layer is disposed on the outer periphery of the connection between adjacent precast well sections, and the concrete layer is disposed on the outer periphery of the waterproof layer.

[0016] Furthermore, step S4 also includes a seepage collection component, which includes an annular collection trough and a collection pipe connected to the annular collection trough. The annular collection trough is fixedly installed on the lower part of the inner side wall of the mounting base and is used to collect seepage water flowing down the inner side wall of the outlet well. The collection pipe is used to guide the seepage water collected in the annular collection trough to the water collection ditch of the integrated pipe gallery.

[0017] Furthermore, the prefabricated well section I is provided with a grouting port, which is located near the connecting annular protrusion.

[0018] Furthermore, an inclined ladder is installed inside the outlet well.

[0019] Furthermore, the mounting base is provided with a mounting ring groove that mates with the connecting ring protrusion of the prefabricated well section I.

[0020] The beneficial effects of this invention are as follows: The construction method of the non-reverse excavation outlet pipeline for cast-in-place pipe corridors of this invention allows for the simultaneous construction of connecting pipelines during the construction of the integrated pipe corridor. Therefore, when an outlet is required, the pipeline can be led out through an outlet well. Compared to existing methods, this avoids damage to the main structure and waterproof layer of the pipe corridor, extending the service life of the main structure. Furthermore, the waterproof structure at the outlet well further reduces the risk of leakage, significantly reduces earthwork volume, and substantially lowers the overall cost of earthwork excavation, transportation, and backfilling, effectively shortening the construction cycle. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a flowchart illustrating the construction process of the present invention.

[0023] Figure 2 A structural schematic diagram of the integrated utility tunnel, connecting passages, and outlet shafts;

[0024] Figure 3 This is a structural schematic diagram of the connection point of the prefabricated well sections;

[0025] Figure 4 for Figure 3 A sectional view;

[0026] Figure 5 This is a structural diagram of the tenon head and the mortise joint;

[0027] Figure 6 This is a cross-sectional view of the grouting port of the precast well section;

[0028] Figure 7 This is a magnified view of point A;

[0029] Figure 8 This is a magnified view of point B.

[0030] Figure label:

[0031] 1. Integrated utility tunnel; 2. Connecting passage; 201. Mounting base; 3. Precast well section; 301. Precast well section I; 302. Precast well section II; 303. Connecting ring protrusion; 304. Connecting ring groove; 305. Waterstop strip; 306. Grouting port; 307. Mortise joint; 308. Tenon head; 4. Concrete layer; 5. Waterproof layer; 6. Inclined ladder; 7. Annular collection trough; 8. Collection pipe. Detailed Implementation

[0032] like Figure 1-8 As shown: The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to this embodiment includes the following steps:

[0033] S1: According to the design requirements, several prefabricated well sections 3 are manufactured, and each end of the prefabricated well section 3 is equipped with a connecting structure.

[0034] S2: During the construction of the integrated utility tunnel 1, at the location of the pre-set outgoing pipeline, the construction of the connecting channel 2 is carried out simultaneously along the transverse direction of the integrated utility tunnel 1, so that the connecting channel 2 is connected to the integrated utility tunnel 1, and an installation seat 201 is provided at the top of the connecting channel 2.

[0035] S3: Install one of the prefabricated well segments 3 made in step S1 onto the top of the mounting base 201 through the connecting structure, and install the bottom of the next prefabricated well segment 3 onto the top of the previous prefabricated well segment 3 through the connecting structure, thereby completing the installation of all prefabricated well segments 3 in sequence to form an outlet well, so that the outlet well is connected to the connecting channel 2.

[0036] S4: Waterproof structures are provided around the connection points between several prefabricated well sections 3 and the connection points between the prefabricated well sections 3 and the mounting base 201 in step S3.

[0037] S5: Install the conduit in the outlet well according to the design requirements.

[0038] Specifically, according to the design and process requirements, all prefabricated well sections 3 are manufactured in the factory. During the construction of the integrated utility tunnel 1, along the transverse direction of the integrated utility tunnel 1 (i.e., Figure 2 Construction of connecting passage 2 will proceed in the left-right direction (within the middle). Connecting passage 2 will connect to integrated utility tunnel 1. Once the construction of connecting passage 2 is completed, relative to... Figure 2 In the vertical direction, an installation base 201 is provided at the top of the connecting channel 2. Then, the prefabricated well sections 3 are installed in sequence. First, one section of the prefabricated well section 3 is installed on the installation base 201. Then, the next section of the prefabricated well section 3 is installed on the previous section of the prefabricated well section 3. The installation of all the prefabricated well sections 3 is completed in sequence. Finally, the pipeline is installed in the outlet well. Compared with the existing technology, the amount of earthwork can be greatly reduced, the cost of earthwork excavation, transportation and backfilling can be significantly reduced, and the construction cycle can be effectively shortened.

[0039] In this embodiment, in step S3, the integrated utility tunnel 1, the connecting passage 2, and the outlet well are sequentially connected to form a continuous outlet passage. This facilitates the outlet of pipelines, makes it easier for construction personnel to carry out outlet construction, and also provides protection for the pipelines.

[0040] In this embodiment, in step S1, the prefabricated well section 3 is manufactured in a factory. The prefabricated well section 3 is a hollow structure with openings at both ends. The prefabricated well section 3 includes several prefabricated well sections I 301 and several prefabricated well sections II 302, which are arranged at intervals along the outgoing direction. One prefabricated well section I 301 is installed on the top of the mounting base 201. The several prefabricated well sections I 301 and several prefabricated well sections II 302 are arranged along the outgoing direction (or relative to...) Figure 2 The prefabricated well sections (in the vertical direction) are arranged at intervals, and adjacent prefabricated well sections I301 and II302 are sealed together to form an outlet well, which facilitates pipeline construction. In addition, an appropriate number of prefabricated well sections I301 and II302 can be selected according to construction requirements to meet different usage needs.

[0041] In this embodiment, the lower end of the prefabricated well section I 301 is provided with a connecting ring protrusion 303, the upper end of the prefabricated well section I 301 is provided with a mortise joint 307, the lower end of the prefabricated well section II 302 is provided with a tenon head 308 that mates with the mortise joint 307, and the upper end of the prefabricated well section II 302 is provided with a connecting ring groove 304 that mates with the connecting ring protrusion 303.

[0042] like Figure 4 and Figure 5 As shown, the connecting ring protrusion 303, connecting ring groove 304, tenon head 308, and mortise joint 307 constitute the aforementioned connecting structure, relative to... Figure 4 In the vertical direction, the connecting ring protrusion 303 is an annular protrusion, the connecting ring groove 304 is an annular groove, and the structure of the tenon head 308 and the mortise 307 is as follows: Figure 5 As shown, the mortise and tenon structure can improve the firmness of the connection between prefabricated well section I301 and prefabricated well section II302, solving the dual problems of easy displacement and leakage in traditional spliced ​​wells, and greatly reducing the risk of leakage.

[0043] In this embodiment, an annular water-stop strip is provided inside the connecting groove 304. By setting an expansion-type water-stop strip with a U-shaped cross-section, the waterproof performance of the precast well section connection can be improved. Furthermore, combined with the tenon and mortise structure, it can resist the lateral pressure of earthwork backfilling, further reducing the risk of displacement of the precast well section.

[0044] In this embodiment, in step S4, the waterproof structure includes a waterproof layer 5 and a concrete layer 4. The waterproof layer 5 is disposed on the outer periphery of the connection between adjacent precast well sections, and the concrete layer 4 is disposed on the outer periphery of the waterproof layer 5. Figure 7 As shown, by setting up a waterproof layer 5 and a concrete layer 4, a vertical structural anti-seepage barrier is constructed, which can further reduce the risk of water leakage.

[0045] In this embodiment, step S4 further includes a seepage collection component, which includes an annular collection trough 7 and a collection pipe 8 communicating with the annular collection trough 7. The annular collection trough 7 is fixedly installed on the lower part of the inner side wall of the mounting base 201 and is used to collect seepage water flowing down the inner side wall of the outlet well. The collection pipe 8 is used to guide the seepage water collected in the annular collection trough 7 to the water collection ditch of the integrated pipe gallery 1.

[0046] like Figure 8 As shown, relative to Figure 8 In the vertical direction, the annular collection trough 7 is fixedly installed on the lower part of the inner side wall of the mounting base 201, and the cross-section of the annular collection trough 7 is U-shaped, which facilitates the collection of leakage water. Since the collection pipe 8 is connected to the annular collection trough 7, the leakage water collected by the annular collection trough 7 is guided to the water collection ditch of the integrated pipe gallery 1 through the collection pipe 8.

[0047] In this embodiment, the prefabricated well section I 301 is provided with a grouting port 306, which is located near the connecting annular protrusion 303. For example... Figure 4 and Figure 6 As shown, by setting grouting port 306, when leakage occurs at the connection of the precast well section, grout can be injected through grouting port 306 to seal the leakage point, thereby facilitating emergency treatment and subsequent maintenance of the project.

[0048] In this embodiment, an inclined ladder 6 is installed inside the outlet well. By installing the inclined ladder 6, construction personnel can easily enter and exit the outlet well to install the conduit, which improves construction efficiency and ensures personnel safety.

[0049] In this embodiment, the mounting base 201 is provided with a mounting ring groove that mates with the connecting ring protrusion 303 of the prefabricated well section I 301. This facilitates the installation of the prefabricated well section I 301. Of course, a waterproof structure is also provided on the outside of the connection between the prefabricated well section I 301 and the mounting base 201 to prevent water leakage.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A construction method for trenchless outgoing pipelines in cast-in-place pipe galleries, characterized in that: Includes the following steps: S1: According to the design requirements, several prefabricated well sections are manufactured, and each prefabricated well section has a connecting structure at both ends; S2: During the construction of the integrated utility tunnel, at the location of the pre-set outgoing pipeline, the construction of the connecting channel is carried out simultaneously along the transverse direction of the integrated utility tunnel, so that the connecting channel is connected to the integrated utility tunnel, and an installation seat is provided at the top of the connecting channel. S3: Install one of the prefabricated well segments made in step S1 onto the top of the mounting base through a connecting structure, and install the bottom of the next prefabricated well segment onto the top of the previous prefabricated well segment through a connecting structure, thereby completing the installation of all prefabricated well segments in sequence to form an outlet well, so that the outlet well is connected to the connecting channel. S4: Waterproof structures are provided around the connection points between several prefabricated well sections and the connection points between the prefabricated well sections and the mounting base in step S3. S5: Install the conduit in the outlet well according to the design requirements.

2. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 1, characterized in that: In step S3, the integrated utility tunnel, connecting passage, and outgoing well are connected in sequence to form a continuous outgoing passage.

3. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 1, characterized in that: In step S1, the prefabricated well section is manufactured in the factory. The prefabricated well section is a hollow structure with open ends. The prefabricated well section includes several prefabricated well sections I and several prefabricated well sections II. The prefabricated well sections I and II are arranged at intervals along the outgoing line direction, and one prefabricated well section I is installed on the top of the mounting base.

4. The construction method for non-reverse excavation outgoing pipelines for cast-in-place pipe galleries according to claim 3, characterized in that: The lower end of the prefabricated well section I is provided with a connecting ring protrusion, the upper end of the prefabricated well section I is provided with a mortise joint, the lower end of the prefabricated well section II is provided with a tenon head that mates with the mortise joint, and the upper end of the prefabricated well section II is provided with a connecting ring groove that mates with the connecting ring protrusion.

5. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 4, characterized in that: The connecting ring groove is provided with an annular water-stopping strip.

6. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 1, characterized in that: In step S4, the waterproof structure includes a waterproof layer and a concrete layer. The waterproof layer is disposed on the outer periphery of the connection between adjacent precast well sections, and the concrete layer is disposed on the outer periphery of the waterproof layer.

7. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 1, characterized in that: Step S4 also includes a seepage collection component, which includes an annular collection trough and a collection pipe connected to the annular collection trough. The annular collection trough is fixedly installed on the lower part of the inner side wall of the mounting base and is used to collect seepage water flowing down the inner side wall of the outlet well. The collection pipe is used to guide the seepage water collected in the annular collection trough to the water collection ditch of the integrated pipe gallery.

8. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 4, characterized in that: The prefabricated well section I has a reserved grouting port, which is located near the connecting annular protrusion.

9. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 1, characterized in that: An inclined ladder is installed inside the outlet well.

10. The construction method for trenchless outgoing pipelines in cast-in-place pipe galleries according to claim 4, characterized in that: The mounting base is provided with a mounting ring groove that mates with the connecting ring protrusion of the precast well section I.

Images