A local reinforcement device for pipe jacking in ground fissure sections and its construction method

Abstract

The invention discloses a local reinforcement device for a jacking pipe in a ground fissure section and a construction method thereof, belonging to the field of pipeline engineering construction. The local reinforcement device for a jacking pipe in a ground fissure section and the construction method thereof fully combine the advantages of local flexible connection and overall structural strengthening: the pipe body of the jacking pipe near both sides of the ground fissure is reinforced by pouring concrete and adding I-beams to improve its stiffness and strength, and at the same time, it is anchored by planting steel bars and expansion screws to avoid local stress concentration causing damage to the pipe body of the jacking pipe or concrete cracking; a sealing rubber ring with good flexibility and deformability and an embedded corrugated pipe are embedded at the ground fissure dislocation to ensure that the pipeline presents a staged distribution but maintains overall continuity. Compared with the traditional reinforced concrete jacking pipe, the invention effectively avoids the danger of structural damage caused by the dislocation of the ground fissure.

Description

Technical Field

[0001] The invention belongs to the field of pipeline engineering construction, in particular to a local reinforcement device for jacking pipes in ground fissure sections and a construction method thereof. Background Art

[0002] With the increasing number and diversification of pipeline projects, pipe jacking technology is widely used in the construction of underground pipelines. It is especially preferred in urban centers with dense populations and heavy traffic. At the same time, the application of ultra-long distance and large-section pipe jacking technology is becoming more and more common. However, with the continuous expansion of pipe jacking construction areas, the geological problems encountered are becoming increasingly prominent, and ground fissure activity is one of them. Ground fissures are geological phenomena in which surface rocks and soils crack under the action of natural or human factors, and cracks of a certain length and width are formed on the ground. According to different causes, they are divided into: (1) tectonic ground fissures, such as ground fissures caused by earthquakes, volcanoes, and rock crust creep; (2) non-tectonic ground fissures, such as landslide ground fissures before slope instability, collapse-type and ground subsidence-type subsidence ground fissures, expansion or wet deformation ground fissures, waterlogging, dry-wet and freeze-thaw ground fissures, etc.; (3) compound ground fissures. As of the end of 1999, statistics showed that there were more than 6,000 ground fissures of a certain scale that needed people's attention in the country, of which tectonic ground fissures accounted for about 80%. For example, there are 286 ground fissures in the Fenwei Basin, of which 82% are structural fissures and 18% are non-structural fissures.

[0003] The impact of crack activity on the stability of underground pipelines is manifested in the additional deformation and additional stress of the jacking pipe body caused by uneven deformation. Excessive deformation leads to damage to the lining structure and leakage, or excessive displacement at the jacking connection leads to damage to the anti-seepage material and leakage; at the same time, uneven settlement differences cause additional stress in the internal structure and may be damaged. Especially in areas near earthquake zones, seismic movement may cause further development and changes in ground fissures, and at the same time cause dynamic response reactions of the original soil, resulting in significant changes in mechanical properties. The rapid development and changes of ground fissures and the generation of secondary ground fissures under the action of strong earthquakes in the far and near fields, as well as the changes in the engineering properties of the surrounding rock and soil under the coupling of strong earthquakes, will inevitably cause dynamic effects on the lining structure, thereby causing damage to underground pipelines.

[0004] At present, the following four measures are often adopted to reduce safety risks for underground projects crossing ground fissures: (1) the tunnel across the ground fissure section adopts the open-cut method to set up special deformation joints in sections; (2) the tunnel across the ground fissure section is strengthened; (3) the clear height of the tunnel is reserved for settlement space; (4) flexible joints are set up. However, due to the complexity of underground projects and the uncertainty of ground fissure activity, the existing prevention and control measures are often insufficient to deal with the disasters caused by ground fissure activity. At the same time, deep foundation pits with open-cut method also face many risks in dense and complex urban areas. Therefore, it is necessary to innovate the response measures for the non-excavation state of pipe jacking crossing ground fissures and develop safe and applicable prevention and control methods. Summary of the Invention

[0005] The object of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a local reinforcement device for pipe jacking in the ground fissure section and its construction method.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A local reinforcement device for pipe jacking in the ground fissure section includes a reinforced concrete lining pipe section passing through the ground fissure, and the ground fissure is the connection part of two reinforced concrete lining pipe sections;

[0008] A reinforced concrete layer is provided inside each of the reinforced concrete lining pipe sections, and I-beams with radial ribs are evenly distributed on the inner wall of the reinforced concrete layer. A high-polyester slurry layer is provided outside the reinforced concrete lining pipe section; several anchor planting bars are provided between the reinforced concrete lining pipe section and the reinforced concrete layer;

[0009] An embedded corrugated pipe is provided at the connection part of two reinforced concrete lining pipe sections, which is embedded in the reinforced concrete lining pipe section and the reinforced concrete layer.

[0010] Further, the connection length of the embedded corrugated pipe in the reinforced concrete lining pipe section is 1 / 4 of the length of the reinforced concrete lining pipe section.

[0011] Further, grouting holes are distributed on the reinforced concrete lining pipe section.

[0012] Further, the grouting holes and the anchor planting bars are arranged corresponding to each other in the radial direction.

[0013] Further, the I-beams with radial ribs are fixed on the inner wall of the reinforced concrete layer by expansion bolts.

[0014] Further, the embedded corrugated pipe is connected with the reinforced concrete lining pipe section and the reinforced concrete layer into a whole through pins and planted bars.

[0015] Further, a sealing rubber ring is provided on the reinforced concrete lining pipe section corresponding to the ground fissure.

[0016] A construction method for a local reinforcement device for pipe jacking in the ground fissure section includes the following steps:

[0017] (1) Jack the reinforced concrete lining pipe sections in segments by the earth pressure balance method or the slurry balance method;

[0018] (2) Open grouting holes on the reinforced concrete lining pipe sections on both sides near the ground fissure, and grout outside the reinforced concrete lining pipe sections through the grouting holes to form a high-polyester slurry layer;

[0019] (3) Inject the injection - type rebar glue into the grouting holes to implant the anchor bars, and then pour the concrete to form a reinforced concrete layer on the inner side of the pipe section of the reinforced concrete lining layer.

[0020] (4) Fix the I - beam on the inner side of the reinforced concrete layer by using expansion bolts.

[0021] (5) At the connection of the pipe sections of the reinforced concrete lining layer on both sides of the ground fissure, use pins and implanted bars to connect the outer side of the embedded corrugated pipe with the pipe section of the reinforced concrete lining layer and the inner reinforced concrete layer.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The local reinforcement device and its construction method for the pipe - jacking in the ground fissure section of the present invention fully combine the advantages of local flexible connection and overall structural strengthening: The pipe sections of the reinforced concrete lining layer near both sides of the ground fissure are reinforced by pouring concrete and adding ribs with I - beams to improve their stiffness and strength, and at the same time, they are anchored by implanted bars and expansion bolts to avoid local stress concentration causing damage to the pipe body of the pipe - jacking or cracking of the concrete; At the ground fissure dislocation, a flexible and deformable sealing rubber ring and an embedded corrugated pipe are embedded to ensure that the pipeline shows a staged distribution while maintaining overall continuity. Compared with the traditional reinforced concrete pipe - jacking, the device of the present invention can effectively avoid the risk of structural damage caused by the ground fissure dislocation. At the same time, the sealing ring and the embedded corrugated pipe play a role in ensuring the continuity of the pipeline and also in sealing and waterproofing, which can prevent groundwater leakage and effectively protect the internal line equipment; And compared with the traditional trenchless pipe - jacking construction, it will not increase the construction difficulty additionally, and the local reinforcement measures taken can be carried out after the jacking construction. In addition, the embedded corrugated pipe, I - beam, and preset rebar plate adopted in the present invention can all be pre - fabricated in blocks in the factory, assembled on - site and anchored, and then concrete is poured, which has the advantages of convenient construction and low difficulty. Brief Description of the Drawings

[0024] Figure 1 It is a cross - sectional view of the present invention;

[0025] Figure 2 It is a longitudinal section view of the present invention;

[0026] Figure 3 It is a longitudinal sectional view at the connection of two pipe sections of the present invention;

[0027] Figure 4 It is a longitudinal section view of the embedded corrugated pipe of the present invention;

[0028] Figure 5 It is an application schematic diagram of the present invention.

[0029] Wherein: 1 - high polyester slurry layer, 2 - reinforced concrete lining pipe joint, 2-1 - pipe joint on the left side of the ground fissure, 2-2 - pipe joint on the right side of the ground fissure, 2-3 - sealing rubber ring, 2-4 - socket and spigot, 2-5 - longitudinal reinforcement, 2-6 - circumferential reinforcement, 3 - reinforced concrete layer, 4 - I-beam, 5 - anchor planting bars, 6 - grouting holes, 7 - embedded corrugated pipe. Detailed implementation manners

[0030] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings:

[0033] See Figure 1 and Figure 2 , Figure 1 is a cross-sectional view of the present invention, Figure 2 is a longitudinal sectional view of the present invention. A local reinforcement device for a jacking pipe in a ground fissure section proposed by the present invention is composed of a high polyester slurry layer 1, a reinforced concrete lining layer pipe joint 2 and a reinforced concrete layer 3 from outside to inside in the radial direction. On the inner wall of the reinforced concrete layer 3 in the non-ground fissure section, several radially ribbed I-beams 4 are provided, while on the inner wall of the reinforced concrete layer 3 corresponding to the ground fissure section, an embedded corrugated pipe 7 is provided to play the role of a local flexible joint; there are anchor planting bars 5 between the reinforced concrete layer 3 and the reinforced concrete lining layer pipe joint 2, and the radially ribbed I-beams 4 are fixed on the inner wall of the reinforced concrete layer 3 through expansion bolts; grouting holes 6 are distributed on the reinforced concrete lining layer pipe joint 2, the high polyester slurry layer 1 is formed by grouting through the grouting holes 6, and the anchor planting bars 5 are arranged in the grouting holes 6.

[0034] See Figure 3 , Figure 3 , which is the longitudinal sectional view of the connection of two pipe segments of the present invention. The axial direction of the jacking pipe segment is vertically intersected with the ground fissure. The ground fissure is at the connection of the left pipe segment 2-1 and the right pipe segment 2-2 of the ground fissure. The upper and lower ends of the left pipe segment 2-1 and the right pipe segment 2-2 of the ground fissure are the longitudinal bars 2-5 and the circumferential bars 2-6 of the pipe segment body. A sealing rubber ring 2-3 is provided at the connection of the left pipe segment 2-1 and the right pipe segment 2-2 of the ground fissure. A socket 2-4 is provided at the lower end of the connection of the left pipe segment 2-1 and the right pipe segment 2-2 of the ground fissure. An embedded corrugated pipe 7 is provided on the left pipe segment 2-1 and the right pipe segment 2-2 of the ground fissure at the socket 2-4. The embedded corrugated pipe 7 is connected to the reinforced concrete lining pipe segment 2 and the inner reinforced concrete layer 3 as a whole through pins and implanted bars.

[0035] The range of the embedded corrugated pipe 7 on each side at the ground fissure can be one-fourth of the pipe segment length. The embedded corrugated pipe 7 has reserved holes on the outside for pin and implanted bar anchoring.

[0036] See Figure 4 , Figure 4 , which is the longitudinal sectional view of the embedded corrugated pipe of the present invention. The material of the embedded corrugated pipe 7 can be high-density polyethylene (HDPE). Its serrated flexible material adapts to the dislocation deformation of the ground fissure, ensures the overall continuity of the pipeline, and also plays a role in sealing and waterproofing.

[0037] See Figure 5 , Figure 5 , which is the application schematic diagram of the present invention. It can be seen that there is a section of reinforced concrete layer 3 inside the cylindrical reinforced concrete lining pipe segment 2. A number of I-beams 4 are evenly distributed on the inner wall of the reinforced concrete layer 3. There is a high polyester slurry layer 1 outside the reinforced concrete lining pipe segment 2. The high polyester slurry layer 1 is arranged corresponding to the reinforced concrete layer 3.

[0038] The present invention strengthens the overall structure of the jacking pipe body near the ground fissure, and for the connection passing through the ground fissure, an embedded corrugated pipe is used in cooperation with a sealing rubber ring to form a local flexible joint to ensure the integrity of the structure under the dislocation of the ground fissure; the thickness of the reinforced concrete layer and the type of the radially ribbed I-beam can be adjusted according to different ground fissure activity levels.

[0039] A construction method of a local reinforcement device for a jacking pipe in a ground fissure section includes the following steps:

[0040] 1. Adopt the earth pressure balance method or the slurry balance method to jack the reinforced concrete lining pipe segment 2 in sections;

[0041] 2. Open grouting holes 6 on the reinforced concrete lining pipe segments 2 on both sides of the ground fissure, and inject grouting into the outer sides of the reinforced concrete lining pipe segments 2 through the grouting holes 6 to form a high polyester slurry layer 1;

[0042] 3. Use injection-type anchoring glue to implant anchor steel bars 5 in the grouting holes 6, and then pour to form a reinforced concrete layer 3 inside the reinforced concrete lining layer pipe section 2;

[0043] 4. Use expansion screws to fix the I-beam 4 to the inner side of the reinforced concrete layer 3;

[0044] 5. At the connection points of the reinforced concrete lining pipe sections 2 on both sides of the ground fissure, use pins and embedded steel bars to connect the outer side of the embedded corrugated pipe 7 to the reinforced concrete lining pipe section 2 and the inner reinforced concrete layer 3.

[0045] The present invention adopts the traditional segmented earth pressure balance method or mud-water balance method for construction, which is convenient to construct and has strong adaptability. At this time, the inner reinforcement concrete layer 3 is added to the inner wall of the top pipe segment near both sides of the ground fissure after the construction is completed, and has high strength and rigidity. The anchoring reinforcement between it and the reinforced concrete lining layer segment 2 is completed by injection-type rebar glue. The process is simple and easy to operate. When the reinforced concrete structure is reinforced and renovated by rebar technology, the concrete strength grade of the original component should be determined according to the on-site test results. When HRB400 grade rebar is used for planting, the concrete of the original component shall not be lower than C20. The density of rebar planting and the type of steel bar can be appropriately adjusted during actual construction, but it should be kept uniform within the range of the inner concrete layer 3, and should be kept consistent with the original rebar spacing in the reinforced concrete lining layer segment 2 as much as possible to prevent concrete splitting.

[0046] The present invention combines the advantages of local flexible joints and overall structural reinforcement. When ground fissures shift under earthquake action, on the one hand, the additional stress on the pipe body caused by uneven deformation is shared by the lining, concrete layer, and I-beam after local reinforcement, which can improve the stiffness and strength of the single pipe section and ensure local integrity. On the other hand, the stepped displacement caused by the shift in the ground fissures is accommodated by the flexible and deformable sealing rubber ring and embedded bellows at the pipe connection, ensuring the continuity of the entire pipeline. Therefore, the local reinforcement measures of the local flexible joints and overall structural reinforcement of the present invention can avoid the uneven settlement and local stress concentration caused by the activity of the ground fissures from damaging the pipe body, and can achieve effective protection for internal urban cables, optical cables, and other line equipment. Furthermore, when the ground fissures in the site are currently inactive, or the ground fissures are buried deep and have a relatively small impact on the pipe construction area, the thickness of the concrete reinforcement layer and the type of I-beam can be appropriately adjusted, and the connection of the embedded bellows and sealing rubber ring to the main structure is simple and reliable.

[0047] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A local reinforcement device for pipe jacking in a ground fissure section, characterized in that, It includes a reinforced concrete lining pipe section (2) arranged across the ground fissure, and the ground fissure is the connection part of two reinforced concrete lining pipe sections (2). A reinforced concrete layer (3) is provided inside each of the reinforced concrete lining pipe sections (2). I-beams (4) with radial ribs are evenly distributed on the inner wall of the reinforced concrete layer (3). A high-polyester slurry layer (1) is provided outside the reinforced concrete lining pipe section (2). A number of anchor planting bars (5) are provided between the reinforced concrete lining pipe section (2) and the reinforced concrete layer (3). An embedded corrugated pipe (7) is provided at the connection part of two reinforced concrete lining pipe sections (2), which is embedded in the reinforced concrete lining pipe section (2) and the reinforced concrete layer (3). The I-beams (4) with radial ribs are fixed to the inner wall of the reinforced concrete layer (3) by expansion bolts. The embedded corrugated pipe (7) is connected to the reinforced concrete lining pipe section (2) and the reinforced concrete layer (3) as a whole through pins and planting bars. Sealing rubber rings (2-3) are provided on the reinforced concrete lining pipe sections (2) corresponding to the ground fissure.

2. The local reinforcement device for the jacked pipe in the ground fissure section according to claim 1, characterized in that, The connection length of the embedded corrugated pipe (7) in the reinforced concrete lining pipe section (2) is 1 / 4 of the length of the reinforced concrete lining pipe section (2).

3. The local reinforcement device for the jacked pipe in the ground fissure section according to claim 1, characterized in that, Grouting holes (6) are distributed on the reinforced concrete lining pipe section (2).

4. The local reinforcement device for the pipe jacking in the ground fissure section according to claim 3, characterized in that, The grouting holes (6) and the anchor planting bars (5) are arranged corresponding to each other in the radial direction.

5. A construction method of a local reinforcement device for a jacking pipe in a ground fissure section according to any one of claims 1-4, characterized in that, It includes the following steps: (1), Adopt the earth pressure balance method or the slurry balance method to jack the reinforced concrete lining pipe section (2) in sections. (2), Open grouting holes (6) on the reinforced concrete lining pipe sections (2) near both sides of the ground fissure, and grout outside the reinforced concrete lining pipe section (2) through the grouting holes (6) to form a high-polyester slurry layer (1). (3), Use injection-type planting bar glue to implant anchor planting bars (5) in the grouting holes (6), and then pour to form a reinforced concrete layer (3) inside the reinforced concrete lining pipe section (2). (4), Fix the I-beams (4) to the inner side of the reinforced concrete layer (3) by using expansion bolts. (5), At the connection part of the reinforced concrete lining pipe sections (2) on both sides of the ground fissure, connect the outer side of the embedded corrugated pipe (7) to the reinforced concrete lining pipe section (2) and the inner reinforced concrete layer (3) by using pins and planting bars.

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