Lateral connection structure and method for branch pipe of drainage shield main pipe

Abstract

The invention discloses a structure and method for laterally connecting a drainage branch pipe into a shield main pipe, namely, the branch pipe is connected into the main pipe in an underground excavation mode, and the method mainly comprises the steps that (1) the main pipe is protected, soil in a certain range of the outer side of the main pipe is reinforced, and a temporary steel support of the inner structure of the main pipe is reinforced; (2) a branch pipe inspection well enclosure prefabricated steel casing is constructed to the corresponding elevation; (3) when mechanical underground excavation is conducted along the branch pipe line through the prefabricated steel casing to the position close to the lateral position of the main pipe, the detachable shield main pipe segment block is dismantled, and mechanical underground excavation operation continues till all the branch pipes enter the main pipe; and (4) filling gaps of the steel pipes at the holes and cavities in the steel pipe pieces with micro-expansive concrete. The influence on road traffic and the surrounding environment due to the fact that a conventional pipeline is connected into an excavated road surface is avoided, safety and reliability are achieved, and the branch pipe connecting efficiency is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of municipal underground drainage pipe network connection, and in particular relates to a branch pipe lateral access structure and method for a drainage shield main pipe. Background Art

[0002] The branch pipe access of the urban drainage network system is usually carried out by trench excavation, which has a long access period and has a great impact on ground traffic and the surrounding environment. When the branch pipe is connected to the main pipe, the sealing treatment of the main pipe access port (opening) is more important. After a period of application, the conventional access treatment method usually has different degrees of leakage, which causes sewage to mix with groundwater, which will not only cause a certain degree of pollution to the groundwater, but also increase the drainage volume of the main pipe, resulting in an increase in the treatment load of the sewage plant. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a branch pipe lateral access structure and method for a drainage shield main pipe, so as to solve the deficiencies in the prior art.

[0004] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0005] On the one hand, a lateral access structure for branches of a drainage shield main pipe is provided, which includes a manhole enclosure, wherein the manhole enclosure is a prefabricated steel casing, the prefabricated steel casing has a first pipe position for connecting pre-laid branch pipes, the main pipe has a reinforcement structure, and the side of the main pipe has a second pipe position for connecting the branch pipes, the first pipe position is aligned with the second pipe position, and a detachable shield main pipe segment block is provided in the second pipe position.

[0006] For example, the lateral access structure of the branch pipe of the drainage shield main pipe, wherein the reinforcement structure includes external soil reinforcement and internal support reinforcement.

[0007] On the other hand, a method for lateral access of a branch pipe of a drainage shield main pipe is provided, wherein the method is implemented based on the lateral access structure of the branch pipe of the drainage shield main pipe as described above, and comprises the following steps:

[0008] S1. Strengthen and protect the shield main pipe, which includes strengthening the soil in a certain range outside the main pipe and strengthening the temporary steel support inside the main pipe;

[0009] S2. Construct prefabricated steel casing for the branch inspection well enclosure, sink the prefabricated steel casing to the predetermined depth and elevation, and seal the bottom with reinforced concrete;

[0010] S3. When mechanically excavating along the branch pipe line through the first pipe position of the prefabricated steel casing to the second pipe position close to the main pipe, remove the detachable shield main pipe segment at the hole opening and continue mechanical excavation until all the branch pipes enter the main pipe;

[0011] S4. Use micro-expansive concrete to fill the gaps between the steel pipes and the cavities inside the steel pipe segments at the second pipe position, and remove the temporary support inside the main pipe after maintenance.

[0012] For example, in the method for lateral access of branch pipes to the main pipe of a drainage shield, the soil reinforcement in the main pipe protection in step S1 is double-liquid grouting reinforcement.

[0013] As described in the method for lateral access of the branch pipe of the drainage shield main pipe, the double liquid is water glass added to the cement slurry, and the mix ratio is determined by an on-site mix ratio test.

[0014] As described in the method for lateral access of branch pipes to the main pipe of a drainage shield machine, wherein the bottom of the prefabricated steel casing in step S2 is serrated.

[0015] As described in the method for lateral access of the branch pipe of the drainage shield main pipe, in step S3, the mechanical excavation is carried out by concealed excavation using a micro-pipe jacking machine.

[0016] As described in the method for lateral access of the branch pipe of the drainage shield main pipe, wherein in step S3, the gap between the second pipe position of the main pipe and the branch pipe is treated with water-expanding water-stopping glue combined with micro-expanding fine stone concrete, and the cavity in the steel pipe segment is filled with micro-expanding fine stone concrete to the inner arc surface.

[0017] For example, in the method for lateral access of branch pipes to the main pipe of a drainage shield, the slightly expansive concrete in step S4 is high-grade fine stone concrete.

[0018] For example, in the method for lateral access of branch pipes of the drainage shield main pipe, when the micro-expanding fine stone concrete is filled to the inner arc surface of the pipe segment in step S4, a structural steel mesh is applied, and then the micro-expanding fine stone concrete is poured.

[0019] As described in the method for lateral access of the branch pipe of the drainage shield main pipe, before the gap between the steel pipe segment and the branch pipe is filled with micro-expanding fine stone concrete for the second time, water-expanding water-stopping glue is applied at the branch pipe position close to the outer arc surface of the pipe segment.

[0020] The beneficial effects of the technical solution of the present invention are:

[0021] The present invention avoids the impact of conventional pipeline access and road excavation on road traffic and the surrounding environment, is safe and reliable, and effectively improves the efficiency of branch pipe access. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0024] Figure 2A large-scale diagram of the access gap in a preferred embodiment of the present invention;

[0025] In the figure: 1. Prefabricated steel casing; 2. First pipe position; 3. Main pipe; 4. Branch pipe; 5. Second pipe position; 6. Removable shield main pipe segment; 7. External soil reinforcement; 8. Internal support reinforcement; 9. Bottom sealing concrete; 10. Reinforcement of the rear backrest and the top exit opening of the jacking pipe; 11. Prefabricated rear backrest and prefabricated working components; 12. Gap; 13. High-grade micro-expansive concrete; 14. Micro-expansive fine stone concrete; 15. Water-expanding waterstop. DETAILED DESCRIPTION

[0026] The terms "invention", "present invention" and "the present invention" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered as limiting.

[0027] The use of "including," "having," and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0028] See also Figure 1 , Figure 2 As shown, in a preferred embodiment, the lateral access structure of the branch pipe of the drainage shield main pipe of the present invention includes an inspection well enclosure, which is a prefabricated steel casing 1. The prefabricated steel casing 1 has a first pipe position 2 for connecting the pre-laid branch pipe, the main pipe 3 has a reinforcement structure, and the side of the main pipe 3 has a second pipe position 5 for connecting the branch pipe 4. The first pipe position 2 is aligned with the second pipe position 5, and a detachable shield main pipe segment block 6 is provided in the second pipe position 5.

[0029] Furthermore, the reinforcement structure includes external soil reinforcement 7 and internal support reinforcement 8.

[0030] The main construction steps of the lateral access method of the branch pipe of the drainage shield main pipe involved in the present invention are as follows:

[0031] a. Measure and mark the location of branch pipes and inspection wells, reinforce main pipe 3, reinforce the soil in a certain range outside main pipe 3 (1 times the pipe diameter outside the main pipe) (MJS, mixing piles, rotary jet piles), and strengthen the internal structure of main pipe 3 with temporary steel supports to ensure the safety and stability of main pipe 3 when branch pipes are connected.

[0032] b. Prefabricated steel casing is constructed for the inspection well. After it is constructed to the designed elevation, the bottom is sealed. The bottom of the first section of the prefabricated steel casing 1 is serrated. When it is driven into the soil to a certain depth by a pipe shaking machine, the soil is excavated. The excavation range does not exceed 0.3m above the serrated surface of the prefabricated steel casing 1. After the excavation is completed, the above pipe shaking and excavation work is continued, and the pipe section extension welding work is carried out until the soil is excavated to the design requirements. The bottom sealing concrete 9 is used to seal the bottom of the pit, and the adjacent pipe sections of the prefabricated steel casing 1 are welded and connected.

[0033] c. Double liquid grouting reinforcement is performed on the soil outside the pre-laid branch pipe position. After it meets the requirements, double liquid grouting reinforcement is performed on both sides of the prefabricated steel casing 1 along the branch pipe line direction to form a reliable jacking backrest and jacking hole reinforcement 10. After the above-mentioned hole reinforcement strength meets the requirements, cutting is performed at the pipe position in the prefabricated steel casing 1. The cutting hole is 100mm larger than the outer diameter of the branch pipe of the pipeline, and the prefabricated hole working surface, prefabricated backrest and prefabricated working components 11 are installed. The gap 12 between the second pipe position 5 of the main pipe 3 and the branch pipe 4 is treated with water-expanding water-stopping glue combined with micro-expanding fine stone concrete, and the cavity in the steel pipe segment is filled with micro-expanding fine stone concrete to the inner arc surface.

[0034] d. Lift the micro pipe jacking machine into the prefabricated steel casing 1 and carry out pipe jacking along the branch pipe 4 using the pipe jacking method (mechanical method) to lay the branch pipe 4. Control the jacking speed. When the branch pipe 4 is close to the main pipe 3, remove the shield pipe segments at the main pipe 3. Continue the pipe jacking operation until all the branch pipes 4 enter the main pipe 3, remove the pipe jacking machine, and remove the steel support inside the main pipe 3.

[0035] e. Use high-grade micro-expansive concrete 13 to fill the steel pipe segment at the opening. When the concrete is filled to the inner surface, arrange the structural steel bars and continue to fill to the inner surface. At the same time, use micro-expansive fine stone concrete 14 to block the gap between the branch pipe 4 and the segment opening. First block half of the pipe wall thickness, put in water-expandable waterproofing glue 15, and continue to block the gap between the branch pipe 4 and the segment opening. When it is flush with the inner arc surface of the segment, smooth all the filling concrete surfaces.

[0036] f. At this point, the connection of the branch pipe 4 to the main pipe 3 is completed.

[0037] The present invention avoids the impact of conventional pipeline access and road excavation on road traffic and the surrounding environment, is safe and reliable, and effectively improves the efficiency of branch pipe access.

[0038] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A lateral access structure for branch pipes of a drainage shield main pipe, characterized in that: It includes an inspection well enclosure, which is a prefabricated steel casing. The prefabricated steel casing has a first pipe position for connecting and plugging in pre-laid branch pipes. The main pipe has a reinforcement structure. The side of the main pipe has a second pipe position for connecting to the branch pipe. The first pipe position is aligned with the second pipe position. A detachable shield main pipe segment block is arranged in the second pipe position.

2. The lateral access structure of the branch pipe of the drainage shield main pipe according to claim 1, characterized in that: The reinforcement structure includes external soil reinforcement and internal support reinforcement.

3. A method for lateral access of branch pipes to a drainage shield main pipe, characterized in that: The implementation of the lateral access structure of the branch pipe of the drainage shield main pipe according to claim 2 includes the following steps: S1. Strengthen and protect the shield main pipe, which includes strengthening the soil in a certain range outside the main pipe and strengthening the temporary steel support inside the main pipe; S2. Construct prefabricated steel casing for the branch inspection well enclosure, sink the prefabricated steel casing to the predetermined depth and elevation, and seal the bottom with reinforced concrete; S3. When mechanically excavating along the branch pipe line through the first pipe position of the prefabricated steel casing to the second pipe position close to the main pipe, remove the detachable shield main pipe segment at the hole opening and continue mechanical excavation until all the branch pipes enter the main pipe; S4. Use micro-expansive concrete to fill the gaps between the steel pipes and the cavities inside the steel pipe segments at the second pipe position, and remove the temporary support inside the main pipe after maintenance.

4. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 3, characterized in that: The soil reinforcement in the main pipe protection in step S1 is double-liquid grouting reinforcement.

5. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 4, characterized in that: Double liquid is the addition of water glass into cement slurry, and the mix ratio is determined by on-site mix test.

6. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 3, characterized in that: The bottom of the prefabricated steel casing in step S2 is serrated.

7. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 3, characterized in that: In step S3, mechanical excavation is performed by concealed excavation using a micro pipe jacking machine.

8. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 3, characterized in that: In step S3, the gap between the second pipe position of the main pipe and the branch pipe is treated with water-expanding water-stopping glue combined with micro-expanding fine stone concrete, and the cavity in the steel pipe segment is filled with micro-expanding fine stone concrete to the inner arc surface.

9. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 3, characterized in that: The slightly expansive concrete in step S4 is high-grade fine stone concrete.

10. The method for lateral access of branch pipes to the main pipe of a drainage shield as claimed in claim 9, characterized in that: When the slightly expanded fine stone concrete is filled to the inner curved surface of the pipe segment in step S4, a structural steel mesh is applied, and then the slightly expanded fine stone concrete is poured.

11. The method for lateral access of branch pipes to a drainage shield main pipe as claimed in claim 10, characterized in that: Before the gap between the steel pipe segment and the branch pipe is filled with slightly expansive fine stone concrete for the second time, water-expanding waterstop glue is applied at the branch pipe position close to the outer arc surface of the pipe segment.

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