Non-excavation nodular cast iron jacking pipe

Abstract

The utility model discloses a trenchless nodular cast iron jacking pipe which comprises a nodular cast iron pipe, a cement lining and a concrete protection layer, the cement lining and the concrete protection layer are arranged on the inner side and the outer side of the nodular cast iron pipe respectively, a plurality of grouting holes with internal threads are formed in the middle of the nodular cast iron pipe, and plugs are installed in the grouting holes. A lengthening pipe concentric with the grouting hole is fixedly arranged at the position, located at the grouting hole, of the outer side of the nodular cast iron pipe, the lengthening pipe penetrates through the concrete protection layer, internal threads are formed in the inner side of the outer end of the lengthening pipe, and a one-way valve is installed on the inner side of the outer end of the lengthening pipe. According to the trenchless nodular cast iron jacking pipe, on the premise that the original function of the trenchless nodular cast iron jacking pipe is not affected, during jacking installation, lubricating materials can be poured to the outer surface of the jacking pipe, resistance is reduced, and the service life of the jacking pipe is prolonged. The problem that in the nodular cast iron pipe jacking construction process, construction can be continued only when jacking force is increased abnormally due to various reasons is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the nodular cast iron pipe technical field especially relates to a non-excavation nodular cast iron jacking pipe. BACKGROUND

[0002] The nodular cast iron pipe is the pipe material that the cast molten iron is added after the spheroidizing agent, is formed through centrifugal nodular cast iron machine high speed centrifugal casting, is widely used in non-excavation construction.The non-excavation construction technology is the laying and updating of nodular cast iron pipeline in the case of not excavating the ground, and the non-excavation construction has the characteristics of not damaging the environment and not affecting the traffic, and can implement the construction of various underground pipelines in some regions where excavation construction cannot be implemented, such as bustling city, historical relic protection area, crop and vegetation protection area, and crossing highway, railway, building and river lake etc.At present, the common non-excavation construction technology is mainly divided into traction method and jacking method.

[0003] The jacking technology is a non-excavation tunneling type pipe laying construction technology for municipal construction, and the construction pipe diameter is generally DN700-DN2600, and the advantages are that the surrounding environment is not affected or the influence is small, the construction site is small, the noise is small, and the underground operation can be deepened, which is an incomparable advantage of excavation pipe burying.The working principle of the jacking technology is that the tool pipe or the tunneling machine is pushed from the working well through the soil layer to the receiving well and is hoisted, with the help of the thrust of the main jacking cylinder.At the same time, the pipe following the tool pipe or the tunneling machine is buried between the two wells, and the underground pipe laying is realized without excavation.

[0004] The nodular cast iron pipe jacking construction technology is based on the nodular cast iron pipe, and through the measures of outer wrapping cement and increasing flange and reinforcing rib, the construction technology that the pipe is pushed into the ground in sections without excavating the trench with the help of the jacking device is formed, the consistency of the whole pipe material can be guaranteed, and it is a non-pollution and high-efficiency construction technology.Compared with the previously widely used steel pipe jacking technology, the nodular cast iron pipe jacking technology has the characteristics of corrosion resistance, earthquake resistance, long service life, simple installation, high safety, high jacking precision, and is more and more favored by the market.

[0005] Generally, the trenchless ductile iron pipe jacking construction will make a plan and analysis on the whole jacking route and soil environment before the project starts, but various unexpected situations often occur during the actual construction, which can cause the jacking force to abnormally increase, such as: soil collapse or the front end of the tool pipe encountering obstacles, which increases the resistance; the pipe axis deviation forms a curve, which increases the friction resistance; the change of stratum conditions, such as from medium-coarse sand layer to pulse residual cohesive soil layer, or from single soil layer to composite soil layer, which increases the resistance. The excessive jacking force is not conducive to the jacking equipment, the pipe itself and the auxiliary facilities such as the back-pushing retaining wall, and also affects the jacking construction progress and causes losses. When the required jacking force exceeds the maximum allowable jacking force of the product design, the construction has to be stopped, which seriously affects the smooth progress of the project. Practical new type content

[0006] In view of the technical problems in the background art, the present application provides a trenchless ductile iron pipe jacking, which can inject lubricating material to the outer surface of the pipe jacking without affecting the original function of the trenchless ductile iron pipe jacking, reduces the resistance, effectively solves the problem of abnormal increase of jacking force caused by various reasons during the construction of the ductile iron pipe jacking, and effectively improves the installation efficiency of the pipe jacking.

[0007] The technical solution of the present application to solve the technical problems is as follows:

[0008] According to one aspect of the present application, a trenchless ductile iron pipe jacking is provided, which comprises a ductile iron pipe and a cement lining and a concrete protective layer arranged on the inner and outer sides of the ductile iron pipe respectively, a plurality of grouting holes with internal threads are arranged in the middle of the ductile iron pipe, a plug is installed in the grouting hole, an extension pipe is fixedly arranged on the outer side of the ductile iron pipe at the position of the grouting hole and is concentric with the grouting hole, the extension pipe penetrates the concrete protective layer, an internal thread is arranged on the outer end of the extension pipe and a one-way valve is installed.

[0009] Further, the grouting hole is 3, which is uniformly arranged along the circumference of the ductile iron pipe.

[0010] Further, the inner diameter of the grouting hole is 3 / 4-1 inch.

[0011] Further, the end of the extension pipe is welded and fixed to the ductile iron pipe.

[0012] Further, the outer end of the extension pipe is lower than the concrete protective layer, and a flared mouth is arranged outside the outer end of the extension pipe.

[0013] Further, a jacking flange is arranged on one side of the outer part of the ductile iron pipe, and a reinforcing rib is arranged between the inner side of the jacking flange and the ductile iron pipe.

[0014] Further, the reinforcing bars are located inside the concrete protective layer, and a reinforcing mesh is arranged in the concrete protective layer and connected with the ductile iron pipe and the reinforcing bars.

[0015] Further, the plug is provided with a rubber sealing ring.

[0016] Compared with the prior art, the non-excavation ductile iron pipe has the following beneficial effects:

[0017] (1) The non-excavation ductile iron pipe has the advantages of novel structure, reasonable design, convenient processing and operation, maintenance-free, and the like, which can improve the application time of the non-excavation ductile iron pipe in various soil environments, and effectively improve the installation efficiency of the non-excavation ductile iron pipe and reduce the comprehensive use cost.

[0018] (2) The production design concept of the original non-excavation ductile iron pipe is changed, the grouting hole is arranged in the pipe body, the lubrication and drag reduction demand during construction is considered at the production end, the grouting hole on the ductile iron pipe is simple in design and convenient in processing and manufacturing, and complex equipment and tedious process are not needed, only simple tapping is needed, and any function of the non-excavation ductile iron pipe is not affected.

[0019] (3) The one-way valve mounted at the end has low cost and stable performance, can effectively prevent the backflow of lubricating material, ensure that the outer surface of the pipe is fully lubricated during construction, and the stainless steel plug and the sealing ring matched with the one-way valve have good sealing performance, do not affect the pressure-bearing capacity and sealing performance of the entire pipeline during use, and eliminate the risk of water seepage.

[0020] (4) During construction of the non-excavation ductile iron pipe, only the plug needs to be removed, the grouting pipe is connected with the grouting hole through the grouting pipe joint, after grouting is completed, the grouting pipe is removed, and then the plug is reinstalled.

[0021] (5) The one-way valve used in the application utilizes the check action, and after the grouting pipe is removed, the lubricating material does not backflow, and the lubricating material does not pollute the lining of the non-excavation ductile iron pipe.

[0022] (6) In the application, the flared opening is arranged at the position of the extended pipe end of the concrete protective layer, and the lubricating material is conveniently grouted. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a structural schematic view of the utility model;

[0024] Fig. 2 is a partial schematic view of the application in use;

[0025] Fig. 3 It is the schematic view of the plug of the utility model;

[0026] In the drawing: 1, ductile cast iron pipe; 2, cement lining; 3, concrete protective layer; 4, grouting hole; 5, lengthening pipe; 6, one-way valve; 7, horn mouth; 8, grouting pipe joint; 9, grouting pipe; 10, plug; 101, rubber sealing ring; 11, steel mesh; 12, reinforcing rib; 13, pushing flange. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model. Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meanings by those skilled in the art to which the present disclosure belongs. The "upper", "lower", "left", "right", "front", "rear", "inner", "outer" and the like used in the patent application description and claims of the present disclosure are only used to represent the relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship also changes accordingly. The utility model does not detail, which is the known technology of those skilled in the art.

[0028] As Figs. 1-3 shown, the application provides a kind of trenchless ductile cast iron pipe, it includes ductile cast iron pipe 1 and the cement lining 2 and concrete protective layer 3 respectively arranged in the inside and outside of ductile cast iron pipe 1.The middle part of ductile cast iron pipe 1 is provided with several grouting holes 4, grouting hole 4 is provided with internal thread, the inner diameter of grouting hole 4 is preferably about 3 / 4-1 inch, and the number is preferably 1-3, when the number of grouting hole 4 is multiple, it is evenly arranged along the circumferential direction of ductile cast iron pipe 1.The grouting hole 4 inside thread is installed with the plug 10 of metal material, preferably stainless steel material, rubber sealing ring 101 is provided on plug 10 to increase sealing performance.Ductile cast iron pipe 1 outside is welded with lengthening pipe 5 concentric with grouting hole 4 at grouting hole 4 position, lengthening pipe 5 is preferably stainless steel material, lengthening pipe 5 penetrates concrete protective layer 3, and the inner side of its outer end is provided with internal thread and is installed with one-way valve 6, the one-way valve 6 is used for lubricating material, when lubricating material passes through lengthening pipe 5, under the pressure of lubricating material, one-way valve 6 opens from the inner side of lengthening pipe 5 to the outside, and lubricating material is sent to the outside of pipe. In order to facilitate the delivery of lubricating material, the outer end of lengthening pipe 5 is lower than concrete protective layer 3, and concrete protective layer 3 is provided with horn mouth 7 outside the outer end of lengthening pipe 5.

[0029] In this embodiment, in order to further improve the stability of the pipe, the ductile cast iron pipe 1 is provided with a jacking flange 13 on one side, and a reinforcing rib 12 is arranged between the inside of the jacking flange 13 and the ductile cast iron pipe 1; the reinforcing rib 12 is located inside the concrete protective layer 3, and a steel mesh 11 is arranged inside the concrete protective layer 3, and the steel mesh 11 is connected with the ductile cast iron pipe 1 and the reinforcing rib 12 respectively.

[0030] When manufacturing, before pouring the trenchless ductile cast iron pipe, according to the design requirements, holes (grouting holes 4) are drilled in the pipe body of the ductile cast iron pipe 1, and the inner wall is tapped, the number of holes can be determined according to the effective length of the trenchless ductile cast iron pipe, then the plug 10 is installed, the size of the plug is selected to match the hole diameter of the pipe body, the maximum working pressure of the plug is 315BAR, the appearance and performance of the plug and the sealing ring meet the requirements of DIN 3852-1-2014 “Internal Hexagon Plug Series Standard” and DIN 3869-1994 “Profile Sealing Ring Standard”, the plug is provided with a rubber sealing ring, the material is fluororubber, the hardness is 80-90 Shore hardness; then according to the opening diameter and structural design, the lengthening pipe 5 is welded on the outer wall of the ductile cast iron pipe 1, which serves as a channel for pouring lubricating material, the lengthening pipe 5 keeps the axis line coincident with the axis line of the grouting hole 4, and the wall thickness of the lengthening pipe 5 is not less than 4mm; the end of the lengthening pipe 5 which is not welded is internally tapped, then a suitable rubber plug is used to block it, to prevent concrete from entering the lengthening pipe during pouring of the concrete protective layer of the trenchless ductile cast iron pipe, causing blockage; then the jacking flange 13, the reinforcing rib 12 and the steel mesh 11 are arranged, and the concrete protective layer 3 and the cement lining 2 are constructed; after the trenchless ductile cast iron pipe is poured and cured, the rubber plug used for blocking is removed, the one-way valve 6 is installed, the one-way valve has external threads, which can be screwed into the lengthening pipe with raw material, and the entire trenchless ductile cast iron pipe is completed.

[0031] The trenchless ductile cast iron pipe is used as follows: when the trenchless ductile cast iron pipe needs to be jacked and installed with lubrication and drag reduction, the plug 10 on the inner wall of the pipe is unscrewed, the grouting pipe 9 is connected with the grouting hole 4 through the grouting pipe joint 8, and then grouting operation can be performed through the grouting pipe; the one-way valve 6 on the other side of the lengthening pipe 5 has a check function, and the lubricating material will push the one-way valve 6 outward from the inside under the action of the pressure of the grouting pump, at this time the lubricating material enters the jacking and installation channel of the pipe, and lubricates the outer wall of the trenchless ductile cast iron pipe; when grouting is completed and the pump stops working, the jacking and installation channel of the pipe is filled with lubricating material, and under the action of external pressure, the one-way valve will be closed, avoiding backflow of the lubricating material, which may cause lubrication failure or contamination of the pipe interior, at this time the grouting pipe for conveying lubricating material is removed, and the plug is installed to ensure internal sealing.

Claims

1. A trenchless ductile iron jacking pipe, characterized in that, The system includes a ductile iron pipe (1) and a cement lining (2) and a concrete protective layer (3) respectively disposed on the inner and outer sides of the ductile iron pipe (1). The ductile iron pipe (1) has several grouting holes (4) with internal threads in the middle. A plug (10) is installed in the grouting hole (4). An extension pipe (5) concentric with the grouting hole (4) is fixedly disposed on the outer side of the ductile iron pipe (1) at the position of the grouting hole (4). The extension pipe (5) penetrates the concrete protective layer (3). An internal thread is opened on the inner side of its outer end and a one-way valve (6) is installed.

2. The trenchless ductile iron jacking pipe according to claim 1, characterized in that, There are 3 grouting holes (4), which are evenly arranged along the circumference of the ductile iron pipe (1).

3. The trenchless ductile iron jacking pipe according to claim 1, characterized in that, The inner diameter of the grouting hole (4) is 3 / 4 to 1 inch.

4. The trenchless ductile iron jacking pipe according to claim 1, characterized in that, The end of the extended tube (5) is welded and fixed to the ductile iron tube (1).

5. The trenchless ductile iron jacking pipe according to claim 1, characterized in that, The outer end of the extended pipe (5) is lower than the concrete protective layer (3), and the concrete protective layer (3) has a flared opening (7) outside the outer end of the extended pipe (5).

6. The trenchless ductile iron jacking pipe according to claim 1, characterized in that, A push flange (13) is provided on the outside of one side of the ductile iron pipe (1), and a reinforcing rib (12) is provided between the inside of the push flange (13) and the ductile iron pipe (1).

7. The trenchless ductile iron jacking pipe according to claim 6, characterized in that, The reinforcing rib (12) is located inside the concrete protective layer (3), and a steel mesh (11) is provided inside the concrete protective layer (3). The steel mesh (11) is connected to the ductile iron pipe (1) and the reinforcing rib (12) respectively.

8. The trenchless ductile iron jacking pipe according to claim 1, characterized in that, A rubber sealing ring (101) is provided on the plug (10).

9. A trenchless ductile iron jacking pipe according to claim 1, characterized in that, Both the extension tube (5) and the plug (10) are made of stainless steel.

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