Nodular cast iron jacking pipe inner support hoisting system

Abstract

The invention relates to a nodular cast iron jacking pipe inner support hoisting system which comprises a jacking pipe and a nodular cast iron pipe, the outer wall of the nodular cast iron pipe is additionally provided with a flange and a concrete layer, the nodular cast iron pipe is used for pushing construction, and the inner wall of the jacking pipe is coated with cement mortar which passes through a centrifugal force exceeding 25 G and is centrifugally coated; the lifting appliance extends into the jacking pipe from the interior of the jacking pipe, so that the jacking pipe is vertically transported in the axial direction, and the lifting appliance comprises a sucking disc which is a bowl-shaped component with an elastic body sealing edge on the peripheral side; the driving beam is used for controlling the suction cup to do reciprocating motion in the radial direction of the jacking pipe; the suction cup is connected with the driving beam through the connecting arm; the length of the driving beam for controlling the single suction cup is larger than the radius of the jacking pipe, and the suction cups are adsorbed to the inner wall of the jacking pipe through the internal evacuation technology. The device has the beneficial effects that the mold is hoisted in and out through the jacking pipe, pouring of outer wrapped concrete is completed, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of ductile iron pipe operation equipment, and in particular to a ductile iron top pipe inner support hoisting system. Background Art

[0002] Ductile iron pipe for jacking (referred to as jacking pipe) is a special pipe in trenchless technology. It is necessary to weld a flange on the outer wall of the socket or double-plug / double-spigot ductile iron pipe, use a stiffener or steel cage as aggregate, and apply a layer of cement mortar or fine-grained concrete protective layer to make the overall outer diameter of the pipe body consistent. This is convenient for reducing the surrounding soil pressure during jacking construction, so as to achieve the purpose of completing jacking construction of the socket pipe.

[0003] However, it is usually necessary to coat a thick layer of hardening material on the outer wall, and a mold support structure such as a steel barrel is required to hoist the cast pipe into the mold. For example, in the prior art, a flexible mold and a method of use are mentioned in "A casting tool for ductile iron jacking pipe and its working method" CN108638317A. The time slot for mold removal is to wait until the mortar on the outer wall reaches a greater strength, usually more than 75%. The cast pipe is transported to the next station or outsourced by outsourcing. The above method requires a long time for concrete curing and requires hoisting of the mold, which affects production efficiency. At the same time, frequent hoisting of the mold affects its service life. In addition, the ductile iron jacking pipe coated with water-based epoxy paint mentioned in the document "A ductile iron pipe with a composite anti-corrosion coating and its preparation method" CN104197119B needs to be hoisted after the water-based epoxy paint is completely dried after vertical coating. Moreover, for the sanitation of water supply, it is generally necessary to coat a layer of cement mortar on the inner wall of the pipe. For those skilled in the art, due to the existence of the cement mortar layer, a set of technical solutions for outer wall processing and inner wall hoisting has not yet been formed.

[0004] Therefore, a kind of lifting device that is hoisted through inner wall is in urgent need of. Summary of the invention

[0005] In order to overcome the problem in the prior art that the external packaging / external holding method is used for hoisting after the outer wall is painted, which has a huge impact on the production and processing flow efficiency, the present invention adopts a vacuum adsorption method, and on the basis of the inner wall coated with cement mortar, an internal support form is used to organize the hoisting, and a ductile iron top pipe internal support hoisting system is developed.

[0006] The technical solution adopted by the present invention is: a ductile iron top pipe internal support hoisting system, comprising:

[0007] Jacking pipe, a ductile iron pipe with a flange and a concrete layer on the outer wall for jacking construction, the inner wall of the jacking pipe is coated with cement mortar centrifugally lined by a centrifugal force exceeding 25G;

[0008] A lifting device is a device that extends from the inside of the jacking pipe to transport the jacking pipe vertically along the axial direction, and the lifting device includes:

[0009] The suction cup is bowl-shaped and has an elastic edge-sealed component on its side;

[0010] A driving beam controls the suction cup to reciprocate along the radial direction of the jacking pipe;

[0011] A connecting arm, wherein the suction cup is connected to the driving beam by means of the connecting arm;

[0012] The length of the driving beam controlling a single suction cup is greater than the radius of the jacking pipe, and the suction cup is adsorbed on the inner wall of the jacking pipe through an internal evacuation process.

[0013] Furthermore,

[0014] The suction cup is, as a whole, an arc-shaped structure having the same or similar curve as the inner wall of the top pipe.

[0015] Furthermore,

[0016] The radius range of the jacking pipe hoisted by the hoist is from X to Y, and the arc radius Z of the suction cup is:

[0017] Z=(X+Y) / 2

[0018] in,

[0019] X is the minimum radius of the inner diameter of the jacking pipe for hoisting;

[0020] Y is the maximum radius of the inner diameter of the jacking pipe for hoisting.

[0021] Furthermore, the ductile iron top pipe inner support hoisting system meets the following requirements:

[0022] T<9·10 -6 ·S·K1·K2

[0023] in,

[0024] T is the weight of the jacking pipe, in t;

[0025] S is the suction area of ​​the suction cup, in mm 2 ;

[0026] K1 is the friction coefficient between the elastic body and the inner wall of the top pipe;

[0027] K2 is the number of suction cups;

[0028] P>9·10 -2 ·S / (L·W)

[0029] in,

[0030] P is the strength required for the cement mortar lining of the top pipe to be peeled off from the inner wall of the top pipe, in MPa;

[0031] L is the length of the elastic edge seal provided on the side of the suction cup, in mm;

[0032] W is the width of the elastic edge seal provided around the suction cup, in mm.

[0033] Furthermore,

[0034] The value range of P is 3Mpa to 5Mpa.

[0035] Furthermore,

[0036] The number of the suction cups is more than two;

[0037] The number of the driving beams is equal to the number of the suction cups, and the driving beams are arranged radially with the axis of the jacking pipe as the center.

[0038] Furthermore,

[0039] The angles between two adjacent driven beams are the same.

[0040] Furthermore,

[0041] A lifting lug is fixedly connected to the upper portion of the driving beam;

[0042] The lifting lug is connected to a control device located on the upper side of the lifting device;

[0043] The control device controls the horizontal and vertical movements of the spreader.

[0044] Furthermore,

[0045] The control device is one of a crane, a traveling crane and a traveling crane.

[0046] The beneficial effects of the present invention compared to the prior art are:

[0047] 1) By utilizing the radial movement of the drive beam of the spreader, various specifications of lifting can be realized. One spreader can realize flexible production without changing the spreader.

[0048] 2) Utilize vacuum suction cups to insert from the top without hooking, eliminating the risk of manual hook lifting.

[0049] 3) The interior of the driving beam can be set as a hollow structure to draw negative pressure inside, thereby increasing the speed of vacuuming the suction cup.

[0050] 4) Using vacuum suction cups to contact the inner wall, the outer concrete only needs to meet the initial setting strength, saving steam and mold occupation time.

[0051] 5) The pouring of the outer concrete is completed by lifting the jacking pipe in and out of the mold, thereby improving production efficiency.

[0052] 6) This method reduces the lifting of the mold and increases the service life of the mold.

[0053] 7) This method can realize the fixed-point pouring of concrete, which is convenient for improving the pouring quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a side view of a specific embodiment of the present invention;

[0055] Figure 2 It is a front view of a specific embodiment of the present invention;

[0056] Figure 3 It is a schematic diagram of the expansion state of the suction cup according to the lifting model according to a specific embodiment of the present invention;

[0057] Figure 4 It is a top view schematic diagram of a hanger entering the interior of a top pipe in a specific embodiment of the present invention;

[0058] Figure 5 It is a top view schematic diagram of a hanger entering into a large-diameter jacking pipe according to a specific embodiment of the present invention;

[0059] Figure 6 It is a cross-sectional view of a specific embodiment of the present invention when a lifting device is lifting a jacking pipe in a fitted state;

[0060] The annotations are:

[0061] 100 - jacking pipe; lifting device - 200; driving beam - 210; connecting arm - 220; suction cup - 230; lifting lug - 240. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0063] In order to overcome the problem in the prior art that the hoisting of the outer wall after coating by the outsourcing / outside holding method has a great impact on the production and processing flow efficiency, the present invention adopts the vacuum adsorption method, on the basis of the inner wall coated with cement mortar, and adopts the form of internal support to organize the hoisting, and develops a ductile iron top pipe internal support hoisting system, please refer to Figures 1 to 6 The technical solution adopted in this specific implementation is a ductile iron top pipe internal support hoisting system, including:

[0064] The jacking pipe 100 is a ductile iron pipe with a flange and a concrete layer on the outer wall for jacking construction. The inner wall of the jacking pipe 100 is coated with a cement mortar that is centrifugally lined by a centrifugal force exceeding 25G; please refer to Figure 6 The outer wall of the top pipe 100 has a concrete layer. In the present embodiment, it should be noted that both concrete and mortar are actually hardened layers. In some other embodiments, fiber cement can be used instead. The concrete layer and the mortar layer are both hardened materials with the same function and should be regarded as equivalent technical features. At the same time, in order to ensure the safety of water supply and internal anti-corrosion requirements, the inner wall of the top pipe 100 is usually also provided with a cement mortar layer with a thickness of more than 3 mm. Of course, in various embodiments, the cement mortar layer can also be coated with materials such as high-alumina cement and anti-cracking mortar.

[0065] The hoist 200 is a device that extends from the inside of the jacking pipe 100 to transport the jacking pipe 100 vertically along the axial direction. One of the inventive points of this embodiment is to overcome the prejudice of the prior art. It is generally believed that the interior is coated with cement mortar and does not meet the conditions for hoisting. It is necessary to wait at the work station for the outer wall cement / concrete to have the hoisting strength and complete the hoisting after the formwork is removed. The technical solution of this embodiment is to complete the hoisting and operation by internal support inside.

[0066] The sling 200 comprises:

[0067] The suction cup 230 is bowl-shaped, and has an elastic sealing component on the side thereof; the overall shape of the suction cup 230 can be various, such as oval or rectangular. Figure 1 , a rectangular technical solution is adopted.

[0068] The driving beam 210 controls the suction cup 230 to reciprocate along the radial direction of the jacking pipe 100; the driving beam 210 can also have many structural forms, such as a rail trolley or a linear slide rail refueling cylinder. For those skilled in the art, the form of realizing the driving is easy to realize.

[0069] The connecting arm 220 , the suction cup 230 is connected to the driving beam 210 by means of the connecting arm 220 ; the connecting arm 220 is used to provide support for the suction cup 230 to enter the interior of the jacking pipe 100 .

[0070] The length of the driving beam 210 controlling a single suction cup 230 is greater than the radius of the top pipe 100, and the suction cup 230 is adsorbed on the inner wall of the top pipe 100 through an internal evacuation process. In this embodiment, since the evacuation process is a prior art, it is not shown in the drawings.

[0071] In other embodiments, preferably, in order to reduce the requirement for the compression ratio of the elastic edge sealing around the suction cup 230,

[0072] The suction cup 230 is an arc-shaped structure having the same or similar curve as the inner wall of the top pipe 100. Figure 4 and Figure 5 In this embodiment, since the inner wall of the top pipe 100 is arc-shaped, a suction cup 230 is designed to fit the arc-shaped structure. At the same time, in order to meet the vacuuming process, the elastic body around the suction cup 230 needs to have a larger thickness and compression ratio to achieve a sealing effect.

[0073] In some embodiments, it is preferred to take into account the uniformity achieved in the compression ratio of the elastomer.

[0074] The radius range of the jacking pipe 100 hoisted by the hoist 200 is from X to Y, and the arc radius Z of the suction cup 230 is:

[0075] Z=(X+Y) / 2

[0076] in,

[0077] X is the minimum radius of the inner diameter of the jacking pipe 100 for hoisting;

[0078] Y is the maximum radius of the inner diameter of the jacking pipe 100;

[0079] At the same time, since the inner wall is a cement mortar / concrete layer, the hoisting process must take into account the effect of adsorbing the inner wall while preventing the inner lining from falling off. The following is another inventive concept of this specific implementation method, which limits the overall system to the following conditions. The ductile iron top pipe inner support hoisting system meets the following conditions:

[0080] T<9·10-6·S·K1·K2

[0081] in,

[0082] T is the weight of the jacking pipe 100, in t;

[0083] S is the suction area of ​​the suction cup 230, in mm2;

[0084] K1 is the friction coefficient between the elastic body and the inner wall of the top pipe (100);

[0085] K2 is the number of the suction cups 230;

[0086] P>9·10 -2 ·S / (L·W)

[0087] in,

[0088] P is the strength required for the cement mortar lining of the top pipe to be peeled off from the inner wall of the top pipe, in MPa;

[0089] L is the length of the elastic edge seal provided on the side of the suction cup, in mm;

[0090] W is the width of the elastic edge seal provided on the side of the suction cup, in mm;

[0091] Through a large number of experiments, designers found that under the centrifugal force of 25G,

[0092] The value range of P is 3 MPa to 5 MPa. In some other embodiments, if a binder is added, the value range of P can be increased.

[0093] In other embodiments,

[0094] The number of the suction cups 230 is more than two; see Figure 2 and Figure 3 In this embodiment, the number of suction cups 230 used is two, and in other embodiments, it can also be three, distributed at 120 degrees, or distributed in two opposite groups. This is related to the weight of the top pipe 100 to be hoisted and the area of ​​the suction cup 230.

[0095] The number of the driving beams 210 is equal to the number of the suction cups 230 , and the driving beams 210 are radially arranged with the axis of the jacking pipe 100 as the center.

[0096] In other embodiments, in order to make the adsorption force uniform,

[0097] The angles between two adjacent driven beams 210 are the same. In this embodiment, the angle between the two suction cups 230 is 180 degrees.

[0098] In some embodiments, preferably, in order to achieve the driving and connection of the hoisting,

[0099] The upper portion of the driving beam 210 is fixedly connected with a lifting lug 240;

[0100] The lifting lug 240 is connected to a control device located on the upper side of the lifting device 200;

[0101] The control device controls the horizontal and vertical movements of the hanger 200 .

[0102] Preferably,

[0103] The control device is one of a crane, a traveling crane and a traveling crane.

[0104] During the specific operation: the mold matching the top pipe 100 is arranged vertically, and the control device transports the hoist into the ductile iron pipe to be coated with cement. The suction cup 230 adheres to the inner wall of the ductile iron pipe and generates adsorption force, which is less than the bonding force of the lining cement mortar to ensure that the lining will not fall off. The control device transports the top pipe 100 into the mold, and cement mortar / concrete is added between the mold and the outer wall of the top pipe 100. When the demoulding strength is reached, the top pipe 100 is demoulded according to the production rhythm, and it is not necessary to reach the strength of the outer wall hoisting, and the hoist is used to move to the next processing station.

[0105] The beneficial effects of the present invention compared to the prior art are as follows: 1. Utilizing the radial movement of the driving beam of the sling, various specifications of lifting can be achieved. A sling can realize flexible production without replacing the sling. 2. Utilizing a vacuum suction cup, it is inserted from the top, without the need for hooks, eliminating the risk of manual hook lifting. 3. The interior of the driving beam can be set as a hollow structure, and negative pressure is drawn inside to increase the speed of vacuuming the suction cup. 4. Utilizing the vacuum suction cup to contact the inner wall, the outer packaged concrete only needs to meet the initial setting strength for reverse transportation, saving steam and mold occupation time. 5. The outer packaged concrete is poured by lifting the mold in and out of the jacking pipe, thereby improving production efficiency. 6. This method reduces the lifting of the mold and increases the service life of the mold. 7. This method can achieve fixed-point pouring of concrete, which is convenient for improving the pouring quality.

[0106] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ductile iron top pipe internal support hoisting system, characterized in that: include: A ductile iron pipe (100) with a flange and a concrete layer installed on the outer wall for jacking construction, wherein the inner wall of the jacking pipe (100) is coated with cement mortar centrifugally lined by a centrifugal force exceeding 25G; A lifting device (200) is a device that extends from the inside of the jacking pipe (100) to transport the jacking pipe (100) vertically along the axial direction. The lifting device (200) comprises: The suction cup (230) is bowl-shaped and has an elastic edge-sealed component disposed on its circumference; A driving beam (210) controls the suction cup (230) to reciprocate radially along the jacking pipe (100); A connecting arm (220), wherein the suction cup (230) is connected to the driving beam (210) by means of the connecting arm (220); The length of the driving beam (210) controlling a single suction cup (230) is greater than the radius of the top pipe (100), and the suction cup (230) is adsorbed on the inner wall of the top pipe (100) through an internal evacuation process.

2. According to claim 1, the ductile iron top pipe internal support hoisting system is characterized in that: The suction cup (230) is, as a whole, an arc-shaped structure having the same or similar curve as the inner wall of the top pipe (100).

3. The ductile iron top pipe internal support hoisting system according to claim 2 is characterized in that: The radius range of the jacking pipe (100) hoisted by the hoist (200) is from X to Y, and the arc radius Z of the suction cup (230) is: Z=(X+Y) / 2; in, X is the minimum radius of the inner diameter of the jacking pipe (100) for hoisting; Y is the maximum radius of the inner diameter of the jacking pipe (100) for hoisting.

4. The ductile iron top pipe internal support hoisting system according to claim 1 is characterized in that: The ductile iron top pipe internal support hoisting system meets the following requirements: T<9·10 -6 ·S·K1·K2 in, T is the weight of the jacking pipe (100), in t; S is the suction area of ​​the suction cup (230), in mm 2 ; K1 is the friction coefficient between the elastic body and the inner wall of the top pipe (100); K2 is the number of the suction cups (230); P>9·10 -2 ·S / (L·W) in, P is the strength required for the cement mortar lining the top pipe (100) to be peeled off from the inner wall of the top pipe (100), in MPa; L is the length of the elastic edge seal provided on the circumference of the suction cup (230), in mm; W is the width of the elastic edge seal provided on the circumference of the suction cup (230), in mm.

5. The ductile iron top pipe internal support hoisting system according to claim 4 is characterized in that: The value range of P is 3Mpa to 5Mpa.

6. The ductile iron top pipe internal support hoisting system according to claim 1 is characterized in that: The number of the suction cups (230) is more than two; The number of the driving beams (210) is equal to the number of the suction cups (230), and they are arranged radially with the axis of the jacking pipe (100) as the center.

7. The ductile iron top pipe internal support hoisting system according to claim 6 is characterized in that: The angles between two adjacent driven beams (210) are the same.

8. The ductile iron top pipe internal support hoisting system according to claim 1 is characterized in that: A lifting lug (240) is fixedly connected to the upper portion of the driving beam (210); The lifting lug (240) is connected to a control device located on the upper side of the lifting device (200); The control device controls the horizontal and vertical movements of the sling (200).

9. The ductile iron top pipe internal support hoisting system according to claim 8, characterized in that: The control device is one of a crane, a traveling crane and a traveling crane.

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