A method for pouring concrete for a shield tunnel portal ring beam

Abstract

The application discloses a shield tunnel portal ring beam concrete pouring method, which is characterized by the following steps: embedding a concrete pouring guide pipe in the concrete of the side wall above the tunnel portal ring beam in a station as the only concrete pouring hole, and separating the concrete pouring hole from the vibrating hole to ensure continuous pouring of the concrete; setting a vibrating rod guide channel at the waist and the upper part of the tunnel portal ring beam to effectively vibrate the concrete at the waist and the upper part of the tunnel portal ring beam; and separating the concrete pouring guide pipe from the vibrating rod guide channel, so that the concrete pouring and vibrating can be simultaneously performed. The application can separate the pouring hole from the vibrating hole, ensure continuous pouring of the concrete, prevent segregation of the concrete, compactly vibrate the waist and the top of the ring beam, greatly improve the concrete pouring quality, and reduce the risk of water leakage. Meanwhile, the concrete pump truck is saved, the safety hidden danger caused by the impact force of workers supporting the pump pipe can be avoided, and the difficulty in coordinating the pump truck and the high cost caused by using the pump truck can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building, more particularly, relates to a method for pouring concrete for a metro shield interval portal ring beam. BACKGROUND

[0002] The shield tunnel two ends and the side wall connecting part of the metro station need to be constructed with a portal ring beam. The portal ring beam is divided into two types of built-in and external, and the common built-in structure is used. The built-in portal ring beam is flush with the concrete side wall surface, which is equivalent to being embedded in the side wall, and the embedded width is generally 400mm-800mm, mostly 600mm, and the thickness is greater than 500mm, which is difficult to pour concrete. At present, the existing shield portal ring beam concrete pouring is generally to reserve 3-5 pouring holes from bottom to top at the time of installing the formwork, and the pump pipe of the concrete pump truck is used to pour concrete against the pouring hole, and the pouring hole is often used as a concrete vibrating hole, which has the following defects:

[0003] (1) When pouring concrete, the pouring hole needs to be intermittently blocked, and the concrete pouring needs to be temporarily stopped when the pouring hole is blocked, which leads to discontinuous pouring of concrete, affects the bonding quality between the concretes, and further leads to water leakage, which is difficult to handle;

[0004] (2) When pouring concrete, the pouring hole is often used as a vibrating hole, and the vibrating and pouring are alternately operated, which is difficult to control the construction quality, leads to incomplete vibrating, and often causes water leakage, which is difficult to handle;

[0005] (3) The concrete in the waist and above of the portal ring beam is difficult to vibrate, often missing or not vibrating in place, which leads to water leakage, which is difficult to handle;

[0006] (4) When the pouring hole is insufficient, the concrete in the portal ring beam steel bar is more than 2m in height, which is easy to cause concrete segregation, poor flow, and affect the quality of concrete pouring;

[0007] (5) When pouring concrete, the operator needs to hold the pump pipe on the support, but the pump pipe has a large impact force, and the operator has difficulty in controlling it, which has a safety hazard;

[0008] (6) The required concrete quantity of the portal ring beam is small, the pump truck is difficult to coordinate, and the cost is high, and the residual concrete of the pump pipe after pouring is wasted, which causes higher cost.

[0009] Therefore, in view of the concrete pouring of the portal ring beam, it is necessary to research and invent a new method to ensure the construction quality and safety, overcome the shortcomings of the existing technology, and improve the traditional method. SUMMARY

[0010] Invention purposes: In view of the above technical problems, the present application provides a kind of hole door ring beam concrete pouring method, can realize the separation of pouring hole and vibrating hole, ensure continuous pouring of concrete, prevent concrete segregation, ring beam waist and top vibrating compaction, greatly improve the quality of concrete pouring, reduce the risk of water leakage;At the same time, the concrete pump truck is saved, the safety hazard caused by the impact force of workers needing to support pump pipe can be avoided, and the difficulty of pump truck coordination and the high cost caused by pump truck use can be avoided.

[0011] A kind of shield hole door ring beam concrete pouring method, comprising the following steps:

[0012] S1, making concrete pouring guide pipe

[0013] The lower end of the concrete pouring guide pipe is arranged at the middle top of the hole door ring beam, the upper end vertically passes through the side wall to the top of the top plate, and the concrete pouring guide pipe is arranged in the crown beam and the inner side of the retaining wall.The concrete pouring guide pipe is used as a concrete pouring channel;

[0014] S2, pre-buried vibrating rod guide hole

[0015] The vibrating rod guide hole comprises:

[0016] The first vibrating rod guide hole is pre-set in the concrete pouring guide pipe, and is used for vibrating the concrete at the top of the hole door ring beam.

[0017] The second vibrating rod guide hole is pre-set in the main reinforcement of the hole door ring beam framework and located at the waist of the hole door ring beam, and comprises a plurality of second vibrating rod guide holes vertically arranged in parallel and spaced apart.

[0018] The third vibrating rod guide hole is pre-set in the main reinforcement of the hole door ring beam framework and located between the second vibrating rod guide hole and the top of the hole door ring beam, and comprises a plurality of third vibrating rod guide holes uniformly arranged and spaced apart, and the hole axis of the third vibrating rod guide hole passes through the center of the hole door ring beam.

[0019] The second vibrating rod guide hole and the third vibrating rod guide hole each comprise a pre-buried steel pipe in the wall body and a circular steel channel pre-set in the ring beam reinforcement.

[0020] S3, install concrete feeding hopper and vibrating rod

[0021] After the hole door ring beam reinforcement and formwork are installed and accepted, install the concrete feeding hopper and vibrating rod, install the feeding hopper first, then install the vibrating rod, the feeding port of the concrete feeding hopper is connected and fixed with the upper end of the concrete pouring guide pipe at the top plate, and the vibrating rod enters the top of the hole door ring beam along the first vibrating rod guide hole from the feeding port of the feeding hopper.

[0022] The second vibrating rod guide hole and the third vibrating rod guide hole are used to respectively put in the vibrating rod;

[0023] S4, pouring the concrete of the ring beam of the portal and plugging the pouring guide pipe

[0024] The concrete flows into the ring beam of the portal through the concrete pouring guide pipe, and when the vibrating rod guide hole has the concrete, the vibrating operation is started as the concrete surface in the ring beam of the portal rises;

[0025] The concrete pouring guide pipe is plugged after the concrete is continuously poured into the top of the concrete pouring guide pipe.

[0026] The first buffer guide structure is arranged on the upper and lower sides of the inner wall of the concrete pouring guide pipe in an interval alternation mode, and is used to buffer the concrete, prevent the segregation of the concrete vertically downward, and guide the orderly flow of the concrete.

[0027] The first buffer guide structure is a V-shaped chute.

[0028] The second buffer guide structure is arranged on the upper and lower sides of the waist of the ring beam of the portal in an interval alternation mode, and is used to buffer the falling speed of the concrete, prevent the segregation of the concrete vertically downward, and guide the orderly flow of the concrete.

[0029] The circular steel passage structure in the first vibrating rod guide hole and the second vibrating rod guide hole is the same, and is made of circular steel and steel wire, at least three circular steels are arranged inside, and the steel wire is wound outside the circular steel to form a straight cylindrical spiral hole, and the inner diameter of the hole is 40mm-50mm larger than the outer diameter of the vibrating rod.

[0030] The circular steel passage in the third vibrating rod guide hole is in the shape of a horn mouth, the outer hoop is wound by a steel wire ring with a spacing of 100mm, and at least three skeleton main steels are made of circular steel inside, the spacing between adjacent skeleton main steels is less than the diameter of the vibrating rod, the skeleton main steels are fixed by binding with the spiral hoop, and the skeleton main steels are welded with the concrete pouring guide pipe and the second guide plate.

[0031] When the vertical distance between the ground and the station roof is less than 2m, the ground concrete tank truck directly puts the concrete into the discharging hopper;

[0032] When the vertical distance between the ground and the station roof is more than 2m, a chute or a string barrel is used to put the concrete into the discharging hopper to prevent the segregation of the concrete.

[0033] The inner and outer walls of the concrete pouring guide pipe are treated with rust-proof paint, the top and bottom of the pipe are temporarily blocked when the concrete pouring guide pipe is embedded, and the temporary blockage is opened before pouring the hole ring beam concrete.

[0034] The concrete pouring guide pipe is a square pipe with a side length of 300mm to 400mm;

[0035] The first buffer guide structure is a triangular plate, a plurality of triangular plates are arranged alternately upwards and downwards along the height direction on the inner wall of the concrete pouring guide pipe, the height interval of adjacent two triangular plates is less than 2m, and the triangular plates are welded on the inner wall of the square concrete pouring guide pipe, and the included angle between the first buffer guide structure and the inner wall of the concrete pouring guide pipe is 45°. Advantages

[0036] (1) The hole ring beam concrete pouring method has the advantages that the concrete pouring guide pipe is embedded in the wall body, and is arranged above and outside the hole ring beam, so that the pouring hole is not blocked, the concrete is continuously poured, the continuous pouring quality of the concrete is ensured, and the risk of water leakage is reduced.

[0037] (2) The hole ring beam concrete pouring method has the advantages that the concrete pouring hole is not used as the vibrating hole, the vibrating hole is separately arranged, the concrete vibrating and pouring are simultaneously operated, the concrete is densely vibrated, and the risk of water leakage is reduced.

[0038] (3) The hole ring beam concrete pouring method has the advantages that the first buffer guide plate is arranged in the pouring guide pipe, and the second buffer guide plate is arranged at the waist of the hole ring beam, so that the segregation of the concrete caused by vertical falling is prevented, the concrete flows in an orderly manner, and the pouring quality of the concrete is controlled.

[0039] (4) The hole ring beam concrete pouring method has the advantages that the second vibrating rod guide hole is arranged in the wall body above the waist of the hole ring beam, and the third vibrating rod guide hole is arranged in the steel bar of the upper half of the ring beam, so that the concrete is vibrated, and the risk of water leakage is reduced.

[0040] (5) The hole ring beam concrete pouring method has the advantages that the concrete tank truck directly discharges on the ground, the concrete pouring platform at a high position is omitted, high-position operation is reduced, and the risk of high-position operation is avoided.

[0041] (6) The hole ring beam concrete pouring method has the advantages that the concrete pump truck is omitted, the safety hidden danger caused by the impact force of workers supporting the pump pipe is avoided, the coordination difficulty of the pump truck is avoided, and the high cost caused by the use of the pump truck is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 It is a vertical plane view of the whole structure of the hole ring beam pouring of the side wall of the subway station.

[0043] Wherein, 1 is ground; 2 is retaining wall; 3 is crown beam; 4 is feeding hopper; 5 is roof beam; 6 is concrete pouring guide pipe; 7 is middle plate beam; 8 is first vibrating rod guide hole; 9 is third vibrating rod guide hole; 10 is second vibrating rod guide hole; 11 is second buffer guide structure; 12 is portal ring beam; 13 is underground pile or mast; 14 is station structure side wall; 15 is station structure side wall;

[0044] Figure 2 It is the whole structure section view of pouring portal ring beam of station structure side wall of the present application;

[0045] Wherein, 16 is shield segment;

[0046] Figure 3 It is the schematic diagram of setting second buffer guide structure in the waist of portal ring beam;

[0047] Figure 4 It is Figure 3 3-3 view;

[0048] Figure 5 It is the structural schematic diagram of concrete pouring guide pipe;

[0049] Figure 6 It is Figure 5 2-2 view;

[0050] Figure 7 It is the structural schematic diagram of first vibrating rod guide hole and second vibrating rod guide hole;

[0051] Figure 8 It is Figure 7 transverse section view;

[0052] Wherein, 17 is first skeleton main reinforcement; 18 is straight cylinder spiral steel wire stirrup;

[0053] Figure 9 It is the structural schematic diagram of second vibrating rod guide hole;

[0054] Figure 10 It is Figure 9 transverse section view;

[0055] Wherein, 19 is second skeleton main reinforcement; 20 is horn-shaped spiral steel wire stirrup;

[0056] Figure 11 It is the structural schematic diagram of setting channel structure in the wall above portal ring beam, which is communicated with the second vibrating rod guide hole and third vibrating rod guide hole;

[0057] Wherein, 21 is round steel channel; 22 is portal ring beam peripheral wall. DETAILED DESCRIPTION

[0058] The technical solutions of the present application will be further described in detail below in combination with specific embodiments and the accompanying drawings of the specification.

[0059] The present application provides a shield tunnel portal ring beam concrete pouring method.

[0060] The vibration rod guide hole channel comprises:

[0061] The first vibration rod guide hole 8 is preset in the concrete pouring guide pipe 6 and is used for vibrating the concrete at the top of the portal ring beam.

[0062] The second vibration rod guide hole 10 is preset in the main reinforcement of the portal ring beam framework and is located on both sides of the waist of the portal ring beam.

[0063] The third vibration rod guide hole 9 is preset in the main reinforcement of the portal ring beam framework and is located between the second vibration rod guide hole and the top of the portal ring beam.

[0064] The wall above the portal ring beam is provided with a round steel channel 21 which is in communication with the third vibration rod guide hole 9 and the second vibration rod guide hole 10.

[0065] The present application provides a shield tunnel portal ring beam concrete pouring method.

[0066] S1, making a concrete pouring guide pipe

[0067] The lower end of the concrete pouring guide pipe is arranged at the top of the middle of the portal ring beam, the upper end vertically penetrates the side wall and extends to the top of the top plate, and the concrete pouring guide pipe is arranged in the crown beam and the inner side of the retaining wall.

[0068] S2, presetting a vibration rod guide hole channel

[0069] The vibration rod guide hole channel comprises:

[0070] The first vibration rod guide hole is preset in the concrete pouring guide pipe and is used for vibrating the concrete at the top of the portal ring beam.

[0071] The second vibrating rod guide hole 10 is preset in the main reinforcement of the hole ring beam framework and is located at both sides of the waist of the hole ring beam, and includes a plurality of vertically parallel and spaced second vibrating rod guide holes;

[0072] The third vibrating rod guide hole 9 is preset in the main reinforcement of the hole ring beam framework and is located between the second vibrating rod guide hole and the top of the hole ring beam, and includes a plurality of third vibrating rod guide holes which are uniformly spaced and have hole axes passing through the center of the hole ring beam;

[0073] The second vibrating rod guide hole and the third vibrating rod guide hole each include a pre-buried steel pipe in the wall and a circular steel channel preset in the reinforcement of the ring beam;

[0074] S3, install a concrete feeding hopper and a vibrating rod

[0075] After the hole ring beam reinforcement and the formwork are installed and accepted, a concrete feeding hopper and a vibrating rod are installed, the feeding hopper is installed first, and then the vibrating rod is installed, the feeding opening of the concrete feeding hopper is fixedly connected with the upper end of the concrete pouring guide pipe at the top plate, and the vibrating rod enters the top of the hole ring beam along the first vibrating rod guide hole from the feeding opening of the feeding hopper;

[0076] The vibrating rod is respectively put into the second vibrating rod guide hole and the third vibrating rod guide hole;

[0077] S4, pouring hole ring beam concrete and sealing the pouring guide pipe

[0078] The concrete flows into the hole ring beam through the feeding hopper and the concrete pouring guide pipe, and as the concrete surface in the hole ring beam rises, when the vibrating rod guide hole has concrete, the vibrating operation is started, wherein the vibrating rod is inserted from the third vibrating rod guide hole for vibrating in the upper half ring of the hole ring beam, and the vibrating rod is inserted from the second vibrating rod guide hole for vibrating at both sides of the waist of the hole ring beam;

[0079] The vibrating rod is inserted from the second vibrating rod guide hole for vibrating at both sides of the waist of the hole ring beam;

[0080] When the concrete surface rises to the top of the hole ring beam, the vibrating rod inserted from the first vibrating rod guide hole is used for vibrating;

[0081] The concrete pouring is stopped after the concrete is poured to the top of the concrete pouring guide pipe, and the sealing of the concrete pouring guide pipe is completed.

[0082] As a preferred embodiment of the technical scheme of the present application, the concrete pouring guide pipe is provided with a first buffer guide structure, which is arranged alternately and spacedly on the upper and lower sides of the inner wall of the concrete pouring guide pipe, and is used for buffering the concrete, preventing the concrete from segregating vertically downward, and guiding the orderly flow of the concrete.

[0083] As a preferred embodiment of the technical scheme of the present application, the waist part of the ring beam of the hole portal is provided with a second buffer guide structure, which is arranged alternately and spacedly on the upper and lower sides of the waist part of the ring beam of the hole portal, and is made of a square steel plate, which is welded and fixed with the main reinforcement of the ring beam, and is used for buffering the falling speed of the concrete, preventing the concrete from segregating vertically downward, and guiding the orderly flow of the concrete.

[0084] As a preferred embodiment of the technical scheme of the present application, the concrete pouring guide pipe is a square pipe with a side length of 300mm to 400mm; the first buffer guide structure is a triangular plate, a plurality of triangular plates are arranged alternately and spacedly on the inner wall of the concrete pouring guide pipe in the height direction, the height interval between adjacent two triangular plates is less than 2m, and the triangular plates are welded on the inner wall of the square concrete pouring guide pipe, and the included angle between the first buffer guide structure and the inner wall of the concrete pouring guide pipe is 45°.

[0085] The concrete pouring guide pipe of the present application is square, because the square pipe is easier to process than the round pipe, the round pipe needs to be cut, the first buffer guide structure is connected with the arc of the round pipe, and it is difficult to process and weld, while the square pipe can be made of a steel plate or a thin-wall angle steel, and it is convenient to weld the first buffer guide structure, so the square pipe is used comprehensively.

[0086] The first buffer guide structure uses a V-shaped chute, which is more conducive to the falling of the concrete than a one-word-shaped chute.

[0087] The concrete pouring guide pipe of the present application is provided with a first vibrating rod guide hole, which is made of a round steel, and is conducive to the up-and-down movement of the vibrating rod, the interval between adjacent main reinforcements is less than the diameter of the vibrating rod, so as to prevent the vibrating rod from running out of the vibrating rod guide hole and being stuck during the up-and-down movement or vibration. During the construction of pouring the square pipe and blocking the concrete, the vibrating rod vibrates in the guide hole, and the surrounding concrete is made dense by vibrating the concrete.

[0088] The round steel passage structure of the first vibrating rod guide hole and the second vibrating rod guide hole is the same, which is made of a round steel and a steel wire, at least three round steels are inside, and the steel wire is wound outside the round steel to form a straight cylindrical spiral hole, the inner diameter of which is 40mm to 50mm larger than the outer diameter of the vibrating rod.

[0089] The circular steel channel in the third vibrating rod guide hole is in the shape of a trumpet mouth, the outer stirrup is wound by a wire loop with a spacing of 100 mm, and the inner is not less than three skeleton main reinforcements made of circular steel, the spacing between adjacent skeleton main reinforcements is less than the diameter of the vibrating rod, the skeleton main reinforcement is fixed by binding with the spiral stirrup, and the skeleton main reinforcement is fixed by welding with the concrete pouring guide pipe and the second guide plate.

[0090] Further, when the vertical distance between the ground and the station roof is less than 2 m, the ground concrete tank truck directly pours concrete into the discharging hopper, and when the vertical distance between the ground and the station roof is more than 2 m, a chute or a string drum is used to pour concrete into the discharging hopper to prevent concrete segregation.

[0091] As a preferred embodiment of the technical scheme of the present application, the inner and outer walls of the concrete pouring guide pipe are treated with rust-proof paint, the top and bottom of the pipe are temporarily blocked when the concrete pouring guide pipe is embedded, and the temporary blockage is opened before the concrete pouring of the hole portal ring beam.

[0092] Using the shield hole portal ring beam concrete pouring method of the present application, a discharging hopper is directly installed above the concrete pouring guide pipe, the concrete tank truck can directly pour concrete into the hopper, the use of a concrete pump truck is saved, the safety risk caused by the difficulty of workers in controlling the pump pipe on the platform is avoided, and the pump truck cost is avoided.

Claims

1. A method for pouring concrete for a shield tunnel portal ring beam, characterized in that, The method comprises the following steps: S1, making a concrete pouring guide pipe The lower end of the concrete pouring guide pipe is arranged at the top of the middle of the portal frame, and the upper end vertically penetrates the side wall to the top of the roof, and the concrete pouring guide pipe is arranged in the crown beam and the inner side of the retaining wall as a concrete pouring channel; S2, pre-burying a vibrating rod guide hole The vibrating rod guide hole comprises: A first vibrating rod guide hole is pre-buried in the concrete pouring guide pipe and used for vibrating the concrete at the top of the portal frame to the top of the portal frame; A second vibrating rod guide hole is pre-buried in the main reinforcement of the portal frame skeleton and located at both sides of the waist of the portal frame, and comprises a plurality of second vibrating rod guide holes vertically and parallelly arranged at intervals; A third vibrating rod guide hole is pre-buried in the main reinforcement of the portal frame skeleton and located between the second vibrating rod guide hole and the top of the portal frame, and comprises a plurality of third vibrating rod guide holes uniformly arranged at intervals and having hole axes penetrating the center of the portal frame; The second vibrating rod guide hole and the third vibrating rod guide hole each comprise a steel pipe pre-buried in the wall and a round steel channel pre-buried in the reinforcement of the portal frame; S3, installing a concrete feeding hopper and a vibrating rod After the portal frame reinforcement and the formwork are installed and accepted, the concrete feeding hopper and the vibrating rod are installed, the feeding hopper is installed first, and then the vibrating rod is installed, the feeding opening of the concrete feeding hopper is fixedly connected with the upper end of the concrete pouring guide pipe at the top of the roof, and the vibrating rod enters the top of the portal frame along the first vibrating rod guide hole from the feeding opening of the feeding hopper; The vibrating rod is respectively put through the second vibrating rod guide hole and the third vibrating rod guide hole; S4, pouring concrete into the portal frame and sealing the pouring guide pipe The concrete flows into the portal frame through the concrete pouring guide pipe, and the vibrating operation is started when the vibrating rod guide hole is filled with concrete; The concrete pouring guide pipe is sealed after the concrete is continuously poured to the top of the concrete pouring guide pipe.

2. The method according to claim 1, wherein, The first buffer guide structure is arranged at intervals and alternately on the upper and lower sides of the inner wall of the concrete pouring guide pipe, and is used for buffering the concrete, preventing the vertical segregation of the concrete, and guiding the orderly flow of the concrete.

3. The method according to claim 2, wherein, The first buffer guide structure is a V-shaped chute.

4. The method according to claim 2, wherein, The second buffer guide structure is arranged at intervals and alternately on the upper and lower sides of the waist of the portal frame, and is used for buffering the falling speed of the concrete, preventing the vertical segregation of the concrete, and guiding the orderly flow of the concrete.

5. The method according to claim 3, wherein, The round steel channel structure of the first vibrating rod guide hole and the second vibrating rod guide hole is the same, and is made of round steel and steel wire, at least three round steels are arranged inside, and the steel wire is wound outside the round steel to form a spiral channel, and the inner diameter of the spiral channel is 40mm-50mm larger than the outer diameter of the vibrating rod. The circular steel channel in the third vibrating rod guide hole is in the shape of a trumpet mouth, the outer stirrup is wound with a wire coil with a spacing of 100 mm, and the inner part is made of at least three skeleton main reinforcements made of circular steel, the spacing between adjacent skeleton main reinforcements is less than the diameter of the vibrating rod, the skeleton main reinforcements are fixed by binding with the spiral stirrups, and the skeleton main reinforcements are welded and fixed with the concrete pouring guide pipe and the second guide plate.

6. The shield portal ring beam concrete pouring method according to claim 1, characterized in that, When the vertical distance between the ground and the station roof is less than 2 m, the ground concrete tank truck directly pours concrete into the lower hopper; When the vertical distance between the ground and the station roof is more than 2 m, a chute or a string drum is used to pour concrete into the lower hopper to prevent concrete segregation.

7. The method according to claim 1, wherein, The inner and outer walls of the concrete pouring guide pipe are treated with rust-proof paint, the pipe top and bottom are temporarily sealed when the concrete pouring guide pipe is embedded, and the temporary seal is opened before the portal ring beam concrete pouring.

8. The shield portal ring beam concrete pouring method according to claim 2, characterized in that, The concrete pouring guide pipe is a square guide pipe with a side length of 300 mm to 400 mm; The first buffer guide structure is a triangular plate, a plurality of triangular plates are arranged alternately up and down along the height direction on the inner wall of the concrete pouring guide pipe, the height spacing between adjacent two triangular plates is less than 2 m, and the triangular plates are welded on the inner wall of the square concrete pouring guide pipe, and the included angle between the first buffer guide structure and the inner wall of the concrete pouring guide pipe is 45°.

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