A steel cage and a method for manufacturing the same

Abstract

The present invention proposes a steel cage, which relates to the field of building materials, and specifically to a steel cage and an assembly method thereof, including a steel cage, main bars and end pile hoops, wherein the steel cage is provided with main bars, and the two ends of the main bars are respectively connected to the end pile hoops; the steel cage includes longitudinal bars and annular bars; and a connector for fixing the end pile hoops is provided between the end pile hoops and the steel cage. The main bars of the present invention do not need to be welded to the annular bars, which reduces the mechanical loss of the main bars due to welding during the steel cage forming process, and reduces the difficulty of operation and labor intensity of workers; at the same time, the end plate used in the present invention has no waist-shaped holes, and there is no need to transfer the main bars behind the pier head to the small holes through the waist-shaped holes. The main bars behind the pier head can be directly inserted into the countersunk holes in the end plate, which is simple to operate.

Description

Technical Field

[0001] The present invention relates to the field of building materials, and in particular to a steel cage and a manufacturing method thereof. Background Art

[0002] At present, in the domestic production of prestressed piles, the internal reinforcement cage generally uses a number of steel bars evenly distributed along a full circle or square. Using roll welding equipment, thinner diameter cold-drawn steel wire is welded to the steel bars in a spiral form to form ring bars, which in turn form a complete reinforcement cage with a certain degree of rigidity. During production, the internal steel bars are used for tensioning to form prestress in the longitudinal direction of the reinforcement cage. This production process uses the principle of resistance welding of cold-drawn steel wire and steel bars, sacrificing their own materials to heat-melt them into one to complete the welding. This process will cause a certain degree of mechanical loss to both the main steel bars that bear tensile stress and the ring bars that bear bending moment. In addition, due to the error in the spacing between the main bars of the reinforcement cage, the installation of end plates at both ends requires a high level of worker proficiency and the labor intensity is relatively high.

[0003] Chinese invention patent application No. 201610348264.5, filed May 24, 2016, entitled "Quick and Accurate Connection and Processing Formwork for Cylindrical Reinforcement Cages and Method for Making Reinforcement Cages," discloses a method for making a rebar cage. The method involves placing cage rings on an operating platform at intervals of 2 meters. The main rebar of the cage is then positioned over the positioning rebar. Reinforcement rebar is welded to the outer ring of the cage. The main rebar is then welded to the extension rebar using a fixture that matches the spacing of the main rebar. The cage is then completed. Most existing methods use this method to produce rebar cages, welding the main rebar to the ring rebar to form the cage. However, cages made using this method sacrifice material from the main rebar by welding it to the ring rebar, resulting in structural damage.

[0004] Chinese utility model patent No. 201020208492.0, filed on May 27, 2010, titled "A Prestressed Pull-Out Resistant Concrete Pipe Pile," discloses an end plate with waist-shaped holes uniformly distributed throughout. Prestressed reinforcement bars are connected to these holes using conventional pier-head riveting. This method requires the main reinforcement bars to be passed through the large holes and then transferred to the smaller holes through the waist-shaped holes. This method is complex and labor-intensive. Summary of the Invention

[0005] The present invention proposes a new steel cage forming and assembling process, which eliminates the mechanical loss of main reinforcement due to welding during the steel cage forming process and reduces the operation difficulty and labor intensity of workers.

[0006] A steel cage comprises a steel cage, main bars and end pile hoops, wherein the main bars are arranged in the steel cage, and both ends of the main bars are respectively connected to the end pile hoops; the steel cage comprises longitudinal bars and annular bars; and a connecting piece for fixing the end pile hoops is arranged between the end pile hoops and the steel cage.

[0007] Preferably, the number of the longitudinal ribs is 4-10.

[0008] Preferably, the main reinforcement is arranged through the steel cage.

[0009] Preferably, the connecting piece is a section I steel cage, the steel cage is a section II steel cage, and the cross-sectional area of ​​the section II steel cage is larger than that of the section I steel cage.

[0010] Preferably, the connecting piece is a binding wire.

[0011] Preferably, the end pile hoop comprises a hoop skin and an end plate, and the end plate is provided with a tensioning bolt hole and a countersunk hole.

[0012] Preferably, the tensioning bolt holes and the countersunk holes are evenly spaced and cocentrically arranged.

[0013] Preferably, the cross section of the steel cage is square or circular.

[0014] A method for manufacturing the steel cage comprises the following steps:

[0015] (1) Longitudinal reinforcement and annular reinforcement (forming a reinforcement cage;

[0016] (2) The main reinforcement is arranged in the reinforcement cage, and the main reinforcement has no pier heads at both ends;

[0017] (3) The main reinforcement is connected to the end pile hoop;

[0018] (4) Main reinforcement pier head.

[0019] A method for manufacturing the steel cage comprises the following steps:

[0020] (1) The longitudinal reinforcement and the annular reinforcement are formed into a section I steel cage and a section II steel cage, respectively, wherein the cross section of the section II steel cage is larger than the cross section of the section I steel cage;

[0021] (2) Inserting the section I steel cage into the end of the section II steel cage, the section I steel cage 1 and the section II steel cage together form a steel cage;

[0022] (3) One end of the main reinforcement is inserted into the end pile hoop, and the main reinforcement has a pier head at one end and no pier head at the other end;

[0023] (4) The main reinforcement is set in the reinforcement cage;

[0024] (5) The other end of the main reinforcement is inserted into the end pile hoop;

[0025] (6) Pull the steel cage of section I to both ends;

[0026] (7) Main reinforcement pier head.

[0027] Beneficial effects

[0028] The present invention proposes a steel cage in which the main reinforcement does not need to be welded to the ring reinforcement, thereby reducing the mechanical loss of the main reinforcement due to welding during the steel cage forming process and reducing the operation difficulty and labor intensity of workers; at the same time, the end plate used in the present invention has no waist-shaped hole, and there is no need to transfer the main reinforcement behind the pier head to the small hole through the waist-shaped hole. The main reinforcement behind the pier head can be directly inserted into the countersunk hole in the end plate, which is simple to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the steel cage in Section I;

[0030] Figure 2 This is the schematic diagram of the steel cage in Section II;

[0031] Figure 3 for Figure 1 or Figure 2 A longitudinal section of

[0032] Figure 4 It is a structural diagram of the end plate in the end pile hoop;

[0033] Figure 5 It is a side view of the end pile hoop;

[0034] Figure 6 This is a schematic diagram of the pier head assembly on one side of the main reinforcement;

[0035] Figure 7 This is a schematic diagram of the assembly of the main reinforcement double-sided pier heads;

[0036] Figure 8 This is a schematic diagram of the completed steel cage assembly;

[0037] Figure 9 for Figure 8 Schematic diagram of the cross section A;

[0038] Figure 10 for Figure 8 Another structural diagram of section A.

[0039] The numbers in the figure mean: 1. Section I steel cage; 101. Longitudinal reinforcement; 102. Annular reinforcement; 2. Section II steel cage; 3. End plate; 4. Tensioning bolt hole; 5. Countersunk hole; 6. Hoop skin; 7. End pile hoop; 8. Main reinforcement; 9. Pier head. DETAILED DESCRIPTION

[0040] like Figure 1 and Figure 3 The following are a schematic diagram and a longitudinal cross-section of a section of a steel cage, respectively. Five to six steel wires with a diameter of 3 to 6 mm are used as longitudinal reinforcement 101, and steel wires of similar diameter are used as annular reinforcement 102. The annular reinforcement 102 is welded to the longitudinal reinforcement 101 using a roll welding machine to form the section 1 steel cage 1.

[0041] like Figure 2 and Figure 3 The following diagrams show a schematic diagram and a longitudinal cross-section of Section II's cage, respectively. Five to six steel wires with a diameter of 6-10 mm serve as longitudinal bars 101, while steel wires of similar diameter serve as annular bars 102. These annular bars 102 are welded to the longitudinal bars 101 using a roll welding machine to form Section II's cage 2. The cross-sectional area of ​​Section II's cage 2 is larger than that of Section I's cage 1, allowing it to be nested within it and allowing it to telescope within it. Section I's cage 1 is located at each end of Section II's cage 2.

[0042] like Figure 4 and Figure 5 Figure 2 shows a schematic diagram of the structure of the inner end plate of the end pile collar and a side view of the end pile collar. The end pile collar 7 comprises two parts: the end plate 3 and the collar skin 6. The end plate 3 is hollow, with tensioning bolt holes 4 and countersunk holes 5 arranged concentrically and spaced apart. The tensioning bolt holes 4 are through-holes, and the countersunk holes 5 are provided with a stepped surface, dividing the countersunk holes 5 into two parts. This results in a smaller cross-sectional area near the collar skin 6 than the part away from the collar skin 6.

[0043] like Figure 6-8 , a method for assembling a steel cage, comprising the following steps:

[0044] (1) Using a roll welding device, 5-6 steel wires with a diameter of 4-6 mm are used as longitudinal reinforcement 101, and steel wires of similar diameter are used as annular reinforcement 102, and roll welding is performed to form a section of steel cage 1;

[0045] (2) Using a roll welding device, 5-6 steel wires with a diameter of 6-10 mm are used as longitudinal reinforcement 101, and steel wires with a similar diameter are used as annular reinforcement 102, and roll welding is performed to form a section II steel cage 2; the cross section of the section II steel cage 2 is larger than the cross section of the section I steel cage 1;

[0046] (3) Inserting the I-section steel cage 1 into the II-section steel cage 2 at both ends, respectively. The I-section steel cage 1 can freely expand and contract within the II-section steel cage 2. The I-section steel cage 1 and the II-section steel cage 2 together form a steel cage;

[0047] (4) Place the end pile hoop 7 at both ends of the steel cage. When the main reinforcement 8 has a pier head at one end and no pier head at the other end, use several main reinforcements 8 at the end without pier heads to pass through the countersunk holes 5 on the end pile hoop 7, and move the end pile hoop 7 along the main reinforcement 8 to the end with the pier head.

[0048] (5) Insert the main reinforcement 8 into the steel cage, and insert the other end of the pile hoop 7 and the pier head at the other end of the main reinforcement 8 without the pier head, so that the end of the main reinforcement 8 becomes thicker;

[0049] (6) Move the end pile hoop 7 to both ends so that the main reinforcement 8 is inserted into the countersunk hole 5;

[0050] (7) Move each section of the steel cage 1 to the end and tie the main reinforcement 8 to the steel cage to prevent it from moving back;

[0051] (8) The steel cage and the end pile hoop 7 form a complete assembly and are hoisted into the mold.

[0052] In particular, in the above step (4), the main reinforcement 8 may also be provided with no capping at both ends. In this case, in step (5), the two ends of the main reinforcement 8 need to be capped separately.

[0053] The steel cage obtained through the above steps is shown in the schematic diagram. Figure 8 and Figure 9 As shown, the reinforcement cage is welded from longitudinal bars 101 and annular bars 102. Main bars 8 pass through the cage and connect to the end pile hoops 7 at each end. The reinforcement cage is a combination of a first section cage 1 and a second section cage 2. The second section cage 2 has a larger cross-sectional area than the first section cage 1, allowing the first section cage 1 to be nested within the second section cage 2.

[0054] The steel cage can be Figure 9 The circle shown can also be Figure 10 The square shown.

[0055] The reinforcement cage and the end pile hoop 7 can also be connected by tying steel wires.

Claims

1. A steel cage, characterized in that: The invention comprises a steel cage, a main bar (8) and an end pile hoop (7), wherein the main bar (8) is arranged in the steel cage, and the two ends of the main bar (8) are respectively connected to the end pile hoop (7); the steel cage comprises longitudinal bars (101) and annular bars (102); a connecting piece for fixing the end pile hoop (7) is arranged between the end pile hoop (7) and the steel cage; the main bar (8) is arranged through the steel cage; the longitudinal bars (101) and the annular bars (102) are respectively formed into a section I steel cage (1) and a section II steel cage (2), wherein the cross-sectional area of ​​the section II steel cage (2) is larger than that of the section I steel cage (1); the end pile hoop (7) comprises a hoop skin (6) and an end plate (3), wherein the end plate (3) is provided with a tension bolt hole (4) and a countersunk hole (5); the tension bolt hole (4) and the countersunk hole (5) are evenly arranged at the same center.

2. The steel cage according to claim 1, characterized in that: The number of the longitudinal reinforcements (101) is 4-10.

3. The steel cage according to claim 1, characterized in that: The connecting piece is a tying steel wire.

4. The steel cage according to claim 1, characterized in that: The cross section of the steel cage is square or circular.

5. A method for manufacturing a steel cage as claimed in any one of claims 1 to 4, comprising the following steps: (1) The longitudinal reinforcement (101) and the annular reinforcement (102) are formed into a reinforcement cage; (2) The main reinforcement (8) is arranged in the reinforcement cage, and the main reinforcement (8) has no pier heads at both ends; (3) The main reinforcement (8) is connected to the end pile hoop (7); (4) Main reinforcement (8) Pier head.

6. A method for manufacturing a steel cage as claimed in any one of claims 1 to 4, comprising the following steps: (1) The longitudinal reinforcement (101) and the annular reinforcement (102) are respectively formed into a section I reinforcement cage (1) and a section II reinforcement cage (2), wherein the cross-section of the section II reinforcement cage (2) is larger than the cross-section of the section I reinforcement cage 1; (2) inserting the section I steel cage (1) into the end of the section II steel cage (2), wherein the section I steel cage (1) and the section II steel cage (2) together form a steel cage; (3) One end of the main reinforcement (8) is inserted into the end pile sleeve (7), wherein the main reinforcement (8) has a pier head at one end and no pier head at the other end; (4) The main reinforcement (8) is arranged in the reinforcement cage; (5) The other end of the main reinforcement (8) is inserted into the end pile hoop (7); (6) Pull the steel cage (1) of section I to both ends respectively; (7) Main reinforcement (8) Pier head.

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