Vertical hook type combined closed stirrup and construction method thereof

Abstract

The invention belongs to the technical field of steel bar construction in a reinforced concrete structure, and provides a vertical hook type combined closed stirrup and a construction method thereof, the combined closed stirrup comprises an open stirrup and a short tie bar; first hooks are formed at the two ends of the open stirrup and bent in the direction perpendicular to the plane where the open stirrup is located, second hooks are formed at the two ends of the short tie bar, and the second hooks at the two ends of the short tie bar are connected with the first hooks at the two ends of the open stirrup in a hooked mode, so that the open stirrup and the short tie bar jointly form the closed stirrup. Wherein the first hook is bent in the direction perpendicular to the plane where the opening stirrup is located, so that the corner longitudinal bar is parallel to and tightly abuts against the bent face of the first hook, direct binding can be achieved, and the construction procedure is simple and convenient; the second hooks at the two ends of the short tie bar can be directly hooked with the first hooks at the two ends of the open stirrup, so that the construction is simple and feasible; and the first hook, the second hook and the corner longitudinal bar are bound together, so that the connection tightness of the open stirrup and the short tie bar is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steel bar construction in reinforced concrete structures, and particularly relates to a vertical hook-type combined closed stirrup and a construction method thereof. Background Art

[0002] At present, the composite slab technology is widely used in the construction of reinforced concrete prefabricated buildings. However, during the construction of the composite slab, there is a construction difficulty that the construction process of the upper longitudinal reinforcement of the beam and the anchor reinforcement of the end of the composite slab interfere with each other. No matter which one is constructed first, it will affect the construction of the other. This is mainly because the anchor reinforcement of the end of the composite slab is designed to be located below the upper longitudinal reinforcement of the beam, but is perpendicular to the upper longitudinal reinforcement of the beam in direction. Therefore, it is difficult to install the anchor reinforcement of the composite slab into the beam. This construction sequence contradiction can be divided into the following two situations:

[0003] 1. Construction of combined structure of prefabricated composite slab and cast-in-place beam

[0004] See also Figure 1 If the prefabricated composite slab 8 is hoisted first and then the beam reinforcement 10 is constructed, the anchor bars 9 at the ends of the composite slab 8 will extend into the beam and occupy the space inside the beam, interfering with the subsequent construction of the beam reinforcement 10; and because the stirrups are in a closed state, the method of tying the beam longitudinal reinforcement later will make it difficult for the longitudinal reinforcement to penetrate the closed and fixed stirrups, which is time-consuming and laborious. If the beam reinforcement 10 is constructed first and then the composite slab 8 is hoisted, the anchor bars 9 at the ends of the composite slab 8 cannot be inserted into the beam normally (put under the upper longitudinal reinforcement of the beam) when the composite slab 8 is hoisted, because the anchor bars 9 of the composite slab 8 are above the upper longitudinal reinforcement of the beam and perpendicular to it during hoisting.

[0005] There are currently two main ways to solve this problem. The first solution is to construct the beam reinforcement first and then hoist the composite plate. However, after the beam reinforcement construction is completed, the beam reinforcement needs to be lifted to a certain height as a whole to facilitate the insertion of its end anchor bars 9 into the beam when the composite plate 8 is hoisted; after the composite plate is hoisted, the beam reinforcement is lowered as a whole, and then its position and spacing are fine-tuned. The advantage of this method is that it is simple and easy to operate, and only requires a slight change in the construction method, but the disadvantage is that it has a certain impact on the quality of the beam reinforcement construction, and its scope of application is limited: it can be used for generally smaller beams when the overall weight of the beam reinforcement is not large; when the beam is larger, the overall weight of the beam reinforcement is larger and the overall rigidity is large, and lifting and lowering are not feasible.

[0006] The second solution is to change the stirrup design of the beam and use combined closed stirrups. Figure 2, so the construction sequence can be changed to: first tie the lower beam steel bars 11 and the lower open stirrups 12; then hoist the composite plate 8, and the anchor bars 9 can be directly placed in the beam; finally tie the upper beam longitudinal bars and the upper closed stirrups 13 (short tension bars). The advantage of this method is that it can avoid the interference between the binding of the upper beam steel bars and the hoisting of the anchor bars 9 of the composite plate into the beam, and the construction is carried out from bottom to top in the order of structural levels, eliminating the contradiction in the construction sequence; but the disadvantage is that the construction of the longitudinal bars at the corners of the upper beam is more difficult, and the longitudinal bars of the beam here must be placed in the hooks of the lower open stirrups 12 and the hooks of the upper closed stirrups 13 at the same time, which makes the construction operation inconvenient; in addition, if the hook is large and the space bent into the beam is long, it will also affect the construction of other longitudinal bars.

[0007] 2. Construction of combined structure of prefabricated composite slabs and prefabricated composite beams

[0008] Usually, the composite beams are hoisted first and then the composite slabs, and then the upper longitudinal reinforcement of the beams is constructed. However, since the stirrups of the composite beams have been closed and fixed at this time, the upper longitudinal reinforcement of the beams must be inserted into the stirrups one by one from the beginning and then tied, which makes the construction extremely difficult.

[0009] A common method to solve this problem is to use combined closed stirrups, see Figure 3 The stirrups of the prefabricated part of the composite beam 14 are open stirrups. After the composite plate 8 is hoisted in place, the upper longitudinal reinforcement of the beam and the upper closed stirrups (short tension bars) are installed respectively to reduce the difficulty of longitudinal reinforcement construction caused by conventional closed stirrups. This method is the same as the second solution mentioned above, the difference is that the beam is changed from cast-in-place to prefabricated, and its advantages and disadvantages are the same. Summary of the invention

[0010] In view of the shortcomings of the prior art, the present invention provides a vertical hook-type combined closed stirrup and a construction method thereof, and forms a new combined closed stirrup and a corresponding new reinforcement construction method by improving the design of the combined closed stirrup of the assembled beam. The purpose is to reduce the construction difficulty of the beam reinforcement in the assembled structure construction, mainly to solve the process contradiction between the anchoring reinforcement of the composite plate and the construction of the longitudinal reinforcement on the upper part of the beam; at the same time, solve the problem of the inconvenience of the construction of the longitudinal reinforcement at the corner in the conventional combined closed stirrup.

[0011] In addition, in other structures with a large number of stirrups in the design section, when conventional closed stirrups are difficult to construct or stirrups need to be added later, the vertical bent hook type combined closed stirrups of the present invention can also be partially used.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] In one aspect, the present invention provides a vertical hook-type combined closed stirrup, comprising an open stirrup and a short tie bar;

[0014] Both ends of the open stirrup are formed with a first hook, which is bent in a direction perpendicular to the plane where the open stirrup is located. Both ends of the short tension bar are formed with a second hook, and the second hooks at both ends of the short tension bar are respectively hooked with the first hooks at both ends of the open stirrup, so that the open stirrup and the short tension bar together constitute a closed stirrup.

[0015] Preferably, the short tie rod is parallel to the plane where the open stirrup is located, and the second hooks at both ends of the short tie rod are bent towards each other.

[0016] Preferably, the bending angle of the first hook is 135°-180°.

[0017] Preferably, the bending angle of the second hook is 135°-180°.

[0018] Preferably, it also includes lower longitudinal reinforcement, which is perpendicular to the open stirrups and is tied and fixed.

[0019] Preferably, it also includes upper longitudinal reinforcement, and the upper longitudinal reinforcement located in the middle is perpendicular to the short tension reinforcement and is tied and fixed.

[0020] Preferably, the upper longitudinal reinforcement located at the corner is tied and fixed to the second hook and the first hook at the same time.

[0021] On the other hand, the present invention provides a construction method of vertical hook-type combined closed stirrups, comprising the following steps:

[0022] S1. Tie the lower longitudinal reinforcement and open stirrups;

[0023] S2. Install the upper longitudinal reinforcement:

[0024] placing the upper longitudinal reinforcement at the designed position within the structural member and providing temporary support measures for the upper longitudinal reinforcement;

[0025] S3. Install short tie bars for closure;

[0026] Firstly, the second hooks at both ends of the short tie bars are respectively hooked with the first hooks at both ends of the open stirrups;

[0027] Then tie and fix the second hook, the first hook and the upper longitudinal reinforcement at the corner, and strengthen the tie at the intersection of the three if necessary;

[0028] Finally, the upper longitudinal reinforcement located in the middle is tied and fixed to the short tension reinforcement, and the temporary support measures are removed.

[0029] Preferably, in step S3, the second hook is hooked to the first hook in the area enclosed by the stirrups.

[0030] Preferably, in step S3, the second hook is hooked to the first hook outside the area enclosed by the stirrups.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The present invention provides a vertical hook-type combined closed stirrup and a construction method thereof, wherein the open stirrup and the lower steel bars of the beam are first tied and constructed, then the composite plate is hoisted, and finally the short tie bars and the upper steel bars of the beam are constructed; in this way, the beam steel bars can be divided into an upper and lower layer for separate construction, and the composite plate is installed in between; the problem of mutual interference between the construction procedures of the installation of the upper longitudinal bars of the beam and the installation of the anchor steel bars at the end of the composite plate is solved.

[0033] 2. The present invention provides a vertical hook-type combined closed stirrup and a construction method thereof, wherein the end hook of the open stirrup does not bend into the stirrup plane (parallel to the beam cross section), but bends in a direction perpendicular to the stirrup plane (longitudinal plane of the beam) to form a first hook. In this way, the longitudinal reinforcement (frame reinforcement) at the corner of the beam is parallel and close to the bending surface of the first hook, so it can be directly tied thereto; compared with the open stirrups in the conventional combined closed stirrups, the problem of the longitudinal reinforcement at the corner of the beam being placed into the hooks of the lower open stirrup and the upper open stirrup at the same time is avoided, which not only reduces the construction difficulty, but also reduces the process of threading the steel bars. The second hook of the short tie bar can be directly hooked with the bending part of the first hook and tied together with the longitudinal reinforcement, with a good overall effect; the construction operation can be made simpler and easier without reducing the connection tightness between the stirrups and between the stirrups and the longitudinal reinforcement.

[0034] 3. The present invention provides a vertical hook-type combined closed stirrup and a construction method thereof. By increasing the angles of the first hook and the second hook, the connection tightness between the open stirrup and the short tension bar can be increased, and the connection integrity between the stirrup and the longitudinal bar can be increased. When the stirrup spacing remains unchanged, by increasing the angle of the first hook, the gap spacing between the hooks of each open stirrup in the beam can be increased to reduce the difficulty of placing the anchor steel bars when the composite plate is hoisted. Because the first hook is perpendicular to the anchor steel bars of the composite plate, the anchor steel bars must be placed into the beam from the gaps between the first hooks of each open stirrup during hoisting.

[0035] 4. The present invention provides a vertical hook-type combined closed stirrup and a construction method thereof, wherein the open stirrup and the short tension bar are both open in form and can be constructed together with the longitudinal reinforcement or after the longitudinal reinforcement is installed, so the construction sequence is flexible; the overlap of the hook and the longitudinal reinforcement is also flexible; the hooks of the two parts in the combination can be directly hooked to each other, and the tightness is also strong; therefore, in other structures with a large number of stirrup limbs in the design section, the construction difficulty problem caused by the large number of stirrup limbs can be solved, and the time-consuming and labor-intensive process problem when stirrups need to be added later can also be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the construction conditions of the composite slab and cast-in-place beam in the prior art;

[0037] Figure 2 It is a schematic diagram of the construction condition of a beam using combined closed stirrups in the prior art;

[0038] Figure 3 It is a schematic diagram of the construction condition of a composite beam using combined closed stirrups in the prior art;

[0039] Figure 4 A schematic diagram of the three-dimensional structure of an open stirrup of a vertical hook-type combined closed stirrup provided in an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the three-dimensional structure of a short tie bar of a vertical hook-type combined closed stirrup provided in an embodiment of the present invention;

[0041] Figure 6 A schematic diagram of a three-dimensional structure of an open stirrup of a vertical hook-type combined closed stirrup and a lower longitudinal reinforcement tied thereto provided by an embodiment of the present invention;

[0042] Figure 7 A schematic diagram of a three-dimensional structure of a vertical hook-type combined closed stirrup with short tie bars tied downwards provided in an embodiment of the present invention;

[0043] Figure 8 A schematic diagram of a three-dimensional structure of a vertical hook-type combined closed stirrup with short reinforcing bars tied upwards provided by an embodiment of the present invention;

[0044] Fig. 9 A schematic diagram of the front view structure of a vertical hook-type combined closed stirrup provided by an embodiment of the present invention, wherein the short tie bars are tied upward and downward in two ways;

[0045] Fig.10 A schematic diagram of the three-dimensional structure of a composite beam with vertical hook-type combined closed stirrups provided in an embodiment of the present invention;

[0046] Fig.11 A schematic diagram of the three-dimensional structure of a composite beam with vertical hook-type combined closed stirrups after short tension bars and upper longitudinal bars are tied, provided in an embodiment of the present invention.

[0047] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0048] 1. Precast composite beam; 2. Open stirrups; 3. First hook; 4. Short tie bars; 5. Second hook; 6. Upper longitudinal bars; 7. Lower longitudinal bars; 8. Composite slab; 9. Anchor bars; 10. Beam reinforcement; 11. Lower reinforcement; 12. Lower open stirrups; 13. Upper closed stirrups; 14. Composite beam. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0050] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For ordinary technicians in this field, the specific meanings of such terms in this patent can be understood according to specific circumstances.

[0051] Example 1

[0052] During the construction of conventional combined closed stirrups, the construction of the corner longitudinal reinforcement is more difficult. This is because the corner longitudinal reinforcement needs to be placed in the hooks of the open stirrups and the short tension bars at the same time to ensure that the open stirrups and the short tension bars form a complete closed stirrup. The construction is inconvenient, time-consuming and labor-intensive.

[0053] In order to solve the above problems, the present embodiment improves the design of conventional combined closed stirrups to form a new combined closed stirrup and a corresponding new reinforcement construction method to reduce the construction difficulty.

[0054] This embodiment takes the construction of beam reinforcement as an example and provides a vertical hook-type combined closed stirrup, including a lower open stirrup 2 and a short tie rod 4.

[0055] For details, see Figure 4-7 The open stirrup 2 is a U-shaped structure, the open stirrup 2 is located in a predetermined plane, and first hooks 3 are provided at both ends of the open stirrup 2. The first hooks 3 do not bend in the plane where the open stirrup 2 is located (parallel to the beam cross section), but bend in a direction away from the plane where the open stirrup 2 is located. The first hook 3 and the open stirrup 2 can be an integrated structure, and it can also be understood that the end of the open stirrup 2 is bent in a direction perpendicular to the plane where the open stirrup 2 is located, thereby forming the first hook 3.

[0056] The short tie bar 4 is used to close the open stirrup 2. Second hooks 5 are formed at both ends of the short tie bar 4. The short tie bar 4 is parallel to the plane where the open stirrup 2 is located, and the two second hooks 5 are bent in opposite directions and have parallel bending surfaces. The second hook 5 and the short tie bar 4 can be an integrated structure, and it can also be understood that the ends of the short tie bar 4 are bent toward each other to form the second hook 5.

[0057] The second hooks 5 at both ends of the short reinforcement 4 are respectively hooked with the first hooks 3 at both ends of the open stirrup 2, so that the open stirrup 2 and the short reinforcement 4 together constitute a closed stirrup, and the open stirrup 2 and the short reinforcement 4 can be directly connected through two hooks.

[0058] Based on the above structure, the vertical hook-type combined closed stirrups provided in this embodiment are bent in a direction perpendicular to the plane where the open stirrups 2 are located, instead of being bent in the plane where the open stirrups 2 are located, because the first hooks 3 at both ends of the open stirrups 2 are bent in a direction perpendicular to the plane where the open stirrups 2 are located. In this way, the longitudinal reinforcement at the corner of the beam is parallel and close to the bending surface of the first hook 3, so it can be directly tied with the first hook 3, making the construction easier and simpler, and there is no need to pass the longitudinal reinforcement at the corner of the beam through the first hook 3, which greatly reduces the construction difficulty, reduces the construction process, and saves construction time.

[0059] Compared with the conventional beam combined closed stirrups, the lower open stirrups and the upper open stirrups need to be connected by hooking the corner longitudinal reinforcement together; in this embodiment, the first hook 3 can be directly hooked with the second hook 5, that is to say, the open stirrup 2 is directly connected to the short tension reinforcement 4, and then tied together with the corner longitudinal reinforcement after connection. Therefore, without reducing the tightness of the connection between the stirrups and the stirrups, and between the stirrups and the frame reinforcement, the construction operation is simpler and more convenient.

[0060] In this embodiment, the angles of the first hook 3 and the second hook 5 are both 135°-180°, and the length of the straight section of the hook is generally not less than 5d, and not less than the anchorage length requirement of the stirrup hook in the specification. The hook angle is adjusted according to the stirrup spacing and the connection tightness requirements.

[0061] It should be noted that the bending angles of the first hook 3 and the second hook 5 usually refer to the outer supplementary angles of the hooks (i.e., the hook includes a curved section and front and rear straight sections at both ends of the curved section, and the outer angle between the front and rear straight sections is the supplementary angle).

[0062] See also Figure 7 The vertical hook-type combined closed stirrup provided in this embodiment also includes an upper longitudinal reinforcement 6 and a lower longitudinal reinforcement 7; the lower longitudinal reinforcement 7 is perpendicular to the plane where the open stirrup 2 is located, and the open stirrup 2 usually needs to be pre-tied and fixed with the lower longitudinal reinforcement 7. After the upper longitudinal reinforcement 6 is placed in a predetermined position, the short tension reinforcement 4 is installed in sequence. The upper longitudinal reinforcement 6 located at the corners of both sides is tied and fixed with the second hook 5 and the first hook 3 at the same time, and the upper longitudinal reinforcement 6 located in the middle is directly tied and fixed with the short tension reinforcement 4 vertically.

[0063] Example 2

[0064] For the construction of a combined structure of prefabricated composite slabs and cast-in-place beams, this embodiment provides a construction method of vertical hook-type combined closed stirrups, comprising the following steps:

[0065] S1. Construction of lower reinforcement of cast-in-place beam: Tie lower longitudinal reinforcement 7 and open stirrup 2, see Figure 6 ;

[0066] S2, hoisting the composite plate, although the anchor steel bar at the end of the composite plate is perpendicular to the plane where the first hook 3 is located, since the first hook 3 has a certain elasticity and there are gaps between the first hooks 3 in the beam, the anchor steel bar of the composite plate can be smoothly put into the beam through the gap between the first hooks 3;

[0067] Then, the upper longitudinal reinforcement 6 is installed, the upper longitudinal reinforcement 6 is placed at the designed position in the structural member, and temporary support measures are provided under the upper longitudinal reinforcement 6;

[0068] S3. Install short tie rod 4:

[0069] First, hook the second hooks 5 at both ends of the short tie bars 4 with the bending parts of the first hooks 3 at both ends of the open stirrups 2 respectively;

[0070] Then tie and fix the second hook 5, the first hook 3, and the upper longitudinal reinforcement 6 at the corner;

[0071] Finally, the upper longitudinal reinforcement 6 and the short tension reinforcement 4 in the middle are tied and fixed, and the temporary support measures are removed to complete the construction.

[0072] In step S3, the second hook 5 can be hooked with the first hook 3 toward the area enclosed by the stirrups, that is, the second hook 5 is enclosed from top to bottom, see Figure 7 It should be noted that the second hook 5 includes a front straight section, a curved section, and a rear straight section connected in sequence, the front straight section is connected to the short tie rod 4, and the area closed by the stirrups refers to the rear straight section of the second hook 5 being within the closed plane area formed by the combined closed stirrups.

[0073] The second hook 5 can also be hooked with the first hook 3 outside the area enclosed by the stirrup, that is, the second hook 5 is hooked from the inside of the bending part of the first hook 3 to the outside, see Figure 8 It should be noted that the second hook 5 includes a front straight section, a curved section, and a rear straight section connected in sequence, the front straight section is connected to the short tie rod 4, and the area outside the closed area of ​​the stirrups means that the rear straight section of the second hook 5 is outside the closed plane area formed by the combined closed stirrups.

[0074] For a comparison of the above two methods, see Fig. 9 , can be selected according to the actual construction environment, and the construction is more flexible.

[0075] In this embodiment, the bending angle of the first hook 3 is 135°-180°, and the length of the straight section of the hook is generally not less than 5d, and not less than the anchoring length requirement of the stirrup hook in the specification. The angle of the first hook 3 is adjusted according to the spacing between the stirrups and the connection tightness requirements. For example, if the spacing between the open stirrups 2 is small, the angle of the first hook 3 can be increased to increase the gap distance between the hooks, so that the anchoring steel bars are placed in the beam from the gaps between the hooks of the open stirrups when the composite plate is hoisted. In addition, the angle of the first hook 3 is increased, and the connection tightness between the open stirrups 2 and the short tie bars 4 can also be increased.

[0076] The bending angle of the second hook 5 is 135°-180°, and the length of the straight section of the hook is generally not less than 5d, and not less than the anchoring length requirement of the stirrup hook in the specification. The angle of the second hook 5 is adjusted according to the requirements of the construction difficulty and the connection tightness. For example, the larger the angle of the second hook 5, the greater the difficulty of installing the short tie bar 4, but the stronger the connection tightness between it and the open stirrup 2.

[0077] Based on the above structure, the vertical hook-type combined closed stirrups provided in this embodiment are divided into open stirrups 2 and short tie bars 4. The open stirrups 2 and the lower steel bars of the beam are first tied and constructed, and then the composite plate is hoisted, and finally the short tie bars 4 and the upper steel bars of the beam are constructed; in this way, the beam steel bars are divided into an upper and lower layer and constructed separately, and the composite plate is installed in the middle; the problem of mutual interference between the construction processes of installing the upper longitudinal bars of the beam and the installation of the anchor steel bars at the end of the composite plate is solved.

[0078] In addition, since the first hooks 3 at both ends of the open stirrup 2 do not bend in the plane where the open stirrup 2 is located, but bend in a direction perpendicular to the plane where the open stirrup 2 is located, the corner longitudinal reinforcement can be parallel to the curved surface of the first hook 3 and close together, so it can be directly tied, which is easier; there is no need to pass the corner longitudinal reinforcement through the first hook 3, which greatly reduces the construction difficulty, reduces the construction process, and saves construction time.

[0079] Example 3

[0080] For the construction of a combined structure of a prefabricated composite slab and a prefabricated composite beam, this embodiment provides a construction method of a vertical hook-type combined closed stirrup, comprising the following steps:

[0081] S1. Prefabricated composite beams are then hoisted on site: the reinforcement of the prefabricated part of the composite beam only includes the lower longitudinal reinforcement 7 and the open stirrups 2. The open stirrups 2 are arranged in parallel at a certain distance in the beam. The upper part of the cast prefabricated beam and the first hook 3 are exposed outside the concrete surface. Fig.10 ; After the prefabricated beams are completed, the prefabricated composite beams are hoisted at the construction site;

[0082] S2. Hoisting the composite plate: Although the anchoring steel bar at the end of the composite plate is perpendicular to the plane where the first hook 3 is located, since the first hook 3 has a certain elasticity and there are gaps between the first hooks 3 in the beam, the anchoring steel bar of the composite plate can be smoothly placed into the beam through the gap between the first hooks 3;

[0083] Then, the upper longitudinal reinforcement 6 is installed, the upper longitudinal reinforcement 6 is placed at the designed position in the structural member, and temporary support measures are provided under the upper longitudinal reinforcement 6;

[0084] S3. Install short tie rod 4:

[0085] First, hook the second hooks 5 at both ends of the short tie bars 4 with the bending parts of the first hooks 3 at both ends of the open stirrups 2 respectively;

[0086] Then tie and fix the second hook 5, the first hook 3, and the upper longitudinal reinforcement 6 at the corner;

[0087] Finally, the upper longitudinal reinforcement 6 and the short tension reinforcement 4 in the middle are tied and fixed, and the temporary support measures are removed to complete the construction.

[0088] Among them, in step S3, the short tension bar 4 can hook the second hook 5 with the first hook 3 toward the area closed by the stirrups, that is, the second hook 5 is closed from top to bottom, and the second hook 5 hooks the first hook 3 and the upper longitudinal bar 6 located at the corner at the same time.

[0089] The short tension bar 4 can also hook the second hook 5 with the first hook 3 outside the area closed by the stirrup, that is, hook the second hook 5 from the inside of the bending part of the first hook 3 to the outside, thereby closing the stirrup.

[0090] The above two sealing methods can be selected according to the actual construction environment, making the construction more flexible.

[0091] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.

[0092] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions 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 direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0093] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vertical hook-type combined closed stirrup, characterized in that: It comprises open stirrups (2) and short tie bars (4); Both ends of the open stirrup (2) are formed with a first hook (3), the first hook (3) is bent in a direction perpendicular to the plane where the open stirrup (2) is located, and both ends of the short tension bar (4) are formed with a second hook (5), the second hooks (5) at both ends of the short tension bar (4) are respectively hooked with the first hooks (3) at both ends of the open stirrup (2), so that the open stirrup (2) and the short tension bar (4) together constitute a closed stirrup.

2. A vertical hook-type combined closed stirrup according to claim 1, characterized in that: The short tie bars (4) are parallel to the plane where the open stirrups (2) are located, and the second hooks (5) at both ends of the short tie bars (4) are bent towards each other.

3. A vertical hook-type combined closed stirrup according to claim 1, characterized in that: The bending angle of the first hook (3) is 135°-180°.

4. A vertical hook-type combined closed stirrup according to claim 1, characterized in that: The bending angle of the second hook (5) is 135°-180°.

5. The vertical hook-type combined closed stirrup according to claim 1, characterized in that: It also includes lower longitudinal reinforcement (7), which is perpendicular to the open stirrup (2) and is tied and fixed.

6. A vertical hook-type combined closed stirrup according to claim 1, characterized in that: It also includes an upper longitudinal reinforcement (6), wherein the upper longitudinal reinforcement (6) located in the middle is perpendicular to the short tension reinforcement (4) and is tied and fixed.

7. A vertical hook-type combined closed stirrup according to claim 6, characterized in that: The upper longitudinal reinforcement (6) located at the corner is simultaneously tied and fixed to the second hook (5) and the first hook (3).

8. A construction method for vertical hook-type combined closed stirrups as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1, tying the lower longitudinal reinforcement (7) and the open stirrups (2); S2. Install the upper longitudinal reinforcement (6): placing the upper longitudinal reinforcement (6) at the designed position in the structural member and providing temporary support measures for the upper longitudinal reinforcement (6); S3, installing the short tie rods (4) for closing; Firstly, the second hooks (5) at both ends of the short tie bars (4) are respectively hooked with the first hooks (3) at both ends of the open stirrups (2); Then the second hook (5), the first hook (3) and the upper longitudinal reinforcement (6) at the corner are tied and fixed, and if necessary, the tying can be strengthened at the intersection of the three; Finally, the upper longitudinal reinforcement (6) located in the middle is tied and fixed to the short tension reinforcement (4), and the temporary support measures are removed.

9. A construction method for vertical hook-type combined closed stirrups according to claim 8, characterized in that: In step S3, the second hook (5) is hooked to the first hook (3) in the area enclosed by the stirrups.

10. The construction method of vertical hook-type combined closed stirrup according to claim 8, characterized in that: In step S3, the second hook (5) is hooked to the first hook (3) outside the area enclosed by the stirrups.

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