Support-free detachable fixed formwork application structure applied to assembly type structural system

Abstract

The utility model discloses a support-free detachable fixed template application structure applied to an assembly type structural system, which comprises a prefabricated truss reinforced concrete lower chord member, a floor slab prefabricated layer, more than one group of connecting supports and through fixing bolts, the connecting supports are arranged on the two sides of the prefabricated truss reinforced concrete lower chord side by side, a space used for pouring the truss reinforced concrete upper chord is formed between the opposite connecting supports, the connecting supports are installed on the prefabricated truss reinforced concrete lower chord through oppositely-penetrating fixing bolts, and the floor slab prefabricated layer is connected to the upper portions of the connecting supports in a lap joint mode. By the adoption of the method, a part of or even all scaffolds can be omitted, and the detachable standard connecting support designed in the utility model can be used as a temporary support of a main beam cast-in-place part side mold and a floor slab at the same time, and is fixed on a main beam prefabricated part through a split bolt; and the split fixing bolts in the cast-in-place height range can be accurately positioned according to the width requirement and support is formed.

Description

Technical Field

[0001] This utility model discloses a building structure, and in particular a supportless, detachable, and fixed template application structure used in prefabricated structural systems, belonging to the field of building construction structure technology. Background Technology

[0002] The cross-section of frame beams is generally rectangular or T-shaped. When the floor structure is a precast slab assembly floor, in order to reduce the height occupied by the structure and increase the building clearance, the cross-section of frame beams is often cross-shaped or basket-shaped. In precast monolithic frame structures, precast beams are often made into T-shaped cross-sections. After the precast slabs are installed in place, some concrete is poured again, which forms the so-called composite beam.

[0003] Composite beams are beams that are poured with concrete in two stages. The first stage involves making precast beams at the prefabrication yard; the second stage is carried out on the construction site. After the precast beams are hoisted and placed, the upper concrete is poured to connect them into a whole.

[0004] In the existing technology, during the construction of conventional composite beam structures, scaffolding is required to support the reinforced concrete formwork, especially the formwork under the internal components of the slab, so as to facilitate the pouring of the upper cast-in-place part. After it solidifies, the scaffolding and other supporting structures are dismantled. The whole process is time-consuming and labor-intensive, and the rent or land occupation fee for scaffolding and other supporting structures must be borne. Summary of the Invention

[0005] In view of the shortcomings of the existing composite beams mentioned above, which require scaffolding to support the reinforced concrete formwork during construction, this utility model provides a support-free detachable fixed formwork application structure for prefabricated structural systems. It uses detachable standard connecting supports as temporary supports for the side formwork and floor slab of the cast-in-place part, which can reduce the reliance on scaffolding during the pouring process and can eliminate some or even all of the scaffolding.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a support-free detachable fixed template application structure used in prefabricated structural systems. The structure includes a precast reinforced concrete lower chord of a truss, a precast floor slab, connecting supports, and through-fixing bolts. There are more than one set of connecting supports, and each set of connecting supports is arranged side by side on both sides of the precast reinforced concrete lower chord of the truss. A space for pouring the reinforced concrete upper chord of the truss is formed between the opposite connecting supports. The connecting supports are installed on the precast reinforced concrete lower chord of the truss by through-fixing bolts, and the precast floor slab overlaps on top of the connecting supports.

[0007] The technical solution adopted by this utility model to solve its technical problem further includes:

[0008] The connecting support includes a connecting support body, side support plates, and a top support plate. There is one or more side support plates, which are fixedly installed on the outside of the connecting support body. The side support plates are arranged in parallel. The top support plate is fixedly installed on the top of the connecting support body. There is one or more bolt holes on the connecting support body for inserting through bolts.

[0009] The connecting support body is provided with stiffening strips on its exterior.

[0010] The stiffening strips are provided corresponding to the bolt holes.

[0011] The through-fixing bolt includes a screw and a nut. The screw has threads at both ends, and the nut is installed on the screw threads.

[0012] The nut has an internal thread that corresponds to the screw thread. The nut has external threads on one or both sides, and the bolt holes on the connecting support have internal threads.

[0013] The precast truss reinforced concrete lower chord has open stirrups arranged in parallel on its cross-section. There are one or more sets of open stirrups, and the lower half of each open stirrup is located inside the precast truss reinforced concrete lower chord. There is one or more rows of bottom beam reinforcement bars along the length of the precast truss reinforced concrete lower chord, and each row has one or more columns of bottom beam reinforcement bars. There is one or more rows of web reinforcement bars in the middle of the open stirrups, and each row has one or more columns of web reinforcement bars. There is one or more rows of continuous top beam reinforcement bars at the top of the open stirrups, and each row has one or more columns of continuous top beam reinforcement bars.

[0014] At the location of the large opening on the precast truss reinforced concrete lower chord, a longitudinal reinforcement bar is provided along the length of the precast truss reinforced concrete lower chord. There are at least one longitudinal reinforcement bar above and below the location of the large opening.

[0015] One or more sets of opening reinforcement stirrups are provided at the location of the large opening on the precast truss reinforced concrete lower chord. The opening reinforcement stirrups are set around the large opening and are set parallel to the opening stirrups.

[0016] The beneficial effects of this utility model are: the method of this utility model can eliminate some or even all of the scaffolding. The detachable standard connecting support designed in this utility model can also serve as a temporary support for the side formwork of the cast-in-place main beam and the floor slab. It is fixed to the precast part of the main beam by tie bolts, and the tie bolts within the cast-in-place height range can be accurately positioned and form a support according to the width requirements.

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a partial structural diagram of Embodiment 1 of the present utility model. Figure 8 (Part AA).

[0019] Figure 2 This is a schematic diagram of the prefabricated composite beam structure in Embodiment 1 of this utility model.

[0020] Figure 3 This is a partial structural diagram of Embodiment 2 of the present invention. Figure 8 (Part BB in the middle).

[0021] Figure 4 This is a schematic diagram of the prefabricated composite beam structure in Embodiment 2 of this utility model.

[0022] Figure 5 This is a partial structural diagram of Embodiment 3 of the present utility model. Figure 8 (CC section).

[0023] Figure 6 This is a schematic diagram of the prefabricated composite beam structure in Embodiment 3 of this utility model.

[0024] Figure 7 This is a front view schematic diagram of the connecting support structure in this utility model.

[0025] Figure 8 This is a front view schematic diagram of the composite beam structure in this utility model.

[0026] Figure 9 This is a schematic diagram of the through-bolt structure in this utility model.

[0027] Figure 10 This is a schematic diagram of the bolt rod structure in this utility model.

[0028] Figure 11 This is a schematic diagram of the sleeve structure in this utility model.

[0029] Figure 12 This is a schematic diagram of the nut part in this utility model.

[0030] Figure 13 This is a schematic diagram of the through-bolt connection part in this utility model.

[0031] In the diagram, 1-Precast truss reinforced concrete bottom chord, 11-Open stirrup, 12-Closed stirrup hook, 13-Beam bottom reinforcement, 14-Beam web reinforcement, 15-Beam top continuous reinforcement, 16-Opening reinforcement, 17-Opening reinforcement stirrup, 2-Truss reinforced concrete top chord, 3-Precast floor slab, 4-Cast-in-place floor slab, 5-Connecting support, 51-Connecting support body, 52-Side support plate, 53-Top support plate, 54-Stiffening strip, 55-Bolt hole, 6-Through bolt, 61-Threaded rod, 62-Sleeve, 63-Nut, 64-Threaded rod thread, 65-Nut internal thread, 66-Nut external thread, 7-Beam reserved reinforcement portion. Detailed Implementation

[0032] This embodiment is a preferred embodiment of the present invention. All other embodiments that are the same as or similar to this embodiment in principle and basic structure are within the protection scope of the present invention.

[0033] Please refer to the appendix for details. Figure 1 To be continued Figure 13 This utility model mainly protects a support-free, detachable, and fixed template application structure used in prefabricated structural systems. The structure mainly includes a precast reinforced concrete lower chord 1, a precast floor slab 3, connecting supports 5, and through-bolts 6. There are one or more sets of connecting supports 5, and each set of connecting supports 5 is arranged side by side on both sides of the precast reinforced concrete lower chord 1. A space for pouring the reinforced concrete upper chord 2 of the truss is formed between the opposite connecting supports 5. The connecting supports 5 are installed on the precast reinforced concrete lower chord 1 by the through-bolts 6, and the precast floor slab 3 overlaps on top of the connecting supports 5.

[0034] In this embodiment, the connecting support 5 includes a connecting support body 51, side support plates 52, and a top support plate 53. The connecting support body 51 is flat, and in specific implementation, the specific shape of the connecting support body 51 can be specifically set according to the external shape of the composite beam. There is one or more side support plates 52, and the specific number can be set as needed. The side support plates 52 are fixedly installed on the outside of the connecting support body 51, and the side support plates 52 are arranged in parallel. The top support plate 53 is fixedly installed on the top of the connecting support body 51. The connecting support body 51 has one or more bolt holes 55 for inserting through-bolts 6, preferably arranged in a matrix. In this embodiment, stiffening strips 54 are provided on the outside of the connecting support body 51 to increase the overall strength of the connecting support 5.

[0035] Please refer to the appendix carefully. Figure 7 , attached Figure 7The document describes a specific structure of a connecting support 5, wherein four side support plates 52 are provided, which are evenly and parallelly distributed on the outside of the connecting support body 51. A row of bolt holes 55 is formed at the middle position of adjacent side support plates 52, with each row containing three bolt holes 55. In specific implementations, two or more rows of bolt holes 55 may also be formed at the middle position of adjacent side support plates 52, or two or more side support plates 52 may be provided between adjacent bolt holes 55. In this embodiment, three rows (according to...) are formed on one connecting support 5. Figure 7 Three columns (in the vertical direction) Figure 7 There are nine bolt holes 55 in total (horizontal direction). In actual implementation, one hole may be provided depending on the actual needs. When providing bolt holes, at least one row of bolt holes 55 should correspond to the precast reinforced concrete lower chord 1 of the truss to ensure that the connecting support 5 can be installed together with the precast reinforced concrete lower chord 1 of the truss. In this embodiment, three stiffening bars 54 are provided, which are arranged horizontally and parallel to each other, and the stiffening bars 54 are provided corresponding to the bolt holes 55.

[0036] In this embodiment, the through-fixing bolt 6 includes a screw 61 and a nut 63. The screw 61 has screw threads 64 at both ends, and the nut 63 is installed on the screw threads 64.

[0037] In this embodiment, the nut 63 has an internal thread 65, which corresponds to the screw thread 64. During installation, the internal thread 65 and the screw thread 64 are screwed together to achieve a threaded connection between the screw 61 and the nut 63. In this embodiment, the nut 63 has an external thread 66 on one or both sides, and the bolt hole 55 on the connecting support 5 has an internal thread (not shown in the figure). During installation, the external thread 66 and the internal thread of the bolt hole are screwed together to achieve a threaded connection between the nut 63 and the connecting support 5.

[0038] When the through-fixing bolt 6 is installed corresponding to the precast reinforced concrete lower chord 1 of the truss, a through hole is reserved on the precast reinforced concrete lower chord 1, and the bolt 61 is inserted into the through hole; when the through-fixing bolt 6 is installed corresponding to the reinforced concrete upper chord 2 of the truss, a sleeve 62 is provided between the opposite connecting supports 5, and the bolt 61 is inserted into the sleeve 62. The length of the sleeve 62 is the same as the width of the reinforced concrete upper chord 2 of the truss.

[0039] In this embodiment, the composite beam has two large openings for equipment pipelines or ventilation to pass through. The cross-section of the composite beam differs slightly for the conventional section, at the location of the large openings, and between the large openings. These differences will be described in detail below with reference to the accompanying drawings:

[0040] Example 1: Please refer to the attached document. Figure 1 and attached Figure 2 This corresponds to the appendix Figure 8 The AA section, i.e., the conventional section, includes open stirrups 11 arranged parallel to the cross-section of the precast reinforced concrete lower chord 1 of the truss. The top of the open stirrups 11 is open; in this embodiment, the top of the open stirrups 11 is closed by a rear-closing stirrup hook 12. In practice, the opening at the top of the open stirrups 11 may not be closed, or the open stirrups 11 may be directly closed stirrups. There are one or more sets of open stirrups 11, all arranged in parallel. The lower half of the open stirrups 11 is located within the precast reinforced concrete lower chord 1 of the truss, the middle part of the open stirrups 11 corresponds to the reinforced concrete upper chord 2 of the truss, and the top of the open stirrups 11 corresponds to the precast floor slab 3 and the cast-in-place floor slab 4. One or more rows of bottom beam reinforcement bars 13 are arranged along the length of the precast reinforced concrete lower chord 1 of the truss, with one or more columns of bottom beam reinforcement bars 13 in each row. In this embodiment, there are three rows and nine columns of bottom beam reinforcement bars 13. In practice, the specific number of bottom beam reinforcement bars 13 can be adjusted according to actual conditions. One or more rows of beam web reinforcement 14 are provided in the middle of the open stirrup 11, with one or more columns of beam web reinforcement 14 in each row. In this embodiment, the beam web reinforcement 14 is provided in two rows and two columns. In specific implementation, the specific number of beam web reinforcement 14 can also be set according to the actual situation. One or more rows of beam top continuous reinforcement 15 are provided at the top of the open stirrup 11, with one or more columns of beam top continuous reinforcement 15 in each row. In this embodiment, the beam top continuous reinforcement 15 is provided in one row and four columns. In specific implementation, the specific number of beam top continuous reinforcement 15 can also be set according to the actual situation.

[0041] Example 2: Please refer to the appendix. Figure 3 and attached Figure 4 This corresponds to the appendix Figure 8 The BB section, i.e. the structure at the location of the large opening, has the same basic structure as in Embodiment 1. Corresponding to the location of the large opening, a longitudinal reinforcing bar 16 is provided along the length of the precast truss reinforced concrete lower chord 1. There are one or more longitudinal reinforcing bars 16 above and below the location of the large opening. In this embodiment, four longitudinal reinforcing bars 16 are provided above and below the location of the large opening. In specific implementation, the specific number of longitudinal reinforcing bars 16 can also be set according to the actual situation.

[0042] In this embodiment, one or more sets of opening reinforcement stirrups 17 are provided at the location of the large opening. The opening reinforcement stirrups 17 are provided around the large opening and are arranged parallel to the opening stirrups 11.

[0043] Example 3: Please refer to the appendix for details. Figure 5 and attached Figure 6 This corresponds to the appendix Figure 8The CC part, i.e. the structure at the position between the large holes, has the same basic structure as the structure in Embodiment 1. Corresponding to the position of the large hole opening, a reinforcing longitudinal bar 16 for the opening is provided along the length direction of the precast truss reinforced concrete lower chord 1. There are more than one reinforcing longitudinal bar 16 above and below the position of the large hole opening. In this embodiment, there are four reinforcing longitudinal bars 16 above and below the position of the large hole opening. In specific implementation, the specific number of reinforcing longitudinal bars 16 can also be set according to the actual situation.

[0044] In this embodiment, the precast truss reinforced concrete lower chord 1 is provided with precast truss steel vertical web members on the left and right sides of the large opening, and there are more than one precast truss steel vertical web member on the left and right sides of the large opening. In this embodiment, there are four precast truss steel vertical web members on the left and right sides of the large opening. In specific implementation, the specific number of precast truss steel vertical web members can also be set according to the actual situation.

[0045] In this embodiment, a precast truss reinforced concrete lower chord 1 is provided on the upper side of the large opening, and a precast truss reinforced concrete upper chord 1 is provided on the lower side of the large opening. One or more precast truss reinforced upper chords and one precast truss reinforced lower chord are provided on the upper and lower sides of the large opening. In this embodiment, six precast truss reinforced upper chords and six precast truss reinforced lower chords are provided on the upper and lower sides of the large opening. In actual implementation, the specific number of precast truss reinforced upper chords and precast truss reinforced lower chords can be set according to the actual situation.

[0046] The above-mentioned method for implementing the support-free, detachable, and fixed formwork application structure in prefabricated structural systems includes the following steps:

[0047] Step S1: Fabricate the precast reinforced concrete lower chord 1 of the truss: Fabricate the precast reinforced concrete lower chord 1 of the truss at the fabrication site. During the fabrication process, a through hole is reserved for the through fixing bolt 6 to pass through.

[0048] Step S2, Install connecting support 5: Install connecting support 5 side by side on the precast truss reinforced concrete lower chord 1 using through fixing bolts 6;

[0049] Step S3: Install sleeve 62: Place sleeve 62 between the opposing connecting supports 5. Pass screw 61 through the connecting support 5 and sleeve 62, and install nuts 63 at both ends of screw 61. The internal thread 65 on the nut 63 mates with the thread 64 on the screw 61. When the nut 63 is installed to the bottom position, the external thread 66 on the nut 63 mates with the internal thread of the bolt hole 55 on the connecting support 5, thus fixing the nut 63 onto the connecting support 5. Due to the length limitation of sleeve 62, the width between the opposing connecting supports 5 is exactly the width of the cast-in-place portion of the composite beam.

[0050] Step S4: Hoisting the lower chord: Hoist the precast reinforced concrete lower chord 1 of the truss with the connecting support 5 onto the column;

[0051] Step S5: Hoisting the floor slab: Hoist the precast floor slab 3 onto the precast truss reinforced concrete lower chord 1, so that it overlaps with the top support plate 53 of the connecting support 5;

[0052] Step S6, Pouring: Pouring the cast-in-place portion of the composite beam (i.e., the reinforced concrete upper chord 2 of the truss) and the cast-in-place floor slab 4;

[0053] Step S7: Remove connecting support 5: Loosen nut 63, pull out screw 61, remove connecting support 5, and leave sleeve 62 inside the reinforced concrete upper chord 2 of the truss.

[0054] The method of this utility model can eliminate some or even all of the scaffolding. The detachable standard connecting support designed in this utility model can also serve as a temporary support for the side formwork of the cast-in-place main beam and the floor slab. It is fixed to the precast part of the main beam by tie bolts, and the tie bolts within the cast-in-place height range can be precisely positioned and form a support according to the width requirements.

Claims

1. A support-free, detachable, and fixed formwork application structure for prefabricated structural systems, characterized by: The structure includes a precast reinforced concrete lower chord (1), a precast floor slab (3), connecting supports (5) and through-fixing bolts (6). There are more than one set of connecting supports (5), and each set of connecting supports (5) is arranged side by side on both sides of the precast reinforced concrete lower chord (1). A space for casting the reinforced concrete upper chord (2) of the truss is formed between the opposite connecting supports (5). The connecting supports (5) are installed on the precast reinforced concrete lower chord (1) by through-fixing bolts (6). The precast floor slab (3) overlaps on the connecting supports (5).

2. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 1, characterized in that: The connecting support (5) includes a connecting support body (51), side support plates (52) and a top support plate (53). There is one or more side support plates (52). The side support plates (52) are fixedly installed on the outside of the connecting support body (51). The side support plates (52) are arranged in parallel. The top support plate (53) is fixedly installed on the top of the connecting support body (51). There is one or more bolt holes (55) on the connecting support body (51) for inserting through-and-through fixing bolts (6).

3. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 2, characterized in that: The connecting support body (51) is provided with stiffening strips (54) on the outside.

4. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 3, characterized in that: The stiffening strip (54) is provided corresponding to the bolt hole (55).

5. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 1, characterized in that: The through-fixing bolt (6) includes a screw (61) and a nut (63). The screw (61) has screw threads (64) at both ends, and the nut (63) is installed on the screw threads (64).

6. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 5, characterized in that: The nut (63) is provided with an internal thread (65), which corresponds to the screw thread (64). The nut (63) is provided with an external thread (66) on one or both sides. The bolt hole (55) on the connecting support (5) is provided with an internal thread.

7. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 1, characterized in that: The precast truss reinforced concrete lower chord (1) has open stirrups (11) arranged in parallel on the cross section. There is one or more sets of open stirrups (11), and each open stirrup (11) is arranged in parallel. The lower half of the open stirrup (11) is set inside the precast truss reinforced concrete lower chord (1). There is one or more rows of bottom beam reinforcement (13) arranged along the length direction inside the precast truss reinforced concrete lower chord (1). Each row has one or more columns of bottom beam reinforcement (13). There is one or more rows of waist beam reinforcement (14) arranged in the middle position of the open stirrup (11). Each row has one or more columns of waist beam reinforcement (14). There is one or more rows of top beam reinforcement (15) arranged at the upper position of the open stirrup (11). Each row has one or more columns of top beam reinforcement (15).

8. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 1, characterized in that: A longitudinal reinforcement bar (16) is provided along the length of the precast truss reinforced concrete lower chord (1) at the location of the large opening. The longitudinal reinforcement bar (16) is provided above and below the location of the large opening.

9. The support-free, detachable, fixed template application structure for prefabricated structural systems according to claim 1, characterized in that: One or more sets of opening reinforcement stirrups (17) are provided at the location of the large opening on the precast truss reinforced concrete lower chord (1). The opening reinforcement stirrups (17) are provided around the large opening, and the opening reinforcement stirrups (17) are set parallel to the opening stirrups (11).

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