Precast beam construction method
By alternately stacking and laying steel bars in the node area of the prefabricated beam and laying them to both sides if the prefabricated stirrups are insufficient, the problem of insufficient height of prefabricated beams is solved, and construction efficiency and structural safety are improved.
Patent Information
- Application Number
- CN202311324610.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-13
- Publication Date
- 2025-04-15
AI Technical Summary
During construction, the pre-set stirrup height of the prefabricated beams is insufficient, resulting in the unsmoothly laid large diameter steel bars of the superposition layer, resulting in low construction efficiency, loss cost and structural safety risks.
By hoisting two prefabricated beams, the extension lines intersect, forming a node area, and alternately stacking and laying steel bars in the prefabricated stirrups. If the remaining height in the prefabricated stirrups is insufficient, lay the steel bars to both sides and use the rear stirrups and prefabricated plates for binding and fixing.
Improve construction efficiency, avoid interrupting pre-set stirrups and re-welding, ensure the smooth insertion of the overlapping steel bars, and enhance structural safety.
Smart Images
Figure CN119825143A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of building construction, and in particular to a prefabricated beam construction method. Background Art
[0002] The on-site laying of steel bars for the composite layer of prefabricated beams is a common difficulty and key issue in prefabricated buildings at this stage. Due to the limitation of floor slab thickness, the height of the prefabricated stirrups of prefabricated beams cannot meet the laying of large-diameter steel bars for the composite layer, which leads to the frequent interruption of prefabricated stirrups and re-welding at the construction site, resulting in low construction efficiency, loss of cost, and insufficient or missed steel bars, which affects the safety of the structure. Summary of the invention
[0003] Some embodiments of the present disclosure provide a prefabricated beam construction method for alleviating the problem of low construction efficiency.
[0004] In one aspect of the present disclosure, a prefabricated beam construction method is provided, comprising the following steps:
[0005] Hoisting two precast beams so that the extension lines of the two precast beams intersect and a node area is formed between the ends of the two precast beams;
[0006] Laying at least one layer of steel bars in the pre-set stirrups of the two prefabricated beams respectively, and arranging the steel bars in the pre-set stirrups of the two prefabricated beams alternately and stacked in the node region along the height direction of the pre-set stirrups;
[0007] When the remaining height space in the pre-set stirrups of one of the precast beams is less than the height of one layer of steel bars, the steel bars that cannot be laid in the pre-set stirrups are laid on both sides of the pre-set stirrups.
[0008] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0009] Post-placed stirrups are used to tie up the steel bars laid on both sides of the pre-placed stirrups.
[0010] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0011] Laying precast panels on both sides of the precast beams;
[0012] Wherein, the post-placed stirrups are connected to the prefabricated plate.
[0013] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0014] Before laying the steel bars, the arrangement of the steel bars in the node area is laid out.
[0015] In some embodiments, laying at least one layer of steel bars in the pre-placed stirrups of the two prefabricated beams respectively includes:
[0016] The ends of the steel bars laid in the pre-set stirrups of the two prefabricated beams all exceed the center line corresponding to the node area;
[0017] The center line refers to a line located in the node area and perpendicular to the extension direction of the steel bars, and the center line is located in the middle of the node area along the extension direction of the steel bars.
[0018] In some embodiments, the step of laying at least one layer of steel bars in the pre-placed stirrups of the two prefabricated beams further comprises:
[0019] Anchor plates are provided at the ends of the reinforcement that do not pass through the node area.
[0020] In some embodiments, the hoisting of two prefabricated beams includes:
[0021] Make the arrangement direction of multiple pre-set stirrups set at intervals on the prefabricated beam consistent with the extension direction of the steel bars.
[0022] In some embodiments, the two prefabricated beams include a first prefabricated beam and a second prefabricated beam, and the hoisting of the two prefabricated beams includes:
[0023] hoisting the first prefabricated beam so that an end of the first prefabricated beam is located on a first side of an end of a column;
[0024] hoisting the second prefabricated beam so that the end of the second prefabricated beam is located on a second side of the end of the column;
[0025] The first side and the second side are two adjacent sides of the end portion of the column.
[0026] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0027] Hoisting a third precast beam so that an end of the third precast beam is located on a third side of an end of the column, and the third precast beam and the first precast beam are located on the same straight line;
[0028] The fourth precast beam is hoisted so that an end of the fourth precast beam is located on a fourth side of the end of the column, and the fourth precast beam and the second precast beam are located on the same straight line.
[0029] In some embodiments, the node area is formed in a space enclosed by an end of the first precast beam, an end of the second precast beam, an end of the third precast beam, an end of the fourth precast beam, and an end of the column.
[0030] In some embodiments, among the steel bars laid in the pre-set stirrups of the first precast beam, at least one layer of steel bars passes through the node area and is located in the pre-set stirrups of the third precast beam;
[0031] Among the steel bars laid in the pre-placed stirrups of the second precast beam, at least one layer of steel bars passes through the node area and is located in the pre-placed stirrups of the fourth precast beam.
[0032] In some embodiments, the two prefabricated beams include a main beam and a secondary beam, and the first layer of steel bars corresponding to the main beam, the first layer of steel bars corresponding to the secondary beam, the second layer of steel bars corresponding to the main beam, and the second layer of steel bars corresponding to the secondary beam are laid sequentially in the node area along the height direction of the pre-set stirrups.
[0033] Based on the above technical solution, the present disclosure has at least the following beneficial effects:
[0034] In some embodiments, when the remaining height space within the pre-set stirrups of one of the precast beams is less than the height of one layer of steel bars, the steel bars are laid on both sides of the pre-set stirrups and supported by the corresponding steel bars of another precast beam. There is no need to break the pre-set stirrups and then re-weld them, thereby improving construction efficiency. Moreover, laying the steel bars on both sides of the pre-set stirrups can enable the steel bars of the overlapping layers to be smoothly inserted, avoiding collisions and alleviating the problem of difficulty in steel bar insertion construction. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:
[0036] Figure 1 A schematic side view of a prefabricated beam provided according to some embodiments of the present disclosure;
[0037] Figure 2 A schematic top view of a beam-column node area provided according to some embodiments of the present disclosure.
[0038] The reference numerals in the accompanying drawings are described as follows:
[0039] 1-precast beam; 11-first precast beam; 12-second precast beam; 13-third precast beam; 14-fourth precast beam; 101-main beam; 102-secondary beam;
[0040] 2-column; 3-node area; 4-pre-placed stirrups; 5-post-placed stirrups;
[0041] 6-rebar; 61-first layer of steel bars; 62-second layer of steel bars;
[0042] 7- precast slab; 8- anchoring slab; 9- laminated layer.
[0043] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION
[0044] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.
[0045] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0046] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.
[0047] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.
[0048] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.
[0049] refer to Figure 1The prefabricated beam 1 involved in the embodiment of the present disclosure refers to a beam that is prefabricated in a factory or processing plant using a fixed formwork and concrete, and then transported to the construction site for installation and fixation in the position required by the design.
[0050] In the assembled structure, the beam is divided into a prefabricated part and a cast-in-place part, the prefabricated part is the prefabricated beam 1, and the cast-in-place part is the laminated layer 9. In the production process of the assembled prefabricated concrete beam, the prefabricated beam 1 is prefabricated with prefabricated stirrups 4, and steel bars 6 are laid in the prefabricated stirrups 4 before pouring concrete.
[0051] After the precast beam 1 is hoisted, concrete is cast in situ on the upper part of the precast beam 1 to form the upper part of the beam. The casting operation needs to be carried out after the upper steel bars 6 of the precast beam 1 are inserted into the pre-placed stirrups 4. The function of the superimposed layer 9 is to use the precast beam 1 that has reached the strength as a formwork to bear the weight (construction load) of the concrete mixture of the cast-in-situ beam on it. The superimposed layer 9 works together with the precast beam 1 to bear the service load.
[0052] refer to Figure 1 , part of the stirrups of precast beam 1 is exposed outside and needs to be cast in situ with the floor slab. The height of precast beam 1 is H1, the height of the cast-in-situ part is H2, and the height of the entire beam is H3. H3=H1+H2.
[0053] The pre-set stirrups 4 on the precast beam 1 are set in advance. The height of the pre-set stirrups 4 is the thickness of the floor slab minus the thickness of the steel bar protective layer. Generally speaking, the height of the pre-set stirrups 4 will be indicated in the drawings.
[0054] In some related technologies, after the precast beam is hoisted, during the process of inserting the steel bars of the upper overlapping layer of the precast beam, due to the limitation of the floor thickness, the height of the pre-set stirrups of the precast beam will be insufficient, resulting in that when the overlapping layer steel bars are double-row and have a large diameter, they cannot be smoothly inserted on site, or the steel bar spacing in the pre-set stirrups after insertion cannot meet the requirements of the specifications; therefore, the pre-set stirrups are often interrupted on the construction site, and the steel bars are inserted and then re-welded, resulting in low construction efficiency.
[0055] Based on this, some embodiments of the present disclosure propose a prefabricated beam construction method to alleviate the problem of low construction efficiency.
[0056] refer to Figure 1 and Figure 2 In some embodiments, the prefabricated beam construction method includes the following steps:
[0057] Hoisting two precast beams 1 so that the extension lines of the two precast beams 1 intersect and a node area 3 is formed between the ends of the two precast beams 1;
[0058] At least one layer of steel bars 6 is laid in the pre-set stirrups 4 of the two prefabricated beams 1, respectively, and the steel bars 6 in the pre-set stirrups 4 of the two prefabricated beams 1 are alternately stacked in the node area 3 along the height direction of the pre-set stirrups 4;
[0059] When the remaining height space in the pre-set stirrups 4 of one of the prefabricated beams 1 is less than the height of one layer of steel bars 6 , the steel bars 6 that cannot be laid in the pre-set stirrups 4 are laid on both sides of the pre-set stirrups 4 .
[0060] In the above embodiment, when the remaining height space in the pre-set stirrups 4 of one of the precast beams 1 is less than the height of one layer of steel bars 6, the steel bars 6 that cannot be laid in the pre-set stirrups 4 are laid to both sides of the pre-set stirrups 4, and can be supported by the steel bars 6 corresponding to another precast beam 1. There is no need to break the pre-set stirrups to lay the steel bars and then re-weld them, which can improve construction efficiency. Moreover, laying the steel bars 6 to both sides of the pre-set stirrups 4 can enable the steel bars of the overlapping layer 9 to be smoothly inserted, prevent collisions, and alleviate the problem of difficulty in steel bar insertion construction.
[0061] The extension lines of the two prefabricated beams 1 in the embodiment of the present disclosure refer to the extension of the entire three-dimensional structure of the prefabricated beams 1 .
[0062] The ends of the two precast beams 1 in the embodiment of the present disclosure are close to each other, and a node area 3 is formed between the ends of the two precast beams 1; the extension lines of the two precast beams 1 intersect to form an angle greater than zero and less than 180 degrees, and the intersection of the extension lines of the two precast beams 1 is located in the node area 3.
[0063] Node area 3 is the area where beams and columns intersect. There are many steel bars in this area and they are very dense. Therefore, it is necessary to design the steel bar arrangement of node area 3 in advance in the drawings.
[0064] Assuming that there are 10 steel bars in the superimposed layer in the drawing, if the steel bars cannot be completely inserted into the pre-set stirrups because the height of the pre-set stirrups is not enough, the steel bars that cannot be inserted can be placed on both sides of the pre-set stirrups.
[0065] The steel bars 6 laid on both sides of the pre-set stirrups 4 can also be stacked up and down according to the height direction of the pre-set stirrups 4. The side view cross section of the entire assembly formed by the steel bars 6 laid on both sides of the pre-set stirrups 4, the steel bars 6 laid inside the pre-set stirrups 4, and the prefabricated beam 1 is T-shaped, as shown in FIG. Figure 1 shown.
[0066] In a building, beams are placed on top of columns. Both ends of a precast beam 1 are connected to columns 2 respectively. According to the load size and force form, the precast beam 1 includes a main beam 101 and a secondary beam 102. The main beam is the beam that bears the main force, and the secondary beam is the beam that bears the secondary force. Usually, the size, volume, and mass of the main beam are larger than those of the secondary beam, and the main beam and the secondary beam are located on the same plane.
[0067] refer to Figure 2 In some embodiments, the two prefabricated beams 1 are respectively a main beam 101 and a secondary beam 102. Therefore, there is a case where the remaining height space in the pre-placed stirrups 4 of the main beam 101 is less than the height of a layer of steel bars 6, or there is a case where the remaining height space in the pre-placed stirrups 4 of the secondary beam 102 is less than the height of a layer of steel bars 6. The steel bars 6 laid on both sides of the pre-placed stirrups 4 may be the steel bars corresponding to the main beam 101, or may be the steel bars corresponding to the secondary beam 102.
[0068] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0069] The post-placed stirrups 5 are arranged to bundle the steel bars 6 laid on both sides of the pre-placed stirrups 4 .
[0070] In the above embodiment, the steel bars 6 laid on both sides of the pre-placed stirrups 4 are bundled by the post-placed stirrups 5 , which can not only fix the steel bars 6 on both sides of the pre-placed stirrups 4 , but also improve the strength of the laminated layer 9 .
[0071] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0072] Laying precast panels 7 on both sides of the precast beam 1;
[0073] The post-placed stirrups 5 are connected to the prefabricated slab 7 .
[0074] In the above embodiment, concrete is poured on the top of the precast beams 1 and the precast slabs 7 to form a floor slab, and the post-placed stirrups 5 are connected to the precast slabs 7. The post-placed stirrups 5 bundle the steel bars 6 laid on both sides of the precast stirrups 4, which can not only fix the steel bars 6 on both sides of the precast stirrups 4, but also connect the precast slabs 7, thereby improving the strength of the composite layer 9.
[0075] refer to Figure 1 The width of the precast beam 1 is L1, and the steel bars that cannot be laid in the pre-set stirrups 4 are laid within the width range L2 of the precast panel 7.
[0076] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0077] Before laying the steel bars 6 , the arrangement of the steel bars 6 in the node area 3 is laid out.
[0078] In the above embodiment, the arrangement of the steel bars can be calculated and optimized at the design stage to alleviate the problem of insufficient or missed steel bars and improve structural safety. By calculating the load structure of the precast beam, the number of longitudinal steel bars in the superimposed layer of the two precast beams 1 (main beam and secondary beam) is obtained respectively; thereafter, the arrangement of the steel bars is laid out in a plane, and the steel bars of the superimposed layer of the main beam and the secondary beam are arranged in order from bottom to top while avoiding collision of the steel bars.
[0079] When the height of the preset stirrups 4 is insufficient, the steel bars that cannot be passed through the height range of the preset stirrups 4 are arranged within the width range of the prefabricated panels 7 on both sides of the prefabricated beam 1 to form a T-shaped section, and then all the steel bars on the same beam are tied together with post-placed stirrups 5.
[0080] The extension direction of the steel bars corresponding to the precast beam 1 is parallel to the length extension direction of the precast beam 1 .
[0081] In some embodiments, the distance between two adjacent post-placed stirrups 5 is twice the distance between two adjacent pre-placed stirrups 4 .
[0082] In some embodiments, at least one layer of steel bars 6 is laid in the pre-placed stirrups 4 of the two prefabricated beams 1, respectively, including:
[0083] The ends of the steel bars 6 laid in the pre-placed stirrups 4 of the two precast beams 1 all exceed the center line L corresponding to the node area 3 .
[0084] refer to Figure 2 , wherein the center line L refers to a line located in the node area 3 and perpendicular to the extension direction of the steel bar 6, and the center line L is located in the middle of the node area 3 along the extension direction of the steel bar 6.
[0085] In the above embodiment, since the two precast beams 1 extend in different directions, the steel bars laid in the pre-set stirrups 4 of the two precast beams 1 extend in different directions, and the corresponding center lines L of the node regions 3 are different. Figure 2 There are two center lines L. The intersection of the two center lines L is the center of the node area. The center line L is located in the middle of the node area 3 along the extension direction of the steel bar 6 and is a virtual line. Usually, when talking about the length of the steel bar penetrating into the beam-column node area 3, the center line is used as the reference point, such as the steel bar exceeds the center line of the column, or exceeds the center line of the column by a certain number of centimeters, etc.
[0086] In some embodiments, at least one layer of steel bars 6 is laid in the pre-placed stirrups 4 of the two prefabricated beams 1, respectively, and further includes:
[0087] Anchor plates 8 are provided at the ends of the reinforcement 6 that do not pass through the node region 3 .
[0088] In some related technologies, in the beam-column node area 3, due to the excessive density of steel bars and the limited plate thickness and beam height, after the main beam steel bars are inserted and installed, the secondary beam composite layer steel bars in the other direction may be unable to be inserted due to steel bar collision; therefore, in the above-mentioned embodiment of the present disclosure, the steel bar 6 is inserted into the node area 3 and exceeds the center line L corresponding to the node area 3. The steel bar 6 does not need to pass through the node area 3, and an anchor plate 8 is set at the end of the steel bar 6 to increase the strength of the composite layer 9 and alleviate the problem of too many steel bars in the composite layer 9 that cannot be inserted.
[0089] In the above embodiment, the anchor plate 8 is a component that mechanically anchors the steel bars.
[0090] In some embodiments, hoisting two prefabricated beams 1 includes:
[0091] The arrangement direction of the plurality of pre-set stirrups 4 disposed at intervals on the prefabricated beam 1 is made consistent with the extension direction of the steel bars 6 .
[0092] In the above embodiment, the pre-set stirrups 4 are pre-set on the prefabricated beam 1, and a plurality of pre-set stirrups 4 are arranged at intervals along the extension direction of the prefabricated beam 1. The arrangement direction of the plurality of pre-set stirrups 4 is consistent with the extension direction of the steel bars 6. The steel bars 6 arranged on the prefabricated beam 1 are bundled and fixed by the plurality of pre-set stirrups 4 to improve the structural strength.
[0093] refer to Figure 2 In some embodiments, the two prefabricated beams 1 include a first prefabricated beam 11 and a second prefabricated beam 12, and hoisting the two prefabricated beams 1 includes:
[0094] Hoisting the first precast beam 11, so that the end of the first precast beam 11 is located on a first side of the end of the column 2;
[0095] Hoisting the second precast beam 12 so that the end of the second precast beam 12 is located on the second side of the end of the column 2;
[0096] The first side and the second side are two adjacent sides of the end portion of the column 2 .
[0097] In the above embodiment, the end of the first precast beam 11 and the end of the second precast beam 12 are located on adjacent sides of the end of the column 2 rather than on opposite sides, so as to achieve the intersection of the extension lines of the two precast beams 1 .
[0098] The ends of the first precast beam 11, the second precast beam 12 and the column 2 form a beam-column node region 3. At least one layer of first steel bars is laid in the pre-set stirrups 4 of the first precast beam 11, and at least one layer of second steel bars is laid in the pre-set stirrups 4 of the second precast beam 12; the first steel bars and the second steel bars are alternately stacked up and down in the node region 3 along the height direction of the pre-set stirrups 4.
[0099] In some embodiments, the prefabricated beam construction method further comprises the following steps:
[0100] Hoist the third precast beam 13 so that the end of the third precast beam 13 is located on the third side of the end of the column 2, and the third precast beam 13 and the first precast beam 11 are located on the same straight line;
[0101] The fourth precast beam 14 is hoisted so that the end of the fourth precast beam 14 is located at the fourth side of the end of the column 2 and the fourth precast beam 14 and the second precast beam 12 are located on the same straight line.
[0102] In the above embodiment, the end of the column 2 includes four side surfaces, namely, a first side, a second side, a third side, and a fourth side. The end of the first precast beam 11 is located at the first side of the end of the column 2, the end of the second precast beam 12 is located at the second side of the end of the column 2, the end of the third precast beam 13 is located at the third side of the end of the column 2, and the end of the fourth precast beam 14 is located at the fourth side of the end of the column 2. The third precast beam 13 is located on the same straight line as the first precast beam 11, and the fourth precast beam 14 is located on the same straight line as the second precast beam 12.
[0103] Precast beams 1 are respectively arranged on the four sides of the end of the column 2, and the four precast beams 1 are connected by steel bars, and a superimposed layer 9 is formed by pouring concrete, which can improve the structural strength.
[0104] In some embodiments, the node area 3 is formed in a space enclosed by an end of the first precast beam 11 , an end of the second precast beam 12 , an end of the third precast beam 13 , an end of the fourth precast beam 14 , and an end of the column 2 .
[0105] In the above embodiment, concrete is poured at the top of the column 2, the top of each precast beam 1, and the node area 3, and the column 2 is respectively connected to the first precast beam 11, the second precast beam 12, the third precast beam 13, and the fourth precast beam 14 to form a stable and firm floor support structure.
[0106] In some embodiments, among the steel bars 6 laid in the pre-placed stirrups 4 of the first precast beam 11 , at least one layer of steel bars 6 passes through the node area 3 and is located in the pre-placed stirrups 4 of the third precast beam 13 .
[0107] Among the steel bars 6 laid in the pre-installed stirrups 4 of the second precast beam 12 , at least one layer of steel bars 6 passes through the node region 3 and is located in the pre-installed stirrups 4 of the fourth precast beam 14 .
[0108] In the above embodiment, at least the same layer of steel bars 6 is laid in the pre-set stirrups 4 of the first prefabricated beam 11 and the third prefabricated beam 13, and at least the same layer of steel bars 6 is laid in the pre-set stirrups 4 of the second prefabricated beam 12 and the fourth prefabricated beam 14, which can improve the structural strength.
[0109] In the above embodiment, the steel bars 6 are laid in order from bottom to top, the first layer of steel bars 6 laid in the pre-placed stirrups 4 of the first precast beam 11 passes through the node area 3 and is located in the pre-placed stirrups 4 of the third precast beam 13, and the first layer of steel bars 6 laid in the pre-placed stirrups 4 of the second precast beam 12 passes through the node area 3 and is located in the pre-placed stirrups 4 of the fourth precast beam 14. The steel bars are laid alternately in order.
[0110] When there are too many steel bars and the steel bars 6 cannot completely pass through the node area 3 , the ends of the steel bars 6 are made to exceed the center line L corresponding to the node area 3 , and an anchor plate 8 can be provided at the ends of the steel bars 6 .
[0111] In some embodiments, the two precast beams 1 include a main beam 101 and a secondary beam 102. The first layer of steel bars 61 corresponding to the main beam 101, the first layer of steel bars corresponding to the secondary beam 102, the second layer of steel bars 62 corresponding to the main beam 101, and the second layer of steel bars corresponding to the secondary beam 102 are laid in sequence along the height direction of the pre-set stirrups 4 in the node area 3.
[0112] In the above embodiment, the precast beams in the laminated layer 9 are respectively arranged with double rows of steel bars (not limited to double rows of steel bars), and the construction sequence of alternating layers from bottom to top can greatly reduce the difficulty of reinforcing bars in on-site construction and ensure structural safety. In addition, for the situation where the steel bars 6 cannot be laid in the pre-set stirrups 4, a T-shaped cross-section precast beam laminated layer steel bar arrangement form is provided, and the steel bars 6 are laid on both sides of the pre-set stirrups 4, and supported by the steel bars 6 corresponding to another precast beam 1, so that the pre-set stirrups do not need to be broken and then re-welded, thereby improving construction efficiency.
[0113] The steel bars 6 laid on both sides of the pre-placed stirrups 4 may also be laid in an alternating and stacked order from bottom to top.
[0114] Before laying the steel bars, the layout design is carried out in advance: when it is known that the number of steel bars 6 is too large and it is impossible to lay all of them in the pre-set stirrups 4, the steel bars in the pre-set stirrups 4 and the steel bars on both sides of the pre-set stirrups 4 are arranged in advance. During the construction process, the steel bars in the pre-set stirrups 4 and the steel bars on both sides of the pre-set stirrups 4 can be laid in layers simultaneously, so that the steel bars 6 in the pre-set stirrups 4 are alternately stacked in the node area 3 along the height direction of the pre-set stirrups 4, and the steel bars on both sides of the pre-set stirrups 4 are alternately stacked along the height direction of the pre-set stirrups 4.
[0115] A specific embodiment is provided below to describe the prefabricated beam construction method in detail. In this specific embodiment, the prefabricated beam construction method includes the following steps:
[0116] S1: Arrangement of the steel bars 6 of the precast beam 1 in the beam-column joint area 3 is laid out in advance during the design phase, so as to avoid or reduce collision of the steel bars 6;
[0117] S2: After the precast beam 1 is hoisted, first insert the lower layer of steel bars 6 in the double layer of steel bars 6 of the superimposed layer of the main beam 101; the precast beam 1 includes the main beam 101 and the secondary beam 102;
[0118] S3: Insert the lowest layer of steel bars 6 of the secondary beam 102 in the other direction into the pre-placed stirrups 4 of the secondary beam 102 and place them above the lower layer of steel bars 6 of the main beam 101; the main beam 101 and the secondary beam 102 are in the same plane, and the volume of the main beam 101 is generally larger than that of the secondary beam 102;
[0119] S4: insert the upper steel bars 6 of the laminated layer of the main beam 101 and place them above the lower steel bars 6 of the secondary beam 102;
[0120] S5: The upper steel bars 6 of the superimposed layer of the secondary beam 102 need to be placed above the upper steel bars 6 of the main beam 101. There are two situations:
[0121] The first case: if the height of the pre-set stirrups 4 of the secondary beam 102 is sufficient, the upper steel bars 6 of the superimposed layer of the secondary beam 102 can be directly inserted into the pre-set stirrups 4;
[0122] The second situation: If the height of the preset stirrups 4 of the secondary beam 102 is insufficient, the upper steel bars 6 of the laminated layer of the secondary beam 102 cannot be installed within the height range of the preset stirrups 4, the upper steel bars 6 of the laminated layer of the secondary beam 102 can be placed on both sides of the preset stirrups 4 of the secondary beam 102, and located within the set width L2 of the prefabricated panels 7 on both sides of the secondary beam 102, and the secondary beam 102 and the laminated layer steel bars 6 form a T-shaped section.
[0123] For the second case, after the upper steel bars 6 of the superimposed layer of the secondary beam 102 are placed on both sides of the pre-installed stirrups 4 of the secondary beam 102, and the steel bars 6 on both sides of the pre-installed stirrups 4 of the secondary beam 102 are tied together with the post-installed stirrups 5 with the same strength and the same diameter as the pre-installed stirrups 4, the installation and interlacing construction of the double-layer steel bars 6 of the superimposed layer of the main beam 101 and the secondary beam 102 can be completed.
[0124] In the above embodiment, the upper and lower relationships of the steel bars 6 of the main beam 101 and the secondary beam 102 are: from bottom to top: the lower steel bars 6 of the main beam 101, the lower steel bars 6 of the secondary beam 102, the upper steel bars 6 of the main beam 101, and the upper steel bars 6 of the secondary beam 102, which are cross-arranged.
[0125] In the above embodiment, if there are too many steel bars 6 in the overlapping layer of the main beam 101, which makes it difficult to thread the steel bars in the beam-column node area, an anchor plate can be used to extend part of the steel bars 6 beyond the center line of the column and an anchor plate 8 can be set at the end of the part of the steel bars 6.
[0126] In the disclosed embodiment, the arrangement of the composite layer of steel bars 6 of the precast beam 1 is optimized. When the remaining height space in the pre-set stirrups 4 of one of the precast beams 1 is less than the height of one layer of steel bars 6, the steel bars 6 that cannot be laid in the pre-set stirrups 4 are laid to both sides of the pre-set stirrups 4, forming a T-section node arrangement. By a reasonable sequence and method of threading the bars, the collision problem of the steel bars 6 at the intersection of the main beam 101 and the secondary beam 102 is solved, thereby facilitating on-site construction while ensuring structural safety.
[0127] The specific operation of the precast beam construction method provided in the embodiment of the present disclosure can refer to Article 5.2.4 of the "Code for Design of Concrete Structures" which states that "the floor slab should consider the influence of the floor slab as a flange on the beam stiffness and bearing capacity", and Article 4.2.5 of the "Code for Seismic Design of Prestressed Concrete Structures" which states that "the effect of the slab reinforcement outside the column width on resisting bending moment can be considered" as a basis for calculation and reference.
[0128] The "floor slab" involved in the embodiments of the present disclosure may be a structural layer in the field of housing construction, or may be a structural layer related to a road surface or a bridge deck in the field of logistics construction.
[0129] The nodes and construction methods in the embodiments of the present disclosure can be applied to ordinary precast beams 1 and can also be applied to prestressed large-span precast beams 1. The measures are simple and easy to operate.
[0130] Based on the above-mentioned embodiments of the present disclosure, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.
[0131] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims
1. A prefabricated beam construction method, characterized in that: The following steps are involved: Hoisting two prefabricated beams (1) so that the extension lines of the two prefabricated beams (1) intersect and a node area (3) is formed between the ends of the two prefabricated beams (1); At least one layer of steel bars (6) is laid in the pre-set stirrups (4) of the two prefabricated beams (1), respectively, and the steel bars (6) in the pre-set stirrups (4) of the two prefabricated beams (1) are arranged alternately in layers along the height direction of the pre-set stirrups (4) in the node region (3); When the remaining height space in the pre-set stirrups (4) of one of the prefabricated beams (1) is less than the height of a layer of steel bars (6), the steel bars (6) that cannot be laid in the pre-set stirrups (4) are laid on both sides of the pre-set stirrups (4).
2. The prefabricated beam construction method according to claim 1, characterized in that: The following steps are also included: The post-placed stirrups (5) are arranged to bundle the steel bars (6) laid on both sides of the pre-placed stirrups (4).
3. The prefabricated beam construction method according to claim 2, characterized in that: The following steps are also included: Laying prefabricated panels (7) on both sides of the prefabricated beam (1); Wherein, the post-placed stirrups (5) are connected to the prefabricated plate (7).
4. The prefabricated beam construction method according to claim 1, characterized in that: The following steps are also included: Before laying the steel bars (6), the arrangement of the steel bars (6) in the node area (3) is laid out.
5. The prefabricated beam construction method according to claim 1, characterized in that: The method of laying at least one layer of steel bars (6) in the pre-placed stirrups (4) of the two prefabricated beams (1) comprises: The ends of the steel bars (6) laid in the pre-set stirrups (4) of the two prefabricated beams (1) all exceed the center line (L) corresponding to the node area (3); The center line (L) refers to a line located in the node area (3) and perpendicular to the extension direction of the steel bar (6), and the center line (L) is located in the middle of the node area (3) along the extension direction of the steel bar (6).
6. The prefabricated beam construction method according to claim 5, characterized in that: The method of laying at least one layer of steel bars (6) in the pre-placed stirrups (4) of the two prefabricated beams (1) also includes: Anchor plates (8) are provided at the ends of the reinforcement bars (6) that do not pass through the node area (3).
7. The prefabricated beam construction method according to claim 1, characterized in that: The method of hoisting two prefabricated beams (1) comprises: The arrangement direction of the plurality of pre-set stirrups (4) arranged at intervals on the prefabricated beam (1) is made consistent with the extension direction of the steel bars (6).
8. The prefabricated beam construction method according to claim 1, characterized in that: The two prefabricated beams (1) include a first prefabricated beam (11) and a second prefabricated beam (12), and the hoisting of the two prefabricated beams (1) includes: hoisting the first prefabricated beam (11) so that the end of the first prefabricated beam (11) is located on a first side of the end of the column (2); hoisting the second prefabricated beam (12) so that the end of the second prefabricated beam (12) is located on a second side of the end of the column (2); The first side and the second side are two adjacent sides of the end of the column (2).
9. The prefabricated beam construction method according to claim 8, characterized in that: The following steps are also included: hoisting a third prefabricated beam (13) so that the end of the third prefabricated beam (13) is located on a third side of the end of the column (2), and so that the third prefabricated beam (13) and the first prefabricated beam (11) are located on the same straight line; The fourth precast beam (14) is hoisted so that the end of the fourth precast beam (14) is located on the fourth side of the end of the column (2), and the fourth precast beam (14) and the second precast beam (12) are located on the same straight line.
10. The prefabricated beam construction method according to claim 9, characterized in that: The node area (3) is formed in a space enclosed by the end of the first precast beam (11), the end of the second precast beam (12), the end of the third precast beam (13), the end of the fourth precast beam (14) and the end of the column (2).
11. The prefabricated beam construction method according to claim 9, characterized in that: Among the steel bars (6) laid in the pre-placed stirrups (4) of the first prefabricated beam (11), at least one layer of steel bars (6) passes through the node area (3) and is located in the pre-placed stirrups (4) of the third prefabricated beam (13); Among the steel bars (6) laid in the pre-set stirrups (4) of the second prefabricated beam (12), at least one layer of steel bars (6) passes through the node area (3) and is located in the pre-set stirrups (4) of the fourth prefabricated beam (14).
12. The prefabricated beam construction method according to any one of claims 1 to 11, characterized in that: The two prefabricated beams (1) include a main beam (101) and a secondary beam (102), and a first layer of steel bars (61) corresponding to the main beam (101), a first layer of steel bars corresponding to the secondary beam (102), a second layer of steel bars (62) corresponding to the main beam (101), and a second layer of steel bars corresponding to the secondary beam (102) are sequentially laid in the node region (3) along the height direction of the pre-set stirrups (4).