CN211340847U - Precast beam of underground structure in reverse construction method - Google Patents
Precast beam of underground structure in reverse construction method Download PDFInfo
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- CN211340847U CN211340847U CN201921369668.8U CN201921369668U CN211340847U CN 211340847 U CN211340847 U CN 211340847U CN 201921369668 U CN201921369668 U CN 201921369668U CN 211340847 U CN211340847 U CN 211340847U
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- 238000010276 construction Methods 0.000 title claims abstract description 84
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000004873 anchoring Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000011374 ultra-high-performance concrete Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses an underground structure's precast beam in reverse construction method, including a plurality of ring beams and a plurality of horizontal beam that form a body structure, the size of ring beam and underground structure's stand stake phase-match, two are adjacent pass through between the ring beam horizontal beam connects, still is provided with the horizontal beam who is connected with secret envelope on the outlying ring beam. The ring beam and the horizontal beams of the precast beam form an integral structure, a plurality of horizontal beams connected with the underground enclosure structure are arranged, the ring beam is sleeved on the upright post pile, and then the connecting node between the ring beam and the upright post pile and the connecting node between the horizontal beams and the underground enclosure structure are fixedly connected through the post-pouring section, so that the integral installation of the precast beam can be realized, the precast beam is suitable for the top-down beam-lowering construction of the underground structure, and the construction efficiency can be accelerated.
Description
Technical Field
The utility model relates to an underground structure's precast beam in reverse construction method belongs to construction technical field.
Background
The existing reverse construction method can adopt a construction mode of cast-in-place construction layer by layer or a prefabricated slab descending construction mode of prefabricating a whole layer of a floor slab, and the two modes all need to construct each layer of the floor slab structure from top to bottom, so the following problems exist:
1. during the reverse construction method, the beam plate structure is poured layer by layer in the lower structure construction from top to bottom, only a narrow soil taking opening is communicated with the ground during each layer of construction, and the construction site is relatively closed and narrow;
2. when a cast-in-place structure is adopted for construction, the problems of inconvenience in erecting a template support, difficulty in erecting a template and the like can be faced in a closed space, the construction difficulty is high, the construction quality is not easy to guarantee, a large amount of steel, wood and the like are consumed, and the resource waste is caused; meanwhile, the space is relatively closed, so that the air circulation is not smooth, the lighting is insufficient, and the safety of constructors is threatened; in addition, the maintenance of the cast-in-place structure occupies a large construction period, and the construction efficiency is reduced;
3. when a prefabricated slab descending construction system is adopted, each floor slab and beam are integrally prefabricated, the size and the weight of the prefabricated slab descending construction system are huge, the requirements on required transportation, hoisting and auxiliary slab descending construction equipment are high, meanwhile, the requirement on construction precision of integral slab descending hoisting is high, and the construction difficulty is increased.
In a word, current reverse construction method underground structure construction system need be under construction in constrictive construction space, and air cycle is unfavorable, the daylighting is not enough, and construction space environment is abominable, can't compromise the construction degree of difficulty and efficiency of construction simultaneously, needs utility model a neotype construction method and new building element to solve above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of underground structure's precast beam in reverse construction method can be applied to underground structure's reverse construction method and fall in the roof beam construction to improve the efficiency of construction, reduce the construction degree of difficulty.
For solving the technical problem, the utility model discloses a following technical scheme:
precast beam for an underground structure in a topdown method, the precast beam comprising:
the size of the ring beams is matched with that of the upright post piles of the underground structure;
the two adjacent ring beams are connected through the horizontal beams, and the peripheral ring beams are also provided with the horizontal beams connected with the underground enclosure structure;
and the plurality of ring beams and the plurality of horizontal cross beams form an integral structure.
Furthermore, the inner side of the ring beam is provided with a dowel steel along the radial direction, and the joint of the upright post pile and the ring beam is provided with a shear-resistant stud.
Furthermore, horizontal direction's anchor reinforcing bar is provided with to both sides on the horizontal beam for be connected with the floor board.
Further, 9 ring beams are regularly arranged in 3 rows and 3 columns, the number of the horizontal cross beams is 24, each ring beam is connected with 4 horizontal cross beams, and 12 horizontal cross beams which extend outwards and are used for being connected with an underground enclosure structure are further arranged on 8 peripheral ring beams of the precast beam.
The utility model provides a precast beam of underground structure in reverse construction method, a plurality of ring beam and a plurality of horizontal beam form overall structure, precast beam includes the horizontal beam who is connected with secret envelope, only needs to overlap ring beam on the upright post pile, then pours section fixed connection after with connected node between ring beam and the upright post pile, connected node between horizontal beam and the secret envelope, can realize precast beam's integral erection, is applicable to underground structure's reverse construction and falls the roof beam construction, can accelerate the efficiency of construction.
Drawings
FIG. 1 is a schematic view illustrating construction of a guide groove and an underground diaphragm wall;
FIG. 2 is a schematic diagram of the construction of a stud pile;
FIG. 3 is a schematic diagram of the installation of a crane frame and the construction of a top precast beam of an underground floor;
FIG. 4 is a top view of precast beams, stud piles, and underground diaphragm walls;
FIG. 5 is a partially enlarged view of a connection node of a precast beam and a stud pile;
6-9 are schematic diagrams of construction of top precast beams from the underground second floor to the underground fifth floor respectively;
fig. 10 is a schematic diagram of floor slab construction of an underground structure and synchronous construction of an above-ground structure.
The numbers in the figures are as follows:
10-underground diaphragm wall; 11-a first groove; 12-a second groove; 13-a third groove; 14-a fourth groove; 15-temporary support of the corbel;
20-vertical column pile; 21-shear studs;
30-a crane frame; 31-a transverse strut; 32-vertical struts; 33-a crane;
40-prefabricating a beam; 41-ring beam; 42-horizontal beam; 43-a dowel bar; 44-anchoring the reinforcing bar;
50-large bottom plate; 51-floor plate;
60-superstructure.
Detailed Description
The present invention provides a method for constructing a beam of an underground structure in a reverse construction method, which is further described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent in conjunction with the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
Example one
The present embodiment provides a precast beam for an underground structure in a reverse construction method, as shown in fig. 4 and 5, the precast beam including:
a plurality of ring beams 41, the size of the ring beams 41 is matched with that of the upright piles 20 of the underground structure;
the two adjacent ring beams 41 are connected through the horizontal beams 42, and the peripheral ring beams 41 are also provided with the horizontal beams 42 connected with the underground enclosure structure;
a plurality of the ring beams 41 and a plurality of the horizontal cross beams 42 form an integral structure.
As shown in fig. 5, the ring beam 41 is provided with a dowel 43 along the radial direction inside, and the joint of the stud 20 and the ring beam 41 is provided with a shear pin 21. And horizontal anchoring steel bars 44 are arranged on two sides of the horizontal cross beam 42 and are used for being connected with the floor slab. The connection effect between the ring beam 41 and the stud 20 can be improved by providing the stud bolts 21 and the studs 43. By arranging the anchoring reinforcing bars 44 on the horizontal cross beams 42, the connection effect of the floor plates 51 and the horizontal cross beams 42 can be improved, and the construction speed is increased. Wherein, the floor plate can adopt a prefabricated or cast-in-place mode.
As shown in fig. 4, the number of the ring beams 41 is 9, the ring beams are regularly arranged in 3 rows and 3 columns, the number of the horizontal cross beams 42 is 24, each ring beam 41 is connected with 4 horizontal cross beams 42, and 12 horizontal cross beams which extend outwards and are used for being connected with an underground enclosure structure are further arranged on 8 peripheral ring beams of the precast beam 40.
The utility model provides a precast beam of underground structure in reverse construction method, a plurality of ring beam and a plurality of horizontal beam form overall structure, precast beam includes the horizontal beam who is connected with secret envelope, only needs to overlap ring beam on the upright post pile, then pours section fixed connection after with connected node between ring beam and the upright post pile, connected node between horizontal beam and the secret envelope, can realize precast beam's integral erection, is applicable to underground structure's reverse construction and falls the roof beam construction, can accelerate the efficiency of construction.
Example two
With reference to fig. 1 to 10, a method for constructing a beam of a underground structure in a reverse method according to this embodiment will be further described. Wherein, the underground structure has 5 layers, and the marks are respectively a first underground layer, a second underground layer, … and a fifth underground layer from top to bottom. The construction method comprises the following steps:
s1, as shown in figures 1 and 2, excavating a guide groove below the ground, and placing a prefabricated underground continuous wall 10 in the guide groove to form a building enclosure of a construction area; a plurality of grooves are formed in the inner side of each underground continuous wall 10 along the height direction of the underground continuous wall, and a plurality of upright piles 20 are driven into the underground structure construction area. By way of example, a groove is respectively arranged below the connecting node of the precast beam 40 from the first floor to the 4 floors below the ground and the underground continuous wall 10, and a first groove 11, a second groove 12, a third groove 13 and a fourth groove 14 are arranged from top to bottom in sequence, that is, no groove is arranged below the connecting node of the precast beam 40 from the fifth floor and the underground continuous wall 10. As shown in fig. 4, in the present embodiment, the underground continuous wall 10 has a rectangular structure, and three rows and three columns of 9 stud piles 20 are driven into the construction area.
S2, as shown in figure 3, a crane rack 30 is arranged on the upright post 20, a plurality of cranes 33 are arranged on the crane rack 30, every two cranes 33 form a group, and the positions of the cranes 33 correspond to the positions of the precast beams 40 of the underground structure. The crane frame 30 comprises a vertical supporting rod 32 and a horizontal supporting rod 31, wherein one vertical supporting rod 32 is arranged on each upright post 20, the vertical supporting rod 32 is correspondingly arranged on the ground continuous wall, the horizontal supporting rod 31 is horizontally arranged, and two ends of the horizontal supporting rod 31 are respectively fixed on the vertical supporting rods 32. By way of example, the crane 33 may be an electric hoist or a hand hoist for hoisting the precast beam 40 of the underground structure. Referring to fig. 4, each of the 9 stud piles is provided with one vertical strut 32, each edge of the underground diaphragm wall 10 is correspondingly provided with 3 vertical struts 32, 21 vertical struts are provided, the horizontal struts 31 connect all the vertical struts into a whole, and each vertical strut 31 is provided with 2 cranes.
S3, as shown in FIG. 3 excavation soil layer to one layer of underground elevation in the underground structure construction area, every install interim support bracket 15 on the first recess 11 of underground continuous wall 10, place 5 prefabricated beams 40 that coincide in through loop wheel 33 on the interim support bracket 15, 5 coincide are placed prefabricated beam 40 is first layer prefabricated beam 40, second floor prefabricated beam 40, …, fifth layer prefabricated beam 40 from top to bottom in proper order, combine shown in FIG. 4, every prefabricated beam 40 all includes 9 ring beams 41 and 24 horizontal cross beam 42, is connected with 4 horizontal cross beam 42 on every ring beam 41 respectively, sets up a horizontal cross beam 42 between the adjacent ring beam 41, and outlying ring beam 41 is through outside horizontal cross beam 42 and underground continuous wall 10 fixed connection that extend, and ring beam 41 overlaps respectively on the upright post stake 20 that corresponds, first layer prefabricated beam 40 and underground continuous wall 10, The connection joints between the upright piles 20 are connected by post-cast concrete, and the construction of the top precast beam 40 of the underground layer of the underground structure is completed. Wherein, the post-cast concrete is cast by ultra high performance concrete (UHPC for short), and has the advantages of high strength, fast strength rise, strong caking property and the like.
S4, as shown in FIG. 6 excavation soil layer to two layers of elevation in the underground structure construction area, every install interim support bracket 15 on the second recess 12 of underground continuous wall 10, descend and shelve on the interim support bracket 15 on two layers in the underground with 4 precast beams 40 that remain the coincide and place, demolish the interim support bracket 15 of first recess 11 department, cast after the concrete connection is adopted to the connected node between second layer precast beam 40 and underground continuous wall 10, stand pile 20, accomplish the construction of two layers of underground top precast beam 40.
And S5, as shown in the figures 7 to 9, repeating the step S4 to finish the construction of the top precast beams 40 of the underground structure with three to five layers, and then dismantling the crane 33 and the crane frame 30.
S6, as shown in the figure 10, pouring a large bottom plate 50 of the underground structure, and sequentially constructing floor plates 51 of all layers of the underground structure from bottom to top. The upper structure 60 of the building can be constructed simultaneously when the floor panels 51 of the respective floors of the underground structure are constructed.
The utility model provides a girder construction method falls of underground structure in reverse construction method, at first, precast beam 40 of all layers of one-off prefabrication underground structure, precast beam 40 of each layer includes a plurality of ring beam 41 and horizontal beam 42 that link as an organic whole, all precast beams 40 are folded together by loop wheel machine 33; when the top precast beam 40 of a certain layer of the underground structure is constructed, the precast beam 40 is lowered, the precast beam 40 is placed on the temporary support bracket 15, and the precast beam 40 on the uppermost layer, the upright post pile 20 and the underground connecting wall are directly poured and fixed; and after the next layer of underground soil is excavated, the rest precast beams 40 are descended, so that the construction of all the precast beams 40 of the underground structure is completed in sequence. Compared with the original top-down construction method of cast-in-place layer by layer, the utility model adopts the construction method of integrally prefabricating, integrally hoisting and sequentially lowering the beams for each layer of prefabricated beams 40 of the underground structure, thereby saving the maintenance time of the cast-in-place structure, greatly improving the construction efficiency, simultaneously avoiding the potential safety hazard due to the work of supporting the template, and saving a large amount of resources such as steel, wood and the like; moreover, the beam descending method is adopted to complete the construction of all the precast beams, and then the floor plates of all the layers are constructed sequentially from the right to the top, so that the lighting and air circulation environment is better, the construction difficulty is reduced, and the construction difficulty and the construction efficiency are effectively balanced; therefore, the utility model discloses a to fall roof beam method construction technology and prefabricated assembled construction technology with the contrary work and combine together, the construction is simple and convenient and more high-efficient, stable, safe, has ensured construction quality to form one set and can make things convenient for, quick, safe and high-quality ground and carry out the industrialization building construction system that reverse construction method was under construction.
Further, the top elevation of the temporary support bracket 15 on the ith floor of the underground structure is HLiWherein H isLi＝HYi-B (N + 1-i); wherein i is 1, 2, …, N; hYiThe elevation of the top of the i-th layer of precast beam 40; b is the height of the precast beam 40. That is to say that the distance between the elevation at first layer precast beam 40 top and the top elevation of interim support bracket 15 equals the height of 5 precast beams 40, just makes first layer precast beam 40 be located design elevation this moment, and in the same way, a plurality of precast beams 40 of shelving on the interim support bracket 15 of other each layer, the precast beam 40 of the superiors is located the design elevation on this layer all the time, can realize precast beam 40's quick installation, improves the efficiency of construction. Of course, if the number of the grooves is N-1, the value i is 1, 2, …, N-1.
Further, as shown in fig. 4 and 5, the ring beam 41 is provided with a dowel 43 along the radial direction inside, the shear stud 21 is provided at the connection node between the stud post 20 and the ring beam 41, and the ring beam 41 and the stud post 20 are cast with ultra-high performance concrete. Furthermore, the horizontal direction anchoring steel bars 44 are arranged on two sides of the horizontal cross beam 42 and are used for being connected with the floor plates 51, at this time, the floor plates 51 can be of a prefabricated structure, the construction efficiency is improved, and concrete is poured only at the connecting positions of the floor plates and the horizontal cross beam 42. The connection effect between the ring beam 41 and the stud 20 can be improved by providing the stud bolts 21 and the studs 43. By arranging the anchoring reinforcing bars 44 on the horizontal cross beams 42, the connection effect of the floor plates 51 and the horizontal cross beams 42 can be improved, the construction speed is increased, and the floor plates 51 can be laid above the horizontal cross beams 42.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (4)
1. A precast beam for underground structure in reverse construction, comprising:
the size of the ring beams is matched with that of the upright post piles of the underground structure;
the two adjacent ring beams are connected through the horizontal beams, and the peripheral ring beams are also provided with the horizontal beams connected with the underground enclosure structure;
and the plurality of ring beams and the plurality of horizontal cross beams form an integral structure.
2. The precast beam of claim 1,
the inner side of the ring beam is provided with a dowel steel along the radial direction, and the joint of the upright post pile and the ring beam is provided with a shear-resistant stud.
3. The precast beam of claim 1,
and two sides of the horizontal beam are provided with horizontal anchoring reinforcing steel bars for being connected with the floor plates.
4. The precast beam of claim 1,
the utility model discloses a prefabricated beam, including prefabricated beam, ring beam, horizontal crossbeam, 8 peripheral ring beams of prefabricated beam, the ring beam is 9, is 3 rows of 3 rules and arranges, horizontal crossbeam is 24, and every ring beam all is connected with 4 horizontal crossbeams, still be provided with 12 horizontal crossbeams that stretch out outwards and be used for being connected with underground enclosure on 8 peripheral ring beams of prefabricated beam.
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| CN201921369668.8U CN211340847U (en) | 2019-08-22 | 2019-08-22 | Precast beam of underground structure in reverse construction method |
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| CN201921369668.8U CN211340847U (en) | 2019-08-22 | 2019-08-22 | Precast beam of underground structure in reverse construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031860A1 (en) * | 2019-08-22 | 2021-02-25 | 上海建工二建集团有限公司 | Beam lowering construction method of subsurface structure in top-down method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021031860A1 (en) * | 2019-08-22 | 2021-02-25 | 上海建工二建集团有限公司 | Beam lowering construction method of subsurface structure in top-down method |
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