TWI898750B - Grid beam unit and construction method using the same - Google Patents

Abstract

The present disclosure relates to a grid beam unit including a longitudinally rectangular concrete body, two first waffle slab bodies, multiple second waffle slab bodies, multiple first top plates, and multiple second top plates. The longitudinally rectangular concrete body extends along a first axis. The two first waffle slab bodies are respectively located at the two ends of the longitudinally rectangular concrete body and are U-shaped. The multiple second waffle slab bodies are spaced apart along the first axis at a predetermined distance, are located at both sides of the longitudinally rectangular concrete body, and are U-shaped. Each of the multiple first top plates is located on the outer side of the top end of the two first waffle slab bodies. Each of the multiple second top plates is connected to the top ends of adjacent multiple second waffle slab bodies.

Description

Lattice beam unit and construction method using lattice beam unit

The present disclosure relates to a lattice beam unit and a construction method using the lattice beam unit, and more particularly to a precast lattice beam unit and a construction method using the precast lattice beam unit.

Lattice slab structures are widely used in civil engineering and construction, particularly in manufacturing plant construction. High-tech manufacturing plants, such as wafer fabs, often utilize lattice slabs as the primary structure for mounting machinery and equipment. Due to their seismic resistance, lattice slabs are now commonly used in factory floor construction to meet the requirements of wafer fabs for stable installations of precision process equipment, requiring floor slabs to withstand even minor vibrations.

Using a precast grating structure, several precast concrete columns and various precast grating layers are assembled within each unit span. This reduces the construction period to the optimal expectation and significantly reduces the amount of on-site grating work required by the wafer fab, ensuring structural safety, compliance with design requirements, ease of transportation, rapid construction, and aesthetics. Precast grating structures offer the following advantages: Because the grating units are prefabricated, precision and flatness are easily controlled; the grating units are of high quality and uniformity; concrete is poured on-site, ensuring the gratings are fully bonded; the precast gratings are strong enough to support their own weight and construction loads; the only remaining on-site work is hoisting, eliminating the need for extensive scaffolding and improving construction flow; and the construction period is shortened.

However, since the grating slabs require numerous perforations and surrounding steel reinforcement to provide the required strength, the above construction method involves the setup of grating slab molds, reinforcement tie-downs, and formwork. Furthermore, construction must be carried out at a certain height above precast concrete columns, making the construction difficult and complex.

In view of the shortcomings of the aforementioned prior art, the industry has long awaited the provision of a systematic grating construction method that improves construction efficiency, as well as a grating structure constructed in accordance with this method, in order to effectively shorten the construction period for high-tech factories.

Therefore, to achieve the above-mentioned objectives, one aspect of the present disclosure relates to a lattice beam unit comprising an elongated concrete body, two first troughs, a plurality of second troughs, a plurality of first top plates, and a plurality of second top plates. The elongated concrete body extends along a first axis. The two first troughs are disposed at either end of the elongated concrete body and have a U-shape. The plurality of second troughs are disposed on either side of the elongated concrete body at a first predetermined distance and spaced apart along the first axis and have a U-shape. Each of the plurality of first top plates is disposed outside the top ends of the two first troughs. Each of the plurality of second top plates is connected to the top ends of the adjacent plurality of second troughs.

Another aspect of the present disclosure relates to a precast structure construction method, comprising: providing four columns at each of the four corners of a quadrilateral site extending in a first and a second axis substantially perpendicular to each other, and four semi-precast beams connecting the columns; providing a plurality of lattice beam units as described above; arranging each of the plurality of lattice beam units parallel to the first or second axis between the four semi-precast beams; interconnecting the plurality of lattice beam units and the plurality of lattice beam units with steel bars; and pouring concrete into the first and second troughs of the plurality of lattice beam units to form a lattice floor.

This approach involves arranging multiple lattice beam units between columns. By connecting them to the steel bars on the sides of the columns, a lattice plate structure is quickly formed between the columns, improving production efficiency and reducing construction time and costs.

10: Pillars

12: Pillars

14: Pillars

16: Pillar

18: Column

20: Semi-precast beams

21: Continuation

22: Semi-precast beams

23: Beam reinforcement

24: Semi-precast beams

26: Semi-precast beams

27: Continuation

30: Lattice beam unit

31: Long concrete body

32: First tank

33: First tank

34: Second tank

35: Second tank

36a: First Top Plate

36b: First Top Plate

37a: Second Top Plate

37b: Second top plate

38: First steel bar

39: Second steel bar

40: Lattice beam unit

41: Long concrete body

42: First tank

43: First tank

44: Second tank

45: Second tank

46a: First Top Plate

46b: First Top Plate

47a: Second Top Plate

47b: Second top plate

48: First Steel Bar

49: Second steel bar

50: Lattice beam unit

54: Second tank

55: Second tank

56a: First Top Plate

56b: First top plate

57a: Second Top Plate

57b: Second top plate

60: Lattice beam unit

64: Second tank

65: Second tank

66a: First Top Plate

66b: First Top Plate

67a: Second Top Plate

67b: Second top plate

70: Grid floor

71: Grid Slot

72: Grid Slot

73: Grid Slot

74: Grid Slot

75: Grid Slot

200: stirrups

220: stirrups

240: stirrups

260: stirrups

300: First set of stirrups

302: Second set of stirrups

310: Bottom

312: Lower part

320: First base plate

322: First side panel

324: First side panel

340: Second base plate

342: Second side panel

344: Second side panel

406: First Connector

408: Second Connector

409: Second Connector

506: First connector

508: Second connector

A1: First Axis

A2: Second Axis

D1: First scheduled distance

D2: Second scheduled distance

W1: Width

W2: Width

W3: Width

W4: Width

W5: Width

W6: Width

W7: Width

W8: Width

The following descriptions of the accompanying figures are for illustrative purposes only and are not intended to limit the scope of this disclosure in any way.

Figure 1 is a three-dimensional schematic diagram of the construction process according to the present disclosure.

Figure 2A is a perspective view of a first lattice beam unit according to an embodiment of the present disclosure.

Figure 2B is a second perspective view of the first lattice beam unit according to the above embodiment of the present disclosure.

Figure 2C is a front view of the first lattice beam unit according to the above embodiment of the present disclosure.

Figure 2D is a schematic top view of the first lattice beam unit according to the above embodiment of the present disclosure.

Figure 3A is a perspective view of a second lattice beam unit according to an embodiment of the present disclosure.

Figure 3B is a schematic top view of the second lattice beam unit according to the above embodiment of the present disclosure.

Figure 4A is a three-dimensional schematic diagram of the second construction process according to the above embodiment of the present disclosure.

Figure 4B is a schematic top view of Figure 4A.

Figure 4C is an enlarged schematic diagram of area A in Figure 4B.

Figure 4D is an enlarged schematic diagram of area B in Figure 4B.

Figure 5 is a three-dimensional schematic diagram of the third construction process according to the above embodiment of the present disclosure.

Figure 6A is a schematic cross-sectional view of the pre-cast structure according to the above embodiment of the present disclosure.

Figure 6B is a second schematic cross-sectional view of the pre-cast structure according to the above embodiment of the present disclosure.

Figure 7A is a three-dimensional schematic diagram of the fourth construction process according to the above embodiment of the present disclosure.

Figure 7B is a schematic top view of Figure 7A.

Figure 8A is a three-dimensional schematic diagram of the sixth construction process according to the above-mentioned embodiment of the present disclosure.

Figure 8B is a schematic top view of Figure 8A.

Figure 8C is another three-dimensional schematic diagram of the sixth construction process according to the above-mentioned embodiment of the present disclosure.

Figure 9 is a three-dimensional schematic diagram of the seventh construction process according to the above-mentioned embodiment of the present disclosure.

The following describes in detail various embodiments of the present disclosure with reference to the accompanying drawings. It should be noted that the contents of the embodiments herein are intended only to illustrate a specific aspect of the present disclosure and are not intended to limit the scope of the present disclosure. The dimensions and relative proportions of the components in the drawings are for illustrative purposes only. Unless the dimensions and relative proportions of the components are explicitly defined, they are not intended to limit the scope of the present disclosure.

Figure 1 is a schematic diagram illustrating a construction process according to an embodiment of the present disclosure. First, four columns 10, 12, 14, and 16 are provided at the four corners of a quadrilateral site extending along a first axis A1 and a second axis A2 that are substantially perpendicular to each other. Four semi-cast beams 20, 22, 24, and 26 are provided, respectively, to connect the four columns 10, 12, 14, and 16. The four semi-cast beams 20, 22, 24, and 26 surround a quadrilateral space within the space. The semi-cast beams 20, 22, 24, and 26 are each equipped with a plurality of stirrups 200, 220, 240, and 260, some of which are embedded within the body of the semi-cast beams 20, 22, 24, and 26, while the other portion (in a U-shaped pattern) protrudes from the top of the semi-cast beams 20, 22, 24, and 26. The inner sides of the semi-cast beams 20, 22, 24, and 26 have connecting sections 21 and 27 extending inward from the rectangular space for connecting the beam reinforcement. In some embodiments of the present disclosure, the columns 10, 12, 14, and 16 may be precast columns, prefabricated in a factory and then transported to the construction site for installation.

Figure 2A is a perspective view of a first lattice beam unit according to an embodiment of the present disclosure. Figure 2B is a perspective view of a first lattice beam unit according to the aforementioned embodiment of the present disclosure. Figure 2C is a front view of the first lattice beam unit according to the aforementioned embodiment of the present disclosure. Figure 2D is a schematic top view of the first lattice beam unit according to the aforementioned embodiment of the present disclosure. As shown in Figures 2A to 2D, the lattice beam unit 30 comprises an elongated concrete body 31, two first troughs 32 and 33, a plurality of second troughs 34 and 35, a plurality of first top plates 36a and 36b, and a plurality of second top plates 37a and 37b. In some embodiments of the present disclosure, the lattice beam unit is fabricated in a precast, one-piece manner by pouring concrete in a metal mold (not shown).

Please refer to Figures 2A to 2D. The elongated concrete body 31 extends along the first axis A1. Two first troughs 32 and 33 are respectively arranged at the two ends of the elongated concrete body 31, and each has a U-shape. In this embodiment, as shown in Figure 2B, taking the first trough 32 as an example, it includes a first bottom plate 320 and two first side plates 322 and 324. The first bottom plate 320 extends outward from the bottom 310 of the elongated concrete body 31 along the first axis A1. The first side plates 322 and 324 are respectively arranged on opposite sides of the first bottom plate 320 to jointly form a trough space. The top ends of the first side plates 322 and 324 are respectively connected to the first top plate 36a and the first top plate 36b located on the outside thereof. The first top plate 36a and the first top plate 36b are substantially parallel to the first bottom plate 320.

As shown in Figure 2D , the lattice beam unit 30 of this embodiment includes five second troughs 34 and five second troughs 35, spaced apart along a first axis A1 on either side of an elongated concrete body 31 at a first predetermined distance D1, forming a U-shape (see Figures 2A and 2B ). The plurality of second troughs 34 and 35 disposed on either side of the elongated concrete body are spaced apart along a second axis A2 at a second predetermined distance D2. In this embodiment, as shown in Figure 2B , the second trough 34, for example, includes a second bottom plate 340 and two second side plates 342 and 344. The second bottom plate 340 extends outward from the bottom 310 of the elongated concrete body 31 along the second axis A2 and is disposed parallel to the second trough 340, spaced apart by the first predetermined distance D1. Two second side panels 342 and 344 are disposed on opposite sides of the second base plate 340, with their top ends connected to the adjacent second top panel 37a or a side of the first top panel 36a. In this embodiment, the sides of each of the plurality of second top panels 37a are connected to the top ends of the two second side panels 342 and 344 of each of the adjacent plurality of second troughs 34; and the sides of each of the plurality of second top panels 37b are connected to the top ends of the two second side panels 342 and 344 of each of the adjacent plurality of second troughs 35.

As shown in FIG2D , a plurality of first top plates 36a (lower side of FIG2D ) and a first top plate 36b (upper side of FIG2D ) are respectively disposed on the outer sides of the top ends of the two first troughs 32 and 33. A plurality of second top plates 37a (lower side of FIG2D ) are respectively disposed on one side of the top end of the elongated concrete body 31 and are located between the plurality of adjacent second troughs 34. A plurality of second top plates 37b (upper side of FIG2D ) are respectively disposed on the other side of the top end of the elongated concrete body 31 and are located between the plurality of adjacent second troughs 35. In this embodiment, along the second axis A2, the width W1 of the first top plate 36a and the second top plate 37a of the lattice beam unit 30 is substantially equal to the width W2 of the first top plate 36b and the second top plate 37b.

As shown in Figure 2D , the lattice girder unit 30 further includes a plurality of first steel bars 38 and a plurality of second steel bars 39 . The plurality of first steel bars 38 extend along a first axial direction A1, penetrate a lower portion 312 of the elongated concrete body 31 (as shown in Figures 2B and 2C ), and are located within the two first troughs 32 and 33 . The plurality of second steel bars 39 extend along a second axial direction A2, penetrate the lower portion 312 of the elongated concrete body 31 (as shown in Figures 2B and 2C ), and are located within the plurality of second troughs 34 and 35 . In this embodiment, the lattice girder unit 30 includes two first steel bars 38 , and each second trough 34 and 35 contains two second steel bars 39 extending therethrough.

As shown in Figures 2A to 2D, the lattice beam unit 30 further includes a first set of stirrups 300, each of which has a portion embedded along a first axis A1 within the elongated concrete body 31 and the two first troughs 32 and 33. Another portion of each stirrup extends from the top of the elongated concrete body 31 and the tops of the two first troughs 32 and 33, forming a U-shape. The lattice beam unit 30 further includes a second set of stirrups 302, each of which has a portion embedded along a second axis A2 within the plurality of second troughs 34 and 35. Another portion of each stirrup extends from the tops of the plurality of second troughs 34 and 35, forming a U-shape.

Figure 3A is a perspective view of a second lattice beam unit according to an embodiment of the present disclosure. Figure 3B is a schematic top view of the second lattice beam unit according to the aforementioned embodiment of the present disclosure. The lattice beam unit 40 includes an elongated concrete body 41, two first troughs 42 and 43, a plurality of second troughs 44 and 45, a plurality of first top plates 46a and 46b, a plurality of second top plates 47a and 47b, a plurality of first steel bars 38, and a plurality of second steel bars 39. As shown in Figure 3B, the lattice beam unit 40 differs from one of the lattice beam units 30 in that the width W3 of the first and second top plates 46a and 47a along the second axis A2 is greater than the width W4 of the first and second top plates 46b and 47b. Furthermore, the first top plate 46b may have a notched corner 470, the shape of which may correspond to the edge of columns 10, 12, 14, and 16 shown in Figure 1. A plurality of first steel bars 48 extend along a first axis A1, penetrate the elongated concrete body 41, and are located within the two first troughs 42 and 43. A plurality of second steel bars 49 extend along a second axis A2, penetrate the elongated concrete body 41, and are located within the plurality of second troughs 44 and 45.

Figure 4A is a schematic perspective view of the second construction process according to the aforementioned embodiment of the present disclosure. In process two, a lattice beam unit 40 is placed between four semi-cast beams 20, 22, 24, and 26, parallel to the semi-cast beams 20 and 24. In this embodiment, the second trough 45 of the lattice beam unit 40 abuts against the semi-cast beam 20, while the first troughs 42 and 43 correspond to the beam sides of the semi-cast beams 22 and 26, respectively. The edges of the first top plates 46a and 46b and the plurality of second top plates 47b on the outer sides of the lattice beam unit 40 can overlap the top edges of the semi-cast beams 20, 22, and 26.

Figure 4B is a schematic top view of Figure 4A, Figure 4C is an enlarged schematic view of area A of Figure 4B, and Figure 4D is an enlarged schematic view of area B of Figure 4B. Referring to Figures 4A through 4D, the first steel bars 48 of the plurality of lattice beam units 40 are connected to the plurality of connecting segments 27 of the corresponding four semi-precast beams 22 and 26 along a first axis A1 via a plurality of first connectors 406. In this embodiment, the first steel bars 48 are connected to the plurality of connecting segments 21 of the corresponding semi-precast beams 20 via a plurality of second connectors 409 for rotational connection along a second axis A2.

Figure 5 is a three-dimensional schematic diagram of the third construction process according to the aforementioned embodiment of the present disclosure. The lattice beam unit 30 is placed between the four semi-cast beams 20, 22, 24, and 26, parallel to the semi-cast beams 20 and 24. In this embodiment, one side of the second trough 35 of the lattice beam unit 30 abuts parallel to the lattice beam unit 40. The second trough 35 of the lattice beam unit 30 and the second trough 44 of the lattice beam unit 40 are interconnected and correspond to each other, forming a common trough. Furthermore, the first troughs 32 and 33 of the lattice beam unit 30 correspond to the beam sides of the semi-cast beams 22 and 26, respectively.

Figure 6A is a first schematic cross-sectional view of a precast structure according to the aforementioned embodiment of the present disclosure. The second steel bars 39 and 49 of the lattice beam units 30 and 40 are connected to each other via a plurality of second connectors 408 and 409. The second connector 408 is located to the left of the second steel bar 49 within the second trough 44 and adjacent to the second steel bar 39. The second connector 409 is located to the right of the second steel bar 49 and has connected the plurality of connecting sections 21 of the semi-precast beam 20. Figure 6B is a second schematic cross-sectional view of a precast structure according to the aforementioned embodiment of the present disclosure. The second connector 408 begins to rotate and move to the left as shown in the previous figure, so that it connects with the second steel bar 39 located in the second slot 35 of the lattice beam unit 30.

Figure 7A is a schematic three-dimensional diagram of a fourth construction process according to the aforementioned embodiment of the present disclosure. In this embodiment, a lattice beam unit 50 is placed parallel to and between the four semi-precast beams 20, 22, 24, and 26. Figure 7B is a schematic top view of Figure 7A. One side of the lattice beam unit 50 rests parallel to the lattice beam unit 30. The lattice beam unit 50 is connected to the connecting sections 27 of the semi-precast beams 22 and 26 via first connectors 506, and is then connected to the lattice beam unit 30 via second connectors 508. In this embodiment, the structure of the lattice beam unit 50 is the same as that of the lattice beam unit 30. That is, along the second axis A2, the width W5 of the first top plate 56a and the second top plate 57a of the lattice beam unit 50 is equal to the width W6 of the first top plate 56b and the second top plate 57b.

Figure 8A is a schematic perspective view of construction process six according to the aforementioned embodiment of the present disclosure. Figure 8B is a schematic top view of construction process six according to the aforementioned embodiment of the present disclosure. A lattice beam unit 60 is positioned between the four semi-cast beams 20, 22, 24, and 26, parallel to the semi-cast beams 20 and 24. In this embodiment, one long side of the lattice beam unit 60 along the first axis A1 abuts against the lattice beam unit 50, while its opposite side abuts against the semi-cast beam 24. The short sides of the lattice beam unit 60 abut against the opposing semi-cast beams 22 and 26. In this embodiment, the structure of the lattice beam unit 60 is similar to that of the lattice beam unit 40. Specifically, as shown in FIG8B , along the second axis A2, the width W7 of the first top plate 66a and the second top plate 67a of the lattice beam unit 60 is smaller than the width W8 of the first top plate 66b and the second top plate 67b.

Figure 8C is another three-dimensional schematic diagram of the sixth construction process according to the aforementioned embodiment of the present disclosure. Adjacent lattice beam units 30, 40, 50, and 60 abut against each other, allowing the grooves between their respective second troughs 34, 35, 44, 45, 54, 55, 64, and 65 to connect, or abut against the semi-precast beams 20, 22, 24, and 26, forming a plurality of lattice grooves 71, 72, 73, 74, and 75.

Refer to Figure 8A . After construction step six, construction step seven proceeds: concrete is poured into the first and second troughs of the plurality of lattice beam units 30, 40, 50, and 60. Concrete can also be poured simultaneously to cover the first and second stirrups 300, 302 on the protruding lattice beam units 30, 40, 50, and 60, as well as the stirrups 200, 220, 240, and 260 on the semi-cast beams 20, 22, 24, and 26, thereby forming a lattice floor 70 as shown in Figure 9 . Next, concrete is poured on the columns 10, 12, 14, and 16 to form the four columns 18 corresponding to the lattice floor 70.

The terms "a" or "an" are used herein to describe elements and components of the present disclosure. This terminology is used merely for convenience and to provide a basic understanding of the present disclosure. This description should be understood to include one or at least one, and unless otherwise expressly stated, the singular also includes the plural. When used with the word "comprising" in the patent claims, the term "a" or "an" may mean one or more than one. In addition, the term "or" herein is synonymous with "and/or."

Unless otherwise specified, spatial descriptions such as "above," "below," "upward," "left," "right," "downward," "body," "base," "vertical," "horizontal," "side," "higher," "lower," "upper," "above," and "below" are intended to refer to the directions shown in the figures. It should be understood that the spatial descriptions used herein are for illustrative purposes only, and that actual implementations of the structures described herein can be spatially configured in any relative orientation without altering the advantages of the disclosed embodiments. For example, in the description of some embodiments, providing an element "on" another element can encompass both the situation where the preceding element is directly on (e.g., physically in contact with) the subsequent element and the situation where one or more intervening elements are located between the preceding element and the subsequent element.

As used herein, the terms "substantially," "substantially," "approximately," and "approximately" are used to describe and take into account minor variations. When used in conjunction with an event or circumstance, these terms may refer to both the occurrence of the event or circumstance as well as the occurrence of the event or circumstance that is very approximately the same.

This disclosure is not limited to the specific structures or configurations disclosed herein. Those skilled in the art will appreciate that these structures and configurations disclosed herein may be modified or permuted to some extent within the spirit of this disclosure. It should also be understood that the terminology and terms describing directions or relative positions used herein are intended solely to describe specific embodiments and facilitate illustration and understanding and are not intended to limit the scope of this disclosure.

10: Pillars

12: Pillars

14: Pillars

16: Pillar

20: Semi-precast beams

22: Semi-precast beams

24: Semi-precast beams

26: Semi-precast beams

30: Lattice beam unit

40: Lattice beam unit

50: Lattice beam unit

60: Lattice beam unit

66a: First Top Plate

66b: First Top Plate

67a: Second Top Plate

67b: Second top plate

200: stirrups

220: stirrups

240: stirrups

260: stirrups

A1: First Axis

A2: Second Axis

Claims (10)

A lattice beam unit comprises: an elongated concrete body extending along a first axis; two first troughs, each disposed at two ends of the elongated concrete body and having a U-shape; a plurality of second troughs, spaced apart from each other along the first axis at a first predetermined distance, and having a U-shape; a plurality of first top plates, each disposed on an outer side of the top ends of the two first troughs; and a plurality of second top plates, each connected to the top ends of adjacent second troughs. The lattice beam unit of claim 1 further comprises: a plurality of first steel bars extending along the first axis, penetrating a lower portion of the elongated concrete body, and located inside the two first troughs. The lattice beam unit of claim 2 further comprises: a plurality of second steel bars extending along a second axis perpendicular to the first axis, penetrating the lower portion of the elongated concrete body, and located in the plurality of second troughs. A lattice beam unit as claimed in claim 1 or 2, wherein the two first troughs respectively include: a first bottom plate extending from a bottom of the main body along the first axis; and two first side plates respectively arranged on opposite sides of the first bottom plate. A lattice beam unit as claimed in claim 3, wherein each of the plurality of second troughs comprises: a second bottom plate extending from a bottom of the body along a second axis perpendicular to the first axis and arranged in parallel and spaced apart; and two second side plates respectively arranged on opposite sides of the second bottom plate; wherein the sides of each of the plurality of first top plates or the plurality of second top plates are connected to the top ends of the two second side plates of each of the adjacent plurality of second troughs; wherein the plurality of second troughs arranged on both sides of the elongated concrete body are spaced a second predetermined distance apart from each other along the second axis. The lattice beam unit of claim 5 further comprises: a first set of stirrups, a portion of each of which is embedded in the elongated concrete body and the two first troughs, and another portion of each of which protrudes from the top of the elongated concrete body and the top of the two first troughs. The lattice beam unit of claim 6 further comprises: a second set of stirrups, a portion of each of which is embedded in the plurality of second troughs, and another portion of each of which protrudes from the top of the plurality of second troughs. A construction method comprises: providing four columns at four corners of a plane of a quadrilateral construction site extending in a first axis and a second axis substantially perpendicular to each other, and four semi-precast beams respectively connected to the columns; providing a plurality of lattice beam units as described in claim 7; arranging each of the plurality of lattice beam units between the four semi-precast beams in a manner parallel to the first axis or the second axis; interconnecting the steel bars between the plurality of lattice beam units and between the plurality of lattice beam units and the four semi-precast beams; and pouring concrete in the first troughs and the second troughs of the plurality of lattice beam units to form a lattice floor. The construction method of claim 8, wherein the step of connecting the plurality of lattice beam units and the plurality of lattice beam units to the steel bars of the four semi-precast beams includes: connecting the plurality of first steel bars to the plurality of beam steel bars of two corresponding semi-precast beams through a plurality of first connectors. A construction method as claimed in claim 8 or 9, wherein the step of connecting the steel bars between the plurality of lattice beam units and between the plurality of lattice beam units and the four semi-precast beams includes connecting the plurality of second steel bars of the plurality of lattice beam units to each other or to the plurality of beam steel bars of the other two of the corresponding four semi-precast beams through a plurality of second connectors.