CN102888812B - Wood and concrete combined type box beam - Google Patents

Abstract

The invention discloses a wood and concrete combined box girder, which comprises a concrete top slab, a concrete bottom slab, and two wooden webs respectively arranged on the left and right sides between the concrete top slab and the concrete bottom slab; the longitudinal lengths of the concrete top slab and the concrete bottom slab are equal. It is consistent with the span of the box girder to be constructed, and the width of both is consistent with the width of the transverse bridge of the box girder to be constructed; Composed of wooden boards, and multiple long strips of wooden boards are fastened and connected by multiple prestressed steel beams; multiple long strips of wooden boards are laid on the same plane, and the top of each long strip of wooden boards is fixed on the concrete roof and its bottom Fastened to a concrete base. The invention has reasonable structural design, convenient transportation and installation, short construction period, less climate influence, good use effect, can make full use of the physical and mechanical properties of wood, and solve various problems existing in the existing prestressed concrete box girder.

Description

A wood and concrete composite box girder

technical field

The invention relates to a box girder, in particular to a wood and concrete combined box girder.

Background technique

Prestressed concrete box girders have good structural properties and are widely used in various modern bridges. In medium and long-span prestressed concrete bridges, prestressed concrete box girders, especially thin-walled box-shaped beams, have high torsional rigidity and good stability during actual construction and use. , and because the top and bottom slabs have large concrete areas, they can effectively resist positive and negative bending moments, and meet the requirements of reinforcement, and can adapt to structures with positive and negative bending moments. In addition, prestressed concrete box girders can also adapt to the requirements of modern construction methods.

However, the top and bottom slabs of the prestressed concrete box girders used today are all concrete top and bottom slabs. In the actual construction process, due to the large volume of the concrete roof and floor, its transportation and installation are not convenient; secondly, the concrete roof and floor are easy to crack, and often work with cracks, so the construction is difficult, quality defects are prone to occur, and reinforcement and maintenance are difficult. In addition, the construction of concrete roof and floor is greatly affected by the climate, especially the low temperature in winter has a great influence on the setting effect of concrete, and its durability has not been popularized in underdeveloped areas. At the same time, the curing and hardening period of the concrete roof and floor is long, and the construction period is long.

Contents of the invention

The technical problem to be solved by the present invention is to provide a wood-concrete combined box girder, which has a reasonable structural design, convenient transportation and installation, a short construction period, and is less affected by the climate. Well, the physical and mechanical properties of wood can be fully utilized, and various defects and deficiencies existing in the existing prestressed concrete box girder can be effectively solved.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a wood and concrete combined box girder, characterized in that it includes a concrete roof, a concrete bottom plate directly below the concrete roof, and two The wooden webs on the left and right sides between the bottom slabs, the concrete top slab and the concrete bottom slab are arranged horizontally, and the two wooden webs are arranged symmetrically; The spans of the beams are consistent, and the widths of both are consistent with the transverse width of the constructed box girder; A rectangular composite board composed of multi-strip-shaped wooden boards, and multiple strip-shaped wooden boards are fastened and connected as a whole through multiple prestressed steel beams; multiple strip-shaped wooden boards are laid on the same plane, and multiple long The strip-shaped wooden boards are arranged obliquely from top to bottom; the tops of the multiple strip-shaped wooden boards are all fixed on the concrete top plate, and the bottoms of the multiple strip-shaped wooden boards are all fixed on the concrete bottom plate.

The above-mentioned wood and concrete combined box girder is characterized in that: the tops of the two wooden webs and the concrete roof are fastened and connected by a plurality of threaded steel bar connectors, and the two wooden webs The bottom of the slab and the concrete bottom slab are all fastened and connected by threaded steel bar connectors 2.

The above-mentioned wood and concrete combined box girder is characterized in that: multiple prestressed steel beams are arranged on the same row or arranged in multiple rows on the left and right, and there are multiple openings on the wooden web correspondingly for multiple The pre-drilled tunnel through which the prestressed steel beam passes, and the left and right ends of the prestressed steel beam are anchored by anchor plates.

The above-mentioned wood and concrete combined box girder is characterized in that: a plurality of threaded steel bar connectors are pre-embedded in the bottom of the concrete roof from front to back, and the top of the wooden web is correspondingly opened with a plurality of respectively The tunnels for the installation of multiple threaded steel bar connectors, the top heights of the multiple threaded steel bar connectors are all lower than the top surface height of the concrete roof; the multiple threaded steel bar connectors are respectively filled an adhesive in one of the plurality of channels is fixed in the wooden web;

A plurality of threaded steel bar connectors 2 are pre-embedded on the top of the concrete floor from front to back, and the bottom of the wooden web is correspondingly provided with a plurality of tunnels 2 respectively for the installation of a plurality of threaded steel bar connectors 2, The heights of the bottom ends of the plurality of threaded steel bar connectors 2 are all higher than the height of the bottom surface of the concrete floor; the plurality of threaded steel bar connectors 2 are respectively fixed on the wooden web by the adhesive filled in the plurality of channels 2 Inside.

The aforementioned wood and concrete combined box girder is characterized in that: the first threaded steel bar connector and the second threaded steel bar connector are both scissor-shaped connectors formed by bending and connecting two threaded steel bars.

The above-mentioned wood and concrete combined box girder is characterized in that: the diameters of the two threaded steel bars used in the threaded steel bar connector one are the same, and the aperture of the first channel is larger than the diameter of the threaded steel bar connection. The diameter of the threaded steel bars used in part one is at least 1mm larger; the diameters of the two threaded steel bars used in the second threaded steel bar connector are the same, and the diameter of the second channel is larger than that of the second threaded steel bar connector. The diameter of the threaded steel bar used in the steel bar is at least 1mm larger.

The above-mentioned combined wood and concrete box girder is characterized in that: the left-right width of the multiple strip-shaped wooden boards is the same, and the left-right width of the multiple strip-shaped wooden boards is the same as that of the laminated wooden boards. Same thickness.

The above-mentioned combined wood and concrete box girder is characterized in that: a plurality of threaded steel bar connectors are evenly arranged on the bottom of the concrete roof, and a plurality of said threaded steel bar connectors are evenly arranged on the top of the concrete bottom plate.

The above-mentioned wood and concrete combined box girder is characterized in that: multiple prestressed steel beams are arranged on the same plane; the thickness of the wooden web is 38 mm to 76 mm; The diameters of the threaded steel bars used in the second threaded steel bar connector are Φ12mm-Φ24mm.

The above-mentioned combined wood and concrete box girder is characterized in that: the concrete top slab and the concrete bottom slab are prefabricated concrete slabs processed in the prefabrication yard in advance, and the thickness of the concrete top slab and the concrete bottom slab are both 18mm-56mm.

Compared with the prior art, the present invention has the following advantages:

1. The structure is simple, the design is reasonable, the construction is convenient, the construction cost is low, and the construction speed is fast.

2. The prestressed laminated wood board is used instead of the concrete web, and the design is reasonable, which reduces the self-weight of the box girder and facilitates transportation and installation. Secondly, there is no need for curing and hardening, and the construction period is relatively short and less affected by the climate. During actual construction, the concrete top slab and the concrete bottom slab can be prefabricated, that is, the production process of the concrete top slab and the concrete bottom slab is completed in the prefabrication yard.

3. The use effect is good, the prestressed laminated wood board has a strong ability to transmit loads, and has good durability under repeated heavy loads. In addition, the waterproof performance of the prestressed laminated wood board is also better; in addition, it also makes the bridge have a strong aesthetic feeling.

4. It can make full use of the physical and mechanical properties of wood, effectively combine the two materials of wood and concrete, maximize the strengths and avoid weaknesses, improve the stability of the structure and the use efficiency of materials, and solve the problems existing in the existing prestressed concrete box girder It is an economical, reasonable and efficient box girder structure with various defects.

To sum up, the present invention has reasonable structural design, convenient transportation and installation, short construction period, less impact by climate, good use effect, can make full use of the physical and mechanical properties of wood, and can effectively solve the problem of existing prestressed concrete boxes. The beams have many defects and deficiencies such as inconvenient transportation and installation, easy cracking of the concrete roof and floor, difficult construction and difficult reinforcement and maintenance, construction is greatly affected by the climate, and the construction period is long.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the present invention.

Fig. 2 is a structural schematic view of the laminated boards used in the present invention.

Fig. 3 is a schematic diagram of the connection state between the concrete top plate and the wooden web used in the present invention.

Fig. 4 is a reference diagram of the use state of the anchor plate used in the present invention.

Explanation of reference signs:

1-1—concrete top slab; 1-2—concrete bottom slab; 2—wooden web;

3—anchor spindle plate; 4—prestressed steel beam;

5-1—threaded steel bar connector one; 5-2—hole one;

5-3—Adhesive filling layer 1; 6—Laminated wood boards;

7—fastening bolts; 8—rectangular backing plate.

Detailed ways

As shown in Figures 1 and 2, the present invention includes a concrete roof 1-1, a concrete floor 1-2 directly below the concrete roof 1-1, and two concrete roofs 1-1 and 1-2 respectively. The wooden webs 2 on the left and right sides of the room, the concrete top plate 1-1 and the concrete bottom plate 1-2 are arranged horizontally, and the two wooden webs 2 are arranged symmetrically. Both the longitudinal length of the concrete top plate 1-1 and the concrete bottom plate 1-2 are consistent with the span of the constructed box girder, and the widths of both are consistent with the transverse width of the constructed box girder. The wooden web 2 is a laminated wooden board 6, and the laminated wooden board 6 is a rectangular composite board composed of a plurality of strip-shaped wooden boards assembled side by side, and the plurality of strip-shaped wooden boards are passed through multiple pre-processes. The stress steel beam 4 is fastened and connected as a whole. The plurality of strip-shaped wooden boards are arranged on the same plane, and the plurality of strip-shaped wooden boards are arranged obliquely from top to bottom. The tops of the plurality of elongated planks are all fixed on the concrete top plate 1-1, and the bottoms of the plurality of elongated planks are all fixed on the concrete bottom plate 1-2.

In this embodiment, the transverse width and thickness of the plurality of strip-shaped wooden boards in the laminated wooden boards 6 are the same. During actual construction, the height and length of the laminated wooden boards 6 can be adjusted accordingly to meet the requirements of different bridges simply by selecting different longitudinal lengths and quantities of the strip-shaped wooden boards.

In actual use, the bridges to which the present invention is applicable are bridges with small and medium spans, and the spans of bridges with small and medium spans are generally 5m to 40m. Therefore, in this embodiment, the longitudinal length of the wooden web 2 is generally 5m-40m.

In this embodiment, the plurality of strip-shaped wooden boards in the laminated wooden boards 6 are fastened and connected by using multiple channels of the prestressed steel beams 4 to pre-apply lateral compressive stress, which not only has a simple structure, is convenient to manufacture and Good stress effect. During actual construction, multiple prestressed steel beams 4 are arranged in the same column or arranged in multiple columns on the left and right, and the wooden web 2 is correspondingly provided with pre-drilled holes for the prestressed steel beams 4 to pass through. And the left and right ends of the prestressed steel beam 4 are all anchored by the anchor plate 3 . In addition, the number of laminated layers of the laminated wooden board 6 (that is, the number of the plurality of strip-shaped wooden boards forming the laminated wooden board 6 ) is determined by the length requirement of the actual project for the constructed box girder.

At the same time, according to the thickness of the laminated plank 6 and the span of the box girder to be constructed, the number of columns of prestressed steel tendons 4 to be laid is adjusted accordingly. When the thickness of the laminated plank 6 is greater, the number of columns of prestressed steel tendons 4 is greater; and vice versa. And when the span of the box girder to be constructed is larger, the number of rows of prestressed steel tendons 4 to be laid is larger; and vice versa. In this embodiment, multiple channels of prestressed steel tendons 4 are arranged on the same column. During actual construction, the plurality of prestressed steel tendons 4 can also be laid out in two rows on the left and right.

When actually constructing the prestressed steel beams 4, the prestressed steel beams 4 are passed through the pre-drilled holes provided in the laminated wooden boards 6, and then the two ends of the prestressed steel beams 4 are laid on the laminated wooden boards The anchor spindle plate 3 on the left and right sides of 6 is anchored. At the same time, the prestressed steel beam 4 needs to be treated with anticorrosion first, and the anticorrosion treatment method is the same as that of conventional prestressed steel bars.

4, in this embodiment, the anchor plate 3 includes a channel steel arranged on the side of the laminated wooden board 6, and the channel steel is provided with a hole for the prestressed steel bundle 4 to pass through, and the prestressed After the steel beam 4 passes through the hole, it is fixed with fastening bolts 7, and a rectangular backing plate 8 is placed between the fastening bolts 7 and the channel steel.

With reference to Fig. 3, in this embodiment, the tops of the two wooden webs 2 and the concrete roof 1-1 are fastened and connected by a plurality of threaded steel bar connectors 5-1, and the two wooden webs Both the bottom of the web 2 and the concrete bottom slab 1-2 are fastened and connected through the threaded steel bar connector 2.

In this embodiment, a plurality of threaded steel bar connectors 5-1 are pre-embedded at the bottom of the concrete roof 1-1 from front to back, and the top of the wooden web 2 is correspondingly provided with a plurality of The threaded reinforcement connecting piece 5-1 is installed in the tunnel 5-2, and the top heights of the multiple threaded steel connecting pieces 5-1 are all lower than the top surface height of the concrete roof 1-1. The plurality of threaded steel bar connectors-5-1 are respectively fixed in the wooden web 2 by the adhesive filled in the plurality of channels-5-2.

A plurality of threaded steel bar connectors 2 are pre-embedded on the top of the concrete floor 1-2 from front to back, and the bottom of the wooden web 2 is correspondingly provided with a plurality of threaded steel bar connectors 2 for installation. The height of the bottom of the multiple threaded steel bar connectors 2 is higher than the height of the bottom of the concrete bottom plate 1-2. The plurality of threaded steel bar connectors 2 are respectively fixed in the wooden web 2 by the adhesive filled in the plurality of holes 2 respectively.

In this embodiment, the first threaded steel bar connector 5-1 and the second threaded steel bar connector are scissor-shaped connectors formed by bending and connecting two threaded steel bars.

During actual processing and production, the diameters of the two threaded steel bars used in the threaded steel bar connector 5-1 are the same, and the aperture of the tunnel 5-2 is smaller than that of the threaded steel bar connector 5-1. The diameter of the rebar used in 1 is at least 1mm larger. The two threaded steel bars used in the second threaded steel bar connector have the same diameter, and the hole diameter of the second channel is at least 1 mm larger than the diameter of the threaded steel bar used in the second threaded steel bar connector.

In this embodiment, the left and right widths of the multiple elongated wooden boards are the same, and the left and right widths of the multiple elongated wooden boards are all the same as the thickness of the laminated wooden boards 6 .

In actual processing, the purpose of adjusting the longitudinal length of the laminated wooden boards 6 can be easily achieved only by adjusting the longitudinal length and quantity of the strip-shaped wooden boards, so as to meet the use requirements of bridges with different spans. In this embodiment, the strip-shaped wooden board is a full-length wooden board.

In this embodiment, a plurality of threaded steel bar connectors 1 5-1 are evenly arranged on the bottom of the concrete roof 1-1, and a plurality of said threaded steel bar connectors 2 are evenly arranged on the top of the concrete bottom slab 1-2.

When actually constructing a plurality of threaded steel bar connectors 1-5-1, it is only necessary to insert the threaded steel bar connector 1-5-1 pre-buried at the bottom of the concrete roof 1-1 into the top of the wooden web 2 corresponding to the opening In the tunnel one 5-2, the inside of the tunnel one 5-2 is filled with adhesive, and an adhesive filling layer one for fastening and fixing the threaded steel bar connector one 5-1 in the wooden web 2 is formed 5-3. Correspondingly, when constructing a plurality of said shear connectors 2, it is only necessary to insert the threaded steel connectors 2 pre-buried on the top of the concrete floor 1-2 into the corresponding openings at the bottom of the wooden web 2. Then, fill the inside of the second channel with adhesive to form an adhesive filling layer two for fastening and fixing the second threaded steel bar connector in the wooden web 2.

To sum up, the plurality of threaded steel bar connectors 5-1 are fixed before pouring the concrete roof 1-1, and the plurality of threaded steel bar connectors 1-5-1 are combined with the concrete roof 1-1 during the solidification and hardening process. The concrete top plate 1-1 is tightly connected as one; correspondingly, the multiple threaded steel bar connectors 2 are fixed before pouring the concrete bottom plate 1-2, and the multiple threaded steel bar connectors 2 are condensed on the concrete bottom plate 1-2 During the hardening process, it is tightly connected with the concrete bottom plate 1-2 as a whole. During actual construction, the multiple threaded steel bar connectors 1 5-1 and the multiple threaded steel bar connectors 2 can also be fixed by other fixing methods.

During actual construction, different types of adhesives may be used as adhesives. In this embodiment, the adhesive is a two-component polyurethane adhesive. In actual use, the selection of the adhesive 5-3 is related to the manufacturing process and the load borne by the threaded steel bar.

During actual construction, according to the actual needs of the fixed connection, the distance between the upper and lower adjacent two threaded steel bar connectors 1 5-1 and the upper and lower adjacent two described threaded steel bar connectors 2 is adjusted, and when the upper and lower The smaller the distance between two adjacent threaded steel bar connectors 1 5-1 and the upper and lower adjacent two threaded steel bar connectors 2, the steel web 2 and wooden top plate 1-1 and wooden bottom plate 1 The connection quality between -2 is more reliable; and vice versa.

In this embodiment, the multiple threaded steel bar connectors 1 5-1 are arranged on the same straight line, and correspondingly, the multiple threaded steel bar connectors 2 are also arranged on the same straight line. During actual installation, a plurality of said threaded steel bar connectors 1 5-1 and a plurality of said threaded steel bar connectors 2 can also be arranged in a left and right cross, like this, a plurality of said threaded steel bar connectors 1 5-1 are laid on On a zigzag line, correspondingly, a plurality of said threaded reinforcing bar connectors 2 are also arranged on a zigzag line. That is to say, a plurality of threaded steel bar connectors 1 5-1 are staggered or arranged along a straight line at a certain interval on the wooden web 2; correspondingly, a plurality of said threaded steel bar connectors 2 are arranged 2. The bottoms are arranged in a staggered manner according to a certain interval or along a straight line.

In this embodiment, in order to pour the adhesive evenly, a groove is respectively opened along the length direction of the first threaded steel bar connector 5-1 and the second threaded steel bar connector. In the actual construction process, the adhesive can also be evenly applied with a brush along the channel one and along the length direction of the threaded steel bar connector one 5-1; similarly, a brush can also be used along the channel two and along the threaded steel bar Apply the adhesive evenly along the length direction of the second connecting piece.

In this embodiment, multiple prestressed steel tendons 4 are arranged on the same plane, that is to say, multiple prestressed steel tendons 4 are arranged on the same row. The thickness of the wooden web 2 is 38 mm to 76 mm, and the diameters of the threaded steel bars used in the first threaded steel bar connector 5-1 and the second threaded steel bar connector are both Φ12 mm to Φ24 mm.

In this embodiment, the concrete top slab 1-1 and the concrete bottom slab 1-2 are prefabricated concrete slabs processed in advance in the prefabrication field, and the thickness of the concrete top slab 1-1 and the concrete bottom slab 1-2 are both 18 mm to 56 mm .

During actual construction, the board thickness of the wooden web 2, the concrete top plate 1-1 and the concrete bottom plate 1-2, the threaded steel bar connector 1 5-1 and the screw thread used in the threaded steel bar connector 2 can be adjusted according to specific needs. The diameter of the reinforcing bar and the diameters of the first through hole 5-2 and the second through hole are adjusted accordingly.

During specific processing, the specifications and sizes of the first threaded steel bar connector 5-1 and the second threaded steel bar connector should be based on the importance of the box girder structure to be constructed, the load characteristics, the connection method, the working environment and the wooden web. The thickness of the board 2 and other factors are considered comprehensively, and standard connectors are used.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (10)

1. A wood and concrete combined box girder is characterized in that: it comprises a concrete roof (1-1), a concrete bottom plate (1-2) directly below the concrete roof (1-1) and two respectively laid on the concrete roof (1-1). The wooden webs (2) on the left and right sides between the top plate (1-1) and the concrete bottom plate (1-2), the concrete top plate (1-1) and the concrete bottom plate (1-2) are arranged horizontally, and the two The two wooden webs (2) are symmetrically arranged left and right; the longitudinal lengths of the concrete top plate (1-1) and the concrete bottom plate (1-2) are consistent with the span of the constructed box girder, and the width of the two All are consistent with the width of the transverse bridge of the box girder being constructed; the wooden web (2) is a laminated plank (6), and the laminated plank (6) is a plurality of elongated planks assembled side by side composed of rectangular composite boards, and multiple strip-shaped wooden boards are fastened and connected as a whole through multiple prestressed steel beams (4); multiple strip-shaped wooden boards are arranged on the same plane, and multiple strip-shaped wooden boards are arranged on the same plane, and multiple strip-shaped wooden boards The strip-shaped wooden boards are arranged inclined from top to bottom; the tops of the plurality of strip-shaped wooden boards are all fixed on the concrete roof (1-1), and the bottoms of the plurality of strip-shaped wooden boards are all fixed on the concrete on the bottom plate (1-2). 2. A kind of wood and concrete combined box girder according to claim 1, characterized in that: between the tops of the two wooden webs (2) and the concrete roof (1-1), a plurality of screw threads The first steel bar connector (5-1) is fastened and connected, and the bottoms of the two wooden webs (2) and the concrete bottom plate (1-2) are both fastened and connected through the second threaded steel bar connector. 3. according to claim 1 or 2 described a kind of wood and concrete combined type box girder, it is characterized in that: multiple said prestressed steel strands (4) are arranged on the same column or left and right are divided into multiple columns and arranged, so The wooden web (2) is correspondingly provided with a plurality of pre-drilled holes for the passage of multiple prestressed steel beams (4), and the left and right ends of the prestressed steel beams (4) pass through the anchor The plate (3) is anchored. 4. A wood-concrete combined box girder according to claim 2, characterized in that: a plurality of threaded steel bar connectors (5-1) are pre-embedded in the concrete roof (1-1) from front to back ), and the top of the wooden web (2) correspondingly has a plurality of channels one (5-2) for the installation of a plurality of threaded steel bar connectors one (5-1) respectively, and the plurality of said The height of the top of the threaded steel bar connector one (5-1) is lower than the top surface height of the concrete roof (1-1); The adhesive in the channel one (5-2) is fixed in the wooden web (2); A plurality of threaded steel bar connectors 2 are pre-embedded on the top of the concrete floor (1-2) from front to back, and the bottom of the wooden web (2) is correspondingly provided with a plurality of threaded steel bars respectively. The channel 2 where the connector 2 is installed, the height of the bottom end of the multiple threaded steel bar connectors 2 is higher than the height of the bottom surface of the concrete floor (1-2); The adhesive in the second hole is fixed in the wooden web (2). 5. according to the described a kind of wood and concrete combined box girder of claim 4, it is characterized in that: described threaded steel bar connector one (5-1) and described threaded steel bar connector two, are all made of two screw threads A scissor-like connection formed when the bars are bent and connected to each other. 6. according to a kind of wood and concrete combined box girder according to claim 5, it is characterized in that: the diameters of two described threaded steel bars adopted in the described threaded steel bar connector one (5-1) are all the same, And the diameter of the tunnel one (5-2) is at least 1 mm larger than the diameter of the threaded steel bars used in the threaded steel bar connector one (5-1); the two threaded steel bars used in the second threaded steel bar connector The diameters of the threaded steel bars are the same, and the hole diameter of the second channel is at least 1 mm larger than the diameter of the threaded steel bars used in the second threaded steel bar connector. 7. According to claim 1 or 2, a kind of wood and concrete combined box girder is characterized in that: the left and right widths of the plurality of strip-shaped planks are the same, and the width of the plurality of strip-shaped planks is the same. The left and right widths are the same as the thickness of the laminated planks (6). 8. according to a kind of wood and concrete combined box girder according to claim 2, it is characterized in that: a plurality of said threaded steel bar connectors one (5-1) are evenly arranged on the bottom of the concrete roof (1-1), And a plurality of said threaded steel bar connectors 2 are evenly arranged on the top of the concrete bottom plate (1-2). 9. A kind of wood and concrete combined box girder according to claim 5, characterized in that: a plurality of said prestressed steel beams (4) are arranged on the same plane; said wooden web (2) plate The thickness is 38 mm to 76 mm, and the diameters of the threaded steel bars used in the first threaded steel bar connector (5-1) and the second threaded steel bar connector are both Φ12 mm to Φ24 mm. 10. A wood-concrete combined box girder according to claim 9, characterized in that: said concrete top plate (1-1) and concrete bottom plate (1-2) are pre-processed concrete in the precast yard The prefabricated slab, and the thickness of the concrete top slab (1-1) and the concrete bottom slab (1-2) are both 18mm-56mm.

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