CN210598989U - 3D prints steel fiber concrete tunnel and just props up grid bow member - Google Patents
3D prints steel fiber concrete tunnel and just props up grid bow member Download PDFInfo
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- CN210598989U CN210598989U CN201920390488.1U CN201920390488U CN210598989U CN 210598989 U CN210598989 U CN 210598989U CN 201920390488 U CN201920390488 U CN 201920390488U CN 210598989 U CN210598989 U CN 210598989U
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Abstract
A3D printing steel fiber concrete tunnel primary support grid arch center is divided into a plurality of unit sections along the extension direction of the arch center, and each unit section is integrally printed by 3D printing equipment; the unit section comprises a 3D printing outer support guard plate, a 3D printing reinforcing support, a 3D printing inner side support and a 3D printing bolt connecting plate; the 3D prints bolted connection board and locates the head and the tail both ends of every unit festival, and the diaphragm of two L shaped plates of two adjacent unit festival homonymies is interconnected, forms whole bow member. The steel fiber concrete outer supporting guard plate has large stress area, can bear the pressure of surrounding rocks more effectively than the main reinforcement of the grid steel frame, and can effectively ensure the stress performance of the primary supporting member; the integral manufacturing of the printing form of the 3D printer is adopted, the self weight of the primary support member of the grid steel arch frame is lighter, so that the hoisting cost can be effectively reduced by facilitating hoisting and mounting, manual welding and processing of the grid steel frame on the traditional primary support site are avoided, and the labor cost and the construction period are reduced.
Description
Technical Field
The utility model relates to a tunnel construction technical field, concretely relates to 3D that can be used for undercut tunnel construction prints steel fiber concrete tunnel and just props up grid bow member, is applicable to various undercut tunnel constructions that need adopt preliminary bracing.
Background
Along with the rapid development of economy and the continuous improvement of urbanization level, the development of underground space becomes one of the main directions of present urban space development, and the undercut structure is also more and more, and the undercut tunnel occupies the important position as the main component part of urban underground space development, and the excavation tunnel preliminary bracing most all adopts the grid steelframe construction at present, has following problem:
the construction precision of the grid steel frame is poor, and the strength loss of the steel bar is serious: at present, grid steel frames are all processed and manufactured on a construction site, construction precision is difficult to guarantee, two connecting plates of the grid steel frames are often staggered, so that bolts are difficult to screw in, and meanwhile, when supporting ribs inside the grid steel frames are processed, bending forming is directly adopted on site, so that the strength of the reinforcing ribs is seriously reduced, and construction risks are increased;
secondly, the grid steel frame is big by oneself, and the workman is under construction the difficulty: when the grid steel frames are erected, workers are difficult to adjust and erect due to the fact that the sectional weight of each grid steel frame is large, and the construction speed is reduced; recently, a steel grating which is arranged in sections is provided, and though the steel grating is convenient to carry, the complexity of construction is increased;
thirdly, the grid steel frame is processed by steel bars, and the construction cost is high: because the main ribs, the zigzag ribs, the bolt connecting plates and other materials of the grid steel frame are all made of steel bars and steels, the construction cost is higher.
Meanwhile, a large amount of preliminary bracing factory prefabrication researches are carried out at present in China, but the preliminary bracing prefabrication can only be prefabricated into concrete slabs, the dead weight is large, and hoisting, transportation and installation are difficult.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a 3D prints steel fiber concrete tunnel and just props up grid bow member, aim at solve the grid steelframe as tunnel preliminary bracing bow member construction precision poor, the reinforcing bar intensity loss is serious, from great, workman construction difficulty, the high technical problem of cost to and the prefabricated bow member of current concrete can only prefabricate the finished product board, from great, hoist and mount transportation and the all difficult technical problem of installation.
With the wide application of the 3D printing technology in building engineering, compared with the traditional building industry, the 3D printed building can save 30% -60% of building materials, shorten 50% -70% of construction period and reduce 50% -80% of manpower, but the existing 3D printed concrete structure has the defects of poor crack resistance, poor durability and the like, and is not suitable for permanent components such as a structural outer wall, but the tunnel primary support arch frame is used as a temporary component, the requirement on crack resistance is low, the modeling is complex, and although prefabrication is difficult to complete in a factory, the 3D printing technology can be perfectly printed and molded, and the defect of 3D printing is avoided.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
the utility model provides a 3D prints steel fiber concrete tunnel and just props up grid bow member which characterized in that:
dividing the arch into a plurality of unit sections along the extension direction of the arch, wherein each unit section is integrally printed by 3D printing equipment;
the unit section comprises a 3D printing outer support guard plate, a 3D printing reinforcing support, a 3D printing inner side support and a 3D printing bolt connecting plate;
the 3D printing outer supporting guard plate is of a batten structure and is arranged on the outermost side;
the 3D printing inner side support comprises two support rods which are arranged in parallel and arranged on the inner side, and the surface formed by the two support rods is parallel to the surface of the 3D printing outer support guard plate;
the 3D printing reinforcing supports also comprise two parallel 3D printing reinforcing supports, the inner sides of the two parallel 3D printing reinforcing supports are respectively and integrally connected with the edges of the two sides of the 3D printing outer supporting guard plate, the outer sides of the two parallel 3D printing reinforcing supports are respectively and integrally connected with the two 3D printing inner side supports, and the two parallel planes are perpendicular to the plate surface of the 3D printing outer supporting guard plate;
the 3D prints bolted connection board and locates the head and the tail both ends of every unit festival, including corresponding two L shaped plates that set up in both sides, the diaphragm of two L shaped plates of two adjacent unit festival homonymies is interconnected, forms whole bow member.
As the utility model discloses a preferred technical scheme, in whole bow member, 3D prints outer backplate and forms closed door arch frame plate structure, including bottom plane board and top arch shaped plate, bottom plane board length suits with tunnel bottom surface width, the face and the tunnel internal surface of top arch shaped plate are parallel.
Further, in the whole arch center, 3D prints inboard support and forms two parallel arrangement's closed door arch bars, including the inboard bracing piece in bottom and the inboard bracing piece in top, the inboard bracing piece in bottom is the straight line pole, the inboard bracing piece in top is the arch bar, and two 3D print the cambered surface that the inboard support formed and be parallel with the face that the 3D that corresponds the position printed outer backplate all the time.
Further, the distance between the bottom inner support bar and the bottom plane plate is equal to the distance between the top inner support bar and the top arched plate.
Furthermore, bolt preformed holes are formed in transverse plates of the L-shaped plates, and the transverse plates of the two L-shaped plates are connected through bolts.
Further, the 3D printing reinforcing support is an S-shaped support or a Z-shaped support in a plane.
Compared with the prior art, the utility model discloses a technical advantage lies in:
1. the construction precision is high, no strength loss: the utility model discloses a 3D prints the whole preparation of form, each unit festival size specification control is accurate, rely on 3D to print bolted connection board and carry out the accurate connection of unit festival, the construction precision is high, the grid steelframe has been avoided and the preparation is processed at the job site, the problem that the construction precision is difficult to guarantee, and adopt the bending shaping during reinforcing bar preparation, the condition that reinforcing bar intensity reduces seriously, can print the preliminary bracing component of various sizes according to the engineering, the printing precision is high, the construction quality is easy to guarantee for the preliminary bracing of grid steel bow member, the component is linked and can be pinpointed, do benefit to the stability that tunnel excavation was strutted;
2. the dead weight is little, the cost is low: the utility model adopts the 3D printing form to be integrally manufactured, the self weight of the primary support member is lighter than that of the grating steel arch, the self weight is about 60 percent lighter, the hoisting and the installation are convenient, the hoisting cost can be effectively reduced, and the 3D printing form has better economic benefit compared with the primary support of the grating steel arch; the problems that the traditional grid steel frame is processed by steel bars and the manufacturing cost is high are solved;
3. the segmental assembly is convenient for construction and transportation: the assembling construction is carried out while the printing, the transportation and the installation are carried out in sections, the construction speed is high, the labor cost is saved, the manual welding and the processing of the grid steel frame on the traditional primary support site are avoided, and the labor cost and the construction period are reduced; the primary support of the steel arch frame of the grating is easy to transport, install and position and is easy to finely adjust;
4. high strength and good stress performance: the utility model discloses steel fiber concrete material's outer backplate lifting surface area is big, can more effectively bear the country rock pressure than grid steelframe owner muscle, can effectively guarantee the atress performance of preliminary bracing component.
To sum up, the utility model discloses be favorable to the popularization and application of 3D printing technique in the underground works, play the promotion effect for the industrialization and the industrialization of underground works.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are given by way of illustration only and not by way of limitation, wherein:
fig. 1 is an isometric view of a 3D printed steel fiber concrete tunnel primary grid arch of the present invention;
FIG. 2 is a front view of FIG. 1;
FIG. 3 is a side view of FIG. 1;
fig. 4 is a partially enlarged schematic view of the connection portion of two unit sections according to the present invention.
Reference numerals: the printing device comprises a 1-3D printing outer support guard plate, a 1.1-bottom plane plate, a 1.2-top arch plate, a 2-3D printing Z-shaped inner support, a 3-3D printing inner support, a 3.1-bottom inner support rod, a 3.2-top inner support rod, a 4-3D printing bolt connecting plate, a 4.1-L-shaped plate and a 4.2-bolt preformed hole.
Detailed Description
Hereinafter, embodiments of the 3D printed steel fiber concrete tunnel primary grid arch of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof. It should be noted that for the sake of clarity in showing the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. As shown in fig. 1-4, a 3D printing steel fiber concrete tunnel primary grid arch is divided into a plurality of unit sections along the extending direction of the arch, and each unit section is integrally printed by a 3D printing device; the unit section comprises a 3D printing outer support guard plate 1, a 3D printing reinforcing support 2, a 3D printing inner side support 3 and a 3D printing bolt connecting plate 4; the 3D printing outer support guard plate 1 is of a batten structure and is arranged on the outermost side; the 3D printing inner side support 3 comprises two support rods which are arranged in parallel and arranged on the inner side, and the surface formed by the two support rods is parallel to the surface of the 3D printing outer support guard plate 1; the 3D printing reinforcing supports 2 also comprise two parallel printing reinforcing supports, the inner sides of the two parallel printing reinforcing supports are respectively and integrally connected with the edges of the two sides of the 3D printing outer supporting plate 1, the outer sides of the two parallel printing reinforcing supports are respectively and integrally connected with the two 3D printing inner side supports 3, and the two parallel planes are perpendicular to the plate surface of the 3D printing outer supporting plate 1; as shown in fig. 4, the 3D printing bolt connecting plates 4 are arranged at the head and tail ends of each unit section, and comprise two L-shaped plates 4.1 correspondingly arranged at the two sides, and transverse plates of the two L-shaped plates 4.1 at the same side of the two adjacent unit sections are connected with each other to form an integral arch. Bolt preformed holes 4.2 are formed in transverse plates of the L-shaped plates 4.1, and the transverse plates of the two L-shaped plates 4.1 are connected through bolts. The 3D printing reinforcing support 2 is an S-shaped support or a Z-shaped support in a plane.
In the integral arch frame, the 3D printed outer support protection plate 1 forms a closed door arch-shaped frame plate structure and comprises a bottom plane plate 1.1 and a top arch plate 1.2, the length of the bottom plane plate 1.1 is matched with the width of the bottom surface of the tunnel, and the surface of the top arch plate 1.2 is parallel to the inner surface of the tunnel; d, printing the inner side supports 3 to form two closed door arch-shaped rods which are arranged in parallel, wherein the two closed door arch-shaped rods comprise a bottom inner side support rod 3.1 and a top inner side support rod 3.2, and the cambered surfaces formed by the two 3D printing inner side supports 3 are always parallel to the plate surfaces of the 3D printing outer support guard plates 1 at the corresponding positions; the distance between the bottom inner support bar 3.1 and the bottom planar plate 1.1 is equal to the distance between the top inner support bar 3.2 and the top arched plate 1.2.
The construction method of the 3D printing steel fiber concrete tunnel primary support grid arch center comprises the following steps:
step one, material preparation: preparing 3D printing equipment and a steel fiber concrete printing material; the steel fiber concrete printing material comprises self-compacting concrete and a steel fiber material, and in order to avoid steel fiber agglomeration, the steel fiber material does not participate in the stirring process of the self-compacting concrete, the self-compacting concrete is prepared and stirred firstly, and then the self-compacting concrete and the steel fiber material simultaneously enter the 3D printing equipment to be printed. The diameter range of the steel fiber material is 0.1-20 mm, and the length range is 0.5-500 mm; the self-compacting concrete comprises 355-367 parts of 42.5-grade cement, 724-748 parts of medium sand with the fineness modulus of 2.85, 885-915 parts of crushed stone with the particle size of 5-16 mm, 77-87 parts of II-grade fly ash, 103-119 parts of mineral powder, 26-32 parts of silica fume, 14-20 parts of a high-efficiency polycarboxylic acid water reducing agent and 157-171 parts of water.
Step two, determining the size and the section mode: determining the size of each component of the 3D printing arch according to the size of the tunnel to be supported, and simultaneously determining a sectioning mode;
step three, determining a printing model: determining a construction drawing according to the size and the section dividing mode determined in the step two, and establishing a printing model;
step three, printing each unit section: starting 3D printing equipment, integrally printing each unit section respectively and maintaining;
step four, transporting unit sections: transporting the unit sections printed in the step three to a construction site; adding materials layer by adopting a mode of layered printing and superposition forming to generate unit sections;
step five, integrally assembling in place: placing each unit section into the excavated groove section, assembling while installing, and fixedly connecting adjacent unit sections by using bolts;
step six, carrying out subsequent construction: and spraying concrete and excavating a soil body, so that the 3D printing of the steel fiber concrete tunnel primary support grid arch frame construction is completed.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather by the claims and their equivalents.
Claims (6)
1. The utility model provides a 3D prints steel fiber concrete tunnel and just props up grid bow member which characterized in that:
dividing the arch into a plurality of unit sections along the extension direction of the arch, wherein each unit section is integrally printed by 3D printing equipment;
the unit section comprises a 3D printing outer support plate (1), a 3D printing reinforcing support (2), a 3D printing inner side support (3) and a 3D printing bolt connecting plate (4);
the 3D printing outer support guard plate (1) is of a batten structure and is arranged on the outermost side;
the 3D printing inner side support (3) comprises two support rods which are arranged in parallel and arranged on the inner side, and the surface formed by the two support rods is parallel to the surface of the 3D printing outer support guard plate (1);
the 3D printing reinforcing supports (2) also comprise two parallel supports, the inner sides of the two parallel supports are respectively and integrally connected with the two side edges of the 3D printing outer supporting plate (1), the outer sides of the two parallel supports are respectively and integrally connected with the two 3D printing inner side supports (3), and the two parallel planes are perpendicular to the plate surface of the 3D printing outer supporting plate (1);
the head and the tail ends of each unit section are arranged on the 3D printing bolt connecting plate (4), and the transverse plates of the two L-shaped plates (4.1) on the same side of the two adjacent unit sections are connected with each other to form an integral arch frame.
2. The 3D printing steel fiber concrete tunnel primary grid arch according to claim 1, characterized in that: in the whole arch center, the 3D printing outer support protection plate (1) forms a closed door arch-shaped frame plate structure and comprises a bottom plane plate (1.1) and a top arch plate (1.2), the length of the bottom plane plate (1.1) is matched with the width of the bottom surface of the tunnel, and the surface of the top arch plate (1.2) is parallel to the inner surface of the tunnel.
3. The 3D printing steel fiber concrete tunnel primary grid arch according to claim 1 or 2, wherein: in whole bow member, 3D prints inboard support (3) and forms two parallel arrangement's closed door arch bar, including bottom inboard bracing piece (3.1) and top inboard bracing piece (3.2), bottom inboard bracing piece (3.1) are the linear pole, top inboard bracing piece (3.2) are the arch bar, and the cambered surface that two 3D printed inboard support (3) and formed is parallel with the face that 3D printed outer backplate (1) that corresponds the position all the time.
4. The 3D printing steel fiber concrete tunnel primary grid arch according to claim 3, wherein: the distance between the bottom inner side supporting rod (3.1) and the bottom plane plate (1.1) is equal to the distance between the top inner side supporting rod (3.2) and the top arch plate (1.2).
5. The 3D printing steel fiber concrete tunnel primary grid arch according to claim 1, characterized in that: bolt preformed holes (4.2) are formed in transverse plates of the L-shaped plates (4.1), and the transverse plates of the two L-shaped plates (4.1) are connected through bolts.
6. The 3D printing steel fiber concrete tunnel primary grid arch according to claim 1, characterized in that: the 3D printing reinforcing support (2) is an S-shaped support or a Z-shaped support in a plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920390488.1U CN210598989U (en) | 2019-03-26 | 2019-03-26 | 3D prints steel fiber concrete tunnel and just props up grid bow member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920390488.1U CN210598989U (en) | 2019-03-26 | 2019-03-26 | 3D prints steel fiber concrete tunnel and just props up grid bow member |
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| Publication Number | Publication Date |
|---|---|
| CN210598989U true CN210598989U (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920390488.1U Expired - Fee Related CN210598989U (en) | 2019-03-26 | 2019-03-26 | 3D prints steel fiber concrete tunnel and just props up grid bow member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159299A (en) * | 2019-03-26 | 2019-08-23 | 中国建筑股份有限公司 | The first branch grillage in 3D printing steel fiber reinforced concrete tunnel and its construction method |
-
2019
- 2019-03-26 CN CN201920390488.1U patent/CN210598989U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110159299A (en) * | 2019-03-26 | 2019-08-23 | 中国建筑股份有限公司 | The first branch grillage in 3D printing steel fiber reinforced concrete tunnel and its construction method |
| CN110159299B (en) * | 2019-03-26 | 2024-04-09 | 中国建筑股份有限公司 | Primary support grid arch frame of 3D printing steel fiber concrete tunnel and construction method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200522 |