CN216894442U - Multi-guide-hole combined excavation steel frame connecting device - Google Patents
Multi-guide-hole combined excavation steel frame connecting device Download PDFInfo
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- CN216894442U CN216894442U CN202220125164.7U CN202220125164U CN216894442U CN 216894442 U CN216894442 U CN 216894442U CN 202220125164 U CN202220125164 U CN 202220125164U CN 216894442 U CN216894442 U CN 216894442U
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Abstract
The utility model discloses a multi-pilot tunnel combined excavation steel frame connecting device which comprises a plurality of pilot tunnel primary supports, primary support buckle arch steel frames, a positioning connecting assembly for positioning the primary support buckle arch steel frames, a supporting assembly for supporting the primary support buckle arch steel frames and a backfilling assembly for backfilling concrete; the positioning and connecting assembly is connected between the inner side of the pilot tunnel primary support and the top of the primary support buckle arch steel frame, the supporting assembly is arranged in the primary support of the pilot tunnel and located on the lower end face of the primary support buckle arch steel frame, and the backfilling assembly is arranged in the primary support of the pilot tunnel and located on the upper end face of the primary support buckle arch steel frame. The position of the primary support buckle arch steel frame is well positioned through the positioning connecting assembly, the primary support buckle arch steel frame is accurately positioned, and the primary support buckle arch steel frame is stably connected with the primary support of the pilot tunnel; and a supporting component is arranged below the primary buckling arch steel frame, a backfilling component is arranged above the primary buckling arch steel frame, and the primary buckling arch in the pilot tunnel is dense in sprayed concrete, so that the quality is ensured.
Description
Technical Field
The utility model relates to the technical field of shallow-buried underground excavation subway construction, in particular to a multi-guide-hole combined excavation steel frame connecting device.
Background
With the rapid development of modern large and medium-sized cities, the common problems of large cities, such as dense buildings, crowded road traffic, complicated pipelines and the like, become the bottleneck of urban rail traffic development, and compared with open excavation construction, shallow-buried underground excavation construction has the advantages of strong adaptability, flexibility and the like. Compared with the underground excavation subway station subsection excavation construction method, the tunnel pile method has the main advantages that the settlement control effect on the earth surface is obvious, and the construction mechanization degree is high. When the hole pile method is adopted for construction, after the primary support construction of the side pilot hole is completed, the side piles and the side longitudinal beams are firstly constructed in the pilot hole, then the construction of primary support buckling arch steel frames is carried out, and the gap between the buckling arch in the side pilot hole and the primary support of the pilot hole is backfilled.
When the side guide hole primary support steel frame is constructed, due to the influence of factors such as construction errors of a guide hole grid steel frame, elevation deviation exists between a pre-buried steel plate on the grid steel frame and a connecting steel plate of a side buckle arch steel frame, hole positions of connecting bolts of the steel frame cannot be centered, and construction quality is affected. When the gap between the buckling arch in the side pilot hole and the primary support of the pilot hole is backfilled, if the buckling arch steel frame is a steel frame, a method of spraying concrete to the primary buckling arch firstly and then performing direct backfilling construction is adopted, so that the steel frame is easy to cause the phenomena of local incompactness or pseudo compactibility of the sprayed concrete; in addition, the conventional method of firstly spraying anchors and then pouring is very easy to influence the occupational health and personal safety of operators due to the narrow operation space and the large dust of sprayed concrete.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a multi-pilot hole combined excavation steel frame connecting device which is compact in sprayed concrete, stable in connection of primary support buckle arch steel frames and accurate in positioning.
The technical problem to be solved by the utility model can be realized by adopting the following technical scheme:
a multi-pilot tunnel combined excavation steel frame connecting device is characterized by comprising a plurality of pilot tunnel primary branches arranged in a subway tunnel, primary branch buckle arch steel frames obliquely striding over the inner middle parts of the primary branches of each pilot tunnel, a positioning connecting assembly for positioning the primary branch buckle arch steel frames, a supporting assembly for supporting the primary branch buckle arch steel frames, and a backfilling assembly for backfilling concrete;
the positioning and connecting assembly is connected between the inner side of the pilot tunnel primary support and the top of the primary support buckle arch steel frame, the supporting assembly is arranged in the primary support of the pilot tunnel and located on the lower end face of the primary support buckle arch steel frame, and the backfilling assembly is arranged in the primary support of the pilot tunnel and located on the upper end face of the primary support buckle arch steel frame.
In a preferred embodiment of the present invention, the positioning and connecting assembly includes a side pile disposed at an inner bottom corner of the primary support of the pilot tunnel, a side longitudinal beam vertically disposed at a side edge of the side pile, a bottom connecting steel plate connecting a bottom end of the primary support buckle arch steel frame to the side longitudinal beam, and a bottom positioning member fixing the bottom connecting steel plate to the side longitudinal beam;
the primary support buckle arch steel frame connecting surface of the side longitudinal beam is perpendicular to the axis of the primary support buckle arch steel frame, the bottom positioning piece comprises bottom positioning holes arranged at four corners of the bottom connecting steel plate and bottom positioning steel bars perpendicular to the axis of the primary support buckle arch steel frame, and the bottom positioning steel bars penetrate through the bottom positioning holes and fix the bottom connecting steel plate on the side longitudinal beam.
In a preferred embodiment of the present invention, the positioning and connecting assembly further includes a first top connecting steel plate pre-embedded in the pilot tunnel primary support, a second top connecting steel plate disposed at the top end of the primary support buckle arch steel frame, a pair of top positioning holes respectively disposed at four corners of the first top connecting steel plate and the second top connecting steel plate, and a top positioning steel bar perpendicular to the axis of the primary support buckle arch steel frame;
two ends of the top positioning steel bar respectively penetrate through the pair of top positioning holes, the second top connecting steel plate is fixed on the first top connecting steel plate, and then the top end of the primary support buckle arch steel frame is positioned on the primary support of the pilot tunnel; the connection surface of the primary support buckle arch steel frame of the primary support of the pilot tunnel is vertical to the axis of the primary support buckle arch steel frame, and the first top connection steel plate and the second top connection steel plate are vertical to the axis of the primary support buckle arch steel frame.
In a preferred embodiment of the present invention, the supporting component includes a steel form, a steel back rib, a main steel pipe and an auxiliary steel pipe, which are sequentially disposed on the lower end surface of the primary support arch steel frame, and are used for supporting the steel back rib; the steel template and the steel back rib are obliquely arranged in the primary support of the pilot tunnel in a spanning mode, the area range enclosed by the primary support of the pilot tunnel and the lower side end face of the steel back rib is a supporting area, the main steel pipe is horizontally or vertically arranged in the supporting area, and the auxiliary steel pipes are obliquely and alternately arranged in the supporting area.
In a preferred embodiment of the utility model, the backfill assembly comprises a pumping pipe for pumping concrete, at least one layer pouring line for pouring layer indication of the concrete, and a grouting pipe for grouting, wherein the region enclosed by the inner part of the pilot tunnel primary support and the upper side end surface of the primary support buckle arch steel frame is a backfill region;
the lower end of the pumping pipe extends into the supporting area, the middle of the pumping pipe penetrates through the primary support arch steel frame, the upper end of the pumping pipe extends into the backfill area, the layered pouring line is horizontally arranged in the backfill area and divides the backfill area into at least two sections equally along the vertical direction, and the grouting pipe is pre-buried on the inner side of the top of the primary support of the pilot tunnel.
In a preferred embodiment of the utility model, the inclination angle of the primary support arch steel frame ranges from 30 degrees to 60 degrees.
The beneficial effects of the utility model are: a multi-pilot tunnel combined excavation steel frame connecting device well positions primary support buckle arch steel frames through a positioning connecting assembly, the primary support buckle arch steel frames are accurately positioned and stably connected with primary pilot tunnels; and a support component is arranged below the primary buckling arch steel frame, a backfill component is arranged above the primary buckling arch steel frame, and the primary buckling arch in the pilot tunnel is dense in sprayed concrete, so that the quality is ensured.
The bottom of the primary support buckle arch steel frame is positioned and installed on the side longitudinal beam through a bottom positioning piece and a bottom connecting steel plate, the top of the primary support buckle arch steel frame is positioned and installed on the primary support of the guide hole through a top positioning steel bar, a first top connecting steel plate and a second top connecting steel plate, the primary support buckle arch steel frame is connected simply and conveniently in the side guide hole, and the positioning of the connecting steel plate in the primary support of the guide hole is more accurate.
Drawings
Fig. 1 is a schematic view of the installation of the primary support arch steel frame of the utility model.
Fig. 2 is a schematic structural view of a bottom-coupled steel plate according to the present invention.
Fig. 3 is a schematic structural view of a first top connection steel plate and a second top connection steel plate of the present invention.
Fig. 4 is a schematic structural view of an auxiliary second top connection steel plate according to the present invention.
Fig. 5 is a schematic structural view of the support assembly of the present invention.
Fig. 6 is a schematic structural diagram of a multi-tunnel combined excavation steel frame connection device of the utility model.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further explained below by combining the specific drawings.
Referring to fig. 1, 5 and 6, a multi-pilot tunnel combined excavation steel frame connecting device is shown, which comprises a plurality of pilot tunnel primary supports 100 arranged in a subway tunnel, primary support buckle arch steel frames 200 obliquely arranged in the middle of each pilot tunnel primary support 100 in a spanning manner, positioning connecting assemblies for positioning the primary support buckle arch steel frames 200, supporting assemblies 500 for supporting the primary support buckle arch steel frames 200, and a backfilling assembly 600 for backfilling concrete; the positioning connection assembly is connected between the inner side of the pilot tunnel primary support 100 and the top of the primary support buckle arch steel frame 200, the support assembly 500 is arranged inside the pilot tunnel primary support 100 and is positioned on the lower end face of the primary support buckle arch steel frame 200, and the backfill assembly 600 is arranged inside the pilot tunnel primary support 100 and is positioned on the upper end face of the primary support buckle arch steel frame 200. The position of the primary support buckle arch steel frame 200 is well positioned through the positioning connection assembly, the primary support buckle arch steel frame 200 is accurately positioned, and the primary support buckle arch steel frame 200 is stably connected with the primary support 100 of the pilot tunnel; the supporting component 500 is arranged below the primary arch steel frame 200, the backfilling component 600 is arranged above the primary arch steel frame 200, and the primary arch sprayed concrete in the pilot tunnel is dense and solid, so that the quality is guaranteed.
The cross section of the pilot hole primary support 100 is in an inverted U shape. The cross section of the primary support arch steel frame 200 is H-shaped, and the range of the inclination angle of the primary support arch steel frame 200 is 30-60 degrees; preferably, the inclination angle of the primary support arch steel frame 200 is 45 °. A plurality of tie bars 210 are vertically arranged in the backfill region and perpendicular to the primary support buckle arch steel frame 200, and two ends of each tie bar 210 are respectively embedded into the pilot hole primary support 100 and the primary support buckle arch steel frame 200 and welded to play a role in buckling the arch steel frame at the tie edge; preferably, the tie bars 210 are arranged in 5 strips side by side.
Referring to fig. 2, the positioning and connecting assembly includes a side pile 310 disposed at an inner bottom corner of the pilot tunnel primary support 100, a side longitudinal beam 320 vertically disposed at a side of the side pile 310, a bottom connecting steel plate 330 connecting a bottom end of the primary support buckle arched steel frame 200 to the side longitudinal beam 320, and a bottom positioning member fixing the bottom connecting steel plate 330 to the side longitudinal beam 320. The connection surface of the primary support buckle arch steel frame 200 of the side longitudinal beam 320 is vertical to the axis of the primary support buckle arch steel frame 200, and the bottom connection steel plate 330 is welded at the bottom end of the primary support buckle arch steel frame 200; the bottom positioning piece comprises bottom positioning holes 331 arranged at four corners of the bottom connecting steel plate 330 and bottom positioning steel bars 340 vertical to the axis of the primary buckle arch steel frame 200, and the bottom positioning holes 331 are 6 symmetrically arranged long strip kidney-shaped bolt holes; the bottom positioning steel bars 340 are symmetrically provided with 6 steel bars, which mainly play a role of fixing the bottom connecting steel plate 330, and the bottom positioning steel bars 340 penetrate through the bottom positioning holes 331 and fix the bottom connecting steel plate 330 on the side longitudinal beam 320.
With reference to fig. 3, the positioning and connecting assembly further includes a first top connecting steel plate 410 pre-embedded in the pilot tunnel primary support 100, a second top connecting steel plate 420 disposed at the top end of the primary support buckle arched steel frame 200, first top positioning holes 411 disposed at four corners of the first top connecting steel plate 410, second top positioning holes 421 disposed at four corners of the second top connecting steel plate 420, and top positioning steel bars 430 perpendicular to the axis of the primary support buckle arched steel frame 200; two ends of the top positioning steel bar 430 respectively penetrate through the pair of top positioning holes, the second top connecting steel plate 420 is fixed on the first top connecting steel plate 410, and then the top end of the primary support buckle arch steel frame 200 is positioned on the pilot tunnel primary support 100; the connection surface of the primary support buckle arched steel frame 200 of the pilot tunnel primary support 100 is perpendicular to the axis of the primary support buckle arched steel frame 200, and the first top connection steel plate 410 and the second top connection steel plate 420 are perpendicular to the axis of the primary support buckle arched steel frame 200.
Referring to fig. 4, the top positioning holes are formed at the joints of the first top connection steel plate 410 and the second top connection steel plate 420, and the first top positioning holes 411 and the second top positioning holes 421 are long-strip kidney-shaped bolt holes; an auxiliary second top connection steel plate 422 is further arranged at the lower left portion of the second top connection steel plate 420, 4 auxiliary second top positioning holes 423 are symmetrically arranged at four corners of the auxiliary second top connection steel plate 422, and the auxiliary second top positioning holes 423 are circular bolt holes. The top positioning reinforcing bars 430 sequentially pass through the first top positioning hole 411, the second top positioning hole 421 and the auxiliary second top positioning hole 423, the positions of the first top positioning hole 411 and the second top positioning hole 421 can be adjusted along the radial direction of the primary buckle arched steel frame 200, and the connection gaps of the kidney-shaped bolt holes are subjected to plug welding by using reinforcing bar heads 440 to restrain the relative displacement between the first top connection steel plate 410 and the second top connection steel plate 420.
The bottom end of the primary support buckle arched steel frame 200 is positioned and installed on the side longitudinal beam 320 through a bottom positioning piece and a bottom connecting steel plate 330, the top end of the primary support buckle arched steel frame 200 is positioned and installed on the primary support 100 of the pilot tunnel through a top positioning steel bar 430, a first top connecting steel plate 410 and a second top connecting steel plate 420, and the buckle arched steel frame in the pilot tunnel is simple and convenient to connect; and kidney-shaped bolt holes are formed in each connecting steel plate, so that the connection positioning between the bottom connecting steel plate 330 and the side longitudinal beam 320 and between the first top connecting steel plate 410 and the second top connecting steel plate 420 in the pilot hole primary support 100 is more accurate.
The support assembly 500 comprises a steel template 510, a steel back rib 520, a main steel pipe 530 and an auxiliary steel pipe 540 which are sequentially arranged on the end surface of the lower side of the primary support arch steel frame 200 and are used for supporting the steel back rib 520; the steel form 510 is formed by splicing a plurality of sections of steel plates, and the main steel pipes 530 comprise 5 groups of transverse main steel pipes and 3 groups of longitudinal main steel pipes; the auxiliary steel pipes 540 comprise first auxiliary steel pipes and second auxiliary steel pipes, one end of each first auxiliary steel pipe is connected to the lower end of the middle of the primary support buckle arch steel frame 200, the other end of each first auxiliary steel pipe is connected to the bottom corner of the primary support 100 of the pilot tunnel, one end of each second auxiliary steel pipe is connected to the bottom of the 1 st group of longitudinal main steel pipes at the outer corner of the side longitudinal beam 320, and the other end of each second auxiliary steel pipe is connected to the middle of the 3 rd group of longitudinal main steel pipes close to the primary support 100 of the pilot tunnel; two supplementary steel pipes 540 are steel pipe scaffold bridging, guarantee that scaffold overall structure is indeformable. The steel template 510 and the steel back rib 520 are obliquely arranged in the pilot tunnel primary support 100 in a spanning mode, the area range enclosed by the inner portion of the pilot tunnel primary support 100 and the lower side end face of the steel back rib 520 is a supporting area, the main steel pipe 530 is horizontally or vertically arranged in the supporting area, and the auxiliary steel pipes 540 are obliquely and crosswise arranged in the supporting area. The steel form 510, the steel backing rib 520, the main steel pipe 530 and the auxiliary steel pipe 540 are built to form a vertical supporting system, so that the vertical pumping pipe 610 is prevented from locally compacting the sprayed concrete and avoiding the pseudo-compaction phenomenon.
The backfill assembly 600 comprises a pumping pipe 610 for pumping concrete, at least one layered pouring line 620 for pouring layered indication of the concrete and a grouting pipe 630 for grouting, and the area enclosed by the inner part of the pilot tunnel primary support 100 and the upper side end face of the primary support buckle arch steel frame 200 is a backfill area. The lower end of the pumping pipe 610 extends into the supporting area, the middle part of the pumping pipe penetrates through the primary support arch steel frame 200, and the upper end of the pumping pipe extends into the backfilling area, so that concrete is directly poured into the backfilling area, sprayed concrete is not adopted, and the concrete is directly poured with good compactness. The layered pouring line 620 is horizontally arranged in the backfill region, and the backfill region is divided into at least two sections equally along the vertical direction, and the pouring height of each section is 0.4-2 m; preferably, the layered casting line 620 is provided with three sections, and the casting height of each section is 1.2 m. The grouting pipe 630 is a galvanized steel pipe with the size phi of 21.3 multiplied by 2.8mm, a hanging ring is fixedly installed on the inner side of the top of the pilot tunnel primary support 100 through a bolt, the grouting pipe 630 is pre-embedded at the vault position of the pilot tunnel primary support 100 through the hanging ring, and common silicate cement slurry is adopted for grouting. The filling area adopts layered pouring and vibration compaction, thereby preventing dust in the air from spreading when the concrete is sprayed, and ensuring good working environment.
The basic construction principle of the utility model is as follows:
1) constructing a side pile 310 and a side longitudinal beam 320 at the inner bottom corner of the pilot tunnel primary support 100; after the side piles 310 and the side longitudinal beams 320 are constructed, the bottom ends of the primary support buckle arched steel frames 200 are installed on the side longitudinal beams 320 through the bottom positioning pieces and the bottom connecting steel plates 330, and the top ends of the primary support buckle arched steel frames 200 are installed on the primary guide tunnel supports 100 through the top positioning steel bars 430, the first top connecting steel plates 410 and the second top connecting steel plates 420 in a positioning mode.
2) After the primary support steel frame is installed, arranging a plurality of tie bars 210 in a backfill region, laying primary support buckle arch steel mesh sheets, and vertically embedding two ends of the plurality of tie bars 210 into the pilot hole primary support 100 and the primary support buckle arch steel frame 200 respectively; a grouting pipe 630 is installed at the arch top of the backfill region of the pilot tunnel primary support 100, and a pumping pipe 610 is installed on the primary support buckle arch steel frame 200.
3) Installing a formwork support system, arranging a steel formwork 510 and a profile steel back rib on the lower side end face of the primary buckling arch steel frame 200, and arranging a main steel pipe 530, an auxiliary steel pipe 540 and a full scaffold in a support area.
4) Concrete is poured behind the primary support arch steel frame 200 (in a backfill area) by utilizing the pre-buried pumping pipes 610, so that backfill construction is carried out, wherein the backfill concrete is C35 commercial concrete; according to the layered pouring line 620, backfill construction is carried out by three layers of pouring with each layer of 1.2m, layered vibration is dense, and the template support system is subjected to stress checking calculation, so that compared with the process of firstly spraying concrete and then pouring backfill concrete, the curing time between the layered pouring concrete and the generation of construction cold gaps are reduced.
5) And the arch part of the backfill area is grouted by using the pre-embedded grouting pipe 630, and single-liquid cement slurry is adopted for grouting, so that no cavity is formed between the backfill area and the pilot tunnel primary support 100, and the space is fully filled.
The foregoing shows and describes the general principles, essential features, and advantages of the utility model. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents.
Claims (6)
1. A multi-pilot tunnel combined excavation steel frame connecting device is characterized by comprising a plurality of pilot tunnel primary branches arranged in a subway tunnel, primary branch buckle arch steel frames obliquely striding over the inner middle parts of the primary branches of each pilot tunnel, a positioning connecting assembly for positioning the primary branch buckle arch steel frames, a supporting assembly for supporting the primary branch buckle arch steel frames, and a backfilling assembly for backfilling concrete;
the positioning and connecting assembly is connected between the inner side of the pilot tunnel primary support and the top of the primary support buckle arch steel frame, the supporting assembly is arranged in the primary support of the pilot tunnel and located on the lower end face of the primary support buckle arch steel frame, and the backfilling assembly is arranged in the primary support of the pilot tunnel and located on the upper end face of the primary support buckle arch steel frame.
2. The multi-pilot tunnel combined excavation steel frame connecting device of claim 1, wherein the positioning and connecting assembly comprises side piles arranged at inner bottom corners of primary supports of the pilot tunnels, side longitudinal beams vertically arranged on the sides of the side piles, bottom connecting steel plates for connecting the bottom ends of the primary support buckling arch steel frames to the side longitudinal beams, and bottom positioning pieces for fixing the bottom connecting steel plates to the side longitudinal beams;
the primary support buckle arch steel frame connecting surface of the side longitudinal beam is perpendicular to the axis of the primary support buckle arch steel frame, the bottom positioning piece comprises bottom positioning holes arranged at four corners of the bottom connecting steel plate and bottom positioning steel bars perpendicular to the axis of the primary support buckle arch steel frame, and the bottom positioning steel bars penetrate through the bottom positioning holes and fix the bottom connecting steel plate on the side longitudinal beam.
3. The multi-pilot tunnel combined excavation steel frame connecting device of claim 2, wherein the positioning and connecting assembly further comprises a first top connecting steel plate pre-embedded in the pilot tunnel primary support, a second top connecting steel plate arranged at the top end of the primary support buckle arch steel frame, a pair of top positioning holes respectively arranged at four corners of the first top connecting steel plate and the second top connecting steel plate, and top positioning steel bars perpendicular to the axis of the primary support buckle arch steel frame;
two ends of the top positioning steel bars respectively penetrate through the pair of top positioning holes, the second top connecting steel plate is fixed on the first top connecting steel plate, and then the top end of the primary support buckle arch steel frame is positioned on the primary support of the guide hole; the connection surface of the primary support buckle arch steel frame of the primary support of the pilot tunnel is vertical to the axis of the primary support buckle arch steel frame, and the first top connection steel plate and the second top connection steel plate are vertical to the axis of the primary support buckle arch steel frame.
4. The multi-pilot tunnel combined excavation steel frame connecting device according to claim 3, wherein the supporting component comprises a steel form, a steel back rib, a main steel pipe and an auxiliary steel pipe, wherein the steel form, the steel back rib, the main steel pipe and the auxiliary steel pipe are sequentially arranged on the end face of the lower side of the primary support buckle arch steel frame; the steel template and the steel back rib are obliquely arranged in the primary support of the pilot tunnel in a spanning mode, the area range enclosed by the primary support of the pilot tunnel and the lower side end face of the steel back rib is a supporting area, the main steel pipe is horizontally or vertically arranged in the supporting area, and the auxiliary steel pipes are obliquely and alternately arranged in the supporting area.
5. The multi-pilot tunnel combined excavation steel frame connecting device of claim 4, wherein the backfill component comprises a pumping pipe for pumping concrete, at least one layer casting line for casting layer indication of concrete and a grouting pipe for grouting, and the area enclosed by the inner part of the pilot tunnel primary support and the upper side surface of the primary support buckling arched steel frame is a backfill area;
the lower end of the pumping pipe extends into the supporting area, the middle of the pumping pipe penetrates through the primary support arch steel frame, the upper end of the pumping pipe extends into the backfill area, the layered pouring line is horizontally arranged in the backfill area and divides the backfill area into at least two sections equally along the vertical direction, and the grouting pipe is pre-buried on the inner side of the top of the primary support of the pilot tunnel.
6. The multi-tunnel combined excavation steel frame connecting device of claim 5, wherein the inclination angle of the primary support arch steel frame ranges from 30 degrees to 60 degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220125164.7U CN216894442U (en) | 2022-01-18 | 2022-01-18 | Multi-guide-hole combined excavation steel frame connecting device |
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| CN202220125164.7U CN216894442U (en) | 2022-01-18 | 2022-01-18 | Multi-guide-hole combined excavation steel frame connecting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307176A (en) * | 2023-11-29 | 2023-12-29 | 中铁三局集团广东建设工程有限公司 | Transverse channel construction method based on formed pilot tunnel |
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2022
- 2022-01-18 CN CN202220125164.7U patent/CN216894442U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117307176A (en) * | 2023-11-29 | 2023-12-29 | 中铁三局集团广东建设工程有限公司 | Transverse channel construction method based on formed pilot tunnel |
| CN117307176B (en) * | 2023-11-29 | 2024-02-20 | 中铁三局集团广东建设工程有限公司 | Transverse channel construction method based on formed pilot tunnel |
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