阅读说明：本技术 一种地铁区间停车线大断面暗挖施工初支进洞加固结构 (Subway interval stop line large section undercut construction is first propped up into hole reinforced structure ) 是由 岳爱敏 刘航 彭明玉 史磊磊 林树望 贾硕 齐鑫刚 王东海 张世峰 于 2019-09-16 设计创作，主要内容包括：本发明公开了一种地铁区间停车线大断面暗挖施工初支进洞加固结构,包括设置在横通道的断面初期支护,设置在横道底面的横道初支；设置在横道中部的风道临时仰拱,设置在区间正线马头门范围外轮廓的框梁,以及设置在框梁内的单洞双线大断面、单洞单线标准断面；框梁为“门”型结构,框梁与横通道的侧壁连接；在马头门范围外轮廓增设“门”型框梁,能够使区间正线马头门处受力体系顺利转换,将负载转移至框梁上,有效地保证施工安全。(The invention discloses a large-section underground excavation construction primary support hole entering reinforcing structure for a stop line in a subway section, which comprises a section primary support arranged on a transverse passage and a transverse passage primary support arranged on the bottom surface of the transverse passage; the air duct temporary inverted arch is arranged in the middle of the cross channel, the frame beam is arranged in the outline of the interval normal line ingate range, and the single-hole double-line large section and the single-hole single-line standard section are arranged in the frame beam; the frame beam is of a door-shaped structure and is connected with the side wall of the transverse channel; the 'door' frame beam is additionally arranged on the outer contour of the ingate range, so that a stress system at the ingate position of the interval positive line can be smoothly converted, the load is transferred to the frame beam, and the construction safety is effectively ensured.)

1. a large-section underground excavation construction primary support hole entering reinforcing structure for a stop line in a subway section comprises a section primary support (1) arranged on a transverse passage and a transverse passage primary support (2) arranged on the bottom surface of the transverse passage; the air duct temporary inverted arch (3) is arranged in the middle of the cross road, the frame beam (4) is arranged in the outline of the interval normal line ingate range, and the single-hole double-line large section (6) and the single-hole single-line standard section (7) are arranged in the frame beam (4);

The frame beam (4) is of a door-shaped structure, and the frame beam (4) is connected with the side wall of the transverse channel;

The frame beam (4) comprises a support column (41), a support beam (42) and an oblique beam (43), and the bottom of the support column (41) is connected with a bottom plate grid of the primary support (2) of the cross road; the supporting beam (42) is arranged at the bottom of the air duct temporary inverted arch (3), the supporting column (41) penetrates through the air duct temporary inverted arch (3) and the supporting beam (42), and the supporting column (41) and the supporting beam (42) form a rectangular structure; the oblique beam (43) is arranged on the supporting column (41) and used for supporting the bottom surface of the supporting beam (42).

2. the large-section underground excavation construction primary support hole entering reinforcing structure of the stop line between the subway sections according to claim 1, wherein the section primary support (1) is installed on the side wall of the cross passage through a connecting member; the connecting component comprises embedded steel bars (51) and connecting bars (52), the embedded steel bars (51) are buried underground on the side wall of the transverse passage and used for installing the section preliminary bracing (1), and the connecting bars (52) are used for reinforcing and connecting the connection between the embedded steel bars (51) and the section preliminary bracing (1).

3. The large-section underground excavation construction primary support hole entering reinforcing structure of the stop line in the subway section according to claim 2, wherein the mounting steps of the section primary support (1) are as follows: pre-embedding a pre-embedded steel bar piece (51) on the side wall of the transverse channel, and reserving a position in the pre-embedded steel bar piece (51) for placing double-spliced I-shaped steel in a later period; then after the section primary support (1) is welded firmly, the connecting rib (52) is welded below the connection of the embedded steel bar piece (51) and the section primary support (1) at an angle of 60 degrees with the horizontal plane, and two ends of the connecting rib (52) are respectively welded on the embedded steel bar piece (51) and the section primary support (1); and then welding reinforcing mesh sheets in a triangular frame formed by the connecting ribs (52), the embedded reinforcing steel bar pieces (51) and the section primary support (1) through expansion bolts, and spraying concrete to the triangular frame area.

4. The large-section underground excavation construction primary support hole entering reinforcing structure of the stop line between the subway section and the subway section according to claim 1, wherein a lifting hook (31) is pre-buried on the air duct temporary inverted arch (3), and the lifting hook (31) can be used for installing a lifting beam.

5. The large-section underground excavation construction primary support hole entering reinforcing structure for the stop line in the subway section according to claim 1, wherein the bottoms of the supporting columns (41) are connected with a bottom plate grid of the transverse channel in an electric welding mode.

6. The large-section underground excavation construction primary support hole entering reinforcing structure for the stop line in the subway section according to claim 1, wherein after the frame beam (4) is erected, cement mortar is adopted to fill and compact the gap between the frame beam and the side wall of the construction cross channel.

Technical Field

the invention relates to the technical field of subway construction and construction, in particular to a primary support hole-entering reinforcing structure for large-section underground excavation construction of a stop line in a subway region.

Background

the underground excavation method is that the ground is not excavated and the underground excavation mode is adopted for construction. Although the construction technology of urban tunnels and underground engineering by the shallow-buried underground excavation method is mature, due to the uncertainty of engineering hydrogeological conditions and the complexity of construction environments, a plurality of construction risks still exist in the construction process of underground engineering by the shallow-buried underground excavation method, and a plurality of risk accidents also occur.

The subway is a form of railway transportation and refers to an urban rail transit system mainly operated underground; in subway construction, the excavation width of a single-hole double-line large-section tunnel in a subway main line tunnel is larger, so that the horse head construction of an underground excavation interval is a safety risk source, and the construction safety can be endangered if the horse head construction is improperly handled. After the earthwork is excavated, the soil layer is released in stress and is easy to deform and collapse, and the early-stage support in the construction needs to be timely supported, so that the construction safety is ensured, and the operation space is provided.

the deformation risk of cave collapse can exist when the shallow bias tunnel construction of burying of big section advances the hole, and whole tunnel extrusion unstability hidden danger is high, consequently should make the body of a cave stability reinforcement measure at the work progress, has guaranteed the normal construction safety of tunnel.

Disclosure of Invention

Aiming at the problems, the invention provides a high-stability reinforcing structure for a large-section underground excavation construction primary support entering hole of a stop line in a subway section.

The technical scheme of the invention is as follows: a large-section underground excavation construction primary support hole entering reinforcing structure of a stop line in a subway section comprises a section primary support arranged on a transverse channel and a transverse channel primary support arranged on the bottom surface of the transverse channel; the air duct temporary inverted arch is arranged in the middle of the cross channel, the frame beam is arranged in the outline of the interval normal line ingate range, and the single-hole double-line large section and the single-hole single-line standard section are arranged in the frame beam;

The frame beam is of a door-shaped structure, the standard section of the frame beam adopts 22a section steel of double-spelling tool, the large section adopts 25a section steel of tool, and C25 concrete is sprayed and mixed in time; the frame beam is connected with the side wall of the transverse channel;

The frame beam comprises a support column, a support beam and an oblique beam, and the bottom of the support column is connected with a bottom plate grid of the primary support of the cross road; the supporting beam is arranged at the bottom of the temporary inverted arch of the air duct, the supporting column penetrates through the temporary inverted arch of the air duct and the supporting beam, and the supporting column and the supporting beam form a rectangular structure; the oblique beam is arranged on the supporting column and used for supporting the bottom surface of the supporting beam.

Further, the section primary support is installed on the side wall of the transverse channel through a connecting component; the connecting component comprises an embedded steel bar piece and a connecting rib, the embedded steel bar piece is embedded in the side wall of the transverse channel and used for installing a section primary support, and the connecting rib is used for reinforcing connection between the embedded steel bar piece and the section primary support; the connecting members are adopted to connect the primary support of the section, so that the smooth conversion of a stress system is realized, and the subsequent construction safety can be effectively ensured.

Further, the mounting steps of the section primary support are as follows: pre-embedding a pre-embedded steel bar piece on the side wall of the transverse channel, and reserving a position in the pre-embedded steel bar piece for placing double-spliced I-shaped steel in the later period; then after the section primary support is welded firmly, welding a connecting rib below the connection of the embedded steel bar piece and the section primary support at an angle of 60 degrees with the horizontal plane, and respectively welding two ends of the connecting rib on the embedded steel bar piece and the section primary support; and then welding a reinforcing mesh sheet in a triangular frame formed by the connecting ribs, the embedded reinforcing steel bar pieces and the section primary support through expansion bolts, and spraying concrete to the triangular frame area.

furthermore, the frame beam at the single-hole single-line standard section adopts double-spliced 22a section steel, and the frame beam at the single-hole double-line large section adopts 25a section steel and is subjected to C25 concrete spraying and mixing in time; the connection between the door-shaped frame beam and the side wall of the transverse channel and the temporary inverted arch is ensured to be firm, and the construction safety is ensured.

Furthermore, deformation joints are arranged at the positions of the single-hole double-line large section and the single-hole single-line standard section; the large cross section with single hole and double lines and the standard cross section with single hole and single line can be ensured to have enough deformation width in the deformation joint without causing the damage of buildings.

Furthermore, a lifting hook is pre-embedded on the temporary inverted arch of the air duct, and the lifting hook can be used for installing a hanging beam; the follow-up construction is more convenient, wherein specifically for pre-buried 1t lifting hook, pre-buried 5t hanging beam.

Furthermore, the bottoms of the support columns are connected with the bottom plate grids of the transverse channels in an electric welding mode; the connection needs to be firm, and the welding requirements of the profile steel are met.

Further, after the frame beam is erected, adopting cement mortar to fill and compact gaps between the frame beam and the side walls of the construction transverse channel; the gap is tightly filled with cement mortar, so that the structural safety can be effectively ensured.

compared with the prior art, the invention has the beneficial effects that:

1. The 'door' frame beam is additionally arranged on the outer contour of the ingate range, so that a stress system at the ingate position of the interval positive line can be smoothly converted, the load is transferred to the frame beam, and the construction safety is effectively ensured.

2. The accurate section department of "door" type frame roof beam that adds adopts two worker 22a shaped steels of piecing together, and big section department adopts workman 25a shaped steel to in time carry out C25 concrete and spout and mix, guarantee door type frame roof beam and cross access lateral wall and interim invert firm in connection, ensure construction safety, the construction of alright carrying out the horse head door after the installation, consequently can be indirect reduction during whole construction. Meanwhile, the gap between the door-shaped frame beam and the side wall of the construction transverse channel is filled compactly by adopting cement mortar, so that the stability of the whole structure can be ensured, and the safety is further improved.

3. the I-shaped steel and the steel plate are connected in a welding mode, connection needs to be firm, the welding requirements of the section steel are met, and the stability of the structure is effectively guaranteed.

Drawings

FIG. 1 is a longitudinal section of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is a schematic structural view of the frame rail of the present invention;

FIG. 4 is a schematic view of the connection of the cross-sectional preliminary bracing and the connecting member of the present invention;

The device comprises a 1-section primary support, a 2-cross-track primary support, a 3-air-channel temporary inverted arch, a 31-lifting hook, a 4-frame beam, a 41-supporting column, a 42-supporting beam, a 43-inclined beam, a 51-steel bar piece, a 52-connecting rib, a 6-single-hole double-line large section and a 7-single-hole single-line standard section.

Detailed Description