CN210068153U - Station access & exit open cut section construction structure who closes on city building and road - Google Patents

Abstract

The utility model provides a close on station access & exit open cut section construction structures of city building and road. The open-cut section construction structure comprises a first open-cut shaft close to the underground excavation area and a second open-cut shaft covering other open-cut areas, wherein a grouting reinforcement area is arranged on one side or two sides of the periphery of the first open-cut shaft, the grouting reinforcement area is a reinforcement area formed by deep drilling and grouting on the ground before the first open-cut shaft is constructed, and the depth of the grouting reinforcement area is not less than that of the first open-cut shaft; and the well mouths of the first open cut shaft and the second open cut shaft are both provided with a locking collar beam, and the first open cut shaft and the second open cut shaft are both constructed by adopting an inverted well wall method. The utility model solves the problems that the open excavation section of the traditional station access opening occupies a large area and is easy to cause serious traffic jam, and reduces the early-stage dismantling and modifying cost; the problems of difficult arrangement of construction equipment, difficult construction and the like caused by insufficient field are solved; reducing the disturbance to surrounding buildings and soil layers.

Description

Station access & exit open cut section construction structure who closes on city building and road

Technical Field

The utility model relates to a subway construction technical field particularly, relates to a station access & exit open cut section construction structures who closes on city building and road.

Background

Along with the development of urban rail transit construction in China, more and more cities begin to develop subway construction, a plurality of subway station entrances and exits are generally arranged in busy downtown areas and traffic key roads of cities, commercial buildings and residential buildings around construction areas are dense, traffic flow is high, some entrances and exits are close to commercial residential buildings, municipal bridges and main roads, and construction areas are limited due to surrounding buildings.

The foundation pit enclosing structure of the traditional construction method for the open excavation section of the station entrance adopts the cast-in-place pile and the steel pipe inner support, the construction area occupied by the cast-in-place pile and the steel pipe inner support is large, large mechanical equipment such as a pile driver and a crane is difficult to place, a large construction site is needed for processing a steel reinforcement cage, if the site is narrow and small, construction cannot be carried out, a house needs to be removed, a municipal road needs to be occupied, communication and modification are needed, traffic jam is easy to cause, in the construction process of the cast-in-place pile, the position of an underground pipeline needs to be detected firstly, a great safety risk does not exist in detection, the position needs to be modified or the position of the drilling needs to be modified when the pipeline is encountered, the early-stage removal cost of the whole construction is large, particularly. If the open cut construction area is close to a house building, the construction risk is higher, and a house reinforcing and protecting measure is needed, so that the construction difficulty is increased, the construction period is prolonged, a plurality of unforeseeable risks exist, and the construction faces a series of problems.

Disclosure of Invention

The utility model discloses according to the problem that prior art exists, a station access & exit open cut section construction structures who closes on city building and road is provided, and the shaft of this construction structures adopts the construction of the wall of a well method of hanging upside down, and construction area is little, can avoid occuping the town road, causes the problem of traffic jam to can reduce the construction degree of difficulty, reduce the influence to peripheral building.

In order to solve the problem, the utility model provides a close on station access & exit open cut section construction structures of city building and road: the open-cut section construction structure comprises a first open-cut shaft close to the underground excavation area and a second open-cut shaft covering other open-cut areas, wherein a grouting reinforcement area is arranged on one side or two sides of the periphery of the first open-cut shaft, the grouting reinforcement area is a reinforcement area formed by deep drilling and grouting on the ground before the first open-cut shaft is constructed, and the depth of the grouting reinforcement area is not less than that of the first open-cut shaft; the shaft heads of the first open-cut shaft and the second open-cut shaft are both provided with a locking collar beam, the first open-cut shaft and the second open-cut shaft are both constructed by adopting an inverted well wall method, the construction depth of the first open-cut shaft is equal to or greater than the bottom surface depth of the underground-cut connecting section, the bottom surface of the first open-cut shaft is provided with a backfill area, and the top surface of the backfill area is upwards inclined from one end close to the underground-cut connecting section to the end of the second open-cut shaft; the second open cut shaft is supported through multichannel shaped steel and is separated into a plurality of construction districts, and a plurality of construction districts dig simultaneously and establish the branch of forming a plurality of bottoms of a well and being the inclined plane towards a lopsidedness and dig the shaft, and a plurality of slope bottom surfaces of dividing the shaft and the slope top surface of first open cut shaft bottom backfill district are on same straight line.

The utility model discloses better technical scheme: when the first open cut vertical shaft is constructed to the vault position of the underground cut connecting section, temporarily sealing the bottom, applying a forepoling and excavating a pilot tunnel of the underground cut connecting section, and then continuing to construct to the bottom of the shaft; and the second open cut vertical shaft is constructed after the first open cut vertical shaft is constructed.

The utility model discloses better technical scheme: the inclined top surface of the backfill area of the bottom surface of the first open-cut shaft and the inclined bottom surfaces of the multiple sub-cut shafts of the second open-cut shaft are inclined surfaces with an inclination angle of 25-35 degrees.

The utility model discloses better technical scheme: and the bottoms of the locking collar beams of the first open-cut vertical shaft and the second open-cut vertical shaft are provided with mortar cushion layers with the thickness of 4-6 cm, the side wall of the lower part adopts a net-sprayed concrete protective wall, the inner side and the outer side adopt wood rubber plates with the thickness of 12mm as an integral wood mold for panel processing, and concrete is poured.

The utility model discloses better technical scheme: and protective fences are arranged at the well mouths of the first open-cut shaft and the second open-cut shaft, are made of steel pipes and are fixed above the locking collar beams.

The utility model discloses better technical scheme: the width of the grouting reinforcement area is 2-3 m.

The utility model comprises a first shaft close to the underground excavation channel and a second shaft of other open excavation areas, wherein the two shafts are constructed by adopting a method of hanging the shaft wall upside down, and the second shaft is divided into a plurality of areas by I-steel supports, and the plurality of areas are constructed simultaneously, so that the construction time is saved; the utility model solves the problems that the open excavation section of the traditional station access opening occupies a large area, occupies a municipal road and is easy to cause serious traffic jam, and reduces the early-stage dismantling and modifying cost; the problems of difficult arrangement of construction equipment, difficult construction and the like caused by insufficient field are solved; the disturbance to surrounding buildings and soil layers is reduced, and the safety of the surrounding buildings and underground pipelines is ensured.

Drawings

Fig. 1 is a schematic plan view of the present invention;

fig. 2 is a longitudinal sectional view of the present invention;

fig. 3 is a plane grid steel frame diagram of the present invention.

In the figure: the method comprises the following steps of 1-a first open-cut shaft, 2-a second open-cut shaft, 2-1-a separately-cut shaft, 3-a grouting reinforcement area, 4-a locking collar beam, 5-a section steel support, 6-a subsurface excavation connecting section, 7-a backfill area and 8-a protective fence.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings. Fig. 1 and fig. 2 are drawings of the embodiment, which are drawn in a simplified manner and are only used for clearly and concisely illustrating the embodiments of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in the attached drawings 1 and 2, the utility model provides a station access & exit open cut section construction structure near city building and road, including the first open cut shaft 1 near the undercut area and the second open cut shaft 2 that covers other open cut areas, be equipped with slip casting reinforcing area 3 in one side or both sides of the first open cut shaft 1 periphery, slip casting reinforcing area 3 is the reinforcing area that forms through ground deep drilling slip casting before the construction of first open cut shaft 1, and its width is 2 ~ 3m, and the degree of depth is not less than the degree of depth of first open cut shaft 1; the well heads of the first open cut shaft 1 and the second open cut shaft 2 are both provided with a locking collar beam 4, a protective fence 8 is arranged above the locking collar beam 4, and the protective fence 8 is made of steel pipes. The first open-cut shaft 1 and the second open-cut shaft 2 are both constructed by adopting an inverted well wall method, the construction depth of the first open-cut shaft 1 is equal to or greater than the bottom surface depth of the underground excavation connecting section 6, a backfill region 7 is arranged at the bottom surface of the first open-cut shaft 1, and the top surface of the backfill region 7 is upwards inclined from one end close to the underground excavation connecting section 6 to the end of the second open-cut shaft 2; the second open cut shaft 2 is divided into a plurality of construction areas through a plurality of section steel supports 5, the plurality of construction areas are dug simultaneously to form a plurality of shaft bottoms to incline towards one side to form a sub-cut shaft 2-1 with an inclined surface, and the inclined bottom surfaces of the sub-cut shafts 2-1 and the inclined top surface of a backfill area 7 at the bottom of the first open cut shaft 1 are on the same straight line. The inclined top surface of the bottom surface backfill region 7 of the first open cut shaft 1 and the inclined bottom surfaces of the sub-cut shafts 2-1 of the second open cut shaft 2 are inclined surfaces with an inclination angle of 25-35 degrees.

The utility model discloses a construction structure specifically is under construction again, and first open cut shaft 1 is under construction when the vault position of undercut linkage segment 6, the temporary back cover to carry out and done and continue to be under construction to the shaft bottom after the leading tunnel of leading pipe canopy excavation linkage segment 6 simultaneously, then construction drainage well, after the water pump drainage in with the shaft well, backfill again and be the inclined plane, and second open cut shaft 2 is under construction after first open cut shaft 1 construction is accomplished.

It is right to combine specific embodiment below the utility model provides a construction structure's specific work progress further explains, and the embodiment specifically is the subway station construction project in a certain place, and this construction project is two-layer island formula station in the underground, and double-column three-span concrete structure, construction method adopt the middle undercut of both ends open cut. The south side of the A gateway of the station is a second-floor distribution building of a multi-customer building, the height of the distribution building is 11.03m, the business unit of the distribution building is an internet bar, and the main building of the multi-customer building is of a 5-floor brick-concrete structure and is positioned in the northwest corner of the intersection of the south aster road and the red gate road. A passageway A is worn down thousand guest buildings seafood hotel and is joined in marriage the building, joins in marriage the building and is located the north side of main building, joins in marriage the building and is 2 layers of frame construction, does not have the basement, secretly digs the passageway and is 5.9m apart from the bottom plate. The west side is a six-storey residential building with a brick-concrete structure and a strip foundation, the height is 16.8m, and the horizontal distance between the west side and the A gateway is 3.6 m. The north side is a second floor, a brick-concrete structure, a strip foundation and no basement, the height is 11m, and the distance between the north side and the open excavation section of the A passageway is 5.7 m. A rainwater pipe line with the diameter of 1400mm exists around the east side of 8+ m, the pipe bottom of the D1400 rainwater pipe is buried deeply by 3.13m, the minimum horizontal distance between the rainwater pipe and the open excavation section of the A passageway is 7.92m, and the minimum horizontal distance between the rainwater pipe and the underground excavation section is 8.4 m. The open excavation section and the underground excavation building penetrating section of the A access are located in a place after removal of the west side of the south aster road, construction does not need to occupy a road in the prior art, the influence on the south aster road is small, one side, close to an underground excavation area, of the open excavation section of the A access is close to a multi-storey building for distribution, 2 layers of door-face rooms of the multi-storey building are of a brick-concrete structure, a strip foundation (the foundation burial depth is 2m, the horizontal distance between the strip foundation and the open excavation foundation pit is 5.1m, 6 layers of residential buildings are of a brick-concrete structure, the strip foundation, the foundation burial depth is 3m, no basement is provided, the horizontal distance between the strip foundation and the open excavation foundation pit is 3.6m, two layers of distribution buildings are penetrated downwards. If the foundation pit is excavated after being surrounded according to the normal open excavation mode, the construction of the surrounding structure is limited, the normal construction cannot be realized, and the surrounding can cause great disturbance to surrounding buildings.

In order to guarantee the normal construction of station open cut section, can not lead to the fact the influence to current building on every side, the inventor adopts the construction structure in this application, the foundation ditch adopts the construction of inverse hanging wall of a well method, the biggest excavation depth of foundation ditch is 14.7m, the excavation width is 7.1m and 8.1m, wall of a well is just propped up thick 300mm, roof side wall thickness is 0.5m, bottom plate thickness 0.6m (U type groove section bottom plate is thick 0.4m), its concrete work progress as follows:

(1) before the construction of the vertical shaft, isolation measures are added on the residential building side, and soil layers are grouted downwards from the ground on the thousand-visitor building side and the six-storey residential building side of the first open-cut vertical shaft 1 respectively to reinforce the soil layers, wherein the grouting width is 2m, and the grouting depth is 15m, so that the deformation of the building foundation caused by the vertical shaft excavation is reduced.

(2) Adopting the accurate laying-out of total powerstation, deciding the excavation outline line of the fore shaft 1 fore shaft collar tie beam, starting to construct the fore shaft collar tie beam 4 of the fore shaft 1, the concrete work progress of the fore shaft collar tie beam 4 is: the manual work is carried out the "X" font and is dug and visited, after the supervision inspection is qualified, adopts manual work cooperation excavator to excavate, and the excavation earthwork is dug by the excavator and is stacked in interim mound field, and the manual work is maintained the wall of a well simultaneously to guarantee that shaft section size accords with the design requirement, the lateral wall of this scope adopts 5cm thick C25 concrete net to spout. In the excavation process, over excavation is strictly forbidden, and when the over excavation occurs, the concrete with the same level is used for spraying; adopting a mortar cushion layer with the thickness of 5cm at the bottom of the fore shaft ring beam, adopting a net-sprayed concrete protective wall on the side wall, adopting wood rubber plates with the thickness of 12mm as integral wood moulds for panel processing on the inner side and the outer side, after finishing the binding of reinforcing steel bars and embedding vertical connecting ribs of grids, erecting a template support frame, pouring concrete after passing supervision and inspection, adopting C30 commercial concrete as the concrete, transporting the concrete to the site by a tank car, pumping the concrete into the moulds, symmetrically pouring in layers, vibrating by an inserted vibrator, and curing according to a winter application scheme after final setting; and the water retaining wall of the locking collar beam is 50cm higher than the ground and is poured together with the walling crib concrete.

(3) After the construction of the fore shaft collar beam of the first open cut shaft 1 is completed, installing guard rails, arranging two 120 cm-high guard rails at the well mouth of the shaft, wherein the guard rails are made of steel pipes with the outer diameter of 48mm and the wall thickness of 3mm, and are not seriously rusted, bent, flattened or cracked, and brushing red and white paint alternately; the integral structure of the railing and the fixing of the railing posts are firm and reliable, the distance between the railing posts is 100cm, the distance between the horizontal cross ribs is 60cm, and the full hanging hole diameter is not larger than 5cm of a steel wire mesh.

(4) After the strength of the concrete of the locking collar beam of the first open cut shaft 1 reaches the design requirement, starting the primary support construction of the shaft, and performing the earthwork excavation progress in cooperation with the temporary section steel support; the shaft body of the vertical shaft is reversely excavated by adopting manual excavation, excavation is carried out from top to bottom while supporting, diagonal excavation is adopted in the excavation sequence, muck is manually poured into the middle of the vertical shaft and lifted to a ground muck field through automobile lifting, and the footage of the vertical shaft excavation is 0.5m per cycle. And constructing the first open cut vertical shaft 1 to the vault position of the underground cut section by an inverted well wall method, temporarily sealing the bottom, constructing an advanced pipe shed, constructing the underground cut connecting section 6, and continuously excavating the vertical shaft to the designed depth after the construction of the underground cut connecting section 6 is finished.

(5) After the earth excavation of the well wall of the first open cut shaft 1 is finished, checking clearance according to the measuring cross line, and erecting a steel grating after the clearance is qualified; when the steel grating is erected, the steel grating must be erected strictly according to the measured elevation and the central line control line, the horizontal adjustment and the central line adjustment are firstly carried out on the erection of the grating, then the horizontal and the central lines are checked, and the adjustment is repeatedly carried out until the central line and the horizontal meet the quality requirement. The adjacent steel gratings are symmetrically arranged, and the node plates are mutually staggered; the steel grating should be level, and the circulation footage needs the accuracy, and connecting bolt screws up neatly, if connecting plate department bolt can't connect when, all add between relative main muscle and weld a with main muscle uniform diameter reinforcing bar, adopts single face welding, overlap joint length 10 d. And after the steel grating is erected, welding connecting ribs and a hanging net, wherein the connecting ribs are phi 22 thread reinforcing steel bars, the inner layer and the outer layer are arranged in a quincunx shape, the circumferential distance is 1m, and the welding length is 10d (22 cm). Reinforcing mesh adopted

The mesh sheets are arranged in a double-layer mode, and the reinforcing steel bar mesh sheets are lapped into a grid. The vertical connecting rib intervals of the vertical shafts at two sides of the range of the horse head of the transverse passage are encrypted to 250 mm. After the steel grating is qualified by inspectionSpraying concrete to seal the tunnel face in time, and spraying C25 concrete with the thickness of 350mm in a net mode; after the concrete is finished, timely finishing is needed, and the surface is smooth and straight and has internal and external light; the protective layer of the main ribs is 32 mm.

(6) And (3) sealing the bottom of the first open cut shaft 1 by adopting I20a I-shaped steel, connecting ribs, reinforcing mesh and concrete spraying (C25). After the vertical shaft is excavated to the designed elevation, a concrete cushion layer with the thickness of 5cm is sprayed, I-shaped steel is erected, the upper side and the lower side of the I-shaped steel are welded by phi 22 connecting bars at the interval of 750mm, and a reinforcing mesh is adopted

Arranging the outer side in a single layer, spraying concrete after acceptance inspection is qualified, and sealing the bottom;

(7) after the bottom sealing of the first open cut shaft 1 is finished, the backfill region 7 at the bottom of the first open cut shaft 1 is backfilled to the bottom of the secondary lining structure by C15 concrete, and secondary lining construction is carried out on the first open cut shaft 1 when the strength meets the requirement.

(8) After the second lining construction of the first open cut shaft 1 is finished, firstly constructing a locking collar beam of the second open cut shaft 1 according to the method in the step 2, then downwards excavating the second open cut shaft 2 by adopting an inverted hanging shaft wall method, after the earth excavation is finished, checking clearance according to a measuring cross line, after the clearance checking is qualified, erecting a steel grating on the shaft wall, dividing the second open cut shaft 2 into a plurality of sub-cut shafts 2-1 through a profile steel support 5, welding connecting ribs and hanging nets after the steel grating erection is finished, wherein the connecting ribs adopt phi 22 thread steel bars, arranging an inner layer and an outer layer of quincunx shapes, the circumferential distance is 1m, and the welding length is 10d (22cm), and the steel bar nets adopt phi 22 thread steel barsThe mesh sheets are arranged in a double-layer mode, and the steel bar mesh sheets are lapped one grid; the steel grating is inspected to be qualified and then sprayed with concrete in time to seal the tunnel face, and the thickness of the net sprayed C25 concrete is 350 mm; after the concrete is finished, the concrete must be trimmed in time, and the surface should be smooth and straight and have internal and external light.

(9) And (3) repeating the step (8) until the plurality of sub-excavation shafts 2-1 of the second open excavation shaft 2 are excavated to the designed depth, stopping the excavation of the sub-excavation shafts 2-1 respectively, finishing the secondary lining construction of the rest slope section bottom plates of the plurality of sub-excavation shafts 2-1 at one time, pouring concrete in the plurality of sub-excavation shafts 2-1 in a segmented manner from bottom to top, removing the next section and the section of section steel after each section of concrete reaches the designed strength, removing each open excavation section steel from bottom to top, pouring concrete when the vertical removal height is not more than 2m each time, and continuously removing the concrete upwards after the concrete reaches 70% of the designed strength.

The utility model discloses at the 1 excavation in-process of first open cut shaft, when it excavates to corresponding water level elevation 1.5m, dig the exploratory pit with the luoyang shovel to the rainfall condition is surveyed. And corresponding construction measures are made according to the ascertained condition, if no water exists, the construction is normal, if water exists, the construction can be carried out normally, if water exists, the reason can be analyzed by precipitation personnel, measures such as adding precipitation wells around the vertical shaft are taken, the construction of the vertical shaft under the water-free condition is ensured, and if sand gushing, water gushing, tunnel face collapse and construction monitoring data abnormality exist in the construction of the vertical shaft, the tunnel face is immediately sealed and the construction is stopped. After the engineering part sets corresponding measures according to the field situation, the construction can be recovered after receiving the notification. The plug wall structure at the upper part of the sump is provided with more roof trusses towards the floor penetrating section, a construction space is reserved for mounting the primary support grids of the sump, and the grid mounting quality is ensured. The shaft is excavated in a full section under normal conditions, and soil on the tunnel face is prevented from being disturbed during excavation so as to avoid collapse. Under the conditions of poor geological conditions or little water leakage, diagonal excavation is adopted, and a circle of rear frame grating is excavated to spray concrete.

The above description is only an embodiment of the present invention, and the above-mentioned embodiment only expresses the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (6)

1. The utility model provides a station access & exit open cut section construction structures who closes on city building and road which characterized in that: the open-cut section construction structure comprises a first open-cut shaft (1) close to an underground cutting area and a second open-cut shaft (2) covering the open-cut area, wherein a grouting reinforcement area (3) is arranged on one side or two sides of the periphery of the first open-cut shaft (1), the grouting reinforcement area (3) is a reinforcement area formed by deep drilling and grouting on the ground before the first open-cut shaft (1) is constructed, and the depth of the grouting reinforcement area (3) is not less than that of the first open-cut shaft (1); the shaft mouth of each of the first open-cut shaft (1) and the second open-cut shaft (2) is provided with a locking collar beam (4), the first open-cut shaft (1) and the second open-cut shaft (2) are constructed by adopting an inverted well wall method, the construction depth of the first open-cut shaft (1) is equal to or greater than the bottom surface depth of the underground excavation connecting section (6), the bottom surface of the first open-cut shaft (1) is provided with a backfill area (7), and the top surface of the backfill area (7) is upwards inclined from one end close to the underground excavation connecting section (6) to the end of the second open-cut shaft (2); the second open cut shaft (2) is separated into a plurality of construction areas through multichannel shaped steel support (5), and a plurality of construction areas dig simultaneously and establish branch excavation shaft (2-1) that form a plurality of bottoms towards the incline and be the inclined plane, and the slope bottom surface of a plurality of branch excavation shaft (2-1) and the slope top surface of first open cut shaft (1) bottom backfill region (7) are on same straight line.

2. The structure of claim 1, wherein the structure comprises: when the first open cut shaft (1) is constructed to the vault position of the underground cut connecting section (6), temporarily sealing the bottom, applying a leading pipe shed and excavating a pilot tunnel of the underground cut connecting section (6), and then continuing to construct to the bottom of the shaft; the second open cut shaft (2) is constructed after the first open cut shaft (1) is constructed.

3. The structure of claim 1, wherein the structure comprises: the inclined top surface of the bottom surface backfill region (7) of the first open-cut shaft (1) and the inclined bottom surfaces of the plurality of sub-cut shafts (2-1) of the second open-cut shaft (2) are inclined surfaces with the inclination angle of 25-35 degrees.

4. The structure of claim 1, wherein the structure comprises: and the bottoms of the locking collar beams (4) of the first open-cut vertical shaft (1) and the second open-cut vertical shaft (2) are provided with mortar cushion layers with the thickness of 4-6 cm, the side wall of the lower part adopts a net-sprayed concrete protective wall, the inner side and the outer side adopt wood rubber plates with the thickness of 12mm as an integral wood mold for panel processing, and concrete is poured.

5. The structure of claim 1, wherein the structure comprises: the well heads of the first open-cut shaft (1) and the second open-cut shaft (2) are respectively provided with a protective fence (8), and the protective fence (8) is made of steel pipes and fixed above the locking collar beam (4).

6. The structure of claim 1, wherein the structure comprises: the width of the grouting reinforcement area (3) is 2-3 m.

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