CN211287710U - Construction rack for excavation supporting structure of large-section tunnel - Google Patents
Construction rack for excavation supporting structure of large-section tunnel Download PDFInfo
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- CN211287710U CN211287710U CN201921893217.4U CN201921893217U CN211287710U CN 211287710 U CN211287710 U CN 211287710U CN 201921893217 U CN201921893217 U CN 201921893217U CN 211287710 U CN211287710 U CN 211287710U
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Abstract
The utility model discloses a construction rack for large cross section tunnel excavation supporting construction, including work platform, the work platform top is provided with the operation rack, the periphery of operation rack is provided with the protection platform, the protection network is installed to protection platform periphery, the protection network with the guardrail platform ligature is fixed, one side and the face country rock of operation rack meet, and be in be provided with twice cat ladder on the operation rack. The utility model discloses following beneficial effect has: the construction speed is high, a large amount of labor is saved, and the production cost is reduced; the construction arrangement is more reasonable, the construction progress is accelerated, the construction period and unnecessary labor cost are saved, and the task can be smoothly completed within a shorter construction period.
Description
Technical Field
The utility model relates to a construction technical field, in particular to a construction rack for large cross section tunnel excavation supporting construction.
Background
The total length of a Guizhou road station-Western town station interval (hereinafter referred to as a Guizhou interval) is about 546.9 m. The Guizhou road station is positioned on the southwest side of the intersection of the Guizhou road and the Tuo island road, the road is laid along the five paths in the Taixi direction to the north after going out of the Guizhou road station, and the West town station is accessed at the intersection of the Fisher-county road and the \37075;, the North city road after passing through a large number of buildings. And double parking lines are arranged in front of the west station according to operation requirements to form a four-line large-section tunnel.
According to geological characteristics, four-line large sections in the Guixi region are 4 types of sections: ZA, ZB, ZC, ZD cross section. The sections ZA and ZB are of composite lining structure, and the sections ZC and ZD are of one-way lining structure. ZA section is IV 2 level surrounding rock, and is built by adopting a composite lining; the ZB section is IV grade 1 surrounding rock, the excavation section is wide, and composite lining is adopted; the ZC section is II-grade surrounding rock and is built by adopting a single-layer lining; ZD section is II level surrounding rock, adopts the individual layer lining.
This application is directed against above-mentioned big section tunnel, provides a construction rack for big section tunnel excavation supporting construction to the big section tunnel excavation to same geology provides experience.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a construction rack for big section tunnel excavation supporting construction is provided, it has overcome prior art's defect.
The utility model discloses the technical problem that solve is realized through following technical scheme:
the utility model provides a construction rack for large cross section tunnel excavation supporting construction, includes work platform, the work platform top is provided with the operation rack, the periphery of operation rack is provided with the protection platform, the protection network is installed to protection platform periphery, the protection network with the guardrail platform ligature is fixed, one side and the face country rock of operation rack meet, just be provided with twice cat ladder on the operation rack.
Preferably, in the above technical solution, the operating platform is formed by welding an upright column, a longitudinal beam, and a side wing, the upright column and the longitudinal beam are made of 18 h-steel, and the side wing is made of a Φ 89 steel pipe and a Φ 76 telescopic steel pipe.
Preferably, in the above technical scheme, the working platform is used for the upper step expanding excavation construction, and is formed by raising and leveling earth excavated by the adjacent line tunnels by using a loader and an excavator.
Preferably, in the above technical solution, the two crawling ladders are respectively arranged on two sides of the operation rack.
The above technical scheme of the utility model, following beneficial effect has:
(1) the construction speed is fast, saves a large amount of manpower, reduction in production cost.
(2) The construction arrangement is more reasonable, the construction progress is accelerated, the construction period and unnecessary labor cost are saved, and the task can be smoothly completed within a shorter construction period.
Drawings
Fig. 1 is the utility model discloses a schematic diagram of a construction rack for large cross section tunnel excavation supporting construction.
Fig. 2 is another schematic diagram of the utility model discloses a construction rack for large cross section tunnel excavation supporting construction.
Detailed Description
The following detailed description of the present invention is provided to facilitate further understanding of the invention. It is not intended to limit the invention.
The utility model provides a construction rack for large cross section tunnel excavation supporting construction, includes work platform, 1 top of work platform is provided with operation rack 2, the periphery of operation rack 2 is provided with the protection platform, the protection network is installed to protection platform periphery, the protection network with the guardrail platform ligature is fixed, one side and the face country rock of operation rack 2 meet, just be provided with twice cat ladder on the operation rack.
Further, the operation bench 2 is formed by welding an upright column, a longitudinal beam and a side wing, wherein the upright column and the longitudinal beam are made of 18I-shaped steel, and the side wing is made of a phi 89 steel pipe and a phi 76 telescopic steel pipe.
Furthermore, the working platform is used for the upper step expanding excavation construction and is formed by heightening and leveling earth excavated by the adjacent line tunnels by using a loader and an excavator.
Further, the two crawling ladders are respectively arranged on two sides of the operation rack.
The construction method for excavating the large-section tunnel by using the construction rack of the large-section tunnel excavation supporting structure comprises the following steps:
scheme for excavating tissue
According to comprehensive consideration of four-line large-section geological conditions, ground environment, tunnel section structural form, supporting mode, slag discharge capacity of hoisting equipment of Guizhou road stations and Western town stations and the like in the Guixi district, excavation from two ends to the middle is planned, and a working surface I is as follows: excavating from the Guizhou road station to the west station, wherein the working surface II is as follows: and excavating from the west station to the Guizhou station. This scheme process conversion is few, and the process is followed up soon, and the follow-up construction of the organization of being convenient for, excavation section change is less, and the volume of slagging tap is comparatively even, and the time limit for a project is controllable basically.
And the ZA and ZB sections are IV-grade surrounding rock composite lining sections, and are excavated by adopting a CD method, the ZC and ZD sections are II-grade surrounding rock single-layer lining sections, and the left and right pilot tunnel step method excavation and the step method excavation are adopted.
(1) Guizhou road station working surface I: gradually raising the left line and the right line of the end of the standard hole in the TBM interval to a large section top, wherein the distance between the designed grids is 0.5m, the raising is 0.25m each time, the raising angle is 27 degrees, the outward expansion angle of the side wall in the horizontal direction is 25 degrees, the outward expansion angle of the middle partition wall is 13 degrees, the raising is 12m until the top is required, and the temporary support of the raising section is the same as the permanent support structure form, as shown in the following figure.
(2) And constructing a right line, continuing to excavate forwards after the right line is lifted to the top, excavating a left line after the left line has excavation conditions, and excavating a left line and a right line with the left line and the right line, wherein the staggered distance of the tunnel faces is not less than 15m, as shown in the following figure.
(3) And (3) normally blasting the left line and the right line, normally constructing the left line and the right line forwards after the left line is raised to the vault, blasting by reversely excavating in intermittent time, and taking up no whole construction period, wherein a working condition diagram is as follows.
(4) Gradually raising the left and right lines of the end of the standard hole in the TBM interval to a large section top, wherein the grid interval is 0.5m, the raising is 0.25m each time, the raising angle is 27 degrees, the outward expansion angle of the side wall in the horizontal direction is 25 degrees, the outward expansion angle of the middle partition wall is 13 degrees, the raising is 12m until the top is required, and the temporary support of the raising section is the same as the permanent support structure form, as shown in the following figure.
(5) Gradually raising the left line and the right line of the end of the standard tunnel in the TBM interval to a large section top, wherein the grid interval is 0.5m, the raising is 0.25m each time, the raising angle is 27 degrees, the outward expansion angle of the side wall in the horizontal direction is 25 degrees, the outward expansion angle of the middle partition wall is 13 degrees, the raising is carried out until the top needs 12m, and the temporary support of the raising section is the same as the permanent support structure form.
(6) Gradually raising the left line and the right line of the end of the standard tunnel in the TBM interval to a large section top, wherein the grid interval is 0.5m, the raising is 0.25m each time, the raising angle is 27 degrees, the outward expansion angle of the side wall in the horizontal direction is 25 degrees, the outward expansion angle of the middle partition wall is 13 degrees, the raising is carried out until the top needs 12m, and the temporary support of the raising section is the same as the permanent support structure form.
The ZA and ZB composite lining section excavation steps are as follows:
(1) excavating an upper step of the pilot tunnel: two rows of small guide pipes are arranged along the arch part of the underground excavation section, t is 3.5mm, L is 4.0m, and the annular distance is @400 mm; firstly, excavating a pilot tunnel, excavating 1 truss grid pitch at the footage, temporarily accumulating excavated earth and stone in a tunnel excavated by a lower pilot tunnel TBM to serve as an operation platform, erecting a steel grid and a temporary middle partition wall, and drilling an anchor rod and a net-jet support;
(2) excavating a lower step of the pilot tunnel: circularly advancing to 1 grid pitch every time of excavation; erecting a grid and a temporary support in time after the excavation is finished, and driving an anchor rod and a net-jet support;
(3) excavating an upper step of the backward pilot tunnel: excavating the upper step of the first pilot tunnel into the tunnel and excavating the rear pilot tunnel under the condition of excavating the rear pilot tunnel; the excavated earth and stone are temporarily accumulated in a tunnel tunneled by a lower pilot tunnel TBM (tunnel boring machine) to serve as an operation platform, and a grating is erected, an anchor rod is arranged, and a net-jet support is arranged in time;
(4) excavating a lower step of the backward pilot tunnel: circularly advancing to 2 truss grid intervals each time of excavation; after the excavation is finished, a grating is erected in time, an anchor rod is arranged, and a net-jet support is arranged.
ZC and ZD single-layer lining section excavation steps are as follows:
(1) excavating an upper step of the pilot tunnel: excavating the steps on the right line in advance according to actual conditions on site; after the excavation is finished, spraying single-layer lining concrete support;
(2) excavating an upper step of the backward pilot tunnel: excavating in time after the left line meets the conditions; spraying single-layer lining concrete after excavation is finished;
(3) excavating a lower step rock pillar: excavating the lower step by a two-step method, circularly advancing for 3m, and vertically drilling the middle rock pillar by adopting an excavation-modification drill;
(4) excavating the rest part of the lower step: adopting an excavation-change drill to vertically drill holes on the rest part of the rock pillar of the lower step, and excavating to reach 3 m; and the side walls on the two sides are drilled manually by air guns, and the footage is circularly advanced by 3 m.
Scheme for distributing field inside and outside holes
(1) Arranged in the hole
A ventilation pipe is arranged on the inner arch top of a TBM standard tunnel, a pedestrian passageway is arranged on the left side, an air water pipe is arranged on the right side, and a tunnel inverted arch is filled with dregs with the height of 0.5m and the width of 3m and serves as a mucking passageway after being filled and leveled.
(2) Construction ventilation design standard
According to the regulations of roads, factories and mines in China and related labor sanitation standards, the air in the construction operation section in the tunnel must meet the following sanitation standards:
dust concentration: the regulations of "decision on preventing silicon dust hazard in factories and mining enterprises" issued by the State Council: 2mg of dust containing more than 10% free silica per m3 air; when the content of free silica is below 10%, the content of mineral and plant dust without harmful substances is 10 mg; the amount of the water-mixed dust containing 10% or less of free silica was 6 mg.
Carbon monoxide (CO) concentration: mine safety regulations and related construction specifications stipulate that the concentration of carbon monoxide (CO) in air should not exceed 0.0024% (24 ppm by volume) and should not exceed 30mg/m3 by weight, and the concentration should be reduced to below 30mg/m3 after constructors enter a hole for 30 min.
Temperature in the hole: the most suitable working temperature in the tunnel is 15-20 ℃, and the temperature of the tunneling working face is not more than 28 ℃.
Noise standard: the noise health standard of a newly built enterprise is specified by the noise health standard of industrial enterprises in China (1970): the working time is 8 hours, and the noise does not exceed 85 decibels; the noise reaches 88 decibels, the working time can only be within 4 hours, and the hearing can be protected. And (3) related construction specification regulation: the noise is not more than 90 decibels.
(3) Off-site arrangement
In order to ensure construction quality, safety and construction period, reduce cost and make civilized construction good, the field plane is reasonably arranged according to the environmental conditions and the characteristics of projects where the project is located. Facilities and equipment are arranged on the construction site according to the specific arrangement of the construction site, and the site arrangement is reasonably adjusted along with the progress of construction.
The construction areas are divided according to the construction range, immovable and immovable facilities are considered firstly, and the sufficient operation surfaces of all machines and tools are ensured in construction, so that mutual interference is avoided. 1 25T lifting derrick is installed at the light and dark excavation boundary of the Guizhou road station and is responsible for slag discharging, feeding, hoisting and constructing of a small-mileage operation surface, and the derrick is totally closed so as to avoid construction noise disturbing residents; the slag storage field is arranged above the vault of the underground excavation section and is sealed by a 3m high steel plate, the plane area of the slag field is 130 square meters, and the slag storage capacity is about 260m3(ii) a The air compressor is arranged above a top plate of the open cut section, the transformer is arranged on the north side of the derrick, and facilities such as a residual gravel bin, a cement warehouse, a mixing station and the like, namely Guizhou road station, are constructed and finished during excavation.
Third, ballast discharging scheme
1. Transportation scheme
At present, the TBM of the left and right lines is tunneling and deslagging, the right line is expected to reach a track panel well after tunneling in 3 months and 15 days, the left line reaches the track panel well after tunneling in 4 months and 20 days, the right line is temporarily excavated in advance, and the left line is constructed after meeting conditions. Therefore, the right line is firstly subjected to half-section lifting and expanding excavation construction towards the west station direction, and a 4m rock pillar is reserved on the left side to ensure the transportation safety of the TBM battery car on the left line.
(1) Each face surface in the hole is provided with one 60-piece excavator for dumping and loading the dregs, the transport vehicle adopts a dump truck, the dreg transport distance and time are considered, each face surface is provided with two dump trucks for transporting the dregs, and four trucks are arranged at the dreg peak stage of each lifting device for transporting the dregs, so that the lifting requirements are met.
(2) The transportation route of the dregs in the hole is shown in the following figure. And the left line slag soil of the Guizhou road station is transported to the right line through the in-station channel, and the slag soil of the west town station is lifted to the ground through the No. 1 air shaft after being poured into the slag hopper.
Fourth, construction rack scheme
1. Bench work
When the right-side transverse channel is excavated, the expanded excavated earth and stone is transported to the position of a right-side bridle gate of a west town station, and a loader and an excavator are adopted to raise and level a working platform, so that the construction of expanding excavation on the upper step is facilitated. The height of the cushion slag is 3 m. And (5) expanding and digging the upper half section at the ingate to the top in 2 times, and erecting a grid spray anchor support. And the operation platform is continuously lifted by utilizing the earthwork dug by the first expansion, so that the 2 nd expansion and excavation construction is facilitated. The upright column and the longitudinal beam of the operation rack are made of 18I-shaped steel, the side wing is made of a phi 89 steel pipe and a phi 76 telescopic steel pipe, and a mechanical auxiliary dragging steel wire rope is adopted for moving.
2. Working principle and process
(1) Principle of operation
The loading machine hopper is used for lifting the rack to move to a proper position, and after the construction rack reaches the face, fine adjustment is carried out to connect the working rack with the face surrounding rock. Workers can quickly prepare before excavation and start the rock drilling operation by using illumination and the air and water pipes.
(2) Workflow process
Loading machine in place, hopper lifting rack, lifting and walking, rack in place, measuring and lofting, driller in place, starting drilling operation,
3. Safety measures
Manufacturing a bench operation protection platform: the guardrail framework is welded by adopting the threaded steel bars with the diameter of 20, a gap is reserved when the guardrail framework is welded, and the welding quality of a welding joint must be ensured. And after the framework is welded, a green protective net is installed, and the protective net is firmly bound with the guardrails. The operation rack sets up 2 cat ladders from top to bottom, arranges the rack both sides respectively.
4. Underpass house protection scheme
The first scheme is as follows: before the four-line large-section blasting construction, a plurality of house residents are moved, blasting construction is carried out after the movement, after the blasting is finished, a house appraisal unit is found to appraise the house again, and if the house is damaged in the blasting construction, the house is repaired; if the explosion does not damage the house, the residents do not need to be repaired after the explosion.
Scheme II: before the big section blasting construction of four-wire, remove several house residents, carry out reinforcement treatment to the house after the removal is accomplished, treat after the blasting, move the resident back.
The third scheme is as follows: before the four-line large-section blasting construction, the house is reinforced according to the identification report, residents do not need to move, and blasting construction is carried out after the house is reinforced.
The utility model discloses a construction method and construction structures have following advantage:
(1) adopt the utility model discloses a method, construction speed is fast, saves a large amount of manpowers, reduction in production cost.
(2) The construction arrangement is more reasonable, the construction progress is accelerated, the construction period and unnecessary labor cost are saved, and the task can be smoothly completed within a shorter construction period.
Although the present invention has been described with reference to the above embodiments, it is not intended to limit the present invention, and various alternatives and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a construction rack for large cross section tunnel excavation supporting construction, a serial communication port, including work platform, the work platform top is provided with the operation rack, the periphery of operation rack is provided with the protection platform, the protection network is installed to protection platform periphery, the protection network with the guardrail platform ligature is fixed, one side and the face country rock of operation rack meet, just be provided with twice cat ladder on the operation rack.
2. The construction rack for the large-section tunnel excavation supporting structure according to claim 1, wherein the construction rack is composed of vertical columns, longitudinal beams and side wings in a welded mode, the vertical columns and the longitudinal beams are made of 18I-steel, and the side wings are made of phi 89 steel pipes and phi 76 telescopic steel pipes.
3. The construction work bench of claim 1, wherein the working platform is used for the bench-up construction by raising and leveling earth excavated from the adjacent road tunnel by a loader and an excavator.
4. The construction rack for the excavation supporting structure of the large-section tunnel according to claim 1, wherein the two ladder stands are respectively provided at both sides of the working rack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921893217.4U CN211287710U (en) | 2019-11-05 | 2019-11-05 | Construction rack for excavation supporting structure of large-section tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921893217.4U CN211287710U (en) | 2019-11-05 | 2019-11-05 | Construction rack for excavation supporting structure of large-section tunnel |
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| Publication Number | Publication Date |
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| CN211287710U true CN211287710U (en) | 2020-08-18 |
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| CN201921893217.4U Active CN211287710U (en) | 2019-11-05 | 2019-11-05 | Construction rack for excavation supporting structure of large-section tunnel |
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