CN-121993230-A - Quick construction method for TBM double-track tunnel trackless transportation overline bypass cushion layer

Abstract

The invention discloses a rapid construction method for a cross-line bypass cushion layer of a TBM double-line tunnel in trackless transportation, which belongs to the technical field of tunnel construction, and comprises the steps of longitudinally dividing a construction area into a plurality of construction sections along a tunnel, organizing construction and transportation vehicles to perform framing and side-by-side alternate operation, realizing cushion layer pouring and trackless transportation in parallel, carrying out radar detection and roughening treatment on the top surface of an inverted arch block in preparation for construction, installing a steel plate water stop belt, penetrating a ground beam and a drainage blind pipe, adopting a detachable steel pipe to form a construction cushion layer drainage ditch, carrying out concrete pouring, multi-pass surface light receiving, steam and heat preservation maintenance and temperature and humidity monitoring after a steel bar net is paved, solving the problems of transportation interruption, long construction period and easiness in cracking in the traditional method through optimizing construction structures and processes, realizing high-efficiency, high-quality and low-interference cushion layer construction, scientifically screening optimal construction parameters through setting a comparison test section, and being high in adaptability.

Inventors

• ZHAO YUHAO
• CHEN DENGFENG
• WANG YANBO
• YANG HAO
• ZHAI HAOJIE
• YANG YONGXIANG
• SONG BAILIN
• LIU JINNAN
• WEI ZHIPING
• GAO ZHEN
• AN BO
• JIN WENJIE
• ZHOU YONGJUN
• ZHAO HU
• HAN XUHUI
• Tian Pengyang
• WANG LEI
• LI XIAOHU
• NIU KE
• LI ZAN

Assignees

• 中铁隧道局集团有限公司
• 中铁隧道集团二处有限公司
• 中铁第一勘察设计院集团有限公司

Dates

Publication Date

20260508

Application Date

20260202

Claims (10)

1. 1. The rapid construction method of the cross-line bypass cushion layer for the trackless transportation of the TBM double-line tunnel is characterized by comprising the following steps of: for each construction section, organizing construction equipment and a transport vehicle to alternately operate in a framing and side-dividing manner, and realizing parallel construction and trackless transport of a cushion layer (4); And (3) sequentially performing construction preparation, water stop and embedded part installation, cushion drainage ditch (6) construction, reinforcing steel bar net (14) construction, and concrete pouring and curing.
2. 2. The rapid construction method for the cross-line bypass cushion layer for the trackless transportation of the TBM double-line tunnel according to claim 1, wherein the cushion layer (4) is a permanent structural layer arranged on the top surface of the tunnel overhead arch block (1), the cross sections of the cushion layer are symmetrically arranged on two sides, and a central drainage ditch (5) is arranged between the cushion layers (4) on two sides.
3. 3. The rapid construction method for a TBM double-track tunnel trackless transportation overline bypass cushion according to claim 1, wherein the construction preparation comprises: Cleaning and flushing the top surface of the inverted arch block (1), and detecting the backfill compactness of the bottom by adopting radar scanning; and (3) roughening the top surface of the inverted arch block (1) and the short side wall (3), wherein the roughening rate is not lower than 95%, and the roughening height of the short side wall (3) is equal to the design height of the cushion layer (4).
4. 4. The rapid construction method for the cross-line bypass cushion for the trackless transportation of the TBM double-line tunnel according to claim 1, wherein the water stop and embedded part installation comprises a steel plate water stop installation, a through ground beam 12 installation and a blind pipe installation; The steel plate water stop belt installation comprises: Cutting a joint at a design position of the side surface of the short side wall (3), wherein the joint is 5mm wide and 15cm deep; single-side knocking of steel plate water stop extending into a straight shape and then embedding the joint slits, ensuring straight installation; the through floor beam 12 mounting includes: spring line positioning at the mounting position of the through ground beam 12; drilling holes in the top surface of the inverted arch block (1) by adopting an impact drill, inserting the ground beam steel bars (11), and binding and installing the through ground beam (12) on the ground beam steel bars (11); The blind pipe installation includes: cleaning and dredging holes of a triangular area reserved blind pipe 10 reserved in the triangular area (2); the blind pipe is connected by using a 90-degree joint and fixed above the through ground beam (12) at the side of the short side wall (3), and extends to the side position of the cushion drainage ditch (6); the construction of bedding drainage ditch (6) adopts the steel pipe design, includes: before the concrete construction, fixing the steel pipe at the drainage ditch part, wherein one half of the steel pipe is embedded into the concrete, and the other half of the steel pipe is exposed; Taking out the steel pipe after the concrete is finally set to form a semicircular drainage ditch; and cleaning the cushion drainage ditch (6), the cushion drainage blind pipe (7) and the side ditch drainage blind pipe (8) and protecting by geotechnical cloth.
5. 5. The rapid construction method for a TBM double-track tunnel trackless transportation overline bypass cushion according to claim 1, wherein the reinforcing mesh (14) construction comprises: the top of the inverted arch block (1) is provided with positioning ribs (13) distributed in a rectangular array; and the steel bar mesh (14) is fixed on the positioning ribs (13) in a binding and lap joint mode.
6. 6. The rapid construction method for the cross-line bypass cushion of the trackless transportation of the TBM double-line tunnel according to claim 1, wherein the concrete pouring and curing comprises the following steps: Adopting a concrete pump truck to perform one-way pouring; vibrating by a manual hand-held vibrator; Finishing surface treatment before initial setting of concrete by primarily flattening a horizontal scraper, secondarily collecting a pavement polishing machine and manually troweling the pavement for three times; after the concrete is initially set, a steam curing frame is erected by using tarpaulin and a seamless steel pipe, and an atomization generator is configured for steam curing; Steam curing is continued until the next group of concrete pouring is finished; And (5) covering with geotextile after curing, and sprinkling water for moisturizing, wherein the total curing time is not less than 14 days.
7. 7. The rapid construction method for the cross-line bypass cushion for the trackless transportation of the TBM double-line tunnel according to claim 1, further comprising embedding a temperature sensor (15) in the core of the cushion (4) before concrete pouring, continuously monitoring the hydration heat temperature of the concrete, monitoring the hydration heat temperature for a period of not less than 14 days, and optimizing a maintenance process according to temperature data.
8. 8. The rapid construction method for the cross-line bypass cushion for the trackless transportation of the TBM double-line tunnel according to claim 1 is characterized by further comprising the steps of traffic test and crack monitoring, wherein after the cushion layer (4) reaches the design strength, small-load traffic test and heavy-load traffic test are carried out in stages, and a crack observer is adopted to monitor and record the shape, width, depth and development condition of cracks on the surface of the cushion layer (4) in the whole process.
9. 9. A method for selecting an optimal construction scheme of a cushion layer based on the rapid construction method for a track-free transportation overline bypass cushion layer of a TBM double-track tunnel according to any one of claims 1 to 8, which is characterized by comprising the following steps: Longitudinally arranging a plurality of parallel test sections with different construction parameters along a tunnel, wherein the construction parameters comprise at least one of concrete strength grade, reinforcing steel bar mesh (14) configuration, framing pouring length and whether an embedded part is arranged; carrying out unified traffic load test and crack monitoring on the cushion layer (4) subjected to construction of each test section; Based on the time, the number and the development condition of the cracks and the overall condition of the cushion layer (4), the influences of different construction parameters on the crack resistance and the bearing capacity of the cushion layer (4) are compared and analyzed, and the construction parameter combination with the optimal comprehensive performance is screened out to be used as a standard scheme for subsequent construction.
10. 10. The method for selecting an optimal construction scheme for a bedding layer according to claim 9, wherein the step of comparing and screening comprises: When test data show that the crack resistance and the bearing performance of the plain concrete cushion layer (4) meet the requirements under the short framing pouring and fine curing process, the parameter combination without the reinforcing mesh (14) is screened and determined to be the optimal scheme.

Description

Quick construction method for TBM double-track tunnel trackless transportation overline bypass cushion layer Technical Field The invention relates to the technical field of tunnel construction, in particular to a rapid construction method for a TBM double-track tunnel trackless transportation overline bypass cushion. Background In the construction of a double-line tunnel of a TBM (full face tunnel boring machine), a concrete cushion layer is usually required to be applied to the top surface of an inverted arch block of a tunnel in order to ensure safe and efficient passage of subsequent trackless transport vehicles (such as a muck car, a concrete tank car, a commuter car and the like). The cushion layer is not only used as a driving road surface, but also integrates auxiliary functions such as a drainage ditch, a pre-buried rail passing pipe and the like, and is a key structure for guaranteeing smoothness of the whole construction logistics of the tunnel. However, the conventional cushion layer construction method has the following prominent defects that the method is difficult to adapt to the efficient and continuous tunneling rhythm of the TBM tunnel: The construction efficiency is low, and TBM tunneling is seriously disturbed, wherein the traditional method mainly adopts a site formwork supporting and segmented full-section cast-in-situ process. The process is complicated, and the concrete curing period is long, so that the trackless transportation line must be interrupted for a long time and in a full width. The method is fundamentally contradictory with the rapid transportation requirements of materials, personnel and equipment required by TBM continuous tunneling, and is extremely easy to cause the stop of TBM waiting for the materials and seriously affect the overall construction progress. The structure safety and the durability are insufficient, and the existing method lacks fine control on the combination quality of the cushion layer and the lower elevation arch block and the self bearing capacity. The problems of improper treatment of the joint surface, inaccurate control of the reinforcement protection layer, insufficient release of temperature and shrinkage stress and the like are easy to cause diseases such as pavement sedimentation, breakage, through cracks and the like of the cushion layer under repeated rolling of a heavy-duty vehicle, potential safety hazards are buried, and the later maintenance cost is increased. The construction organization is complex, the safety risk is high, and the cross line construction and the transportation operation space are crossed and time overlapped. The traditional scheme needs to frequently conduct traffic guiding change and switch construction and traffic areas. The difficulty of on-site coordination management is greatly increased, the flow routes of personnel and equipment are disordered, the collision risk is obviously increased, and the material supply is difficult to guarantee. The adaptability is poor, the economical efficiency is poor, and the construction parameters of the traditional 'one-cut' are difficult to adapt to the differences of different tunnel sections, geological conditions and vehicle loads. Meanwhile, the comprehensive construction cost is high due to the fact that a large amount of disposable templates are used, maintenance water resources are wasted and TBM downtime loss caused by construction interruption is caused. Therefore, research and development of a TBM double-track tunnel trackless transportation overline bypass cushion construction method capable of realizing rapid construction, parallel transportation, safety, reliability, economy and applicability has become a key subject to be solved in the technical field of tunnel construction. Disclosure of Invention The invention aims to provide a rapid construction method for a cross-line bypass cushion layer of a TBM double-line tunnel trackless transportation. The invention realizes the above purpose through the following technical scheme: a rapid construction method for a TBM double-track tunnel trackless transportation overline bypass cushion layer comprises the following steps: for each construction section, organizing construction equipment and a transport vehicle to alternately operate in a framing and side-dividing manner, so as to realize parallel cushion construction and trackless transport; and (5) sequentially performing construction preparation, water stop and embedded part installation, bedding drainage ditch construction, reinforcing steel bar net construction, concrete pouring and maintenance. Preferably, the cushion layer is a permanent structural layer arranged on the top surface of the tunnel inverted arch block, the cross section of the cushion layer is symmetrically arranged on both sides, and a central drainage ditch is arranged between the cushion layers on both sides. Preferably, the preparation for construction comprises: cleaning and flushing the top sur