CN-122013817-A - Method for reinforcing deformation joint on subway cover

CN122013817ACN 122013817 ACN122013817 ACN 122013817ACN-122013817-A

Abstract

The invention discloses a method for reinforcing deformation joints on subway covers, which relates to the technical field of subway engineering and comprises the steps of determining the basic construction and layout positions of the deformation joints, forming a complete material system, carrying out working procedure construction of base layer treatment, structural reinforcement, sealing seepage prevention and surface protection according to a design scheme, defining quality control standards before construction, carrying out working procedure self-checking and special spot checking during construction, carrying out seepage prevention, deformation resistance performance detection and acceptance checking after construction, and setting temporary protection facilities of the deformation joints during construction and before subway communication, and establishing a periodic inspection and maintenance mechanism. According to the invention, through the synergistic effect of dynamic adaptive structural design, a complete material system with region and working condition adaptation, refined construction, full-period quality control and long-term protection maintenance mechanism, the problems of poor adaptability, poor anti-seepage and anti-falling effects and lack of full-period guarantee of a deformation joint processing method are solved, and the integrated guarantee of deformation joint adaptation, anti-seepage and anti-falling on a subway cover is realized.

Inventors

HE ZHILIN
ZHONG ZUOWEI
LAI SHENG
Xing Jinhuan
LIANG SIYU
XU JIANYI
GAN ZUWANG
LI ZHAN

Assignees

广西路桥集团建筑工程有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (10)

1. A method for reinforcing a deformation joint on a subway cover is characterized by comprising the following steps of: s1, designing a deformation joint structural scheme, namely acquiring subway construction regulations and stress characteristics of a subway upper cover property structure, and determining a deformation joint foundation structure and layout positions according to geological settlement and subway operation vibration influence; s2, selecting an adaptive material combination, namely screening an adaptive structural reinforcing material, a sealing seepage-proofing material and a protective material according to the waterproof, anti-deformation and durable requirements of the deformation joint to form a complete material system; s3, implementing a refined construction flow, namely performing working procedure construction of base layer treatment, structural reinforcement, sealing seepage prevention and surface protection according to a design scheme, and conforming to the construction operation specification of a subway protection area; s4, performing full-period quality control, namely defining a quality control standard before construction, performing process self-check and special spot check in construction, and performing anti-seepage and deformation resistance performance detection and acceptance check after construction; And S5, realizing long-acting protection and maintenance, namely setting temporary protection facilities of deformation joints during construction and before subway passing, establishing a regular inspection and maintenance mechanism and timely treating potential hidden danger.
2. The method for reinforcing the deformation joint on the subway cover according to claim 1, wherein the determination of the basic structure and the layout position of the deformation joint according to the geological settlement and the influence of subway operation vibration comprises the following steps: two layers of pre-buried elastic connecting members are respectively arranged in the structures at two sides of the deformation joint, the upper layer members are distributed at equal intervals along the length direction of the deformation joint, the lower layer members and the upper layer members are distributed in a staggered way at 60 degrees, the intervals between adjacent members are comprehensively calculated and determined according to the maximum allowable deformation of the deformation joint, the subway operation vibration frequency and the geological sedimentation rate; The third channel sealing cavity is close to the inside of the structure, an annular ventilation drainage channel is arranged, a unidirectional water permeable valve is arranged at the joint of the channel and the sealing cavity, the top of the deformation joint is designed into a three-stage ladder type flow guiding structure, the height difference of each stage ladder is controlled to be 15-20 mm, the surface of the ladder is provided with a transverse anti-slip bump, the bottom of the deformation joint is communicated with a water collecting flow guiding groove along the length direction of the deformation joint, the inner wall of the flow guiding groove is treated by adopting an anti-corrosion coating, the bottom of the groove is provided with a drainage gradient of 1-2 per mill, two ends of the water collecting flow guiding groove are communicated with a main drainage system on a subway cover through branch pipes, and a detachable filter device is arranged in each branch pipe.
3. The method for reinforcing the deformation joint of the subway cover according to claim 2, wherein the steps of obtaining the subway construction specification and the subway cover property structure stress feature include: The method comprises the steps of collecting project site detailed geological survey reports, extracting soil layer distribution parameters, ground water level dynamic change data, soil layer compression modulus and long-term settlement prediction values of different depths, establishing a geological parameter database, researching subway operation line planning, train passing frequency, vehicle type parameters and track types, monitoring vibration frequency, amplitude range and propagation rules generated when a train passes through a field layout vibration sensor, recording vibration data of different time periods, carrying out statistical analysis, importing the geological parameter database and the vibration monitoring data into structural mechanics simulation software, establishing a deformation joint three-dimensional mechanical model, simulating deformation tendency of the deformation joint under different load combinations, calculating the width of the deformation joint, simultaneously calculating elastic modulus, bearing strength and fatigue life parameters of an elastic connecting member, selecting 3-5 hole sites to carry out test pile, setting deformation monitoring points in a test pile area, simulating subway operation vibration and structural dead weight load, monitoring actual deformation quantity of the deformation joint, reversely pushing and adjusting design parameters according to monitoring results, drawing detailed construction drawings according to finally determined parameters, defining the setting depth, spacing and fixing modes of pre-buried members, marking the size, position, thinning the guide structure, building the drainage pipeline, and verifying the joint drainage pipeline and the joint design requirements.
4. The method for reinforcing the deformation joint of the subway cover according to claim 3 is characterized in that the matched structural reinforcement material, sealing seepage-proofing material and protection material are selected according to the waterproof, deformation-resisting and durability requirements of the deformation joint to form a complete material system, the method comprises the steps of selecting the sealing seepage-proofing material which is waterproof and ageing-resistant and resistant to high and low temperature cycles according to weather characteristics, selecting high-strength corrosion-resistant steel as the structural reinforcement material, carrying out anti-corrosion coating treatment on the surface, selecting a high-molecular material with stable expansion rate as the sealing material adopts a composite system, selecting a high-molecular material with stable expansion rate as the sealing material when meeting water, selecting a double-component material with strong binding force with a concrete base layer as the elastic sealing material, carrying out anti-skid texture treatment on the surface, carrying out suitability test before all materials enter a field, and verifying the deformation resistance and seepage-proofing performance after the material combination.
5. A method for reinforcing a deformation joint on a subway cover according to claim 4, wherein the step S3 further comprises the steps of cleaning base layers on two sides of the deformation joint by adopting a small electric tool, removing scum, greasy dirt and loose concrete, repairing cracks of the base layers, fixing by adopting a special positioning clamp when an elastic connecting member is pre-buried, firmly connecting with steel bars of a main structure in a welding mode, installing a water-swelling type sealing element when a sealing cavity is constructed, compacting and fixing, injecting elastic sealing glue, and finally paving a ventilation drainage channel pipe, adopting a template support for forming when a stepped diversion structure is constructed, controlling diversion gradient, and paving a protective material according to design thickness when a surface protection construction, and smoothly connecting with structural surfaces on two sides of the deformation joint.
6. The method for reinforcing the deformation joint of the subway cover according to claim 5 is characterized in that a quality control standard is defined before construction, process self-checking and special spot check are carried out during construction, anti-seepage and deformation resistance performance detection and acceptance are carried out after construction, the method comprises the steps of organizing technology bottoms before construction, defining quality control points and detection methods of each process, carrying out special training on constructors, carrying out self-checking by a construction unit after each process is finished, carrying out spot check on the position of an embedded member, the filling quality of sealant and the gradient of a diversion structure after self-checking, adopting a water seepage test to detect anti-seepage performance, setting sealing barriers on two sides of the deformation joint, injecting clear water to a specified height, observing after maintaining the specified time, adopting a displacement sensor to monitor deformation joint anti-deformation performance, simulating subway operation vibration and structural settlement, recording the maximum displacement of the deformation joint and the integrity of the sealing structure, and finishing construction records, material qualification and detection report data in the acceptance stage, and the construction and inspection report data are jointly participated in acceptance inspection by construction, design, supervision and construction and subway related units.
7. A method for reinforcing a deformation joint on a subway cover according to claim 6 is characterized in that S5 further comprises the steps of adopting a detachable protective cover plate for temporary protective facilities, fixing the cover plate and two side structures of the deformation joint through bolts, arranging sealing rubber strips at the edges of the cover plate, making a monthly inspection plan, inspecting the integrity of the protective cover plate, ageing conditions of the sealing rubber strips, smoothness of a diversion structure and cracks of peripheral structures of the deformation joint, establishing maintenance accounts, recording inspection found problems and treatment measures, timely replacing and maintaining the ageing conditions of sealing materials, damage of the protective cover plate and the like, comprehensively inspecting the protective cover plate before subway passing, removing the temporary protective facilities, and finally inspecting the sealing structure of the deformation joint, the diversion structure and a surface protective layer.
8. The method for reinforcing the deformation joint on the subway cover according to claim 7, wherein the elastic connecting member is made of stainless steel, a polytetrafluoroethylene anti-corrosion coating is sprayed on the surface of the elastic connecting member, three-section barb expansion anchoring parts are arranged at two ends of the member, each anchoring part consists of an anchoring rod, barb structures and expansion sleeves, the anchoring rods are made of high-strength screw thread steel, the barb structures are spirally distributed, the expansion sleeves are made of elastic plastic materials, the depth of the anchoring parts embedded into the structures at two sides of the deformation joint is determined according to design requirements, the embedded reinforcement rubber is injected into the expansion sleeves after the anchoring parts are embedded, the reinforcement rubber is epoxy reinforcement rubber, firm connection between the anchoring parts and the concrete structure is ensured, and the pulling resistance meets the design requirements.
9. The method for reinforcing the deformation joint on the subway cover according to claim 8, wherein the breathable drainage channel pipe is made of high-density polyethylene, water permeable holes are formed in the surface of the pipe, the hole distances are uniformly distributed, two ends of the pipe are communicated with the water collecting diversion trenches, and filter cotton is filled in the channel.
10. The method for reinforcing the deformation joint on the subway cover according to claim 9, wherein when the sealing materials are combined, a layer of non-woven fabric buffer layer is paved at the bottom of the sealing cavity, then the water-swelling sealing element is installed, and the wall of the cavity is cleaned before the elastic sealing glue is injected.

Description

Method for reinforcing deformation joint on subway cover Technical Field The invention relates to the technical field of subway engineering, in particular to a method for reinforcing a deformation joint on a subway cover. Background The development of the subway upper cover property is an important form of intensive utilization of urban space, but a subway upper cover structure is closely related to a subway body, a deformation joint is used as a key node for structure expansion and settlement, the processing quality of the deformation joint directly influences the operation safety of a subway, and at present, the traditional deformation joint processing mostly adopts a single sealing or rigid connection mode, so that the problems are that firstly, the composite deformation of geological settlement and subway operation vibration is difficult to adapt, the sealing failure is easy to occur, secondly, the seepage prevention structure is single, the seepage is easy to occur when facing a rainy climate, thirdly, a full-period protection mechanism is lacking, the potential safety hazard is easy to be caused by sundries falling and material aging during construction and before subway passing, and thirdly, the durability of the processing effect is insufficient due to insufficient design and combination of regional climate and geological characteristics. How to realize deformation adaptation, seepage prevention and falling prevention integration of the deformation joint and meet the strict requirements of zero seepage and zero falling of the subway is a technical problem to be solved in the field. Disclosure of Invention In order to solve the technical problems, the technical scheme solves the problems by providing a method for reinforcing the deformation joint on the subway cover. In order to achieve the above purpose, the invention adopts the following technical scheme: A method for reinforcing a deformation joint on a subway cover comprises the following steps: the design of a deformation joint structural scheme comprises the steps of obtaining subway construction regulations and stress characteristics of a subway upper cover property structure, and determining a deformation joint foundation structure and layout positions according to geological settlement and subway operation vibration influence; Selecting an adaptive material combination, namely screening an adaptive structural reinforcing material, a sealing seepage-proofing material and a protective material according to the waterproof, deformation-resistant and durable requirements of a deformation joint to form a complete material system; The construction process is implemented in a refined way, namely working procedures of base layer treatment, structural reinforcement, sealing and seepage prevention and surface protection are carried out according to a design scheme, and the construction operation specification of a subway protection area is followed; The full-period quality control implementation comprises the steps of defining quality control standards before construction, developing process self-checking and special spot check in construction, and performing anti-seepage, deformation resistance performance detection and acceptance check after construction; And the long-acting protection and maintenance implementation is realized by arranging temporary protection facilities for deformation joints during construction and before subway train pass, establishing a regular inspection and maintenance mechanism and timely treating potential hidden danger. Preferably, determining the foundation structure and the layout position of the deformation joint according to the geological settlement and the subway operation vibration influence specifically comprises: two layers of pre-buried elastic connecting members are arranged in the structures on two sides of the deformation joint, the upper layer members are distributed at equal intervals along the length direction of the deformation joint, the lower layer members and the upper layer members are distributed in a 60-degree staggered mode, the distance between adjacent members is comprehensively calculated and determined according to the maximum allowable deformation of the deformation joint, the subway operation vibration frequency and the geological sedimentation rate, three independent sealing cavities are arranged on the outer side of the elastic connecting members along the depth direction, the first sealing cavity is close to the surface layer of the structure and filled with water-swelling sealing elements, the sealing elements are installed in a segmented splicing mode, sealing glue is adopted at the splicing position, the second sealing cavity is located in the middle layer and filled with high-elasticity sealing glue in a high-pressure injection mode, and the injection pressure is adjusted by using a pressure calculation formula, wherein the pressure calculation formula is as follows: ; In the formula, In