CN111878095A - Construction method for existing underground structure of newly-built channel connection without reserved interface - Google Patents
Construction method for existing underground structure of newly-built channel connection without reserved interface Download PDFInfo
- Publication number
- CN111878095A CN111878095A CN202010802266.3A CN202010802266A CN111878095A CN 111878095 A CN111878095 A CN 111878095A CN 202010802266 A CN202010802266 A CN 202010802266A CN 111878095 A CN111878095 A CN 111878095A
- Authority
- CN
- China
- Prior art keywords
- newly
- underground structure
- existing underground
- interface
- built channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
Abstract
The invention provides a construction method for a newly-built channel to plug into an existing underground structure without a reserved interface, which belongs to the technical field of subway engineering and comprises the following steps: s10, constructing a newly-built channel, wherein the newly-built channel is located underground and comprises a primary support and a secondary lining, the secondary lining is located on the inner side of the primary support, a first interface is reserved on the secondary lining, the first interface is used for connecting an existing underground structure, the newly-built channel is adjacent to the existing underground structure, S20 is carried out, the part, located at the first interface, of the primary support is broken, a connecting hole is formed, S30 is carried out, the part, located at the first interface, of the existing underground structure is broken, a second interface is formed, S40 is carried out, a reinforcing structure is constructed, the first interface and the second interface are connected, and connection and communication between the newly-built channel and the existing underground structure are achieved; the construction method for connecting the newly-built channel to the existing underground structure without the reserved interface can solve the technical problem of how to connect the newly-built channel and the existing underground structure without the reserved interface.
Description
Technical Field
The invention belongs to the technical field of subway engineering, and particularly relates to a construction method for a newly-built channel to be connected with an existing underground structure without a reserved interface.
Background
Subways have become an important way of modern urban transportation trips. With the enlargement of the urban scale, the construction of urban subways is continuously developed, and subway line networks are continuously added with lines and are mutually staggered. Due to the rapid development speed, the population scale of cities is often greatly increased in a short time, and the existing subway transfer stations cannot meet the current requirements, so that the existing subway stations need to be enlarged to meet the increasing pedestrian volume. For example, a transfer station where two subway lines in a certain city intersect is seriously insufficient in transfer capacity, a large number of passengers are blocked in a transfer passage in the morning and evening peak periods, so that the serious congestion degree is reached, and great potential safety hazards exist.
In order to solve the problems, a new transfer passage is needed to be created so as to shunt the people flow in the existing transfer passage, eliminate the congestion and meet the transfer requirement. Because the problem of later stage extension generally can not be considered when existing station is built in earlier stage, how newly-built transfer passageway links into the technical problem that needs to solve in order to need urgently with existing station structure.
Disclosure of Invention
The invention aims to provide a construction method for connecting an existing underground structure without a reserved interface with a newly-built channel, and aims to solve the technical problem of how to connect the existing underground structure without the reserved interface with the newly-built channel.
In order to achieve the purpose, the invention adopts the technical scheme that a construction method for connecting an existing underground structure without a reserved interface by a newly-built channel is provided, and the method comprises the following steps:
step S10, constructing a newly-built channel, wherein the newly-built channel is located underground and comprises a primary support and a secondary lining, the secondary lining is located on the inner side of the primary support and is reserved with a first interface, the first interface is used for connecting an existing underground structure, and the newly-built channel is adjacent to the existing underground structure;
step S20, breaking the part of the primary support positioned at the first interface to form a connecting hole;
step S30, breaking the part of the existing underground structure located at the first interface to form a second interface;
and step S40, constructing a reinforcing structure, connecting the first interface and the second interface, and realizing the connection and communication between the newly-built channel and the existing underground structure.
As another embodiment of the present application, a waterproof connecting stub is preset on the first interface, a first waterproof layer is arranged in the newly-built channel, and the waterproof connecting stub is an exposed end of the first waterproof layer;
after the step S20 is completed and before the step S30 is started, step S21 is performed: and connecting the waterproof connecting stub with a second waterproof layer arranged on the existing underground structure.
As another embodiment of the present application, the step S21 includes the following specific steps:
cutting the second waterproof layer and reserving a lapping part with a certain width, wherein the lapping part is used for connecting the waterproof connecting stubbles;
and overlapping the waterproof connecting stub and the lap joint part and pressing the waterproof connecting stub and the lap joint part tightly on the side wall of the existing underground structure, so that the waterproof connecting stub and the lap joint part are connected seamlessly.
As another embodiment of the present application, the second interface is opened on a concrete wall of the existing underground structure, and the breaking step in step S30 includes:
irradiating the edge part of the area to be damaged on the concrete wall by using microwaves;
utilizing high-pressure water flow to impact the wall surface irradiated by the microwave to form holes;
and a hydraulic expander is arranged in the hole, and the hydraulic expander is used for extruding and stripping the concrete at the edge of the area to be broken, so that the concrete block of the area to be broken is separated from the concrete wall, and the second interface is formed.
As another embodiment of the present application, the reinforcing structure is a cast-in-place ring beam, and the cast-in-place ring beam is used for simultaneously connecting the first interface and the second interface.
As another embodiment of this application, first interface is equipped with first steel bar joint, the second interface is equipped with the second steel bar joint, first steel bar joint and second steel bar joint pass through the reinforcing bar connector and connect, first steel bar joint, second steel bar joint and reinforcing bar connector are used for being pour in the cast-in-place ring roof beam.
As another embodiment of the present application, the step S10 of constructing the newly-built channel by shallow-buried excavation includes the following steps:
step S11, grouting the soil around the newly-built channel from the ground surface by adopting a deep hole grouting method, and forming a compact grouting body;
step S12, excavating the newly-built channel by using a CRD method, and constructing an intermediate wall and the primary support at the same time;
step S13, the intermediate wall is broken in sections, and a scaffold is built in the newly-built channel;
step S14, applying the first waterproof layer tightly to the inner wall of the primary support;
step S15, constructing the secondary lining on the inner side of the first waterproof layer and reserving the first interface.
As another embodiment of the present application, in step S12, the newly-built channel is divided into four parts, which are: a first portion located above and distal from the existing underground structure, a second portion located above and proximal to the existing underground structure, a third portion located below and distal from the existing underground structure, and a fourth portion located below and proximal to the existing underground structure.
As another embodiment of the present application, the excavation sequence of the four parts in the newly-built channel is determined according to specific requirements:
if the construction displacement needs to be strictly controlled, the excavation sequence is the first part, the third part, the second part and the fourth part from first to last in sequence;
and if the construction safety needs to be strictly controlled, the excavation sequence is the second part, the fourth part, the first part and the third part from first to last in sequence.
As another embodiment of the present application, the cross-section of the intermediate wall is cross-shaped and is divided into a vertical partition wall located in the middle, a first transverse partition wall located far away from the existing underground structure, and a second transverse partition wall located close to the existing underground structure;
in the step S13, the first transverse partition, the second transverse partition and the vertical partition are sequentially arranged in the order of the partition.
Compared with the prior art, the construction method for connecting the existing underground structure without the reserved interface of the newly-built channel provided by the invention has the advantages that the first interface is reserved, the primary support and the existing underground structure of the newly-built channel are broken step by step to form the connecting hole and the second interface, then the reinforcing structure is constructed, and the connection and the extension of the newly-built channel and the existing underground structure without the reserved interface are realized, so that the existing underground station without the reserved interface can be rebuilt and expanded, the transfer space is enlarged, and the increasing transfer requirements are met.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structure diagram after step S10 of the construction method for connecting an existing underground structure without a reserved interface with a newly-built channel according to the embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram after step S20 of the construction method for connecting an existing underground structure without a reserved interface with a newly-built channel according to the embodiment of the present invention;
fig. 3 is a schematic cross-sectional structure diagram after step S30 of the construction method for connecting an existing underground structure without a reserved interface with a newly-built channel according to the embodiment of the present invention;
fig. 4 is a schematic cross-sectional structure diagram after step S40 of the construction method for connecting an existing underground structure without a reserved interface with a newly-built channel according to the embodiment of the present invention;
FIG. 5 is an enlarged view taken at A in FIG. 1;
FIG. 6 is an enlarged view at B of FIG. 2;
fig. 7 is a schematic diagram of a second interface formed by breaking an existing underground structure through a static breaking technique according to an embodiment of the present invention;
FIG. 8 is an enlarged view at C of FIG. 4;
fig. 9 is a schematic cross-sectional structure diagram of a newly-built channel constructed by a CRD method according to an embodiment of the present invention.
In the figure: 1. newly building a channel; 11. primary support; 12. secondary lining; 13. a first interface; 14. connecting the hole; 15. a first waterproof layer; 151. waterproof stubble connection; 16. a first rebar junction; 171. a first portion; 172. a second portion; 173. a third portion; 174. a fourth part; 181. erecting a partition wall; 182. a first horizontal partition wall; 183. a second horizontal partition wall; 2. existing underground structures; 21. a second interface; 22. a second waterproof layer; 23. a concrete wall; 24. a region to be destroyed; 25. a hole; 26. a second rebar junction; 3. a reinforcing structure; 4. and (5) compacting the grouting body.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to fig. 4, a description will now be given of a construction method for connecting an existing underground structure without a reserved interface with a newly-built channel according to the present invention. The construction method for the existing underground structure without the reserved interface for the connection of the newly-built channel comprises the following steps:
step S10, constructing a newly-built channel 1, wherein the newly-built channel 1 is located underground and comprises a primary support 11 and a secondary lining 12, the secondary lining 12 is located on the inner side of the primary support 11 and is reserved with a first interface 13, the first interface 13 is used for connecting an existing underground structure 2, and the newly-built channel 1 is adjacent to the existing underground structure 2, as shown in FIG. 1;
step S20, breaking the part of the preliminary bracing 11 located at the first interface 13 to form a connection hole 14, as shown in fig. 2;
step S30, breaking the part of the existing underground structure 2 located at the first interface 13 to form a second interface 21, as shown in fig. 3;
and step S40, constructing the reinforcing structure 3, connecting the first interface 13 and the second interface 21, and realizing the connection and communication between the newly-built channel 1 and the existing underground structure 2, as shown in FIG. 4.
Compared with the prior art, the construction method for connecting the existing underground structure without the reserved interface of the newly-built channel provided by the invention has the advantages that the first interface 13 is reserved, the primary support 11 and the existing underground structure 2 of the newly-built channel 1 are broken step by step to form the connecting opening 14 and the second interface 21, then the reinforcing structure 3 is constructed, and the connection and communication between the newly-built channel 1 and the existing underground structure 2 without the reserved interface are realized, so that the existing underground station without the reserved interface can be rebuilt and expanded, the transfer space is expanded, and the increasing transfer requirements are met.
As a specific embodiment of the construction method for connecting the existing underground structure without the reserved interface through the newly-built channel provided by the invention, the waterproof connecting stub 151 is preset on the first interface 13, the first waterproof layer 15 is arranged in the newly-built channel 1, and the waterproof connecting stub 151 is an exposed end of the first waterproof layer 15, as shown in fig. 5;
after the step S20 is completed and before the step S30 is started, i.e., after the preliminary bracing 11 is broken to form the connection hole 14, and before the existing underground structure 2 is broken to form the second port 21, the step S21 is performed: the waterproof connecting stub 151 is connected to the second waterproof layer 22 provided on the existing underground structure 2, as shown in fig. 6.
Specifically, the method for breaking the preliminary bracing 11 to form the connecting hole 14 includes: the shotcrete of the preliminary bracing 11 is peeled off by microwave irradiation, the reinforcing mesh in the preliminary bracing 11 is exposed, and then the reinforcing mesh is cut by a pair of pliers.
As a specific implementation manner of the construction method for connecting the existing underground structure without the reserved interface through the newly-built channel, step S21, which is a step of connecting the waterproof connecting stub 151 and the second waterproof layer 22, includes the following specific steps: firstly, cutting the second waterproof layer 22 and reserving a lap joint part with a certain width, wherein the lap joint part is used for connecting the waterproof connecting stub 151; then, the waterproof connecting stub 151 is overlapped with the lap joint portion and pressed against the side wall of the existing underground structure 2, so that seamless connection between the waterproof connecting stub 151 and the lap joint portion is realized.
Specifically, the waterproof connecting stub 151 and the overlapping portion may be compressed in various manners, for example, after the waterproof connecting stub 151 and the overlapping portion are overlapped, the waterproof connecting stub 151 and the overlapping portion are compressed by a pressing strip, and the pressing strip is fixed on the side wall of the existing underground structure 2 by expansion bolts; the waterproof connecting stubbles 151 and the lap joint part can also be compressed by utilizing the annular steel plate, so that the seamless connection between the waterproof connecting stubbles and the lap joint part is realized; the polyurethane sealant can be used for scraping and compacting, when a pit appears on the surface of a base layer, the inner loose surface of the pit is firstly removed, then the pit is washed by high-pressure water, after the pit is dried, the polyurethane sealant is used for filling and compacting, when a crack larger than 3mm appears on the base layer, 10cm of the crack is required to be brushed with a polyurethane film-coating waterproof reinforced layer with the thickness of 1mm, then a polyester cloth reinforced layer is arranged, and finally the waterproof layer is brushed.
As a specific implementation of the construction method for connecting the existing underground structure without the reserved interface through the newly-built channel provided by the present invention, the second interface 21 is provided on the concrete wall 23 of the existing underground structure 2, as shown in fig. 3 and 7, and the breaking step in step S30 includes:
step S31 of irradiating the edge portion of the area to be broken 24 on the concrete wall 23 with microwaves, the area to be broken 24 being indicated by a dashed box in fig. 7;
step S32, using high-pressure water flow to impact the wall surface irradiated by the microwave to form holes 25, wherein the microwave irradiation can rapidly heat minerals in the concrete, the minerals with different sensitivities are subjected to thermal stress at the grain boundary and the inner part due to differential thermal expansion, and when the stress exceeds the strength of the concrete, the concrete can be damaged and cracked;
step S33, a hydraulic expander is placed in the hole 25, and the hydraulic expander is used to squeeze and strip the concrete at the edge of the area to be broken 24, so that the concrete block in the area to be broken 24 is separated from the concrete wall 23, thereby forming the second connector 21.
The holes 25 are arranged along the edge of the to-be-broken region 24 in a plurality of numbers, when the hydraulic expanders in all the holes 25 work simultaneously, concrete at the edge of the to-be-broken region 24 can be extruded and broken to form a broken belt with the same shape as the edge of the to-be-broken region 24, and after exposed reinforcing steel bars are cut off by a cutting machine, concrete blocks in the to-be-broken region 24 can be separated from the concrete wall 23 or fall off integrally, so that static breaking of the concrete wall 23 is realized. Compared with the traditional vibration breaking method, the static breaking method can greatly reduce the vibration damage to the existing underground structure 2, reduce the potential safety hazard caused by the breaking operation, ensure the normal operation of the existing underground structure 2, greatly reduce the noise, basically eliminate the noise pollution generated by construction, greatly improve the breaking precision and accurately control the designed hole opening range and shape.
Specifically, the hydraulic expander is in the prior art, is tubular and can be inserted into the hole 25, and then the extrusion force generated by a hydraulic system is utilized to extrude the concrete, so that the concrete is crushed and peeled off; the outermost side of the hydraulic expander is a thin-wall metal pipe, a polyurethane circular ring is coaxially arranged in the thin-wall metal pipe, and when the polyurethane circular ring is axially extruded by power provided by a hydraulic system, the polyurethane circular ring radially expands to further expand the thin-wall metal pipe, so that the functions of extruding and crushing concrete are realized.
As a specific embodiment of the construction method for connecting the existing underground structure without the reserved interface through the newly-built channel provided by the present invention, please refer to fig. 4 and 8, the reinforcement structure 3 is a cast-in-place ring beam, and the cast-in-place ring beam is used for simultaneously connecting the first interface 13 and the second interface 21. Specifically, the cast-in-place ring beam is simultaneously connected with the annular edge end surfaces of the first connector 13 and the second connector 21, so that the secondary lining 12 is connected with the main body of the existing underground structure 2 into a whole, and the connection and the communication of the newly-built channel 1 and the existing underground structure 2 are realized.
As a specific embodiment of the construction method for connecting the existing underground structure without the reserved interface through the newly-built channel provided by the invention, the first interface 13 is provided with a first steel bar joint 16, as shown in fig. 5, 6 and 8; the second connector 21 is provided with a second rebar junction 26, as shown in fig. 8; the first steel bar joint 16 and the second steel bar joint 26 are connected through a steel bar connector, the first steel bar joint 16, the second steel bar joint 26 and the steel bar connector are used for being poured in a cast-in-place ring beam, the cast-in-place ring beam is guaranteed to have enough strength, meanwhile, the newly-built channel 1 and the existing underground structure 2 can be further guaranteed to be firmly and reliably connected, and the use requirements are met.
The first reinforcement bar coupler 16 is generally an exposed part of a reinforcement cage in the secondary lining 12, and the second reinforcement bar coupler 26 may be an original reinforcement bar in a concrete wall 23 on an existing underground structure 2, or the second reinforcement bar coupler 26 may be implanted on the concrete wall 23 by using a cement-based adhesive material; the steel bar connector is the prior art, can utilize the sleeve type structure to connect the first steel bar joint 16 and the second steel bar joint 26 firmly, convenient and fast; after the first steel bar joint 16 and the second steel bar joint 26 are connected through the steel bar connector, the formworks can be assembled at the first interface 13 and the second interface 21, then concrete is injected into a pouring cavity defined by the formworks, a cast-in-place ring beam can be formed after curing for set time, and the secondary lining 12 and the existing underground structure 2 are connected into a whole.
As a specific implementation manner of the construction method for connecting the existing underground structure without the reserved interface of the newly-built channel provided by the invention, in step S10, the newly-built channel 1 is constructed by a shallow-buried underground excavation method. The shallow-buried underground excavation method is an operation method for carrying out underground excavation construction of various underground caverns under the ground close to the ground surface, does not basically influence ground surface traffic during construction, and is a construction method with wide application. The method for constructing the newly-built channel 1 by the shallow-buried underground excavation method comprises the following steps:
step S11, grouting the soil around the newly-built channel 1 from the ground surface by adopting a deep hole grouting method, and forming a compact grouting body 4; deep hole grouting is an existing method, a deep hole is drilled on the ground above a newly-built channel 1, concrete is injected into the deep hole by using tools such as a grouting pump, and a compact grouting body 4 can be formed above the newly-built channel 1, so that the stability of a soil body above the newly-built channel 1 is greatly enhanced, and the safety risk caused by overlarge settlement is prevented;
step S12, excavating the newly-built channel 1 by using a CRD method, and constructing an intermediate wall and a primary support 11 at the same time; the CRD method is a tunnel construction method suitable for softer strata, has good effect on controlling ground surface settlement, and is widely applied to urban underground tunnel engineering.
Step S13, the intermediate wall is broken in sections, and a scaffold is built in the newly-built channel 1; specifically, the scaffold can be a full red scaffold.
Step S14, applying a first waterproof layer 15 closely attached to the inner wall of the primary support 11;
step S15, constructing a secondary lining 12 on the inner side of the first waterproof layer 15 and reserving a first interface 13; meanwhile, the first steel bar joint 16 and the waterproof connecting stub 151 are reserved.
Excavating the newly-built channel 1 by a shallow-buried underground excavation method and a CRD method, and stabilizing the soil body above the newly-built channel 1 by adopting a deep hole grouting method before excavation to ensure the smooth construction of the newly-built channel 1; meanwhile, in the CRD method, the primary support 11 of the newly-built channel 1 can bear the pressure of an external soil body, so that a hole can be designed in the secondary lining 12, and the reservation of the first interface 13 is realized.
Generally, when the secondary lining 12 reaches the design strength and combines with the monitoring condition, the scaffold inside the primary support 11 within 1.2 meters can be dismantled, and then the primary support 11 at the hole is broken to form the connecting hole 14.
As a specific embodiment of the construction method for connecting the existing underground structure without the reserved interface of the newly-built channel provided by the present invention, referring to fig. 9, in step S12, the newly-built channel 1 is divided into four parts to be excavated, which are respectively: a first section 171 located above and away from the existing underground structure 2, a second section 172 located above and near the existing underground structure 2, a third section 173 located below and away from the existing underground structure 2, and a fourth section 174 located below and near the existing underground structure 2.
As a specific embodiment of the construction method for connecting the existing underground structure without the reserved interface of the newly-built channel provided by the present invention, please refer to fig. 9, and the excavation sequence of the four parts in the newly-built channel 1 is determined according to specific requirements: in the first scheme, if the displacement of the existing underground structure 2 caused by the excavation of the newly-built channel 1 needs to be strictly controlled, the excavation sequence is a first part 171, a third part 173, a second part 172 and a fourth part 174 from first to last in sequence; in the second scheme, if deformation of the existing underground structure 2 caused by stress disturbance generated by excavation of the newly-built channel 1 needs to be strictly controlled, the excavation sequence is from first to last, namely the second part 172, the fourth part 174, the first part 171 and the third part 173.
And (3) establishing a plane strain mechanical model of 'stratum-newly-built channel-existing underground structure' by using finite element software, and simulating the excavation steps of the scheme I and the scheme II to obtain the influence of the excavation of the newly-built channel 1 on the stress, deformation and displacement of the existing underground structure 2. The analysis structure results show that: when the first two parts, namely the first part 171 and the third part 173 far away from the existing underground structure 2, are excavated, the stress disturbance on the existing underground structure 2 is small, and the displacement generated by the existing underground structure 2 is small, but when the second two parts, namely the second part 172 and the fourth part 174 close to the existing underground structure 2, are excavated, the stress disturbance is large, and the overall disturbance degree is greater than that of the second part; in the second scheme, when the first two parts, namely the second part 172 and the fourth part 174 close to the existing underground structure 2, are excavated, certain stress disturbance is generated on the existing underground structure 2, so that certain displacement is generated, and after the second two parts, namely the first part 171 and the third part 173 far away from the existing underground structure 2 are excavated and the secondary lining 12 is constructed, the deformation of the existing underground structure 2 can be effectively inhibited, and the overall disturbance degree can be effectively controlled. Therefore, if the displacement of the existing underground structure 2 caused by disturbance in the excavation process needs to be strictly controlled, especially the displacement of the existing underground structure 2 in the first two parts of excavation needs to be controlled, the excavation sequence of the scheme one is recommended; and if the overall disturbance degree in the excavation process needs to be controlled, and the safety is ensured, recommending a second scheme.
As a specific embodiment of the construction method for connecting the existing underground structure without the reserved interface through the newly-built channel provided by the invention, please refer to fig. 9, wherein the cross section of the intermediate wall is cross-shaped and is divided into a vertical partition wall 181 positioned in the middle, a first transverse partition wall 182 far away from the existing underground structure 2 and a second transverse partition wall 183 close to the existing underground structure 2; in step S13, the partition walls are broken in the order of first transverse partition wall 182, second transverse partition wall 183, and vertical partition wall 181 from the beginning to the end. For a shallow buried structure, the vertical sinking displacement is greater than the horizontal convergence displacement, so that the horizontal support is firstly removed, and the vertical support is finally removed, and the removing sequence is favorable for ensuring the stability of the existing structure. And after the mid-partition is broken, a full-hall red scaffold is built in the newly-built channel 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The construction method for the existing underground structure without the reserved interface in the process of connecting the newly-built channel is characterized by comprising the following steps of:
step S10, constructing a newly-built channel, wherein the newly-built channel is located underground and comprises a primary support and a secondary lining, the secondary lining is located on the inner side of the primary support and is reserved with a first interface, the first interface is used for connecting an existing underground structure, and the newly-built channel is adjacent to the existing underground structure;
step S20, breaking the part of the primary support positioned at the first interface to form a connecting hole;
step S30, breaking the part of the existing underground structure located at the first interface to form a second interface;
and step S40, constructing a reinforcing structure, connecting the first interface and the second interface, and realizing the connection and communication between the newly-built channel and the existing underground structure.
2. The construction method of a newly-built channel for connecting an existing underground structure without a reserved interface according to claim 1, wherein a waterproof connecting stub is preset on the first interface, a first waterproof layer is arranged in the newly-built channel, and the waterproof connecting stub is an exposed end of the first waterproof layer;
after the step S20 is completed and before the step S30 is started, step S21 is performed: and connecting the waterproof connecting stub with a second waterproof layer arranged on the existing underground structure.
3. The construction method of the existing underground structure with the newly-built channel connection unreserved interface according to claim 2, wherein the step S21 comprises the following specific steps:
cutting the second waterproof layer and reserving a lapping part with a certain width, wherein the lapping part is used for connecting the waterproof connecting stubbles;
and overlapping the waterproof connecting stub and the lap joint part and pressing the waterproof connecting stub and the lap joint part tightly on the side wall of the existing underground structure, so that the waterproof connecting stub and the lap joint part are connected seamlessly.
4. The method of claim 1, wherein the second port is opened on a concrete wall of the existing underground structure, and the step of breaking in S30 includes:
irradiating the edge part of the area to be damaged on the concrete wall by using microwaves;
utilizing high-pressure water flow to impact the wall surface irradiated by the microwave to form holes;
and a hydraulic expander is arranged in the hole, and the hydraulic expander is used for extruding and stripping the concrete at the edge of the area to be broken, so that the concrete block of the area to be broken is separated from the concrete wall, and the second interface is formed.
5. The construction method of a newly-built channel for connecting an existing underground structure without reserved interfaces according to claim 1, wherein the reinforcing structure is a cast-in-place ring beam, and the cast-in-place ring beam is used for simultaneously connecting the first interface and the second interface.
6. The construction method for connecting the existing underground structure without the reserved interface through the newly-built channel according to claim 5, wherein the first interface is provided with a first steel bar connector, the second interface is provided with a second steel bar connector, the first steel bar connector and the second steel bar connector are connected through a steel bar connector, and the first steel bar connector, the second steel bar connector and the steel bar connector are used for being poured in the cast-in-place ring beam.
7. The construction method of a newly-built channel for connecting an existing underground structure without a reserved interface according to claim 2, wherein the step S10 of constructing the newly-built channel by a shallow-buried underground excavation method comprises the following steps:
step S11, grouting the soil around the newly-built channel from the ground surface by adopting a deep hole grouting method, and forming a compact grouting body;
step S12, excavating the newly-built channel by using a CRD method, and constructing an intermediate wall and the primary support at the same time;
step S13, the intermediate wall is broken in sections, and a scaffold is built in the newly-built channel;
step S14, applying the first waterproof layer tightly to the inner wall of the primary support;
step S15, constructing the secondary lining on the inner side of the first waterproof layer and reserving the first interface.
8. The method of claim 7, wherein in step S12, the newly-built channel is divided into four parts, which are: a first portion located above and distal from the existing underground structure, a second portion located above and proximal to the existing underground structure, a third portion located below and distal from the existing underground structure, and a fourth portion located below and proximal to the existing underground structure.
9. The construction method for connecting the existing underground structure without the reserved interface of the newly-built channel according to claim 8, wherein the excavation sequence of the four parts in the newly-built channel is determined according to specific requirements:
if the displacement of the existing underground structure caused by the excavation of the newly-built channel needs to be strictly controlled, the excavation sequence is the first part, the third part, the second part and the fourth part from first to last in sequence;
and if the deformation of the existing underground structure caused by stress disturbance generated by newly-built channel excavation needs to be strictly controlled, the excavation sequence is the second part, the fourth part, the first part and the third part from first to last in sequence.
10. The construction method of a newly-built channel for connecting an existing underground structure without a reserved interface according to claim 8, wherein the cross section of the intermediate wall is cross-shaped and is divided into a vertical partition wall positioned in the middle, a first transverse partition wall far away from the existing underground structure and a second transverse partition wall close to the existing underground structure;
in the step S13, the first transverse partition, the second transverse partition and the vertical partition are sequentially arranged in the order of the partition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010802266.3A CN111878095A (en) | 2020-08-11 | 2020-08-11 | Construction method for existing underground structure of newly-built channel connection without reserved interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010802266.3A CN111878095A (en) | 2020-08-11 | 2020-08-11 | Construction method for existing underground structure of newly-built channel connection without reserved interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111878095A true CN111878095A (en) | 2020-11-03 |
Family
ID=73203616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010802266.3A Pending CN111878095A (en) | 2020-08-11 | 2020-08-11 | Construction method for existing underground structure of newly-built channel connection without reserved interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111878095A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404083A (en) * | 2021-04-08 | 2021-09-17 | 中铁十六局集团有限公司 | Construction method of T-shaped communication structure |
| CN113668603A (en) * | 2021-07-31 | 2021-11-19 | 上海二十冶建设有限公司 | Waterproof construction method for joint of new and old pipe galleries |
| CN113847063A (en) * | 2021-09-26 | 2021-12-28 | 兰州理工大学 | Tunnel secondary lining concrete construction simulation system and simulation method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871752A (en) * | 2010-06-28 | 2010-10-27 | 黄义干 | Hydraulic static blasting expansion tube |
| CN106193111A (en) * | 2015-05-08 | 2016-12-07 | 中铁隧道勘测设计院有限公司 | New subway gateway is crossed street with existing assembled and is connected design and construction method |
| CN107119711A (en) * | 2017-07-06 | 2017-09-01 | 中国铁路设计集团有限公司 | A kind of connected structure and construction method for abutting existing transfer station on a large scale |
| CN207032282U (en) * | 2017-07-06 | 2018-02-23 | 中国铁路设计集团有限公司 | A kind of connected structure for abutting existing transfer station on a large scale |
| CN108060927A (en) * | 2017-12-10 | 2018-05-22 | 北京工业大学 | Microwave mixes broken rock device with Water Cutting in a kind of tunnelling |
| CN108463020A (en) * | 2018-05-11 | 2018-08-28 | 东北大学 | Fracturing device in a kind of engineering rock mass HIGH-POWERED MICROWAVES hole |
| CN110043284A (en) * | 2019-04-26 | 2019-07-23 | 中铁二十三局集团第六工程有限公司 | The Urban Underground Passage excavating construction method of major hazard source is worn under a kind of |
| CN110984236A (en) * | 2019-11-25 | 2020-04-10 | 中交二航局第三工程有限公司 | Construction method for connecting point of sleeved type light and shade excavation structural portal interface |
-
2020
- 2020-08-11 CN CN202010802266.3A patent/CN111878095A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871752A (en) * | 2010-06-28 | 2010-10-27 | 黄义干 | Hydraulic static blasting expansion tube |
| CN106193111A (en) * | 2015-05-08 | 2016-12-07 | 中铁隧道勘测设计院有限公司 | New subway gateway is crossed street with existing assembled and is connected design and construction method |
| CN107119711A (en) * | 2017-07-06 | 2017-09-01 | 中国铁路设计集团有限公司 | A kind of connected structure and construction method for abutting existing transfer station on a large scale |
| CN207032282U (en) * | 2017-07-06 | 2018-02-23 | 中国铁路设计集团有限公司 | A kind of connected structure for abutting existing transfer station on a large scale |
| CN108060927A (en) * | 2017-12-10 | 2018-05-22 | 北京工业大学 | Microwave mixes broken rock device with Water Cutting in a kind of tunnelling |
| CN108463020A (en) * | 2018-05-11 | 2018-08-28 | 东北大学 | Fracturing device in a kind of engineering rock mass HIGH-POWERED MICROWAVES hole |
| CN110043284A (en) * | 2019-04-26 | 2019-07-23 | 中铁二十三局集团第六工程有限公司 | The Urban Underground Passage excavating construction method of major hazard source is worn under a kind of |
| CN110984236A (en) * | 2019-11-25 | 2020-04-10 | 中交二航局第三工程有限公司 | Construction method for connecting point of sleeved type light and shade excavation structural portal interface |
Non-Patent Citations (1)
| Title |
|---|
| 徐斌: ""既有地铁车站侧墙开洞浅析"", 《中外建筑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404083A (en) * | 2021-04-08 | 2021-09-17 | 中铁十六局集团有限公司 | Construction method of T-shaped communication structure |
| CN113668603A (en) * | 2021-07-31 | 2021-11-19 | 上海二十冶建设有限公司 | Waterproof construction method for joint of new and old pipe galleries |
| CN113847063A (en) * | 2021-09-26 | 2021-12-28 | 兰州理工大学 | Tunnel secondary lining concrete construction simulation system and simulation method |
| CN113847063B (en) * | 2021-09-26 | 2024-01-26 | 兰州理工大学 | Tunnel secondary lining concrete construction simulation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111878095A (en) | Construction method for existing underground structure of newly-built channel connection without reserved interface | |
| CN108677924B (en) | Double-row miniature steel pipe pile grouting wall-forming partition structure and method | |
| CN113294166A (en) | Large-section rectangular jacking pipe oblique starting method | |
| CN105909268A (en) | Pre-stress combined well/tunnel module structure construction method and module structure | |
| CN104831736A (en) | Support changing method and support changing structure of middle wall of foundation trench | |
| CN215057406U (en) | Extension structure is originated in rectangle push pipe slant | |
| CN113027495B (en) | Underground excavation large-span station construction method implemented by interval tunnel organization | |
| CN114352289A (en) | Air shaft duct and method for breaking shield tunnel segment in mine construction section | |
| CN107806101A (en) | Construction method of the bar shaped foundation ditch cast-in-place concrete to the prefabricated linking beam of support | |
| CN104963693B (en) | Rectangular parallel push pipe connection channel construction method | |
| CN105065040B (en) | A kind of prefabricated underground space tunneling construction method of top plate | |
| CN110735641B (en) | Construction method of transfer passage of underpass pipeline | |
| CN108930544A (en) | A kind of broken ground underground large space method of construction | |
| CN112983467A (en) | Treatment method for tunnel gate closing type large collapse | |
| CN112921986A (en) | Assembled underground structure and integrated construction method of assembled underground structure and foundation pit | |
| CN103397600A (en) | Method for arranging water stops in box body jacking process | |
| CN215108944U (en) | Arch subway station is opened up and is built structure of plugging into | |
| US4147452A (en) | Method for constructing a rectangularly shaped tunnel | |
| US3729164A (en) | Device for forming continuous walls, by means of consecutive, reinforced-concrete panels | |
| CN210483733U (en) | Prefabricated steel-UHPC composite pipe curtain device | |
| CN204676560U (en) | The support changing structure for use of foundation ditch mid-board | |
| CN113565533A (en) | Arch subway station building connection structure and construction method | |
| CN210857187U (en) | I-shaped GFRP-I-shaped steel joint structure and splicing cage for underground continuous wall | |
| CN113107532B (en) | Temporary vertical support dismantling and waterproof construction method for inverted arch range of tunnel by drilling and blasting method | |
| CN105156136B (en) | Water pipe primary concreting forming panel and forming method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210107 Address after: 300350 Shuanggang Township, Jinnan District, Tianjin Applicant after: CHINA RAILWAY 18 BUREAU GROUP Co.,Ltd. Applicant after: CHINA RAILWAY 18 BUREAU GROUP MUNICIPAL ENGINEERING Co.,Ltd. Applicant after: SHIJIAZHUANG TIEDAO University Address before: 300350 Shuanggang Township, Jinnan District, Tianjin Applicant before: CHINA RAILWAY 18 BUREAU GROUP Co.,Ltd. Applicant before: SHIJIAZHUANG TIEDAO University |
|
| TA01 | Transfer of patent application right | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201103 |
|
| RJ01 | Rejection of invention patent application after publication |