CN109519179B - Special-shaped well shield starting construction method - Google Patents
Special-shaped well shield starting construction method Download PDFInfo
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- CN109519179B CN109519179B CN201811267788.7A CN201811267788A CN109519179B CN 109519179 B CN109519179 B CN 109519179B CN 201811267788 A CN201811267788 A CN 201811267788A CN 109519179 B CN109519179 B CN 109519179B
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- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
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- 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
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- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a construction method for shield launching of a special-shaped well, which comprises the following steps: s1) casting a first originating platform and a second originating platform, provided with a reaction frame installation groove, each of the first originating platform and the second originating platform comprising two single-sided originating platforms arranged symmetrically about the tunnel axis, each of the single-sided originating platforms having a horizontal installation surface and an installation slope surface; s2) installing two parallel originating guide rails on the installation inclined surfaces of the first originating platform and the second originating platform along the symmetrical tunnel axis; s3) assembling the shield machine in the abnormal-shaped well and installing the shield machine on one end of the starting guide rail far away from the starting tunnel door; s4) fixing a reaction frame in the reaction frame mounting groove; s5) installing a plurality of shield moving piers on the horizontal installation surfaces of the first and second initial platforms symmetrically to the axis of the tunnel; s6) fixing a pushing device between the shield moving pier and the shield machine; s7) pushing the shield tunneling machine to move through a pushing device; s8) breaking the originating tunnel portal. The method has the advantages of better stability and rigidity of the initial structure, short manufacturing period and low cost.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a special-shaped well shield starting construction method.
Background
In the shield construction of the tunnel, the shield launching of the prior art adopts a starting structure of a double reaction frame steel supporting frame structure and a starting bracket to realize the shield launching, specifically, the starting bracket of the steel structure is erected between a starting well and an end wall, a shield body of the shield machine is erected on the starting bracket, then the double reaction frame is installed on the ground of the starting well at the position of the tail part of the shield body of the shield machine, and 12 horizontal supporting steel pipes are installed between a construction surface to be excavated and the double reaction frame, in some special-shaped wells with larger sizes, the shield launching lifting opening is too far away from the end wall, or the starting bracket or the reaction frame cannot be placed due to the size limitation of the starting well in the conventional shield starting well and the starting bracket or the reaction frame body is lacked in the actual launching construction, and at this time, if the conventional starting construction is adopted, the starting construction process is more complicated, and the stability and rigidity of the originating structure are deteriorated, which brings a great risk to the originating construction.
Disclosure of Invention
The invention aims to provide a shield launching construction method for a special-shaped well, which can solve the problem that a shield launching hoisting port in the special-shaped well is too far away from an end wall or a conventional shield launching well is limited by the size of the launching well and cannot be provided with a launching bracket or a reaction frame, and the starting structure is poor in rigidity due to the lack of a launching bracket or a reaction frame body in actual launching construction.
In order to achieve the above object, an embodiment of the present invention provides a construction method for starting a shield of a special-shaped well, where the construction method includes: s1) according to the measurement lofting result, sequentially pouring a first originating platform and a second originating platform which have the same height from an originating tunnel portal along the originating reverse direction of the shield machine at the bottom of the special-shaped well, and arranging a reaction frame installation groove with a first width between the first originating platform and the second originating platform in the direction perpendicular to the originating reverse direction, wherein the first originating platform and the second originating platform respectively comprise two single-side originating platforms arranged along a symmetrical tunnel axis, each single-side originating platform is provided with a horizontal installation surface and an installation inclined surface with a first included angle with the horizontal installation surface, and the installation inclined surfaces of the two single-side originating platforms arranged along the symmetrical tunnel axis are oppositely arranged; s2) installing two parallel originating guide rails on the installation slant of the first originating station and the second originating station symmetrically to the tunnel axis so that each originating guide rail straddles the installation slant of the first originating station and the second originating station; s3) assembling the shield machine in the abnormal-shaped well, and arranging a shield body of the assembled shield machine on one end of the starting guide rail far away from the starting tunnel door; s4) installing a reaction frame in the reaction frame installation groove and fixing with the first and second origination stations; s5) installing a plurality of shield moving piers on the outer side of the two originating guide rails along the extending direction of the two originating guide rails on the horizontal installation surfaces of the first originating station and the second originating station in symmetry with the tunnel axis; s6) respectively fixing shield machine moving thrusters between two symmetrical shield body moving piers nearest to the shield machine and the shield machine; s7) pushing the shield machine to move through the pushing device, stopping pushing after the end face of the cutter head of the shield machine is away from the starting tunnel portal by a specified length, and assembling negative ring segments between the shield tail and the reaction frame when the shield machine moves to the shield tail of the shield body of the shield machine along the starting direction and exceeds the reaction frame during pushing; s8) the starting tunnel portal is broken, and the shield tunneling machine digs to finish shield starting.
Further, in step S1), according to the measurement lofting result, sequentially casting a first originating station and a second originating station having the same height from the originating tunnel portal to the originating opposite direction of the shield machine at the bottom of the special-shaped well, including: determining the dimension of the profile of each single-side originating platform of the first originating platform and the second originating platform and the position of a reaction frame mounting groove according to the measurement lofting result; setting out a plurality of bar planting points in the profile of each single-side originating station, planting bars on the bar planting points and performing reinforcement binding to form a reinforcement cage of each single-side originating station, wherein the reinforcement cage of each single-side originating station is provided with a cage horizontal plane and a cage inclined plane with a first included angle with the cage horizontal plane; respectively welding a plurality of bearing steel plates on the framework inclined plane and the framework horizontal plane of the steel reinforcement framework of each single-side originating station at preset intervals along the originating direction according to the measurement lofting result; welding a positioning steel plate connected with the end of the steel reinforcement framework of each unilateral originating station in the reaction frame mounting groove; welding a supporting steel plate at a position which is away from the framework horizontal plane of the steel reinforcement framework of each one-side originating station of the second originating station by a first distance from the reaction frame installation groove according to the measurement lofting result; fitting the profile of the steel reinforcement framework of each single-side originating station and installing a pouring template to form a pouring cavity; injecting concrete into the casting cavity to form the first and second origination decks; and maintaining the first and second cast original platforms.
Preferably, the first included angle is between 15 ° and 30 °.
Further, the step S2) of installing two parallel originating guide rails on the installation slant surfaces of the first originating station and the second originating station symmetrically to the tunnel axis so that each originating guide rail straddles the installation slant surfaces of the first originating station and the second originating station includes: and welding each originating guide rail with a plurality of bearing steel plates on the framework inclined plane of the steel reinforcement framework of each single-side originating platform of the first originating platform and the second originating platform.
Further, the step S4) of installing a reaction frame in the reaction frame installation groove and fixing with the first and second origination stations includes: hoisting the reaction frame into the reaction frame mounting groove; fixing one surfaces of the two upright columns of the reaction frame, facing the first originating station, to positioning steel plates welded to the ends of the steel frameworks of each single-side originating station of the corresponding first originating station respectively, and fixing one surfaces of the two upright columns of the reaction frame, facing the second originating station, to positioning steel plates welded to the ends of the steel frameworks of each single-side originating station of the corresponding second originating station respectively; and a plurality of supporting inclined struts are welded between the reaction frame and the supporting steel plates on the framework horizontal plane of the steel reinforcement framework of each single-side originating platform of the second originating platform.
Further, the step S5) of installing a plurality of shield moving piers on the horizontal installation surface of the first and second origination platforms, symmetrically to the tunnel axis, includes: and (3) correspondingly welding a plurality of shield moving piers with a plurality of bearing steel plates on the horizontal plane of the framework of the steel reinforcement framework of each single-side originating station one by one.
Further, in the step S6), the pushing device is a separate hydraulic jack.
Further, the breaking of the originating portal in the step S8) includes: a scaffold is erected between a cutter head of the shield tunneling machine and the starting tunnel portal; and stripping off the steel bars in the structural wall where the starting tunnel portal is located.
The invention provides a shield launching construction method of a special-shaped well, which adopts a launching structure that a first launching platform and a second launching platform are poured at the bottom of the special-shaped well and a launching track is arranged on the first launching platform and the second launching platform to replace a launching bracket in the prior art, the first launching platform and the second launching platform are integrated with the special-shaped well through pouring, the strength and the rigidity of the launching structure are better, and compared with the launching bracket, the launching structure has short manufacturing period and lower cost; in the construction method provided by the invention, only one reaction frame is used, the reaction frame is hoisted into the reaction frame installation groove between the first originating platform and the second originating platform, and then the reaction frame, the first originating platform and the second originating platform are respectively fixed to form the anti-floating structure, so that the stability and the rigidity of the reaction frame are greatly improved, and after the starting shield operation is completed by adopting the construction method, the steps of dismantling redundant reaction frames and hoisting the starting structure out of a well mouth are omitted, the construction cost of post-treatment is effectively saved, and the construction period of the tunnel is shortened.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
Fig. 1 is a flow chart of steps of a shield launching construction method for a special-shaped well provided by an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a flow chart of steps of a shield launching construction method for a special-shaped well provided by an embodiment of the invention. The construction method for starting the shield of the abnormal-shaped well provided by the invention comprises the following steps: s1) according to the measurement lofting result, sequentially pouring a first originating platform and a second originating platform which have the same height from an originating tunnel portal along the originating reverse direction of the shield machine at the bottom of the special-shaped well, and arranging a reaction frame installation groove with a first width between the first originating platform and the second originating platform in the direction perpendicular to the originating reverse direction, wherein the first originating platform and the second originating platform respectively comprise two single-side originating platforms arranged along a symmetrical tunnel axis, each single-side originating platform is provided with a horizontal installation surface and an installation inclined surface with a first included angle with the horizontal installation surface, and the installation inclined surfaces of the two single-side originating platforms arranged along the symmetrical tunnel axis are oppositely arranged; s2) installing two parallel originating guide rails on the installation slant of the first originating station and the second originating station symmetrically to the tunnel axis so that each originating guide rail straddles the installation slant of the first originating station and the second originating station; s3) assembling the shield machine in the abnormal-shaped well, and arranging a shield body of the assembled shield machine on one end of the starting guide rail far away from the starting tunnel door; s4) installing a reaction frame in the reaction frame installation groove and fixing with the first and second origination stations; s5) installing a plurality of shield moving piers on the outer side of the two originating guide rails along the extending direction of the two originating guide rails on the horizontal installation surfaces of the first originating station and the second originating station in symmetry with the tunnel axis; s6) respectively fixing shield machine moving thrusters between two symmetrical shield body moving piers nearest to the shield machine and the shield machine; s7) pushing the shield machine to move through the pushing device, stopping pushing after the end face of the cutter head of the shield machine is away from the starting tunnel portal by a specified length, and assembling negative ring segments between the shield tail and the reaction frame when the shield machine moves to the shield tail of the shield body of the shield machine along the starting direction and exceeds the reaction frame during pushing; s8) the starting tunnel portal is broken, and the shield tunneling machine digs to finish shield starting.
According to the shield launching construction method for the special-shaped well, the first originating platform and the second originating platform are poured at the bottom of the special-shaped well, the poured first originating platform and the poured second originating platform are integrated with the special-shaped well, and the originating structure formed by installing the originating guide rails on the installation inclined surfaces of the first originating platform and the second originating platform replaces an originating bracket in the prior art; the construction method provided by the invention only uses one reaction frame, and the reaction frame is arranged in a reaction frame mounting groove between the first originating platform and the second originating platform and is vertically arranged in the opposite direction and then fixedly connected with the first originating platform and the second originating platform, so that the reaction frame is more stably mounted; the shield tunneling machine is moved before tunneling through a pushing device arranged between the shield tunneling machine and a shield moving pier, after the pushing device pushes the shield tunneling machine to move for a certain distance, the connection between the pushing device and the shield moving pier is removed, the pushing device is connected with the next shield moving pier adjacent to the shield moving pier, the shield tunneling machine is pushed again to move until the end face of a cutter head of the shield tunneling machine moves to a specified length from a starting tunnel portal, the pushing device stops pushing (normally, the specified length is the width of a negative ring segment), when the shield tail of the shield tunneling machine exceeds the reaction frame during pushing, the negative ring segment is assembled between the reaction frame and the shield tail of the shield tunneling machine, and when the cutter head of the shield tunneling machine begins to cut off the soil on the starting tunnel portal which is cut off, and ending the shield starting.
Further, in step S1), according to the measurement lofting result, sequentially casting a first originating station and a second originating station having the same height from the originating tunnel portal to the originating opposite direction of the shield machine at the bottom of the special-shaped well, including: determining the dimension of the profile of each single-side originating platform of the first originating platform and the second originating platform and the position of a reaction frame mounting groove according to the measurement lofting result; setting out a plurality of bar planting points in the profile of each single-side originating station, planting bars on the bar planting points and performing reinforcement binding to form a reinforcement cage of each single-side originating station, wherein the reinforcement cage of each single-side originating station is provided with a cage horizontal plane and a cage inclined plane with a first included angle with the cage horizontal plane; respectively welding a plurality of bearing steel plates on the framework inclined plane and the framework horizontal plane of the steel reinforcement framework of each single-side originating station at preset intervals along the originating direction according to the measurement lofting result; welding a positioning steel plate connected with the end of the steel reinforcement framework of each unilateral originating station in the reaction frame mounting groove; welding a supporting steel plate at a position which is away from the framework horizontal plane of the steel reinforcement framework of each one-side originating station of the second originating station by a first distance from the reaction frame installation groove according to the measurement lofting result; fitting the profile of the steel reinforcement framework of each single-side originating station and installing a pouring template to form a pouring cavity; injecting concrete into the casting cavity to form the first and second origination decks; and maintaining the first and second cast original platforms.
In one embodiment, after the steel bars are planted at a plurality of steel bar planting points and steel bar binding is performed to form the steel bar framework of each single-side originating station, when the steel bars are designed and distributed, a protective layer of a general steel bar framework structure is 7cm, the protective layer is planed after the boundary of a first originating station and a second originating station is determined to form stirrup bars, main bars and distribution bars, the main stress surface of the first originating station and the second originating station is an installation inclined surface, the framework inclined surface of the steel bar framework of each single-side originating station after concrete pouring is formed into the installation inclined surface, two main bars are arranged at a steel bearing plate on each framework inclined surface, and a construction bar and an embedded part supporting angle steel are additionally arranged between the distribution bars and the stirrup bars to strengthen the overall strength and rigidity of the steel bar framework of each single-side originating station; welding a supporting steel plate at a position which is on the horizontal plane of the framework of the steel reinforcement framework of each single-side originating station of the second originating station and is away from the reaction frame mounting groove by a first distance, wherein the supporting steel plate can be formed by splicing a plurality of steel plates, the plurality of steel plates are sequentially laid along the originating reverse direction of the shield tunneling machine from an originating tunnel portal, and the plurality of steel plates are welded with the steel reinforcement framework of each single-side originating station of the second originating station; determining the installation position of the pouring template according to the measurement lofting result, after the pouring template is installed, retesting the pouring template installed by adhering to the inclined plane of the framework, ensuring the longitudinal straightness of the inclined plane of the framework and a first included angle between the inclined plane of the framework and the horizontal plane of the framework, adopting the arrangement mode of a longitudinal main edge and a vertical secondary edge for the pouring template, and adopting the mode of butterfly buckles and oppositely-pulling lead screws and stirrup ribs for tensioning the pouring templates; and concrete is injected into the pouring cavity to form the first and second initial platforms, specifically, the concrete with the same mark number as that of the backfilled special-shaped bottom plate sinking structure is poured, so that the later treatment is not needed, the pouring adopts a large-volume concrete pouring mode, the pouring is performed at one time, the pouring forming effect of the installation inclined plane is strictly controlled during the pouring, the consistency with the design is ensured, and the concrete is uniformly vibrated during the pouring construction.
Preferably, the first included angle is between 15 ° and 30 °. Specifically, the first included angle is selected according to the size of the shield machine used in specific construction, for example, when the shield body diameter of the shield machine is 6410mm, more preferably, the first included angle is 27 °.
Further, the step S2) of installing two parallel originating guide rails on the installation slant surfaces of the first originating station and the second originating station symmetrically to the tunnel axis so that each originating guide rail straddles the installation slant surfaces of the first originating station and the second originating station includes: and welding each originating guide rail with a plurality of bearing steel plates on the framework inclined plane of the steel reinforcement framework of each single-side originating platform of the first originating platform and the second originating platform. Each originating guide rail straddling the installation inclined surfaces of the first originating station and the second originating station is fixed on the installation inclined surfaces of the first originating station and the second originating station in a manner of welding with a plurality of supporting steel plates on the framework inclined surfaces of the steel reinforcement framework of each one-side originating station of the first originating station and the second originating station, and the fixing manner is convenient, easy to operate and firm.
Further, the step S4) of installing a reaction frame in the reaction frame installation groove and fixing with the first and second origination stations includes: hoisting the reaction frame into the reaction frame mounting groove; fixing one surfaces of the two upright columns of the reaction frame, facing the first originating station, to positioning steel plates welded to the ends of the steel frameworks of each single-side originating station of the corresponding first originating station respectively, and fixing one surfaces of the two upright columns of the reaction frame, facing the second originating station, to positioning steel plates welded to the ends of the steel frameworks of each single-side originating station of the corresponding second originating station respectively; and a plurality of supporting inclined struts are welded between the reaction frame and the supporting steel plates on the framework horizontal plane of the steel reinforcement framework of each single-side originating platform of the second originating platform.
In one embodiment, the width of the reaction frame installation groove is 1.2m, the dimension of the two columns of the reaction frame in the width direction of the reaction frame installation groove is 0.6m, after the reaction frame is hoisted into the reaction frame installation groove, the columns of the reaction frame cannot be simultaneously fixed with the positioning steel plates welded to the ends of the steel frameworks of each of the first originating station and the second originating station, so that after the columns of the reaction frame are fixed with the first originating station or the second originating station, i-shaped steel is placed between the columns of the reaction frame and the first originating station or the second originating station, preferably, the columns of the reaction frame are welded with the positioning steel plates welded to the ends of the steel frameworks of each of the second originating station, and then gaps between the columns of the reaction frame and the positioning steel plates welded to the ends of the steel frameworks of each of the first originating station are placed (for example, placing 20b I-beams), welding the I-beams with positioning steel plates welded to the columns of the reaction frame and the ends of the steel reinforcement frameworks of each single-side originating station of the first originating station at the same time to form an anti-floating structure, preventing the reaction frame from bottom floating after being stressed too much, after the reaction frame is initially fixed, in order to strengthen the rigidity of the reaction frame, generally welding at least two supporting inclined struts between the columns of the reaction frame and the supporting steel plates on the framework horizontal plane of the steel reinforcement frameworks of each single-side originating station of the second originating station to reinforce the reaction frame, wherein the supporting inclined struts can be seamless steel pipes, for example, seamless steel pipes with the diameter of 609mm and the wall thickness of 16mm are selected as supporting inclined struts, and longitudinal triangular stable stress structures are formed between the supporting inclined struts and the columns and the second originating station, the reaction frame structure is strengthened.
Further, the step S5) of installing a plurality of shield moving piers on the horizontal installation surface of the first and second origination platforms, symmetrically to the tunnel axis, includes: and (3) correspondingly welding a plurality of shield moving piers with a plurality of bearing steel plates on the horizontal plane of the framework of the steel reinforcement framework of each single-side originating station one by one.
The plurality of shield body moving piers are fixed on the first originating station and the second originating station in a mode of being welded with a plurality of supporting steel plates on the horizontal plane of the framework of the steel reinforcement framework of each single-side originating station, so that the shield body moving piers can be firmly moved when the pushing device pushes the shield machine to move, and sufficient driving reaction force can be generated to enable the shield machine to move.
Further, in the step S6), the pushing device is a separate hydraulic jack.
In one embodiment, a plurality of reaction piers are generally welded on the surface of the shield body of the shield machine near the horizontal plane, and a separate hydraulic jack is installed between the reaction piers and the shield body moving pier, one end of the separate hydraulic jack is fixed with the shield body moving pier, and the other end of the separate hydraulic jack is fixed with the reaction piers for pushing the shield machine to move, for example, the separate hydraulic jack is a 100-ton separate hydraulic jack.
Further, the breaking of the originating portal in the step S8) includes: a scaffold is erected between a cutter head of the shield tunneling machine and the starting tunnel portal; and stripping off the steel bars in the structural wall where the starting tunnel portal is located.
In one embodiment, a scaffold is erected between a cutter head of the shield tunneling machine and the originating tunnel portal, the originating tunnel portal is broken in two layers, the first layer of breaking is carried out from bottom to top, the breaking thickness is 20cm, and three persons carry out breaking operation simultaneously in a mode of firstly middle and then two sides with the purpose of stripping outer-layer steel bars of the originating tunnel portal; and the second layer of breaking is carried out on the basis of the first layer of breaking, the breaking thickness is 30cm from top to bottom, the thickness of 20cm including the glass fiber ribs in the underground diaphragm wall where the starting tunnel portal is located is finally reserved, then the underground diaphragm wall is ground by rotating a cutter head of the shield tunneling machine, the rotating speed of the cutter head of the shield tunneling machine is 1.2 revolutions per minute when the underground diaphragm wall is ground, the torque is controlled within 4300 KN-m to prevent the safety shaft from being broken, and foam injection operation is carried out while the underground diaphragm wall is ground for cutter head lubrication and construction dust reduction of the shield tunneling machine.
The invention provides a shield launching construction method of a special-shaped well, which adopts a launching structure that a first launching platform and a second launching platform are poured at the bottom of the special-shaped well and a launching track is arranged on the first launching platform and the second launching platform to replace a launching bracket in the prior art, the first launching platform and the second launching platform are integrated with the special-shaped well through pouring, the strength and the rigidity of the launching structure are better, and compared with the launching bracket, the launching structure has short manufacturing period and lower cost; in the construction method provided by the invention, only one reaction frame is used, the reaction frame is hoisted into the reaction frame installation groove between the first originating platform and the second originating platform, and then the reaction frame, the first originating platform and the second originating platform are respectively fixed to form the anti-floating structure, so that the stability and the rigidity of the reaction frame are greatly improved, and after the starting shield operation is completed by adopting the construction method, the steps of dismantling redundant reaction frames and hoisting the starting structure out of a well mouth are omitted, the construction cost of post-treatment is effectively saved, and the construction period of the tunnel is shortened.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. A construction method for starting a shield of a special-shaped well is characterized by comprising the following steps:
s1) determining the dimension of the profile of each one-side originating station of the first originating station and the second originating station and the position of the reaction frame mounting groove according to the measurement lofting result;
setting out a plurality of bar planting points in the profile of each single-side originating station, planting bars on the bar planting points and performing reinforcement binding to form a reinforcement cage of each single-side originating station, wherein the reinforcement cage of each single-side originating station is provided with a cage horizontal plane and a cage inclined plane with a first included angle with the cage horizontal plane;
respectively welding a plurality of bearing steel plates on the framework inclined plane and the framework horizontal plane of the steel reinforcement framework of each single-side originating station at preset intervals along the originating direction according to the measurement lofting result; welding a positioning steel plate connected with the end of the steel reinforcement framework of each unilateral originating station in the reaction frame mounting groove;
welding a supporting steel plate at a position which is away from the framework horizontal plane of the steel reinforcement framework of each one-side originating station of the second originating station by a first distance from the reaction frame installation groove according to the measurement lofting result;
fitting the profile of the steel reinforcement framework of each single-side originating station and installing a pouring template to form a pouring cavity;
injecting concrete into the casting cavity to form the first and second origination decks;
maintaining the first and second cast original platforms;
a reaction frame installation groove with a first width is arranged between the first originating platform and the second originating platform in a direction perpendicular to the originating reverse direction, wherein the first originating platform and the second originating platform respectively comprise two single-side originating platforms arranged symmetrically along the tunnel axis, each single-side originating platform is provided with a horizontal installation surface and an installation inclined surface with a first included angle relative to the horizontal installation surface, and the installation inclined surfaces of the two single-side originating platforms arranged symmetrically along the tunnel axis are oppositely arranged;
s2) installing two parallel originating guide rails on the installation slant of the first originating station and the second originating station symmetrically to the tunnel axis so that each originating guide rail straddles the installation slant of the first originating station and the second originating station;
s3) assembling the shield machine in the abnormal-shaped well, and arranging the shield body of the assembled shield machine at one end of the starting guide rail far away from the starting tunnel door;
s4) installing a reaction frame in the reaction frame installation slot and fixed with the first and second origination stations, including:
hoisting the reaction frame into the reaction frame mounting groove;
fixing one surfaces, facing the first originating station, of two stand columns of the reaction frame with a positioning steel plate welded to the end of the steel reinforcement framework of each single-side originating station of the corresponding first originating station respectively, wherein an I-shaped steel is placed between the positioning steel plate welded to the end of the steel reinforcement framework of each single-side originating station of the first originating station and the stand columns, and fixing one surfaces, facing the second originating station, of the two stand columns of the reaction frame with a positioning steel plate welded to the end of the steel reinforcement framework of each single-side originating station of the corresponding second originating station respectively;
welding a plurality of supporting inclined struts between the reaction frame and a supporting steel plate on the framework horizontal plane of the steel reinforcement framework of each single-side originating platform of the second originating platform;
s5) installing a plurality of shield moving piers on the outer sides of the two originating guide rails along the extending direction of the two originating guide rails on the horizontal installation surfaces of the first originating station and the second originating station in symmetry with the tunnel axis;
s6) respectively fixing shield machine moving thrusters between two symmetrical shield body moving piers nearest to the shield machine and the shield machine;
s7) pushing the shield machine to move through the pushing device, stopping pushing after the end face of the cutter head of the shield machine is away from the starting tunnel portal by a specified length, and assembling negative ring segments between the shield tail and the reaction frame when the shield machine moves to the shield tail of the shield body of the shield machine along the starting direction and exceeds the reaction frame during pushing;
s8) the starting tunnel portal is broken, and the shield machine tunnels.
2. The method of claim 1, wherein the first included angle is between 15 ° and 30 °.
3. The construction method according to claim 1, wherein the step S2) of installing two parallel originating guide rails on the installation slant surfaces of the first originating station and the second originating station symmetrically to the tunnel axis so that each originating guide rail straddles the installation slant surfaces of the first originating station and the second originating station comprises:
and welding each originating guide rail with a plurality of bearing steel plates on the framework inclined plane of the steel reinforcement framework of each single-side originating platform of the first originating platform and the second originating platform.
4. The construction method according to claim 1, wherein the step S5) of installing a plurality of shield moving piers on the horizontal installation surfaces of the first and second origination platforms with symmetrical tunnel axes includes:
and (3) correspondingly welding a plurality of shield moving piers with a plurality of bearing steel plates on the horizontal plane of the framework of the steel reinforcement framework of each single-side originating station one by one.
5. The construction method according to claim 1, wherein the thrusting device in step S6) is a separate hydraulic jack.
6. The construction method according to claim 1, wherein the breaking of the originating portal in the step S8) comprises:
a scaffold is erected between a cutter head of the shield tunneling machine and the starting tunnel portal;
and stripping off the steel bars in the structural wall where the starting tunnel portal is located.
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| CN109519179B true CN109519179B (en) | 2021-03-02 |
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| CN112012753B (en) * | 2020-09-17 | 2021-07-27 | 江苏西尔德建设工程有限公司 | Shield tunneling machine starting method based on special-shaped extension steel ring |
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| CN205654350U (en) * | 2016-05-27 | 2016-10-19 | 中铁二十一局集团轨道交通工程有限公司 | Earth pressure balance shield machine starts and sidewinders correcting device |
| CN205918428U (en) * | 2016-07-14 | 2017-02-01 | 中铁工程装备集团机电工程有限公司 | From advancing formula shield structure machine dolly that misses stop |
| CN106640185A (en) * | 2016-12-26 | 2017-05-10 | 中铁二局集团有限公司 | Station crossing device and method for shield tunneling machine |
| CN206816263U (en) * | 2017-06-26 | 2017-12-29 | 中铁四局集团有限公司 | Lowering or hoisting gear is translated for semi-enclosed station shield machine |
| CN207033454U (en) * | 2017-08-11 | 2018-02-23 | 中铁工程装备集团技术服务有限公司 | It is a kind of can quick regulation shield launching guide table device |
| CN108442933B (en) * | 2018-03-02 | 2020-11-24 | 中铁十二局集团有限公司 | Shield starting base and shield starting method |
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