Construction method for shield empty pushing through underground excavation and secondary starting counter-force device
By using arc guide and jack push mode in shield construction, combined with the embedded parts of the secondary initiator reaction device and the embedded parts for dismantling lugs, the shield machine is solved in the construction of the concealed excavation section. The long cycle and high cost problems have achieved safe and efficient tunnel construction.
Patent Information
- Application Number
- CN202411384187.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-20
AI Technical Summary
In shield construction, when the shield machine is constructed in the concealed excavation section, the construction period is long, the machinery usage rate is high, the safety hazards are high, and the secondary starting conditions are different from those at the starting well, resulting in high construction costs.
A construction method is adopted, including using arc-shaped guide concrete as bracket after the construction of the concealed tunnel is completed, installing steel rails as guide rails, and using jack-top push mode to perform air push of the shield machine, combined with a secondary initiation reverse The embedded parts of the force device and the embedded parts for dismantling lugs ensure the smooth passage of the shield machine through the hidden tunnel.
It reduces the use of machinery, saves construction period and costs, improves construction efficiency, and ensures construction progress and safety.
Smart Images
Figure CN119163441A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of tunnel construction, in particular to a construction method for a shield machine to push through a dark excavation and a secondary initial reaction force device. Background Art
[0002] Shield construction is a commonly used construction method in long-distance tunnel construction in relatively homogeneous strata except hard rock, and the tunnel burial depth and cover depth should not be less than 1D (tunnel diameter). When there is a dark excavation section of the tunnel, the commonly used method is to construct two lifting ports on both sides of the dark excavation section. The shield machine is lifted out from one lifting port and then transferred in from the other lifting port. The construction period is long, the utilization rate of large machinery is high, the safety hazards are great, and the construction cost is high.
[0003] Since the shield passing through the dark excavation section involves changes in operating conditions, it is necessary to start the shield twice in the dark excavation section. The conditions for the shield's secondary start are different from those at the start shaft. Therefore, the shield's empty push through the dark excavation section and the secondary start reaction device are a key research issue. Summary of the invention
[0004] The present invention aims to overcome the defects of the prior art and provide a construction method for a shield machine to push through a dark excavation and a secondary initial reaction force device, so as to solve the problem of a shield machine pushing through a dark excavation section and a secondary initial reaction force device.
[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: A construction method for shield empty pushing through dark excavation and secondary initial reaction force device, characterized in that it comprises the following steps: Step 1: After the construction of the dark-cut tunnel arch is completed, backfill is carried out according to the height of the plain concrete backfill layer, and then the arch wall of the dark-cut tunnel is constructed using a template trolley; Step 2: After the dark excavation tunnel construction is completed, the arc-shaped guide platform concrete with a height of 10000 is directly constructed at the receiving end and the starting end of the shield machine to be used as the receiving and starting bracket of the shield machine; Step 3: Before the shield machine exits the tunnel, install steel rails on the guide platform as guide rails according to the actual plane and elevation position of the shield machine, and push the shield machine onto the guide rails; Step 4: The shield body is pushed through the ground fissure to dig a tunnel in the dark by using a jack push mode; Step 5: After the shield machine pushes the tunnel through the dark excavation, the receiving end and the starting end are cleaned and the concrete guide platform is roughened, and a horse stool is made to lay the battery car track. The battery car track is installed on the backfill layer for the push part; Step six: Construction of the secondary initial reaction device.
[0006] The construction method for shield empty push through dark excavation and secondary initial reaction force device is characterized in that: the arc guide platform described in step 2 is constructed by: cleaning the residual slurry of the construction second lining invert and side wall, calculating the rail surface elevation and center coordinates of the arc guide platform through shield connection measurement and construction measurement in the tunnel, laying out and positioning the embedded parts on site, the embedded parts are made of Ф25 round steel with a length of , the upper thread is used for the pressure plate to fix the rail, and the lower part has a 90° hook length for anchoring; after the construction of the embedded parts is completed, the surveying personnel will meet to ensure that the center spacing of the two parallel embedded parts is equal; the embedded parts are directly anchored into the second lining invert concrete with Ф25 steel bars in the vertical direction, and connected and reinforced with Ф18 steel bars in the horizontal direction from the second lining invert concrete surface, and the connection and reinforcement spacing is; After the construction of the embedded parts is completed, the arc-shaped guide platform construction section will set up formwork on both sides according to the measured elevation, and add closing nets at the parts with larger slopes to facilitate concrete pouring. Pumped concrete is used for concrete pouring, and the surface is closed in time after the pouring is completed. After the pouring is completed, the top of the concrete embedded parts will be higher than the concrete surface. The rails will be placed in the middle of the embedded parts according to their buried positions, and the rails will be fixed to the formed concrete slope with track plates and nuts, providing conditions for the arrival and start of the shield machine.
[0007] The construction method for shield empty pushing through dark excavation and secondary initial reaction force device is characterized in that: the construction method of shield "tunneling" empty pushing through the station is: using dark excavation to backfill the concrete layer, installing rails on the concrete layer, reasonably arranging the spacing and number of rails according to the cross-sectional size of the dark excavation tunnel, smearing butter on the rails, and then placing the bracket, dragging the shield body on the bracket, during the empty pushing process, jacks are respectively placed on the tracks on both sides, and the jacks push the bracket and shield forward with the assistance of the rail clamp; At the same time, the construction of the ground fissure lining structure of the dark-excavated tunnel will be carried out after the shield construction is completed. During the dry pushing, horse stools will be installed at the ground fissures, and steel rails will be installed on the horse stools for dry pushing to ensure the continuous and smooth passage of the station bracket.
[0008] The construction method for shield empty pushing through dark excavation and secondary initial reaction force device is characterized in that: step six includes installing shield embedded parts: There are two main types of shield embedded parts: reaction frame embedded parts and demolition lifting lug embedded parts.
[0009] The construction method for shield empty pushing through dark excavation and secondary initial reaction force device is characterized in that the reaction frame embedded parts include a bottom steel plate and a steel bar groove arranged on the steel plate, and the inner angle of the groove is 90°.
[0010] The construction method for shield empty pushing through dark excavation and secondary initial reaction force device is characterized in that the demolition lifting ear embedded parts include a bottom steel plate and a steel bar groove arranged on the steel plate, and the inner angle of the groove is 90°.
[0011] The construction method for shield empty pushing through dark excavation and secondary initial reaction force device is characterized by: the reaction frame embedded parts are arranged in 2 sections, each section has 22 pieces buried, of which 6 pieces are buried in the invert arch, 16 pieces are buried in the arch wall, a total of 44 pieces, centered on the center of the shield circle, each piece is spaced 16° apart, the first section is buried according to the chord length, and the second section is arranged in space.
[0012] The construction method for shield empty pushing through dark excavation and secondary initial reaction force device is characterized by: a total of 8 sections are set for the negative ring removal lifting ear embedded parts, and 3 pieces are buried in each section above the negative ring segment and the reference ring position, totaling 24 pieces, centered on the shield circle center, arranged at a vault angle of 45°, and buried according to the chord length.
[0013] The beneficial effects of the present invention are as follows: It can be seen from the above technical scheme that the present application provides a construction method for shield empty push through dark excavation and secondary initial reaction force device, in order to solve the problem that the shield passes through the dark excavation section and the equipment does not need to be hoisted out and hoisted in for secondary turnover. The present invention constructs an arc guide platform concrete at the receiving and starting end of the dark excavation tunnel shield and uses it as a bracket, and at the same time, a guide rail is placed on the basis of concrete for shield excavation, and a reserved hole for installing the reaction force device is reserved on the guide rail, and a top push reaction force device is installed to assist the excavation of the shield.
[0014] The present invention solves the problem of the shield being pushed through the dark excavation section without lifting out and lifting in for secondary turnover. This patent uses arc-shaped guide platform concrete as a bracket at the receiving and starting ends of the dark excavation tunnel shield, and at the same time, guide rails are placed on the basis of concrete for shield excavation. Pre-reserved holes for installing reaction force devices are reserved on the guide rails, and a top-thrust reaction force device is installed to assist the excavation of the shield. It reduces the use of machinery, saves construction time and costs, improves construction efficiency, and ensures construction progress and safety during the construction process. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the arc guide platform; Figure 2 This is a schematic diagram of the embedded parts of the reaction frame; Figure 3 Schematic diagram of removing embedded parts for negative ring; Figure 4 This is a schematic diagram of the installation position of the embedded parts of the reaction frame; Figure 5 This is the cross-sectional view of the location of the embedded parts for the negative ring segment removal; Figure 6 Cross-sectional view of the installation position of the embedded parts for removing the reaction frame and negative ring. DETAILED DESCRIPTION
[0016] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection requested by the present application.
[0017] The total length of the shield machine and its supporting facilities in this project, including the length of the shield body, is such that when the shield machine is pushed through a dark tunnel without any support, the shield body can meet the requirements of pushing the shield machine through a dark tunnel without any support by utilizing the cooperation of the bracket, track, track clamp and jack. At the same time, when the shield machine is started for the second time, the reaction device can be used to start the secondary excavation construction of the shield machine. like Figure 1 As shown: A construction method for shield empty pushing through dark excavation and secondary initial reaction force device, which comprises the following steps: Step 1: After the construction of the dark-cut tunnel arch is completed, backfill is carried out according to the height of the plain concrete backfill layer, and then the arch wall of the dark-cut tunnel is constructed using a template trolley; Step 2: After the dark excavation tunnel construction is completed, the arc-shaped guide platform concrete with a height of 10000 is directly constructed at the receiving end and the starting end of the shield machine to be used as the receiving and starting bracket of the shield machine; Step 3: Before the shield machine exits the tunnel, install steel rails on the guide platform as guide rails according to the actual plane and elevation position of the shield machine, and push the shield machine onto the guide rails; Step 4: The shield body is pushed through the ground fissure to dig a tunnel in the dark by using a jack push mode; Step 5: After the shield machine pushes the tunnel through the dark excavation, the receiving end and the starting end are cleaned and the concrete guide platform is roughened, and a horse stool is made to lay the battery car track. The battery car track is installed on the backfill layer for the push part; Step six: Construction of the secondary initial reaction device.
[0018] 1. Arc guide platform construction: Clean up the residual slurry of the second lining invert and side wall during construction. Calculate the elevation and center coordinates of the arc guide rail surface through shield connection measurement and construction measurement in the tunnel. Lay out and locate the embedded parts on site. The embedded parts are made of Ф25 round steel with a length of . The upper thread is used to fix the rail with a pressure plate, and the lower part has a 90° hook for anchoring. After the construction of the embedded parts is completed, the surveyors will make sure that the center spacing of the two parallel embedded parts is equal. The embedded parts are directly anchored into the second lining invert concrete with Ф25 steel bars in the vertical direction, and connected and reinforced with Ф18 steel bars in the horizontal direction from the second lining invert concrete surface. The connection and reinforcement spacing is .
[0019] After the construction of the embedded parts is completed, the construction section of the arc-shaped guide platform sets up templates on both sides according to the measured elevation. Since the middle part of the guide platform is arc-shaped and it is difficult to pour it at one time, a closing net is added at the part with a larger slope to facilitate concrete pouring, speed up the construction progress, and avoid tedious processes such as setting up templates. Concrete pouring uses pumped concrete, and controlling the slump is an important part of this process. After pouring, the surface must be closed in time, especially at the position where the rails are laid. The surface must be flat. After pouring, the top of the concrete embedded part will be higher than the concrete surface. Put the rail in the middle of the embedded part according to the embedded position of the embedded part, and use the track plate and nut to fix the rail on the formed concrete slope to provide conditions for the arrival and start of the shield machine.
[0020] 2. Shield tunneling and empty push through station construction Use dark excavation to backfill the concrete layer, install rails on the concrete layer, and reasonably arrange the spacing and number of rails according to the cross-sectional size of the dark excavated tunnel. In this project, four rows of rails are arranged, two rows in the middle and one row on each side. Grease the rails, and then place the bracket with the shield dragged on it. During the empty push process, 100t jacks are placed on the tracks on both sides, and the jacks push the bracket and shield forward with the assistance of the track clamp.
[0021] At the same time, the construction of the ground fissure lining structure of the dark-excavated tunnel will be carried out after the shield construction is completed. During the dry pushing, horse stools will be installed at the ground fissures, and steel rails will be installed on the horse stools for dry pushing to ensure the continuous and smooth passage of the station bracket.
[0022] 3. Construction of the initial reaction device of the shield machine In order to remove the negative ring segments safely and smoothly in the dark-cut tunnel, when large-scale mechanical equipment cannot meet the requirements, embedded parts need to be installed in the lining of the dark-cut tunnel. The installation location and requirements are as follows: There are two main types of shield embedded parts: reaction frame embedded parts and demolition lifting lug embedded parts.
[0023] like Figure 2 As shown: The size of the steel plate of the embedded part of the reaction frame is ××, and Φ25 threaded steel is welded to the steel plate. The threaded steel is long and bent at 90°; like Figure 3 As shown: The size of the embedded lifting ear for demolition is ××, and it is welded with Φ25 threaded steel and steel plate. The threaded steel is long and bent at 90°.
[0024] like Figure 4 , 6 As shown: There are 2 sections of reaction frame embedded parts, each section has 22 pieces (6 pieces are buried in the inverted arch and 16 pieces are buried in the arch wall), a total of 44 pieces, with the center of the shield circle as the center, each piece is 16° apart, the first section can be referred to Figure 3The chord length is buried, and the second section is arranged in the space.
[0025] like Figure 5 , 6 As shown: There are 8 sections of embedded parts for negative ring removal lifting lugs. Above the negative ring segments and reference rings, 3 pieces are buried in each section, for a total of 24 pieces. They are arranged with the shield center as the center and the arch angle of 45°. The position can be referenced Figure 4 String length buried.
[0026] The above are only embodiments provided for the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A construction method for shield empty pushing through dark excavation and secondary initial reaction force device, characterized in that It includes the following steps: Step 1: After the construction of the dark-cut tunnel arch is completed, backfill is carried out according to the height of the plain concrete backfill layer, and then the arch wall of the dark-cut tunnel is constructed using a template trolley; Step 2: After the dark excavation tunnel construction is completed, the arc-shaped guide platform concrete with a height of 10000 is directly constructed at the receiving end and the starting end of the shield machine to be used as the receiving and starting bracket of the shield machine; Step 3: Before the shield machine exits the tunnel, install steel rails on the guide platform as guide rails according to the actual plane and elevation position of the shield machine, and push the shield machine onto the guide rails; Step 4: The shield body is pushed through the ground fissure to dig a tunnel in the dark by using a jack push mode; Step 5: After the shield machine pushes the tunnel through the dark excavation, the receiving end and the starting end are cleaned and the concrete guide platform is roughened, and a horse stool is made to lay the battery car track. The battery car track is installed on the backfill layer for the push part; Step six: Construction of the secondary initial reaction device.
2. A construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 1, characterized in that: The construction method of the arc guide platform described in step 2 is as follows: clean up the residual slurry of the second lining invert and the side wall during construction, calculate the rail surface elevation and center coordinates of the arc guide platform through shield connection measurement and construction measurement in the tunnel, and lay out the embedded parts on site. The embedded parts are made of Ф25 round steel with a length of , and the upper thread is used for the pressure plate to fix the rail, and the lower part has a 90° hook for anchoring; after the construction of the embedded parts is completed, the surveying personnel will meet to ensure that the center spacing of the two parallel embedded parts is equal; the embedded parts are directly anchored into the second lining invert concrete with Ф25 steel bars in the vertical direction, and connected and reinforced with Ф18 steel bars in the horizontal direction from the second lining invert concrete surface, and the connection and reinforcement spacing is; After the construction of the embedded parts is completed, the arc-shaped guide platform construction section will set up formwork on both sides according to the measured elevation, and add closing nets at the parts with larger slopes to facilitate concrete pouring. Pumped concrete is used for concrete pouring, and the surface is closed in time after the pouring is completed. After the pouring is completed, the top of the concrete embedded parts will be higher than the concrete surface. The rails will be placed in the middle of the embedded parts according to their buried positions, and the rails will be fixed to the formed concrete slope with track plates and nuts, providing conditions for the arrival and start of the shield machine.
3. A construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 1, characterized in that: The construction method of shield tunneling is as follows: backfill the concrete layer with dark excavation, install rails on the concrete layer, arrange the spacing and number of rails reasonably according to the cross-sectional size of the dark excavated tunnel, apply butter on the rails, and then place the bracket, on which the shield is dragged. During the empty push process, jacks are placed on the tracks on both sides, and the jacks push the bracket and shield forward with the assistance of the track clamps. At the same time, the construction of the ground fissure lining structure of the dark-excavated tunnel will be carried out after the shield construction is completed. During the dry pushing, horse stools will be installed at the ground fissures, and steel rails will be installed on the horse stools for dry pushing to ensure the continuous and smooth passage of the station bracket.
4. A construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 1, characterized in that: Step six includes installing the shield embedded parts: There are two main types of shield embedded parts: reaction frame embedded parts and demolition lifting lug embedded parts.
5. A construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 4, characterized in that: The reaction frame embedded part includes a bottom steel plate and a steel bar groove arranged on the steel plate, and the inner angle of the groove is 90°.
6. A construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 4, characterized in that: The demolition lifting lug embedded part comprises a bottom steel plate and a steel bar groove arranged on the steel plate, and the inner angle of the groove is 90°.
7. A construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 5, characterized in that: There are two sections of embedded reaction frame parts, with 22 pieces buried in each section, including 6 pieces buried in the invert arch and 16 pieces buried in the arch wall, totaling 44 pieces. With the center of the shield circle as the center, each piece is spaced 16° apart. The first section is buried according to the chord length, and the second section is arranged in gaps.
8. The construction method for shield tunneling through dark excavation and secondary initial reaction force device according to claim 6 is characterized in that: There are 8 sections of embedded parts for the negative ring removal lifting ears. Above the negative ring segments and the reference ring, 3 pieces are buried in each section, for a total of 24 pieces. They are arranged with the center of the shield circle at a 45° arch angle and buried according to the chord length.