Construction method for mid-partition wall of single-hole double-track tunnel

Abstract

The invention relates to a single-hole double-track tunnel mid-partition wall construction method, which is based on synchronous construction of tunnel shield, bow-shaped piece installation and flue plate installation, and comprises the following steps: S1, carrying out mid-partition wall position lofting in an area where a bow-shaped piece is installed behind a shield tunneling machine, and completing steel bar planting operation of a mid-partition wall; s2, a movable door type steel platform is used for binding reinforcing steel bars of the mid-partition wall along the embedded reinforcing steel bars on the bow-shaped piece; s3, top flue plates at the corresponding positions are installed synchronously by means of the movable door type steel platform, and steel bars at the corresponding positions of the top of the middle partition wall are connected with the flue plate embedded connectors; during shield tunneling construction, the movable door type steel platform and the steel mould trolley are synchronously used for construction of the mid-partition wall, and while transportation of a construction vehicle is not affected, concrete pouring of the mid-partition wall is conducted from the upper portion of the flue plate in a pumping mode, so that synchronous construction of the mid-partition wall and shield tunneling is completed; the purpose of improving the middle partition wall construction efficiency is achieved.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and specifically to a method for constructing a partition wall in a single-bore double-track tunnel. Background Technology

[0002] Currently, with the continuous advancement of urbanization, the development and utilization of underground space is showing a trend of large-scale development; ultra-large diameter and ultra-long distance shield tunnels have been widely used; single-bore double-track is a relatively new cross-sectional layout form that has emerged in long-distance rail transit tunnels in recent years, with advantages such as strong functional compliance, high space utilization, and good economic benefits.

[0003] The existing single-tunnel double-track cross-sectional layout is shown in the attached figure. Figure 5 As shown, in addition to the main body composed of segments 1 spliced ​​together, it mainly includes flue slabs 2 and bow-shaped components 3 located on the upper and lower sides inside the tunnel, respectively, and a central partition wall 4 structure located between the flue slabs 2 and bow-shaped components 3. The central partition wall is generally constructed after the bow-shaped components and flue slabs are installed. In the confined space of a tunnel, the erection and dismantling of its formwork are quite cumbersome, which undoubtedly leads to the problem of low construction efficiency of the central partition wall and cannot meet the needs of the coordinated construction of shield tunneling and the central partition wall. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for constructing the central partition wall in a single-tunnel double-track tunnel, thereby solving the problem of low construction efficiency of the central partition wall during the shield tunneling stage of a single-tunnel double-track tunnel in the prior art.

[0005] To achieve the above objectives, this invention provides a method for constructing a central partition wall in a single-tunnel double-track tunnel, based on the simultaneous construction of tunnel shield, bow-shaped component installation, and flue slab installation. The central partition wall construction method includes the following steps: S1. Lay out the location of the central partition wall in the area behind the tunnel boring machine where the bow-shaped components have been installed, and complete the rebar installation work for the central partition wall. S2. Use a movable portal steel platform to tie the reinforcing bars of the central partition wall along the pre-embedded reinforcing bars on the arch-shaped member; S3. Simultaneously, use a movable gantry steel platform to install the top flue plate at the corresponding position, and connect the steel bars at the corresponding position of the top of the middle partition wall to the pre-embedded connector of the flue plate. S4. Steel formwork trolleys with reserved construction vehicle transport channels are set up on both sides of the design position of the central partition wall. The steel formwork on the two steel formwork trolleys work together to seal the outside of the central partition wall with the tied steel bars. S5. Concrete trucks enter through the vehicle transport lane and use on-board pumps to deliver concrete to the top of the flue slab for pouring the central partition wall.

[0006] By adopting this technical solution, during shield tunneling, a movable gantry steel platform and steel formwork trolley are used simultaneously for the binding and sealing of the central partition wall reinforcement. Without affecting the transportation of construction vehicles, the concrete of the central partition wall is poured using a pumping method on the flue slab and above it, so as to complete the synchronous construction of the central partition wall and shield tunneling, thereby improving the construction efficiency of the central partition wall and effectively improving the overall construction efficiency of long-distance single-tunnel double-track tunnels.

[0007] Furthermore, the rebar installation operation in step S1 is carried out simultaneously with the tunnel boring machine excavation.

[0008] This technical solution provides the prerequisite for the simultaneous construction of the central partition wall and the tunnel boring machine.

[0009] Furthermore, step S2 includes installing steel rails on the arch-shaped members on both sides of the designed location of the central partition wall, and using the steel rails and a movable portal steel platform to tie the reinforcing bars of the central partition wall along the pre-embedded reinforcing bars on the arch-shaped members.

[0010] By adopting this technical solution, the installation of the necessary structural steel rails for the tunnel can be completed directly. At the same time, the steel rails provide installation positions and movement guidance for the use of movable gantry steel platforms and steel formwork trolleys, achieving a complementary effect and improving construction efficiency.

[0011] Furthermore, in step S4, the steel mold trolley is movably mounted on the steel rail via a traveling mechanism. The traveling mechanism has a lifting cylinder that can drive the steel mold trolley to rise and fall. The steel mold trolley has a set of hydraulic cylinders that can drive the steel template used for sealing to move laterally.

[0012] By adopting this technical solution, the walking mechanism enables the steel formwork trolley to move actively on the rails; the lifting cylinder and cylinder group enable the steel formwork to move laterally and lift simultaneously, adapting to the adjustment of the steel formwork support position, so as to ensure the sealing effect and positional accuracy.

[0013] Furthermore, the bottom of the steel mold trolley in step S4 has jacks, which can directly support the bow-shaped component to allow the traveling mechanism to detach from the rails.

[0014] By adopting this technical solution, after the jack supports the bow-shaped component and the traveling mechanism is separated from the rail, the steel mold trolley can be kept in a stable state relative to the bow-shaped component, so as to avoid demolding problems caused by the movement of the traveling mechanism relative to the rail.

[0015] Furthermore, in step S3, the flue plate is pre-drilled with reserved holes for the construction of the middle partition wall after the flue plate is installed. The reserved holes include perforations opened on the side of the flue plate for concrete truck pumping pipes to pass through, and grouting holes opened in the middle of the flue plate for pouring the central partition wall from above.

[0016] By adopting this technical solution, after the concrete trucks enter, the concrete pumping pipes of the concrete trucks can pass through the perforation to the top of the flue plate, and then extend to the pouring hole to pour concrete into the central partition wall, ensuring the feasibility and reliability of pouring concrete into the central partition wall above the flue plate.

[0017] Furthermore, in step S4, the surface of the steel template has a stainless steel surface layer.

[0018] By adopting this technical solution, the flatness of the surface of the partition wall formed by steel formwork can be increased, and the difficulty of demolding the steel formwork from the surface of the formed partition wall can also be reduced.

[0019] Furthermore, in step S4, bolt holes are pre-drilled on the steel template, and pre-embedded channels are connected to its surface by connecting bolts used in conjunction with it.

[0020] By adopting this technical solution, after the central partition wall is poured with concrete and solidified, the pre-embedded channel can be pre-embedded inside the central partition wall, which facilitates the later installation of components on the surface of the central partition wall using the pre-embedded channel.

[0021] Compared with the prior art, the present invention has the following advantages: During shield tunneling, a movable gantry steel platform and steel formwork trolley are used simultaneously for the binding of the reinforcing steel bars and the sealing of the formwork for the central partition wall. Without affecting the transportation of construction vehicles, the concrete for the central partition wall is poured using a pumping method on the flue slab above it, so as to complete the synchronous construction of the central partition wall and the shield tunneling, thereby improving the construction efficiency of the central partition wall and effectively improving the overall construction efficiency and quality of long-distance single-tunnel double-track tunnels. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the construction method for the partition wall in a single-bore double-track tunnel according to the present invention; Figure 2 This is a schematic diagram of the cross-sectional layout of the construction process of the partition wall construction method in a single-tube double-track tunnel according to the present invention. Figure 3 This is a schematic diagram of the longitudinal section layout of the construction process of the partition wall construction method in a single-tube double-track tunnel according to the present invention; Figure 4 This is a schematic diagram of the pre-embedded channel in the construction method of the partition wall in a single-tube double-track tunnel of the present invention; Figure 5 This is a schematic diagram of the existing single-tunnel double-track cross-sectional layout.

[0023] Explanation of reference numerals in the attached drawings: 1. Segment; 2. Flue plate; 3. Bow-shaped component; 4. Central partition wall; 111. Rail; 112. Steel formwork trolley; 113. First hydraulic cylinder; 114. Second hydraulic cylinder; 115. Steel formwork; 116. Traveling mechanism; 117. Lifting hydraulic cylinder; 118. Jack; 120. Bolt hole; 121. Connecting bolt; 122. Embedded channel; 21. Through hole; 22. Grouting hole. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Please see the appendix Figure 1 This invention provides a method for constructing a central partition wall in a single-tunnel double-track tunnel. Based on the simultaneous construction of the tunnel shield (including segment assembly), the installation of the arch-shaped components 3, and the installation of the flue slab 2, the central partition wall construction method includes the following steps: S1. While the tunnel boring machine (TBM) is excavating, the position of the central partition wall 4 is laid out in the area behind the TBM where the arch-shaped components 3 have been installed, and the rebar installation work for the central partition wall 4 is completed on the corresponding arch-shaped components 3 after the layout; S2. A movable portal steel platform is used to tie the rebar of the central partition wall 4 along the already implanted rebars on the arch-shaped components 3; S3. Simultaneously... Step 1: Install the top flue plate 2 at the corresponding position using a movable portal steel platform, and connect the steel bars at the corresponding position of the top of the partition wall 4 to the pre-embedded connector of the flue plate 2; Step 2: Set up steel formwork trolleys 112 with reserved construction vehicle transportation channels on both sides of the designed position of the partition wall 4, and the steel formwork 115 on the two steel formwork trolleys 112 cooperate with each other to seal the outside of the already tied steel bars of the partition wall 4; Step 3: Concrete trucks drive in through the vehicle transportation channel and use the truck-mounted pump to transport concrete to the top of the flue plate 2 for pouring the partition wall 4; During shield tunneling, a movable gantry steel platform and steel formwork trolley 112 are used simultaneously to tie the reinforcing bars and seal the formwork of the central partition wall 4. While not affecting the transportation of construction vehicles, the concrete of the central partition wall 4 is poured using the flue slab 2 via pumping, so as to complete the synchronous construction of the central partition wall 4 and the shield tunneling, thereby improving the construction efficiency of the central partition wall 4 and effectively improving the overall construction efficiency of long-distance single-tunnel double-track tunnels.

[0026] It should be noted that the conventional installation of flue plate 2 is completed by a special forklift. When the movable gantry steel platform and the special forklift are working in the same work area, in addition to using the movable gantry steel platform for the construction of the middle partition wall 4, the movable gantry steel platform can be used to manually assist the installation of flue plate 2 under the action of the special forklift, so as to achieve the purpose of simultaneous construction of flue plate 2 and middle partition wall 4 and improve construction safety. When the movable gantry steel platform and the special forklift equipment are not operating in the same work area, the movable gantry steel platform should be in the work area before the work area of ​​the special forklift equipment. While the special forklift equipment is installing the flue plate 2 in its work area, the movable gantry steel platform is used to construct the middle partition wall 4 in the work area after the flue plate 2 has been installed, so as to achieve the purpose of synchronous construction of flue plate 2 and middle partition wall 4. Furthermore, in order to improve the connection strength between the subsequent forming of the partition wall 4 and the flue plate 2, the top position of the corresponding partition wall 4 can be roughened by using a movable portal steel platform after the flue plate 2 is installed.

[0027] Step S2 includes installing steel rails 111 on the bow-shaped members 3 on both sides of the designed position of the central partition wall 4, and using the steel rails 111 to tie the reinforcing bars of the central partition wall 4 along the pre-embedded reinforcing bars on the bow-shaped members 3 using a movable gantry steel platform; this can directly complete the installation of the necessary tunnel structure steel rails 111, while the steel rails 111 provide installation positions and movement guidance for the use of the movable gantry steel platform and the steel formwork trolley 112, achieving the effect of complementing each other and improving construction efficiency.

[0028] Please see the appendix Figure 2 In step S3, the flue plate 2 is pre-drilled with reserved holes for the construction of the middle partition wall 4 after installation. The reserved holes include a through hole 21 opened on the side of the flue plate 2 for the concrete truck pumping pipe to pass through, and a grouting hole 22 opened in the middle of the flue plate 2 for pouring the middle partition wall 2 from above. After the concrete truck enters, the concrete pumping pipe of the concrete truck can pass through the through hole 21 to the top of the flue plate 2, and then extend to the grouting hole 22 to pour concrete into the middle partition wall 4, ensuring the feasibility and reliability of pouring concrete into the middle partition wall 4 from above the flue plate 2. Furthermore, to make it easier to retract the concrete pumping pipe of the concrete truck, the perforation 21 used to pass through the concrete pumping pipe is set to an inverted cone shape; and to accommodate the size of the standard concrete pumping pipe, its upper diameter is set to 180mm and its lower diameter is set to 150mm; correspondingly, the diameter of the grouting hole 22 only needs to be sufficient to allow the concrete pumping pipe to be inserted, and it is set to the same 150mm as the lower diameter of the perforation 21. Furthermore, in order to ensure the uniformity of concrete pouring for the central partition wall 4, the grouting holes 22 on the flue plate 2 are set at intervals of 1m; and in order to reduce the number of concrete pumping pipe installation operations, the perforations 21 for the concrete pumping pipes are set at intervals of 40m. With the perforation 21 as the center, within a radius of 20m, different grouting holes 22 are selected for pouring the central partition wall 4, and only the concrete pumping pipe inserted through the perforation 21 needs to be swung.

[0029] Please see the appendix Figure 2-3 In step S4, the steel mold trolley 112 is movably mounted on the steel rail 111 via the traveling mechanism 116, enabling the steel mold trolley 112 to move actively on the steel rail 111. The traveling mechanism 116 has a lifting cylinder 117 that can drive the steel mold trolley 112 to rise and fall. The steel mold trolley 112 has a cylinder group that can drive the steel template 115 used for sealing to move laterally. The setting of the lifting cylinder 117 and the cylinder group enables the steel template 115 to have both lateral movement and lifting capabilities, which can adapt to the adjustment of the support position of the steel template 115, so as to ensure the sealing effect and positional accuracy. Furthermore, the traveling mechanism 116 is a conventional track-traveling structure, such as a conventional combination structure of rail wheels that cooperate with the rail 111 and a motor that drives the rail wheels to rotate. Furthermore, the hydraulic cylinder assembly includes a first hydraulic cylinder 113 installed on the top of the steel mold trolley 112 and a second hydraulic cylinder 114 installed on the lower side of the steel mold trolley 112. The extended ends of the first hydraulic cylinder 113 and the second hydraulic cylinder 114 are respectively connected to the upper and lower sides of the steel template 115, and the steel template 115 is driven to move laterally relative to the steel mold trolley 112 synchronously through the first hydraulic cylinder 113 and the second hydraulic cylinder 114. Furthermore, in order to reduce the use of drive structures, the steel mold trolley 112 can be connected to the movable gantry steel platform and share a set of drive structures; for example, the movement of the steel mold trolley 112 and the movable gantry steel platform can be achieved by using only the walking mechanism 116 at the bottom of the steel mold trolley 112.

[0030] Please see the appendix Figure 3 In step S4, the bottom of the steel mold trolley 112 has a jack 118, which can directly support the bow-shaped component 3 to make the traveling mechanism 116 separate from the steel rail 111. After the jack 118 supports the bow-shaped component 3 to make the traveling mechanism 116 separate from the steel rail 111, the steel mold trolley 112 can be in a stable state relative to the bow-shaped component 3, so as to avoid demolding problems caused by the movement of the traveling mechanism 116 relative to the steel rail 111.

[0031] In order to increase the flatness of the surface of the partition wall 4 formed by the steel formwork 115 and casting, and at the same time reduce the difficulty of demolding the steel formwork 115 from the surface of the formed partition wall 4, the surface of the steel formwork 115 is set as a stainless steel surface layer.

[0032] Please see the appendix Figure 3-4In step S4, the steel template 115 has pre-drilled bolt holes 120, and the pre-embedded channel 122 is connected to the surface of the steel template 115 by the matching connecting bolts 121. After the concrete of the partition wall 4 is poured and solidified, the pre-embedded channel 122 can be pre-embedded into the interior of the partition wall 4, which facilitates the later installation of components on the surface of the partition wall 4 using the pre-embedded channel 122. Furthermore, the embedded channel 122 has a C-shaped groove on the side facing the steel formwork 115. The C-shaped groove can limit the movement of the head of the connecting bolt 121. When the steel formwork 115 is removed after the central partition wall 4 is solidified, the nut on the connecting bolt 121 itself can be unscrewed to separate it from the steel formwork 115, so that the embedded channel 122 remains inside the central partition wall 4 for the installation of other components on the central partition wall 4 in the future. Furthermore, in order to ensure the sealing between the pre-embedded channel 122 and the steel formwork 115 during the concrete pouring of the central partition wall 4, and to prevent grout leakage during the pouring process, geotextile can also be sandwiched between the contact surfaces of the pre-embedded channel 122 and the steel formwork 115.

[0033] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A method for constructing a partition wall in a single-bore double-track tunnel, based on the simultaneous construction of tunnel shield, bow-shaped component installation, and flue slab installation, characterized in that, The construction method for the central partition wall includes the following steps: S1. Lay out the location of the central partition wall in the area behind the tunnel boring machine where the bow-shaped components have been installed, and complete the rebar installation work for the central partition wall. S2. Use a movable portal steel platform to tie the reinforcing bars of the central partition wall along the pre-embedded reinforcing bars on the arch-shaped member; S3. Simultaneously, use a movable gantry steel platform to install the top flue plate at the corresponding position, and connect the steel bars at the corresponding position of the top of the middle partition wall to the pre-embedded connector of the flue plate. S4. Steel formwork trolleys with reserved construction vehicle transport channels are set up on both sides of the design position of the central partition wall. The steel formwork on the two steel formwork trolleys work together to seal the outside of the central partition wall with the tied steel bars. S5. Concrete trucks enter through the vehicle transport lane and use on-board pumps to deliver concrete to the top of the flue slab for pouring the central partition wall.

2. The method for constructing a partition wall in a single-bore double-track tunnel according to claim 1, characterized in that, The rebar installation in step S1 is carried out simultaneously with the tunnel boring machine excavation.

3. The method for constructing a partition wall in a single-bore double-track tunnel according to claim 1, characterized in that, Step S2 includes installing steel rails on the arch-shaped members on both sides of the designed location of the central partition wall, and using the steel rails and a movable portal steel platform to tie the reinforcing bars of the central partition wall along the pre-embedded reinforcing bars on the arch-shaped members.

4. The method for constructing the partition wall in a single-bore double-track tunnel according to claim 3, characterized in that, In step S4, the steel mold trolley is movably mounted on the steel rail via a traveling mechanism. The traveling mechanism has a function to drive the steel mold trolley to rise and fall. The steel mold trolley has a set of hydraulic cylinders that can drive the steel template used for sealing to move laterally.

5. The method for constructing a partition wall in a single-bore double-track tunnel according to claim 4, characterized in that, The bottom of the steel mold trolley in step S4 is equipped with jacks, which can directly support the bow-shaped component to allow the traveling mechanism to detach from the rails.

6. The method for constructing a partition wall in a single-bore double-track tunnel according to claim 1, characterized in that, In step S3, the flue plate has reserved holes for the construction of the middle partition wall after the flue plate is installed; The reserved holes include perforations opened on the side of the flue plate for concrete truck pumping pipes to pass through, and grouting holes opened in the middle of the flue plate for pouring the central partition wall from above.

7. The method for constructing a partition wall in a single-bore double-track tunnel according to claim 1, characterized in that, In step S4, the surface of the steel template has a stainless steel surface layer.

8. The method for constructing a partition wall in a single-bore double-track tunnel according to claim 1, characterized in that, In step S4, bolt holes are pre-drilled on the steel template, and pre-embedded channels are connected to its surface by matching connecting bolts.

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