Construction method for comprehensive transportation hub transfer passage encountering box culvert protection

Abstract

The application discloses a construction method for protecting a box culvert of a transfer channel of a comprehensive traffic hub, and the construction method comprises the following steps: supporting construction of a transfer channel second-stage foundation pit, reinforcing soil bodies on two sides below a sand layer at the bottom of the transfer channel second-stage foundation pit and a drainage box culvert, protection construction of the drainage box culvert, earthwork excavation, transfer channel second-stage construction, enclosure construction of a transfer channel first-stage and second-stage interface, excavation construction of the transfer channel first-stage and second-stage interface, and transfer channel first-stage and second-stage interface construction. The construction method of the application reinforces the soil bodies on two sides below the sand layer at the bottom of the transfer channel second-stage foundation pit and the drainage box culvert, suspends a suspending rod on a first concrete foundation pit horizontal inner support, protects the drainage box culvert by using the suspending rod, horizontally arranges a protection channel steel on a second concrete foundation pit horizontal inner support, and passes the protection channel steel through the bottom of the drainage box culvert, so that the protection channel steel supports the drainage box culvert, and the drainage box culvert can be prevented from sinking during the earthwork excavation. The construction method of the application solves the problem that the sand layer of the transfer channel second-stage foundation pit is difficult to reinforce.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of traffic hub interchange construction, in particular to a construction method for protecting an interchange passage of a comprehensive traffic hub from a box culvert. BACKGROUND

[0002] With the continuous expansion of the scale of subway construction, various municipal pipelines and underground obstacles will be encountered during the construction of a subway station. For example, during the construction of an interchange passage of a traffic hub, a box culvert will be encountered. The existing construction method for the interchange passage is generally as follows: the interchange passage is constructed in three stages. During the drilling and grouting of the interchange passage in the first stage, water and sand will gush out, which will affect the grouting and the construction of the first stage. The interchange passage in the second stage is constructed by the open excavation method, and the excavation depth of the interchange passage in the second stage is about 10 m. The base is mainly located in the gravel sand layer. The construction of the enclosure structure of the interchange passage in the second stage is usually carried out by the "bored pile + internal support" method. Since there is a long rectangular rainwater box culvert about 0.7 m below the ground of the interchange passage in the second stage, the rainwater box culvert crosses the interchange passage in the second stage, and the bored pile construction cannot be carried out, which affects the construction of the enclosure structure of the interchange passage in the second stage. During the operation of the subway station, these box culverts cannot be interrupted, especially the rainwater box culverts related to flood prevention and drainage, which cannot be interrupted. Therefore, there is an urgent need to provide a construction method for solving the problem that the interchange passage of a traffic hub crosses a rainwater box culvert and the bottom of the foundation pit is a sand layer. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a construction method for solving the problem that the interchange passage of a traffic hub crosses a rainwater box culvert and the bottom of the foundation pit is a sand layer.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] A construction method for protecting an interchange passage of a comprehensive traffic hub from a box culvert, the interchange passage in the first stage and the interchange passage in the second stage are implemented through the construction method, and the construction method comprises the following processes:

[0006] Step 1) Construction of the support of the interchange passage in the second stage: the rainwater box culvert crosses the interchange passage in the second stage. The two sides of the interchange passage in the second stage are adjacent to the station passage and the interchange passage in the first stage, respectively. Drilled piles and double-pipe rotary piles are constructed on the other two sides of the interchange passage in the second stage, respectively. The drilled piles and the double-pipe rotary piles pass through the sand layer at the bottom of the interchange passage in the second stage.

[0007] Step 2) Reinforcement Construction: The soil on both sides of the drainage box culvert is reinforced near the bored cast-in-place piles. The bottom sand layer of the transfer channel phase II foundation pit and the soil on both sides of the drainage box culvert are reinforced. The soil reinforcement is carried out in three steps. The first reinforcement: First, vertical holes are drilled from the original ground and grouting is performed to reinforce the bottom sand layer of the transfer channel phase II foundation pit and stabilize the base soil. The second reinforcement: holes are drilled from the direction of the adjacent transfer channel phase I. Steel flower pipes are used to grout the holes to stabilize the soil under the drainage box culvert. The third reinforcement: holes are opened between the bored cast-in-place piles on both sides for anchoring. The holes are drilled obliquely and hollow anchor rods are used for oblique drilling and grouting.

[0008] Step 3) Drainage culvert protection construction: a concave waterstop steel plate is manufactured, and angle steel U-shaped clips are welded on both sides of the waterstop steel plate. The waterstop steel plate is fixed to the side wall of the drainage culvert via the angle steel U-shaped clips on both sides. After the waterstop steel plate is installed and fixed, a brick wall is built to seal the two ends of the drainage culvert. Excavation of earth on both sides of the drainage culvert is carried out simultaneously. A suspension rod is set on the horizontal inner support of the first concrete foundation pit. The drainage culvert is lifted by the suspension rod to protect the drainage culvert. A protective channel steel is horizontally placed on the horizontal inner support of the second concrete foundation pit. The protective channel steel passes through the bottom of the drainage culvert and supports the drainage culvert.

[0009] Step 4) Continue excavation of the drainage box culvert bottom and construction of the second phase of the transfer channel;

[0010] Step 5) Enclosure Construction at the Transfer Channel Phase I and II Connection Port: The power pipeline relocation, retaining wall, and temporary enclosure structure for the Transfer Channel Phases I and II were all constructed at night. The enclosure structure includes an enclosure foundation, enclosure panels, and enclosure fixtures. The upper end of the enclosure foundation is formed with a deep groove, and the bottom of the enclosure panel is formed with enclosure feet. The enclosure feet at the bottom of the enclosure panel are embedded in the deep groove and fixed with enclosure fixtures. The deep groove of the enclosure foundation is then filled with mortar.

[0011] Step 6) Excavation and construction of the transfer channel phase 1 and phase 2 docking port: demolish the side walls, and demolish the transfer channel phase 1 and phase 2 separately;

[0012] Step 7) Construction of the connecting entrances of the transfer channel Phases 1 and 2.

[0013] Step 8) The first and second phases of the transfer channel are completed.

[0014] Further, in step 2), the third reinforcement of the soil on both sides of the drainage box culvert adopts hollow anchor rod grouting and cast-in-place pile connected by bored pile, the soil on both sides of the drainage box culvert is excavated from top to bottom, and hollow anchor rod grouting is immediately adopted to reinforce the soil in a plum blossom type after each layer is excavated, then the steel mesh is hung on the hollow anchor rod, the slurry is sprayed on the steel mesh, and then several layers of horizontal grid steel frames are installed, and finally the concrete is sprayed to form the cast-in-place pile.

[0015] Further, the cast-in-place pile is connected with the cast-in-place pile, the cast-in-place pile is drilled to expose the steel bars, and the exposed steel bars are connected with the steel bars of the cast-in-place pile by welding.

[0016] Further, the several layers of horizontal grid steel frames are placed layer by layer from the bottom of the interchange passage to the bottom of the drainage box culvert, and the several layers of horizontal grid steel frames are connected into an integrated structure by longitudinal connecting ribs, and the horizontal spacing between adjacent two layers of horizontal grid steel frames is 1m.

[0017] Further, each layer of horizontal grid steel frame includes four support main bars and a plurality of ring-shaped hoops, the plurality of ring-shaped hoops are uniformly distributed on the four support main bars in a longitudinal direction, each ring-shaped hoop surrounds the outer periphery of the four support main bars and is welded thereto, and the four support main bars are connected by the plurality of ring-shaped hoops to form the horizontal grid steel frame.

[0018] Further, in step 1), the pile body of the cast-in-place pile is pre-buried with a steel ring, the height of the steel ring is from the bottom of the drainage box culvert to the bottom of the interchange passage, a plurality of layers of vertical steel plates are welded on the steel ring, two support main bars of the horizontal grid steel frame are welded with the vertical steel plates, and five steel ring anchor bars are fixed on the steel ring in a vertical direction, the five steel ring anchor bars are arranged in a radial manner, and the steel ring anchor bars are anchored into the pile body of the cast-in-place pile.

[0019] Further, in step 3), the 10KV power pipe above the drainage box culvert is suspended and protected by a suspension structure, a suspension point is provided every 1m on the wall surface, an expansion bolt is fixed at the suspension point, the suspension structure includes a sleeve, a lifting rope and a basket bolt, the sleeve is wrapped on the outer surface of the 10KV power pipe, one end of the lifting rope is sleeved with the sleeve wrapped with the 10KV power pipe, the other end of the lifting rope is connected with one end of the basket bolt, and the other end of the basket bolt is fixed to the suspension point by the expansion bolt.

[0020] Further, in step 5), the enclosing plate includes an outer light steel plate, an inner light steel plate and sound insulation cotton arranged from outside to inside, the sound insulation cotton is clamped between the outer light steel plate and the inner light steel plate, and the enclosing foundation is poured with C20 concrete.

[0021] Further, in step 6), the excavation tool of the transfer channel one-two period interface includes:

[0022] Step 61) The transfer channel is excavated first, and after the side wall of the three steel support positions is removed, the temporary first vertical steel support, the second vertical steel support and the third vertical steel support are erected.

[0023] Step 62) The remaining part of the main body side wall of the transfer channel is excavated, and the main body side wall is excavated in blocks, excavated from top to bottom in the order of transfer channel one period→ transfer channel two period, and excavated by using water drill + rope saw, that is, drilling holes in the four corners of each small block first, and then cutting and pulling out after using the rope saw, the size of each block is 1m×0.82m.

[0024] Further, in step 7), the specific construction process of the transfer channel one-two period interface construction includes:

[0025] Step 71) Construction of the hidden column;

[0026] Step 72) Construction of the transfer channel one period pouring concrete beam;

[0027] Step 73) Setting the temporary steel support under the transfer channel one period concrete beam;

[0028] Step 74) Removing the first vertical steel support, the second vertical steel support and the third vertical steel support;

[0029] Step 75) Construction of the transfer channel two period pouring concrete beam.

[0030] Step 76) Removing the temporary steel support, restoring the original decoration, removing the water retaining wall and the enclosure structure, waterproofing the transfer channel two period foundation pit interface, pre-burying the grouting guide pipe in the transfer channel two period foundation pit interface bottom plate for grouting reinforcement, and ensuring that the joint is embedded with a sealing continuous waterproof wall.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The construction method of the application comprises the following steps: supporting construction of a transfer passage second-stage foundation pit, reinforcing construction of sand layers at the bottom of the transfer passage second-stage foundation pit and soil bodies on both sides of the drainage box culvert, protection construction of the drainage box culvert, earth excavation, transfer passage second-stage construction, enclosure construction of a transfer passage first-stage and second-stage interface, excavation construction of the transfer passage first-stage and second-stage interface, transfer passage first-stage and second-stage interface construction, and through transfer passage construction. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 FIG. 1 is a flowchart of the construction method of the application for protecting the drainage box culvert of the transfer passage of the comprehensive traffic hub;

[0034] Figure 2 FIG. 2 is a plan layout of the transfer passage of the comprehensive traffic hub of the application;

[0035] Figure 3 FIG. 3 is a plan layout of the transfer passage second-stage enclosure reinforcement of the application;

[0036] Figure 4 FIG. 4 is a plan layout of the transfer passage second-stage foundation pit of the application using a suspension rod to protect the drainage box culvert;

[0037] Figure 5 FIG. 5 is a plan layout of the soil body reinforcement of the transfer passage second-stage foundation pit of the application;

[0038] Figure 6 FIG. 6 is a sectional view of the first hole drilling and grouting reinforcement of the application; Figure 5

[0039] Figure 7 FIG. 7 is a plan layout of the first hole drilling and grouting reinforcement of the application;

[0040] Figure 8 FIG. 8 is a sectional view of the first hole drilling and grouting reinforcement of the application;

[0041] Figure 9 FIG. 9 is a plan layout of the hole drilling from the transfer passage first-stage direction of the application;

[0042] Figure 10 FIG. 10 is a plan layout of the box culvert bottom hole drilling and grouting of the application;

[0043] Figure 11 FIG. 11 is a sectional view of the drainage box culvert bottom hole drilling and grouting of the application;​

[0044] Figure 12 This is a large-scale drawing of the end plugging of the drainage box culvert of the present invention;

[0045] Figure 13 This is a plan view of the present invention using a suspension structure to suspend and protect the power pipe;

[0046] Figure 14 This is a plan view of the horizontal grid steel frame installed inside the foundation pit of the present invention;

[0047] Figure 15 It is a relationship diagram of the connection between the horizontal grid steel frame and the horizontal grid steel frame of the present invention;

[0048] Figure 16 It is a structural schematic diagram of the horizontal grid steel frame of the present invention;

[0049] Figure 17 This is a large-scale drawing of the embedded steel ring of the bored pile of the present invention;

[0050] Figure 18 This invention Figure 17 Sectional view of section 2-2;

[0051] Figure 19 This is a plan view of the connecting port of the first and second phases of the transfer channel of the present invention;

[0052] Figure 20 is a cross-sectional view of the enclosure structure of the present invention;

[0053] Figure 21 It is a structural schematic diagram of the shielding plate of the present invention;

[0054] Figure 22 It is a plan view of the present invention with the side wall removed;

[0055] Figure 23 It is an elevation view of the connection point location of the transfer channel phases one and two of the present invention.

[0056] Figure: Transfer channel phase II foundation pit 1, bored cast-in-place piles 11, steel rings 111, steel plates 112, steel ring anchor bars 113, double-tube jet grouting piles 12, first concrete foundation pit horizontal internal support 13, second concrete foundation pit horizontal internal support 14, subway station 2, transfer channel phase I 21, subway station entrance and exit 23, subway station passageway entrance 24, soil reinforcement 3, drilled holes 31, hollow anchor rods 32, concrete retaining wall 33, horizontal grid steel frame 34, main support bars 341, annular ring bars 342, oblique reinforcement bars 343, longitudinal connecting bars 35, connecting steel bars 36, waterstop steel plates 37, angle steel U-shaped clips 371, steel pipes 38, brick wall 39. Suspension rod 4. Protection channel steel 5. Retaining wall 6. Enclosure structure 7. Enclosure foundation 71. Deep groove 711. Enclosure plate 72. Enclosure foot 721. Outer lightweight steel plate 722. Inner lightweight steel plate 723. Sound insulation cotton 724. Enclosure fixings 73. Concealed column 8. Transfer passage phase I cast concrete beam 81. Temporary steel support 82. First vertical steel support 83. Second vertical steel support 84. Third vertical steel support 85. Transfer passage phase II cast concrete beam 86. Drainage culvert 9. 10KV power pipe 10. Suspension structure 101. Lifting rope 1011. Turnbuckle bolt 1012. Expansion bolt 1013. Water supply pipe 102. DETAILED DESCRIPTION

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings, which form a part of this specification and illustrate the principles of the present invention through examples. Other aspects, features and advantages of the present invention will become apparent from this detailed description. In the accompanying drawings, the same or similar parts are represented by the same reference numerals in different figures.

[0058] like Figures 1-19 As shown, the first embodiment of the present invention provides a construction method for protecting a transfer channel of a comprehensive transportation hub from a box culvert. The transfer channel of the comprehensive transportation hub is divided into a first transfer channel 21 and a second transfer channel. The first transfer channel 21 is connected to the entrance and exit 23 of the subway station. The foundation pit of the first transfer channel 21 is 7.8m to 33.6m wide and 10.74m deep. The base is mainly located in a medium-coarse sand layer. The construction method includes the following steps:

[0059] Step 1) The construction of the first phase of the second phase of the transfer passage foundation pit 1: the first phase of the second phase of the transfer passage foundation pit 1 is a rectangle, the first phase of the second phase of the transfer passage foundation pit 1 and the station main interface 21 adopt the open excavation method, there is a north-south drainage box culvert 9 in the first phase of the second phase of the transfer passage foundation pit 1, the drainage box culvert 9 crosses the first phase of the second phase of the transfer passage foundation pit 1, the two sides of the first phase of the second phase of the transfer passage foundation pit 1 are adjacent to the subway station passage 24 and the first phase of the transfer passage 21, after the completion of the underground continuous wall construction of the foundation pit support of the first phase of the transfer passage 21, the other two sides of the first phase of the second phase of the transfer passage foundation pit 1 are respectively constructed with a bored pile 11 and a double-pipe rotary jet pile 12, the bored pile 11 and the double-pipe rotary jet pile 12 pass through the sand layer at the bottom of the first phase of the second phase of the transfer passage foundation pit 1; in the specific implementation, the drainage box culvert 9 is a box-shaped concrete, the outer diameter of the drainage box culvert 9 is 3.1m*2.6m, the bottom elevation of the drainage box culvert 9 is 0.35m above the top plate of the transfer passage main body, there are two pipelines above the drainage box culvert 9, which are a 10KV power pipe 10 and a φ300mm water supply pipe 102, the φ300mm water supply pipe 102 is located on one side of the 10KV power pipe 10, the first phase of the second phase of the transfer passage foundation pit 1 is 8.5m long and 9.4m wide, and the net height is 3.4m, because the drainage box culvert 9 crosses the first phase of the second phase of the transfer passage foundation pit 1, the bored piles 11 cannot be continuously arranged, and the bored piles 11 and the double-pipe rotary jet piles 12 need to be constructed respectively, the diameter of the bored piles 11 is 1000mm, the diameter of the double-pipe rotary jet piles 12 is 600mm, and the pile spacing is 450mm, and the double-pipe rotary jet piles stop water from entering the impermeable layer 1.0m;

[0060] Step 2) Reinforcement construction: the soil on both sides of the drainage box culvert 9 is reinforced by the bored piles 11, the sand layer at the bottom of the first phase of the second phase of the transfer passage foundation pit 1 and the soil on both sides of the drainage box culvert 9 are reinforced, and the soil reinforcement is divided into three times, the first reinforcement: vertical drilling 31 is first performed from the original ground, the drilling 31 is grouted to reinforce the sand layer at the bottom of the first phase of the second phase of the transfer passage foundation pit 1 and stabilize the soil at the bottom; the second reinforcement: drilling 31 is performed from the first phase of the transfer passage 21 in the adjacent direction, the drilling 31 is distributed in 9 rows along the horizontal direction and 5 rows along the vertical direction, the drilling 31 is grouted by a steel flower pipe to stabilize the soil under the drainage box culvert 9; the third reinforcement: the hole anchoring is performed between the two bored piles 11, the drilling 31 is obliquely drilled, the drilling 31 is distributed in 10 rows along the horizontal direction and 7 rows along the vertical direction, and the drilling 31 is grouted by a hollow anchor rod 32; the reinforcement construction method of the present application can solve the problem of difficult reinforcement of the sand layer of the first phase of the second phase of the transfer passage foundation pit 1;

[0061] Step 3) Protection construction of the drainage box culvert 9: the water stop steel plate 37 of concave structure is made, the 3mm thick water stop steel plate 37 is selected, the water stop steel plate 37 is cut into concave shape, the angle steel U-shaped buckle 371 is welded on both sides of the water stop steel plate 37, the welded angle steel U-shaped buckle 371 is 3m thick, the water stop steel plate 37 is fixed with the side wall of the drainage box culvert 9 through the angle steel U-shaped buckle 371 on both sides, the concave part in the middle of the water stop steel plate 37 is welded with the steel pipe 38, the welded steel pipe 38 is 900mm thick, after the installation and fixation of the water stop steel plate 37 are completed, the brick wall 39 is built to block, the drainage box culvert is blocked at both ends through the setting of the water stop steel plate 37 and the built brick wall 39, the rainwater is prevented from invading, the weight of the drainage box culvert is reduced, the width of the built brick wall is 3.1m, the height is 2.2m, the suspension rod 4 is arranged on the first concrete foundation pit horizontal inner support 13, the drainage box culvert is lifted by the suspension rod 4 so as to protect the drainage box culvert 9, the protection channel steel 5 is horizontally arranged on the second concrete foundation pit horizontal inner support 14, the protection channel steel 5 passes through the bottom of the drainage box culvert 9 and supports the drainage box culvert 9, in the specific implementation, when the protection channel steel 5 is horizontally arranged, the soil bodies on both sides of the drainage box culvert 9 are synchronously excavated, the protection channel steel 5 adopts the 40b channel steel@1500mm, the setting of the protection channel steel 5 supports the drainage box culvert 9, which can guarantee that the drainage box culvert 9 does not sink during the earthwork excavation; because the water in the upstream and downstream flows into the drainage box culvert 9, the both ends of the drainage box culvert 9 are blocked first, the suspension rod 4 is arranged on the first concrete foundation pit horizontal inner support 13 to lift, the protection channel steel 5 is horizontally arranged on the second concrete foundation pit horizontal inner support 14 to support the drainage box culvert 9, and various measures are adopted to protect the drainage box culvert.

[0062] Step 4) Continue the earthwork excavation, and carry out the two-stage construction of the interchange passage; before the earthwork excavation, the compactness and the consolidation strength of the grouting filling need to be inspected, the standard penetration method is adopted to determine that the standard penetration value reaches 10 hits to be qualified, the inspection drilling 31 is not less than 1% of the total number of grouting holes, and not less than 3 holes;

[0063] Step 5) The enclosing construction of the interchange passage one-stage and two-stage connection port: the power pipeline relocation, the water retaining wall 6 and the temporary enclosing structure 7 of the interchange passage one-stage and two-stage are constructed at night, the water retaining wall 6 is made of C20 concrete pouring, the height of the poured water retaining wall 6 is 1000mm, the thickness is 200mm, the enclosing structure 7 includes the enclosing foundation 71, the enclosing plate 72 and the enclosing fixing part 73, the deep recess groove 711 is formed on the upper end of the enclosing foundation 71, the bottom of the enclosing plate 72 is formed with the enclosing foot 721, the enclosing foot 721 of the bottom of the enclosing plate 72 is embedded into the deep recess groove 711 and is fixed through the enclosing fixing part 73, and then the deep recess groove 711 of the enclosing foundation 71 is filled with the mortar;

[0064] Step 6) The opening construction of the interchange passage one-stage and two-stage connection port: the side wall is removed, and the interchange passage one-stage 21 and the interchange passage two-stage are removed respectively;

[0065] Step 7) construction of the transfer passage one and two stage connection.

[0066] Step 8) transfer passage one and two stage through.

[0067] In the specific implementation of the present application, the third reinforcement of the soil on both sides of the drainage box culvert 9 uses hollow anchor rod 32 grouting and bored pile 11 connected by concrete retaining wall 33 at both ends, the soil on both sides of the drainage box culvert 9 is excavated from top to bottom, hollow anchor rod 32 is used immediately after each layer of excavation and grouting is arranged in the shape of a plum blossom, then the reinforcement mesh is hung on the hollow anchor rod 32, then the slurry is sprayed on the reinforcement mesh, then several layers of horizontal lattice steel frame 34 are installed, after the installation of several layers of horizontal lattice steel frame 34, the concrete is finally sprayed to form the concrete retaining wall 33. The thickness of the concrete retaining wall 33 is 400mm, the height of each layer of excavation is 0.8m, the concrete retaining wall 33 contains horizontal lattice steel frame 34, and the sequence of downward excavation. The several layers of horizontal lattice steel frame 34 are placed layer by layer from the bottom of the transfer passage two stage foundation pit 1 to the bottom of the drainage box culvert 9, the several layers of horizontal lattice steel frame 34 are connected into an integral structure by longitudinal connecting rib 35, the horizontal spacing of adjacent two layers of horizontal lattice steel frame 34 is 1m. The longitudinal connecting rib 35 is selected from No. 7 B20 steel, the vertical spacing of adjacent two layers of horizontal lattice steel frame 34 is 0.4m, in the specific implementation, at least one connecting steel bar 36 is arranged between adjacent two layers of horizontal lattice steel frame 34, the connecting steel bar 36 is connected between adjacent two layers of horizontal lattice steel frame 34 to form a triangular structure, the connecting steel bar 36 is selected from No. 7 B18 steel, each layer of horizontal lattice steel frame 34 includes four support main ribs 341 and a plurality of ring-shaped hoop ribs 342, the plurality of ring-shaped hoop ribs 342 are longitudinally and uniformly distributed on the four support main ribs 341, each ring-shaped hoop rib 342 surrounds the outer periphery of the four support main ribs 341 and is welded thereto, and the four support main ribs 341 are connected by the plurality of ring-shaped hoop ribs 342 to form the horizontal lattice steel frame 34. The cross section of the horizontal lattice steel frame 34 is rectangular, and inclined reinforcing ribs 343 are fixed between adjacent two ring-shaped hoop ribs 342 on the sides of the rectangle formed by the four support main ribs 341.

[0068] In the embodiment of the present application, the bored pile 11 is connected with the concrete retaining wall 33, the bored pile 11 is chiseled to expose the steel bars, and the exposed steel bars are connected with the steel bars of the concrete retaining wall 33 by welding. The second phase foundation pit 1 enclosure structure of the transfer passage adopts the enclosure structure form of 8 bored piles 11 + double-tube rotary jet piles 12 + the first concrete foundation pit horizontal inner support 13 and the second concrete foundation pit horizontal inner support 14, the hollow anchor rod 32 grouting + 400mm thick concrete retaining wall 33 connecting two end bored piles 11 are used on both sides below the drainage box culvert 9, and the vertical two concrete foundation pit horizontal inner supports are six in total. The construction method of the present application uses cement slurry to reinforce the soil 3 to stop water on the side of the bored pile 11 of the soil body on both sides below the drainage box culvert 9, the bored piles 11 on both sides of the drainage box culvert 9 are connected by the concrete retaining wall 33 on the inside of the foundation pit during the excavation of the second phase foundation pit 1 of the transfer passage, the soil above the drainage box culvert 9 is dug before the construction of the bored pile 11, the positions of the drainage box culvert 9 and the 10KV power pipe 10 are accurately positioned, the bored pile 11 is avoided from colliding with the underground power pipeline and the drainage box culvert 9, the power pipeline and the drainage box culvert 9 can be protected, the normal operation of the drainage box culvert 9 is ensured, the structural safety and stability of the transfer passage subway station 2 are ensured, and the construction efficiency of the first phase 21 and the second phase of the transfer passage is improved.

[0069] As shown in Figures 14-16 The steel ring 111 is pre-buried in the pile body of the bored pile 11 during the specific implementation of step 1) of the present application, the height of the steel ring 111 is from the bottom of the drainage box culvert 9 to the bottom of the second phase foundation pit 1 of the transfer passage, a plurality of layers of vertical steel plates 112 are welded to the steel ring 111, the size of the vertical steel plate 112 is 300*600mm, two support main bars 341 of the horizontal grid steel frame 34 are welded to the vertical steel plate 112 respectively, five steel ring anchor bars 113 are fixed in the vertical direction of the steel ring 111 of the bored pile 11, the spacing between the adjacent two steel ring anchor bars 113 is 300mm, the five steel ring anchor bars 113 are arranged in a radial manner, the steel ring anchor bar 113 is anchored into the pile body of the bored pile 11, and the steel ring anchor bar 113 is a U-shaped anchor bar.

[0070] As shown in Figure 13As shown, when step 3) of the present invention is specifically implemented, the 10KV power pipe 10 above the drainage culvert 9 is suspended and protected by a suspension structure 101. A suspension point is set at every 1m on the wall, and an expansion bolt 1013 is fixed at the suspension point. The suspension structure 101 includes a sleeve, a suspension rope 1011, and a basket bolt 1012. The sleeve is wrapped around the outer surface of the 10KV power pipe 10, and one end of the suspension rope 1011 is wrapped around the sleeve wrapped with the 10KV power pipe 10. The other end of the suspension rope 1011 is connected to one end of the basket bolt 1012, and the other end of the basket bolt 1012 is fixed to the suspension point by the expansion bolt 1013. Among them, the sleeve adopts 20mmPVC, the suspension rope 1011 adopts 6×19A16 steel wire rope, the suspension rope 1011 is fixed by the basket bolt 1012, and the basket bolt 1012 is fixed to the wall with the expansion bolt 1013.

[0071] like Figures 20-21 As shown, in an embodiment of the present invention, the enclosure plate 72 in step 5) includes an outer lightweight steel plate 722, an inner lightweight steel plate 723, and sound insulation cotton 724, which are arranged in sequence from the outside to the inside. The sound insulation cotton 724 is sandwiched between the outer lightweight steel plate 722 and the inner lightweight steel plate 723. The enclosure foundation 71 is cast with C20 concrete. The width of the enclosure foundation 71 is 300 mm and the height is 250 mm. The height of the deep groove 711 is 100 mm. Bolts can be used for the enclosure fixing parts 73. The retaining wall 6 of the present invention is mainly to prevent construction sewage from entering the operating station. The enclosure structure 7 is constructed, and the enclosure structure 7 is fully closed at the top and bottom. The sound insulation cotton 724 is sandwiched in the middle of the enclosure plate 72, which can achieve the effect of isolating noise and dust.

[0072] like Figure 22 As shown, the excavation construction of the connecting port of the first and second phases of the transfer channel in step 6 of the present invention specifically includes:

[0073] Step 61) The first phase of the transfer channel 21 is excavated first. After the side walls of the three steel support positions are removed, temporary first vertical steel supports 83, second vertical steel supports 84, and third vertical steel supports 85 are erected. Among them, the first vertical steel supports 83, the second vertical steel supports 84, and the third vertical steel supports 85 are all made of Q235 steel pipes with a diameter of φ609 mm and a wall thickness of 14 mm.

[0074] Step 62) Excavate the remaining main side walls of the Phase II transfer channel. This main side wall excavation is carried out in sections, proceeding downward from the top of the Phase I transfer channel (21) to the Phase II transfer channel. This section is excavated using a water drill and a rope saw. First, a hole (31) is drilled in each corner of each section. The section is then cut and pulled out using a rope saw. The sections are 1m x 0.82m in size. This method of excavating the side walls in sections reduces the impact of vibration on the existing line.

[0075] As Figure 23 As shown in the figure, in step 7), the specific construction process of the construction of the interface of the transfer passage first and second stages includes:

[0076] Step 71) construction of the hidden column 8;

[0077] Step 72) construction of the transfer passage first-stage pouring concrete beam 81;

[0078] Step 73) setting of the temporary steel support under the transfer passage first-stage 21 concrete beam;

[0079] Step 74) removal of the first vertical steel support 83, the second vertical steel support 84, and the third vertical steel support 85;

[0080] Step 75) construction of the transfer passage second-stage pouring concrete beam 86.

[0081] Step 76) removal of the temporary steel support, restoration of the original decoration, removal of the water retaining wall 6 and the enclosure structure 7, waterproof treatment of the interface of the transfer passage second-stage foundation pit 1, pre-burial of the grouting guide pipe in the bottom plate of the interface of the transfer passage second-stage foundation pit 1 for grouting reinforcement, and ensuring that the caulking at the interface forms a sealed and continuous waterproof wall, wherein the grouting guide pipe is connected by the lap joint method, the lap joint width is 20mm-30mm, the grouting pipe spacing is 8-13m, the grouting guide pipe opening end is temporarily blocked to prevent foreign matters from entering.

[0082] The entire interface construction process of the transfer passage first and second stages is symmetrically and synchronously performed, and the transfer passage second-stage post-poured beam can be constructed only after the strength of the transfer passage first-stage 21 concrete beam reaches 100%.

[0083] Compared with the prior art, the technical solution disclosed in the above embodiment has the following beneficial effects:

[0084] In the above embodiment, the construction method of the application reinforces the sand layer at the bottom of the transfer passage second phase foundation pit 11 and the soil on both sides of the drainage box culvert 9 below, blocks the two ends of the drainage box culvert 9, sets the suspension rod 44 on the first concrete foundation pit horizontal inner support 13, sets the protective channel steel 5 horizontally on the second concrete foundation pit horizontal inner support 14, the protective channel steel 5 passes through the bottom of the drainage box culvert 9, sets the protective channel steel 5 to support the drainage box culvert 9, uses multiple protection measures to protect the drainage box culvert 9, uses cement slurry to reinforce the soil 33 for sealing at the sides of the drainage box culvert 9, connects the bored piles 11 at both sides of the drainage box culvert 9 with the concrete retaining wall 33 inside the transfer passage second phase foundation pit 11, digs the soil above the drainage box culvert 9 before the bored pile 11 foundation construction, accurately positions the positions of the drainage box culvert 9 and the 10KV power pipe 10, avoids the conflict between the bored pile 11 and the underground pipeline and the drainage box culvert 9, and ensures the normal operation of the drainage box culvert 9 through the construction method of the application, guarantees the safety and stability of the traffic hub transfer passage structure, improves the construction efficiency of the transfer passage first and second phases, and solves the problem of difficult reinforcement of the sand layer in the transfer passage second phase.

[0085] The above has made a detailed description of the application, and the above is only a preferred embodiment of the application, which cannot limit the scope of the application, that is, all equivalent changes and modifications made according to the scope of the application should still be within the scope of the application.

Claims

1. A construction method for box culvert protection of a transfer passage at a comprehensive transportation hub, characterized by: The construction method for the connection of the first and second phases of the transfer channel of the integrated transportation hub includes the following steps: Step 1) Support Construction for the Transfer Channel Phase II Foundation Pit: A drainage box culvert spans the Transfer Channel Phase II foundation pit. The two sides of the Transfer Channel Phase II foundation pit are adjacent to the subway station entrance and Transfer Channel Phase I, respectively. Bored piles and double-tube jet grouting piles are constructed on the other two sides of the Transfer Channel Phase II foundation pit. These bored piles and double-tube jet grouting piles penetrate the bottom sand layer of the Transfer Channel Phase II foundation pit. Step 2) Reinforcement construction: The soil on both sides of the drainage box culvert is reinforced near the bored cast-in-place piles. The bottom sand layer of the transfer channel phase II foundation pit and the soil on both sides of the drainage box culvert are reinforced. The soil reinforcement is divided into three steps. The first reinforcement: first drill vertical holes from the original ground and inject grouting to reinforce the bottom sand layer of the transfer channel phase II foundation pit and stabilize the base soil; the second reinforcement: drill holes from the direction of the adjacent transfer channel phase I, and use steel pipes to inject grouting to stabilize the soil under the drainage box culvert; the third reinforcement: open holes and anchor them between the bored cast-in-place piles on both sides. The third reinforcement of the soil on both sides of the drainage box culvert is carried out by hollow anchor grouting and concrete retaining wall connection of bored piles located at the drainage box culvert. The soil on both sides of the drainage box culvert is excavated from top to bottom. After each layer is excavated, hollow anchors are immediately used and grouting is reinforced in a plum blossom pattern. Then, a steel mesh is hung on the hollow anchors. Then, slurry is sprayed on the steel mesh. Then, several layers of horizontal grid steel frames are installed. After several layers of horizontal grid steel frames are installed, concrete is finally sprayed to form a concrete retaining wall. Step 3) Drainage culvert protection construction: Fabricate a concave waterstop steel plate. Weld angle steel U-shaped clips on both sides of the waterstop steel plate. Secure the waterstop steel plate to the side wall of the drainage culvert via the angle steel U-shaped clips on both sides. After the waterstop steel plate is installed and secured, build brick walls to seal both ends of the drainage culvert. Simultaneously, excavate both sides of the drainage culvert. Install suspension rods on the first horizontal inner support of the concrete foundation pit. Use the suspension rods to lift the drainage culvert for protection. Horizontally place protective channel steel on the second horizontal inner support of the concrete foundation pit. The protective channel steel passes through the bottom of the drainage culvert and supports the drainage culvert. Step 4) Continue excavation of the drainage box culvert bottom and construction of the second phase of the transfer channel; Step 5) Enclosure Construction at the Transfer Channel Phases I and II Connection Port: The power pipeline relocation, retaining walls, and temporary enclosure structures for the Transfer Channel Phases I and II were all constructed at night. The enclosure structure consisted of an enclosure foundation, enclosure panels, and enclosure fixtures. The upper end of the enclosure foundation had a deep groove, and the bottom of the enclosure panels had enclosure feet. The enclosure feet at the bottom of the enclosure panels were embedded in the deep groove and secured with enclosure fixtures. The deep groove of the enclosure foundation was then filled with mortar. Step 6) Excavation and construction of the connection port of the transfer channel phases 1 and 2: demolish the side walls, and demolish the transfer channel phases 1 and 2 separately; Step 7) Construction of the transfer channel phases 1 and 2 docking ports; Step 8) The first and second phases of the transfer channel are completed.

2. The construction method for box culvert protection of a transfer passage in a comprehensive transportation hub according to claim 1 is characterized by: The bored piles are connected to the concrete retaining wall, and the bored piles are chiseled open to expose the steel bars, which are then connected to the steel bars of the concrete retaining wall by welding.

3. The construction method for box culvert protection of a transfer passage in a comprehensive transportation hub according to claim 1 is characterized by: Several layers of horizontal grid steel frames are placed layer by layer from the bottom of the transfer channel phase II foundation pit to the bottom of the drainage box culvert. Several layers of horizontal grid steel frames are connected into an integrated structure by longitudinal connecting reinforcements. The horizontal spacing between two adjacent layers of horizontal grid steel frames is 1m.

4. The construction method for box culvert protection of a transfer passage at a comprehensive transportation hub according to claim 1 is characterized by: Each layer of horizontal grid steel frame includes four supporting main bars and several circumferential ring bars. The several circumferential ring bars are evenly distributed on the four supporting main bars at longitudinal intervals. Each circumferential ring bar surrounds the outer circumference of the four supporting main bars and is welded to them. The four supporting main bars are connected by several circumferential ring bars to form a horizontal grid steel frame.

5. The construction method for box culvert protection of a transfer passage in a comprehensive transportation hub according to claim 1 is characterized by: In step 1), a steel ring is pre-embedded in the pile body of the bored pile. The height of the steel ring is from the bottom of the drainage box culvert to the bottom of the foundation pit of the second phase of the transfer channel. The steel ring is welded with several layers of vertical steel plates. The two supporting main bars of the horizontal grid steel frame are respectively welded with vertical steel plates. Five steel ring anchor bars are fixed in the vertical direction of the steel ring of the bored pile. The five steel ring anchor bars are arranged radially and anchored into the pile body of the bored pile.

6. The construction method for protecting a transfer passage at a comprehensive transportation hub against a box culvert according to claim 5 is characterized by: The 10KV power pipe above the drainage box culvert in step 3) is suspended and protected by a suspension structure. A suspension point is set every 1m on the wall, and an expansion bolt is fixed at the suspension point. The suspension structure includes a casing, a suspension rope, and a basket bolt. The casing is wrapped around the outer surface of the 10KV power pipe. One end of the suspension rope is wrapped around the casing wrapped with the 10KV power pipe, and the other end of the suspension rope is connected to one end of the basket bolt. The other end of the basket bolt is fixed to the suspension point through an expansion bolt.

7. The construction method for box culvert protection of a transfer passage at a comprehensive transportation hub according to claim 1 is characterized by: In step 5), the enclosure plate includes an outer lightweight steel plate, an inner lightweight steel plate, and sound insulation cotton arranged in sequence from the outside to the inside, the sound insulation cotton is sandwiched between the outer lightweight steel plate and the inner lightweight steel plate, and the enclosure foundation is cast with C20 concrete.

8. The construction method for box culvert protection of a transfer passage in a comprehensive transportation hub according to claim 1 is characterized by: In step 6), the excavation construction of the transfer channel phase I and II connection port specifically includes: Step 61) The first phase of the transfer channel is excavated first. After removing the side walls at the three steel support locations, temporary first vertical steel supports, second vertical steel supports, and third vertical steel supports are installed. Step 62) Excavate the remaining main side walls of the Transfer Channel Phase II. The main side walls will be excavated in blocks, starting from top to bottom in the order of Transfer Channel Phase I → Transfer Channel Phase II. Use a water drill + rope saw method to excavate. First, use a water drill to drill holes in the four corners of each small block, then use a rope saw to cut and pull out the blocks. The size of the blocks is 1m×0.82m.

9. The construction method for box culvert protection of a transfer passage at a comprehensive transportation hub according to claim 1 is characterized by: In step 7), the specific construction process of the interface construction of the transfer channel phases 1 and 2 includes: Step 71) Construction of concealed columns; Step 72) Concrete beams for the first phase of the transfer channel are poured; Step 73) Install temporary steel supports beneath the first-phase concrete beams of the transfer channel; Step 74) Dismantle the first vertical steel support, the second vertical steel support, and the third vertical steel support; Step 75) Construct the second phase of the transfer channel and pour concrete beams; Step 76) Remove the temporary steel supports, restore the original decoration, remove the retaining wall and enclosure structure, waterproof the interface of the transfer channel phase II foundation pit, and embed grouting conduits in the bottom plate of the transfer channel phase II foundation pit interface for grouting reinforcement to ensure that the joints at the junction form a sealed and continuous waterproof wall.

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