An assembled structure of a box culvert of a subgrade road and a large-section rectangular tunnel sharing a plate and a construction method

Abstract

The application provides an assembled structure and a construction method of a box culvert of a road under the ground and a large-section rectangular tunnel sharing a plate, the whole structure comprising a lower open-cut tunnel, a middle water-passing box culvert and an upper ground recovery road; all the reinforced concrete is a prefabricated assembled structure except for the middle partition wall of the water-passing box culvert, the middle partition wall of the water-passing box culvert is a cast-in-situ segment, penetrates through the water-passing box culvert, connects the plate structure on the top of the open-cut tunnel and the top plate of the box culvert into a whole, and is more stable in connection, so that the cracking phenomenon caused by uneven settlement is avoided. The bottom of the backfill soil of the backfill area of the box culvert platform is plain soil, the subgrade above the plain soil is 6% and 8% lime soil, the top layer is a pavement structure layer, a clamping plate is arranged near the bracket of the box culvert, and a pavement layer is arranged on the water-passing box culvert and the clamping plate. The application adopts the assembled structure to improve the construction efficiency, reduce the construction safety risk, save the engineering cost, ensure the safety of the ground road, the open-cut tunnel section and the river flow, and optimize the space use.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water conservancy and tunnel engineering, and particularly relates to an assembled structure of a box culvert underpassing a ground road and co-plate co-constructed with a large-section rectangular tunnel and a construction method. BACKGROUND

[0002] In urban infrastructure construction, box culverts are used to realize drainage and water passing functions, while tunnel construction often focuses on traffic diversion. If the traditional box culvert construction encounters tunnel engineering, especially large-section rectangular tunnels, independent construction of the two may cause unreasonable space utilization, complex construction procedures and mutual interference. With the increasing shortage of urban land resources, efficient use of underground space is required. Co-plate co-construction of box culverts and large-section rectangular tunnels can optimize the stress system of underground structures, reduce the impact on ground roads, improve construction efficiency and reduce construction costs. Therefore, how to provide an assembled structure of a box culvert underpassing a ground road and co-plate co-constructed with a large-section rectangular tunnel and a construction method has become a problem to be solved in current tunnel engineering construction. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application provides an assembled structure of a box culvert underpassing a ground road and co-plate co-constructed with a large-section rectangular tunnel and a construction method, which improves construction efficiency, reduces construction safety risks, saves engineering costs, ensures the safety of ground roads, open-cut tunnel sections and river flow, and optimizes space use.

[0004] The present application achieves the above technical objectives through the following technical means.

[0005] An assembled structure of a box culvert underpassing a ground road and co-plate co-constructed with a large-section rectangular tunnel, comprising a three-layer structure, namely an open-cut tunnel in the lower layer, a water passing box culvert in the middle layer, and a ground recovery road in the upper layer. Except for the box culvert middle partition wall in the water passing box culvert, the rest of the structures of the open-cut tunnel and the water passing box culvert are prefabricated reinforced concrete structures. The open-cut tunnel and the water passing box culvert are connected into a whole through the cast-in-place box culvert middle partition wall to avoid cracking caused by uneven settlement.

[0006] Further, the open-cut tunnel comprises an open-cut tunnel bottom plate, a tunnel side wall, a tunnel middle partition wall, a tunnel top plate and a co-plate structure, all of which are prefabricated and assembled according to two segments of a tunnel left line and a tunnel right line. Two large beams and a small beam are further arranged in the middle of the open-cut tunnel, and the co-plate structure is arranged between the two large beams. The co-plate structure simultaneously serves as the top structure of the open-cut tunnel and the bottom plate of the water passing box culvert.

[0007] Further, the water passing box culvert comprises a box culvert top plate, a box culvert partition plate, a revetment, and a box culvert middle partition wall, all of which are prefabricated parts; the box culvert top plate is divided into two segments, and the boundary line of the two segments is on the same vertical plane as the boundary line of the open-cut tunnel; a vertical embedded steel edge water stop belt is arranged at the connection between the box culvert top plate and the open-cut tunnel, the steel edge water stop belt is installed in cooperation with an arc-shaped groove and a slot on the open-cut tunnel, and waterproof slurry is injected into the groove and the slot; a tensioning slot is arranged at the corner top of the box culvert top plate, and an anchor for anchoring the water passing box culvert segment in cooperation with a steel strand is arranged in the tensioning slot; two strip corbels are arranged at the upper sides of the box culvert top plate, respectively, for the subsequent installation of a road deck plate; and a shear key is arranged on the non-anchoring surface of the box culvert top plate.

[0008] Further, the ground recovery road comprises backfill soil, a deck plate, and a pavement layer; the bottom of the backfill soil is plain soil, the roadbed above the plain soil is 6% lime soil and 8% lime soil, and the top layer is a pavement structure layer; corbels are arranged on the box culvert top plate, a plurality of deck plates are arranged between the corbels and the pavement structure layer, and a pavement layer is arranged on the water passing box culvert and the deck plates to recover the ground road.

[0009] Further, the bottom of the backfill soil is plain soil, the roadbed above the plain soil is 60 cm thick 6% lime soil and 80 cm thick 8% lime soil, and the top layer is a 70 cm thick pavement structure layer; four deck plates each 6 m long are arranged near the corbels of the pavement structure layer.

[0010] A construction method of an assembled structure of a box culvert passing through a ground road and co-plate co-constructed with a large-section rectangular tunnel, comprising the following processes:

[0011] S1. First, a soil bag cofferdam is constructed outside the structure in the river, water is pumped out, the cofferdam is dredged, and the area is backfilled and dewatered; then, bored piles and crown beam support beams are constructed, steel supports are erected, and earthwork is excavated; after the excavation of the foundation pit is completed, the concrete cushion is poured; after reaching the strength, the bottom plate and the side wall waterproof layer are constructed;

[0012] S2. After the concrete design strength is reached, the components of the prefabricated assembled structure are transported to the construction site respectively;

[0013] S3. First, the tunnel bottom plate is hoisted, then the tunnel side wall, the tunnel middle partition wall, and finally the tunnel top plate are hoisted respectively; the components are tightly attached, and high-strength waterproof slurry is injected at the joints;

[0014] S4. After two large beams and one small beam are hoisted at the corresponding positions, the co-plate structure is hoisted, which simultaneously serves as the tunnel middle top plate and the box culvert bottom plate; after the hoisting and splicing of the components are completed, the box culvert partition plate is hoisted to the co-plate structure;

[0015] S5, hoist the box culvert top plate to the box culvert baffle, and cooperate the protruding steel edge water stop belt at the lower end of the box culvert top plate with the arc-shaped groove and slot on the open-cut tunnel, and inject waterproof slurry;

[0016] S6, an outward protruding anchor is arranged in the tension slot at the corner top of the box culvert top plate, the steel strand is passed through the prefabricated hole and cooperates with the anchor to complete the anchoring of the segment box culvert;

[0017] S7, the partition wall in the cast-in-place box culvert is used to connect the common plate structure and the box culvert top plate into a whole, and then the box culvert revetment (204) on both sides is installed to guide the flow; then the cofferdam is removed, and the river system is completed;

[0018] S8, backfilling the box culvert platform: on the tunnel top plate near the water passing box culvert, the soil is backfilled to form a step-shaped structure with a slope of 1:2.0, the roadbed above the step is backfilled with 6% ash soil, the part of the step near the water passing box culvert is backfilled with 8% ash soil, the upper layer of the roadbed is backfilled with 8% ash soil, and the top layer is provided with a road surface structure layer; finally, the bracket arranged on the box culvert top plate is connected with the road surface structure layer through a transition plate;

[0019] S9, a paving layer is arranged on the water passing box culvert and the transition plate to restore the ground road.

[0020] The present application has the following beneficial effects:

[0021] The present application adopts a fabricated structure, all the reinforced concrete is a prefabricated component, the tunnel and the box culvert are divided into segments, the parts are convenient to move, hoist and adjust the position. The partition wall in the box culvert is a cast-in-place segment, which penetrates through the whole tunnel and the box culvert, so that the components are connected into a whole, and the stability of the whole structure is ensured. The fabricated structure and the cast-in-place segment are combined, the structure is simple, the cast-in-place process is greatly reduced, especially the use of a large number of high formworks is reduced, and the quality, efficiency and safety of the construction are significantly improved.

[0022] The shear key is used to bite and contact between the segments, so as to avoid the sliding displacement between different segments. The tension slot is arranged at the corner top of the box culvert top plate, the pre-stressed steel strand can penetrate through the tension slot, and the bearing capacity and stability of the concrete structure are effectively improved. The vertical embedded steel edge water stop belt is arranged at the connection between the box culvert top plate and the tunnel, so as to prevent the river water from seeping into the roadbed.

[0023] The box culvert bottom plate and the tunnel top plate are used to form a common plate structure in the tunnel and the box culvert overlapping and sharing segment, compared with the independent design of the two, the method optimizes the space use and stress system, reduces the construction cost, is energy-saving, environmentally friendly and economically reasonable.

[0024] The application is applicable to the orthogonal or oblique box culvert and tunnel, and applicable to the single or multiple chamber structure of the box culvert and tunnel, and the operation process is efficient and convenient, and has high popularization value. In the embodiment, the box culvert and tunnel main line are oblique, and the box culvert partition plate is arranged to make the river centerline straight, avoid the local water flow impact or vortex to cause the component damage, and ensure the stable state of the water flow. In the embodiment, due to the large structure scale, the multiple chamber structure is adopted. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a box culvert and tunnel superimposed and shared plate structure schematic diagram;

[0026] Figure 2 It is a split schematic diagram of the three-layer structure of the open-cut tunnel, the water passing box culvert and the ground recovery road;

[0027] Figure 3 It is an open-cut tunnel structure schematic diagram;

[0028] Figure 4 It is a water passing box culvert structure schematic diagram;

[0029] Figure 5 It is a ground recovery road schematic diagram;

[0030] Figure 6 It is a box culvert steel edge water stop belt connecting piece, tension groove and shear key schematic diagram;

[0031] Figure 7 It is a box culvert backfill schematic diagram;

[0032] In the drawing: 1-open-cut tunnel, 2-water passing box culvert, 3-ground recovery road, 4-tunnel left line, 5-tunnel right line, 101-tunnel bottom plate, 102-tunnel side wall, 103-tunnel middle partition wall, 104-tunnel top plate, 105-shared plate structure, 106-large beam, 107-small beam, 201-box culvert top plate, 202-box culvert partition plate, 203-box culvert middle partition wall, 204-box culvert revetment, 205-steel edge water stop belt, 206-tension groove, 207-hanging leg, 208-shear key, 301-backfill soil, 302-bridge plate, 303-paving layer. DETAILED DESCRIPTION

[0033] The application will be further described below in conjunction with the drawings and specific embodiments, but the protection scope of the application is not limited thereto. The background of the application is the south extension project of Changjiang Road in Suzhou, which is located in Wuzhong District of Suzhou City, starts at the intersection of Changjiang Road and Qizi Road, goes south along Changjiang Road, underpasses Qizishan mountain body, and ends at the intersection of Wangshan Road and Nanguandu Road. The total length of the project line is 6.428 km. The open-cut tunnel is designed as a single-box double-chamber large-section rectangular structure type, underpasses Wangshan River at MLK5+360~MLK5+390, and a box culvert needs to be constructed above the tunnel for drainage. After the completion of the box culvert, the earthwork is backfilled to restore the ground road. The geological conditions of the construction site are alluvial and residual clay, silty clay, silt, sand, gravelly silty clay and gravel soil. The groundwater is abundant, and the construction difficulty and risk are large.

[0034] As shown in Figure 1 , 2 , the assembled structure of the box culvert underpassing the ground road and co-plate construction with the large-section rectangular tunnel according to the application is divided into three layers. The lower layer is the open-cut tunnel 1, the middle layer is the water passing box culvert 2, and the upper layer is the ground recovery road 3. As shown in Figures 1 to 4 , all the reinforced concrete except the box culvert mid-partition wall 203 in the water passing box culvert 2 is an assembled structure, which is a prefabricated component. The box culvert mid-partition wall 203 is a cast-in-place segment that penetrates through the entire water passing box culvert 2, and forms a whole with the co-plate structure 105 and the box culvert top plate 201, so that the connection between the water passing box culvert 2 and the open-cut tunnel 1 is more stable, and the cracking phenomenon caused by uneven settlement is avoided.

[0035] As shown in Figure 2 , 3 , the open-cut tunnel 1 includes the open-cut tunnel bottom plate 101, the tunnel side wall 102, the tunnel mid-partition wall 103, the tunnel top plate 104 and the co-plate structure 105, which are all prefabricated according to the tunnel left line 4 and the tunnel right line 5 two segments and assembled together. Due to the large span, two large beams 106 (cross-sectional size is 1.40m×4.05m) and a small beam 107 (cross-sectional size is 0.8m×1.4m) are arranged in the middle to ensure the stability of the overall structure. The co-plate structure 105 is arranged between the two large beams 106, and simultaneously serves as the open-cut tunnel top plate and the box culvert bottom plate.

[0036] As shown in Figure 1 , 2, 4, 6, the water box culvert 2 includes box culvert roof 201, box culvert partition 202, box culvert partition wall 203, revetment 204 four parts; box culvert roof 201, box culvert partition 202, revetment 204 is a prefabricated part, box culvert partition wall 203 is a cast-in-place segment. Among them, the box culvert roof 201 is divided into two segments, and the boundary line is on the same vertical plane with the boundary line of the open-cut tunnel 1; the box culvert roof 201 is provided with a vertical embedded steel edge water stop 205 at the connection with the open-cut tunnel 1, and a tension groove 206 is provided at the corner top position of the box culvert; two strip corbels 207 are respectively arranged at the upper position on both sides of the box culvert roof 201, facilitating the installation of the deck 302; a shear key 208 is arranged on the non-anchoring surface of the box culvert roof 201.

[0037] As shown in Figure 5 , the ground recovery road 3 includes backfill 301, deck 302; the box culvert platform back is backfilled, the bottom of the backfill 301 is plain soil, the roadbed above is 60cm thick 6% lime soil and 80cm thick 8% lime soil, and the top layer is 70cm thick pavement structure layer. Above the tunnel roof 104 near the water box culvert 2 for 5m, the plain soil backfill is arranged in a step shape with a slope of 1:2.0, the step above is 6% lime soil, and the step near the water box culvert 2 part is 8% lime soil. Four groups of 6m long decks 302 are laid near the box culvert corbel of the pavement structure layer, and a paving layer 303 is arranged on the water box culvert 2 and the deck 302, thereby recovering the ground road.

[0038] Referring to Figures 1 to 7 , the assembly type structure construction method of the box culvert passing through the ground road and co-plate co-constructed with the large-section rectangular tunnel, comprises the following processes:

[0039] S1, first construct a soil bag cofferdam outside the structure in the river, pump water, dredge, backfill soil in the cofferdam, and dewater the area. Then construct bored piles and crown beam support beams, timely erect steel supports, and excavate earthwork. After the foundation pit excavation is completed, pour the concrete cushion. After reaching the strength, make the bottom plate and side wall waterproof layer.

[0040] S2, the various components of the prefabricated assembly type structure are transported to the construction site after reaching the design strength of the concrete;

[0041] S3, first hoist the bottom plate component of the left line 4 and the right line 5 of the tunnel (i.e. the tunnel bottom plate 101), then hoist the side wall and the partition wall of the left line 4 and the right line 5 of the tunnel (i.e. the tunnel side wall 102, the tunnel partition wall 103), and finally hoist the tunnel left and right line roof (i.e. the tunnel roof 104); each part is required to be close and high-strength waterproof slurry is injected at the joint; when making the prefabricated part, the size and quality of the component need to be ensured, and attention needs to be paid to the shear key of the non-anchoring surface not being damaged during transportation.

[0042] S4, after hoisting two girders 106 and a small beam 107 in the corresponding position, hoist the common plate structure 105, which simultaneously serves as the middle roof of the tunnel and the bottom plate of the box culvert; after the completion of hoisting and splicing of each component, hoist the box culvert partition plate 202 to the common plate structure 105.

[0043] S5, hoist the box culvert top plate 201 above the box culvert partition plate 202, and the shear keys 208 between the two-warehouse box culvert top plates 201 need to be non-destructively attached for mutual engagement of the two-warehouse box culvert top plates 201 during anchoring; the box culvert top plate 201 lower end protrusion, the middle buried type steel edge water stop 205 is matched with the arc-shaped groove and slot on the open-cut tunnel 1 (i.e. the girder 106), and the waterproof slurry is injected.

[0044] S6, the outward protruding anchor is arranged in the tension slot 206 at the corner top of the box culvert top plate 201, the steel strand is passed through the prefabricated hole, and the anchoring of the segment box culvert is completed by cooperating with the anchor.

[0045] S7, the cast-in-place box culvert partition wall 203 is installed, so that the common plate structure 105 and the box culvert top plate 201 form a whole, ensuring the stability of the structure; then the box culvert revetment 204 on both sides is installed for flow diversion; then the cofferdam is removed, and the river water system is completed.

[0046] S8, backfilling the box culvert platform: using plain soil, 6% and 8% lime soil for backfilling, specifically, above the tunnel roof 104 of 5m near the water crossing box culvert 2, the plain soil backfilling is arranged in a step shape with a slope of 1:2.0, the step is 60cm thick 6% lime soil, the step near the water crossing box culvert 2 is 8% lime soil, the next layer of roadbed is 80cm thick 8% lime soil, and the top layer is 70cm thick pavement structure layer; the bracket is arranged on the box culvert top plate 201, and the bracket and the pavement structure layer are transitionally connected by a 6m long lapping plate 302; during backfilling, small compaction equipment is used for compaction to ensure that the compaction degree reaches the requirement and eliminate the bridgehead bumping hidden danger, and the compaction degree should be not less than 96%.

[0047] S9, laying the box culvert top pavement layer 303, and restoring the ground road.

[0048] The application of the technology in the embodiment promotes the development and innovation of the tunnel and box culvert common plate co-construction assembly type structure construction, and contributes to the technical progress in the related field.

[0049] The embodiment is a preferred embodiment of the present application, but the present application is not limited to the above-mentioned embodiment, any obvious improvement, replacement or modification made by those skilled in the art without departing from the essential content of the present application shall fall within the protection scope of the present application.

Claims

1. An assembled structure of a box culvert of a subgrade road and a large-section rectangular tunnel co-plate co-constructed, characterized in that, The application relates to a three-layer structure, which comprises a lower open-cut tunnel (1), a middle water-passing box culvert (2) and an upper ground recovery road (3); except for a box culvert middle partition wall (203) in the water-passing box culvert (2), the rest of the open-cut tunnel (1) and the water-passing box culvert (2) are prefabricated reinforced concrete structures; the open-cut tunnel (1) and the water-passing box culvert (2) are connected into a whole through the cast-in-place box culvert middle partition wall (203) to avoid cracking caused by uneven settlement.

2. The box culvert of the underpass road and the assembly type structure of the co-plate and co-construction with the large-section rectangular tunnel according to claim 1, characterized in that, The open-cut tunnel (1) comprises an open-cut tunnel bottom plate (101), a tunnel side wall (102), a tunnel middle partition wall (103), a tunnel top plate (104) and a common plate structure (105), which are all prefabricated and assembled according to two sections of a tunnel left line (4) and a tunnel right line (5); two large beams (106) and a small beam (107) are arranged in the middle of the open-cut tunnel (1), the common plate structure (105) is arranged between the two large beams (106), and the common plate structure (105) simultaneously serves as a top structure of the open-cut tunnel (1) and a bottom plate of the water-passing box culvert (2).

3. The box culvert of the underpass road and the assembly type structure of the co-plate and co-construction with the large-section rectangular tunnel according to claim 2, characterized in that, The water-passing box culvert (2) comprises a box culvert top plate (201), a box culvert partition plate (202), a revetment (204) and a box culvert middle partition wall (203) which are all prefabricated, and a cast-in-place section; the box culvert top plate (201) is divided into two sections, and the boundary line is located on the same vertical plane as that of the open-cut tunnel (1); a vertical embedded steel edge water stop belt (205) is arranged at the connection position of the box culvert top plate (201) and the open-cut tunnel (1), the steel edge water stop belt (205) is matched and installed with an arc-shaped groove and a slot on the open-cut tunnel (1), and is filled with waterproof slurry; a tensioning groove (206) is arranged at the corner top position of the box culvert top plate (201), an anchor device for anchoring the section water-passing box culvert (2) in cooperation with a steel strand is arranged in the tensioning groove (206); two strip corbels (207) are arranged at the upper positions on the two sides of the box culvert top plate (201) respectively, and are used for installing a hanging plate (302) in a subsequent ground recovery road (3); and a shear key (208) is arranged on the non-anchoring surface of the box culvert top plate (201).

4. The box culvert of the underpass road and the assembly type structure of the co-plate and co-construction with the large cross-section rectangular tunnel according to claim 3, characterized in that, The ground recovery road (3) comprises backfill soil (301), a hanging plate (302) and a pavement layer (303); the bottom of the backfill soil (301) is plain soil, the roadbed above the plain soil is 6% lime soil and 8% lime soil, and the top layer is a pavement structure layer; corbels are arranged on the box culvert top plate (201), a plurality of groups of the hanging plates (302) are arranged between the corbels and the pavement structure layer, and the water-passing box culvert (2) and the hanging plates (302) are provided with the pavement layer (303), so that the ground road is recovered.

5. The box culvert of the underpass road and the assembly type structure of the co-plate and co-construction with the large cross-section rectangular tunnel according to claim 4, characterized in that, The bottom of the backfill soil (301) is plain soil, the roadbed above the plain soil is 60cm-thick 6% lime soil and 80cm-thick 8% lime soil, and the top layer is a 70cm-thick pavement structure layer; four groups of the hanging plates (302) with a length of 6m are arranged near the corbels of the pavement structure layer.

6. The construction method of the box culvert of the underpass road and the fabricated structure of the co-plate co-construction with the large-section rectangular tunnel according to claim 4, characterized in that, The method comprises the following processes: S1, first in the river structure outside the construction of soil bags cofferdam, cofferdam pumping, dredging, backfill, and the area to dewatering; then construction of bored piles and crown beam support beam, erection of steel support, and earth excavation; after the completion of the foundation pit excavation, pouring concrete mat; reach the strength of the bottom plate and side wall after the waterproof layer; S2, prefabricated components of the structure, respectively after the concrete design strength transported to the construction site; S3, first hoist tunnel floor (101), then hoist tunnel side wall (102), tunnel partition wall (103), and finally hoist tunnel roof (104); each part of the paste, and in the joint injection of high strength waterproof slurry; S4, hoist two beams (106) and a small beam (107) in the corresponding position, hoist the common plate structure (105), which is also used as the tunnel roof and box culvert floor; after the completion of the hoisting of the components and the completion of the splicing, hoist the box culvert partition (202) to the common plate structure (105); S5, hoist the box culvert roof (201) above the box culvert partition (202), and the box culvert roof (201) end protruding, embedded steel edge water stop (205) and the arc groove, slot on the open cut tunnel (1) cooperate, and inject waterproof slurry; S6, the anchor in the tension groove (206) at the corner of the box culvert roof (201) is set outwardly protruding, the steel strand is passed through the precast hole and used with the anchor to complete the anchoring of the segmental box culvert; S7, cast-in-place box culvert partition wall (203), so that the common plate structure (105) and the box culvert roof (201) into a whole, and then install the box culvert revetment (204) on both sides to guide the flow; then remove the cofferdam, complete the river water system through; S8, backfill the box culvert abutment: above the tunnel roof (104) near the water box culvert (2), the soil backfill is set to a step shape with a slope of 1:2.0, the step above is set to 60cm thick 6% lime soil backfill, the step near the water box culvert (2) is set to 8% lime soil backfill, and the next layer is set to 80cm thick 8% lime soil backfill, and the top layer is set to 70cm thick pavement structure layer; finally, the bracket set on the box culvert roof (201) is connected with the pavement structure layer by the transition plate (302); S9, set the paving layer (303) on the water box culvert (2) and the transition plate (302) to restore the ground road.

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