Tunnel integrated cross trench construction

Abstract

The application belongs to the technical field of urban tunnel construction, and discloses a tunnel integrated cross trench structure, which comprises a cross trench body arranged in a tunnel bottom plate main structure; the cross trench body is in a form of a narrow upper part and a widened lower part, and is reinforced by a trench body steel bar; a reinforced concrete layer and a steel mesh are arranged on the two sides of the cross trench body, and the reinforced concrete layer is connected with the tunnel bottom plate main structure through annular connecting steel bars; a drainage grate cover plate is arranged on the top surface of the cross trench body, and the two sides of the drainage grate cover plate are connected with a drainage grate base through fixing bolts; a safety buckle is arranged on the bottom surface of the drainage grate cover plate and is used for engaging with the drainage grate base. The application optimizes the structure type of the cross trench, strengthens the mechanical properties of the concrete on the two sides, avoids the drainage grate cover plate from jumping up when the fixing measures are damaged, effectively improves the safety and reliability of the drainage grate fixing mode, and realizes stronger wear resistance, durability and impact resistance of the tunnel cross trench.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of urban tunnels, in particular, relates to a cross ditch structure for a tunnel. BACKGROUND

[0002] With the growth of urban economy and the high concentration of population, the urban traffic congestion situation is increasingly severe, the urban road grade separation design is greatly increased, and the urban tunnel is therefore constructed in large quantities. As an important underground structure, the drainage of the urban tunnel is crucial, the cross ditch is arranged at the tunnel portal and the lowest point, which can reduce the rainwater collection to the tunnel, and quickly drain the rainwater to the external drainage equipment such as the pump house, thereby reducing the risk of water accumulation in the tunnel and improving the safety of the tunnel operation.

[0003] The common cross ditch setting mode is to groove on the tunnel pavement, and to adopt cast iron cross ditch grating and fix it on the pavement by bolts. Due to the large longitudinal slope usually arranged at the tunnel portal, the cross ditch is easily caused to jump under the impact of the car. At the same time, under the repeated impact of the wheels, the cross ditch cover plate and the bolt are easily vibrated and loosened, the structure on both sides of the cross ditch and the pavement are damaged, which seriously affects the comfort of driving, and in the more serious case, the structure damage causes the cover plate to jump up and other accidents, which threatens the driving safety at the cross ditch position. The common diseases of the cross ditch lead to frequent maintenance, which seriously affects the operation and maintenance of the road. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a tunnel integrated cross ditch structure, which is better improved in the installation structure and the fixing mode of the cross ditch drainage grating.

[0005] The present application is realized by the following technical solutions:

[0006] The present application provides a tunnel integrated cross ditch structure, which comprises a cross ditch groove body arranged in the tunnel bottom plate main structure; characterized in that the cross ditch groove body is in the form of narrow upper part and widened lower part, and is reinforced by groove body steel bars; the both sides of the cross ditch groove body are paved with a reinforced concrete layer, the reinforced concrete layer adopts steel fiber concrete; and a steel mesh is arranged on the surface of the reinforced concrete layer.

[0007] A drainage grating cover plate is arranged on the top surface of the cross ditch groove body, a drainage grating base is arranged below the both sides of the drainage grating cover plate, and the drainage grating base is embedded in the reinforced concrete layer; the drainage grating cover plate and the drainage grating base are connected by fixing bolts.

[0008] The reinforced concrete layer and the tunnel bottom plate main structure are connected by an annular connecting steel bar, the bottom of the annular connecting steel bar is sleeved and welded with the groove body steel bar, and the top is welded with the fixing bolt.

[0009] The bottom surface of the drain grate cover plate is provided with a safety buckle, which can be engaged with the drain grate base when the fixing bolt is loosened and the drain grate cover plate is impacted upward to jump up, thereby limiting the drain grate cover plate vertically.

[0010] Further, the thickness of the reinforced concrete layer is equal to the total thickness of the road surface structure surface layer and the road surface structure lower layer.

[0011] Further, the steel mesh is welded and fixed with the drain grate base.

[0012] Further, a shock-absorbing rubber pad is arranged between the bottom surface of the drain grate cover plate and the drain grate base.

[0013] Further, the safety buckle has an L-shaped cross section, including a vertical supporting plate and a horizontal clamping claw; the top of the supporting plate is welded with the bottom surface of the drain grate cover plate, and the clamping claw extends outward of the drain grate cover plate.

[0014] Further, the bottom plate is arranged between the bottom surface of the drain grate and the safety buckle during installation, and the vertical plate is used to transversely constrain the reinforced concrete layer.

[0015] Further, the drain grate cover plate at both ends and every interval of the cross-cut ditch is not provided with a safety buckle.

[0016] The beneficial effects of the present application are:

[0017] (1) The present application optimizes the structure type of the cross-cut ditch, and appropriately separates the longitudinal water collection and transverse drainage functions of the cross-cut ditch, which can reduce the road surface width and groove depth of the cross-cut ditch, and improve the transverse drainage efficiency of the cross-cut ditch, thereby reducing the possibility of diseases of the cross-cut ditch;

[0018] (2) The present application strengthens the mechanical properties of the concrete on both sides of the cross-cut ditch, improves the constraint on the adjacent road surfaces on both sides, avoids the cracking and damage of the road surface around the drain grate under the long-term vehicle load, and makes it have stronger wear resistance, durability and impact resistance;

[0019] (3) The drain grate cover plate and the base of the present application are fixed by fixing bolts and connected with the reinforced concrete layer, which effectively improves the safety and reliability of the fixing mode of the drain grate;

[0020] (4) The drain grate cover plate of the present application is provided with a safety buckle, which is engaged between the drain grate cover plate and the base, thereby avoiding the jump of the drain grate cover plate in the case of damage of the fixing measure, and greatly improving the safety of the drain grate cover plate.

[0021] (v) The bottom surface of the drainage grate cover of the present invention is provided with shock-absorbing rubber pads, which can improve the tightening effect of the fixing bolts and reduce the impact of the cover vibration on the base and concrete structure, thereby improving the durability of the structure and driving comfort. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of the integrated tunnel cross-section trench structure provided by the present invention;

[0023] Figure 2 This is a schematic diagram of the road surface combination structure of the integrated tunnel cross-ditch structure provided by the present invention;

[0024] Figure 3 This is a schematic diagram of the reinforcing steel bars in the integrated cross-cut trench structure provided by the present invention.

[0025] Figure 4 This is a schematic diagram of the drainage grate in the integrated tunnel cross-section trench structure provided by the present invention.

[0026] In the above diagram: 1. Road surface layer, 2. Road lower layer, 3. Tunnel bottom slab main structure, 4. Reinforced concrete layer, 5. Steel mesh, 6. Drainage grate cover, 7. Drainage grate base, 8. Shock-absorbing rubber pad, 9. Fixing bolt, 10. Circular connecting steel bar, 11. Trench steel bar, 12. Safety buckle. Detailed Implementation

[0027] To further understand the content, features, and effects of this invention, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0028] like Figures 1-3 As shown, this embodiment discloses an integrated tunnel cross-cutting ditch structure. The cross-cutting ditch is located within the main structure 3 of the tunnel floor slab and is grooved. The ditch body adopts a bottle-shaped structure, that is, a variable cross-section design with a narrow upper opening and a widened lower opening. While satisfying the longitudinal water collection function of the cross-cutting ditch, it also improves the lateral drainage capacity on both sides of the cross-cutting ditch, realizing the separation of the longitudinal and lateral water collection and drainage functions of the tunnel and avoiding the large open design of the cross-cutting ditch. At the same time, to enhance the stability of the cross-cutting ditch body, steel bars 11 are used to reinforce the cross-cutting ditch. This invention provides an optimized design scheme to reduce the top width of the cross-cutting ditch by optimizing the shape structure of the cross-cutting ditch and appropriately separating the longitudinal and lateral water collection and drainage functions of the cross-cutting ditch, fundamentally reducing the probability of cross-cutting ditch defects.

[0029] The two sides of the crosscut groove body are laid with a reinforced concrete layer 4 for local reinforcement, the thickness of the reinforced concrete layer 4 is equal to the total thickness of the road surface structure surface layer 1 and the road surface structure lower layer 2, and the laying range of the reinforced concrete layer 4 is preferably 20-30 cm wide. The reinforced concrete layer 4 is made of steel fiber reinforced concrete, and a steel mesh 5 is arranged on the surface of the first concrete layer 4 to strengthen the impact resistance of the concrete. The crosscut groove itself is strengthened in impact resistance and wear resistance by the reinforcement scheme of the reinforced concrete layer 4 and the steel mesh 5 on the two sides of the crosscut groove, and the road surface on the two sides is also constrained, thereby improving the road surface stability of the crosscut groove area and greatly improving the driving comfort and safety in the crosscut groove area.

[0030] The drainage grate of the crosscut groove is composed of a drainage grate cover plate 6 and a drainage grate base 7, the drainage grate cover plate 6 is arranged on the top surface of the crosscut groove, the drainage grate base 7 is located below the two sides of the drainage grate cover plate 6 and is embedded in the reinforced concrete layer 4. At the same time, the outer side of the drainage grate base 7 is preferably spot welded with the steel mesh 5. The two sides of the drainage grate cover plate 6 are connected with the drainage grate base 7 through fixing bolts 9, and the bottom of the fixing bolts 9 is embedded in the reinforced concrete layer 4. Preferably, a shock-absorbing rubber pad 8 is arranged between the bottom surface of the drainage grate cover plate 6 and the drainage grate base 7, which can not only improve the fastening effect of the fixing bolts 9, but also relieve the impact of the vibration of the drainage grate cover plate 6 on the drainage grate base 7 and the reinforced concrete layer 4.

[0031] The reinforced concrete layer 4 and the tunnel bottom plate main structure 3 are connected through annular connecting steel bars 10 for improving the connection between the two. The lower half of each annular connecting steel bar 10 is embedded in the tunnel bottom plate main structure 3, and the bottom thereof is welded and fixed with a groove body steel bar 11. The upper half of each annular connecting steel bar 10 is embedded in the reinforced concrete layer 4, and the top thereof is welded and fixed with the bottom of the fixing bolt 9. A plurality of annular connecting steel bars 10 are arranged at equal intervals on the two sides of the crosscut groove, and the annular connecting steel bars 10 corresponding to the positions of the fixing bolts 9 can be welded with the fixing bolts 9.

[0032] The present application strengthens the connection performance between the upper part of the crosscut groove and the main structure through the annular steel bars 10, and reliably fixes the fixing bolts 9 in the structure by welding the fixing bolts 9 with the annular steel bars 10 and welding the annular steel bars 10 with the groove body steel bars 11, thereby avoiding the loosening of the fixing bolts and the anchoring failure under the long-term impact of vehicles.

[0033] Two end portions on the bottom surface of the drain grate cover plate 6 are respectively provided with a safety buckle 12, the safety buckle 12 has an L-shaped cross section, including a vertical supporting plate and a horizontal clamping claw, the top of the supporting plate is welded with the bottom surface of the drain grate cover plate 6, and the clamping claw extends towards the outside of the drain grate cover plate 6. The drain grate base 7 includes a bottom plate and a vertical plate welded on the bottom plate. During installation, the bottom plate and the vertical plate of the drain grate base 7 abut against the bottom surface and the side surface of the drain grate cover plate 6 respectively, and the inner end of the bottom plate of the drain grate base 7 is located between the bottom surface of the drain grate base 7 and the clamping claw of the safety buckle 12. Meanwhile, the vertical plate of the drain grate base 7 can also transversely constrain the reinforced concrete layer 4. In this way, when the drain grate cover plate 6 is impacted and pops up from bottom to top, the drain grate cover plate 6 can be prevented from being pulled out by the limiting effect of the drain grate base 7.

[0034] The present application realizes the secondary protection of the drain grate cover plate 6 through the engagement between the drain grate cover plate 6 and the drain grate base 7, guarantees the safety of the cover plate under high-speed driving in extreme conditions, and provides controllable risks for the operation and maintenance of the road.

[0035] The installation mode of the cross-gutter drain grate is as follows: the fixed bolt 9 is welded and fixed with the annular connecting steel bar 10, and the fixing of the drain grate base 7 and the fixed bolt 9 is completed at the same time as the pouring of the reinforced concrete layer 4. After the curing of the reinforced concrete layer 4 is completed, the installation of the drain grate cover plate 6 is performed. Before installation, the shock-absorbing rubber pad 8 is first installed on the drain grate base 7, then the drain grate cover plate 6 is positioned based on the drain grate base 7, and finally the nuts of the fixed bolt 9 are fastened.

[0036] Specifically, the reinforced concrete layer 4 should be poured after the concrete pouring of the tunnel bottom plate main structure 3 is completed, and the lower layer 2 and the surface layer 1 of the road surface structure are constructed. In order to guarantee the construction quality of the surface layer 1 of the road surface structure, the pouring range of the reinforced concrete layer 4 should be cut by using the reverse slotting construction process after the rolling and compaction of the surface layer 1 of the road surface structure is completed.

[0037] In addition, a drain grate cover plate 6 without a safety buckle 12 is arranged at every interval distance at both ends and in the middle of the cross-gutter, which is used for conveniently opening when the water ditch is dredged.

[0038] Although the preferred embodiments of the present application are described above in combination with the drawings, the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many specific changes in form without departing from the purpose of the present application and the scope protected by the claims under the inspiration of the present application, and these all belong to the protection scope of the present application.

Claims

1. A tunnel integrated crosscut trench construction comprising a crosscut trench body formed in a tunnel floor main structure; characterized by, The cross trench body is in the form of upper narrow mouth and lower widening, and is reinforced by groove body steel bars; both sides of the cross trench body are paved with reinforced concrete layers, which are made of steel fiber concrete; the surface layer of the reinforced concrete layers is provided with steel mesh; The top surface of the cross trench body is provided with a drainage grate cover plate, the two sides of the drainage grate cover plate are provided with drainage grate bases below, the drainage grate bases are embedded in the reinforced concrete layers; the drainage grate cover plate and the drainage grate bases are connected by fixing bolts; The reinforced concrete layers and the tunnel bottom plate main body structure are connected by annular connecting steel bars, the bottom of the annular connecting steel bars is sleeved and welded with the groove body steel bars, and the top is welded with the fixing bolts; The bottom surface of the drainage grate cover plate is provided with a safety buckle, the safety buckle has an L-shaped cross section, including a vertical supporting plate and a horizontal clamping claw; the top of the supporting plate is welded with the bottom surface of the drainage grate cover plate, and the clamping claw extends towards the outside of the drainage grate cover plate; the drainage grate base includes a bottom plate and a vertical plate welded on the bottom plate; the bottom plate is installed between the bottom surface of the drainage grate and the safety buckle, and the vertical plate is used for transversely restraining the reinforced concrete layers; when the fixing bolts are loose and the drainage grate cover plate is upwardly jumped by impact, the safety buckle can be engaged with the drainage grate base, so as to vertically limit the drainage grate cover plate.

2. A tunnel integrated cross trenching construction according to claim 1, characterized in that, The thickness of the reinforced concrete layers is equal to the total thickness of the road surface structure surface layer and the road surface structure lower layer.

3. A tunnel integrated cross trenching construction according to claim 1, characterized in that, The steel mesh is welded with the drainage grate base.

4. The tunnel integrated cross trenching construction of claim 1, wherein, A damping rubber pad is arranged between the bottom surface of the drainage grate cover plate and the drainage grate base.

5. The tunnel integrated cross trenching construction of claim 1, wherein, No safety buckle is arranged at both ends and every interval of the drainage grate cover plate in the cross trench.

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