Reinforcing structure for short-distance underpass of municipal aisle and low-clearance bridge

Abstract

The utility model relates to the field of construction reinforcement, and particularly discloses a reinforcing structure for short-distance underpass of a municipal road and a low-clearance bridge, which comprises a plurality of isolation piles, the plurality of isolation piles are vertically arranged on the lower side of the municipal road or the bridge, the top ends of the isolation piles are positioned on the ground, and the lower ends of the isolation piles are lower than the lower side of an excavation area; the crown beams are located at the top ends of the isolation piles; the transverse supports are horizontally arranged, and the two ends of the transverse supports are connected to the connecting positions of the top beams and the isolation piles. According to the scheme, a supporting system is formed among the isolation piles and the cross braces, the rigidity and integrity of soil around an excavation area are integrally improved, soil instability or collapse during excavation is prevented, the pile inclination or fracture risk caused by uneven soil pressure is reduced, the settlement risk of a municipal aisle or a bridge in the excavation process is also reduced, and the safety of the municipal aisle or the bridge is improved. And normal passing of municipal roads or bridges can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to construction reinforcing technical field especially relates to a reinforcing structure of close distance underpass municipal boulevard and low clearance bridge. BACKGROUND

[0002] When shallow-buried tunnel close distance underpass municipal boulevard and urban rail bridge abutment, tunnel in the construction excavation process, it is easy to cause municipal boulevard and abutment nearby earth pressure and construction load change, result in municipal boulevard ground subsidence and abutment inclination;At the same time, municipal boulevard and urban rail bridge on moving load frequently, also can intensify abutment shear deformation risk, further possible to municipal road and rail bridge operation cause interference, easy to interrupt municipal road and rail bridge normal traffic.

[0003] The existing construction scheme mostly is in tunnel open outside before, mostly through adopting pipe curtain grouting construction to reinforce the stratum of excavation area, and adopts non-blasting mode to carry out excavation of excavation area, according to surrounding rock condition, rock mass strength is big, and the whole integrity of working face is good, and adopts hydraulic breaking hammer + periphery shock attenuation hole excavation;Surrounding rock strength is not high, and working face does not need to leave core soil, and can adopt cantilever excavator excavation;Working face enters the reserved upper step core soil of artificial backfilling soil, and adopts excavator + hydraulic breaking hammer + manual cooperation;At the same time, generally, hydraulic breaking hammer is used to excavate tunnel, vibration influence is big, stratum disturbance is sensitive, and it is easy to cause earth pressure redistribution, easy to cause municipal road surface subsidence and abutment inclination, result in municipal boulevard and bridge abutment structure no longer safe and reliable. CONTENT OF UTILITY MODEL

[0004] In view of the deficiencies in the prior art, the utility model provides a reinforcing structure of close distance underpass municipal boulevard and low clearance bridge to solve the problem of high reinforcement cost of low clearance under excavation area when shallow-buried tunnel close distance underpass municipal boulevard and urban rail bridge abutment, and further easy to cause structure instability of municipal boulevard and bridge in excavation area excavation construction.

[0005] In order to achieve the above purpose, the basic scheme of the utility model is as follows: a reinforcing structure of close distance underpass municipal boulevard and low clearance bridge, comprising:

[0006] A plurality of isolation piles, a plurality of isolation piles are vertically arranged under municipal boulevard or bridge, the top end of isolation pile is located on the ground, and the lower end of isolation pile is lower than the lower side of excavation area;

[0007] A plurality of crown beams, crown beams are located on the top end of isolation pile;

[0008] A plurality of cross braces, cross braces are horizontally arranged, and both ends of cross braces are connected to the connection of crown beam and isolation pile.

[0009] The technical principle of the utility model is: the several isolation piles can be deeply into the stratum, block and support the excavation area, the crown beam and the cross brace can reinforce the top of the municipal road or the low clearance range under the bridge; when the excavation area is excavated, the isolation pile is used as the vertical retaining structure, bears the lateral earth pressure, limits the horizontal displacement of the soil, the cross brace and the cross brace are used as the horizontal constraint, connect the isolation piles into a whole, form the "pile-brace" frame structure, form the support system among the isolation piles, the cross brace and the cross brace, improve the rigidity and integrity of the soil around the excavation area as a whole, prevent the soil instability or collapse during the excavation, reduce the risk of the pile body inclination or fracture caused by the uneven earth pressure, also reduce the settlement risk of the municipal road or the bridge during the excavation process, ensure that the municipal road or the bridge can be normally passed.

[0010] Further, the isolation pile comprises:

[0011] The pile hole is arranged on the underside of the municipal road or the bridge.

[0012] The annular lock port is arranged at the top of the pile hole.

[0013] The several annular retaining wall segments are fixedly connected with the inner wall of the pile hole, and the outer walls of the several retaining wall segments are coaxially arranged in the pile hole from the lower end of the lock port to the upper end.

[0014] The several sectional pile body reinforcement cages are arranged in the pile hole.

[0015] The pile body concrete can be poured into the pile hole with the pile body reinforcement cage.

[0016] Through the above arrangement, the lock port and the retaining wall segment can provide support and protection for the segmented excavation of the pile hole, so that the pile hole can be smoothly excavated; at the same time, the sectional pile body reinforcement cage is convenient for being transferred to the low-clearance municipal road or the bridge below for hoisting, connecting and lowering construction, so that the pile body reinforcement cage can be accurately and quickly installed into the pile hole, reducing the construction difficulty of the isolation pile under the low clearance, and improving the construction efficiency.

[0017] Further, the upper end of the lock port is higher than the ground by a distance of ≥30cm.

[0018] Through the above arrangement, the part of the lock port higher than the ground forms a water retaining structure, ensures that the ground water does not flow into the pile hole, makes the construction environment in the pile hole better, and makes the pile hole can be quickly formed.

[0019] Further, the top of the isolation pile is located on the ground.

[0020] Through the above setting, the upper end of the isolation pile is convenient to isolate the subsequent construction of the cross brace and the cross brace, and the connection between the isolation pile, the cross brace and the cross brace is more close.

[0021] Further, a part of the isolation piles are first column isolation piles arranged, and the rest of the isolation piles are second column isolation piles arranged, the first column isolation piles are arranged opposite to the second column isolation piles, the first column isolation piles are located on one side of the excavation area, and the first column isolation piles are located on the other side of the excavation area.

[0022] Through the above setting, the first column isolation piles and the second column isolation piles are arranged on the two sides of the excavation area correspondingly, the two sides of the excavation area can be fully reinforced, and the soil structure strength of the excavation area is obviously improved.

[0023] Further, the crown beam is provided with crown beam reinforcement, the cross brace is provided with cross brace reinforcement, and the end of the cross brace reinforcement, the crown beam reinforcement and the pile body reinforcement cage at the top of the isolation pile are embedded and bound with each other.

[0024] Through the above setting, the crown beam reinforcement and the cross brace reinforcement are precisely bound and embedded with the pile body reinforcement cage, so that the structure between the final crown beam, the cross brace and the isolation pile is more close and reliable.

[0025] Further, the upper ends of the plurality of isolation piles can be located on the same horizontal plane.

[0026] Through the above setting, the crown beam and the cross brace are more convenient to horizontally connect two isolation piles, and the construction difficulty of the crown beam and the cross brace is reduced.

[0027] Further, the cross brace and the ground are provided with a filling layer and a concrete layer arranged in sequence from bottom to top.

[0028] Through the above setting, the gap between the cross brace and the ground can be filled and reinforced, and the filling layer and the concrete layer can also provide a more flat ground when the cross brace is constructed, so that the construction of the cross brace and the crown beam is more convenient.

[0029] Further, the thickness of the lock opening is greater than that of the wall protection section, and the inner wall of the lock opening is coplanar with the inner wall of the wall protection section.

[0030] Through the above setting, the lock opening and the wall protection section are precisely matched, the pile hole is more precise in the sectional excavation, and the wall protection section is also more precise and reliable in forming. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view in the overhead direction of the reinforcing structure for close-range underpass of the municipal road and the low-clearance bridge in the embodiment of the utility model.

[0032] Figure 2The utility model discloses a reinforcing structure for close-range underpass of municipal road and low-clearance bridge.

[0033] Figure 3 The utility model discloses a reinforcing structure for close-range underpass of municipal road and low-clearance bridge.

[0034] Figure 4 For Figure 3 The enlarged view of the lock mouth.

[0035] In the above drawing: municipal road 1, bridge 2, isolation pile 30, first column isolation pile 301, second column isolation pile 302, crown beam 40, cross brace 50, pile hole 601, lock mouth 602, guard wall section 603, pile body reinforcement cage 604, pile body concrete 605, filling layer 701, concrete layer 702. DETAILED DESCRIPTION

[0036] The technical scheme in the utility model will be further explained below in connection with the drawings and embodiments.

[0037] The embodiment is basically as shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 The utility model discloses a reinforcing structure for close-range underpass of municipal road and low-clearance bridge, comprising eight isolation piles 30, eight crown beams 40 and a plurality of cross braces 50, as shown in Figure 1 and Figure 3 Eight isolation piles 30 are vertically arranged under the lower side of municipal road 1 or bridge 2, the top end of isolation pile 30 is located on the ground, and the lower end of isolation pile 30 is lower than the lower side of the excavation area.

[0038] As shown in Figure 1 Four isolation piles 30 are arranged to form first column isolation pile 301, and the remaining four isolation piles 30 are divided into second column isolation pile 302, first column isolation pile 301 and second column isolation pile 302 are arranged in parallel, and first column isolation pile 301 and second column isolation pile 302 are arranged oppositely, first column isolation pile 301 is located on the upper side of the excavation area, and first column isolation pile 301 is located on the lower side of the excavation area, the isolation piles 30 in first column isolation pile 301 and second column isolation pile 302 are numbered continuously from left to right, the isolation piles 30 numbered 2# and 4# in first column isolation pile 301 are constructed at the same time, and the isolation piles 30 numbered 5# and 7# in second column isolation pile 302 are constructed at the same time, after the isolation piles 30 numbered 2#, 4#, 5# and 7# are constructed, the remaining isolation piles 30 are constructed at the same time, and interval pile construction of isolation pile 30 is realized.

[0039] At the same time, as shown in Figure 3and Figure 4 As shown in the drawings, the isolation pile 30 comprises a pile hole 601, a ring-shaped lock mouth 602, a plurality of ring-shaped wall protection segments 603, a plurality of segmented pile body reinforcement cages 604 and pile body concrete 606. The overall length of the isolation pile 30 is 22 m. The pile hole 601 is arranged at the lower side of the municipal road 1 or the bridge 2. The diameter of the pile hole 601 is 150 cm. The minimum horizontal distance between the pile hole 601 and the adjacent municipal road 1 or the lower abutment of the bridge 2 is ≥ 120 cm. The lock mouth 602 is located at the top end of the pile hole 601. The thickness of the lock mouth 602 is 25 cm. The part of the lock mouth 602 above the ground is ≥ 30 cm, which ensures that the ground water does not flow into the pile hole 601. The overall depth of the lock mouth 602 is 200 cm. The lock mouth 602 is provided with lock mouth 602 reinforcement. When pouring concrete into the lock mouth 602, layered pouring is adopted. The pouring thickness of each layer is ≤ 30 cm. An inserted vibration rod is used for vibration to ensure the compactness of the concrete. When the pile hole 601 is excavated, segmented excavation is adopted. The segmented excavation height of the pile hole 601 is 50-200 cm. According to the segments of the pile hole 601, ring-shaped wall protection reinforcement is installed at the inner wall of the pile hole 601 at the segment. Wall protection segments 603 are formed by pouring concrete at the wall protection reinforcement to be fixed to the inner wall of the pile hole 601. The plurality of wall protection segments 603 are coaxially arranged in the pile hole 601 from the lower end of the lock mouth 602 upwards. When the installation environment of the wall protection reinforcement is soft soil or abundant underground water, a plurality of stiffening channel steels are welded on the wall protection reinforcement. The stiffening channel steels are spaced 5 m apart. A wall protection concrete formwork is laid and installed outside the wall protection reinforcement. The wall protection concrete formwork is a steel formwork. The wall protection concrete formwork is located at the inner wall of the wall protection reinforcement. When facing soft soil or abundant underground water, a channel steel, an I-beam or a steel pipe is used to install the steel formwork to a temporary support to improve the installation strength of the steel formwork and the wall protection reinforcement. Then, C20 reinforced concrete is poured between the wall protection concrete formwork and the inner wall of the pile hole 601. The concrete forms the wall protection segments 603 after solidification. The thickness of the wall protection segments 603 is 20 cm. The inner wall of the wall protection segments 603 is coplanar with the inner wall of the lock mouth 602.

[0040] Meanwhile, the height of the single pile body reinforcement cage 604 is less than the distance between the lower surface of the beam body of the municipal road 1 or the rail transit bridge 2 and the ground, and in the embodiment, the height of the single pile body reinforcement cage 604 is 3.5 m, the pile body reinforcement cage 604 is made of HRB400 grade steel, the vertical main reinforcement is φ28 mm with a spacing of 28 cm, the stirrup is φ20 mm with a spacing of 20 cm and a spacing of 1.50 cm, and the reinforcing stirrup is φ20 mm with a spacing of 5 m; a straight thread sleeve is connected between the adjacent two pile body reinforcement cages 604, a formwork is installed at the pile body reinforcement cage 604 located outside the pile hole 601, the pile body concrete 606 can be poured into the pile hole 601 provided with the pile body reinforcement cage 604, the pile body concrete 606 of the isolation pile 30 is formed by one-time pouring, the concrete in the pile hole 601 is solidified to form the isolation pile 30, and the pile body concrete 606 in the pile hole 601 is vibrated in layers during pouring, the thickness of each layer is ≤30 cm, so that after the isolation pile 30 is formed, the top of the isolation pile 30 is located outside the pile hole 601, facilitating cooperation with the subsequent corbel beam 40 and cross brace 50.

[0041] As shown in Figure 2 , the corbel beam 40 is located at the top end of the isolation pile 30; the cross brace 50 is horizontally arranged, and the two ends of the cross brace 50 are connected to the connection between the corbel beam 40 and the isolation pile 30, the corbel beam 40 is provided with corbel beam 40 reinforcement, the cross brace 50 is provided with cross brace 50 reinforcement, the end of the cross brace 50 reinforcement, the corbel beam 40 reinforcement and the pile body reinforcement cage 604 at the top of the isolation pile 30 are embedded and tied with each other, and the cross brace 50 and the ground are provided with a filling layer 701 and a concrete layer 702 arranged from bottom to top; after the mold is installed and the concrete is poured, the horizontally layered poured concrete is arranged between the corbel beam 40 formwork and the cross brace 50 side mold, the thickness of each layer of concrete is ≤30 cm, the width of the corbel beam 40 is 150 cm, and the height is 95 cm after the corbel beam 40 and the cross brace 50 are integrally formed; the width of the cross brace 50 is 60 cm, and the height is 80 cm.

[0042] In the construction of the reinforcement structure of the present embodiment, when the lock opening 602 is constructed, the lock opening 602 adopts a double-layered steel mesh and a layered pouring process, and a seepage prevention structure 30 cm higher than the ground is arranged, which effectively prevents the collapse of the pile hole 601 and the infiltration of underground water, guarantees the stability of the subsequent pile hole 601 excavation, and reduces the influence on the municipal road 1 or the bridge 2; the first row of isolation piles 301 and the second row of isolation piles 302 are constructed in two rows, and the jump pile construction is adopted, and the isolation piles 30 numbered 2# and 4# in the first row of isolation piles 301 are constructed at the same time, and the isolation piles 30 numbered 5# and 7# in the second row of isolation piles 302 are constructed at the same time, so that when the pile hole 601 is constructed, the four pile holes 601 have enough spacing when constructed at the same time, the strength of the ground is less affected by the pile hole 601 construction, the influence on the municipal road 1 and the rail transit bridge 2 is reduced, the simultaneous construction efficiency of the four pile holes 601 is improved, the stress superposition effect between the adjacent isolation piles 30 is reduced, the final settlement difference of the isolation piles 30 is controlled within 5 mm, the construction precision of the isolation piles 30 is improved, and the strength of the isolation piles 30 can be effectively guaranteed; the relatively low crown beam 40 and the cross brace 50 are also convenient to arrange under the low-clearance municipal road 1 or the bridge 2, so that the installation and construction of the entire reinforcement structure are relatively convenient, and the construction efficiency is high.

[0043] When the reinforcement structure is constructed, the isolation piles 30 can cooperate with the cross braces 50 and the cross braces 50 to reinforce the excavation area located between the isolation piles 30. When the excavation area is excavated in the subsequent construction process, a support system is formed between the isolation piles 30, the cross braces 50 and the cross braces 50. The isolation piles 30 act as vertical retaining structures to withstand lateral earth pressure and limit horizontal displacement of the soil. The cross braces 50 and the cross braces 50 act as horizontal constraints to connect the isolation piles 30 into a whole, forming a "pile-brace" frame structure to balance the earth pressure on both sides. At the same time, the isolation piles 30 form a "pre-tightening" state through the pre-axial force of the cross braces 50, which improves the stiffness and integrity of the soil around the excavation area as a whole, prevents soil instability or collapse during excavation, and reduces the risk of pile inclination or fracture caused by uneven soil pressure.

[0044] At the same time, in soft soil, high water level or sensitive stratum, the cooperation of the isolation piles 30 and the cross braces 50 can effectively resist seepage pressure and soil liquefaction, ensure the safety and continuity of excavation operations in complex stratum, and facilitate low-cost and high-efficiency reinforcement structure construction under low-clearance municipal roads 1 or bridges 2.

[0045] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application. The technical solutions of the present application should be covered in the scope of the claims of the present application.

Claims

1. A reinforcement structure for passing under a municipal avenue and a low-clearance bridge at close range, characterized in that, include: A number of isolation piles are vertically installed under the municipal avenue or bridge, with the top of the isolation piles above the ground and the bottom of the isolation piles below the excavation area. Several cap beams, said cap beams being located on top of the isolation piles; Several horizontal braces are provided, with both ends of the braces connected to the connection between the cap beam and the isolation pile.

2. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 1, characterized in that, The isolation piles include: Piling holes, which are located under municipal avenues or bridges; A ring-shaped locking opening is located at the top of the pile hole; Several annular retaining wall segments are provided, the outer wall of which is fixedly connected to the inner wall of the pile hole. The retaining wall segments are arranged coaxially from top to bottom in the pile hole from the lower end of the locking opening. Several segmented pile reinforcement cages, the height of a single pile reinforcement cage being less than the numerical distance between the lower surface of the beam of a municipal avenue or rail transit bridge and the ground, and several pile reinforcement cages being assembled and installed in the pile hole. The pile body concrete can be poured into the pile hole containing the pile body reinforcement cage.

3. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 2, characterized in that, The upper end of the lock is ≥30cm above the ground.

4. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 3, characterized in that, The top of the isolation pile is located on the ground.

5. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 4, characterized in that, Some of the isolation piles are arranged in the first row, and the remaining isolation piles are arranged in the second row. The first row and the second row of isolation piles are set opposite to each other. The first row of isolation piles is located on one side of the excavation area, and the second row of isolation piles is located on the other side of the excavation area.

6. A reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in any one of claims 1-5, characterized in that, The capping beam contains capping beam reinforcement, and the cross brace contains cross brace reinforcement. The ends of the cross brace reinforcement, the capping beam reinforcement, and the pile body reinforcement cage at the top of the isolation pile are interlocked and tied together.

7. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 1, characterized in that, The upper ends of several of the isolation piles may be located on the same horizontal plane.

8. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 7, characterized in that, Between the cross brace and the ground, a leveling layer and a concrete layer are arranged sequentially from bottom to top.

9. The reinforcement structure for a short-distance underpass of a municipal avenue and a low-clearance bridge as described in claim 8, characterized in that, The thickness of the lock opening is greater than the thickness of the protective wall section, and the inner wall of the lock opening is coplanar with the inner wall of the protective wall section.

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