Reinforcing device for shield tunneling machine to pass through existing operating railway bridge in short distance

Abstract

The reinforcing device comprises an existing bridge pile, a reinforcing pile is arranged on the outer side of the existing bridge pile, a reinforced concrete temporary bearing platform is arranged on the reinforcing pile, a steel structure supporting top is arranged on the reinforced concrete temporary bearing platform, and the steel structure supporting top is connected with the existing bridge pile. A jacking structure for jacking the existing operating railway bridge is arranged at the upper end of the steel structure support top, the jacking structure comprises a temporary support, a wedge-shaped steel plate is arranged at the top of the temporary support, and the wedge-shaped steel plate is in contact with a beam web of the existing operating railway bridge. The utility model provides a reinforcing protection measure for the shield to pass through the existing railway bridge at a close distance, so that the upper railway bridge structure can be effectively prevented from being dislocated when the shield passes through, and the safe operation of the existing railway is effectively ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of urban underground facility construction, and particularly relates to a reinforcing device for shield close-range crossing of existing operating railway bridges. BACKGROUND

[0002] With the increasingly rapid development of urban economy, the construction of subways is also developing rapidly, and subways have been built in many large and medium-sized cities in China. The construction of subways will inevitably have a certain degree of impact on densely built-up areas in large cities, and even endanger the safety and use of buildings; in particular, in large cities with complex traffic environment and various viaducts, the situation of subway crossing existing railway bridges is common, which threatens the normal operation of railway bridges. With the development of subway construction, more and more subways will cross under railway bridges, in order to ensure the safety of operation, the existing line is often reduced in speed or stopped, and the original traffic bridge is restored after the shield passes in a stable state. This will affect the normal bridge transportation, in order not to affect the normal operation of the bridge, some protection structures will be added during the shield construction process, but the speed of general high-speed trains is high, and the requirement for settlement is also high, and the existing technology cannot control the deformation in the required range, and the safety risk of railway operation safety cannot be guaranteed. SUMMARY

[0003] The utility model provides a reinforcing device for shield close-range crossing of existing operating railway bridges to solve the problems in the prior art.

[0004] The technical scheme of the utility model is: a reinforcing device for shield close-range crossing of existing operating railway bridges, including existing bridge piles, reinforcing piles are arranged outside the existing bridge piles, a reinforced concrete temporary cap is arranged on the reinforcing piles, a steel structure support is arranged on the reinforced concrete temporary cap, and a jacking structure for jacking the existing operating railway bridge is arranged at the upper end of the steel structure support.

[0005] Further, the jacking structure comprises a temporary support, a wedge-shaped steel plate is arranged at the top of the temporary support, and the wedge-shaped steel plate is in contact with the web plate of the existing operating railway bridge.

[0006] Further, the jacking structure comprises an intelligent jacking device, the intelligent jacking device is vertically arranged, and the telescopic end of the intelligent jacking device jacks the existing operating railway bridge.

[0007] Further, the steel structure support on the reinforced concrete temporary cap is arranged in an inclined manner, and the inclined direction of the steel structure support is inclined towards the lower side of the existing operating railway bridge.

[0008] Further, the steel structure supports on both sides of the existing bridge piles are symmetrically arranged.

[0009] Further, the steel structure support top is connected with the column foot on the reinforced concrete temporary platform through bolts.

[0010] Further, the reinforced concrete temporary platform and the support are connected through bolts.

[0011] Further, the adjacent reinforced concrete temporary platforms are connected through the planted reinforcement and the existing bridge pile platform

[0012] The utility model has the advantages that:

[0013] The utility model provides a kind of reinforcing protection measure for shield close-range underpass existing railway bridge, can effectively guarantee that upper railway bridge structure does not produce dislocation when shield crossing, effectively guarantee existing line safe operation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the working state schematic diagram of the utility model;

[0015] Figure 2 It is the structure schematic diagram of the utility model;

[0016] Figure 3 It is the detail view of existing bridge pile in the utility model;

[0017] Figure 4 It is the connection schematic diagram of reinforcing platform and reinforcing pile in the utility model;

[0018] Figure 5 It is the column foot connection schematic diagram of reinforcing platform and reinforcing pile in the utility model

[0019] Figure 6 It is the planted reinforcement connection schematic diagram of reinforcing platform and existing platform in the utility model

[0020] Wherein:

[0021] 1 reinforcing structure 2 steel structure support top

[0022] 3 reinforced concrete temporary platform 4 intelligent jacking device

[0023] 5 temporary support 6 existing bridge pile

[0024] 7 reinforcing pile 8 wedge-shaped steel plate

[0025] 9 existing bridge pile platform. DETAILED DESCRIPTION

[0026] Below, referring to the drawings and examples, the utility model is explained in detail:

[0027] As Figures 1 to 4As shown, a reinforcement device for a shield machine to cross an existing operating railway bridge at close range includes an existing bridge pile 6, a reinforcement pile 7 is arranged on the outside of the existing bridge pile 6, a reinforced concrete temporary pedestal 3 is arranged on the reinforcement pile 1, a steel structure support top 2 is arranged on the reinforced concrete temporary pedestal 3, and a supporting structure for supporting the existing operating railway bridge is arranged on the upper end of the steel structure support top 2.

[0028] The supporting structure includes a temporary support 5 , which is connected to the top of the steel structure support 2 .

[0029] The supporting structure includes an intelligent jacking device 4, which is vertically arranged at the top of the existing bridge pile 6. The telescopic end of the intelligent jacking device 4 supports the existing operating railway bridge.

[0030] A wedge-shaped steel plate 8 is provided on the top of the temporary support 5 , and the wedge-shaped steel plate 8 is in contact with the web of the beam of the existing railway bridge in operation.

[0031] The steel structure support top 2 on the reinforced concrete temporary foundation 3 is arranged in an inclined direction, and the inclination direction of the steel structure support top 2 is inclined toward the bottom of the existing operating railway bridge.

[0032] The steel structure supports 2 on both sides of the existing bridge piles 6 are arranged symmetrically.

[0033] The steel structure support top 2 is connected to the bolts on the reinforced concrete temporary foundation 3.

[0034] The adjacent reinforced concrete temporary caps 3 are connected to the existing bridge pile caps 9 by planting reinforcement bars.

[0035] Specifically, the temporary support 5 should be a support that is not lower than the existing support of the bridge.

[0036] A method for a shield machine to pass through a reinforcement device of an existing railway bridge at close range comprises the following steps:

[0037] A. Monitor the support reaction forces of existing railway bridges in operation;

[0038] B. Measure the grouting parameters and perform pre-grouting;

[0039] C. Construction reinforcement pile 7;

[0040] D. Construction of reinforced concrete temporary foundation 3;

[0041] E. Construct steel structure support 2 and reinforce it;

[0042] F. Excavate foundation pit and monitor data in real time;

[0043] G. Determine whether it is necessary to completely replace it;

[0044] H. Construction reinforcement foundation;

[0045] I. Remove the reinforced concrete temporary foundation 3 and the steel structure support top 2.

[0046] Specifically, step A monitors the support reaction forces of existing railway bridges in operation. The specific process is as follows:

[0047] First, a PLC intelligent jacking device is installed on the existing bridge pile 6 to tighten the bridge structure. When the bridge pile settles, the intelligent jacking device can be used to increase the jacking force synchronously to ensure that the bridge superstructure does not settle synchronously when the bridge pile and pier settle. Attention should be paid to the reaction force of each support at all times.

[0048] Then, the support reaction force is recorded parametrically.

[0049] Specifically, step B measures the grouting parameters and performs pre-grouting. The specific process is as follows:

[0050] First, the grouting parameters were measured experimentally;

[0051] Then, the affected range of the soil around the pile foundation is determined by the type of pile foundation, and the sand layer (if any) within the affected range of the pile 7 is reinforced by pre-grouting.

[0052] Specifically, step C is to construct the reinforcement pile 7, and the specific process is as follows:

[0053] After the grouting is completed, reinforcement piles 7 are constructed. The bridge dynamics are closely observed during the construction process, and adjustments are made through the PLC intelligent jacking device 4. The grouting process is carried out to avoid grouting disturbance to the existing bridge piles 6.

[0054] Specifically, step D is to construct the reinforced concrete temporary foundation 3, and the specific process is as follows:

[0055] Based on the completed reinforcement piles 7, a reinforced concrete temporary foundation 3 is constructed, and the reinforced concrete temporary foundation 3 serves as a reinforced bottom platform.

[0056] Specifically, step E is to construct the steel structure support 2 and reinforce and tighten it. The specific process is as follows:

[0057] First, a steel structure support 2 is constructed above the reinforced concrete temporary foundation 3;

[0058] Then, the steel structure support 2 uses temporary supports 5 and PLC intelligent jacking device 4 to support the bridge;

[0059] Then, a 10 cm thick wedge-shaped steel plate 8 is used at the bottom of the beam to fill the gap between the temporary support 5 and the bridge, so that the steel structure support top 2 is tightly connected to the bridge.

[0060] Specifically, step F involves excavating a foundation pit and monitoring data in real time. The specific process is as follows:

[0061] The foundation pit is excavated, the integrity of the existing pile cap is checked during excavation, the pile cap is treated if there is any disease, and the pile cap is continuously monitored during construction, including vertical displacement and deformation of the pile cap.

[0062] Specifically, step G determines whether active reinforcement is needed, and the specific process is as follows:

[0063] According to the monitored parameters, when the displacement exceeds the design warning value, the existing structure is actively reinforced. The active reinforcement measures include permanent reinforcement piles and section expansion and anchoring treatment of the existing pile cap. When the calculation result does not meet the bearing capacity requirement, a temporary steel structure support is set to support the existing bridge structure during construction.

[0064] Specifically, step H is to construct the reinforced pile cap, and the specific process is as follows:

[0065] First, the existing pile cap is roughened to expose the reinforcement of the reinforcement pile, which is bent to anchor the reinforcement of the reinforcement pile into the reinforced pile cap. After treatment, the reinforced pile cap is constructed.

[0066] Then, after the construction of the reinforced pile cap is completed, the foundation pit soil is backfilled, the sand layer is pre-grouted, and the tracking grouting pipe is pre-buried.

[0067] Specifically, step I is to remove the reinforced concrete temporary pile cap 3 and the steel structure support 2, and the specific process is as follows:

[0068] First, the reinforced concrete temporary pile cap 3 and the steel structure support 2 are removed.

[0069] Then, during the shield tunneling process, tracking grouting is performed according to the monitoring results.

[0070] Specifically, the reinforcement pile 7 is an 800mm bored pile, the pile bottom is located in the soil-like and block-like strongly weathered stratum, the pile length is 19m~23m, the vertical distance between the pile bottom and the line is 2.86~6m, and the minimum distance on the plane is about 0.3m. Considering the full sleeve tracking hole forming process, the disturbance to the stratum is reduced. During construction, the bridge dynamics are closely monitored, and the PLC intelligent jacking system state is dynamically adjusted according to the monitoring results to ensure the safety of the bridge structure.

[0071] Specifically, the reinforced concrete temporary pile cap 3 is a C35 reinforced concrete structure. The steel structure support 2 is made of Q345qD steel.

[0072] The above is only a preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiment. For those skilled in the art, the improvements and changes obtained without departing from the technical concept of the present application should also be considered as the protection scope of the present application.

Claims

1. A reinforcement device for a shield machine to cross an existing railway bridge at close range, comprising an existing bridge pile (6), characterized in that: A reinforcement pile (7) is provided outside the existing bridge pile (6), a reinforced concrete temporary pedestal (3) is provided on the reinforcement pile (7), a steel structure support (2) is provided on the reinforced concrete temporary pedestal (3), and a supporting structure for supporting the existing operating railway bridge is provided at the upper end of the steel structure support (2).

2. The reinforcement device for a shield machine to cross an existing railway bridge at close range according to claim 1 is characterized by: The supporting structure comprises a temporary support (5), a wedge-shaped steel plate (8) is provided on the top of the temporary support (5), and the wedge-shaped steel plate (8) is in contact with the web of a beam of an existing railway bridge in operation.

3. The reinforcement device for a shield tunneling machine that is used to cross an existing railway bridge at close range according to claim 2 is characterized in that: The supporting structure comprises an intelligent jacking device (4), which is arranged vertically at the top of an existing bridge pile (6), and the telescopic end of the intelligent jacking device (4) supports the existing operating railway bridge.

4. The reinforcement device for a shield machine to cross an existing railway bridge at close range according to claim 1 is characterized by: The steel structure support top (2) on the reinforced concrete temporary foundation (3) is arranged in an inclined manner, and the inclination direction of the steel structure support top (2) is towards the bottom of the existing operating railway bridge.

5. The reinforcement device for a shield machine that is used to cross an existing railway bridge at close range according to claim 1 is characterized in that: The steel structure supports (2) on both sides of the existing bridge piles (6) are symmetrically arranged.

6. The reinforcement device for a shield machine that is used to cross an existing railway bridge at close range according to claim 1 is characterized in that: The steel structure support top (2) is connected to the bracket on the reinforced concrete temporary foundation (3).

7. The reinforcement device for a shield tunneling machine to cross an existing railway bridge at close range according to claim 6, characterized in that: The column foot of the steel structure support top (2) is provided with a plurality of bolts, which are connected to the reinforced concrete temporary support platform (3) by bolts.

8. The reinforcement device for a shield machine that is used to cross an existing railway bridge at close range according to claim 7 is characterized in that: The adjacent reinforced concrete temporary caps (3) are connected to the existing bridge pile caps (9) through embedded reinforcement.

Images