Temporary supporting device for incremental launching construction of soft soil foundation bridge

Abstract

The utility model provides a temporary support device for soft soil foundation bridge incremental launching construction, which comprises a temporary support structure arranged between permanent pier structures, the temporary support structure comprises a horizontal support I connected to the top of the permanent pier structure and a horizontal support II connected to the bottom of the permanent pier structure, a vertical support is arranged between the first horizontal support and the second horizontal support. The vertical support component is supported on the second horizontal support attached to the ground, the contact area of the vertical support and the ground is increased equivalently, when the vertical support sinks, a vertically upward supporting force is provided for the vertical support, and in order to further improve the bearing capacity of the vertical support component, the vertical support component is supported by the second horizontal support. The two sides of the second horizontal support are supported at the positions of the left bearing platform and the right bearing platform which are large in rigidity, the second horizontal support, the ground, the bearing platforms and the vertical support work cooperatively, and therefore sedimentation of the vertical support is effectively limited, the sedimentation amount of the vertical support is within a controllable range, and the construction quality is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, in particular to a temporary supporting device used for the top-pushing construction of a bridge on a soft soil foundation. Background Art

[0002] Pushing construction is to push the bridge structure to the designated position through the guide beam, jack and sliding system. It has the advantages of simple construction, high safety and little impact on the existing traffic. It is widely used in bridge engineering construction, such as Figure 1 As shown, the steps of jacking construction are as follows: set up temporary supports and working platforms, assemble beam bodies and guide beams; connect guide frames to guide beams; jack up into place; remove guide beams, drop beams, and remove temporary facilities.

[0003] The top-pushing construction requires the erection of temporary supports, but due to the uneven engineering geological conditions, it is easy to encounter soft soil foundations. The bearing capacity of soft soil foundations is relatively small. If temporary supports are erected on soft soil foundations, they will be subjected to the upper load, which will cause a large settlement of the foundation and the support. At this time, it is difficult for the temporary supports to support the upper structure, which is a major problem faced by the construction.

[0004] For example, the construction system of a large-tonnage cast-in-place box girder on a soft soil foundation disclosed in the Chinese utility model patent with authorization announcement number CN204475195U includes a supporting pile portion, a scaffolding and a prefabricated beam formwork, wherein the supporting pile portion includes a plurality of supporting piles arranged in an array and driven into the original soft soil foundation, a scissors brace provided on the exposed bottom surface of the supporting piles, a supporting frame fixedly provided on the top of the supporting piles, and square timbers laid on the supporting frame to form a platform, the scaffolding is erected on the platform, and the top beam formwork is erected on the scaffolding.

[0005] In the above prior art, the supporting pile system is combined with the scaffolding system, but there are the following problems:

[0006] 1. Several support piles and scissor braces need to be set between the column spans, and only when there are enough of them can the support be effective;

[0007] 2. The driving of each support pile takes a long time, and the height of the support pile protruding from the ground needs to be accurately controlled to make each support pile have the same height, which is difficult, time-consuming and labor-intensive;

[0008] 3. The scissors struts are supported on the upper part of the supporting piles, which undoubtedly increases the weight of the supporting piles. For soft soil foundations, it increases the difficulty of support.

[0009] Therefore, how to effectively simplify the support structure while enhancing the support effect is a technical problem that needs to be solved urgently. Utility Model Content

[0010] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a temporary support device for the jacking construction of a bridge on a soft soil foundation, which solves the problems of complex support structure and poor support effect.

[0011] The technical solution of this application is:

[0012] A temporary support device for top-pushing construction of a bridge on a soft soil foundation comprises a temporary support structure arranged between permanent pier structures, the temporary support structure comprises a horizontal support 1 connected to the top of the permanent pier structure, a horizontal support 2 connected to the bottom of the permanent pier structure, and a vertical support is arranged between the horizontal support 1 and the horizontal support 2. By supporting the vertical support member on the horizontal support 2 that fits the ground, it is equivalent to increasing the contact area between the vertical support and the ground. When the vertical support sinks, it will give the vertical support a vertical upward support force, and in order to further improve its bearing capacity, the two sides of the horizontal support 2 are supported at two left and right pedestal positions with greater rigidity. The horizontal support 2, the ground, the pedestal and the vertical support work together, thereby effectively limiting the settlement of the vertical support, so that the settlement of the vertical support is within a controllable range, ensuring the construction quality; the horizontal support 1 and the horizontal support 2 give the bridge continuous lateral support force, and the vertical support gives the bridge continuous vertical support force, forming an I-shaped support, which has a large contact area with the ground, effectively sharing the pressure of the bridge, and reducing the settlement of the temporary support structure.

[0013] Furthermore, the permanent pier structure includes a connected pedestal and pier columns, the upper surface of the pedestal is flush with the ground, and the second horizontal support is overlapped above the pedestal to avoid foundation treatment, saving cost and time.

[0014] Furthermore, a pad is provided between the second horizontal support and the pier column.

[0015] Furthermore, the pad includes an elastic pad to prevent the horizontal force component generated during the jacking process from causing local damage to the concrete of the pier column.

[0016] Furthermore, a cap beam is connected to the top of the pier column, a steel beam 1 is arranged between the cap beam and the horizontal support 1, and a steel beam 2 is arranged between the vertical support and the horizontal support 1.

[0017] Furthermore, the temporary support structure includes an H-shaped bracket, and a diagonal brace is arranged inside the H-shaped bracket to enhance the stability of the temporary support structure.

[0018] Furthermore, the bottom of the H-shaped bracket is welded to the second horizontal support to improve the structural integrity.

[0019] Furthermore, an ear plate is provided at the bottom of the H-shaped bracket, and the screws pass through the ear plate and the second horizontal support in sequence and cooperate with the nut thread, which is convenient for installation, disassembly and transportation.

[0020] Furthermore, an anti-slip strip is provided on the lower surface of the second horizontal support to prevent the second horizontal support from being displaced during the pushing process, thereby increasing the friction between the second horizontal support and the support platform.

[0021] Furthermore, the side surfaces of the pedestal are roughened, which increases the friction between the pedestal and the foundation soil, and also increases the friction between the pedestal and the second horizontal support.

[0022] The specific beneficial effects of the utility model include:

[0023] 1. By supporting the vertical support member on the horizontal support 2 that is attached to the ground, the contact area between the vertical support and the ground is increased. When the vertical support sinks, it will give the vertical support a vertical upward support force. In order to further improve its bearing capacity, the two sides of the horizontal support 2 are supported on the left and right capping platforms with greater rigidity. The horizontal support 2, the ground, the capping platform and the vertical support work together to effectively limit the settlement of the vertical support, so that the settlement of the vertical support is within a controllable range, ensuring the construction quality;

[0024] 2. Horizontal support 1 and horizontal support 2 provide continuous lateral support force to the bridge, and vertical support provides continuous vertical support force to the bridge, forming an I-shaped support with a large contact area with the ground, effectively sharing the pressure of the bridge and reducing the settlement of the temporary support structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the steps of top-pushing construction in the background technology of the utility model;

[0027] Figure 2 This is a schematic diagram of the use state of Example 1 of the utility model;

[0028] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0029] Figure 4 This is a schematic diagram of the usage status of Example 3 of the utility model.

[0030] Description of Figure Numbers:

[0031] 1. Permanent pier structure; 2. Temporary support structure;

[0032] 3. Horizontal support one; 4. Horizontal support two; 5. Vertical support;

[0033] 11. Capping platform; 12. Pier column; 13. Pad plate; 14. Cap beam;

[0034] 15. Steel beam one; 16. Steel beam two. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Example 1, a temporary support device for bridge jacking construction on soft soil foundation, such as Figure 2 As shown, it includes a temporary support structure 2 arranged between permanent pier structures 1, and the temporary support structure 2 includes a horizontal support 1 3 connected to the top of the permanent pier structure 1, and a horizontal support 2 4 connected to the bottom of the permanent pier structure 1, and a vertical support 5 is arranged between the horizontal support 1 3 and the horizontal support 2 4. By supporting the vertical support 5 on the horizontal support 2 4 that is in contact with the ground, it is equivalent to increasing the contact area between the vertical support 5 and the ground. When the vertical support 5 sinks, it will give the vertical support 5 a vertical upward supporting force, and in order to further improve its bearing capacity, the two sides of the horizontal support 2 4 are supported on the left and right sides of the two pedestals 11 with greater rigidity. The horizontal support 2 4, the ground, the pedestal 11 and the vertical support 5 work together to effectively limit the settlement of the vertical support 5, so that the settlement of the vertical support 5 is within a controllable range, ensuring the construction quality; the horizontal support 1 3 and the horizontal support 2 4 give the bridge continuous lateral supporting force, and the vertical support 5 gives the bridge continuous vertical supporting force, forming an I-shaped support with a large contact area with the ground, effectively sharing the pressure of the bridge and reducing the settlement of the temporary support structure 2.

[0037] Based on the above implementation, Figure 3 As shown, the permanent pier structure 1 includes a connected pedestal 11 and a pier column 12 , the upper surface of the pedestal 11 is flush with the ground, and the horizontal support 2 4 is overlapped above the pedestal 11 .

[0038] Specifically, if the settlement of the temporary support structure 2 is to be controlled, the bearing capacity of the soft soil foundation can be improved by foundation treatment. However, this method requires a large investment, and the project cost is too high for temporary facilities such as construction scaffolding, so it is not the preferred option. Therefore, a group of Bailey beams are placed at the bottom of the temporary support structure 2 and its two sides are supported at the positions of the left and right permanent pier caps to avoid foundation treatment and save cost and time.

[0039] On the basis of the above-mentioned implementation mode, a pad 13 is arranged between the horizontal support 2 4 and the pier 12, and the pad 13 includes an elastic pad, preferably a wooden pad. The structure size of the pedestal 11 is relatively large, and the vertical pressure transmitted by the horizontal support 2 4 is much smaller than the compressive strength of the concrete of the pedestal 11 itself, and the contact surface between the horizontal support 2 4 and the left and right pedestals 11 is relatively large, so no protective measures are required, and the horizontal support 2 4 is directly supported on the pedestal 11. In addition, a wooden pad should be placed vertically between the horizontal support 2 4 and the pier 12 to avoid the horizontal component force generated during the jacking process causing local damage to the concrete of the pier 12.

[0040] On the basis of the above-mentioned implementation mode, a cap beam 14 is connected to the top of the pier 12, a steel beam 15 is arranged between the cap beam 14 and the horizontal support 1 3, and a steel beam 2 16 is arranged between the vertical support 5 and the horizontal support 1 3.

[0041] Specifically, the steel beam 15 and the steel beam 2 6 are made of I-beams.

[0042] On the basis of the above-mentioned implementation mode, the temporary support structure 2 includes an H-shaped bracket, and a diagonal brace is arranged inside the H-shaped bracket to enhance the stability of the temporary support structure 2 .

[0043] On the basis of the above implementation, in order to prevent the H-shaped bracket from sliding in the horizontal direction during the pushing process, the bottom of the H-shaped bracket and the horizontal support 2 4 are welded to improve the structural integrity.

[0044] On the basis of the above embodiment, an anti-slip strip is provided on the lower surface of the horizontal support 24, and the horizontal support 24 is overlapped on the base 11. The anti-slip strip can prevent the horizontal support 24 from being displaced during the pushing process to a certain extent, thereby increasing the friction between the horizontal support 24 and the base 11.

[0045] On the basis of the above-mentioned implementation mode, the side surfaces of the said support platform 11 are all roughened surfaces, which increases the friction between the said support platform 11 and the foundation soil, and also increases the friction between the said support platform 11 and the said horizontal support 2 4 .

[0046] Preferably, the horizontal support 1 3 and the horizontal support 2 4 both adopt Bailey beams. If there is no such set of Bailey beams, as the construction of the upper bridge progresses and the weight of the upper beam increases, the pressure on the temporary support will continue to increase. Since the soft soil foundation below has a small rigidity, this will cause the support to sink significantly, and eventually cause the upper beam to sag, which will fail to meet the construction requirements. By supporting the vertical support 5 on the horizontal support 2 4 that is in contact with the ground, it is equivalent to increasing the contact area between the vertical support 5 and the ground. When the vertical support 5 sinks, it will give the vertical support 5 a vertical upward supporting force, and in order to further improve its bearing capacity, the two sides of the horizontal support 2 4 are supported on the left and right sides of the two pedestals 11 with greater rigidity. The horizontal support 2 4, the ground, the pedestal 11 and the vertical support 5 work together to effectively limit the settlement of the vertical support 5, so that the settlement of the vertical support 5 is within a controllable range, ensuring the construction quality; the horizontal support 1 3 and the horizontal support 2 4 give the bridge continuous lateral supporting force, and the vertical support 5 gives the bridge continuous vertical supporting force, forming an I-shaped support with a large contact area with the ground, effectively sharing the pressure of the bridge and reducing the settlement of the temporary support structure 2.

[0047] Example 2, as a preferred embodiment of a temporary support device for jacking construction of a bridge on a soft soil foundation, is different from Example 1 in that it includes a temporary support structure 2 arranged between permanent pier structures 1, and the temporary support structure 2 includes a horizontal support 1 3 connected to the top of the permanent pier structure 1, and a horizontal support 2 4 connected to the bottom of the permanent pier structure 1, and a vertical support 5 is arranged between the horizontal support 1 3 and the horizontal support 2 4. By supporting the vertical support 5 on the horizontal support 2 4 that is in contact with the ground, it is equivalent to increasing the contact area between the vertical support 5 and the ground. When the vertical support 5 sinks, it will give the vertical support 5 a vertical upward supporting force, and in order to further improve its bearing capacity, the two sides of the horizontal support 2 4 are supported on the left and right sides of the two pedestals 11 with greater rigidity. The horizontal support 2 4, the ground, the pedestal 11 and the vertical support 5 work together to effectively limit the settlement of the vertical support 5, so that the settlement of the vertical support 5 is within a controllable range, ensuring the construction quality; the horizontal support 1 3 and the horizontal support 2 4 give the bridge continuous lateral supporting force, and the vertical support 5 gives the bridge continuous vertical supporting force, forming an I-shaped support with a large contact area with the ground, effectively sharing the pressure of the bridge and reducing the settlement of the temporary support structure 2.

[0048] Based on the above implementation, Figure 3 As shown, the permanent pier structure 1 includes a connected pedestal 11 and a pier column 12 , the upper surface of the pedestal 11 is flush with the ground, and the horizontal support 2 4 is overlapped above the pedestal 11 .

[0049] Specifically, if the settlement of the temporary support structure 2 is to be controlled, the bearing capacity of the soft soil foundation can be improved by foundation treatment. However, this method requires a large investment, and the construction cost is too high for temporary facilities such as construction scaffolds, so it is not the preferred option. Therefore, a group of Bailey beams are placed at the bottom of the temporary support structure 2 and its two sides are supported at the left and right permanent pier caps to avoid foundation treatment.

[0050] On the basis of the above-mentioned implementation mode, a pad 13 is arranged between the horizontal support 2 4 and the pier 12, and the pad 13 includes an elastic pad, preferably a wooden pad. The structure size of the pedestal 11 is relatively large, and the vertical pressure transmitted by the horizontal support 2 4 is much smaller than the compressive strength of the concrete of the pedestal 11 itself, and the contact surface between the horizontal support 2 4 and the left and right pedestals 11 is relatively large, so no protective measures are required, and the horizontal support 2 4 is directly supported on the pedestal 11. In addition, a wooden pad should be placed vertically between the horizontal support 2 4 and the pier 12 to avoid the horizontal component force generated during the jacking process causing local damage to the concrete of the pier 12.

[0051] On the basis of the above-mentioned implementation mode, a cap beam 14 is connected to the top of the pier 12, a steel beam 15 is arranged between the cap beam 14 and the horizontal support 1 3, and a steel beam 2 16 is arranged between the vertical support 5 and the horizontal support 1 3.

[0052] Specifically, the steel beam 15 and the steel beam 2 6 are made of I-beams.

[0053] On the basis of the above-mentioned implementation mode, the temporary support structure 2 includes an H-shaped bracket, and a diagonal brace is arranged inside the H-shaped bracket to enhance the stability of the temporary support structure 2 .

[0054] On the basis of the above implementation, an ear plate is provided at the bottom of the H-shaped bracket, and the screws pass through the ear plate and the horizontal support 4 in sequence and cooperate with the nut thread, which is convenient for installation, disassembly and transportation.

[0055] On the basis of the above embodiment, an anti-slip strip is provided on the lower surface of the horizontal support 24, and the horizontal support 24 is overlapped on the base 11. The anti-slip strip can prevent the horizontal support 24 from being displaced during the pushing process to a certain extent, thereby increasing the friction between the horizontal support 24 and the base 11.

[0056] On the basis of the above-mentioned implementation mode, the side surfaces of the pedestal 11 are all roughened surfaces, which increases the friction between the pedestal 11 and the foundation soil, and also increases the friction between the pedestal 11 and the horizontal support 2 4 .

[0057] Preferably, the horizontal support 1 3 and the horizontal support 2 4 both adopt Bailey beams. If there is no such set of Bailey beams, as the construction of the upper bridge progresses and the weight of the upper beam increases, the pressure on the temporary support will continue to increase. Since the soft soil foundation below has a small rigidity, this will cause the support to sink significantly, and eventually cause the upper beam to sag, which will fail to meet the construction requirements. By placing the vertical support 5 component on the horizontal support 2 4 that is in contact with the ground, it is equivalent to increasing the contact area between the vertical support 5 and the ground. When the vertical support 5 sinks, it will give the vertical support 5 a vertical upward supporting force, and in order to further improve its bearing capacity, the two sides of the horizontal support 2 4 are supported on the left and right two pedestals 11 with greater rigidity. The horizontal support 2 4, the ground, the pedestal 11 and the vertical support 5 work together to effectively limit the settlement of the vertical support 5, so that the settlement of the vertical support 5 is within a controllable range, ensuring the construction quality; the horizontal support 1 3 and the horizontal support 2 4 give the bridge continuous lateral supporting force, and the vertical support 5 gives the bridge continuous vertical supporting force, forming an I-shaped support with a large contact area with the ground, effectively sharing the pressure of the bridge and reducing the settlement of the temporary support structure 2.

[0058] Example 3 is a preferred implementation of a temporary support device for top-pushing construction of bridges on soft soil foundations. In Example 1 and Example 2, the construction operation platform has poor site conditions in only one span in the middle, and the temporary support of the span adopts a single-span horizontal support 1 3 arrangement, and supports both sides of the horizontal support 2 4 at the positions of the left and right permanent pier caps 11; the difference between Example 3 and Example 1 and Example 2 is that if the construction operation platform has multiple spans with poor site conditions, it can be adopted Figure 4 As shown, continuous horizontal support one 3 and horizontal support two 4 are arranged.

[0059] The method of using the utility model is as follows:

[0060] 1. Install temporary support structure 2 between permanent pier structures 1;

[0061] 2. Carry out top-pushing construction and slide the beam along the horizontal support 1-3;

[0062] 3. After the beam is pushed into place, remove the temporary supporting structure 2.

[0063] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0064] The above content shows and describes the basic principle, main features and beneficial effects of the utility model. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A temporary support device for bridge jacking construction on soft soil foundation, characterized in that: The invention comprises a temporary support structure (2) arranged between permanent pier structures (1), wherein the temporary support structure (2) comprises a first horizontal support (3) connected to the top of the permanent pier structure (1), and a second horizontal support (4) connected to the bottom of the permanent pier structure (1), and a vertical support (5) is arranged between the first horizontal support (3) and the second horizontal support (4).

2. The temporary support device for bridge jacking construction on soft soil foundation according to claim 1 is characterized in that: The permanent pier structure (1) comprises a connected pedestal (11) and a pier column (12); the upper surface of the pedestal (11) is flush with the ground, and the second horizontal support (4) is overlapped above the pedestal (11).

3. The temporary support device for bridge jacking construction on soft soil foundation according to claim 2 is characterized in that: A pad (13) is provided between the second horizontal support (4) and the pier column (12).

4. The temporary support device for bridge jacking construction on soft soil foundation according to claim 3 is characterized in that: The pad (13) comprises an elastic pad.

5. The temporary support device for jacking construction of a bridge on soft soil foundation according to any one of claims 2 to 4, characterized in that: A cap beam (14) is connected to the top of the pier column (12), a steel beam (15) is arranged between the cap beam (14) and the horizontal support (3), and a steel beam (2) (16) is arranged between the vertical support (5) and the horizontal support (3).

6. The temporary support device for bridge jacking construction on soft soil foundation according to claim 1 is characterized in that: The temporary support structure (2) comprises an H-shaped bracket, and a diagonal brace is arranged inside the H-shaped bracket.

7. The temporary support device for bridge jacking construction on soft soil foundation according to claim 6 is characterized in that: The bottom of the H-shaped bracket is welded to the second horizontal support (4).

8. The temporary support device for bridge jacking construction on soft soil foundation according to claim 6 is characterized in that: The bottom of the H-shaped bracket is provided with an ear plate, and the screw passes through the ear plate and the second horizontal support (4) in sequence and cooperates with the nut thread.

9. The temporary support device for bridge jacking construction on soft soil foundation according to claim 1, characterized in that: The lower surface of the second horizontal support (4) is provided with an anti-slip strip.

10. The temporary support device for bridge jacking construction on soft soil foundation according to claim 2, characterized in that: The side surfaces of the support platform (11) are all roughened surfaces.

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